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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / s390 / block / dasd_eckd.c
blob6e835c9fdfcba9b5c6e9e501d6921aefa266c012
1 /*
2 * File...........: linux/drivers/s390/block/dasd_eckd.c
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/init.h>
22
23 #include <asm/debug.h>
24 #include <asm/idals.h>
25 #include <asm/ebcdic.h>
26 #include <asm/compat.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32
33 #include "dasd_int.h"
34 #include "dasd_eckd.h"
35 #include "../cio/chsc.h"
36
37
38 #ifdef PRINTK_HEADER
39 #undef PRINTK_HEADER
40 #endif /* PRINTK_HEADER */
41 #define PRINTK_HEADER "dasd(eckd):"
42
43 #define ECKD_C0(i) (i->home_bytes)
44 #define ECKD_F(i) (i->formula)
45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
46 (i->factors.f_0x02.f1))
47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
48 (i->factors.f_0x02.f2))
49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
50 (i->factors.f_0x02.f3))
51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
53 #define ECKD_F6(i) (i->factor6)
54 #define ECKD_F7(i) (i->factor7)
55 #define ECKD_F8(i) (i->factor8)
56
57 /*
58 * raw track access always map to 64k in memory
59 * so it maps to 16 blocks of 4k per track
60 */
61 #define DASD_RAW_BLOCK_PER_TRACK 16
62 #define DASD_RAW_BLOCKSIZE 4096
63 /* 64k are 128 x 512 byte sectors */
64 #define DASD_RAW_SECTORS_PER_TRACK 128
65
66 MODULE_LICENSE("GPL");
67
68 static struct dasd_discipline dasd_eckd_discipline;
69
70 /* The ccw bus type uses this table to find devices that it sends to
71 * dasd_eckd_probe */
72 static struct ccw_device_id dasd_eckd_ids[] = {
73 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
74 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
75 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
76 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
77 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
78 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
79 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
80 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
81 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
82 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
83 { /* end of list */ },
84 };
85
86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
87
88 static struct ccw_driver dasd_eckd_driver; /* see below */
89
90 #define INIT_CQR_OK 0
91 #define INIT_CQR_UNFORMATTED 1
92 #define INIT_CQR_ERROR 2
93
94 /* emergency request for reserve/release */
95 static struct {
96 struct dasd_ccw_req cqr;
97 struct ccw1 ccw;
98 char data[32];
99 } *dasd_reserve_req;
100 static DEFINE_MUTEX(dasd_reserve_mutex);
101
102 /* definitions for the path verification worker */
103 struct path_verification_work_data {
104 struct work_struct worker;
105 struct dasd_device *device;
106 struct dasd_ccw_req cqr;
107 struct ccw1 ccw;
108 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
109 int isglobal;
110 __u8 tbvpm;
111 };
112 static struct path_verification_work_data *path_verification_worker;
113 static DEFINE_MUTEX(dasd_path_verification_mutex);
114
115 /* initial attempt at a probe function. this can be simplified once
116 * the other detection code is gone */
117 static int
118 dasd_eckd_probe (struct ccw_device *cdev)
119 {
120 int ret;
121
122 /* set ECKD specific ccw-device options */
123 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
124 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
125 if (ret) {
126 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
127 "dasd_eckd_probe: could not set "
128 "ccw-device options");
129 return ret;
130 }
131 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
132 return ret;
133 }
134
135 static int
136 dasd_eckd_set_online(struct ccw_device *cdev)
137 {
138 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
139 }
140
141 static const int sizes_trk0[] = { 28, 148, 84 };
142 #define LABEL_SIZE 140
143
144 static inline unsigned int
145 round_up_multiple(unsigned int no, unsigned int mult)
146 {
147 int rem = no % mult;
148 return (rem ? no - rem + mult : no);
149 }
150
151 static inline unsigned int
152 ceil_quot(unsigned int d1, unsigned int d2)
153 {
154 return (d1 + (d2 - 1)) / d2;
155 }
156
157 static unsigned int
158 recs_per_track(struct dasd_eckd_characteristics * rdc,
159 unsigned int kl, unsigned int dl)
160 {
161 int dn, kn;
162
163 switch (rdc->dev_type) {
164 case 0x3380:
165 if (kl)
166 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
167 ceil_quot(dl + 12, 32));
168 else
169 return 1499 / (15 + ceil_quot(dl + 12, 32));
170 case 0x3390:
171 dn = ceil_quot(dl + 6, 232) + 1;
172 if (kl) {
173 kn = ceil_quot(kl + 6, 232) + 1;
174 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
175 9 + ceil_quot(dl + 6 * dn, 34));
176 } else
177 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
178 case 0x9345:
179 dn = ceil_quot(dl + 6, 232) + 1;
180 if (kl) {
181 kn = ceil_quot(kl + 6, 232) + 1;
182 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
183 ceil_quot(dl + 6 * dn, 34));
184 } else
185 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
186 }
187 return 0;
188 }
189
190 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
191 {
192 geo->cyl = (__u16) cyl;
193 geo->head = cyl >> 16;
194 geo->head <<= 4;
195 geo->head |= head;
196 }
197
198 static int
199 check_XRC (struct ccw1 *de_ccw,
200 struct DE_eckd_data *data,
201 struct dasd_device *device)
202 {
203 struct dasd_eckd_private *private;
204 int rc;
205
206 private = (struct dasd_eckd_private *) device->private;
207 if (!private->rdc_data.facilities.XRC_supported)
208 return 0;
209
210 /* switch on System Time Stamp - needed for XRC Support */
211 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
212 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
213
214 rc = get_sync_clock(&data->ep_sys_time);
215 /* Ignore return code if sync clock is switched off. */
216 if (rc == -ENOSYS || rc == -EACCES)
217 rc = 0;
218
219 de_ccw->count = sizeof(struct DE_eckd_data);
220 de_ccw->flags |= CCW_FLAG_SLI;
221 return rc;
222 }
223
224 static int
225 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
226 unsigned int totrk, int cmd, struct dasd_device *device)
227 {
228 struct dasd_eckd_private *private;
229 u32 begcyl, endcyl;
230 u16 heads, beghead, endhead;
231 int rc = 0;
232
233 private = (struct dasd_eckd_private *) device->private;
234
235 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
236 ccw->flags = 0;
237 ccw->count = 16;
238 ccw->cda = (__u32) __pa(data);
239
240 memset(data, 0, sizeof(struct DE_eckd_data));
241 switch (cmd) {
242 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
243 case DASD_ECKD_CCW_READ_RECORD_ZERO:
244 case DASD_ECKD_CCW_READ:
245 case DASD_ECKD_CCW_READ_MT:
246 case DASD_ECKD_CCW_READ_CKD:
247 case DASD_ECKD_CCW_READ_CKD_MT:
248 case DASD_ECKD_CCW_READ_KD:
249 case DASD_ECKD_CCW_READ_KD_MT:
250 case DASD_ECKD_CCW_READ_COUNT:
251 data->mask.perm = 0x1;
252 data->attributes.operation = private->attrib.operation;
253 break;
254 case DASD_ECKD_CCW_WRITE:
255 case DASD_ECKD_CCW_WRITE_MT:
256 case DASD_ECKD_CCW_WRITE_KD:
257 case DASD_ECKD_CCW_WRITE_KD_MT:
258 data->mask.perm = 0x02;
259 data->attributes.operation = private->attrib.operation;
260 rc = check_XRC (ccw, data, device);
261 break;
262 case DASD_ECKD_CCW_WRITE_CKD:
263 case DASD_ECKD_CCW_WRITE_CKD_MT:
264 data->attributes.operation = DASD_BYPASS_CACHE;
265 rc = check_XRC (ccw, data, device);
266 break;
267 case DASD_ECKD_CCW_ERASE:
268 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
269 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
270 data->mask.perm = 0x3;
271 data->mask.auth = 0x1;
272 data->attributes.operation = DASD_BYPASS_CACHE;
273 rc = check_XRC (ccw, data, device);
274 break;
275 default:
276 dev_err(&device->cdev->dev,
277 "0x%x is not a known command\n", cmd);
278 break;
279 }
280
281 data->attributes.mode = 0x3; /* ECKD */
282
283 if ((private->rdc_data.cu_type == 0x2105 ||
284 private->rdc_data.cu_type == 0x2107 ||
285 private->rdc_data.cu_type == 0x1750)
286 && !(private->uses_cdl && trk < 2))
287 data->ga_extended |= 0x40; /* Regular Data Format Mode */
288
289 heads = private->rdc_data.trk_per_cyl;
290 begcyl = trk / heads;
291 beghead = trk % heads;
292 endcyl = totrk / heads;
293 endhead = totrk % heads;
294
295 /* check for sequential prestage - enhance cylinder range */
296 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
297 data->attributes.operation == DASD_SEQ_ACCESS) {
298
299 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
300 endcyl += private->attrib.nr_cyl;
301 else
302 endcyl = (private->real_cyl - 1);
303 }
304
305 set_ch_t(&data->beg_ext, begcyl, beghead);
306 set_ch_t(&data->end_ext, endcyl, endhead);
307 return rc;
308 }
309
310 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
311 struct dasd_device *device)
312 {
313 struct dasd_eckd_private *private;
314 int rc;
315
316 private = (struct dasd_eckd_private *) device->private;
317 if (!private->rdc_data.facilities.XRC_supported)
318 return 0;
319
320 /* switch on System Time Stamp - needed for XRC Support */
321 pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
322 pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
323 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
324
325 rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
326 /* Ignore return code if sync clock is switched off. */
327 if (rc == -ENOSYS || rc == -EACCES)
328 rc = 0;
329 return rc;
330 }
331
332 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
333 unsigned int rec_on_trk, int count, int cmd,
334 struct dasd_device *device, unsigned int reclen,
335 unsigned int tlf)
336 {
337 struct dasd_eckd_private *private;
338 int sector;
339 int dn, d;
340
341 private = (struct dasd_eckd_private *) device->private;
342
343 memset(data, 0, sizeof(*data));
344 sector = 0;
345 if (rec_on_trk) {
346 switch (private->rdc_data.dev_type) {
347 case 0x3390:
348 dn = ceil_quot(reclen + 6, 232);
349 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
350 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
351 break;
352 case 0x3380:
353 d = 7 + ceil_quot(reclen + 12, 32);
354 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
355 break;
356 }
357 }
358 data->sector = sector;
359 /* note: meaning of count depends on the operation
360 * for record based I/O it's the number of records, but for
361 * track based I/O it's the number of tracks
362 */
363 data->count = count;
364 switch (cmd) {
365 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
366 data->operation.orientation = 0x3;
367 data->operation.operation = 0x03;
368 break;
369 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
370 data->operation.orientation = 0x3;
371 data->operation.operation = 0x16;
372 break;
373 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
374 data->operation.orientation = 0x1;
375 data->operation.operation = 0x03;
376 data->count++;
377 break;
378 case DASD_ECKD_CCW_READ_RECORD_ZERO:
379 data->operation.orientation = 0x3;
380 data->operation.operation = 0x16;
381 data->count++;
382 break;
383 case DASD_ECKD_CCW_WRITE:
384 case DASD_ECKD_CCW_WRITE_MT:
385 case DASD_ECKD_CCW_WRITE_KD:
386 case DASD_ECKD_CCW_WRITE_KD_MT:
387 data->auxiliary.length_valid = 0x1;
388 data->length = reclen;
389 data->operation.operation = 0x01;
390 break;
391 case DASD_ECKD_CCW_WRITE_CKD:
392 case DASD_ECKD_CCW_WRITE_CKD_MT:
393 data->auxiliary.length_valid = 0x1;
394 data->length = reclen;
395 data->operation.operation = 0x03;
396 break;
397 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
398 data->operation.orientation = 0x0;
399 data->operation.operation = 0x3F;
400 data->extended_operation = 0x11;
401 data->length = 0;
402 data->extended_parameter_length = 0x02;
403 if (data->count > 8) {
404 data->extended_parameter[0] = 0xFF;
405 data->extended_parameter[1] = 0xFF;
406 data->extended_parameter[1] <<= (16 - count);
407 } else {
408 data->extended_parameter[0] = 0xFF;
409 data->extended_parameter[0] <<= (8 - count);
410 data->extended_parameter[1] = 0x00;
411 }
412 data->sector = 0xFF;
413 break;
414 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
415 data->auxiliary.length_valid = 0x1;
416 data->length = reclen; /* not tlf, as one might think */
417 data->operation.operation = 0x3F;
418 data->extended_operation = 0x23;
419 break;
420 case DASD_ECKD_CCW_READ:
421 case DASD_ECKD_CCW_READ_MT:
422 case DASD_ECKD_CCW_READ_KD:
423 case DASD_ECKD_CCW_READ_KD_MT:
424 data->auxiliary.length_valid = 0x1;
425 data->length = reclen;
426 data->operation.operation = 0x06;
427 break;
428 case DASD_ECKD_CCW_READ_CKD:
429 case DASD_ECKD_CCW_READ_CKD_MT:
430 data->auxiliary.length_valid = 0x1;
431 data->length = reclen;
432 data->operation.operation = 0x16;
433 break;
434 case DASD_ECKD_CCW_READ_COUNT:
435 data->operation.operation = 0x06;
436 break;
437 case DASD_ECKD_CCW_READ_TRACK:
438 data->operation.orientation = 0x1;
439 data->operation.operation = 0x0C;
440 data->extended_parameter_length = 0;
441 data->sector = 0xFF;
442 break;
443 case DASD_ECKD_CCW_READ_TRACK_DATA:
444 data->auxiliary.length_valid = 0x1;
445 data->length = tlf;
446 data->operation.operation = 0x0C;
447 break;
448 case DASD_ECKD_CCW_ERASE:
449 data->length = reclen;
450 data->auxiliary.length_valid = 0x1;
451 data->operation.operation = 0x0b;
452 break;
453 default:
454 DBF_DEV_EVENT(DBF_ERR, device,
455 "fill LRE unknown opcode 0x%x", cmd);
456 BUG();
457 }
458 set_ch_t(&data->seek_addr,
459 trk / private->rdc_data.trk_per_cyl,
460 trk % private->rdc_data.trk_per_cyl);
461 data->search_arg.cyl = data->seek_addr.cyl;
462 data->search_arg.head = data->seek_addr.head;
463 data->search_arg.record = rec_on_trk;
464 }
465
466 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
467 unsigned int trk, unsigned int totrk, int cmd,
468 struct dasd_device *basedev, struct dasd_device *startdev,
469 unsigned char format, unsigned int rec_on_trk, int count,
470 unsigned int blksize, unsigned int tlf)
471 {
472 struct dasd_eckd_private *basepriv, *startpriv;
473 struct DE_eckd_data *dedata;
474 struct LRE_eckd_data *lredata;
475 u32 begcyl, endcyl;
476 u16 heads, beghead, endhead;
477 int rc = 0;
478
479 basepriv = (struct dasd_eckd_private *) basedev->private;
480 startpriv = (struct dasd_eckd_private *) startdev->private;
481 dedata = &pfxdata->define_extent;
482 lredata = &pfxdata->locate_record;
483
484 ccw->cmd_code = DASD_ECKD_CCW_PFX;
485 ccw->flags = 0;
486 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
487 ccw->count = sizeof(*pfxdata) + 2;
488 ccw->cda = (__u32) __pa(pfxdata);
489 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
490 } else {
491 ccw->count = sizeof(*pfxdata);
492 ccw->cda = (__u32) __pa(pfxdata);
493 memset(pfxdata, 0, sizeof(*pfxdata));
494 }
495
496 /* prefix data */
497 if (format > 1) {
498 DBF_DEV_EVENT(DBF_ERR, basedev,
499 "PFX LRE unknown format 0x%x", format);
500 BUG();
501 return -EINVAL;
502 }
503 pfxdata->format = format;
504 pfxdata->base_address = basepriv->ned->unit_addr;
505 pfxdata->base_lss = basepriv->ned->ID;
506 pfxdata->validity.define_extent = 1;
507
508 /* private uid is kept up to date, conf_data may be outdated */
509 if (startpriv->uid.type != UA_BASE_DEVICE) {
510 pfxdata->validity.verify_base = 1;
511 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
512 pfxdata->validity.hyper_pav = 1;
513 }
514
515 /* define extend data (mostly)*/
516 switch (cmd) {
517 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
518 case DASD_ECKD_CCW_READ_RECORD_ZERO:
519 case DASD_ECKD_CCW_READ:
520 case DASD_ECKD_CCW_READ_MT:
521 case DASD_ECKD_CCW_READ_CKD:
522 case DASD_ECKD_CCW_READ_CKD_MT:
523 case DASD_ECKD_CCW_READ_KD:
524 case DASD_ECKD_CCW_READ_KD_MT:
525 case DASD_ECKD_CCW_READ_COUNT:
526 dedata->mask.perm = 0x1;
527 dedata->attributes.operation = basepriv->attrib.operation;
528 break;
529 case DASD_ECKD_CCW_READ_TRACK:
530 case DASD_ECKD_CCW_READ_TRACK_DATA:
531 dedata->mask.perm = 0x1;
532 dedata->attributes.operation = basepriv->attrib.operation;
533 dedata->blk_size = 0;
534 break;
535 case DASD_ECKD_CCW_WRITE:
536 case DASD_ECKD_CCW_WRITE_MT:
537 case DASD_ECKD_CCW_WRITE_KD:
538 case DASD_ECKD_CCW_WRITE_KD_MT:
539 dedata->mask.perm = 0x02;
540 dedata->attributes.operation = basepriv->attrib.operation;
541 rc = check_XRC_on_prefix(pfxdata, basedev);
542 break;
543 case DASD_ECKD_CCW_WRITE_CKD:
544 case DASD_ECKD_CCW_WRITE_CKD_MT:
545 dedata->attributes.operation = DASD_BYPASS_CACHE;
546 rc = check_XRC_on_prefix(pfxdata, basedev);
547 break;
548 case DASD_ECKD_CCW_ERASE:
549 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
550 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
551 dedata->mask.perm = 0x3;
552 dedata->mask.auth = 0x1;
553 dedata->attributes.operation = DASD_BYPASS_CACHE;
554 rc = check_XRC_on_prefix(pfxdata, basedev);
555 break;
556 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
557 dedata->mask.perm = 0x03;
558 dedata->attributes.operation = basepriv->attrib.operation;
559 dedata->blk_size = 0;
560 break;
561 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
562 dedata->mask.perm = 0x02;
563 dedata->attributes.operation = basepriv->attrib.operation;
564 dedata->blk_size = blksize;
565 rc = check_XRC_on_prefix(pfxdata, basedev);
566 break;
567 default:
568 DBF_DEV_EVENT(DBF_ERR, basedev,
569 "PFX LRE unknown opcode 0x%x", cmd);
570 BUG();
571 return -EINVAL;
572 }
573
574 dedata->attributes.mode = 0x3; /* ECKD */
575
576 if ((basepriv->rdc_data.cu_type == 0x2105 ||
577 basepriv->rdc_data.cu_type == 0x2107 ||
578 basepriv->rdc_data.cu_type == 0x1750)
579 && !(basepriv->uses_cdl && trk < 2))
580 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
581
582 heads = basepriv->rdc_data.trk_per_cyl;
583 begcyl = trk / heads;
584 beghead = trk % heads;
585 endcyl = totrk / heads;
586 endhead = totrk % heads;
587
588 /* check for sequential prestage - enhance cylinder range */
589 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
590 dedata->attributes.operation == DASD_SEQ_ACCESS) {
591
592 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
593 endcyl += basepriv->attrib.nr_cyl;
594 else
595 endcyl = (basepriv->real_cyl - 1);
596 }
597
598 set_ch_t(&dedata->beg_ext, begcyl, beghead);
599 set_ch_t(&dedata->end_ext, endcyl, endhead);
600
601 if (format == 1) {
602 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
603 basedev, blksize, tlf);
604 }
605
606 return rc;
607 }
608
609 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
610 unsigned int trk, unsigned int totrk, int cmd,
611 struct dasd_device *basedev, struct dasd_device *startdev)
612 {
613 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
614 0, 0, 0, 0, 0);
615 }
616
617 static void
618 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
619 unsigned int rec_on_trk, int no_rec, int cmd,
620 struct dasd_device * device, int reclen)
621 {
622 struct dasd_eckd_private *private;
623 int sector;
624 int dn, d;
625
626 private = (struct dasd_eckd_private *) device->private;
627
628 DBF_DEV_EVENT(DBF_INFO, device,
629 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
630 trk, rec_on_trk, no_rec, cmd, reclen);
631
632 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
633 ccw->flags = 0;
634 ccw->count = 16;
635 ccw->cda = (__u32) __pa(data);
636
637 memset(data, 0, sizeof(struct LO_eckd_data));
638 sector = 0;
639 if (rec_on_trk) {
640 switch (private->rdc_data.dev_type) {
641 case 0x3390:
642 dn = ceil_quot(reclen + 6, 232);
643 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
644 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
645 break;
646 case 0x3380:
647 d = 7 + ceil_quot(reclen + 12, 32);
648 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
649 break;
650 }
651 }
652 data->sector = sector;
653 data->count = no_rec;
654 switch (cmd) {
655 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
656 data->operation.orientation = 0x3;
657 data->operation.operation = 0x03;
658 break;
659 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
660 data->operation.orientation = 0x3;
661 data->operation.operation = 0x16;
662 break;
663 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
664 data->operation.orientation = 0x1;
665 data->operation.operation = 0x03;
666 data->count++;
667 break;
668 case DASD_ECKD_CCW_READ_RECORD_ZERO:
669 data->operation.orientation = 0x3;
670 data->operation.operation = 0x16;
671 data->count++;
672 break;
673 case DASD_ECKD_CCW_WRITE:
674 case DASD_ECKD_CCW_WRITE_MT:
675 case DASD_ECKD_CCW_WRITE_KD:
676 case DASD_ECKD_CCW_WRITE_KD_MT:
677 data->auxiliary.last_bytes_used = 0x1;
678 data->length = reclen;
679 data->operation.operation = 0x01;
680 break;
681 case DASD_ECKD_CCW_WRITE_CKD:
682 case DASD_ECKD_CCW_WRITE_CKD_MT:
683 data->auxiliary.last_bytes_used = 0x1;
684 data->length = reclen;
685 data->operation.operation = 0x03;
686 break;
687 case DASD_ECKD_CCW_READ:
688 case DASD_ECKD_CCW_READ_MT:
689 case DASD_ECKD_CCW_READ_KD:
690 case DASD_ECKD_CCW_READ_KD_MT:
691 data->auxiliary.last_bytes_used = 0x1;
692 data->length = reclen;
693 data->operation.operation = 0x06;
694 break;
695 case DASD_ECKD_CCW_READ_CKD:
696 case DASD_ECKD_CCW_READ_CKD_MT:
697 data->auxiliary.last_bytes_used = 0x1;
698 data->length = reclen;
699 data->operation.operation = 0x16;
700 break;
701 case DASD_ECKD_CCW_READ_COUNT:
702 data->operation.operation = 0x06;
703 break;
704 case DASD_ECKD_CCW_ERASE:
705 data->length = reclen;
706 data->auxiliary.last_bytes_used = 0x1;
707 data->operation.operation = 0x0b;
708 break;
709 default:
710 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
711 "opcode 0x%x", cmd);
712 }
713 set_ch_t(&data->seek_addr,
714 trk / private->rdc_data.trk_per_cyl,
715 trk % private->rdc_data.trk_per_cyl);
716 data->search_arg.cyl = data->seek_addr.cyl;
717 data->search_arg.head = data->seek_addr.head;
718 data->search_arg.record = rec_on_trk;
719 }
720
721 /*
722 * Returns 1 if the block is one of the special blocks that needs
723 * to get read/written with the KD variant of the command.
724 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
725 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
726 * Luckily the KD variants differ only by one bit (0x08) from the
727 * normal variant. So don't wonder about code like:
728 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
729 * ccw->cmd_code |= 0x8;
730 */
731 static inline int
732 dasd_eckd_cdl_special(int blk_per_trk, int recid)
733 {
734 if (recid < 3)
735 return 1;
736 if (recid < blk_per_trk)
737 return 0;
738 if (recid < 2 * blk_per_trk)
739 return 1;
740 return 0;
741 }
742
743 /*
744 * Returns the record size for the special blocks of the cdl format.
745 * Only returns something useful if dasd_eckd_cdl_special is true
746 * for the recid.
747 */
748 static inline int
749 dasd_eckd_cdl_reclen(int recid)
750 {
751 if (recid < 3)
752 return sizes_trk0[recid];
753 return LABEL_SIZE;
754 }
755
756 /*
757 * Generate device unique id that specifies the physical device.
758 */
759 static int dasd_eckd_generate_uid(struct dasd_device *device)
760 {
761 struct dasd_eckd_private *private;
762 struct dasd_uid *uid;
763 int count;
764 unsigned long flags;
765
766 private = (struct dasd_eckd_private *) device->private;
767 if (!private)
768 return -ENODEV;
769 if (!private->ned || !private->gneq)
770 return -ENODEV;
771 uid = &private->uid;
772 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
773 memset(uid, 0, sizeof(struct dasd_uid));
774 memcpy(uid->vendor, private->ned->HDA_manufacturer,
775 sizeof(uid->vendor) - 1);
776 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
777 memcpy(uid->serial, private->ned->HDA_location,
778 sizeof(uid->serial) - 1);
779 EBCASC(uid->serial, sizeof(uid->serial) - 1);
780 uid->ssid = private->gneq->subsystemID;
781 uid->real_unit_addr = private->ned->unit_addr;
782 if (private->sneq) {
783 uid->type = private->sneq->sua_flags;
784 if (uid->type == UA_BASE_PAV_ALIAS)
785 uid->base_unit_addr = private->sneq->base_unit_addr;
786 } else {
787 uid->type = UA_BASE_DEVICE;
788 }
789 if (private->vdsneq) {
790 for (count = 0; count < 16; count++) {
791 sprintf(uid->vduit+2*count, "%02x",
792 private->vdsneq->uit[count]);
793 }
794 }
795 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
796 return 0;
797 }
798
799 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
800 {
801 struct dasd_eckd_private *private;
802 unsigned long flags;
803
804 if (device->private) {
805 private = (struct dasd_eckd_private *)device->private;
806 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
807 *uid = private->uid;
808 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
809 return 0;
810 }
811 return -EINVAL;
812 }
813
814 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
815 struct dasd_ccw_req *cqr,
816 __u8 *rcd_buffer,
817 __u8 lpm)
818 {
819 struct ccw1 *ccw;
820 /*
821 * buffer has to start with EBCDIC "V1.0" to show
822 * support for virtual device SNEQ
823 */
824 rcd_buffer[0] = 0xE5;
825 rcd_buffer[1] = 0xF1;
826 rcd_buffer[2] = 0x4B;
827 rcd_buffer[3] = 0xF0;
828
829 ccw = cqr->cpaddr;
830 ccw->cmd_code = DASD_ECKD_CCW_RCD;
831 ccw->flags = 0;
832 ccw->cda = (__u32)(addr_t)rcd_buffer;
833 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
834 cqr->magic = DASD_ECKD_MAGIC;
835
836 cqr->startdev = device;
837 cqr->memdev = device;
838 cqr->block = NULL;
839 cqr->expires = 10*HZ;
840 cqr->lpm = lpm;
841 cqr->retries = 256;
842 cqr->buildclk = get_clock();
843 cqr->status = DASD_CQR_FILLED;
844 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
845 }
846
847 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
848 struct dasd_ccw_req *cqr,
849 __u8 *rcd_buffer,
850 __u8 lpm)
851 {
852 struct ciw *ciw;
853 int rc;
854 /*
855 * sanity check: scan for RCD command in extended SenseID data
856 * some devices do not support RCD
857 */
858 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
859 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
860 return -EOPNOTSUPP;
861
862 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
863 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
864 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
865 cqr->retries = 5;
866 rc = dasd_sleep_on_immediatly(cqr);
867 return rc;
868 }
869
870 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
871 void **rcd_buffer,
872 int *rcd_buffer_size, __u8 lpm)
873 {
874 struct ciw *ciw;
875 char *rcd_buf = NULL;
876 int ret;
877 struct dasd_ccw_req *cqr;
878
879 /*
880 * sanity check: scan for RCD command in extended SenseID data
881 * some devices do not support RCD
882 */
883 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
884 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
885 ret = -EOPNOTSUPP;
886 goto out_error;
887 }
888 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
889 if (!rcd_buf) {
890 ret = -ENOMEM;
891 goto out_error;
892 }
893 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
894 0, /* use rcd_buf as data ara */
895 device);
896 if (IS_ERR(cqr)) {
897 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
898 "Could not allocate RCD request");
899 ret = -ENOMEM;
900 goto out_error;
901 }
902 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
903 ret = dasd_sleep_on(cqr);
904 /*
905 * on success we update the user input parms
906 */
907 dasd_sfree_request(cqr, cqr->memdev);
908 if (ret)
909 goto out_error;
910
911 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
912 *rcd_buffer = rcd_buf;
913 return 0;
914 out_error:
915 kfree(rcd_buf);
916 *rcd_buffer = NULL;
917 *rcd_buffer_size = 0;
918 return ret;
919 }
920
921 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
922 {
923
924 struct dasd_sneq *sneq;
925 int i, count;
926
927 private->ned = NULL;
928 private->sneq = NULL;
929 private->vdsneq = NULL;
930 private->gneq = NULL;
931 count = private->conf_len / sizeof(struct dasd_sneq);
932 sneq = (struct dasd_sneq *)private->conf_data;
933 for (i = 0; i < count; ++i) {
934 if (sneq->flags.identifier == 1 && sneq->format == 1)
935 private->sneq = sneq;
936 else if (sneq->flags.identifier == 1 && sneq->format == 4)
937 private->vdsneq = (struct vd_sneq *)sneq;
938 else if (sneq->flags.identifier == 2)
939 private->gneq = (struct dasd_gneq *)sneq;
940 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
941 private->ned = (struct dasd_ned *)sneq;
942 sneq++;
943 }
944 if (!private->ned || !private->gneq) {
945 private->ned = NULL;
946 private->sneq = NULL;
947 private->vdsneq = NULL;
948 private->gneq = NULL;
949 return -EINVAL;
950 }
951 return 0;
952
953 };
954
955 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
956 {
957 struct dasd_gneq *gneq;
958 int i, count, found;
959
960 count = conf_len / sizeof(*gneq);
961 gneq = (struct dasd_gneq *)conf_data;
962 found = 0;
963 for (i = 0; i < count; ++i) {
964 if (gneq->flags.identifier == 2) {
965 found = 1;
966 break;
967 }
968 gneq++;
969 }
970 if (found)
971 return ((char *)gneq)[18] & 0x07;
972 else
973 return 0;
974 }
975
976 static int dasd_eckd_read_conf(struct dasd_device *device)
977 {
978 void *conf_data;
979 int conf_len, conf_data_saved;
980 int rc;
981 __u8 lpm, opm;
982 struct dasd_eckd_private *private;
983 struct dasd_path *path_data;
984
985 private = (struct dasd_eckd_private *) device->private;
986 path_data = &device->path_data;
987 opm = ccw_device_get_path_mask(device->cdev);
988 lpm = 0x80;
989 conf_data_saved = 0;
990 /* get configuration data per operational path */
991 for (lpm = 0x80; lpm; lpm>>= 1) {
992 if (lpm & opm) {
993 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
994 &conf_len, lpm);
995 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
996 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
997 "Read configuration data returned "
998 "error %d", rc);
999 return rc;
1000 }
1001 if (conf_data == NULL) {
1002 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1003 "No configuration data "
1004 "retrieved");
1005 /* no further analysis possible */
1006 path_data->opm |= lpm;
1007 continue; /* no error */
1008 }
1009 /* save first valid configuration data */
1010 if (!conf_data_saved) {
1011 kfree(private->conf_data);
1012 private->conf_data = conf_data;
1013 private->conf_len = conf_len;
1014 if (dasd_eckd_identify_conf_parts(private)) {
1015 private->conf_data = NULL;
1016 private->conf_len = 0;
1017 kfree(conf_data);
1018 continue;
1019 }
1020 conf_data_saved++;
1021 }
1022 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1023 case 0x02:
1024 path_data->npm |= lpm;
1025 break;
1026 case 0x03:
1027 path_data->ppm |= lpm;
1028 break;
1029 }
1030 path_data->opm |= lpm;
1031 if (conf_data != private->conf_data)
1032 kfree(conf_data);
1033 }
1034 }
1035 return 0;
1036 }
1037
1038 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1039 {
1040 struct dasd_eckd_private *private;
1041 int mdc;
1042 u32 fcx_max_data;
1043
1044 private = (struct dasd_eckd_private *) device->private;
1045 if (private->fcx_max_data) {
1046 mdc = ccw_device_get_mdc(device->cdev, lpm);
1047 if ((mdc < 0)) {
1048 dev_warn(&device->cdev->dev,
1049 "Detecting the maximum data size for zHPF "
1050 "requests failed (rc=%d) for a new path %x\n",
1051 mdc, lpm);
1052 return mdc;
1053 }
1054 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1055 if (fcx_max_data < private->fcx_max_data) {
1056 dev_warn(&device->cdev->dev,
1057 "The maximum data size for zHPF requests %u "
1058 "on a new path %x is below the active maximum "
1059 "%u\n", fcx_max_data, lpm,
1060 private->fcx_max_data);
1061 return -EACCES;
1062 }
1063 }
1064 return 0;
1065 }
1066
1067 static void do_path_verification_work(struct work_struct *work)
1068 {
1069 struct path_verification_work_data *data;
1070 struct dasd_device *device;
1071 __u8 lpm, opm, npm, ppm, epm;
1072 unsigned long flags;
1073 int rc;
1074
1075 data = container_of(work, struct path_verification_work_data, worker);
1076 device = data->device;
1077
1078 opm = 0;
1079 npm = 0;
1080 ppm = 0;
1081 epm = 0;
1082 for (lpm = 0x80; lpm; lpm >>= 1) {
1083 if (lpm & data->tbvpm) {
1084 memset(data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1085 memset(&data->cqr, 0, sizeof(data->cqr));
1086 data->cqr.cpaddr = &data->ccw;
1087 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1088 data->rcd_buffer,
1089 lpm);
1090 if (!rc) {
1091 switch (dasd_eckd_path_access(data->rcd_buffer,
1092 DASD_ECKD_RCD_DATA_SIZE)) {
1093 case 0x02:
1094 npm |= lpm;
1095 break;
1096 case 0x03:
1097 ppm |= lpm;
1098 break;
1099 }
1100 opm |= lpm;
1101 } else if (rc == -EOPNOTSUPP) {
1102 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1103 "path verification: No configuration "
1104 "data retrieved");
1105 opm |= lpm;
1106 } else if (rc == -EAGAIN) {
1107 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1108 "path verification: device is stopped,"
1109 " try again later");
1110 epm |= lpm;
1111 } else {
1112 dev_warn(&device->cdev->dev,
1113 "Reading device feature codes failed "
1114 "(rc=%d) for new path %x\n", rc, lpm);
1115 continue;
1116 }
1117 if (verify_fcx_max_data(device, lpm)) {
1118 opm &= ~lpm;
1119 npm &= ~lpm;
1120 ppm &= ~lpm;
1121 }
1122 }
1123 }
1124 /*
1125 * There is a small chance that a path is lost again between
1126 * above path verification and the following modification of
1127 * the device opm mask. We could avoid that race here by using
1128 * yet another path mask, but we rather deal with this unlikely
1129 * situation in dasd_start_IO.
1130 */
1131 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1132 if (!device->path_data.opm && opm) {
1133 device->path_data.opm = opm;
1134 dasd_generic_path_operational(device);
1135 } else
1136 device->path_data.opm |= opm;
1137 device->path_data.npm |= npm;
1138 device->path_data.ppm |= ppm;
1139 device->path_data.tbvpm |= epm;
1140 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1141
1142 dasd_put_device(device);
1143 if (data->isglobal)
1144 mutex_unlock(&dasd_path_verification_mutex);
1145 else
1146 kfree(data);
1147 }
1148
1149 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1150 {
1151 struct path_verification_work_data *data;
1152
1153 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1154 if (!data) {
1155 if (mutex_trylock(&dasd_path_verification_mutex)) {
1156 data = path_verification_worker;
1157 data->isglobal = 1;
1158 } else
1159 return -ENOMEM;
1160 } else {
1161 memset(data, 0, sizeof(*data));
1162 data->isglobal = 0;
1163 }
1164 INIT_WORK(&data->worker, do_path_verification_work);
1165 dasd_get_device(device);
1166 data->device = device;
1167 data->tbvpm = lpm;
1168 schedule_work(&data->worker);
1169 return 0;
1170 }
1171
1172 static int dasd_eckd_read_features(struct dasd_device *device)
1173 {
1174 struct dasd_psf_prssd_data *prssdp;
1175 struct dasd_rssd_features *features;
1176 struct dasd_ccw_req *cqr;
1177 struct ccw1 *ccw;
1178 int rc;
1179 struct dasd_eckd_private *private;
1180
1181 private = (struct dasd_eckd_private *) device->private;
1182 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1183 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1184 (sizeof(struct dasd_psf_prssd_data) +
1185 sizeof(struct dasd_rssd_features)),
1186 device);
1187 if (IS_ERR(cqr)) {
1188 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1189 "allocate initialization request");
1190 return PTR_ERR(cqr);
1191 }
1192 cqr->startdev = device;
1193 cqr->memdev = device;
1194 cqr->block = NULL;
1195 cqr->retries = 256;
1196 cqr->expires = 10 * HZ;
1197
1198 /* Prepare for Read Subsystem Data */
1199 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1200 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1201 prssdp->order = PSF_ORDER_PRSSD;
1202 prssdp->suborder = 0x41; /* Read Feature Codes */
1203 /* all other bytes of prssdp must be zero */
1204
1205 ccw = cqr->cpaddr;
1206 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1207 ccw->count = sizeof(struct dasd_psf_prssd_data);
1208 ccw->flags |= CCW_FLAG_CC;
1209 ccw->cda = (__u32)(addr_t) prssdp;
1210
1211 /* Read Subsystem Data - feature codes */
1212 features = (struct dasd_rssd_features *) (prssdp + 1);
1213 memset(features, 0, sizeof(struct dasd_rssd_features));
1214
1215 ccw++;
1216 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1217 ccw->count = sizeof(struct dasd_rssd_features);
1218 ccw->cda = (__u32)(addr_t) features;
1219
1220 cqr->buildclk = get_clock();
1221 cqr->status = DASD_CQR_FILLED;
1222 rc = dasd_sleep_on(cqr);
1223 if (rc == 0) {
1224 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1225 features = (struct dasd_rssd_features *) (prssdp + 1);
1226 memcpy(&private->features, features,
1227 sizeof(struct dasd_rssd_features));
1228 } else
1229 dev_warn(&device->cdev->dev, "Reading device feature codes"
1230 " failed with rc=%d\n", rc);
1231 dasd_sfree_request(cqr, cqr->memdev);
1232 return rc;
1233 }
1234
1235
1236 /*
1237 * Build CP for Perform Subsystem Function - SSC.
1238 */
1239 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1240 int enable_pav)
1241 {
1242 struct dasd_ccw_req *cqr;
1243 struct dasd_psf_ssc_data *psf_ssc_data;
1244 struct ccw1 *ccw;
1245
1246 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1247 sizeof(struct dasd_psf_ssc_data),
1248 device);
1249
1250 if (IS_ERR(cqr)) {
1251 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1252 "Could not allocate PSF-SSC request");
1253 return cqr;
1254 }
1255 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1256 psf_ssc_data->order = PSF_ORDER_SSC;
1257 psf_ssc_data->suborder = 0xc0;
1258 if (enable_pav) {
1259 psf_ssc_data->suborder |= 0x08;
1260 psf_ssc_data->reserved[0] = 0x88;
1261 }
1262 ccw = cqr->cpaddr;
1263 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1264 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1265 ccw->count = 66;
1266
1267 cqr->startdev = device;
1268 cqr->memdev = device;
1269 cqr->block = NULL;
1270 cqr->retries = 256;
1271 cqr->expires = 10*HZ;
1272 cqr->buildclk = get_clock();
1273 cqr->status = DASD_CQR_FILLED;
1274 return cqr;
1275 }
1276
1277 /*
1278 * Perform Subsystem Function.
1279 * It is necessary to trigger CIO for channel revalidation since this
1280 * call might change behaviour of DASD devices.
1281 */
1282 static int
1283 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1284 {
1285 struct dasd_ccw_req *cqr;
1286 int rc;
1287
1288 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1289 if (IS_ERR(cqr))
1290 return PTR_ERR(cqr);
1291
1292 rc = dasd_sleep_on(cqr);
1293 if (!rc)
1294 /* trigger CIO to reprobe devices */
1295 css_schedule_reprobe();
1296 dasd_sfree_request(cqr, cqr->memdev);
1297 return rc;
1298 }
1299
1300 /*
1301 * Valide storage server of current device.
1302 */
1303 static void dasd_eckd_validate_server(struct dasd_device *device)
1304 {
1305 int rc;
1306 struct dasd_eckd_private *private;
1307 int enable_pav;
1308
1309 if (dasd_nopav || MACHINE_IS_VM)
1310 enable_pav = 0;
1311 else
1312 enable_pav = 1;
1313 rc = dasd_eckd_psf_ssc(device, enable_pav);
1314
1315 /* may be requested feature is not available on server,
1316 * therefore just report error and go ahead */
1317 private = (struct dasd_eckd_private *) device->private;
1318 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1319 "returned rc=%d", private->uid.ssid, rc);
1320 }
1321
1322 static u32 get_fcx_max_data(struct dasd_device *device)
1323 {
1324 #if defined(CONFIG_64BIT)
1325 int tpm, mdc;
1326 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1327 struct dasd_eckd_private *private;
1328
1329 if (dasd_nofcx)
1330 return 0;
1331 /* is transport mode supported? */
1332 private = (struct dasd_eckd_private *) device->private;
1333 fcx_in_css = css_general_characteristics.fcx;
1334 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1335 fcx_in_features = private->features.feature[40] & 0x80;
1336 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1337
1338 if (!tpm)
1339 return 0;
1340
1341 mdc = ccw_device_get_mdc(device->cdev, 0);
1342 if (mdc < 0) {
1343 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1344 " data size for zHPF requests failed\n");
1345 return 0;
1346 } else
1347 return mdc * FCX_MAX_DATA_FACTOR;
1348 #else
1349 return 0;
1350 #endif
1351 }
1352
1353 /*
1354 * Check device characteristics.
1355 * If the device is accessible using ECKD discipline, the device is enabled.
1356 */
1357 static int
1358 dasd_eckd_check_characteristics(struct dasd_device *device)
1359 {
1360 struct dasd_eckd_private *private;
1361 struct dasd_block *block;
1362 struct dasd_uid temp_uid;
1363 int is_known, rc, i;
1364 int readonly;
1365 unsigned long value;
1366
1367 if (!ccw_device_is_pathgroup(device->cdev)) {
1368 dev_warn(&device->cdev->dev,
1369 "A channel path group could not be established\n");
1370 return -EIO;
1371 }
1372 if (!ccw_device_is_multipath(device->cdev)) {
1373 dev_info(&device->cdev->dev,
1374 "The DASD is not operating in multipath mode\n");
1375 }
1376 private = (struct dasd_eckd_private *) device->private;
1377 if (!private) {
1378 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1379 if (!private) {
1380 dev_warn(&device->cdev->dev,
1381 "Allocating memory for private DASD data "
1382 "failed\n");
1383 return -ENOMEM;
1384 }
1385 device->private = (void *) private;
1386 } else {
1387 memset(private, 0, sizeof(*private));
1388 }
1389 /* Invalidate status of initial analysis. */
1390 private->init_cqr_status = -1;
1391 /* Set default cache operations. */
1392 private->attrib.operation = DASD_NORMAL_CACHE;
1393 private->attrib.nr_cyl = 0;
1394
1395 /* Read Configuration Data */
1396 rc = dasd_eckd_read_conf(device);
1397 if (rc)
1398 goto out_err1;
1399
1400 /* set default timeout */
1401 device->default_expires = DASD_EXPIRES;
1402 if (private->gneq) {
1403 value = 1;
1404 for (i = 0; i < private->gneq->timeout.value; i++)
1405 value = 10 * value;
1406 value = value * private->gneq->timeout.number;
1407 /* do not accept useless values */
1408 if (value != 0 && value <= DASD_EXPIRES_MAX)
1409 device->default_expires = value;
1410 }
1411
1412 /* Generate device unique id */
1413 rc = dasd_eckd_generate_uid(device);
1414 if (rc)
1415 goto out_err1;
1416
1417 dasd_eckd_get_uid(device, &temp_uid);
1418 if (temp_uid.type == UA_BASE_DEVICE) {
1419 block = dasd_alloc_block();
1420 if (IS_ERR(block)) {
1421 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1422 "could not allocate dasd "
1423 "block structure");
1424 rc = PTR_ERR(block);
1425 goto out_err1;
1426 }
1427 device->block = block;
1428 block->base = device;
1429 }
1430
1431 /* register lcu with alias handling, enable PAV if this is a new lcu */
1432 is_known = dasd_alias_make_device_known_to_lcu(device);
1433 if (is_known < 0) {
1434 rc = is_known;
1435 goto out_err2;
1436 }
1437 /*
1438 * dasd_eckd_validate_server is done on the first device that
1439 * is found for an LCU. All later other devices have to wait
1440 * for it, so they will read the correct feature codes.
1441 */
1442 if (!is_known) {
1443 dasd_eckd_validate_server(device);
1444 dasd_alias_lcu_setup_complete(device);
1445 } else
1446 dasd_alias_wait_for_lcu_setup(device);
1447
1448 /* device may report different configuration data after LCU setup */
1449 rc = dasd_eckd_read_conf(device);
1450 if (rc)
1451 goto out_err3;
1452
1453 /* Read Feature Codes */
1454 dasd_eckd_read_features(device);
1455
1456 /* Read Device Characteristics */
1457 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1458 &private->rdc_data, 64);
1459 if (rc) {
1460 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1461 "Read device characteristic failed, rc=%d", rc);
1462 goto out_err3;
1463 }
1464
1465 if ((device->features & DASD_FEATURE_USERAW) &&
1466 !(private->rdc_data.facilities.RT_in_LR)) {
1467 dev_err(&device->cdev->dev, "The storage server does not "
1468 "support raw-track access\n");
1469 rc = -EINVAL;
1470 goto out_err3;
1471 }
1472
1473 /* find the valid cylinder size */
1474 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1475 private->rdc_data.long_no_cyl)
1476 private->real_cyl = private->rdc_data.long_no_cyl;
1477 else
1478 private->real_cyl = private->rdc_data.no_cyl;
1479
1480 private->fcx_max_data = get_fcx_max_data(device);
1481
1482 readonly = dasd_device_is_ro(device);
1483 if (readonly)
1484 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1485
1486 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1487 "with %d cylinders, %d heads, %d sectors%s\n",
1488 private->rdc_data.dev_type,
1489 private->rdc_data.dev_model,
1490 private->rdc_data.cu_type,
1491 private->rdc_data.cu_model.model,
1492 private->real_cyl,
1493 private->rdc_data.trk_per_cyl,
1494 private->rdc_data.sec_per_trk,
1495 readonly ? ", read-only device" : "");
1496 return 0;
1497
1498 out_err3:
1499 dasd_alias_disconnect_device_from_lcu(device);
1500 out_err2:
1501 dasd_free_block(device->block);
1502 device->block = NULL;
1503 out_err1:
1504 kfree(private->conf_data);
1505 kfree(device->private);
1506 device->private = NULL;
1507 return rc;
1508 }
1509
1510 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1511 {
1512 struct dasd_eckd_private *private;
1513
1514 private = (struct dasd_eckd_private *) device->private;
1515 dasd_alias_disconnect_device_from_lcu(device);
1516 private->ned = NULL;
1517 private->sneq = NULL;
1518 private->vdsneq = NULL;
1519 private->gneq = NULL;
1520 private->conf_len = 0;
1521 kfree(private->conf_data);
1522 private->conf_data = NULL;
1523 }
1524
1525 static struct dasd_ccw_req *
1526 dasd_eckd_analysis_ccw(struct dasd_device *device)
1527 {
1528 struct dasd_eckd_private *private;
1529 struct eckd_count *count_data;
1530 struct LO_eckd_data *LO_data;
1531 struct dasd_ccw_req *cqr;
1532 struct ccw1 *ccw;
1533 int cplength, datasize;
1534 int i;
1535
1536 private = (struct dasd_eckd_private *) device->private;
1537
1538 cplength = 8;
1539 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1540 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1541 if (IS_ERR(cqr))
1542 return cqr;
1543 ccw = cqr->cpaddr;
1544 /* Define extent for the first 3 tracks. */
1545 define_extent(ccw++, cqr->data, 0, 2,
1546 DASD_ECKD_CCW_READ_COUNT, device);
1547 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1548 /* Locate record for the first 4 records on track 0. */
1549 ccw[-1].flags |= CCW_FLAG_CC;
1550 locate_record(ccw++, LO_data++, 0, 0, 4,
1551 DASD_ECKD_CCW_READ_COUNT, device, 0);
1552
1553 count_data = private->count_area;
1554 for (i = 0; i < 4; i++) {
1555 ccw[-1].flags |= CCW_FLAG_CC;
1556 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1557 ccw->flags = 0;
1558 ccw->count = 8;
1559 ccw->cda = (__u32)(addr_t) count_data;
1560 ccw++;
1561 count_data++;
1562 }
1563
1564 /* Locate record for the first record on track 2. */
1565 ccw[-1].flags |= CCW_FLAG_CC;
1566 locate_record(ccw++, LO_data++, 2, 0, 1,
1567 DASD_ECKD_CCW_READ_COUNT, device, 0);
1568 /* Read count ccw. */
1569 ccw[-1].flags |= CCW_FLAG_CC;
1570 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1571 ccw->flags = 0;
1572 ccw->count = 8;
1573 ccw->cda = (__u32)(addr_t) count_data;
1574
1575 cqr->block = NULL;
1576 cqr->startdev = device;
1577 cqr->memdev = device;
1578 cqr->retries = 255;
1579 cqr->buildclk = get_clock();
1580 cqr->status = DASD_CQR_FILLED;
1581 return cqr;
1582 }
1583
1584 /* differentiate between 'no record found' and any other error */
1585 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1586 {
1587 char *sense;
1588 if (init_cqr->status == DASD_CQR_DONE)
1589 return INIT_CQR_OK;
1590 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1591 init_cqr->status == DASD_CQR_FAILED) {
1592 sense = dasd_get_sense(&init_cqr->irb);
1593 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1594 return INIT_CQR_UNFORMATTED;
1595 else
1596 return INIT_CQR_ERROR;
1597 } else
1598 return INIT_CQR_ERROR;
1599 }
1600
1601 /*
1602 * This is the callback function for the init_analysis cqr. It saves
1603 * the status of the initial analysis ccw before it frees it and kicks
1604 * the device to continue the startup sequence. This will call
1605 * dasd_eckd_do_analysis again (if the devices has not been marked
1606 * for deletion in the meantime).
1607 */
1608 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1609 void *data)
1610 {
1611 struct dasd_eckd_private *private;
1612 struct dasd_device *device;
1613
1614 device = init_cqr->startdev;
1615 private = (struct dasd_eckd_private *) device->private;
1616 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1617 dasd_sfree_request(init_cqr, device);
1618 dasd_kick_device(device);
1619 }
1620
1621 static int dasd_eckd_start_analysis(struct dasd_block *block)
1622 {
1623 struct dasd_ccw_req *init_cqr;
1624
1625 init_cqr = dasd_eckd_analysis_ccw(block->base);
1626 if (IS_ERR(init_cqr))
1627 return PTR_ERR(init_cqr);
1628 init_cqr->callback = dasd_eckd_analysis_callback;
1629 init_cqr->callback_data = NULL;
1630 init_cqr->expires = 5*HZ;
1631 /* first try without ERP, so we can later handle unformatted
1632 * devices as special case
1633 */
1634 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1635 init_cqr->retries = 0;
1636 dasd_add_request_head(init_cqr);
1637 return -EAGAIN;
1638 }
1639
1640 static int dasd_eckd_end_analysis(struct dasd_block *block)
1641 {
1642 struct dasd_device *device;
1643 struct dasd_eckd_private *private;
1644 struct eckd_count *count_area;
1645 unsigned int sb, blk_per_trk;
1646 int status, i;
1647 struct dasd_ccw_req *init_cqr;
1648
1649 device = block->base;
1650 private = (struct dasd_eckd_private *) device->private;
1651 status = private->init_cqr_status;
1652 private->init_cqr_status = -1;
1653 if (status == INIT_CQR_ERROR) {
1654 /* try again, this time with full ERP */
1655 init_cqr = dasd_eckd_analysis_ccw(device);
1656 dasd_sleep_on(init_cqr);
1657 status = dasd_eckd_analysis_evaluation(init_cqr);
1658 dasd_sfree_request(init_cqr, device);
1659 }
1660
1661 if (device->features & DASD_FEATURE_USERAW) {
1662 block->bp_block = DASD_RAW_BLOCKSIZE;
1663 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1664 block->s2b_shift = 3;
1665 goto raw;
1666 }
1667
1668 if (status == INIT_CQR_UNFORMATTED) {
1669 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1670 return -EMEDIUMTYPE;
1671 } else if (status == INIT_CQR_ERROR) {
1672 dev_err(&device->cdev->dev,
1673 "Detecting the DASD disk layout failed because "
1674 "of an I/O error\n");
1675 return -EIO;
1676 }
1677
1678 private->uses_cdl = 1;
1679 /* Check Track 0 for Compatible Disk Layout */
1680 count_area = NULL;
1681 for (i = 0; i < 3; i++) {
1682 if (private->count_area[i].kl != 4 ||
1683 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1684 private->uses_cdl = 0;
1685 break;
1686 }
1687 }
1688 if (i == 3)
1689 count_area = &private->count_area[4];
1690
1691 if (private->uses_cdl == 0) {
1692 for (i = 0; i < 5; i++) {
1693 if ((private->count_area[i].kl != 0) ||
1694 (private->count_area[i].dl !=
1695 private->count_area[0].dl))
1696 break;
1697 }
1698 if (i == 5)
1699 count_area = &private->count_area[0];
1700 } else {
1701 if (private->count_area[3].record == 1)
1702 dev_warn(&device->cdev->dev,
1703 "Track 0 has no records following the VTOC\n");
1704 }
1705
1706 if (count_area != NULL && count_area->kl == 0) {
1707 /* we found notthing violating our disk layout */
1708 if (dasd_check_blocksize(count_area->dl) == 0)
1709 block->bp_block = count_area->dl;
1710 }
1711 if (block->bp_block == 0) {
1712 dev_warn(&device->cdev->dev,
1713 "The disk layout of the DASD is not supported\n");
1714 return -EMEDIUMTYPE;
1715 }
1716 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1717 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1718 block->s2b_shift++;
1719
1720 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1721
1722 raw:
1723 block->blocks = (private->real_cyl *
1724 private->rdc_data.trk_per_cyl *
1725 blk_per_trk);
1726
1727 dev_info(&device->cdev->dev,
1728 "DASD with %d KB/block, %d KB total size, %d KB/track, "
1729 "%s\n", (block->bp_block >> 10),
1730 ((private->real_cyl *
1731 private->rdc_data.trk_per_cyl *
1732 blk_per_trk * (block->bp_block >> 9)) >> 1),
1733 ((blk_per_trk * block->bp_block) >> 10),
1734 private->uses_cdl ?
1735 "compatible disk layout" : "linux disk layout");
1736
1737 return 0;
1738 }
1739
1740 static int dasd_eckd_do_analysis(struct dasd_block *block)
1741 {
1742 struct dasd_eckd_private *private;
1743
1744 private = (struct dasd_eckd_private *) block->base->private;
1745 if (private->init_cqr_status < 0)
1746 return dasd_eckd_start_analysis(block);
1747 else
1748 return dasd_eckd_end_analysis(block);
1749 }
1750
1751 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1752 {
1753 return dasd_alias_add_device(device);
1754 };
1755
1756 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1757 {
1758 cancel_work_sync(&device->reload_device);
1759 return dasd_alias_remove_device(device);
1760 };
1761
1762 static int
1763 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1764 {
1765 struct dasd_eckd_private *private;
1766
1767 private = (struct dasd_eckd_private *) block->base->private;
1768 if (dasd_check_blocksize(block->bp_block) == 0) {
1769 geo->sectors = recs_per_track(&private->rdc_data,
1770 0, block->bp_block);
1771 }
1772 geo->cylinders = private->rdc_data.no_cyl;
1773 geo->heads = private->rdc_data.trk_per_cyl;
1774 return 0;
1775 }
1776
1777 static struct dasd_ccw_req *
1778 dasd_eckd_format_device(struct dasd_device * device,
1779 struct format_data_t * fdata)
1780 {
1781 struct dasd_eckd_private *private;
1782 struct dasd_ccw_req *fcp;
1783 struct eckd_count *ect;
1784 struct ccw1 *ccw;
1785 void *data;
1786 int rpt;
1787 struct ch_t address;
1788 int cplength, datasize;
1789 int i;
1790 int intensity = 0;
1791 int r0_perm;
1792
1793 private = (struct dasd_eckd_private *) device->private;
1794 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1795 set_ch_t(&address,
1796 fdata->start_unit / private->rdc_data.trk_per_cyl,
1797 fdata->start_unit % private->rdc_data.trk_per_cyl);
1798
1799 /* Sanity checks. */
1800 if (fdata->start_unit >=
1801 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1802 dev_warn(&device->cdev->dev, "Start track number %d used in "
1803 "formatting is too big\n", fdata->start_unit);
1804 return ERR_PTR(-EINVAL);
1805 }
1806 if (fdata->start_unit > fdata->stop_unit) {
1807 dev_warn(&device->cdev->dev, "Start track %d used in "
1808 "formatting exceeds end track\n", fdata->start_unit);
1809 return ERR_PTR(-EINVAL);
1810 }
1811 if (dasd_check_blocksize(fdata->blksize) != 0) {
1812 dev_warn(&device->cdev->dev,
1813 "The DASD cannot be formatted with block size %d\n",
1814 fdata->blksize);
1815 return ERR_PTR(-EINVAL);
1816 }
1817
1818 /*
1819 * fdata->intensity is a bit string that tells us what to do:
1820 * Bit 0: write record zero
1821 * Bit 1: write home address, currently not supported
1822 * Bit 2: invalidate tracks
1823 * Bit 3: use OS/390 compatible disk layout (cdl)
1824 * Bit 4: do not allow storage subsystem to modify record zero
1825 * Only some bit combinations do make sense.
1826 */
1827 if (fdata->intensity & 0x10) {
1828 r0_perm = 0;
1829 intensity = fdata->intensity & ~0x10;
1830 } else {
1831 r0_perm = 1;
1832 intensity = fdata->intensity;
1833 }
1834 switch (intensity) {
1835 case 0x00: /* Normal format */
1836 case 0x08: /* Normal format, use cdl. */
1837 cplength = 2 + rpt;
1838 datasize = sizeof(struct DE_eckd_data) +
1839 sizeof(struct LO_eckd_data) +
1840 rpt * sizeof(struct eckd_count);
1841 break;
1842 case 0x01: /* Write record zero and format track. */
1843 case 0x09: /* Write record zero and format track, use cdl. */
1844 cplength = 3 + rpt;
1845 datasize = sizeof(struct DE_eckd_data) +
1846 sizeof(struct LO_eckd_data) +
1847 sizeof(struct eckd_count) +
1848 rpt * sizeof(struct eckd_count);
1849 break;
1850 case 0x04: /* Invalidate track. */
1851 case 0x0c: /* Invalidate track, use cdl. */
1852 cplength = 3;
1853 datasize = sizeof(struct DE_eckd_data) +
1854 sizeof(struct LO_eckd_data) +
1855 sizeof(struct eckd_count);
1856 break;
1857 default:
1858 dev_warn(&device->cdev->dev, "An I/O control call used "
1859 "incorrect flags 0x%x\n", fdata->intensity);
1860 return ERR_PTR(-EINVAL);
1861 }
1862 /* Allocate the format ccw request. */
1863 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1864 if (IS_ERR(fcp))
1865 return fcp;
1866
1867 data = fcp->data;
1868 ccw = fcp->cpaddr;
1869
1870 switch (intensity & ~0x08) {
1871 case 0x00: /* Normal format. */
1872 define_extent(ccw++, (struct DE_eckd_data *) data,
1873 fdata->start_unit, fdata->start_unit,
1874 DASD_ECKD_CCW_WRITE_CKD, device);
1875 /* grant subsystem permission to format R0 */
1876 if (r0_perm)
1877 ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1878 data += sizeof(struct DE_eckd_data);
1879 ccw[-1].flags |= CCW_FLAG_CC;
1880 locate_record(ccw++, (struct LO_eckd_data *) data,
1881 fdata->start_unit, 0, rpt,
1882 DASD_ECKD_CCW_WRITE_CKD, device,
1883 fdata->blksize);
1884 data += sizeof(struct LO_eckd_data);
1885 break;
1886 case 0x01: /* Write record zero + format track. */
1887 define_extent(ccw++, (struct DE_eckd_data *) data,
1888 fdata->start_unit, fdata->start_unit,
1889 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1890 device);
1891 data += sizeof(struct DE_eckd_data);
1892 ccw[-1].flags |= CCW_FLAG_CC;
1893 locate_record(ccw++, (struct LO_eckd_data *) data,
1894 fdata->start_unit, 0, rpt + 1,
1895 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1896 device->block->bp_block);
1897 data += sizeof(struct LO_eckd_data);
1898 break;
1899 case 0x04: /* Invalidate track. */
1900 define_extent(ccw++, (struct DE_eckd_data *) data,
1901 fdata->start_unit, fdata->start_unit,
1902 DASD_ECKD_CCW_WRITE_CKD, device);
1903 data += sizeof(struct DE_eckd_data);
1904 ccw[-1].flags |= CCW_FLAG_CC;
1905 locate_record(ccw++, (struct LO_eckd_data *) data,
1906 fdata->start_unit, 0, 1,
1907 DASD_ECKD_CCW_WRITE_CKD, device, 8);
1908 data += sizeof(struct LO_eckd_data);
1909 break;
1910 }
1911 if (intensity & 0x01) { /* write record zero */
1912 ect = (struct eckd_count *) data;
1913 data += sizeof(struct eckd_count);
1914 ect->cyl = address.cyl;
1915 ect->head = address.head;
1916 ect->record = 0;
1917 ect->kl = 0;
1918 ect->dl = 8;
1919 ccw[-1].flags |= CCW_FLAG_CC;
1920 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1921 ccw->flags = CCW_FLAG_SLI;
1922 ccw->count = 8;
1923 ccw->cda = (__u32)(addr_t) ect;
1924 ccw++;
1925 }
1926 if ((intensity & ~0x08) & 0x04) { /* erase track */
1927 ect = (struct eckd_count *) data;
1928 data += sizeof(struct eckd_count);
1929 ect->cyl = address.cyl;
1930 ect->head = address.head;
1931 ect->record = 1;
1932 ect->kl = 0;
1933 ect->dl = 0;
1934 ccw[-1].flags |= CCW_FLAG_CC;
1935 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1936 ccw->flags = CCW_FLAG_SLI;
1937 ccw->count = 8;
1938 ccw->cda = (__u32)(addr_t) ect;
1939 } else { /* write remaining records */
1940 for (i = 0; i < rpt; i++) {
1941 ect = (struct eckd_count *) data;
1942 data += sizeof(struct eckd_count);
1943 ect->cyl = address.cyl;
1944 ect->head = address.head;
1945 ect->record = i + 1;
1946 ect->kl = 0;
1947 ect->dl = fdata->blksize;
1948 /* Check for special tracks 0-1 when formatting CDL */
1949 if ((intensity & 0x08) &&
1950 fdata->start_unit == 0) {
1951 if (i < 3) {
1952 ect->kl = 4;
1953 ect->dl = sizes_trk0[i] - 4;
1954 }
1955 }
1956 if ((intensity & 0x08) &&
1957 fdata->start_unit == 1) {
1958 ect->kl = 44;
1959 ect->dl = LABEL_SIZE - 44;
1960 }
1961 ccw[-1].flags |= CCW_FLAG_CC;
1962 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1963 ccw->flags = CCW_FLAG_SLI;
1964 ccw->count = 8;
1965 ccw->cda = (__u32)(addr_t) ect;
1966 ccw++;
1967 }
1968 }
1969 fcp->startdev = device;
1970 fcp->memdev = device;
1971 fcp->retries = 256;
1972 fcp->buildclk = get_clock();
1973 fcp->status = DASD_CQR_FILLED;
1974 return fcp;
1975 }
1976
1977 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1978 {
1979 cqr->status = DASD_CQR_FILLED;
1980 if (cqr->block && (cqr->startdev != cqr->block->base)) {
1981 dasd_eckd_reset_ccw_to_base_io(cqr);
1982 cqr->startdev = cqr->block->base;
1983 cqr->lpm = cqr->block->base->path_data.opm;
1984 }
1985 };
1986
1987 static dasd_erp_fn_t
1988 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1989 {
1990 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1991 struct ccw_device *cdev = device->cdev;
1992
1993 switch (cdev->id.cu_type) {
1994 case 0x3990:
1995 case 0x2105:
1996 case 0x2107:
1997 case 0x1750:
1998 return dasd_3990_erp_action;
1999 case 0x9343:
2000 case 0x3880:
2001 default:
2002 return dasd_default_erp_action;
2003 }
2004 }
2005
2006 static dasd_erp_fn_t
2007 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2008 {
2009 return dasd_default_erp_postaction;
2010 }
2011
2012 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2013 struct dasd_ccw_req *cqr,
2014 struct irb *irb)
2015 {
2016 char mask;
2017 char *sense = NULL;
2018 struct dasd_eckd_private *private;
2019
2020 private = (struct dasd_eckd_private *) device->private;
2021 /* first of all check for state change pending interrupt */
2022 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2023 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2024 /* for alias only and not in offline processing*/
2025 if (!device->block && private->lcu &&
2026 !test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2027 /*
2028 * the state change could be caused by an alias
2029 * reassignment remove device from alias handling
2030 * to prevent new requests from being scheduled on
2031 * the wrong alias device
2032 */
2033 dasd_alias_remove_device(device);
2034
2035 /* schedule worker to reload device */
2036 dasd_reload_device(device);
2037 }
2038 dasd_generic_handle_state_change(device);
2039 return;
2040 }
2041
2042 sense = dasd_get_sense(irb);
2043 if (!sense)
2044 return;
2045
2046 /* summary unit check */
2047 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2048 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2049 dasd_alias_handle_summary_unit_check(device, irb);
2050 return;
2051 }
2052
2053 /* service information message SIM */
2054 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2055 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2056 dasd_3990_erp_handle_sim(device, sense);
2057 return;
2058 }
2059
2060 /* loss of device reservation is handled via base devices only
2061 * as alias devices may be used with several bases
2062 */
2063 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2064 (sense[7] == 0x3F) &&
2065 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2066 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2067 if (device->features & DASD_FEATURE_FAILONSLCK)
2068 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2069 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2070 dev_err(&device->cdev->dev,
2071 "The device reservation was lost\n");
2072 }
2073 }
2074
2075 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2076 struct dasd_device *startdev,
2077 struct dasd_block *block,
2078 struct request *req,
2079 sector_t first_rec,
2080 sector_t last_rec,
2081 sector_t first_trk,
2082 sector_t last_trk,
2083 unsigned int first_offs,
2084 unsigned int last_offs,
2085 unsigned int blk_per_trk,
2086 unsigned int blksize)
2087 {
2088 struct dasd_eckd_private *private;
2089 unsigned long *idaws;
2090 struct LO_eckd_data *LO_data;
2091 struct dasd_ccw_req *cqr;
2092 struct ccw1 *ccw;
2093 struct req_iterator iter;
2094 struct bio_vec *bv;
2095 char *dst;
2096 unsigned int off;
2097 int count, cidaw, cplength, datasize;
2098 sector_t recid;
2099 unsigned char cmd, rcmd;
2100 int use_prefix;
2101 struct dasd_device *basedev;
2102
2103 basedev = block->base;
2104 private = (struct dasd_eckd_private *) basedev->private;
2105 if (rq_data_dir(req) == READ)
2106 cmd = DASD_ECKD_CCW_READ_MT;
2107 else if (rq_data_dir(req) == WRITE)
2108 cmd = DASD_ECKD_CCW_WRITE_MT;
2109 else
2110 return ERR_PTR(-EINVAL);
2111
2112 /* Check struct bio and count the number of blocks for the request. */
2113 count = 0;
2114 cidaw = 0;
2115 rq_for_each_segment(bv, req, iter) {
2116 if (bv->bv_len & (blksize - 1))
2117 /* Eckd can only do full blocks. */
2118 return ERR_PTR(-EINVAL);
2119 count += bv->bv_len >> (block->s2b_shift + 9);
2120 #if defined(CONFIG_64BIT)
2121 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2122 cidaw += bv->bv_len >> (block->s2b_shift + 9);
2123 #endif
2124 }
2125 /* Paranoia. */
2126 if (count != last_rec - first_rec + 1)
2127 return ERR_PTR(-EINVAL);
2128
2129 /* use the prefix command if available */
2130 use_prefix = private->features.feature[8] & 0x01;
2131 if (use_prefix) {
2132 /* 1x prefix + number of blocks */
2133 cplength = 2 + count;
2134 /* 1x prefix + cidaws*sizeof(long) */
2135 datasize = sizeof(struct PFX_eckd_data) +
2136 sizeof(struct LO_eckd_data) +
2137 cidaw * sizeof(unsigned long);
2138 } else {
2139 /* 1x define extent + 1x locate record + number of blocks */
2140 cplength = 2 + count;
2141 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2142 datasize = sizeof(struct DE_eckd_data) +
2143 sizeof(struct LO_eckd_data) +
2144 cidaw * sizeof(unsigned long);
2145 }
2146 /* Find out the number of additional locate record ccws for cdl. */
2147 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2148 if (last_rec >= 2*blk_per_trk)
2149 count = 2*blk_per_trk - first_rec;
2150 cplength += count;
2151 datasize += count*sizeof(struct LO_eckd_data);
2152 }
2153 /* Allocate the ccw request. */
2154 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2155 startdev);
2156 if (IS_ERR(cqr))
2157 return cqr;
2158 ccw = cqr->cpaddr;
2159 /* First ccw is define extent or prefix. */
2160 if (use_prefix) {
2161 if (prefix(ccw++, cqr->data, first_trk,
2162 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2163 /* Clock not in sync and XRC is enabled.
2164 * Try again later.
2165 */
2166 dasd_sfree_request(cqr, startdev);
2167 return ERR_PTR(-EAGAIN);
2168 }
2169 idaws = (unsigned long *) (cqr->data +
2170 sizeof(struct PFX_eckd_data));
2171 } else {
2172 if (define_extent(ccw++, cqr->data, first_trk,
2173 last_trk, cmd, startdev) == -EAGAIN) {
2174 /* Clock not in sync and XRC is enabled.
2175 * Try again later.
2176 */
2177 dasd_sfree_request(cqr, startdev);
2178 return ERR_PTR(-EAGAIN);
2179 }
2180 idaws = (unsigned long *) (cqr->data +
2181 sizeof(struct DE_eckd_data));
2182 }
2183 /* Build locate_record+read/write/ccws. */
2184 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2185 recid = first_rec;
2186 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2187 /* Only standard blocks so there is just one locate record. */
2188 ccw[-1].flags |= CCW_FLAG_CC;
2189 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2190 last_rec - recid + 1, cmd, basedev, blksize);
2191 }
2192 rq_for_each_segment(bv, req, iter) {
2193 dst = page_address(bv->bv_page) + bv->bv_offset;
2194 if (dasd_page_cache) {
2195 char *copy = kmem_cache_alloc(dasd_page_cache,
2196 GFP_DMA | __GFP_NOWARN);
2197 if (copy && rq_data_dir(req) == WRITE)
2198 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2199 if (copy)
2200 dst = copy + bv->bv_offset;
2201 }
2202 for (off = 0; off < bv->bv_len; off += blksize) {
2203 sector_t trkid = recid;
2204 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2205 rcmd = cmd;
2206 count = blksize;
2207 /* Locate record for cdl special block ? */
2208 if (private->uses_cdl && recid < 2*blk_per_trk) {
2209 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2210 rcmd |= 0x8;
2211 count = dasd_eckd_cdl_reclen(recid);
2212 if (count < blksize &&
2213 rq_data_dir(req) == READ)
2214 memset(dst + count, 0xe5,
2215 blksize - count);
2216 }
2217 ccw[-1].flags |= CCW_FLAG_CC;
2218 locate_record(ccw++, LO_data++,
2219 trkid, recoffs + 1,
2220 1, rcmd, basedev, count);
2221 }
2222 /* Locate record for standard blocks ? */
2223 if (private->uses_cdl && recid == 2*blk_per_trk) {
2224 ccw[-1].flags |= CCW_FLAG_CC;
2225 locate_record(ccw++, LO_data++,
2226 trkid, recoffs + 1,
2227 last_rec - recid + 1,
2228 cmd, basedev, count);
2229 }
2230 /* Read/write ccw. */
2231 ccw[-1].flags |= CCW_FLAG_CC;
2232 ccw->cmd_code = rcmd;
2233 ccw->count = count;
2234 if (idal_is_needed(dst, blksize)) {
2235 ccw->cda = (__u32)(addr_t) idaws;
2236 ccw->flags = CCW_FLAG_IDA;
2237 idaws = idal_create_words(idaws, dst, blksize);
2238 } else {
2239 ccw->cda = (__u32)(addr_t) dst;
2240 ccw->flags = 0;
2241 }
2242 ccw++;
2243 dst += blksize;
2244 recid++;
2245 }
2246 }
2247 if (blk_noretry_request(req) ||
2248 block->base->features & DASD_FEATURE_FAILFAST)
2249 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2250 cqr->startdev = startdev;
2251 cqr->memdev = startdev;
2252 cqr->block = block;
2253 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2254 cqr->lpm = startdev->path_data.ppm;
2255 cqr->retries = 256;
2256 cqr->buildclk = get_clock();
2257 cqr->status = DASD_CQR_FILLED;
2258 return cqr;
2259 }
2260
2261 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2262 struct dasd_device *startdev,
2263 struct dasd_block *block,
2264 struct request *req,
2265 sector_t first_rec,
2266 sector_t last_rec,
2267 sector_t first_trk,
2268 sector_t last_trk,
2269 unsigned int first_offs,
2270 unsigned int last_offs,
2271 unsigned int blk_per_trk,
2272 unsigned int blksize)
2273 {
2274 unsigned long *idaws;
2275 struct dasd_ccw_req *cqr;
2276 struct ccw1 *ccw;
2277 struct req_iterator iter;
2278 struct bio_vec *bv;
2279 char *dst, *idaw_dst;
2280 unsigned int cidaw, cplength, datasize;
2281 unsigned int tlf;
2282 sector_t recid;
2283 unsigned char cmd;
2284 struct dasd_device *basedev;
2285 unsigned int trkcount, count, count_to_trk_end;
2286 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2287 unsigned char new_track, end_idaw;
2288 sector_t trkid;
2289 unsigned int recoffs;
2290
2291 basedev = block->base;
2292 if (rq_data_dir(req) == READ)
2293 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2294 else if (rq_data_dir(req) == WRITE)
2295 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2296 else
2297 return ERR_PTR(-EINVAL);
2298
2299 /* Track based I/O needs IDAWs for each page, and not just for
2300 * 64 bit addresses. We need additional idals for pages
2301 * that get filled from two tracks, so we use the number
2302 * of records as upper limit.
2303 */
2304 cidaw = last_rec - first_rec + 1;
2305 trkcount = last_trk - first_trk + 1;
2306
2307 /* 1x prefix + one read/write ccw per track */
2308 cplength = 1 + trkcount;
2309
2310 /* on 31-bit we need space for two 32 bit addresses per page
2311 * on 64-bit one 64 bit address
2312 */
2313 datasize = sizeof(struct PFX_eckd_data) +
2314 cidaw * sizeof(unsigned long long);
2315
2316 /* Allocate the ccw request. */
2317 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2318 startdev);
2319 if (IS_ERR(cqr))
2320 return cqr;
2321 ccw = cqr->cpaddr;
2322 /* transfer length factor: how many bytes to read from the last track */
2323 if (first_trk == last_trk)
2324 tlf = last_offs - first_offs + 1;
2325 else
2326 tlf = last_offs + 1;
2327 tlf *= blksize;
2328
2329 if (prefix_LRE(ccw++, cqr->data, first_trk,
2330 last_trk, cmd, basedev, startdev,
2331 1 /* format */, first_offs + 1,
2332 trkcount, blksize,
2333 tlf) == -EAGAIN) {
2334 /* Clock not in sync and XRC is enabled.
2335 * Try again later.
2336 */
2337 dasd_sfree_request(cqr, startdev);
2338 return ERR_PTR(-EAGAIN);
2339 }
2340
2341 /*
2342 * The translation of request into ccw programs must meet the
2343 * following conditions:
2344 * - all idaws but the first and the last must address full pages
2345 * (or 2K blocks on 31-bit)
2346 * - the scope of a ccw and it's idal ends with the track boundaries
2347 */
2348 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2349 recid = first_rec;
2350 new_track = 1;
2351 end_idaw = 0;
2352 len_to_track_end = 0;
2353 idaw_dst = 0;
2354 idaw_len = 0;
2355 rq_for_each_segment(bv, req, iter) {
2356 dst = page_address(bv->bv_page) + bv->bv_offset;
2357 seg_len = bv->bv_len;
2358 while (seg_len) {
2359 if (new_track) {
2360 trkid = recid;
2361 recoffs = sector_div(trkid, blk_per_trk);
2362 count_to_trk_end = blk_per_trk - recoffs;
2363 count = min((last_rec - recid + 1),
2364 (sector_t)count_to_trk_end);
2365 len_to_track_end = count * blksize;
2366 ccw[-1].flags |= CCW_FLAG_CC;
2367 ccw->cmd_code = cmd;
2368 ccw->count = len_to_track_end;
2369 ccw->cda = (__u32)(addr_t)idaws;
2370 ccw->flags = CCW_FLAG_IDA;
2371 ccw++;
2372 recid += count;
2373 new_track = 0;
2374 /* first idaw for a ccw may start anywhere */
2375 if (!idaw_dst)
2376 idaw_dst = dst;
2377 }
2378 /* If we start a new idaw, we must make sure that it
2379 * starts on an IDA_BLOCK_SIZE boundary.
2380 * If we continue an idaw, we must make sure that the
2381 * current segment begins where the so far accumulated
2382 * idaw ends
2383 */
2384 if (!idaw_dst) {
2385 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2386 dasd_sfree_request(cqr, startdev);
2387 return ERR_PTR(-ERANGE);
2388 } else
2389 idaw_dst = dst;
2390 }
2391 if ((idaw_dst + idaw_len) != dst) {
2392 dasd_sfree_request(cqr, startdev);
2393 return ERR_PTR(-ERANGE);
2394 }
2395 part_len = min(seg_len, len_to_track_end);
2396 seg_len -= part_len;
2397 dst += part_len;
2398 idaw_len += part_len;
2399 len_to_track_end -= part_len;
2400 /* collected memory area ends on an IDA_BLOCK border,
2401 * -> create an idaw
2402 * idal_create_words will handle cases where idaw_len
2403 * is larger then IDA_BLOCK_SIZE
2404 */
2405 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2406 end_idaw = 1;
2407 /* We also need to end the idaw at track end */
2408 if (!len_to_track_end) {
2409 new_track = 1;
2410 end_idaw = 1;
2411 }
2412 if (end_idaw) {
2413 idaws = idal_create_words(idaws, idaw_dst,
2414 idaw_len);
2415 idaw_dst = 0;
2416 idaw_len = 0;
2417 end_idaw = 0;
2418 }
2419 }
2420 }
2421
2422 if (blk_noretry_request(req) ||
2423 block->base->features & DASD_FEATURE_FAILFAST)
2424 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2425 cqr->startdev = startdev;
2426 cqr->memdev = startdev;
2427 cqr->block = block;
2428 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2429 cqr->lpm = startdev->path_data.ppm;
2430 cqr->retries = 256;
2431 cqr->buildclk = get_clock();
2432 cqr->status = DASD_CQR_FILLED;
2433 return cqr;
2434 }
2435
2436 static int prepare_itcw(struct itcw *itcw,
2437 unsigned int trk, unsigned int totrk, int cmd,
2438 struct dasd_device *basedev,
2439 struct dasd_device *startdev,
2440 unsigned int rec_on_trk, int count,
2441 unsigned int blksize,
2442 unsigned int total_data_size,
2443 unsigned int tlf,
2444 unsigned int blk_per_trk)
2445 {
2446 struct PFX_eckd_data pfxdata;
2447 struct dasd_eckd_private *basepriv, *startpriv;
2448 struct DE_eckd_data *dedata;
2449 struct LRE_eckd_data *lredata;
2450 struct dcw *dcw;
2451
2452 u32 begcyl, endcyl;
2453 u16 heads, beghead, endhead;
2454 u8 pfx_cmd;
2455
2456 int rc = 0;
2457 int sector = 0;
2458 int dn, d;
2459
2460
2461 /* setup prefix data */
2462 basepriv = (struct dasd_eckd_private *) basedev->private;
2463 startpriv = (struct dasd_eckd_private *) startdev->private;
2464 dedata = &pfxdata.define_extent;
2465 lredata = &pfxdata.locate_record;
2466
2467 memset(&pfxdata, 0, sizeof(pfxdata));
2468 pfxdata.format = 1; /* PFX with LRE */
2469 pfxdata.base_address = basepriv->ned->unit_addr;
2470 pfxdata.base_lss = basepriv->ned->ID;
2471 pfxdata.validity.define_extent = 1;
2472
2473 /* private uid is kept up to date, conf_data may be outdated */
2474 if (startpriv->uid.type != UA_BASE_DEVICE) {
2475 pfxdata.validity.verify_base = 1;
2476 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2477 pfxdata.validity.hyper_pav = 1;
2478 }
2479
2480 switch (cmd) {
2481 case DASD_ECKD_CCW_READ_TRACK_DATA:
2482 dedata->mask.perm = 0x1;
2483 dedata->attributes.operation = basepriv->attrib.operation;
2484 dedata->blk_size = blksize;
2485 dedata->ga_extended |= 0x42;
2486 lredata->operation.orientation = 0x0;
2487 lredata->operation.operation = 0x0C;
2488 lredata->auxiliary.check_bytes = 0x01;
2489 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2490 break;
2491 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2492 dedata->mask.perm = 0x02;
2493 dedata->attributes.operation = basepriv->attrib.operation;
2494 dedata->blk_size = blksize;
2495 rc = check_XRC_on_prefix(&pfxdata, basedev);
2496 dedata->ga_extended |= 0x42;
2497 lredata->operation.orientation = 0x0;
2498 lredata->operation.operation = 0x3F;
2499 lredata->extended_operation = 0x23;
2500 lredata->auxiliary.check_bytes = 0x2;
2501 pfx_cmd = DASD_ECKD_CCW_PFX;
2502 break;
2503 default:
2504 DBF_DEV_EVENT(DBF_ERR, basedev,
2505 "prepare itcw, unknown opcode 0x%x", cmd);
2506 BUG();
2507 break;
2508 }
2509 if (rc)
2510 return rc;
2511
2512 dedata->attributes.mode = 0x3; /* ECKD */
2513
2514 heads = basepriv->rdc_data.trk_per_cyl;
2515 begcyl = trk / heads;
2516 beghead = trk % heads;
2517 endcyl = totrk / heads;
2518 endhead = totrk % heads;
2519
2520 /* check for sequential prestage - enhance cylinder range */
2521 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2522 dedata->attributes.operation == DASD_SEQ_ACCESS) {
2523
2524 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2525 endcyl += basepriv->attrib.nr_cyl;
2526 else
2527 endcyl = (basepriv->real_cyl - 1);
2528 }
2529
2530 set_ch_t(&dedata->beg_ext, begcyl, beghead);
2531 set_ch_t(&dedata->end_ext, endcyl, endhead);
2532
2533 dedata->ep_format = 0x20; /* records per track is valid */
2534 dedata->ep_rec_per_track = blk_per_trk;
2535
2536 if (rec_on_trk) {
2537 switch (basepriv->rdc_data.dev_type) {
2538 case 0x3390:
2539 dn = ceil_quot(blksize + 6, 232);
2540 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2541 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2542 break;
2543 case 0x3380:
2544 d = 7 + ceil_quot(blksize + 12, 32);
2545 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2546 break;
2547 }
2548 }
2549
2550 lredata->auxiliary.length_valid = 1;
2551 lredata->auxiliary.length_scope = 1;
2552 lredata->auxiliary.imbedded_ccw_valid = 1;
2553 lredata->length = tlf;
2554 lredata->imbedded_ccw = cmd;
2555 lredata->count = count;
2556 lredata->sector = sector;
2557 set_ch_t(&lredata->seek_addr, begcyl, beghead);
2558 lredata->search_arg.cyl = lredata->seek_addr.cyl;
2559 lredata->search_arg.head = lredata->seek_addr.head;
2560 lredata->search_arg.record = rec_on_trk;
2561
2562 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2563 &pfxdata, sizeof(pfxdata), total_data_size);
2564 return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2565 }
2566
2567 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2568 struct dasd_device *startdev,
2569 struct dasd_block *block,
2570 struct request *req,
2571 sector_t first_rec,
2572 sector_t last_rec,
2573 sector_t first_trk,
2574 sector_t last_trk,
2575 unsigned int first_offs,
2576 unsigned int last_offs,
2577 unsigned int blk_per_trk,
2578 unsigned int blksize)
2579 {
2580 struct dasd_ccw_req *cqr;
2581 struct req_iterator iter;
2582 struct bio_vec *bv;
2583 char *dst;
2584 unsigned int trkcount, ctidaw;
2585 unsigned char cmd;
2586 struct dasd_device *basedev;
2587 unsigned int tlf;
2588 struct itcw *itcw;
2589 struct tidaw *last_tidaw = NULL;
2590 int itcw_op;
2591 size_t itcw_size;
2592 u8 tidaw_flags;
2593 unsigned int seg_len, part_len, len_to_track_end;
2594 unsigned char new_track;
2595 sector_t recid, trkid;
2596 unsigned int offs;
2597 unsigned int count, count_to_trk_end;
2598
2599 basedev = block->base;
2600 if (rq_data_dir(req) == READ) {
2601 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2602 itcw_op = ITCW_OP_READ;
2603 } else if (rq_data_dir(req) == WRITE) {
2604 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2605 itcw_op = ITCW_OP_WRITE;
2606 } else
2607 return ERR_PTR(-EINVAL);
2608
2609 /* trackbased I/O needs address all memory via TIDAWs,
2610 * not just for 64 bit addresses. This allows us to map
2611 * each segment directly to one tidaw.
2612 * In the case of write requests, additional tidaws may
2613 * be needed when a segment crosses a track boundary.
2614 */
2615 trkcount = last_trk - first_trk + 1;
2616 ctidaw = 0;
2617 rq_for_each_segment(bv, req, iter) {
2618 ++ctidaw;
2619 }
2620 if (rq_data_dir(req) == WRITE)
2621 ctidaw += (last_trk - first_trk);
2622
2623 /* Allocate the ccw request. */
2624 itcw_size = itcw_calc_size(0, ctidaw, 0);
2625 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2626 if (IS_ERR(cqr))
2627 return cqr;
2628
2629 /* transfer length factor: how many bytes to read from the last track */
2630 if (first_trk == last_trk)
2631 tlf = last_offs - first_offs + 1;
2632 else
2633 tlf = last_offs + 1;
2634 tlf *= blksize;
2635
2636 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2637 if (IS_ERR(itcw)) {
2638 dasd_sfree_request(cqr, startdev);
2639 return ERR_PTR(-EINVAL);
2640 }
2641 cqr->cpaddr = itcw_get_tcw(itcw);
2642 if (prepare_itcw(itcw, first_trk, last_trk,
2643 cmd, basedev, startdev,
2644 first_offs + 1,
2645 trkcount, blksize,
2646 (last_rec - first_rec + 1) * blksize,
2647 tlf, blk_per_trk) == -EAGAIN) {
2648 /* Clock not in sync and XRC is enabled.
2649 * Try again later.
2650 */
2651 dasd_sfree_request(cqr, startdev);
2652 return ERR_PTR(-EAGAIN);
2653 }
2654 len_to_track_end = 0;
2655 /*
2656 * A tidaw can address 4k of memory, but must not cross page boundaries
2657 * We can let the block layer handle this by setting
2658 * blk_queue_segment_boundary to page boundaries and
2659 * blk_max_segment_size to page size when setting up the request queue.
2660 * For write requests, a TIDAW must not cross track boundaries, because
2661 * we have to set the CBC flag on the last tidaw for each track.
2662 */
2663 if (rq_data_dir(req) == WRITE) {
2664 new_track = 1;
2665 recid = first_rec;
2666 rq_for_each_segment(bv, req, iter) {
2667 dst = page_address(bv->bv_page) + bv->bv_offset;
2668 seg_len = bv->bv_len;
2669 while (seg_len) {
2670 if (new_track) {
2671 trkid = recid;
2672 offs = sector_div(trkid, blk_per_trk);
2673 count_to_trk_end = blk_per_trk - offs;
2674 count = min((last_rec - recid + 1),
2675 (sector_t)count_to_trk_end);
2676 len_to_track_end = count * blksize;
2677 recid += count;
2678 new_track = 0;
2679 }
2680 part_len = min(seg_len, len_to_track_end);
2681 seg_len -= part_len;
2682 len_to_track_end -= part_len;
2683 /* We need to end the tidaw at track end */
2684 if (!len_to_track_end) {
2685 new_track = 1;
2686 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2687 } else
2688 tidaw_flags = 0;
2689 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2690 dst, part_len);
2691 if (IS_ERR(last_tidaw))
2692 return ERR_PTR(-EINVAL);
2693 dst += part_len;
2694 }
2695 }
2696 } else {
2697 rq_for_each_segment(bv, req, iter) {
2698 dst = page_address(bv->bv_page) + bv->bv_offset;
2699 last_tidaw = itcw_add_tidaw(itcw, 0x00,
2700 dst, bv->bv_len);
2701 if (IS_ERR(last_tidaw))
2702 return ERR_PTR(-EINVAL);
2703 }
2704 }
2705 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2706 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2707 itcw_finalize(itcw);
2708
2709 if (blk_noretry_request(req) ||
2710 block->base->features & DASD_FEATURE_FAILFAST)
2711 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2712 cqr->cpmode = 1;
2713 cqr->startdev = startdev;
2714 cqr->memdev = startdev;
2715 cqr->block = block;
2716 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2717 cqr->lpm = startdev->path_data.ppm;
2718 cqr->retries = 256;
2719 cqr->buildclk = get_clock();
2720 cqr->status = DASD_CQR_FILLED;
2721 return cqr;
2722 }
2723
2724 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2725 struct dasd_block *block,
2726 struct request *req)
2727 {
2728 int cmdrtd, cmdwtd;
2729 int use_prefix;
2730 int fcx_multitrack;
2731 struct dasd_eckd_private *private;
2732 struct dasd_device *basedev;
2733 sector_t first_rec, last_rec;
2734 sector_t first_trk, last_trk;
2735 unsigned int first_offs, last_offs;
2736 unsigned int blk_per_trk, blksize;
2737 int cdlspecial;
2738 unsigned int data_size;
2739 struct dasd_ccw_req *cqr;
2740
2741 basedev = block->base;
2742 private = (struct dasd_eckd_private *) basedev->private;
2743
2744 /* Calculate number of blocks/records per track. */
2745 blksize = block->bp_block;
2746 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2747 if (blk_per_trk == 0)
2748 return ERR_PTR(-EINVAL);
2749 /* Calculate record id of first and last block. */
2750 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2751 first_offs = sector_div(first_trk, blk_per_trk);
2752 last_rec = last_trk =
2753 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2754 last_offs = sector_div(last_trk, blk_per_trk);
2755 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2756
2757 fcx_multitrack = private->features.feature[40] & 0x20;
2758 data_size = blk_rq_bytes(req);
2759 /* tpm write request add CBC data on each track boundary */
2760 if (rq_data_dir(req) == WRITE)
2761 data_size += (last_trk - first_trk) * 4;
2762
2763 /* is read track data and write track data in command mode supported? */
2764 cmdrtd = private->features.feature[9] & 0x20;
2765 cmdwtd = private->features.feature[12] & 0x40;
2766 use_prefix = private->features.feature[8] & 0x01;
2767
2768 cqr = NULL;
2769 if (cdlspecial || dasd_page_cache) {
2770 /* do nothing, just fall through to the cmd mode single case */
2771 } else if ((data_size <= private->fcx_max_data)
2772 && (fcx_multitrack || (first_trk == last_trk))) {
2773 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2774 first_rec, last_rec,
2775 first_trk, last_trk,
2776 first_offs, last_offs,
2777 blk_per_trk, blksize);
2778 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2779 (PTR_ERR(cqr) != -ENOMEM))
2780 cqr = NULL;
2781 } else if (use_prefix &&
2782 (((rq_data_dir(req) == READ) && cmdrtd) ||
2783 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2784 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2785 first_rec, last_rec,
2786 first_trk, last_trk,
2787 first_offs, last_offs,
2788 blk_per_trk, blksize);
2789 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2790 (PTR_ERR(cqr) != -ENOMEM))
2791 cqr = NULL;
2792 }
2793 if (!cqr)
2794 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2795 first_rec, last_rec,
2796 first_trk, last_trk,
2797 first_offs, last_offs,
2798 blk_per_trk, blksize);
2799 return cqr;
2800 }
2801
2802 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
2803 struct dasd_block *block,
2804 struct request *req)
2805 {
2806 unsigned long *idaws;
2807 struct dasd_device *basedev;
2808 struct dasd_ccw_req *cqr;
2809 struct ccw1 *ccw;
2810 struct req_iterator iter;
2811 struct bio_vec *bv;
2812 char *dst;
2813 unsigned char cmd;
2814 unsigned int trkcount;
2815 unsigned int seg_len, len_to_track_end;
2816 unsigned int first_offs;
2817 unsigned int cidaw, cplength, datasize;
2818 sector_t first_trk, last_trk;
2819 unsigned int pfx_datasize;
2820
2821 /*
2822 * raw track access needs to be mutiple of 64k and on 64k boundary
2823 */
2824 if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
2825 cqr = ERR_PTR(-EINVAL);
2826 goto out;
2827 }
2828 if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
2829 DASD_RAW_SECTORS_PER_TRACK) != 0) {
2830 cqr = ERR_PTR(-EINVAL);
2831 goto out;
2832 }
2833
2834 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
2835 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
2836 DASD_RAW_SECTORS_PER_TRACK;
2837 trkcount = last_trk - first_trk + 1;
2838 first_offs = 0;
2839 basedev = block->base;
2840
2841 if (rq_data_dir(req) == READ)
2842 cmd = DASD_ECKD_CCW_READ_TRACK;
2843 else if (rq_data_dir(req) == WRITE)
2844 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
2845 else {
2846 cqr = ERR_PTR(-EINVAL);
2847 goto out;
2848 }
2849
2850 /*
2851 * Raw track based I/O needs IDAWs for each page,
2852 * and not just for 64 bit addresses.
2853 */
2854 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
2855
2856 /* 1x prefix + one read/write ccw per track */
2857 cplength = 1 + trkcount;
2858
2859 /*
2860 * struct PFX_eckd_data has up to 2 byte as extended parameter
2861 * this is needed for write full track and has to be mentioned
2862 * separately
2863 * add 8 instead of 2 to keep 8 byte boundary
2864 */
2865 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
2866
2867 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
2868
2869 /* Allocate the ccw request. */
2870 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2871 datasize, startdev);
2872 if (IS_ERR(cqr))
2873 goto out;
2874 ccw = cqr->cpaddr;
2875
2876 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
2877 basedev, startdev, 1 /* format */, first_offs + 1,
2878 trkcount, 0, 0) == -EAGAIN) {
2879 /* Clock not in sync and XRC is enabled.
2880 * Try again later.
2881 */
2882 dasd_sfree_request(cqr, startdev);
2883 cqr = ERR_PTR(-EAGAIN);
2884 goto out;
2885 }
2886
2887 idaws = (unsigned long *)(cqr->data + pfx_datasize);
2888
2889 len_to_track_end = 0;
2890
2891 rq_for_each_segment(bv, req, iter) {
2892 dst = page_address(bv->bv_page) + bv->bv_offset;
2893 seg_len = bv->bv_len;
2894 if (!len_to_track_end) {
2895 ccw[-1].flags |= CCW_FLAG_CC;
2896 ccw->cmd_code = cmd;
2897 /* maximum 3390 track size */
2898 ccw->count = 57326;
2899 /* 64k map to one track */
2900 len_to_track_end = 65536;
2901 ccw->cda = (__u32)(addr_t)idaws;
2902 ccw->flags |= CCW_FLAG_IDA;
2903 ccw->flags |= CCW_FLAG_SLI;
2904 ccw++;
2905 }
2906 len_to_track_end -= seg_len;
2907 idaws = idal_create_words(idaws, dst, seg_len);
2908 }
2909
2910 if (blk_noretry_request(req) ||
2911 block->base->features & DASD_FEATURE_FAILFAST)
2912 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2913 cqr->startdev = startdev;
2914 cqr->memdev = startdev;
2915 cqr->block = block;
2916 cqr->expires = startdev->default_expires * HZ;
2917 cqr->lpm = startdev->path_data.ppm;
2918 cqr->retries = 256;
2919 cqr->buildclk = get_clock();
2920 cqr->status = DASD_CQR_FILLED;
2921
2922 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2923 cqr = NULL;
2924 out:
2925 return cqr;
2926 }
2927
2928
2929 static int
2930 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2931 {
2932 struct dasd_eckd_private *private;
2933 struct ccw1 *ccw;
2934 struct req_iterator iter;
2935 struct bio_vec *bv;
2936 char *dst, *cda;
2937 unsigned int blksize, blk_per_trk, off;
2938 sector_t recid;
2939 int status;
2940
2941 if (!dasd_page_cache)
2942 goto out;
2943 private = (struct dasd_eckd_private *) cqr->block->base->private;
2944 blksize = cqr->block->bp_block;
2945 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2946 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2947 ccw = cqr->cpaddr;
2948 /* Skip over define extent & locate record. */
2949 ccw++;
2950 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2951 ccw++;
2952 rq_for_each_segment(bv, req, iter) {
2953 dst = page_address(bv->bv_page) + bv->bv_offset;
2954 for (off = 0; off < bv->bv_len; off += blksize) {
2955 /* Skip locate record. */
2956 if (private->uses_cdl && recid <= 2*blk_per_trk)
2957 ccw++;
2958 if (dst) {
2959 if (ccw->flags & CCW_FLAG_IDA)
2960 cda = *((char **)((addr_t) ccw->cda));
2961 else
2962 cda = (char *)((addr_t) ccw->cda);
2963 if (dst != cda) {
2964 if (rq_data_dir(req) == READ)
2965 memcpy(dst, cda, bv->bv_len);
2966 kmem_cache_free(dasd_page_cache,
2967 (void *)((addr_t)cda & PAGE_MASK));
2968 }
2969 dst = NULL;
2970 }
2971 ccw++;
2972 recid++;
2973 }
2974 }
2975 out:
2976 status = cqr->status == DASD_CQR_DONE;
2977 dasd_sfree_request(cqr, cqr->memdev);
2978 return status;
2979 }
2980
2981 /*
2982 * Modify ccw/tcw in cqr so it can be started on a base device.
2983 *
2984 * Note that this is not enough to restart the cqr!
2985 * Either reset cqr->startdev as well (summary unit check handling)
2986 * or restart via separate cqr (as in ERP handling).
2987 */
2988 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2989 {
2990 struct ccw1 *ccw;
2991 struct PFX_eckd_data *pfxdata;
2992 struct tcw *tcw;
2993 struct tccb *tccb;
2994 struct dcw *dcw;
2995
2996 if (cqr->cpmode == 1) {
2997 tcw = cqr->cpaddr;
2998 tccb = tcw_get_tccb(tcw);
2999 dcw = (struct dcw *)&tccb->tca[0];
3000 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3001 pfxdata->validity.verify_base = 0;
3002 pfxdata->validity.hyper_pav = 0;
3003 } else {
3004 ccw = cqr->cpaddr;
3005 pfxdata = cqr->data;
3006 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3007 pfxdata->validity.verify_base = 0;
3008 pfxdata->validity.hyper_pav = 0;
3009 }
3010 }
3011 }
3012
3013 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3014
3015 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3016 struct dasd_block *block,
3017 struct request *req)
3018 {
3019 struct dasd_eckd_private *private;
3020 struct dasd_device *startdev;
3021 unsigned long flags;
3022 struct dasd_ccw_req *cqr;
3023
3024 startdev = dasd_alias_get_start_dev(base);
3025 if (!startdev)
3026 startdev = base;
3027 private = (struct dasd_eckd_private *) startdev->private;
3028 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3029 return ERR_PTR(-EBUSY);
3030
3031 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3032 private->count++;
3033 if ((base->features & DASD_FEATURE_USERAW))
3034 cqr = dasd_raw_build_cp(startdev, block, req);
3035 else
3036 cqr = dasd_eckd_build_cp(startdev, block, req);
3037 if (IS_ERR(cqr))
3038 private->count--;
3039 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3040 return cqr;
3041 }
3042
3043 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3044 struct request *req)
3045 {
3046 struct dasd_eckd_private *private;
3047 unsigned long flags;
3048
3049 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3050 private = (struct dasd_eckd_private *) cqr->memdev->private;
3051 private->count--;
3052 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3053 return dasd_eckd_free_cp(cqr, req);
3054 }
3055
3056 static int
3057 dasd_eckd_fill_info(struct dasd_device * device,
3058 struct dasd_information2_t * info)
3059 {
3060 struct dasd_eckd_private *private;
3061
3062 private = (struct dasd_eckd_private *) device->private;
3063 info->label_block = 2;
3064 info->FBA_layout = private->uses_cdl ? 0 : 1;
3065 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3066 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3067 memcpy(info->characteristics, &private->rdc_data,
3068 sizeof(struct dasd_eckd_characteristics));
3069 info->confdata_size = min((unsigned long)private->conf_len,
3070 sizeof(info->configuration_data));
3071 memcpy(info->configuration_data, private->conf_data,
3072 info->confdata_size);
3073 return 0;
3074 }
3075
3076 /*
3077 * SECTION: ioctl functions for eckd devices.
3078 */
3079
3080 /*
3081 * Release device ioctl.
3082 * Buils a channel programm to releases a prior reserved
3083 * (see dasd_eckd_reserve) device.
3084 */
3085 static int
3086 dasd_eckd_release(struct dasd_device *device)
3087 {
3088 struct dasd_ccw_req *cqr;
3089 int rc;
3090 struct ccw1 *ccw;
3091 int useglobal;
3092
3093 if (!capable(CAP_SYS_ADMIN))
3094 return -EACCES;
3095
3096 useglobal = 0;
3097 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3098 if (IS_ERR(cqr)) {
3099 mutex_lock(&dasd_reserve_mutex);
3100 useglobal = 1;
3101 cqr = &dasd_reserve_req->cqr;
3102 memset(cqr, 0, sizeof(*cqr));
3103 memset(&dasd_reserve_req->ccw, 0,
3104 sizeof(dasd_reserve_req->ccw));
3105 cqr->cpaddr = &dasd_reserve_req->ccw;
3106 cqr->data = &dasd_reserve_req->data;
3107 cqr->magic = DASD_ECKD_MAGIC;
3108 }
3109 ccw = cqr->cpaddr;
3110 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3111 ccw->flags |= CCW_FLAG_SLI;
3112 ccw->count = 32;
3113 ccw->cda = (__u32)(addr_t) cqr->data;
3114 cqr->startdev = device;
3115 cqr->memdev = device;
3116 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3117 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3118 cqr->retries = 2; /* set retry counter to enable basic ERP */
3119 cqr->expires = 2 * HZ;
3120 cqr->buildclk = get_clock();
3121 cqr->status = DASD_CQR_FILLED;
3122
3123 rc = dasd_sleep_on_immediatly(cqr);
3124 if (!rc)
3125 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3126
3127 if (useglobal)
3128 mutex_unlock(&dasd_reserve_mutex);
3129 else
3130 dasd_sfree_request(cqr, cqr->memdev);
3131 return rc;
3132 }
3133
3134 /*
3135 * Reserve device ioctl.
3136 * Options are set to 'synchronous wait for interrupt' and
3137 * 'timeout the request'. This leads to a terminate IO if
3138 * the interrupt is outstanding for a certain time.
3139 */
3140 static int
3141 dasd_eckd_reserve(struct dasd_device *device)
3142 {
3143 struct dasd_ccw_req *cqr;
3144 int rc;
3145 struct ccw1 *ccw;
3146 int useglobal;
3147
3148 if (!capable(CAP_SYS_ADMIN))
3149 return -EACCES;
3150
3151 useglobal = 0;
3152 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3153 if (IS_ERR(cqr)) {
3154 mutex_lock(&dasd_reserve_mutex);
3155 useglobal = 1;
3156 cqr = &dasd_reserve_req->cqr;
3157 memset(cqr, 0, sizeof(*cqr));
3158 memset(&dasd_reserve_req->ccw, 0,
3159 sizeof(dasd_reserve_req->ccw));
3160 cqr->cpaddr = &dasd_reserve_req->ccw;
3161 cqr->data = &dasd_reserve_req->data;
3162 cqr->magic = DASD_ECKD_MAGIC;
3163 }
3164 ccw = cqr->cpaddr;
3165 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3166 ccw->flags |= CCW_FLAG_SLI;
3167 ccw->count = 32;
3168 ccw->cda = (__u32)(addr_t) cqr->data;
3169 cqr->startdev = device;
3170 cqr->memdev = device;
3171 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3172 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3173 cqr->retries = 2; /* set retry counter to enable basic ERP */
3174 cqr->expires = 2 * HZ;
3175 cqr->buildclk = get_clock();
3176 cqr->status = DASD_CQR_FILLED;
3177
3178 rc = dasd_sleep_on_immediatly(cqr);
3179 if (!rc)
3180 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3181
3182 if (useglobal)
3183 mutex_unlock(&dasd_reserve_mutex);
3184 else
3185 dasd_sfree_request(cqr, cqr->memdev);
3186 return rc;
3187 }
3188
3189 /*
3190 * Steal lock ioctl - unconditional reserve device.
3191 * Buils a channel programm to break a device's reservation.
3192 * (unconditional reserve)
3193 */
3194 static int
3195 dasd_eckd_steal_lock(struct dasd_device *device)
3196 {
3197 struct dasd_ccw_req *cqr;
3198 int rc;
3199 struct ccw1 *ccw;
3200 int useglobal;
3201
3202 if (!capable(CAP_SYS_ADMIN))
3203 return -EACCES;
3204
3205 useglobal = 0;
3206 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3207 if (IS_ERR(cqr)) {
3208 mutex_lock(&dasd_reserve_mutex);
3209 useglobal = 1;
3210 cqr = &dasd_reserve_req->cqr;
3211 memset(cqr, 0, sizeof(*cqr));
3212 memset(&dasd_reserve_req->ccw, 0,
3213 sizeof(dasd_reserve_req->ccw));
3214 cqr->cpaddr = &dasd_reserve_req->ccw;
3215 cqr->data = &dasd_reserve_req->data;
3216 cqr->magic = DASD_ECKD_MAGIC;
3217 }
3218 ccw = cqr->cpaddr;
3219 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3220 ccw->flags |= CCW_FLAG_SLI;
3221 ccw->count = 32;
3222 ccw->cda = (__u32)(addr_t) cqr->data;
3223 cqr->startdev = device;
3224 cqr->memdev = device;
3225 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3226 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3227 cqr->retries = 2; /* set retry counter to enable basic ERP */
3228 cqr->expires = 2 * HZ;
3229 cqr->buildclk = get_clock();
3230 cqr->status = DASD_CQR_FILLED;
3231
3232 rc = dasd_sleep_on_immediatly(cqr);
3233 if (!rc)
3234 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3235
3236 if (useglobal)
3237 mutex_unlock(&dasd_reserve_mutex);
3238 else
3239 dasd_sfree_request(cqr, cqr->memdev);
3240 return rc;
3241 }
3242
3243 /*
3244 * SNID - Sense Path Group ID
3245 * This ioctl may be used in situations where I/O is stalled due to
3246 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3247 * preallocated dasd_reserve_req.
3248 */
3249 static int dasd_eckd_snid(struct dasd_device *device,
3250 void __user *argp)
3251 {
3252 struct dasd_ccw_req *cqr;
3253 int rc;
3254 struct ccw1 *ccw;
3255 int useglobal;
3256 struct dasd_snid_ioctl_data usrparm;
3257
3258 if (!capable(CAP_SYS_ADMIN))
3259 return -EACCES;
3260
3261 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3262 return -EFAULT;
3263
3264 useglobal = 0;
3265 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3266 sizeof(struct dasd_snid_data), device);
3267 if (IS_ERR(cqr)) {
3268 mutex_lock(&dasd_reserve_mutex);
3269 useglobal = 1;
3270 cqr = &dasd_reserve_req->cqr;
3271 memset(cqr, 0, sizeof(*cqr));
3272 memset(&dasd_reserve_req->ccw, 0,
3273 sizeof(dasd_reserve_req->ccw));
3274 cqr->cpaddr = &dasd_reserve_req->ccw;
3275 cqr->data = &dasd_reserve_req->data;
3276 cqr->magic = DASD_ECKD_MAGIC;
3277 }
3278 ccw = cqr->cpaddr;
3279 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3280 ccw->flags |= CCW_FLAG_SLI;
3281 ccw->count = 12;
3282 ccw->cda = (__u32)(addr_t) cqr->data;
3283 cqr->startdev = device;
3284 cqr->memdev = device;
3285 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3286 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3287 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3288 cqr->retries = 5;
3289 cqr->expires = 10 * HZ;
3290 cqr->buildclk = get_clock();
3291 cqr->status = DASD_CQR_FILLED;
3292 cqr->lpm = usrparm.path_mask;
3293
3294 rc = dasd_sleep_on_immediatly(cqr);
3295 /* verify that I/O processing didn't modify the path mask */
3296 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3297 rc = -EIO;
3298 if (!rc) {
3299 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3300 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3301 rc = -EFAULT;
3302 }
3303
3304 if (useglobal)
3305 mutex_unlock(&dasd_reserve_mutex);
3306 else
3307 dasd_sfree_request(cqr, cqr->memdev);
3308 return rc;
3309 }
3310
3311 /*
3312 * Read performance statistics
3313 */
3314 static int
3315 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3316 {
3317 struct dasd_psf_prssd_data *prssdp;
3318 struct dasd_rssd_perf_stats_t *stats;
3319 struct dasd_ccw_req *cqr;
3320 struct ccw1 *ccw;
3321 int rc;
3322
3323 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3324 (sizeof(struct dasd_psf_prssd_data) +
3325 sizeof(struct dasd_rssd_perf_stats_t)),
3326 device);
3327 if (IS_ERR(cqr)) {
3328 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3329 "Could not allocate initialization request");
3330 return PTR_ERR(cqr);
3331 }
3332 cqr->startdev = device;
3333 cqr->memdev = device;
3334 cqr->retries = 0;
3335 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3336 cqr->expires = 10 * HZ;
3337
3338 /* Prepare for Read Subsystem Data */
3339 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3340 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3341 prssdp->order = PSF_ORDER_PRSSD;
3342 prssdp->suborder = 0x01; /* Performance Statistics */
3343 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3344
3345 ccw = cqr->cpaddr;
3346 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3347 ccw->count = sizeof(struct dasd_psf_prssd_data);
3348 ccw->flags |= CCW_FLAG_CC;
3349 ccw->cda = (__u32)(addr_t) prssdp;
3350
3351 /* Read Subsystem Data - Performance Statistics */
3352 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3353 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3354
3355 ccw++;
3356 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3357 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3358 ccw->cda = (__u32)(addr_t) stats;
3359
3360 cqr->buildclk = get_clock();
3361 cqr->status = DASD_CQR_FILLED;
3362 rc = dasd_sleep_on(cqr);
3363 if (rc == 0) {
3364 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3365 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3366 if (copy_to_user(argp, stats,
3367 sizeof(struct dasd_rssd_perf_stats_t)))
3368 rc = -EFAULT;
3369 }
3370 dasd_sfree_request(cqr, cqr->memdev);
3371 return rc;
3372 }
3373
3374 /*
3375 * Get attributes (cache operations)
3376 * Returnes the cache attributes used in Define Extend (DE).
3377 */
3378 static int
3379 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3380 {
3381 struct dasd_eckd_private *private =
3382 (struct dasd_eckd_private *)device->private;
3383 struct attrib_data_t attrib = private->attrib;
3384 int rc;
3385
3386 if (!capable(CAP_SYS_ADMIN))
3387 return -EACCES;
3388 if (!argp)
3389 return -EINVAL;
3390
3391 rc = 0;
3392 if (copy_to_user(argp, (long *) &attrib,
3393 sizeof(struct attrib_data_t)))
3394 rc = -EFAULT;
3395
3396 return rc;
3397 }
3398
3399 /*
3400 * Set attributes (cache operations)
3401 * Stores the attributes for cache operation to be used in Define Extend (DE).
3402 */
3403 static int
3404 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3405 {
3406 struct dasd_eckd_private *private =
3407 (struct dasd_eckd_private *)device->private;
3408 struct attrib_data_t attrib;
3409
3410 if (!capable(CAP_SYS_ADMIN))
3411 return -EACCES;
3412 if (!argp)
3413 return -EINVAL;
3414
3415 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3416 return -EFAULT;
3417 private->attrib = attrib;
3418
3419 dev_info(&device->cdev->dev,
3420 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3421 private->attrib.operation, private->attrib.nr_cyl);
3422 return 0;
3423 }
3424
3425 /*
3426 * Issue syscall I/O to EMC Symmetrix array.
3427 * CCWs are PSF and RSSD
3428 */
3429 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3430 {
3431 struct dasd_symmio_parms usrparm;
3432 char *psf_data, *rssd_result;
3433 struct dasd_ccw_req *cqr;
3434 struct ccw1 *ccw;
3435 char psf0, psf1;
3436 int rc;
3437
3438 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3439 return -EACCES;
3440 psf0 = psf1 = 0;
3441
3442 /* Copy parms from caller */
3443 rc = -EFAULT;
3444 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3445 goto out;
3446 if (is_compat_task() || sizeof(long) == 4) {
3447 /* Make sure pointers are sane even on 31 bit. */
3448 rc = -EINVAL;
3449 if ((usrparm.psf_data >> 32) != 0)
3450 goto out;
3451 if ((usrparm.rssd_result >> 32) != 0)
3452 goto out;
3453 usrparm.psf_data &= 0x7fffffffULL;
3454 usrparm.rssd_result &= 0x7fffffffULL;
3455 }
3456 /* alloc I/O data area */
3457 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3458 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3459 if (!psf_data || !rssd_result) {
3460 rc = -ENOMEM;
3461 goto out_free;
3462 }
3463
3464 /* get syscall header from user space */
3465 rc = -EFAULT;
3466 if (copy_from_user(psf_data,
3467 (void __user *)(unsigned long) usrparm.psf_data,
3468 usrparm.psf_data_len))
3469 goto out_free;
3470 psf0 = psf_data[0];
3471 psf1 = psf_data[1];
3472
3473 /* setup CCWs for PSF + RSSD */
3474 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3475 if (IS_ERR(cqr)) {
3476 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3477 "Could not allocate initialization request");
3478 rc = PTR_ERR(cqr);
3479 goto out_free;
3480 }
3481
3482 cqr->startdev = device;
3483 cqr->memdev = device;
3484 cqr->retries = 3;
3485 cqr->expires = 10 * HZ;
3486 cqr->buildclk = get_clock();
3487 cqr->status = DASD_CQR_FILLED;
3488
3489 /* Build the ccws */
3490 ccw = cqr->cpaddr;
3491
3492 /* PSF ccw */
3493 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3494 ccw->count = usrparm.psf_data_len;
3495 ccw->flags |= CCW_FLAG_CC;
3496 ccw->cda = (__u32)(addr_t) psf_data;
3497
3498 ccw++;
3499
3500 /* RSSD ccw */
3501 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3502 ccw->count = usrparm.rssd_result_len;
3503 ccw->flags = CCW_FLAG_SLI ;
3504 ccw->cda = (__u32)(addr_t) rssd_result;
3505
3506 rc = dasd_sleep_on(cqr);
3507 if (rc)
3508 goto out_sfree;
3509
3510 rc = -EFAULT;
3511 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3512 rssd_result, usrparm.rssd_result_len))
3513 goto out_sfree;
3514 rc = 0;
3515
3516 out_sfree:
3517 dasd_sfree_request(cqr, cqr->memdev);
3518 out_free:
3519 kfree(rssd_result);
3520 kfree(psf_data);
3521 out:
3522 DBF_DEV_EVENT(DBF_WARNING, device,
3523 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3524 (int) psf0, (int) psf1, rc);
3525 return rc;
3526 }
3527
3528 static int
3529 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3530 {
3531 struct dasd_device *device = block->base;
3532
3533 switch (cmd) {
3534 case BIODASDGATTR:
3535 return dasd_eckd_get_attrib(device, argp);
3536 case BIODASDSATTR:
3537 return dasd_eckd_set_attrib(device, argp);
3538 case BIODASDPSRD:
3539 return dasd_eckd_performance(device, argp);
3540 case BIODASDRLSE:
3541 return dasd_eckd_release(device);
3542 case BIODASDRSRV:
3543 return dasd_eckd_reserve(device);
3544 case BIODASDSLCK:
3545 return dasd_eckd_steal_lock(device);
3546 case BIODASDSNID:
3547 return dasd_eckd_snid(device, argp);
3548 case BIODASDSYMMIO:
3549 return dasd_symm_io(device, argp);
3550 default:
3551 return -ENOIOCTLCMD;
3552 }
3553 }
3554
3555 /*
3556 * Dump the range of CCWs into 'page' buffer
3557 * and return number of printed chars.
3558 */
3559 static int
3560 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3561 {
3562 int len, count;
3563 char *datap;
3564
3565 len = 0;
3566 while (from <= to) {
3567 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3568 " CCW %p: %08X %08X DAT:",
3569 from, ((int *) from)[0], ((int *) from)[1]);
3570
3571 /* get pointer to data (consider IDALs) */
3572 if (from->flags & CCW_FLAG_IDA)
3573 datap = (char *) *((addr_t *) (addr_t) from->cda);
3574 else
3575 datap = (char *) ((addr_t) from->cda);
3576
3577 /* dump data (max 32 bytes) */
3578 for (count = 0; count < from->count && count < 32; count++) {
3579 if (count % 8 == 0) len += sprintf(page + len, " ");
3580 if (count % 4 == 0) len += sprintf(page + len, " ");
3581 len += sprintf(page + len, "%02x", datap[count]);
3582 }
3583 len += sprintf(page + len, "\n");
3584 from++;
3585 }
3586 return len;
3587 }
3588
3589 static void
3590 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3591 char *reason)
3592 {
3593 u64 *sense;
3594 u64 *stat;
3595
3596 sense = (u64 *) dasd_get_sense(irb);
3597 stat = (u64 *) &irb->scsw;
3598 if (sense) {
3599 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3600 "%016llx %016llx %016llx %016llx",
3601 reason, *stat, *((u32 *) (stat + 1)),
3602 sense[0], sense[1], sense[2], sense[3]);
3603 } else {
3604 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3605 reason, *stat, *((u32 *) (stat + 1)),
3606 "NO VALID SENSE");
3607 }
3608 }
3609
3610 /*
3611 * Print sense data and related channel program.
3612 * Parts are printed because printk buffer is only 1024 bytes.
3613 */
3614 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3615 struct dasd_ccw_req *req, struct irb *irb)
3616 {
3617 char *page;
3618 struct ccw1 *first, *last, *fail, *from, *to;
3619 int len, sl, sct;
3620
3621 page = (char *) get_zeroed_page(GFP_ATOMIC);
3622 if (page == NULL) {
3623 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3624 "No memory to dump sense data\n");
3625 return;
3626 }
3627 /* dump the sense data */
3628 len = sprintf(page, KERN_ERR PRINTK_HEADER
3629 " I/O status report for device %s:\n",
3630 dev_name(&device->cdev->dev));
3631 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3632 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3633 "CS:%02X RC:%d\n",
3634 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3635 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3636 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3637 req ? req->intrc : 0);
3638 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3639 " device %s: Failing CCW: %p\n",
3640 dev_name(&device->cdev->dev),
3641 (void *) (addr_t) irb->scsw.cmd.cpa);
3642 if (irb->esw.esw0.erw.cons) {
3643 for (sl = 0; sl < 4; sl++) {
3644 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3645 " Sense(hex) %2d-%2d:",
3646 (8 * sl), ((8 * sl) + 7));
3647
3648 for (sct = 0; sct < 8; sct++) {
3649 len += sprintf(page + len, " %02x",
3650 irb->ecw[8 * sl + sct]);
3651 }
3652 len += sprintf(page + len, "\n");
3653 }
3654
3655 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3656 /* 24 Byte Sense Data */
3657 sprintf(page + len, KERN_ERR PRINTK_HEADER
3658 " 24 Byte: %x MSG %x, "
3659 "%s MSGb to SYSOP\n",
3660 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3661 irb->ecw[1] & 0x10 ? "" : "no");
3662 } else {
3663 /* 32 Byte Sense Data */
3664 sprintf(page + len, KERN_ERR PRINTK_HEADER
3665 " 32 Byte: Format: %x "
3666 "Exception class %x\n",
3667 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3668 }
3669 } else {
3670 sprintf(page + len, KERN_ERR PRINTK_HEADER
3671 " SORRY - NO VALID SENSE AVAILABLE\n");
3672 }
3673 printk("%s", page);
3674
3675 if (req) {
3676 /* req == NULL for unsolicited interrupts */
3677 /* dump the Channel Program (max 140 Bytes per line) */
3678 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3679 first = req->cpaddr;
3680 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3681 to = min(first + 6, last);
3682 len = sprintf(page, KERN_ERR PRINTK_HEADER
3683 " Related CP in req: %p\n", req);
3684 dasd_eckd_dump_ccw_range(first, to, page + len);
3685 printk("%s", page);
3686
3687 /* print failing CCW area (maximum 4) */
3688 /* scsw->cda is either valid or zero */
3689 len = 0;
3690 from = ++to;
3691 fail = (struct ccw1 *)(addr_t)
3692 irb->scsw.cmd.cpa; /* failing CCW */
3693 if (from < fail - 2) {
3694 from = fail - 2; /* there is a gap - print header */
3695 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3696 }
3697 to = min(fail + 1, last);
3698 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3699
3700 /* print last CCWs (maximum 2) */
3701 from = max(from, ++to);
3702 if (from < last - 1) {
3703 from = last - 1; /* there is a gap - print header */
3704 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3705 }
3706 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3707 if (len > 0)
3708 printk("%s", page);
3709 }
3710 free_page((unsigned long) page);
3711 }
3712
3713
3714 /*
3715 * Print sense data from a tcw.
3716 */
3717 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3718 struct dasd_ccw_req *req, struct irb *irb)
3719 {
3720 char *page;
3721 int len, sl, sct, residual;
3722 struct tsb *tsb;
3723 u8 *sense, *rcq;
3724
3725 page = (char *) get_zeroed_page(GFP_ATOMIC);
3726 if (page == NULL) {
3727 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3728 "No memory to dump sense data");
3729 return;
3730 }
3731 /* dump the sense data */
3732 len = sprintf(page, KERN_ERR PRINTK_HEADER
3733 " I/O status report for device %s:\n",
3734 dev_name(&device->cdev->dev));
3735 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3736 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3737 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3738 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3739 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3740 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3741 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3742 req ? req->intrc : 0);
3743 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3744 " device %s: Failing TCW: %p\n",
3745 dev_name(&device->cdev->dev),
3746 (void *) (addr_t) irb->scsw.tm.tcw);
3747
3748 tsb = NULL;
3749 sense = NULL;
3750 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
3751 tsb = tcw_get_tsb(
3752 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3753
3754 if (tsb) {
3755 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3756 " tsb->length %d\n", tsb->length);
3757 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3758 " tsb->flags %x\n", tsb->flags);
3759 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3760 " tsb->dcw_offset %d\n", tsb->dcw_offset);
3761 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3762 " tsb->count %d\n", tsb->count);
3763 residual = tsb->count - 28;
3764 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3765 " residual %d\n", residual);
3766
3767 switch (tsb->flags & 0x07) {
3768 case 1: /* tsa_iostat */
3769 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3770 " tsb->tsa.iostat.dev_time %d\n",
3771 tsb->tsa.iostat.dev_time);
3772 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3773 " tsb->tsa.iostat.def_time %d\n",
3774 tsb->tsa.iostat.def_time);
3775 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3776 " tsb->tsa.iostat.queue_time %d\n",
3777 tsb->tsa.iostat.queue_time);
3778 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3779 " tsb->tsa.iostat.dev_busy_time %d\n",
3780 tsb->tsa.iostat.dev_busy_time);
3781 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3782 " tsb->tsa.iostat.dev_act_time %d\n",
3783 tsb->tsa.iostat.dev_act_time);
3784 sense = tsb->tsa.iostat.sense;
3785 break;
3786 case 2: /* ts_ddpc */
3787 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3788 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3789 for (sl = 0; sl < 2; sl++) {
3790 len += sprintf(page + len,
3791 KERN_ERR PRINTK_HEADER
3792 " tsb->tsa.ddpc.rcq %2d-%2d: ",
3793 (8 * sl), ((8 * sl) + 7));
3794 rcq = tsb->tsa.ddpc.rcq;
3795 for (sct = 0; sct < 8; sct++) {
3796 len += sprintf(page + len, " %02x",
3797 rcq[8 * sl + sct]);
3798 }
3799 len += sprintf(page + len, "\n");
3800 }
3801 sense = tsb->tsa.ddpc.sense;
3802 break;
3803 case 3: /* tsa_intrg */
3804 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3805 " tsb->tsa.intrg.: not supportet yet \n");
3806 break;
3807 }
3808
3809 if (sense) {
3810 for (sl = 0; sl < 4; sl++) {
3811 len += sprintf(page + len,
3812 KERN_ERR PRINTK_HEADER
3813 " Sense(hex) %2d-%2d:",
3814 (8 * sl), ((8 * sl) + 7));
3815 for (sct = 0; sct < 8; sct++) {
3816 len += sprintf(page + len, " %02x",
3817 sense[8 * sl + sct]);
3818 }
3819 len += sprintf(page + len, "\n");
3820 }
3821
3822 if (sense[27] & DASD_SENSE_BIT_0) {
3823 /* 24 Byte Sense Data */
3824 sprintf(page + len, KERN_ERR PRINTK_HEADER
3825 " 24 Byte: %x MSG %x, "
3826 "%s MSGb to SYSOP\n",
3827 sense[7] >> 4, sense[7] & 0x0f,
3828 sense[1] & 0x10 ? "" : "no");
3829 } else {
3830 /* 32 Byte Sense Data */
3831 sprintf(page + len, KERN_ERR PRINTK_HEADER
3832 " 32 Byte: Format: %x "
3833 "Exception class %x\n",
3834 sense[6] & 0x0f, sense[22] >> 4);
3835 }
3836 } else {
3837 sprintf(page + len, KERN_ERR PRINTK_HEADER
3838 " SORRY - NO VALID SENSE AVAILABLE\n");
3839 }
3840 } else {
3841 sprintf(page + len, KERN_ERR PRINTK_HEADER
3842 " SORRY - NO TSB DATA AVAILABLE\n");
3843 }
3844 printk("%s", page);
3845 free_page((unsigned long) page);
3846 }
3847
3848 static void dasd_eckd_dump_sense(struct dasd_device *device,
3849 struct dasd_ccw_req *req, struct irb *irb)
3850 {
3851 if (scsw_is_tm(&irb->scsw))
3852 dasd_eckd_dump_sense_tcw(device, req, irb);
3853 else
3854 dasd_eckd_dump_sense_ccw(device, req, irb);
3855 }
3856
3857 static int dasd_eckd_pm_freeze(struct dasd_device *device)
3858 {
3859 /*
3860 * the device should be disconnected from our LCU structure
3861 * on restore we will reconnect it and reread LCU specific
3862 * information like PAV support that might have changed
3863 */
3864 dasd_alias_remove_device(device);
3865 dasd_alias_disconnect_device_from_lcu(device);
3866
3867 return 0;
3868 }
3869
3870 static int dasd_eckd_restore_device(struct dasd_device *device)
3871 {
3872 struct dasd_eckd_private *private;
3873 struct dasd_eckd_characteristics temp_rdc_data;
3874 int is_known, rc;
3875 struct dasd_uid temp_uid;
3876 unsigned long flags;
3877
3878 private = (struct dasd_eckd_private *) device->private;
3879
3880 /* Read Configuration Data */
3881 rc = dasd_eckd_read_conf(device);
3882 if (rc)
3883 goto out_err;
3884
3885 dasd_eckd_get_uid(device, &temp_uid);
3886 /* Generate device unique id */
3887 rc = dasd_eckd_generate_uid(device);
3888 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3889 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3890 dev_err(&device->cdev->dev, "The UID of the DASD has "
3891 "changed\n");
3892 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3893 if (rc)
3894 goto out_err;
3895
3896 /* register lcu with alias handling, enable PAV if this is a new lcu */
3897 is_known = dasd_alias_make_device_known_to_lcu(device);
3898 if (is_known < 0)
3899 return is_known;
3900 if (!is_known) {
3901 dasd_eckd_validate_server(device);
3902 dasd_alias_lcu_setup_complete(device);
3903 } else
3904 dasd_alias_wait_for_lcu_setup(device);
3905
3906 /* RE-Read Configuration Data */
3907 rc = dasd_eckd_read_conf(device);
3908 if (rc)
3909 goto out_err;
3910
3911 /* Read Feature Codes */
3912 dasd_eckd_read_features(device);
3913
3914 /* Read Device Characteristics */
3915 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3916 &temp_rdc_data, 64);
3917 if (rc) {
3918 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
3919 "Read device characteristic failed, rc=%d", rc);
3920 goto out_err;
3921 }
3922 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3923 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
3924 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3925
3926 /* add device to alias management */
3927 dasd_alias_add_device(device);
3928
3929 return 0;
3930
3931 out_err:
3932 return -1;
3933 }
3934
3935 static int dasd_eckd_reload_device(struct dasd_device *device)
3936 {
3937 struct dasd_eckd_private *private;
3938 int rc, old_base;
3939 char print_uid[60];
3940 struct dasd_uid uid;
3941 unsigned long flags;
3942
3943 private = (struct dasd_eckd_private *) device->private;
3944
3945 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3946 old_base = private->uid.base_unit_addr;
3947 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3948
3949 /* Read Configuration Data */
3950 rc = dasd_eckd_read_conf(device);
3951 if (rc)
3952 goto out_err;
3953
3954 rc = dasd_eckd_generate_uid(device);
3955 if (rc)
3956 goto out_err;
3957 /*
3958 * update unit address configuration and
3959 * add device to alias management
3960 */
3961 dasd_alias_update_add_device(device);
3962
3963 dasd_eckd_get_uid(device, &uid);
3964
3965 if (old_base != uid.base_unit_addr) {
3966 if (strlen(uid.vduit) > 0)
3967 snprintf(print_uid, sizeof(print_uid),
3968 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
3969 uid.ssid, uid.base_unit_addr, uid.vduit);
3970 else
3971 snprintf(print_uid, sizeof(print_uid),
3972 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
3973 uid.ssid, uid.base_unit_addr);
3974
3975 dev_info(&device->cdev->dev,
3976 "An Alias device was reassigned to a new base device "
3977 "with UID: %s\n", print_uid);
3978 }
3979 return 0;
3980
3981 out_err:
3982 return -1;
3983 }
3984
3985 static struct ccw_driver dasd_eckd_driver = {
3986 .driver = {
3987 .name = "dasd-eckd",
3988 .owner = THIS_MODULE,
3989 },
3990 .ids = dasd_eckd_ids,
3991 .probe = dasd_eckd_probe,
3992 .remove = dasd_generic_remove,
3993 .set_offline = dasd_generic_set_offline,
3994 .set_online = dasd_eckd_set_online,
3995 .notify = dasd_generic_notify,
3996 .path_event = dasd_generic_path_event,
3997 .freeze = dasd_generic_pm_freeze,
3998 .thaw = dasd_generic_restore_device,
3999 .restore = dasd_generic_restore_device,
4000 .uc_handler = dasd_generic_uc_handler,
4001 };
4002
4003 /*
4004 * max_blocks is dependent on the amount of storage that is available
4005 * in the static io buffer for each device. Currently each device has
4006 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4007 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4008 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4009 * addition we have one define extent ccw + 16 bytes of data and one
4010 * locate record ccw + 16 bytes of data. That makes:
4011 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4012 * We want to fit two into the available memory so that we can immediately
4013 * start the next request if one finishes off. That makes 249.5 blocks
4014 * for one request. Give a little safety and the result is 240.
4015 */
4016 static struct dasd_discipline dasd_eckd_discipline = {
4017 .owner = THIS_MODULE,
4018 .name = "ECKD",
4019 .ebcname = "ECKD",
4020 .max_blocks = 190,
4021 .check_device = dasd_eckd_check_characteristics,
4022 .uncheck_device = dasd_eckd_uncheck_device,
4023 .do_analysis = dasd_eckd_do_analysis,
4024 .verify_path = dasd_eckd_verify_path,
4025 .ready_to_online = dasd_eckd_ready_to_online,
4026 .online_to_ready = dasd_eckd_online_to_ready,
4027 .fill_geometry = dasd_eckd_fill_geometry,
4028 .start_IO = dasd_start_IO,
4029 .term_IO = dasd_term_IO,
4030 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4031 .format_device = dasd_eckd_format_device,
4032 .erp_action = dasd_eckd_erp_action,
4033 .erp_postaction = dasd_eckd_erp_postaction,
4034 .check_for_device_change = dasd_eckd_check_for_device_change,
4035 .build_cp = dasd_eckd_build_alias_cp,
4036 .free_cp = dasd_eckd_free_alias_cp,
4037 .dump_sense = dasd_eckd_dump_sense,
4038 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4039 .fill_info = dasd_eckd_fill_info,
4040 .ioctl = dasd_eckd_ioctl,
4041 .freeze = dasd_eckd_pm_freeze,
4042 .restore = dasd_eckd_restore_device,
4043 .reload = dasd_eckd_reload_device,
4044 .get_uid = dasd_eckd_get_uid,
4045 };
4046
4047 static int __init
4048 dasd_eckd_init(void)
4049 {
4050 int ret;
4051
4052 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4053 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4054 GFP_KERNEL | GFP_DMA);
4055 if (!dasd_reserve_req)
4056 return -ENOMEM;
4057 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4058 GFP_KERNEL | GFP_DMA);
4059 if (!path_verification_worker) {
4060 kfree(dasd_reserve_req);
4061 return -ENOMEM;
4062 }
4063 ret = ccw_driver_register(&dasd_eckd_driver);
4064 if (!ret)
4065 wait_for_device_probe();
4066 else {
4067 kfree(path_verification_worker);
4068 kfree(dasd_reserve_req);
4069 }
4070 return ret;
4071 }
4072
4073 static void __exit
4074 dasd_eckd_cleanup(void)
4075 {
4076 ccw_driver_unregister(&dasd_eckd_driver);
4077 kfree(path_verification_worker);
4078 kfree(dasd_reserve_req);
4079 }
4080
4081 module_init(dasd_eckd_init);
4082 module_exit(dasd_eckd_cleanup);
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