Commit | Line | Data |
---|---|---|
138c014d | 1 | /* |
1da177e4 LT |
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 | * | |
1da177e4 LT |
7 | */ |
8 | ||
1da177e4 LT |
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[] = { | |
d2c993d8 HC |
47 | { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1}, |
48 | { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2}, | |
1da177e4 LT |
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 | { | |
40545573 | 58 | return dasd_generic_probe(cdev, &dasd_fba_discipline); |
1da177e4 LT |
59 | } |
60 | ||
61 | static int | |
62 | dasd_fba_set_online(struct ccw_device *cdev) | |
63 | { | |
40545573 | 64 | return dasd_generic_set_online(cdev, &dasd_fba_discipline); |
1da177e4 LT |
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 | ||
4d284cac | 78 | static void |
1da177e4 LT |
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 | ||
4d284cac | 98 | static void |
1da177e4 LT |
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; | |
138c014d | 121 | struct ccw_device *cdev = device->cdev; |
1da177e4 LT |
122 | void *rdc_data; |
123 | int rc; | |
124 | ||
125 | private = (struct dasd_fba_private *) device->private; | |
126 | if (private == NULL) { | |
138c014d | 127 | private = kzalloc(sizeof(struct dasd_fba_private), GFP_KERNEL); |
1da177e4 LT |
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; | |
138c014d | 200 | |
1da177e4 LT |
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); | |
347a8dc3 | 266 | #if defined(CONFIG_64BIT) |
1da177e4 LT |
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, | |
441e143e | 311 | GFP_DMA | __GFP_NOWARN); |
1da177e4 LT |
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 | } | |
4aff5e23 | 347 | if (req->cmd_flags & REQ_FAILFAST) |
1c01b8a5 | 348 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
1da177e4 LT |
349 | cqr->device = device; |
350 | cqr->expires = 5 * 60 * HZ; /* 5 minutes */ | |
d61f6f3d HH |
351 | cqr->retries = 32; |
352 | cqr->buildclk = get_clock(); | |
1da177e4 LT |
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 | |
138c014d | 535 | * addition we have one define extent ccw + 16 bytes of data and a |
1da177e4 LT |
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 | { | |
1da177e4 | 565 | ASCEBC(dasd_fba_discipline.ebcname, 4); |
40545573 | 566 | return ccw_driver_register(&dasd_fba_driver); |
1da177e4 LT |
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); |