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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / s390 / block / dasd_fba.c
blobd13ea05089a7c3e2e291034258e072675bef0464
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), GFP_KERNEL);
129 if (private == NULL) {
130 DEV_MESSAGE(KERN_WARNING, device, "%s",
131 "memory allocation failed for private "
132 "data");
133 return -ENOMEM;
134 }
135 device->private = (void *) private;
136 }
137 block = dasd_alloc_block();
138 if (IS_ERR(block)) {
139 DEV_MESSAGE(KERN_WARNING, device, "%s",
140 "could not allocate dasd block structure");
141 kfree(device->private);
142 return PTR_ERR(block);
143 }
144 device->block = block;
145 block->base = device;
146
147 /* Read Device Characteristics */
148 rdc_data = (void *) &(private->rdc_data);
149 rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
150 if (rc) {
151 DEV_MESSAGE(KERN_WARNING, device,
152 "Read device characteristics returned error %d",
153 rc);
154 return rc;
155 }
156
157 DEV_MESSAGE(KERN_INFO, device,
158 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
159 cdev->id.dev_type,
160 cdev->id.dev_model,
161 cdev->id.cu_type,
162 cdev->id.cu_model,
163 ((private->rdc_data.blk_bdsa *
164 (private->rdc_data.blk_size >> 9)) >> 11),
165 private->rdc_data.blk_size);
166 return 0;
167 }
168
169 static int dasd_fba_do_analysis(struct dasd_block *block)
170 {
171 struct dasd_fba_private *private;
172 int sb, rc;
173
174 private = (struct dasd_fba_private *) block->base->private;
175 rc = dasd_check_blocksize(private->rdc_data.blk_size);
176 if (rc) {
177 DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d",
178 private->rdc_data.blk_size);
179 return rc;
180 }
181 block->blocks = private->rdc_data.blk_bdsa;
182 block->bp_block = private->rdc_data.blk_size;
183 block->s2b_shift = 0; /* bits to shift 512 to get a block */
184 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
185 block->s2b_shift++;
186 return 0;
187 }
188
189 static int dasd_fba_fill_geometry(struct dasd_block *block,
190 struct hd_geometry *geo)
191 {
192 if (dasd_check_blocksize(block->bp_block) != 0)
193 return -EINVAL;
194 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
195 geo->heads = 16;
196 geo->sectors = 128 >> block->s2b_shift;
197 return 0;
198 }
199
200 static dasd_erp_fn_t
201 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
202 {
203 return dasd_default_erp_action;
204 }
205
206 static dasd_erp_fn_t
207 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
208 {
209 if (cqr->function == dasd_default_erp_action)
210 return dasd_default_erp_postaction;
211
212 DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
213 cqr->function);
214 return NULL;
215 }
216
217 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
218 struct irb *irb)
219 {
220 char mask;
221
222 /* first of all check for state change pending interrupt */
223 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
224 if ((irb->scsw.dstat & mask) == mask) {
225 dasd_generic_handle_state_change(device);
226 return;
227 }
228
229 /* check for unsolicited interrupts */
230 DEV_MESSAGE(KERN_DEBUG, device, "%s",
231 "unsolicited interrupt received");
232 device->discipline->dump_sense(device, NULL, irb);
233 dasd_schedule_device_bh(device);
234 return;
235 };
236
237 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
238 struct dasd_block *block,
239 struct request *req)
240 {
241 struct dasd_fba_private *private;
242 unsigned long *idaws;
243 struct LO_fba_data *LO_data;
244 struct dasd_ccw_req *cqr;
245 struct ccw1 *ccw;
246 struct req_iterator iter;
247 struct bio_vec *bv;
248 char *dst;
249 int count, cidaw, cplength, datasize;
250 sector_t recid, first_rec, last_rec;
251 unsigned int blksize, off;
252 unsigned char cmd;
253
254 private = (struct dasd_fba_private *) block->base->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 = block->bp_block;
262 /* Calculate record id of first and last block. */
263 first_rec = req->sector >> block->s2b_shift;
264 last_rec = (req->sector + req->nr_sectors - 1) >> block->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_segment(bv, req, iter) {
269 if (bv->bv_len & (blksize - 1))
270 /* Fba can only do full blocks. */
271 return ERR_PTR(-EINVAL);
272 count += bv->bv_len >> (block->s2b_shift + 9);
273 #if defined(CONFIG_64BIT)
274 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
275 cidaw += bv->bv_len / blksize;
276 #endif
277 }
278 /* Paranoia. */
279 if (count != last_rec - first_rec + 1)
280 return ERR_PTR(-EINVAL);
281 /* 1x define extent + 1x locate record + number of blocks */
282 cplength = 2 + count;
283 /* 1x define extent + 1x locate record */
284 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
285 cidaw * sizeof(unsigned long);
286 /*
287 * Find out number of additional locate record ccws if the device
288 * can't do data chaining.
289 */
290 if (private->rdc_data.mode.bits.data_chain == 0) {
291 cplength += count - 1;
292 datasize += (count - 1)*sizeof(struct LO_fba_data);
293 }
294 /* Allocate the ccw request. */
295 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
296 cplength, datasize, memdev);
297 if (IS_ERR(cqr))
298 return cqr;
299 ccw = cqr->cpaddr;
300 /* First ccw is define extent. */
301 define_extent(ccw++, cqr->data, rq_data_dir(req),
302 block->bp_block, req->sector, req->nr_sectors);
303 /* Build locate_record + read/write ccws. */
304 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
305 LO_data = (struct LO_fba_data *) (idaws + cidaw);
306 /* Locate record for all blocks for smart devices. */
307 if (private->rdc_data.mode.bits.data_chain != 0) {
308 ccw[-1].flags |= CCW_FLAG_CC;
309 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
310 }
311 recid = first_rec;
312 rq_for_each_segment(bv, req, iter) {
313 dst = page_address(bv->bv_page) + bv->bv_offset;
314 if (dasd_page_cache) {
315 char *copy = kmem_cache_alloc(dasd_page_cache,
316 GFP_DMA | __GFP_NOWARN);
317 if (copy && rq_data_dir(req) == WRITE)
318 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
319 if (copy)
320 dst = copy + bv->bv_offset;
321 }
322 for (off = 0; off < bv->bv_len; off += blksize) {
323 /* Locate record for stupid devices. */
324 if (private->rdc_data.mode.bits.data_chain == 0) {
325 ccw[-1].flags |= CCW_FLAG_CC;
326 locate_record(ccw, LO_data++,
327 rq_data_dir(req),
328 recid - first_rec, 1);
329 ccw->flags = CCW_FLAG_CC;
330 ccw++;
331 } else {
332 if (recid > first_rec)
333 ccw[-1].flags |= CCW_FLAG_DC;
334 else
335 ccw[-1].flags |= CCW_FLAG_CC;
336 }
337 ccw->cmd_code = cmd;
338 ccw->count = block->bp_block;
339 if (idal_is_needed(dst, blksize)) {
340 ccw->cda = (__u32)(addr_t) idaws;
341 ccw->flags = CCW_FLAG_IDA;
342 idaws = idal_create_words(idaws, dst, blksize);
343 } else {
344 ccw->cda = (__u32)(addr_t) dst;
345 ccw->flags = 0;
346 }
347 ccw++;
348 dst += blksize;
349 recid++;
350 }
351 }
352 if (req->cmd_flags & REQ_FAILFAST)
353 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
354 cqr->startdev = memdev;
355 cqr->memdev = memdev;
356 cqr->block = block;
357 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
358 cqr->retries = 32;
359 cqr->buildclk = get_clock();
360 cqr->status = DASD_CQR_FILLED;
361 return cqr;
362 }
363
364 static int
365 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
366 {
367 struct dasd_fba_private *private;
368 struct ccw1 *ccw;
369 struct req_iterator iter;
370 struct bio_vec *bv;
371 char *dst, *cda;
372 unsigned int blksize, off;
373 int status;
374
375 if (!dasd_page_cache)
376 goto out;
377 private = (struct dasd_fba_private *) cqr->block->base->private;
378 blksize = cqr->block->bp_block;
379 ccw = cqr->cpaddr;
380 /* Skip over define extent & locate record. */
381 ccw++;
382 if (private->rdc_data.mode.bits.data_chain != 0)
383 ccw++;
384 rq_for_each_segment(bv, req, iter) {
385 dst = page_address(bv->bv_page) + bv->bv_offset;
386 for (off = 0; off < bv->bv_len; off += blksize) {
387 /* Skip locate record. */
388 if (private->rdc_data.mode.bits.data_chain == 0)
389 ccw++;
390 if (dst) {
391 if (ccw->flags & CCW_FLAG_IDA)
392 cda = *((char **)((addr_t) ccw->cda));
393 else
394 cda = (char *)((addr_t) ccw->cda);
395 if (dst != cda) {
396 if (rq_data_dir(req) == READ)
397 memcpy(dst, cda, bv->bv_len);
398 kmem_cache_free(dasd_page_cache,
399 (void *)((addr_t)cda & PAGE_MASK));
400 }
401 dst = NULL;
402 }
403 ccw++;
404 }
405 }
406 out:
407 status = cqr->status == DASD_CQR_DONE;
408 dasd_sfree_request(cqr, cqr->memdev);
409 return status;
410 }
411
412 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
413 {
414 cqr->status = DASD_CQR_FILLED;
415 };
416
417 static int
418 dasd_fba_fill_info(struct dasd_device * device,
419 struct dasd_information2_t * info)
420 {
421 info->label_block = 1;
422 info->FBA_layout = 1;
423 info->format = DASD_FORMAT_LDL;
424 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
425 memcpy(info->characteristics,
426 &((struct dasd_fba_private *) device->private)->rdc_data,
427 sizeof (struct dasd_fba_characteristics));
428 info->confdata_size = 0;
429 return 0;
430 }
431
432 static void
433 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
434 struct irb *irb)
435 {
436 char *page;
437 struct ccw1 *act, *end, *last;
438 int len, sl, sct, count;
439
440 page = (char *) get_zeroed_page(GFP_ATOMIC);
441 if (page == NULL) {
442 DEV_MESSAGE(KERN_ERR, device, " %s",
443 "No memory to dump sense data");
444 return;
445 }
446 len = sprintf(page, KERN_ERR PRINTK_HEADER
447 " I/O status report for device %s:\n",
448 device->cdev->dev.bus_id);
449 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
450 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
451 irb->scsw.cstat, irb->scsw.dstat);
452 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
453 " device %s: Failing CCW: %p\n",
454 device->cdev->dev.bus_id,
455 (void *) (addr_t) irb->scsw.cpa);
456 if (irb->esw.esw0.erw.cons) {
457 for (sl = 0; sl < 4; sl++) {
458 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
459 " Sense(hex) %2d-%2d:",
460 (8 * sl), ((8 * sl) + 7));
461
462 for (sct = 0; sct < 8; sct++) {
463 len += sprintf(page + len, " %02x",
464 irb->ecw[8 * sl + sct]);
465 }
466 len += sprintf(page + len, "\n");
467 }
468 } else {
469 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
470 " SORRY - NO VALID SENSE AVAILABLE\n");
471 }
472 MESSAGE_LOG(KERN_ERR, "%s",
473 page + sizeof(KERN_ERR PRINTK_HEADER));
474
475 /* dump the Channel Program */
476 /* print first CCWs (maximum 8) */
477 act = req->cpaddr;
478 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
479 end = min(act + 8, last);
480 len = sprintf(page, KERN_ERR PRINTK_HEADER
481 " Related CP in req: %p\n", req);
482 while (act <= end) {
483 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
484 " CCW %p: %08X %08X DAT:",
485 act, ((int *) act)[0], ((int *) act)[1]);
486 for (count = 0; count < 32 && count < act->count;
487 count += sizeof(int))
488 len += sprintf(page + len, " %08X",
489 ((int *) (addr_t) act->cda)
490 [(count>>2)]);
491 len += sprintf(page + len, "\n");
492 act++;
493 }
494 MESSAGE_LOG(KERN_ERR, "%s",
495 page + sizeof(KERN_ERR PRINTK_HEADER));
496
497
498 /* print failing CCW area */
499 len = 0;
500 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
501 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
502 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
503 }
504 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
505 while (act <= end) {
506 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
507 " CCW %p: %08X %08X DAT:",
508 act, ((int *) act)[0], ((int *) act)[1]);
509 for (count = 0; count < 32 && count < act->count;
510 count += sizeof(int))
511 len += sprintf(page + len, " %08X",
512 ((int *) (addr_t) act->cda)
513 [(count>>2)]);
514 len += sprintf(page + len, "\n");
515 act++;
516 }
517
518 /* print last CCWs */
519 if (act < last - 2) {
520 act = last - 2;
521 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
522 }
523 while (act <= last) {
524 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
525 " CCW %p: %08X %08X DAT:",
526 act, ((int *) act)[0], ((int *) act)[1]);
527 for (count = 0; count < 32 && count < act->count;
528 count += sizeof(int))
529 len += sprintf(page + len, " %08X",
530 ((int *) (addr_t) act->cda)
531 [(count>>2)]);
532 len += sprintf(page + len, "\n");
533 act++;
534 }
535 if (len > 0)
536 MESSAGE_LOG(KERN_ERR, "%s",
537 page + sizeof(KERN_ERR PRINTK_HEADER));
538 free_page((unsigned long) page);
539 }
540
541 /*
542 * max_blocks is dependent on the amount of storage that is available
543 * in the static io buffer for each device. Currently each device has
544 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
545 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
546 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
547 * addition we have one define extent ccw + 16 bytes of data and a
548 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
549 * That makes:
550 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
551 * We want to fit two into the available memory so that we can immediately
552 * start the next request if one finishes off. That makes 100.1 blocks
553 * for one request. Give a little safety and the result is 96.
554 */
555 static struct dasd_discipline dasd_fba_discipline = {
556 .owner = THIS_MODULE,
557 .name = "FBA ",
558 .ebcname = "FBA ",
559 .max_blocks = 96,
560 .check_device = dasd_fba_check_characteristics,
561 .do_analysis = dasd_fba_do_analysis,
562 .fill_geometry = dasd_fba_fill_geometry,
563 .start_IO = dasd_start_IO,
564 .term_IO = dasd_term_IO,
565 .handle_terminated_request = dasd_fba_handle_terminated_request,
566 .erp_action = dasd_fba_erp_action,
567 .erp_postaction = dasd_fba_erp_postaction,
568 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
569 .build_cp = dasd_fba_build_cp,
570 .free_cp = dasd_fba_free_cp,
571 .dump_sense = dasd_fba_dump_sense,
572 .fill_info = dasd_fba_fill_info,
573 };
574
575 static int __init
576 dasd_fba_init(void)
577 {
578 ASCEBC(dasd_fba_discipline.ebcname, 4);
579 return ccw_driver_register(&dasd_fba_driver);
580 }
581
582 static void __exit
583 dasd_fba_cleanup(void)
584 {
585 ccw_driver_unregister(&dasd_fba_driver);
586 }
587
588 module_init(dasd_fba_init);
589 module_exit(dasd_fba_cleanup);
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