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> | |
ba929992 | 32 | #include <scsi/scsi_proto.h> |
c66ac9db NB |
33 | |
34 | #include <target/target_core_base.h> | |
c4795fb2 | 35 | #include <target/target_core_backend.h> |
c66ac9db NB |
36 | |
37 | #include "target_core_rd.h" | |
38 | ||
0fd97ccf CH |
39 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
40 | { | |
41 | return container_of(dev, struct rd_dev, dev); | |
42 | } | |
c66ac9db | 43 | |
c66ac9db NB |
44 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
45 | { | |
46 | struct rd_host *rd_host; | |
47 | ||
48 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
49 | if (!rd_host) { |
50 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
51 | return -ENOMEM; |
52 | } | |
53 | ||
54 | rd_host->rd_host_id = host_id; | |
55 | ||
5951146d | 56 | hba->hba_ptr = rd_host; |
c66ac9db | 57 | |
6708bb27 | 58 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db | 59 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 60 | RD_HBA_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
61 | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void rd_detach_hba(struct se_hba *hba) | |
66 | { | |
67 | struct rd_host *rd_host = hba->hba_ptr; | |
68 | ||
6708bb27 | 69 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
70 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
71 | ||
72 | kfree(rd_host); | |
73 | hba->hba_ptr = NULL; | |
74 | } | |
75 | ||
4442dc8a NB |
76 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
77 | u32 sg_table_count) | |
c66ac9db | 78 | { |
c66ac9db NB |
79 | struct page *pg; |
80 | struct scatterlist *sg; | |
4442dc8a | 81 | u32 i, j, page_count = 0, sg_per_table; |
c66ac9db | 82 | |
4442dc8a | 83 | for (i = 0; i < sg_table_count; i++) { |
c66ac9db NB |
84 | sg = sg_table[i].sg_table; |
85 | sg_per_table = sg_table[i].rd_sg_count; | |
86 | ||
87 | for (j = 0; j < sg_per_table; j++) { | |
88 | pg = sg_page(&sg[j]); | |
6708bb27 | 89 | if (pg) { |
c66ac9db NB |
90 | __free_page(pg); |
91 | page_count++; | |
92 | } | |
93 | } | |
c66ac9db NB |
94 | kfree(sg); |
95 | } | |
96 | ||
4442dc8a NB |
97 | kfree(sg_table); |
98 | return page_count; | |
99 | } | |
100 | ||
101 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
102 | { | |
103 | u32 page_count; | |
104 | ||
105 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
106 | return; | |
107 | ||
108 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, | |
109 | rd_dev->sg_table_count); | |
110 | ||
6708bb27 | 111 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
112 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
113 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
114 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
115 | ||
c66ac9db NB |
116 | rd_dev->sg_table_array = NULL; |
117 | rd_dev->sg_table_count = 0; | |
118 | } | |
119 | ||
120 | ||
121 | /* rd_build_device_space(): | |
122 | * | |
123 | * | |
124 | */ | |
4442dc8a NB |
125 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
126 | u32 total_sg_needed, unsigned char init_payload) | |
c66ac9db | 127 | { |
4442dc8a | 128 | u32 i = 0, j, page_offset = 0, sg_per_table; |
c66ac9db NB |
129 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
130 | sizeof(struct scatterlist)); | |
c66ac9db NB |
131 | struct page *pg; |
132 | struct scatterlist *sg; | |
4442dc8a | 133 | unsigned char *p; |
c66ac9db NB |
134 | |
135 | while (total_sg_needed) { | |
bfd9a53e AM |
136 | unsigned int chain_entry = 0; |
137 | ||
c66ac9db NB |
138 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
139 | max_sg_per_table : total_sg_needed; | |
140 | ||
bfd9a53e AM |
141 | /* |
142 | * Reserve extra element for chain entry | |
143 | */ | |
144 | if (sg_per_table < total_sg_needed) | |
145 | chain_entry = 1; | |
146 | ||
bfd9a53e | 147 | sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), |
c66ac9db | 148 | GFP_KERNEL); |
6708bb27 AG |
149 | if (!sg) { |
150 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 151 | " for struct rd_dev\n"); |
065f9716 | 152 | return -ENOMEM; |
c66ac9db NB |
153 | } |
154 | ||
bfd9a53e AM |
155 | sg_init_table(sg, sg_per_table + chain_entry); |
156 | ||
bfd9a53e AM |
157 | if (i > 0) { |
158 | sg_chain(sg_table[i - 1].sg_table, | |
159 | max_sg_per_table + 1, sg); | |
160 | } | |
161 | ||
c66ac9db NB |
162 | sg_table[i].sg_table = sg; |
163 | sg_table[i].rd_sg_count = sg_per_table; | |
164 | sg_table[i].page_start_offset = page_offset; | |
165 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
166 | - 1; | |
167 | ||
168 | for (j = 0; j < sg_per_table; j++) { | |
169 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
170 | if (!pg) { |
171 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 172 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 173 | return -ENOMEM; |
c66ac9db NB |
174 | } |
175 | sg_assign_page(&sg[j], pg); | |
176 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
177 | |
178 | p = kmap(pg); | |
179 | memset(p, init_payload, PAGE_SIZE); | |
180 | kunmap(pg); | |
c66ac9db NB |
181 | } |
182 | ||
183 | page_offset += sg_per_table; | |
184 | total_sg_needed -= sg_per_table; | |
185 | } | |
186 | ||
4442dc8a NB |
187 | return 0; |
188 | } | |
189 | ||
190 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
191 | { | |
192 | struct rd_dev_sg_table *sg_table; | |
193 | u32 sg_tables, total_sg_needed; | |
194 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
195 | sizeof(struct scatterlist)); | |
196 | int rc; | |
197 | ||
198 | if (rd_dev->rd_page_count <= 0) { | |
199 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
200 | rd_dev->rd_page_count); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | /* Don't need backing pages for NULLIO */ | |
205 | if (rd_dev->rd_flags & RDF_NULLIO) | |
206 | return 0; | |
207 | ||
208 | total_sg_needed = rd_dev->rd_page_count; | |
209 | ||
210 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
211 | ||
212 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
213 | if (!sg_table) { | |
214 | pr_err("Unable to allocate memory for Ramdisk" | |
215 | " scatterlist tables\n"); | |
216 | return -ENOMEM; | |
217 | } | |
218 | ||
219 | rd_dev->sg_table_array = sg_table; | |
220 | rd_dev->sg_table_count = sg_tables; | |
221 | ||
222 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
223 | if (rc) | |
224 | return rc; | |
225 | ||
6708bb27 | 226 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
227 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
228 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
229 | rd_dev->sg_table_count); | |
c66ac9db NB |
230 | |
231 | return 0; | |
232 | } | |
233 | ||
d7e8eb5d NB |
234 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
235 | { | |
236 | u32 page_count; | |
237 | ||
238 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
239 | return; | |
240 | ||
241 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
242 | rd_dev->sg_prot_count); | |
243 | ||
244 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
245 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
246 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
247 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
248 | ||
249 | rd_dev->sg_prot_array = NULL; | |
250 | rd_dev->sg_prot_count = 0; | |
251 | } | |
252 | ||
9d2e59f2 | 253 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
254 | { |
255 | struct rd_dev_sg_table *sg_table; | |
256 | u32 total_sg_needed, sg_tables; | |
257 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
258 | sizeof(struct scatterlist)); | |
259 | int rc; | |
260 | ||
261 | if (rd_dev->rd_flags & RDF_NULLIO) | |
262 | return 0; | |
9d2e59f2 QT |
263 | /* |
264 | * prot_length=8byte dif data | |
265 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
266 | * (prot_length/block_size) + pad | |
267 | * PGSZ canceled each other. | |
268 | */ | |
269 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
270 | |
271 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
272 | ||
273 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
274 | if (!sg_table) { | |
275 | pr_err("Unable to allocate memory for Ramdisk protection" | |
276 | " scatterlist tables\n"); | |
277 | return -ENOMEM; | |
278 | } | |
279 | ||
280 | rd_dev->sg_prot_array = sg_table; | |
281 | rd_dev->sg_prot_count = sg_tables; | |
282 | ||
283 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
284 | if (rc) | |
285 | return rc; | |
286 | ||
287 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
288 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
289 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
0fd97ccf | 294 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
295 | { |
296 | struct rd_dev *rd_dev; | |
297 | struct rd_host *rd_host = hba->hba_ptr; | |
298 | ||
299 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
300 | if (!rd_dev) { |
301 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
302 | return NULL; |
303 | } | |
304 | ||
305 | rd_dev->rd_host = rd_host; | |
c66ac9db | 306 | |
0fd97ccf | 307 | return &rd_dev->dev; |
c66ac9db NB |
308 | } |
309 | ||
0fd97ccf | 310 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 311 | { |
0fd97ccf CH |
312 | struct rd_dev *rd_dev = RD_DEV(dev); |
313 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
314 | int ret; | |
c66ac9db | 315 | |
0fd97ccf CH |
316 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
317 | pr_debug("Missing rd_pages= parameter\n"); | |
318 | return -EINVAL; | |
319 | } | |
c66ac9db | 320 | |
065f9716 DC |
321 | ret = rd_build_device_space(rd_dev); |
322 | if (ret < 0) | |
c66ac9db NB |
323 | goto fail; |
324 | ||
0fd97ccf CH |
325 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
326 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
327 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
5dacbfc9 | 328 | dev->dev_attrib.is_nonrot = 1; |
c66ac9db NB |
329 | |
330 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 331 | |
8feb58d0 | 332 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 333 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 334 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
335 | rd_dev->sg_table_count, |
336 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
337 | ||
0fd97ccf | 338 | return 0; |
c66ac9db NB |
339 | |
340 | fail: | |
341 | rd_release_device_space(rd_dev); | |
0fd97ccf | 342 | return ret; |
c66ac9db NB |
343 | } |
344 | ||
4cc987ea NB |
345 | static void rd_dev_call_rcu(struct rcu_head *p) |
346 | { | |
347 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
348 | struct rd_dev *rd_dev = RD_DEV(dev); | |
349 | ||
350 | kfree(rd_dev); | |
351 | } | |
352 | ||
0fd97ccf | 353 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 354 | { |
0fd97ccf | 355 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
356 | |
357 | rd_release_device_space(rd_dev); | |
4cc987ea | 358 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); |
c66ac9db NB |
359 | } |
360 | ||
c66ac9db NB |
361 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
362 | { | |
c66ac9db | 363 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
364 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
365 | sizeof(struct scatterlist)); | |
c66ac9db | 366 | |
8f67835f MS |
367 | i = page / sg_per_table; |
368 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
369 | sg_table = &rd_dev->sg_table_array[i]; |
370 | if ((sg_table->page_start_offset <= page) && | |
371 | (sg_table->page_end_offset >= page)) | |
372 | return sg_table; | |
373 | } | |
374 | ||
6708bb27 | 375 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
376 | page); |
377 | ||
378 | return NULL; | |
379 | } | |
380 | ||
6e611119 NB |
381 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
382 | { | |
383 | struct rd_dev_sg_table *sg_table; | |
384 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
385 | sizeof(struct scatterlist)); | |
386 | ||
387 | i = page / sg_per_table; | |
388 | if (i < rd_dev->sg_prot_count) { | |
389 | sg_table = &rd_dev->sg_prot_array[i]; | |
390 | if ((sg_table->page_start_offset <= page) && | |
391 | (sg_table->page_end_offset >= page)) | |
392 | return sg_table; | |
393 | } | |
394 | ||
395 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
396 | page); | |
397 | ||
398 | return NULL; | |
399 | } | |
400 | ||
f75b6fae | 401 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
6766cc81 AM |
402 | { |
403 | struct se_device *se_dev = cmd->se_dev; | |
404 | struct rd_dev *dev = RD_DEV(se_dev); | |
405 | struct rd_dev_sg_table *prot_table; | |
bfd9a53e | 406 | bool need_to_release = false; |
6766cc81 AM |
407 | struct scatterlist *prot_sg; |
408 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
409 | u32 prot_offset, prot_page; | |
bfd9a53e | 410 | u32 prot_npages __maybe_unused; |
6766cc81 | 411 | u64 tmp; |
bfd9a53e | 412 | sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
6766cc81 AM |
413 | |
414 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
415 | prot_offset = do_div(tmp, PAGE_SIZE); | |
416 | prot_page = tmp; | |
417 | ||
418 | prot_table = rd_get_prot_table(dev, prot_page); | |
419 | if (!prot_table) | |
420 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
421 | ||
422 | prot_sg = &prot_table->sg_table[prot_page - | |
423 | prot_table->page_start_offset]; | |
424 | ||
f75b6fae SG |
425 | if (is_read) |
426 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
427 | prot_sg, prot_offset); | |
428 | else | |
429 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
430 | cmd->t_prot_sg, 0); | |
431 | ||
432 | if (!rc) | |
433 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); | |
434 | ||
bfd9a53e AM |
435 | if (need_to_release) |
436 | kfree(prot_sg); | |
6766cc81 AM |
437 | |
438 | return rc; | |
439 | } | |
440 | ||
de103c93 | 441 | static sense_reason_t |
a82a9538 NB |
442 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
443 | enum dma_data_direction data_direction) | |
c66ac9db | 444 | { |
5787cacd | 445 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 446 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 447 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
448 | struct scatterlist *rd_sg; |
449 | struct sg_mapping_iter m; | |
8feb58d0 CH |
450 | u32 rd_offset; |
451 | u32 rd_size; | |
452 | u32 rd_page; | |
65b0c78d | 453 | u32 src_len; |
8feb58d0 | 454 | u64 tmp; |
6e611119 | 455 | sense_reason_t rc; |
c66ac9db | 456 | |
52c07423 NB |
457 | if (dev->rd_flags & RDF_NULLIO) { |
458 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
459 | return 0; | |
460 | } | |
461 | ||
0fd97ccf | 462 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
463 | rd_offset = do_div(tmp, PAGE_SIZE); |
464 | rd_page = tmp; | |
5787cacd | 465 | rd_size = cmd->data_length; |
8feb58d0 CH |
466 | |
467 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 468 | if (!table) |
de103c93 | 469 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 470 | |
8feb58d0 | 471 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 472 | |
65b0c78d | 473 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 474 | dev->rd_dev_id, |
5787cacd CH |
475 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
476 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 477 | |
1762742f NB |
478 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
479 | data_direction == DMA_TO_DEVICE) { | |
f75b6fae | 480 | rc = rd_do_prot_rw(cmd, false); |
6e611119 NB |
481 | if (rc) |
482 | return rc; | |
483 | } | |
484 | ||
65b0c78d | 485 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
486 | sg_miter_start(&m, sgl, sgl_nents, |
487 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
488 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
489 | while (rd_size) { | |
65b0c78d SAS |
490 | u32 len; |
491 | void *rd_addr; | |
c66ac9db | 492 | |
65b0c78d | 493 | sg_miter_next(&m); |
bbf344e5 HR |
494 | if (!(u32)m.length) { |
495 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
496 | dev->rd_dev_id, m.addr, m.length); | |
497 | sg_miter_stop(&m); | |
498 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
499 | } | |
65b0c78d | 500 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
501 | if (len > rd_size) { |
502 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
503 | "size %d\n", dev->rd_dev_id, | |
504 | rd_page, rd_offset, rd_size); | |
505 | len = rd_size; | |
506 | } | |
65b0c78d | 507 | m.consumed = len; |
c66ac9db | 508 | |
65b0c78d | 509 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 510 | |
5787cacd | 511 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
512 | memcpy(m.addr, rd_addr, len); |
513 | else | |
514 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 515 | |
8feb58d0 CH |
516 | rd_size -= len; |
517 | if (!rd_size) | |
c66ac9db NB |
518 | continue; |
519 | ||
65b0c78d SAS |
520 | src_len -= len; |
521 | if (src_len) { | |
522 | rd_offset += len; | |
c66ac9db NB |
523 | continue; |
524 | } | |
6708bb27 | 525 | |
65b0c78d | 526 | /* rd page completed, next one please */ |
8feb58d0 | 527 | rd_page++; |
65b0c78d SAS |
528 | rd_offset = 0; |
529 | src_len = PAGE_SIZE; | |
8feb58d0 | 530 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 531 | rd_sg++; |
c66ac9db NB |
532 | continue; |
533 | } | |
6708bb27 | 534 | |
8feb58d0 | 535 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
536 | if (!table) { |
537 | sg_miter_stop(&m); | |
de103c93 | 538 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 539 | } |
c66ac9db | 540 | |
65b0c78d SAS |
541 | /* since we increment, the first sg entry is correct */ |
542 | rd_sg = table->sg_table; | |
c66ac9db | 543 | } |
65b0c78d | 544 | sg_miter_stop(&m); |
c66ac9db | 545 | |
1762742f NB |
546 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
547 | data_direction == DMA_FROM_DEVICE) { | |
f75b6fae | 548 | rc = rd_do_prot_rw(cmd, true); |
6e611119 NB |
549 | if (rc) |
550 | return rc; | |
551 | } | |
552 | ||
5787cacd | 553 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 554 | return 0; |
c66ac9db NB |
555 | } |
556 | ||
c66ac9db | 557 | enum { |
52c07423 | 558 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
559 | }; |
560 | ||
561 | static match_table_t tokens = { | |
562 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 563 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
564 | {Opt_err, NULL} |
565 | }; | |
566 | ||
0fd97ccf CH |
567 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
568 | const char *page, ssize_t count) | |
c66ac9db | 569 | { |
0fd97ccf | 570 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
571 | char *orig, *ptr, *opts; |
572 | substring_t args[MAX_OPT_ARGS]; | |
573 | int ret = 0, arg, token; | |
574 | ||
575 | opts = kstrdup(page, GFP_KERNEL); | |
576 | if (!opts) | |
577 | return -ENOMEM; | |
578 | ||
579 | orig = opts; | |
580 | ||
90c161b6 | 581 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
582 | if (!*ptr) |
583 | continue; | |
584 | ||
585 | token = match_token(ptr, tokens, args); | |
586 | switch (token) { | |
587 | case Opt_rd_pages: | |
588 | match_int(args, &arg); | |
589 | rd_dev->rd_page_count = arg; | |
6708bb27 | 590 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
591 | " Count: %u\n", rd_dev->rd_page_count); |
592 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
593 | break; | |
52c07423 NB |
594 | case Opt_rd_nullio: |
595 | match_int(args, &arg); | |
596 | if (arg != 1) | |
597 | break; | |
598 | ||
599 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
600 | rd_dev->rd_flags |= RDF_NULLIO; | |
601 | break; | |
c66ac9db NB |
602 | default: |
603 | break; | |
604 | } | |
605 | } | |
606 | ||
607 | kfree(orig); | |
608 | return (!ret) ? count : ret; | |
609 | } | |
610 | ||
0fd97ccf | 611 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 612 | { |
0fd97ccf | 613 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 614 | |
8feb58d0 CH |
615 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
616 | rd_dev->rd_dev_id); | |
c66ac9db | 617 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
618 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
619 | PAGE_SIZE, rd_dev->sg_table_count, | |
620 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
621 | return bl; |
622 | } | |
623 | ||
c66ac9db NB |
624 | static sector_t rd_get_blocks(struct se_device *dev) |
625 | { | |
0fd97ccf CH |
626 | struct rd_dev *rd_dev = RD_DEV(dev); |
627 | ||
c66ac9db | 628 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 629 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
630 | |
631 | return blocks_long; | |
632 | } | |
633 | ||
d7e8eb5d NB |
634 | static int rd_init_prot(struct se_device *dev) |
635 | { | |
636 | struct rd_dev *rd_dev = RD_DEV(dev); | |
637 | ||
638 | if (!dev->dev_attrib.pi_prot_type) | |
639 | return 0; | |
640 | ||
9d2e59f2 QT |
641 | return rd_build_prot_space(rd_dev, dev->prot_length, |
642 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
643 | } |
644 | ||
645 | static void rd_free_prot(struct se_device *dev) | |
646 | { | |
647 | struct rd_dev *rd_dev = RD_DEV(dev); | |
648 | ||
649 | rd_release_prot_space(rd_dev); | |
650 | } | |
651 | ||
9e999a6c | 652 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
653 | .execute_rw = rd_execute_rw, |
654 | }; | |
655 | ||
de103c93 CH |
656 | static sense_reason_t |
657 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 658 | { |
9e999a6c | 659 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
660 | } |
661 | ||
0a06d430 | 662 | static const struct target_backend_ops rd_mcp_ops = { |
c66ac9db | 663 | .name = "rd_mcp", |
0fd97ccf CH |
664 | .inquiry_prod = "RAMDISK-MCP", |
665 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
666 | .attach_hba = rd_attach_hba, |
667 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
668 | .alloc_device = rd_alloc_device, |
669 | .configure_device = rd_configure_device, | |
c66ac9db | 670 | .free_device = rd_free_device, |
0c2ad7d1 | 671 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
672 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
673 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 674 | .get_device_type = sbc_get_device_type, |
c66ac9db | 675 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
676 | .init_prot = rd_init_prot, |
677 | .free_prot = rd_free_prot, | |
5873c4d1 | 678 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
679 | }; |
680 | ||
681 | int __init rd_module_init(void) | |
682 | { | |
0a06d430 | 683 | return transport_backend_register(&rd_mcp_ops); |
c66ac9db NB |
684 | } |
685 | ||
686 | void rd_module_exit(void) | |
687 | { | |
0a06d430 | 688 | target_backend_unregister(&rd_mcp_ops); |
c66ac9db | 689 | } |