Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...
[linux-2.6] / drivers / s390 / block / dasd_fba.c
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_fba_private *private;
121         struct ccw_device *cdev = device->cdev;
122         void *rdc_data;
123         int rc;
124
125         private = (struct dasd_fba_private *) device->private;
126         if (private == NULL) {
127                 private = kzalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
128                 if (private == NULL) {
129                         DEV_MESSAGE(KERN_WARNING, device, "%s",
130                                     "memory allocation failed for private "
131                                     "data");
132                         return -ENOMEM;
133                 }
134                 device->private = (void *) private;
135         }
136         /* Read Device Characteristics */
137         rdc_data = (void *) &(private->rdc_data);
138         rc = read_dev_chars(device->cdev, &rdc_data, 32);
139         if (rc) {
140                 DEV_MESSAGE(KERN_WARNING, device,
141                             "Read device characteristics returned error %d",
142                             rc);
143                 return rc;
144         }
145
146         DEV_MESSAGE(KERN_INFO, device,
147                     "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
148                     cdev->id.dev_type,
149                     cdev->id.dev_model,
150                     cdev->id.cu_type,
151                     cdev->id.cu_model,
152                     ((private->rdc_data.blk_bdsa *
153                       (private->rdc_data.blk_size >> 9)) >> 11),
154                     private->rdc_data.blk_size);
155         return 0;
156 }
157
158 static int
159 dasd_fba_do_analysis(struct dasd_device *device)
160 {
161         struct dasd_fba_private *private;
162         int sb, rc;
163
164         private = (struct dasd_fba_private *) device->private;
165         rc = dasd_check_blocksize(private->rdc_data.blk_size);
166         if (rc) {
167                 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
168                             private->rdc_data.blk_size);
169                 return rc;
170         }
171         device->blocks = private->rdc_data.blk_bdsa;
172         device->bp_block = private->rdc_data.blk_size;
173         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
174         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
175                 device->s2b_shift++;
176         return 0;
177 }
178
179 static int
180 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
181 {
182         if (dasd_check_blocksize(device->bp_block) != 0)
183                 return -EINVAL;
184         geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
185         geo->heads = 16;
186         geo->sectors = 128 >> device->s2b_shift;
187         return 0;
188 }
189
190 static dasd_era_t
191 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
192 {
193         struct dasd_device *device;
194         struct ccw_device *cdev;
195
196         device = (struct dasd_device *) cqr->device;
197         if (irb->scsw.cstat == 0x00 &&
198             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
199                 return dasd_era_none;
200
201         cdev = device->cdev;
202         switch (cdev->id.dev_type) {
203         case 0x3370:
204                 return dasd_3370_erp_examine(cqr, irb);
205         case 0x9336:
206                 return dasd_9336_erp_examine(cqr, irb);
207         default:
208                 return dasd_era_recover;
209         }
210 }
211
212 static dasd_erp_fn_t
213 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
214 {
215         return dasd_default_erp_action;
216 }
217
218 static dasd_erp_fn_t
219 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
220 {
221         if (cqr->function == dasd_default_erp_action)
222                 return dasd_default_erp_postaction;
223
224         DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
225                     cqr->function);
226         return NULL;
227 }
228
229 static struct dasd_ccw_req *
230 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
231 {
232         struct dasd_fba_private *private;
233         unsigned long *idaws;
234         struct LO_fba_data *LO_data;
235         struct dasd_ccw_req *cqr;
236         struct ccw1 *ccw;
237         struct bio *bio;
238         struct bio_vec *bv;
239         char *dst;
240         int count, cidaw, cplength, datasize;
241         sector_t recid, first_rec, last_rec;
242         unsigned int blksize, off;
243         unsigned char cmd;
244         int i;
245
246         private = (struct dasd_fba_private *) device->private;
247         if (rq_data_dir(req) == READ) {
248                 cmd = DASD_FBA_CCW_READ;
249         } else if (rq_data_dir(req) == WRITE) {
250                 cmd = DASD_FBA_CCW_WRITE;
251         } else
252                 return ERR_PTR(-EINVAL);
253         blksize = device->bp_block;
254         /* Calculate record id of first and last block. */
255         first_rec = req->sector >> device->s2b_shift;
256         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
257         /* Check struct bio and count the number of blocks for the request. */
258         count = 0;
259         cidaw = 0;
260         rq_for_each_bio(bio, req) {
261                 bio_for_each_segment(bv, bio, i) {
262                         if (bv->bv_len & (blksize - 1))
263                                 /* Fba can only do full blocks. */
264                                 return ERR_PTR(-EINVAL);
265                         count += bv->bv_len >> (device->s2b_shift + 9);
266 #if defined(CONFIG_64BIT)
267                         if (idal_is_needed (page_address(bv->bv_page),
268                                             bv->bv_len))
269                                 cidaw += bv->bv_len / blksize;
270 #endif
271                 }
272         }
273         /* Paranoia. */
274         if (count != last_rec - first_rec + 1)
275                 return ERR_PTR(-EINVAL);
276         /* 1x define extent + 1x locate record + number of blocks */
277         cplength = 2 + count;
278         /* 1x define extent + 1x locate record */
279         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
280                 cidaw * sizeof(unsigned long);
281         /*
282          * Find out number of additional locate record ccws if the device
283          * can't do data chaining.
284          */
285         if (private->rdc_data.mode.bits.data_chain == 0) {
286                 cplength += count - 1;
287                 datasize += (count - 1)*sizeof(struct LO_fba_data);
288         }
289         /* Allocate the ccw request. */
290         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
291                                    cplength, datasize, device);
292         if (IS_ERR(cqr))
293                 return cqr;
294         ccw = cqr->cpaddr;
295         /* First ccw is define extent. */
296         define_extent(ccw++, cqr->data, rq_data_dir(req),
297                       device->bp_block, req->sector, req->nr_sectors);
298         /* Build locate_record + read/write ccws. */
299         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
300         LO_data = (struct LO_fba_data *) (idaws + cidaw);
301         /* Locate record for all blocks for smart devices. */
302         if (private->rdc_data.mode.bits.data_chain != 0) {
303                 ccw[-1].flags |= CCW_FLAG_CC;
304                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
305         }
306         recid = first_rec;
307         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
308                 dst = page_address(bv->bv_page) + bv->bv_offset;
309                 if (dasd_page_cache) {
310                         char *copy = kmem_cache_alloc(dasd_page_cache,
311                                                       GFP_DMA | __GFP_NOWARN);
312                         if (copy && rq_data_dir(req) == WRITE)
313                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
314                         if (copy)
315                                 dst = copy + bv->bv_offset;
316                 }
317                 for (off = 0; off < bv->bv_len; off += blksize) {
318                         /* Locate record for stupid devices. */
319                         if (private->rdc_data.mode.bits.data_chain == 0) {
320                                 ccw[-1].flags |= CCW_FLAG_CC;
321                                 locate_record(ccw, LO_data++,
322                                               rq_data_dir(req),
323                                               recid - first_rec, 1);
324                                 ccw->flags = CCW_FLAG_CC;
325                                 ccw++;
326                         } else {
327                                 if (recid > first_rec)
328                                         ccw[-1].flags |= CCW_FLAG_DC;
329                                 else
330                                         ccw[-1].flags |= CCW_FLAG_CC;
331                         }
332                         ccw->cmd_code = cmd;
333                         ccw->count = device->bp_block;
334                         if (idal_is_needed(dst, blksize)) {
335                                 ccw->cda = (__u32)(addr_t) idaws;
336                                 ccw->flags = CCW_FLAG_IDA;
337                                 idaws = idal_create_words(idaws, dst, blksize);
338                         } else {
339                                 ccw->cda = (__u32)(addr_t) dst;
340                                 ccw->flags = 0;
341                         }
342                         ccw++;
343                         dst += blksize;
344                         recid++;
345                 }
346         }
347         if (req->cmd_flags & REQ_FAILFAST)
348                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
349         cqr->device = device;
350         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
351         cqr->retries = 32;
352         cqr->buildclk = get_clock();
353         cqr->status = DASD_CQR_FILLED;
354         return cqr;
355 }
356
357 static int
358 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
359 {
360         struct dasd_fba_private *private;
361         struct ccw1 *ccw;
362         struct bio *bio;
363         struct bio_vec *bv;
364         char *dst, *cda;
365         unsigned int blksize, off;
366         int i, status;
367
368         if (!dasd_page_cache)
369                 goto out;
370         private = (struct dasd_fba_private *) cqr->device->private;
371         blksize = cqr->device->bp_block;
372         ccw = cqr->cpaddr;
373         /* Skip over define extent & locate record. */
374         ccw++;
375         if (private->rdc_data.mode.bits.data_chain != 0)
376                 ccw++;
377         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
378                 dst = page_address(bv->bv_page) + bv->bv_offset;
379                 for (off = 0; off < bv->bv_len; off += blksize) {
380                         /* Skip locate record. */
381                         if (private->rdc_data.mode.bits.data_chain == 0)
382                                 ccw++;
383                         if (dst) {
384                                 if (ccw->flags & CCW_FLAG_IDA)
385                                         cda = *((char **)((addr_t) ccw->cda));
386                                 else
387                                         cda = (char *)((addr_t) ccw->cda);
388                                 if (dst != cda) {
389                                         if (rq_data_dir(req) == READ)
390                                                 memcpy(dst, cda, bv->bv_len);
391                                         kmem_cache_free(dasd_page_cache,
392                                             (void *)((addr_t)cda & PAGE_MASK));
393                                 }
394                                 dst = NULL;
395                         }
396                         ccw++;
397                 }
398         }
399 out:
400         status = cqr->status == DASD_CQR_DONE;
401         dasd_sfree_request(cqr, cqr->device);
402         return status;
403 }
404
405 static int
406 dasd_fba_fill_info(struct dasd_device * device,
407                    struct dasd_information2_t * info)
408 {
409         info->label_block = 1;
410         info->FBA_layout = 1;
411         info->format = DASD_FORMAT_LDL;
412         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
413         memcpy(info->characteristics,
414                &((struct dasd_fba_private *) device->private)->rdc_data,
415                sizeof (struct dasd_fba_characteristics));
416         info->confdata_size = 0;
417         return 0;
418 }
419
420 static void
421 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
422                     struct irb *irb)
423 {
424         char *page;
425         struct ccw1 *act, *end, *last;
426         int len, sl, sct, count;
427
428         page = (char *) get_zeroed_page(GFP_ATOMIC);
429         if (page == NULL) {
430                 DEV_MESSAGE(KERN_ERR, device, " %s",
431                             "No memory to dump sense data");
432                 return;
433         }
434         len = sprintf(page, KERN_ERR PRINTK_HEADER
435                       " I/O status report for device %s:\n",
436                       device->cdev->dev.bus_id);
437         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
438                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
439                        irb->scsw.cstat, irb->scsw.dstat);
440         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
441                        " device %s: Failing CCW: %p\n",
442                        device->cdev->dev.bus_id,
443                        (void *) (addr_t) irb->scsw.cpa);
444         if (irb->esw.esw0.erw.cons) {
445                 for (sl = 0; sl < 4; sl++) {
446                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
447                                        " Sense(hex) %2d-%2d:",
448                                        (8 * sl), ((8 * sl) + 7));
449
450                         for (sct = 0; sct < 8; sct++) {
451                                 len += sprintf(page + len, " %02x",
452                                                irb->ecw[8 * sl + sct]);
453                         }
454                         len += sprintf(page + len, "\n");
455                 }
456         } else {
457                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
458                                " SORRY - NO VALID SENSE AVAILABLE\n");
459         }
460         MESSAGE_LOG(KERN_ERR, "%s",
461                     page + sizeof(KERN_ERR PRINTK_HEADER));
462
463         /* dump the Channel Program */
464         /* print first CCWs (maximum 8) */
465         act = req->cpaddr;
466         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
467         end = min(act + 8, last);
468         len = sprintf(page, KERN_ERR PRINTK_HEADER
469                       " Related CP in req: %p\n", req);
470         while (act <= end) {
471                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
472                                " CCW %p: %08X %08X DAT:",
473                                act, ((int *) act)[0], ((int *) act)[1]);
474                 for (count = 0; count < 32 && count < act->count;
475                      count += sizeof(int))
476                         len += sprintf(page + len, " %08X",
477                                        ((int *) (addr_t) act->cda)
478                                        [(count>>2)]);
479                 len += sprintf(page + len, "\n");
480                 act++;
481         }
482         MESSAGE_LOG(KERN_ERR, "%s",
483                     page + sizeof(KERN_ERR PRINTK_HEADER));
484
485
486         /* print failing CCW area */
487         len = 0;
488         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
489                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
490                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
491         }
492         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
493         while (act <= end) {
494                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
495                                " CCW %p: %08X %08X DAT:",
496                                act, ((int *) act)[0], ((int *) act)[1]);
497                 for (count = 0; count < 32 && count < act->count;
498                      count += sizeof(int))
499                         len += sprintf(page + len, " %08X",
500                                        ((int *) (addr_t) act->cda)
501                                        [(count>>2)]);
502                 len += sprintf(page + len, "\n");
503                 act++;
504         }
505
506         /* print last CCWs */
507         if (act <  last - 2) {
508                 act = last - 2;
509                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
510         }
511         while (act <= last) {
512                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
513                                " CCW %p: %08X %08X DAT:",
514                                act, ((int *) act)[0], ((int *) act)[1]);
515                 for (count = 0; count < 32 && count < act->count;
516                      count += sizeof(int))
517                         len += sprintf(page + len, " %08X",
518                                        ((int *) (addr_t) act->cda)
519                                        [(count>>2)]);
520                 len += sprintf(page + len, "\n");
521                 act++;
522         }
523         if (len > 0)
524                 MESSAGE_LOG(KERN_ERR, "%s",
525                             page + sizeof(KERN_ERR PRINTK_HEADER));
526         free_page((unsigned long) page);
527 }
528
529 /*
530  * max_blocks is dependent on the amount of storage that is available
531  * in the static io buffer for each device. Currently each device has
532  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
533  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
534  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
535  * addition we have one define extent ccw + 16 bytes of data and a
536  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
537  * That makes:
538  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
539  * We want to fit two into the available memory so that we can immediately
540  * start the next request if one finishes off. That makes 100.1 blocks
541  * for one request. Give a little safety and the result is 96.
542  */
543 static struct dasd_discipline dasd_fba_discipline = {
544         .owner = THIS_MODULE,
545         .name = "FBA ",
546         .ebcname = "FBA ",
547         .max_blocks = 96,
548         .check_device = dasd_fba_check_characteristics,
549         .do_analysis = dasd_fba_do_analysis,
550         .fill_geometry = dasd_fba_fill_geometry,
551         .start_IO = dasd_start_IO,
552         .term_IO = dasd_term_IO,
553         .examine_error = dasd_fba_examine_error,
554         .erp_action = dasd_fba_erp_action,
555         .erp_postaction = dasd_fba_erp_postaction,
556         .build_cp = dasd_fba_build_cp,
557         .free_cp = dasd_fba_free_cp,
558         .dump_sense = dasd_fba_dump_sense,
559         .fill_info = dasd_fba_fill_info,
560 };
561
562 static int __init
563 dasd_fba_init(void)
564 {
565         ASCEBC(dasd_fba_discipline.ebcname, 4);
566         return ccw_driver_register(&dasd_fba_driver);
567 }
568
569 static void __exit
570 dasd_fba_cleanup(void)
571 {
572         ccw_driver_unregister(&dasd_fba_driver);
573 }
574
575 module_init(dasd_fba_init);
576 module_exit(dasd_fba_cleanup);