Commit | Line | Data |
---|---|---|
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 | ||
c66ac9db NB |
30 | #include <linux/string.h> |
31 | #include <linux/parser.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/blkdev.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_host.h> | |
38 | ||
39 | #include <target/target_core_base.h> | |
40 | #include <target/target_core_device.h> | |
41 | #include <target/target_core_transport.h> | |
42 | #include <target/target_core_fabric_ops.h> | |
43 | ||
44 | #include "target_core_rd.h" | |
45 | ||
c66ac9db NB |
46 | static struct se_subsystem_api rd_mcp_template; |
47 | ||
c66ac9db NB |
48 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
49 | * | |
50 | * | |
51 | */ | |
52 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
53 | { | |
54 | struct rd_host *rd_host; | |
55 | ||
56 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
57 | if (!rd_host) { |
58 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
59 | return -ENOMEM; |
60 | } | |
61 | ||
62 | rd_host->rd_host_id = host_id; | |
63 | ||
5951146d | 64 | hba->hba_ptr = rd_host; |
c66ac9db | 65 | |
6708bb27 | 66 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
67 | " Generic Target Core Stack %s\n", hba->hba_id, |
68 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
6708bb27 | 69 | pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
e3d6f909 AG |
70 | " MaxSectors: %u\n", hba->hba_id, |
71 | rd_host->rd_host_id, RD_MAX_SECTORS); | |
c66ac9db NB |
72 | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static void rd_detach_hba(struct se_hba *hba) | |
77 | { | |
78 | struct rd_host *rd_host = hba->hba_ptr; | |
79 | ||
6708bb27 | 80 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
81 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
82 | ||
83 | kfree(rd_host); | |
84 | hba->hba_ptr = NULL; | |
85 | } | |
86 | ||
87 | /* rd_release_device_space(): | |
88 | * | |
89 | * | |
90 | */ | |
91 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
92 | { | |
93 | u32 i, j, page_count = 0, sg_per_table; | |
94 | struct rd_dev_sg_table *sg_table; | |
95 | struct page *pg; | |
96 | struct scatterlist *sg; | |
97 | ||
98 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
99 | return; | |
100 | ||
101 | sg_table = rd_dev->sg_table_array; | |
102 | ||
103 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
104 | sg = sg_table[i].sg_table; | |
105 | sg_per_table = sg_table[i].rd_sg_count; | |
106 | ||
107 | for (j = 0; j < sg_per_table; j++) { | |
108 | pg = sg_page(&sg[j]); | |
6708bb27 | 109 | if (pg) { |
c66ac9db NB |
110 | __free_page(pg); |
111 | page_count++; | |
112 | } | |
113 | } | |
114 | ||
115 | kfree(sg); | |
116 | } | |
117 | ||
6708bb27 | 118 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
119 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
120 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
121 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
122 | ||
123 | kfree(sg_table); | |
124 | rd_dev->sg_table_array = NULL; | |
125 | rd_dev->sg_table_count = 0; | |
126 | } | |
127 | ||
128 | ||
129 | /* rd_build_device_space(): | |
130 | * | |
131 | * | |
132 | */ | |
133 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
134 | { | |
135 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
136 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
137 | sizeof(struct scatterlist)); | |
138 | struct rd_dev_sg_table *sg_table; | |
139 | struct page *pg; | |
140 | struct scatterlist *sg; | |
141 | ||
142 | if (rd_dev->rd_page_count <= 0) { | |
6708bb27 | 143 | pr_err("Illegal page count: %u for Ramdisk device\n", |
c66ac9db | 144 | rd_dev->rd_page_count); |
065f9716 | 145 | return -EINVAL; |
c66ac9db NB |
146 | } |
147 | total_sg_needed = rd_dev->rd_page_count; | |
148 | ||
149 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
150 | ||
151 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
6708bb27 AG |
152 | if (!sg_table) { |
153 | pr_err("Unable to allocate memory for Ramdisk" | |
c66ac9db | 154 | " scatterlist tables\n"); |
065f9716 | 155 | return -ENOMEM; |
c66ac9db NB |
156 | } |
157 | ||
158 | rd_dev->sg_table_array = sg_table; | |
159 | rd_dev->sg_table_count = sg_tables; | |
160 | ||
161 | while (total_sg_needed) { | |
162 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
163 | max_sg_per_table : total_sg_needed; | |
164 | ||
165 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
166 | GFP_KERNEL); | |
6708bb27 AG |
167 | if (!sg) { |
168 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 169 | " for struct rd_dev\n"); |
065f9716 | 170 | return -ENOMEM; |
c66ac9db NB |
171 | } |
172 | ||
6708bb27 | 173 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
174 | |
175 | sg_table[i].sg_table = sg; | |
176 | sg_table[i].rd_sg_count = sg_per_table; | |
177 | sg_table[i].page_start_offset = page_offset; | |
178 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
179 | - 1; | |
180 | ||
181 | for (j = 0; j < sg_per_table; j++) { | |
182 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
183 | if (!pg) { |
184 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 185 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 186 | return -ENOMEM; |
c66ac9db NB |
187 | } |
188 | sg_assign_page(&sg[j], pg); | |
189 | sg[j].length = PAGE_SIZE; | |
190 | } | |
191 | ||
192 | page_offset += sg_per_table; | |
193 | total_sg_needed -= sg_per_table; | |
194 | } | |
195 | ||
6708bb27 | 196 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
c66ac9db NB |
197 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
198 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
199 | rd_dev->sg_table_count); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static void *rd_allocate_virtdevice( | |
205 | struct se_hba *hba, | |
206 | const char *name, | |
207 | int rd_direct) | |
208 | { | |
209 | struct rd_dev *rd_dev; | |
210 | struct rd_host *rd_host = hba->hba_ptr; | |
211 | ||
212 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
213 | if (!rd_dev) { |
214 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
215 | return NULL; |
216 | } | |
217 | ||
218 | rd_dev->rd_host = rd_host; | |
219 | rd_dev->rd_direct = rd_direct; | |
220 | ||
221 | return rd_dev; | |
222 | } | |
223 | ||
c66ac9db NB |
224 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) |
225 | { | |
226 | return rd_allocate_virtdevice(hba, name, 0); | |
227 | } | |
228 | ||
229 | /* rd_create_virtdevice(): | |
230 | * | |
231 | * | |
232 | */ | |
233 | static struct se_device *rd_create_virtdevice( | |
234 | struct se_hba *hba, | |
235 | struct se_subsystem_dev *se_dev, | |
236 | void *p, | |
237 | int rd_direct) | |
238 | { | |
239 | struct se_device *dev; | |
240 | struct se_dev_limits dev_limits; | |
241 | struct rd_dev *rd_dev = p; | |
242 | struct rd_host *rd_host = hba->hba_ptr; | |
065f9716 | 243 | int dev_flags = 0, ret; |
c66ac9db NB |
244 | char prod[16], rev[4]; |
245 | ||
246 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
247 | ||
065f9716 DC |
248 | ret = rd_build_device_space(rd_dev); |
249 | if (ret < 0) | |
c66ac9db NB |
250 | goto fail; |
251 | ||
252 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
253 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
254 | RD_MCP_VERSION); | |
255 | ||
256 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
257 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
258 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
259 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
260 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
261 | ||
262 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 263 | &rd_mcp_template, se_dev, dev_flags, rd_dev, |
c66ac9db | 264 | &dev_limits, prod, rev); |
6708bb27 | 265 | if (!dev) |
c66ac9db NB |
266 | goto fail; |
267 | ||
268 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
269 | rd_dev->rd_queue_depth = dev->queue_depth; | |
270 | ||
6708bb27 | 271 | pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
c66ac9db NB |
272 | " %u pages in %u tables, %lu total bytes\n", |
273 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
274 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
275 | rd_dev->sg_table_count, | |
276 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
277 | ||
278 | return dev; | |
279 | ||
280 | fail: | |
281 | rd_release_device_space(rd_dev); | |
613640e4 | 282 | return ERR_PTR(ret); |
c66ac9db NB |
283 | } |
284 | ||
c66ac9db NB |
285 | static struct se_device *rd_MEMCPY_create_virtdevice( |
286 | struct se_hba *hba, | |
287 | struct se_subsystem_dev *se_dev, | |
288 | void *p) | |
289 | { | |
290 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
291 | } | |
292 | ||
293 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
294 | * | |
295 | * | |
296 | */ | |
297 | static void rd_free_device(void *p) | |
298 | { | |
299 | struct rd_dev *rd_dev = p; | |
300 | ||
301 | rd_release_device_space(rd_dev); | |
302 | kfree(rd_dev); | |
303 | } | |
304 | ||
305 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
306 | { | |
307 | return container_of(task, struct rd_request, rd_task); | |
308 | } | |
309 | ||
310 | static struct se_task * | |
6708bb27 | 311 | rd_alloc_task(unsigned char *cdb) |
c66ac9db NB |
312 | { |
313 | struct rd_request *rd_req; | |
314 | ||
315 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
316 | if (!rd_req) { | |
6708bb27 | 317 | pr_err("Unable to allocate struct rd_request\n"); |
c66ac9db NB |
318 | return NULL; |
319 | } | |
c66ac9db NB |
320 | |
321 | return &rd_req->rd_task; | |
322 | } | |
323 | ||
324 | /* rd_get_sg_table(): | |
325 | * | |
326 | * | |
327 | */ | |
328 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
329 | { | |
330 | u32 i; | |
331 | struct rd_dev_sg_table *sg_table; | |
332 | ||
333 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
334 | sg_table = &rd_dev->sg_table_array[i]; | |
335 | if ((sg_table->page_start_offset <= page) && | |
336 | (sg_table->page_end_offset >= page)) | |
337 | return sg_table; | |
338 | } | |
339 | ||
6708bb27 | 340 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
341 | page); |
342 | ||
343 | return NULL; | |
344 | } | |
345 | ||
346 | /* rd_MEMCPY_read(): | |
347 | * | |
348 | * | |
349 | */ | |
350 | static int rd_MEMCPY_read(struct rd_request *req) | |
351 | { | |
352 | struct se_task *task = &req->rd_task; | |
42bf829e | 353 | struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr; |
c66ac9db NB |
354 | struct rd_dev_sg_table *table; |
355 | struct scatterlist *sg_d, *sg_s; | |
356 | void *dst, *src; | |
357 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
358 | u32 length, page_end = 0, table_sg_end; | |
359 | u32 rd_offset = req->rd_offset; | |
360 | ||
361 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 362 | if (!table) |
e3d6f909 | 363 | return -EINVAL; |
c66ac9db NB |
364 | |
365 | table_sg_end = (table->page_end_offset - req->rd_page); | |
366 | sg_d = task->task_sg; | |
367 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
6708bb27 AG |
368 | |
369 | pr_debug("RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" | |
c66ac9db NB |
370 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
371 | req->rd_page, req->rd_offset); | |
6708bb27 | 372 | |
c66ac9db NB |
373 | src_offset = rd_offset; |
374 | ||
375 | while (req->rd_size) { | |
376 | if ((sg_d[i].length - dst_offset) < | |
377 | (sg_s[j].length - src_offset)) { | |
378 | length = (sg_d[i].length - dst_offset); | |
6708bb27 AG |
379 | |
380 | pr_debug("Step 1 - sg_d[%d]: %p length: %d" | |
c66ac9db NB |
381 | " offset: %u sg_s[%d].length: %u\n", i, |
382 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, | |
383 | sg_s[j].length); | |
6708bb27 | 384 | pr_debug("Step 1 - length: %u dst_offset: %u" |
c66ac9db NB |
385 | " src_offset: %u\n", length, dst_offset, |
386 | src_offset); | |
6708bb27 | 387 | |
c66ac9db NB |
388 | if (length > req->rd_size) |
389 | length = req->rd_size; | |
390 | ||
391 | dst = sg_virt(&sg_d[i++]) + dst_offset; | |
6fc61488 | 392 | BUG_ON(!dst); |
c66ac9db NB |
393 | |
394 | src = sg_virt(&sg_s[j]) + src_offset; | |
6fc61488 | 395 | BUG_ON(!src); |
c66ac9db NB |
396 | |
397 | dst_offset = 0; | |
398 | src_offset = length; | |
399 | page_end = 0; | |
400 | } else { | |
401 | length = (sg_s[j].length - src_offset); | |
6708bb27 AG |
402 | |
403 | pr_debug("Step 2 - sg_d[%d]: %p length: %d" | |
c66ac9db NB |
404 | " offset: %u sg_s[%d].length: %u\n", i, |
405 | &sg_d[i], sg_d[i].length, sg_d[i].offset, | |
406 | j, sg_s[j].length); | |
6708bb27 | 407 | pr_debug("Step 2 - length: %u dst_offset: %u" |
c66ac9db NB |
408 | " src_offset: %u\n", length, dst_offset, |
409 | src_offset); | |
6708bb27 | 410 | |
c66ac9db NB |
411 | if (length > req->rd_size) |
412 | length = req->rd_size; | |
413 | ||
414 | dst = sg_virt(&sg_d[i]) + dst_offset; | |
6fc61488 | 415 | BUG_ON(!dst); |
c66ac9db NB |
416 | |
417 | if (sg_d[i].length == length) { | |
418 | i++; | |
419 | dst_offset = 0; | |
420 | } else | |
421 | dst_offset = length; | |
422 | ||
423 | src = sg_virt(&sg_s[j++]) + src_offset; | |
6fc61488 | 424 | BUG_ON(!src); |
c66ac9db NB |
425 | |
426 | src_offset = 0; | |
427 | page_end = 1; | |
428 | } | |
429 | ||
430 | memcpy(dst, src, length); | |
431 | ||
6708bb27 | 432 | pr_debug("page: %u, remaining size: %u, length: %u," |
c66ac9db NB |
433 | " i: %u, j: %u\n", req->rd_page, |
434 | (req->rd_size - length), length, i, j); | |
6708bb27 | 435 | |
c66ac9db | 436 | req->rd_size -= length; |
6708bb27 | 437 | if (!req->rd_size) |
c66ac9db NB |
438 | return 0; |
439 | ||
440 | if (!page_end) | |
441 | continue; | |
442 | ||
443 | if (++req->rd_page <= table->page_end_offset) { | |
6708bb27 | 444 | pr_debug("page: %u in same page table\n", |
c66ac9db | 445 | req->rd_page); |
c66ac9db NB |
446 | continue; |
447 | } | |
6708bb27 AG |
448 | |
449 | pr_debug("getting new page table for page: %u\n", | |
c66ac9db | 450 | req->rd_page); |
6708bb27 | 451 | |
c66ac9db | 452 | table = rd_get_sg_table(dev, req->rd_page); |
6708bb27 | 453 | if (!table) |
e3d6f909 | 454 | return -EINVAL; |
c66ac9db NB |
455 | |
456 | sg_s = &table->sg_table[j = 0]; | |
457 | } | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | /* rd_MEMCPY_write(): | |
463 | * | |
464 | * | |
465 | */ | |
466 | static int rd_MEMCPY_write(struct rd_request *req) | |
467 | { | |
468 | struct se_task *task = &req->rd_task; | |
42bf829e | 469 | struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr; |
c66ac9db NB |
470 | struct rd_dev_sg_table *table; |
471 | struct scatterlist *sg_d, *sg_s; | |
472 | void *dst, *src; | |
473 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
474 | u32 length, page_end = 0, table_sg_end; | |
475 | u32 rd_offset = req->rd_offset; | |
476 | ||
477 | table = rd_get_sg_table(dev, req->rd_page); | |
6708bb27 | 478 | if (!table) |
e3d6f909 | 479 | return -EINVAL; |
c66ac9db NB |
480 | |
481 | table_sg_end = (table->page_end_offset - req->rd_page); | |
482 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; | |
483 | sg_s = task->task_sg; | |
6708bb27 AG |
484 | |
485 | pr_debug("RD[%d] Write LBA: %llu, Size: %u, Page: %u," | |
c66ac9db NB |
486 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
487 | req->rd_page, req->rd_offset); | |
6708bb27 | 488 | |
c66ac9db NB |
489 | dst_offset = rd_offset; |
490 | ||
491 | while (req->rd_size) { | |
492 | if ((sg_s[i].length - src_offset) < | |
493 | (sg_d[j].length - dst_offset)) { | |
494 | length = (sg_s[i].length - src_offset); | |
6708bb27 AG |
495 | |
496 | pr_debug("Step 1 - sg_s[%d]: %p length: %d" | |
c66ac9db NB |
497 | " offset: %d sg_d[%d].length: %u\n", i, |
498 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
499 | j, sg_d[j].length); | |
6708bb27 | 500 | pr_debug("Step 1 - length: %u src_offset: %u" |
c66ac9db NB |
501 | " dst_offset: %u\n", length, src_offset, |
502 | dst_offset); | |
6708bb27 | 503 | |
c66ac9db NB |
504 | if (length > req->rd_size) |
505 | length = req->rd_size; | |
506 | ||
507 | src = sg_virt(&sg_s[i++]) + src_offset; | |
6fc61488 | 508 | BUG_ON(!src); |
c66ac9db NB |
509 | |
510 | dst = sg_virt(&sg_d[j]) + dst_offset; | |
6fc61488 | 511 | BUG_ON(!dst); |
c66ac9db NB |
512 | |
513 | src_offset = 0; | |
514 | dst_offset = length; | |
515 | page_end = 0; | |
516 | } else { | |
517 | length = (sg_d[j].length - dst_offset); | |
6708bb27 AG |
518 | |
519 | pr_debug("Step 2 - sg_s[%d]: %p length: %d" | |
c66ac9db NB |
520 | " offset: %d sg_d[%d].length: %u\n", i, |
521 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
522 | j, sg_d[j].length); | |
6708bb27 | 523 | pr_debug("Step 2 - length: %u src_offset: %u" |
c66ac9db NB |
524 | " dst_offset: %u\n", length, src_offset, |
525 | dst_offset); | |
6708bb27 | 526 | |
c66ac9db NB |
527 | if (length > req->rd_size) |
528 | length = req->rd_size; | |
529 | ||
530 | src = sg_virt(&sg_s[i]) + src_offset; | |
6fc61488 | 531 | BUG_ON(!src); |
c66ac9db NB |
532 | |
533 | if (sg_s[i].length == length) { | |
534 | i++; | |
535 | src_offset = 0; | |
536 | } else | |
537 | src_offset = length; | |
538 | ||
539 | dst = sg_virt(&sg_d[j++]) + dst_offset; | |
6fc61488 | 540 | BUG_ON(!dst); |
c66ac9db NB |
541 | |
542 | dst_offset = 0; | |
543 | page_end = 1; | |
544 | } | |
545 | ||
546 | memcpy(dst, src, length); | |
547 | ||
6708bb27 | 548 | pr_debug("page: %u, remaining size: %u, length: %u," |
c66ac9db NB |
549 | " i: %u, j: %u\n", req->rd_page, |
550 | (req->rd_size - length), length, i, j); | |
6708bb27 | 551 | |
c66ac9db | 552 | req->rd_size -= length; |
6708bb27 | 553 | if (!req->rd_size) |
c66ac9db NB |
554 | return 0; |
555 | ||
556 | if (!page_end) | |
557 | continue; | |
558 | ||
559 | if (++req->rd_page <= table->page_end_offset) { | |
6708bb27 | 560 | pr_debug("page: %u in same page table\n", |
c66ac9db | 561 | req->rd_page); |
c66ac9db NB |
562 | continue; |
563 | } | |
6708bb27 AG |
564 | |
565 | pr_debug("getting new page table for page: %u\n", | |
c66ac9db | 566 | req->rd_page); |
6708bb27 | 567 | |
c66ac9db | 568 | table = rd_get_sg_table(dev, req->rd_page); |
6708bb27 | 569 | if (!table) |
e3d6f909 | 570 | return -EINVAL; |
c66ac9db NB |
571 | |
572 | sg_d = &table->sg_table[j = 0]; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
579 | * | |
580 | * | |
581 | */ | |
582 | static int rd_MEMCPY_do_task(struct se_task *task) | |
583 | { | |
42bf829e | 584 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db NB |
585 | struct rd_request *req = RD_REQ(task); |
586 | unsigned long long lba; | |
587 | int ret; | |
588 | ||
e3d6f909 | 589 | req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE; |
c66ac9db NB |
590 | lba = task->task_lba; |
591 | req->rd_offset = (do_div(lba, | |
e3d6f909 AG |
592 | (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) * |
593 | dev->se_sub_dev->se_dev_attrib.block_size; | |
c66ac9db NB |
594 | req->rd_size = task->task_size; |
595 | ||
596 | if (task->task_data_direction == DMA_FROM_DEVICE) | |
597 | ret = rd_MEMCPY_read(req); | |
598 | else | |
599 | ret = rd_MEMCPY_write(req); | |
600 | ||
601 | if (ret != 0) | |
602 | return ret; | |
603 | ||
604 | task->task_scsi_status = GOOD; | |
605 | transport_complete_task(task, 1); | |
606 | ||
607 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
608 | } | |
609 | ||
c66ac9db NB |
610 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
611 | * | |
612 | * | |
613 | */ | |
614 | static void rd_free_task(struct se_task *task) | |
615 | { | |
616 | kfree(RD_REQ(task)); | |
617 | } | |
618 | ||
619 | enum { | |
620 | Opt_rd_pages, Opt_err | |
621 | }; | |
622 | ||
623 | static match_table_t tokens = { | |
624 | {Opt_rd_pages, "rd_pages=%d"}, | |
625 | {Opt_err, NULL} | |
626 | }; | |
627 | ||
628 | static ssize_t rd_set_configfs_dev_params( | |
629 | struct se_hba *hba, | |
630 | struct se_subsystem_dev *se_dev, | |
631 | const char *page, | |
632 | ssize_t count) | |
633 | { | |
634 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
635 | char *orig, *ptr, *opts; | |
636 | substring_t args[MAX_OPT_ARGS]; | |
637 | int ret = 0, arg, token; | |
638 | ||
639 | opts = kstrdup(page, GFP_KERNEL); | |
640 | if (!opts) | |
641 | return -ENOMEM; | |
642 | ||
643 | orig = opts; | |
644 | ||
645 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
646 | if (!*ptr) | |
647 | continue; | |
648 | ||
649 | token = match_token(ptr, tokens, args); | |
650 | switch (token) { | |
651 | case Opt_rd_pages: | |
652 | match_int(args, &arg); | |
653 | rd_dev->rd_page_count = arg; | |
6708bb27 | 654 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
655 | " Count: %u\n", rd_dev->rd_page_count); |
656 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
657 | break; | |
658 | default: | |
659 | break; | |
660 | } | |
661 | } | |
662 | ||
663 | kfree(orig); | |
664 | return (!ret) ? count : ret; | |
665 | } | |
666 | ||
667 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
668 | { | |
669 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
670 | ||
671 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
6708bb27 | 672 | pr_debug("Missing rd_pages= parameter\n"); |
e3d6f909 | 673 | return -EINVAL; |
c66ac9db NB |
674 | } |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static ssize_t rd_show_configfs_dev_params( | |
680 | struct se_hba *hba, | |
681 | struct se_subsystem_dev *se_dev, | |
682 | char *b) | |
683 | { | |
684 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
685 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
686 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
687 | "rd_direct" : "rd_mcp"); | |
688 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
689 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
690 | PAGE_SIZE, rd_dev->sg_table_count); | |
691 | return bl; | |
692 | } | |
693 | ||
c66ac9db NB |
694 | static u32 rd_get_device_rev(struct se_device *dev) |
695 | { | |
696 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
697 | } | |
698 | ||
699 | static u32 rd_get_device_type(struct se_device *dev) | |
700 | { | |
701 | return TYPE_DISK; | |
702 | } | |
703 | ||
704 | static sector_t rd_get_blocks(struct se_device *dev) | |
705 | { | |
706 | struct rd_dev *rd_dev = dev->dev_ptr; | |
707 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
e3d6f909 | 708 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
c66ac9db NB |
709 | |
710 | return blocks_long; | |
711 | } | |
712 | ||
c66ac9db NB |
713 | static struct se_subsystem_api rd_mcp_template = { |
714 | .name = "rd_mcp", | |
715 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
716 | .attach_hba = rd_attach_hba, | |
717 | .detach_hba = rd_detach_hba, | |
718 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
719 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
720 | .free_device = rd_free_device, | |
721 | .alloc_task = rd_alloc_task, | |
722 | .do_task = rd_MEMCPY_do_task, | |
723 | .free_task = rd_free_task, | |
724 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
725 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
726 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
c66ac9db NB |
727 | .get_device_rev = rd_get_device_rev, |
728 | .get_device_type = rd_get_device_type, | |
729 | .get_blocks = rd_get_blocks, | |
730 | }; | |
731 | ||
732 | int __init rd_module_init(void) | |
733 | { | |
734 | int ret; | |
735 | ||
c66ac9db NB |
736 | ret = transport_subsystem_register(&rd_mcp_template); |
737 | if (ret < 0) { | |
c66ac9db NB |
738 | return ret; |
739 | } | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | void rd_module_exit(void) | |
745 | { | |
c66ac9db NB |
746 | transport_subsystem_release(&rd_mcp_template); |
747 | } |