2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Bugreports.to..: <Linux390@de.ibm.com>
4 * Copyright IBM Corp. 1999, 2009
7 #define KMSG_COMPONENT "dasd-fba"
9 #include <linux/stddef.h>
10 #include <linux/kernel.h>
11 #include <asm/debug.h>
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>
19 #include <asm/idals.h>
20 #include <asm/ebcdic.h>
22 #include <asm/ccwdev.h>
29 #endif /* PRINTK_HEADER */
30 #define PRINTK_HEADER "dasd(fba):"
32 #define FBA_DEFAULT_RETRIES 32
34 #define DASD_FBA_CCW_WRITE 0x41
35 #define DASD_FBA_CCW_READ 0x42
36 #define DASD_FBA_CCW_LOCATE 0x43
37 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
39 MODULE_LICENSE("GPL");
41 static struct dasd_discipline dasd_fba_discipline;
43 struct dasd_fba_private {
44 struct dasd_fba_characteristics rdc_data;
47 static struct ccw_device_id dasd_fba_ids[] = {
48 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
49 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
50 { /* end of list */ },
53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
55 static struct ccw_driver dasd_fba_driver; /* see below */
57 dasd_fba_probe(struct ccw_device *cdev)
59 return dasd_generic_probe(cdev, &dasd_fba_discipline);
63 dasd_fba_set_online(struct ccw_device *cdev)
65 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
68 static struct ccw_driver dasd_fba_driver = {
74 .probe = dasd_fba_probe,
75 .remove = dasd_generic_remove,
76 .set_offline = dasd_generic_set_offline,
77 .set_online = dasd_fba_set_online,
78 .notify = dasd_generic_notify,
79 .path_event = dasd_generic_path_event,
80 .freeze = dasd_generic_pm_freeze,
81 .thaw = dasd_generic_restore_device,
82 .restore = dasd_generic_restore_device,
83 .int_class = IRQIO_DAS,
87 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
88 int blksize, int beg, int nr)
90 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
93 ccw->cda = (__u32) __pa(data);
94 memset(data, 0, sizeof (struct DE_fba_data));
96 (data->mask).perm = 0x0;
98 (data->mask).perm = 0x1;
100 data->mask.perm = 0x2;
101 data->blk_size = blksize;
103 data->ext_end = nr - 1;
107 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
108 int block_nr, int block_ct)
110 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
113 ccw->cda = (__u32) __pa(data);
114 memset(data, 0, sizeof (struct LO_fba_data));
116 data->operation.cmd = 0x5;
118 data->operation.cmd = 0x6;
120 data->operation.cmd = 0x8;
121 data->blk_nr = block_nr;
122 data->blk_ct = block_ct;
126 dasd_fba_check_characteristics(struct dasd_device *device)
128 struct dasd_block *block;
129 struct dasd_fba_private *private;
130 struct ccw_device *cdev = device->cdev;
134 private = (struct dasd_fba_private *) device->private;
136 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
138 dev_warn(&device->cdev->dev,
139 "Allocating memory for private DASD "
143 device->private = (void *) private;
145 memset(private, 0, sizeof(*private));
147 block = dasd_alloc_block();
149 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
150 "dasd block structure");
151 device->private = NULL;
153 return PTR_ERR(block);
155 device->block = block;
156 block->base = device;
158 /* Read Device Characteristics */
159 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
160 &private->rdc_data, 32);
162 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
163 "characteristics returned error %d", rc);
164 device->block = NULL;
165 dasd_free_block(block);
166 device->private = NULL;
171 device->default_expires = DASD_EXPIRES;
172 device->default_retries = FBA_DEFAULT_RETRIES;
173 device->path_data.opm = LPM_ANYPATH;
175 readonly = dasd_device_is_ro(device);
177 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
179 dev_info(&device->cdev->dev,
180 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
186 ((private->rdc_data.blk_bdsa *
187 (private->rdc_data.blk_size >> 9)) >> 11),
188 private->rdc_data.blk_size,
189 readonly ? ", read-only device" : "");
193 static int dasd_fba_do_analysis(struct dasd_block *block)
195 struct dasd_fba_private *private;
198 private = (struct dasd_fba_private *) block->base->private;
199 rc = dasd_check_blocksize(private->rdc_data.blk_size);
201 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
202 private->rdc_data.blk_size);
205 block->blocks = private->rdc_data.blk_bdsa;
206 block->bp_block = private->rdc_data.blk_size;
207 block->s2b_shift = 0; /* bits to shift 512 to get a block */
208 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
213 static int dasd_fba_fill_geometry(struct dasd_block *block,
214 struct hd_geometry *geo)
216 if (dasd_check_blocksize(block->bp_block) != 0)
218 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
220 geo->sectors = 128 >> block->s2b_shift;
225 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
227 return dasd_default_erp_action;
231 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
233 if (cqr->function == dasd_default_erp_action)
234 return dasd_default_erp_postaction;
236 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
241 static void dasd_fba_check_for_device_change(struct dasd_device *device,
242 struct dasd_ccw_req *cqr,
247 /* first of all check for state change pending interrupt */
248 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
249 if ((irb->scsw.cmd.dstat & mask) == mask)
250 dasd_generic_handle_state_change(device);
253 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
254 struct dasd_block *block,
257 struct dasd_fba_private *private;
258 unsigned long *idaws;
259 struct LO_fba_data *LO_data;
260 struct dasd_ccw_req *cqr;
262 struct req_iterator iter;
265 int count, cidaw, cplength, datasize;
266 sector_t recid, first_rec, last_rec;
267 unsigned int blksize, off;
270 private = (struct dasd_fba_private *) block->base->private;
271 if (rq_data_dir(req) == READ) {
272 cmd = DASD_FBA_CCW_READ;
273 } else if (rq_data_dir(req) == WRITE) {
274 cmd = DASD_FBA_CCW_WRITE;
276 return ERR_PTR(-EINVAL);
277 blksize = block->bp_block;
278 /* Calculate record id of first and last block. */
279 first_rec = blk_rq_pos(req) >> block->s2b_shift;
281 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
282 /* Check struct bio and count the number of blocks for the request. */
285 rq_for_each_segment(bv, req, iter) {
286 if (bv->bv_len & (blksize - 1))
287 /* Fba can only do full blocks. */
288 return ERR_PTR(-EINVAL);
289 count += bv->bv_len >> (block->s2b_shift + 9);
290 #if defined(CONFIG_64BIT)
291 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
292 cidaw += bv->bv_len / blksize;
296 if (count != last_rec - first_rec + 1)
297 return ERR_PTR(-EINVAL);
298 /* 1x define extent + 1x locate record + number of blocks */
299 cplength = 2 + count;
300 /* 1x define extent + 1x locate record */
301 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
302 cidaw * sizeof(unsigned long);
304 * Find out number of additional locate record ccws if the device
305 * can't do data chaining.
307 if (private->rdc_data.mode.bits.data_chain == 0) {
308 cplength += count - 1;
309 datasize += (count - 1)*sizeof(struct LO_fba_data);
311 /* Allocate the ccw request. */
312 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
316 /* First ccw is define extent. */
317 define_extent(ccw++, cqr->data, rq_data_dir(req),
318 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
319 /* Build locate_record + read/write ccws. */
320 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
321 LO_data = (struct LO_fba_data *) (idaws + cidaw);
322 /* Locate record for all blocks for smart devices. */
323 if (private->rdc_data.mode.bits.data_chain != 0) {
324 ccw[-1].flags |= CCW_FLAG_CC;
325 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
328 rq_for_each_segment(bv, req, iter) {
329 dst = page_address(bv->bv_page) + bv->bv_offset;
330 if (dasd_page_cache) {
331 char *copy = kmem_cache_alloc(dasd_page_cache,
332 GFP_DMA | __GFP_NOWARN);
333 if (copy && rq_data_dir(req) == WRITE)
334 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
336 dst = copy + bv->bv_offset;
338 for (off = 0; off < bv->bv_len; off += blksize) {
339 /* Locate record for stupid devices. */
340 if (private->rdc_data.mode.bits.data_chain == 0) {
341 ccw[-1].flags |= CCW_FLAG_CC;
342 locate_record(ccw, LO_data++,
344 recid - first_rec, 1);
345 ccw->flags = CCW_FLAG_CC;
348 if (recid > first_rec)
349 ccw[-1].flags |= CCW_FLAG_DC;
351 ccw[-1].flags |= CCW_FLAG_CC;
354 ccw->count = block->bp_block;
355 if (idal_is_needed(dst, blksize)) {
356 ccw->cda = (__u32)(addr_t) idaws;
357 ccw->flags = CCW_FLAG_IDA;
358 idaws = idal_create_words(idaws, dst, blksize);
360 ccw->cda = (__u32)(addr_t) dst;
368 if (blk_noretry_request(req) ||
369 block->base->features & DASD_FEATURE_FAILFAST)
370 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
371 cqr->startdev = memdev;
372 cqr->memdev = memdev;
374 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
375 cqr->retries = memdev->default_retries;
376 cqr->buildclk = get_tod_clock();
377 cqr->status = DASD_CQR_FILLED;
382 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
384 struct dasd_fba_private *private;
386 struct req_iterator iter;
389 unsigned int blksize, off;
392 if (!dasd_page_cache)
394 private = (struct dasd_fba_private *) cqr->block->base->private;
395 blksize = cqr->block->bp_block;
397 /* Skip over define extent & locate record. */
399 if (private->rdc_data.mode.bits.data_chain != 0)
401 rq_for_each_segment(bv, req, iter) {
402 dst = page_address(bv->bv_page) + bv->bv_offset;
403 for (off = 0; off < bv->bv_len; off += blksize) {
404 /* Skip locate record. */
405 if (private->rdc_data.mode.bits.data_chain == 0)
408 if (ccw->flags & CCW_FLAG_IDA)
409 cda = *((char **)((addr_t) ccw->cda));
411 cda = (char *)((addr_t) ccw->cda);
413 if (rq_data_dir(req) == READ)
414 memcpy(dst, cda, bv->bv_len);
415 kmem_cache_free(dasd_page_cache,
416 (void *)((addr_t)cda & PAGE_MASK));
424 status = cqr->status == DASD_CQR_DONE;
425 dasd_sfree_request(cqr, cqr->memdev);
429 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
431 cqr->status = DASD_CQR_FILLED;
435 dasd_fba_fill_info(struct dasd_device * device,
436 struct dasd_information2_t * info)
438 info->label_block = 1;
439 info->FBA_layout = 1;
440 info->format = DASD_FORMAT_LDL;
441 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
442 memcpy(info->characteristics,
443 &((struct dasd_fba_private *) device->private)->rdc_data,
444 sizeof (struct dasd_fba_characteristics));
445 info->confdata_size = 0;
450 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
455 sense = (u64 *) dasd_get_sense(irb);
457 DBF_DEV_EVENT(DBF_EMERG, device,
458 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
460 scsw_is_tm(&irb->scsw) ? "t" : "c",
461 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
462 scsw_dstat(&irb->scsw), sense[0], sense[1],
465 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
466 "SORRY - NO VALID SENSE AVAILABLE\n");
472 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
476 struct ccw1 *act, *end, *last;
477 int len, sl, sct, count;
479 page = (char *) get_zeroed_page(GFP_ATOMIC);
481 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
482 "No memory to dump sense data");
485 len = sprintf(page, PRINTK_HEADER
486 " I/O status report for device %s:\n",
487 dev_name(&device->cdev->dev));
488 len += sprintf(page + len, PRINTK_HEADER
489 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
490 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
491 len += sprintf(page + len, PRINTK_HEADER
492 " device %s: Failing CCW: %p\n",
493 dev_name(&device->cdev->dev),
494 (void *) (addr_t) irb->scsw.cmd.cpa);
495 if (irb->esw.esw0.erw.cons) {
496 for (sl = 0; sl < 4; sl++) {
497 len += sprintf(page + len, PRINTK_HEADER
498 " Sense(hex) %2d-%2d:",
499 (8 * sl), ((8 * sl) + 7));
501 for (sct = 0; sct < 8; sct++) {
502 len += sprintf(page + len, " %02x",
503 irb->ecw[8 * sl + sct]);
505 len += sprintf(page + len, "\n");
508 len += sprintf(page + len, PRINTK_HEADER
509 " SORRY - NO VALID SENSE AVAILABLE\n");
511 printk(KERN_ERR "%s", page);
513 /* dump the Channel Program */
514 /* print first CCWs (maximum 8) */
516 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
517 end = min(act + 8, last);
518 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
520 len += sprintf(page + len, PRINTK_HEADER
521 " CCW %p: %08X %08X DAT:",
522 act, ((int *) act)[0], ((int *) act)[1]);
523 for (count = 0; count < 32 && count < act->count;
524 count += sizeof(int))
525 len += sprintf(page + len, " %08X",
526 ((int *) (addr_t) act->cda)
528 len += sprintf(page + len, "\n");
531 printk(KERN_ERR "%s", page);
534 /* print failing CCW area */
536 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
537 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
538 len += sprintf(page + len, PRINTK_HEADER "......\n");
540 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
542 len += sprintf(page + len, PRINTK_HEADER
543 " CCW %p: %08X %08X DAT:",
544 act, ((int *) act)[0], ((int *) act)[1]);
545 for (count = 0; count < 32 && count < act->count;
546 count += sizeof(int))
547 len += sprintf(page + len, " %08X",
548 ((int *) (addr_t) act->cda)
550 len += sprintf(page + len, "\n");
554 /* print last CCWs */
555 if (act < last - 2) {
557 len += sprintf(page + len, PRINTK_HEADER "......\n");
559 while (act <= last) {
560 len += sprintf(page + len, PRINTK_HEADER
561 " CCW %p: %08X %08X DAT:",
562 act, ((int *) act)[0], ((int *) act)[1]);
563 for (count = 0; count < 32 && count < act->count;
564 count += sizeof(int))
565 len += sprintf(page + len, " %08X",
566 ((int *) (addr_t) act->cda)
568 len += sprintf(page + len, "\n");
572 printk(KERN_ERR "%s", page);
573 free_page((unsigned long) page);
577 * max_blocks is dependent on the amount of storage that is available
578 * in the static io buffer for each device. Currently each device has
579 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
580 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
581 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
582 * addition we have one define extent ccw + 16 bytes of data and a
583 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
585 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
586 * We want to fit two into the available memory so that we can immediately
587 * start the next request if one finishes off. That makes 100.1 blocks
588 * for one request. Give a little safety and the result is 96.
590 static struct dasd_discipline dasd_fba_discipline = {
591 .owner = THIS_MODULE,
595 .check_device = dasd_fba_check_characteristics,
596 .do_analysis = dasd_fba_do_analysis,
597 .verify_path = dasd_generic_verify_path,
598 .fill_geometry = dasd_fba_fill_geometry,
599 .start_IO = dasd_start_IO,
600 .term_IO = dasd_term_IO,
601 .handle_terminated_request = dasd_fba_handle_terminated_request,
602 .erp_action = dasd_fba_erp_action,
603 .erp_postaction = dasd_fba_erp_postaction,
604 .check_for_device_change = dasd_fba_check_for_device_change,
605 .build_cp = dasd_fba_build_cp,
606 .free_cp = dasd_fba_free_cp,
607 .dump_sense = dasd_fba_dump_sense,
608 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
609 .fill_info = dasd_fba_fill_info,
617 ASCEBC(dasd_fba_discipline.ebcname, 4);
618 ret = ccw_driver_register(&dasd_fba_driver);
620 wait_for_device_probe();
626 dasd_fba_cleanup(void)
628 ccw_driver_unregister(&dasd_fba_driver);
631 module_init(dasd_fba_init);
632 module_exit(dasd_fba_cleanup);