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Introduce rq_for_each_segment replacing rq_for_each_bio
[deliverable/linux.git] / drivers / s390 / block / dasd_fba.c
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_fba_private *private;
121 struct ccw_device *cdev = device->cdev;
122 void *rdc_data;
123 int rc;
124
125 private = (struct dasd_fba_private *) device->private;
126 if (private == NULL) {
127 private = kzalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
128 if (private == NULL) {
129 DEV_MESSAGE(KERN_WARNING, device, "%s",
130 "memory allocation failed for private "
131 "data");
132 return -ENOMEM;
133 }
134 device->private = (void *) private;
135 }
136 /* Read Device Characteristics */
137 rdc_data = (void *) &(private->rdc_data);
138 rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
139 if (rc) {
140 DEV_MESSAGE(KERN_WARNING, device,
141 "Read device characteristics returned error %d",
142 rc);
143 return rc;
144 }
145
146 DEV_MESSAGE(KERN_INFO, device,
147 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
148 cdev->id.dev_type,
149 cdev->id.dev_model,
150 cdev->id.cu_type,
151 cdev->id.cu_model,
152 ((private->rdc_data.blk_bdsa *
153 (private->rdc_data.blk_size >> 9)) >> 11),
154 private->rdc_data.blk_size);
155 return 0;
156 }
157
158 static int
159 dasd_fba_do_analysis(struct dasd_device *device)
160 {
161 struct dasd_fba_private *private;
162 int sb, rc;
163
164 private = (struct dasd_fba_private *) device->private;
165 rc = dasd_check_blocksize(private->rdc_data.blk_size);
166 if (rc) {
167 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
168 private->rdc_data.blk_size);
169 return rc;
170 }
171 device->blocks = private->rdc_data.blk_bdsa;
172 device->bp_block = private->rdc_data.blk_size;
173 device->s2b_shift = 0; /* bits to shift 512 to get a block */
174 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
175 device->s2b_shift++;
176 return 0;
177 }
178
179 static int
180 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
181 {
182 if (dasd_check_blocksize(device->bp_block) != 0)
183 return -EINVAL;
184 geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
185 geo->heads = 16;
186 geo->sectors = 128 >> device->s2b_shift;
187 return 0;
188 }
189
190 static dasd_era_t
191 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
192 {
193 struct dasd_device *device;
194 struct ccw_device *cdev;
195
196 device = (struct dasd_device *) cqr->device;
197 if (irb->scsw.cstat == 0x00 &&
198 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
199 return dasd_era_none;
200
201 cdev = device->cdev;
202 switch (cdev->id.dev_type) {
203 case 0x3370:
204 return dasd_3370_erp_examine(cqr, irb);
205 case 0x9336:
206 return dasd_9336_erp_examine(cqr, irb);
207 default:
208 return dasd_era_recover;
209 }
210 }
211
212 static dasd_erp_fn_t
213 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
214 {
215 return dasd_default_erp_action;
216 }
217
218 static dasd_erp_fn_t
219 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
220 {
221 if (cqr->function == dasd_default_erp_action)
222 return dasd_default_erp_postaction;
223
224 DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
225 cqr->function);
226 return NULL;
227 }
228
229 static struct dasd_ccw_req *
230 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
231 {
232 struct dasd_fba_private *private;
233 unsigned long *idaws;
234 struct LO_fba_data *LO_data;
235 struct dasd_ccw_req *cqr;
236 struct ccw1 *ccw;
237 struct req_iterator iter;
238 struct bio_vec *bv;
239 char *dst;
240 int count, cidaw, cplength, datasize;
241 sector_t recid, first_rec, last_rec;
242 unsigned int blksize, off;
243 unsigned char cmd;
244
245 private = (struct dasd_fba_private *) device->private;
246 if (rq_data_dir(req) == READ) {
247 cmd = DASD_FBA_CCW_READ;
248 } else if (rq_data_dir(req) == WRITE) {
249 cmd = DASD_FBA_CCW_WRITE;
250 } else
251 return ERR_PTR(-EINVAL);
252 blksize = device->bp_block;
253 /* Calculate record id of first and last block. */
254 first_rec = req->sector >> device->s2b_shift;
255 last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
256 /* Check struct bio and count the number of blocks for the request. */
257 count = 0;
258 cidaw = 0;
259 rq_for_each_segment(bv, req, iter) {
260 if (bv->bv_len & (blksize - 1))
261 /* Fba can only do full blocks. */
262 return ERR_PTR(-EINVAL);
263 count += bv->bv_len >> (device->s2b_shift + 9);
264 #if defined(CONFIG_64BIT)
265 if (idal_is_needed (page_address(bv->bv_page),
266 bv->bv_len))
267 cidaw += bv->bv_len / blksize;
268 #endif
269 }
270 /* Paranoia. */
271 if (count != last_rec - first_rec + 1)
272 return ERR_PTR(-EINVAL);
273 /* 1x define extent + 1x locate record + number of blocks */
274 cplength = 2 + count;
275 /* 1x define extent + 1x locate record */
276 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
277 cidaw * sizeof(unsigned long);
278 /*
279 * Find out number of additional locate record ccws if the device
280 * can't do data chaining.
281 */
282 if (private->rdc_data.mode.bits.data_chain == 0) {
283 cplength += count - 1;
284 datasize += (count - 1)*sizeof(struct LO_fba_data);
285 }
286 /* Allocate the ccw request. */
287 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
288 cplength, datasize, device);
289 if (IS_ERR(cqr))
290 return cqr;
291 ccw = cqr->cpaddr;
292 /* First ccw is define extent. */
293 define_extent(ccw++, cqr->data, rq_data_dir(req),
294 device->bp_block, req->sector, req->nr_sectors);
295 /* Build locate_record + read/write ccws. */
296 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
297 LO_data = (struct LO_fba_data *) (idaws + cidaw);
298 /* Locate record for all blocks for smart devices. */
299 if (private->rdc_data.mode.bits.data_chain != 0) {
300 ccw[-1].flags |= CCW_FLAG_CC;
301 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
302 }
303 recid = first_rec;
304 rq_for_each_segment(bv, req, iter) {
305 dst = page_address(bv->bv_page) + bv->bv_offset;
306 if (dasd_page_cache) {
307 char *copy = kmem_cache_alloc(dasd_page_cache,
308 GFP_DMA | __GFP_NOWARN);
309 if (copy && rq_data_dir(req) == WRITE)
310 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
311 if (copy)
312 dst = copy + bv->bv_offset;
313 }
314 for (off = 0; off < bv->bv_len; off += blksize) {
315 /* Locate record for stupid devices. */
316 if (private->rdc_data.mode.bits.data_chain == 0) {
317 ccw[-1].flags |= CCW_FLAG_CC;
318 locate_record(ccw, LO_data++,
319 rq_data_dir(req),
320 recid - first_rec, 1);
321 ccw->flags = CCW_FLAG_CC;
322 ccw++;
323 } else {
324 if (recid > first_rec)
325 ccw[-1].flags |= CCW_FLAG_DC;
326 else
327 ccw[-1].flags |= CCW_FLAG_CC;
328 }
329 ccw->cmd_code = cmd;
330 ccw->count = device->bp_block;
331 if (idal_is_needed(dst, blksize)) {
332 ccw->cda = (__u32)(addr_t) idaws;
333 ccw->flags = CCW_FLAG_IDA;
334 idaws = idal_create_words(idaws, dst, blksize);
335 } else {
336 ccw->cda = (__u32)(addr_t) dst;
337 ccw->flags = 0;
338 }
339 ccw++;
340 dst += blksize;
341 recid++;
342 }
343 }
344 if (req->cmd_flags & REQ_FAILFAST)
345 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
346 cqr->device = device;
347 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
348 cqr->retries = 32;
349 cqr->buildclk = get_clock();
350 cqr->status = DASD_CQR_FILLED;
351 return cqr;
352 }
353
354 static int
355 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
356 {
357 struct dasd_fba_private *private;
358 struct ccw1 *ccw;
359 struct req_iterator iter;
360 struct bio_vec *bv;
361 char *dst, *cda;
362 unsigned int blksize, off;
363 int status;
364
365 if (!dasd_page_cache)
366 goto out;
367 private = (struct dasd_fba_private *) cqr->device->private;
368 blksize = cqr->device->bp_block;
369 ccw = cqr->cpaddr;
370 /* Skip over define extent & locate record. */
371 ccw++;
372 if (private->rdc_data.mode.bits.data_chain != 0)
373 ccw++;
374 rq_for_each_segment(bv, req, iter) {
375 dst = page_address(bv->bv_page) + bv->bv_offset;
376 for (off = 0; off < bv->bv_len; off += blksize) {
377 /* Skip locate record. */
378 if (private->rdc_data.mode.bits.data_chain == 0)
379 ccw++;
380 if (dst) {
381 if (ccw->flags & CCW_FLAG_IDA)
382 cda = *((char **)((addr_t) ccw->cda));
383 else
384 cda = (char *)((addr_t) ccw->cda);
385 if (dst != cda) {
386 if (rq_data_dir(req) == READ)
387 memcpy(dst, cda, bv->bv_len);
388 kmem_cache_free(dasd_page_cache,
389 (void *)((addr_t)cda & PAGE_MASK));
390 }
391 dst = NULL;
392 }
393 ccw++;
394 }
395 }
396 out:
397 status = cqr->status == DASD_CQR_DONE;
398 dasd_sfree_request(cqr, cqr->device);
399 return status;
400 }
401
402 static int
403 dasd_fba_fill_info(struct dasd_device * device,
404 struct dasd_information2_t * info)
405 {
406 info->label_block = 1;
407 info->FBA_layout = 1;
408 info->format = DASD_FORMAT_LDL;
409 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
410 memcpy(info->characteristics,
411 &((struct dasd_fba_private *) device->private)->rdc_data,
412 sizeof (struct dasd_fba_characteristics));
413 info->confdata_size = 0;
414 return 0;
415 }
416
417 static void
418 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
419 struct irb *irb)
420 {
421 char *page;
422 struct ccw1 *act, *end, *last;
423 int len, sl, sct, count;
424
425 page = (char *) get_zeroed_page(GFP_ATOMIC);
426 if (page == NULL) {
427 DEV_MESSAGE(KERN_ERR, device, " %s",
428 "No memory to dump sense data");
429 return;
430 }
431 len = sprintf(page, KERN_ERR PRINTK_HEADER
432 " I/O status report for device %s:\n",
433 device->cdev->dev.bus_id);
434 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
435 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
436 irb->scsw.cstat, irb->scsw.dstat);
437 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
438 " device %s: Failing CCW: %p\n",
439 device->cdev->dev.bus_id,
440 (void *) (addr_t) irb->scsw.cpa);
441 if (irb->esw.esw0.erw.cons) {
442 for (sl = 0; sl < 4; sl++) {
443 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
444 " Sense(hex) %2d-%2d:",
445 (8 * sl), ((8 * sl) + 7));
446
447 for (sct = 0; sct < 8; sct++) {
448 len += sprintf(page + len, " %02x",
449 irb->ecw[8 * sl + sct]);
450 }
451 len += sprintf(page + len, "\n");
452 }
453 } else {
454 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
455 " SORRY - NO VALID SENSE AVAILABLE\n");
456 }
457 MESSAGE_LOG(KERN_ERR, "%s",
458 page + sizeof(KERN_ERR PRINTK_HEADER));
459
460 /* dump the Channel Program */
461 /* print first CCWs (maximum 8) */
462 act = req->cpaddr;
463 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
464 end = min(act + 8, last);
465 len = sprintf(page, KERN_ERR PRINTK_HEADER
466 " Related CP in req: %p\n", req);
467 while (act <= end) {
468 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
469 " CCW %p: %08X %08X DAT:",
470 act, ((int *) act)[0], ((int *) act)[1]);
471 for (count = 0; count < 32 && count < act->count;
472 count += sizeof(int))
473 len += sprintf(page + len, " %08X",
474 ((int *) (addr_t) act->cda)
475 [(count>>2)]);
476 len += sprintf(page + len, "\n");
477 act++;
478 }
479 MESSAGE_LOG(KERN_ERR, "%s",
480 page + sizeof(KERN_ERR PRINTK_HEADER));
481
482
483 /* print failing CCW area */
484 len = 0;
485 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
486 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
487 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
488 }
489 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
490 while (act <= end) {
491 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
492 " CCW %p: %08X %08X DAT:",
493 act, ((int *) act)[0], ((int *) act)[1]);
494 for (count = 0; count < 32 && count < act->count;
495 count += sizeof(int))
496 len += sprintf(page + len, " %08X",
497 ((int *) (addr_t) act->cda)
498 [(count>>2)]);
499 len += sprintf(page + len, "\n");
500 act++;
501 }
502
503 /* print last CCWs */
504 if (act < last - 2) {
505 act = last - 2;
506 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
507 }
508 while (act <= last) {
509 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
510 " CCW %p: %08X %08X DAT:",
511 act, ((int *) act)[0], ((int *) act)[1]);
512 for (count = 0; count < 32 && count < act->count;
513 count += sizeof(int))
514 len += sprintf(page + len, " %08X",
515 ((int *) (addr_t) act->cda)
516 [(count>>2)]);
517 len += sprintf(page + len, "\n");
518 act++;
519 }
520 if (len > 0)
521 MESSAGE_LOG(KERN_ERR, "%s",
522 page + sizeof(KERN_ERR PRINTK_HEADER));
523 free_page((unsigned long) page);
524 }
525
526 /*
527 * max_blocks is dependent on the amount of storage that is available
528 * in the static io buffer for each device. Currently each device has
529 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
530 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
531 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
532 * addition we have one define extent ccw + 16 bytes of data and a
533 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
534 * That makes:
535 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
536 * We want to fit two into the available memory so that we can immediately
537 * start the next request if one finishes off. That makes 100.1 blocks
538 * for one request. Give a little safety and the result is 96.
539 */
540 static struct dasd_discipline dasd_fba_discipline = {
541 .owner = THIS_MODULE,
542 .name = "FBA ",
543 .ebcname = "FBA ",
544 .max_blocks = 96,
545 .check_device = dasd_fba_check_characteristics,
546 .do_analysis = dasd_fba_do_analysis,
547 .fill_geometry = dasd_fba_fill_geometry,
548 .start_IO = dasd_start_IO,
549 .term_IO = dasd_term_IO,
550 .examine_error = dasd_fba_examine_error,
551 .erp_action = dasd_fba_erp_action,
552 .erp_postaction = dasd_fba_erp_postaction,
553 .build_cp = dasd_fba_build_cp,
554 .free_cp = dasd_fba_free_cp,
555 .dump_sense = dasd_fba_dump_sense,
556 .fill_info = dasd_fba_fill_info,
557 };
558
559 static int __init
560 dasd_fba_init(void)
561 {
562 ASCEBC(dasd_fba_discipline.ebcname, 4);
563 return ccw_driver_register(&dasd_fba_driver);
564 }
565
566 static void __exit
567 dasd_fba_cleanup(void)
568 {
569 ccw_driver_unregister(&dasd_fba_driver);
570 }
571
572 module_init(dasd_fba_init);
573 module_exit(dasd_fba_cleanup);
Linux kernel - Deliverables
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