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> |
03a62745 | 37 | #include <target/target_core_backend_configfs.h> |
c66ac9db NB |
38 | |
39 | #include "target_core_rd.h" | |
40 | ||
0fd97ccf CH |
41 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
42 | { | |
43 | return container_of(dev, struct rd_dev, dev); | |
44 | } | |
c66ac9db | 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); | |
c66ac9db NB |
67 | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static void rd_detach_hba(struct se_hba *hba) | |
72 | { | |
73 | struct rd_host *rd_host = hba->hba_ptr; | |
74 | ||
6708bb27 | 75 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
76 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
77 | ||
78 | kfree(rd_host); | |
79 | hba->hba_ptr = NULL; | |
80 | } | |
81 | ||
4442dc8a NB |
82 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
83 | u32 sg_table_count) | |
c66ac9db | 84 | { |
c66ac9db NB |
85 | struct page *pg; |
86 | struct scatterlist *sg; | |
4442dc8a | 87 | u32 i, j, page_count = 0, sg_per_table; |
c66ac9db | 88 | |
4442dc8a | 89 | for (i = 0; i < sg_table_count; i++) { |
c66ac9db NB |
90 | sg = sg_table[i].sg_table; |
91 | sg_per_table = sg_table[i].rd_sg_count; | |
92 | ||
93 | for (j = 0; j < sg_per_table; j++) { | |
94 | pg = sg_page(&sg[j]); | |
6708bb27 | 95 | if (pg) { |
c66ac9db NB |
96 | __free_page(pg); |
97 | page_count++; | |
98 | } | |
99 | } | |
c66ac9db NB |
100 | kfree(sg); |
101 | } | |
102 | ||
4442dc8a NB |
103 | kfree(sg_table); |
104 | return page_count; | |
105 | } | |
106 | ||
107 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
108 | { | |
109 | u32 page_count; | |
110 | ||
111 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
112 | return; | |
113 | ||
114 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, | |
115 | rd_dev->sg_table_count); | |
116 | ||
6708bb27 | 117 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
118 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
119 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
120 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
121 | ||
c66ac9db NB |
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 | */ | |
4442dc8a NB |
131 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
132 | u32 total_sg_needed, unsigned char init_payload) | |
c66ac9db | 133 | { |
4442dc8a | 134 | u32 i = 0, j, page_offset = 0, sg_per_table; |
c66ac9db NB |
135 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
136 | sizeof(struct scatterlist)); | |
c66ac9db NB |
137 | struct page *pg; |
138 | struct scatterlist *sg; | |
4442dc8a | 139 | unsigned char *p; |
c66ac9db NB |
140 | |
141 | while (total_sg_needed) { | |
142 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
143 | max_sg_per_table : total_sg_needed; | |
144 | ||
145 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
146 | GFP_KERNEL); | |
6708bb27 AG |
147 | if (!sg) { |
148 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 149 | " for struct rd_dev\n"); |
065f9716 | 150 | return -ENOMEM; |
c66ac9db NB |
151 | } |
152 | ||
6708bb27 | 153 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
154 | |
155 | sg_table[i].sg_table = sg; | |
156 | sg_table[i].rd_sg_count = sg_per_table; | |
157 | sg_table[i].page_start_offset = page_offset; | |
158 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
159 | - 1; | |
160 | ||
161 | for (j = 0; j < sg_per_table; j++) { | |
162 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
163 | if (!pg) { |
164 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 165 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 166 | return -ENOMEM; |
c66ac9db NB |
167 | } |
168 | sg_assign_page(&sg[j], pg); | |
169 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
170 | |
171 | p = kmap(pg); | |
172 | memset(p, init_payload, PAGE_SIZE); | |
173 | kunmap(pg); | |
c66ac9db NB |
174 | } |
175 | ||
176 | page_offset += sg_per_table; | |
177 | total_sg_needed -= sg_per_table; | |
178 | } | |
179 | ||
4442dc8a NB |
180 | return 0; |
181 | } | |
182 | ||
183 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
184 | { | |
185 | struct rd_dev_sg_table *sg_table; | |
186 | u32 sg_tables, total_sg_needed; | |
187 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
188 | sizeof(struct scatterlist)); | |
189 | int rc; | |
190 | ||
191 | if (rd_dev->rd_page_count <= 0) { | |
192 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
193 | rd_dev->rd_page_count); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | /* Don't need backing pages for NULLIO */ | |
198 | if (rd_dev->rd_flags & RDF_NULLIO) | |
199 | return 0; | |
200 | ||
201 | total_sg_needed = rd_dev->rd_page_count; | |
202 | ||
203 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
204 | ||
205 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
206 | if (!sg_table) { | |
207 | pr_err("Unable to allocate memory for Ramdisk" | |
208 | " scatterlist tables\n"); | |
209 | return -ENOMEM; | |
210 | } | |
211 | ||
212 | rd_dev->sg_table_array = sg_table; | |
213 | rd_dev->sg_table_count = sg_tables; | |
214 | ||
215 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
216 | if (rc) | |
217 | return rc; | |
218 | ||
6708bb27 | 219 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
220 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
221 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
222 | rd_dev->sg_table_count); | |
c66ac9db NB |
223 | |
224 | return 0; | |
225 | } | |
226 | ||
d7e8eb5d NB |
227 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
228 | { | |
229 | u32 page_count; | |
230 | ||
231 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
232 | return; | |
233 | ||
234 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
235 | rd_dev->sg_prot_count); | |
236 | ||
237 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
238 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
239 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
240 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
241 | ||
242 | rd_dev->sg_prot_array = NULL; | |
243 | rd_dev->sg_prot_count = 0; | |
244 | } | |
245 | ||
9d2e59f2 | 246 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
247 | { |
248 | struct rd_dev_sg_table *sg_table; | |
249 | u32 total_sg_needed, sg_tables; | |
250 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
251 | sizeof(struct scatterlist)); | |
252 | int rc; | |
253 | ||
254 | if (rd_dev->rd_flags & RDF_NULLIO) | |
255 | return 0; | |
9d2e59f2 QT |
256 | /* |
257 | * prot_length=8byte dif data | |
258 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
259 | * (prot_length/block_size) + pad | |
260 | * PGSZ canceled each other. | |
261 | */ | |
262 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
263 | |
264 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
265 | ||
266 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
267 | if (!sg_table) { | |
268 | pr_err("Unable to allocate memory for Ramdisk protection" | |
269 | " scatterlist tables\n"); | |
270 | return -ENOMEM; | |
271 | } | |
272 | ||
273 | rd_dev->sg_prot_array = sg_table; | |
274 | rd_dev->sg_prot_count = sg_tables; | |
275 | ||
276 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
277 | if (rc) | |
278 | return rc; | |
279 | ||
280 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
281 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
282 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
0fd97ccf | 287 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
288 | { |
289 | struct rd_dev *rd_dev; | |
290 | struct rd_host *rd_host = hba->hba_ptr; | |
291 | ||
292 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
293 | if (!rd_dev) { |
294 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
295 | return NULL; |
296 | } | |
297 | ||
298 | rd_dev->rd_host = rd_host; | |
c66ac9db | 299 | |
0fd97ccf | 300 | return &rd_dev->dev; |
c66ac9db NB |
301 | } |
302 | ||
0fd97ccf | 303 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 304 | { |
0fd97ccf CH |
305 | struct rd_dev *rd_dev = RD_DEV(dev); |
306 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
307 | int ret; | |
c66ac9db | 308 | |
0fd97ccf CH |
309 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
310 | pr_debug("Missing rd_pages= parameter\n"); | |
311 | return -EINVAL; | |
312 | } | |
c66ac9db | 313 | |
065f9716 DC |
314 | ret = rd_build_device_space(rd_dev); |
315 | if (ret < 0) | |
c66ac9db NB |
316 | goto fail; |
317 | ||
0fd97ccf CH |
318 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
319 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
320 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
321 | |
322 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 323 | |
8feb58d0 | 324 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 325 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 326 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
327 | rd_dev->sg_table_count, |
328 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
329 | ||
0fd97ccf | 330 | return 0; |
c66ac9db NB |
331 | |
332 | fail: | |
333 | rd_release_device_space(rd_dev); | |
0fd97ccf | 334 | return ret; |
c66ac9db NB |
335 | } |
336 | ||
0fd97ccf | 337 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 338 | { |
0fd97ccf | 339 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
340 | |
341 | rd_release_device_space(rd_dev); | |
342 | kfree(rd_dev); | |
343 | } | |
344 | ||
c66ac9db NB |
345 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
346 | { | |
c66ac9db | 347 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
348 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
349 | sizeof(struct scatterlist)); | |
c66ac9db | 350 | |
8f67835f MS |
351 | i = page / sg_per_table; |
352 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
353 | sg_table = &rd_dev->sg_table_array[i]; |
354 | if ((sg_table->page_start_offset <= page) && | |
355 | (sg_table->page_end_offset >= page)) | |
356 | return sg_table; | |
357 | } | |
358 | ||
6708bb27 | 359 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
360 | page); |
361 | ||
362 | return NULL; | |
363 | } | |
364 | ||
6e611119 NB |
365 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
366 | { | |
367 | struct rd_dev_sg_table *sg_table; | |
368 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
369 | sizeof(struct scatterlist)); | |
370 | ||
371 | i = page / sg_per_table; | |
372 | if (i < rd_dev->sg_prot_count) { | |
373 | sg_table = &rd_dev->sg_prot_array[i]; | |
374 | if ((sg_table->page_start_offset <= page) && | |
375 | (sg_table->page_end_offset >= page)) | |
376 | return sg_table; | |
377 | } | |
378 | ||
379 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
380 | page); | |
381 | ||
382 | return NULL; | |
383 | } | |
384 | ||
de103c93 | 385 | static sense_reason_t |
a82a9538 NB |
386 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
387 | enum dma_data_direction data_direction) | |
c66ac9db | 388 | { |
5787cacd | 389 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 390 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 391 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
392 | struct scatterlist *rd_sg; |
393 | struct sg_mapping_iter m; | |
8feb58d0 CH |
394 | u32 rd_offset; |
395 | u32 rd_size; | |
396 | u32 rd_page; | |
65b0c78d | 397 | u32 src_len; |
8feb58d0 | 398 | u64 tmp; |
6e611119 | 399 | sense_reason_t rc; |
c66ac9db | 400 | |
52c07423 NB |
401 | if (dev->rd_flags & RDF_NULLIO) { |
402 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
403 | return 0; | |
404 | } | |
405 | ||
0fd97ccf | 406 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
407 | rd_offset = do_div(tmp, PAGE_SIZE); |
408 | rd_page = tmp; | |
5787cacd | 409 | rd_size = cmd->data_length; |
8feb58d0 CH |
410 | |
411 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 412 | if (!table) |
de103c93 | 413 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 414 | |
8feb58d0 | 415 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 416 | |
65b0c78d | 417 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 418 | dev->rd_dev_id, |
5787cacd CH |
419 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
420 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 421 | |
1762742f NB |
422 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
423 | data_direction == DMA_TO_DEVICE) { | |
6e611119 NB |
424 | struct rd_dev_sg_table *prot_table; |
425 | struct scatterlist *prot_sg; | |
426 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
427 | u32 prot_offset, prot_page; | |
428 | ||
429 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
430 | prot_offset = do_div(tmp, PAGE_SIZE); | |
431 | prot_page = tmp; | |
432 | ||
433 | prot_table = rd_get_prot_table(dev, prot_page); | |
434 | if (!prot_table) | |
435 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
436 | ||
437 | prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset]; | |
438 | ||
439 | rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0, | |
440 | prot_sg, prot_offset); | |
441 | if (rc) | |
442 | return rc; | |
443 | } | |
444 | ||
65b0c78d | 445 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
446 | sg_miter_start(&m, sgl, sgl_nents, |
447 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
448 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
449 | while (rd_size) { | |
65b0c78d SAS |
450 | u32 len; |
451 | void *rd_addr; | |
c66ac9db | 452 | |
65b0c78d | 453 | sg_miter_next(&m); |
bbf344e5 HR |
454 | if (!(u32)m.length) { |
455 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
456 | dev->rd_dev_id, m.addr, m.length); | |
457 | sg_miter_stop(&m); | |
458 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
459 | } | |
65b0c78d | 460 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
461 | if (len > rd_size) { |
462 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
463 | "size %d\n", dev->rd_dev_id, | |
464 | rd_page, rd_offset, rd_size); | |
465 | len = rd_size; | |
466 | } | |
65b0c78d | 467 | m.consumed = len; |
c66ac9db | 468 | |
65b0c78d | 469 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 470 | |
5787cacd | 471 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
472 | memcpy(m.addr, rd_addr, len); |
473 | else | |
474 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 475 | |
8feb58d0 CH |
476 | rd_size -= len; |
477 | if (!rd_size) | |
c66ac9db NB |
478 | continue; |
479 | ||
65b0c78d SAS |
480 | src_len -= len; |
481 | if (src_len) { | |
482 | rd_offset += len; | |
c66ac9db NB |
483 | continue; |
484 | } | |
6708bb27 | 485 | |
65b0c78d | 486 | /* rd page completed, next one please */ |
8feb58d0 | 487 | rd_page++; |
65b0c78d SAS |
488 | rd_offset = 0; |
489 | src_len = PAGE_SIZE; | |
8feb58d0 | 490 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 491 | rd_sg++; |
c66ac9db NB |
492 | continue; |
493 | } | |
6708bb27 | 494 | |
8feb58d0 | 495 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
496 | if (!table) { |
497 | sg_miter_stop(&m); | |
de103c93 | 498 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 499 | } |
c66ac9db | 500 | |
65b0c78d SAS |
501 | /* since we increment, the first sg entry is correct */ |
502 | rd_sg = table->sg_table; | |
c66ac9db | 503 | } |
65b0c78d | 504 | sg_miter_stop(&m); |
c66ac9db | 505 | |
1762742f NB |
506 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
507 | data_direction == DMA_FROM_DEVICE) { | |
6e611119 NB |
508 | struct rd_dev_sg_table *prot_table; |
509 | struct scatterlist *prot_sg; | |
510 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
511 | u32 prot_offset, prot_page; | |
512 | ||
513 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
514 | prot_offset = do_div(tmp, PAGE_SIZE); | |
515 | prot_page = tmp; | |
516 | ||
517 | prot_table = rd_get_prot_table(dev, prot_page); | |
518 | if (!prot_table) | |
519 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
520 | ||
521 | prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset]; | |
522 | ||
523 | rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, | |
524 | prot_sg, prot_offset); | |
525 | if (rc) | |
526 | return rc; | |
527 | } | |
528 | ||
5787cacd | 529 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 530 | return 0; |
c66ac9db NB |
531 | } |
532 | ||
c66ac9db | 533 | enum { |
52c07423 | 534 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
535 | }; |
536 | ||
537 | static match_table_t tokens = { | |
538 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 539 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
540 | {Opt_err, NULL} |
541 | }; | |
542 | ||
0fd97ccf CH |
543 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
544 | const char *page, ssize_t count) | |
c66ac9db | 545 | { |
0fd97ccf | 546 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
547 | char *orig, *ptr, *opts; |
548 | substring_t args[MAX_OPT_ARGS]; | |
549 | int ret = 0, arg, token; | |
550 | ||
551 | opts = kstrdup(page, GFP_KERNEL); | |
552 | if (!opts) | |
553 | return -ENOMEM; | |
554 | ||
555 | orig = opts; | |
556 | ||
90c161b6 | 557 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
558 | if (!*ptr) |
559 | continue; | |
560 | ||
561 | token = match_token(ptr, tokens, args); | |
562 | switch (token) { | |
563 | case Opt_rd_pages: | |
564 | match_int(args, &arg); | |
565 | rd_dev->rd_page_count = arg; | |
6708bb27 | 566 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
567 | " Count: %u\n", rd_dev->rd_page_count); |
568 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
569 | break; | |
52c07423 NB |
570 | case Opt_rd_nullio: |
571 | match_int(args, &arg); | |
572 | if (arg != 1) | |
573 | break; | |
574 | ||
575 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
576 | rd_dev->rd_flags |= RDF_NULLIO; | |
577 | break; | |
c66ac9db NB |
578 | default: |
579 | break; | |
580 | } | |
581 | } | |
582 | ||
583 | kfree(orig); | |
584 | return (!ret) ? count : ret; | |
585 | } | |
586 | ||
0fd97ccf | 587 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 588 | { |
0fd97ccf | 589 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 590 | |
8feb58d0 CH |
591 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
592 | rd_dev->rd_dev_id); | |
c66ac9db | 593 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
594 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
595 | PAGE_SIZE, rd_dev->sg_table_count, | |
596 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
597 | return bl; |
598 | } | |
599 | ||
c66ac9db NB |
600 | static sector_t rd_get_blocks(struct se_device *dev) |
601 | { | |
0fd97ccf CH |
602 | struct rd_dev *rd_dev = RD_DEV(dev); |
603 | ||
c66ac9db | 604 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 605 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
606 | |
607 | return blocks_long; | |
608 | } | |
609 | ||
d7e8eb5d NB |
610 | static int rd_init_prot(struct se_device *dev) |
611 | { | |
612 | struct rd_dev *rd_dev = RD_DEV(dev); | |
613 | ||
614 | if (!dev->dev_attrib.pi_prot_type) | |
615 | return 0; | |
616 | ||
9d2e59f2 QT |
617 | return rd_build_prot_space(rd_dev, dev->prot_length, |
618 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
619 | } |
620 | ||
621 | static void rd_free_prot(struct se_device *dev) | |
622 | { | |
623 | struct rd_dev *rd_dev = RD_DEV(dev); | |
624 | ||
625 | rd_release_prot_space(rd_dev); | |
626 | } | |
627 | ||
9e999a6c | 628 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
629 | .execute_rw = rd_execute_rw, |
630 | }; | |
631 | ||
de103c93 CH |
632 | static sense_reason_t |
633 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 634 | { |
9e999a6c | 635 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
636 | } |
637 | ||
03a62745 NB |
638 | DEF_TB_DEFAULT_ATTRIBS(rd_mcp); |
639 | ||
640 | static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = { | |
641 | &rd_mcp_dev_attrib_emulate_model_alias.attr, | |
642 | &rd_mcp_dev_attrib_emulate_dpo.attr, | |
643 | &rd_mcp_dev_attrib_emulate_fua_write.attr, | |
644 | &rd_mcp_dev_attrib_emulate_fua_read.attr, | |
645 | &rd_mcp_dev_attrib_emulate_write_cache.attr, | |
646 | &rd_mcp_dev_attrib_emulate_ua_intlck_ctrl.attr, | |
647 | &rd_mcp_dev_attrib_emulate_tas.attr, | |
648 | &rd_mcp_dev_attrib_emulate_tpu.attr, | |
649 | &rd_mcp_dev_attrib_emulate_tpws.attr, | |
650 | &rd_mcp_dev_attrib_emulate_caw.attr, | |
651 | &rd_mcp_dev_attrib_emulate_3pc.attr, | |
652 | &rd_mcp_dev_attrib_pi_prot_type.attr, | |
653 | &rd_mcp_dev_attrib_hw_pi_prot_type.attr, | |
654 | &rd_mcp_dev_attrib_pi_prot_format.attr, | |
655 | &rd_mcp_dev_attrib_enforce_pr_isids.attr, | |
656 | &rd_mcp_dev_attrib_is_nonrot.attr, | |
657 | &rd_mcp_dev_attrib_emulate_rest_reord.attr, | |
658 | &rd_mcp_dev_attrib_force_pr_aptpl.attr, | |
659 | &rd_mcp_dev_attrib_hw_block_size.attr, | |
660 | &rd_mcp_dev_attrib_block_size.attr, | |
661 | &rd_mcp_dev_attrib_hw_max_sectors.attr, | |
03a62745 NB |
662 | &rd_mcp_dev_attrib_optimal_sectors.attr, |
663 | &rd_mcp_dev_attrib_hw_queue_depth.attr, | |
664 | &rd_mcp_dev_attrib_queue_depth.attr, | |
665 | &rd_mcp_dev_attrib_max_unmap_lba_count.attr, | |
666 | &rd_mcp_dev_attrib_max_unmap_block_desc_count.attr, | |
667 | &rd_mcp_dev_attrib_unmap_granularity.attr, | |
668 | &rd_mcp_dev_attrib_unmap_granularity_alignment.attr, | |
669 | &rd_mcp_dev_attrib_max_write_same_len.attr, | |
670 | NULL, | |
671 | }; | |
672 | ||
c66ac9db NB |
673 | static struct se_subsystem_api rd_mcp_template = { |
674 | .name = "rd_mcp", | |
0fd97ccf CH |
675 | .inquiry_prod = "RAMDISK-MCP", |
676 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
677 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
678 | .attach_hba = rd_attach_hba, | |
679 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
680 | .alloc_device = rd_alloc_device, |
681 | .configure_device = rd_configure_device, | |
c66ac9db | 682 | .free_device = rd_free_device, |
0c2ad7d1 | 683 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
684 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
685 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 686 | .get_device_type = sbc_get_device_type, |
c66ac9db | 687 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
688 | .init_prot = rd_init_prot, |
689 | .free_prot = rd_free_prot, | |
c66ac9db NB |
690 | }; |
691 | ||
692 | int __init rd_module_init(void) | |
693 | { | |
03a62745 | 694 | struct target_backend_cits *tbc = &rd_mcp_template.tb_cits; |
c66ac9db NB |
695 | int ret; |
696 | ||
03a62745 NB |
697 | target_core_setup_sub_cits(&rd_mcp_template); |
698 | tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs; | |
699 | ||
c66ac9db NB |
700 | ret = transport_subsystem_register(&rd_mcp_template); |
701 | if (ret < 0) { | |
c66ac9db NB |
702 | return ret; |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
708 | void rd_module_exit(void) | |
709 | { | |
c66ac9db NB |
710 | transport_subsystem_release(&rd_mcp_template); |
711 | } |