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6
7#define KMSG_COMPONENT "dasd-fba"
8
9#include <linux/stddef.h>
10#include <linux/kernel.h>
11#include <asm/debug.h>
12
13#include <linux/slab.h>
14#include <linux/hdreg.h>
15#include <linux/bio.h>
16#include <linux/module.h>
17#include <linux/init.h>
18
19#include <asm/idals.h>
20#include <asm/ebcdic.h>
21#include <asm/io.h>
22#include <asm/ccwdev.h>
23
24#include "dasd_int.h"
25#include "dasd_fba.h"
26
27#ifdef PRINTK_HEADER
28#undef PRINTK_HEADER
29#endif
30#define PRINTK_HEADER "dasd(fba):"
31
32#define FBA_DEFAULT_RETRIES 32
33
34#define DASD_FBA_CCW_WRITE 0x41
35#define DASD_FBA_CCW_READ 0x42
36#define DASD_FBA_CCW_LOCATE 0x43
37#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
38
39MODULE_LICENSE("GPL");
40
41static struct dasd_discipline dasd_fba_discipline;
42
43struct dasd_fba_private {
44 struct dasd_fba_characteristics rdc_data;
45};
46
47static struct ccw_device_id dasd_fba_ids[] = {
48 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
49 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
50 { },
51};
52
53MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
54
55static struct ccw_driver dasd_fba_driver;
56static int
57dasd_fba_probe(struct ccw_device *cdev)
58{
59 return dasd_generic_probe(cdev, &dasd_fba_discipline);
60}
61
62static int
63dasd_fba_set_online(struct ccw_device *cdev)
64{
65 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
66}
67
68static struct ccw_driver dasd_fba_driver = {
69 .driver = {
70 .name = "dasd-fba",
71 .owner = THIS_MODULE,
72 },
73 .ids = dasd_fba_ids,
74 .probe = dasd_fba_probe,
75 .remove = dasd_generic_remove,
76 .set_offline = dasd_generic_set_offline,
77 .set_online = dasd_fba_set_online,
78 .notify = dasd_generic_notify,
79 .path_event = dasd_generic_path_event,
80 .freeze = dasd_generic_pm_freeze,
81 .thaw = dasd_generic_restore_device,
82 .restore = dasd_generic_restore_device,
83 .int_class = IRQIO_DAS,
84};
85
86static void
87define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
88 int blksize, int beg, int nr)
89{
90 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
91 ccw->flags = 0;
92 ccw->count = 16;
93 ccw->cda = (__u32) __pa(data);
94 memset(data, 0, sizeof (struct DE_fba_data));
95 if (rw == WRITE)
96 (data->mask).perm = 0x0;
97 else if (rw == READ)
98 (data->mask).perm = 0x1;
99 else
100 data->mask.perm = 0x2;
101 data->blk_size = blksize;
102 data->ext_loc = beg;
103 data->ext_end = nr - 1;
104}
105
106static void
107locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
108 int block_nr, int block_ct)
109{
110 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
111 ccw->flags = 0;
112 ccw->count = 8;
113 ccw->cda = (__u32) __pa(data);
114 memset(data, 0, sizeof (struct LO_fba_data));
115 if (rw == WRITE)
116 data->operation.cmd = 0x5;
117 else if (rw == READ)
118 data->operation.cmd = 0x6;
119 else
120 data->operation.cmd = 0x8;
121 data->blk_nr = block_nr;
122 data->blk_ct = block_ct;
123}
124
125static int
126dasd_fba_check_characteristics(struct dasd_device *device)
127{
128 struct dasd_block *block;
129 struct dasd_fba_private *private;
130 struct ccw_device *cdev = device->cdev;
131 int rc;
132 int readonly;
133
134 private = (struct dasd_fba_private *) device->private;
135 if (!private) {
136 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
137 if (!private) {
138 dev_warn(&device->cdev->dev,
139 "Allocating memory for private DASD "
140 "data failed\n");
141 return -ENOMEM;
142 }
143 device->private = (void *) private;
144 } else {
145 memset(private, 0, sizeof(*private));
146 }
147 block = dasd_alloc_block();
148 if (IS_ERR(block)) {
149 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
150 "dasd block structure");
151 device->private = NULL;
152 kfree(private);
153 return PTR_ERR(block);
154 }
155 device->block = block;
156 block->base = device;
157
158
159 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
160 &private->rdc_data, 32);
161 if (rc) {
162 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
163 "characteristics returned error %d", rc);
164 device->block = NULL;
165 dasd_free_block(block);
166 device->private = NULL;
167 kfree(private);
168 return rc;
169 }
170
171 device->default_expires = DASD_EXPIRES;
172 device->default_retries = FBA_DEFAULT_RETRIES;
173 device->path_data.opm = LPM_ANYPATH;
174
175 readonly = dasd_device_is_ro(device);
176 if (readonly)
177 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
178
179 dev_info(&device->cdev->dev,
180 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
181 "and %d B/blk%s\n",
182 cdev->id.dev_type,
183 cdev->id.dev_model,
184 cdev->id.cu_type,
185 cdev->id.cu_model,
186 ((private->rdc_data.blk_bdsa *
187 (private->rdc_data.blk_size >> 9)) >> 11),
188 private->rdc_data.blk_size,
189 readonly ? ", read-only device" : "");
190 return 0;
191}
192
193static int dasd_fba_do_analysis(struct dasd_block *block)
194{
195 struct dasd_fba_private *private;
196 int sb, rc;
197
198 private = (struct dasd_fba_private *) block->base->private;
199 rc = dasd_check_blocksize(private->rdc_data.blk_size);
200 if (rc) {
201 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
202 private->rdc_data.blk_size);
203 return rc;
204 }
205 block->blocks = private->rdc_data.blk_bdsa;
206 block->bp_block = private->rdc_data.blk_size;
207 block->s2b_shift = 0;
208 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
209 block->s2b_shift++;
210 return 0;
211}
212
213static int dasd_fba_fill_geometry(struct dasd_block *block,
214 struct hd_geometry *geo)
215{
216 if (dasd_check_blocksize(block->bp_block) != 0)
217 return -EINVAL;
218 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
219 geo->heads = 16;
220 geo->sectors = 128 >> block->s2b_shift;
221 return 0;
222}
223
224static dasd_erp_fn_t
225dasd_fba_erp_action(struct dasd_ccw_req * cqr)
226{
227 return dasd_default_erp_action;
228}
229
230static dasd_erp_fn_t
231dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
232{
233 if (cqr->function == dasd_default_erp_action)
234 return dasd_default_erp_postaction;
235
236 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
237 cqr->function);
238 return NULL;
239}
240
241static void dasd_fba_check_for_device_change(struct dasd_device *device,
242 struct dasd_ccw_req *cqr,
243 struct irb *irb)
244{
245 char mask;
246
247
248 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
249 if ((irb->scsw.cmd.dstat & mask) == mask)
250 dasd_generic_handle_state_change(device);
251};
252
253static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
254 struct dasd_block *block,
255 struct request *req)
256{
257 struct dasd_fba_private *private;
258 unsigned long *idaws;
259 struct LO_fba_data *LO_data;
260 struct dasd_ccw_req *cqr;
261 struct ccw1 *ccw;
262 struct req_iterator iter;
263 struct bio_vec *bv;
264 char *dst;
265 int count, cidaw, cplength, datasize;
266 sector_t recid, first_rec, last_rec;
267 unsigned int blksize, off;
268 unsigned char cmd;
269
270 private = (struct dasd_fba_private *) block->base->private;
271 if (rq_data_dir(req) == READ) {
272 cmd = DASD_FBA_CCW_READ;
273 } else if (rq_data_dir(req) == WRITE) {
274 cmd = DASD_FBA_CCW_WRITE;
275 } else
276 return ERR_PTR(-EINVAL);
277 blksize = block->bp_block;
278
279 first_rec = blk_rq_pos(req) >> block->s2b_shift;
280 last_rec =
281 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
282
283 count = 0;
284 cidaw = 0;
285 rq_for_each_segment(bv, req, iter) {
286 if (bv->bv_len & (blksize - 1))
287
288 return ERR_PTR(-EINVAL);
289 count += bv->bv_len >> (block->s2b_shift + 9);
290#if defined(CONFIG_64BIT)
291 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
292 cidaw += bv->bv_len / blksize;
293#endif
294 }
295
296 if (count != last_rec - first_rec + 1)
297 return ERR_PTR(-EINVAL);
298
299 cplength = 2 + count;
300
301 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
302 cidaw * sizeof(unsigned long);
303
304
305
306
307 if (private->rdc_data.mode.bits.data_chain == 0) {
308 cplength += count - 1;
309 datasize += (count - 1)*sizeof(struct LO_fba_data);
310 }
311
312 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
313 if (IS_ERR(cqr))
314 return cqr;
315 ccw = cqr->cpaddr;
316
317 define_extent(ccw++, cqr->data, rq_data_dir(req),
318 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
319
320 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
321 LO_data = (struct LO_fba_data *) (idaws + cidaw);
322
323 if (private->rdc_data.mode.bits.data_chain != 0) {
324 ccw[-1].flags |= CCW_FLAG_CC;
325 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
326 }
327 recid = first_rec;
328 rq_for_each_segment(bv, req, iter) {
329 dst = page_address(bv->bv_page) + bv->bv_offset;
330 if (dasd_page_cache) {
331 char *copy = kmem_cache_alloc(dasd_page_cache,
332 GFP_DMA | __GFP_NOWARN);
333 if (copy && rq_data_dir(req) == WRITE)
334 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
335 if (copy)
336 dst = copy + bv->bv_offset;
337 }
338 for (off = 0; off < bv->bv_len; off += blksize) {
339
340 if (private->rdc_data.mode.bits.data_chain == 0) {
341 ccw[-1].flags |= CCW_FLAG_CC;
342 locate_record(ccw, LO_data++,
343 rq_data_dir(req),
344 recid - first_rec, 1);
345 ccw->flags = CCW_FLAG_CC;
346 ccw++;
347 } else {
348 if (recid > first_rec)
349 ccw[-1].flags |= CCW_FLAG_DC;
350 else
351 ccw[-1].flags |= CCW_FLAG_CC;
352 }
353 ccw->cmd_code = cmd;
354 ccw->count = block->bp_block;
355 if (idal_is_needed(dst, blksize)) {
356 ccw->cda = (__u32)(addr_t) idaws;
357 ccw->flags = CCW_FLAG_IDA;
358 idaws = idal_create_words(idaws, dst, blksize);
359 } else {
360 ccw->cda = (__u32)(addr_t) dst;
361 ccw->flags = 0;
362 }
363 ccw++;
364 dst += blksize;
365 recid++;
366 }
367 }
368 if (blk_noretry_request(req) ||
369 block->base->features & DASD_FEATURE_FAILFAST)
370 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
371 cqr->startdev = memdev;
372 cqr->memdev = memdev;
373 cqr->block = block;
374 cqr->expires = memdev->default_expires * HZ;
375 cqr->retries = memdev->default_retries;
376 cqr->buildclk = get_tod_clock();
377 cqr->status = DASD_CQR_FILLED;
378 return cqr;
379}
380
381static int
382dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
383{
384 struct dasd_fba_private *private;
385 struct ccw1 *ccw;
386 struct req_iterator iter;
387 struct bio_vec *bv;
388 char *dst, *cda;
389 unsigned int blksize, off;
390 int status;
391
392 if (!dasd_page_cache)
393 goto out;
394 private = (struct dasd_fba_private *) cqr->block->base->private;
395 blksize = cqr->block->bp_block;
396 ccw = cqr->cpaddr;
397
398 ccw++;
399 if (private->rdc_data.mode.bits.data_chain != 0)
400 ccw++;
401 rq_for_each_segment(bv, req, iter) {
402 dst = page_address(bv->bv_page) + bv->bv_offset;
403 for (off = 0; off < bv->bv_len; off += blksize) {
404
405 if (private->rdc_data.mode.bits.data_chain == 0)
406 ccw++;
407 if (dst) {
408 if (ccw->flags & CCW_FLAG_IDA)
409 cda = *((char **)((addr_t) ccw->cda));
410 else
411 cda = (char *)((addr_t) ccw->cda);
412 if (dst != cda) {
413 if (rq_data_dir(req) == READ)
414 memcpy(dst, cda, bv->bv_len);
415 kmem_cache_free(dasd_page_cache,
416 (void *)((addr_t)cda & PAGE_MASK));
417 }
418 dst = NULL;
419 }
420 ccw++;
421 }
422 }
423out:
424 status = cqr->status == DASD_CQR_DONE;
425 dasd_sfree_request(cqr, cqr->memdev);
426 return status;
427}
428
429static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
430{
431 if (cqr->retries < 0)
432 cqr->status = DASD_CQR_FAILED;
433 else
434 cqr->status = DASD_CQR_FILLED;
435};
436
437static int
438dasd_fba_fill_info(struct dasd_device * device,
439 struct dasd_information2_t * info)
440{
441 info->label_block = 1;
442 info->FBA_layout = 1;
443 info->format = DASD_FORMAT_LDL;
444 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
445 memcpy(info->characteristics,
446 &((struct dasd_fba_private *) device->private)->rdc_data,
447 sizeof (struct dasd_fba_characteristics));
448 info->confdata_size = 0;
449 return 0;
450}
451
452static void
453dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
454 char *reason)
455{
456 u64 *sense;
457
458 sense = (u64 *) dasd_get_sense(irb);
459 if (sense) {
460 DBF_DEV_EVENT(DBF_EMERG, device,
461 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
462 "%016llx", reason,
463 scsw_is_tm(&irb->scsw) ? "t" : "c",
464 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
465 scsw_dstat(&irb->scsw), sense[0], sense[1],
466 sense[2], sense[3]);
467 } else {
468 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
469 "SORRY - NO VALID SENSE AVAILABLE\n");
470 }
471}
472
473
474static void
475dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
476 struct irb *irb)
477{
478 char *page;
479 struct ccw1 *act, *end, *last;
480 int len, sl, sct, count;
481
482 page = (char *) get_zeroed_page(GFP_ATOMIC);
483 if (page == NULL) {
484 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
485 "No memory to dump sense data");
486 return;
487 }
488 len = sprintf(page, PRINTK_HEADER
489 " I/O status report for device %s:\n",
490 dev_name(&device->cdev->dev));
491 len += sprintf(page + len, PRINTK_HEADER
492 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
493 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
494 len += sprintf(page + len, PRINTK_HEADER
495 " device %s: Failing CCW: %p\n",
496 dev_name(&device->cdev->dev),
497 (void *) (addr_t) irb->scsw.cmd.cpa);
498 if (irb->esw.esw0.erw.cons) {
499 for (sl = 0; sl < 4; sl++) {
500 len += sprintf(page + len, PRINTK_HEADER
501 " Sense(hex) %2d-%2d:",
502 (8 * sl), ((8 * sl) + 7));
503
504 for (sct = 0; sct < 8; sct++) {
505 len += sprintf(page + len, " %02x",
506 irb->ecw[8 * sl + sct]);
507 }
508 len += sprintf(page + len, "\n");
509 }
510 } else {
511 len += sprintf(page + len, PRINTK_HEADER
512 " SORRY - NO VALID SENSE AVAILABLE\n");
513 }
514 printk(KERN_ERR "%s", page);
515
516
517
518 act = req->cpaddr;
519 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
520 end = min(act + 8, last);
521 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
522 while (act <= end) {
523 len += sprintf(page + len, PRINTK_HEADER
524 " CCW %p: %08X %08X DAT:",
525 act, ((int *) act)[0], ((int *) act)[1]);
526 for (count = 0; count < 32 && count < act->count;
527 count += sizeof(int))
528 len += sprintf(page + len, " %08X",
529 ((int *) (addr_t) act->cda)
530 [(count>>2)]);
531 len += sprintf(page + len, "\n");
532 act++;
533 }
534 printk(KERN_ERR "%s", page);
535
536
537
538 len = 0;
539 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
540 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
541 len += sprintf(page + len, PRINTK_HEADER "......\n");
542 }
543 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
544 while (act <= end) {
545 len += sprintf(page + len, PRINTK_HEADER
546 " CCW %p: %08X %08X DAT:",
547 act, ((int *) act)[0], ((int *) act)[1]);
548 for (count = 0; count < 32 && count < act->count;
549 count += sizeof(int))
550 len += sprintf(page + len, " %08X",
551 ((int *) (addr_t) act->cda)
552 [(count>>2)]);
553 len += sprintf(page + len, "\n");
554 act++;
555 }
556
557
558 if (act < last - 2) {
559 act = last - 2;
560 len += sprintf(page + len, PRINTK_HEADER "......\n");
561 }
562 while (act <= last) {
563 len += sprintf(page + len, PRINTK_HEADER
564 " CCW %p: %08X %08X DAT:",
565 act, ((int *) act)[0], ((int *) act)[1]);
566 for (count = 0; count < 32 && count < act->count;
567 count += sizeof(int))
568 len += sprintf(page + len, " %08X",
569 ((int *) (addr_t) act->cda)
570 [(count>>2)]);
571 len += sprintf(page + len, "\n");
572 act++;
573 }
574 if (len > 0)
575 printk(KERN_ERR "%s", page);
576 free_page((unsigned long) page);
577}
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592
593static struct dasd_discipline dasd_fba_discipline = {
594 .owner = THIS_MODULE,
595 .name = "FBA ",
596 .ebcname = "FBA ",
597 .max_blocks = 96,
598 .check_device = dasd_fba_check_characteristics,
599 .do_analysis = dasd_fba_do_analysis,
600 .verify_path = dasd_generic_verify_path,
601 .fill_geometry = dasd_fba_fill_geometry,
602 .start_IO = dasd_start_IO,
603 .term_IO = dasd_term_IO,
604 .handle_terminated_request = dasd_fba_handle_terminated_request,
605 .erp_action = dasd_fba_erp_action,
606 .erp_postaction = dasd_fba_erp_postaction,
607 .check_for_device_change = dasd_fba_check_for_device_change,
608 .build_cp = dasd_fba_build_cp,
609 .free_cp = dasd_fba_free_cp,
610 .dump_sense = dasd_fba_dump_sense,
611 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
612 .fill_info = dasd_fba_fill_info,
613};
614
615static int __init
616dasd_fba_init(void)
617{
618 int ret;
619
620 ASCEBC(dasd_fba_discipline.ebcname, 4);
621 ret = ccw_driver_register(&dasd_fba_driver);
622 if (!ret)
623 wait_for_device_probe();
624
625 return ret;
626}
627
628static void __exit
629dasd_fba_cleanup(void)
630{
631 ccw_driver_unregister(&dasd_fba_driver);
632}
633
634module_init(dasd_fba_init);
635module_exit(dasd_fba_cleanup);
636
