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> | |
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) { | |
bfd9a53e AM |
142 | unsigned int chain_entry = 0; |
143 | ||
c66ac9db NB |
144 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
145 | max_sg_per_table : total_sg_needed; | |
146 | ||
bfd9a53e AM |
147 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN |
148 | ||
149 | /* | |
150 | * Reserve extra element for chain entry | |
151 | */ | |
152 | if (sg_per_table < total_sg_needed) | |
153 | chain_entry = 1; | |
154 | ||
155 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
156 | ||
157 | sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), | |
c66ac9db | 158 | GFP_KERNEL); |
6708bb27 AG |
159 | if (!sg) { |
160 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 161 | " for struct rd_dev\n"); |
065f9716 | 162 | return -ENOMEM; |
c66ac9db NB |
163 | } |
164 | ||
bfd9a53e AM |
165 | sg_init_table(sg, sg_per_table + chain_entry); |
166 | ||
167 | #ifdef CONFIG_ARCH_HAS_SG_CHAIN | |
168 | ||
169 | if (i > 0) { | |
170 | sg_chain(sg_table[i - 1].sg_table, | |
171 | max_sg_per_table + 1, sg); | |
172 | } | |
173 | ||
174 | #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ | |
c66ac9db NB |
175 | |
176 | sg_table[i].sg_table = sg; | |
177 | sg_table[i].rd_sg_count = sg_per_table; | |
178 | sg_table[i].page_start_offset = page_offset; | |
179 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
180 | - 1; | |
181 | ||
182 | for (j = 0; j < sg_per_table; j++) { | |
183 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
184 | if (!pg) { |
185 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 186 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 187 | return -ENOMEM; |
c66ac9db NB |
188 | } |
189 | sg_assign_page(&sg[j], pg); | |
190 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
191 | |
192 | p = kmap(pg); | |
193 | memset(p, init_payload, PAGE_SIZE); | |
194 | kunmap(pg); | |
c66ac9db NB |
195 | } |
196 | ||
197 | page_offset += sg_per_table; | |
198 | total_sg_needed -= sg_per_table; | |
199 | } | |
200 | ||
4442dc8a NB |
201 | return 0; |
202 | } | |
203 | ||
204 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
205 | { | |
206 | struct rd_dev_sg_table *sg_table; | |
207 | u32 sg_tables, total_sg_needed; | |
208 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
209 | sizeof(struct scatterlist)); | |
210 | int rc; | |
211 | ||
212 | if (rd_dev->rd_page_count <= 0) { | |
213 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
214 | rd_dev->rd_page_count); | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | /* Don't need backing pages for NULLIO */ | |
219 | if (rd_dev->rd_flags & RDF_NULLIO) | |
220 | return 0; | |
221 | ||
222 | total_sg_needed = rd_dev->rd_page_count; | |
223 | ||
224 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
225 | ||
226 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
227 | if (!sg_table) { | |
228 | pr_err("Unable to allocate memory for Ramdisk" | |
229 | " scatterlist tables\n"); | |
230 | return -ENOMEM; | |
231 | } | |
232 | ||
233 | rd_dev->sg_table_array = sg_table; | |
234 | rd_dev->sg_table_count = sg_tables; | |
235 | ||
236 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
237 | if (rc) | |
238 | return rc; | |
239 | ||
6708bb27 | 240 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
241 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
242 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
243 | rd_dev->sg_table_count); | |
c66ac9db NB |
244 | |
245 | return 0; | |
246 | } | |
247 | ||
d7e8eb5d NB |
248 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
249 | { | |
250 | u32 page_count; | |
251 | ||
252 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
253 | return; | |
254 | ||
255 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
256 | rd_dev->sg_prot_count); | |
257 | ||
258 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
259 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
260 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
261 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
262 | ||
263 | rd_dev->sg_prot_array = NULL; | |
264 | rd_dev->sg_prot_count = 0; | |
265 | } | |
266 | ||
9d2e59f2 | 267 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
268 | { |
269 | struct rd_dev_sg_table *sg_table; | |
270 | u32 total_sg_needed, sg_tables; | |
271 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
272 | sizeof(struct scatterlist)); | |
273 | int rc; | |
274 | ||
275 | if (rd_dev->rd_flags & RDF_NULLIO) | |
276 | return 0; | |
9d2e59f2 QT |
277 | /* |
278 | * prot_length=8byte dif data | |
279 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
280 | * (prot_length/block_size) + pad | |
281 | * PGSZ canceled each other. | |
282 | */ | |
283 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
284 | |
285 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
286 | ||
287 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
288 | if (!sg_table) { | |
289 | pr_err("Unable to allocate memory for Ramdisk protection" | |
290 | " scatterlist tables\n"); | |
291 | return -ENOMEM; | |
292 | } | |
293 | ||
294 | rd_dev->sg_prot_array = sg_table; | |
295 | rd_dev->sg_prot_count = sg_tables; | |
296 | ||
297 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
298 | if (rc) | |
299 | return rc; | |
300 | ||
301 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
302 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
303 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
0fd97ccf | 308 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
309 | { |
310 | struct rd_dev *rd_dev; | |
311 | struct rd_host *rd_host = hba->hba_ptr; | |
312 | ||
313 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
314 | if (!rd_dev) { |
315 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
316 | return NULL; |
317 | } | |
318 | ||
319 | rd_dev->rd_host = rd_host; | |
c66ac9db | 320 | |
0fd97ccf | 321 | return &rd_dev->dev; |
c66ac9db NB |
322 | } |
323 | ||
0fd97ccf | 324 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 325 | { |
0fd97ccf CH |
326 | struct rd_dev *rd_dev = RD_DEV(dev); |
327 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
328 | int ret; | |
c66ac9db | 329 | |
0fd97ccf CH |
330 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
331 | pr_debug("Missing rd_pages= parameter\n"); | |
332 | return -EINVAL; | |
333 | } | |
c66ac9db | 334 | |
065f9716 DC |
335 | ret = rd_build_device_space(rd_dev); |
336 | if (ret < 0) | |
c66ac9db NB |
337 | goto fail; |
338 | ||
0fd97ccf CH |
339 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
340 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
341 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
342 | |
343 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 344 | |
8feb58d0 | 345 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 346 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 347 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
348 | rd_dev->sg_table_count, |
349 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
350 | ||
0fd97ccf | 351 | return 0; |
c66ac9db NB |
352 | |
353 | fail: | |
354 | rd_release_device_space(rd_dev); | |
0fd97ccf | 355 | return ret; |
c66ac9db NB |
356 | } |
357 | ||
0fd97ccf | 358 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 359 | { |
0fd97ccf | 360 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
361 | |
362 | rd_release_device_space(rd_dev); | |
363 | kfree(rd_dev); | |
364 | } | |
365 | ||
c66ac9db NB |
366 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
367 | { | |
c66ac9db | 368 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
369 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
370 | sizeof(struct scatterlist)); | |
c66ac9db | 371 | |
8f67835f MS |
372 | i = page / sg_per_table; |
373 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
374 | sg_table = &rd_dev->sg_table_array[i]; |
375 | if ((sg_table->page_start_offset <= page) && | |
376 | (sg_table->page_end_offset >= page)) | |
377 | return sg_table; | |
378 | } | |
379 | ||
6708bb27 | 380 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
381 | page); |
382 | ||
383 | return NULL; | |
384 | } | |
385 | ||
6e611119 NB |
386 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
387 | { | |
388 | struct rd_dev_sg_table *sg_table; | |
389 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
390 | sizeof(struct scatterlist)); | |
391 | ||
392 | i = page / sg_per_table; | |
393 | if (i < rd_dev->sg_prot_count) { | |
394 | sg_table = &rd_dev->sg_prot_array[i]; | |
395 | if ((sg_table->page_start_offset <= page) && | |
396 | (sg_table->page_end_offset >= page)) | |
397 | return sg_table; | |
398 | } | |
399 | ||
400 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
401 | page); | |
402 | ||
403 | return NULL; | |
404 | } | |
405 | ||
6766cc81 AM |
406 | typedef sense_reason_t (*dif_verify)(struct se_cmd *, sector_t, unsigned int, |
407 | unsigned int, struct scatterlist *, int); | |
408 | ||
409 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, dif_verify dif_verify) | |
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 | ||
6766cc81 | 469 | rc = dif_verify(cmd, cmd->t_task_lba, sectors, 0, prot_sg, prot_offset); |
bfd9a53e AM |
470 | if (need_to_release) |
471 | kfree(prot_sg); | |
6766cc81 AM |
472 | |
473 | return rc; | |
474 | } | |
475 | ||
de103c93 | 476 | static sense_reason_t |
a82a9538 NB |
477 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
478 | enum dma_data_direction data_direction) | |
c66ac9db | 479 | { |
5787cacd | 480 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 481 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 482 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
483 | struct scatterlist *rd_sg; |
484 | struct sg_mapping_iter m; | |
8feb58d0 CH |
485 | u32 rd_offset; |
486 | u32 rd_size; | |
487 | u32 rd_page; | |
65b0c78d | 488 | u32 src_len; |
8feb58d0 | 489 | u64 tmp; |
6e611119 | 490 | sense_reason_t rc; |
c66ac9db | 491 | |
52c07423 NB |
492 | if (dev->rd_flags & RDF_NULLIO) { |
493 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
494 | return 0; | |
495 | } | |
496 | ||
0fd97ccf | 497 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
498 | rd_offset = do_div(tmp, PAGE_SIZE); |
499 | rd_page = tmp; | |
5787cacd | 500 | rd_size = cmd->data_length; |
8feb58d0 CH |
501 | |
502 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 503 | if (!table) |
de103c93 | 504 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 505 | |
8feb58d0 | 506 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 507 | |
65b0c78d | 508 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 509 | dev->rd_dev_id, |
5787cacd CH |
510 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
511 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 512 | |
1762742f NB |
513 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
514 | data_direction == DMA_TO_DEVICE) { | |
6766cc81 | 515 | rc = rd_do_prot_rw(cmd, sbc_dif_verify_write); |
6e611119 NB |
516 | if (rc) |
517 | return rc; | |
518 | } | |
519 | ||
65b0c78d | 520 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
521 | sg_miter_start(&m, sgl, sgl_nents, |
522 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
523 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
524 | while (rd_size) { | |
65b0c78d SAS |
525 | u32 len; |
526 | void *rd_addr; | |
c66ac9db | 527 | |
65b0c78d | 528 | sg_miter_next(&m); |
bbf344e5 HR |
529 | if (!(u32)m.length) { |
530 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
531 | dev->rd_dev_id, m.addr, m.length); | |
532 | sg_miter_stop(&m); | |
533 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
534 | } | |
65b0c78d | 535 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
536 | if (len > rd_size) { |
537 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
538 | "size %d\n", dev->rd_dev_id, | |
539 | rd_page, rd_offset, rd_size); | |
540 | len = rd_size; | |
541 | } | |
65b0c78d | 542 | m.consumed = len; |
c66ac9db | 543 | |
65b0c78d | 544 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 545 | |
5787cacd | 546 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
547 | memcpy(m.addr, rd_addr, len); |
548 | else | |
549 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 550 | |
8feb58d0 CH |
551 | rd_size -= len; |
552 | if (!rd_size) | |
c66ac9db NB |
553 | continue; |
554 | ||
65b0c78d SAS |
555 | src_len -= len; |
556 | if (src_len) { | |
557 | rd_offset += len; | |
c66ac9db NB |
558 | continue; |
559 | } | |
6708bb27 | 560 | |
65b0c78d | 561 | /* rd page completed, next one please */ |
8feb58d0 | 562 | rd_page++; |
65b0c78d SAS |
563 | rd_offset = 0; |
564 | src_len = PAGE_SIZE; | |
8feb58d0 | 565 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 566 | rd_sg++; |
c66ac9db NB |
567 | continue; |
568 | } | |
6708bb27 | 569 | |
8feb58d0 | 570 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
571 | if (!table) { |
572 | sg_miter_stop(&m); | |
de103c93 | 573 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 574 | } |
c66ac9db | 575 | |
65b0c78d SAS |
576 | /* since we increment, the first sg entry is correct */ |
577 | rd_sg = table->sg_table; | |
c66ac9db | 578 | } |
65b0c78d | 579 | sg_miter_stop(&m); |
c66ac9db | 580 | |
1762742f NB |
581 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
582 | data_direction == DMA_FROM_DEVICE) { | |
6766cc81 | 583 | rc = rd_do_prot_rw(cmd, sbc_dif_verify_read); |
6e611119 NB |
584 | if (rc) |
585 | return rc; | |
586 | } | |
587 | ||
5787cacd | 588 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 589 | return 0; |
c66ac9db NB |
590 | } |
591 | ||
c66ac9db | 592 | enum { |
52c07423 | 593 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
594 | }; |
595 | ||
596 | static match_table_t tokens = { | |
597 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 598 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
599 | {Opt_err, NULL} |
600 | }; | |
601 | ||
0fd97ccf CH |
602 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
603 | const char *page, ssize_t count) | |
c66ac9db | 604 | { |
0fd97ccf | 605 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
606 | char *orig, *ptr, *opts; |
607 | substring_t args[MAX_OPT_ARGS]; | |
608 | int ret = 0, arg, token; | |
609 | ||
610 | opts = kstrdup(page, GFP_KERNEL); | |
611 | if (!opts) | |
612 | return -ENOMEM; | |
613 | ||
614 | orig = opts; | |
615 | ||
90c161b6 | 616 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
617 | if (!*ptr) |
618 | continue; | |
619 | ||
620 | token = match_token(ptr, tokens, args); | |
621 | switch (token) { | |
622 | case Opt_rd_pages: | |
623 | match_int(args, &arg); | |
624 | rd_dev->rd_page_count = arg; | |
6708bb27 | 625 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
626 | " Count: %u\n", rd_dev->rd_page_count); |
627 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
628 | break; | |
52c07423 NB |
629 | case Opt_rd_nullio: |
630 | match_int(args, &arg); | |
631 | if (arg != 1) | |
632 | break; | |
633 | ||
634 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
635 | rd_dev->rd_flags |= RDF_NULLIO; | |
636 | break; | |
c66ac9db NB |
637 | default: |
638 | break; | |
639 | } | |
640 | } | |
641 | ||
642 | kfree(orig); | |
643 | return (!ret) ? count : ret; | |
644 | } | |
645 | ||
0fd97ccf | 646 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 647 | { |
0fd97ccf | 648 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 649 | |
8feb58d0 CH |
650 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
651 | rd_dev->rd_dev_id); | |
c66ac9db | 652 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
653 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
654 | PAGE_SIZE, rd_dev->sg_table_count, | |
655 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
656 | return bl; |
657 | } | |
658 | ||
c66ac9db NB |
659 | static sector_t rd_get_blocks(struct se_device *dev) |
660 | { | |
0fd97ccf CH |
661 | struct rd_dev *rd_dev = RD_DEV(dev); |
662 | ||
c66ac9db | 663 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 664 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
665 | |
666 | return blocks_long; | |
667 | } | |
668 | ||
d7e8eb5d NB |
669 | static int rd_init_prot(struct se_device *dev) |
670 | { | |
671 | struct rd_dev *rd_dev = RD_DEV(dev); | |
672 | ||
673 | if (!dev->dev_attrib.pi_prot_type) | |
674 | return 0; | |
675 | ||
9d2e59f2 QT |
676 | return rd_build_prot_space(rd_dev, dev->prot_length, |
677 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
678 | } |
679 | ||
680 | static void rd_free_prot(struct se_device *dev) | |
681 | { | |
682 | struct rd_dev *rd_dev = RD_DEV(dev); | |
683 | ||
684 | rd_release_prot_space(rd_dev); | |
685 | } | |
686 | ||
9e999a6c | 687 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
688 | .execute_rw = rd_execute_rw, |
689 | }; | |
690 | ||
de103c93 CH |
691 | static sense_reason_t |
692 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 693 | { |
9e999a6c | 694 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
695 | } |
696 | ||
03a62745 NB |
697 | DEF_TB_DEFAULT_ATTRIBS(rd_mcp); |
698 | ||
699 | static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = { | |
700 | &rd_mcp_dev_attrib_emulate_model_alias.attr, | |
701 | &rd_mcp_dev_attrib_emulate_dpo.attr, | |
702 | &rd_mcp_dev_attrib_emulate_fua_write.attr, | |
703 | &rd_mcp_dev_attrib_emulate_fua_read.attr, | |
704 | &rd_mcp_dev_attrib_emulate_write_cache.attr, | |
705 | &rd_mcp_dev_attrib_emulate_ua_intlck_ctrl.attr, | |
706 | &rd_mcp_dev_attrib_emulate_tas.attr, | |
707 | &rd_mcp_dev_attrib_emulate_tpu.attr, | |
708 | &rd_mcp_dev_attrib_emulate_tpws.attr, | |
709 | &rd_mcp_dev_attrib_emulate_caw.attr, | |
710 | &rd_mcp_dev_attrib_emulate_3pc.attr, | |
711 | &rd_mcp_dev_attrib_pi_prot_type.attr, | |
712 | &rd_mcp_dev_attrib_hw_pi_prot_type.attr, | |
713 | &rd_mcp_dev_attrib_pi_prot_format.attr, | |
714 | &rd_mcp_dev_attrib_enforce_pr_isids.attr, | |
715 | &rd_mcp_dev_attrib_is_nonrot.attr, | |
716 | &rd_mcp_dev_attrib_emulate_rest_reord.attr, | |
717 | &rd_mcp_dev_attrib_force_pr_aptpl.attr, | |
718 | &rd_mcp_dev_attrib_hw_block_size.attr, | |
719 | &rd_mcp_dev_attrib_block_size.attr, | |
720 | &rd_mcp_dev_attrib_hw_max_sectors.attr, | |
03a62745 NB |
721 | &rd_mcp_dev_attrib_optimal_sectors.attr, |
722 | &rd_mcp_dev_attrib_hw_queue_depth.attr, | |
723 | &rd_mcp_dev_attrib_queue_depth.attr, | |
724 | &rd_mcp_dev_attrib_max_unmap_lba_count.attr, | |
725 | &rd_mcp_dev_attrib_max_unmap_block_desc_count.attr, | |
726 | &rd_mcp_dev_attrib_unmap_granularity.attr, | |
727 | &rd_mcp_dev_attrib_unmap_granularity_alignment.attr, | |
728 | &rd_mcp_dev_attrib_max_write_same_len.attr, | |
729 | NULL, | |
730 | }; | |
731 | ||
c66ac9db NB |
732 | static struct se_subsystem_api rd_mcp_template = { |
733 | .name = "rd_mcp", | |
0fd97ccf CH |
734 | .inquiry_prod = "RAMDISK-MCP", |
735 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
736 | .attach_hba = rd_attach_hba, |
737 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
738 | .alloc_device = rd_alloc_device, |
739 | .configure_device = rd_configure_device, | |
c66ac9db | 740 | .free_device = rd_free_device, |
0c2ad7d1 | 741 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
742 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
743 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 744 | .get_device_type = sbc_get_device_type, |
c66ac9db | 745 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
746 | .init_prot = rd_init_prot, |
747 | .free_prot = rd_free_prot, | |
c66ac9db NB |
748 | }; |
749 | ||
750 | int __init rd_module_init(void) | |
751 | { | |
03a62745 | 752 | struct target_backend_cits *tbc = &rd_mcp_template.tb_cits; |
c66ac9db NB |
753 | int ret; |
754 | ||
03a62745 NB |
755 | target_core_setup_sub_cits(&rd_mcp_template); |
756 | tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs; | |
757 | ||
c66ac9db NB |
758 | ret = transport_subsystem_register(&rd_mcp_template); |
759 | if (ret < 0) { | |
c66ac9db NB |
760 | return ret; |
761 | } | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | void rd_module_exit(void) | |
767 | { | |
c66ac9db NB |
768 | transport_subsystem_release(&rd_mcp_template); |
769 | } |