?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
nfs: move nfs_file_operations declaration to bottom of file.c (try #2)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / target_core_rd.c
blob5158d3846f19cf8f79f69e7efe97f72558b0d413
1 /*******************************************************************************
2 * Filename: target_core_rd.c
3 *
4 * This file contains the Storage Engine <-> Ramdisk transport
5 * specific functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30 #include <linux/string.h>
31 #include <linux/parser.h>
32 #include <linux/timer.h>
33 #include <linux/blkdev.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_host.h>
38
39 #include <target/target_core_base.h>
40 #include <target/target_core_device.h>
41 #include <target/target_core_transport.h>
42 #include <target/target_core_fabric_ops.h>
43
44 #include "target_core_rd.h"
45
46 static struct se_subsystem_api rd_mcp_template;
47
48 /* rd_attach_hba(): (Part of se_subsystem_api_t template)
49 *
50 *
51 */
52 static int rd_attach_hba(struct se_hba *hba, u32 host_id)
53 {
54 struct rd_host *rd_host;
55
56 rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
57 if (!rd_host) {
58 pr_err("Unable to allocate memory for struct rd_host\n");
59 return -ENOMEM;
60 }
61
62 rd_host->rd_host_id = host_id;
63
64 hba->hba_ptr = rd_host;
65
66 pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
67 " Generic Target Core Stack %s\n", hba->hba_id,
68 RD_HBA_VERSION, TARGET_CORE_MOD_VERSION);
69 pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic"
70 " MaxSectors: %u\n", hba->hba_id,
71 rd_host->rd_host_id, RD_MAX_SECTORS);
72
73 return 0;
74 }
75
76 static void rd_detach_hba(struct se_hba *hba)
77 {
78 struct rd_host *rd_host = hba->hba_ptr;
79
80 pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
81 " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
82
83 kfree(rd_host);
84 hba->hba_ptr = NULL;
85 }
86
87 /* rd_release_device_space():
88 *
89 *
90 */
91 static void rd_release_device_space(struct rd_dev *rd_dev)
92 {
93 u32 i, j, page_count = 0, sg_per_table;
94 struct rd_dev_sg_table *sg_table;
95 struct page *pg;
96 struct scatterlist *sg;
97
98 if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
99 return;
100
101 sg_table = rd_dev->sg_table_array;
102
103 for (i = 0; i < rd_dev->sg_table_count; i++) {
104 sg = sg_table[i].sg_table;
105 sg_per_table = sg_table[i].rd_sg_count;
106
107 for (j = 0; j < sg_per_table; j++) {
108 pg = sg_page(&sg[j]);
109 if (pg) {
110 __free_page(pg);
111 page_count++;
112 }
113 }
114
115 kfree(sg);
116 }
117
118 pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
119 " Device ID: %u, pages %u in %u tables total bytes %lu\n",
120 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
121 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
122
123 kfree(sg_table);
124 rd_dev->sg_table_array = NULL;
125 rd_dev->sg_table_count = 0;
126 }
127
128
129 /* rd_build_device_space():
130 *
131 *
132 */
133 static int rd_build_device_space(struct rd_dev *rd_dev)
134 {
135 u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed;
136 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
137 sizeof(struct scatterlist));
138 struct rd_dev_sg_table *sg_table;
139 struct page *pg;
140 struct scatterlist *sg;
141
142 if (rd_dev->rd_page_count <= 0) {
143 pr_err("Illegal page count: %u for Ramdisk device\n",
144 rd_dev->rd_page_count);
145 return -EINVAL;
146 }
147 total_sg_needed = rd_dev->rd_page_count;
148
149 sg_tables = (total_sg_needed / max_sg_per_table) + 1;
150
151 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
152 if (!sg_table) {
153 pr_err("Unable to allocate memory for Ramdisk"
154 " scatterlist tables\n");
155 return -ENOMEM;
156 }
157
158 rd_dev->sg_table_array = sg_table;
159 rd_dev->sg_table_count = sg_tables;
160
161 while (total_sg_needed) {
162 sg_per_table = (total_sg_needed > max_sg_per_table) ?
163 max_sg_per_table : total_sg_needed;
164
165 sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
166 GFP_KERNEL);
167 if (!sg) {
168 pr_err("Unable to allocate scatterlist array"
169 " for struct rd_dev\n");
170 return -ENOMEM;
171 }
172
173 sg_init_table(sg, sg_per_table);
174
175 sg_table[i].sg_table = sg;
176 sg_table[i].rd_sg_count = sg_per_table;
177 sg_table[i].page_start_offset = page_offset;
178 sg_table[i++].page_end_offset = (page_offset + sg_per_table)
179 - 1;
180
181 for (j = 0; j < sg_per_table; j++) {
182 pg = alloc_pages(GFP_KERNEL, 0);
183 if (!pg) {
184 pr_err("Unable to allocate scatterlist"
185 " pages for struct rd_dev_sg_table\n");
186 return -ENOMEM;
187 }
188 sg_assign_page(&sg[j], pg);
189 sg[j].length = PAGE_SIZE;
190 }
191
192 page_offset += sg_per_table;
193 total_sg_needed -= sg_per_table;
194 }
195
196 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
197 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
198 rd_dev->rd_dev_id, rd_dev->rd_page_count,
199 rd_dev->sg_table_count);
200
201 return 0;
202 }
203
204 static void *rd_allocate_virtdevice(
205 struct se_hba *hba,
206 const char *name,
207 int rd_direct)
208 {
209 struct rd_dev *rd_dev;
210 struct rd_host *rd_host = hba->hba_ptr;
211
212 rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
213 if (!rd_dev) {
214 pr_err("Unable to allocate memory for struct rd_dev\n");
215 return NULL;
216 }
217
218 rd_dev->rd_host = rd_host;
219 rd_dev->rd_direct = rd_direct;
220
221 return rd_dev;
222 }
223
224 static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name)
225 {
226 return rd_allocate_virtdevice(hba, name, 0);
227 }
228
229 /* rd_create_virtdevice():
230 *
231 *
232 */
233 static struct se_device *rd_create_virtdevice(
234 struct se_hba *hba,
235 struct se_subsystem_dev *se_dev,
236 void *p,
237 int rd_direct)
238 {
239 struct se_device *dev;
240 struct se_dev_limits dev_limits;
241 struct rd_dev *rd_dev = p;
242 struct rd_host *rd_host = hba->hba_ptr;
243 int dev_flags = 0, ret;
244 char prod[16], rev[4];
245
246 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
247
248 ret = rd_build_device_space(rd_dev);
249 if (ret < 0)
250 goto fail;
251
252 snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP");
253 snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION :
254 RD_MCP_VERSION);
255
256 dev_limits.limits.logical_block_size = RD_BLOCKSIZE;
257 dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS;
258 dev_limits.limits.max_sectors = RD_MAX_SECTORS;
259 dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
260 dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH;
261
262 dev = transport_add_device_to_core_hba(hba,
263 &rd_mcp_template, se_dev, dev_flags, rd_dev,
264 &dev_limits, prod, rev);
265 if (!dev)
266 goto fail;
267
268 rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
269 rd_dev->rd_queue_depth = dev->queue_depth;
270
271 pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of"
272 " %u pages in %u tables, %lu total bytes\n",
273 rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" :
274 "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count,
275 rd_dev->sg_table_count,
276 (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
277
278 return dev;
279
280 fail:
281 rd_release_device_space(rd_dev);
282 return ERR_PTR(ret);
283 }
284
285 static struct se_device *rd_MEMCPY_create_virtdevice(
286 struct se_hba *hba,
287 struct se_subsystem_dev *se_dev,
288 void *p)
289 {
290 return rd_create_virtdevice(hba, se_dev, p, 0);
291 }
292
293 /* rd_free_device(): (Part of se_subsystem_api_t template)
294 *
295 *
296 */
297 static void rd_free_device(void *p)
298 {
299 struct rd_dev *rd_dev = p;
300
301 rd_release_device_space(rd_dev);
302 kfree(rd_dev);
303 }
304
305 static inline struct rd_request *RD_REQ(struct se_task *task)
306 {
307 return container_of(task, struct rd_request, rd_task);
308 }
309
310 static struct se_task *
311 rd_alloc_task(unsigned char *cdb)
312 {
313 struct rd_request *rd_req;
314
315 rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL);
316 if (!rd_req) {
317 pr_err("Unable to allocate struct rd_request\n");
318 return NULL;
319 }
320
321 return &rd_req->rd_task;
322 }
323
324 /* rd_get_sg_table():
325 *
326 *
327 */
328 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
329 {
330 u32 i;
331 struct rd_dev_sg_table *sg_table;
332
333 for (i = 0; i < rd_dev->sg_table_count; i++) {
334 sg_table = &rd_dev->sg_table_array[i];
335 if ((sg_table->page_start_offset <= page) &&
336 (sg_table->page_end_offset >= page))
337 return sg_table;
338 }
339
340 pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
341 page);
342
343 return NULL;
344 }
345
346 /* rd_MEMCPY_read():
347 *
348 *
349 */
350 static int rd_MEMCPY_read(struct rd_request *req)
351 {
352 struct se_task *task = &req->rd_task;
353 struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr;
354 struct rd_dev_sg_table *table;
355 struct scatterlist *sg_d, *sg_s;
356 void *dst, *src;
357 u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
358 u32 length, page_end = 0, table_sg_end;
359 u32 rd_offset = req->rd_offset;
360
361 table = rd_get_sg_table(dev, req->rd_page);
362 if (!table)
363 return -EINVAL;
364
365 table_sg_end = (table->page_end_offset - req->rd_page);
366 sg_d = task->task_sg;
367 sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
368
369 pr_debug("RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:"
370 " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
371 req->rd_page, req->rd_offset);
372
373 src_offset = rd_offset;
374
375 while (req->rd_size) {
376 if ((sg_d[i].length - dst_offset) <
377 (sg_s[j].length - src_offset)) {
378 length = (sg_d[i].length - dst_offset);
379
380 pr_debug("Step 1 - sg_d[%d]: %p length: %d"
381 " offset: %u sg_s[%d].length: %u\n", i,
382 &sg_d[i], sg_d[i].length, sg_d[i].offset, j,
383 sg_s[j].length);
384 pr_debug("Step 1 - length: %u dst_offset: %u"
385 " src_offset: %u\n", length, dst_offset,
386 src_offset);
387
388 if (length > req->rd_size)
389 length = req->rd_size;
390
391 dst = sg_virt(&sg_d[i++]) + dst_offset;
392 BUG_ON(!dst);
393
394 src = sg_virt(&sg_s[j]) + src_offset;
395 BUG_ON(!src);
396
397 dst_offset = 0;
398 src_offset = length;
399 page_end = 0;
400 } else {
401 length = (sg_s[j].length - src_offset);
402
403 pr_debug("Step 2 - sg_d[%d]: %p length: %d"
404 " offset: %u sg_s[%d].length: %u\n", i,
405 &sg_d[i], sg_d[i].length, sg_d[i].offset,
406 j, sg_s[j].length);
407 pr_debug("Step 2 - length: %u dst_offset: %u"
408 " src_offset: %u\n", length, dst_offset,
409 src_offset);
410
411 if (length > req->rd_size)
412 length = req->rd_size;
413
414 dst = sg_virt(&sg_d[i]) + dst_offset;
415 BUG_ON(!dst);
416
417 if (sg_d[i].length == length) {
418 i++;
419 dst_offset = 0;
420 } else
421 dst_offset = length;
422
423 src = sg_virt(&sg_s[j++]) + src_offset;
424 BUG_ON(!src);
425
426 src_offset = 0;
427 page_end = 1;
428 }
429
430 memcpy(dst, src, length);
431
432 pr_debug("page: %u, remaining size: %u, length: %u,"
433 " i: %u, j: %u\n", req->rd_page,
434 (req->rd_size - length), length, i, j);
435
436 req->rd_size -= length;
437 if (!req->rd_size)
438 return 0;
439
440 if (!page_end)
441 continue;
442
443 if (++req->rd_page <= table->page_end_offset) {
444 pr_debug("page: %u in same page table\n",
445 req->rd_page);
446 continue;
447 }
448
449 pr_debug("getting new page table for page: %u\n",
450 req->rd_page);
451
452 table = rd_get_sg_table(dev, req->rd_page);
453 if (!table)
454 return -EINVAL;
455
456 sg_s = &table->sg_table[j = 0];
457 }
458
459 return 0;
460 }
461
462 /* rd_MEMCPY_write():
463 *
464 *
465 */
466 static int rd_MEMCPY_write(struct rd_request *req)
467 {
468 struct se_task *task = &req->rd_task;
469 struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr;
470 struct rd_dev_sg_table *table;
471 struct scatterlist *sg_d, *sg_s;
472 void *dst, *src;
473 u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
474 u32 length, page_end = 0, table_sg_end;
475 u32 rd_offset = req->rd_offset;
476
477 table = rd_get_sg_table(dev, req->rd_page);
478 if (!table)
479 return -EINVAL;
480
481 table_sg_end = (table->page_end_offset - req->rd_page);
482 sg_d = &table->sg_table[req->rd_page - table->page_start_offset];
483 sg_s = task->task_sg;
484
485 pr_debug("RD[%d] Write LBA: %llu, Size: %u, Page: %u,"
486 " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
487 req->rd_page, req->rd_offset);
488
489 dst_offset = rd_offset;
490
491 while (req->rd_size) {
492 if ((sg_s[i].length - src_offset) <
493 (sg_d[j].length - dst_offset)) {
494 length = (sg_s[i].length - src_offset);
495
496 pr_debug("Step 1 - sg_s[%d]: %p length: %d"
497 " offset: %d sg_d[%d].length: %u\n", i,
498 &sg_s[i], sg_s[i].length, sg_s[i].offset,
499 j, sg_d[j].length);
500 pr_debug("Step 1 - length: %u src_offset: %u"
501 " dst_offset: %u\n", length, src_offset,
502 dst_offset);
503
504 if (length > req->rd_size)
505 length = req->rd_size;
506
507 src = sg_virt(&sg_s[i++]) + src_offset;
508 BUG_ON(!src);
509
510 dst = sg_virt(&sg_d[j]) + dst_offset;
511 BUG_ON(!dst);
512
513 src_offset = 0;
514 dst_offset = length;
515 page_end = 0;
516 } else {
517 length = (sg_d[j].length - dst_offset);
518
519 pr_debug("Step 2 - sg_s[%d]: %p length: %d"
520 " offset: %d sg_d[%d].length: %u\n", i,
521 &sg_s[i], sg_s[i].length, sg_s[i].offset,
522 j, sg_d[j].length);
523 pr_debug("Step 2 - length: %u src_offset: %u"
524 " dst_offset: %u\n", length, src_offset,
525 dst_offset);
526
527 if (length > req->rd_size)
528 length = req->rd_size;
529
530 src = sg_virt(&sg_s[i]) + src_offset;
531 BUG_ON(!src);
532
533 if (sg_s[i].length == length) {
534 i++;
535 src_offset = 0;
536 } else
537 src_offset = length;
538
539 dst = sg_virt(&sg_d[j++]) + dst_offset;
540 BUG_ON(!dst);
541
542 dst_offset = 0;
543 page_end = 1;
544 }
545
546 memcpy(dst, src, length);
547
548 pr_debug("page: %u, remaining size: %u, length: %u,"
549 " i: %u, j: %u\n", req->rd_page,
550 (req->rd_size - length), length, i, j);
551
552 req->rd_size -= length;
553 if (!req->rd_size)
554 return 0;
555
556 if (!page_end)
557 continue;
558
559 if (++req->rd_page <= table->page_end_offset) {
560 pr_debug("page: %u in same page table\n",
561 req->rd_page);
562 continue;
563 }
564
565 pr_debug("getting new page table for page: %u\n",
566 req->rd_page);
567
568 table = rd_get_sg_table(dev, req->rd_page);
569 if (!table)
570 return -EINVAL;
571
572 sg_d = &table->sg_table[j = 0];
573 }
574
575 return 0;
576 }
577
578 /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template)
579 *
580 *
581 */
582 static int rd_MEMCPY_do_task(struct se_task *task)
583 {
584 struct se_device *dev = task->task_se_cmd->se_dev;
585 struct rd_request *req = RD_REQ(task);
586 unsigned long long lba;
587 int ret;
588
589 req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE;
590 lba = task->task_lba;
591 req->rd_offset = (do_div(lba,
592 (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) *
593 dev->se_sub_dev->se_dev_attrib.block_size;
594 req->rd_size = task->task_size;
595
596 if (task->task_data_direction == DMA_FROM_DEVICE)
597 ret = rd_MEMCPY_read(req);
598 else
599 ret = rd_MEMCPY_write(req);
600
601 if (ret != 0)
602 return ret;
603
604 task->task_scsi_status = GOOD;
605 transport_complete_task(task, 1);
606
607 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
608 }
609
610 /* rd_free_task(): (Part of se_subsystem_api_t template)
611 *
612 *
613 */
614 static void rd_free_task(struct se_task *task)
615 {
616 kfree(RD_REQ(task));
617 }
618
619 enum {
620 Opt_rd_pages, Opt_err
621 };
622
623 static match_table_t tokens = {
624 {Opt_rd_pages, "rd_pages=%d"},
625 {Opt_err, NULL}
626 };
627
628 static ssize_t rd_set_configfs_dev_params(
629 struct se_hba *hba,
630 struct se_subsystem_dev *se_dev,
631 const char *page,
632 ssize_t count)
633 {
634 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
635 char *orig, *ptr, *opts;
636 substring_t args[MAX_OPT_ARGS];
637 int ret = 0, arg, token;
638
639 opts = kstrdup(page, GFP_KERNEL);
640 if (!opts)
641 return -ENOMEM;
642
643 orig = opts;
644
645 while ((ptr = strsep(&opts, ",")) != NULL) {
646 if (!*ptr)
647 continue;
648
649 token = match_token(ptr, tokens, args);
650 switch (token) {
651 case Opt_rd_pages:
652 match_int(args, &arg);
653 rd_dev->rd_page_count = arg;
654 pr_debug("RAMDISK: Referencing Page"
655 " Count: %u\n", rd_dev->rd_page_count);
656 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
657 break;
658 default:
659 break;
660 }
661 }
662
663 kfree(orig);
664 return (!ret) ? count : ret;
665 }
666
667 static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
668 {
669 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
670
671 if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
672 pr_debug("Missing rd_pages= parameter\n");
673 return -EINVAL;
674 }
675
676 return 0;
677 }
678
679 static ssize_t rd_show_configfs_dev_params(
680 struct se_hba *hba,
681 struct se_subsystem_dev *se_dev,
682 char *b)
683 {
684 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
685 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n",
686 rd_dev->rd_dev_id, (rd_dev->rd_direct) ?
687 "rd_direct" : "rd_mcp");
688 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu"
689 " SG_table_count: %u\n", rd_dev->rd_page_count,
690 PAGE_SIZE, rd_dev->sg_table_count);
691 return bl;
692 }
693
694 static u32 rd_get_device_rev(struct se_device *dev)
695 {
696 return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
697 }
698
699 static u32 rd_get_device_type(struct se_device *dev)
700 {
701 return TYPE_DISK;
702 }
703
704 static sector_t rd_get_blocks(struct se_device *dev)
705 {
706 struct rd_dev *rd_dev = dev->dev_ptr;
707 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
708 dev->se_sub_dev->se_dev_attrib.block_size) - 1;
709
710 return blocks_long;
711 }
712
713 static struct se_subsystem_api rd_mcp_template = {
714 .name = "rd_mcp",
715 .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV,
716 .attach_hba = rd_attach_hba,
717 .detach_hba = rd_detach_hba,
718 .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice,
719 .create_virtdevice = rd_MEMCPY_create_virtdevice,
720 .free_device = rd_free_device,
721 .alloc_task = rd_alloc_task,
722 .do_task = rd_MEMCPY_do_task,
723 .free_task = rd_free_task,
724 .check_configfs_dev_params = rd_check_configfs_dev_params,
725 .set_configfs_dev_params = rd_set_configfs_dev_params,
726 .show_configfs_dev_params = rd_show_configfs_dev_params,
727 .get_device_rev = rd_get_device_rev,
728 .get_device_type = rd_get_device_type,
729 .get_blocks = rd_get_blocks,
730 };
731
732 int __init rd_module_init(void)
733 {
734 int ret;
735
736 ret = transport_subsystem_register(&rd_mcp_template);
737 if (ret < 0) {
738 return ret;
739 }
740
741 return 0;
742 }
743
744 void rd_module_exit(void)
745 {
746 transport_subsystem_release(&rd_mcp_template);
747 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree