?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] W1: w1_netlink: New init/fini netlink callbacks.
[linux-2.6/verdex.git] / drivers / s390 / block / dasd_fba.c
blob28cb4613b7f597a0bc5364c6dc211d60c0b70702
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 * $Revision: 1.40 $
8 */
9
10 #include <linux/config.h>
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <asm/debug.h>
14
15 #include <linux/slab.h>
16 #include <linux/hdreg.h> /* HDIO_GETGEO */
17 #include <linux/bio.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20
21 #include <asm/idals.h>
22 #include <asm/ebcdic.h>
23 #include <asm/io.h>
24 #include <asm/todclk.h>
25 #include <asm/ccwdev.h>
26
27 #include "dasd_int.h"
28 #include "dasd_fba.h"
29
30 #ifdef PRINTK_HEADER
31 #undef PRINTK_HEADER
32 #endif /* PRINTK_HEADER */
33 #define PRINTK_HEADER "dasd(fba):"
34
35 #define DASD_FBA_CCW_WRITE 0x41
36 #define DASD_FBA_CCW_READ 0x42
37 #define DASD_FBA_CCW_LOCATE 0x43
38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
39
40 MODULE_LICENSE("GPL");
41
42 static struct dasd_discipline dasd_fba_discipline;
43
44 struct dasd_fba_private {
45 struct dasd_fba_characteristics rdc_data;
46 };
47
48 static struct ccw_device_id dasd_fba_ids[] = {
49 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
50 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
51 { /* end of list */ },
52 };
53
54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
55
56 static struct ccw_driver dasd_fba_driver; /* see below */
57 static int
58 dasd_fba_probe(struct ccw_device *cdev)
59 {
60 int ret;
61
62 ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
63 if (ret)
64 return ret;
65 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
66 return 0;
67 }
68
69 static int
70 dasd_fba_set_online(struct ccw_device *cdev)
71 {
72 return dasd_generic_set_online (cdev, &dasd_fba_discipline);
73 }
74
75 static struct ccw_driver dasd_fba_driver = {
76 .name = "dasd-fba",
77 .owner = THIS_MODULE,
78 .ids = dasd_fba_ids,
79 .probe = dasd_fba_probe,
80 .remove = dasd_generic_remove,
81 .set_offline = dasd_generic_set_offline,
82 .set_online = dasd_fba_set_online,
83 .notify = dasd_generic_notify,
84 };
85
86 static inline void
87 define_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
106 static inline void
107 locate_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
125 static int
126 dasd_fba_check_characteristics(struct dasd_device *device)
127 {
128 struct dasd_fba_private *private;
129 struct ccw_device *cdev = device->cdev;
130 void *rdc_data;
131 int rc;
132
133 private = (struct dasd_fba_private *) device->private;
134 if (private == NULL) {
135 private = kmalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
136 if (private == NULL) {
137 DEV_MESSAGE(KERN_WARNING, device, "%s",
138 "memory allocation failed for private "
139 "data");
140 return -ENOMEM;
141 }
142 device->private = (void *) private;
143 }
144 /* Read Device Characteristics */
145 rdc_data = (void *) &(private->rdc_data);
146 rc = read_dev_chars(device->cdev, &rdc_data, 32);
147 if (rc) {
148 DEV_MESSAGE(KERN_WARNING, device,
149 "Read device characteristics returned error %d",
150 rc);
151 return rc;
152 }
153
154 DEV_MESSAGE(KERN_INFO, device,
155 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
156 cdev->id.dev_type,
157 cdev->id.dev_model,
158 cdev->id.cu_type,
159 cdev->id.cu_model,
160 ((private->rdc_data.blk_bdsa *
161 (private->rdc_data.blk_size >> 9)) >> 11),
162 private->rdc_data.blk_size);
163 return 0;
164 }
165
166 static int
167 dasd_fba_do_analysis(struct dasd_device *device)
168 {
169 struct dasd_fba_private *private;
170 int sb, rc;
171
172 private = (struct dasd_fba_private *) device->private;
173 rc = dasd_check_blocksize(private->rdc_data.blk_size);
174 if (rc) {
175 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
176 private->rdc_data.blk_size);
177 return rc;
178 }
179 device->blocks = private->rdc_data.blk_bdsa;
180 device->bp_block = private->rdc_data.blk_size;
181 device->s2b_shift = 0; /* bits to shift 512 to get a block */
182 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
183 device->s2b_shift++;
184 return 0;
185 }
186
187 static int
188 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
189 {
190 if (dasd_check_blocksize(device->bp_block) != 0)
191 return -EINVAL;
192 geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
193 geo->heads = 16;
194 geo->sectors = 128 >> device->s2b_shift;
195 return 0;
196 }
197
198 static dasd_era_t
199 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
200 {
201 struct dasd_device *device;
202 struct ccw_device *cdev;
203
204 device = (struct dasd_device *) cqr->device;
205 if (irb->scsw.cstat == 0x00 &&
206 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
207 return dasd_era_none;
208
209 cdev = device->cdev;
210 switch (cdev->id.dev_type) {
211 case 0x3370:
212 return dasd_3370_erp_examine(cqr, irb);
213 case 0x9336:
214 return dasd_9336_erp_examine(cqr, irb);
215 default:
216 return dasd_era_recover;
217 }
218 }
219
220 static dasd_erp_fn_t
221 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
222 {
223 return dasd_default_erp_action;
224 }
225
226 static dasd_erp_fn_t
227 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
228 {
229 if (cqr->function == dasd_default_erp_action)
230 return dasd_default_erp_postaction;
231
232 DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
233 cqr->function);
234 return NULL;
235 }
236
237 static struct dasd_ccw_req *
238 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
239 {
240 struct dasd_fba_private *private;
241 unsigned long *idaws;
242 struct LO_fba_data *LO_data;
243 struct dasd_ccw_req *cqr;
244 struct ccw1 *ccw;
245 struct bio *bio;
246 struct bio_vec *bv;
247 char *dst;
248 int count, cidaw, cplength, datasize;
249 sector_t recid, first_rec, last_rec;
250 unsigned int blksize, off;
251 unsigned char cmd;
252 int i;
253
254 private = (struct dasd_fba_private *) device->private;
255 if (rq_data_dir(req) == READ) {
256 cmd = DASD_FBA_CCW_READ;
257 } else if (rq_data_dir(req) == WRITE) {
258 cmd = DASD_FBA_CCW_WRITE;
259 } else
260 return ERR_PTR(-EINVAL);
261 blksize = device->bp_block;
262 /* Calculate record id of first and last block. */
263 first_rec = req->sector >> device->s2b_shift;
264 last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
265 /* Check struct bio and count the number of blocks for the request. */
266 count = 0;
267 cidaw = 0;
268 rq_for_each_bio(bio, req) {
269 bio_for_each_segment(bv, bio, i) {
270 if (bv->bv_len & (blksize - 1))
271 /* Fba can only do full blocks. */
272 return ERR_PTR(-EINVAL);
273 count += bv->bv_len >> (device->s2b_shift + 9);
274 #if defined(CONFIG_ARCH_S390X)
275 if (idal_is_needed (page_address(bv->bv_page),
276 bv->bv_len))
277 cidaw += bv->bv_len / blksize;
278 #endif
279 }
280 }
281 /* Paranoia. */
282 if (count != last_rec - first_rec + 1)
283 return ERR_PTR(-EINVAL);
284 /* 1x define extent + 1x locate record + number of blocks */
285 cplength = 2 + count;
286 /* 1x define extent + 1x locate record */
287 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
288 cidaw * sizeof(unsigned long);
289 /*
290 * Find out number of additional locate record ccws if the device
291 * can't do data chaining.
292 */
293 if (private->rdc_data.mode.bits.data_chain == 0) {
294 cplength += count - 1;
295 datasize += (count - 1)*sizeof(struct LO_fba_data);
296 }
297 /* Allocate the ccw request. */
298 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
299 cplength, datasize, device);
300 if (IS_ERR(cqr))
301 return cqr;
302 ccw = cqr->cpaddr;
303 /* First ccw is define extent. */
304 define_extent(ccw++, cqr->data, rq_data_dir(req),
305 device->bp_block, req->sector, req->nr_sectors);
306 /* Build locate_record + read/write ccws. */
307 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
308 LO_data = (struct LO_fba_data *) (idaws + cidaw);
309 /* Locate record for all blocks for smart devices. */
310 if (private->rdc_data.mode.bits.data_chain != 0) {
311 ccw[-1].flags |= CCW_FLAG_CC;
312 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
313 }
314 recid = first_rec;
315 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
316 dst = page_address(bv->bv_page) + bv->bv_offset;
317 if (dasd_page_cache) {
318 char *copy = kmem_cache_alloc(dasd_page_cache,
319 SLAB_DMA | __GFP_NOWARN);
320 if (copy && rq_data_dir(req) == WRITE)
321 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
322 if (copy)
323 dst = copy + bv->bv_offset;
324 }
325 for (off = 0; off < bv->bv_len; off += blksize) {
326 /* Locate record for stupid devices. */
327 if (private->rdc_data.mode.bits.data_chain == 0) {
328 ccw[-1].flags |= CCW_FLAG_CC;
329 locate_record(ccw, LO_data++,
330 rq_data_dir(req),
331 recid - first_rec, 1);
332 ccw->flags = CCW_FLAG_CC;
333 ccw++;
334 } else {
335 if (recid > first_rec)
336 ccw[-1].flags |= CCW_FLAG_DC;
337 else
338 ccw[-1].flags |= CCW_FLAG_CC;
339 }
340 ccw->cmd_code = cmd;
341 ccw->count = device->bp_block;
342 if (idal_is_needed(dst, blksize)) {
343 ccw->cda = (__u32)(addr_t) idaws;
344 ccw->flags = CCW_FLAG_IDA;
345 idaws = idal_create_words(idaws, dst, blksize);
346 } else {
347 ccw->cda = (__u32)(addr_t) dst;
348 ccw->flags = 0;
349 }
350 ccw++;
351 dst += blksize;
352 recid++;
353 }
354 }
355 cqr->device = device;
356 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
357 cqr->retries = 32;
358 cqr->buildclk = get_clock();
359 cqr->status = DASD_CQR_FILLED;
360 return cqr;
361 }
362
363 static int
364 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
365 {
366 struct dasd_fba_private *private;
367 struct ccw1 *ccw;
368 struct bio *bio;
369 struct bio_vec *bv;
370 char *dst, *cda;
371 unsigned int blksize, off;
372 int i, status;
373
374 if (!dasd_page_cache)
375 goto out;
376 private = (struct dasd_fba_private *) cqr->device->private;
377 blksize = cqr->device->bp_block;
378 ccw = cqr->cpaddr;
379 /* Skip over define extent & locate record. */
380 ccw++;
381 if (private->rdc_data.mode.bits.data_chain != 0)
382 ccw++;
383 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
384 dst = page_address(bv->bv_page) + bv->bv_offset;
385 for (off = 0; off < bv->bv_len; off += blksize) {
386 /* Skip locate record. */
387 if (private->rdc_data.mode.bits.data_chain == 0)
388 ccw++;
389 if (dst) {
390 if (ccw->flags & CCW_FLAG_IDA)
391 cda = *((char **)((addr_t) ccw->cda));
392 else
393 cda = (char *)((addr_t) ccw->cda);
394 if (dst != cda) {
395 if (rq_data_dir(req) == READ)
396 memcpy(dst, cda, bv->bv_len);
397 kmem_cache_free(dasd_page_cache,
398 (void *)((addr_t)cda & PAGE_MASK));
399 }
400 dst = NULL;
401 }
402 ccw++;
403 }
404 }
405 out:
406 status = cqr->status == DASD_CQR_DONE;
407 dasd_sfree_request(cqr, cqr->device);
408 return status;
409 }
410
411 static int
412 dasd_fba_fill_info(struct dasd_device * device,
413 struct dasd_information2_t * info)
414 {
415 info->label_block = 1;
416 info->FBA_layout = 1;
417 info->format = DASD_FORMAT_LDL;
418 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
419 memcpy(info->characteristics,
420 &((struct dasd_fba_private *) device->private)->rdc_data,
421 sizeof (struct dasd_fba_characteristics));
422 info->confdata_size = 0;
423 return 0;
424 }
425
426 static void
427 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
428 struct irb *irb)
429 {
430 char *page;
431 struct ccw1 *act, *end, *last;
432 int len, sl, sct, count;
433
434 page = (char *) get_zeroed_page(GFP_ATOMIC);
435 if (page == NULL) {
436 DEV_MESSAGE(KERN_ERR, device, " %s",
437 "No memory to dump sense data");
438 return;
439 }
440 len = sprintf(page, KERN_ERR PRINTK_HEADER
441 " I/O status report for device %s:\n",
442 device->cdev->dev.bus_id);
443 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
444 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
445 irb->scsw.cstat, irb->scsw.dstat);
446 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
447 " device %s: Failing CCW: %p\n",
448 device->cdev->dev.bus_id,
449 (void *) (addr_t) irb->scsw.cpa);
450 if (irb->esw.esw0.erw.cons) {
451 for (sl = 0; sl < 4; sl++) {
452 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
453 " Sense(hex) %2d-%2d:",
454 (8 * sl), ((8 * sl) + 7));
455
456 for (sct = 0; sct < 8; sct++) {
457 len += sprintf(page + len, " %02x",
458 irb->ecw[8 * sl + sct]);
459 }
460 len += sprintf(page + len, "\n");
461 }
462 } else {
463 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
464 " SORRY - NO VALID SENSE AVAILABLE\n");
465 }
466 MESSAGE_LOG(KERN_ERR, "%s",
467 page + sizeof(KERN_ERR PRINTK_HEADER));
468
469 /* dump the Channel Program */
470 /* print first CCWs (maximum 8) */
471 act = req->cpaddr;
472 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
473 end = min(act + 8, last);
474 len = sprintf(page, KERN_ERR PRINTK_HEADER
475 " Related CP in req: %p\n", req);
476 while (act <= end) {
477 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
478 " CCW %p: %08X %08X DAT:",
479 act, ((int *) act)[0], ((int *) act)[1]);
480 for (count = 0; count < 32 && count < act->count;
481 count += sizeof(int))
482 len += sprintf(page + len, " %08X",
483 ((int *) (addr_t) act->cda)
484 [(count>>2)]);
485 len += sprintf(page + len, "\n");
486 act++;
487 }
488 MESSAGE_LOG(KERN_ERR, "%s",
489 page + sizeof(KERN_ERR PRINTK_HEADER));
490
491
492 /* print failing CCW area */
493 len = 0;
494 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
495 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
496 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
497 }
498 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
499 while (act <= end) {
500 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
501 " CCW %p: %08X %08X DAT:",
502 act, ((int *) act)[0], ((int *) act)[1]);
503 for (count = 0; count < 32 && count < act->count;
504 count += sizeof(int))
505 len += sprintf(page + len, " %08X",
506 ((int *) (addr_t) act->cda)
507 [(count>>2)]);
508 len += sprintf(page + len, "\n");
509 act++;
510 }
511
512 /* print last CCWs */
513 if (act < last - 2) {
514 act = last - 2;
515 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
516 }
517 while (act <= last) {
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 if (len > 0)
530 MESSAGE_LOG(KERN_ERR, "%s",
531 page + sizeof(KERN_ERR PRINTK_HEADER));
532 free_page((unsigned long) page);
533 }
534
535 /*
536 * max_blocks is dependent on the amount of storage that is available
537 * in the static io buffer for each device. Currently each device has
538 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
539 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
540 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
541 * addition we have one define extent ccw + 16 bytes of data and a
542 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
543 * That makes:
544 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
545 * We want to fit two into the available memory so that we can immediately
546 * start the next request if one finishes off. That makes 100.1 blocks
547 * for one request. Give a little safety and the result is 96.
548 */
549 static struct dasd_discipline dasd_fba_discipline = {
550 .owner = THIS_MODULE,
551 .name = "FBA ",
552 .ebcname = "FBA ",
553 .max_blocks = 96,
554 .check_device = dasd_fba_check_characteristics,
555 .do_analysis = dasd_fba_do_analysis,
556 .fill_geometry = dasd_fba_fill_geometry,
557 .start_IO = dasd_start_IO,
558 .term_IO = dasd_term_IO,
559 .examine_error = dasd_fba_examine_error,
560 .erp_action = dasd_fba_erp_action,
561 .erp_postaction = dasd_fba_erp_postaction,
562 .build_cp = dasd_fba_build_cp,
563 .free_cp = dasd_fba_free_cp,
564 .dump_sense = dasd_fba_dump_sense,
565 .fill_info = dasd_fba_fill_info,
566 };
567
568 static int __init
569 dasd_fba_init(void)
570 {
571 int ret;
572
573 ASCEBC(dasd_fba_discipline.ebcname, 4);
574
575 ret = ccw_driver_register(&dasd_fba_driver);
576 if (ret)
577 return ret;
578
579 dasd_generic_auto_online(&dasd_fba_driver);
580 return 0;
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);
591
592 /*
593 * Overrides for Emacs so that we follow Linus's tabbing style.
594 * Emacs will notice this stuff at the end of the file and automatically
595 * adjust the settings for this buffer only. This must remain at the end
596 * of the file.
597 * ---------------------------------------------------------------------------
598 * Local variables:
599 * c-indent-level: 4
600 * c-brace-imaginary-offset: 0
601 * c-brace-offset: -4
602 * c-argdecl-indent: 4
603 * c-label-offset: -4
604 * c-continued-statement-offset: 4
605 * c-continued-brace-offset: 0
606 * indent-tabs-mode: 1
607 * tab-width: 8
608 * End:
609 */
Verdex Pro support