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> | |
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 | ||
c66ac9db NB |
46 | static struct se_subsystem_api rd_mcp_template; |
47 | ||
c66ac9db NB |
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); | |
6708bb27 AG |
57 | if (!rd_host) { |
58 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
59 | return -ENOMEM; |
60 | } | |
61 | ||
62 | rd_host->rd_host_id = host_id; | |
63 | ||
5951146d | 64 | hba->hba_ptr = rd_host; |
c66ac9db | 65 | |
6708bb27 | 66 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
67 | " Generic Target Core Stack %s\n", hba->hba_id, |
68 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
6708bb27 | 69 | pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
e3d6f909 AG |
70 | " MaxSectors: %u\n", hba->hba_id, |
71 | rd_host->rd_host_id, RD_MAX_SECTORS); | |
c66ac9db NB |
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 | ||
6708bb27 | 80 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
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]); | |
6708bb27 | 109 | if (pg) { |
c66ac9db NB |
110 | __free_page(pg); |
111 | page_count++; | |
112 | } | |
113 | } | |
114 | ||
115 | kfree(sg); | |
116 | } | |
117 | ||
6708bb27 | 118 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
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) { | |
6708bb27 | 143 | pr_err("Illegal page count: %u for Ramdisk device\n", |
c66ac9db | 144 | rd_dev->rd_page_count); |
065f9716 | 145 | return -EINVAL; |
c66ac9db NB |
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); | |
6708bb27 AG |
152 | if (!sg_table) { |
153 | pr_err("Unable to allocate memory for Ramdisk" | |
c66ac9db | 154 | " scatterlist tables\n"); |
065f9716 | 155 | return -ENOMEM; |
c66ac9db NB |
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); | |
6708bb27 AG |
167 | if (!sg) { |
168 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 169 | " for struct rd_dev\n"); |
065f9716 | 170 | return -ENOMEM; |
c66ac9db NB |
171 | } |
172 | ||
6708bb27 | 173 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
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); | |
6708bb27 AG |
183 | if (!pg) { |
184 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 185 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 186 | return -ENOMEM; |
c66ac9db NB |
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 | ||
6708bb27 | 196 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
c66ac9db NB |
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); | |
6708bb27 AG |
213 | if (!rd_dev) { |
214 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
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 | ||
c66ac9db NB |
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; | |
065f9716 | 243 | int dev_flags = 0, ret; |
c66ac9db NB |
244 | char prod[16], rev[4]; |
245 | ||
246 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
247 | ||
065f9716 DC |
248 | ret = rd_build_device_space(rd_dev); |
249 | if (ret < 0) | |
c66ac9db NB |
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, | |
5951146d | 263 | &rd_mcp_template, se_dev, dev_flags, rd_dev, |
c66ac9db | 264 | &dev_limits, prod, rev); |
6708bb27 | 265 | if (!dev) |
c66ac9db NB |
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 | ||
6708bb27 | 271 | pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
c66ac9db NB |
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); | |
613640e4 | 282 | return ERR_PTR(ret); |
c66ac9db NB |
283 | } |
284 | ||
c66ac9db NB |
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 * | |
6708bb27 | 311 | rd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
312 | { |
313 | struct rd_request *rd_req; | |
314 | ||
315 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
316 | if (!rd_req) { | |
6708bb27 | 317 | pr_err("Unable to allocate struct rd_request\n"); |
c66ac9db NB |
318 | return NULL; |
319 | } | |
c66ac9db NB |
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 | ||
6708bb27 | 340 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
341 | page); |
342 | ||
343 | return NULL; | |
344 | } | |
345 | ||
65b0c78d | 346 | static int rd_MEMCPY(struct rd_request *req, u32 read_rd) |
c66ac9db NB |
347 | { |
348 | struct se_task *task = &req->rd_task; | |
42bf829e | 349 | struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr; |
c66ac9db | 350 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
351 | struct scatterlist *rd_sg; |
352 | struct sg_mapping_iter m; | |
c66ac9db | 353 | u32 rd_offset = req->rd_offset; |
65b0c78d | 354 | u32 src_len; |
c66ac9db NB |
355 | |
356 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 357 | if (!table) |
e3d6f909 | 358 | return -EINVAL; |
c66ac9db | 359 | |
65b0c78d | 360 | rd_sg = &table->sg_table[req->rd_page - table->page_start_offset]; |
6708bb27 | 361 | |
65b0c78d SAS |
362 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
363 | dev->rd_dev_id, read_rd ? "Read" : "Write", | |
364 | task->task_lba, req->rd_size, req->rd_page, | |
365 | rd_offset); | |
c66ac9db | 366 | |
65b0c78d SAS |
367 | src_len = PAGE_SIZE - rd_offset; |
368 | sg_miter_start(&m, task->task_sg, task->task_sg_nents, | |
369 | read_rd ? SG_MITER_TO_SG : SG_MITER_FROM_SG); | |
c66ac9db | 370 | while (req->rd_size) { |
65b0c78d SAS |
371 | u32 len; |
372 | void *rd_addr; | |
c66ac9db | 373 | |
65b0c78d SAS |
374 | sg_miter_next(&m); |
375 | len = min((u32)m.length, src_len); | |
376 | m.consumed = len; | |
c66ac9db | 377 | |
65b0c78d | 378 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 379 | |
65b0c78d SAS |
380 | if (read_rd) |
381 | memcpy(m.addr, rd_addr, len); | |
382 | else | |
383 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 384 | |
65b0c78d SAS |
385 | req->rd_size -= len; |
386 | if (!req->rd_size) | |
c66ac9db NB |
387 | continue; |
388 | ||
65b0c78d SAS |
389 | src_len -= len; |
390 | if (src_len) { | |
391 | rd_offset += len; | |
c66ac9db NB |
392 | continue; |
393 | } | |
6708bb27 | 394 | |
65b0c78d SAS |
395 | /* rd page completed, next one please */ |
396 | req->rd_page++; | |
397 | rd_offset = 0; | |
398 | src_len = PAGE_SIZE; | |
399 | if (req->rd_page <= table->page_end_offset) { | |
400 | rd_sg++; | |
c66ac9db NB |
401 | continue; |
402 | } | |
6708bb27 | 403 | |
c66ac9db | 404 | table = rd_get_sg_table(dev, req->rd_page); |
65b0c78d SAS |
405 | if (!table) { |
406 | sg_miter_stop(&m); | |
e3d6f909 | 407 | return -EINVAL; |
65b0c78d | 408 | } |
c66ac9db | 409 | |
65b0c78d SAS |
410 | /* since we increment, the first sg entry is correct */ |
411 | rd_sg = table->sg_table; | |
c66ac9db | 412 | } |
65b0c78d | 413 | sg_miter_stop(&m); |
c66ac9db NB |
414 | return 0; |
415 | } | |
416 | ||
417 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
418 | * | |
419 | * | |
420 | */ | |
421 | static int rd_MEMCPY_do_task(struct se_task *task) | |
422 | { | |
42bf829e | 423 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db | 424 | struct rd_request *req = RD_REQ(task); |
5bff9e85 | 425 | u64 tmp; |
c66ac9db NB |
426 | int ret; |
427 | ||
5bff9e85 SAS |
428 | tmp = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
429 | req->rd_offset = do_div(tmp, PAGE_SIZE); | |
430 | req->rd_page = tmp; | |
c66ac9db NB |
431 | req->rd_size = task->task_size; |
432 | ||
65b0c78d | 433 | ret = rd_MEMCPY(req, task->task_data_direction == DMA_FROM_DEVICE); |
c66ac9db NB |
434 | if (ret != 0) |
435 | return ret; | |
436 | ||
437 | task->task_scsi_status = GOOD; | |
438 | transport_complete_task(task, 1); | |
03e98c9e | 439 | return 0; |
c66ac9db NB |
440 | } |
441 | ||
c66ac9db NB |
442 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
443 | * | |
444 | * | |
445 | */ | |
446 | static void rd_free_task(struct se_task *task) | |
447 | { | |
448 | kfree(RD_REQ(task)); | |
449 | } | |
450 | ||
451 | enum { | |
452 | Opt_rd_pages, Opt_err | |
453 | }; | |
454 | ||
455 | static match_table_t tokens = { | |
456 | {Opt_rd_pages, "rd_pages=%d"}, | |
457 | {Opt_err, NULL} | |
458 | }; | |
459 | ||
460 | static ssize_t rd_set_configfs_dev_params( | |
461 | struct se_hba *hba, | |
462 | struct se_subsystem_dev *se_dev, | |
463 | const char *page, | |
464 | ssize_t count) | |
465 | { | |
466 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
467 | char *orig, *ptr, *opts; | |
468 | substring_t args[MAX_OPT_ARGS]; | |
469 | int ret = 0, arg, token; | |
470 | ||
471 | opts = kstrdup(page, GFP_KERNEL); | |
472 | if (!opts) | |
473 | return -ENOMEM; | |
474 | ||
475 | orig = opts; | |
476 | ||
477 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
478 | if (!*ptr) | |
479 | continue; | |
480 | ||
481 | token = match_token(ptr, tokens, args); | |
482 | switch (token) { | |
483 | case Opt_rd_pages: | |
484 | match_int(args, &arg); | |
485 | rd_dev->rd_page_count = arg; | |
6708bb27 | 486 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
487 | " Count: %u\n", rd_dev->rd_page_count); |
488 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
489 | break; | |
490 | default: | |
491 | break; | |
492 | } | |
493 | } | |
494 | ||
495 | kfree(orig); | |
496 | return (!ret) ? count : ret; | |
497 | } | |
498 | ||
499 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
500 | { | |
501 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
502 | ||
503 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
6708bb27 | 504 | pr_debug("Missing rd_pages= parameter\n"); |
e3d6f909 | 505 | return -EINVAL; |
c66ac9db NB |
506 | } |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static ssize_t rd_show_configfs_dev_params( | |
512 | struct se_hba *hba, | |
513 | struct se_subsystem_dev *se_dev, | |
514 | char *b) | |
515 | { | |
516 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
517 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
518 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
519 | "rd_direct" : "rd_mcp"); | |
520 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
521 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
522 | PAGE_SIZE, rd_dev->sg_table_count); | |
523 | return bl; | |
524 | } | |
525 | ||
c66ac9db NB |
526 | static u32 rd_get_device_rev(struct se_device *dev) |
527 | { | |
528 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
529 | } | |
530 | ||
531 | static u32 rd_get_device_type(struct se_device *dev) | |
532 | { | |
533 | return TYPE_DISK; | |
534 | } | |
535 | ||
536 | static sector_t rd_get_blocks(struct se_device *dev) | |
537 | { | |
538 | struct rd_dev *rd_dev = dev->dev_ptr; | |
539 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
e3d6f909 | 540 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
c66ac9db NB |
541 | |
542 | return blocks_long; | |
543 | } | |
544 | ||
c66ac9db NB |
545 | static struct se_subsystem_api rd_mcp_template = { |
546 | .name = "rd_mcp", | |
547 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
548 | .attach_hba = rd_attach_hba, | |
549 | .detach_hba = rd_detach_hba, | |
550 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
551 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
552 | .free_device = rd_free_device, | |
553 | .alloc_task = rd_alloc_task, | |
554 | .do_task = rd_MEMCPY_do_task, | |
555 | .free_task = rd_free_task, | |
556 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
557 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
558 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
c66ac9db NB |
559 | .get_device_rev = rd_get_device_rev, |
560 | .get_device_type = rd_get_device_type, | |
561 | .get_blocks = rd_get_blocks, | |
562 | }; | |
563 | ||
564 | int __init rd_module_init(void) | |
565 | { | |
566 | int ret; | |
567 | ||
c66ac9db NB |
568 | ret = transport_subsystem_register(&rd_mcp_template); |
569 | if (ret < 0) { | |
c66ac9db NB |
570 | return ret; |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | void rd_module_exit(void) | |
577 | { | |
c66ac9db NB |
578 | transport_subsystem_release(&rd_mcp_template); |
579 | } |