]>
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 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
46 | { | |
47 | struct rd_host *rd_host; | |
48 | ||
49 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
50 | if (!rd_host) { |
51 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
52 | return -ENOMEM; |
53 | } | |
54 | ||
55 | rd_host->rd_host_id = host_id; | |
56 | ||
5951146d | 57 | hba->hba_ptr = rd_host; |
c66ac9db | 58 | |
6708bb27 | 59 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
60 | " Generic Target Core Stack %s\n", hba->hba_id, |
61 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
62 | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static void rd_detach_hba(struct se_hba *hba) | |
67 | { | |
68 | struct rd_host *rd_host = hba->hba_ptr; | |
69 | ||
6708bb27 | 70 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
71 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
72 | ||
73 | kfree(rd_host); | |
74 | hba->hba_ptr = NULL; | |
75 | } | |
76 | ||
4442dc8a NB |
77 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
78 | u32 sg_table_count) | |
c66ac9db | 79 | { |
c66ac9db NB |
80 | struct page *pg; |
81 | struct scatterlist *sg; | |
4442dc8a | 82 | u32 i, j, page_count = 0, sg_per_table; |
c66ac9db | 83 | |
4442dc8a | 84 | for (i = 0; i < sg_table_count; i++) { |
c66ac9db NB |
85 | sg = sg_table[i].sg_table; |
86 | sg_per_table = sg_table[i].rd_sg_count; | |
87 | ||
88 | for (j = 0; j < sg_per_table; j++) { | |
89 | pg = sg_page(&sg[j]); | |
6708bb27 | 90 | if (pg) { |
c66ac9db NB |
91 | __free_page(pg); |
92 | page_count++; | |
93 | } | |
94 | } | |
c66ac9db NB |
95 | kfree(sg); |
96 | } | |
97 | ||
4442dc8a NB |
98 | kfree(sg_table); |
99 | return page_count; | |
100 | } | |
101 | ||
102 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
103 | { | |
104 | u32 page_count; | |
105 | ||
106 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
107 | return; | |
108 | ||
109 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, | |
110 | rd_dev->sg_table_count); | |
111 | ||
6708bb27 | 112 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
113 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
114 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
115 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
116 | ||
c66ac9db NB |
117 | rd_dev->sg_table_array = NULL; |
118 | rd_dev->sg_table_count = 0; | |
119 | } | |
120 | ||
121 | ||
122 | /* rd_build_device_space(): | |
123 | * | |
124 | * | |
125 | */ | |
4442dc8a NB |
126 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
127 | u32 total_sg_needed, unsigned char init_payload) | |
c66ac9db | 128 | { |
4442dc8a | 129 | u32 i = 0, j, page_offset = 0, sg_per_table; |
c66ac9db NB |
130 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
131 | sizeof(struct scatterlist)); | |
c66ac9db NB |
132 | struct page *pg; |
133 | struct scatterlist *sg; | |
4442dc8a | 134 | unsigned char *p; |
c66ac9db NB |
135 | |
136 | while (total_sg_needed) { | |
bfd9a53e AM |
137 | unsigned int chain_entry = 0; |
138 | ||
c66ac9db NB |
139 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
140 | max_sg_per_table : total_sg_needed; | |
141 | ||
bfd9a53e AM |
142 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN |
143 | ||
144 | /* | |
145 | * Reserve extra element for chain entry | |
146 | */ | |
147 | if (sg_per_table < total_sg_needed) | |
148 | chain_entry = 1; | |
149 | ||
150 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
151 | ||
152 | sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), | |
c66ac9db | 153 | GFP_KERNEL); |
6708bb27 AG |
154 | if (!sg) { |
155 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 156 | " for struct rd_dev\n"); |
065f9716 | 157 | return -ENOMEM; |
c66ac9db NB |
158 | } |
159 | ||
bfd9a53e AM |
160 | sg_init_table(sg, sg_per_table + chain_entry); |
161 | ||
162 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN | |
163 | ||
164 | if (i > 0) { | |
165 | sg_chain(sg_table[i - 1].sg_table, | |
166 | max_sg_per_table + 1, sg); | |
167 | } | |
168 | ||
169 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
c66ac9db NB |
170 | |
171 | sg_table[i].sg_table = sg; | |
172 | sg_table[i].rd_sg_count = sg_per_table; | |
173 | sg_table[i].page_start_offset = page_offset; | |
174 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
175 | - 1; | |
176 | ||
177 | for (j = 0; j < sg_per_table; j++) { | |
178 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
179 | if (!pg) { |
180 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 181 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 182 | return -ENOMEM; |
c66ac9db NB |
183 | } |
184 | sg_assign_page(&sg[j], pg); | |
185 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
186 | |
187 | p = kmap(pg); | |
188 | memset(p, init_payload, PAGE_SIZE); | |
189 | kunmap(pg); | |
c66ac9db NB |
190 | } |
191 | ||
192 | page_offset += sg_per_table; | |
193 | total_sg_needed -= sg_per_table; | |
194 | } | |
195 | ||
4442dc8a NB |
196 | return 0; |
197 | } | |
198 | ||
199 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
200 | { | |
201 | struct rd_dev_sg_table *sg_table; | |
202 | u32 sg_tables, total_sg_needed; | |
203 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
204 | sizeof(struct scatterlist)); | |
205 | int rc; | |
206 | ||
207 | if (rd_dev->rd_page_count <= 0) { | |
208 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
209 | rd_dev->rd_page_count); | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | /* Don't need backing pages for NULLIO */ | |
214 | if (rd_dev->rd_flags & RDF_NULLIO) | |
215 | return 0; | |
216 | ||
217 | total_sg_needed = rd_dev->rd_page_count; | |
218 | ||
219 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
220 | ||
221 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
222 | if (!sg_table) { | |
223 | pr_err("Unable to allocate memory for Ramdisk" | |
224 | " scatterlist tables\n"); | |
225 | return -ENOMEM; | |
226 | } | |
227 | ||
228 | rd_dev->sg_table_array = sg_table; | |
229 | rd_dev->sg_table_count = sg_tables; | |
230 | ||
231 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
232 | if (rc) | |
233 | return rc; | |
234 | ||
6708bb27 | 235 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
236 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
237 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
238 | rd_dev->sg_table_count); | |
c66ac9db NB |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
d7e8eb5d NB |
243 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
244 | { | |
245 | u32 page_count; | |
246 | ||
247 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
248 | return; | |
249 | ||
250 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
251 | rd_dev->sg_prot_count); | |
252 | ||
253 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
254 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
255 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
256 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
257 | ||
258 | rd_dev->sg_prot_array = NULL; | |
259 | rd_dev->sg_prot_count = 0; | |
260 | } | |
261 | ||
9d2e59f2 | 262 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
263 | { |
264 | struct rd_dev_sg_table *sg_table; | |
265 | u32 total_sg_needed, sg_tables; | |
266 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
267 | sizeof(struct scatterlist)); | |
268 | int rc; | |
269 | ||
270 | if (rd_dev->rd_flags & RDF_NULLIO) | |
271 | return 0; | |
9d2e59f2 QT |
272 | /* |
273 | * prot_length=8byte dif data | |
274 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
275 | * (prot_length/block_size) + pad | |
276 | * PGSZ canceled each other. | |
277 | */ | |
278 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
279 | |
280 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
281 | ||
282 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
283 | if (!sg_table) { | |
284 | pr_err("Unable to allocate memory for Ramdisk protection" | |
285 | " scatterlist tables\n"); | |
286 | return -ENOMEM; | |
287 | } | |
288 | ||
289 | rd_dev->sg_prot_array = sg_table; | |
290 | rd_dev->sg_prot_count = sg_tables; | |
291 | ||
292 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
293 | if (rc) | |
294 | return rc; | |
295 | ||
296 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
297 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
298 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
0fd97ccf | 303 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
304 | { |
305 | struct rd_dev *rd_dev; | |
306 | struct rd_host *rd_host = hba->hba_ptr; | |
307 | ||
308 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
309 | if (!rd_dev) { |
310 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
311 | return NULL; |
312 | } | |
313 | ||
314 | rd_dev->rd_host = rd_host; | |
c66ac9db | 315 | |
0fd97ccf | 316 | return &rd_dev->dev; |
c66ac9db NB |
317 | } |
318 | ||
0fd97ccf | 319 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 320 | { |
0fd97ccf CH |
321 | struct rd_dev *rd_dev = RD_DEV(dev); |
322 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
323 | int ret; | |
c66ac9db | 324 | |
0fd97ccf CH |
325 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
326 | pr_debug("Missing rd_pages= parameter\n"); | |
327 | return -EINVAL; | |
328 | } | |
c66ac9db | 329 | |
065f9716 DC |
330 | ret = rd_build_device_space(rd_dev); |
331 | if (ret < 0) | |
c66ac9db NB |
332 | goto fail; |
333 | ||
0fd97ccf CH |
334 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
335 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
336 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
337 | |
338 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 339 | |
8feb58d0 | 340 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 341 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 342 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
343 | rd_dev->sg_table_count, |
344 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
345 | ||
0fd97ccf | 346 | return 0; |
c66ac9db NB |
347 | |
348 | fail: | |
349 | rd_release_device_space(rd_dev); | |
0fd97ccf | 350 | return ret; |
c66ac9db NB |
351 | } |
352 | ||
4cc987ea NB |
353 | static void rd_dev_call_rcu(struct rcu_head *p) |
354 | { | |
355 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
356 | struct rd_dev *rd_dev = RD_DEV(dev); | |
357 | ||
358 | kfree(rd_dev); | |
359 | } | |
360 | ||
0fd97ccf | 361 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 362 | { |
0fd97ccf | 363 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
364 | |
365 | rd_release_device_space(rd_dev); | |
4cc987ea | 366 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); |
c66ac9db NB |
367 | } |
368 | ||
c66ac9db NB |
369 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
370 | { | |
c66ac9db | 371 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
372 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
373 | sizeof(struct scatterlist)); | |
c66ac9db | 374 | |
8f67835f MS |
375 | i = page / sg_per_table; |
376 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
377 | sg_table = &rd_dev->sg_table_array[i]; |
378 | if ((sg_table->page_start_offset <= page) && | |
379 | (sg_table->page_end_offset >= page)) | |
380 | return sg_table; | |
381 | } | |
382 | ||
6708bb27 | 383 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
384 | page); |
385 | ||
386 | return NULL; | |
387 | } | |
388 | ||
6e611119 NB |
389 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
390 | { | |
391 | struct rd_dev_sg_table *sg_table; | |
392 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
393 | sizeof(struct scatterlist)); | |
394 | ||
395 | i = page / sg_per_table; | |
396 | if (i < rd_dev->sg_prot_count) { | |
397 | sg_table = &rd_dev->sg_prot_array[i]; | |
398 | if ((sg_table->page_start_offset <= page) && | |
399 | (sg_table->page_end_offset >= page)) | |
400 | return sg_table; | |
401 | } | |
402 | ||
403 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
404 | page); | |
405 | ||
406 | return NULL; | |
407 | } | |
408 | ||
f75b6fae | 409 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
6766cc81 AM |
410 | { |
411 | struct se_device *se_dev = cmd->se_dev; | |
412 | struct rd_dev *dev = RD_DEV(se_dev); | |
413 | struct rd_dev_sg_table *prot_table; | |
bfd9a53e | 414 | bool need_to_release = false; |
6766cc81 AM |
415 | struct scatterlist *prot_sg; |
416 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
417 | u32 prot_offset, prot_page; | |
bfd9a53e | 418 | u32 prot_npages __maybe_unused; |
6766cc81 | 419 | u64 tmp; |
bfd9a53e | 420 | sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
6766cc81 AM |
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 - | |
431 | prot_table->page_start_offset]; | |
432 | ||
bfd9a53e AM |
433 | #ifndef CONFIG_ARCH_HAS_SG_CHAIN |
434 | ||
435 | prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length, | |
436 | PAGE_SIZE); | |
437 | ||
438 | /* | |
439 | * Allocate temporaly contiguous scatterlist entries if prot pages | |
440 | * straddles multiple scatterlist tables. | |
441 | */ | |
442 | if (prot_table->page_end_offset < prot_page + prot_npages - 1) { | |
443 | int i; | |
444 | ||
445 | prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL); | |
446 | if (!prot_sg) | |
447 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
448 | ||
449 | need_to_release = true; | |
450 | sg_init_table(prot_sg, prot_npages); | |
451 | ||
452 | for (i = 0; i < prot_npages; i++) { | |
453 | if (prot_page + i > prot_table->page_end_offset) { | |
454 | prot_table = rd_get_prot_table(dev, | |
455 | prot_page + i); | |
456 | if (!prot_table) { | |
457 | kfree(prot_sg); | |
458 | return rc; | |
459 | } | |
460 | sg_unmark_end(&prot_sg[i - 1]); | |
461 | } | |
462 | prot_sg[i] = prot_table->sg_table[prot_page + i - | |
463 | prot_table->page_start_offset]; | |
464 | } | |
465 | } | |
466 | ||
467 | #endif /* !CONFIG_ARCH_HAS_SG_CHAIN */ | |
468 | ||
f75b6fae SG |
469 | if (is_read) |
470 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
471 | prot_sg, prot_offset); | |
472 | else | |
473 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
474 | cmd->t_prot_sg, 0); | |
475 | ||
476 | if (!rc) | |
477 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); | |
478 | ||
bfd9a53e AM |
479 | if (need_to_release) |
480 | kfree(prot_sg); | |
6766cc81 AM |
481 | |
482 | return rc; | |
483 | } | |
484 | ||
de103c93 | 485 | static sense_reason_t |
a82a9538 NB |
486 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
487 | enum dma_data_direction data_direction) | |
c66ac9db | 488 | { |
5787cacd | 489 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 490 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 491 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
492 | struct scatterlist *rd_sg; |
493 | struct sg_mapping_iter m; | |
8feb58d0 CH |
494 | u32 rd_offset; |
495 | u32 rd_size; | |
496 | u32 rd_page; | |
65b0c78d | 497 | u32 src_len; |
8feb58d0 | 498 | u64 tmp; |
6e611119 | 499 | sense_reason_t rc; |
c66ac9db | 500 | |
52c07423 NB |
501 | if (dev->rd_flags & RDF_NULLIO) { |
502 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
503 | return 0; | |
504 | } | |
505 | ||
0fd97ccf | 506 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
507 | rd_offset = do_div(tmp, PAGE_SIZE); |
508 | rd_page = tmp; | |
5787cacd | 509 | rd_size = cmd->data_length; |
8feb58d0 CH |
510 | |
511 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 512 | if (!table) |
de103c93 | 513 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 514 | |
8feb58d0 | 515 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 516 | |
65b0c78d | 517 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 518 | dev->rd_dev_id, |
5787cacd CH |
519 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
520 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 521 | |
1762742f NB |
522 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
523 | data_direction == DMA_TO_DEVICE) { | |
f75b6fae | 524 | rc = rd_do_prot_rw(cmd, false); |
6e611119 NB |
525 | if (rc) |
526 | return rc; | |
527 | } | |
528 | ||
65b0c78d | 529 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
530 | sg_miter_start(&m, sgl, sgl_nents, |
531 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
532 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
533 | while (rd_size) { | |
65b0c78d SAS |
534 | u32 len; |
535 | void *rd_addr; | |
c66ac9db | 536 | |
65b0c78d | 537 | sg_miter_next(&m); |
bbf344e5 HR |
538 | if (!(u32)m.length) { |
539 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
540 | dev->rd_dev_id, m.addr, m.length); | |
541 | sg_miter_stop(&m); | |
542 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
543 | } | |
65b0c78d | 544 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
545 | if (len > rd_size) { |
546 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
547 | "size %d\n", dev->rd_dev_id, | |
548 | rd_page, rd_offset, rd_size); | |
549 | len = rd_size; | |
550 | } | |
65b0c78d | 551 | m.consumed = len; |
c66ac9db | 552 | |
65b0c78d | 553 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 554 | |
5787cacd | 555 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
556 | memcpy(m.addr, rd_addr, len); |
557 | else | |
558 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 559 | |
8feb58d0 CH |
560 | rd_size -= len; |
561 | if (!rd_size) | |
c66ac9db NB |
562 | continue; |
563 | ||
65b0c78d SAS |
564 | src_len -= len; |
565 | if (src_len) { | |
566 | rd_offset += len; | |
c66ac9db NB |
567 | continue; |
568 | } | |
6708bb27 | 569 | |
65b0c78d | 570 | /* rd page completed, next one please */ |
8feb58d0 | 571 | rd_page++; |
65b0c78d SAS |
572 | rd_offset = 0; |
573 | src_len = PAGE_SIZE; | |
8feb58d0 | 574 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 575 | rd_sg++; |
c66ac9db NB |
576 | continue; |
577 | } | |
6708bb27 | 578 | |
8feb58d0 | 579 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
580 | if (!table) { |
581 | sg_miter_stop(&m); | |
de103c93 | 582 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 583 | } |
c66ac9db | 584 | |
65b0c78d SAS |
585 | /* since we increment, the first sg entry is correct */ |
586 | rd_sg = table->sg_table; | |
c66ac9db | 587 | } |
65b0c78d | 588 | sg_miter_stop(&m); |
c66ac9db | 589 | |
1762742f NB |
590 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
591 | data_direction == DMA_FROM_DEVICE) { | |
f75b6fae | 592 | rc = rd_do_prot_rw(cmd, true); |
6e611119 NB |
593 | if (rc) |
594 | return rc; | |
595 | } | |
596 | ||
5787cacd | 597 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 598 | return 0; |
c66ac9db NB |
599 | } |
600 | ||
c66ac9db | 601 | enum { |
52c07423 | 602 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
603 | }; |
604 | ||
605 | static match_table_t tokens = { | |
606 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 607 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
608 | {Opt_err, NULL} |
609 | }; | |
610 | ||
0fd97ccf CH |
611 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
612 | const char *page, ssize_t count) | |
c66ac9db | 613 | { |
0fd97ccf | 614 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
615 | char *orig, *ptr, *opts; |
616 | substring_t args[MAX_OPT_ARGS]; | |
617 | int ret = 0, arg, token; | |
618 | ||
619 | opts = kstrdup(page, GFP_KERNEL); | |
620 | if (!opts) | |
621 | return -ENOMEM; | |
622 | ||
623 | orig = opts; | |
624 | ||
90c161b6 | 625 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
626 | if (!*ptr) |
627 | continue; | |
628 | ||
629 | token = match_token(ptr, tokens, args); | |
630 | switch (token) { | |
631 | case Opt_rd_pages: | |
632 | match_int(args, &arg); | |
633 | rd_dev->rd_page_count = arg; | |
6708bb27 | 634 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
635 | " Count: %u\n", rd_dev->rd_page_count); |
636 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
637 | break; | |
52c07423 NB |
638 | case Opt_rd_nullio: |
639 | match_int(args, &arg); | |
640 | if (arg != 1) | |
641 | break; | |
642 | ||
643 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
644 | rd_dev->rd_flags |= RDF_NULLIO; | |
645 | break; | |
c66ac9db NB |
646 | default: |
647 | break; | |
648 | } | |
649 | } | |
650 | ||
651 | kfree(orig); | |
652 | return (!ret) ? count : ret; | |
653 | } | |
654 | ||
0fd97ccf | 655 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 656 | { |
0fd97ccf | 657 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 658 | |
8feb58d0 CH |
659 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
660 | rd_dev->rd_dev_id); | |
c66ac9db | 661 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
662 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
663 | PAGE_SIZE, rd_dev->sg_table_count, | |
664 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
665 | return bl; |
666 | } | |
667 | ||
c66ac9db NB |
668 | static sector_t rd_get_blocks(struct se_device *dev) |
669 | { | |
0fd97ccf CH |
670 | struct rd_dev *rd_dev = RD_DEV(dev); |
671 | ||
c66ac9db | 672 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 673 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
674 | |
675 | return blocks_long; | |
676 | } | |
677 | ||
d7e8eb5d NB |
678 | static int rd_init_prot(struct se_device *dev) |
679 | { | |
680 | struct rd_dev *rd_dev = RD_DEV(dev); | |
681 | ||
682 | if (!dev->dev_attrib.pi_prot_type) | |
683 | return 0; | |
684 | ||
9d2e59f2 QT |
685 | return rd_build_prot_space(rd_dev, dev->prot_length, |
686 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
687 | } |
688 | ||
689 | static void rd_free_prot(struct se_device *dev) | |
690 | { | |
691 | struct rd_dev *rd_dev = RD_DEV(dev); | |
692 | ||
693 | rd_release_prot_space(rd_dev); | |
694 | } | |
695 | ||
9e999a6c | 696 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
697 | .execute_rw = rd_execute_rw, |
698 | }; | |
699 | ||
de103c93 CH |
700 | static sense_reason_t |
701 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 702 | { |
9e999a6c | 703 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
704 | } |
705 | ||
0a06d430 | 706 | static const struct target_backend_ops rd_mcp_ops = { |
c66ac9db | 707 | .name = "rd_mcp", |
0fd97ccf CH |
708 | .inquiry_prod = "RAMDISK-MCP", |
709 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
710 | .attach_hba = rd_attach_hba, |
711 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
712 | .alloc_device = rd_alloc_device, |
713 | .configure_device = rd_configure_device, | |
c66ac9db | 714 | .free_device = rd_free_device, |
0c2ad7d1 | 715 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
716 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
717 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 718 | .get_device_type = sbc_get_device_type, |
c66ac9db | 719 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
720 | .init_prot = rd_init_prot, |
721 | .free_prot = rd_free_prot, | |
5873c4d1 | 722 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
723 | }; |
724 | ||
725 | int __init rd_module_init(void) | |
726 | { | |
0a06d430 | 727 | return transport_backend_register(&rd_mcp_ops); |
c66ac9db NB |
728 | } |
729 | ||
730 | void rd_module_exit(void) | |
731 | { | |
0a06d430 | 732 | target_backend_unregister(&rd_mcp_ops); |
c66ac9db | 733 | } |