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 | * | |
7 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. | |
8 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
9 | * Copyright (c) 2007-2010 Rising Tide Systems | |
10 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
11 | * | |
12 | * Nicholas A. Bellinger <nab@kernel.org> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
27 | * | |
28 | ******************************************************************************/ | |
29 | ||
30 | #include <linux/version.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/parser.h> | |
33 | #include <linux/timer.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/spinlock.h> | |
c66ac9db NB |
37 | #include <scsi/scsi.h> |
38 | #include <scsi/scsi_host.h> | |
39 | ||
40 | #include <target/target_core_base.h> | |
41 | #include <target/target_core_device.h> | |
42 | #include <target/target_core_transport.h> | |
43 | #include <target/target_core_fabric_ops.h> | |
44 | ||
45 | #include "target_core_rd.h" | |
46 | ||
c66ac9db NB |
47 | static struct se_subsystem_api rd_mcp_template; |
48 | ||
c66ac9db NB |
49 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
50 | * | |
51 | * | |
52 | */ | |
53 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
54 | { | |
55 | struct rd_host *rd_host; | |
56 | ||
57 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
58 | if (!rd_host) { |
59 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
60 | return -ENOMEM; |
61 | } | |
62 | ||
63 | rd_host->rd_host_id = host_id; | |
64 | ||
5951146d | 65 | hba->hba_ptr = rd_host; |
c66ac9db | 66 | |
6708bb27 | 67 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
68 | " Generic Target Core Stack %s\n", hba->hba_id, |
69 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
6708bb27 | 70 | pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
e3d6f909 AG |
71 | " MaxSectors: %u\n", hba->hba_id, |
72 | rd_host->rd_host_id, RD_MAX_SECTORS); | |
c66ac9db NB |
73 | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void rd_detach_hba(struct se_hba *hba) | |
78 | { | |
79 | struct rd_host *rd_host = hba->hba_ptr; | |
80 | ||
6708bb27 | 81 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
82 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
83 | ||
84 | kfree(rd_host); | |
85 | hba->hba_ptr = NULL; | |
86 | } | |
87 | ||
88 | /* rd_release_device_space(): | |
89 | * | |
90 | * | |
91 | */ | |
92 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
93 | { | |
94 | u32 i, j, page_count = 0, sg_per_table; | |
95 | struct rd_dev_sg_table *sg_table; | |
96 | struct page *pg; | |
97 | struct scatterlist *sg; | |
98 | ||
99 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
100 | return; | |
101 | ||
102 | sg_table = rd_dev->sg_table_array; | |
103 | ||
104 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
105 | sg = sg_table[i].sg_table; | |
106 | sg_per_table = sg_table[i].rd_sg_count; | |
107 | ||
108 | for (j = 0; j < sg_per_table; j++) { | |
109 | pg = sg_page(&sg[j]); | |
6708bb27 | 110 | if (pg) { |
c66ac9db NB |
111 | __free_page(pg); |
112 | page_count++; | |
113 | } | |
114 | } | |
115 | ||
116 | kfree(sg); | |
117 | } | |
118 | ||
6708bb27 | 119 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
120 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
121 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
122 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
123 | ||
124 | kfree(sg_table); | |
125 | rd_dev->sg_table_array = NULL; | |
126 | rd_dev->sg_table_count = 0; | |
127 | } | |
128 | ||
129 | ||
130 | /* rd_build_device_space(): | |
131 | * | |
132 | * | |
133 | */ | |
134 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
135 | { | |
136 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
137 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
138 | sizeof(struct scatterlist)); | |
139 | struct rd_dev_sg_table *sg_table; | |
140 | struct page *pg; | |
141 | struct scatterlist *sg; | |
142 | ||
143 | if (rd_dev->rd_page_count <= 0) { | |
6708bb27 | 144 | pr_err("Illegal page count: %u for Ramdisk device\n", |
c66ac9db | 145 | rd_dev->rd_page_count); |
065f9716 | 146 | return -EINVAL; |
c66ac9db NB |
147 | } |
148 | total_sg_needed = rd_dev->rd_page_count; | |
149 | ||
150 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
151 | ||
152 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
6708bb27 AG |
153 | if (!sg_table) { |
154 | pr_err("Unable to allocate memory for Ramdisk" | |
c66ac9db | 155 | " scatterlist tables\n"); |
065f9716 | 156 | return -ENOMEM; |
c66ac9db NB |
157 | } |
158 | ||
159 | rd_dev->sg_table_array = sg_table; | |
160 | rd_dev->sg_table_count = sg_tables; | |
161 | ||
162 | while (total_sg_needed) { | |
163 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
164 | max_sg_per_table : total_sg_needed; | |
165 | ||
166 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
167 | GFP_KERNEL); | |
6708bb27 AG |
168 | if (!sg) { |
169 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 170 | " for struct rd_dev\n"); |
065f9716 | 171 | return -ENOMEM; |
c66ac9db NB |
172 | } |
173 | ||
6708bb27 | 174 | sg_init_table(sg, sg_per_table); |
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; | |
191 | } | |
192 | ||
193 | page_offset += sg_per_table; | |
194 | total_sg_needed -= sg_per_table; | |
195 | } | |
196 | ||
6708bb27 | 197 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
c66ac9db NB |
198 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
199 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
200 | rd_dev->sg_table_count); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static void *rd_allocate_virtdevice( | |
206 | struct se_hba *hba, | |
207 | const char *name, | |
208 | int rd_direct) | |
209 | { | |
210 | struct rd_dev *rd_dev; | |
211 | struct rd_host *rd_host = hba->hba_ptr; | |
212 | ||
213 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
214 | if (!rd_dev) { |
215 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
216 | return NULL; |
217 | } | |
218 | ||
219 | rd_dev->rd_host = rd_host; | |
220 | rd_dev->rd_direct = rd_direct; | |
221 | ||
222 | return rd_dev; | |
223 | } | |
224 | ||
c66ac9db NB |
225 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) |
226 | { | |
227 | return rd_allocate_virtdevice(hba, name, 0); | |
228 | } | |
229 | ||
230 | /* rd_create_virtdevice(): | |
231 | * | |
232 | * | |
233 | */ | |
234 | static struct se_device *rd_create_virtdevice( | |
235 | struct se_hba *hba, | |
236 | struct se_subsystem_dev *se_dev, | |
237 | void *p, | |
238 | int rd_direct) | |
239 | { | |
240 | struct se_device *dev; | |
241 | struct se_dev_limits dev_limits; | |
242 | struct rd_dev *rd_dev = p; | |
243 | struct rd_host *rd_host = hba->hba_ptr; | |
065f9716 | 244 | int dev_flags = 0, ret; |
c66ac9db NB |
245 | char prod[16], rev[4]; |
246 | ||
247 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
248 | ||
065f9716 DC |
249 | ret = rd_build_device_space(rd_dev); |
250 | if (ret < 0) | |
c66ac9db NB |
251 | goto fail; |
252 | ||
253 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
254 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
255 | RD_MCP_VERSION); | |
256 | ||
257 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
258 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
259 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
260 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
261 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
262 | ||
263 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 264 | &rd_mcp_template, se_dev, dev_flags, rd_dev, |
c66ac9db | 265 | &dev_limits, prod, rev); |
6708bb27 | 266 | if (!dev) |
c66ac9db NB |
267 | goto fail; |
268 | ||
269 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
270 | rd_dev->rd_queue_depth = dev->queue_depth; | |
271 | ||
6708bb27 | 272 | pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
c66ac9db NB |
273 | " %u pages in %u tables, %lu total bytes\n", |
274 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
275 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
276 | rd_dev->sg_table_count, | |
277 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
278 | ||
279 | return dev; | |
280 | ||
281 | fail: | |
282 | rd_release_device_space(rd_dev); | |
613640e4 | 283 | return ERR_PTR(ret); |
c66ac9db NB |
284 | } |
285 | ||
c66ac9db NB |
286 | static struct se_device *rd_MEMCPY_create_virtdevice( |
287 | struct se_hba *hba, | |
288 | struct se_subsystem_dev *se_dev, | |
289 | void *p) | |
290 | { | |
291 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
292 | } | |
293 | ||
294 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
295 | * | |
296 | * | |
297 | */ | |
298 | static void rd_free_device(void *p) | |
299 | { | |
300 | struct rd_dev *rd_dev = p; | |
301 | ||
302 | rd_release_device_space(rd_dev); | |
303 | kfree(rd_dev); | |
304 | } | |
305 | ||
306 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
307 | { | |
308 | return container_of(task, struct rd_request, rd_task); | |
309 | } | |
310 | ||
311 | static struct se_task * | |
6708bb27 | 312 | rd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
313 | { |
314 | struct rd_request *rd_req; | |
315 | ||
316 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
317 | if (!rd_req) { | |
6708bb27 | 318 | pr_err("Unable to allocate struct rd_request\n"); |
c66ac9db NB |
319 | return NULL; |
320 | } | |
c66ac9db NB |
321 | |
322 | return &rd_req->rd_task; | |
323 | } | |
324 | ||
325 | /* rd_get_sg_table(): | |
326 | * | |
327 | * | |
328 | */ | |
329 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
330 | { | |
331 | u32 i; | |
332 | struct rd_dev_sg_table *sg_table; | |
333 | ||
334 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
335 | sg_table = &rd_dev->sg_table_array[i]; | |
336 | if ((sg_table->page_start_offset <= page) && | |
337 | (sg_table->page_end_offset >= page)) | |
338 | return sg_table; | |
339 | } | |
340 | ||
6708bb27 | 341 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
342 | page); |
343 | ||
344 | return NULL; | |
345 | } | |
346 | ||
347 | /* rd_MEMCPY_read(): | |
348 | * | |
349 | * | |
350 | */ | |
351 | static int rd_MEMCPY_read(struct rd_request *req) | |
352 | { | |
353 | struct se_task *task = &req->rd_task; | |
6708bb27 | 354 | struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; |
c66ac9db NB |
355 | struct rd_dev_sg_table *table; |
356 | struct scatterlist *sg_d, *sg_s; | |
357 | void *dst, *src; | |
358 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
359 | u32 length, page_end = 0, table_sg_end; | |
360 | u32 rd_offset = req->rd_offset; | |
361 | ||
362 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 363 | if (!table) |
e3d6f909 | 364 | return -EINVAL; |
c66ac9db NB |
365 | |
366 | table_sg_end = (table->page_end_offset - req->rd_page); | |
367 | sg_d = task->task_sg; | |
368 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
6708bb27 AG |
369 | |
370 | pr_debug("RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" | |
c66ac9db NB |
371 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
372 | req->rd_page, req->rd_offset); | |
6708bb27 | 373 | |
c66ac9db NB |
374 | src_offset = rd_offset; |
375 | ||
376 | while (req->rd_size) { | |
377 | if ((sg_d[i].length - dst_offset) < | |
378 | (sg_s[j].length - src_offset)) { | |
379 | length = (sg_d[i].length - dst_offset); | |
6708bb27 AG |
380 | |
381 | pr_debug("Step 1 - sg_d[%d]: %p length: %d" | |
c66ac9db NB |
382 | " offset: %u sg_s[%d].length: %u\n", i, |
383 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, | |
384 | sg_s[j].length); | |
6708bb27 | 385 | pr_debug("Step 1 - length: %u dst_offset: %u" |
c66ac9db NB |
386 | " src_offset: %u\n", length, dst_offset, |
387 | src_offset); | |
6708bb27 | 388 | |
c66ac9db NB |
389 | if (length > req->rd_size) |
390 | length = req->rd_size; | |
391 | ||
392 | dst = sg_virt(&sg_d[i++]) + dst_offset; | |
6fc61488 | 393 | BUG_ON(!dst); |
c66ac9db NB |
394 | |
395 | src = sg_virt(&sg_s[j]) + src_offset; | |
6fc61488 | 396 | BUG_ON(!src); |
c66ac9db NB |
397 | |
398 | dst_offset = 0; | |
399 | src_offset = length; | |
400 | page_end = 0; | |
401 | } else { | |
402 | length = (sg_s[j].length - src_offset); | |
6708bb27 AG |
403 | |
404 | pr_debug("Step 2 - sg_d[%d]: %p length: %d" | |
c66ac9db NB |
405 | " offset: %u sg_s[%d].length: %u\n", i, |
406 | &sg_d[i], sg_d[i].length, sg_d[i].offset, | |
407 | j, sg_s[j].length); | |
6708bb27 | 408 | pr_debug("Step 2 - length: %u dst_offset: %u" |
c66ac9db NB |
409 | " src_offset: %u\n", length, dst_offset, |
410 | src_offset); | |
6708bb27 | 411 | |
c66ac9db NB |
412 | if (length > req->rd_size) |
413 | length = req->rd_size; | |
414 | ||
415 | dst = sg_virt(&sg_d[i]) + dst_offset; | |
6fc61488 | 416 | BUG_ON(!dst); |
c66ac9db NB |
417 | |
418 | if (sg_d[i].length == length) { | |
419 | i++; | |
420 | dst_offset = 0; | |
421 | } else | |
422 | dst_offset = length; | |
423 | ||
424 | src = sg_virt(&sg_s[j++]) + src_offset; | |
6fc61488 | 425 | BUG_ON(!src); |
c66ac9db NB |
426 | |
427 | src_offset = 0; | |
428 | page_end = 1; | |
429 | } | |
430 | ||
431 | memcpy(dst, src, length); | |
432 | ||
6708bb27 | 433 | pr_debug("page: %u, remaining size: %u, length: %u," |
c66ac9db NB |
434 | " i: %u, j: %u\n", req->rd_page, |
435 | (req->rd_size - length), length, i, j); | |
6708bb27 | 436 | |
c66ac9db | 437 | req->rd_size -= length; |
6708bb27 | 438 | if (!req->rd_size) |
c66ac9db NB |
439 | return 0; |
440 | ||
441 | if (!page_end) | |
442 | continue; | |
443 | ||
444 | if (++req->rd_page <= table->page_end_offset) { | |
6708bb27 | 445 | pr_debug("page: %u in same page table\n", |
c66ac9db | 446 | req->rd_page); |
c66ac9db NB |
447 | continue; |
448 | } | |
6708bb27 AG |
449 | |
450 | pr_debug("getting new page table for page: %u\n", | |
c66ac9db | 451 | req->rd_page); |
6708bb27 | 452 | |
c66ac9db | 453 | table = rd_get_sg_table(dev, req->rd_page); |
6708bb27 | 454 | if (!table) |
e3d6f909 | 455 | return -EINVAL; |
c66ac9db NB |
456 | |
457 | sg_s = &table->sg_table[j = 0]; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | /* rd_MEMCPY_write(): | |
464 | * | |
465 | * | |
466 | */ | |
467 | static int rd_MEMCPY_write(struct rd_request *req) | |
468 | { | |
469 | struct se_task *task = &req->rd_task; | |
6708bb27 | 470 | struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; |
c66ac9db NB |
471 | struct rd_dev_sg_table *table; |
472 | struct scatterlist *sg_d, *sg_s; | |
473 | void *dst, *src; | |
474 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
475 | u32 length, page_end = 0, table_sg_end; | |
476 | u32 rd_offset = req->rd_offset; | |
477 | ||
478 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 479 | if (!table) |
e3d6f909 | 480 | return -EINVAL; |
c66ac9db NB |
481 | |
482 | table_sg_end = (table->page_end_offset - req->rd_page); | |
483 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; | |
484 | sg_s = task->task_sg; | |
6708bb27 AG |
485 | |
486 | pr_debug("RD[%d] Write LBA: %llu, Size: %u, Page: %u," | |
c66ac9db NB |
487 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
488 | req->rd_page, req->rd_offset); | |
6708bb27 | 489 | |
c66ac9db NB |
490 | dst_offset = rd_offset; |
491 | ||
492 | while (req->rd_size) { | |
493 | if ((sg_s[i].length - src_offset) < | |
494 | (sg_d[j].length - dst_offset)) { | |
495 | length = (sg_s[i].length - src_offset); | |
6708bb27 AG |
496 | |
497 | pr_debug("Step 1 - sg_s[%d]: %p length: %d" | |
c66ac9db NB |
498 | " offset: %d sg_d[%d].length: %u\n", i, |
499 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
500 | j, sg_d[j].length); | |
6708bb27 | 501 | pr_debug("Step 1 - length: %u src_offset: %u" |
c66ac9db NB |
502 | " dst_offset: %u\n", length, src_offset, |
503 | dst_offset); | |
6708bb27 | 504 | |
c66ac9db NB |
505 | if (length > req->rd_size) |
506 | length = req->rd_size; | |
507 | ||
508 | src = sg_virt(&sg_s[i++]) + src_offset; | |
6fc61488 | 509 | BUG_ON(!src); |
c66ac9db NB |
510 | |
511 | dst = sg_virt(&sg_d[j]) + dst_offset; | |
6fc61488 | 512 | BUG_ON(!dst); |
c66ac9db NB |
513 | |
514 | src_offset = 0; | |
515 | dst_offset = length; | |
516 | page_end = 0; | |
517 | } else { | |
518 | length = (sg_d[j].length - dst_offset); | |
6708bb27 AG |
519 | |
520 | pr_debug("Step 2 - sg_s[%d]: %p length: %d" | |
c66ac9db NB |
521 | " offset: %d sg_d[%d].length: %u\n", i, |
522 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
523 | j, sg_d[j].length); | |
6708bb27 | 524 | pr_debug("Step 2 - length: %u src_offset: %u" |
c66ac9db NB |
525 | " dst_offset: %u\n", length, src_offset, |
526 | dst_offset); | |
6708bb27 | 527 | |
c66ac9db NB |
528 | if (length > req->rd_size) |
529 | length = req->rd_size; | |
530 | ||
531 | src = sg_virt(&sg_s[i]) + src_offset; | |
6fc61488 | 532 | BUG_ON(!src); |
c66ac9db NB |
533 | |
534 | if (sg_s[i].length == length) { | |
535 | i++; | |
536 | src_offset = 0; | |
537 | } else | |
538 | src_offset = length; | |
539 | ||
540 | dst = sg_virt(&sg_d[j++]) + dst_offset; | |
6fc61488 | 541 | BUG_ON(!dst); |
c66ac9db NB |
542 | |
543 | dst_offset = 0; | |
544 | page_end = 1; | |
545 | } | |
546 | ||
547 | memcpy(dst, src, length); | |
548 | ||
6708bb27 | 549 | pr_debug("page: %u, remaining size: %u, length: %u," |
c66ac9db NB |
550 | " i: %u, j: %u\n", req->rd_page, |
551 | (req->rd_size - length), length, i, j); | |
6708bb27 | 552 | |
c66ac9db | 553 | req->rd_size -= length; |
6708bb27 | 554 | if (!req->rd_size) |
c66ac9db NB |
555 | return 0; |
556 | ||
557 | if (!page_end) | |
558 | continue; | |
559 | ||
560 | if (++req->rd_page <= table->page_end_offset) { | |
6708bb27 | 561 | pr_debug("page: %u in same page table\n", |
c66ac9db | 562 | req->rd_page); |
c66ac9db NB |
563 | continue; |
564 | } | |
6708bb27 AG |
565 | |
566 | pr_debug("getting new page table for page: %u\n", | |
c66ac9db | 567 | req->rd_page); |
6708bb27 | 568 | |
c66ac9db | 569 | table = rd_get_sg_table(dev, req->rd_page); |
6708bb27 | 570 | if (!table) |
e3d6f909 | 571 | return -EINVAL; |
c66ac9db NB |
572 | |
573 | sg_d = &table->sg_table[j = 0]; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
580 | * | |
581 | * | |
582 | */ | |
583 | static int rd_MEMCPY_do_task(struct se_task *task) | |
584 | { | |
585 | struct se_device *dev = task->se_dev; | |
586 | struct rd_request *req = RD_REQ(task); | |
587 | unsigned long long lba; | |
588 | int ret; | |
589 | ||
e3d6f909 | 590 | req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE; |
c66ac9db NB |
591 | lba = task->task_lba; |
592 | req->rd_offset = (do_div(lba, | |
e3d6f909 AG |
593 | (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) * |
594 | dev->se_sub_dev->se_dev_attrib.block_size; | |
c66ac9db NB |
595 | req->rd_size = task->task_size; |
596 | ||
597 | if (task->task_data_direction == DMA_FROM_DEVICE) | |
598 | ret = rd_MEMCPY_read(req); | |
599 | else | |
600 | ret = rd_MEMCPY_write(req); | |
601 | ||
602 | if (ret != 0) | |
603 | return ret; | |
604 | ||
605 | task->task_scsi_status = GOOD; | |
606 | transport_complete_task(task, 1); | |
607 | ||
608 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
609 | } | |
610 | ||
c66ac9db NB |
611 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
612 | * | |
613 | * | |
614 | */ | |
615 | static void rd_free_task(struct se_task *task) | |
616 | { | |
617 | kfree(RD_REQ(task)); | |
618 | } | |
619 | ||
620 | enum { | |
621 | Opt_rd_pages, Opt_err | |
622 | }; | |
623 | ||
624 | static match_table_t tokens = { | |
625 | {Opt_rd_pages, "rd_pages=%d"}, | |
626 | {Opt_err, NULL} | |
627 | }; | |
628 | ||
629 | static ssize_t rd_set_configfs_dev_params( | |
630 | struct se_hba *hba, | |
631 | struct se_subsystem_dev *se_dev, | |
632 | const char *page, | |
633 | ssize_t count) | |
634 | { | |
635 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
636 | char *orig, *ptr, *opts; | |
637 | substring_t args[MAX_OPT_ARGS]; | |
638 | int ret = 0, arg, token; | |
639 | ||
640 | opts = kstrdup(page, GFP_KERNEL); | |
641 | if (!opts) | |
642 | return -ENOMEM; | |
643 | ||
644 | orig = opts; | |
645 | ||
646 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
647 | if (!*ptr) | |
648 | continue; | |
649 | ||
650 | token = match_token(ptr, tokens, args); | |
651 | switch (token) { | |
652 | case Opt_rd_pages: | |
653 | match_int(args, &arg); | |
654 | rd_dev->rd_page_count = arg; | |
6708bb27 | 655 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
656 | " Count: %u\n", rd_dev->rd_page_count); |
657 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
658 | break; | |
659 | default: | |
660 | break; | |
661 | } | |
662 | } | |
663 | ||
664 | kfree(orig); | |
665 | return (!ret) ? count : ret; | |
666 | } | |
667 | ||
668 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
669 | { | |
670 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
671 | ||
672 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
6708bb27 | 673 | pr_debug("Missing rd_pages= parameter\n"); |
e3d6f909 | 674 | return -EINVAL; |
c66ac9db NB |
675 | } |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | static ssize_t rd_show_configfs_dev_params( | |
681 | struct se_hba *hba, | |
682 | struct se_subsystem_dev *se_dev, | |
683 | char *b) | |
684 | { | |
685 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
686 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
687 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
688 | "rd_direct" : "rd_mcp"); | |
689 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
690 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
691 | PAGE_SIZE, rd_dev->sg_table_count); | |
692 | return bl; | |
693 | } | |
694 | ||
695 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) | |
696 | * | |
697 | * | |
698 | */ | |
699 | static unsigned char *rd_get_cdb(struct se_task *task) | |
700 | { | |
701 | struct rd_request *req = RD_REQ(task); | |
702 | ||
703 | return req->rd_scsi_cdb; | |
704 | } | |
705 | ||
706 | static u32 rd_get_device_rev(struct se_device *dev) | |
707 | { | |
708 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
709 | } | |
710 | ||
711 | static u32 rd_get_device_type(struct se_device *dev) | |
712 | { | |
713 | return TYPE_DISK; | |
714 | } | |
715 | ||
716 | static sector_t rd_get_blocks(struct se_device *dev) | |
717 | { | |
718 | struct rd_dev *rd_dev = dev->dev_ptr; | |
719 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
e3d6f909 | 720 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
c66ac9db NB |
721 | |
722 | return blocks_long; | |
723 | } | |
724 | ||
c66ac9db NB |
725 | static struct se_subsystem_api rd_mcp_template = { |
726 | .name = "rd_mcp", | |
727 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
728 | .attach_hba = rd_attach_hba, | |
729 | .detach_hba = rd_detach_hba, | |
730 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
731 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
732 | .free_device = rd_free_device, | |
733 | .alloc_task = rd_alloc_task, | |
734 | .do_task = rd_MEMCPY_do_task, | |
735 | .free_task = rd_free_task, | |
736 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
737 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
738 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
739 | .get_cdb = rd_get_cdb, | |
740 | .get_device_rev = rd_get_device_rev, | |
741 | .get_device_type = rd_get_device_type, | |
742 | .get_blocks = rd_get_blocks, | |
743 | }; | |
744 | ||
745 | int __init rd_module_init(void) | |
746 | { | |
747 | int ret; | |
748 | ||
c66ac9db NB |
749 | ret = transport_subsystem_register(&rd_mcp_template); |
750 | if (ret < 0) { | |
c66ac9db NB |
751 | return ret; |
752 | } | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | void rd_module_exit(void) | |
758 | { | |
c66ac9db NB |
759 | transport_subsystem_release(&rd_mcp_template); |
760 | } |