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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c66ac9db NB |
2 | /******************************************************************************* |
3 | * Filename: target_core_rd.c | |
4 | * | |
5 | * This file contains the Storage Engine <-> Ramdisk transport | |
6 | * specific functions. | |
7 | * | |
4c76251e | 8 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
9 | * |
10 | * Nicholas A. Bellinger <nab@kernel.org> | |
11 | * | |
c66ac9db NB |
12 | ******************************************************************************/ |
13 | ||
c66ac9db NB |
14 | #include <linux/string.h> |
15 | #include <linux/parser.h> | |
8dcf07be | 16 | #include <linux/highmem.h> |
c66ac9db | 17 | #include <linux/timer.h> |
8dcf07be | 18 | #include <linux/scatterlist.h> |
c66ac9db NB |
19 | #include <linux/slab.h> |
20 | #include <linux/spinlock.h> | |
ba929992 | 21 | #include <scsi/scsi_proto.h> |
c66ac9db NB |
22 | |
23 | #include <target/target_core_base.h> | |
c4795fb2 | 24 | #include <target/target_core_backend.h> |
c66ac9db NB |
25 | |
26 | #include "target_core_rd.h" | |
27 | ||
0fd97ccf CH |
28 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
29 | { | |
30 | return container_of(dev, struct rd_dev, dev); | |
31 | } | |
c66ac9db | 32 | |
c66ac9db NB |
33 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
34 | { | |
35 | struct rd_host *rd_host; | |
36 | ||
5d68fb72 | 37 | rd_host = kzalloc(sizeof(*rd_host), GFP_KERNEL); |
fbc4040b | 38 | if (!rd_host) |
c66ac9db | 39 | return -ENOMEM; |
c66ac9db NB |
40 | |
41 | rd_host->rd_host_id = host_id; | |
42 | ||
5951146d | 43 | hba->hba_ptr = rd_host; |
c66ac9db | 44 | |
6708bb27 | 45 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db | 46 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 47 | RD_HBA_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
48 | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static void rd_detach_hba(struct se_hba *hba) | |
53 | { | |
54 | struct rd_host *rd_host = hba->hba_ptr; | |
55 | ||
6708bb27 | 56 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
57 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
58 | ||
59 | kfree(rd_host); | |
60 | hba->hba_ptr = NULL; | |
61 | } | |
62 | ||
4442dc8a NB |
63 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
64 | u32 sg_table_count) | |
c66ac9db | 65 | { |
c66ac9db NB |
66 | struct page *pg; |
67 | struct scatterlist *sg; | |
4442dc8a | 68 | u32 i, j, page_count = 0, sg_per_table; |
c66ac9db | 69 | |
4442dc8a | 70 | for (i = 0; i < sg_table_count; i++) { |
c66ac9db NB |
71 | sg = sg_table[i].sg_table; |
72 | sg_per_table = sg_table[i].rd_sg_count; | |
73 | ||
74 | for (j = 0; j < sg_per_table; j++) { | |
75 | pg = sg_page(&sg[j]); | |
6708bb27 | 76 | if (pg) { |
c66ac9db NB |
77 | __free_page(pg); |
78 | page_count++; | |
79 | } | |
80 | } | |
c66ac9db NB |
81 | kfree(sg); |
82 | } | |
83 | ||
4442dc8a NB |
84 | kfree(sg_table); |
85 | return page_count; | |
86 | } | |
87 | ||
88 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
89 | { | |
90 | u32 page_count; | |
91 | ||
92 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
93 | return; | |
94 | ||
95 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, | |
96 | rd_dev->sg_table_count); | |
97 | ||
6708bb27 | 98 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
99 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
100 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
101 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
102 | ||
c66ac9db NB |
103 | rd_dev->sg_table_array = NULL; |
104 | rd_dev->sg_table_count = 0; | |
105 | } | |
106 | ||
107 | ||
108 | /* rd_build_device_space(): | |
109 | * | |
110 | * | |
111 | */ | |
4442dc8a NB |
112 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
113 | u32 total_sg_needed, unsigned char init_payload) | |
c66ac9db | 114 | { |
4442dc8a | 115 | u32 i = 0, j, page_offset = 0, sg_per_table; |
c66ac9db NB |
116 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
117 | sizeof(struct scatterlist)); | |
c66ac9db NB |
118 | struct page *pg; |
119 | struct scatterlist *sg; | |
4442dc8a | 120 | unsigned char *p; |
c66ac9db NB |
121 | |
122 | while (total_sg_needed) { | |
bfd9a53e AM |
123 | unsigned int chain_entry = 0; |
124 | ||
c66ac9db NB |
125 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
126 | max_sg_per_table : total_sg_needed; | |
127 | ||
bfd9a53e AM |
128 | /* |
129 | * Reserve extra element for chain entry | |
130 | */ | |
131 | if (sg_per_table < total_sg_needed) | |
132 | chain_entry = 1; | |
133 | ||
4b217e01 | 134 | sg = kmalloc_array(sg_per_table + chain_entry, sizeof(*sg), |
c66ac9db | 135 | GFP_KERNEL); |
fbc4040b | 136 | if (!sg) |
065f9716 | 137 | return -ENOMEM; |
c66ac9db | 138 | |
bfd9a53e AM |
139 | sg_init_table(sg, sg_per_table + chain_entry); |
140 | ||
bfd9a53e AM |
141 | if (i > 0) { |
142 | sg_chain(sg_table[i - 1].sg_table, | |
143 | max_sg_per_table + 1, sg); | |
144 | } | |
145 | ||
c66ac9db NB |
146 | sg_table[i].sg_table = sg; |
147 | sg_table[i].rd_sg_count = sg_per_table; | |
148 | sg_table[i].page_start_offset = page_offset; | |
149 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
150 | - 1; | |
151 | ||
152 | for (j = 0; j < sg_per_table; j++) { | |
153 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
154 | if (!pg) { |
155 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 156 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 157 | return -ENOMEM; |
c66ac9db NB |
158 | } |
159 | sg_assign_page(&sg[j], pg); | |
160 | sg[j].length = PAGE_SIZE; | |
4442dc8a NB |
161 | |
162 | p = kmap(pg); | |
163 | memset(p, init_payload, PAGE_SIZE); | |
164 | kunmap(pg); | |
c66ac9db NB |
165 | } |
166 | ||
167 | page_offset += sg_per_table; | |
168 | total_sg_needed -= sg_per_table; | |
169 | } | |
170 | ||
4442dc8a NB |
171 | return 0; |
172 | } | |
173 | ||
174 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
175 | { | |
176 | struct rd_dev_sg_table *sg_table; | |
177 | u32 sg_tables, total_sg_needed; | |
178 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
179 | sizeof(struct scatterlist)); | |
180 | int rc; | |
181 | ||
182 | if (rd_dev->rd_page_count <= 0) { | |
183 | pr_err("Illegal page count: %u for Ramdisk device\n", | |
184 | rd_dev->rd_page_count); | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
188 | /* Don't need backing pages for NULLIO */ | |
189 | if (rd_dev->rd_flags & RDF_NULLIO) | |
190 | return 0; | |
191 | ||
192 | total_sg_needed = rd_dev->rd_page_count; | |
193 | ||
194 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
55ec4092 | 195 | sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL); |
fbc4040b | 196 | if (!sg_table) |
4442dc8a | 197 | return -ENOMEM; |
4442dc8a NB |
198 | |
199 | rd_dev->sg_table_array = sg_table; | |
200 | rd_dev->sg_table_count = sg_tables; | |
201 | ||
202 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); | |
203 | if (rc) | |
204 | return rc; | |
205 | ||
6708bb27 | 206 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
4442dc8a NB |
207 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
208 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
209 | rd_dev->sg_table_count); | |
c66ac9db NB |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
d7e8eb5d NB |
214 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
215 | { | |
216 | u32 page_count; | |
217 | ||
218 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) | |
219 | return; | |
220 | ||
221 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, | |
222 | rd_dev->sg_prot_count); | |
223 | ||
224 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" | |
225 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
226 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
227 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
228 | ||
229 | rd_dev->sg_prot_array = NULL; | |
230 | rd_dev->sg_prot_count = 0; | |
231 | } | |
232 | ||
9d2e59f2 | 233 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
d7e8eb5d NB |
234 | { |
235 | struct rd_dev_sg_table *sg_table; | |
236 | u32 total_sg_needed, sg_tables; | |
237 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
238 | sizeof(struct scatterlist)); | |
239 | int rc; | |
240 | ||
241 | if (rd_dev->rd_flags & RDF_NULLIO) | |
242 | return 0; | |
9d2e59f2 QT |
243 | /* |
244 | * prot_length=8byte dif data | |
245 | * tot sg needed = rd_page_count * (PGSZ/block_size) * | |
246 | * (prot_length/block_size) + pad | |
247 | * PGSZ canceled each other. | |
248 | */ | |
249 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; | |
d7e8eb5d NB |
250 | |
251 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
55ec4092 | 252 | sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL); |
fbc4040b | 253 | if (!sg_table) |
d7e8eb5d | 254 | return -ENOMEM; |
d7e8eb5d NB |
255 | |
256 | rd_dev->sg_prot_array = sg_table; | |
257 | rd_dev->sg_prot_count = sg_tables; | |
258 | ||
259 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); | |
260 | if (rc) | |
261 | return rc; | |
262 | ||
263 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" | |
264 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
265 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
0fd97ccf | 270 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
271 | { |
272 | struct rd_dev *rd_dev; | |
273 | struct rd_host *rd_host = hba->hba_ptr; | |
274 | ||
5d68fb72 | 275 | rd_dev = kzalloc(sizeof(*rd_dev), GFP_KERNEL); |
fbc4040b | 276 | if (!rd_dev) |
c66ac9db | 277 | return NULL; |
c66ac9db NB |
278 | |
279 | rd_dev->rd_host = rd_host; | |
c66ac9db | 280 | |
0fd97ccf | 281 | return &rd_dev->dev; |
c66ac9db NB |
282 | } |
283 | ||
0fd97ccf | 284 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 285 | { |
0fd97ccf CH |
286 | struct rd_dev *rd_dev = RD_DEV(dev); |
287 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
288 | int ret; | |
c66ac9db | 289 | |
0fd97ccf CH |
290 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
291 | pr_debug("Missing rd_pages= parameter\n"); | |
292 | return -EINVAL; | |
293 | } | |
c66ac9db | 294 | |
065f9716 DC |
295 | ret = rd_build_device_space(rd_dev); |
296 | if (ret < 0) | |
c66ac9db NB |
297 | goto fail; |
298 | ||
0fd97ccf CH |
299 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
300 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
301 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
5dacbfc9 | 302 | dev->dev_attrib.is_nonrot = 1; |
c66ac9db NB |
303 | |
304 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 305 | |
8feb58d0 | 306 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 307 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 308 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
309 | rd_dev->sg_table_count, |
310 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
311 | ||
0fd97ccf | 312 | return 0; |
c66ac9db NB |
313 | |
314 | fail: | |
315 | rd_release_device_space(rd_dev); | |
0fd97ccf | 316 | return ret; |
c66ac9db NB |
317 | } |
318 | ||
4cc987ea NB |
319 | static void rd_dev_call_rcu(struct rcu_head *p) |
320 | { | |
321 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
322 | struct rd_dev *rd_dev = RD_DEV(dev); | |
323 | ||
324 | kfree(rd_dev); | |
325 | } | |
326 | ||
0fd97ccf | 327 | static void rd_free_device(struct se_device *dev) |
92634706 MC |
328 | { |
329 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); | |
330 | } | |
331 | ||
332 | static void rd_destroy_device(struct se_device *dev) | |
c66ac9db | 333 | { |
0fd97ccf | 334 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
335 | |
336 | rd_release_device_space(rd_dev); | |
c66ac9db NB |
337 | } |
338 | ||
c66ac9db NB |
339 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
340 | { | |
c66ac9db | 341 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
342 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
343 | sizeof(struct scatterlist)); | |
c66ac9db | 344 | |
8f67835f MS |
345 | i = page / sg_per_table; |
346 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
347 | sg_table = &rd_dev->sg_table_array[i]; |
348 | if ((sg_table->page_start_offset <= page) && | |
349 | (sg_table->page_end_offset >= page)) | |
350 | return sg_table; | |
351 | } | |
352 | ||
6708bb27 | 353 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
354 | page); |
355 | ||
356 | return NULL; | |
357 | } | |
358 | ||
6e611119 NB |
359 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
360 | { | |
361 | struct rd_dev_sg_table *sg_table; | |
362 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
363 | sizeof(struct scatterlist)); | |
364 | ||
365 | i = page / sg_per_table; | |
366 | if (i < rd_dev->sg_prot_count) { | |
367 | sg_table = &rd_dev->sg_prot_array[i]; | |
368 | if ((sg_table->page_start_offset <= page) && | |
369 | (sg_table->page_end_offset >= page)) | |
370 | return sg_table; | |
371 | } | |
372 | ||
373 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", | |
374 | page); | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
f75b6fae | 379 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
6766cc81 AM |
380 | { |
381 | struct se_device *se_dev = cmd->se_dev; | |
382 | struct rd_dev *dev = RD_DEV(se_dev); | |
383 | struct rd_dev_sg_table *prot_table; | |
384 | struct scatterlist *prot_sg; | |
385 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; | |
386 | u32 prot_offset, prot_page; | |
bfd9a53e | 387 | u32 prot_npages __maybe_unused; |
6766cc81 | 388 | u64 tmp; |
056e8924 | 389 | sense_reason_t rc = 0; |
6766cc81 AM |
390 | |
391 | tmp = cmd->t_task_lba * se_dev->prot_length; | |
392 | prot_offset = do_div(tmp, PAGE_SIZE); | |
393 | prot_page = tmp; | |
394 | ||
395 | prot_table = rd_get_prot_table(dev, prot_page); | |
396 | if (!prot_table) | |
397 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
398 | ||
399 | prot_sg = &prot_table->sg_table[prot_page - | |
400 | prot_table->page_start_offset]; | |
401 | ||
056e8924 DM |
402 | if (se_dev->dev_attrib.pi_prot_verify) { |
403 | if (is_read) | |
404 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
405 | prot_sg, prot_offset); | |
406 | else | |
407 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, | |
408 | cmd->t_prot_sg, 0); | |
409 | } | |
f75b6fae SG |
410 | if (!rc) |
411 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); | |
412 | ||
6766cc81 AM |
413 | return rc; |
414 | } | |
415 | ||
de103c93 | 416 | static sense_reason_t |
a82a9538 NB |
417 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
418 | enum dma_data_direction data_direction) | |
c66ac9db | 419 | { |
5787cacd | 420 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 421 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 422 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
423 | struct scatterlist *rd_sg; |
424 | struct sg_mapping_iter m; | |
8feb58d0 CH |
425 | u32 rd_offset; |
426 | u32 rd_size; | |
427 | u32 rd_page; | |
65b0c78d | 428 | u32 src_len; |
8feb58d0 | 429 | u64 tmp; |
6e611119 | 430 | sense_reason_t rc; |
c66ac9db | 431 | |
52c07423 NB |
432 | if (dev->rd_flags & RDF_NULLIO) { |
433 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
434 | return 0; | |
435 | } | |
436 | ||
0fd97ccf | 437 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
438 | rd_offset = do_div(tmp, PAGE_SIZE); |
439 | rd_page = tmp; | |
5787cacd | 440 | rd_size = cmd->data_length; |
8feb58d0 CH |
441 | |
442 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 443 | if (!table) |
de103c93 | 444 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 445 | |
8feb58d0 | 446 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 447 | |
65b0c78d | 448 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 449 | dev->rd_dev_id, |
5787cacd CH |
450 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
451 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 452 | |
1762742f NB |
453 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
454 | data_direction == DMA_TO_DEVICE) { | |
f75b6fae | 455 | rc = rd_do_prot_rw(cmd, false); |
6e611119 NB |
456 | if (rc) |
457 | return rc; | |
458 | } | |
459 | ||
65b0c78d | 460 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
461 | sg_miter_start(&m, sgl, sgl_nents, |
462 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
463 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
464 | while (rd_size) { | |
65b0c78d SAS |
465 | u32 len; |
466 | void *rd_addr; | |
c66ac9db | 467 | |
65b0c78d | 468 | sg_miter_next(&m); |
bbf344e5 HR |
469 | if (!(u32)m.length) { |
470 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
471 | dev->rd_dev_id, m.addr, m.length); | |
472 | sg_miter_stop(&m); | |
473 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
474 | } | |
65b0c78d | 475 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
476 | if (len > rd_size) { |
477 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
478 | "size %d\n", dev->rd_dev_id, | |
479 | rd_page, rd_offset, rd_size); | |
480 | len = rd_size; | |
481 | } | |
65b0c78d | 482 | m.consumed = len; |
c66ac9db | 483 | |
65b0c78d | 484 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 485 | |
5787cacd | 486 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
487 | memcpy(m.addr, rd_addr, len); |
488 | else | |
489 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 490 | |
8feb58d0 CH |
491 | rd_size -= len; |
492 | if (!rd_size) | |
c66ac9db NB |
493 | continue; |
494 | ||
65b0c78d SAS |
495 | src_len -= len; |
496 | if (src_len) { | |
497 | rd_offset += len; | |
c66ac9db NB |
498 | continue; |
499 | } | |
6708bb27 | 500 | |
65b0c78d | 501 | /* rd page completed, next one please */ |
8feb58d0 | 502 | rd_page++; |
65b0c78d SAS |
503 | rd_offset = 0; |
504 | src_len = PAGE_SIZE; | |
8feb58d0 | 505 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 506 | rd_sg++; |
c66ac9db NB |
507 | continue; |
508 | } | |
6708bb27 | 509 | |
8feb58d0 | 510 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
511 | if (!table) { |
512 | sg_miter_stop(&m); | |
de103c93 | 513 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 514 | } |
c66ac9db | 515 | |
65b0c78d SAS |
516 | /* since we increment, the first sg entry is correct */ |
517 | rd_sg = table->sg_table; | |
c66ac9db | 518 | } |
65b0c78d | 519 | sg_miter_stop(&m); |
c66ac9db | 520 | |
1762742f NB |
521 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
522 | data_direction == DMA_FROM_DEVICE) { | |
f75b6fae | 523 | rc = rd_do_prot_rw(cmd, true); |
6e611119 NB |
524 | if (rc) |
525 | return rc; | |
526 | } | |
527 | ||
5787cacd | 528 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 529 | return 0; |
c66ac9db NB |
530 | } |
531 | ||
c66ac9db | 532 | enum { |
0aecfa66 | 533 | Opt_rd_pages, Opt_rd_nullio, Opt_rd_dummy, Opt_err |
c66ac9db NB |
534 | }; |
535 | ||
536 | static match_table_t tokens = { | |
537 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 538 | {Opt_rd_nullio, "rd_nullio=%d"}, |
0aecfa66 | 539 | {Opt_rd_dummy, "rd_dummy=%d"}, |
c66ac9db NB |
540 | {Opt_err, NULL} |
541 | }; | |
542 | ||
0fd97ccf CH |
543 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
544 | const char *page, ssize_t count) | |
c66ac9db | 545 | { |
0fd97ccf | 546 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
547 | char *orig, *ptr, *opts; |
548 | substring_t args[MAX_OPT_ARGS]; | |
fb418240 | 549 | int arg, token; |
c66ac9db NB |
550 | |
551 | opts = kstrdup(page, GFP_KERNEL); | |
552 | if (!opts) | |
553 | return -ENOMEM; | |
554 | ||
555 | orig = opts; | |
556 | ||
90c161b6 | 557 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
558 | if (!*ptr) |
559 | continue; | |
560 | ||
561 | token = match_token(ptr, tokens, args); | |
562 | switch (token) { | |
563 | case Opt_rd_pages: | |
564 | match_int(args, &arg); | |
565 | rd_dev->rd_page_count = arg; | |
6708bb27 | 566 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
567 | " Count: %u\n", rd_dev->rd_page_count); |
568 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
569 | break; | |
52c07423 NB |
570 | case Opt_rd_nullio: |
571 | match_int(args, &arg); | |
572 | if (arg != 1) | |
573 | break; | |
574 | ||
575 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
576 | rd_dev->rd_flags |= RDF_NULLIO; | |
577 | break; | |
0aecfa66 KS |
578 | case Opt_rd_dummy: |
579 | match_int(args, &arg); | |
580 | if (arg != 1) | |
581 | break; | |
582 | ||
583 | pr_debug("RAMDISK: Setting DUMMY flag: %d\n", arg); | |
584 | rd_dev->rd_flags |= RDF_DUMMY; | |
585 | break; | |
c66ac9db NB |
586 | default: |
587 | break; | |
588 | } | |
589 | } | |
590 | ||
591 | kfree(orig); | |
fb418240 | 592 | return count; |
c66ac9db NB |
593 | } |
594 | ||
0fd97ccf | 595 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 596 | { |
0fd97ccf | 597 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 598 | |
8feb58d0 CH |
599 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
600 | rd_dev->rd_dev_id); | |
c66ac9db | 601 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
0aecfa66 KS |
602 | " SG_table_count: %u nullio: %d dummy: %d\n", |
603 | rd_dev->rd_page_count, | |
52c07423 | 604 | PAGE_SIZE, rd_dev->sg_table_count, |
0aecfa66 KS |
605 | !!(rd_dev->rd_flags & RDF_NULLIO), |
606 | !!(rd_dev->rd_flags & RDF_DUMMY)); | |
c66ac9db NB |
607 | return bl; |
608 | } | |
609 | ||
0aecfa66 KS |
610 | static u32 rd_get_device_type(struct se_device *dev) |
611 | { | |
612 | if (RD_DEV(dev)->rd_flags & RDF_DUMMY) | |
613 | return 0x3f; /* Unknown device type, not connected */ | |
614 | else | |
615 | return sbc_get_device_type(dev); | |
616 | } | |
617 | ||
c66ac9db NB |
618 | static sector_t rd_get_blocks(struct se_device *dev) |
619 | { | |
0fd97ccf CH |
620 | struct rd_dev *rd_dev = RD_DEV(dev); |
621 | ||
c66ac9db | 622 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 623 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
624 | |
625 | return blocks_long; | |
626 | } | |
627 | ||
d7e8eb5d NB |
628 | static int rd_init_prot(struct se_device *dev) |
629 | { | |
630 | struct rd_dev *rd_dev = RD_DEV(dev); | |
631 | ||
632 | if (!dev->dev_attrib.pi_prot_type) | |
633 | return 0; | |
634 | ||
9d2e59f2 QT |
635 | return rd_build_prot_space(rd_dev, dev->prot_length, |
636 | dev->dev_attrib.block_size); | |
d7e8eb5d NB |
637 | } |
638 | ||
639 | static void rd_free_prot(struct se_device *dev) | |
640 | { | |
641 | struct rd_dev *rd_dev = RD_DEV(dev); | |
642 | ||
643 | rd_release_prot_space(rd_dev); | |
644 | } | |
645 | ||
9e999a6c | 646 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
647 | .execute_rw = rd_execute_rw, |
648 | }; | |
649 | ||
de103c93 CH |
650 | static sense_reason_t |
651 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 652 | { |
9e999a6c | 653 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
654 | } |
655 | ||
0a06d430 | 656 | static const struct target_backend_ops rd_mcp_ops = { |
c66ac9db | 657 | .name = "rd_mcp", |
0fd97ccf CH |
658 | .inquiry_prod = "RAMDISK-MCP", |
659 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
660 | .attach_hba = rd_attach_hba, |
661 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
662 | .alloc_device = rd_alloc_device, |
663 | .configure_device = rd_configure_device, | |
92634706 | 664 | .destroy_device = rd_destroy_device, |
c66ac9db | 665 | .free_device = rd_free_device, |
0c2ad7d1 | 666 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
667 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
668 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
0aecfa66 | 669 | .get_device_type = rd_get_device_type, |
c66ac9db | 670 | .get_blocks = rd_get_blocks, |
d7e8eb5d NB |
671 | .init_prot = rd_init_prot, |
672 | .free_prot = rd_free_prot, | |
5873c4d1 | 673 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
674 | }; |
675 | ||
676 | int __init rd_module_init(void) | |
677 | { | |
0a06d430 | 678 | return transport_backend_register(&rd_mcp_ops); |
c66ac9db NB |
679 | } |
680 | ||
681 | void rd_module_exit(void) | |
682 | { | |
0a06d430 | 683 | target_backend_unregister(&rd_mcp_ops); |
c66ac9db | 684 | } |