Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_rd.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Ramdisk transport | |
5 | * specific functions. | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
c66ac9db NB |
30 | #include <linux/slab.h> |
31 | #include <linux/spinlock.h> | |
c66ac9db NB |
32 | #include <scsi/scsi.h> |
33 | #include <scsi/scsi_host.h> | |
34 | ||
35 | #include <target/target_core_base.h> | |
c4795fb2 | 36 | #include <target/target_core_backend.h> |
c66ac9db NB |
37 | |
38 | #include "target_core_rd.h" | |
39 | ||
0fd97ccf CH |
40 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
41 | { | |
42 | return container_of(dev, struct rd_dev, dev); | |
43 | } | |
c66ac9db | 44 | |
c66ac9db NB |
45 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
46 | * | |
47 | * | |
48 | */ | |
49 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
50 | { | |
51 | struct rd_host *rd_host; | |
52 | ||
53 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
54 | if (!rd_host) { |
55 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
56 | return -ENOMEM; |
57 | } | |
58 | ||
59 | rd_host->rd_host_id = host_id; | |
60 | ||
5951146d | 61 | hba->hba_ptr = rd_host; |
c66ac9db | 62 | |
6708bb27 | 63 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
64 | " Generic Target Core Stack %s\n", hba->hba_id, |
65 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
66 | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static void rd_detach_hba(struct se_hba *hba) | |
71 | { | |
72 | struct rd_host *rd_host = hba->hba_ptr; | |
73 | ||
6708bb27 | 74 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
75 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
76 | ||
77 | kfree(rd_host); | |
78 | hba->hba_ptr = NULL; | |
79 | } | |
80 | ||
4442dc8a NB |
81 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
82 | u32 sg_table_count) | |
c66ac9db | 83 | { |
c66ac9db NB |
84 | struct page *pg; |
85 | struct scatterlist *sg; | |
4442dc8a | 86 | u32 i, j, page_count = 0, sg_per_table; |
c66ac9db | 87 | |
4442dc8a | 88 | for (i = 0; i < sg_table_count; i++) { |
c66ac9db NB |
89 | sg = sg_table[i].sg_table; |
90 | sg_per_table = sg_table[i].rd_sg_count; | |
91 | ||
92 | for (j = 0; j < sg_per_table; j++) { | |
93 | pg = sg_page(&sg[j]); | |
6708bb27 | 94 | if (pg) { |
c66ac9db NB |
95 | __free_page(pg); |
96 | page_count++; | |
97 | } | |
98 | } | |
c66ac9db NB |
99 | kfree(sg); |
100 | } | |
101 | ||
4442dc8a NB |
102 | kfree(sg_table); |
103 | return page_count; | |
104 | } | |
105 | ||
106 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
107 | { | |
108 | u32 page_count; | |
109 | ||
110 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
111 | return; | |
112 | ||
113 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, | |
114 | rd_dev->sg_table_count); | |
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 | ||
c66ac9db NB |
121 | rd_dev->sg_table_array = NULL; |
122 | rd_dev->sg_table_count = 0; | |
123 | } | |
124 | ||
125 | ||
126 | /* rd_build_device_space(): | |
127 | * | |
128 | * | |
129 | */ | |
4442dc8a NB |
130 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
131 | u32 total_sg_needed, unsigned char init_payload) | |
c66ac9db | 132 | { |
4442dc8a | 133 | u32 i = 0, j, page_offset = 0, sg_per_table; |
c66ac9db NB |
134 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
135 | sizeof(struct scatterlist)); | |
c66ac9db NB |
136 | struct page *pg; |
137 | struct scatterlist *sg; | |
4442dc8a | 138 | unsigned char *p; |
c66ac9db NB |
139 | |
140 | while (total_sg_needed) { | |
141 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
142 | max_sg_per_table : total_sg_needed; | |
143 | ||
144 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
145 | GFP_KERNEL); | |
6708bb27 AG |
146 | if (!sg) { |
147 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 148 | " for struct rd_dev\n"); |
065f9716 | 149 | return -ENOMEM; |
c66ac9db NB |
150 | } |
151 | ||
6708bb27 | 152 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
153 | |
154 | sg_table[i].sg_table = sg; | |
155 | sg_table[i].rd_sg_count = sg_per_table; | |
156 | sg_table[i].page_start_offset = page_offset; | |
157 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
158 | - 1; | |
159 | ||
160 | for (j = 0; j < sg_per_table; j++) { | |
161 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
162 | if (!pg) { |
163 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 164 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 165 | return -ENOMEM; |
c66ac9db NB |
166 | } |
167 | sg_assign_page(&sg[j], pg); | |
168 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
169 | |
170 | p = kmap(pg); | |
171 | memset(p, init_payload, PAGE_SIZE); | |
172 | kunmap(pg); | |
c66ac9db NB |
173 | } |
174 | ||
175 | page_offset += sg_per_table; | |
176 | total_sg_needed -= sg_per_table; | |
177 | } | |
178 | ||
4442dc8a NB |
179 | return 0; |
180 | } | |
181 | ||
182 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
183 | { | |
184 | struct rd_dev_sg_table *sg_table; | |
185 | u32 sg_tables, total_sg_needed; | |
186 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
187 | sizeof(struct scatterlist)); | |
188 | int rc; | |
189 | ||
190 | if (rd_dev->rd_page_count <= 0) { | |
191 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
192 | rd_dev->rd_page_count); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | /* Don't need backing pages for NULLIO */ | |
197 | if (rd_dev->rd_flags & RDF_NULLIO) | |
198 | return 0; | |
199 | ||
200 | total_sg_needed = rd_dev->rd_page_count; | |
201 | ||
202 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
203 | ||
204 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
205 | if (!sg_table) { | |
206 | pr_err("Unable to allocate memory for Ramdisk" | |
207 | " scatterlist tables\n"); | |
208 | return -ENOMEM; | |
209 | } | |
210 | ||
211 | rd_dev->sg_table_array = sg_table; | |
212 | rd_dev->sg_table_count = sg_tables; | |
213 | ||
214 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
215 | if (rc) | |
216 | return rc; | |
217 | ||
6708bb27 | 218 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
219 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
220 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
221 | rd_dev->sg_table_count); | |
c66ac9db NB |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
d7e8eb5d NB |
226 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
227 | { | |
228 | u32 page_count; | |
229 | ||
230 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
231 | return; | |
232 | ||
233 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
234 | rd_dev->sg_prot_count); | |
235 | ||
236 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
237 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
238 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
239 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
240 | ||
241 | rd_dev->sg_prot_array = NULL; | |
242 | rd_dev->sg_prot_count = 0; | |
243 | } | |
244 | ||
245 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length) | |
246 | { | |
247 | struct rd_dev_sg_table *sg_table; | |
248 | u32 total_sg_needed, sg_tables; | |
249 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
250 | sizeof(struct scatterlist)); | |
251 | int rc; | |
252 | ||
253 | if (rd_dev->rd_flags & RDF_NULLIO) | |
254 | return 0; | |
255 | ||
256 | total_sg_needed = rd_dev->rd_page_count / prot_length; | |
257 | ||
258 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
259 | ||
260 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
261 | if (!sg_table) { | |
262 | pr_err("Unable to allocate memory for Ramdisk protection" | |
263 | " scatterlist tables\n"); | |
264 | return -ENOMEM; | |
265 | } | |
266 | ||
267 | rd_dev->sg_prot_array = sg_table; | |
268 | rd_dev->sg_prot_count = sg_tables; | |
269 | ||
270 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
271 | if (rc) | |
272 | return rc; | |
273 | ||
274 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
275 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
276 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
0fd97ccf | 281 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
282 | { |
283 | struct rd_dev *rd_dev; | |
284 | struct rd_host *rd_host = hba->hba_ptr; | |
285 | ||
286 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
287 | if (!rd_dev) { |
288 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
289 | return NULL; |
290 | } | |
291 | ||
292 | rd_dev->rd_host = rd_host; | |
c66ac9db | 293 | |
0fd97ccf | 294 | return &rd_dev->dev; |
c66ac9db NB |
295 | } |
296 | ||
0fd97ccf | 297 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 298 | { |
0fd97ccf CH |
299 | struct rd_dev *rd_dev = RD_DEV(dev); |
300 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
301 | int ret; | |
c66ac9db | 302 | |
0fd97ccf CH |
303 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
304 | pr_debug("Missing rd_pages= parameter\n"); | |
305 | return -EINVAL; | |
306 | } | |
c66ac9db | 307 | |
065f9716 DC |
308 | ret = rd_build_device_space(rd_dev); |
309 | if (ret < 0) | |
c66ac9db NB |
310 | goto fail; |
311 | ||
0fd97ccf CH |
312 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
313 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
314 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
315 | |
316 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 317 | |
8feb58d0 | 318 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 319 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 320 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
321 | rd_dev->sg_table_count, |
322 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
323 | ||
0fd97ccf | 324 | return 0; |
c66ac9db NB |
325 | |
326 | fail: | |
327 | rd_release_device_space(rd_dev); | |
0fd97ccf | 328 | return ret; |
c66ac9db NB |
329 | } |
330 | ||
0fd97ccf | 331 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 332 | { |
0fd97ccf | 333 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
334 | |
335 | rd_release_device_space(rd_dev); | |
336 | kfree(rd_dev); | |
337 | } | |
338 | ||
c66ac9db NB |
339 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
340 | { | |
c66ac9db | 341 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
342 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
343 | sizeof(struct scatterlist)); | |
c66ac9db | 344 | |
8f67835f MS |
345 | i = page / sg_per_table; |
346 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
347 | sg_table = &rd_dev->sg_table_array[i]; |
348 | if ((sg_table->page_start_offset <= page) && | |
349 | (sg_table->page_end_offset >= page)) | |
350 | return sg_table; | |
351 | } | |
352 | ||
6708bb27 | 353 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
354 | page); |
355 | ||
356 | return NULL; | |
357 | } | |
358 | ||
6e611119 NB |
359 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
360 | { | |
361 | struct rd_dev_sg_table *sg_table; | |
362 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
363 | sizeof(struct scatterlist)); | |
364 | ||
365 | i = page / sg_per_table; | |
366 | if (i < rd_dev->sg_prot_count) { | |
367 | sg_table = &rd_dev->sg_prot_array[i]; | |
368 | if ((sg_table->page_start_offset <= page) && | |
369 | (sg_table->page_end_offset >= page)) | |
370 | return sg_table; | |
371 | } | |
372 | ||
373 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
374 | page); | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
de103c93 | 379 | static sense_reason_t |
a82a9538 NB |
380 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
381 | enum dma_data_direction data_direction) | |
c66ac9db | 382 | { |
5787cacd | 383 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 384 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 385 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
386 | struct scatterlist *rd_sg; |
387 | struct sg_mapping_iter m; | |
8feb58d0 CH |
388 | u32 rd_offset; |
389 | u32 rd_size; | |
390 | u32 rd_page; | |
65b0c78d | 391 | u32 src_len; |
8feb58d0 | 392 | u64 tmp; |
6e611119 | 393 | sense_reason_t rc; |
c66ac9db | 394 | |
52c07423 NB |
395 | if (dev->rd_flags & RDF_NULLIO) { |
396 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
397 | return 0; | |
398 | } | |
399 | ||
0fd97ccf | 400 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
401 | rd_offset = do_div(tmp, PAGE_SIZE); |
402 | rd_page = tmp; | |
5787cacd | 403 | rd_size = cmd->data_length; |
8feb58d0 CH |
404 | |
405 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 406 | if (!table) |
de103c93 | 407 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 408 | |
8feb58d0 | 409 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 410 | |
65b0c78d | 411 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 412 | dev->rd_dev_id, |
5787cacd CH |
413 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
414 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 415 | |
6e611119 NB |
416 | if (cmd->prot_type && data_direction == DMA_TO_DEVICE) { |
417 | struct rd_dev_sg_table *prot_table; | |
418 | struct scatterlist *prot_sg; | |
419 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
420 | u32 prot_offset, prot_page; | |
421 | ||
422 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
423 | prot_offset = do_div(tmp, PAGE_SIZE); | |
424 | prot_page = tmp; | |
425 | ||
426 | prot_table = rd_get_prot_table(dev, prot_page); | |
427 | if (!prot_table) | |
428 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
429 | ||
430 | prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset]; | |
431 | ||
432 | rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0, | |
433 | prot_sg, prot_offset); | |
434 | if (rc) | |
435 | return rc; | |
436 | } | |
437 | ||
65b0c78d | 438 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
439 | sg_miter_start(&m, sgl, sgl_nents, |
440 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
441 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
442 | while (rd_size) { | |
65b0c78d SAS |
443 | u32 len; |
444 | void *rd_addr; | |
c66ac9db | 445 | |
65b0c78d | 446 | sg_miter_next(&m); |
bbf344e5 HR |
447 | if (!(u32)m.length) { |
448 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
449 | dev->rd_dev_id, m.addr, m.length); | |
450 | sg_miter_stop(&m); | |
451 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
452 | } | |
65b0c78d | 453 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
454 | if (len > rd_size) { |
455 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
456 | "size %d\n", dev->rd_dev_id, | |
457 | rd_page, rd_offset, rd_size); | |
458 | len = rd_size; | |
459 | } | |
65b0c78d | 460 | m.consumed = len; |
c66ac9db | 461 | |
65b0c78d | 462 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 463 | |
5787cacd | 464 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
465 | memcpy(m.addr, rd_addr, len); |
466 | else | |
467 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 468 | |
8feb58d0 CH |
469 | rd_size -= len; |
470 | if (!rd_size) | |
c66ac9db NB |
471 | continue; |
472 | ||
65b0c78d SAS |
473 | src_len -= len; |
474 | if (src_len) { | |
475 | rd_offset += len; | |
c66ac9db NB |
476 | continue; |
477 | } | |
6708bb27 | 478 | |
65b0c78d | 479 | /* rd page completed, next one please */ |
8feb58d0 | 480 | rd_page++; |
65b0c78d SAS |
481 | rd_offset = 0; |
482 | src_len = PAGE_SIZE; | |
8feb58d0 | 483 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 484 | rd_sg++; |
c66ac9db NB |
485 | continue; |
486 | } | |
6708bb27 | 487 | |
8feb58d0 | 488 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
489 | if (!table) { |
490 | sg_miter_stop(&m); | |
de103c93 | 491 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 492 | } |
c66ac9db | 493 | |
65b0c78d SAS |
494 | /* since we increment, the first sg entry is correct */ |
495 | rd_sg = table->sg_table; | |
c66ac9db | 496 | } |
65b0c78d | 497 | sg_miter_stop(&m); |
c66ac9db | 498 | |
6e611119 NB |
499 | if (cmd->prot_type && data_direction == DMA_FROM_DEVICE) { |
500 | struct rd_dev_sg_table *prot_table; | |
501 | struct scatterlist *prot_sg; | |
502 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
503 | u32 prot_offset, prot_page; | |
504 | ||
505 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
506 | prot_offset = do_div(tmp, PAGE_SIZE); | |
507 | prot_page = tmp; | |
508 | ||
509 | prot_table = rd_get_prot_table(dev, prot_page); | |
510 | if (!prot_table) | |
511 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
512 | ||
513 | prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset]; | |
514 | ||
515 | rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, | |
516 | prot_sg, prot_offset); | |
517 | if (rc) | |
518 | return rc; | |
519 | } | |
520 | ||
5787cacd | 521 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 522 | return 0; |
c66ac9db NB |
523 | } |
524 | ||
c66ac9db | 525 | enum { |
52c07423 | 526 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
527 | }; |
528 | ||
529 | static match_table_t tokens = { | |
530 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 531 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
532 | {Opt_err, NULL} |
533 | }; | |
534 | ||
0fd97ccf CH |
535 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
536 | const char *page, ssize_t count) | |
c66ac9db | 537 | { |
0fd97ccf | 538 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
539 | char *orig, *ptr, *opts; |
540 | substring_t args[MAX_OPT_ARGS]; | |
541 | int ret = 0, arg, token; | |
542 | ||
543 | opts = kstrdup(page, GFP_KERNEL); | |
544 | if (!opts) | |
545 | return -ENOMEM; | |
546 | ||
547 | orig = opts; | |
548 | ||
90c161b6 | 549 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
550 | if (!*ptr) |
551 | continue; | |
552 | ||
553 | token = match_token(ptr, tokens, args); | |
554 | switch (token) { | |
555 | case Opt_rd_pages: | |
556 | match_int(args, &arg); | |
557 | rd_dev->rd_page_count = arg; | |
6708bb27 | 558 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
559 | " Count: %u\n", rd_dev->rd_page_count); |
560 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
561 | break; | |
52c07423 NB |
562 | case Opt_rd_nullio: |
563 | match_int(args, &arg); | |
564 | if (arg != 1) | |
565 | break; | |
566 | ||
567 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
568 | rd_dev->rd_flags |= RDF_NULLIO; | |
569 | break; | |
c66ac9db NB |
570 | default: |
571 | break; | |
572 | } | |
573 | } | |
574 | ||
575 | kfree(orig); | |
576 | return (!ret) ? count : ret; | |
577 | } | |
578 | ||
0fd97ccf | 579 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 580 | { |
0fd97ccf | 581 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 582 | |
8feb58d0 CH |
583 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
584 | rd_dev->rd_dev_id); | |
c66ac9db | 585 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
586 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
587 | PAGE_SIZE, rd_dev->sg_table_count, | |
588 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
589 | return bl; |
590 | } | |
591 | ||
c66ac9db NB |
592 | static sector_t rd_get_blocks(struct se_device *dev) |
593 | { | |
0fd97ccf CH |
594 | struct rd_dev *rd_dev = RD_DEV(dev); |
595 | ||
c66ac9db | 596 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 597 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
598 | |
599 | return blocks_long; | |
600 | } | |
601 | ||
d7e8eb5d NB |
602 | static int rd_init_prot(struct se_device *dev) |
603 | { | |
604 | struct rd_dev *rd_dev = RD_DEV(dev); | |
605 | ||
606 | if (!dev->dev_attrib.pi_prot_type) | |
607 | return 0; | |
608 | ||
609 | return rd_build_prot_space(rd_dev, dev->prot_length); | |
610 | } | |
611 | ||
612 | static void rd_free_prot(struct se_device *dev) | |
613 | { | |
614 | struct rd_dev *rd_dev = RD_DEV(dev); | |
615 | ||
616 | rd_release_prot_space(rd_dev); | |
617 | } | |
618 | ||
9e999a6c | 619 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
620 | .execute_rw = rd_execute_rw, |
621 | }; | |
622 | ||
de103c93 CH |
623 | static sense_reason_t |
624 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 625 | { |
9e999a6c | 626 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
627 | } |
628 | ||
c66ac9db NB |
629 | static struct se_subsystem_api rd_mcp_template = { |
630 | .name = "rd_mcp", | |
0fd97ccf CH |
631 | .inquiry_prod = "RAMDISK-MCP", |
632 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
633 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
634 | .attach_hba = rd_attach_hba, | |
635 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
636 | .alloc_device = rd_alloc_device, |
637 | .configure_device = rd_configure_device, | |
c66ac9db | 638 | .free_device = rd_free_device, |
0c2ad7d1 | 639 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
640 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
641 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 642 | .get_device_type = sbc_get_device_type, |
c66ac9db | 643 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
644 | .init_prot = rd_init_prot, |
645 | .free_prot = rd_free_prot, | |
c66ac9db NB |
646 | }; |
647 | ||
648 | int __init rd_module_init(void) | |
649 | { | |
650 | int ret; | |
651 | ||
c66ac9db NB |
652 | ret = transport_subsystem_register(&rd_mcp_template); |
653 | if (ret < 0) { | |
c66ac9db NB |
654 | return ret; |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | void rd_module_exit(void) | |
661 | { | |
c66ac9db NB |
662 | transport_subsystem_release(&rd_mcp_template); |
663 | } |