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Linux 4.19.133
[linux/fpc-iii.git] / drivers / s390 / block / dasd_eckd.c
bloba2e34c853ca989240122aee42ad590d79d3c54a6
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23 #include <linux/seq_file.h>
24
25 #include <asm/css_chars.h>
26 #include <asm/debug.h>
27 #include <asm/idals.h>
28 #include <asm/ebcdic.h>
29 #include <asm/io.h>
30 #include <linux/uaccess.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/itcw.h>
34 #include <asm/schid.h>
35 #include <asm/chpid.h>
36
37 #include "dasd_int.h"
38 #include "dasd_eckd.h"
39
40 #ifdef PRINTK_HEADER
41 #undef PRINTK_HEADER
42 #endif /* PRINTK_HEADER */
43 #define PRINTK_HEADER "dasd(eckd):"
44
45 #define ECKD_C0(i) (i->home_bytes)
46 #define ECKD_F(i) (i->formula)
47 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
48 (i->factors.f_0x02.f1))
49 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
50 (i->factors.f_0x02.f2))
51 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
52 (i->factors.f_0x02.f3))
53 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
54 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
55 #define ECKD_F6(i) (i->factor6)
56 #define ECKD_F7(i) (i->factor7)
57 #define ECKD_F8(i) (i->factor8)
58
59 /*
60 * raw track access always map to 64k in memory
61 * so it maps to 16 blocks of 4k per track
62 */
63 #define DASD_RAW_BLOCK_PER_TRACK 16
64 #define DASD_RAW_BLOCKSIZE 4096
65 /* 64k are 128 x 512 byte sectors */
66 #define DASD_RAW_SECTORS_PER_TRACK 128
67
68 MODULE_LICENSE("GPL");
69
70 static struct dasd_discipline dasd_eckd_discipline;
71
72 /* The ccw bus type uses this table to find devices that it sends to
73 * dasd_eckd_probe */
74 static struct ccw_device_id dasd_eckd_ids[] = {
75 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
76 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
77 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
78 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
79 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
80 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
81 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
82 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
83 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
84 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
85 { /* end of list */ },
86 };
87
88 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
89
90 static struct ccw_driver dasd_eckd_driver; /* see below */
91
92 static void *rawpadpage;
93
94 #define INIT_CQR_OK 0
95 #define INIT_CQR_UNFORMATTED 1
96 #define INIT_CQR_ERROR 2
97
98 /* emergency request for reserve/release */
99 static struct {
100 struct dasd_ccw_req cqr;
101 struct ccw1 ccw;
102 char data[32];
103 } *dasd_reserve_req;
104 static DEFINE_MUTEX(dasd_reserve_mutex);
105
106 /* definitions for the path verification worker */
107 struct path_verification_work_data {
108 struct work_struct worker;
109 struct dasd_device *device;
110 struct dasd_ccw_req cqr;
111 struct ccw1 ccw;
112 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
113 int isglobal;
114 __u8 tbvpm;
115 };
116 static struct path_verification_work_data *path_verification_worker;
117 static DEFINE_MUTEX(dasd_path_verification_mutex);
118
119 struct check_attention_work_data {
120 struct work_struct worker;
121 struct dasd_device *device;
122 __u8 lpum;
123 };
124
125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
126 struct dasd_device *, struct dasd_device *,
127 unsigned int, int, unsigned int, unsigned int,
128 unsigned int, unsigned int);
129
130 /* initial attempt at a probe function. this can be simplified once
131 * the other detection code is gone */
132 static int
133 dasd_eckd_probe (struct ccw_device *cdev)
134 {
135 int ret;
136
137 /* set ECKD specific ccw-device options */
138 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
139 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
140 if (ret) {
141 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
142 "dasd_eckd_probe: could not set "
143 "ccw-device options");
144 return ret;
145 }
146 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
147 return ret;
148 }
149
150 static int
151 dasd_eckd_set_online(struct ccw_device *cdev)
152 {
153 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
154 }
155
156 static const int sizes_trk0[] = { 28, 148, 84 };
157 #define LABEL_SIZE 140
158
159 /* head and record addresses of count_area read in analysis ccw */
160 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
162
163 static inline unsigned int
164 round_up_multiple(unsigned int no, unsigned int mult)
165 {
166 int rem = no % mult;
167 return (rem ? no - rem + mult : no);
168 }
169
170 static inline unsigned int
171 ceil_quot(unsigned int d1, unsigned int d2)
172 {
173 return (d1 + (d2 - 1)) / d2;
174 }
175
176 static unsigned int
177 recs_per_track(struct dasd_eckd_characteristics * rdc,
178 unsigned int kl, unsigned int dl)
179 {
180 int dn, kn;
181
182 switch (rdc->dev_type) {
183 case 0x3380:
184 if (kl)
185 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
186 ceil_quot(dl + 12, 32));
187 else
188 return 1499 / (15 + ceil_quot(dl + 12, 32));
189 case 0x3390:
190 dn = ceil_quot(dl + 6, 232) + 1;
191 if (kl) {
192 kn = ceil_quot(kl + 6, 232) + 1;
193 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
194 9 + ceil_quot(dl + 6 * dn, 34));
195 } else
196 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
197 case 0x9345:
198 dn = ceil_quot(dl + 6, 232) + 1;
199 if (kl) {
200 kn = ceil_quot(kl + 6, 232) + 1;
201 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
202 ceil_quot(dl + 6 * dn, 34));
203 } else
204 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
205 }
206 return 0;
207 }
208
209 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
210 {
211 geo->cyl = (__u16) cyl;
212 geo->head = cyl >> 16;
213 geo->head <<= 4;
214 geo->head |= head;
215 }
216
217 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
218 struct dasd_device *device)
219 {
220 struct dasd_eckd_private *private = device->private;
221 int rc;
222
223 rc = get_phys_clock(&data->ep_sys_time);
224 /*
225 * Ignore return code if XRC is not supported or
226 * sync clock is switched off
227 */
228 if ((rc && !private->rdc_data.facilities.XRC_supported) ||
229 rc == -EOPNOTSUPP || rc == -EACCES)
230 return 0;
231
232 /* switch on System Time Stamp - needed for XRC Support */
233 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
234 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
235
236 if (ccw) {
237 ccw->count = sizeof(struct DE_eckd_data);
238 ccw->flags |= CCW_FLAG_SLI;
239 }
240
241 return rc;
242 }
243
244 static int
245 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
246 unsigned int totrk, int cmd, struct dasd_device *device,
247 int blksize)
248 {
249 struct dasd_eckd_private *private = device->private;
250 u16 heads, beghead, endhead;
251 u32 begcyl, endcyl;
252 int rc = 0;
253
254 if (ccw) {
255 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
256 ccw->flags = 0;
257 ccw->count = 16;
258 ccw->cda = (__u32)__pa(data);
259 }
260
261 memset(data, 0, sizeof(struct DE_eckd_data));
262 switch (cmd) {
263 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
264 case DASD_ECKD_CCW_READ_RECORD_ZERO:
265 case DASD_ECKD_CCW_READ:
266 case DASD_ECKD_CCW_READ_MT:
267 case DASD_ECKD_CCW_READ_CKD:
268 case DASD_ECKD_CCW_READ_CKD_MT:
269 case DASD_ECKD_CCW_READ_KD:
270 case DASD_ECKD_CCW_READ_KD_MT:
271 data->mask.perm = 0x1;
272 data->attributes.operation = private->attrib.operation;
273 break;
274 case DASD_ECKD_CCW_READ_COUNT:
275 data->mask.perm = 0x1;
276 data->attributes.operation = DASD_BYPASS_CACHE;
277 break;
278 case DASD_ECKD_CCW_READ_TRACK:
279 case DASD_ECKD_CCW_READ_TRACK_DATA:
280 data->mask.perm = 0x1;
281 data->attributes.operation = private->attrib.operation;
282 data->blk_size = 0;
283 break;
284 case DASD_ECKD_CCW_WRITE:
285 case DASD_ECKD_CCW_WRITE_MT:
286 case DASD_ECKD_CCW_WRITE_KD:
287 case DASD_ECKD_CCW_WRITE_KD_MT:
288 data->mask.perm = 0x02;
289 data->attributes.operation = private->attrib.operation;
290 rc = set_timestamp(ccw, data, device);
291 break;
292 case DASD_ECKD_CCW_WRITE_CKD:
293 case DASD_ECKD_CCW_WRITE_CKD_MT:
294 data->attributes.operation = DASD_BYPASS_CACHE;
295 rc = set_timestamp(ccw, data, device);
296 break;
297 case DASD_ECKD_CCW_ERASE:
298 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
299 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
300 data->mask.perm = 0x3;
301 data->mask.auth = 0x1;
302 data->attributes.operation = DASD_BYPASS_CACHE;
303 rc = set_timestamp(ccw, data, device);
304 break;
305 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
306 data->mask.perm = 0x03;
307 data->attributes.operation = private->attrib.operation;
308 data->blk_size = 0;
309 break;
310 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
311 data->mask.perm = 0x02;
312 data->attributes.operation = private->attrib.operation;
313 data->blk_size = blksize;
314 rc = set_timestamp(ccw, data, device);
315 break;
316 default:
317 dev_err(&device->cdev->dev,
318 "0x%x is not a known command\n", cmd);
319 break;
320 }
321
322 data->attributes.mode = 0x3; /* ECKD */
323
324 if ((private->rdc_data.cu_type == 0x2105 ||
325 private->rdc_data.cu_type == 0x2107 ||
326 private->rdc_data.cu_type == 0x1750)
327 && !(private->uses_cdl && trk < 2))
328 data->ga_extended |= 0x40; /* Regular Data Format Mode */
329
330 heads = private->rdc_data.trk_per_cyl;
331 begcyl = trk / heads;
332 beghead = trk % heads;
333 endcyl = totrk / heads;
334 endhead = totrk % heads;
335
336 /* check for sequential prestage - enhance cylinder range */
337 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
338 data->attributes.operation == DASD_SEQ_ACCESS) {
339
340 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
341 endcyl += private->attrib.nr_cyl;
342 else
343 endcyl = (private->real_cyl - 1);
344 }
345
346 set_ch_t(&data->beg_ext, begcyl, beghead);
347 set_ch_t(&data->end_ext, endcyl, endhead);
348 return rc;
349 }
350
351
352 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
353 unsigned int trk, unsigned int rec_on_trk,
354 int count, int cmd, struct dasd_device *device,
355 unsigned int reclen, unsigned int tlf)
356 {
357 struct dasd_eckd_private *private = device->private;
358 int sector;
359 int dn, d;
360
361 if (ccw) {
362 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
363 ccw->flags = 0;
364 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
365 ccw->count = 22;
366 else
367 ccw->count = 20;
368 ccw->cda = (__u32)__pa(data);
369 }
370
371 memset(data, 0, sizeof(*data));
372 sector = 0;
373 if (rec_on_trk) {
374 switch (private->rdc_data.dev_type) {
375 case 0x3390:
376 dn = ceil_quot(reclen + 6, 232);
377 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
378 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
379 break;
380 case 0x3380:
381 d = 7 + ceil_quot(reclen + 12, 32);
382 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
383 break;
384 }
385 }
386 data->sector = sector;
387 /* note: meaning of count depends on the operation
388 * for record based I/O it's the number of records, but for
389 * track based I/O it's the number of tracks
390 */
391 data->count = count;
392 switch (cmd) {
393 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
394 data->operation.orientation = 0x3;
395 data->operation.operation = 0x03;
396 break;
397 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
398 data->operation.orientation = 0x3;
399 data->operation.operation = 0x16;
400 break;
401 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
402 data->operation.orientation = 0x1;
403 data->operation.operation = 0x03;
404 data->count++;
405 break;
406 case DASD_ECKD_CCW_READ_RECORD_ZERO:
407 data->operation.orientation = 0x3;
408 data->operation.operation = 0x16;
409 data->count++;
410 break;
411 case DASD_ECKD_CCW_WRITE:
412 case DASD_ECKD_CCW_WRITE_MT:
413 case DASD_ECKD_CCW_WRITE_KD:
414 case DASD_ECKD_CCW_WRITE_KD_MT:
415 data->auxiliary.length_valid = 0x1;
416 data->length = reclen;
417 data->operation.operation = 0x01;
418 break;
419 case DASD_ECKD_CCW_WRITE_CKD:
420 case DASD_ECKD_CCW_WRITE_CKD_MT:
421 data->auxiliary.length_valid = 0x1;
422 data->length = reclen;
423 data->operation.operation = 0x03;
424 break;
425 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
426 data->operation.orientation = 0x0;
427 data->operation.operation = 0x3F;
428 data->extended_operation = 0x11;
429 data->length = 0;
430 data->extended_parameter_length = 0x02;
431 if (data->count > 8) {
432 data->extended_parameter[0] = 0xFF;
433 data->extended_parameter[1] = 0xFF;
434 data->extended_parameter[1] <<= (16 - count);
435 } else {
436 data->extended_parameter[0] = 0xFF;
437 data->extended_parameter[0] <<= (8 - count);
438 data->extended_parameter[1] = 0x00;
439 }
440 data->sector = 0xFF;
441 break;
442 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
443 data->auxiliary.length_valid = 0x1;
444 data->length = reclen; /* not tlf, as one might think */
445 data->operation.operation = 0x3F;
446 data->extended_operation = 0x23;
447 break;
448 case DASD_ECKD_CCW_READ:
449 case DASD_ECKD_CCW_READ_MT:
450 case DASD_ECKD_CCW_READ_KD:
451 case DASD_ECKD_CCW_READ_KD_MT:
452 data->auxiliary.length_valid = 0x1;
453 data->length = reclen;
454 data->operation.operation = 0x06;
455 break;
456 case DASD_ECKD_CCW_READ_CKD:
457 case DASD_ECKD_CCW_READ_CKD_MT:
458 data->auxiliary.length_valid = 0x1;
459 data->length = reclen;
460 data->operation.operation = 0x16;
461 break;
462 case DASD_ECKD_CCW_READ_COUNT:
463 data->operation.operation = 0x06;
464 break;
465 case DASD_ECKD_CCW_READ_TRACK:
466 data->operation.orientation = 0x1;
467 data->operation.operation = 0x0C;
468 data->extended_parameter_length = 0;
469 data->sector = 0xFF;
470 break;
471 case DASD_ECKD_CCW_READ_TRACK_DATA:
472 data->auxiliary.length_valid = 0x1;
473 data->length = tlf;
474 data->operation.operation = 0x0C;
475 break;
476 case DASD_ECKD_CCW_ERASE:
477 data->length = reclen;
478 data->auxiliary.length_valid = 0x1;
479 data->operation.operation = 0x0b;
480 break;
481 default:
482 DBF_DEV_EVENT(DBF_ERR, device,
483 "fill LRE unknown opcode 0x%x", cmd);
484 BUG();
485 }
486 set_ch_t(&data->seek_addr,
487 trk / private->rdc_data.trk_per_cyl,
488 trk % private->rdc_data.trk_per_cyl);
489 data->search_arg.cyl = data->seek_addr.cyl;
490 data->search_arg.head = data->seek_addr.head;
491 data->search_arg.record = rec_on_trk;
492 }
493
494 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
495 unsigned int trk, unsigned int totrk, int cmd,
496 struct dasd_device *basedev, struct dasd_device *startdev,
497 unsigned int format, unsigned int rec_on_trk, int count,
498 unsigned int blksize, unsigned int tlf)
499 {
500 struct dasd_eckd_private *basepriv, *startpriv;
501 struct LRE_eckd_data *lredata;
502 struct DE_eckd_data *dedata;
503 int rc = 0;
504
505 basepriv = basedev->private;
506 startpriv = startdev->private;
507 dedata = &pfxdata->define_extent;
508 lredata = &pfxdata->locate_record;
509
510 ccw->cmd_code = DASD_ECKD_CCW_PFX;
511 ccw->flags = 0;
512 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
513 ccw->count = sizeof(*pfxdata) + 2;
514 ccw->cda = (__u32) __pa(pfxdata);
515 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
516 } else {
517 ccw->count = sizeof(*pfxdata);
518 ccw->cda = (__u32) __pa(pfxdata);
519 memset(pfxdata, 0, sizeof(*pfxdata));
520 }
521
522 /* prefix data */
523 if (format > 1) {
524 DBF_DEV_EVENT(DBF_ERR, basedev,
525 "PFX LRE unknown format 0x%x", format);
526 BUG();
527 return -EINVAL;
528 }
529 pfxdata->format = format;
530 pfxdata->base_address = basepriv->ned->unit_addr;
531 pfxdata->base_lss = basepriv->ned->ID;
532 pfxdata->validity.define_extent = 1;
533
534 /* private uid is kept up to date, conf_data may be outdated */
535 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
536 pfxdata->validity.verify_base = 1;
537
538 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
539 pfxdata->validity.verify_base = 1;
540 pfxdata->validity.hyper_pav = 1;
541 }
542
543 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
544
545 /*
546 * For some commands the System Time Stamp is set in the define extent
547 * data when XRC is supported. The validity of the time stamp must be
548 * reflected in the prefix data as well.
549 */
550 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
551 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
552
553 if (format == 1) {
554 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
555 basedev, blksize, tlf);
556 }
557
558 return rc;
559 }
560
561 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
562 unsigned int trk, unsigned int totrk, int cmd,
563 struct dasd_device *basedev, struct dasd_device *startdev)
564 {
565 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
566 0, 0, 0, 0, 0);
567 }
568
569 static void
570 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
571 unsigned int rec_on_trk, int no_rec, int cmd,
572 struct dasd_device * device, int reclen)
573 {
574 struct dasd_eckd_private *private = device->private;
575 int sector;
576 int dn, d;
577
578 DBF_DEV_EVENT(DBF_INFO, device,
579 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
580 trk, rec_on_trk, no_rec, cmd, reclen);
581
582 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
583 ccw->flags = 0;
584 ccw->count = 16;
585 ccw->cda = (__u32) __pa(data);
586
587 memset(data, 0, sizeof(struct LO_eckd_data));
588 sector = 0;
589 if (rec_on_trk) {
590 switch (private->rdc_data.dev_type) {
591 case 0x3390:
592 dn = ceil_quot(reclen + 6, 232);
593 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
594 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
595 break;
596 case 0x3380:
597 d = 7 + ceil_quot(reclen + 12, 32);
598 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
599 break;
600 }
601 }
602 data->sector = sector;
603 data->count = no_rec;
604 switch (cmd) {
605 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
606 data->operation.orientation = 0x3;
607 data->operation.operation = 0x03;
608 break;
609 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
610 data->operation.orientation = 0x3;
611 data->operation.operation = 0x16;
612 break;
613 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
614 data->operation.orientation = 0x1;
615 data->operation.operation = 0x03;
616 data->count++;
617 break;
618 case DASD_ECKD_CCW_READ_RECORD_ZERO:
619 data->operation.orientation = 0x3;
620 data->operation.operation = 0x16;
621 data->count++;
622 break;
623 case DASD_ECKD_CCW_WRITE:
624 case DASD_ECKD_CCW_WRITE_MT:
625 case DASD_ECKD_CCW_WRITE_KD:
626 case DASD_ECKD_CCW_WRITE_KD_MT:
627 data->auxiliary.last_bytes_used = 0x1;
628 data->length = reclen;
629 data->operation.operation = 0x01;
630 break;
631 case DASD_ECKD_CCW_WRITE_CKD:
632 case DASD_ECKD_CCW_WRITE_CKD_MT:
633 data->auxiliary.last_bytes_used = 0x1;
634 data->length = reclen;
635 data->operation.operation = 0x03;
636 break;
637 case DASD_ECKD_CCW_READ:
638 case DASD_ECKD_CCW_READ_MT:
639 case DASD_ECKD_CCW_READ_KD:
640 case DASD_ECKD_CCW_READ_KD_MT:
641 data->auxiliary.last_bytes_used = 0x1;
642 data->length = reclen;
643 data->operation.operation = 0x06;
644 break;
645 case DASD_ECKD_CCW_READ_CKD:
646 case DASD_ECKD_CCW_READ_CKD_MT:
647 data->auxiliary.last_bytes_used = 0x1;
648 data->length = reclen;
649 data->operation.operation = 0x16;
650 break;
651 case DASD_ECKD_CCW_READ_COUNT:
652 data->operation.operation = 0x06;
653 break;
654 case DASD_ECKD_CCW_ERASE:
655 data->length = reclen;
656 data->auxiliary.last_bytes_used = 0x1;
657 data->operation.operation = 0x0b;
658 break;
659 default:
660 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
661 "opcode 0x%x", cmd);
662 }
663 set_ch_t(&data->seek_addr,
664 trk / private->rdc_data.trk_per_cyl,
665 trk % private->rdc_data.trk_per_cyl);
666 data->search_arg.cyl = data->seek_addr.cyl;
667 data->search_arg.head = data->seek_addr.head;
668 data->search_arg.record = rec_on_trk;
669 }
670
671 /*
672 * Returns 1 if the block is one of the special blocks that needs
673 * to get read/written with the KD variant of the command.
674 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
675 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
676 * Luckily the KD variants differ only by one bit (0x08) from the
677 * normal variant. So don't wonder about code like:
678 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
679 * ccw->cmd_code |= 0x8;
680 */
681 static inline int
682 dasd_eckd_cdl_special(int blk_per_trk, int recid)
683 {
684 if (recid < 3)
685 return 1;
686 if (recid < blk_per_trk)
687 return 0;
688 if (recid < 2 * blk_per_trk)
689 return 1;
690 return 0;
691 }
692
693 /*
694 * Returns the record size for the special blocks of the cdl format.
695 * Only returns something useful if dasd_eckd_cdl_special is true
696 * for the recid.
697 */
698 static inline int
699 dasd_eckd_cdl_reclen(int recid)
700 {
701 if (recid < 3)
702 return sizes_trk0[recid];
703 return LABEL_SIZE;
704 }
705 /* create unique id from private structure. */
706 static void create_uid(struct dasd_eckd_private *private)
707 {
708 int count;
709 struct dasd_uid *uid;
710
711 uid = &private->uid;
712 memset(uid, 0, sizeof(struct dasd_uid));
713 memcpy(uid->vendor, private->ned->HDA_manufacturer,
714 sizeof(uid->vendor) - 1);
715 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
716 memcpy(uid->serial, private->ned->HDA_location,
717 sizeof(uid->serial) - 1);
718 EBCASC(uid->serial, sizeof(uid->serial) - 1);
719 uid->ssid = private->gneq->subsystemID;
720 uid->real_unit_addr = private->ned->unit_addr;
721 if (private->sneq) {
722 uid->type = private->sneq->sua_flags;
723 if (uid->type == UA_BASE_PAV_ALIAS)
724 uid->base_unit_addr = private->sneq->base_unit_addr;
725 } else {
726 uid->type = UA_BASE_DEVICE;
727 }
728 if (private->vdsneq) {
729 for (count = 0; count < 16; count++) {
730 sprintf(uid->vduit+2*count, "%02x",
731 private->vdsneq->uit[count]);
732 }
733 }
734 }
735
736 /*
737 * Generate device unique id that specifies the physical device.
738 */
739 static int dasd_eckd_generate_uid(struct dasd_device *device)
740 {
741 struct dasd_eckd_private *private = device->private;
742 unsigned long flags;
743
744 if (!private)
745 return -ENODEV;
746 if (!private->ned || !private->gneq)
747 return -ENODEV;
748 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
749 create_uid(private);
750 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
751 return 0;
752 }
753
754 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
755 {
756 struct dasd_eckd_private *private = device->private;
757 unsigned long flags;
758
759 if (private) {
760 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
761 *uid = private->uid;
762 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
763 return 0;
764 }
765 return -EINVAL;
766 }
767
768 /*
769 * compare device UID with data of a given dasd_eckd_private structure
770 * return 0 for match
771 */
772 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
773 struct dasd_eckd_private *private)
774 {
775 struct dasd_uid device_uid;
776
777 create_uid(private);
778 dasd_eckd_get_uid(device, &device_uid);
779
780 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
781 }
782
783 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
784 struct dasd_ccw_req *cqr,
785 __u8 *rcd_buffer,
786 __u8 lpm)
787 {
788 struct ccw1 *ccw;
789 /*
790 * buffer has to start with EBCDIC "V1.0" to show
791 * support for virtual device SNEQ
792 */
793 rcd_buffer[0] = 0xE5;
794 rcd_buffer[1] = 0xF1;
795 rcd_buffer[2] = 0x4B;
796 rcd_buffer[3] = 0xF0;
797
798 ccw = cqr->cpaddr;
799 ccw->cmd_code = DASD_ECKD_CCW_RCD;
800 ccw->flags = 0;
801 ccw->cda = (__u32)(addr_t)rcd_buffer;
802 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
803 cqr->magic = DASD_ECKD_MAGIC;
804
805 cqr->startdev = device;
806 cqr->memdev = device;
807 cqr->block = NULL;
808 cqr->expires = 10*HZ;
809 cqr->lpm = lpm;
810 cqr->retries = 256;
811 cqr->buildclk = get_tod_clock();
812 cqr->status = DASD_CQR_FILLED;
813 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
814 }
815
816 /*
817 * Wakeup helper for read_conf
818 * if the cqr is not done and needs some error recovery
819 * the buffer has to be re-initialized with the EBCDIC "V1.0"
820 * to show support for virtual device SNEQ
821 */
822 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
823 {
824 struct ccw1 *ccw;
825 __u8 *rcd_buffer;
826
827 if (cqr->status != DASD_CQR_DONE) {
828 ccw = cqr->cpaddr;
829 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
830 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
831
832 rcd_buffer[0] = 0xE5;
833 rcd_buffer[1] = 0xF1;
834 rcd_buffer[2] = 0x4B;
835 rcd_buffer[3] = 0xF0;
836 }
837 dasd_wakeup_cb(cqr, data);
838 }
839
840 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
841 struct dasd_ccw_req *cqr,
842 __u8 *rcd_buffer,
843 __u8 lpm)
844 {
845 struct ciw *ciw;
846 int rc;
847 /*
848 * sanity check: scan for RCD command in extended SenseID data
849 * some devices do not support RCD
850 */
851 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
852 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
853 return -EOPNOTSUPP;
854
855 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
856 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
857 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
858 cqr->retries = 5;
859 cqr->callback = read_conf_cb;
860 rc = dasd_sleep_on_immediatly(cqr);
861 return rc;
862 }
863
864 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
865 void **rcd_buffer,
866 int *rcd_buffer_size, __u8 lpm)
867 {
868 struct ciw *ciw;
869 char *rcd_buf = NULL;
870 int ret;
871 struct dasd_ccw_req *cqr;
872
873 /*
874 * sanity check: scan for RCD command in extended SenseID data
875 * some devices do not support RCD
876 */
877 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
878 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
879 ret = -EOPNOTSUPP;
880 goto out_error;
881 }
882 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
883 if (!rcd_buf) {
884 ret = -ENOMEM;
885 goto out_error;
886 }
887 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
888 0, /* use rcd_buf as data ara */
889 device, NULL);
890 if (IS_ERR(cqr)) {
891 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
892 "Could not allocate RCD request");
893 ret = -ENOMEM;
894 goto out_error;
895 }
896 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
897 cqr->callback = read_conf_cb;
898 ret = dasd_sleep_on(cqr);
899 /*
900 * on success we update the user input parms
901 */
902 dasd_sfree_request(cqr, cqr->memdev);
903 if (ret)
904 goto out_error;
905
906 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
907 *rcd_buffer = rcd_buf;
908 return 0;
909 out_error:
910 kfree(rcd_buf);
911 *rcd_buffer = NULL;
912 *rcd_buffer_size = 0;
913 return ret;
914 }
915
916 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
917 {
918
919 struct dasd_sneq *sneq;
920 int i, count;
921
922 private->ned = NULL;
923 private->sneq = NULL;
924 private->vdsneq = NULL;
925 private->gneq = NULL;
926 count = private->conf_len / sizeof(struct dasd_sneq);
927 sneq = (struct dasd_sneq *)private->conf_data;
928 for (i = 0; i < count; ++i) {
929 if (sneq->flags.identifier == 1 && sneq->format == 1)
930 private->sneq = sneq;
931 else if (sneq->flags.identifier == 1 && sneq->format == 4)
932 private->vdsneq = (struct vd_sneq *)sneq;
933 else if (sneq->flags.identifier == 2)
934 private->gneq = (struct dasd_gneq *)sneq;
935 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
936 private->ned = (struct dasd_ned *)sneq;
937 sneq++;
938 }
939 if (!private->ned || !private->gneq) {
940 private->ned = NULL;
941 private->sneq = NULL;
942 private->vdsneq = NULL;
943 private->gneq = NULL;
944 return -EINVAL;
945 }
946 return 0;
947
948 };
949
950 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
951 {
952 struct dasd_gneq *gneq;
953 int i, count, found;
954
955 count = conf_len / sizeof(*gneq);
956 gneq = (struct dasd_gneq *)conf_data;
957 found = 0;
958 for (i = 0; i < count; ++i) {
959 if (gneq->flags.identifier == 2) {
960 found = 1;
961 break;
962 }
963 gneq++;
964 }
965 if (found)
966 return ((char *)gneq)[18] & 0x07;
967 else
968 return 0;
969 }
970
971 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
972 {
973 struct dasd_eckd_private *private = device->private;
974 int i;
975
976 private->conf_data = NULL;
977 private->conf_len = 0;
978 for (i = 0; i < 8; i++) {
979 kfree(device->path[i].conf_data);
980 device->path[i].conf_data = NULL;
981 device->path[i].cssid = 0;
982 device->path[i].ssid = 0;
983 device->path[i].chpid = 0;
984 }
985 }
986
987
988 static int dasd_eckd_read_conf(struct dasd_device *device)
989 {
990 void *conf_data;
991 int conf_len, conf_data_saved;
992 int rc, path_err, pos;
993 __u8 lpm, opm;
994 struct dasd_eckd_private *private, path_private;
995 struct dasd_uid *uid;
996 char print_path_uid[60], print_device_uid[60];
997 struct channel_path_desc_fmt0 *chp_desc;
998 struct subchannel_id sch_id;
999
1000 private = device->private;
1001 opm = ccw_device_get_path_mask(device->cdev);
1002 ccw_device_get_schid(device->cdev, &sch_id);
1003 conf_data_saved = 0;
1004 path_err = 0;
1005 /* get configuration data per operational path */
1006 for (lpm = 0x80; lpm; lpm>>= 1) {
1007 if (!(lpm & opm))
1008 continue;
1009 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1010 &conf_len, lpm);
1011 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1012 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1013 "Read configuration data returned "
1014 "error %d", rc);
1015 return rc;
1016 }
1017 if (conf_data == NULL) {
1018 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1019 "No configuration data "
1020 "retrieved");
1021 /* no further analysis possible */
1022 dasd_path_add_opm(device, opm);
1023 continue; /* no error */
1024 }
1025 /* save first valid configuration data */
1026 if (!conf_data_saved) {
1027 /* initially clear previously stored conf_data */
1028 dasd_eckd_clear_conf_data(device);
1029 private->conf_data = conf_data;
1030 private->conf_len = conf_len;
1031 if (dasd_eckd_identify_conf_parts(private)) {
1032 private->conf_data = NULL;
1033 private->conf_len = 0;
1034 kfree(conf_data);
1035 continue;
1036 }
1037 pos = pathmask_to_pos(lpm);
1038 /* store per path conf_data */
1039 device->path[pos].conf_data = conf_data;
1040 device->path[pos].cssid = sch_id.cssid;
1041 device->path[pos].ssid = sch_id.ssid;
1042 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1043 if (chp_desc)
1044 device->path[pos].chpid = chp_desc->chpid;
1045 kfree(chp_desc);
1046 /*
1047 * build device UID that other path data
1048 * can be compared to it
1049 */
1050 dasd_eckd_generate_uid(device);
1051 conf_data_saved++;
1052 } else {
1053 path_private.conf_data = conf_data;
1054 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1055 if (dasd_eckd_identify_conf_parts(
1056 &path_private)) {
1057 path_private.conf_data = NULL;
1058 path_private.conf_len = 0;
1059 kfree(conf_data);
1060 continue;
1061 }
1062 if (dasd_eckd_compare_path_uid(
1063 device, &path_private)) {
1064 uid = &path_private.uid;
1065 if (strlen(uid->vduit) > 0)
1066 snprintf(print_path_uid,
1067 sizeof(print_path_uid),
1068 "%s.%s.%04x.%02x.%s",
1069 uid->vendor, uid->serial,
1070 uid->ssid, uid->real_unit_addr,
1071 uid->vduit);
1072 else
1073 snprintf(print_path_uid,
1074 sizeof(print_path_uid),
1075 "%s.%s.%04x.%02x",
1076 uid->vendor, uid->serial,
1077 uid->ssid,
1078 uid->real_unit_addr);
1079 uid = &private->uid;
1080 if (strlen(uid->vduit) > 0)
1081 snprintf(print_device_uid,
1082 sizeof(print_device_uid),
1083 "%s.%s.%04x.%02x.%s",
1084 uid->vendor, uid->serial,
1085 uid->ssid, uid->real_unit_addr,
1086 uid->vduit);
1087 else
1088 snprintf(print_device_uid,
1089 sizeof(print_device_uid),
1090 "%s.%s.%04x.%02x",
1091 uid->vendor, uid->serial,
1092 uid->ssid,
1093 uid->real_unit_addr);
1094 dev_err(&device->cdev->dev,
1095 "Not all channel paths lead to "
1096 "the same device, path %02X leads to "
1097 "device %s instead of %s\n", lpm,
1098 print_path_uid, print_device_uid);
1099 path_err = -EINVAL;
1100 dasd_path_add_cablepm(device, lpm);
1101 continue;
1102 }
1103 pos = pathmask_to_pos(lpm);
1104 /* store per path conf_data */
1105 device->path[pos].conf_data = conf_data;
1106 device->path[pos].cssid = sch_id.cssid;
1107 device->path[pos].ssid = sch_id.ssid;
1108 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1109 if (chp_desc)
1110 device->path[pos].chpid = chp_desc->chpid;
1111 kfree(chp_desc);
1112 path_private.conf_data = NULL;
1113 path_private.conf_len = 0;
1114 }
1115 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1116 case 0x02:
1117 dasd_path_add_nppm(device, lpm);
1118 break;
1119 case 0x03:
1120 dasd_path_add_ppm(device, lpm);
1121 break;
1122 }
1123 if (!dasd_path_get_opm(device)) {
1124 dasd_path_set_opm(device, lpm);
1125 dasd_generic_path_operational(device);
1126 } else {
1127 dasd_path_add_opm(device, lpm);
1128 }
1129 }
1130
1131 return path_err;
1132 }
1133
1134 static u32 get_fcx_max_data(struct dasd_device *device)
1135 {
1136 struct dasd_eckd_private *private = device->private;
1137 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1138 unsigned int mdc;
1139 int tpm;
1140
1141 if (dasd_nofcx)
1142 return 0;
1143 /* is transport mode supported? */
1144 fcx_in_css = css_general_characteristics.fcx;
1145 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1146 fcx_in_features = private->features.feature[40] & 0x80;
1147 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1148
1149 if (!tpm)
1150 return 0;
1151
1152 mdc = ccw_device_get_mdc(device->cdev, 0);
1153 if (mdc == 0) {
1154 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1155 return 0;
1156 } else {
1157 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1158 }
1159 }
1160
1161 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1162 {
1163 struct dasd_eckd_private *private = device->private;
1164 unsigned int mdc;
1165 u32 fcx_max_data;
1166
1167 if (private->fcx_max_data) {
1168 mdc = ccw_device_get_mdc(device->cdev, lpm);
1169 if (mdc == 0) {
1170 dev_warn(&device->cdev->dev,
1171 "Detecting the maximum data size for zHPF "
1172 "requests failed (rc=%d) for a new path %x\n",
1173 mdc, lpm);
1174 return mdc;
1175 }
1176 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1177 if (fcx_max_data < private->fcx_max_data) {
1178 dev_warn(&device->cdev->dev,
1179 "The maximum data size for zHPF requests %u "
1180 "on a new path %x is below the active maximum "
1181 "%u\n", fcx_max_data, lpm,
1182 private->fcx_max_data);
1183 return -EACCES;
1184 }
1185 }
1186 return 0;
1187 }
1188
1189 static int rebuild_device_uid(struct dasd_device *device,
1190 struct path_verification_work_data *data)
1191 {
1192 struct dasd_eckd_private *private = device->private;
1193 __u8 lpm, opm = dasd_path_get_opm(device);
1194 int rc = -ENODEV;
1195
1196 for (lpm = 0x80; lpm; lpm >>= 1) {
1197 if (!(lpm & opm))
1198 continue;
1199 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1200 memset(&data->cqr, 0, sizeof(data->cqr));
1201 data->cqr.cpaddr = &data->ccw;
1202 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1203 data->rcd_buffer,
1204 lpm);
1205
1206 if (rc) {
1207 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1208 continue;
1209 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1210 "Read configuration data "
1211 "returned error %d", rc);
1212 break;
1213 }
1214 memcpy(private->conf_data, data->rcd_buffer,
1215 DASD_ECKD_RCD_DATA_SIZE);
1216 if (dasd_eckd_identify_conf_parts(private)) {
1217 rc = -ENODEV;
1218 } else /* first valid path is enough */
1219 break;
1220 }
1221
1222 if (!rc)
1223 rc = dasd_eckd_generate_uid(device);
1224
1225 return rc;
1226 }
1227
1228 static void do_path_verification_work(struct work_struct *work)
1229 {
1230 struct path_verification_work_data *data;
1231 struct dasd_device *device;
1232 struct dasd_eckd_private path_private;
1233 struct dasd_uid *uid;
1234 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1235 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1236 unsigned long flags;
1237 char print_uid[60];
1238 int rc;
1239
1240 data = container_of(work, struct path_verification_work_data, worker);
1241 device = data->device;
1242
1243 /* delay path verification until device was resumed */
1244 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1245 schedule_work(work);
1246 return;
1247 }
1248 /* check if path verification already running and delay if so */
1249 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1250 schedule_work(work);
1251 return;
1252 }
1253 opm = 0;
1254 npm = 0;
1255 ppm = 0;
1256 epm = 0;
1257 hpfpm = 0;
1258 cablepm = 0;
1259
1260 for (lpm = 0x80; lpm; lpm >>= 1) {
1261 if (!(lpm & data->tbvpm))
1262 continue;
1263 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1264 memset(&data->cqr, 0, sizeof(data->cqr));
1265 data->cqr.cpaddr = &data->ccw;
1266 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1267 data->rcd_buffer,
1268 lpm);
1269 if (!rc) {
1270 switch (dasd_eckd_path_access(data->rcd_buffer,
1271 DASD_ECKD_RCD_DATA_SIZE)
1272 ) {
1273 case 0x02:
1274 npm |= lpm;
1275 break;
1276 case 0x03:
1277 ppm |= lpm;
1278 break;
1279 }
1280 opm |= lpm;
1281 } else if (rc == -EOPNOTSUPP) {
1282 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1283 "path verification: No configuration "
1284 "data retrieved");
1285 opm |= lpm;
1286 } else if (rc == -EAGAIN) {
1287 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1288 "path verification: device is stopped,"
1289 " try again later");
1290 epm |= lpm;
1291 } else {
1292 dev_warn(&device->cdev->dev,
1293 "Reading device feature codes failed "
1294 "(rc=%d) for new path %x\n", rc, lpm);
1295 continue;
1296 }
1297 if (verify_fcx_max_data(device, lpm)) {
1298 opm &= ~lpm;
1299 npm &= ~lpm;
1300 ppm &= ~lpm;
1301 hpfpm |= lpm;
1302 continue;
1303 }
1304
1305 /*
1306 * save conf_data for comparison after
1307 * rebuild_device_uid may have changed
1308 * the original data
1309 */
1310 memcpy(&path_rcd_buf, data->rcd_buffer,
1311 DASD_ECKD_RCD_DATA_SIZE);
1312 path_private.conf_data = (void *) &path_rcd_buf;
1313 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1314 if (dasd_eckd_identify_conf_parts(&path_private)) {
1315 path_private.conf_data = NULL;
1316 path_private.conf_len = 0;
1317 continue;
1318 }
1319
1320 /*
1321 * compare path UID with device UID only if at least
1322 * one valid path is left
1323 * in other case the device UID may have changed and
1324 * the first working path UID will be used as device UID
1325 */
1326 if (dasd_path_get_opm(device) &&
1327 dasd_eckd_compare_path_uid(device, &path_private)) {
1328 /*
1329 * the comparison was not successful
1330 * rebuild the device UID with at least one
1331 * known path in case a z/VM hyperswap command
1332 * has changed the device
1333 *
1334 * after this compare again
1335 *
1336 * if either the rebuild or the recompare fails
1337 * the path can not be used
1338 */
1339 if (rebuild_device_uid(device, data) ||
1340 dasd_eckd_compare_path_uid(
1341 device, &path_private)) {
1342 uid = &path_private.uid;
1343 if (strlen(uid->vduit) > 0)
1344 snprintf(print_uid, sizeof(print_uid),
1345 "%s.%s.%04x.%02x.%s",
1346 uid->vendor, uid->serial,
1347 uid->ssid, uid->real_unit_addr,
1348 uid->vduit);
1349 else
1350 snprintf(print_uid, sizeof(print_uid),
1351 "%s.%s.%04x.%02x",
1352 uid->vendor, uid->serial,
1353 uid->ssid,
1354 uid->real_unit_addr);
1355 dev_err(&device->cdev->dev,
1356 "The newly added channel path %02X "
1357 "will not be used because it leads "
1358 "to a different device %s\n",
1359 lpm, print_uid);
1360 opm &= ~lpm;
1361 npm &= ~lpm;
1362 ppm &= ~lpm;
1363 cablepm |= lpm;
1364 continue;
1365 }
1366 }
1367
1368 /*
1369 * There is a small chance that a path is lost again between
1370 * above path verification and the following modification of
1371 * the device opm mask. We could avoid that race here by using
1372 * yet another path mask, but we rather deal with this unlikely
1373 * situation in dasd_start_IO.
1374 */
1375 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1376 if (!dasd_path_get_opm(device) && opm) {
1377 dasd_path_set_opm(device, opm);
1378 dasd_generic_path_operational(device);
1379 } else {
1380 dasd_path_add_opm(device, opm);
1381 }
1382 dasd_path_add_nppm(device, npm);
1383 dasd_path_add_ppm(device, ppm);
1384 dasd_path_add_tbvpm(device, epm);
1385 dasd_path_add_cablepm(device, cablepm);
1386 dasd_path_add_nohpfpm(device, hpfpm);
1387 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1388 }
1389 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1390 dasd_put_device(device);
1391 if (data->isglobal)
1392 mutex_unlock(&dasd_path_verification_mutex);
1393 else
1394 kfree(data);
1395 }
1396
1397 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1398 {
1399 struct path_verification_work_data *data;
1400
1401 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1402 if (!data) {
1403 if (mutex_trylock(&dasd_path_verification_mutex)) {
1404 data = path_verification_worker;
1405 data->isglobal = 1;
1406 } else
1407 return -ENOMEM;
1408 } else {
1409 memset(data, 0, sizeof(*data));
1410 data->isglobal = 0;
1411 }
1412 INIT_WORK(&data->worker, do_path_verification_work);
1413 dasd_get_device(device);
1414 data->device = device;
1415 data->tbvpm = lpm;
1416 schedule_work(&data->worker);
1417 return 0;
1418 }
1419
1420 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1421 {
1422 struct dasd_eckd_private *private = device->private;
1423 unsigned long flags;
1424
1425 if (!private->fcx_max_data)
1426 private->fcx_max_data = get_fcx_max_data(device);
1427 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1428 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1429 dasd_schedule_device_bh(device);
1430 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1431 }
1432
1433 static int dasd_eckd_read_features(struct dasd_device *device)
1434 {
1435 struct dasd_eckd_private *private = device->private;
1436 struct dasd_psf_prssd_data *prssdp;
1437 struct dasd_rssd_features *features;
1438 struct dasd_ccw_req *cqr;
1439 struct ccw1 *ccw;
1440 int rc;
1441
1442 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1443 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1444 (sizeof(struct dasd_psf_prssd_data) +
1445 sizeof(struct dasd_rssd_features)),
1446 device, NULL);
1447 if (IS_ERR(cqr)) {
1448 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1449 "allocate initialization request");
1450 return PTR_ERR(cqr);
1451 }
1452 cqr->startdev = device;
1453 cqr->memdev = device;
1454 cqr->block = NULL;
1455 cqr->retries = 256;
1456 cqr->expires = 10 * HZ;
1457
1458 /* Prepare for Read Subsystem Data */
1459 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1460 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1461 prssdp->order = PSF_ORDER_PRSSD;
1462 prssdp->suborder = 0x41; /* Read Feature Codes */
1463 /* all other bytes of prssdp must be zero */
1464
1465 ccw = cqr->cpaddr;
1466 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1467 ccw->count = sizeof(struct dasd_psf_prssd_data);
1468 ccw->flags |= CCW_FLAG_CC;
1469 ccw->cda = (__u32)(addr_t) prssdp;
1470
1471 /* Read Subsystem Data - feature codes */
1472 features = (struct dasd_rssd_features *) (prssdp + 1);
1473 memset(features, 0, sizeof(struct dasd_rssd_features));
1474
1475 ccw++;
1476 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1477 ccw->count = sizeof(struct dasd_rssd_features);
1478 ccw->cda = (__u32)(addr_t) features;
1479
1480 cqr->buildclk = get_tod_clock();
1481 cqr->status = DASD_CQR_FILLED;
1482 rc = dasd_sleep_on(cqr);
1483 if (rc == 0) {
1484 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1485 features = (struct dasd_rssd_features *) (prssdp + 1);
1486 memcpy(&private->features, features,
1487 sizeof(struct dasd_rssd_features));
1488 } else
1489 dev_warn(&device->cdev->dev, "Reading device feature codes"
1490 " failed with rc=%d\n", rc);
1491 dasd_sfree_request(cqr, cqr->memdev);
1492 return rc;
1493 }
1494
1495
1496 /*
1497 * Build CP for Perform Subsystem Function - SSC.
1498 */
1499 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1500 int enable_pav)
1501 {
1502 struct dasd_ccw_req *cqr;
1503 struct dasd_psf_ssc_data *psf_ssc_data;
1504 struct ccw1 *ccw;
1505
1506 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1507 sizeof(struct dasd_psf_ssc_data),
1508 device, NULL);
1509
1510 if (IS_ERR(cqr)) {
1511 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1512 "Could not allocate PSF-SSC request");
1513 return cqr;
1514 }
1515 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1516 psf_ssc_data->order = PSF_ORDER_SSC;
1517 psf_ssc_data->suborder = 0xc0;
1518 if (enable_pav) {
1519 psf_ssc_data->suborder |= 0x08;
1520 psf_ssc_data->reserved[0] = 0x88;
1521 }
1522 ccw = cqr->cpaddr;
1523 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1524 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1525 ccw->count = 66;
1526
1527 cqr->startdev = device;
1528 cqr->memdev = device;
1529 cqr->block = NULL;
1530 cqr->retries = 256;
1531 cqr->expires = 10*HZ;
1532 cqr->buildclk = get_tod_clock();
1533 cqr->status = DASD_CQR_FILLED;
1534 return cqr;
1535 }
1536
1537 /*
1538 * Perform Subsystem Function.
1539 * It is necessary to trigger CIO for channel revalidation since this
1540 * call might change behaviour of DASD devices.
1541 */
1542 static int
1543 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1544 unsigned long flags)
1545 {
1546 struct dasd_ccw_req *cqr;
1547 int rc;
1548
1549 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1550 if (IS_ERR(cqr))
1551 return PTR_ERR(cqr);
1552
1553 /*
1554 * set flags e.g. turn on failfast, to prevent blocking
1555 * the calling function should handle failed requests
1556 */
1557 cqr->flags |= flags;
1558
1559 rc = dasd_sleep_on(cqr);
1560 if (!rc)
1561 /* trigger CIO to reprobe devices */
1562 css_schedule_reprobe();
1563 else if (cqr->intrc == -EAGAIN)
1564 rc = -EAGAIN;
1565
1566 dasd_sfree_request(cqr, cqr->memdev);
1567 return rc;
1568 }
1569
1570 /*
1571 * Valide storage server of current device.
1572 */
1573 static int dasd_eckd_validate_server(struct dasd_device *device,
1574 unsigned long flags)
1575 {
1576 struct dasd_eckd_private *private = device->private;
1577 int enable_pav, rc;
1578
1579 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1580 private->uid.type == UA_HYPER_PAV_ALIAS)
1581 return 0;
1582 if (dasd_nopav || MACHINE_IS_VM)
1583 enable_pav = 0;
1584 else
1585 enable_pav = 1;
1586 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1587
1588 /* may be requested feature is not available on server,
1589 * therefore just report error and go ahead */
1590 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1591 "returned rc=%d", private->uid.ssid, rc);
1592 return rc;
1593 }
1594
1595 /*
1596 * worker to do a validate server in case of a lost pathgroup
1597 */
1598 static void dasd_eckd_do_validate_server(struct work_struct *work)
1599 {
1600 struct dasd_device *device = container_of(work, struct dasd_device,
1601 kick_validate);
1602 unsigned long flags = 0;
1603
1604 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1605 if (dasd_eckd_validate_server(device, flags)
1606 == -EAGAIN) {
1607 /* schedule worker again if failed */
1608 schedule_work(&device->kick_validate);
1609 return;
1610 }
1611
1612 dasd_put_device(device);
1613 }
1614
1615 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1616 {
1617 dasd_get_device(device);
1618 /* exit if device not online or in offline processing */
1619 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1620 device->state < DASD_STATE_ONLINE) {
1621 dasd_put_device(device);
1622 return;
1623 }
1624 /* queue call to do_validate_server to the kernel event daemon. */
1625 if (!schedule_work(&device->kick_validate))
1626 dasd_put_device(device);
1627 }
1628
1629 /*
1630 * Check device characteristics.
1631 * If the device is accessible using ECKD discipline, the device is enabled.
1632 */
1633 static int
1634 dasd_eckd_check_characteristics(struct dasd_device *device)
1635 {
1636 struct dasd_eckd_private *private = device->private;
1637 struct dasd_block *block;
1638 struct dasd_uid temp_uid;
1639 int rc, i;
1640 int readonly;
1641 unsigned long value;
1642
1643 /* setup work queue for validate server*/
1644 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1645 /* setup work queue for summary unit check */
1646 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1647
1648 if (!ccw_device_is_pathgroup(device->cdev)) {
1649 dev_warn(&device->cdev->dev,
1650 "A channel path group could not be established\n");
1651 return -EIO;
1652 }
1653 if (!ccw_device_is_multipath(device->cdev)) {
1654 dev_info(&device->cdev->dev,
1655 "The DASD is not operating in multipath mode\n");
1656 }
1657 if (!private) {
1658 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1659 if (!private) {
1660 dev_warn(&device->cdev->dev,
1661 "Allocating memory for private DASD data "
1662 "failed\n");
1663 return -ENOMEM;
1664 }
1665 device->private = private;
1666 } else {
1667 memset(private, 0, sizeof(*private));
1668 }
1669 /* Invalidate status of initial analysis. */
1670 private->init_cqr_status = -1;
1671 /* Set default cache operations. */
1672 private->attrib.operation = DASD_NORMAL_CACHE;
1673 private->attrib.nr_cyl = 0;
1674
1675 /* Read Configuration Data */
1676 rc = dasd_eckd_read_conf(device);
1677 if (rc)
1678 goto out_err1;
1679
1680 /* set some default values */
1681 device->default_expires = DASD_EXPIRES;
1682 device->default_retries = DASD_RETRIES;
1683 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
1684 device->path_interval = DASD_ECKD_PATH_INTERVAL;
1685
1686 if (private->gneq) {
1687 value = 1;
1688 for (i = 0; i < private->gneq->timeout.value; i++)
1689 value = 10 * value;
1690 value = value * private->gneq->timeout.number;
1691 /* do not accept useless values */
1692 if (value != 0 && value <= DASD_EXPIRES_MAX)
1693 device->default_expires = value;
1694 }
1695
1696 dasd_eckd_get_uid(device, &temp_uid);
1697 if (temp_uid.type == UA_BASE_DEVICE) {
1698 block = dasd_alloc_block();
1699 if (IS_ERR(block)) {
1700 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1701 "could not allocate dasd "
1702 "block structure");
1703 rc = PTR_ERR(block);
1704 goto out_err1;
1705 }
1706 device->block = block;
1707 block->base = device;
1708 }
1709
1710 /* register lcu with alias handling, enable PAV */
1711 rc = dasd_alias_make_device_known_to_lcu(device);
1712 if (rc)
1713 goto out_err2;
1714
1715 dasd_eckd_validate_server(device, 0);
1716
1717 /* device may report different configuration data after LCU setup */
1718 rc = dasd_eckd_read_conf(device);
1719 if (rc)
1720 goto out_err3;
1721
1722 /* Read Feature Codes */
1723 dasd_eckd_read_features(device);
1724
1725 /* Read Device Characteristics */
1726 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1727 &private->rdc_data, 64);
1728 if (rc) {
1729 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1730 "Read device characteristic failed, rc=%d", rc);
1731 goto out_err3;
1732 }
1733
1734 if ((device->features & DASD_FEATURE_USERAW) &&
1735 !(private->rdc_data.facilities.RT_in_LR)) {
1736 dev_err(&device->cdev->dev, "The storage server does not "
1737 "support raw-track access\n");
1738 rc = -EINVAL;
1739 goto out_err3;
1740 }
1741
1742 /* find the valid cylinder size */
1743 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1744 private->rdc_data.long_no_cyl)
1745 private->real_cyl = private->rdc_data.long_no_cyl;
1746 else
1747 private->real_cyl = private->rdc_data.no_cyl;
1748
1749 private->fcx_max_data = get_fcx_max_data(device);
1750
1751 readonly = dasd_device_is_ro(device);
1752 if (readonly)
1753 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1754
1755 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1756 "with %d cylinders, %d heads, %d sectors%s\n",
1757 private->rdc_data.dev_type,
1758 private->rdc_data.dev_model,
1759 private->rdc_data.cu_type,
1760 private->rdc_data.cu_model.model,
1761 private->real_cyl,
1762 private->rdc_data.trk_per_cyl,
1763 private->rdc_data.sec_per_trk,
1764 readonly ? ", read-only device" : "");
1765 return 0;
1766
1767 out_err3:
1768 dasd_alias_disconnect_device_from_lcu(device);
1769 out_err2:
1770 dasd_free_block(device->block);
1771 device->block = NULL;
1772 out_err1:
1773 dasd_eckd_clear_conf_data(device);
1774 kfree(device->private);
1775 device->private = NULL;
1776 return rc;
1777 }
1778
1779 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1780 {
1781 struct dasd_eckd_private *private = device->private;
1782
1783 if (!private)
1784 return;
1785
1786 dasd_alias_disconnect_device_from_lcu(device);
1787 private->ned = NULL;
1788 private->sneq = NULL;
1789 private->vdsneq = NULL;
1790 private->gneq = NULL;
1791 dasd_eckd_clear_conf_data(device);
1792 }
1793
1794 static struct dasd_ccw_req *
1795 dasd_eckd_analysis_ccw(struct dasd_device *device)
1796 {
1797 struct dasd_eckd_private *private = device->private;
1798 struct eckd_count *count_data;
1799 struct LO_eckd_data *LO_data;
1800 struct dasd_ccw_req *cqr;
1801 struct ccw1 *ccw;
1802 int cplength, datasize;
1803 int i;
1804
1805 cplength = 8;
1806 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1807 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
1808 NULL);
1809 if (IS_ERR(cqr))
1810 return cqr;
1811 ccw = cqr->cpaddr;
1812 /* Define extent for the first 3 tracks. */
1813 define_extent(ccw++, cqr->data, 0, 2,
1814 DASD_ECKD_CCW_READ_COUNT, device, 0);
1815 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1816 /* Locate record for the first 4 records on track 0. */
1817 ccw[-1].flags |= CCW_FLAG_CC;
1818 locate_record(ccw++, LO_data++, 0, 0, 4,
1819 DASD_ECKD_CCW_READ_COUNT, device, 0);
1820
1821 count_data = private->count_area;
1822 for (i = 0; i < 4; i++) {
1823 ccw[-1].flags |= CCW_FLAG_CC;
1824 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1825 ccw->flags = 0;
1826 ccw->count = 8;
1827 ccw->cda = (__u32)(addr_t) count_data;
1828 ccw++;
1829 count_data++;
1830 }
1831
1832 /* Locate record for the first record on track 2. */
1833 ccw[-1].flags |= CCW_FLAG_CC;
1834 locate_record(ccw++, LO_data++, 2, 0, 1,
1835 DASD_ECKD_CCW_READ_COUNT, device, 0);
1836 /* Read count ccw. */
1837 ccw[-1].flags |= CCW_FLAG_CC;
1838 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1839 ccw->flags = 0;
1840 ccw->count = 8;
1841 ccw->cda = (__u32)(addr_t) count_data;
1842
1843 cqr->block = NULL;
1844 cqr->startdev = device;
1845 cqr->memdev = device;
1846 cqr->retries = 255;
1847 cqr->buildclk = get_tod_clock();
1848 cqr->status = DASD_CQR_FILLED;
1849 return cqr;
1850 }
1851
1852 /* differentiate between 'no record found' and any other error */
1853 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1854 {
1855 char *sense;
1856 if (init_cqr->status == DASD_CQR_DONE)
1857 return INIT_CQR_OK;
1858 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1859 init_cqr->status == DASD_CQR_FAILED) {
1860 sense = dasd_get_sense(&init_cqr->irb);
1861 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1862 return INIT_CQR_UNFORMATTED;
1863 else
1864 return INIT_CQR_ERROR;
1865 } else
1866 return INIT_CQR_ERROR;
1867 }
1868
1869 /*
1870 * This is the callback function for the init_analysis cqr. It saves
1871 * the status of the initial analysis ccw before it frees it and kicks
1872 * the device to continue the startup sequence. This will call
1873 * dasd_eckd_do_analysis again (if the devices has not been marked
1874 * for deletion in the meantime).
1875 */
1876 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1877 void *data)
1878 {
1879 struct dasd_device *device = init_cqr->startdev;
1880 struct dasd_eckd_private *private = device->private;
1881
1882 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1883 dasd_sfree_request(init_cqr, device);
1884 dasd_kick_device(device);
1885 }
1886
1887 static int dasd_eckd_start_analysis(struct dasd_block *block)
1888 {
1889 struct dasd_ccw_req *init_cqr;
1890
1891 init_cqr = dasd_eckd_analysis_ccw(block->base);
1892 if (IS_ERR(init_cqr))
1893 return PTR_ERR(init_cqr);
1894 init_cqr->callback = dasd_eckd_analysis_callback;
1895 init_cqr->callback_data = NULL;
1896 init_cqr->expires = 5*HZ;
1897 /* first try without ERP, so we can later handle unformatted
1898 * devices as special case
1899 */
1900 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1901 init_cqr->retries = 0;
1902 dasd_add_request_head(init_cqr);
1903 return -EAGAIN;
1904 }
1905
1906 static int dasd_eckd_end_analysis(struct dasd_block *block)
1907 {
1908 struct dasd_device *device = block->base;
1909 struct dasd_eckd_private *private = device->private;
1910 struct eckd_count *count_area;
1911 unsigned int sb, blk_per_trk;
1912 int status, i;
1913 struct dasd_ccw_req *init_cqr;
1914
1915 status = private->init_cqr_status;
1916 private->init_cqr_status = -1;
1917 if (status == INIT_CQR_ERROR) {
1918 /* try again, this time with full ERP */
1919 init_cqr = dasd_eckd_analysis_ccw(device);
1920 dasd_sleep_on(init_cqr);
1921 status = dasd_eckd_analysis_evaluation(init_cqr);
1922 dasd_sfree_request(init_cqr, device);
1923 }
1924
1925 if (device->features & DASD_FEATURE_USERAW) {
1926 block->bp_block = DASD_RAW_BLOCKSIZE;
1927 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1928 block->s2b_shift = 3;
1929 goto raw;
1930 }
1931
1932 if (status == INIT_CQR_UNFORMATTED) {
1933 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1934 return -EMEDIUMTYPE;
1935 } else if (status == INIT_CQR_ERROR) {
1936 dev_err(&device->cdev->dev,
1937 "Detecting the DASD disk layout failed because "
1938 "of an I/O error\n");
1939 return -EIO;
1940 }
1941
1942 private->uses_cdl = 1;
1943 /* Check Track 0 for Compatible Disk Layout */
1944 count_area = NULL;
1945 for (i = 0; i < 3; i++) {
1946 if (private->count_area[i].kl != 4 ||
1947 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1948 private->count_area[i].cyl != 0 ||
1949 private->count_area[i].head != count_area_head[i] ||
1950 private->count_area[i].record != count_area_rec[i]) {
1951 private->uses_cdl = 0;
1952 break;
1953 }
1954 }
1955 if (i == 3)
1956 count_area = &private->count_area[4];
1957
1958 if (private->uses_cdl == 0) {
1959 for (i = 0; i < 5; i++) {
1960 if ((private->count_area[i].kl != 0) ||
1961 (private->count_area[i].dl !=
1962 private->count_area[0].dl) ||
1963 private->count_area[i].cyl != 0 ||
1964 private->count_area[i].head != count_area_head[i] ||
1965 private->count_area[i].record != count_area_rec[i])
1966 break;
1967 }
1968 if (i == 5)
1969 count_area = &private->count_area[0];
1970 } else {
1971 if (private->count_area[3].record == 1)
1972 dev_warn(&device->cdev->dev,
1973 "Track 0 has no records following the VTOC\n");
1974 }
1975
1976 if (count_area != NULL && count_area->kl == 0) {
1977 /* we found notthing violating our disk layout */
1978 if (dasd_check_blocksize(count_area->dl) == 0)
1979 block->bp_block = count_area->dl;
1980 }
1981 if (block->bp_block == 0) {
1982 dev_warn(&device->cdev->dev,
1983 "The disk layout of the DASD is not supported\n");
1984 return -EMEDIUMTYPE;
1985 }
1986 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1987 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1988 block->s2b_shift++;
1989
1990 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1991
1992 raw:
1993 block->blocks = ((unsigned long) private->real_cyl *
1994 private->rdc_data.trk_per_cyl *
1995 blk_per_trk);
1996
1997 dev_info(&device->cdev->dev,
1998 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
1999 "%s\n", (block->bp_block >> 10),
2000 (((unsigned long) private->real_cyl *
2001 private->rdc_data.trk_per_cyl *
2002 blk_per_trk * (block->bp_block >> 9)) >> 1),
2003 ((blk_per_trk * block->bp_block) >> 10),
2004 private->uses_cdl ?
2005 "compatible disk layout" : "linux disk layout");
2006
2007 return 0;
2008 }
2009
2010 static int dasd_eckd_do_analysis(struct dasd_block *block)
2011 {
2012 struct dasd_eckd_private *private = block->base->private;
2013
2014 if (private->init_cqr_status < 0)
2015 return dasd_eckd_start_analysis(block);
2016 else
2017 return dasd_eckd_end_analysis(block);
2018 }
2019
2020 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2021 {
2022 return dasd_alias_add_device(device);
2023 };
2024
2025 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2026 {
2027 if (cancel_work_sync(&device->reload_device))
2028 dasd_put_device(device);
2029 if (cancel_work_sync(&device->kick_validate))
2030 dasd_put_device(device);
2031
2032 return 0;
2033 };
2034
2035 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2036 {
2037 return dasd_alias_remove_device(device);
2038 };
2039
2040 static int
2041 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2042 {
2043 struct dasd_eckd_private *private = block->base->private;
2044
2045 if (dasd_check_blocksize(block->bp_block) == 0) {
2046 geo->sectors = recs_per_track(&private->rdc_data,
2047 0, block->bp_block);
2048 }
2049 geo->cylinders = private->rdc_data.no_cyl;
2050 geo->heads = private->rdc_data.trk_per_cyl;
2051 return 0;
2052 }
2053
2054 /*
2055 * Build the TCW request for the format check
2056 */
2057 static struct dasd_ccw_req *
2058 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2059 int enable_pav, struct eckd_count *fmt_buffer,
2060 int rpt)
2061 {
2062 struct dasd_eckd_private *start_priv;
2063 struct dasd_device *startdev = NULL;
2064 struct tidaw *last_tidaw = NULL;
2065 struct dasd_ccw_req *cqr;
2066 struct itcw *itcw;
2067 int itcw_size;
2068 int count;
2069 int rc;
2070 int i;
2071
2072 if (enable_pav)
2073 startdev = dasd_alias_get_start_dev(base);
2074
2075 if (!startdev)
2076 startdev = base;
2077
2078 start_priv = startdev->private;
2079
2080 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2081
2082 /*
2083 * we're adding 'count' amount of tidaw to the itcw.
2084 * calculate the corresponding itcw_size
2085 */
2086 itcw_size = itcw_calc_size(0, count, 0);
2087
2088 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
2089 NULL);
2090 if (IS_ERR(cqr))
2091 return cqr;
2092
2093 start_priv->count++;
2094
2095 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2096 if (IS_ERR(itcw)) {
2097 rc = -EINVAL;
2098 goto out_err;
2099 }
2100
2101 cqr->cpaddr = itcw_get_tcw(itcw);
2102 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2103 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2104 sizeof(struct eckd_count),
2105 count * sizeof(struct eckd_count), 0, rpt);
2106 if (rc)
2107 goto out_err;
2108
2109 for (i = 0; i < count; i++) {
2110 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2111 sizeof(struct eckd_count));
2112 if (IS_ERR(last_tidaw)) {
2113 rc = -EINVAL;
2114 goto out_err;
2115 }
2116 }
2117
2118 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2119 itcw_finalize(itcw);
2120
2121 cqr->cpmode = 1;
2122 cqr->startdev = startdev;
2123 cqr->memdev = startdev;
2124 cqr->basedev = base;
2125 cqr->retries = startdev->default_retries;
2126 cqr->expires = startdev->default_expires * HZ;
2127 cqr->buildclk = get_tod_clock();
2128 cqr->status = DASD_CQR_FILLED;
2129 /* Set flags to suppress output for expected errors */
2130 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2131 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2132
2133 return cqr;
2134
2135 out_err:
2136 dasd_sfree_request(cqr, startdev);
2137
2138 return ERR_PTR(rc);
2139 }
2140
2141 /*
2142 * Build the CCW request for the format check
2143 */
2144 static struct dasd_ccw_req *
2145 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2146 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2147 {
2148 struct dasd_eckd_private *start_priv;
2149 struct dasd_eckd_private *base_priv;
2150 struct dasd_device *startdev = NULL;
2151 struct dasd_ccw_req *cqr;
2152 struct ccw1 *ccw;
2153 void *data;
2154 int cplength, datasize;
2155 int use_prefix;
2156 int count;
2157 int i;
2158
2159 if (enable_pav)
2160 startdev = dasd_alias_get_start_dev(base);
2161
2162 if (!startdev)
2163 startdev = base;
2164
2165 start_priv = startdev->private;
2166 base_priv = base->private;
2167
2168 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2169
2170 use_prefix = base_priv->features.feature[8] & 0x01;
2171
2172 if (use_prefix) {
2173 cplength = 1;
2174 datasize = sizeof(struct PFX_eckd_data);
2175 } else {
2176 cplength = 2;
2177 datasize = sizeof(struct DE_eckd_data) +
2178 sizeof(struct LO_eckd_data);
2179 }
2180 cplength += count;
2181
2182 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2183 startdev, NULL);
2184 if (IS_ERR(cqr))
2185 return cqr;
2186
2187 start_priv->count++;
2188 data = cqr->data;
2189 ccw = cqr->cpaddr;
2190
2191 if (use_prefix) {
2192 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2193 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2194 count, 0, 0);
2195 } else {
2196 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2197 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2198
2199 data += sizeof(struct DE_eckd_data);
2200 ccw[-1].flags |= CCW_FLAG_CC;
2201
2202 locate_record(ccw++, data, fdata->start_unit, 0, count,
2203 DASD_ECKD_CCW_READ_COUNT, base, 0);
2204 }
2205
2206 for (i = 0; i < count; i++) {
2207 ccw[-1].flags |= CCW_FLAG_CC;
2208 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2209 ccw->flags = CCW_FLAG_SLI;
2210 ccw->count = 8;
2211 ccw->cda = (__u32)(addr_t) fmt_buffer;
2212 ccw++;
2213 fmt_buffer++;
2214 }
2215
2216 cqr->startdev = startdev;
2217 cqr->memdev = startdev;
2218 cqr->basedev = base;
2219 cqr->retries = DASD_RETRIES;
2220 cqr->expires = startdev->default_expires * HZ;
2221 cqr->buildclk = get_tod_clock();
2222 cqr->status = DASD_CQR_FILLED;
2223 /* Set flags to suppress output for expected errors */
2224 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2225
2226 return cqr;
2227 }
2228
2229 static struct dasd_ccw_req *
2230 dasd_eckd_build_format(struct dasd_device *base,
2231 struct format_data_t *fdata,
2232 int enable_pav)
2233 {
2234 struct dasd_eckd_private *base_priv;
2235 struct dasd_eckd_private *start_priv;
2236 struct dasd_device *startdev = NULL;
2237 struct dasd_ccw_req *fcp;
2238 struct eckd_count *ect;
2239 struct ch_t address;
2240 struct ccw1 *ccw;
2241 void *data;
2242 int rpt;
2243 int cplength, datasize;
2244 int i, j;
2245 int intensity = 0;
2246 int r0_perm;
2247 int nr_tracks;
2248 int use_prefix;
2249
2250 if (enable_pav)
2251 startdev = dasd_alias_get_start_dev(base);
2252
2253 if (!startdev)
2254 startdev = base;
2255
2256 start_priv = startdev->private;
2257 base_priv = base->private;
2258
2259 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2260
2261 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2262
2263 /*
2264 * fdata->intensity is a bit string that tells us what to do:
2265 * Bit 0: write record zero
2266 * Bit 1: write home address, currently not supported
2267 * Bit 2: invalidate tracks
2268 * Bit 3: use OS/390 compatible disk layout (cdl)
2269 * Bit 4: do not allow storage subsystem to modify record zero
2270 * Only some bit combinations do make sense.
2271 */
2272 if (fdata->intensity & 0x10) {
2273 r0_perm = 0;
2274 intensity = fdata->intensity & ~0x10;
2275 } else {
2276 r0_perm = 1;
2277 intensity = fdata->intensity;
2278 }
2279
2280 use_prefix = base_priv->features.feature[8] & 0x01;
2281
2282 switch (intensity) {
2283 case 0x00: /* Normal format */
2284 case 0x08: /* Normal format, use cdl. */
2285 cplength = 2 + (rpt*nr_tracks);
2286 if (use_prefix)
2287 datasize = sizeof(struct PFX_eckd_data) +
2288 sizeof(struct LO_eckd_data) +
2289 rpt * nr_tracks * sizeof(struct eckd_count);
2290 else
2291 datasize = sizeof(struct DE_eckd_data) +
2292 sizeof(struct LO_eckd_data) +
2293 rpt * nr_tracks * sizeof(struct eckd_count);
2294 break;
2295 case 0x01: /* Write record zero and format track. */
2296 case 0x09: /* Write record zero and format track, use cdl. */
2297 cplength = 2 + rpt * nr_tracks;
2298 if (use_prefix)
2299 datasize = sizeof(struct PFX_eckd_data) +
2300 sizeof(struct LO_eckd_data) +
2301 sizeof(struct eckd_count) +
2302 rpt * nr_tracks * sizeof(struct eckd_count);
2303 else
2304 datasize = sizeof(struct DE_eckd_data) +
2305 sizeof(struct LO_eckd_data) +
2306 sizeof(struct eckd_count) +
2307 rpt * nr_tracks * sizeof(struct eckd_count);
2308 break;
2309 case 0x04: /* Invalidate track. */
2310 case 0x0c: /* Invalidate track, use cdl. */
2311 cplength = 3;
2312 if (use_prefix)
2313 datasize = sizeof(struct PFX_eckd_data) +
2314 sizeof(struct LO_eckd_data) +
2315 sizeof(struct eckd_count);
2316 else
2317 datasize = sizeof(struct DE_eckd_data) +
2318 sizeof(struct LO_eckd_data) +
2319 sizeof(struct eckd_count);
2320 break;
2321 default:
2322 dev_warn(&startdev->cdev->dev,
2323 "An I/O control call used incorrect flags 0x%x\n",
2324 fdata->intensity);
2325 return ERR_PTR(-EINVAL);
2326 }
2327 /* Allocate the format ccw request. */
2328 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2329 datasize, startdev, NULL);
2330 if (IS_ERR(fcp))
2331 return fcp;
2332
2333 start_priv->count++;
2334 data = fcp->data;
2335 ccw = fcp->cpaddr;
2336
2337 switch (intensity & ~0x08) {
2338 case 0x00: /* Normal format. */
2339 if (use_prefix) {
2340 prefix(ccw++, (struct PFX_eckd_data *) data,
2341 fdata->start_unit, fdata->stop_unit,
2342 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2343 /* grant subsystem permission to format R0 */
2344 if (r0_perm)
2345 ((struct PFX_eckd_data *)data)
2346 ->define_extent.ga_extended |= 0x04;
2347 data += sizeof(struct PFX_eckd_data);
2348 } else {
2349 define_extent(ccw++, (struct DE_eckd_data *) data,
2350 fdata->start_unit, fdata->stop_unit,
2351 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2352 /* grant subsystem permission to format R0 */
2353 if (r0_perm)
2354 ((struct DE_eckd_data *) data)
2355 ->ga_extended |= 0x04;
2356 data += sizeof(struct DE_eckd_data);
2357 }
2358 ccw[-1].flags |= CCW_FLAG_CC;
2359 locate_record(ccw++, (struct LO_eckd_data *) data,
2360 fdata->start_unit, 0, rpt*nr_tracks,
2361 DASD_ECKD_CCW_WRITE_CKD, base,
2362 fdata->blksize);
2363 data += sizeof(struct LO_eckd_data);
2364 break;
2365 case 0x01: /* Write record zero + format track. */
2366 if (use_prefix) {
2367 prefix(ccw++, (struct PFX_eckd_data *) data,
2368 fdata->start_unit, fdata->stop_unit,
2369 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2370 base, startdev);
2371 data += sizeof(struct PFX_eckd_data);
2372 } else {
2373 define_extent(ccw++, (struct DE_eckd_data *) data,
2374 fdata->start_unit, fdata->stop_unit,
2375 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2376 data += sizeof(struct DE_eckd_data);
2377 }
2378 ccw[-1].flags |= CCW_FLAG_CC;
2379 locate_record(ccw++, (struct LO_eckd_data *) data,
2380 fdata->start_unit, 0, rpt * nr_tracks + 1,
2381 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2382 base->block->bp_block);
2383 data += sizeof(struct LO_eckd_data);
2384 break;
2385 case 0x04: /* Invalidate track. */
2386 if (use_prefix) {
2387 prefix(ccw++, (struct PFX_eckd_data *) data,
2388 fdata->start_unit, fdata->stop_unit,
2389 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2390 data += sizeof(struct PFX_eckd_data);
2391 } else {
2392 define_extent(ccw++, (struct DE_eckd_data *) data,
2393 fdata->start_unit, fdata->stop_unit,
2394 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2395 data += sizeof(struct DE_eckd_data);
2396 }
2397 ccw[-1].flags |= CCW_FLAG_CC;
2398 locate_record(ccw++, (struct LO_eckd_data *) data,
2399 fdata->start_unit, 0, 1,
2400 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2401 data += sizeof(struct LO_eckd_data);
2402 break;
2403 }
2404
2405 for (j = 0; j < nr_tracks; j++) {
2406 /* calculate cylinder and head for the current track */
2407 set_ch_t(&address,
2408 (fdata->start_unit + j) /
2409 base_priv->rdc_data.trk_per_cyl,
2410 (fdata->start_unit + j) %
2411 base_priv->rdc_data.trk_per_cyl);
2412 if (intensity & 0x01) { /* write record zero */
2413 ect = (struct eckd_count *) data;
2414 data += sizeof(struct eckd_count);
2415 ect->cyl = address.cyl;
2416 ect->head = address.head;
2417 ect->record = 0;
2418 ect->kl = 0;
2419 ect->dl = 8;
2420 ccw[-1].flags |= CCW_FLAG_CC;
2421 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2422 ccw->flags = CCW_FLAG_SLI;
2423 ccw->count = 8;
2424 ccw->cda = (__u32)(addr_t) ect;
2425 ccw++;
2426 }
2427 if ((intensity & ~0x08) & 0x04) { /* erase track */
2428 ect = (struct eckd_count *) data;
2429 data += sizeof(struct eckd_count);
2430 ect->cyl = address.cyl;
2431 ect->head = address.head;
2432 ect->record = 1;
2433 ect->kl = 0;
2434 ect->dl = 0;
2435 ccw[-1].flags |= CCW_FLAG_CC;
2436 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2437 ccw->flags = CCW_FLAG_SLI;
2438 ccw->count = 8;
2439 ccw->cda = (__u32)(addr_t) ect;
2440 } else { /* write remaining records */
2441 for (i = 0; i < rpt; i++) {
2442 ect = (struct eckd_count *) data;
2443 data += sizeof(struct eckd_count);
2444 ect->cyl = address.cyl;
2445 ect->head = address.head;
2446 ect->record = i + 1;
2447 ect->kl = 0;
2448 ect->dl = fdata->blksize;
2449 /*
2450 * Check for special tracks 0-1
2451 * when formatting CDL
2452 */
2453 if ((intensity & 0x08) &&
2454 address.cyl == 0 && address.head == 0) {
2455 if (i < 3) {
2456 ect->kl = 4;
2457 ect->dl = sizes_trk0[i] - 4;
2458 }
2459 }
2460 if ((intensity & 0x08) &&
2461 address.cyl == 0 && address.head == 1) {
2462 ect->kl = 44;
2463 ect->dl = LABEL_SIZE - 44;
2464 }
2465 ccw[-1].flags |= CCW_FLAG_CC;
2466 if (i != 0 || j == 0)
2467 ccw->cmd_code =
2468 DASD_ECKD_CCW_WRITE_CKD;
2469 else
2470 ccw->cmd_code =
2471 DASD_ECKD_CCW_WRITE_CKD_MT;
2472 ccw->flags = CCW_FLAG_SLI;
2473 ccw->count = 8;
2474 ccw->cda = (__u32)(addr_t) ect;
2475 ccw++;
2476 }
2477 }
2478 }
2479
2480 fcp->startdev = startdev;
2481 fcp->memdev = startdev;
2482 fcp->basedev = base;
2483 fcp->retries = 256;
2484 fcp->expires = startdev->default_expires * HZ;
2485 fcp->buildclk = get_tod_clock();
2486 fcp->status = DASD_CQR_FILLED;
2487
2488 return fcp;
2489 }
2490
2491 /*
2492 * Wrapper function to build a CCW request depending on input data
2493 */
2494 static struct dasd_ccw_req *
2495 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2496 struct format_data_t *fdata, int enable_pav,
2497 int tpm, struct eckd_count *fmt_buffer, int rpt)
2498 {
2499 struct dasd_ccw_req *ccw_req;
2500
2501 if (!fmt_buffer) {
2502 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2503 } else {
2504 if (tpm)
2505 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2506 enable_pav,
2507 fmt_buffer, rpt);
2508 else
2509 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2510 fmt_buffer, rpt);
2511 }
2512
2513 return ccw_req;
2514 }
2515
2516 /*
2517 * Sanity checks on format_data
2518 */
2519 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2520 struct format_data_t *fdata)
2521 {
2522 struct dasd_eckd_private *private = base->private;
2523
2524 if (fdata->start_unit >=
2525 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2526 dev_warn(&base->cdev->dev,
2527 "Start track number %u used in formatting is too big\n",
2528 fdata->start_unit);
2529 return -EINVAL;
2530 }
2531 if (fdata->stop_unit >=
2532 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2533 dev_warn(&base->cdev->dev,
2534 "Stop track number %u used in formatting is too big\n",
2535 fdata->stop_unit);
2536 return -EINVAL;
2537 }
2538 if (fdata->start_unit > fdata->stop_unit) {
2539 dev_warn(&base->cdev->dev,
2540 "Start track %u used in formatting exceeds end track\n",
2541 fdata->start_unit);
2542 return -EINVAL;
2543 }
2544 if (dasd_check_blocksize(fdata->blksize) != 0) {
2545 dev_warn(&base->cdev->dev,
2546 "The DASD cannot be formatted with block size %u\n",
2547 fdata->blksize);
2548 return -EINVAL;
2549 }
2550 return 0;
2551 }
2552
2553 /*
2554 * This function will process format_data originally coming from an IOCTL
2555 */
2556 static int dasd_eckd_format_process_data(struct dasd_device *base,
2557 struct format_data_t *fdata,
2558 int enable_pav, int tpm,
2559 struct eckd_count *fmt_buffer, int rpt,
2560 struct irb *irb)
2561 {
2562 struct dasd_eckd_private *private = base->private;
2563 struct dasd_ccw_req *cqr, *n;
2564 struct list_head format_queue;
2565 struct dasd_device *device;
2566 char *sense = NULL;
2567 int old_start, old_stop, format_step;
2568 int step, retry;
2569 int rc;
2570
2571 rc = dasd_eckd_format_sanity_checks(base, fdata);
2572 if (rc)
2573 return rc;
2574
2575 INIT_LIST_HEAD(&format_queue);
2576
2577 old_start = fdata->start_unit;
2578 old_stop = fdata->stop_unit;
2579
2580 if (!tpm && fmt_buffer != NULL) {
2581 /* Command Mode / Format Check */
2582 format_step = 1;
2583 } else if (tpm && fmt_buffer != NULL) {
2584 /* Transport Mode / Format Check */
2585 format_step = DASD_CQR_MAX_CCW / rpt;
2586 } else {
2587 /* Normal Formatting */
2588 format_step = DASD_CQR_MAX_CCW /
2589 recs_per_track(&private->rdc_data, 0, fdata->blksize);
2590 }
2591
2592 do {
2593 retry = 0;
2594 while (fdata->start_unit <= old_stop) {
2595 step = fdata->stop_unit - fdata->start_unit + 1;
2596 if (step > format_step) {
2597 fdata->stop_unit =
2598 fdata->start_unit + format_step - 1;
2599 }
2600
2601 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2602 enable_pav, tpm,
2603 fmt_buffer, rpt);
2604 if (IS_ERR(cqr)) {
2605 rc = PTR_ERR(cqr);
2606 if (rc == -ENOMEM) {
2607 if (list_empty(&format_queue))
2608 goto out;
2609 /*
2610 * not enough memory available, start
2611 * requests retry after first requests
2612 * were finished
2613 */
2614 retry = 1;
2615 break;
2616 }
2617 goto out_err;
2618 }
2619 list_add_tail(&cqr->blocklist, &format_queue);
2620
2621 if (fmt_buffer) {
2622 step = fdata->stop_unit - fdata->start_unit + 1;
2623 fmt_buffer += rpt * step;
2624 }
2625 fdata->start_unit = fdata->stop_unit + 1;
2626 fdata->stop_unit = old_stop;
2627 }
2628
2629 rc = dasd_sleep_on_queue(&format_queue);
2630
2631 out_err:
2632 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2633 device = cqr->startdev;
2634 private = device->private;
2635
2636 if (cqr->status == DASD_CQR_FAILED) {
2637 /*
2638 * Only get sense data if called by format
2639 * check
2640 */
2641 if (fmt_buffer && irb) {
2642 sense = dasd_get_sense(&cqr->irb);
2643 memcpy(irb, &cqr->irb, sizeof(*irb));
2644 }
2645 rc = -EIO;
2646 }
2647 list_del_init(&cqr->blocklist);
2648 dasd_sfree_request(cqr, device);
2649 private->count--;
2650 }
2651
2652 if (rc && rc != -EIO)
2653 goto out;
2654 if (rc == -EIO) {
2655 /*
2656 * In case fewer than the expected records are on the
2657 * track, we will most likely get a 'No Record Found'
2658 * error (in command mode) or a 'File Protected' error
2659 * (in transport mode). Those particular cases shouldn't
2660 * pass the -EIO to the IOCTL, therefore reset the rc
2661 * and continue.
2662 */
2663 if (sense &&
2664 (sense[1] & SNS1_NO_REC_FOUND ||
2665 sense[1] & SNS1_FILE_PROTECTED))
2666 retry = 1;
2667 else
2668 goto out;
2669 }
2670
2671 } while (retry);
2672
2673 out:
2674 fdata->start_unit = old_start;
2675 fdata->stop_unit = old_stop;
2676
2677 return rc;
2678 }
2679
2680 static int dasd_eckd_format_device(struct dasd_device *base,
2681 struct format_data_t *fdata, int enable_pav)
2682 {
2683 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2684 0, NULL);
2685 }
2686
2687 /*
2688 * Helper function to count consecutive records of a single track.
2689 */
2690 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2691 int max)
2692 {
2693 int head;
2694 int i;
2695
2696 head = fmt_buffer[start].head;
2697
2698 /*
2699 * There are 3 conditions where we stop counting:
2700 * - if data reoccurs (same head and record may reoccur), which may
2701 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
2702 * - when the head changes, because we're iterating over several tracks
2703 * then (DASD_ECKD_CCW_READ_COUNT_MT)
2704 * - when we've reached the end of sensible data in the buffer (the
2705 * record will be 0 then)
2706 */
2707 for (i = start; i < max; i++) {
2708 if (i > start) {
2709 if ((fmt_buffer[i].head == head &&
2710 fmt_buffer[i].record == 1) ||
2711 fmt_buffer[i].head != head ||
2712 fmt_buffer[i].record == 0)
2713 break;
2714 }
2715 }
2716
2717 return i - start;
2718 }
2719
2720 /*
2721 * Evaluate a given range of tracks. Data like number of records, blocksize,
2722 * record ids, and key length are compared with expected data.
2723 *
2724 * If a mismatch occurs, the corresponding error bit is set, as well as
2725 * additional information, depending on the error.
2726 */
2727 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2728 struct format_check_t *cdata,
2729 int rpt_max, int rpt_exp,
2730 int trk_per_cyl, int tpm)
2731 {
2732 struct ch_t geo;
2733 int max_entries;
2734 int count = 0;
2735 int trkcount;
2736 int blksize;
2737 int pos = 0;
2738 int i, j;
2739 int kl;
2740
2741 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2742 max_entries = trkcount * rpt_max;
2743
2744 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2745 /* Calculate the correct next starting position in the buffer */
2746 if (tpm) {
2747 while (fmt_buffer[pos].record == 0 &&
2748 fmt_buffer[pos].dl == 0) {
2749 if (pos++ > max_entries)
2750 break;
2751 }
2752 } else {
2753 if (i != cdata->expect.start_unit)
2754 pos += rpt_max - count;
2755 }
2756
2757 /* Calculate the expected geo values for the current track */
2758 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2759
2760 /* Count and check number of records */
2761 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2762
2763 if (count < rpt_exp) {
2764 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2765 break;
2766 }
2767 if (count > rpt_exp) {
2768 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2769 break;
2770 }
2771
2772 for (j = 0; j < count; j++, pos++) {
2773 blksize = cdata->expect.blksize;
2774 kl = 0;
2775
2776 /*
2777 * Set special values when checking CDL formatted
2778 * devices.
2779 */
2780 if ((cdata->expect.intensity & 0x08) &&
2781 geo.cyl == 0 && geo.head == 0) {
2782 if (j < 3) {
2783 blksize = sizes_trk0[j] - 4;
2784 kl = 4;
2785 }
2786 }
2787 if ((cdata->expect.intensity & 0x08) &&
2788 geo.cyl == 0 && geo.head == 1) {
2789 blksize = LABEL_SIZE - 44;
2790 kl = 44;
2791 }
2792
2793 /* Check blocksize */
2794 if (fmt_buffer[pos].dl != blksize) {
2795 cdata->result = DASD_FMT_ERR_BLKSIZE;
2796 goto out;
2797 }
2798 /* Check if key length is 0 */
2799 if (fmt_buffer[pos].kl != kl) {
2800 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2801 goto out;
2802 }
2803 /* Check if record_id is correct */
2804 if (fmt_buffer[pos].cyl != geo.cyl ||
2805 fmt_buffer[pos].head != geo.head ||
2806 fmt_buffer[pos].record != (j + 1)) {
2807 cdata->result = DASD_FMT_ERR_RECORD_ID;
2808 goto out;
2809 }
2810 }
2811 }
2812
2813 out:
2814 /*
2815 * In case of no errors, we need to decrease by one
2816 * to get the correct positions.
2817 */
2818 if (!cdata->result) {
2819 i--;
2820 pos--;
2821 }
2822
2823 cdata->unit = i;
2824 cdata->num_records = count;
2825 cdata->rec = fmt_buffer[pos].record;
2826 cdata->blksize = fmt_buffer[pos].dl;
2827 cdata->key_length = fmt_buffer[pos].kl;
2828 }
2829
2830 /*
2831 * Check the format of a range of tracks of a DASD.
2832 */
2833 static int dasd_eckd_check_device_format(struct dasd_device *base,
2834 struct format_check_t *cdata,
2835 int enable_pav)
2836 {
2837 struct dasd_eckd_private *private = base->private;
2838 struct eckd_count *fmt_buffer;
2839 struct irb irb;
2840 int rpt_max, rpt_exp;
2841 int fmt_buffer_size;
2842 int trk_per_cyl;
2843 int trkcount;
2844 int tpm = 0;
2845 int rc;
2846
2847 trk_per_cyl = private->rdc_data.trk_per_cyl;
2848
2849 /* Get maximum and expected amount of records per track */
2850 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2851 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2852
2853 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2854 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2855
2856 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2857 if (!fmt_buffer)
2858 return -ENOMEM;
2859
2860 /*
2861 * A certain FICON feature subset is needed to operate in transport
2862 * mode. Additionally, the support for transport mode is implicitly
2863 * checked by comparing the buffer size with fcx_max_data. As long as
2864 * the buffer size is smaller we can operate in transport mode and
2865 * process multiple tracks. If not, only one track at once is being
2866 * processed using command mode.
2867 */
2868 if ((private->features.feature[40] & 0x04) &&
2869 fmt_buffer_size <= private->fcx_max_data)
2870 tpm = 1;
2871
2872 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2873 tpm, fmt_buffer, rpt_max, &irb);
2874 if (rc && rc != -EIO)
2875 goto out;
2876 if (rc == -EIO) {
2877 /*
2878 * If our first attempt with transport mode enabled comes back
2879 * with an incorrect length error, we're going to retry the
2880 * check with command mode.
2881 */
2882 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2883 tpm = 0;
2884 rc = dasd_eckd_format_process_data(base, &cdata->expect,
2885 enable_pav, tpm,
2886 fmt_buffer, rpt_max,
2887 &irb);
2888 if (rc)
2889 goto out;
2890 } else {
2891 goto out;
2892 }
2893 }
2894
2895 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2896 trk_per_cyl, tpm);
2897
2898 out:
2899 kfree(fmt_buffer);
2900
2901 return rc;
2902 }
2903
2904 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2905 {
2906 if (cqr->retries < 0) {
2907 cqr->status = DASD_CQR_FAILED;
2908 return;
2909 }
2910 cqr->status = DASD_CQR_FILLED;
2911 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2912 dasd_eckd_reset_ccw_to_base_io(cqr);
2913 cqr->startdev = cqr->block->base;
2914 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2915 }
2916 };
2917
2918 static dasd_erp_fn_t
2919 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2920 {
2921 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2922 struct ccw_device *cdev = device->cdev;
2923
2924 switch (cdev->id.cu_type) {
2925 case 0x3990:
2926 case 0x2105:
2927 case 0x2107:
2928 case 0x1750:
2929 return dasd_3990_erp_action;
2930 case 0x9343:
2931 case 0x3880:
2932 default:
2933 return dasd_default_erp_action;
2934 }
2935 }
2936
2937 static dasd_erp_fn_t
2938 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2939 {
2940 return dasd_default_erp_postaction;
2941 }
2942
2943 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2944 struct dasd_ccw_req *cqr,
2945 struct irb *irb)
2946 {
2947 char mask;
2948 char *sense = NULL;
2949 struct dasd_eckd_private *private = device->private;
2950
2951 /* first of all check for state change pending interrupt */
2952 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2953 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2954 /*
2955 * for alias only, not in offline processing
2956 * and only if not suspended
2957 */
2958 if (!device->block && private->lcu &&
2959 device->state == DASD_STATE_ONLINE &&
2960 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2961 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2962 /* schedule worker to reload device */
2963 dasd_reload_device(device);
2964 }
2965 dasd_generic_handle_state_change(device);
2966 return;
2967 }
2968
2969 sense = dasd_get_sense(irb);
2970 if (!sense)
2971 return;
2972
2973 /* summary unit check */
2974 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2975 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2976 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2977 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2978 "eckd suc: device already notified");
2979 return;
2980 }
2981 sense = dasd_get_sense(irb);
2982 if (!sense) {
2983 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2984 "eckd suc: no reason code available");
2985 clear_bit(DASD_FLAG_SUC, &device->flags);
2986 return;
2987
2988 }
2989 private->suc_reason = sense[8];
2990 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
2991 "eckd handle summary unit check: reason",
2992 private->suc_reason);
2993 dasd_get_device(device);
2994 if (!schedule_work(&device->suc_work))
2995 dasd_put_device(device);
2996
2997 return;
2998 }
2999
3000 /* service information message SIM */
3001 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3002 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3003 dasd_3990_erp_handle_sim(device, sense);
3004 return;
3005 }
3006
3007 /* loss of device reservation is handled via base devices only
3008 * as alias devices may be used with several bases
3009 */
3010 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3011 (sense[7] == 0x3F) &&
3012 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3013 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3014 if (device->features & DASD_FEATURE_FAILONSLCK)
3015 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3016 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3017 dev_err(&device->cdev->dev,
3018 "The device reservation was lost\n");
3019 }
3020 }
3021
3022 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3023 struct dasd_device *startdev,
3024 struct dasd_block *block,
3025 struct request *req,
3026 sector_t first_rec,
3027 sector_t last_rec,
3028 sector_t first_trk,
3029 sector_t last_trk,
3030 unsigned int first_offs,
3031 unsigned int last_offs,
3032 unsigned int blk_per_trk,
3033 unsigned int blksize)
3034 {
3035 struct dasd_eckd_private *private;
3036 unsigned long *idaws;
3037 struct LO_eckd_data *LO_data;
3038 struct dasd_ccw_req *cqr;
3039 struct ccw1 *ccw;
3040 struct req_iterator iter;
3041 struct bio_vec bv;
3042 char *dst;
3043 unsigned int off;
3044 int count, cidaw, cplength, datasize;
3045 sector_t recid;
3046 unsigned char cmd, rcmd;
3047 int use_prefix;
3048 struct dasd_device *basedev;
3049
3050 basedev = block->base;
3051 private = basedev->private;
3052 if (rq_data_dir(req) == READ)
3053 cmd = DASD_ECKD_CCW_READ_MT;
3054 else if (rq_data_dir(req) == WRITE)
3055 cmd = DASD_ECKD_CCW_WRITE_MT;
3056 else
3057 return ERR_PTR(-EINVAL);
3058
3059 /* Check struct bio and count the number of blocks for the request. */
3060 count = 0;
3061 cidaw = 0;
3062 rq_for_each_segment(bv, req, iter) {
3063 if (bv.bv_len & (blksize - 1))
3064 /* Eckd can only do full blocks. */
3065 return ERR_PTR(-EINVAL);
3066 count += bv.bv_len >> (block->s2b_shift + 9);
3067 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3068 cidaw += bv.bv_len >> (block->s2b_shift + 9);
3069 }
3070 /* Paranoia. */
3071 if (count != last_rec - first_rec + 1)
3072 return ERR_PTR(-EINVAL);
3073
3074 /* use the prefix command if available */
3075 use_prefix = private->features.feature[8] & 0x01;
3076 if (use_prefix) {
3077 /* 1x prefix + number of blocks */
3078 cplength = 2 + count;
3079 /* 1x prefix + cidaws*sizeof(long) */
3080 datasize = sizeof(struct PFX_eckd_data) +
3081 sizeof(struct LO_eckd_data) +
3082 cidaw * sizeof(unsigned long);
3083 } else {
3084 /* 1x define extent + 1x locate record + number of blocks */
3085 cplength = 2 + count;
3086 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3087 datasize = sizeof(struct DE_eckd_data) +
3088 sizeof(struct LO_eckd_data) +
3089 cidaw * sizeof(unsigned long);
3090 }
3091 /* Find out the number of additional locate record ccws for cdl. */
3092 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3093 if (last_rec >= 2*blk_per_trk)
3094 count = 2*blk_per_trk - first_rec;
3095 cplength += count;
3096 datasize += count*sizeof(struct LO_eckd_data);
3097 }
3098 /* Allocate the ccw request. */
3099 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3100 startdev, blk_mq_rq_to_pdu(req));
3101 if (IS_ERR(cqr))
3102 return cqr;
3103 ccw = cqr->cpaddr;
3104 /* First ccw is define extent or prefix. */
3105 if (use_prefix) {
3106 if (prefix(ccw++, cqr->data, first_trk,
3107 last_trk, cmd, basedev, startdev) == -EAGAIN) {
3108 /* Clock not in sync and XRC is enabled.
3109 * Try again later.
3110 */
3111 dasd_sfree_request(cqr, startdev);
3112 return ERR_PTR(-EAGAIN);
3113 }
3114 idaws = (unsigned long *) (cqr->data +
3115 sizeof(struct PFX_eckd_data));
3116 } else {
3117 if (define_extent(ccw++, cqr->data, first_trk,
3118 last_trk, cmd, basedev, 0) == -EAGAIN) {
3119 /* Clock not in sync and XRC is enabled.
3120 * Try again later.
3121 */
3122 dasd_sfree_request(cqr, startdev);
3123 return ERR_PTR(-EAGAIN);
3124 }
3125 idaws = (unsigned long *) (cqr->data +
3126 sizeof(struct DE_eckd_data));
3127 }
3128 /* Build locate_record+read/write/ccws. */
3129 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3130 recid = first_rec;
3131 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3132 /* Only standard blocks so there is just one locate record. */
3133 ccw[-1].flags |= CCW_FLAG_CC;
3134 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3135 last_rec - recid + 1, cmd, basedev, blksize);
3136 }
3137 rq_for_each_segment(bv, req, iter) {
3138 dst = page_address(bv.bv_page) + bv.bv_offset;
3139 if (dasd_page_cache) {
3140 char *copy = kmem_cache_alloc(dasd_page_cache,
3141 GFP_DMA | __GFP_NOWARN);
3142 if (copy && rq_data_dir(req) == WRITE)
3143 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3144 if (copy)
3145 dst = copy + bv.bv_offset;
3146 }
3147 for (off = 0; off < bv.bv_len; off += blksize) {
3148 sector_t trkid = recid;
3149 unsigned int recoffs = sector_div(trkid, blk_per_trk);
3150 rcmd = cmd;
3151 count = blksize;
3152 /* Locate record for cdl special block ? */
3153 if (private->uses_cdl && recid < 2*blk_per_trk) {
3154 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3155 rcmd |= 0x8;
3156 count = dasd_eckd_cdl_reclen(recid);
3157 if (count < blksize &&
3158 rq_data_dir(req) == READ)
3159 memset(dst + count, 0xe5,
3160 blksize - count);
3161 }
3162 ccw[-1].flags |= CCW_FLAG_CC;
3163 locate_record(ccw++, LO_data++,
3164 trkid, recoffs + 1,
3165 1, rcmd, basedev, count);
3166 }
3167 /* Locate record for standard blocks ? */
3168 if (private->uses_cdl && recid == 2*blk_per_trk) {
3169 ccw[-1].flags |= CCW_FLAG_CC;
3170 locate_record(ccw++, LO_data++,
3171 trkid, recoffs + 1,
3172 last_rec - recid + 1,
3173 cmd, basedev, count);
3174 }
3175 /* Read/write ccw. */
3176 ccw[-1].flags |= CCW_FLAG_CC;
3177 ccw->cmd_code = rcmd;
3178 ccw->count = count;
3179 if (idal_is_needed(dst, blksize)) {
3180 ccw->cda = (__u32)(addr_t) idaws;
3181 ccw->flags = CCW_FLAG_IDA;
3182 idaws = idal_create_words(idaws, dst, blksize);
3183 } else {
3184 ccw->cda = (__u32)(addr_t) dst;
3185 ccw->flags = 0;
3186 }
3187 ccw++;
3188 dst += blksize;
3189 recid++;
3190 }
3191 }
3192 if (blk_noretry_request(req) ||
3193 block->base->features & DASD_FEATURE_FAILFAST)
3194 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3195 cqr->startdev = startdev;
3196 cqr->memdev = startdev;
3197 cqr->block = block;
3198 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3199 cqr->lpm = dasd_path_get_ppm(startdev);
3200 cqr->retries = startdev->default_retries;
3201 cqr->buildclk = get_tod_clock();
3202 cqr->status = DASD_CQR_FILLED;
3203 return cqr;
3204 }
3205
3206 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3207 struct dasd_device *startdev,
3208 struct dasd_block *block,
3209 struct request *req,
3210 sector_t first_rec,
3211 sector_t last_rec,
3212 sector_t first_trk,
3213 sector_t last_trk,
3214 unsigned int first_offs,
3215 unsigned int last_offs,
3216 unsigned int blk_per_trk,
3217 unsigned int blksize)
3218 {
3219 unsigned long *idaws;
3220 struct dasd_ccw_req *cqr;
3221 struct ccw1 *ccw;
3222 struct req_iterator iter;
3223 struct bio_vec bv;
3224 char *dst, *idaw_dst;
3225 unsigned int cidaw, cplength, datasize;
3226 unsigned int tlf;
3227 sector_t recid;
3228 unsigned char cmd;
3229 struct dasd_device *basedev;
3230 unsigned int trkcount, count, count_to_trk_end;
3231 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3232 unsigned char new_track, end_idaw;
3233 sector_t trkid;
3234 unsigned int recoffs;
3235
3236 basedev = block->base;
3237 if (rq_data_dir(req) == READ)
3238 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3239 else if (rq_data_dir(req) == WRITE)
3240 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3241 else
3242 return ERR_PTR(-EINVAL);
3243
3244 /* Track based I/O needs IDAWs for each page, and not just for
3245 * 64 bit addresses. We need additional idals for pages
3246 * that get filled from two tracks, so we use the number
3247 * of records as upper limit.
3248 */
3249 cidaw = last_rec - first_rec + 1;
3250 trkcount = last_trk - first_trk + 1;
3251
3252 /* 1x prefix + one read/write ccw per track */
3253 cplength = 1 + trkcount;
3254
3255 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3256
3257 /* Allocate the ccw request. */
3258 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3259 startdev, blk_mq_rq_to_pdu(req));
3260 if (IS_ERR(cqr))
3261 return cqr;
3262 ccw = cqr->cpaddr;
3263 /* transfer length factor: how many bytes to read from the last track */
3264 if (first_trk == last_trk)
3265 tlf = last_offs - first_offs + 1;
3266 else
3267 tlf = last_offs + 1;
3268 tlf *= blksize;
3269
3270 if (prefix_LRE(ccw++, cqr->data, first_trk,
3271 last_trk, cmd, basedev, startdev,
3272 1 /* format */, first_offs + 1,
3273 trkcount, blksize,
3274 tlf) == -EAGAIN) {
3275 /* Clock not in sync and XRC is enabled.
3276 * Try again later.
3277 */
3278 dasd_sfree_request(cqr, startdev);
3279 return ERR_PTR(-EAGAIN);
3280 }
3281
3282 /*
3283 * The translation of request into ccw programs must meet the
3284 * following conditions:
3285 * - all idaws but the first and the last must address full pages
3286 * (or 2K blocks on 31-bit)
3287 * - the scope of a ccw and it's idal ends with the track boundaries
3288 */
3289 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3290 recid = first_rec;
3291 new_track = 1;
3292 end_idaw = 0;
3293 len_to_track_end = 0;
3294 idaw_dst = NULL;
3295 idaw_len = 0;
3296 rq_for_each_segment(bv, req, iter) {
3297 dst = page_address(bv.bv_page) + bv.bv_offset;
3298 seg_len = bv.bv_len;
3299 while (seg_len) {
3300 if (new_track) {
3301 trkid = recid;
3302 recoffs = sector_div(trkid, blk_per_trk);
3303 count_to_trk_end = blk_per_trk - recoffs;
3304 count = min((last_rec - recid + 1),
3305 (sector_t)count_to_trk_end);
3306 len_to_track_end = count * blksize;
3307 ccw[-1].flags |= CCW_FLAG_CC;
3308 ccw->cmd_code = cmd;
3309 ccw->count = len_to_track_end;
3310 ccw->cda = (__u32)(addr_t)idaws;
3311 ccw->flags = CCW_FLAG_IDA;
3312 ccw++;
3313 recid += count;
3314 new_track = 0;
3315 /* first idaw for a ccw may start anywhere */
3316 if (!idaw_dst)
3317 idaw_dst = dst;
3318 }
3319 /* If we start a new idaw, we must make sure that it
3320 * starts on an IDA_BLOCK_SIZE boundary.
3321 * If we continue an idaw, we must make sure that the
3322 * current segment begins where the so far accumulated
3323 * idaw ends
3324 */
3325 if (!idaw_dst) {
3326 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3327 dasd_sfree_request(cqr, startdev);
3328 return ERR_PTR(-ERANGE);
3329 } else
3330 idaw_dst = dst;
3331 }
3332 if ((idaw_dst + idaw_len) != dst) {
3333 dasd_sfree_request(cqr, startdev);
3334 return ERR_PTR(-ERANGE);
3335 }
3336 part_len = min(seg_len, len_to_track_end);
3337 seg_len -= part_len;
3338 dst += part_len;
3339 idaw_len += part_len;
3340 len_to_track_end -= part_len;
3341 /* collected memory area ends on an IDA_BLOCK border,
3342 * -> create an idaw
3343 * idal_create_words will handle cases where idaw_len
3344 * is larger then IDA_BLOCK_SIZE
3345 */
3346 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3347 end_idaw = 1;
3348 /* We also need to end the idaw at track end */
3349 if (!len_to_track_end) {
3350 new_track = 1;
3351 end_idaw = 1;
3352 }
3353 if (end_idaw) {
3354 idaws = idal_create_words(idaws, idaw_dst,
3355 idaw_len);
3356 idaw_dst = NULL;
3357 idaw_len = 0;
3358 end_idaw = 0;
3359 }
3360 }
3361 }
3362
3363 if (blk_noretry_request(req) ||
3364 block->base->features & DASD_FEATURE_FAILFAST)
3365 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3366 cqr->startdev = startdev;
3367 cqr->memdev = startdev;
3368 cqr->block = block;
3369 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3370 cqr->lpm = dasd_path_get_ppm(startdev);
3371 cqr->retries = startdev->default_retries;
3372 cqr->buildclk = get_tod_clock();
3373 cqr->status = DASD_CQR_FILLED;
3374 return cqr;
3375 }
3376
3377 static int prepare_itcw(struct itcw *itcw,
3378 unsigned int trk, unsigned int totrk, int cmd,
3379 struct dasd_device *basedev,
3380 struct dasd_device *startdev,
3381 unsigned int rec_on_trk, int count,
3382 unsigned int blksize,
3383 unsigned int total_data_size,
3384 unsigned int tlf,
3385 unsigned int blk_per_trk)
3386 {
3387 struct PFX_eckd_data pfxdata;
3388 struct dasd_eckd_private *basepriv, *startpriv;
3389 struct DE_eckd_data *dedata;
3390 struct LRE_eckd_data *lredata;
3391 struct dcw *dcw;
3392
3393 u32 begcyl, endcyl;
3394 u16 heads, beghead, endhead;
3395 u8 pfx_cmd;
3396
3397 int rc = 0;
3398 int sector = 0;
3399 int dn, d;
3400
3401
3402 /* setup prefix data */
3403 basepriv = basedev->private;
3404 startpriv = startdev->private;
3405 dedata = &pfxdata.define_extent;
3406 lredata = &pfxdata.locate_record;
3407
3408 memset(&pfxdata, 0, sizeof(pfxdata));
3409 pfxdata.format = 1; /* PFX with LRE */
3410 pfxdata.base_address = basepriv->ned->unit_addr;
3411 pfxdata.base_lss = basepriv->ned->ID;
3412 pfxdata.validity.define_extent = 1;
3413
3414 /* private uid is kept up to date, conf_data may be outdated */
3415 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3416 pfxdata.validity.verify_base = 1;
3417
3418 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3419 pfxdata.validity.verify_base = 1;
3420 pfxdata.validity.hyper_pav = 1;
3421 }
3422
3423 switch (cmd) {
3424 case DASD_ECKD_CCW_READ_TRACK_DATA:
3425 dedata->mask.perm = 0x1;
3426 dedata->attributes.operation = basepriv->attrib.operation;
3427 dedata->blk_size = blksize;
3428 dedata->ga_extended |= 0x42;
3429 lredata->operation.orientation = 0x0;
3430 lredata->operation.operation = 0x0C;
3431 lredata->auxiliary.check_bytes = 0x01;
3432 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3433 break;
3434 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3435 dedata->mask.perm = 0x02;
3436 dedata->attributes.operation = basepriv->attrib.operation;
3437 dedata->blk_size = blksize;
3438 rc = set_timestamp(NULL, dedata, basedev);
3439 dedata->ga_extended |= 0x42;
3440 lredata->operation.orientation = 0x0;
3441 lredata->operation.operation = 0x3F;
3442 lredata->extended_operation = 0x23;
3443 lredata->auxiliary.check_bytes = 0x2;
3444 /*
3445 * If XRC is supported the System Time Stamp is set. The
3446 * validity of the time stamp must be reflected in the prefix
3447 * data as well.
3448 */
3449 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3450 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3451 pfx_cmd = DASD_ECKD_CCW_PFX;
3452 break;
3453 case DASD_ECKD_CCW_READ_COUNT_MT:
3454 dedata->mask.perm = 0x1;
3455 dedata->attributes.operation = DASD_BYPASS_CACHE;
3456 dedata->ga_extended |= 0x42;
3457 dedata->blk_size = blksize;
3458 lredata->operation.orientation = 0x2;
3459 lredata->operation.operation = 0x16;
3460 lredata->auxiliary.check_bytes = 0x01;
3461 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3462 break;
3463 default:
3464 DBF_DEV_EVENT(DBF_ERR, basedev,
3465 "prepare itcw, unknown opcode 0x%x", cmd);
3466 BUG();
3467 break;
3468 }
3469 if (rc)
3470 return rc;
3471
3472 dedata->attributes.mode = 0x3; /* ECKD */
3473
3474 heads = basepriv->rdc_data.trk_per_cyl;
3475 begcyl = trk / heads;
3476 beghead = trk % heads;
3477 endcyl = totrk / heads;
3478 endhead = totrk % heads;
3479
3480 /* check for sequential prestage - enhance cylinder range */
3481 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3482 dedata->attributes.operation == DASD_SEQ_ACCESS) {
3483
3484 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3485 endcyl += basepriv->attrib.nr_cyl;
3486 else
3487 endcyl = (basepriv->real_cyl - 1);
3488 }
3489
3490 set_ch_t(&dedata->beg_ext, begcyl, beghead);
3491 set_ch_t(&dedata->end_ext, endcyl, endhead);
3492
3493 dedata->ep_format = 0x20; /* records per track is valid */
3494 dedata->ep_rec_per_track = blk_per_trk;
3495
3496 if (rec_on_trk) {
3497 switch (basepriv->rdc_data.dev_type) {
3498 case 0x3390:
3499 dn = ceil_quot(blksize + 6, 232);
3500 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3501 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3502 break;
3503 case 0x3380:
3504 d = 7 + ceil_quot(blksize + 12, 32);
3505 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3506 break;
3507 }
3508 }
3509
3510 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3511 lredata->auxiliary.length_valid = 0;
3512 lredata->auxiliary.length_scope = 0;
3513 lredata->sector = 0xff;
3514 } else {
3515 lredata->auxiliary.length_valid = 1;
3516 lredata->auxiliary.length_scope = 1;
3517 lredata->sector = sector;
3518 }
3519 lredata->auxiliary.imbedded_ccw_valid = 1;
3520 lredata->length = tlf;
3521 lredata->imbedded_ccw = cmd;
3522 lredata->count = count;
3523 set_ch_t(&lredata->seek_addr, begcyl, beghead);
3524 lredata->search_arg.cyl = lredata->seek_addr.cyl;
3525 lredata->search_arg.head = lredata->seek_addr.head;
3526 lredata->search_arg.record = rec_on_trk;
3527
3528 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3529 &pfxdata, sizeof(pfxdata), total_data_size);
3530 return PTR_ERR_OR_ZERO(dcw);
3531 }
3532
3533 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3534 struct dasd_device *startdev,
3535 struct dasd_block *block,
3536 struct request *req,
3537 sector_t first_rec,
3538 sector_t last_rec,
3539 sector_t first_trk,
3540 sector_t last_trk,
3541 unsigned int first_offs,
3542 unsigned int last_offs,
3543 unsigned int blk_per_trk,
3544 unsigned int blksize)
3545 {
3546 struct dasd_ccw_req *cqr;
3547 struct req_iterator iter;
3548 struct bio_vec bv;
3549 char *dst;
3550 unsigned int trkcount, ctidaw;
3551 unsigned char cmd;
3552 struct dasd_device *basedev;
3553 unsigned int tlf;
3554 struct itcw *itcw;
3555 struct tidaw *last_tidaw = NULL;
3556 int itcw_op;
3557 size_t itcw_size;
3558 u8 tidaw_flags;
3559 unsigned int seg_len, part_len, len_to_track_end;
3560 unsigned char new_track;
3561 sector_t recid, trkid;
3562 unsigned int offs;
3563 unsigned int count, count_to_trk_end;
3564 int ret;
3565
3566 basedev = block->base;
3567 if (rq_data_dir(req) == READ) {
3568 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3569 itcw_op = ITCW_OP_READ;
3570 } else if (rq_data_dir(req) == WRITE) {
3571 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3572 itcw_op = ITCW_OP_WRITE;
3573 } else
3574 return ERR_PTR(-EINVAL);
3575
3576 /* trackbased I/O needs address all memory via TIDAWs,
3577 * not just for 64 bit addresses. This allows us to map
3578 * each segment directly to one tidaw.
3579 * In the case of write requests, additional tidaws may
3580 * be needed when a segment crosses a track boundary.
3581 */
3582 trkcount = last_trk - first_trk + 1;
3583 ctidaw = 0;
3584 rq_for_each_segment(bv, req, iter) {
3585 ++ctidaw;
3586 }
3587 if (rq_data_dir(req) == WRITE)
3588 ctidaw += (last_trk - first_trk);
3589
3590 /* Allocate the ccw request. */
3591 itcw_size = itcw_calc_size(0, ctidaw, 0);
3592 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
3593 blk_mq_rq_to_pdu(req));
3594 if (IS_ERR(cqr))
3595 return cqr;
3596
3597 /* transfer length factor: how many bytes to read from the last track */
3598 if (first_trk == last_trk)
3599 tlf = last_offs - first_offs + 1;
3600 else
3601 tlf = last_offs + 1;
3602 tlf *= blksize;
3603
3604 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3605 if (IS_ERR(itcw)) {
3606 ret = -EINVAL;
3607 goto out_error;
3608 }
3609 cqr->cpaddr = itcw_get_tcw(itcw);
3610 if (prepare_itcw(itcw, first_trk, last_trk,
3611 cmd, basedev, startdev,
3612 first_offs + 1,
3613 trkcount, blksize,
3614 (last_rec - first_rec + 1) * blksize,
3615 tlf, blk_per_trk) == -EAGAIN) {
3616 /* Clock not in sync and XRC is enabled.
3617 * Try again later.
3618 */
3619 ret = -EAGAIN;
3620 goto out_error;
3621 }
3622 len_to_track_end = 0;
3623 /*
3624 * A tidaw can address 4k of memory, but must not cross page boundaries
3625 * We can let the block layer handle this by setting
3626 * blk_queue_segment_boundary to page boundaries and
3627 * blk_max_segment_size to page size when setting up the request queue.
3628 * For write requests, a TIDAW must not cross track boundaries, because
3629 * we have to set the CBC flag on the last tidaw for each track.
3630 */
3631 if (rq_data_dir(req) == WRITE) {
3632 new_track = 1;
3633 recid = first_rec;
3634 rq_for_each_segment(bv, req, iter) {
3635 dst = page_address(bv.bv_page) + bv.bv_offset;
3636 seg_len = bv.bv_len;
3637 while (seg_len) {
3638 if (new_track) {
3639 trkid = recid;
3640 offs = sector_div(trkid, blk_per_trk);
3641 count_to_trk_end = blk_per_trk - offs;
3642 count = min((last_rec - recid + 1),
3643 (sector_t)count_to_trk_end);
3644 len_to_track_end = count * blksize;
3645 recid += count;
3646 new_track = 0;
3647 }
3648 part_len = min(seg_len, len_to_track_end);
3649 seg_len -= part_len;
3650 len_to_track_end -= part_len;
3651 /* We need to end the tidaw at track end */
3652 if (!len_to_track_end) {
3653 new_track = 1;
3654 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3655 } else
3656 tidaw_flags = 0;
3657 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3658 dst, part_len);
3659 if (IS_ERR(last_tidaw)) {
3660 ret = -EINVAL;
3661 goto out_error;
3662 }
3663 dst += part_len;
3664 }
3665 }
3666 } else {
3667 rq_for_each_segment(bv, req, iter) {
3668 dst = page_address(bv.bv_page) + bv.bv_offset;
3669 last_tidaw = itcw_add_tidaw(itcw, 0x00,
3670 dst, bv.bv_len);
3671 if (IS_ERR(last_tidaw)) {
3672 ret = -EINVAL;
3673 goto out_error;
3674 }
3675 }
3676 }
3677 last_tidaw->flags |= TIDAW_FLAGS_LAST;
3678 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3679 itcw_finalize(itcw);
3680
3681 if (blk_noretry_request(req) ||
3682 block->base->features & DASD_FEATURE_FAILFAST)
3683 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3684 cqr->cpmode = 1;
3685 cqr->startdev = startdev;
3686 cqr->memdev = startdev;
3687 cqr->block = block;
3688 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3689 cqr->lpm = dasd_path_get_ppm(startdev);
3690 cqr->retries = startdev->default_retries;
3691 cqr->buildclk = get_tod_clock();
3692 cqr->status = DASD_CQR_FILLED;
3693 return cqr;
3694 out_error:
3695 dasd_sfree_request(cqr, startdev);
3696 return ERR_PTR(ret);
3697 }
3698
3699 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3700 struct dasd_block *block,
3701 struct request *req)
3702 {
3703 int cmdrtd, cmdwtd;
3704 int use_prefix;
3705 int fcx_multitrack;
3706 struct dasd_eckd_private *private;
3707 struct dasd_device *basedev;
3708 sector_t first_rec, last_rec;
3709 sector_t first_trk, last_trk;
3710 unsigned int first_offs, last_offs;
3711 unsigned int blk_per_trk, blksize;
3712 int cdlspecial;
3713 unsigned int data_size;
3714 struct dasd_ccw_req *cqr;
3715
3716 basedev = block->base;
3717 private = basedev->private;
3718
3719 /* Calculate number of blocks/records per track. */
3720 blksize = block->bp_block;
3721 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3722 if (blk_per_trk == 0)
3723 return ERR_PTR(-EINVAL);
3724 /* Calculate record id of first and last block. */
3725 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3726 first_offs = sector_div(first_trk, blk_per_trk);
3727 last_rec = last_trk =
3728 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3729 last_offs = sector_div(last_trk, blk_per_trk);
3730 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3731
3732 fcx_multitrack = private->features.feature[40] & 0x20;
3733 data_size = blk_rq_bytes(req);
3734 if (data_size % blksize)
3735 return ERR_PTR(-EINVAL);
3736 /* tpm write request add CBC data on each track boundary */
3737 if (rq_data_dir(req) == WRITE)
3738 data_size += (last_trk - first_trk) * 4;
3739
3740 /* is read track data and write track data in command mode supported? */
3741 cmdrtd = private->features.feature[9] & 0x20;
3742 cmdwtd = private->features.feature[12] & 0x40;
3743 use_prefix = private->features.feature[8] & 0x01;
3744
3745 cqr = NULL;
3746 if (cdlspecial || dasd_page_cache) {
3747 /* do nothing, just fall through to the cmd mode single case */
3748 } else if ((data_size <= private->fcx_max_data)
3749 && (fcx_multitrack || (first_trk == last_trk))) {
3750 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3751 first_rec, last_rec,
3752 first_trk, last_trk,
3753 first_offs, last_offs,
3754 blk_per_trk, blksize);
3755 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3756 (PTR_ERR(cqr) != -ENOMEM))
3757 cqr = NULL;
3758 } else if (use_prefix &&
3759 (((rq_data_dir(req) == READ) && cmdrtd) ||
3760 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3761 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3762 first_rec, last_rec,
3763 first_trk, last_trk,
3764 first_offs, last_offs,
3765 blk_per_trk, blksize);
3766 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3767 (PTR_ERR(cqr) != -ENOMEM))
3768 cqr = NULL;
3769 }
3770 if (!cqr)
3771 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3772 first_rec, last_rec,
3773 first_trk, last_trk,
3774 first_offs, last_offs,
3775 blk_per_trk, blksize);
3776 return cqr;
3777 }
3778
3779 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3780 struct dasd_block *block,
3781 struct request *req)
3782 {
3783 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3784 unsigned int seg_len, len_to_track_end;
3785 unsigned int cidaw, cplength, datasize;
3786 sector_t first_trk, last_trk, sectors;
3787 struct dasd_eckd_private *base_priv;
3788 struct dasd_device *basedev;
3789 struct req_iterator iter;
3790 struct dasd_ccw_req *cqr;
3791 unsigned int first_offs;
3792 unsigned int trkcount;
3793 unsigned long *idaws;
3794 unsigned int size;
3795 unsigned char cmd;
3796 struct bio_vec bv;
3797 struct ccw1 *ccw;
3798 int use_prefix;
3799 void *data;
3800 char *dst;
3801
3802 /*
3803 * raw track access needs to be mutiple of 64k and on 64k boundary
3804 * For read requests we can fix an incorrect alignment by padding
3805 * the request with dummy pages.
3806 */
3807 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3808 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3809 DASD_RAW_SECTORS_PER_TRACK;
3810 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3811 DASD_RAW_SECTORS_PER_TRACK;
3812 basedev = block->base;
3813 if ((start_padding_sectors || end_padding_sectors) &&
3814 (rq_data_dir(req) == WRITE)) {
3815 DBF_DEV_EVENT(DBF_ERR, basedev,
3816 "raw write not track aligned (%lu,%lu) req %p",
3817 start_padding_sectors, end_padding_sectors, req);
3818 return ERR_PTR(-EINVAL);
3819 }
3820
3821 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3822 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3823 DASD_RAW_SECTORS_PER_TRACK;
3824 trkcount = last_trk - first_trk + 1;
3825 first_offs = 0;
3826
3827 if (rq_data_dir(req) == READ)
3828 cmd = DASD_ECKD_CCW_READ_TRACK;
3829 else if (rq_data_dir(req) == WRITE)
3830 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3831 else
3832 return ERR_PTR(-EINVAL);
3833
3834 /*
3835 * Raw track based I/O needs IDAWs for each page,
3836 * and not just for 64 bit addresses.
3837 */
3838 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3839
3840 /*
3841 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3842 * of extended parameter. This is needed for write full track.
3843 */
3844 base_priv = basedev->private;
3845 use_prefix = base_priv->features.feature[8] & 0x01;
3846 if (use_prefix) {
3847 cplength = 1 + trkcount;
3848 size = sizeof(struct PFX_eckd_data) + 2;
3849 } else {
3850 cplength = 2 + trkcount;
3851 size = sizeof(struct DE_eckd_data) +
3852 sizeof(struct LRE_eckd_data) + 2;
3853 }
3854 size = ALIGN(size, 8);
3855
3856 datasize = size + cidaw * sizeof(unsigned long);
3857
3858 /* Allocate the ccw request. */
3859 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3860 datasize, startdev, blk_mq_rq_to_pdu(req));
3861 if (IS_ERR(cqr))
3862 return cqr;
3863
3864 ccw = cqr->cpaddr;
3865 data = cqr->data;
3866
3867 if (use_prefix) {
3868 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3869 startdev, 1, first_offs + 1, trkcount, 0, 0);
3870 } else {
3871 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3872 ccw[-1].flags |= CCW_FLAG_CC;
3873
3874 data += sizeof(struct DE_eckd_data);
3875 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
3876 trkcount, cmd, basedev, 0, 0);
3877 }
3878
3879 idaws = (unsigned long *)(cqr->data + size);
3880 len_to_track_end = 0;
3881 if (start_padding_sectors) {
3882 ccw[-1].flags |= CCW_FLAG_CC;
3883 ccw->cmd_code = cmd;
3884 /* maximum 3390 track size */
3885 ccw->count = 57326;
3886 /* 64k map to one track */
3887 len_to_track_end = 65536 - start_padding_sectors * 512;
3888 ccw->cda = (__u32)(addr_t)idaws;
3889 ccw->flags |= CCW_FLAG_IDA;
3890 ccw->flags |= CCW_FLAG_SLI;
3891 ccw++;
3892 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3893 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3894 }
3895 rq_for_each_segment(bv, req, iter) {
3896 dst = page_address(bv.bv_page) + bv.bv_offset;
3897 seg_len = bv.bv_len;
3898 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3899 memset(dst, 0, seg_len);
3900 if (!len_to_track_end) {
3901 ccw[-1].flags |= CCW_FLAG_CC;
3902 ccw->cmd_code = cmd;
3903 /* maximum 3390 track size */
3904 ccw->count = 57326;
3905 /* 64k map to one track */
3906 len_to_track_end = 65536;
3907 ccw->cda = (__u32)(addr_t)idaws;
3908 ccw->flags |= CCW_FLAG_IDA;
3909 ccw->flags |= CCW_FLAG_SLI;
3910 ccw++;
3911 }
3912 len_to_track_end -= seg_len;
3913 idaws = idal_create_words(idaws, dst, seg_len);
3914 }
3915 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3916 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3917 if (blk_noretry_request(req) ||
3918 block->base->features & DASD_FEATURE_FAILFAST)
3919 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3920 cqr->startdev = startdev;
3921 cqr->memdev = startdev;
3922 cqr->block = block;
3923 cqr->expires = startdev->default_expires * HZ;
3924 cqr->lpm = dasd_path_get_ppm(startdev);
3925 cqr->retries = startdev->default_retries;
3926 cqr->buildclk = get_tod_clock();
3927 cqr->status = DASD_CQR_FILLED;
3928
3929 return cqr;
3930 }
3931
3932
3933 static int
3934 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3935 {
3936 struct dasd_eckd_private *private;
3937 struct ccw1 *ccw;
3938 struct req_iterator iter;
3939 struct bio_vec bv;
3940 char *dst, *cda;
3941 unsigned int blksize, blk_per_trk, off;
3942 sector_t recid;
3943 int status;
3944
3945 if (!dasd_page_cache)
3946 goto out;
3947 private = cqr->block->base->private;
3948 blksize = cqr->block->bp_block;
3949 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3950 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3951 ccw = cqr->cpaddr;
3952 /* Skip over define extent & locate record. */
3953 ccw++;
3954 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3955 ccw++;
3956 rq_for_each_segment(bv, req, iter) {
3957 dst = page_address(bv.bv_page) + bv.bv_offset;
3958 for (off = 0; off < bv.bv_len; off += blksize) {
3959 /* Skip locate record. */
3960 if (private->uses_cdl && recid <= 2*blk_per_trk)
3961 ccw++;
3962 if (dst) {
3963 if (ccw->flags & CCW_FLAG_IDA)
3964 cda = *((char **)((addr_t) ccw->cda));
3965 else
3966 cda = (char *)((addr_t) ccw->cda);
3967 if (dst != cda) {
3968 if (rq_data_dir(req) == READ)
3969 memcpy(dst, cda, bv.bv_len);
3970 kmem_cache_free(dasd_page_cache,
3971 (void *)((addr_t)cda & PAGE_MASK));
3972 }
3973 dst = NULL;
3974 }
3975 ccw++;
3976 recid++;
3977 }
3978 }
3979 out:
3980 status = cqr->status == DASD_CQR_DONE;
3981 dasd_sfree_request(cqr, cqr->memdev);
3982 return status;
3983 }
3984
3985 /*
3986 * Modify ccw/tcw in cqr so it can be started on a base device.
3987 *
3988 * Note that this is not enough to restart the cqr!
3989 * Either reset cqr->startdev as well (summary unit check handling)
3990 * or restart via separate cqr (as in ERP handling).
3991 */
3992 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3993 {
3994 struct ccw1 *ccw;
3995 struct PFX_eckd_data *pfxdata;
3996 struct tcw *tcw;
3997 struct tccb *tccb;
3998 struct dcw *dcw;
3999
4000 if (cqr->cpmode == 1) {
4001 tcw = cqr->cpaddr;
4002 tccb = tcw_get_tccb(tcw);
4003 dcw = (struct dcw *)&tccb->tca[0];
4004 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4005 pfxdata->validity.verify_base = 0;
4006 pfxdata->validity.hyper_pav = 0;
4007 } else {
4008 ccw = cqr->cpaddr;
4009 pfxdata = cqr->data;
4010 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4011 pfxdata->validity.verify_base = 0;
4012 pfxdata->validity.hyper_pav = 0;
4013 }
4014 }
4015 }
4016
4017 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4018
4019 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4020 struct dasd_block *block,
4021 struct request *req)
4022 {
4023 struct dasd_eckd_private *private;
4024 struct dasd_device *startdev;
4025 unsigned long flags;
4026 struct dasd_ccw_req *cqr;
4027
4028 startdev = dasd_alias_get_start_dev(base);
4029 if (!startdev)
4030 startdev = base;
4031 private = startdev->private;
4032 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4033 return ERR_PTR(-EBUSY);
4034
4035 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4036 private->count++;
4037 if ((base->features & DASD_FEATURE_USERAW))
4038 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4039 else
4040 cqr = dasd_eckd_build_cp(startdev, block, req);
4041 if (IS_ERR(cqr))
4042 private->count--;
4043 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4044 return cqr;
4045 }
4046
4047 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4048 struct request *req)
4049 {
4050 struct dasd_eckd_private *private;
4051 unsigned long flags;
4052
4053 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4054 private = cqr->memdev->private;
4055 private->count--;
4056 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4057 return dasd_eckd_free_cp(cqr, req);
4058 }
4059
4060 static int
4061 dasd_eckd_fill_info(struct dasd_device * device,
4062 struct dasd_information2_t * info)
4063 {
4064 struct dasd_eckd_private *private = device->private;
4065
4066 info->label_block = 2;
4067 info->FBA_layout = private->uses_cdl ? 0 : 1;
4068 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4069 info->characteristics_size = sizeof(private->rdc_data);
4070 memcpy(info->characteristics, &private->rdc_data,
4071 sizeof(private->rdc_data));
4072 info->confdata_size = min((unsigned long)private->conf_len,
4073 sizeof(info->configuration_data));
4074 memcpy(info->configuration_data, private->conf_data,
4075 info->confdata_size);
4076 return 0;
4077 }
4078
4079 /*
4080 * SECTION: ioctl functions for eckd devices.
4081 */
4082
4083 /*
4084 * Release device ioctl.
4085 * Buils a channel programm to releases a prior reserved
4086 * (see dasd_eckd_reserve) device.
4087 */
4088 static int
4089 dasd_eckd_release(struct dasd_device *device)
4090 {
4091 struct dasd_ccw_req *cqr;
4092 int rc;
4093 struct ccw1 *ccw;
4094 int useglobal;
4095
4096 if (!capable(CAP_SYS_ADMIN))
4097 return -EACCES;
4098
4099 useglobal = 0;
4100 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4101 if (IS_ERR(cqr)) {
4102 mutex_lock(&dasd_reserve_mutex);
4103 useglobal = 1;
4104 cqr = &dasd_reserve_req->cqr;
4105 memset(cqr, 0, sizeof(*cqr));
4106 memset(&dasd_reserve_req->ccw, 0,
4107 sizeof(dasd_reserve_req->ccw));
4108 cqr->cpaddr = &dasd_reserve_req->ccw;
4109 cqr->data = &dasd_reserve_req->data;
4110 cqr->magic = DASD_ECKD_MAGIC;
4111 }
4112 ccw = cqr->cpaddr;
4113 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4114 ccw->flags |= CCW_FLAG_SLI;
4115 ccw->count = 32;
4116 ccw->cda = (__u32)(addr_t) cqr->data;
4117 cqr->startdev = device;
4118 cqr->memdev = device;
4119 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4120 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4121 cqr->retries = 2; /* set retry counter to enable basic ERP */
4122 cqr->expires = 2 * HZ;
4123 cqr->buildclk = get_tod_clock();
4124 cqr->status = DASD_CQR_FILLED;
4125
4126 rc = dasd_sleep_on_immediatly(cqr);
4127 if (!rc)
4128 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4129
4130 if (useglobal)
4131 mutex_unlock(&dasd_reserve_mutex);
4132 else
4133 dasd_sfree_request(cqr, cqr->memdev);
4134 return rc;
4135 }
4136
4137 /*
4138 * Reserve device ioctl.
4139 * Options are set to 'synchronous wait for interrupt' and
4140 * 'timeout the request'. This leads to a terminate IO if
4141 * the interrupt is outstanding for a certain time.
4142 */
4143 static int
4144 dasd_eckd_reserve(struct dasd_device *device)
4145 {
4146 struct dasd_ccw_req *cqr;
4147 int rc;
4148 struct ccw1 *ccw;
4149 int useglobal;
4150
4151 if (!capable(CAP_SYS_ADMIN))
4152 return -EACCES;
4153
4154 useglobal = 0;
4155 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4156 if (IS_ERR(cqr)) {
4157 mutex_lock(&dasd_reserve_mutex);
4158 useglobal = 1;
4159 cqr = &dasd_reserve_req->cqr;
4160 memset(cqr, 0, sizeof(*cqr));
4161 memset(&dasd_reserve_req->ccw, 0,
4162 sizeof(dasd_reserve_req->ccw));
4163 cqr->cpaddr = &dasd_reserve_req->ccw;
4164 cqr->data = &dasd_reserve_req->data;
4165 cqr->magic = DASD_ECKD_MAGIC;
4166 }
4167 ccw = cqr->cpaddr;
4168 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4169 ccw->flags |= CCW_FLAG_SLI;
4170 ccw->count = 32;
4171 ccw->cda = (__u32)(addr_t) cqr->data;
4172 cqr->startdev = device;
4173 cqr->memdev = device;
4174 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4175 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4176 cqr->retries = 2; /* set retry counter to enable basic ERP */
4177 cqr->expires = 2 * HZ;
4178 cqr->buildclk = get_tod_clock();
4179 cqr->status = DASD_CQR_FILLED;
4180
4181 rc = dasd_sleep_on_immediatly(cqr);
4182 if (!rc)
4183 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4184
4185 if (useglobal)
4186 mutex_unlock(&dasd_reserve_mutex);
4187 else
4188 dasd_sfree_request(cqr, cqr->memdev);
4189 return rc;
4190 }
4191
4192 /*
4193 * Steal lock ioctl - unconditional reserve device.
4194 * Buils a channel programm to break a device's reservation.
4195 * (unconditional reserve)
4196 */
4197 static int
4198 dasd_eckd_steal_lock(struct dasd_device *device)
4199 {
4200 struct dasd_ccw_req *cqr;
4201 int rc;
4202 struct ccw1 *ccw;
4203 int useglobal;
4204
4205 if (!capable(CAP_SYS_ADMIN))
4206 return -EACCES;
4207
4208 useglobal = 0;
4209 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4210 if (IS_ERR(cqr)) {
4211 mutex_lock(&dasd_reserve_mutex);
4212 useglobal = 1;
4213 cqr = &dasd_reserve_req->cqr;
4214 memset(cqr, 0, sizeof(*cqr));
4215 memset(&dasd_reserve_req->ccw, 0,
4216 sizeof(dasd_reserve_req->ccw));
4217 cqr->cpaddr = &dasd_reserve_req->ccw;
4218 cqr->data = &dasd_reserve_req->data;
4219 cqr->magic = DASD_ECKD_MAGIC;
4220 }
4221 ccw = cqr->cpaddr;
4222 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4223 ccw->flags |= CCW_FLAG_SLI;
4224 ccw->count = 32;
4225 ccw->cda = (__u32)(addr_t) cqr->data;
4226 cqr->startdev = device;
4227 cqr->memdev = device;
4228 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4229 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4230 cqr->retries = 2; /* set retry counter to enable basic ERP */
4231 cqr->expires = 2 * HZ;
4232 cqr->buildclk = get_tod_clock();
4233 cqr->status = DASD_CQR_FILLED;
4234
4235 rc = dasd_sleep_on_immediatly(cqr);
4236 if (!rc)
4237 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4238
4239 if (useglobal)
4240 mutex_unlock(&dasd_reserve_mutex);
4241 else
4242 dasd_sfree_request(cqr, cqr->memdev);
4243 return rc;
4244 }
4245
4246 /*
4247 * SNID - Sense Path Group ID
4248 * This ioctl may be used in situations where I/O is stalled due to
4249 * a reserve, so if the normal dasd_smalloc_request fails, we use the
4250 * preallocated dasd_reserve_req.
4251 */
4252 static int dasd_eckd_snid(struct dasd_device *device,
4253 void __user *argp)
4254 {
4255 struct dasd_ccw_req *cqr;
4256 int rc;
4257 struct ccw1 *ccw;
4258 int useglobal;
4259 struct dasd_snid_ioctl_data usrparm;
4260
4261 if (!capable(CAP_SYS_ADMIN))
4262 return -EACCES;
4263
4264 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4265 return -EFAULT;
4266
4267 useglobal = 0;
4268 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4269 sizeof(struct dasd_snid_data), device,
4270 NULL);
4271 if (IS_ERR(cqr)) {
4272 mutex_lock(&dasd_reserve_mutex);
4273 useglobal = 1;
4274 cqr = &dasd_reserve_req->cqr;
4275 memset(cqr, 0, sizeof(*cqr));
4276 memset(&dasd_reserve_req->ccw, 0,
4277 sizeof(dasd_reserve_req->ccw));
4278 cqr->cpaddr = &dasd_reserve_req->ccw;
4279 cqr->data = &dasd_reserve_req->data;
4280 cqr->magic = DASD_ECKD_MAGIC;
4281 }
4282 ccw = cqr->cpaddr;
4283 ccw->cmd_code = DASD_ECKD_CCW_SNID;
4284 ccw->flags |= CCW_FLAG_SLI;
4285 ccw->count = 12;
4286 ccw->cda = (__u32)(addr_t) cqr->data;
4287 cqr->startdev = device;
4288 cqr->memdev = device;
4289 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4290 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4291 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4292 cqr->retries = 5;
4293 cqr->expires = 10 * HZ;
4294 cqr->buildclk = get_tod_clock();
4295 cqr->status = DASD_CQR_FILLED;
4296 cqr->lpm = usrparm.path_mask;
4297
4298 rc = dasd_sleep_on_immediatly(cqr);
4299 /* verify that I/O processing didn't modify the path mask */
4300 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4301 rc = -EIO;
4302 if (!rc) {
4303 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4304 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4305 rc = -EFAULT;
4306 }
4307
4308 if (useglobal)
4309 mutex_unlock(&dasd_reserve_mutex);
4310 else
4311 dasd_sfree_request(cqr, cqr->memdev);
4312 return rc;
4313 }
4314
4315 /*
4316 * Read performance statistics
4317 */
4318 static int
4319 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4320 {
4321 struct dasd_psf_prssd_data *prssdp;
4322 struct dasd_rssd_perf_stats_t *stats;
4323 struct dasd_ccw_req *cqr;
4324 struct ccw1 *ccw;
4325 int rc;
4326
4327 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4328 (sizeof(struct dasd_psf_prssd_data) +
4329 sizeof(struct dasd_rssd_perf_stats_t)),
4330 device, NULL);
4331 if (IS_ERR(cqr)) {
4332 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4333 "Could not allocate initialization request");
4334 return PTR_ERR(cqr);
4335 }
4336 cqr->startdev = device;
4337 cqr->memdev = device;
4338 cqr->retries = 0;
4339 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4340 cqr->expires = 10 * HZ;
4341
4342 /* Prepare for Read Subsystem Data */
4343 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4344 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4345 prssdp->order = PSF_ORDER_PRSSD;
4346 prssdp->suborder = 0x01; /* Performance Statistics */
4347 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
4348
4349 ccw = cqr->cpaddr;
4350 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4351 ccw->count = sizeof(struct dasd_psf_prssd_data);
4352 ccw->flags |= CCW_FLAG_CC;
4353 ccw->cda = (__u32)(addr_t) prssdp;
4354
4355 /* Read Subsystem Data - Performance Statistics */
4356 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4357 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4358
4359 ccw++;
4360 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4361 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4362 ccw->cda = (__u32)(addr_t) stats;
4363
4364 cqr->buildclk = get_tod_clock();
4365 cqr->status = DASD_CQR_FILLED;
4366 rc = dasd_sleep_on(cqr);
4367 if (rc == 0) {
4368 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4369 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4370 if (copy_to_user(argp, stats,
4371 sizeof(struct dasd_rssd_perf_stats_t)))
4372 rc = -EFAULT;
4373 }
4374 dasd_sfree_request(cqr, cqr->memdev);
4375 return rc;
4376 }
4377
4378 /*
4379 * Get attributes (cache operations)
4380 * Returnes the cache attributes used in Define Extend (DE).
4381 */
4382 static int
4383 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4384 {
4385 struct dasd_eckd_private *private = device->private;
4386 struct attrib_data_t attrib = private->attrib;
4387 int rc;
4388
4389 if (!capable(CAP_SYS_ADMIN))
4390 return -EACCES;
4391 if (!argp)
4392 return -EINVAL;
4393
4394 rc = 0;
4395 if (copy_to_user(argp, (long *) &attrib,
4396 sizeof(struct attrib_data_t)))
4397 rc = -EFAULT;
4398
4399 return rc;
4400 }
4401
4402 /*
4403 * Set attributes (cache operations)
4404 * Stores the attributes for cache operation to be used in Define Extend (DE).
4405 */
4406 static int
4407 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4408 {
4409 struct dasd_eckd_private *private = device->private;
4410 struct attrib_data_t attrib;
4411
4412 if (!capable(CAP_SYS_ADMIN))
4413 return -EACCES;
4414 if (!argp)
4415 return -EINVAL;
4416
4417 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4418 return -EFAULT;
4419 private->attrib = attrib;
4420
4421 dev_info(&device->cdev->dev,
4422 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4423 private->attrib.operation, private->attrib.nr_cyl);
4424 return 0;
4425 }
4426
4427 /*
4428 * Issue syscall I/O to EMC Symmetrix array.
4429 * CCWs are PSF and RSSD
4430 */
4431 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4432 {
4433 struct dasd_symmio_parms usrparm;
4434 char *psf_data, *rssd_result;
4435 struct dasd_ccw_req *cqr;
4436 struct ccw1 *ccw;
4437 char psf0, psf1;
4438 int rc;
4439
4440 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4441 return -EACCES;
4442 psf0 = psf1 = 0;
4443
4444 /* Copy parms from caller */
4445 rc = -EFAULT;
4446 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4447 goto out;
4448 if (is_compat_task()) {
4449 /* Make sure pointers are sane even on 31 bit. */
4450 rc = -EINVAL;
4451 if ((usrparm.psf_data >> 32) != 0)
4452 goto out;
4453 if ((usrparm.rssd_result >> 32) != 0)
4454 goto out;
4455 usrparm.psf_data &= 0x7fffffffULL;
4456 usrparm.rssd_result &= 0x7fffffffULL;
4457 }
4458 /* at least 2 bytes are accessed and should be allocated */
4459 if (usrparm.psf_data_len < 2) {
4460 DBF_DEV_EVENT(DBF_WARNING, device,
4461 "Symmetrix ioctl invalid data length %d",
4462 usrparm.psf_data_len);
4463 rc = -EINVAL;
4464 goto out;
4465 }
4466 /* alloc I/O data area */
4467 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4468 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4469 if (!psf_data || !rssd_result) {
4470 rc = -ENOMEM;
4471 goto out_free;
4472 }
4473
4474 /* get syscall header from user space */
4475 rc = -EFAULT;
4476 if (copy_from_user(psf_data,
4477 (void __user *)(unsigned long) usrparm.psf_data,
4478 usrparm.psf_data_len))
4479 goto out_free;
4480 psf0 = psf_data[0];
4481 psf1 = psf_data[1];
4482
4483 /* setup CCWs for PSF + RSSD */
4484 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
4485 if (IS_ERR(cqr)) {
4486 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4487 "Could not allocate initialization request");
4488 rc = PTR_ERR(cqr);
4489 goto out_free;
4490 }
4491
4492 cqr->startdev = device;
4493 cqr->memdev = device;
4494 cqr->retries = 3;
4495 cqr->expires = 10 * HZ;
4496 cqr->buildclk = get_tod_clock();
4497 cqr->status = DASD_CQR_FILLED;
4498
4499 /* Build the ccws */
4500 ccw = cqr->cpaddr;
4501
4502 /* PSF ccw */
4503 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4504 ccw->count = usrparm.psf_data_len;
4505 ccw->flags |= CCW_FLAG_CC;
4506 ccw->cda = (__u32)(addr_t) psf_data;
4507
4508 ccw++;
4509
4510 /* RSSD ccw */
4511 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4512 ccw->count = usrparm.rssd_result_len;
4513 ccw->flags = CCW_FLAG_SLI ;
4514 ccw->cda = (__u32)(addr_t) rssd_result;
4515
4516 rc = dasd_sleep_on(cqr);
4517 if (rc)
4518 goto out_sfree;
4519
4520 rc = -EFAULT;
4521 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4522 rssd_result, usrparm.rssd_result_len))
4523 goto out_sfree;
4524 rc = 0;
4525
4526 out_sfree:
4527 dasd_sfree_request(cqr, cqr->memdev);
4528 out_free:
4529 kfree(rssd_result);
4530 kfree(psf_data);
4531 out:
4532 DBF_DEV_EVENT(DBF_WARNING, device,
4533 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4534 (int) psf0, (int) psf1, rc);
4535 return rc;
4536 }
4537
4538 static int
4539 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4540 {
4541 struct dasd_device *device = block->base;
4542
4543 switch (cmd) {
4544 case BIODASDGATTR:
4545 return dasd_eckd_get_attrib(device, argp);
4546 case BIODASDSATTR:
4547 return dasd_eckd_set_attrib(device, argp);
4548 case BIODASDPSRD:
4549 return dasd_eckd_performance(device, argp);
4550 case BIODASDRLSE:
4551 return dasd_eckd_release(device);
4552 case BIODASDRSRV:
4553 return dasd_eckd_reserve(device);
4554 case BIODASDSLCK:
4555 return dasd_eckd_steal_lock(device);
4556 case BIODASDSNID:
4557 return dasd_eckd_snid(device, argp);
4558 case BIODASDSYMMIO:
4559 return dasd_symm_io(device, argp);
4560 default:
4561 return -ENOTTY;
4562 }
4563 }
4564
4565 /*
4566 * Dump the range of CCWs into 'page' buffer
4567 * and return number of printed chars.
4568 */
4569 static int
4570 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4571 {
4572 int len, count;
4573 char *datap;
4574
4575 len = 0;
4576 while (from <= to) {
4577 len += sprintf(page + len, PRINTK_HEADER
4578 " CCW %p: %08X %08X DAT:",
4579 from, ((int *) from)[0], ((int *) from)[1]);
4580
4581 /* get pointer to data (consider IDALs) */
4582 if (from->flags & CCW_FLAG_IDA)
4583 datap = (char *) *((addr_t *) (addr_t) from->cda);
4584 else
4585 datap = (char *) ((addr_t) from->cda);
4586
4587 /* dump data (max 32 bytes) */
4588 for (count = 0; count < from->count && count < 32; count++) {
4589 if (count % 8 == 0) len += sprintf(page + len, " ");
4590 if (count % 4 == 0) len += sprintf(page + len, " ");
4591 len += sprintf(page + len, "%02x", datap[count]);
4592 }
4593 len += sprintf(page + len, "\n");
4594 from++;
4595 }
4596 return len;
4597 }
4598
4599 static void
4600 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4601 char *reason)
4602 {
4603 u64 *sense;
4604 u64 *stat;
4605
4606 sense = (u64 *) dasd_get_sense(irb);
4607 stat = (u64 *) &irb->scsw;
4608 if (sense) {
4609 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4610 "%016llx %016llx %016llx %016llx",
4611 reason, *stat, *((u32 *) (stat + 1)),
4612 sense[0], sense[1], sense[2], sense[3]);
4613 } else {
4614 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4615 reason, *stat, *((u32 *) (stat + 1)),
4616 "NO VALID SENSE");
4617 }
4618 }
4619
4620 /*
4621 * Print sense data and related channel program.
4622 * Parts are printed because printk buffer is only 1024 bytes.
4623 */
4624 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4625 struct dasd_ccw_req *req, struct irb *irb)
4626 {
4627 char *page;
4628 struct ccw1 *first, *last, *fail, *from, *to;
4629 int len, sl, sct;
4630
4631 page = (char *) get_zeroed_page(GFP_ATOMIC);
4632 if (page == NULL) {
4633 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4634 "No memory to dump sense data\n");
4635 return;
4636 }
4637 /* dump the sense data */
4638 len = sprintf(page, PRINTK_HEADER
4639 " I/O status report for device %s:\n",
4640 dev_name(&device->cdev->dev));
4641 len += sprintf(page + len, PRINTK_HEADER
4642 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4643 "CS:%02X RC:%d\n",
4644 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4645 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4646 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4647 req ? req->intrc : 0);
4648 len += sprintf(page + len, PRINTK_HEADER
4649 " device %s: Failing CCW: %p\n",
4650 dev_name(&device->cdev->dev),
4651 (void *) (addr_t) irb->scsw.cmd.cpa);
4652 if (irb->esw.esw0.erw.cons) {
4653 for (sl = 0; sl < 4; sl++) {
4654 len += sprintf(page + len, PRINTK_HEADER
4655 " Sense(hex) %2d-%2d:",
4656 (8 * sl), ((8 * sl) + 7));
4657
4658 for (sct = 0; sct < 8; sct++) {
4659 len += sprintf(page + len, " %02x",
4660 irb->ecw[8 * sl + sct]);
4661 }
4662 len += sprintf(page + len, "\n");
4663 }
4664
4665 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4666 /* 24 Byte Sense Data */
4667 sprintf(page + len, PRINTK_HEADER
4668 " 24 Byte: %x MSG %x, "
4669 "%s MSGb to SYSOP\n",
4670 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4671 irb->ecw[1] & 0x10 ? "" : "no");
4672 } else {
4673 /* 32 Byte Sense Data */
4674 sprintf(page + len, PRINTK_HEADER
4675 " 32 Byte: Format: %x "
4676 "Exception class %x\n",
4677 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4678 }
4679 } else {
4680 sprintf(page + len, PRINTK_HEADER
4681 " SORRY - NO VALID SENSE AVAILABLE\n");
4682 }
4683 printk(KERN_ERR "%s", page);
4684
4685 if (req) {
4686 /* req == NULL for unsolicited interrupts */
4687 /* dump the Channel Program (max 140 Bytes per line) */
4688 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4689 first = req->cpaddr;
4690 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4691 to = min(first + 6, last);
4692 len = sprintf(page, PRINTK_HEADER
4693 " Related CP in req: %p\n", req);
4694 dasd_eckd_dump_ccw_range(first, to, page + len);
4695 printk(KERN_ERR "%s", page);
4696
4697 /* print failing CCW area (maximum 4) */
4698 /* scsw->cda is either valid or zero */
4699 len = 0;
4700 from = ++to;
4701 fail = (struct ccw1 *)(addr_t)
4702 irb->scsw.cmd.cpa; /* failing CCW */
4703 if (from < fail - 2) {
4704 from = fail - 2; /* there is a gap - print header */
4705 len += sprintf(page, PRINTK_HEADER "......\n");
4706 }
4707 to = min(fail + 1, last);
4708 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4709
4710 /* print last CCWs (maximum 2) */
4711 from = max(from, ++to);
4712 if (from < last - 1) {
4713 from = last - 1; /* there is a gap - print header */
4714 len += sprintf(page + len, PRINTK_HEADER "......\n");
4715 }
4716 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4717 if (len > 0)
4718 printk(KERN_ERR "%s", page);
4719 }
4720 free_page((unsigned long) page);
4721 }
4722
4723
4724 /*
4725 * Print sense data from a tcw.
4726 */
4727 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4728 struct dasd_ccw_req *req, struct irb *irb)
4729 {
4730 char *page;
4731 int len, sl, sct, residual;
4732 struct tsb *tsb;
4733 u8 *sense, *rcq;
4734
4735 page = (char *) get_zeroed_page(GFP_ATOMIC);
4736 if (page == NULL) {
4737 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4738 "No memory to dump sense data");
4739 return;
4740 }
4741 /* dump the sense data */
4742 len = sprintf(page, PRINTK_HEADER
4743 " I/O status report for device %s:\n",
4744 dev_name(&device->cdev->dev));
4745 len += sprintf(page + len, PRINTK_HEADER
4746 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4747 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4748 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4749 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4750 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4751 irb->scsw.tm.fcxs,
4752 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4753 req ? req->intrc : 0);
4754 len += sprintf(page + len, PRINTK_HEADER
4755 " device %s: Failing TCW: %p\n",
4756 dev_name(&device->cdev->dev),
4757 (void *) (addr_t) irb->scsw.tm.tcw);
4758
4759 tsb = NULL;
4760 sense = NULL;
4761 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4762 tsb = tcw_get_tsb(
4763 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4764
4765 if (tsb) {
4766 len += sprintf(page + len, PRINTK_HEADER
4767 " tsb->length %d\n", tsb->length);
4768 len += sprintf(page + len, PRINTK_HEADER
4769 " tsb->flags %x\n", tsb->flags);
4770 len += sprintf(page + len, PRINTK_HEADER
4771 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4772 len += sprintf(page + len, PRINTK_HEADER
4773 " tsb->count %d\n", tsb->count);
4774 residual = tsb->count - 28;
4775 len += sprintf(page + len, PRINTK_HEADER
4776 " residual %d\n", residual);
4777
4778 switch (tsb->flags & 0x07) {
4779 case 1: /* tsa_iostat */
4780 len += sprintf(page + len, PRINTK_HEADER
4781 " tsb->tsa.iostat.dev_time %d\n",
4782 tsb->tsa.iostat.dev_time);
4783 len += sprintf(page + len, PRINTK_HEADER
4784 " tsb->tsa.iostat.def_time %d\n",
4785 tsb->tsa.iostat.def_time);
4786 len += sprintf(page + len, PRINTK_HEADER
4787 " tsb->tsa.iostat.queue_time %d\n",
4788 tsb->tsa.iostat.queue_time);
4789 len += sprintf(page + len, PRINTK_HEADER
4790 " tsb->tsa.iostat.dev_busy_time %d\n",
4791 tsb->tsa.iostat.dev_busy_time);
4792 len += sprintf(page + len, PRINTK_HEADER
4793 " tsb->tsa.iostat.dev_act_time %d\n",
4794 tsb->tsa.iostat.dev_act_time);
4795 sense = tsb->tsa.iostat.sense;
4796 break;
4797 case 2: /* ts_ddpc */
4798 len += sprintf(page + len, PRINTK_HEADER
4799 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4800 for (sl = 0; sl < 2; sl++) {
4801 len += sprintf(page + len, PRINTK_HEADER
4802 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4803 (8 * sl), ((8 * sl) + 7));
4804 rcq = tsb->tsa.ddpc.rcq;
4805 for (sct = 0; sct < 8; sct++) {
4806 len += sprintf(page + len, " %02x",
4807 rcq[8 * sl + sct]);
4808 }
4809 len += sprintf(page + len, "\n");
4810 }
4811 sense = tsb->tsa.ddpc.sense;
4812 break;
4813 case 3: /* tsa_intrg */
4814 len += sprintf(page + len, PRINTK_HEADER
4815 " tsb->tsa.intrg.: not supported yet\n");
4816 break;
4817 }
4818
4819 if (sense) {
4820 for (sl = 0; sl < 4; sl++) {
4821 len += sprintf(page + len, PRINTK_HEADER
4822 " Sense(hex) %2d-%2d:",
4823 (8 * sl), ((8 * sl) + 7));
4824 for (sct = 0; sct < 8; sct++) {
4825 len += sprintf(page + len, " %02x",
4826 sense[8 * sl + sct]);
4827 }
4828 len += sprintf(page + len, "\n");
4829 }
4830
4831 if (sense[27] & DASD_SENSE_BIT_0) {
4832 /* 24 Byte Sense Data */
4833 sprintf(page + len, PRINTK_HEADER
4834 " 24 Byte: %x MSG %x, "
4835 "%s MSGb to SYSOP\n",
4836 sense[7] >> 4, sense[7] & 0x0f,
4837 sense[1] & 0x10 ? "" : "no");
4838 } else {
4839 /* 32 Byte Sense Data */
4840 sprintf(page + len, PRINTK_HEADER
4841 " 32 Byte: Format: %x "
4842 "Exception class %x\n",
4843 sense[6] & 0x0f, sense[22] >> 4);
4844 }
4845 } else {
4846 sprintf(page + len, PRINTK_HEADER
4847 " SORRY - NO VALID SENSE AVAILABLE\n");
4848 }
4849 } else {
4850 sprintf(page + len, PRINTK_HEADER
4851 " SORRY - NO TSB DATA AVAILABLE\n");
4852 }
4853 printk(KERN_ERR "%s", page);
4854 free_page((unsigned long) page);
4855 }
4856
4857 static void dasd_eckd_dump_sense(struct dasd_device *device,
4858 struct dasd_ccw_req *req, struct irb *irb)
4859 {
4860 u8 *sense = dasd_get_sense(irb);
4861
4862 if (scsw_is_tm(&irb->scsw)) {
4863 /*
4864 * In some cases the 'File Protected' or 'Incorrect Length'
4865 * error might be expected and log messages shouldn't be written
4866 * then. Check if the according suppress bit is set.
4867 */
4868 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4869 test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4870 return;
4871 if (scsw_cstat(&irb->scsw) == 0x40 &&
4872 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4873 return;
4874
4875 dasd_eckd_dump_sense_tcw(device, req, irb);
4876 } else {
4877 /*
4878 * In some cases the 'Command Reject' or 'No Record Found'
4879 * error might be expected and log messages shouldn't be
4880 * written then. Check if the according suppress bit is set.
4881 */
4882 if (sense && sense[0] & SNS0_CMD_REJECT &&
4883 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4884 return;
4885
4886 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4887 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4888 return;
4889
4890 dasd_eckd_dump_sense_ccw(device, req, irb);
4891 }
4892 }
4893
4894 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4895 {
4896 /*
4897 * the device should be disconnected from our LCU structure
4898 * on restore we will reconnect it and reread LCU specific
4899 * information like PAV support that might have changed
4900 */
4901 dasd_alias_remove_device(device);
4902 dasd_alias_disconnect_device_from_lcu(device);
4903
4904 return 0;
4905 }
4906
4907 static int dasd_eckd_restore_device(struct dasd_device *device)
4908 {
4909 struct dasd_eckd_private *private = device->private;
4910 struct dasd_eckd_characteristics temp_rdc_data;
4911 int rc;
4912 struct dasd_uid temp_uid;
4913 unsigned long flags;
4914 unsigned long cqr_flags = 0;
4915
4916 /* Read Configuration Data */
4917 rc = dasd_eckd_read_conf(device);
4918 if (rc) {
4919 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4920 "Read configuration data failed, rc=%d", rc);
4921 goto out_err;
4922 }
4923
4924 dasd_eckd_get_uid(device, &temp_uid);
4925 /* Generate device unique id */
4926 rc = dasd_eckd_generate_uid(device);
4927 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4928 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4929 dev_err(&device->cdev->dev, "The UID of the DASD has "
4930 "changed\n");
4931 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4932 if (rc)
4933 goto out_err;
4934
4935 /* register lcu with alias handling, enable PAV if this is a new lcu */
4936 rc = dasd_alias_make_device_known_to_lcu(device);
4937 if (rc)
4938 goto out_err;
4939
4940 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4941 dasd_eckd_validate_server(device, cqr_flags);
4942
4943 /* RE-Read Configuration Data */
4944 rc = dasd_eckd_read_conf(device);
4945 if (rc) {
4946 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4947 "Read configuration data failed, rc=%d", rc);
4948 goto out_err2;
4949 }
4950
4951 /* Read Feature Codes */
4952 dasd_eckd_read_features(device);
4953
4954 /* Read Device Characteristics */
4955 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4956 &temp_rdc_data, 64);
4957 if (rc) {
4958 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4959 "Read device characteristic failed, rc=%d", rc);
4960 goto out_err2;
4961 }
4962 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4963 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4964 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4965
4966 /* add device to alias management */
4967 dasd_alias_add_device(device);
4968
4969 return 0;
4970
4971 out_err2:
4972 dasd_alias_disconnect_device_from_lcu(device);
4973 out_err:
4974 return -1;
4975 }
4976
4977 static int dasd_eckd_reload_device(struct dasd_device *device)
4978 {
4979 struct dasd_eckd_private *private = device->private;
4980 int rc, old_base;
4981 char print_uid[60];
4982 struct dasd_uid uid;
4983 unsigned long flags;
4984
4985 /*
4986 * remove device from alias handling to prevent new requests
4987 * from being scheduled on the wrong alias device
4988 */
4989 dasd_alias_remove_device(device);
4990
4991 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4992 old_base = private->uid.base_unit_addr;
4993 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4994
4995 /* Read Configuration Data */
4996 rc = dasd_eckd_read_conf(device);
4997 if (rc)
4998 goto out_err;
4999
5000 rc = dasd_eckd_generate_uid(device);
5001 if (rc)
5002 goto out_err;
5003 /*
5004 * update unit address configuration and
5005 * add device to alias management
5006 */
5007 dasd_alias_update_add_device(device);
5008
5009 dasd_eckd_get_uid(device, &uid);
5010
5011 if (old_base != uid.base_unit_addr) {
5012 if (strlen(uid.vduit) > 0)
5013 snprintf(print_uid, sizeof(print_uid),
5014 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5015 uid.ssid, uid.base_unit_addr, uid.vduit);
5016 else
5017 snprintf(print_uid, sizeof(print_uid),
5018 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5019 uid.ssid, uid.base_unit_addr);
5020
5021 dev_info(&device->cdev->dev,
5022 "An Alias device was reassigned to a new base device "
5023 "with UID: %s\n", print_uid);
5024 }
5025 return 0;
5026
5027 out_err:
5028 return -1;
5029 }
5030
5031 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5032 struct dasd_rssd_messages *messages,
5033 __u8 lpum)
5034 {
5035 struct dasd_rssd_messages *message_buf;
5036 struct dasd_psf_prssd_data *prssdp;
5037 struct dasd_ccw_req *cqr;
5038 struct ccw1 *ccw;
5039 int rc;
5040
5041 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5042 (sizeof(struct dasd_psf_prssd_data) +
5043 sizeof(struct dasd_rssd_messages)),
5044 device, NULL);
5045 if (IS_ERR(cqr)) {
5046 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5047 "Could not allocate read message buffer request");
5048 return PTR_ERR(cqr);
5049 }
5050
5051 cqr->lpm = lpum;
5052 retry:
5053 cqr->startdev = device;
5054 cqr->memdev = device;
5055 cqr->block = NULL;
5056 cqr->expires = 10 * HZ;
5057 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5058 /* dasd_sleep_on_immediatly does not do complex error
5059 * recovery so clear erp flag and set retry counter to
5060 * do basic erp */
5061 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5062 cqr->retries = 256;
5063
5064 /* Prepare for Read Subsystem Data */
5065 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5066 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5067 prssdp->order = PSF_ORDER_PRSSD;
5068 prssdp->suborder = 0x03; /* Message Buffer */
5069 /* all other bytes of prssdp must be zero */
5070
5071 ccw = cqr->cpaddr;
5072 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5073 ccw->count = sizeof(struct dasd_psf_prssd_data);
5074 ccw->flags |= CCW_FLAG_CC;
5075 ccw->flags |= CCW_FLAG_SLI;
5076 ccw->cda = (__u32)(addr_t) prssdp;
5077
5078 /* Read Subsystem Data - message buffer */
5079 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5080 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5081
5082 ccw++;
5083 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5084 ccw->count = sizeof(struct dasd_rssd_messages);
5085 ccw->flags |= CCW_FLAG_SLI;
5086 ccw->cda = (__u32)(addr_t) message_buf;
5087
5088 cqr->buildclk = get_tod_clock();
5089 cqr->status = DASD_CQR_FILLED;
5090 rc = dasd_sleep_on_immediatly(cqr);
5091 if (rc == 0) {
5092 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5093 message_buf = (struct dasd_rssd_messages *)
5094 (prssdp + 1);
5095 memcpy(messages, message_buf,
5096 sizeof(struct dasd_rssd_messages));
5097 } else if (cqr->lpm) {
5098 /*
5099 * on z/VM we might not be able to do I/O on the requested path
5100 * but instead we get the required information on any path
5101 * so retry with open path mask
5102 */
5103 cqr->lpm = 0;
5104 goto retry;
5105 } else
5106 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5107 "Reading messages failed with rc=%d\n"
5108 , rc);
5109 dasd_sfree_request(cqr, cqr->memdev);
5110 return rc;
5111 }
5112
5113 static int dasd_eckd_query_host_access(struct dasd_device *device,
5114 struct dasd_psf_query_host_access *data)
5115 {
5116 struct dasd_eckd_private *private = device->private;
5117 struct dasd_psf_query_host_access *host_access;
5118 struct dasd_psf_prssd_data *prssdp;
5119 struct dasd_ccw_req *cqr;
5120 struct ccw1 *ccw;
5121 int rc;
5122
5123 /* not available for HYPER PAV alias devices */
5124 if (!device->block && private->lcu->pav == HYPER_PAV)
5125 return -EOPNOTSUPP;
5126
5127 /* may not be supported by the storage server */
5128 if (!(private->features.feature[14] & 0x80))
5129 return -EOPNOTSUPP;
5130
5131 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5132 sizeof(struct dasd_psf_prssd_data) + 1,
5133 device, NULL);
5134 if (IS_ERR(cqr)) {
5135 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5136 "Could not allocate read message buffer request");
5137 return PTR_ERR(cqr);
5138 }
5139 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5140 if (!host_access) {
5141 dasd_sfree_request(cqr, device);
5142 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5143 "Could not allocate host_access buffer");
5144 return -ENOMEM;
5145 }
5146 cqr->startdev = device;
5147 cqr->memdev = device;
5148 cqr->block = NULL;
5149 cqr->retries = 256;
5150 cqr->expires = 10 * HZ;
5151
5152 /* Prepare for Read Subsystem Data */
5153 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5154 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5155 prssdp->order = PSF_ORDER_PRSSD;
5156 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
5157 /* LSS and Volume that will be queried */
5158 prssdp->lss = private->ned->ID;
5159 prssdp->volume = private->ned->unit_addr;
5160 /* all other bytes of prssdp must be zero */
5161
5162 ccw = cqr->cpaddr;
5163 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5164 ccw->count = sizeof(struct dasd_psf_prssd_data);
5165 ccw->flags |= CCW_FLAG_CC;
5166 ccw->flags |= CCW_FLAG_SLI;
5167 ccw->cda = (__u32)(addr_t) prssdp;
5168
5169 /* Read Subsystem Data - query host access */
5170 ccw++;
5171 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5172 ccw->count = sizeof(struct dasd_psf_query_host_access);
5173 ccw->flags |= CCW_FLAG_SLI;
5174 ccw->cda = (__u32)(addr_t) host_access;
5175
5176 cqr->buildclk = get_tod_clock();
5177 cqr->status = DASD_CQR_FILLED;
5178 /* the command might not be supported, suppress error message */
5179 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5180 rc = dasd_sleep_on_interruptible(cqr);
5181 if (rc == 0) {
5182 *data = *host_access;
5183 } else {
5184 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5185 "Reading host access data failed with rc=%d\n",
5186 rc);
5187 rc = -EOPNOTSUPP;
5188 }
5189
5190 dasd_sfree_request(cqr, cqr->memdev);
5191 kfree(host_access);
5192 return rc;
5193 }
5194 /*
5195 * return number of grouped devices
5196 */
5197 static int dasd_eckd_host_access_count(struct dasd_device *device)
5198 {
5199 struct dasd_psf_query_host_access *access;
5200 struct dasd_ckd_path_group_entry *entry;
5201 struct dasd_ckd_host_information *info;
5202 int count = 0;
5203 int rc, i;
5204
5205 access = kzalloc(sizeof(*access), GFP_NOIO);
5206 if (!access) {
5207 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5208 "Could not allocate access buffer");
5209 return -ENOMEM;
5210 }
5211 rc = dasd_eckd_query_host_access(device, access);
5212 if (rc) {
5213 kfree(access);
5214 return rc;
5215 }
5216
5217 info = (struct dasd_ckd_host_information *)
5218 access->host_access_information;
5219 for (i = 0; i < info->entry_count; i++) {
5220 entry = (struct dasd_ckd_path_group_entry *)
5221 (info->entry + i * info->entry_size);
5222 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5223 count++;
5224 }
5225
5226 kfree(access);
5227 return count;
5228 }
5229
5230 /*
5231 * write host access information to a sequential file
5232 */
5233 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5234 {
5235 struct dasd_psf_query_host_access *access;
5236 struct dasd_ckd_path_group_entry *entry;
5237 struct dasd_ckd_host_information *info;
5238 char sysplex[9] = "";
5239 int rc, i;
5240
5241 access = kzalloc(sizeof(*access), GFP_NOIO);
5242 if (!access) {
5243 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5244 "Could not allocate access buffer");
5245 return -ENOMEM;
5246 }
5247 rc = dasd_eckd_query_host_access(device, access);
5248 if (rc) {
5249 kfree(access);
5250 return rc;
5251 }
5252
5253 info = (struct dasd_ckd_host_information *)
5254 access->host_access_information;
5255 for (i = 0; i < info->entry_count; i++) {
5256 entry = (struct dasd_ckd_path_group_entry *)
5257 (info->entry + i * info->entry_size);
5258 /* PGID */
5259 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
5260 /* FLAGS */
5261 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5262 /* SYSPLEX NAME */
5263 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5264 EBCASC(sysplex, sizeof(sysplex));
5265 seq_printf(m, "sysplex_name %8s\n", sysplex);
5266 /* SUPPORTED CYLINDER */
5267 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5268 /* TIMESTAMP */
5269 seq_printf(m, "timestamp %lu\n", (unsigned long)
5270 entry->timestamp);
5271 }
5272 kfree(access);
5273
5274 return 0;
5275 }
5276
5277 /*
5278 * Perform Subsystem Function - CUIR response
5279 */
5280 static int
5281 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5282 __u32 message_id, __u8 lpum)
5283 {
5284 struct dasd_psf_cuir_response *psf_cuir;
5285 int pos = pathmask_to_pos(lpum);
5286 struct dasd_ccw_req *cqr;
5287 struct ccw1 *ccw;
5288 int rc;
5289
5290 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5291 sizeof(struct dasd_psf_cuir_response),
5292 device, NULL);
5293
5294 if (IS_ERR(cqr)) {
5295 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5296 "Could not allocate PSF-CUIR request");
5297 return PTR_ERR(cqr);
5298 }
5299
5300 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5301 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5302 psf_cuir->cc = response;
5303 psf_cuir->chpid = device->path[pos].chpid;
5304 psf_cuir->message_id = message_id;
5305 psf_cuir->cssid = device->path[pos].cssid;
5306 psf_cuir->ssid = device->path[pos].ssid;
5307 ccw = cqr->cpaddr;
5308 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5309 ccw->cda = (__u32)(addr_t)psf_cuir;
5310 ccw->flags = CCW_FLAG_SLI;
5311 ccw->count = sizeof(struct dasd_psf_cuir_response);
5312
5313 cqr->startdev = device;
5314 cqr->memdev = device;
5315 cqr->block = NULL;
5316 cqr->retries = 256;
5317 cqr->expires = 10*HZ;
5318 cqr->buildclk = get_tod_clock();
5319 cqr->status = DASD_CQR_FILLED;
5320 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5321
5322 rc = dasd_sleep_on(cqr);
5323
5324 dasd_sfree_request(cqr, cqr->memdev);
5325 return rc;
5326 }
5327
5328 /*
5329 * return configuration data that is referenced by record selector
5330 * if a record selector is specified or per default return the
5331 * conf_data pointer for the path specified by lpum
5332 */
5333 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5334 __u8 lpum,
5335 struct dasd_cuir_message *cuir)
5336 {
5337 struct dasd_conf_data *conf_data;
5338 int path, pos;
5339
5340 if (cuir->record_selector == 0)
5341 goto out;
5342 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5343 conf_data = device->path[pos].conf_data;
5344 if (conf_data->gneq.record_selector ==
5345 cuir->record_selector)
5346 return conf_data;
5347 }
5348 out:
5349 return device->path[pathmask_to_pos(lpum)].conf_data;
5350 }
5351
5352 /*
5353 * This function determines the scope of a reconfiguration request by
5354 * analysing the path and device selection data provided in the CUIR request.
5355 * Returns a path mask containing CUIR affected paths for the give device.
5356 *
5357 * If the CUIR request does not contain the required information return the
5358 * path mask of the path the attention message for the CUIR request was reveived
5359 * on.
5360 */
5361 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5362 struct dasd_cuir_message *cuir)
5363 {
5364 struct dasd_conf_data *ref_conf_data;
5365 unsigned long bitmask = 0, mask = 0;
5366 struct dasd_conf_data *conf_data;
5367 unsigned int pos, path;
5368 char *ref_gneq, *gneq;
5369 char *ref_ned, *ned;
5370 int tbcpm = 0;
5371
5372 /* if CUIR request does not specify the scope use the path
5373 the attention message was presented on */
5374 if (!cuir->ned_map ||
5375 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5376 return lpum;
5377
5378 /* get reference conf data */
5379 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5380 /* reference ned is determined by ned_map field */
5381 pos = 8 - ffs(cuir->ned_map);
5382 ref_ned = (char *)&ref_conf_data->neds[pos];
5383 ref_gneq = (char *)&ref_conf_data->gneq;
5384 /* transfer 24 bit neq_map to mask */
5385 mask = cuir->neq_map[2];
5386 mask |= cuir->neq_map[1] << 8;
5387 mask |= cuir->neq_map[0] << 16;
5388
5389 for (path = 0; path < 8; path++) {
5390 /* initialise data per path */
5391 bitmask = mask;
5392 conf_data = device->path[path].conf_data;
5393 pos = 8 - ffs(cuir->ned_map);
5394 ned = (char *) &conf_data->neds[pos];
5395 /* compare reference ned and per path ned */
5396 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5397 continue;
5398 gneq = (char *)&conf_data->gneq;
5399 /* compare reference gneq and per_path gneq under
5400 24 bit mask where mask bit 0 equals byte 7 of
5401 the gneq and mask bit 24 equals byte 31 */
5402 while (bitmask) {
5403 pos = ffs(bitmask) - 1;
5404 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5405 != 0)
5406 break;
5407 clear_bit(pos, &bitmask);
5408 }
5409 if (bitmask)
5410 continue;
5411 /* device and path match the reference values
5412 add path to CUIR scope */
5413 tbcpm |= 0x80 >> path;
5414 }
5415 return tbcpm;
5416 }
5417
5418 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5419 unsigned long paths, int action)
5420 {
5421 int pos;
5422
5423 while (paths) {
5424 /* get position of bit in mask */
5425 pos = 8 - ffs(paths);
5426 /* get channel path descriptor from this position */
5427 if (action == CUIR_QUIESCE)
5428 pr_warn("Service on the storage server caused path %x.%02x to go offline",
5429 device->path[pos].cssid,
5430 device->path[pos].chpid);
5431 else if (action == CUIR_RESUME)
5432 pr_info("Path %x.%02x is back online after service on the storage server",
5433 device->path[pos].cssid,
5434 device->path[pos].chpid);
5435 clear_bit(7 - pos, &paths);
5436 }
5437 }
5438
5439 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5440 struct dasd_cuir_message *cuir)
5441 {
5442 unsigned long tbcpm;
5443
5444 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5445 /* nothing to do if path is not in use */
5446 if (!(dasd_path_get_opm(device) & tbcpm))
5447 return 0;
5448 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5449 /* no path would be left if the CUIR action is taken
5450 return error */
5451 return -EINVAL;
5452 }
5453 /* remove device from operational path mask */
5454 dasd_path_remove_opm(device, tbcpm);
5455 dasd_path_add_cuirpm(device, tbcpm);
5456 return tbcpm;
5457 }
5458
5459 /*
5460 * walk through all devices and build a path mask to quiesce them
5461 * return an error if the last path to a device would be removed
5462 *
5463 * if only part of the devices are quiesced and an error
5464 * occurs no onlining necessary, the storage server will
5465 * notify the already set offline devices again
5466 */
5467 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5468 struct dasd_cuir_message *cuir)
5469 {
5470 struct dasd_eckd_private *private = device->private;
5471 struct alias_pav_group *pavgroup, *tempgroup;
5472 struct dasd_device *dev, *n;
5473 unsigned long paths = 0;
5474 unsigned long flags;
5475 int tbcpm;
5476
5477 /* active devices */
5478 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5479 alias_list) {
5480 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5481 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5482 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5483 if (tbcpm < 0)
5484 goto out_err;
5485 paths |= tbcpm;
5486 }
5487 /* inactive devices */
5488 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5489 alias_list) {
5490 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5491 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5492 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5493 if (tbcpm < 0)
5494 goto out_err;
5495 paths |= tbcpm;
5496 }
5497 /* devices in PAV groups */
5498 list_for_each_entry_safe(pavgroup, tempgroup,
5499 &private->lcu->grouplist, group) {
5500 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5501 alias_list) {
5502 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5503 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5504 spin_unlock_irqrestore(
5505 get_ccwdev_lock(dev->cdev), flags);
5506 if (tbcpm < 0)
5507 goto out_err;
5508 paths |= tbcpm;
5509 }
5510 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5511 alias_list) {
5512 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5513 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5514 spin_unlock_irqrestore(
5515 get_ccwdev_lock(dev->cdev), flags);
5516 if (tbcpm < 0)
5517 goto out_err;
5518 paths |= tbcpm;
5519 }
5520 }
5521 /* notify user about all paths affected by CUIR action */
5522 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5523 return 0;
5524 out_err:
5525 return tbcpm;
5526 }
5527
5528 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5529 struct dasd_cuir_message *cuir)
5530 {
5531 struct dasd_eckd_private *private = device->private;
5532 struct alias_pav_group *pavgroup, *tempgroup;
5533 struct dasd_device *dev, *n;
5534 unsigned long paths = 0;
5535 int tbcpm;
5536
5537 /*
5538 * the path may have been added through a generic path event before
5539 * only trigger path verification if the path is not already in use
5540 */
5541 list_for_each_entry_safe(dev, n,
5542 &private->lcu->active_devices,
5543 alias_list) {
5544 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5545 paths |= tbcpm;
5546 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5547 dasd_path_add_tbvpm(dev, tbcpm);
5548 dasd_schedule_device_bh(dev);
5549 }
5550 }
5551 list_for_each_entry_safe(dev, n,
5552 &private->lcu->inactive_devices,
5553 alias_list) {
5554 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5555 paths |= tbcpm;
5556 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5557 dasd_path_add_tbvpm(dev, tbcpm);
5558 dasd_schedule_device_bh(dev);
5559 }
5560 }
5561 /* devices in PAV groups */
5562 list_for_each_entry_safe(pavgroup, tempgroup,
5563 &private->lcu->grouplist,
5564 group) {
5565 list_for_each_entry_safe(dev, n,
5566 &pavgroup->baselist,
5567 alias_list) {
5568 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5569 paths |= tbcpm;
5570 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5571 dasd_path_add_tbvpm(dev, tbcpm);
5572 dasd_schedule_device_bh(dev);
5573 }
5574 }
5575 list_for_each_entry_safe(dev, n,
5576 &pavgroup->aliaslist,
5577 alias_list) {
5578 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5579 paths |= tbcpm;
5580 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5581 dasd_path_add_tbvpm(dev, tbcpm);
5582 dasd_schedule_device_bh(dev);
5583 }
5584 }
5585 }
5586 /* notify user about all paths affected by CUIR action */
5587 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5588 return 0;
5589 }
5590
5591 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5592 __u8 lpum)
5593 {
5594 struct dasd_cuir_message *cuir = messages;
5595 int response;
5596
5597 DBF_DEV_EVENT(DBF_WARNING, device,
5598 "CUIR request: %016llx %016llx %016llx %08x",
5599 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5600 ((u32 *)cuir)[3]);
5601
5602 if (cuir->code == CUIR_QUIESCE) {
5603 /* quiesce */
5604 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5605 response = PSF_CUIR_LAST_PATH;
5606 else
5607 response = PSF_CUIR_COMPLETED;
5608 } else if (cuir->code == CUIR_RESUME) {
5609 /* resume */
5610 dasd_eckd_cuir_resume(device, lpum, cuir);
5611 response = PSF_CUIR_COMPLETED;
5612 } else
5613 response = PSF_CUIR_NOT_SUPPORTED;
5614
5615 dasd_eckd_psf_cuir_response(device, response,
5616 cuir->message_id, lpum);
5617 DBF_DEV_EVENT(DBF_WARNING, device,
5618 "CUIR response: %d on message ID %08x", response,
5619 cuir->message_id);
5620 /* to make sure there is no attention left schedule work again */
5621 device->discipline->check_attention(device, lpum);
5622 }
5623
5624 static void dasd_eckd_check_attention_work(struct work_struct *work)
5625 {
5626 struct check_attention_work_data *data;
5627 struct dasd_rssd_messages *messages;
5628 struct dasd_device *device;
5629 int rc;
5630
5631 data = container_of(work, struct check_attention_work_data, worker);
5632 device = data->device;
5633 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5634 if (!messages) {
5635 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5636 "Could not allocate attention message buffer");
5637 goto out;
5638 }
5639 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5640 if (rc)
5641 goto out;
5642 if (messages->length == ATTENTION_LENGTH_CUIR &&
5643 messages->format == ATTENTION_FORMAT_CUIR)
5644 dasd_eckd_handle_cuir(device, messages, data->lpum);
5645 out:
5646 dasd_put_device(device);
5647 kfree(messages);
5648 kfree(data);
5649 }
5650
5651 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5652 {
5653 struct check_attention_work_data *data;
5654
5655 data = kzalloc(sizeof(*data), GFP_ATOMIC);
5656 if (!data)
5657 return -ENOMEM;
5658 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5659 dasd_get_device(device);
5660 data->device = device;
5661 data->lpum = lpum;
5662 schedule_work(&data->worker);
5663 return 0;
5664 }
5665
5666 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5667 {
5668 if (~lpum & dasd_path_get_opm(device)) {
5669 dasd_path_add_nohpfpm(device, lpum);
5670 dasd_path_remove_opm(device, lpum);
5671 dev_err(&device->cdev->dev,
5672 "Channel path %02X lost HPF functionality and is disabled\n",
5673 lpum);
5674 return 1;
5675 }
5676 return 0;
5677 }
5678
5679 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5680 {
5681 struct dasd_eckd_private *private = device->private;
5682
5683 dev_err(&device->cdev->dev,
5684 "High Performance FICON disabled\n");
5685 private->fcx_max_data = 0;
5686 }
5687
5688 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5689 {
5690 struct dasd_eckd_private *private = device->private;
5691
5692 return private->fcx_max_data ? 1 : 0;
5693 }
5694
5695 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5696 struct irb *irb)
5697 {
5698 struct dasd_eckd_private *private = device->private;
5699
5700 if (!private->fcx_max_data) {
5701 /* sanity check for no HPF, the error makes no sense */
5702 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5703 "Trying to disable HPF for a non HPF device");
5704 return;
5705 }
5706 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5707 dasd_eckd_disable_hpf_device(device);
5708 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5709 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5710 return;
5711 dasd_eckd_disable_hpf_device(device);
5712 dasd_path_set_tbvpm(device,
5713 dasd_path_get_hpfpm(device));
5714 }
5715 /*
5716 * prevent that any new I/O ist started on the device and schedule a
5717 * requeue of existing requests
5718 */
5719 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5720 dasd_schedule_requeue(device);
5721 }
5722
5723 static struct ccw_driver dasd_eckd_driver = {
5724 .driver = {
5725 .name = "dasd-eckd",
5726 .owner = THIS_MODULE,
5727 },
5728 .ids = dasd_eckd_ids,
5729 .probe = dasd_eckd_probe,
5730 .remove = dasd_generic_remove,
5731 .set_offline = dasd_generic_set_offline,
5732 .set_online = dasd_eckd_set_online,
5733 .notify = dasd_generic_notify,
5734 .path_event = dasd_generic_path_event,
5735 .shutdown = dasd_generic_shutdown,
5736 .freeze = dasd_generic_pm_freeze,
5737 .thaw = dasd_generic_restore_device,
5738 .restore = dasd_generic_restore_device,
5739 .uc_handler = dasd_generic_uc_handler,
5740 .int_class = IRQIO_DAS,
5741 };
5742
5743 /*
5744 * max_blocks is dependent on the amount of storage that is available
5745 * in the static io buffer for each device. Currently each device has
5746 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5747 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5748 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5749 * addition we have one define extent ccw + 16 bytes of data and one
5750 * locate record ccw + 16 bytes of data. That makes:
5751 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5752 * We want to fit two into the available memory so that we can immediately
5753 * start the next request if one finishes off. That makes 249.5 blocks
5754 * for one request. Give a little safety and the result is 240.
5755 */
5756 static struct dasd_discipline dasd_eckd_discipline = {
5757 .owner = THIS_MODULE,
5758 .name = "ECKD",
5759 .ebcname = "ECKD",
5760 .max_blocks = 190,
5761 .check_device = dasd_eckd_check_characteristics,
5762 .uncheck_device = dasd_eckd_uncheck_device,
5763 .do_analysis = dasd_eckd_do_analysis,
5764 .verify_path = dasd_eckd_verify_path,
5765 .basic_to_ready = dasd_eckd_basic_to_ready,
5766 .online_to_ready = dasd_eckd_online_to_ready,
5767 .basic_to_known = dasd_eckd_basic_to_known,
5768 .fill_geometry = dasd_eckd_fill_geometry,
5769 .start_IO = dasd_start_IO,
5770 .term_IO = dasd_term_IO,
5771 .handle_terminated_request = dasd_eckd_handle_terminated_request,
5772 .format_device = dasd_eckd_format_device,
5773 .check_device_format = dasd_eckd_check_device_format,
5774 .erp_action = dasd_eckd_erp_action,
5775 .erp_postaction = dasd_eckd_erp_postaction,
5776 .check_for_device_change = dasd_eckd_check_for_device_change,
5777 .build_cp = dasd_eckd_build_alias_cp,
5778 .free_cp = dasd_eckd_free_alias_cp,
5779 .dump_sense = dasd_eckd_dump_sense,
5780 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5781 .fill_info = dasd_eckd_fill_info,
5782 .ioctl = dasd_eckd_ioctl,
5783 .freeze = dasd_eckd_pm_freeze,
5784 .restore = dasd_eckd_restore_device,
5785 .reload = dasd_eckd_reload_device,
5786 .get_uid = dasd_eckd_get_uid,
5787 .kick_validate = dasd_eckd_kick_validate_server,
5788 .check_attention = dasd_eckd_check_attention,
5789 .host_access_count = dasd_eckd_host_access_count,
5790 .hosts_print = dasd_hosts_print,
5791 .handle_hpf_error = dasd_eckd_handle_hpf_error,
5792 .disable_hpf = dasd_eckd_disable_hpf_device,
5793 .hpf_enabled = dasd_eckd_hpf_enabled,
5794 .reset_path = dasd_eckd_reset_path,
5795 };
5796
5797 static int __init
5798 dasd_eckd_init(void)
5799 {
5800 int ret;
5801
5802 ASCEBC(dasd_eckd_discipline.ebcname, 4);
5803 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5804 GFP_KERNEL | GFP_DMA);
5805 if (!dasd_reserve_req)
5806 return -ENOMEM;
5807 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5808 GFP_KERNEL | GFP_DMA);
5809 if (!path_verification_worker) {
5810 kfree(dasd_reserve_req);
5811 return -ENOMEM;
5812 }
5813 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5814 if (!rawpadpage) {
5815 kfree(path_verification_worker);
5816 kfree(dasd_reserve_req);
5817 return -ENOMEM;
5818 }
5819 ret = ccw_driver_register(&dasd_eckd_driver);
5820 if (!ret)
5821 wait_for_device_probe();
5822 else {
5823 kfree(path_verification_worker);
5824 kfree(dasd_reserve_req);
5825 free_page((unsigned long)rawpadpage);
5826 }
5827 return ret;
5828 }
5829
5830 static void __exit
5831 dasd_eckd_cleanup(void)
5832 {
5833 ccw_driver_unregister(&dasd_eckd_driver);
5834 kfree(path_verification_worker);
5835 kfree(dasd_reserve_req);
5836 free_page((unsigned long)rawpadpage);
5837 }
5838
5839 module_init(dasd_eckd_init);
5840 module_exit(dasd_eckd_cleanup);
Linux with added FPC-III support