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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> | |
8dcf07be | 29 | #include <linux/highmem.h> |
c66ac9db | 30 | #include <linux/timer.h> |
8dcf07be | 31 | #include <linux/scatterlist.h> |
c66ac9db NB |
32 | #include <linux/slab.h> |
33 | #include <linux/spinlock.h> | |
ba929992 | 34 | #include <scsi/scsi_proto.h> |
c66ac9db NB |
35 | |
36 | #include <target/target_core_base.h> | |
c4795fb2 | 37 | #include <target/target_core_backend.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 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
47 | { | |
48 | struct rd_host *rd_host; | |
49 | ||
5d68fb72 | 50 | rd_host = kzalloc(sizeof(*rd_host), GFP_KERNEL); |
fbc4040b | 51 | if (!rd_host) |
c66ac9db | 52 | return -ENOMEM; |
c66ac9db NB |
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); |
fbc4040b | 149 | if (!sg) |
065f9716 | 150 | return -ENOMEM; |
c66ac9db | 151 | |
bfd9a53e AM |
152 | sg_init_table(sg, sg_per_table + chain_entry); |
153 | ||
bfd9a53e AM |
154 | if (i > 0) { |
155 | sg_chain(sg_table[i - 1].sg_table, | |
156 | max_sg_per_table + 1, sg); | |
157 | } | |
158 | ||
c66ac9db NB |
159 | sg_table[i].sg_table = sg; |
160 | sg_table[i].rd_sg_count = sg_per_table; | |
161 | sg_table[i].page_start_offset = page_offset; | |
162 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
163 | - 1; | |
164 | ||
165 | for (j = 0; j < sg_per_table; j++) { | |
166 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
167 | if (!pg) { |
168 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 169 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 170 | return -ENOMEM; |
c66ac9db NB |
171 | } |
172 | sg_assign_page(&sg[j], pg); | |
173 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
174 | |
175 | p = kmap(pg); | |
176 | memset(p, init_payload, PAGE_SIZE); | |
177 | kunmap(pg); | |
c66ac9db NB |
178 | } |
179 | ||
180 | page_offset += sg_per_table; | |
181 | total_sg_needed -= sg_per_table; | |
182 | } | |
183 | ||
4442dc8a NB |
184 | return 0; |
185 | } | |
186 | ||
187 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
188 | { | |
189 | struct rd_dev_sg_table *sg_table; | |
190 | u32 sg_tables, total_sg_needed; | |
191 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
192 | sizeof(struct scatterlist)); | |
193 | int rc; | |
194 | ||
195 | if (rd_dev->rd_page_count <= 0) { | |
196 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
197 | rd_dev->rd_page_count); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | /* Don't need backing pages for NULLIO */ | |
202 | if (rd_dev->rd_flags & RDF_NULLIO) | |
203 | return 0; | |
204 | ||
205 | total_sg_needed = rd_dev->rd_page_count; | |
206 | ||
207 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
55ec4092 | 208 | sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL); |
fbc4040b | 209 | if (!sg_table) |
4442dc8a | 210 | return -ENOMEM; |
4442dc8a NB |
211 | |
212 | rd_dev->sg_table_array = sg_table; | |
213 | rd_dev->sg_table_count = sg_tables; | |
214 | ||
215 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
216 | if (rc) | |
217 | return rc; | |
218 | ||
6708bb27 | 219 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
220 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
221 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
222 | rd_dev->sg_table_count); | |
c66ac9db NB |
223 | |
224 | return 0; | |
225 | } | |
226 | ||
d7e8eb5d NB |
227 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
228 | { | |
229 | u32 page_count; | |
230 | ||
231 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
232 | return; | |
233 | ||
234 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
235 | rd_dev->sg_prot_count); | |
236 | ||
237 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
238 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
239 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
240 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
241 | ||
242 | rd_dev->sg_prot_array = NULL; | |
243 | rd_dev->sg_prot_count = 0; | |
244 | } | |
245 | ||
9d2e59f2 | 246 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
247 | { |
248 | struct rd_dev_sg_table *sg_table; | |
249 | u32 total_sg_needed, sg_tables; | |
250 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
251 | sizeof(struct scatterlist)); | |
252 | int rc; | |
253 | ||
254 | if (rd_dev->rd_flags & RDF_NULLIO) | |
255 | return 0; | |
9d2e59f2 QT |
256 | /* |
257 | * prot_length=8byte dif data | |
258 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
259 | * (prot_length/block_size) + pad | |
260 | * PGSZ canceled each other. | |
261 | */ | |
262 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
263 | |
264 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
55ec4092 | 265 | sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL); |
fbc4040b | 266 | if (!sg_table) |
d7e8eb5d | 267 | return -ENOMEM; |
d7e8eb5d NB |
268 | |
269 | rd_dev->sg_prot_array = sg_table; | |
270 | rd_dev->sg_prot_count = sg_tables; | |
271 | ||
272 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
273 | if (rc) | |
274 | return rc; | |
275 | ||
276 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
277 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
278 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
0fd97ccf | 283 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
284 | { |
285 | struct rd_dev *rd_dev; | |
286 | struct rd_host *rd_host = hba->hba_ptr; | |
287 | ||
5d68fb72 | 288 | rd_dev = kzalloc(sizeof(*rd_dev), GFP_KERNEL); |
fbc4040b | 289 | if (!rd_dev) |
c66ac9db | 290 | return NULL; |
c66ac9db NB |
291 | |
292 | rd_dev->rd_host = rd_host; | |
c66ac9db | 293 | |
0fd97ccf | 294 | return &rd_dev->dev; |
c66ac9db NB |
295 | } |
296 | ||
0fd97ccf | 297 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 298 | { |
0fd97ccf CH |
299 | struct rd_dev *rd_dev = RD_DEV(dev); |
300 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
301 | int ret; | |
c66ac9db | 302 | |
0fd97ccf CH |
303 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
304 | pr_debug("Missing rd_pages= parameter\n"); | |
305 | return -EINVAL; | |
306 | } | |
c66ac9db | 307 | |
065f9716 DC |
308 | ret = rd_build_device_space(rd_dev); |
309 | if (ret < 0) | |
c66ac9db NB |
310 | goto fail; |
311 | ||
0fd97ccf CH |
312 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
313 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
314 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
5dacbfc9 | 315 | dev->dev_attrib.is_nonrot = 1; |
c66ac9db NB |
316 | |
317 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 318 | |
8feb58d0 | 319 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 320 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 321 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
322 | rd_dev->sg_table_count, |
323 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
324 | ||
0fd97ccf | 325 | return 0; |
c66ac9db NB |
326 | |
327 | fail: | |
328 | rd_release_device_space(rd_dev); | |
0fd97ccf | 329 | return ret; |
c66ac9db NB |
330 | } |
331 | ||
4cc987ea NB |
332 | static void rd_dev_call_rcu(struct rcu_head *p) |
333 | { | |
334 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
335 | struct rd_dev *rd_dev = RD_DEV(dev); | |
336 | ||
337 | kfree(rd_dev); | |
338 | } | |
339 | ||
0fd97ccf | 340 | static void rd_free_device(struct se_device *dev) |
92634706 MC |
341 | { |
342 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); | |
343 | } | |
344 | ||
345 | static void rd_destroy_device(struct se_device *dev) | |
c66ac9db | 346 | { |
0fd97ccf | 347 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
348 | |
349 | rd_release_device_space(rd_dev); | |
c66ac9db NB |
350 | } |
351 | ||
c66ac9db NB |
352 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
353 | { | |
c66ac9db | 354 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
355 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
356 | sizeof(struct scatterlist)); | |
c66ac9db | 357 | |
8f67835f MS |
358 | i = page / sg_per_table; |
359 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
360 | sg_table = &rd_dev->sg_table_array[i]; |
361 | if ((sg_table->page_start_offset <= page) && | |
362 | (sg_table->page_end_offset >= page)) | |
363 | return sg_table; | |
364 | } | |
365 | ||
6708bb27 | 366 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
367 | page); |
368 | ||
369 | return NULL; | |
370 | } | |
371 | ||
6e611119 NB |
372 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
373 | { | |
374 | struct rd_dev_sg_table *sg_table; | |
375 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
376 | sizeof(struct scatterlist)); | |
377 | ||
378 | i = page / sg_per_table; | |
379 | if (i < rd_dev->sg_prot_count) { | |
380 | sg_table = &rd_dev->sg_prot_array[i]; | |
381 | if ((sg_table->page_start_offset <= page) && | |
382 | (sg_table->page_end_offset >= page)) | |
383 | return sg_table; | |
384 | } | |
385 | ||
386 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
387 | page); | |
388 | ||
389 | return NULL; | |
390 | } | |
391 | ||
f75b6fae | 392 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
6766cc81 AM |
393 | { |
394 | struct se_device *se_dev = cmd->se_dev; | |
395 | struct rd_dev *dev = RD_DEV(se_dev); | |
396 | struct rd_dev_sg_table *prot_table; | |
397 | struct scatterlist *prot_sg; | |
398 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
399 | u32 prot_offset, prot_page; | |
bfd9a53e | 400 | u32 prot_npages __maybe_unused; |
6766cc81 | 401 | u64 tmp; |
056e8924 | 402 | sense_reason_t rc = 0; |
6766cc81 AM |
403 | |
404 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
405 | prot_offset = do_div(tmp, PAGE_SIZE); | |
406 | prot_page = tmp; | |
407 | ||
408 | prot_table = rd_get_prot_table(dev, prot_page); | |
409 | if (!prot_table) | |
410 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
411 | ||
412 | prot_sg = &prot_table->sg_table[prot_page - | |
413 | prot_table->page_start_offset]; | |
414 | ||
056e8924 DM |
415 | if (se_dev->dev_attrib.pi_prot_verify) { |
416 | if (is_read) | |
417 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
418 | prot_sg, prot_offset); | |
419 | else | |
420 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
421 | cmd->t_prot_sg, 0); | |
422 | } | |
f75b6fae SG |
423 | if (!rc) |
424 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); | |
425 | ||
6766cc81 AM |
426 | return rc; |
427 | } | |
428 | ||
de103c93 | 429 | static sense_reason_t |
a82a9538 NB |
430 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
431 | enum dma_data_direction data_direction) | |
c66ac9db | 432 | { |
5787cacd | 433 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 434 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 435 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
436 | struct scatterlist *rd_sg; |
437 | struct sg_mapping_iter m; | |
8feb58d0 CH |
438 | u32 rd_offset; |
439 | u32 rd_size; | |
440 | u32 rd_page; | |
65b0c78d | 441 | u32 src_len; |
8feb58d0 | 442 | u64 tmp; |
6e611119 | 443 | sense_reason_t rc; |
c66ac9db | 444 | |
52c07423 NB |
445 | if (dev->rd_flags & RDF_NULLIO) { |
446 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
447 | return 0; | |
448 | } | |
449 | ||
0fd97ccf | 450 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
451 | rd_offset = do_div(tmp, PAGE_SIZE); |
452 | rd_page = tmp; | |
5787cacd | 453 | rd_size = cmd->data_length; |
8feb58d0 CH |
454 | |
455 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 456 | if (!table) |
de103c93 | 457 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 458 | |
8feb58d0 | 459 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 460 | |
65b0c78d | 461 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 462 | dev->rd_dev_id, |
5787cacd CH |
463 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
464 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 465 | |
1762742f NB |
466 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
467 | data_direction == DMA_TO_DEVICE) { | |
f75b6fae | 468 | rc = rd_do_prot_rw(cmd, false); |
6e611119 NB |
469 | if (rc) |
470 | return rc; | |
471 | } | |
472 | ||
65b0c78d | 473 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
474 | sg_miter_start(&m, sgl, sgl_nents, |
475 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
476 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
477 | while (rd_size) { | |
65b0c78d SAS |
478 | u32 len; |
479 | void *rd_addr; | |
c66ac9db | 480 | |
65b0c78d | 481 | sg_miter_next(&m); |
bbf344e5 HR |
482 | if (!(u32)m.length) { |
483 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
484 | dev->rd_dev_id, m.addr, m.length); | |
485 | sg_miter_stop(&m); | |
486 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
487 | } | |
65b0c78d | 488 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
489 | if (len > rd_size) { |
490 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
491 | "size %d\n", dev->rd_dev_id, | |
492 | rd_page, rd_offset, rd_size); | |
493 | len = rd_size; | |
494 | } | |
65b0c78d | 495 | m.consumed = len; |
c66ac9db | 496 | |
65b0c78d | 497 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 498 | |
5787cacd | 499 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
500 | memcpy(m.addr, rd_addr, len); |
501 | else | |
502 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 503 | |
8feb58d0 CH |
504 | rd_size -= len; |
505 | if (!rd_size) | |
c66ac9db NB |
506 | continue; |
507 | ||
65b0c78d SAS |
508 | src_len -= len; |
509 | if (src_len) { | |
510 | rd_offset += len; | |
c66ac9db NB |
511 | continue; |
512 | } | |
6708bb27 | 513 | |
65b0c78d | 514 | /* rd page completed, next one please */ |
8feb58d0 | 515 | rd_page++; |
65b0c78d SAS |
516 | rd_offset = 0; |
517 | src_len = PAGE_SIZE; | |
8feb58d0 | 518 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 519 | rd_sg++; |
c66ac9db NB |
520 | continue; |
521 | } | |
6708bb27 | 522 | |
8feb58d0 | 523 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
524 | if (!table) { |
525 | sg_miter_stop(&m); | |
de103c93 | 526 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 527 | } |
c66ac9db | 528 | |
65b0c78d SAS |
529 | /* since we increment, the first sg entry is correct */ |
530 | rd_sg = table->sg_table; | |
c66ac9db | 531 | } |
65b0c78d | 532 | sg_miter_stop(&m); |
c66ac9db | 533 | |
1762742f NB |
534 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
535 | data_direction == DMA_FROM_DEVICE) { | |
f75b6fae | 536 | rc = rd_do_prot_rw(cmd, true); |
6e611119 NB |
537 | if (rc) |
538 | return rc; | |
539 | } | |
540 | ||
5787cacd | 541 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 542 | return 0; |
c66ac9db NB |
543 | } |
544 | ||
c66ac9db | 545 | enum { |
52c07423 | 546 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
547 | }; |
548 | ||
549 | static match_table_t tokens = { | |
550 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 551 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
552 | {Opt_err, NULL} |
553 | }; | |
554 | ||
0fd97ccf CH |
555 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
556 | const char *page, ssize_t count) | |
c66ac9db | 557 | { |
0fd97ccf | 558 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
559 | char *orig, *ptr, *opts; |
560 | substring_t args[MAX_OPT_ARGS]; | |
fb418240 | 561 | int arg, token; |
c66ac9db NB |
562 | |
563 | opts = kstrdup(page, GFP_KERNEL); | |
564 | if (!opts) | |
565 | return -ENOMEM; | |
566 | ||
567 | orig = opts; | |
568 | ||
90c161b6 | 569 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
570 | if (!*ptr) |
571 | continue; | |
572 | ||
573 | token = match_token(ptr, tokens, args); | |
574 | switch (token) { | |
575 | case Opt_rd_pages: | |
576 | match_int(args, &arg); | |
577 | rd_dev->rd_page_count = arg; | |
6708bb27 | 578 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
579 | " Count: %u\n", rd_dev->rd_page_count); |
580 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
581 | break; | |
52c07423 NB |
582 | case Opt_rd_nullio: |
583 | match_int(args, &arg); | |
584 | if (arg != 1) | |
585 | break; | |
586 | ||
587 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
588 | rd_dev->rd_flags |= RDF_NULLIO; | |
589 | break; | |
c66ac9db NB |
590 | default: |
591 | break; | |
592 | } | |
593 | } | |
594 | ||
595 | kfree(orig); | |
fb418240 | 596 | return count; |
c66ac9db NB |
597 | } |
598 | ||
0fd97ccf | 599 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 600 | { |
0fd97ccf | 601 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 602 | |
8feb58d0 CH |
603 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
604 | rd_dev->rd_dev_id); | |
c66ac9db | 605 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
606 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
607 | PAGE_SIZE, rd_dev->sg_table_count, | |
608 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
609 | return bl; |
610 | } | |
611 | ||
c66ac9db NB |
612 | static sector_t rd_get_blocks(struct se_device *dev) |
613 | { | |
0fd97ccf CH |
614 | struct rd_dev *rd_dev = RD_DEV(dev); |
615 | ||
c66ac9db | 616 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 617 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
618 | |
619 | return blocks_long; | |
620 | } | |
621 | ||
d7e8eb5d NB |
622 | static int rd_init_prot(struct se_device *dev) |
623 | { | |
624 | struct rd_dev *rd_dev = RD_DEV(dev); | |
625 | ||
626 | if (!dev->dev_attrib.pi_prot_type) | |
627 | return 0; | |
628 | ||
9d2e59f2 QT |
629 | return rd_build_prot_space(rd_dev, dev->prot_length, |
630 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
631 | } |
632 | ||
633 | static void rd_free_prot(struct se_device *dev) | |
634 | { | |
635 | struct rd_dev *rd_dev = RD_DEV(dev); | |
636 | ||
637 | rd_release_prot_space(rd_dev); | |
638 | } | |
639 | ||
9e999a6c | 640 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
641 | .execute_rw = rd_execute_rw, |
642 | }; | |
643 | ||
de103c93 CH |
644 | static sense_reason_t |
645 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 646 | { |
9e999a6c | 647 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
648 | } |
649 | ||
0a06d430 | 650 | static const struct target_backend_ops rd_mcp_ops = { |
c66ac9db | 651 | .name = "rd_mcp", |
0fd97ccf CH |
652 | .inquiry_prod = "RAMDISK-MCP", |
653 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
654 | .attach_hba = rd_attach_hba, |
655 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
656 | .alloc_device = rd_alloc_device, |
657 | .configure_device = rd_configure_device, | |
92634706 | 658 | .destroy_device = rd_destroy_device, |
c66ac9db | 659 | .free_device = rd_free_device, |
0c2ad7d1 | 660 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
661 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
662 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 663 | .get_device_type = sbc_get_device_type, |
c66ac9db | 664 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
665 | .init_prot = rd_init_prot, |
666 | .free_prot = rd_free_prot, | |
5873c4d1 | 667 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
668 | }; |
669 | ||
670 | int __init rd_module_init(void) | |
671 | { | |
0a06d430 | 672 | return transport_backend_register(&rd_mcp_ops); |
c66ac9db NB |
673 | } |
674 | ||
675 | void rd_module_exit(void) | |
676 | { | |
0a06d430 | 677 | target_backend_unregister(&rd_mcp_ops); |
c66ac9db | 678 | } |