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
9 #include <linux/config.h>
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <asm/debug.h>
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
20 #include <asm/idals.h>
21 #include <asm/ebcdic.h>
23 #include <asm/todclk.h>
24 #include <asm/ccwdev.h>
31 #endif /* PRINTK_HEADER */
32 #define PRINTK_HEADER "dasd(fba):"
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
= {
72 .probe
= dasd_fba_probe
,
73 .remove
= dasd_generic_remove
,
74 .set_offline
= dasd_generic_set_offline
,
75 .set_online
= dasd_fba_set_online
,
76 .notify
= dasd_generic_notify
,
80 define_extent(struct ccw1
* ccw
, struct DE_fba_data
*data
, int rw
,
81 int blksize
, int beg
, int nr
)
83 ccw
->cmd_code
= DASD_FBA_CCW_DEFINE_EXTENT
;
86 ccw
->cda
= (__u32
) __pa(data
);
87 memset(data
, 0, sizeof (struct DE_fba_data
));
89 (data
->mask
).perm
= 0x0;
91 (data
->mask
).perm
= 0x1;
93 data
->mask
.perm
= 0x2;
94 data
->blk_size
= blksize
;
96 data
->ext_end
= nr
- 1;
100 locate_record(struct ccw1
* ccw
, struct LO_fba_data
*data
, int rw
,
101 int block_nr
, int block_ct
)
103 ccw
->cmd_code
= DASD_FBA_CCW_LOCATE
;
106 ccw
->cda
= (__u32
) __pa(data
);
107 memset(data
, 0, sizeof (struct LO_fba_data
));
109 data
->operation
.cmd
= 0x5;
111 data
->operation
.cmd
= 0x6;
113 data
->operation
.cmd
= 0x8;
114 data
->blk_nr
= block_nr
;
115 data
->blk_ct
= block_ct
;
119 dasd_fba_check_characteristics(struct dasd_device
*device
)
121 struct dasd_fba_private
*private;
122 struct ccw_device
*cdev
= device
->cdev
;
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 "
135 device
->private = (void *) private;
137 /* Read Device Characteristics */
138 rdc_data
= (void *) &(private->rdc_data
);
139 rc
= read_dev_chars(device
->cdev
, &rdc_data
, 32);
141 DEV_MESSAGE(KERN_WARNING
, device
,
142 "Read device characteristics returned error %d",
147 DEV_MESSAGE(KERN_INFO
, device
,
148 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
153 ((private->rdc_data
.blk_bdsa
*
154 (private->rdc_data
.blk_size
>> 9)) >> 11),
155 private->rdc_data
.blk_size
);
160 dasd_fba_do_analysis(struct dasd_device
*device
)
162 struct dasd_fba_private
*private;
165 private = (struct dasd_fba_private
*) device
->private;
166 rc
= dasd_check_blocksize(private->rdc_data
.blk_size
);
168 DEV_MESSAGE(KERN_INFO
, device
, "unknown blocksize %d",
169 private->rdc_data
.blk_size
);
172 device
->blocks
= private->rdc_data
.blk_bdsa
;
173 device
->bp_block
= private->rdc_data
.blk_size
;
174 device
->s2b_shift
= 0; /* bits to shift 512 to get a block */
175 for (sb
= 512; sb
< private->rdc_data
.blk_size
; sb
= sb
<< 1)
181 dasd_fba_fill_geometry(struct dasd_device
*device
, struct hd_geometry
*geo
)
183 if (dasd_check_blocksize(device
->bp_block
) != 0)
185 geo
->cylinders
= (device
->blocks
<< device
->s2b_shift
) >> 10;
187 geo
->sectors
= 128 >> device
->s2b_shift
;
192 dasd_fba_examine_error(struct dasd_ccw_req
* cqr
, struct irb
* irb
)
194 struct dasd_device
*device
;
195 struct ccw_device
*cdev
;
197 device
= (struct dasd_device
*) cqr
->device
;
198 if (irb
->scsw
.cstat
== 0x00 &&
199 irb
->scsw
.dstat
== (DEV_STAT_CHN_END
| DEV_STAT_DEV_END
))
200 return dasd_era_none
;
203 switch (cdev
->id
.dev_type
) {
205 return dasd_3370_erp_examine(cqr
, irb
);
207 return dasd_9336_erp_examine(cqr
, irb
);
209 return dasd_era_recover
;
214 dasd_fba_erp_action(struct dasd_ccw_req
* cqr
)
216 return dasd_default_erp_action
;
220 dasd_fba_erp_postaction(struct dasd_ccw_req
* cqr
)
222 if (cqr
->function
== dasd_default_erp_action
)
223 return dasd_default_erp_postaction
;
225 DEV_MESSAGE(KERN_WARNING
, cqr
->device
, "unknown ERP action %p",
230 static struct dasd_ccw_req
*
231 dasd_fba_build_cp(struct dasd_device
* device
, struct request
*req
)
233 struct dasd_fba_private
*private;
234 unsigned long *idaws
;
235 struct LO_fba_data
*LO_data
;
236 struct dasd_ccw_req
*cqr
;
241 int count
, cidaw
, cplength
, datasize
;
242 sector_t recid
, first_rec
, last_rec
;
243 unsigned int blksize
, off
;
247 private = (struct dasd_fba_private
*) device
->private;
248 if (rq_data_dir(req
) == READ
) {
249 cmd
= DASD_FBA_CCW_READ
;
250 } else if (rq_data_dir(req
) == WRITE
) {
251 cmd
= DASD_FBA_CCW_WRITE
;
253 return ERR_PTR(-EINVAL
);
254 blksize
= device
->bp_block
;
255 /* Calculate record id of first and last block. */
256 first_rec
= req
->sector
>> device
->s2b_shift
;
257 last_rec
= (req
->sector
+ req
->nr_sectors
- 1) >> device
->s2b_shift
;
258 /* Check struct bio and count the number of blocks for the request. */
261 rq_for_each_bio(bio
, req
) {
262 bio_for_each_segment(bv
, bio
, i
) {
263 if (bv
->bv_len
& (blksize
- 1))
264 /* Fba can only do full blocks. */
265 return ERR_PTR(-EINVAL
);
266 count
+= bv
->bv_len
>> (device
->s2b_shift
+ 9);
267 #if defined(CONFIG_64BIT)
268 if (idal_is_needed (page_address(bv
->bv_page
),
270 cidaw
+= bv
->bv_len
/ blksize
;
275 if (count
!= last_rec
- first_rec
+ 1)
276 return ERR_PTR(-EINVAL
);
277 /* 1x define extent + 1x locate record + number of blocks */
278 cplength
= 2 + count
;
279 /* 1x define extent + 1x locate record */
280 datasize
= sizeof(struct DE_fba_data
) + sizeof(struct LO_fba_data
) +
281 cidaw
* sizeof(unsigned long);
283 * Find out number of additional locate record ccws if the device
284 * can't do data chaining.
286 if (private->rdc_data
.mode
.bits
.data_chain
== 0) {
287 cplength
+= count
- 1;
288 datasize
+= (count
- 1)*sizeof(struct LO_fba_data
);
290 /* Allocate the ccw request. */
291 cqr
= dasd_smalloc_request(dasd_fba_discipline
.name
,
292 cplength
, datasize
, device
);
296 /* First ccw is define extent. */
297 define_extent(ccw
++, cqr
->data
, rq_data_dir(req
),
298 device
->bp_block
, req
->sector
, req
->nr_sectors
);
299 /* Build locate_record + read/write ccws. */
300 idaws
= (unsigned long *) (cqr
->data
+ sizeof(struct DE_fba_data
));
301 LO_data
= (struct LO_fba_data
*) (idaws
+ cidaw
);
302 /* Locate record for all blocks for smart devices. */
303 if (private->rdc_data
.mode
.bits
.data_chain
!= 0) {
304 ccw
[-1].flags
|= CCW_FLAG_CC
;
305 locate_record(ccw
++, LO_data
++, rq_data_dir(req
), 0, count
);
308 rq_for_each_bio(bio
, req
) bio_for_each_segment(bv
, bio
, i
) {
309 dst
= page_address(bv
->bv_page
) + bv
->bv_offset
;
310 if (dasd_page_cache
) {
311 char *copy
= kmem_cache_alloc(dasd_page_cache
,
312 SLAB_DMA
| __GFP_NOWARN
);
313 if (copy
&& rq_data_dir(req
) == WRITE
)
314 memcpy(copy
+ bv
->bv_offset
, dst
, bv
->bv_len
);
316 dst
= copy
+ bv
->bv_offset
;
318 for (off
= 0; off
< bv
->bv_len
; off
+= blksize
) {
319 /* Locate record for stupid devices. */
320 if (private->rdc_data
.mode
.bits
.data_chain
== 0) {
321 ccw
[-1].flags
|= CCW_FLAG_CC
;
322 locate_record(ccw
, LO_data
++,
324 recid
- first_rec
, 1);
325 ccw
->flags
= CCW_FLAG_CC
;
328 if (recid
> first_rec
)
329 ccw
[-1].flags
|= CCW_FLAG_DC
;
331 ccw
[-1].flags
|= CCW_FLAG_CC
;
334 ccw
->count
= device
->bp_block
;
335 if (idal_is_needed(dst
, blksize
)) {
336 ccw
->cda
= (__u32
)(addr_t
) idaws
;
337 ccw
->flags
= CCW_FLAG_IDA
;
338 idaws
= idal_create_words(idaws
, dst
, blksize
);
340 ccw
->cda
= (__u32
)(addr_t
) dst
;
348 if (req
->flags
& REQ_FAILFAST
)
349 set_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
);
350 cqr
->device
= device
;
351 cqr
->expires
= 5 * 60 * HZ
; /* 5 minutes */
353 cqr
->buildclk
= get_clock();
354 cqr
->status
= DASD_CQR_FILLED
;
359 dasd_fba_free_cp(struct dasd_ccw_req
*cqr
, struct request
*req
)
361 struct dasd_fba_private
*private;
366 unsigned int blksize
, off
;
369 if (!dasd_page_cache
)
371 private = (struct dasd_fba_private
*) cqr
->device
->private;
372 blksize
= cqr
->device
->bp_block
;
374 /* Skip over define extent & locate record. */
376 if (private->rdc_data
.mode
.bits
.data_chain
!= 0)
378 rq_for_each_bio(bio
, req
) bio_for_each_segment(bv
, bio
, i
) {
379 dst
= page_address(bv
->bv_page
) + bv
->bv_offset
;
380 for (off
= 0; off
< bv
->bv_len
; off
+= blksize
) {
381 /* Skip locate record. */
382 if (private->rdc_data
.mode
.bits
.data_chain
== 0)
385 if (ccw
->flags
& CCW_FLAG_IDA
)
386 cda
= *((char **)((addr_t
) ccw
->cda
));
388 cda
= (char *)((addr_t
) ccw
->cda
);
390 if (rq_data_dir(req
) == READ
)
391 memcpy(dst
, cda
, bv
->bv_len
);
392 kmem_cache_free(dasd_page_cache
,
393 (void *)((addr_t
)cda
& PAGE_MASK
));
401 status
= cqr
->status
== DASD_CQR_DONE
;
402 dasd_sfree_request(cqr
, cqr
->device
);
407 dasd_fba_fill_info(struct dasd_device
* device
,
408 struct dasd_information2_t
* info
)
410 info
->label_block
= 1;
411 info
->FBA_layout
= 1;
412 info
->format
= DASD_FORMAT_LDL
;
413 info
->characteristics_size
= sizeof(struct dasd_fba_characteristics
);
414 memcpy(info
->characteristics
,
415 &((struct dasd_fba_private
*) device
->private)->rdc_data
,
416 sizeof (struct dasd_fba_characteristics
));
417 info
->confdata_size
= 0;
422 dasd_fba_dump_sense(struct dasd_device
*device
, struct dasd_ccw_req
* req
,
426 struct ccw1
*act
, *end
, *last
;
427 int len
, sl
, sct
, count
;
429 page
= (char *) get_zeroed_page(GFP_ATOMIC
);
431 DEV_MESSAGE(KERN_ERR
, device
, " %s",
432 "No memory to dump sense data");
435 len
= sprintf(page
, KERN_ERR PRINTK_HEADER
436 " I/O status report for device %s:\n",
437 device
->cdev
->dev
.bus_id
);
438 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
439 " in req: %p CS: 0x%02X DS: 0x%02X\n", req
,
440 irb
->scsw
.cstat
, irb
->scsw
.dstat
);
441 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
442 " device %s: Failing CCW: %p\n",
443 device
->cdev
->dev
.bus_id
,
444 (void *) (addr_t
) irb
->scsw
.cpa
);
445 if (irb
->esw
.esw0
.erw
.cons
) {
446 for (sl
= 0; sl
< 4; sl
++) {
447 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
448 " Sense(hex) %2d-%2d:",
449 (8 * sl
), ((8 * sl
) + 7));
451 for (sct
= 0; sct
< 8; sct
++) {
452 len
+= sprintf(page
+ len
, " %02x",
453 irb
->ecw
[8 * sl
+ sct
]);
455 len
+= sprintf(page
+ len
, "\n");
458 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
459 " SORRY - NO VALID SENSE AVAILABLE\n");
461 MESSAGE_LOG(KERN_ERR
, "%s",
462 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
464 /* dump the Channel Program */
465 /* print first CCWs (maximum 8) */
467 for (last
= act
; last
->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
); last
++);
468 end
= min(act
+ 8, last
);
469 len
= sprintf(page
, KERN_ERR PRINTK_HEADER
470 " Related CP in req: %p\n", req
);
472 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
473 " CCW %p: %08X %08X DAT:",
474 act
, ((int *) act
)[0], ((int *) act
)[1]);
475 for (count
= 0; count
< 32 && count
< act
->count
;
476 count
+= sizeof(int))
477 len
+= sprintf(page
+ len
, " %08X",
478 ((int *) (addr_t
) act
->cda
)
480 len
+= sprintf(page
+ len
, "\n");
483 MESSAGE_LOG(KERN_ERR
, "%s",
484 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
487 /* print failing CCW area */
489 if (act
< ((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
) - 2) {
490 act
= ((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
) - 2;
491 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
"......\n");
493 end
= min((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
+ 2, last
);
495 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
496 " CCW %p: %08X %08X DAT:",
497 act
, ((int *) act
)[0], ((int *) act
)[1]);
498 for (count
= 0; count
< 32 && count
< act
->count
;
499 count
+= sizeof(int))
500 len
+= sprintf(page
+ len
, " %08X",
501 ((int *) (addr_t
) act
->cda
)
503 len
+= sprintf(page
+ len
, "\n");
507 /* print last CCWs */
508 if (act
< last
- 2) {
510 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
"......\n");
512 while (act
<= last
) {
513 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
514 " CCW %p: %08X %08X DAT:",
515 act
, ((int *) act
)[0], ((int *) act
)[1]);
516 for (count
= 0; count
< 32 && count
< act
->count
;
517 count
+= sizeof(int))
518 len
+= sprintf(page
+ len
, " %08X",
519 ((int *) (addr_t
) act
->cda
)
521 len
+= sprintf(page
+ len
, "\n");
525 MESSAGE_LOG(KERN_ERR
, "%s",
526 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
527 free_page((unsigned long) page
);
531 * max_blocks is dependent on the amount of storage that is available
532 * in the static io buffer for each device. Currently each device has
533 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
534 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
535 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
536 * addition we have one define extent ccw + 16 bytes of data and a
537 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
539 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
540 * We want to fit two into the available memory so that we can immediately
541 * start the next request if one finishes off. That makes 100.1 blocks
542 * for one request. Give a little safety and the result is 96.
544 static struct dasd_discipline dasd_fba_discipline
= {
545 .owner
= THIS_MODULE
,
549 .check_device
= dasd_fba_check_characteristics
,
550 .do_analysis
= dasd_fba_do_analysis
,
551 .fill_geometry
= dasd_fba_fill_geometry
,
552 .start_IO
= dasd_start_IO
,
553 .term_IO
= dasd_term_IO
,
554 .examine_error
= dasd_fba_examine_error
,
555 .erp_action
= dasd_fba_erp_action
,
556 .erp_postaction
= dasd_fba_erp_postaction
,
557 .build_cp
= dasd_fba_build_cp
,
558 .free_cp
= dasd_fba_free_cp
,
559 .dump_sense
= dasd_fba_dump_sense
,
560 .fill_info
= dasd_fba_fill_info
,
566 ASCEBC(dasd_fba_discipline
.ebcname
, 4);
567 return ccw_driver_register(&dasd_fba_driver
);
571 dasd_fba_cleanup(void)
573 ccw_driver_unregister(&dasd_fba_driver
);
576 module_init(dasd_fba_init
);
577 module_exit(dasd_fba_cleanup
);