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Linux 3.4.102
[linux/fpc-iii.git] / drivers / s390 / block / dasd_eckd.c
blobbc2e8a7c265b518e8049bdb1877e0cf57a1b19a2
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/compat.h>
22 #include <linux/init.h>
23
24 #include <asm/debug.h>
25 #include <asm/idals.h>
26 #include <asm/ebcdic.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 /* create unique id from private structure. */
756 static void create_uid(struct dasd_eckd_private *private)
757 {
758 int count;
759 struct dasd_uid *uid;
760
761 uid = &private->uid;
762 memset(uid, 0, sizeof(struct dasd_uid));
763 memcpy(uid->vendor, private->ned->HDA_manufacturer,
764 sizeof(uid->vendor) - 1);
765 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
766 memcpy(uid->serial, private->ned->HDA_location,
767 sizeof(uid->serial) - 1);
768 EBCASC(uid->serial, sizeof(uid->serial) - 1);
769 uid->ssid = private->gneq->subsystemID;
770 uid->real_unit_addr = private->ned->unit_addr;
771 if (private->sneq) {
772 uid->type = private->sneq->sua_flags;
773 if (uid->type == UA_BASE_PAV_ALIAS)
774 uid->base_unit_addr = private->sneq->base_unit_addr;
775 } else {
776 uid->type = UA_BASE_DEVICE;
777 }
778 if (private->vdsneq) {
779 for (count = 0; count < 16; count++) {
780 sprintf(uid->vduit+2*count, "%02x",
781 private->vdsneq->uit[count]);
782 }
783 }
784 }
785
786 /*
787 * Generate device unique id that specifies the physical device.
788 */
789 static int dasd_eckd_generate_uid(struct dasd_device *device)
790 {
791 struct dasd_eckd_private *private;
792 unsigned long flags;
793
794 private = (struct dasd_eckd_private *) device->private;
795 if (!private)
796 return -ENODEV;
797 if (!private->ned || !private->gneq)
798 return -ENODEV;
799 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
800 create_uid(private);
801 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
802 return 0;
803 }
804
805 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
806 {
807 struct dasd_eckd_private *private;
808 unsigned long flags;
809
810 if (device->private) {
811 private = (struct dasd_eckd_private *)device->private;
812 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
813 *uid = private->uid;
814 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
815 return 0;
816 }
817 return -EINVAL;
818 }
819
820 /*
821 * compare device UID with data of a given dasd_eckd_private structure
822 * return 0 for match
823 */
824 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
825 struct dasd_eckd_private *private)
826 {
827 struct dasd_uid device_uid;
828
829 create_uid(private);
830 dasd_eckd_get_uid(device, &device_uid);
831
832 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
833 }
834
835 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
836 struct dasd_ccw_req *cqr,
837 __u8 *rcd_buffer,
838 __u8 lpm)
839 {
840 struct ccw1 *ccw;
841 /*
842 * buffer has to start with EBCDIC "V1.0" to show
843 * support for virtual device SNEQ
844 */
845 rcd_buffer[0] = 0xE5;
846 rcd_buffer[1] = 0xF1;
847 rcd_buffer[2] = 0x4B;
848 rcd_buffer[3] = 0xF0;
849
850 ccw = cqr->cpaddr;
851 ccw->cmd_code = DASD_ECKD_CCW_RCD;
852 ccw->flags = 0;
853 ccw->cda = (__u32)(addr_t)rcd_buffer;
854 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
855 cqr->magic = DASD_ECKD_MAGIC;
856
857 cqr->startdev = device;
858 cqr->memdev = device;
859 cqr->block = NULL;
860 cqr->expires = 10*HZ;
861 cqr->lpm = lpm;
862 cqr->retries = 256;
863 cqr->buildclk = get_clock();
864 cqr->status = DASD_CQR_FILLED;
865 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
866 }
867
868 /*
869 * Wakeup helper for read_conf
870 * if the cqr is not done and needs some error recovery
871 * the buffer has to be re-initialized with the EBCDIC "V1.0"
872 * to show support for virtual device SNEQ
873 */
874 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
875 {
876 struct ccw1 *ccw;
877 __u8 *rcd_buffer;
878
879 if (cqr->status != DASD_CQR_DONE) {
880 ccw = cqr->cpaddr;
881 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
882 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
883
884 rcd_buffer[0] = 0xE5;
885 rcd_buffer[1] = 0xF1;
886 rcd_buffer[2] = 0x4B;
887 rcd_buffer[3] = 0xF0;
888 }
889 dasd_wakeup_cb(cqr, data);
890 }
891
892 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
893 struct dasd_ccw_req *cqr,
894 __u8 *rcd_buffer,
895 __u8 lpm)
896 {
897 struct ciw *ciw;
898 int rc;
899 /*
900 * sanity check: scan for RCD command in extended SenseID data
901 * some devices do not support RCD
902 */
903 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
904 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
905 return -EOPNOTSUPP;
906
907 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
908 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
909 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
910 cqr->retries = 5;
911 cqr->callback = read_conf_cb;
912 rc = dasd_sleep_on_immediatly(cqr);
913 return rc;
914 }
915
916 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
917 void **rcd_buffer,
918 int *rcd_buffer_size, __u8 lpm)
919 {
920 struct ciw *ciw;
921 char *rcd_buf = NULL;
922 int ret;
923 struct dasd_ccw_req *cqr;
924
925 /*
926 * sanity check: scan for RCD command in extended SenseID data
927 * some devices do not support RCD
928 */
929 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
930 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
931 ret = -EOPNOTSUPP;
932 goto out_error;
933 }
934 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
935 if (!rcd_buf) {
936 ret = -ENOMEM;
937 goto out_error;
938 }
939 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
940 0, /* use rcd_buf as data ara */
941 device);
942 if (IS_ERR(cqr)) {
943 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
944 "Could not allocate RCD request");
945 ret = -ENOMEM;
946 goto out_error;
947 }
948 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
949 cqr->callback = read_conf_cb;
950 ret = dasd_sleep_on(cqr);
951 /*
952 * on success we update the user input parms
953 */
954 dasd_sfree_request(cqr, cqr->memdev);
955 if (ret)
956 goto out_error;
957
958 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
959 *rcd_buffer = rcd_buf;
960 return 0;
961 out_error:
962 kfree(rcd_buf);
963 *rcd_buffer = NULL;
964 *rcd_buffer_size = 0;
965 return ret;
966 }
967
968 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
969 {
970
971 struct dasd_sneq *sneq;
972 int i, count;
973
974 private->ned = NULL;
975 private->sneq = NULL;
976 private->vdsneq = NULL;
977 private->gneq = NULL;
978 count = private->conf_len / sizeof(struct dasd_sneq);
979 sneq = (struct dasd_sneq *)private->conf_data;
980 for (i = 0; i < count; ++i) {
981 if (sneq->flags.identifier == 1 && sneq->format == 1)
982 private->sneq = sneq;
983 else if (sneq->flags.identifier == 1 && sneq->format == 4)
984 private->vdsneq = (struct vd_sneq *)sneq;
985 else if (sneq->flags.identifier == 2)
986 private->gneq = (struct dasd_gneq *)sneq;
987 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
988 private->ned = (struct dasd_ned *)sneq;
989 sneq++;
990 }
991 if (!private->ned || !private->gneq) {
992 private->ned = NULL;
993 private->sneq = NULL;
994 private->vdsneq = NULL;
995 private->gneq = NULL;
996 return -EINVAL;
997 }
998 return 0;
999
1000 };
1001
1002 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1003 {
1004 struct dasd_gneq *gneq;
1005 int i, count, found;
1006
1007 count = conf_len / sizeof(*gneq);
1008 gneq = (struct dasd_gneq *)conf_data;
1009 found = 0;
1010 for (i = 0; i < count; ++i) {
1011 if (gneq->flags.identifier == 2) {
1012 found = 1;
1013 break;
1014 }
1015 gneq++;
1016 }
1017 if (found)
1018 return ((char *)gneq)[18] & 0x07;
1019 else
1020 return 0;
1021 }
1022
1023 static int dasd_eckd_read_conf(struct dasd_device *device)
1024 {
1025 void *conf_data;
1026 int conf_len, conf_data_saved;
1027 int rc;
1028 __u8 lpm, opm;
1029 struct dasd_eckd_private *private, path_private;
1030 struct dasd_path *path_data;
1031 struct dasd_uid *uid;
1032 char print_path_uid[60], print_device_uid[60];
1033
1034 private = (struct dasd_eckd_private *) device->private;
1035 path_data = &device->path_data;
1036 opm = ccw_device_get_path_mask(device->cdev);
1037 conf_data_saved = 0;
1038 /* get configuration data per operational path */
1039 for (lpm = 0x80; lpm; lpm>>= 1) {
1040 if (!(lpm & opm))
1041 continue;
1042 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1043 &conf_len, lpm);
1044 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1045 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1046 "Read configuration data returned "
1047 "error %d", rc);
1048 return rc;
1049 }
1050 if (conf_data == NULL) {
1051 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1052 "No configuration data "
1053 "retrieved");
1054 /* no further analysis possible */
1055 path_data->opm |= lpm;
1056 continue; /* no error */
1057 }
1058 /* save first valid configuration data */
1059 if (!conf_data_saved) {
1060 kfree(private->conf_data);
1061 private->conf_data = conf_data;
1062 private->conf_len = conf_len;
1063 if (dasd_eckd_identify_conf_parts(private)) {
1064 private->conf_data = NULL;
1065 private->conf_len = 0;
1066 kfree(conf_data);
1067 continue;
1068 }
1069 /*
1070 * build device UID that other path data
1071 * can be compared to it
1072 */
1073 dasd_eckd_generate_uid(device);
1074 conf_data_saved++;
1075 } else {
1076 path_private.conf_data = conf_data;
1077 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1078 if (dasd_eckd_identify_conf_parts(
1079 &path_private)) {
1080 path_private.conf_data = NULL;
1081 path_private.conf_len = 0;
1082 kfree(conf_data);
1083 continue;
1084 }
1085
1086 if (dasd_eckd_compare_path_uid(
1087 device, &path_private)) {
1088 uid = &path_private.uid;
1089 if (strlen(uid->vduit) > 0)
1090 snprintf(print_path_uid,
1091 sizeof(print_path_uid),
1092 "%s.%s.%04x.%02x.%s",
1093 uid->vendor, uid->serial,
1094 uid->ssid, uid->real_unit_addr,
1095 uid->vduit);
1096 else
1097 snprintf(print_path_uid,
1098 sizeof(print_path_uid),
1099 "%s.%s.%04x.%02x",
1100 uid->vendor, uid->serial,
1101 uid->ssid,
1102 uid->real_unit_addr);
1103 uid = &private->uid;
1104 if (strlen(uid->vduit) > 0)
1105 snprintf(print_device_uid,
1106 sizeof(print_device_uid),
1107 "%s.%s.%04x.%02x.%s",
1108 uid->vendor, uid->serial,
1109 uid->ssid, uid->real_unit_addr,
1110 uid->vduit);
1111 else
1112 snprintf(print_device_uid,
1113 sizeof(print_device_uid),
1114 "%s.%s.%04x.%02x",
1115 uid->vendor, uid->serial,
1116 uid->ssid,
1117 uid->real_unit_addr);
1118 dev_err(&device->cdev->dev,
1119 "Not all channel paths lead to "
1120 "the same device, path %02X leads to "
1121 "device %s instead of %s\n", lpm,
1122 print_path_uid, print_device_uid);
1123 return -EINVAL;
1124 }
1125
1126 path_private.conf_data = NULL;
1127 path_private.conf_len = 0;
1128 }
1129 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1130 case 0x02:
1131 path_data->npm |= lpm;
1132 break;
1133 case 0x03:
1134 path_data->ppm |= lpm;
1135 break;
1136 }
1137 path_data->opm |= lpm;
1138
1139 if (conf_data != private->conf_data)
1140 kfree(conf_data);
1141 }
1142
1143 return 0;
1144 }
1145
1146 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1147 {
1148 struct dasd_eckd_private *private;
1149 int mdc;
1150 u32 fcx_max_data;
1151
1152 private = (struct dasd_eckd_private *) device->private;
1153 if (private->fcx_max_data) {
1154 mdc = ccw_device_get_mdc(device->cdev, lpm);
1155 if ((mdc < 0)) {
1156 dev_warn(&device->cdev->dev,
1157 "Detecting the maximum data size for zHPF "
1158 "requests failed (rc=%d) for a new path %x\n",
1159 mdc, lpm);
1160 return mdc;
1161 }
1162 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1163 if (fcx_max_data < private->fcx_max_data) {
1164 dev_warn(&device->cdev->dev,
1165 "The maximum data size for zHPF requests %u "
1166 "on a new path %x is below the active maximum "
1167 "%u\n", fcx_max_data, lpm,
1168 private->fcx_max_data);
1169 return -EACCES;
1170 }
1171 }
1172 return 0;
1173 }
1174
1175 static int rebuild_device_uid(struct dasd_device *device,
1176 struct path_verification_work_data *data)
1177 {
1178 struct dasd_eckd_private *private;
1179 struct dasd_path *path_data;
1180 __u8 lpm, opm;
1181 int rc;
1182
1183 rc = -ENODEV;
1184 private = (struct dasd_eckd_private *) device->private;
1185 path_data = &device->path_data;
1186 opm = device->path_data.opm;
1187
1188 for (lpm = 0x80; lpm; lpm >>= 1) {
1189 if (!(lpm & opm))
1190 continue;
1191 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1192 memset(&data->cqr, 0, sizeof(data->cqr));
1193 data->cqr.cpaddr = &data->ccw;
1194 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1195 data->rcd_buffer,
1196 lpm);
1197
1198 if (rc) {
1199 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1200 continue;
1201 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1202 "Read configuration data "
1203 "returned error %d", rc);
1204 break;
1205 }
1206 memcpy(private->conf_data, data->rcd_buffer,
1207 DASD_ECKD_RCD_DATA_SIZE);
1208 if (dasd_eckd_identify_conf_parts(private)) {
1209 rc = -ENODEV;
1210 } else /* first valid path is enough */
1211 break;
1212 }
1213
1214 if (!rc)
1215 rc = dasd_eckd_generate_uid(device);
1216
1217 return rc;
1218 }
1219
1220 static void do_path_verification_work(struct work_struct *work)
1221 {
1222 struct path_verification_work_data *data;
1223 struct dasd_device *device;
1224 struct dasd_eckd_private path_private;
1225 struct dasd_uid *uid;
1226 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1227 __u8 lpm, opm, npm, ppm, epm;
1228 unsigned long flags;
1229 char print_uid[60];
1230 int rc;
1231
1232 data = container_of(work, struct path_verification_work_data, worker);
1233 device = data->device;
1234
1235 /* delay path verification until device was resumed */
1236 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1237 schedule_work(work);
1238 return;
1239 }
1240
1241 opm = 0;
1242 npm = 0;
1243 ppm = 0;
1244 epm = 0;
1245 for (lpm = 0x80; lpm; lpm >>= 1) {
1246 if (!(lpm & data->tbvpm))
1247 continue;
1248 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1249 memset(&data->cqr, 0, sizeof(data->cqr));
1250 data->cqr.cpaddr = &data->ccw;
1251 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1252 data->rcd_buffer,
1253 lpm);
1254 if (!rc) {
1255 switch (dasd_eckd_path_access(data->rcd_buffer,
1256 DASD_ECKD_RCD_DATA_SIZE)
1257 ) {
1258 case 0x02:
1259 npm |= lpm;
1260 break;
1261 case 0x03:
1262 ppm |= lpm;
1263 break;
1264 }
1265 opm |= lpm;
1266 } else if (rc == -EOPNOTSUPP) {
1267 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1268 "path verification: No configuration "
1269 "data retrieved");
1270 opm |= lpm;
1271 } else if (rc == -EAGAIN) {
1272 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1273 "path verification: device is stopped,"
1274 " try again later");
1275 epm |= lpm;
1276 } else {
1277 dev_warn(&device->cdev->dev,
1278 "Reading device feature codes failed "
1279 "(rc=%d) for new path %x\n", rc, lpm);
1280 continue;
1281 }
1282 if (verify_fcx_max_data(device, lpm)) {
1283 opm &= ~lpm;
1284 npm &= ~lpm;
1285 ppm &= ~lpm;
1286 continue;
1287 }
1288
1289 /*
1290 * save conf_data for comparison after
1291 * rebuild_device_uid may have changed
1292 * the original data
1293 */
1294 memcpy(&path_rcd_buf, data->rcd_buffer,
1295 DASD_ECKD_RCD_DATA_SIZE);
1296 path_private.conf_data = (void *) &path_rcd_buf;
1297 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1298 if (dasd_eckd_identify_conf_parts(&path_private)) {
1299 path_private.conf_data = NULL;
1300 path_private.conf_len = 0;
1301 continue;
1302 }
1303
1304 /*
1305 * compare path UID with device UID only if at least
1306 * one valid path is left
1307 * in other case the device UID may have changed and
1308 * the first working path UID will be used as device UID
1309 */
1310 if (device->path_data.opm &&
1311 dasd_eckd_compare_path_uid(device, &path_private)) {
1312 /*
1313 * the comparison was not successful
1314 * rebuild the device UID with at least one
1315 * known path in case a z/VM hyperswap command
1316 * has changed the device
1317 *
1318 * after this compare again
1319 *
1320 * if either the rebuild or the recompare fails
1321 * the path can not be used
1322 */
1323 if (rebuild_device_uid(device, data) ||
1324 dasd_eckd_compare_path_uid(
1325 device, &path_private)) {
1326 uid = &path_private.uid;
1327 if (strlen(uid->vduit) > 0)
1328 snprintf(print_uid, sizeof(print_uid),
1329 "%s.%s.%04x.%02x.%s",
1330 uid->vendor, uid->serial,
1331 uid->ssid, uid->real_unit_addr,
1332 uid->vduit);
1333 else
1334 snprintf(print_uid, sizeof(print_uid),
1335 "%s.%s.%04x.%02x",
1336 uid->vendor, uid->serial,
1337 uid->ssid,
1338 uid->real_unit_addr);
1339 dev_err(&device->cdev->dev,
1340 "The newly added channel path %02X "
1341 "will not be used because it leads "
1342 "to a different device %s\n",
1343 lpm, print_uid);
1344 opm &= ~lpm;
1345 npm &= ~lpm;
1346 ppm &= ~lpm;
1347 continue;
1348 }
1349 }
1350
1351 /*
1352 * There is a small chance that a path is lost again between
1353 * above path verification and the following modification of
1354 * the device opm mask. We could avoid that race here by using
1355 * yet another path mask, but we rather deal with this unlikely
1356 * situation in dasd_start_IO.
1357 */
1358 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1359 if (!device->path_data.opm && opm) {
1360 device->path_data.opm = opm;
1361 dasd_generic_path_operational(device);
1362 } else
1363 device->path_data.opm |= opm;
1364 device->path_data.npm |= npm;
1365 device->path_data.ppm |= ppm;
1366 device->path_data.tbvpm |= epm;
1367 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1368 }
1369
1370 dasd_put_device(device);
1371 if (data->isglobal)
1372 mutex_unlock(&dasd_path_verification_mutex);
1373 else
1374 kfree(data);
1375 }
1376
1377 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1378 {
1379 struct path_verification_work_data *data;
1380
1381 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1382 if (!data) {
1383 if (mutex_trylock(&dasd_path_verification_mutex)) {
1384 data = path_verification_worker;
1385 data->isglobal = 1;
1386 } else
1387 return -ENOMEM;
1388 } else {
1389 memset(data, 0, sizeof(*data));
1390 data->isglobal = 0;
1391 }
1392 INIT_WORK(&data->worker, do_path_verification_work);
1393 dasd_get_device(device);
1394 data->device = device;
1395 data->tbvpm = lpm;
1396 schedule_work(&data->worker);
1397 return 0;
1398 }
1399
1400 static int dasd_eckd_read_features(struct dasd_device *device)
1401 {
1402 struct dasd_psf_prssd_data *prssdp;
1403 struct dasd_rssd_features *features;
1404 struct dasd_ccw_req *cqr;
1405 struct ccw1 *ccw;
1406 int rc;
1407 struct dasd_eckd_private *private;
1408
1409 private = (struct dasd_eckd_private *) device->private;
1410 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1411 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1412 (sizeof(struct dasd_psf_prssd_data) +
1413 sizeof(struct dasd_rssd_features)),
1414 device);
1415 if (IS_ERR(cqr)) {
1416 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1417 "allocate initialization request");
1418 return PTR_ERR(cqr);
1419 }
1420 cqr->startdev = device;
1421 cqr->memdev = device;
1422 cqr->block = NULL;
1423 cqr->retries = 256;
1424 cqr->expires = 10 * HZ;
1425
1426 /* Prepare for Read Subsystem Data */
1427 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1428 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1429 prssdp->order = PSF_ORDER_PRSSD;
1430 prssdp->suborder = 0x41; /* Read Feature Codes */
1431 /* all other bytes of prssdp must be zero */
1432
1433 ccw = cqr->cpaddr;
1434 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1435 ccw->count = sizeof(struct dasd_psf_prssd_data);
1436 ccw->flags |= CCW_FLAG_CC;
1437 ccw->cda = (__u32)(addr_t) prssdp;
1438
1439 /* Read Subsystem Data - feature codes */
1440 features = (struct dasd_rssd_features *) (prssdp + 1);
1441 memset(features, 0, sizeof(struct dasd_rssd_features));
1442
1443 ccw++;
1444 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1445 ccw->count = sizeof(struct dasd_rssd_features);
1446 ccw->cda = (__u32)(addr_t) features;
1447
1448 cqr->buildclk = get_clock();
1449 cqr->status = DASD_CQR_FILLED;
1450 rc = dasd_sleep_on(cqr);
1451 if (rc == 0) {
1452 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1453 features = (struct dasd_rssd_features *) (prssdp + 1);
1454 memcpy(&private->features, features,
1455 sizeof(struct dasd_rssd_features));
1456 } else
1457 dev_warn(&device->cdev->dev, "Reading device feature codes"
1458 " failed with rc=%d\n", rc);
1459 dasd_sfree_request(cqr, cqr->memdev);
1460 return rc;
1461 }
1462
1463
1464 /*
1465 * Build CP for Perform Subsystem Function - SSC.
1466 */
1467 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1468 int enable_pav)
1469 {
1470 struct dasd_ccw_req *cqr;
1471 struct dasd_psf_ssc_data *psf_ssc_data;
1472 struct ccw1 *ccw;
1473
1474 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1475 sizeof(struct dasd_psf_ssc_data),
1476 device);
1477
1478 if (IS_ERR(cqr)) {
1479 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1480 "Could not allocate PSF-SSC request");
1481 return cqr;
1482 }
1483 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1484 psf_ssc_data->order = PSF_ORDER_SSC;
1485 psf_ssc_data->suborder = 0xc0;
1486 if (enable_pav) {
1487 psf_ssc_data->suborder |= 0x08;
1488 psf_ssc_data->reserved[0] = 0x88;
1489 }
1490 ccw = cqr->cpaddr;
1491 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1492 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1493 ccw->count = 66;
1494
1495 cqr->startdev = device;
1496 cqr->memdev = device;
1497 cqr->block = NULL;
1498 cqr->retries = 256;
1499 cqr->expires = 10*HZ;
1500 cqr->buildclk = get_clock();
1501 cqr->status = DASD_CQR_FILLED;
1502 return cqr;
1503 }
1504
1505 /*
1506 * Perform Subsystem Function.
1507 * It is necessary to trigger CIO for channel revalidation since this
1508 * call might change behaviour of DASD devices.
1509 */
1510 static int
1511 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1512 {
1513 struct dasd_ccw_req *cqr;
1514 int rc;
1515
1516 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1517 if (IS_ERR(cqr))
1518 return PTR_ERR(cqr);
1519
1520 rc = dasd_sleep_on(cqr);
1521 if (!rc)
1522 /* trigger CIO to reprobe devices */
1523 css_schedule_reprobe();
1524 dasd_sfree_request(cqr, cqr->memdev);
1525 return rc;
1526 }
1527
1528 /*
1529 * Valide storage server of current device.
1530 */
1531 static void dasd_eckd_validate_server(struct dasd_device *device)
1532 {
1533 int rc;
1534 struct dasd_eckd_private *private;
1535 int enable_pav;
1536
1537 private = (struct dasd_eckd_private *) device->private;
1538 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1539 private->uid.type == UA_HYPER_PAV_ALIAS)
1540 return;
1541 if (dasd_nopav || MACHINE_IS_VM)
1542 enable_pav = 0;
1543 else
1544 enable_pav = 1;
1545 rc = dasd_eckd_psf_ssc(device, enable_pav);
1546
1547 /* may be requested feature is not available on server,
1548 * therefore just report error and go ahead */
1549 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1550 "returned rc=%d", private->uid.ssid, rc);
1551 }
1552
1553 /*
1554 * worker to do a validate server in case of a lost pathgroup
1555 */
1556 static void dasd_eckd_do_validate_server(struct work_struct *work)
1557 {
1558 struct dasd_device *device = container_of(work, struct dasd_device,
1559 kick_validate);
1560 dasd_eckd_validate_server(device);
1561 dasd_put_device(device);
1562 }
1563
1564 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1565 {
1566 dasd_get_device(device);
1567 /* exit if device not online or in offline processing */
1568 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1569 device->state < DASD_STATE_ONLINE) {
1570 dasd_put_device(device);
1571 return;
1572 }
1573 /* queue call to do_validate_server to the kernel event daemon. */
1574 schedule_work(&device->kick_validate);
1575 }
1576
1577 static u32 get_fcx_max_data(struct dasd_device *device)
1578 {
1579 #if defined(CONFIG_64BIT)
1580 int tpm, mdc;
1581 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1582 struct dasd_eckd_private *private;
1583
1584 if (dasd_nofcx)
1585 return 0;
1586 /* is transport mode supported? */
1587 private = (struct dasd_eckd_private *) device->private;
1588 fcx_in_css = css_general_characteristics.fcx;
1589 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1590 fcx_in_features = private->features.feature[40] & 0x80;
1591 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1592
1593 if (!tpm)
1594 return 0;
1595
1596 mdc = ccw_device_get_mdc(device->cdev, 0);
1597 if (mdc < 0) {
1598 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1599 " data size for zHPF requests failed\n");
1600 return 0;
1601 } else
1602 return mdc * FCX_MAX_DATA_FACTOR;
1603 #else
1604 return 0;
1605 #endif
1606 }
1607
1608 /*
1609 * Check device characteristics.
1610 * If the device is accessible using ECKD discipline, the device is enabled.
1611 */
1612 static int
1613 dasd_eckd_check_characteristics(struct dasd_device *device)
1614 {
1615 struct dasd_eckd_private *private;
1616 struct dasd_block *block;
1617 struct dasd_uid temp_uid;
1618 int rc, i;
1619 int readonly;
1620 unsigned long value;
1621
1622 /* setup work queue for validate server*/
1623 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1624
1625 if (!ccw_device_is_pathgroup(device->cdev)) {
1626 dev_warn(&device->cdev->dev,
1627 "A channel path group could not be established\n");
1628 return -EIO;
1629 }
1630 if (!ccw_device_is_multipath(device->cdev)) {
1631 dev_info(&device->cdev->dev,
1632 "The DASD is not operating in multipath mode\n");
1633 }
1634 private = (struct dasd_eckd_private *) device->private;
1635 if (!private) {
1636 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1637 if (!private) {
1638 dev_warn(&device->cdev->dev,
1639 "Allocating memory for private DASD data "
1640 "failed\n");
1641 return -ENOMEM;
1642 }
1643 device->private = (void *) private;
1644 } else {
1645 memset(private, 0, sizeof(*private));
1646 }
1647 /* Invalidate status of initial analysis. */
1648 private->init_cqr_status = -1;
1649 /* Set default cache operations. */
1650 private->attrib.operation = DASD_NORMAL_CACHE;
1651 private->attrib.nr_cyl = 0;
1652
1653 /* Read Configuration Data */
1654 rc = dasd_eckd_read_conf(device);
1655 if (rc)
1656 goto out_err1;
1657
1658 /* set default timeout */
1659 device->default_expires = DASD_EXPIRES;
1660 if (private->gneq) {
1661 value = 1;
1662 for (i = 0; i < private->gneq->timeout.value; i++)
1663 value = 10 * value;
1664 value = value * private->gneq->timeout.number;
1665 /* do not accept useless values */
1666 if (value != 0 && value <= DASD_EXPIRES_MAX)
1667 device->default_expires = value;
1668 }
1669
1670 dasd_eckd_get_uid(device, &temp_uid);
1671 if (temp_uid.type == UA_BASE_DEVICE) {
1672 block = dasd_alloc_block();
1673 if (IS_ERR(block)) {
1674 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1675 "could not allocate dasd "
1676 "block structure");
1677 rc = PTR_ERR(block);
1678 goto out_err1;
1679 }
1680 device->block = block;
1681 block->base = device;
1682 }
1683
1684 /* register lcu with alias handling, enable PAV */
1685 rc = dasd_alias_make_device_known_to_lcu(device);
1686 if (rc)
1687 goto out_err2;
1688
1689 dasd_eckd_validate_server(device);
1690
1691 /* device may report different configuration data after LCU setup */
1692 rc = dasd_eckd_read_conf(device);
1693 if (rc)
1694 goto out_err3;
1695
1696 /* Read Feature Codes */
1697 dasd_eckd_read_features(device);
1698
1699 /* Read Device Characteristics */
1700 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1701 &private->rdc_data, 64);
1702 if (rc) {
1703 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1704 "Read device characteristic failed, rc=%d", rc);
1705 goto out_err3;
1706 }
1707
1708 if ((device->features & DASD_FEATURE_USERAW) &&
1709 !(private->rdc_data.facilities.RT_in_LR)) {
1710 dev_err(&device->cdev->dev, "The storage server does not "
1711 "support raw-track access\n");
1712 rc = -EINVAL;
1713 goto out_err3;
1714 }
1715
1716 /* find the valid cylinder size */
1717 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1718 private->rdc_data.long_no_cyl)
1719 private->real_cyl = private->rdc_data.long_no_cyl;
1720 else
1721 private->real_cyl = private->rdc_data.no_cyl;
1722
1723 private->fcx_max_data = get_fcx_max_data(device);
1724
1725 readonly = dasd_device_is_ro(device);
1726 if (readonly)
1727 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1728
1729 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1730 "with %d cylinders, %d heads, %d sectors%s\n",
1731 private->rdc_data.dev_type,
1732 private->rdc_data.dev_model,
1733 private->rdc_data.cu_type,
1734 private->rdc_data.cu_model.model,
1735 private->real_cyl,
1736 private->rdc_data.trk_per_cyl,
1737 private->rdc_data.sec_per_trk,
1738 readonly ? ", read-only device" : "");
1739 return 0;
1740
1741 out_err3:
1742 dasd_alias_disconnect_device_from_lcu(device);
1743 out_err2:
1744 dasd_free_block(device->block);
1745 device->block = NULL;
1746 out_err1:
1747 kfree(private->conf_data);
1748 kfree(device->private);
1749 device->private = NULL;
1750 return rc;
1751 }
1752
1753 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1754 {
1755 struct dasd_eckd_private *private;
1756
1757 private = (struct dasd_eckd_private *) device->private;
1758 dasd_alias_disconnect_device_from_lcu(device);
1759 private->ned = NULL;
1760 private->sneq = NULL;
1761 private->vdsneq = NULL;
1762 private->gneq = NULL;
1763 private->conf_len = 0;
1764 kfree(private->conf_data);
1765 private->conf_data = NULL;
1766 }
1767
1768 static struct dasd_ccw_req *
1769 dasd_eckd_analysis_ccw(struct dasd_device *device)
1770 {
1771 struct dasd_eckd_private *private;
1772 struct eckd_count *count_data;
1773 struct LO_eckd_data *LO_data;
1774 struct dasd_ccw_req *cqr;
1775 struct ccw1 *ccw;
1776 int cplength, datasize;
1777 int i;
1778
1779 private = (struct dasd_eckd_private *) device->private;
1780
1781 cplength = 8;
1782 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1783 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1784 if (IS_ERR(cqr))
1785 return cqr;
1786 ccw = cqr->cpaddr;
1787 /* Define extent for the first 3 tracks. */
1788 define_extent(ccw++, cqr->data, 0, 2,
1789 DASD_ECKD_CCW_READ_COUNT, device);
1790 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1791 /* Locate record for the first 4 records on track 0. */
1792 ccw[-1].flags |= CCW_FLAG_CC;
1793 locate_record(ccw++, LO_data++, 0, 0, 4,
1794 DASD_ECKD_CCW_READ_COUNT, device, 0);
1795
1796 count_data = private->count_area;
1797 for (i = 0; i < 4; i++) {
1798 ccw[-1].flags |= CCW_FLAG_CC;
1799 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1800 ccw->flags = 0;
1801 ccw->count = 8;
1802 ccw->cda = (__u32)(addr_t) count_data;
1803 ccw++;
1804 count_data++;
1805 }
1806
1807 /* Locate record for the first record on track 2. */
1808 ccw[-1].flags |= CCW_FLAG_CC;
1809 locate_record(ccw++, LO_data++, 2, 0, 1,
1810 DASD_ECKD_CCW_READ_COUNT, device, 0);
1811 /* Read count ccw. */
1812 ccw[-1].flags |= CCW_FLAG_CC;
1813 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1814 ccw->flags = 0;
1815 ccw->count = 8;
1816 ccw->cda = (__u32)(addr_t) count_data;
1817
1818 cqr->block = NULL;
1819 cqr->startdev = device;
1820 cqr->memdev = device;
1821 cqr->retries = 255;
1822 cqr->buildclk = get_clock();
1823 cqr->status = DASD_CQR_FILLED;
1824 return cqr;
1825 }
1826
1827 /* differentiate between 'no record found' and any other error */
1828 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1829 {
1830 char *sense;
1831 if (init_cqr->status == DASD_CQR_DONE)
1832 return INIT_CQR_OK;
1833 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1834 init_cqr->status == DASD_CQR_FAILED) {
1835 sense = dasd_get_sense(&init_cqr->irb);
1836 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1837 return INIT_CQR_UNFORMATTED;
1838 else
1839 return INIT_CQR_ERROR;
1840 } else
1841 return INIT_CQR_ERROR;
1842 }
1843
1844 /*
1845 * This is the callback function for the init_analysis cqr. It saves
1846 * the status of the initial analysis ccw before it frees it and kicks
1847 * the device to continue the startup sequence. This will call
1848 * dasd_eckd_do_analysis again (if the devices has not been marked
1849 * for deletion in the meantime).
1850 */
1851 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1852 void *data)
1853 {
1854 struct dasd_eckd_private *private;
1855 struct dasd_device *device;
1856
1857 device = init_cqr->startdev;
1858 private = (struct dasd_eckd_private *) device->private;
1859 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1860 dasd_sfree_request(init_cqr, device);
1861 dasd_kick_device(device);
1862 }
1863
1864 static int dasd_eckd_start_analysis(struct dasd_block *block)
1865 {
1866 struct dasd_ccw_req *init_cqr;
1867
1868 init_cqr = dasd_eckd_analysis_ccw(block->base);
1869 if (IS_ERR(init_cqr))
1870 return PTR_ERR(init_cqr);
1871 init_cqr->callback = dasd_eckd_analysis_callback;
1872 init_cqr->callback_data = NULL;
1873 init_cqr->expires = 5*HZ;
1874 /* first try without ERP, so we can later handle unformatted
1875 * devices as special case
1876 */
1877 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1878 init_cqr->retries = 0;
1879 dasd_add_request_head(init_cqr);
1880 return -EAGAIN;
1881 }
1882
1883 static int dasd_eckd_end_analysis(struct dasd_block *block)
1884 {
1885 struct dasd_device *device;
1886 struct dasd_eckd_private *private;
1887 struct eckd_count *count_area;
1888 unsigned int sb, blk_per_trk;
1889 int status, i;
1890 struct dasd_ccw_req *init_cqr;
1891
1892 device = block->base;
1893 private = (struct dasd_eckd_private *) device->private;
1894 status = private->init_cqr_status;
1895 private->init_cqr_status = -1;
1896 if (status == INIT_CQR_ERROR) {
1897 /* try again, this time with full ERP */
1898 init_cqr = dasd_eckd_analysis_ccw(device);
1899 dasd_sleep_on(init_cqr);
1900 status = dasd_eckd_analysis_evaluation(init_cqr);
1901 dasd_sfree_request(init_cqr, device);
1902 }
1903
1904 if (device->features & DASD_FEATURE_USERAW) {
1905 block->bp_block = DASD_RAW_BLOCKSIZE;
1906 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1907 block->s2b_shift = 3;
1908 goto raw;
1909 }
1910
1911 if (status == INIT_CQR_UNFORMATTED) {
1912 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1913 return -EMEDIUMTYPE;
1914 } else if (status == INIT_CQR_ERROR) {
1915 dev_err(&device->cdev->dev,
1916 "Detecting the DASD disk layout failed because "
1917 "of an I/O error\n");
1918 return -EIO;
1919 }
1920
1921 private->uses_cdl = 1;
1922 /* Check Track 0 for Compatible Disk Layout */
1923 count_area = NULL;
1924 for (i = 0; i < 3; i++) {
1925 if (private->count_area[i].kl != 4 ||
1926 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1927 private->uses_cdl = 0;
1928 break;
1929 }
1930 }
1931 if (i == 3)
1932 count_area = &private->count_area[4];
1933
1934 if (private->uses_cdl == 0) {
1935 for (i = 0; i < 5; i++) {
1936 if ((private->count_area[i].kl != 0) ||
1937 (private->count_area[i].dl !=
1938 private->count_area[0].dl))
1939 break;
1940 }
1941 if (i == 5)
1942 count_area = &private->count_area[0];
1943 } else {
1944 if (private->count_area[3].record == 1)
1945 dev_warn(&device->cdev->dev,
1946 "Track 0 has no records following the VTOC\n");
1947 }
1948
1949 if (count_area != NULL && count_area->kl == 0) {
1950 /* we found notthing violating our disk layout */
1951 if (dasd_check_blocksize(count_area->dl) == 0)
1952 block->bp_block = count_area->dl;
1953 }
1954 if (block->bp_block == 0) {
1955 dev_warn(&device->cdev->dev,
1956 "The disk layout of the DASD is not supported\n");
1957 return -EMEDIUMTYPE;
1958 }
1959 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1960 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1961 block->s2b_shift++;
1962
1963 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1964
1965 raw:
1966 block->blocks = (private->real_cyl *
1967 private->rdc_data.trk_per_cyl *
1968 blk_per_trk);
1969
1970 dev_info(&device->cdev->dev,
1971 "DASD with %d KB/block, %d KB total size, %d KB/track, "
1972 "%s\n", (block->bp_block >> 10),
1973 ((private->real_cyl *
1974 private->rdc_data.trk_per_cyl *
1975 blk_per_trk * (block->bp_block >> 9)) >> 1),
1976 ((blk_per_trk * block->bp_block) >> 10),
1977 private->uses_cdl ?
1978 "compatible disk layout" : "linux disk layout");
1979
1980 return 0;
1981 }
1982
1983 static int dasd_eckd_do_analysis(struct dasd_block *block)
1984 {
1985 struct dasd_eckd_private *private;
1986
1987 private = (struct dasd_eckd_private *) block->base->private;
1988 if (private->init_cqr_status < 0)
1989 return dasd_eckd_start_analysis(block);
1990 else
1991 return dasd_eckd_end_analysis(block);
1992 }
1993
1994 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1995 {
1996 return dasd_alias_add_device(device);
1997 };
1998
1999 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2000 {
2001 cancel_work_sync(&device->reload_device);
2002 cancel_work_sync(&device->kick_validate);
2003 return dasd_alias_remove_device(device);
2004 };
2005
2006 static int
2007 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2008 {
2009 struct dasd_eckd_private *private;
2010
2011 private = (struct dasd_eckd_private *) block->base->private;
2012 if (dasd_check_blocksize(block->bp_block) == 0) {
2013 geo->sectors = recs_per_track(&private->rdc_data,
2014 0, block->bp_block);
2015 }
2016 geo->cylinders = private->rdc_data.no_cyl;
2017 geo->heads = private->rdc_data.trk_per_cyl;
2018 return 0;
2019 }
2020
2021 static struct dasd_ccw_req *
2022 dasd_eckd_format_device(struct dasd_device * device,
2023 struct format_data_t * fdata)
2024 {
2025 struct dasd_eckd_private *private;
2026 struct dasd_ccw_req *fcp;
2027 struct eckd_count *ect;
2028 struct ccw1 *ccw;
2029 void *data;
2030 int rpt;
2031 struct ch_t address;
2032 int cplength, datasize;
2033 int i;
2034 int intensity = 0;
2035 int r0_perm;
2036
2037 private = (struct dasd_eckd_private *) device->private;
2038 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2039 set_ch_t(&address,
2040 fdata->start_unit / private->rdc_data.trk_per_cyl,
2041 fdata->start_unit % private->rdc_data.trk_per_cyl);
2042
2043 /* Sanity checks. */
2044 if (fdata->start_unit >=
2045 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2046 dev_warn(&device->cdev->dev, "Start track number %d used in "
2047 "formatting is too big\n", fdata->start_unit);
2048 return ERR_PTR(-EINVAL);
2049 }
2050 if (fdata->start_unit > fdata->stop_unit) {
2051 dev_warn(&device->cdev->dev, "Start track %d used in "
2052 "formatting exceeds end track\n", fdata->start_unit);
2053 return ERR_PTR(-EINVAL);
2054 }
2055 if (dasd_check_blocksize(fdata->blksize) != 0) {
2056 dev_warn(&device->cdev->dev,
2057 "The DASD cannot be formatted with block size %d\n",
2058 fdata->blksize);
2059 return ERR_PTR(-EINVAL);
2060 }
2061
2062 /*
2063 * fdata->intensity is a bit string that tells us what to do:
2064 * Bit 0: write record zero
2065 * Bit 1: write home address, currently not supported
2066 * Bit 2: invalidate tracks
2067 * Bit 3: use OS/390 compatible disk layout (cdl)
2068 * Bit 4: do not allow storage subsystem to modify record zero
2069 * Only some bit combinations do make sense.
2070 */
2071 if (fdata->intensity & 0x10) {
2072 r0_perm = 0;
2073 intensity = fdata->intensity & ~0x10;
2074 } else {
2075 r0_perm = 1;
2076 intensity = fdata->intensity;
2077 }
2078 switch (intensity) {
2079 case 0x00: /* Normal format */
2080 case 0x08: /* Normal format, use cdl. */
2081 cplength = 2 + rpt;
2082 datasize = sizeof(struct DE_eckd_data) +
2083 sizeof(struct LO_eckd_data) +
2084 rpt * sizeof(struct eckd_count);
2085 break;
2086 case 0x01: /* Write record zero and format track. */
2087 case 0x09: /* Write record zero and format track, use cdl. */
2088 cplength = 3 + rpt;
2089 datasize = sizeof(struct DE_eckd_data) +
2090 sizeof(struct LO_eckd_data) +
2091 sizeof(struct eckd_count) +
2092 rpt * sizeof(struct eckd_count);
2093 break;
2094 case 0x04: /* Invalidate track. */
2095 case 0x0c: /* Invalidate track, use cdl. */
2096 cplength = 3;
2097 datasize = sizeof(struct DE_eckd_data) +
2098 sizeof(struct LO_eckd_data) +
2099 sizeof(struct eckd_count);
2100 break;
2101 default:
2102 dev_warn(&device->cdev->dev, "An I/O control call used "
2103 "incorrect flags 0x%x\n", fdata->intensity);
2104 return ERR_PTR(-EINVAL);
2105 }
2106 /* Allocate the format ccw request. */
2107 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2108 if (IS_ERR(fcp))
2109 return fcp;
2110
2111 data = fcp->data;
2112 ccw = fcp->cpaddr;
2113
2114 switch (intensity & ~0x08) {
2115 case 0x00: /* Normal format. */
2116 define_extent(ccw++, (struct DE_eckd_data *) data,
2117 fdata->start_unit, fdata->start_unit,
2118 DASD_ECKD_CCW_WRITE_CKD, device);
2119 /* grant subsystem permission to format R0 */
2120 if (r0_perm)
2121 ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2122 data += sizeof(struct DE_eckd_data);
2123 ccw[-1].flags |= CCW_FLAG_CC;
2124 locate_record(ccw++, (struct LO_eckd_data *) data,
2125 fdata->start_unit, 0, rpt,
2126 DASD_ECKD_CCW_WRITE_CKD, device,
2127 fdata->blksize);
2128 data += sizeof(struct LO_eckd_data);
2129 break;
2130 case 0x01: /* Write record zero + format track. */
2131 define_extent(ccw++, (struct DE_eckd_data *) data,
2132 fdata->start_unit, fdata->start_unit,
2133 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2134 device);
2135 data += sizeof(struct DE_eckd_data);
2136 ccw[-1].flags |= CCW_FLAG_CC;
2137 locate_record(ccw++, (struct LO_eckd_data *) data,
2138 fdata->start_unit, 0, rpt + 1,
2139 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2140 device->block->bp_block);
2141 data += sizeof(struct LO_eckd_data);
2142 break;
2143 case 0x04: /* Invalidate track. */
2144 define_extent(ccw++, (struct DE_eckd_data *) data,
2145 fdata->start_unit, fdata->start_unit,
2146 DASD_ECKD_CCW_WRITE_CKD, device);
2147 data += sizeof(struct DE_eckd_data);
2148 ccw[-1].flags |= CCW_FLAG_CC;
2149 locate_record(ccw++, (struct LO_eckd_data *) data,
2150 fdata->start_unit, 0, 1,
2151 DASD_ECKD_CCW_WRITE_CKD, device, 8);
2152 data += sizeof(struct LO_eckd_data);
2153 break;
2154 }
2155 if (intensity & 0x01) { /* write record zero */
2156 ect = (struct eckd_count *) data;
2157 data += sizeof(struct eckd_count);
2158 ect->cyl = address.cyl;
2159 ect->head = address.head;
2160 ect->record = 0;
2161 ect->kl = 0;
2162 ect->dl = 8;
2163 ccw[-1].flags |= CCW_FLAG_CC;
2164 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2165 ccw->flags = CCW_FLAG_SLI;
2166 ccw->count = 8;
2167 ccw->cda = (__u32)(addr_t) ect;
2168 ccw++;
2169 }
2170 if ((intensity & ~0x08) & 0x04) { /* erase track */
2171 ect = (struct eckd_count *) data;
2172 data += sizeof(struct eckd_count);
2173 ect->cyl = address.cyl;
2174 ect->head = address.head;
2175 ect->record = 1;
2176 ect->kl = 0;
2177 ect->dl = 0;
2178 ccw[-1].flags |= CCW_FLAG_CC;
2179 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2180 ccw->flags = CCW_FLAG_SLI;
2181 ccw->count = 8;
2182 ccw->cda = (__u32)(addr_t) ect;
2183 } else { /* write remaining records */
2184 for (i = 0; i < rpt; i++) {
2185 ect = (struct eckd_count *) data;
2186 data += sizeof(struct eckd_count);
2187 ect->cyl = address.cyl;
2188 ect->head = address.head;
2189 ect->record = i + 1;
2190 ect->kl = 0;
2191 ect->dl = fdata->blksize;
2192 /* Check for special tracks 0-1 when formatting CDL */
2193 if ((intensity & 0x08) &&
2194 fdata->start_unit == 0) {
2195 if (i < 3) {
2196 ect->kl = 4;
2197 ect->dl = sizes_trk0[i] - 4;
2198 }
2199 }
2200 if ((intensity & 0x08) &&
2201 fdata->start_unit == 1) {
2202 ect->kl = 44;
2203 ect->dl = LABEL_SIZE - 44;
2204 }
2205 ccw[-1].flags |= CCW_FLAG_CC;
2206 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2207 ccw->flags = CCW_FLAG_SLI;
2208 ccw->count = 8;
2209 ccw->cda = (__u32)(addr_t) ect;
2210 ccw++;
2211 }
2212 }
2213 fcp->startdev = device;
2214 fcp->memdev = device;
2215 fcp->retries = 256;
2216 fcp->buildclk = get_clock();
2217 fcp->status = DASD_CQR_FILLED;
2218 return fcp;
2219 }
2220
2221 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2222 {
2223 cqr->status = DASD_CQR_FILLED;
2224 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2225 dasd_eckd_reset_ccw_to_base_io(cqr);
2226 cqr->startdev = cqr->block->base;
2227 cqr->lpm = cqr->block->base->path_data.opm;
2228 }
2229 };
2230
2231 static dasd_erp_fn_t
2232 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2233 {
2234 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2235 struct ccw_device *cdev = device->cdev;
2236
2237 switch (cdev->id.cu_type) {
2238 case 0x3990:
2239 case 0x2105:
2240 case 0x2107:
2241 case 0x1750:
2242 return dasd_3990_erp_action;
2243 case 0x9343:
2244 case 0x3880:
2245 default:
2246 return dasd_default_erp_action;
2247 }
2248 }
2249
2250 static dasd_erp_fn_t
2251 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2252 {
2253 return dasd_default_erp_postaction;
2254 }
2255
2256 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2257 struct dasd_ccw_req *cqr,
2258 struct irb *irb)
2259 {
2260 char mask;
2261 char *sense = NULL;
2262 struct dasd_eckd_private *private;
2263
2264 private = (struct dasd_eckd_private *) device->private;
2265 /* first of all check for state change pending interrupt */
2266 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2267 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2268 /*
2269 * for alias only, not in offline processing
2270 * and only if not suspended
2271 */
2272 if (!device->block && private->lcu &&
2273 device->state == DASD_STATE_ONLINE &&
2274 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2275 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2276 /*
2277 * the state change could be caused by an alias
2278 * reassignment remove device from alias handling
2279 * to prevent new requests from being scheduled on
2280 * the wrong alias device
2281 */
2282 dasd_alias_remove_device(device);
2283
2284 /* schedule worker to reload device */
2285 dasd_reload_device(device);
2286 }
2287 dasd_generic_handle_state_change(device);
2288 return;
2289 }
2290
2291 sense = dasd_get_sense(irb);
2292 if (!sense)
2293 return;
2294
2295 /* summary unit check */
2296 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2297 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2298 dasd_alias_handle_summary_unit_check(device, irb);
2299 return;
2300 }
2301
2302 /* service information message SIM */
2303 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2304 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2305 dasd_3990_erp_handle_sim(device, sense);
2306 return;
2307 }
2308
2309 /* loss of device reservation is handled via base devices only
2310 * as alias devices may be used with several bases
2311 */
2312 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2313 (sense[7] == 0x3F) &&
2314 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2315 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2316 if (device->features & DASD_FEATURE_FAILONSLCK)
2317 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2318 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2319 dev_err(&device->cdev->dev,
2320 "The device reservation was lost\n");
2321 }
2322 }
2323
2324 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2325 struct dasd_device *startdev,
2326 struct dasd_block *block,
2327 struct request *req,
2328 sector_t first_rec,
2329 sector_t last_rec,
2330 sector_t first_trk,
2331 sector_t last_trk,
2332 unsigned int first_offs,
2333 unsigned int last_offs,
2334 unsigned int blk_per_trk,
2335 unsigned int blksize)
2336 {
2337 struct dasd_eckd_private *private;
2338 unsigned long *idaws;
2339 struct LO_eckd_data *LO_data;
2340 struct dasd_ccw_req *cqr;
2341 struct ccw1 *ccw;
2342 struct req_iterator iter;
2343 struct bio_vec *bv;
2344 char *dst;
2345 unsigned int off;
2346 int count, cidaw, cplength, datasize;
2347 sector_t recid;
2348 unsigned char cmd, rcmd;
2349 int use_prefix;
2350 struct dasd_device *basedev;
2351
2352 basedev = block->base;
2353 private = (struct dasd_eckd_private *) basedev->private;
2354 if (rq_data_dir(req) == READ)
2355 cmd = DASD_ECKD_CCW_READ_MT;
2356 else if (rq_data_dir(req) == WRITE)
2357 cmd = DASD_ECKD_CCW_WRITE_MT;
2358 else
2359 return ERR_PTR(-EINVAL);
2360
2361 /* Check struct bio and count the number of blocks for the request. */
2362 count = 0;
2363 cidaw = 0;
2364 rq_for_each_segment(bv, req, iter) {
2365 if (bv->bv_len & (blksize - 1))
2366 /* Eckd can only do full blocks. */
2367 return ERR_PTR(-EINVAL);
2368 count += bv->bv_len >> (block->s2b_shift + 9);
2369 #if defined(CONFIG_64BIT)
2370 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2371 cidaw += bv->bv_len >> (block->s2b_shift + 9);
2372 #endif
2373 }
2374 /* Paranoia. */
2375 if (count != last_rec - first_rec + 1)
2376 return ERR_PTR(-EINVAL);
2377
2378 /* use the prefix command if available */
2379 use_prefix = private->features.feature[8] & 0x01;
2380 if (use_prefix) {
2381 /* 1x prefix + number of blocks */
2382 cplength = 2 + count;
2383 /* 1x prefix + cidaws*sizeof(long) */
2384 datasize = sizeof(struct PFX_eckd_data) +
2385 sizeof(struct LO_eckd_data) +
2386 cidaw * sizeof(unsigned long);
2387 } else {
2388 /* 1x define extent + 1x locate record + number of blocks */
2389 cplength = 2 + count;
2390 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2391 datasize = sizeof(struct DE_eckd_data) +
2392 sizeof(struct LO_eckd_data) +
2393 cidaw * sizeof(unsigned long);
2394 }
2395 /* Find out the number of additional locate record ccws for cdl. */
2396 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2397 if (last_rec >= 2*blk_per_trk)
2398 count = 2*blk_per_trk - first_rec;
2399 cplength += count;
2400 datasize += count*sizeof(struct LO_eckd_data);
2401 }
2402 /* Allocate the ccw request. */
2403 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2404 startdev);
2405 if (IS_ERR(cqr))
2406 return cqr;
2407 ccw = cqr->cpaddr;
2408 /* First ccw is define extent or prefix. */
2409 if (use_prefix) {
2410 if (prefix(ccw++, cqr->data, first_trk,
2411 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2412 /* Clock not in sync and XRC is enabled.
2413 * Try again later.
2414 */
2415 dasd_sfree_request(cqr, startdev);
2416 return ERR_PTR(-EAGAIN);
2417 }
2418 idaws = (unsigned long *) (cqr->data +
2419 sizeof(struct PFX_eckd_data));
2420 } else {
2421 if (define_extent(ccw++, cqr->data, first_trk,
2422 last_trk, cmd, basedev) == -EAGAIN) {
2423 /* Clock not in sync and XRC is enabled.
2424 * Try again later.
2425 */
2426 dasd_sfree_request(cqr, startdev);
2427 return ERR_PTR(-EAGAIN);
2428 }
2429 idaws = (unsigned long *) (cqr->data +
2430 sizeof(struct DE_eckd_data));
2431 }
2432 /* Build locate_record+read/write/ccws. */
2433 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2434 recid = first_rec;
2435 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2436 /* Only standard blocks so there is just one locate record. */
2437 ccw[-1].flags |= CCW_FLAG_CC;
2438 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2439 last_rec - recid + 1, cmd, basedev, blksize);
2440 }
2441 rq_for_each_segment(bv, req, iter) {
2442 dst = page_address(bv->bv_page) + bv->bv_offset;
2443 if (dasd_page_cache) {
2444 char *copy = kmem_cache_alloc(dasd_page_cache,
2445 GFP_DMA | __GFP_NOWARN);
2446 if (copy && rq_data_dir(req) == WRITE)
2447 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2448 if (copy)
2449 dst = copy + bv->bv_offset;
2450 }
2451 for (off = 0; off < bv->bv_len; off += blksize) {
2452 sector_t trkid = recid;
2453 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2454 rcmd = cmd;
2455 count = blksize;
2456 /* Locate record for cdl special block ? */
2457 if (private->uses_cdl && recid < 2*blk_per_trk) {
2458 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2459 rcmd |= 0x8;
2460 count = dasd_eckd_cdl_reclen(recid);
2461 if (count < blksize &&
2462 rq_data_dir(req) == READ)
2463 memset(dst + count, 0xe5,
2464 blksize - count);
2465 }
2466 ccw[-1].flags |= CCW_FLAG_CC;
2467 locate_record(ccw++, LO_data++,
2468 trkid, recoffs + 1,
2469 1, rcmd, basedev, count);
2470 }
2471 /* Locate record for standard blocks ? */
2472 if (private->uses_cdl && recid == 2*blk_per_trk) {
2473 ccw[-1].flags |= CCW_FLAG_CC;
2474 locate_record(ccw++, LO_data++,
2475 trkid, recoffs + 1,
2476 last_rec - recid + 1,
2477 cmd, basedev, count);
2478 }
2479 /* Read/write ccw. */
2480 ccw[-1].flags |= CCW_FLAG_CC;
2481 ccw->cmd_code = rcmd;
2482 ccw->count = count;
2483 if (idal_is_needed(dst, blksize)) {
2484 ccw->cda = (__u32)(addr_t) idaws;
2485 ccw->flags = CCW_FLAG_IDA;
2486 idaws = idal_create_words(idaws, dst, blksize);
2487 } else {
2488 ccw->cda = (__u32)(addr_t) dst;
2489 ccw->flags = 0;
2490 }
2491 ccw++;
2492 dst += blksize;
2493 recid++;
2494 }
2495 }
2496 if (blk_noretry_request(req) ||
2497 block->base->features & DASD_FEATURE_FAILFAST)
2498 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2499 cqr->startdev = startdev;
2500 cqr->memdev = startdev;
2501 cqr->block = block;
2502 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2503 cqr->lpm = startdev->path_data.ppm;
2504 cqr->retries = 256;
2505 cqr->buildclk = get_clock();
2506 cqr->status = DASD_CQR_FILLED;
2507 return cqr;
2508 }
2509
2510 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2511 struct dasd_device *startdev,
2512 struct dasd_block *block,
2513 struct request *req,
2514 sector_t first_rec,
2515 sector_t last_rec,
2516 sector_t first_trk,
2517 sector_t last_trk,
2518 unsigned int first_offs,
2519 unsigned int last_offs,
2520 unsigned int blk_per_trk,
2521 unsigned int blksize)
2522 {
2523 unsigned long *idaws;
2524 struct dasd_ccw_req *cqr;
2525 struct ccw1 *ccw;
2526 struct req_iterator iter;
2527 struct bio_vec *bv;
2528 char *dst, *idaw_dst;
2529 unsigned int cidaw, cplength, datasize;
2530 unsigned int tlf;
2531 sector_t recid;
2532 unsigned char cmd;
2533 struct dasd_device *basedev;
2534 unsigned int trkcount, count, count_to_trk_end;
2535 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2536 unsigned char new_track, end_idaw;
2537 sector_t trkid;
2538 unsigned int recoffs;
2539
2540 basedev = block->base;
2541 if (rq_data_dir(req) == READ)
2542 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2543 else if (rq_data_dir(req) == WRITE)
2544 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2545 else
2546 return ERR_PTR(-EINVAL);
2547
2548 /* Track based I/O needs IDAWs for each page, and not just for
2549 * 64 bit addresses. We need additional idals for pages
2550 * that get filled from two tracks, so we use the number
2551 * of records as upper limit.
2552 */
2553 cidaw = last_rec - first_rec + 1;
2554 trkcount = last_trk - first_trk + 1;
2555
2556 /* 1x prefix + one read/write ccw per track */
2557 cplength = 1 + trkcount;
2558
2559 /* on 31-bit we need space for two 32 bit addresses per page
2560 * on 64-bit one 64 bit address
2561 */
2562 datasize = sizeof(struct PFX_eckd_data) +
2563 cidaw * sizeof(unsigned long long);
2564
2565 /* Allocate the ccw request. */
2566 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2567 startdev);
2568 if (IS_ERR(cqr))
2569 return cqr;
2570 ccw = cqr->cpaddr;
2571 /* transfer length factor: how many bytes to read from the last track */
2572 if (first_trk == last_trk)
2573 tlf = last_offs - first_offs + 1;
2574 else
2575 tlf = last_offs + 1;
2576 tlf *= blksize;
2577
2578 if (prefix_LRE(ccw++, cqr->data, first_trk,
2579 last_trk, cmd, basedev, startdev,
2580 1 /* format */, first_offs + 1,
2581 trkcount, blksize,
2582 tlf) == -EAGAIN) {
2583 /* Clock not in sync and XRC is enabled.
2584 * Try again later.
2585 */
2586 dasd_sfree_request(cqr, startdev);
2587 return ERR_PTR(-EAGAIN);
2588 }
2589
2590 /*
2591 * The translation of request into ccw programs must meet the
2592 * following conditions:
2593 * - all idaws but the first and the last must address full pages
2594 * (or 2K blocks on 31-bit)
2595 * - the scope of a ccw and it's idal ends with the track boundaries
2596 */
2597 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2598 recid = first_rec;
2599 new_track = 1;
2600 end_idaw = 0;
2601 len_to_track_end = 0;
2602 idaw_dst = NULL;
2603 idaw_len = 0;
2604 rq_for_each_segment(bv, req, iter) {
2605 dst = page_address(bv->bv_page) + bv->bv_offset;
2606 seg_len = bv->bv_len;
2607 while (seg_len) {
2608 if (new_track) {
2609 trkid = recid;
2610 recoffs = sector_div(trkid, blk_per_trk);
2611 count_to_trk_end = blk_per_trk - recoffs;
2612 count = min((last_rec - recid + 1),
2613 (sector_t)count_to_trk_end);
2614 len_to_track_end = count * blksize;
2615 ccw[-1].flags |= CCW_FLAG_CC;
2616 ccw->cmd_code = cmd;
2617 ccw->count = len_to_track_end;
2618 ccw->cda = (__u32)(addr_t)idaws;
2619 ccw->flags = CCW_FLAG_IDA;
2620 ccw++;
2621 recid += count;
2622 new_track = 0;
2623 /* first idaw for a ccw may start anywhere */
2624 if (!idaw_dst)
2625 idaw_dst = dst;
2626 }
2627 /* If we start a new idaw, we must make sure that it
2628 * starts on an IDA_BLOCK_SIZE boundary.
2629 * If we continue an idaw, we must make sure that the
2630 * current segment begins where the so far accumulated
2631 * idaw ends
2632 */
2633 if (!idaw_dst) {
2634 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2635 dasd_sfree_request(cqr, startdev);
2636 return ERR_PTR(-ERANGE);
2637 } else
2638 idaw_dst = dst;
2639 }
2640 if ((idaw_dst + idaw_len) != dst) {
2641 dasd_sfree_request(cqr, startdev);
2642 return ERR_PTR(-ERANGE);
2643 }
2644 part_len = min(seg_len, len_to_track_end);
2645 seg_len -= part_len;
2646 dst += part_len;
2647 idaw_len += part_len;
2648 len_to_track_end -= part_len;
2649 /* collected memory area ends on an IDA_BLOCK border,
2650 * -> create an idaw
2651 * idal_create_words will handle cases where idaw_len
2652 * is larger then IDA_BLOCK_SIZE
2653 */
2654 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2655 end_idaw = 1;
2656 /* We also need to end the idaw at track end */
2657 if (!len_to_track_end) {
2658 new_track = 1;
2659 end_idaw = 1;
2660 }
2661 if (end_idaw) {
2662 idaws = idal_create_words(idaws, idaw_dst,
2663 idaw_len);
2664 idaw_dst = NULL;
2665 idaw_len = 0;
2666 end_idaw = 0;
2667 }
2668 }
2669 }
2670
2671 if (blk_noretry_request(req) ||
2672 block->base->features & DASD_FEATURE_FAILFAST)
2673 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2674 cqr->startdev = startdev;
2675 cqr->memdev = startdev;
2676 cqr->block = block;
2677 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2678 cqr->lpm = startdev->path_data.ppm;
2679 cqr->retries = 256;
2680 cqr->buildclk = get_clock();
2681 cqr->status = DASD_CQR_FILLED;
2682 return cqr;
2683 }
2684
2685 static int prepare_itcw(struct itcw *itcw,
2686 unsigned int trk, unsigned int totrk, int cmd,
2687 struct dasd_device *basedev,
2688 struct dasd_device *startdev,
2689 unsigned int rec_on_trk, int count,
2690 unsigned int blksize,
2691 unsigned int total_data_size,
2692 unsigned int tlf,
2693 unsigned int blk_per_trk)
2694 {
2695 struct PFX_eckd_data pfxdata;
2696 struct dasd_eckd_private *basepriv, *startpriv;
2697 struct DE_eckd_data *dedata;
2698 struct LRE_eckd_data *lredata;
2699 struct dcw *dcw;
2700
2701 u32 begcyl, endcyl;
2702 u16 heads, beghead, endhead;
2703 u8 pfx_cmd;
2704
2705 int rc = 0;
2706 int sector = 0;
2707 int dn, d;
2708
2709
2710 /* setup prefix data */
2711 basepriv = (struct dasd_eckd_private *) basedev->private;
2712 startpriv = (struct dasd_eckd_private *) startdev->private;
2713 dedata = &pfxdata.define_extent;
2714 lredata = &pfxdata.locate_record;
2715
2716 memset(&pfxdata, 0, sizeof(pfxdata));
2717 pfxdata.format = 1; /* PFX with LRE */
2718 pfxdata.base_address = basepriv->ned->unit_addr;
2719 pfxdata.base_lss = basepriv->ned->ID;
2720 pfxdata.validity.define_extent = 1;
2721
2722 /* private uid is kept up to date, conf_data may be outdated */
2723 if (startpriv->uid.type != UA_BASE_DEVICE) {
2724 pfxdata.validity.verify_base = 1;
2725 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2726 pfxdata.validity.hyper_pav = 1;
2727 }
2728
2729 switch (cmd) {
2730 case DASD_ECKD_CCW_READ_TRACK_DATA:
2731 dedata->mask.perm = 0x1;
2732 dedata->attributes.operation = basepriv->attrib.operation;
2733 dedata->blk_size = blksize;
2734 dedata->ga_extended |= 0x42;
2735 lredata->operation.orientation = 0x0;
2736 lredata->operation.operation = 0x0C;
2737 lredata->auxiliary.check_bytes = 0x01;
2738 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2739 break;
2740 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2741 dedata->mask.perm = 0x02;
2742 dedata->attributes.operation = basepriv->attrib.operation;
2743 dedata->blk_size = blksize;
2744 rc = check_XRC_on_prefix(&pfxdata, basedev);
2745 dedata->ga_extended |= 0x42;
2746 lredata->operation.orientation = 0x0;
2747 lredata->operation.operation = 0x3F;
2748 lredata->extended_operation = 0x23;
2749 lredata->auxiliary.check_bytes = 0x2;
2750 pfx_cmd = DASD_ECKD_CCW_PFX;
2751 break;
2752 default:
2753 DBF_DEV_EVENT(DBF_ERR, basedev,
2754 "prepare itcw, unknown opcode 0x%x", cmd);
2755 BUG();
2756 break;
2757 }
2758 if (rc)
2759 return rc;
2760
2761 dedata->attributes.mode = 0x3; /* ECKD */
2762
2763 heads = basepriv->rdc_data.trk_per_cyl;
2764 begcyl = trk / heads;
2765 beghead = trk % heads;
2766 endcyl = totrk / heads;
2767 endhead = totrk % heads;
2768
2769 /* check for sequential prestage - enhance cylinder range */
2770 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2771 dedata->attributes.operation == DASD_SEQ_ACCESS) {
2772
2773 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2774 endcyl += basepriv->attrib.nr_cyl;
2775 else
2776 endcyl = (basepriv->real_cyl - 1);
2777 }
2778
2779 set_ch_t(&dedata->beg_ext, begcyl, beghead);
2780 set_ch_t(&dedata->end_ext, endcyl, endhead);
2781
2782 dedata->ep_format = 0x20; /* records per track is valid */
2783 dedata->ep_rec_per_track = blk_per_trk;
2784
2785 if (rec_on_trk) {
2786 switch (basepriv->rdc_data.dev_type) {
2787 case 0x3390:
2788 dn = ceil_quot(blksize + 6, 232);
2789 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2790 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2791 break;
2792 case 0x3380:
2793 d = 7 + ceil_quot(blksize + 12, 32);
2794 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2795 break;
2796 }
2797 }
2798
2799 lredata->auxiliary.length_valid = 1;
2800 lredata->auxiliary.length_scope = 1;
2801 lredata->auxiliary.imbedded_ccw_valid = 1;
2802 lredata->length = tlf;
2803 lredata->imbedded_ccw = cmd;
2804 lredata->count = count;
2805 lredata->sector = sector;
2806 set_ch_t(&lredata->seek_addr, begcyl, beghead);
2807 lredata->search_arg.cyl = lredata->seek_addr.cyl;
2808 lredata->search_arg.head = lredata->seek_addr.head;
2809 lredata->search_arg.record = rec_on_trk;
2810
2811 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2812 &pfxdata, sizeof(pfxdata), total_data_size);
2813 return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2814 }
2815
2816 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2817 struct dasd_device *startdev,
2818 struct dasd_block *block,
2819 struct request *req,
2820 sector_t first_rec,
2821 sector_t last_rec,
2822 sector_t first_trk,
2823 sector_t last_trk,
2824 unsigned int first_offs,
2825 unsigned int last_offs,
2826 unsigned int blk_per_trk,
2827 unsigned int blksize)
2828 {
2829 struct dasd_ccw_req *cqr;
2830 struct req_iterator iter;
2831 struct bio_vec *bv;
2832 char *dst;
2833 unsigned int trkcount, ctidaw;
2834 unsigned char cmd;
2835 struct dasd_device *basedev;
2836 unsigned int tlf;
2837 struct itcw *itcw;
2838 struct tidaw *last_tidaw = NULL;
2839 int itcw_op;
2840 size_t itcw_size;
2841 u8 tidaw_flags;
2842 unsigned int seg_len, part_len, len_to_track_end;
2843 unsigned char new_track;
2844 sector_t recid, trkid;
2845 unsigned int offs;
2846 unsigned int count, count_to_trk_end;
2847 int ret;
2848
2849 basedev = block->base;
2850 if (rq_data_dir(req) == READ) {
2851 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2852 itcw_op = ITCW_OP_READ;
2853 } else if (rq_data_dir(req) == WRITE) {
2854 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2855 itcw_op = ITCW_OP_WRITE;
2856 } else
2857 return ERR_PTR(-EINVAL);
2858
2859 /* trackbased I/O needs address all memory via TIDAWs,
2860 * not just for 64 bit addresses. This allows us to map
2861 * each segment directly to one tidaw.
2862 * In the case of write requests, additional tidaws may
2863 * be needed when a segment crosses a track boundary.
2864 */
2865 trkcount = last_trk - first_trk + 1;
2866 ctidaw = 0;
2867 rq_for_each_segment(bv, req, iter) {
2868 ++ctidaw;
2869 }
2870 if (rq_data_dir(req) == WRITE)
2871 ctidaw += (last_trk - first_trk);
2872
2873 /* Allocate the ccw request. */
2874 itcw_size = itcw_calc_size(0, ctidaw, 0);
2875 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2876 if (IS_ERR(cqr))
2877 return cqr;
2878
2879 /* transfer length factor: how many bytes to read from the last track */
2880 if (first_trk == last_trk)
2881 tlf = last_offs - first_offs + 1;
2882 else
2883 tlf = last_offs + 1;
2884 tlf *= blksize;
2885
2886 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2887 if (IS_ERR(itcw)) {
2888 ret = -EINVAL;
2889 goto out_error;
2890 }
2891 cqr->cpaddr = itcw_get_tcw(itcw);
2892 if (prepare_itcw(itcw, first_trk, last_trk,
2893 cmd, basedev, startdev,
2894 first_offs + 1,
2895 trkcount, blksize,
2896 (last_rec - first_rec + 1) * blksize,
2897 tlf, blk_per_trk) == -EAGAIN) {
2898 /* Clock not in sync and XRC is enabled.
2899 * Try again later.
2900 */
2901 ret = -EAGAIN;
2902 goto out_error;
2903 }
2904 len_to_track_end = 0;
2905 /*
2906 * A tidaw can address 4k of memory, but must not cross page boundaries
2907 * We can let the block layer handle this by setting
2908 * blk_queue_segment_boundary to page boundaries and
2909 * blk_max_segment_size to page size when setting up the request queue.
2910 * For write requests, a TIDAW must not cross track boundaries, because
2911 * we have to set the CBC flag on the last tidaw for each track.
2912 */
2913 if (rq_data_dir(req) == WRITE) {
2914 new_track = 1;
2915 recid = first_rec;
2916 rq_for_each_segment(bv, req, iter) {
2917 dst = page_address(bv->bv_page) + bv->bv_offset;
2918 seg_len = bv->bv_len;
2919 while (seg_len) {
2920 if (new_track) {
2921 trkid = recid;
2922 offs = sector_div(trkid, blk_per_trk);
2923 count_to_trk_end = blk_per_trk - offs;
2924 count = min((last_rec - recid + 1),
2925 (sector_t)count_to_trk_end);
2926 len_to_track_end = count * blksize;
2927 recid += count;
2928 new_track = 0;
2929 }
2930 part_len = min(seg_len, len_to_track_end);
2931 seg_len -= part_len;
2932 len_to_track_end -= part_len;
2933 /* We need to end the tidaw at track end */
2934 if (!len_to_track_end) {
2935 new_track = 1;
2936 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2937 } else
2938 tidaw_flags = 0;
2939 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2940 dst, part_len);
2941 if (IS_ERR(last_tidaw)) {
2942 ret = -EINVAL;
2943 goto out_error;
2944 }
2945 dst += part_len;
2946 }
2947 }
2948 } else {
2949 rq_for_each_segment(bv, req, iter) {
2950 dst = page_address(bv->bv_page) + bv->bv_offset;
2951 last_tidaw = itcw_add_tidaw(itcw, 0x00,
2952 dst, bv->bv_len);
2953 if (IS_ERR(last_tidaw)) {
2954 ret = -EINVAL;
2955 goto out_error;
2956 }
2957 }
2958 }
2959 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2960 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2961 itcw_finalize(itcw);
2962
2963 if (blk_noretry_request(req) ||
2964 block->base->features & DASD_FEATURE_FAILFAST)
2965 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2966 cqr->cpmode = 1;
2967 cqr->startdev = startdev;
2968 cqr->memdev = startdev;
2969 cqr->block = block;
2970 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2971 cqr->lpm = startdev->path_data.ppm;
2972 cqr->retries = 256;
2973 cqr->buildclk = get_clock();
2974 cqr->status = DASD_CQR_FILLED;
2975 return cqr;
2976 out_error:
2977 dasd_sfree_request(cqr, startdev);
2978 return ERR_PTR(ret);
2979 }
2980
2981 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2982 struct dasd_block *block,
2983 struct request *req)
2984 {
2985 int cmdrtd, cmdwtd;
2986 int use_prefix;
2987 int fcx_multitrack;
2988 struct dasd_eckd_private *private;
2989 struct dasd_device *basedev;
2990 sector_t first_rec, last_rec;
2991 sector_t first_trk, last_trk;
2992 unsigned int first_offs, last_offs;
2993 unsigned int blk_per_trk, blksize;
2994 int cdlspecial;
2995 unsigned int data_size;
2996 struct dasd_ccw_req *cqr;
2997
2998 basedev = block->base;
2999 private = (struct dasd_eckd_private *) basedev->private;
3000
3001 /* Calculate number of blocks/records per track. */
3002 blksize = block->bp_block;
3003 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3004 if (blk_per_trk == 0)
3005 return ERR_PTR(-EINVAL);
3006 /* Calculate record id of first and last block. */
3007 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3008 first_offs = sector_div(first_trk, blk_per_trk);
3009 last_rec = last_trk =
3010 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3011 last_offs = sector_div(last_trk, blk_per_trk);
3012 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3013
3014 fcx_multitrack = private->features.feature[40] & 0x20;
3015 data_size = blk_rq_bytes(req);
3016 /* tpm write request add CBC data on each track boundary */
3017 if (rq_data_dir(req) == WRITE)
3018 data_size += (last_trk - first_trk) * 4;
3019
3020 /* is read track data and write track data in command mode supported? */
3021 cmdrtd = private->features.feature[9] & 0x20;
3022 cmdwtd = private->features.feature[12] & 0x40;
3023 use_prefix = private->features.feature[8] & 0x01;
3024
3025 cqr = NULL;
3026 if (cdlspecial || dasd_page_cache) {
3027 /* do nothing, just fall through to the cmd mode single case */
3028 } else if ((data_size <= private->fcx_max_data)
3029 && (fcx_multitrack || (first_trk == last_trk))) {
3030 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3031 first_rec, last_rec,
3032 first_trk, last_trk,
3033 first_offs, last_offs,
3034 blk_per_trk, blksize);
3035 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3036 (PTR_ERR(cqr) != -ENOMEM))
3037 cqr = NULL;
3038 } else if (use_prefix &&
3039 (((rq_data_dir(req) == READ) && cmdrtd) ||
3040 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3041 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3042 first_rec, last_rec,
3043 first_trk, last_trk,
3044 first_offs, last_offs,
3045 blk_per_trk, blksize);
3046 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3047 (PTR_ERR(cqr) != -ENOMEM))
3048 cqr = NULL;
3049 }
3050 if (!cqr)
3051 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3052 first_rec, last_rec,
3053 first_trk, last_trk,
3054 first_offs, last_offs,
3055 blk_per_trk, blksize);
3056 return cqr;
3057 }
3058
3059 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3060 struct dasd_block *block,
3061 struct request *req)
3062 {
3063 unsigned long *idaws;
3064 struct dasd_device *basedev;
3065 struct dasd_ccw_req *cqr;
3066 struct ccw1 *ccw;
3067 struct req_iterator iter;
3068 struct bio_vec *bv;
3069 char *dst;
3070 unsigned char cmd;
3071 unsigned int trkcount;
3072 unsigned int seg_len, len_to_track_end;
3073 unsigned int first_offs;
3074 unsigned int cidaw, cplength, datasize;
3075 sector_t first_trk, last_trk;
3076 unsigned int pfx_datasize;
3077
3078 /*
3079 * raw track access needs to be mutiple of 64k and on 64k boundary
3080 */
3081 if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3082 cqr = ERR_PTR(-EINVAL);
3083 goto out;
3084 }
3085 if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3086 DASD_RAW_SECTORS_PER_TRACK) != 0) {
3087 cqr = ERR_PTR(-EINVAL);
3088 goto out;
3089 }
3090
3091 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3092 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3093 DASD_RAW_SECTORS_PER_TRACK;
3094 trkcount = last_trk - first_trk + 1;
3095 first_offs = 0;
3096 basedev = block->base;
3097
3098 if (rq_data_dir(req) == READ)
3099 cmd = DASD_ECKD_CCW_READ_TRACK;
3100 else if (rq_data_dir(req) == WRITE)
3101 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3102 else {
3103 cqr = ERR_PTR(-EINVAL);
3104 goto out;
3105 }
3106
3107 /*
3108 * Raw track based I/O needs IDAWs for each page,
3109 * and not just for 64 bit addresses.
3110 */
3111 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3112
3113 /* 1x prefix + one read/write ccw per track */
3114 cplength = 1 + trkcount;
3115
3116 /*
3117 * struct PFX_eckd_data has up to 2 byte as extended parameter
3118 * this is needed for write full track and has to be mentioned
3119 * separately
3120 * add 8 instead of 2 to keep 8 byte boundary
3121 */
3122 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3123
3124 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3125
3126 /* Allocate the ccw request. */
3127 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3128 datasize, startdev);
3129 if (IS_ERR(cqr))
3130 goto out;
3131 ccw = cqr->cpaddr;
3132
3133 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3134 basedev, startdev, 1 /* format */, first_offs + 1,
3135 trkcount, 0, 0) == -EAGAIN) {
3136 /* Clock not in sync and XRC is enabled.
3137 * Try again later.
3138 */
3139 dasd_sfree_request(cqr, startdev);
3140 cqr = ERR_PTR(-EAGAIN);
3141 goto out;
3142 }
3143
3144 idaws = (unsigned long *)(cqr->data + pfx_datasize);
3145
3146 len_to_track_end = 0;
3147
3148 rq_for_each_segment(bv, req, iter) {
3149 dst = page_address(bv->bv_page) + bv->bv_offset;
3150 seg_len = bv->bv_len;
3151 if (!len_to_track_end) {
3152 ccw[-1].flags |= CCW_FLAG_CC;
3153 ccw->cmd_code = cmd;
3154 /* maximum 3390 track size */
3155 ccw->count = 57326;
3156 /* 64k map to one track */
3157 len_to_track_end = 65536;
3158 ccw->cda = (__u32)(addr_t)idaws;
3159 ccw->flags |= CCW_FLAG_IDA;
3160 ccw->flags |= CCW_FLAG_SLI;
3161 ccw++;
3162 }
3163 len_to_track_end -= seg_len;
3164 idaws = idal_create_words(idaws, dst, seg_len);
3165 }
3166
3167 if (blk_noretry_request(req) ||
3168 block->base->features & DASD_FEATURE_FAILFAST)
3169 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3170 cqr->startdev = startdev;
3171 cqr->memdev = startdev;
3172 cqr->block = block;
3173 cqr->expires = startdev->default_expires * HZ;
3174 cqr->lpm = startdev->path_data.ppm;
3175 cqr->retries = 256;
3176 cqr->buildclk = get_clock();
3177 cqr->status = DASD_CQR_FILLED;
3178
3179 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3180 cqr = NULL;
3181 out:
3182 return cqr;
3183 }
3184
3185
3186 static int
3187 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3188 {
3189 struct dasd_eckd_private *private;
3190 struct ccw1 *ccw;
3191 struct req_iterator iter;
3192 struct bio_vec *bv;
3193 char *dst, *cda;
3194 unsigned int blksize, blk_per_trk, off;
3195 sector_t recid;
3196 int status;
3197
3198 if (!dasd_page_cache)
3199 goto out;
3200 private = (struct dasd_eckd_private *) cqr->block->base->private;
3201 blksize = cqr->block->bp_block;
3202 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3203 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3204 ccw = cqr->cpaddr;
3205 /* Skip over define extent & locate record. */
3206 ccw++;
3207 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3208 ccw++;
3209 rq_for_each_segment(bv, req, iter) {
3210 dst = page_address(bv->bv_page) + bv->bv_offset;
3211 for (off = 0; off < bv->bv_len; off += blksize) {
3212 /* Skip locate record. */
3213 if (private->uses_cdl && recid <= 2*blk_per_trk)
3214 ccw++;
3215 if (dst) {
3216 if (ccw->flags & CCW_FLAG_IDA)
3217 cda = *((char **)((addr_t) ccw->cda));
3218 else
3219 cda = (char *)((addr_t) ccw->cda);
3220 if (dst != cda) {
3221 if (rq_data_dir(req) == READ)
3222 memcpy(dst, cda, bv->bv_len);
3223 kmem_cache_free(dasd_page_cache,
3224 (void *)((addr_t)cda & PAGE_MASK));
3225 }
3226 dst = NULL;
3227 }
3228 ccw++;
3229 recid++;
3230 }
3231 }
3232 out:
3233 status = cqr->status == DASD_CQR_DONE;
3234 dasd_sfree_request(cqr, cqr->memdev);
3235 return status;
3236 }
3237
3238 /*
3239 * Modify ccw/tcw in cqr so it can be started on a base device.
3240 *
3241 * Note that this is not enough to restart the cqr!
3242 * Either reset cqr->startdev as well (summary unit check handling)
3243 * or restart via separate cqr (as in ERP handling).
3244 */
3245 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3246 {
3247 struct ccw1 *ccw;
3248 struct PFX_eckd_data *pfxdata;
3249 struct tcw *tcw;
3250 struct tccb *tccb;
3251 struct dcw *dcw;
3252
3253 if (cqr->cpmode == 1) {
3254 tcw = cqr->cpaddr;
3255 tccb = tcw_get_tccb(tcw);
3256 dcw = (struct dcw *)&tccb->tca[0];
3257 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3258 pfxdata->validity.verify_base = 0;
3259 pfxdata->validity.hyper_pav = 0;
3260 } else {
3261 ccw = cqr->cpaddr;
3262 pfxdata = cqr->data;
3263 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3264 pfxdata->validity.verify_base = 0;
3265 pfxdata->validity.hyper_pav = 0;
3266 }
3267 }
3268 }
3269
3270 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3271
3272 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3273 struct dasd_block *block,
3274 struct request *req)
3275 {
3276 struct dasd_eckd_private *private;
3277 struct dasd_device *startdev;
3278 unsigned long flags;
3279 struct dasd_ccw_req *cqr;
3280
3281 startdev = dasd_alias_get_start_dev(base);
3282 if (!startdev)
3283 startdev = base;
3284 private = (struct dasd_eckd_private *) startdev->private;
3285 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3286 return ERR_PTR(-EBUSY);
3287
3288 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3289 private->count++;
3290 if ((base->features & DASD_FEATURE_USERAW))
3291 cqr = dasd_raw_build_cp(startdev, block, req);
3292 else
3293 cqr = dasd_eckd_build_cp(startdev, block, req);
3294 if (IS_ERR(cqr))
3295 private->count--;
3296 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3297 return cqr;
3298 }
3299
3300 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3301 struct request *req)
3302 {
3303 struct dasd_eckd_private *private;
3304 unsigned long flags;
3305
3306 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3307 private = (struct dasd_eckd_private *) cqr->memdev->private;
3308 private->count--;
3309 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3310 return dasd_eckd_free_cp(cqr, req);
3311 }
3312
3313 static int
3314 dasd_eckd_fill_info(struct dasd_device * device,
3315 struct dasd_information2_t * info)
3316 {
3317 struct dasd_eckd_private *private;
3318
3319 private = (struct dasd_eckd_private *) device->private;
3320 info->label_block = 2;
3321 info->FBA_layout = private->uses_cdl ? 0 : 1;
3322 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3323 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3324 memcpy(info->characteristics, &private->rdc_data,
3325 sizeof(struct dasd_eckd_characteristics));
3326 info->confdata_size = min((unsigned long)private->conf_len,
3327 sizeof(info->configuration_data));
3328 memcpy(info->configuration_data, private->conf_data,
3329 info->confdata_size);
3330 return 0;
3331 }
3332
3333 /*
3334 * SECTION: ioctl functions for eckd devices.
3335 */
3336
3337 /*
3338 * Release device ioctl.
3339 * Buils a channel programm to releases a prior reserved
3340 * (see dasd_eckd_reserve) device.
3341 */
3342 static int
3343 dasd_eckd_release(struct dasd_device *device)
3344 {
3345 struct dasd_ccw_req *cqr;
3346 int rc;
3347 struct ccw1 *ccw;
3348 int useglobal;
3349
3350 if (!capable(CAP_SYS_ADMIN))
3351 return -EACCES;
3352
3353 useglobal = 0;
3354 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3355 if (IS_ERR(cqr)) {
3356 mutex_lock(&dasd_reserve_mutex);
3357 useglobal = 1;
3358 cqr = &dasd_reserve_req->cqr;
3359 memset(cqr, 0, sizeof(*cqr));
3360 memset(&dasd_reserve_req->ccw, 0,
3361 sizeof(dasd_reserve_req->ccw));
3362 cqr->cpaddr = &dasd_reserve_req->ccw;
3363 cqr->data = &dasd_reserve_req->data;
3364 cqr->magic = DASD_ECKD_MAGIC;
3365 }
3366 ccw = cqr->cpaddr;
3367 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3368 ccw->flags |= CCW_FLAG_SLI;
3369 ccw->count = 32;
3370 ccw->cda = (__u32)(addr_t) cqr->data;
3371 cqr->startdev = device;
3372 cqr->memdev = device;
3373 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3374 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3375 cqr->retries = 2; /* set retry counter to enable basic ERP */
3376 cqr->expires = 2 * HZ;
3377 cqr->buildclk = get_clock();
3378 cqr->status = DASD_CQR_FILLED;
3379
3380 rc = dasd_sleep_on_immediatly(cqr);
3381 if (!rc)
3382 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3383
3384 if (useglobal)
3385 mutex_unlock(&dasd_reserve_mutex);
3386 else
3387 dasd_sfree_request(cqr, cqr->memdev);
3388 return rc;
3389 }
3390
3391 /*
3392 * Reserve device ioctl.
3393 * Options are set to 'synchronous wait for interrupt' and
3394 * 'timeout the request'. This leads to a terminate IO if
3395 * the interrupt is outstanding for a certain time.
3396 */
3397 static int
3398 dasd_eckd_reserve(struct dasd_device *device)
3399 {
3400 struct dasd_ccw_req *cqr;
3401 int rc;
3402 struct ccw1 *ccw;
3403 int useglobal;
3404
3405 if (!capable(CAP_SYS_ADMIN))
3406 return -EACCES;
3407
3408 useglobal = 0;
3409 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3410 if (IS_ERR(cqr)) {
3411 mutex_lock(&dasd_reserve_mutex);
3412 useglobal = 1;
3413 cqr = &dasd_reserve_req->cqr;
3414 memset(cqr, 0, sizeof(*cqr));
3415 memset(&dasd_reserve_req->ccw, 0,
3416 sizeof(dasd_reserve_req->ccw));
3417 cqr->cpaddr = &dasd_reserve_req->ccw;
3418 cqr->data = &dasd_reserve_req->data;
3419 cqr->magic = DASD_ECKD_MAGIC;
3420 }
3421 ccw = cqr->cpaddr;
3422 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3423 ccw->flags |= CCW_FLAG_SLI;
3424 ccw->count = 32;
3425 ccw->cda = (__u32)(addr_t) cqr->data;
3426 cqr->startdev = device;
3427 cqr->memdev = device;
3428 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3429 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3430 cqr->retries = 2; /* set retry counter to enable basic ERP */
3431 cqr->expires = 2 * HZ;
3432 cqr->buildclk = get_clock();
3433 cqr->status = DASD_CQR_FILLED;
3434
3435 rc = dasd_sleep_on_immediatly(cqr);
3436 if (!rc)
3437 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3438
3439 if (useglobal)
3440 mutex_unlock(&dasd_reserve_mutex);
3441 else
3442 dasd_sfree_request(cqr, cqr->memdev);
3443 return rc;
3444 }
3445
3446 /*
3447 * Steal lock ioctl - unconditional reserve device.
3448 * Buils a channel programm to break a device's reservation.
3449 * (unconditional reserve)
3450 */
3451 static int
3452 dasd_eckd_steal_lock(struct dasd_device *device)
3453 {
3454 struct dasd_ccw_req *cqr;
3455 int rc;
3456 struct ccw1 *ccw;
3457 int useglobal;
3458
3459 if (!capable(CAP_SYS_ADMIN))
3460 return -EACCES;
3461
3462 useglobal = 0;
3463 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3464 if (IS_ERR(cqr)) {
3465 mutex_lock(&dasd_reserve_mutex);
3466 useglobal = 1;
3467 cqr = &dasd_reserve_req->cqr;
3468 memset(cqr, 0, sizeof(*cqr));
3469 memset(&dasd_reserve_req->ccw, 0,
3470 sizeof(dasd_reserve_req->ccw));
3471 cqr->cpaddr = &dasd_reserve_req->ccw;
3472 cqr->data = &dasd_reserve_req->data;
3473 cqr->magic = DASD_ECKD_MAGIC;
3474 }
3475 ccw = cqr->cpaddr;
3476 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3477 ccw->flags |= CCW_FLAG_SLI;
3478 ccw->count = 32;
3479 ccw->cda = (__u32)(addr_t) cqr->data;
3480 cqr->startdev = device;
3481 cqr->memdev = device;
3482 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3483 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3484 cqr->retries = 2; /* set retry counter to enable basic ERP */
3485 cqr->expires = 2 * HZ;
3486 cqr->buildclk = get_clock();
3487 cqr->status = DASD_CQR_FILLED;
3488
3489 rc = dasd_sleep_on_immediatly(cqr);
3490 if (!rc)
3491 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3492
3493 if (useglobal)
3494 mutex_unlock(&dasd_reserve_mutex);
3495 else
3496 dasd_sfree_request(cqr, cqr->memdev);
3497 return rc;
3498 }
3499
3500 /*
3501 * SNID - Sense Path Group ID
3502 * This ioctl may be used in situations where I/O is stalled due to
3503 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3504 * preallocated dasd_reserve_req.
3505 */
3506 static int dasd_eckd_snid(struct dasd_device *device,
3507 void __user *argp)
3508 {
3509 struct dasd_ccw_req *cqr;
3510 int rc;
3511 struct ccw1 *ccw;
3512 int useglobal;
3513 struct dasd_snid_ioctl_data usrparm;
3514
3515 if (!capable(CAP_SYS_ADMIN))
3516 return -EACCES;
3517
3518 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3519 return -EFAULT;
3520
3521 useglobal = 0;
3522 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3523 sizeof(struct dasd_snid_data), device);
3524 if (IS_ERR(cqr)) {
3525 mutex_lock(&dasd_reserve_mutex);
3526 useglobal = 1;
3527 cqr = &dasd_reserve_req->cqr;
3528 memset(cqr, 0, sizeof(*cqr));
3529 memset(&dasd_reserve_req->ccw, 0,
3530 sizeof(dasd_reserve_req->ccw));
3531 cqr->cpaddr = &dasd_reserve_req->ccw;
3532 cqr->data = &dasd_reserve_req->data;
3533 cqr->magic = DASD_ECKD_MAGIC;
3534 }
3535 ccw = cqr->cpaddr;
3536 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3537 ccw->flags |= CCW_FLAG_SLI;
3538 ccw->count = 12;
3539 ccw->cda = (__u32)(addr_t) cqr->data;
3540 cqr->startdev = device;
3541 cqr->memdev = device;
3542 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3543 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3544 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3545 cqr->retries = 5;
3546 cqr->expires = 10 * HZ;
3547 cqr->buildclk = get_clock();
3548 cqr->status = DASD_CQR_FILLED;
3549 cqr->lpm = usrparm.path_mask;
3550
3551 rc = dasd_sleep_on_immediatly(cqr);
3552 /* verify that I/O processing didn't modify the path mask */
3553 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3554 rc = -EIO;
3555 if (!rc) {
3556 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3557 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3558 rc = -EFAULT;
3559 }
3560
3561 if (useglobal)
3562 mutex_unlock(&dasd_reserve_mutex);
3563 else
3564 dasd_sfree_request(cqr, cqr->memdev);
3565 return rc;
3566 }
3567
3568 /*
3569 * Read performance statistics
3570 */
3571 static int
3572 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3573 {
3574 struct dasd_psf_prssd_data *prssdp;
3575 struct dasd_rssd_perf_stats_t *stats;
3576 struct dasd_ccw_req *cqr;
3577 struct ccw1 *ccw;
3578 int rc;
3579
3580 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3581 (sizeof(struct dasd_psf_prssd_data) +
3582 sizeof(struct dasd_rssd_perf_stats_t)),
3583 device);
3584 if (IS_ERR(cqr)) {
3585 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3586 "Could not allocate initialization request");
3587 return PTR_ERR(cqr);
3588 }
3589 cqr->startdev = device;
3590 cqr->memdev = device;
3591 cqr->retries = 0;
3592 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3593 cqr->expires = 10 * HZ;
3594
3595 /* Prepare for Read Subsystem Data */
3596 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3597 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3598 prssdp->order = PSF_ORDER_PRSSD;
3599 prssdp->suborder = 0x01; /* Performance Statistics */
3600 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3601
3602 ccw = cqr->cpaddr;
3603 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3604 ccw->count = sizeof(struct dasd_psf_prssd_data);
3605 ccw->flags |= CCW_FLAG_CC;
3606 ccw->cda = (__u32)(addr_t) prssdp;
3607
3608 /* Read Subsystem Data - Performance Statistics */
3609 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3610 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3611
3612 ccw++;
3613 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3614 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3615 ccw->cda = (__u32)(addr_t) stats;
3616
3617 cqr->buildclk = get_clock();
3618 cqr->status = DASD_CQR_FILLED;
3619 rc = dasd_sleep_on(cqr);
3620 if (rc == 0) {
3621 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3622 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3623 if (copy_to_user(argp, stats,
3624 sizeof(struct dasd_rssd_perf_stats_t)))
3625 rc = -EFAULT;
3626 }
3627 dasd_sfree_request(cqr, cqr->memdev);
3628 return rc;
3629 }
3630
3631 /*
3632 * Get attributes (cache operations)
3633 * Returnes the cache attributes used in Define Extend (DE).
3634 */
3635 static int
3636 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3637 {
3638 struct dasd_eckd_private *private =
3639 (struct dasd_eckd_private *)device->private;
3640 struct attrib_data_t attrib = private->attrib;
3641 int rc;
3642
3643 if (!capable(CAP_SYS_ADMIN))
3644 return -EACCES;
3645 if (!argp)
3646 return -EINVAL;
3647
3648 rc = 0;
3649 if (copy_to_user(argp, (long *) &attrib,
3650 sizeof(struct attrib_data_t)))
3651 rc = -EFAULT;
3652
3653 return rc;
3654 }
3655
3656 /*
3657 * Set attributes (cache operations)
3658 * Stores the attributes for cache operation to be used in Define Extend (DE).
3659 */
3660 static int
3661 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3662 {
3663 struct dasd_eckd_private *private =
3664 (struct dasd_eckd_private *)device->private;
3665 struct attrib_data_t attrib;
3666
3667 if (!capable(CAP_SYS_ADMIN))
3668 return -EACCES;
3669 if (!argp)
3670 return -EINVAL;
3671
3672 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3673 return -EFAULT;
3674 private->attrib = attrib;
3675
3676 dev_info(&device->cdev->dev,
3677 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3678 private->attrib.operation, private->attrib.nr_cyl);
3679 return 0;
3680 }
3681
3682 /*
3683 * Issue syscall I/O to EMC Symmetrix array.
3684 * CCWs are PSF and RSSD
3685 */
3686 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3687 {
3688 struct dasd_symmio_parms usrparm;
3689 char *psf_data, *rssd_result;
3690 struct dasd_ccw_req *cqr;
3691 struct ccw1 *ccw;
3692 char psf0, psf1;
3693 int rc;
3694
3695 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3696 return -EACCES;
3697 psf0 = psf1 = 0;
3698
3699 /* Copy parms from caller */
3700 rc = -EFAULT;
3701 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3702 goto out;
3703 if (is_compat_task() || sizeof(long) == 4) {
3704 /* Make sure pointers are sane even on 31 bit. */
3705 rc = -EINVAL;
3706 if ((usrparm.psf_data >> 32) != 0)
3707 goto out;
3708 if ((usrparm.rssd_result >> 32) != 0)
3709 goto out;
3710 usrparm.psf_data &= 0x7fffffffULL;
3711 usrparm.rssd_result &= 0x7fffffffULL;
3712 }
3713 /* alloc I/O data area */
3714 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3715 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3716 if (!psf_data || !rssd_result) {
3717 rc = -ENOMEM;
3718 goto out_free;
3719 }
3720
3721 /* get syscall header from user space */
3722 rc = -EFAULT;
3723 if (copy_from_user(psf_data,
3724 (void __user *)(unsigned long) usrparm.psf_data,
3725 usrparm.psf_data_len))
3726 goto out_free;
3727 psf0 = psf_data[0];
3728 psf1 = psf_data[1];
3729
3730 /* setup CCWs for PSF + RSSD */
3731 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3732 if (IS_ERR(cqr)) {
3733 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3734 "Could not allocate initialization request");
3735 rc = PTR_ERR(cqr);
3736 goto out_free;
3737 }
3738
3739 cqr->startdev = device;
3740 cqr->memdev = device;
3741 cqr->retries = 3;
3742 cqr->expires = 10 * HZ;
3743 cqr->buildclk = get_clock();
3744 cqr->status = DASD_CQR_FILLED;
3745
3746 /* Build the ccws */
3747 ccw = cqr->cpaddr;
3748
3749 /* PSF ccw */
3750 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3751 ccw->count = usrparm.psf_data_len;
3752 ccw->flags |= CCW_FLAG_CC;
3753 ccw->cda = (__u32)(addr_t) psf_data;
3754
3755 ccw++;
3756
3757 /* RSSD ccw */
3758 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3759 ccw->count = usrparm.rssd_result_len;
3760 ccw->flags = CCW_FLAG_SLI ;
3761 ccw->cda = (__u32)(addr_t) rssd_result;
3762
3763 rc = dasd_sleep_on(cqr);
3764 if (rc)
3765 goto out_sfree;
3766
3767 rc = -EFAULT;
3768 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3769 rssd_result, usrparm.rssd_result_len))
3770 goto out_sfree;
3771 rc = 0;
3772
3773 out_sfree:
3774 dasd_sfree_request(cqr, cqr->memdev);
3775 out_free:
3776 kfree(rssd_result);
3777 kfree(psf_data);
3778 out:
3779 DBF_DEV_EVENT(DBF_WARNING, device,
3780 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3781 (int) psf0, (int) psf1, rc);
3782 return rc;
3783 }
3784
3785 static int
3786 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3787 {
3788 struct dasd_device *device = block->base;
3789
3790 switch (cmd) {
3791 case BIODASDGATTR:
3792 return dasd_eckd_get_attrib(device, argp);
3793 case BIODASDSATTR:
3794 return dasd_eckd_set_attrib(device, argp);
3795 case BIODASDPSRD:
3796 return dasd_eckd_performance(device, argp);
3797 case BIODASDRLSE:
3798 return dasd_eckd_release(device);
3799 case BIODASDRSRV:
3800 return dasd_eckd_reserve(device);
3801 case BIODASDSLCK:
3802 return dasd_eckd_steal_lock(device);
3803 case BIODASDSNID:
3804 return dasd_eckd_snid(device, argp);
3805 case BIODASDSYMMIO:
3806 return dasd_symm_io(device, argp);
3807 default:
3808 return -ENOIOCTLCMD;
3809 }
3810 }
3811
3812 /*
3813 * Dump the range of CCWs into 'page' buffer
3814 * and return number of printed chars.
3815 */
3816 static int
3817 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3818 {
3819 int len, count;
3820 char *datap;
3821
3822 len = 0;
3823 while (from <= to) {
3824 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3825 " CCW %p: %08X %08X DAT:",
3826 from, ((int *) from)[0], ((int *) from)[1]);
3827
3828 /* get pointer to data (consider IDALs) */
3829 if (from->flags & CCW_FLAG_IDA)
3830 datap = (char *) *((addr_t *) (addr_t) from->cda);
3831 else
3832 datap = (char *) ((addr_t) from->cda);
3833
3834 /* dump data (max 32 bytes) */
3835 for (count = 0; count < from->count && count < 32; count++) {
3836 if (count % 8 == 0) len += sprintf(page + len, " ");
3837 if (count % 4 == 0) len += sprintf(page + len, " ");
3838 len += sprintf(page + len, "%02x", datap[count]);
3839 }
3840 len += sprintf(page + len, "\n");
3841 from++;
3842 }
3843 return len;
3844 }
3845
3846 static void
3847 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3848 char *reason)
3849 {
3850 u64 *sense;
3851 u64 *stat;
3852
3853 sense = (u64 *) dasd_get_sense(irb);
3854 stat = (u64 *) &irb->scsw;
3855 if (sense) {
3856 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3857 "%016llx %016llx %016llx %016llx",
3858 reason, *stat, *((u32 *) (stat + 1)),
3859 sense[0], sense[1], sense[2], sense[3]);
3860 } else {
3861 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3862 reason, *stat, *((u32 *) (stat + 1)),
3863 "NO VALID SENSE");
3864 }
3865 }
3866
3867 /*
3868 * Print sense data and related channel program.
3869 * Parts are printed because printk buffer is only 1024 bytes.
3870 */
3871 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3872 struct dasd_ccw_req *req, struct irb *irb)
3873 {
3874 char *page;
3875 struct ccw1 *first, *last, *fail, *from, *to;
3876 int len, sl, sct;
3877
3878 page = (char *) get_zeroed_page(GFP_ATOMIC);
3879 if (page == NULL) {
3880 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3881 "No memory to dump sense data\n");
3882 return;
3883 }
3884 /* dump the sense data */
3885 len = sprintf(page, KERN_ERR PRINTK_HEADER
3886 " I/O status report for device %s:\n",
3887 dev_name(&device->cdev->dev));
3888 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3889 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3890 "CS:%02X RC:%d\n",
3891 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3892 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3893 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3894 req ? req->intrc : 0);
3895 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3896 " device %s: Failing CCW: %p\n",
3897 dev_name(&device->cdev->dev),
3898 (void *) (addr_t) irb->scsw.cmd.cpa);
3899 if (irb->esw.esw0.erw.cons) {
3900 for (sl = 0; sl < 4; sl++) {
3901 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3902 " Sense(hex) %2d-%2d:",
3903 (8 * sl), ((8 * sl) + 7));
3904
3905 for (sct = 0; sct < 8; sct++) {
3906 len += sprintf(page + len, " %02x",
3907 irb->ecw[8 * sl + sct]);
3908 }
3909 len += sprintf(page + len, "\n");
3910 }
3911
3912 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3913 /* 24 Byte Sense Data */
3914 sprintf(page + len, KERN_ERR PRINTK_HEADER
3915 " 24 Byte: %x MSG %x, "
3916 "%s MSGb to SYSOP\n",
3917 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3918 irb->ecw[1] & 0x10 ? "" : "no");
3919 } else {
3920 /* 32 Byte Sense Data */
3921 sprintf(page + len, KERN_ERR PRINTK_HEADER
3922 " 32 Byte: Format: %x "
3923 "Exception class %x\n",
3924 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3925 }
3926 } else {
3927 sprintf(page + len, KERN_ERR PRINTK_HEADER
3928 " SORRY - NO VALID SENSE AVAILABLE\n");
3929 }
3930 printk("%s", page);
3931
3932 if (req) {
3933 /* req == NULL for unsolicited interrupts */
3934 /* dump the Channel Program (max 140 Bytes per line) */
3935 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3936 first = req->cpaddr;
3937 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3938 to = min(first + 6, last);
3939 len = sprintf(page, KERN_ERR PRINTK_HEADER
3940 " Related CP in req: %p\n", req);
3941 dasd_eckd_dump_ccw_range(first, to, page + len);
3942 printk("%s", page);
3943
3944 /* print failing CCW area (maximum 4) */
3945 /* scsw->cda is either valid or zero */
3946 len = 0;
3947 from = ++to;
3948 fail = (struct ccw1 *)(addr_t)
3949 irb->scsw.cmd.cpa; /* failing CCW */
3950 if (from < fail - 2) {
3951 from = fail - 2; /* there is a gap - print header */
3952 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3953 }
3954 to = min(fail + 1, last);
3955 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3956
3957 /* print last CCWs (maximum 2) */
3958 from = max(from, ++to);
3959 if (from < last - 1) {
3960 from = last - 1; /* there is a gap - print header */
3961 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3962 }
3963 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3964 if (len > 0)
3965 printk("%s", page);
3966 }
3967 free_page((unsigned long) page);
3968 }
3969
3970
3971 /*
3972 * Print sense data from a tcw.
3973 */
3974 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3975 struct dasd_ccw_req *req, struct irb *irb)
3976 {
3977 char *page;
3978 int len, sl, sct, residual;
3979 struct tsb *tsb;
3980 u8 *sense, *rcq;
3981
3982 page = (char *) get_zeroed_page(GFP_ATOMIC);
3983 if (page == NULL) {
3984 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3985 "No memory to dump sense data");
3986 return;
3987 }
3988 /* dump the sense data */
3989 len = sprintf(page, KERN_ERR PRINTK_HEADER
3990 " I/O status report for device %s:\n",
3991 dev_name(&device->cdev->dev));
3992 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3993 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3994 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3995 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3996 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3997 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3998 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3999 req ? req->intrc : 0);
4000 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4001 " device %s: Failing TCW: %p\n",
4002 dev_name(&device->cdev->dev),
4003 (void *) (addr_t) irb->scsw.tm.tcw);
4004
4005 tsb = NULL;
4006 sense = NULL;
4007 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4008 tsb = tcw_get_tsb(
4009 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4010
4011 if (tsb) {
4012 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4013 " tsb->length %d\n", tsb->length);
4014 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4015 " tsb->flags %x\n", tsb->flags);
4016 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4017 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4018 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4019 " tsb->count %d\n", tsb->count);
4020 residual = tsb->count - 28;
4021 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4022 " residual %d\n", residual);
4023
4024 switch (tsb->flags & 0x07) {
4025 case 1: /* tsa_iostat */
4026 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4027 " tsb->tsa.iostat.dev_time %d\n",
4028 tsb->tsa.iostat.dev_time);
4029 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4030 " tsb->tsa.iostat.def_time %d\n",
4031 tsb->tsa.iostat.def_time);
4032 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4033 " tsb->tsa.iostat.queue_time %d\n",
4034 tsb->tsa.iostat.queue_time);
4035 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4036 " tsb->tsa.iostat.dev_busy_time %d\n",
4037 tsb->tsa.iostat.dev_busy_time);
4038 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4039 " tsb->tsa.iostat.dev_act_time %d\n",
4040 tsb->tsa.iostat.dev_act_time);
4041 sense = tsb->tsa.iostat.sense;
4042 break;
4043 case 2: /* ts_ddpc */
4044 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4045 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4046 for (sl = 0; sl < 2; sl++) {
4047 len += sprintf(page + len,
4048 KERN_ERR PRINTK_HEADER
4049 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4050 (8 * sl), ((8 * sl) + 7));
4051 rcq = tsb->tsa.ddpc.rcq;
4052 for (sct = 0; sct < 8; sct++) {
4053 len += sprintf(page + len, " %02x",
4054 rcq[8 * sl + sct]);
4055 }
4056 len += sprintf(page + len, "\n");
4057 }
4058 sense = tsb->tsa.ddpc.sense;
4059 break;
4060 case 3: /* tsa_intrg */
4061 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4062 " tsb->tsa.intrg.: not supportet yet \n");
4063 break;
4064 }
4065
4066 if (sense) {
4067 for (sl = 0; sl < 4; sl++) {
4068 len += sprintf(page + len,
4069 KERN_ERR PRINTK_HEADER
4070 " Sense(hex) %2d-%2d:",
4071 (8 * sl), ((8 * sl) + 7));
4072 for (sct = 0; sct < 8; sct++) {
4073 len += sprintf(page + len, " %02x",
4074 sense[8 * sl + sct]);
4075 }
4076 len += sprintf(page + len, "\n");
4077 }
4078
4079 if (sense[27] & DASD_SENSE_BIT_0) {
4080 /* 24 Byte Sense Data */
4081 sprintf(page + len, KERN_ERR PRINTK_HEADER
4082 " 24 Byte: %x MSG %x, "
4083 "%s MSGb to SYSOP\n",
4084 sense[7] >> 4, sense[7] & 0x0f,
4085 sense[1] & 0x10 ? "" : "no");
4086 } else {
4087 /* 32 Byte Sense Data */
4088 sprintf(page + len, KERN_ERR PRINTK_HEADER
4089 " 32 Byte: Format: %x "
4090 "Exception class %x\n",
4091 sense[6] & 0x0f, sense[22] >> 4);
4092 }
4093 } else {
4094 sprintf(page + len, KERN_ERR PRINTK_HEADER
4095 " SORRY - NO VALID SENSE AVAILABLE\n");
4096 }
4097 } else {
4098 sprintf(page + len, KERN_ERR PRINTK_HEADER
4099 " SORRY - NO TSB DATA AVAILABLE\n");
4100 }
4101 printk("%s", page);
4102 free_page((unsigned long) page);
4103 }
4104
4105 static void dasd_eckd_dump_sense(struct dasd_device *device,
4106 struct dasd_ccw_req *req, struct irb *irb)
4107 {
4108 if (scsw_is_tm(&irb->scsw))
4109 dasd_eckd_dump_sense_tcw(device, req, irb);
4110 else
4111 dasd_eckd_dump_sense_ccw(device, req, irb);
4112 }
4113
4114 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4115 {
4116 /*
4117 * the device should be disconnected from our LCU structure
4118 * on restore we will reconnect it and reread LCU specific
4119 * information like PAV support that might have changed
4120 */
4121 dasd_alias_remove_device(device);
4122 dasd_alias_disconnect_device_from_lcu(device);
4123
4124 return 0;
4125 }
4126
4127 static int dasd_eckd_restore_device(struct dasd_device *device)
4128 {
4129 struct dasd_eckd_private *private;
4130 struct dasd_eckd_characteristics temp_rdc_data;
4131 int rc;
4132 struct dasd_uid temp_uid;
4133 unsigned long flags;
4134
4135 private = (struct dasd_eckd_private *) device->private;
4136
4137 /* Read Configuration Data */
4138 rc = dasd_eckd_read_conf(device);
4139 if (rc)
4140 goto out_err;
4141
4142 dasd_eckd_get_uid(device, &temp_uid);
4143 /* Generate device unique id */
4144 rc = dasd_eckd_generate_uid(device);
4145 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4146 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4147 dev_err(&device->cdev->dev, "The UID of the DASD has "
4148 "changed\n");
4149 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4150 if (rc)
4151 goto out_err;
4152
4153 /* register lcu with alias handling, enable PAV if this is a new lcu */
4154 rc = dasd_alias_make_device_known_to_lcu(device);
4155 if (rc)
4156 return rc;
4157 dasd_eckd_validate_server(device);
4158
4159 /* RE-Read Configuration Data */
4160 rc = dasd_eckd_read_conf(device);
4161 if (rc)
4162 goto out_err;
4163
4164 /* Read Feature Codes */
4165 dasd_eckd_read_features(device);
4166
4167 /* Read Device Characteristics */
4168 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4169 &temp_rdc_data, 64);
4170 if (rc) {
4171 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4172 "Read device characteristic failed, rc=%d", rc);
4173 goto out_err;
4174 }
4175 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4176 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4177 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4178
4179 /* add device to alias management */
4180 dasd_alias_add_device(device);
4181
4182 return 0;
4183
4184 out_err:
4185 return -1;
4186 }
4187
4188 static int dasd_eckd_reload_device(struct dasd_device *device)
4189 {
4190 struct dasd_eckd_private *private;
4191 int rc, old_base;
4192 char print_uid[60];
4193 struct dasd_uid uid;
4194 unsigned long flags;
4195
4196 private = (struct dasd_eckd_private *) device->private;
4197
4198 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4199 old_base = private->uid.base_unit_addr;
4200 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4201
4202 /* Read Configuration Data */
4203 rc = dasd_eckd_read_conf(device);
4204 if (rc)
4205 goto out_err;
4206
4207 rc = dasd_eckd_generate_uid(device);
4208 if (rc)
4209 goto out_err;
4210 /*
4211 * update unit address configuration and
4212 * add device to alias management
4213 */
4214 dasd_alias_update_add_device(device);
4215
4216 dasd_eckd_get_uid(device, &uid);
4217
4218 if (old_base != uid.base_unit_addr) {
4219 if (strlen(uid.vduit) > 0)
4220 snprintf(print_uid, sizeof(print_uid),
4221 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4222 uid.ssid, uid.base_unit_addr, uid.vduit);
4223 else
4224 snprintf(print_uid, sizeof(print_uid),
4225 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4226 uid.ssid, uid.base_unit_addr);
4227
4228 dev_info(&device->cdev->dev,
4229 "An Alias device was reassigned to a new base device "
4230 "with UID: %s\n", print_uid);
4231 }
4232 return 0;
4233
4234 out_err:
4235 return -1;
4236 }
4237
4238 static struct ccw_driver dasd_eckd_driver = {
4239 .driver = {
4240 .name = "dasd-eckd",
4241 .owner = THIS_MODULE,
4242 },
4243 .ids = dasd_eckd_ids,
4244 .probe = dasd_eckd_probe,
4245 .remove = dasd_generic_remove,
4246 .set_offline = dasd_generic_set_offline,
4247 .set_online = dasd_eckd_set_online,
4248 .notify = dasd_generic_notify,
4249 .path_event = dasd_generic_path_event,
4250 .freeze = dasd_generic_pm_freeze,
4251 .thaw = dasd_generic_restore_device,
4252 .restore = dasd_generic_restore_device,
4253 .uc_handler = dasd_generic_uc_handler,
4254 .int_class = IOINT_DAS,
4255 };
4256
4257 /*
4258 * max_blocks is dependent on the amount of storage that is available
4259 * in the static io buffer for each device. Currently each device has
4260 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4261 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4262 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4263 * addition we have one define extent ccw + 16 bytes of data and one
4264 * locate record ccw + 16 bytes of data. That makes:
4265 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4266 * We want to fit two into the available memory so that we can immediately
4267 * start the next request if one finishes off. That makes 249.5 blocks
4268 * for one request. Give a little safety and the result is 240.
4269 */
4270 static struct dasd_discipline dasd_eckd_discipline = {
4271 .owner = THIS_MODULE,
4272 .name = "ECKD",
4273 .ebcname = "ECKD",
4274 .max_blocks = 190,
4275 .check_device = dasd_eckd_check_characteristics,
4276 .uncheck_device = dasd_eckd_uncheck_device,
4277 .do_analysis = dasd_eckd_do_analysis,
4278 .verify_path = dasd_eckd_verify_path,
4279 .ready_to_online = dasd_eckd_ready_to_online,
4280 .online_to_ready = dasd_eckd_online_to_ready,
4281 .fill_geometry = dasd_eckd_fill_geometry,
4282 .start_IO = dasd_start_IO,
4283 .term_IO = dasd_term_IO,
4284 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4285 .format_device = dasd_eckd_format_device,
4286 .erp_action = dasd_eckd_erp_action,
4287 .erp_postaction = dasd_eckd_erp_postaction,
4288 .check_for_device_change = dasd_eckd_check_for_device_change,
4289 .build_cp = dasd_eckd_build_alias_cp,
4290 .free_cp = dasd_eckd_free_alias_cp,
4291 .dump_sense = dasd_eckd_dump_sense,
4292 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4293 .fill_info = dasd_eckd_fill_info,
4294 .ioctl = dasd_eckd_ioctl,
4295 .freeze = dasd_eckd_pm_freeze,
4296 .restore = dasd_eckd_restore_device,
4297 .reload = dasd_eckd_reload_device,
4298 .get_uid = dasd_eckd_get_uid,
4299 .kick_validate = dasd_eckd_kick_validate_server,
4300 };
4301
4302 static int __init
4303 dasd_eckd_init(void)
4304 {
4305 int ret;
4306
4307 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4308 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4309 GFP_KERNEL | GFP_DMA);
4310 if (!dasd_reserve_req)
4311 return -ENOMEM;
4312 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4313 GFP_KERNEL | GFP_DMA);
4314 if (!path_verification_worker) {
4315 kfree(dasd_reserve_req);
4316 return -ENOMEM;
4317 }
4318 ret = ccw_driver_register(&dasd_eckd_driver);
4319 if (!ret)
4320 wait_for_device_probe();
4321 else {
4322 kfree(path_verification_worker);
4323 kfree(dasd_reserve_req);
4324 }
4325 return ret;
4326 }
4327
4328 static void __exit
4329 dasd_eckd_cleanup(void)
4330 {
4331 ccw_driver_unregister(&dasd_eckd_driver);
4332 kfree(path_verification_worker);
4333 kfree(dasd_reserve_req);
4334 }
4335
4336 module_init(dasd_eckd_init);
4337 module_exit(dasd_eckd_cleanup);
Linux with added FPC-III support