Commit | Line | Data |
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c66ac9db NB |
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 | ||
c66ac9db NB |
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> | |
c66ac9db NB |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_host.h> | |
38 | ||
39 | #include <target/target_core_base.h> | |
c4795fb2 | 40 | #include <target/target_core_backend.h> |
c66ac9db NB |
41 | |
42 | #include "target_core_rd.h" | |
43 | ||
c66ac9db NB |
44 | static struct se_subsystem_api rd_mcp_template; |
45 | ||
c66ac9db NB |
46 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
47 | * | |
48 | * | |
49 | */ | |
50 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
51 | { | |
52 | struct rd_host *rd_host; | |
53 | ||
54 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
55 | if (!rd_host) { |
56 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
57 | return -ENOMEM; |
58 | } | |
59 | ||
60 | rd_host->rd_host_id = host_id; | |
61 | ||
5951146d | 62 | hba->hba_ptr = rd_host; |
c66ac9db | 63 | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
65 | " Generic Target Core Stack %s\n", hba->hba_id, |
66 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
6708bb27 | 67 | pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
e3d6f909 AG |
68 | " MaxSectors: %u\n", hba->hba_id, |
69 | rd_host->rd_host_id, RD_MAX_SECTORS); | |
c66ac9db NB |
70 | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static void rd_detach_hba(struct se_hba *hba) | |
75 | { | |
76 | struct rd_host *rd_host = hba->hba_ptr; | |
77 | ||
6708bb27 | 78 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
79 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
80 | ||
81 | kfree(rd_host); | |
82 | hba->hba_ptr = NULL; | |
83 | } | |
84 | ||
85 | /* rd_release_device_space(): | |
86 | * | |
87 | * | |
88 | */ | |
89 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
90 | { | |
91 | u32 i, j, page_count = 0, sg_per_table; | |
92 | struct rd_dev_sg_table *sg_table; | |
93 | struct page *pg; | |
94 | struct scatterlist *sg; | |
95 | ||
96 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
97 | return; | |
98 | ||
99 | sg_table = rd_dev->sg_table_array; | |
100 | ||
101 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
102 | sg = sg_table[i].sg_table; | |
103 | sg_per_table = sg_table[i].rd_sg_count; | |
104 | ||
105 | for (j = 0; j < sg_per_table; j++) { | |
106 | pg = sg_page(&sg[j]); | |
6708bb27 | 107 | if (pg) { |
c66ac9db NB |
108 | __free_page(pg); |
109 | page_count++; | |
110 | } | |
111 | } | |
112 | ||
113 | kfree(sg); | |
114 | } | |
115 | ||
6708bb27 | 116 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
117 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
118 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
119 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
120 | ||
121 | kfree(sg_table); | |
122 | rd_dev->sg_table_array = NULL; | |
123 | rd_dev->sg_table_count = 0; | |
124 | } | |
125 | ||
126 | ||
127 | /* rd_build_device_space(): | |
128 | * | |
129 | * | |
130 | */ | |
131 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
132 | { | |
133 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
134 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
135 | sizeof(struct scatterlist)); | |
136 | struct rd_dev_sg_table *sg_table; | |
137 | struct page *pg; | |
138 | struct scatterlist *sg; | |
139 | ||
140 | if (rd_dev->rd_page_count <= 0) { | |
6708bb27 | 141 | pr_err("Illegal page count: %u for Ramdisk device\n", |
c66ac9db | 142 | rd_dev->rd_page_count); |
065f9716 | 143 | return -EINVAL; |
c66ac9db NB |
144 | } |
145 | total_sg_needed = rd_dev->rd_page_count; | |
146 | ||
147 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
148 | ||
149 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
6708bb27 AG |
150 | if (!sg_table) { |
151 | pr_err("Unable to allocate memory for Ramdisk" | |
c66ac9db | 152 | " scatterlist tables\n"); |
065f9716 | 153 | return -ENOMEM; |
c66ac9db NB |
154 | } |
155 | ||
156 | rd_dev->sg_table_array = sg_table; | |
157 | rd_dev->sg_table_count = sg_tables; | |
158 | ||
159 | while (total_sg_needed) { | |
160 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
161 | max_sg_per_table : total_sg_needed; | |
162 | ||
163 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
164 | GFP_KERNEL); | |
6708bb27 AG |
165 | if (!sg) { |
166 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 167 | " for struct rd_dev\n"); |
065f9716 | 168 | return -ENOMEM; |
c66ac9db NB |
169 | } |
170 | ||
6708bb27 | 171 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
172 | |
173 | sg_table[i].sg_table = sg; | |
174 | sg_table[i].rd_sg_count = sg_per_table; | |
175 | sg_table[i].page_start_offset = page_offset; | |
176 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
177 | - 1; | |
178 | ||
179 | for (j = 0; j < sg_per_table; j++) { | |
180 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
181 | if (!pg) { |
182 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 183 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 184 | return -ENOMEM; |
c66ac9db NB |
185 | } |
186 | sg_assign_page(&sg[j], pg); | |
187 | sg[j].length = PAGE_SIZE; | |
188 | } | |
189 | ||
190 | page_offset += sg_per_table; | |
191 | total_sg_needed -= sg_per_table; | |
192 | } | |
193 | ||
6708bb27 | 194 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
c66ac9db NB |
195 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
196 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
197 | rd_dev->sg_table_count); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static void *rd_allocate_virtdevice( | |
203 | struct se_hba *hba, | |
204 | const char *name, | |
205 | int rd_direct) | |
206 | { | |
207 | struct rd_dev *rd_dev; | |
208 | struct rd_host *rd_host = hba->hba_ptr; | |
209 | ||
210 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
211 | if (!rd_dev) { |
212 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
213 | return NULL; |
214 | } | |
215 | ||
216 | rd_dev->rd_host = rd_host; | |
217 | rd_dev->rd_direct = rd_direct; | |
218 | ||
219 | return rd_dev; | |
220 | } | |
221 | ||
c66ac9db NB |
222 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) |
223 | { | |
224 | return rd_allocate_virtdevice(hba, name, 0); | |
225 | } | |
226 | ||
227 | /* rd_create_virtdevice(): | |
228 | * | |
229 | * | |
230 | */ | |
231 | static struct se_device *rd_create_virtdevice( | |
232 | struct se_hba *hba, | |
233 | struct se_subsystem_dev *se_dev, | |
234 | void *p, | |
235 | int rd_direct) | |
236 | { | |
237 | struct se_device *dev; | |
238 | struct se_dev_limits dev_limits; | |
239 | struct rd_dev *rd_dev = p; | |
240 | struct rd_host *rd_host = hba->hba_ptr; | |
065f9716 | 241 | int dev_flags = 0, ret; |
c66ac9db NB |
242 | char prod[16], rev[4]; |
243 | ||
244 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
245 | ||
065f9716 DC |
246 | ret = rd_build_device_space(rd_dev); |
247 | if (ret < 0) | |
c66ac9db NB |
248 | goto fail; |
249 | ||
250 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
251 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
252 | RD_MCP_VERSION); | |
253 | ||
254 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
255 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
256 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
257 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
258 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
259 | ||
260 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 261 | &rd_mcp_template, se_dev, dev_flags, rd_dev, |
c66ac9db | 262 | &dev_limits, prod, rev); |
6708bb27 | 263 | if (!dev) |
c66ac9db NB |
264 | goto fail; |
265 | ||
266 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
267 | rd_dev->rd_queue_depth = dev->queue_depth; | |
268 | ||
6708bb27 | 269 | pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
c66ac9db NB |
270 | " %u pages in %u tables, %lu total bytes\n", |
271 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
272 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
273 | rd_dev->sg_table_count, | |
274 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
275 | ||
276 | return dev; | |
277 | ||
278 | fail: | |
279 | rd_release_device_space(rd_dev); | |
613640e4 | 280 | return ERR_PTR(ret); |
c66ac9db NB |
281 | } |
282 | ||
c66ac9db NB |
283 | static struct se_device *rd_MEMCPY_create_virtdevice( |
284 | struct se_hba *hba, | |
285 | struct se_subsystem_dev *se_dev, | |
286 | void *p) | |
287 | { | |
288 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
289 | } | |
290 | ||
291 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
292 | * | |
293 | * | |
294 | */ | |
295 | static void rd_free_device(void *p) | |
296 | { | |
297 | struct rd_dev *rd_dev = p; | |
298 | ||
299 | rd_release_device_space(rd_dev); | |
300 | kfree(rd_dev); | |
301 | } | |
302 | ||
303 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
304 | { | |
305 | return container_of(task, struct rd_request, rd_task); | |
306 | } | |
307 | ||
308 | static struct se_task * | |
6708bb27 | 309 | rd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
310 | { |
311 | struct rd_request *rd_req; | |
312 | ||
313 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
314 | if (!rd_req) { | |
6708bb27 | 315 | pr_err("Unable to allocate struct rd_request\n"); |
c66ac9db NB |
316 | return NULL; |
317 | } | |
c66ac9db NB |
318 | |
319 | return &rd_req->rd_task; | |
320 | } | |
321 | ||
322 | /* rd_get_sg_table(): | |
323 | * | |
324 | * | |
325 | */ | |
326 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
327 | { | |
328 | u32 i; | |
329 | struct rd_dev_sg_table *sg_table; | |
330 | ||
331 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
332 | sg_table = &rd_dev->sg_table_array[i]; | |
333 | if ((sg_table->page_start_offset <= page) && | |
334 | (sg_table->page_end_offset >= page)) | |
335 | return sg_table; | |
336 | } | |
337 | ||
6708bb27 | 338 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
339 | page); |
340 | ||
341 | return NULL; | |
342 | } | |
343 | ||
65b0c78d | 344 | static int rd_MEMCPY(struct rd_request *req, u32 read_rd) |
c66ac9db NB |
345 | { |
346 | struct se_task *task = &req->rd_task; | |
42bf829e | 347 | struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr; |
c66ac9db | 348 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
349 | struct scatterlist *rd_sg; |
350 | struct sg_mapping_iter m; | |
c66ac9db | 351 | u32 rd_offset = req->rd_offset; |
65b0c78d | 352 | u32 src_len; |
c66ac9db NB |
353 | |
354 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 355 | if (!table) |
e3d6f909 | 356 | return -EINVAL; |
c66ac9db | 357 | |
65b0c78d | 358 | rd_sg = &table->sg_table[req->rd_page - table->page_start_offset]; |
6708bb27 | 359 | |
65b0c78d SAS |
360 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
361 | dev->rd_dev_id, read_rd ? "Read" : "Write", | |
362 | task->task_lba, req->rd_size, req->rd_page, | |
363 | rd_offset); | |
c66ac9db | 364 | |
65b0c78d SAS |
365 | src_len = PAGE_SIZE - rd_offset; |
366 | sg_miter_start(&m, task->task_sg, task->task_sg_nents, | |
367 | read_rd ? SG_MITER_TO_SG : SG_MITER_FROM_SG); | |
c66ac9db | 368 | while (req->rd_size) { |
65b0c78d SAS |
369 | u32 len; |
370 | void *rd_addr; | |
c66ac9db | 371 | |
65b0c78d SAS |
372 | sg_miter_next(&m); |
373 | len = min((u32)m.length, src_len); | |
374 | m.consumed = len; | |
c66ac9db | 375 | |
65b0c78d | 376 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 377 | |
65b0c78d SAS |
378 | if (read_rd) |
379 | memcpy(m.addr, rd_addr, len); | |
380 | else | |
381 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 382 | |
65b0c78d SAS |
383 | req->rd_size -= len; |
384 | if (!req->rd_size) | |
c66ac9db NB |
385 | continue; |
386 | ||
65b0c78d SAS |
387 | src_len -= len; |
388 | if (src_len) { | |
389 | rd_offset += len; | |
c66ac9db NB |
390 | continue; |
391 | } | |
6708bb27 | 392 | |
65b0c78d SAS |
393 | /* rd page completed, next one please */ |
394 | req->rd_page++; | |
395 | rd_offset = 0; | |
396 | src_len = PAGE_SIZE; | |
397 | if (req->rd_page <= table->page_end_offset) { | |
398 | rd_sg++; | |
c66ac9db NB |
399 | continue; |
400 | } | |
6708bb27 | 401 | |
c66ac9db | 402 | table = rd_get_sg_table(dev, req->rd_page); |
65b0c78d SAS |
403 | if (!table) { |
404 | sg_miter_stop(&m); | |
e3d6f909 | 405 | return -EINVAL; |
65b0c78d | 406 | } |
c66ac9db | 407 | |
65b0c78d SAS |
408 | /* since we increment, the first sg entry is correct */ |
409 | rd_sg = table->sg_table; | |
c66ac9db | 410 | } |
65b0c78d | 411 | sg_miter_stop(&m); |
c66ac9db NB |
412 | return 0; |
413 | } | |
414 | ||
415 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
416 | * | |
417 | * | |
418 | */ | |
419 | static int rd_MEMCPY_do_task(struct se_task *task) | |
420 | { | |
42bf829e | 421 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db | 422 | struct rd_request *req = RD_REQ(task); |
5bff9e85 | 423 | u64 tmp; |
c66ac9db NB |
424 | int ret; |
425 | ||
5bff9e85 SAS |
426 | tmp = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
427 | req->rd_offset = do_div(tmp, PAGE_SIZE); | |
428 | req->rd_page = tmp; | |
c66ac9db NB |
429 | req->rd_size = task->task_size; |
430 | ||
65b0c78d | 431 | ret = rd_MEMCPY(req, task->task_data_direction == DMA_FROM_DEVICE); |
c66ac9db NB |
432 | if (ret != 0) |
433 | return ret; | |
434 | ||
435 | task->task_scsi_status = GOOD; | |
436 | transport_complete_task(task, 1); | |
03e98c9e | 437 | return 0; |
c66ac9db NB |
438 | } |
439 | ||
c66ac9db NB |
440 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
441 | * | |
442 | * | |
443 | */ | |
444 | static void rd_free_task(struct se_task *task) | |
445 | { | |
446 | kfree(RD_REQ(task)); | |
447 | } | |
448 | ||
449 | enum { | |
450 | Opt_rd_pages, Opt_err | |
451 | }; | |
452 | ||
453 | static match_table_t tokens = { | |
454 | {Opt_rd_pages, "rd_pages=%d"}, | |
455 | {Opt_err, NULL} | |
456 | }; | |
457 | ||
458 | static ssize_t rd_set_configfs_dev_params( | |
459 | struct se_hba *hba, | |
460 | struct se_subsystem_dev *se_dev, | |
461 | const char *page, | |
462 | ssize_t count) | |
463 | { | |
464 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
465 | char *orig, *ptr, *opts; | |
466 | substring_t args[MAX_OPT_ARGS]; | |
467 | int ret = 0, arg, token; | |
468 | ||
469 | opts = kstrdup(page, GFP_KERNEL); | |
470 | if (!opts) | |
471 | return -ENOMEM; | |
472 | ||
473 | orig = opts; | |
474 | ||
90c161b6 | 475 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
476 | if (!*ptr) |
477 | continue; | |
478 | ||
479 | token = match_token(ptr, tokens, args); | |
480 | switch (token) { | |
481 | case Opt_rd_pages: | |
482 | match_int(args, &arg); | |
483 | rd_dev->rd_page_count = arg; | |
6708bb27 | 484 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
485 | " Count: %u\n", rd_dev->rd_page_count); |
486 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
487 | break; | |
488 | default: | |
489 | break; | |
490 | } | |
491 | } | |
492 | ||
493 | kfree(orig); | |
494 | return (!ret) ? count : ret; | |
495 | } | |
496 | ||
497 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
498 | { | |
499 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
500 | ||
501 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
6708bb27 | 502 | pr_debug("Missing rd_pages= parameter\n"); |
e3d6f909 | 503 | return -EINVAL; |
c66ac9db NB |
504 | } |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static ssize_t rd_show_configfs_dev_params( | |
510 | struct se_hba *hba, | |
511 | struct se_subsystem_dev *se_dev, | |
512 | char *b) | |
513 | { | |
514 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
515 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
516 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
517 | "rd_direct" : "rd_mcp"); | |
518 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
519 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
520 | PAGE_SIZE, rd_dev->sg_table_count); | |
521 | return bl; | |
522 | } | |
523 | ||
c66ac9db NB |
524 | static u32 rd_get_device_rev(struct se_device *dev) |
525 | { | |
526 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
527 | } | |
528 | ||
529 | static u32 rd_get_device_type(struct se_device *dev) | |
530 | { | |
531 | return TYPE_DISK; | |
532 | } | |
533 | ||
534 | static sector_t rd_get_blocks(struct se_device *dev) | |
535 | { | |
536 | struct rd_dev *rd_dev = dev->dev_ptr; | |
537 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
e3d6f909 | 538 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
c66ac9db NB |
539 | |
540 | return blocks_long; | |
541 | } | |
542 | ||
c66ac9db NB |
543 | static struct se_subsystem_api rd_mcp_template = { |
544 | .name = "rd_mcp", | |
545 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
546 | .attach_hba = rd_attach_hba, | |
547 | .detach_hba = rd_detach_hba, | |
548 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
549 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
550 | .free_device = rd_free_device, | |
551 | .alloc_task = rd_alloc_task, | |
552 | .do_task = rd_MEMCPY_do_task, | |
553 | .free_task = rd_free_task, | |
554 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
555 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
556 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
c66ac9db NB |
557 | .get_device_rev = rd_get_device_rev, |
558 | .get_device_type = rd_get_device_type, | |
559 | .get_blocks = rd_get_blocks, | |
560 | }; | |
561 | ||
562 | int __init rd_module_init(void) | |
563 | { | |
564 | int ret; | |
565 | ||
c66ac9db NB |
566 | ret = transport_subsystem_register(&rd_mcp_template); |
567 | if (ret < 0) { | |
c66ac9db NB |
568 | return ret; |
569 | } | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | void rd_module_exit(void) | |
575 | { | |
c66ac9db NB |
576 | transport_subsystem_release(&rd_mcp_template); |
577 | } |