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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / s390 / block / dasd_fba.c
blob7963ae343eef84f10798af7d529084f91480f5fa
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: 1.39 $
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->status = DASD_CQR_FILLED;
358 return cqr;
359 }
360
361 static int
362 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
363 {
364 struct dasd_fba_private *private;
365 struct ccw1 *ccw;
366 struct bio *bio;
367 struct bio_vec *bv;
368 char *dst, *cda;
369 unsigned int blksize, off;
370 int i, status;
371
372 if (!dasd_page_cache)
373 goto out;
374 private = (struct dasd_fba_private *) cqr->device->private;
375 blksize = cqr->device->bp_block;
376 ccw = cqr->cpaddr;
377 /* Skip over define extent & locate record. */
378 ccw++;
379 if (private->rdc_data.mode.bits.data_chain != 0)
380 ccw++;
381 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
382 dst = page_address(bv->bv_page) + bv->bv_offset;
383 for (off = 0; off < bv->bv_len; off += blksize) {
384 /* Skip locate record. */
385 if (private->rdc_data.mode.bits.data_chain == 0)
386 ccw++;
387 if (dst) {
388 if (ccw->flags & CCW_FLAG_IDA)
389 cda = *((char **)((addr_t) ccw->cda));
390 else
391 cda = (char *)((addr_t) ccw->cda);
392 if (dst != cda) {
393 if (rq_data_dir(req) == READ)
394 memcpy(dst, cda, bv->bv_len);
395 kmem_cache_free(dasd_page_cache,
396 (void *)((addr_t)cda & PAGE_MASK));
397 }
398 dst = NULL;
399 }
400 ccw++;
401 }
402 }
403 out:
404 status = cqr->status == DASD_CQR_DONE;
405 dasd_sfree_request(cqr, cqr->device);
406 return status;
407 }
408
409 static int
410 dasd_fba_fill_info(struct dasd_device * device,
411 struct dasd_information2_t * info)
412 {
413 info->label_block = 1;
414 info->FBA_layout = 1;
415 info->format = DASD_FORMAT_LDL;
416 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
417 memcpy(info->characteristics,
418 &((struct dasd_fba_private *) device->private)->rdc_data,
419 sizeof (struct dasd_fba_characteristics));
420 info->confdata_size = 0;
421 return 0;
422 }
423
424 static void
425 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
426 struct irb *irb)
427 {
428 char *page;
429 struct ccw1 *act, *end, *last;
430 int len, sl, sct, count;
431
432 page = (char *) get_zeroed_page(GFP_ATOMIC);
433 if (page == NULL) {
434 DEV_MESSAGE(KERN_ERR, device, " %s",
435 "No memory to dump sense data");
436 return;
437 }
438 len = sprintf(page, KERN_ERR PRINTK_HEADER
439 " I/O status report for device %s:\n",
440 device->cdev->dev.bus_id);
441 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
442 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
443 irb->scsw.cstat, irb->scsw.dstat);
444 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
445 " device %s: Failing CCW: %p\n",
446 device->cdev->dev.bus_id,
447 (void *) (addr_t) irb->scsw.cpa);
448 if (irb->esw.esw0.erw.cons) {
449 for (sl = 0; sl < 4; sl++) {
450 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
451 " Sense(hex) %2d-%2d:",
452 (8 * sl), ((8 * sl) + 7));
453
454 for (sct = 0; sct < 8; sct++) {
455 len += sprintf(page + len, " %02x",
456 irb->ecw[8 * sl + sct]);
457 }
458 len += sprintf(page + len, "\n");
459 }
460 } else {
461 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
462 " SORRY - NO VALID SENSE AVAILABLE\n");
463 }
464 MESSAGE_LOG(KERN_ERR, "%s",
465 page + sizeof(KERN_ERR PRINTK_HEADER));
466
467 /* dump the Channel Program */
468 /* print first CCWs (maximum 8) */
469 act = req->cpaddr;
470 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
471 end = min(act + 8, last);
472 len = sprintf(page, KERN_ERR PRINTK_HEADER
473 " Related CP in req: %p\n", req);
474 while (act <= end) {
475 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
476 " CCW %p: %08X %08X DAT:",
477 act, ((int *) act)[0], ((int *) act)[1]);
478 for (count = 0; count < 32 && count < act->count;
479 count += sizeof(int))
480 len += sprintf(page + len, " %08X",
481 ((int *) (addr_t) act->cda)
482 [(count>>2)]);
483 len += sprintf(page + len, "\n");
484 act++;
485 }
486 MESSAGE_LOG(KERN_ERR, "%s",
487 page + sizeof(KERN_ERR PRINTK_HEADER));
488
489
490 /* print failing CCW area */
491 len = 0;
492 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
493 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
494 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
495 }
496 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
497 while (act <= end) {
498 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
499 " CCW %p: %08X %08X DAT:",
500 act, ((int *) act)[0], ((int *) act)[1]);
501 for (count = 0; count < 32 && count < act->count;
502 count += sizeof(int))
503 len += sprintf(page + len, " %08X",
504 ((int *) (addr_t) act->cda)
505 [(count>>2)]);
506 len += sprintf(page + len, "\n");
507 act++;
508 }
509
510 /* print last CCWs */
511 if (act < last - 2) {
512 act = last - 2;
513 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
514 }
515 while (act <= last) {
516 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
517 " CCW %p: %08X %08X DAT:",
518 act, ((int *) act)[0], ((int *) act)[1]);
519 for (count = 0; count < 32 && count < act->count;
520 count += sizeof(int))
521 len += sprintf(page + len, " %08X",
522 ((int *) (addr_t) act->cda)
523 [(count>>2)]);
524 len += sprintf(page + len, "\n");
525 act++;
526 }
527 if (len > 0)
528 MESSAGE_LOG(KERN_ERR, "%s",
529 page + sizeof(KERN_ERR PRINTK_HEADER));
530 free_page((unsigned long) page);
531 }
532
533 /*
534 * max_blocks is dependent on the amount of storage that is available
535 * in the static io buffer for each device. Currently each device has
536 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
537 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
538 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
539 * addition we have one define extent ccw + 16 bytes of data and a
540 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
541 * That makes:
542 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
543 * We want to fit two into the available memory so that we can immediately
544 * start the next request if one finishes off. That makes 100.1 blocks
545 * for one request. Give a little safety and the result is 96.
546 */
547 static struct dasd_discipline dasd_fba_discipline = {
548 .owner = THIS_MODULE,
549 .name = "FBA ",
550 .ebcname = "FBA ",
551 .max_blocks = 96,
552 .check_device = dasd_fba_check_characteristics,
553 .do_analysis = dasd_fba_do_analysis,
554 .fill_geometry = dasd_fba_fill_geometry,
555 .start_IO = dasd_start_IO,
556 .term_IO = dasd_term_IO,
557 .examine_error = dasd_fba_examine_error,
558 .erp_action = dasd_fba_erp_action,
559 .erp_postaction = dasd_fba_erp_postaction,
560 .build_cp = dasd_fba_build_cp,
561 .free_cp = dasd_fba_free_cp,
562 .dump_sense = dasd_fba_dump_sense,
563 .fill_info = dasd_fba_fill_info,
564 };
565
566 static int __init
567 dasd_fba_init(void)
568 {
569 int ret;
570
571 ASCEBC(dasd_fba_discipline.ebcname, 4);
572
573 ret = ccw_driver_register(&dasd_fba_driver);
574 if (ret)
575 return ret;
576
577 dasd_generic_auto_online(&dasd_fba_driver);
578 return 0;
579 }
580
581 static void __exit
582 dasd_fba_cleanup(void)
583 {
584 ccw_driver_unregister(&dasd_fba_driver);
585 }
586
587 module_init(dasd_fba_init);
588 module_exit(dasd_fba_cleanup);
589
590 /*
591 * Overrides for Emacs so that we follow Linus's tabbing style.
592 * Emacs will notice this stuff at the end of the file and automatically
593 * adjust the settings for this buffer only. This must remain at the end
594 * of the file.
595 * ---------------------------------------------------------------------------
596 * Local variables:
597 * c-indent-level: 4
598 * c-brace-imaginary-offset: 0
599 * c-brace-offset: -4
600 * c-argdecl-indent: 4
601 * c-label-offset: -4
602 * c-continued-statement-offset: 4
603 * c-continued-brace-offset: 0
604 * indent-tabs-mode: 1
605 * tab-width: 8
606 * End:
607 */
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