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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / s390 / block / dasd_fba.c
blobf1d176021694886fc1b6c2ba1f30ee6318c322c8
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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
6 *
7 */
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> /* HDIO_GETGEO */
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/todclk.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 .name = "dasd-fba",
69 .owner = THIS_MODULE,
70 .ids = dasd_fba_ids,
71 .probe = dasd_fba_probe,
72 .remove = dasd_generic_remove,
73 .set_offline = dasd_generic_set_offline,
74 .set_online = dasd_fba_set_online,
75 .notify = dasd_generic_notify,
76 };
77
78 static void
79 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
80 int blksize, int beg, int nr)
81 {
82 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
83 ccw->flags = 0;
84 ccw->count = 16;
85 ccw->cda = (__u32) __pa(data);
86 memset(data, 0, sizeof (struct DE_fba_data));
87 if (rw == WRITE)
88 (data->mask).perm = 0x0;
89 else if (rw == READ)
90 (data->mask).perm = 0x1;
91 else
92 data->mask.perm = 0x2;
93 data->blk_size = blksize;
94 data->ext_loc = beg;
95 data->ext_end = nr - 1;
96 }
97
98 static void
99 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
100 int block_nr, int block_ct)
101 {
102 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
103 ccw->flags = 0;
104 ccw->count = 8;
105 ccw->cda = (__u32) __pa(data);
106 memset(data, 0, sizeof (struct LO_fba_data));
107 if (rw == WRITE)
108 data->operation.cmd = 0x5;
109 else if (rw == READ)
110 data->operation.cmd = 0x6;
111 else
112 data->operation.cmd = 0x8;
113 data->blk_nr = block_nr;
114 data->blk_ct = block_ct;
115 }
116
117 static int
118 dasd_fba_check_characteristics(struct dasd_device *device)
119 {
120 struct dasd_block *block;
121 struct dasd_fba_private *private;
122 struct ccw_device *cdev = device->cdev;
123 void *rdc_data;
124 int rc;
125
126 private = (struct dasd_fba_private *) device->private;
127 if (private == NULL) {
128 private = kzalloc(sizeof(struct dasd_fba_private),
129 GFP_KERNEL | GFP_DMA);
130 if (private == NULL) {
131 DEV_MESSAGE(KERN_WARNING, device, "%s",
132 "memory allocation failed for private "
133 "data");
134 return -ENOMEM;
135 }
136 device->private = (void *) private;
137 }
138 block = dasd_alloc_block();
139 if (IS_ERR(block)) {
140 DEV_MESSAGE(KERN_WARNING, device, "%s",
141 "could not allocate dasd block structure");
142 device->private = NULL;
143 kfree(private);
144 return PTR_ERR(block);
145 }
146 device->block = block;
147 block->base = device;
148
149 /* Read Device Characteristics */
150 rdc_data = (void *) &(private->rdc_data);
151 rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
152 if (rc) {
153 DEV_MESSAGE(KERN_WARNING, device,
154 "Read device characteristics returned error %d",
155 rc);
156 device->block = NULL;
157 dasd_free_block(block);
158 device->private = NULL;
159 kfree(private);
160 return rc;
161 }
162
163 DEV_MESSAGE(KERN_INFO, device,
164 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
165 cdev->id.dev_type,
166 cdev->id.dev_model,
167 cdev->id.cu_type,
168 cdev->id.cu_model,
169 ((private->rdc_data.blk_bdsa *
170 (private->rdc_data.blk_size >> 9)) >> 11),
171 private->rdc_data.blk_size);
172 return 0;
173 }
174
175 static int dasd_fba_do_analysis(struct dasd_block *block)
176 {
177 struct dasd_fba_private *private;
178 int sb, rc;
179
180 private = (struct dasd_fba_private *) block->base->private;
181 rc = dasd_check_blocksize(private->rdc_data.blk_size);
182 if (rc) {
183 DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d",
184 private->rdc_data.blk_size);
185 return rc;
186 }
187 block->blocks = private->rdc_data.blk_bdsa;
188 block->bp_block = private->rdc_data.blk_size;
189 block->s2b_shift = 0; /* bits to shift 512 to get a block */
190 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
191 block->s2b_shift++;
192 return 0;
193 }
194
195 static int dasd_fba_fill_geometry(struct dasd_block *block,
196 struct hd_geometry *geo)
197 {
198 if (dasd_check_blocksize(block->bp_block) != 0)
199 return -EINVAL;
200 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
201 geo->heads = 16;
202 geo->sectors = 128 >> block->s2b_shift;
203 return 0;
204 }
205
206 static dasd_erp_fn_t
207 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
208 {
209 return dasd_default_erp_action;
210 }
211
212 static dasd_erp_fn_t
213 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
214 {
215 if (cqr->function == dasd_default_erp_action)
216 return dasd_default_erp_postaction;
217
218 DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
219 cqr->function);
220 return NULL;
221 }
222
223 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
224 struct irb *irb)
225 {
226 char mask;
227
228 /* first of all check for state change pending interrupt */
229 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
230 if ((irb->scsw.cmd.dstat & mask) == mask) {
231 dasd_generic_handle_state_change(device);
232 return;
233 }
234
235 /* check for unsolicited interrupts */
236 DEV_MESSAGE(KERN_DEBUG, device, "%s",
237 "unsolicited interrupt received");
238 device->discipline->dump_sense(device, NULL, irb);
239 dasd_schedule_device_bh(device);
240 return;
241 };
242
243 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
244 struct dasd_block *block,
245 struct request *req)
246 {
247 struct dasd_fba_private *private;
248 unsigned long *idaws;
249 struct LO_fba_data *LO_data;
250 struct dasd_ccw_req *cqr;
251 struct ccw1 *ccw;
252 struct req_iterator iter;
253 struct bio_vec *bv;
254 char *dst;
255 int count, cidaw, cplength, datasize;
256 sector_t recid, first_rec, last_rec;
257 unsigned int blksize, off;
258 unsigned char cmd;
259
260 private = (struct dasd_fba_private *) block->base->private;
261 if (rq_data_dir(req) == READ) {
262 cmd = DASD_FBA_CCW_READ;
263 } else if (rq_data_dir(req) == WRITE) {
264 cmd = DASD_FBA_CCW_WRITE;
265 } else
266 return ERR_PTR(-EINVAL);
267 blksize = block->bp_block;
268 /* Calculate record id of first and last block. */
269 first_rec = req->sector >> block->s2b_shift;
270 last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
271 /* Check struct bio and count the number of blocks for the request. */
272 count = 0;
273 cidaw = 0;
274 rq_for_each_segment(bv, req, iter) {
275 if (bv->bv_len & (blksize - 1))
276 /* Fba can only do full blocks. */
277 return ERR_PTR(-EINVAL);
278 count += bv->bv_len >> (block->s2b_shift + 9);
279 #if defined(CONFIG_64BIT)
280 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
281 cidaw += bv->bv_len / blksize;
282 #endif
283 }
284 /* Paranoia. */
285 if (count != last_rec - first_rec + 1)
286 return ERR_PTR(-EINVAL);
287 /* 1x define extent + 1x locate record + number of blocks */
288 cplength = 2 + count;
289 /* 1x define extent + 1x locate record */
290 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
291 cidaw * sizeof(unsigned long);
292 /*
293 * Find out number of additional locate record ccws if the device
294 * can't do data chaining.
295 */
296 if (private->rdc_data.mode.bits.data_chain == 0) {
297 cplength += count - 1;
298 datasize += (count - 1)*sizeof(struct LO_fba_data);
299 }
300 /* Allocate the ccw request. */
301 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
302 cplength, datasize, memdev);
303 if (IS_ERR(cqr))
304 return cqr;
305 ccw = cqr->cpaddr;
306 /* First ccw is define extent. */
307 define_extent(ccw++, cqr->data, rq_data_dir(req),
308 block->bp_block, req->sector, req->nr_sectors);
309 /* Build locate_record + read/write ccws. */
310 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
311 LO_data = (struct LO_fba_data *) (idaws + cidaw);
312 /* Locate record for all blocks for smart devices. */
313 if (private->rdc_data.mode.bits.data_chain != 0) {
314 ccw[-1].flags |= CCW_FLAG_CC;
315 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
316 }
317 recid = first_rec;
318 rq_for_each_segment(bv, req, iter) {
319 dst = page_address(bv->bv_page) + bv->bv_offset;
320 if (dasd_page_cache) {
321 char *copy = kmem_cache_alloc(dasd_page_cache,
322 GFP_DMA | __GFP_NOWARN);
323 if (copy && rq_data_dir(req) == WRITE)
324 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
325 if (copy)
326 dst = copy + bv->bv_offset;
327 }
328 for (off = 0; off < bv->bv_len; off += blksize) {
329 /* Locate record for stupid devices. */
330 if (private->rdc_data.mode.bits.data_chain == 0) {
331 ccw[-1].flags |= CCW_FLAG_CC;
332 locate_record(ccw, LO_data++,
333 rq_data_dir(req),
334 recid - first_rec, 1);
335 ccw->flags = CCW_FLAG_CC;
336 ccw++;
337 } else {
338 if (recid > first_rec)
339 ccw[-1].flags |= CCW_FLAG_DC;
340 else
341 ccw[-1].flags |= CCW_FLAG_CC;
342 }
343 ccw->cmd_code = cmd;
344 ccw->count = block->bp_block;
345 if (idal_is_needed(dst, blksize)) {
346 ccw->cda = (__u32)(addr_t) idaws;
347 ccw->flags = CCW_FLAG_IDA;
348 idaws = idal_create_words(idaws, dst, blksize);
349 } else {
350 ccw->cda = (__u32)(addr_t) dst;
351 ccw->flags = 0;
352 }
353 ccw++;
354 dst += blksize;
355 recid++;
356 }
357 }
358 if (blk_noretry_request(req) ||
359 block->base->features & DASD_FEATURE_FAILFAST)
360 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
361 cqr->startdev = memdev;
362 cqr->memdev = memdev;
363 cqr->block = block;
364 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
365 cqr->retries = 32;
366 cqr->buildclk = get_clock();
367 cqr->status = DASD_CQR_FILLED;
368 return cqr;
369 }
370
371 static int
372 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
373 {
374 struct dasd_fba_private *private;
375 struct ccw1 *ccw;
376 struct req_iterator iter;
377 struct bio_vec *bv;
378 char *dst, *cda;
379 unsigned int blksize, off;
380 int status;
381
382 if (!dasd_page_cache)
383 goto out;
384 private = (struct dasd_fba_private *) cqr->block->base->private;
385 blksize = cqr->block->bp_block;
386 ccw = cqr->cpaddr;
387 /* Skip over define extent & locate record. */
388 ccw++;
389 if (private->rdc_data.mode.bits.data_chain != 0)
390 ccw++;
391 rq_for_each_segment(bv, req, iter) {
392 dst = page_address(bv->bv_page) + bv->bv_offset;
393 for (off = 0; off < bv->bv_len; off += blksize) {
394 /* Skip locate record. */
395 if (private->rdc_data.mode.bits.data_chain == 0)
396 ccw++;
397 if (dst) {
398 if (ccw->flags & CCW_FLAG_IDA)
399 cda = *((char **)((addr_t) ccw->cda));
400 else
401 cda = (char *)((addr_t) ccw->cda);
402 if (dst != cda) {
403 if (rq_data_dir(req) == READ)
404 memcpy(dst, cda, bv->bv_len);
405 kmem_cache_free(dasd_page_cache,
406 (void *)((addr_t)cda & PAGE_MASK));
407 }
408 dst = NULL;
409 }
410 ccw++;
411 }
412 }
413 out:
414 status = cqr->status == DASD_CQR_DONE;
415 dasd_sfree_request(cqr, cqr->memdev);
416 return status;
417 }
418
419 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
420 {
421 cqr->status = DASD_CQR_FILLED;
422 };
423
424 static int
425 dasd_fba_fill_info(struct dasd_device * device,
426 struct dasd_information2_t * info)
427 {
428 info->label_block = 1;
429 info->FBA_layout = 1;
430 info->format = DASD_FORMAT_LDL;
431 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
432 memcpy(info->characteristics,
433 &((struct dasd_fba_private *) device->private)->rdc_data,
434 sizeof (struct dasd_fba_characteristics));
435 info->confdata_size = 0;
436 return 0;
437 }
438
439 static void
440 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
441 struct irb *irb)
442 {
443 char *page;
444 struct ccw1 *act, *end, *last;
445 int len, sl, sct, count;
446
447 page = (char *) get_zeroed_page(GFP_ATOMIC);
448 if (page == NULL) {
449 DEV_MESSAGE(KERN_ERR, device, " %s",
450 "No memory to dump sense data");
451 return;
452 }
453 len = sprintf(page, KERN_ERR PRINTK_HEADER
454 " I/O status report for device %s:\n",
455 dev_name(&device->cdev->dev));
456 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
457 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
458 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
459 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
460 " device %s: Failing CCW: %p\n",
461 dev_name(&device->cdev->dev),
462 (void *) (addr_t) irb->scsw.cmd.cpa);
463 if (irb->esw.esw0.erw.cons) {
464 for (sl = 0; sl < 4; sl++) {
465 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
466 " Sense(hex) %2d-%2d:",
467 (8 * sl), ((8 * sl) + 7));
468
469 for (sct = 0; sct < 8; sct++) {
470 len += sprintf(page + len, " %02x",
471 irb->ecw[8 * sl + sct]);
472 }
473 len += sprintf(page + len, "\n");
474 }
475 } else {
476 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
477 " SORRY - NO VALID SENSE AVAILABLE\n");
478 }
479 MESSAGE_LOG(KERN_ERR, "%s",
480 page + sizeof(KERN_ERR PRINTK_HEADER));
481
482 /* dump the Channel Program */
483 /* print first CCWs (maximum 8) */
484 act = req->cpaddr;
485 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
486 end = min(act + 8, last);
487 len = sprintf(page, KERN_ERR PRINTK_HEADER
488 " Related CP in req: %p\n", req);
489 while (act <= end) {
490 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
491 " CCW %p: %08X %08X DAT:",
492 act, ((int *) act)[0], ((int *) act)[1]);
493 for (count = 0; count < 32 && count < act->count;
494 count += sizeof(int))
495 len += sprintf(page + len, " %08X",
496 ((int *) (addr_t) act->cda)
497 [(count>>2)]);
498 len += sprintf(page + len, "\n");
499 act++;
500 }
501 MESSAGE_LOG(KERN_ERR, "%s",
502 page + sizeof(KERN_ERR PRINTK_HEADER));
503
504
505 /* print failing CCW area */
506 len = 0;
507 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
508 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
509 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
510 }
511 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
512 while (act <= end) {
513 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
514 " CCW %p: %08X %08X DAT:",
515 act, ((int *) act)[0], ((int *) act)[1]);
516 for (count = 0; count < 32 && count < act->count;
517 count += sizeof(int))
518 len += sprintf(page + len, " %08X",
519 ((int *) (addr_t) act->cda)
520 [(count>>2)]);
521 len += sprintf(page + len, "\n");
522 act++;
523 }
524
525 /* print last CCWs */
526 if (act < last - 2) {
527 act = last - 2;
528 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
529 }
530 while (act <= last) {
531 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
532 " CCW %p: %08X %08X DAT:",
533 act, ((int *) act)[0], ((int *) act)[1]);
534 for (count = 0; count < 32 && count < act->count;
535 count += sizeof(int))
536 len += sprintf(page + len, " %08X",
537 ((int *) (addr_t) act->cda)
538 [(count>>2)]);
539 len += sprintf(page + len, "\n");
540 act++;
541 }
542 if (len > 0)
543 MESSAGE_LOG(KERN_ERR, "%s",
544 page + sizeof(KERN_ERR PRINTK_HEADER));
545 free_page((unsigned long) page);
546 }
547
548 /*
549 * max_blocks is dependent on the amount of storage that is available
550 * in the static io buffer for each device. Currently each device has
551 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
552 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
553 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
554 * addition we have one define extent ccw + 16 bytes of data and a
555 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
556 * That makes:
557 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
558 * We want to fit two into the available memory so that we can immediately
559 * start the next request if one finishes off. That makes 100.1 blocks
560 * for one request. Give a little safety and the result is 96.
561 */
562 static struct dasd_discipline dasd_fba_discipline = {
563 .owner = THIS_MODULE,
564 .name = "FBA ",
565 .ebcname = "FBA ",
566 .max_blocks = 96,
567 .check_device = dasd_fba_check_characteristics,
568 .do_analysis = dasd_fba_do_analysis,
569 .fill_geometry = dasd_fba_fill_geometry,
570 .start_IO = dasd_start_IO,
571 .term_IO = dasd_term_IO,
572 .handle_terminated_request = dasd_fba_handle_terminated_request,
573 .erp_action = dasd_fba_erp_action,
574 .erp_postaction = dasd_fba_erp_postaction,
575 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
576 .build_cp = dasd_fba_build_cp,
577 .free_cp = dasd_fba_free_cp,
578 .dump_sense = dasd_fba_dump_sense,
579 .fill_info = dasd_fba_fill_info,
580 };
581
582 static int __init
583 dasd_fba_init(void)
584 {
585 ASCEBC(dasd_fba_discipline.ebcname, 4);
586 return ccw_driver_register(&dasd_fba_driver);
587 }
588
589 static void __exit
590 dasd_fba_cleanup(void)
591 {
592 ccw_driver_unregister(&dasd_fba_driver);
593 }
594
595 module_init(dasd_fba_init);
596 module_exit(dasd_fba_cleanup);
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