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[SCSI] Let scsi_cmnd->cmnd use request->cmd buffer
[linux-2.6/linux-loongson.git] / drivers / s390 / block / dasd_fba.c
blob116611583df8215ea1ec7ecc6f9d25987812b00d
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 kfree(device->private);
143 return PTR_ERR(block);
144 }
145 device->block = block;
146 block->base = device;
147
148 /* Read Device Characteristics */
149 rdc_data = (void *) &(private->rdc_data);
150 rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
151 if (rc) {
152 DEV_MESSAGE(KERN_WARNING, device,
153 "Read device characteristics returned error %d",
154 rc);
155 return rc;
156 }
157
158 DEV_MESSAGE(KERN_INFO, device,
159 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
160 cdev->id.dev_type,
161 cdev->id.dev_model,
162 cdev->id.cu_type,
163 cdev->id.cu_model,
164 ((private->rdc_data.blk_bdsa *
165 (private->rdc_data.blk_size >> 9)) >> 11),
166 private->rdc_data.blk_size);
167 return 0;
168 }
169
170 static int dasd_fba_do_analysis(struct dasd_block *block)
171 {
172 struct dasd_fba_private *private;
173 int sb, rc;
174
175 private = (struct dasd_fba_private *) block->base->private;
176 rc = dasd_check_blocksize(private->rdc_data.blk_size);
177 if (rc) {
178 DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d",
179 private->rdc_data.blk_size);
180 return rc;
181 }
182 block->blocks = private->rdc_data.blk_bdsa;
183 block->bp_block = private->rdc_data.blk_size;
184 block->s2b_shift = 0; /* bits to shift 512 to get a block */
185 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
186 block->s2b_shift++;
187 return 0;
188 }
189
190 static int dasd_fba_fill_geometry(struct dasd_block *block,
191 struct hd_geometry *geo)
192 {
193 if (dasd_check_blocksize(block->bp_block) != 0)
194 return -EINVAL;
195 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
196 geo->heads = 16;
197 geo->sectors = 128 >> block->s2b_shift;
198 return 0;
199 }
200
201 static dasd_erp_fn_t
202 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
203 {
204 return dasd_default_erp_action;
205 }
206
207 static dasd_erp_fn_t
208 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
209 {
210 if (cqr->function == dasd_default_erp_action)
211 return dasd_default_erp_postaction;
212
213 DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
214 cqr->function);
215 return NULL;
216 }
217
218 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
219 struct irb *irb)
220 {
221 char mask;
222
223 /* first of all check for state change pending interrupt */
224 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
225 if ((irb->scsw.dstat & mask) == mask) {
226 dasd_generic_handle_state_change(device);
227 return;
228 }
229
230 /* check for unsolicited interrupts */
231 DEV_MESSAGE(KERN_DEBUG, device, "%s",
232 "unsolicited interrupt received");
233 device->discipline->dump_sense(device, NULL, irb);
234 dasd_schedule_device_bh(device);
235 return;
236 };
237
238 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
239 struct dasd_block *block,
240 struct request *req)
241 {
242 struct dasd_fba_private *private;
243 unsigned long *idaws;
244 struct LO_fba_data *LO_data;
245 struct dasd_ccw_req *cqr;
246 struct ccw1 *ccw;
247 struct req_iterator iter;
248 struct bio_vec *bv;
249 char *dst;
250 int count, cidaw, cplength, datasize;
251 sector_t recid, first_rec, last_rec;
252 unsigned int blksize, off;
253 unsigned char cmd;
254
255 private = (struct dasd_fba_private *) block->base->private;
256 if (rq_data_dir(req) == READ) {
257 cmd = DASD_FBA_CCW_READ;
258 } else if (rq_data_dir(req) == WRITE) {
259 cmd = DASD_FBA_CCW_WRITE;
260 } else
261 return ERR_PTR(-EINVAL);
262 blksize = block->bp_block;
263 /* Calculate record id of first and last block. */
264 first_rec = req->sector >> block->s2b_shift;
265 last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
266 /* Check struct bio and count the number of blocks for the request. */
267 count = 0;
268 cidaw = 0;
269 rq_for_each_segment(bv, req, iter) {
270 if (bv->bv_len & (blksize - 1))
271 /* Fba can only do full blocks. */
272 return ERR_PTR(-EINVAL);
273 count += bv->bv_len >> (block->s2b_shift + 9);
274 #if defined(CONFIG_64BIT)
275 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
276 cidaw += bv->bv_len / blksize;
277 #endif
278 }
279 /* Paranoia. */
280 if (count != last_rec - first_rec + 1)
281 return ERR_PTR(-EINVAL);
282 /* 1x define extent + 1x locate record + number of blocks */
283 cplength = 2 + count;
284 /* 1x define extent + 1x locate record */
285 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
286 cidaw * sizeof(unsigned long);
287 /*
288 * Find out number of additional locate record ccws if the device
289 * can't do data chaining.
290 */
291 if (private->rdc_data.mode.bits.data_chain == 0) {
292 cplength += count - 1;
293 datasize += (count - 1)*sizeof(struct LO_fba_data);
294 }
295 /* Allocate the ccw request. */
296 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
297 cplength, datasize, memdev);
298 if (IS_ERR(cqr))
299 return cqr;
300 ccw = cqr->cpaddr;
301 /* First ccw is define extent. */
302 define_extent(ccw++, cqr->data, rq_data_dir(req),
303 block->bp_block, req->sector, req->nr_sectors);
304 /* Build locate_record + read/write ccws. */
305 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
306 LO_data = (struct LO_fba_data *) (idaws + cidaw);
307 /* Locate record for all blocks for smart devices. */
308 if (private->rdc_data.mode.bits.data_chain != 0) {
309 ccw[-1].flags |= CCW_FLAG_CC;
310 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
311 }
312 recid = first_rec;
313 rq_for_each_segment(bv, req, iter) {
314 dst = page_address(bv->bv_page) + bv->bv_offset;
315 if (dasd_page_cache) {
316 char *copy = kmem_cache_alloc(dasd_page_cache,
317 GFP_DMA | __GFP_NOWARN);
318 if (copy && rq_data_dir(req) == WRITE)
319 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
320 if (copy)
321 dst = copy + bv->bv_offset;
322 }
323 for (off = 0; off < bv->bv_len; off += blksize) {
324 /* Locate record for stupid devices. */
325 if (private->rdc_data.mode.bits.data_chain == 0) {
326 ccw[-1].flags |= CCW_FLAG_CC;
327 locate_record(ccw, LO_data++,
328 rq_data_dir(req),
329 recid - first_rec, 1);
330 ccw->flags = CCW_FLAG_CC;
331 ccw++;
332 } else {
333 if (recid > first_rec)
334 ccw[-1].flags |= CCW_FLAG_DC;
335 else
336 ccw[-1].flags |= CCW_FLAG_CC;
337 }
338 ccw->cmd_code = cmd;
339 ccw->count = block->bp_block;
340 if (idal_is_needed(dst, blksize)) {
341 ccw->cda = (__u32)(addr_t) idaws;
342 ccw->flags = CCW_FLAG_IDA;
343 idaws = idal_create_words(idaws, dst, blksize);
344 } else {
345 ccw->cda = (__u32)(addr_t) dst;
346 ccw->flags = 0;
347 }
348 ccw++;
349 dst += blksize;
350 recid++;
351 }
352 }
353 if (req->cmd_flags & REQ_FAILFAST)
354 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
355 cqr->startdev = memdev;
356 cqr->memdev = memdev;
357 cqr->block = block;
358 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
359 cqr->retries = 32;
360 cqr->buildclk = get_clock();
361 cqr->status = DASD_CQR_FILLED;
362 return cqr;
363 }
364
365 static int
366 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
367 {
368 struct dasd_fba_private *private;
369 struct ccw1 *ccw;
370 struct req_iterator iter;
371 struct bio_vec *bv;
372 char *dst, *cda;
373 unsigned int blksize, off;
374 int status;
375
376 if (!dasd_page_cache)
377 goto out;
378 private = (struct dasd_fba_private *) cqr->block->base->private;
379 blksize = cqr->block->bp_block;
380 ccw = cqr->cpaddr;
381 /* Skip over define extent & locate record. */
382 ccw++;
383 if (private->rdc_data.mode.bits.data_chain != 0)
384 ccw++;
385 rq_for_each_segment(bv, req, iter) {
386 dst = page_address(bv->bv_page) + bv->bv_offset;
387 for (off = 0; off < bv->bv_len; off += blksize) {
388 /* Skip locate record. */
389 if (private->rdc_data.mode.bits.data_chain == 0)
390 ccw++;
391 if (dst) {
392 if (ccw->flags & CCW_FLAG_IDA)
393 cda = *((char **)((addr_t) ccw->cda));
394 else
395 cda = (char *)((addr_t) ccw->cda);
396 if (dst != cda) {
397 if (rq_data_dir(req) == READ)
398 memcpy(dst, cda, bv->bv_len);
399 kmem_cache_free(dasd_page_cache,
400 (void *)((addr_t)cda & PAGE_MASK));
401 }
402 dst = NULL;
403 }
404 ccw++;
405 }
406 }
407 out:
408 status = cqr->status == DASD_CQR_DONE;
409 dasd_sfree_request(cqr, cqr->memdev);
410 return status;
411 }
412
413 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
414 {
415 cqr->status = DASD_CQR_FILLED;
416 };
417
418 static int
419 dasd_fba_fill_info(struct dasd_device * device,
420 struct dasd_information2_t * info)
421 {
422 info->label_block = 1;
423 info->FBA_layout = 1;
424 info->format = DASD_FORMAT_LDL;
425 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
426 memcpy(info->characteristics,
427 &((struct dasd_fba_private *) device->private)->rdc_data,
428 sizeof (struct dasd_fba_characteristics));
429 info->confdata_size = 0;
430 return 0;
431 }
432
433 static void
434 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
435 struct irb *irb)
436 {
437 char *page;
438 struct ccw1 *act, *end, *last;
439 int len, sl, sct, count;
440
441 page = (char *) get_zeroed_page(GFP_ATOMIC);
442 if (page == NULL) {
443 DEV_MESSAGE(KERN_ERR, device, " %s",
444 "No memory to dump sense data");
445 return;
446 }
447 len = sprintf(page, KERN_ERR PRINTK_HEADER
448 " I/O status report for device %s:\n",
449 device->cdev->dev.bus_id);
450 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
451 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
452 irb->scsw.cstat, irb->scsw.dstat);
453 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
454 " device %s: Failing CCW: %p\n",
455 device->cdev->dev.bus_id,
456 (void *) (addr_t) irb->scsw.cpa);
457 if (irb->esw.esw0.erw.cons) {
458 for (sl = 0; sl < 4; sl++) {
459 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
460 " Sense(hex) %2d-%2d:",
461 (8 * sl), ((8 * sl) + 7));
462
463 for (sct = 0; sct < 8; sct++) {
464 len += sprintf(page + len, " %02x",
465 irb->ecw[8 * sl + sct]);
466 }
467 len += sprintf(page + len, "\n");
468 }
469 } else {
470 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
471 " SORRY - NO VALID SENSE AVAILABLE\n");
472 }
473 MESSAGE_LOG(KERN_ERR, "%s",
474 page + sizeof(KERN_ERR PRINTK_HEADER));
475
476 /* dump the Channel Program */
477 /* print first CCWs (maximum 8) */
478 act = req->cpaddr;
479 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
480 end = min(act + 8, last);
481 len = sprintf(page, KERN_ERR PRINTK_HEADER
482 " Related CP in req: %p\n", req);
483 while (act <= end) {
484 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
485 " CCW %p: %08X %08X DAT:",
486 act, ((int *) act)[0], ((int *) act)[1]);
487 for (count = 0; count < 32 && count < act->count;
488 count += sizeof(int))
489 len += sprintf(page + len, " %08X",
490 ((int *) (addr_t) act->cda)
491 [(count>>2)]);
492 len += sprintf(page + len, "\n");
493 act++;
494 }
495 MESSAGE_LOG(KERN_ERR, "%s",
496 page + sizeof(KERN_ERR PRINTK_HEADER));
497
498
499 /* print failing CCW area */
500 len = 0;
501 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
502 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
503 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
504 }
505 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
506 while (act <= end) {
507 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
508 " CCW %p: %08X %08X DAT:",
509 act, ((int *) act)[0], ((int *) act)[1]);
510 for (count = 0; count < 32 && count < act->count;
511 count += sizeof(int))
512 len += sprintf(page + len, " %08X",
513 ((int *) (addr_t) act->cda)
514 [(count>>2)]);
515 len += sprintf(page + len, "\n");
516 act++;
517 }
518
519 /* print last CCWs */
520 if (act < last - 2) {
521 act = last - 2;
522 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
523 }
524 while (act <= last) {
525 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
526 " CCW %p: %08X %08X DAT:",
527 act, ((int *) act)[0], ((int *) act)[1]);
528 for (count = 0; count < 32 && count < act->count;
529 count += sizeof(int))
530 len += sprintf(page + len, " %08X",
531 ((int *) (addr_t) act->cda)
532 [(count>>2)]);
533 len += sprintf(page + len, "\n");
534 act++;
535 }
536 if (len > 0)
537 MESSAGE_LOG(KERN_ERR, "%s",
538 page + sizeof(KERN_ERR PRINTK_HEADER));
539 free_page((unsigned long) page);
540 }
541
542 /*
543 * max_blocks is dependent on the amount of storage that is available
544 * in the static io buffer for each device. Currently each device has
545 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
546 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
547 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
548 * addition we have one define extent ccw + 16 bytes of data and a
549 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
550 * That makes:
551 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
552 * We want to fit two into the available memory so that we can immediately
553 * start the next request if one finishes off. That makes 100.1 blocks
554 * for one request. Give a little safety and the result is 96.
555 */
556 static struct dasd_discipline dasd_fba_discipline = {
557 .owner = THIS_MODULE,
558 .name = "FBA ",
559 .ebcname = "FBA ",
560 .max_blocks = 96,
561 .check_device = dasd_fba_check_characteristics,
562 .do_analysis = dasd_fba_do_analysis,
563 .fill_geometry = dasd_fba_fill_geometry,
564 .start_IO = dasd_start_IO,
565 .term_IO = dasd_term_IO,
566 .handle_terminated_request = dasd_fba_handle_terminated_request,
567 .erp_action = dasd_fba_erp_action,
568 .erp_postaction = dasd_fba_erp_postaction,
569 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
570 .build_cp = dasd_fba_build_cp,
571 .free_cp = dasd_fba_free_cp,
572 .dump_sense = dasd_fba_dump_sense,
573 .fill_info = dasd_fba_fill_info,
574 };
575
576 static int __init
577 dasd_fba_init(void)
578 {
579 ASCEBC(dasd_fba_discipline.ebcname, 4);
580 return ccw_driver_register(&dasd_fba_driver);
581 }
582
583 static void __exit
584 dasd_fba_cleanup(void)
585 {
586 ccw_driver_unregister(&dasd_fba_driver);
587 }
588
589 module_init(dasd_fba_init);
590 module_exit(dasd_fba_cleanup);
linux kernel for loongson