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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / s390 / block / dasd_fba.c
blob4b71b116486838daea8132a832fcaa200f720016
1 /*
2 * File...........: linux/drivers/s390/block/dasd_fba.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * Copyright IBM Corp. 1999, 2009
6 */
7
8 #define KMSG_COMPONENT "dasd-fba"
9
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <asm/debug.h>
13
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19
20 #include <asm/idals.h>
21 #include <asm/ebcdic.h>
22 #include <asm/io.h>
23 #include <asm/ccwdev.h>
24
25 #include "dasd_int.h"
26 #include "dasd_fba.h"
27
28 #ifdef PRINTK_HEADER
29 #undef PRINTK_HEADER
30 #endif /* PRINTK_HEADER */
31 #define PRINTK_HEADER "dasd(fba):"
32
33 #define DASD_FBA_CCW_WRITE 0x41
34 #define DASD_FBA_CCW_READ 0x42
35 #define DASD_FBA_CCW_LOCATE 0x43
36 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
37
38 MODULE_LICENSE("GPL");
39
40 static struct dasd_discipline dasd_fba_discipline;
41
42 struct dasd_fba_private {
43 struct dasd_fba_characteristics rdc_data;
44 };
45
46 static struct ccw_device_id dasd_fba_ids[] = {
47 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
48 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
49 { /* end of list */ },
50 };
51
52 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
53
54 static struct ccw_driver dasd_fba_driver; /* see below */
55 static int
56 dasd_fba_probe(struct ccw_device *cdev)
57 {
58 return dasd_generic_probe(cdev, &dasd_fba_discipline);
59 }
60
61 static int
62 dasd_fba_set_online(struct ccw_device *cdev)
63 {
64 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
65 }
66
67 static struct ccw_driver dasd_fba_driver = {
68 .driver = {
69 .name = "dasd-fba",
70 .owner = THIS_MODULE,
71 },
72 .ids = dasd_fba_ids,
73 .probe = dasd_fba_probe,
74 .remove = dasd_generic_remove,
75 .set_offline = dasd_generic_set_offline,
76 .set_online = dasd_fba_set_online,
77 .notify = dasd_generic_notify,
78 .path_event = dasd_generic_path_event,
79 .freeze = dasd_generic_pm_freeze,
80 .thaw = dasd_generic_restore_device,
81 .restore = dasd_generic_restore_device,
82 };
83
84 static void
85 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
86 int blksize, int beg, int nr)
87 {
88 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
89 ccw->flags = 0;
90 ccw->count = 16;
91 ccw->cda = (__u32) __pa(data);
92 memset(data, 0, sizeof (struct DE_fba_data));
93 if (rw == WRITE)
94 (data->mask).perm = 0x0;
95 else if (rw == READ)
96 (data->mask).perm = 0x1;
97 else
98 data->mask.perm = 0x2;
99 data->blk_size = blksize;
100 data->ext_loc = beg;
101 data->ext_end = nr - 1;
102 }
103
104 static void
105 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
106 int block_nr, int block_ct)
107 {
108 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
109 ccw->flags = 0;
110 ccw->count = 8;
111 ccw->cda = (__u32) __pa(data);
112 memset(data, 0, sizeof (struct LO_fba_data));
113 if (rw == WRITE)
114 data->operation.cmd = 0x5;
115 else if (rw == READ)
116 data->operation.cmd = 0x6;
117 else
118 data->operation.cmd = 0x8;
119 data->blk_nr = block_nr;
120 data->blk_ct = block_ct;
121 }
122
123 static int
124 dasd_fba_check_characteristics(struct dasd_device *device)
125 {
126 struct dasd_block *block;
127 struct dasd_fba_private *private;
128 struct ccw_device *cdev = device->cdev;
129 int rc;
130 int readonly;
131
132 private = (struct dasd_fba_private *) device->private;
133 if (!private) {
134 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
135 if (!private) {
136 dev_warn(&device->cdev->dev,
137 "Allocating memory for private DASD "
138 "data failed\n");
139 return -ENOMEM;
140 }
141 device->private = (void *) private;
142 } else {
143 memset(private, 0, sizeof(*private));
144 }
145 block = dasd_alloc_block();
146 if (IS_ERR(block)) {
147 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
148 "dasd block structure");
149 device->private = NULL;
150 kfree(private);
151 return PTR_ERR(block);
152 }
153 device->block = block;
154 block->base = device;
155
156 /* Read Device Characteristics */
157 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
158 &private->rdc_data, 32);
159 if (rc) {
160 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
161 "characteristics returned error %d", rc);
162 device->block = NULL;
163 dasd_free_block(block);
164 device->private = NULL;
165 kfree(private);
166 return rc;
167 }
168
169 device->default_expires = DASD_EXPIRES;
170 device->path_data.opm = LPM_ANYPATH;
171
172 readonly = dasd_device_is_ro(device);
173 if (readonly)
174 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
175
176 dev_info(&device->cdev->dev,
177 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
178 "and %d B/blk%s\n",
179 cdev->id.dev_type,
180 cdev->id.dev_model,
181 cdev->id.cu_type,
182 cdev->id.cu_model,
183 ((private->rdc_data.blk_bdsa *
184 (private->rdc_data.blk_size >> 9)) >> 11),
185 private->rdc_data.blk_size,
186 readonly ? ", read-only device" : "");
187 return 0;
188 }
189
190 static int dasd_fba_do_analysis(struct dasd_block *block)
191 {
192 struct dasd_fba_private *private;
193 int sb, rc;
194
195 private = (struct dasd_fba_private *) block->base->private;
196 rc = dasd_check_blocksize(private->rdc_data.blk_size);
197 if (rc) {
198 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
199 private->rdc_data.blk_size);
200 return rc;
201 }
202 block->blocks = private->rdc_data.blk_bdsa;
203 block->bp_block = private->rdc_data.blk_size;
204 block->s2b_shift = 0; /* bits to shift 512 to get a block */
205 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
206 block->s2b_shift++;
207 return 0;
208 }
209
210 static int dasd_fba_fill_geometry(struct dasd_block *block,
211 struct hd_geometry *geo)
212 {
213 if (dasd_check_blocksize(block->bp_block) != 0)
214 return -EINVAL;
215 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
216 geo->heads = 16;
217 geo->sectors = 128 >> block->s2b_shift;
218 return 0;
219 }
220
221 static dasd_erp_fn_t
222 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
223 {
224 return dasd_default_erp_action;
225 }
226
227 static dasd_erp_fn_t
228 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
229 {
230 if (cqr->function == dasd_default_erp_action)
231 return dasd_default_erp_postaction;
232
233 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
234 cqr->function);
235 return NULL;
236 }
237
238 static void dasd_fba_check_for_device_change(struct dasd_device *device,
239 struct dasd_ccw_req *cqr,
240 struct irb *irb)
241 {
242 char mask;
243
244 /* first of all check for state change pending interrupt */
245 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
246 if ((irb->scsw.cmd.dstat & mask) == mask)
247 dasd_generic_handle_state_change(device);
248 };
249
250 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
251 struct dasd_block *block,
252 struct request *req)
253 {
254 struct dasd_fba_private *private;
255 unsigned long *idaws;
256 struct LO_fba_data *LO_data;
257 struct dasd_ccw_req *cqr;
258 struct ccw1 *ccw;
259 struct req_iterator iter;
260 struct bio_vec *bv;
261 char *dst;
262 int count, cidaw, cplength, datasize;
263 sector_t recid, first_rec, last_rec;
264 unsigned int blksize, off;
265 unsigned char cmd;
266
267 private = (struct dasd_fba_private *) block->base->private;
268 if (rq_data_dir(req) == READ) {
269 cmd = DASD_FBA_CCW_READ;
270 } else if (rq_data_dir(req) == WRITE) {
271 cmd = DASD_FBA_CCW_WRITE;
272 } else
273 return ERR_PTR(-EINVAL);
274 blksize = block->bp_block;
275 /* Calculate record id of first and last block. */
276 first_rec = blk_rq_pos(req) >> block->s2b_shift;
277 last_rec =
278 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
279 /* Check struct bio and count the number of blocks for the request. */
280 count = 0;
281 cidaw = 0;
282 rq_for_each_segment(bv, req, iter) {
283 if (bv->bv_len & (blksize - 1))
284 /* Fba can only do full blocks. */
285 return ERR_PTR(-EINVAL);
286 count += bv->bv_len >> (block->s2b_shift + 9);
287 #if defined(CONFIG_64BIT)
288 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
289 cidaw += bv->bv_len / blksize;
290 #endif
291 }
292 /* Paranoia. */
293 if (count != last_rec - first_rec + 1)
294 return ERR_PTR(-EINVAL);
295 /* 1x define extent + 1x locate record + number of blocks */
296 cplength = 2 + count;
297 /* 1x define extent + 1x locate record */
298 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
299 cidaw * sizeof(unsigned long);
300 /*
301 * Find out number of additional locate record ccws if the device
302 * can't do data chaining.
303 */
304 if (private->rdc_data.mode.bits.data_chain == 0) {
305 cplength += count - 1;
306 datasize += (count - 1)*sizeof(struct LO_fba_data);
307 }
308 /* Allocate the ccw request. */
309 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
310 if (IS_ERR(cqr))
311 return cqr;
312 ccw = cqr->cpaddr;
313 /* First ccw is define extent. */
314 define_extent(ccw++, cqr->data, rq_data_dir(req),
315 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
316 /* Build locate_record + read/write ccws. */
317 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
318 LO_data = (struct LO_fba_data *) (idaws + cidaw);
319 /* Locate record for all blocks for smart devices. */
320 if (private->rdc_data.mode.bits.data_chain != 0) {
321 ccw[-1].flags |= CCW_FLAG_CC;
322 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
323 }
324 recid = first_rec;
325 rq_for_each_segment(bv, req, iter) {
326 dst = page_address(bv->bv_page) + bv->bv_offset;
327 if (dasd_page_cache) {
328 char *copy = kmem_cache_alloc(dasd_page_cache,
329 GFP_DMA | __GFP_NOWARN);
330 if (copy && rq_data_dir(req) == WRITE)
331 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
332 if (copy)
333 dst = copy + bv->bv_offset;
334 }
335 for (off = 0; off < bv->bv_len; off += blksize) {
336 /* Locate record for stupid devices. */
337 if (private->rdc_data.mode.bits.data_chain == 0) {
338 ccw[-1].flags |= CCW_FLAG_CC;
339 locate_record(ccw, LO_data++,
340 rq_data_dir(req),
341 recid - first_rec, 1);
342 ccw->flags = CCW_FLAG_CC;
343 ccw++;
344 } else {
345 if (recid > first_rec)
346 ccw[-1].flags |= CCW_FLAG_DC;
347 else
348 ccw[-1].flags |= CCW_FLAG_CC;
349 }
350 ccw->cmd_code = cmd;
351 ccw->count = block->bp_block;
352 if (idal_is_needed(dst, blksize)) {
353 ccw->cda = (__u32)(addr_t) idaws;
354 ccw->flags = CCW_FLAG_IDA;
355 idaws = idal_create_words(idaws, dst, blksize);
356 } else {
357 ccw->cda = (__u32)(addr_t) dst;
358 ccw->flags = 0;
359 }
360 ccw++;
361 dst += blksize;
362 recid++;
363 }
364 }
365 if (blk_noretry_request(req) ||
366 block->base->features & DASD_FEATURE_FAILFAST)
367 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
368 cqr->startdev = memdev;
369 cqr->memdev = memdev;
370 cqr->block = block;
371 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
372 cqr->retries = 32;
373 cqr->buildclk = get_clock();
374 cqr->status = DASD_CQR_FILLED;
375 return cqr;
376 }
377
378 static int
379 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
380 {
381 struct dasd_fba_private *private;
382 struct ccw1 *ccw;
383 struct req_iterator iter;
384 struct bio_vec *bv;
385 char *dst, *cda;
386 unsigned int blksize, off;
387 int status;
388
389 if (!dasd_page_cache)
390 goto out;
391 private = (struct dasd_fba_private *) cqr->block->base->private;
392 blksize = cqr->block->bp_block;
393 ccw = cqr->cpaddr;
394 /* Skip over define extent & locate record. */
395 ccw++;
396 if (private->rdc_data.mode.bits.data_chain != 0)
397 ccw++;
398 rq_for_each_segment(bv, req, iter) {
399 dst = page_address(bv->bv_page) + bv->bv_offset;
400 for (off = 0; off < bv->bv_len; off += blksize) {
401 /* Skip locate record. */
402 if (private->rdc_data.mode.bits.data_chain == 0)
403 ccw++;
404 if (dst) {
405 if (ccw->flags & CCW_FLAG_IDA)
406 cda = *((char **)((addr_t) ccw->cda));
407 else
408 cda = (char *)((addr_t) ccw->cda);
409 if (dst != cda) {
410 if (rq_data_dir(req) == READ)
411 memcpy(dst, cda, bv->bv_len);
412 kmem_cache_free(dasd_page_cache,
413 (void *)((addr_t)cda & PAGE_MASK));
414 }
415 dst = NULL;
416 }
417 ccw++;
418 }
419 }
420 out:
421 status = cqr->status == DASD_CQR_DONE;
422 dasd_sfree_request(cqr, cqr->memdev);
423 return status;
424 }
425
426 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
427 {
428 cqr->status = DASD_CQR_FILLED;
429 };
430
431 static int
432 dasd_fba_fill_info(struct dasd_device * device,
433 struct dasd_information2_t * info)
434 {
435 info->label_block = 1;
436 info->FBA_layout = 1;
437 info->format = DASD_FORMAT_LDL;
438 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
439 memcpy(info->characteristics,
440 &((struct dasd_fba_private *) device->private)->rdc_data,
441 sizeof (struct dasd_fba_characteristics));
442 info->confdata_size = 0;
443 return 0;
444 }
445
446 static void
447 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
448 char *reason)
449 {
450 u64 *sense;
451
452 sense = (u64 *) dasd_get_sense(irb);
453 if (sense) {
454 DBF_DEV_EVENT(DBF_EMERG, device,
455 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
456 "%016llx", reason,
457 scsw_is_tm(&irb->scsw) ? "t" : "c",
458 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
459 scsw_dstat(&irb->scsw), sense[0], sense[1],
460 sense[2], sense[3]);
461 } else {
462 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
463 "SORRY - NO VALID SENSE AVAILABLE\n");
464 }
465 }
466
467
468 static void
469 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
470 struct irb *irb)
471 {
472 char *page;
473 struct ccw1 *act, *end, *last;
474 int len, sl, sct, count;
475
476 page = (char *) get_zeroed_page(GFP_ATOMIC);
477 if (page == NULL) {
478 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
479 "No memory to dump sense data");
480 return;
481 }
482 len = sprintf(page, KERN_ERR PRINTK_HEADER
483 " I/O status report for device %s:\n",
484 dev_name(&device->cdev->dev));
485 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
486 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
487 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
488 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
489 " device %s: Failing CCW: %p\n",
490 dev_name(&device->cdev->dev),
491 (void *) (addr_t) irb->scsw.cmd.cpa);
492 if (irb->esw.esw0.erw.cons) {
493 for (sl = 0; sl < 4; sl++) {
494 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
495 " Sense(hex) %2d-%2d:",
496 (8 * sl), ((8 * sl) + 7));
497
498 for (sct = 0; sct < 8; sct++) {
499 len += sprintf(page + len, " %02x",
500 irb->ecw[8 * sl + sct]);
501 }
502 len += sprintf(page + len, "\n");
503 }
504 } else {
505 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
506 " SORRY - NO VALID SENSE AVAILABLE\n");
507 }
508 printk(KERN_ERR "%s", page);
509
510 /* dump the Channel Program */
511 /* print first CCWs (maximum 8) */
512 act = req->cpaddr;
513 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
514 end = min(act + 8, last);
515 len = sprintf(page, KERN_ERR PRINTK_HEADER
516 " Related CP in req: %p\n", req);
517 while (act <= end) {
518 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
519 " CCW %p: %08X %08X DAT:",
520 act, ((int *) act)[0], ((int *) act)[1]);
521 for (count = 0; count < 32 && count < act->count;
522 count += sizeof(int))
523 len += sprintf(page + len, " %08X",
524 ((int *) (addr_t) act->cda)
525 [(count>>2)]);
526 len += sprintf(page + len, "\n");
527 act++;
528 }
529 printk(KERN_ERR "%s", page);
530
531
532 /* print failing CCW area */
533 len = 0;
534 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
535 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
536 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
537 }
538 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
539 while (act <= end) {
540 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
541 " CCW %p: %08X %08X DAT:",
542 act, ((int *) act)[0], ((int *) act)[1]);
543 for (count = 0; count < 32 && count < act->count;
544 count += sizeof(int))
545 len += sprintf(page + len, " %08X",
546 ((int *) (addr_t) act->cda)
547 [(count>>2)]);
548 len += sprintf(page + len, "\n");
549 act++;
550 }
551
552 /* print last CCWs */
553 if (act < last - 2) {
554 act = last - 2;
555 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
556 }
557 while (act <= last) {
558 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
559 " CCW %p: %08X %08X DAT:",
560 act, ((int *) act)[0], ((int *) act)[1]);
561 for (count = 0; count < 32 && count < act->count;
562 count += sizeof(int))
563 len += sprintf(page + len, " %08X",
564 ((int *) (addr_t) act->cda)
565 [(count>>2)]);
566 len += sprintf(page + len, "\n");
567 act++;
568 }
569 if (len > 0)
570 printk(KERN_ERR "%s", page);
571 free_page((unsigned long) page);
572 }
573
574 /*
575 * max_blocks is dependent on the amount of storage that is available
576 * in the static io buffer for each device. Currently each device has
577 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
578 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
579 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
580 * addition we have one define extent ccw + 16 bytes of data and a
581 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
582 * That makes:
583 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
584 * We want to fit two into the available memory so that we can immediately
585 * start the next request if one finishes off. That makes 100.1 blocks
586 * for one request. Give a little safety and the result is 96.
587 */
588 static struct dasd_discipline dasd_fba_discipline = {
589 .owner = THIS_MODULE,
590 .name = "FBA ",
591 .ebcname = "FBA ",
592 .max_blocks = 96,
593 .check_device = dasd_fba_check_characteristics,
594 .do_analysis = dasd_fba_do_analysis,
595 .verify_path = dasd_generic_verify_path,
596 .fill_geometry = dasd_fba_fill_geometry,
597 .start_IO = dasd_start_IO,
598 .term_IO = dasd_term_IO,
599 .handle_terminated_request = dasd_fba_handle_terminated_request,
600 .erp_action = dasd_fba_erp_action,
601 .erp_postaction = dasd_fba_erp_postaction,
602 .check_for_device_change = dasd_fba_check_for_device_change,
603 .build_cp = dasd_fba_build_cp,
604 .free_cp = dasd_fba_free_cp,
605 .dump_sense = dasd_fba_dump_sense,
606 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
607 .fill_info = dasd_fba_fill_info,
608 };
609
610 static int __init
611 dasd_fba_init(void)
612 {
613 int ret;
614
615 ASCEBC(dasd_fba_discipline.ebcname, 4);
616 ret = ccw_driver_register(&dasd_fba_driver);
617 if (!ret)
618 wait_for_device_probe();
619
620 return ret;
621 }
622
623 static void __exit
624 dasd_fba_cleanup(void)
625 {
626 ccw_driver_unregister(&dasd_fba_driver);
627 }
628
629 module_init(dasd_fba_init);
630 module_exit(dasd_fba_cleanup);
linux-next