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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_rd.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Ramdisk transport | |
5 | * specific functions. | |
6 | * | |
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 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN |
142 | ||
143 | /* | |
144 | * Reserve extra element for chain entry | |
145 | */ | |
146 | if (sg_per_table < total_sg_needed) | |
147 | chain_entry = 1; | |
148 | ||
149 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
150 | ||
151 | sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), | |
c66ac9db | 152 | GFP_KERNEL); |
6708bb27 AG |
153 | if (!sg) { |
154 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 155 | " for struct rd_dev\n"); |
065f9716 | 156 | return -ENOMEM; |
c66ac9db NB |
157 | } |
158 | ||
bfd9a53e AM |
159 | sg_init_table(sg, sg_per_table + chain_entry); |
160 | ||
161 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN | |
162 | ||
163 | if (i > 0) { | |
164 | sg_chain(sg_table[i - 1].sg_table, | |
165 | max_sg_per_table + 1, sg); | |
166 | } | |
167 | ||
168 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
c66ac9db NB |
169 | |
170 | sg_table[i].sg_table = sg; | |
171 | sg_table[i].rd_sg_count = sg_per_table; | |
172 | sg_table[i].page_start_offset = page_offset; | |
173 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
174 | - 1; | |
175 | ||
176 | for (j = 0; j < sg_per_table; j++) { | |
177 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
178 | if (!pg) { |
179 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 180 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 181 | return -ENOMEM; |
c66ac9db NB |
182 | } |
183 | sg_assign_page(&sg[j], pg); | |
184 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
185 | |
186 | p = kmap(pg); | |
187 | memset(p, init_payload, PAGE_SIZE); | |
188 | kunmap(pg); | |
c66ac9db NB |
189 | } |
190 | ||
191 | page_offset += sg_per_table; | |
192 | total_sg_needed -= sg_per_table; | |
193 | } | |
194 | ||
4442dc8a NB |
195 | return 0; |
196 | } | |
197 | ||
198 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
199 | { | |
200 | struct rd_dev_sg_table *sg_table; | |
201 | u32 sg_tables, total_sg_needed; | |
202 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
203 | sizeof(struct scatterlist)); | |
204 | int rc; | |
205 | ||
206 | if (rd_dev->rd_page_count <= 0) { | |
207 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
208 | rd_dev->rd_page_count); | |
209 | return -EINVAL; | |
210 | } | |
211 | ||
212 | /* Don't need backing pages for NULLIO */ | |
213 | if (rd_dev->rd_flags & RDF_NULLIO) | |
214 | return 0; | |
215 | ||
216 | total_sg_needed = rd_dev->rd_page_count; | |
217 | ||
218 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
219 | ||
220 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
221 | if (!sg_table) { | |
222 | pr_err("Unable to allocate memory for Ramdisk" | |
223 | " scatterlist tables\n"); | |
224 | return -ENOMEM; | |
225 | } | |
226 | ||
227 | rd_dev->sg_table_array = sg_table; | |
228 | rd_dev->sg_table_count = sg_tables; | |
229 | ||
230 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
231 | if (rc) | |
232 | return rc; | |
233 | ||
6708bb27 | 234 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
235 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
236 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
237 | rd_dev->sg_table_count); | |
c66ac9db NB |
238 | |
239 | return 0; | |
240 | } | |
241 | ||
d7e8eb5d NB |
242 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
243 | { | |
244 | u32 page_count; | |
245 | ||
246 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
247 | return; | |
248 | ||
249 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
250 | rd_dev->sg_prot_count); | |
251 | ||
252 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
253 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
254 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
255 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
256 | ||
257 | rd_dev->sg_prot_array = NULL; | |
258 | rd_dev->sg_prot_count = 0; | |
259 | } | |
260 | ||
9d2e59f2 | 261 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
262 | { |
263 | struct rd_dev_sg_table *sg_table; | |
264 | u32 total_sg_needed, sg_tables; | |
265 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
266 | sizeof(struct scatterlist)); | |
267 | int rc; | |
268 | ||
269 | if (rd_dev->rd_flags & RDF_NULLIO) | |
270 | return 0; | |
9d2e59f2 QT |
271 | /* |
272 | * prot_length=8byte dif data | |
273 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
274 | * (prot_length/block_size) + pad | |
275 | * PGSZ canceled each other. | |
276 | */ | |
277 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
278 | |
279 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
280 | ||
281 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
282 | if (!sg_table) { | |
283 | pr_err("Unable to allocate memory for Ramdisk protection" | |
284 | " scatterlist tables\n"); | |
285 | return -ENOMEM; | |
286 | } | |
287 | ||
288 | rd_dev->sg_prot_array = sg_table; | |
289 | rd_dev->sg_prot_count = sg_tables; | |
290 | ||
291 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
292 | if (rc) | |
293 | return rc; | |
294 | ||
295 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
296 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
297 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
0fd97ccf | 302 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
303 | { |
304 | struct rd_dev *rd_dev; | |
305 | struct rd_host *rd_host = hba->hba_ptr; | |
306 | ||
307 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
308 | if (!rd_dev) { |
309 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
310 | return NULL; |
311 | } | |
312 | ||
313 | rd_dev->rd_host = rd_host; | |
c66ac9db | 314 | |
0fd97ccf | 315 | return &rd_dev->dev; |
c66ac9db NB |
316 | } |
317 | ||
0fd97ccf | 318 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 319 | { |
0fd97ccf CH |
320 | struct rd_dev *rd_dev = RD_DEV(dev); |
321 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
322 | int ret; | |
c66ac9db | 323 | |
0fd97ccf CH |
324 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
325 | pr_debug("Missing rd_pages= parameter\n"); | |
326 | return -EINVAL; | |
327 | } | |
c66ac9db | 328 | |
065f9716 DC |
329 | ret = rd_build_device_space(rd_dev); |
330 | if (ret < 0) | |
c66ac9db NB |
331 | goto fail; |
332 | ||
0fd97ccf CH |
333 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
334 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
335 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
336 | |
337 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 338 | |
8feb58d0 | 339 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 340 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 341 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
342 | rd_dev->sg_table_count, |
343 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
344 | ||
0fd97ccf | 345 | return 0; |
c66ac9db NB |
346 | |
347 | fail: | |
348 | rd_release_device_space(rd_dev); | |
0fd97ccf | 349 | return ret; |
c66ac9db NB |
350 | } |
351 | ||
4cc987ea NB |
352 | static void rd_dev_call_rcu(struct rcu_head *p) |
353 | { | |
354 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
355 | struct rd_dev *rd_dev = RD_DEV(dev); | |
356 | ||
357 | kfree(rd_dev); | |
358 | } | |
359 | ||
0fd97ccf | 360 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 361 | { |
0fd97ccf | 362 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
363 | |
364 | rd_release_device_space(rd_dev); | |
4cc987ea | 365 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); |
c66ac9db NB |
366 | } |
367 | ||
c66ac9db NB |
368 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
369 | { | |
c66ac9db | 370 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
371 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
372 | sizeof(struct scatterlist)); | |
c66ac9db | 373 | |
8f67835f MS |
374 | i = page / sg_per_table; |
375 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
376 | sg_table = &rd_dev->sg_table_array[i]; |
377 | if ((sg_table->page_start_offset <= page) && | |
378 | (sg_table->page_end_offset >= page)) | |
379 | return sg_table; | |
380 | } | |
381 | ||
6708bb27 | 382 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
383 | page); |
384 | ||
385 | return NULL; | |
386 | } | |
387 | ||
6e611119 NB |
388 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
389 | { | |
390 | struct rd_dev_sg_table *sg_table; | |
391 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
392 | sizeof(struct scatterlist)); | |
393 | ||
394 | i = page / sg_per_table; | |
395 | if (i < rd_dev->sg_prot_count) { | |
396 | sg_table = &rd_dev->sg_prot_array[i]; | |
397 | if ((sg_table->page_start_offset <= page) && | |
398 | (sg_table->page_end_offset >= page)) | |
399 | return sg_table; | |
400 | } | |
401 | ||
402 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
403 | page); | |
404 | ||
405 | return NULL; | |
406 | } | |
407 | ||
f75b6fae | 408 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
6766cc81 AM |
409 | { |
410 | struct se_device *se_dev = cmd->se_dev; | |
411 | struct rd_dev *dev = RD_DEV(se_dev); | |
412 | struct rd_dev_sg_table *prot_table; | |
bfd9a53e | 413 | bool need_to_release = false; |
6766cc81 AM |
414 | struct scatterlist *prot_sg; |
415 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
416 | u32 prot_offset, prot_page; | |
bfd9a53e | 417 | u32 prot_npages __maybe_unused; |
6766cc81 | 418 | u64 tmp; |
bfd9a53e | 419 | sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
6766cc81 AM |
420 | |
421 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
422 | prot_offset = do_div(tmp, PAGE_SIZE); | |
423 | prot_page = tmp; | |
424 | ||
425 | prot_table = rd_get_prot_table(dev, prot_page); | |
426 | if (!prot_table) | |
427 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
428 | ||
429 | prot_sg = &prot_table->sg_table[prot_page - | |
430 | prot_table->page_start_offset]; | |
431 | ||
bfd9a53e AM |
432 | #ifndef CONFIG_ARCH_HAS_SG_CHAIN |
433 | ||
434 | prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length, | |
435 | PAGE_SIZE); | |
436 | ||
437 | /* | |
438 | * Allocate temporaly contiguous scatterlist entries if prot pages | |
439 | * straddles multiple scatterlist tables. | |
440 | */ | |
441 | if (prot_table->page_end_offset < prot_page + prot_npages - 1) { | |
442 | int i; | |
443 | ||
444 | prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL); | |
445 | if (!prot_sg) | |
446 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
447 | ||
448 | need_to_release = true; | |
449 | sg_init_table(prot_sg, prot_npages); | |
450 | ||
451 | for (i = 0; i < prot_npages; i++) { | |
452 | if (prot_page + i > prot_table->page_end_offset) { | |
453 | prot_table = rd_get_prot_table(dev, | |
454 | prot_page + i); | |
455 | if (!prot_table) { | |
456 | kfree(prot_sg); | |
457 | return rc; | |
458 | } | |
459 | sg_unmark_end(&prot_sg[i - 1]); | |
460 | } | |
461 | prot_sg[i] = prot_table->sg_table[prot_page + i - | |
462 | prot_table->page_start_offset]; | |
463 | } | |
464 | } | |
465 | ||
466 | #endif /* !CONFIG_ARCH_HAS_SG_CHAIN */ | |
467 | ||
f75b6fae SG |
468 | if (is_read) |
469 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
470 | prot_sg, prot_offset); | |
471 | else | |
472 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
473 | cmd->t_prot_sg, 0); | |
474 | ||
475 | if (!rc) | |
476 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); | |
477 | ||
bfd9a53e AM |
478 | if (need_to_release) |
479 | kfree(prot_sg); | |
6766cc81 AM |
480 | |
481 | return rc; | |
482 | } | |
483 | ||
de103c93 | 484 | static sense_reason_t |
a82a9538 NB |
485 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
486 | enum dma_data_direction data_direction) | |
c66ac9db | 487 | { |
5787cacd | 488 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 489 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 490 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
491 | struct scatterlist *rd_sg; |
492 | struct sg_mapping_iter m; | |
8feb58d0 CH |
493 | u32 rd_offset; |
494 | u32 rd_size; | |
495 | u32 rd_page; | |
65b0c78d | 496 | u32 src_len; |
8feb58d0 | 497 | u64 tmp; |
6e611119 | 498 | sense_reason_t rc; |
c66ac9db | 499 | |
52c07423 NB |
500 | if (dev->rd_flags & RDF_NULLIO) { |
501 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
502 | return 0; | |
503 | } | |
504 | ||
0fd97ccf | 505 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
506 | rd_offset = do_div(tmp, PAGE_SIZE); |
507 | rd_page = tmp; | |
5787cacd | 508 | rd_size = cmd->data_length; |
8feb58d0 CH |
509 | |
510 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 511 | if (!table) |
de103c93 | 512 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 513 | |
8feb58d0 | 514 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 515 | |
65b0c78d | 516 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 517 | dev->rd_dev_id, |
5787cacd CH |
518 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
519 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 520 | |
1762742f NB |
521 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
522 | data_direction == DMA_TO_DEVICE) { | |
f75b6fae | 523 | rc = rd_do_prot_rw(cmd, false); |
6e611119 NB |
524 | if (rc) |
525 | return rc; | |
526 | } | |
527 | ||
65b0c78d | 528 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
529 | sg_miter_start(&m, sgl, sgl_nents, |
530 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
531 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
532 | while (rd_size) { | |
65b0c78d SAS |
533 | u32 len; |
534 | void *rd_addr; | |
c66ac9db | 535 | |
65b0c78d | 536 | sg_miter_next(&m); |
bbf344e5 HR |
537 | if (!(u32)m.length) { |
538 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
539 | dev->rd_dev_id, m.addr, m.length); | |
540 | sg_miter_stop(&m); | |
541 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
542 | } | |
65b0c78d | 543 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
544 | if (len > rd_size) { |
545 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
546 | "size %d\n", dev->rd_dev_id, | |
547 | rd_page, rd_offset, rd_size); | |
548 | len = rd_size; | |
549 | } | |
65b0c78d | 550 | m.consumed = len; |
c66ac9db | 551 | |
65b0c78d | 552 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 553 | |
5787cacd | 554 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
555 | memcpy(m.addr, rd_addr, len); |
556 | else | |
557 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 558 | |
8feb58d0 CH |
559 | rd_size -= len; |
560 | if (!rd_size) | |
c66ac9db NB |
561 | continue; |
562 | ||
65b0c78d SAS |
563 | src_len -= len; |
564 | if (src_len) { | |
565 | rd_offset += len; | |
c66ac9db NB |
566 | continue; |
567 | } | |
6708bb27 | 568 | |
65b0c78d | 569 | /* rd page completed, next one please */ |
8feb58d0 | 570 | rd_page++; |
65b0c78d SAS |
571 | rd_offset = 0; |
572 | src_len = PAGE_SIZE; | |
8feb58d0 | 573 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 574 | rd_sg++; |
c66ac9db NB |
575 | continue; |
576 | } | |
6708bb27 | 577 | |
8feb58d0 | 578 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
579 | if (!table) { |
580 | sg_miter_stop(&m); | |
de103c93 | 581 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 582 | } |
c66ac9db | 583 | |
65b0c78d SAS |
584 | /* since we increment, the first sg entry is correct */ |
585 | rd_sg = table->sg_table; | |
c66ac9db | 586 | } |
65b0c78d | 587 | sg_miter_stop(&m); |
c66ac9db | 588 | |
1762742f NB |
589 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
590 | data_direction == DMA_FROM_DEVICE) { | |
f75b6fae | 591 | rc = rd_do_prot_rw(cmd, true); |
6e611119 NB |
592 | if (rc) |
593 | return rc; | |
594 | } | |
595 | ||
5787cacd | 596 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 597 | return 0; |
c66ac9db NB |
598 | } |
599 | ||
c66ac9db | 600 | enum { |
52c07423 | 601 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
602 | }; |
603 | ||
604 | static match_table_t tokens = { | |
605 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 606 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
607 | {Opt_err, NULL} |
608 | }; | |
609 | ||
0fd97ccf CH |
610 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
611 | const char *page, ssize_t count) | |
c66ac9db | 612 | { |
0fd97ccf | 613 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
614 | char *orig, *ptr, *opts; |
615 | substring_t args[MAX_OPT_ARGS]; | |
616 | int ret = 0, arg, token; | |
617 | ||
618 | opts = kstrdup(page, GFP_KERNEL); | |
619 | if (!opts) | |
620 | return -ENOMEM; | |
621 | ||
622 | orig = opts; | |
623 | ||
90c161b6 | 624 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
625 | if (!*ptr) |
626 | continue; | |
627 | ||
628 | token = match_token(ptr, tokens, args); | |
629 | switch (token) { | |
630 | case Opt_rd_pages: | |
631 | match_int(args, &arg); | |
632 | rd_dev->rd_page_count = arg; | |
6708bb27 | 633 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
634 | " Count: %u\n", rd_dev->rd_page_count); |
635 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
636 | break; | |
52c07423 NB |
637 | case Opt_rd_nullio: |
638 | match_int(args, &arg); | |
639 | if (arg != 1) | |
640 | break; | |
641 | ||
642 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
643 | rd_dev->rd_flags |= RDF_NULLIO; | |
644 | break; | |
c66ac9db NB |
645 | default: |
646 | break; | |
647 | } | |
648 | } | |
649 | ||
650 | kfree(orig); | |
651 | return (!ret) ? count : ret; | |
652 | } | |
653 | ||
0fd97ccf | 654 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 655 | { |
0fd97ccf | 656 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 657 | |
8feb58d0 CH |
658 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
659 | rd_dev->rd_dev_id); | |
c66ac9db | 660 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
661 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
662 | PAGE_SIZE, rd_dev->sg_table_count, | |
663 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
664 | return bl; |
665 | } | |
666 | ||
c66ac9db NB |
667 | static sector_t rd_get_blocks(struct se_device *dev) |
668 | { | |
0fd97ccf CH |
669 | struct rd_dev *rd_dev = RD_DEV(dev); |
670 | ||
c66ac9db | 671 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 672 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
673 | |
674 | return blocks_long; | |
675 | } | |
676 | ||
d7e8eb5d NB |
677 | static int rd_init_prot(struct se_device *dev) |
678 | { | |
679 | struct rd_dev *rd_dev = RD_DEV(dev); | |
680 | ||
681 | if (!dev->dev_attrib.pi_prot_type) | |
682 | return 0; | |
683 | ||
9d2e59f2 QT |
684 | return rd_build_prot_space(rd_dev, dev->prot_length, |
685 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
686 | } |
687 | ||
688 | static void rd_free_prot(struct se_device *dev) | |
689 | { | |
690 | struct rd_dev *rd_dev = RD_DEV(dev); | |
691 | ||
692 | rd_release_prot_space(rd_dev); | |
693 | } | |
694 | ||
9e999a6c | 695 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
696 | .execute_rw = rd_execute_rw, |
697 | }; | |
698 | ||
de103c93 CH |
699 | static sense_reason_t |
700 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 701 | { |
9e999a6c | 702 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
703 | } |
704 | ||
0a06d430 | 705 | static const struct target_backend_ops rd_mcp_ops = { |
c66ac9db | 706 | .name = "rd_mcp", |
0fd97ccf CH |
707 | .inquiry_prod = "RAMDISK-MCP", |
708 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
709 | .attach_hba = rd_attach_hba, |
710 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
711 | .alloc_device = rd_alloc_device, |
712 | .configure_device = rd_configure_device, | |
c66ac9db | 713 | .free_device = rd_free_device, |
0c2ad7d1 | 714 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
715 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
716 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 717 | .get_device_type = sbc_get_device_type, |
c66ac9db | 718 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
719 | .init_prot = rd_init_prot, |
720 | .free_prot = rd_free_prot, | |
5873c4d1 | 721 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
722 | }; |
723 | ||
724 | int __init rd_module_init(void) | |
725 | { | |
0a06d430 | 726 | return transport_backend_register(&rd_mcp_ops); |
c66ac9db NB |
727 | } |
728 | ||
729 | void rd_module_exit(void) | |
730 | { | |
0a06d430 | 731 | target_backend_unregister(&rd_mcp_ops); |
c66ac9db | 732 | } |