]>
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 | ||
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 | ||
47 | static struct se_subsystem_api rd_dr_template; | |
48 | static struct se_subsystem_api rd_mcp_template; | |
49 | ||
50 | /* #define DEBUG_RAMDISK_MCP */ | |
51 | /* #define DEBUG_RAMDISK_DR */ | |
52 | ||
53 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) | |
54 | * | |
55 | * | |
56 | */ | |
57 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
58 | { | |
59 | struct rd_host *rd_host; | |
60 | ||
61 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
62 | if (!(rd_host)) { | |
63 | printk(KERN_ERR "Unable to allocate memory for struct rd_host\n"); | |
64 | return -ENOMEM; | |
65 | } | |
66 | ||
67 | rd_host->rd_host_id = host_id; | |
68 | ||
c66ac9db NB |
69 | hba->hba_ptr = (void *) rd_host; |
70 | ||
71 | printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" | |
72 | " Generic Target Core Stack %s\n", hba->hba_id, | |
73 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
74 | printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" | |
e3d6f909 AG |
75 | " MaxSectors: %u\n", hba->hba_id, |
76 | rd_host->rd_host_id, RD_MAX_SECTORS); | |
c66ac9db NB |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void rd_detach_hba(struct se_hba *hba) | |
82 | { | |
83 | struct rd_host *rd_host = hba->hba_ptr; | |
84 | ||
85 | printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from" | |
86 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); | |
87 | ||
88 | kfree(rd_host); | |
89 | hba->hba_ptr = NULL; | |
90 | } | |
91 | ||
92 | /* rd_release_device_space(): | |
93 | * | |
94 | * | |
95 | */ | |
96 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
97 | { | |
98 | u32 i, j, page_count = 0, sg_per_table; | |
99 | struct rd_dev_sg_table *sg_table; | |
100 | struct page *pg; | |
101 | struct scatterlist *sg; | |
102 | ||
103 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
104 | return; | |
105 | ||
106 | sg_table = rd_dev->sg_table_array; | |
107 | ||
108 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
109 | sg = sg_table[i].sg_table; | |
110 | sg_per_table = sg_table[i].rd_sg_count; | |
111 | ||
112 | for (j = 0; j < sg_per_table; j++) { | |
113 | pg = sg_page(&sg[j]); | |
114 | if ((pg)) { | |
115 | __free_page(pg); | |
116 | page_count++; | |
117 | } | |
118 | } | |
119 | ||
120 | kfree(sg); | |
121 | } | |
122 | ||
123 | printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk" | |
124 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
125 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
126 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
127 | ||
128 | kfree(sg_table); | |
129 | rd_dev->sg_table_array = NULL; | |
130 | rd_dev->sg_table_count = 0; | |
131 | } | |
132 | ||
133 | ||
134 | /* rd_build_device_space(): | |
135 | * | |
136 | * | |
137 | */ | |
138 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
139 | { | |
140 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
141 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
142 | sizeof(struct scatterlist)); | |
143 | struct rd_dev_sg_table *sg_table; | |
144 | struct page *pg; | |
145 | struct scatterlist *sg; | |
146 | ||
147 | if (rd_dev->rd_page_count <= 0) { | |
148 | printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n", | |
149 | rd_dev->rd_page_count); | |
065f9716 | 150 | return -EINVAL; |
c66ac9db NB |
151 | } |
152 | total_sg_needed = rd_dev->rd_page_count; | |
153 | ||
154 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
155 | ||
156 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
157 | if (!(sg_table)) { | |
158 | printk(KERN_ERR "Unable to allocate memory for Ramdisk" | |
159 | " scatterlist tables\n"); | |
065f9716 | 160 | return -ENOMEM; |
c66ac9db NB |
161 | } |
162 | ||
163 | rd_dev->sg_table_array = sg_table; | |
164 | rd_dev->sg_table_count = sg_tables; | |
165 | ||
166 | while (total_sg_needed) { | |
167 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
168 | max_sg_per_table : total_sg_needed; | |
169 | ||
170 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
171 | GFP_KERNEL); | |
172 | if (!(sg)) { | |
173 | printk(KERN_ERR "Unable to allocate scatterlist array" | |
174 | " for struct rd_dev\n"); | |
065f9716 | 175 | return -ENOMEM; |
c66ac9db NB |
176 | } |
177 | ||
178 | sg_init_table((struct scatterlist *)&sg[0], sg_per_table); | |
179 | ||
180 | sg_table[i].sg_table = sg; | |
181 | sg_table[i].rd_sg_count = sg_per_table; | |
182 | sg_table[i].page_start_offset = page_offset; | |
183 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
184 | - 1; | |
185 | ||
186 | for (j = 0; j < sg_per_table; j++) { | |
187 | pg = alloc_pages(GFP_KERNEL, 0); | |
188 | if (!(pg)) { | |
189 | printk(KERN_ERR "Unable to allocate scatterlist" | |
190 | " pages for struct rd_dev_sg_table\n"); | |
065f9716 | 191 | return -ENOMEM; |
c66ac9db NB |
192 | } |
193 | sg_assign_page(&sg[j], pg); | |
194 | sg[j].length = PAGE_SIZE; | |
195 | } | |
196 | ||
197 | page_offset += sg_per_table; | |
198 | total_sg_needed -= sg_per_table; | |
199 | } | |
200 | ||
201 | printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of" | |
202 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
203 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
204 | rd_dev->sg_table_count); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static void *rd_allocate_virtdevice( | |
210 | struct se_hba *hba, | |
211 | const char *name, | |
212 | int rd_direct) | |
213 | { | |
214 | struct rd_dev *rd_dev; | |
215 | struct rd_host *rd_host = hba->hba_ptr; | |
216 | ||
217 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
218 | if (!(rd_dev)) { | |
219 | printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n"); | |
220 | return NULL; | |
221 | } | |
222 | ||
223 | rd_dev->rd_host = rd_host; | |
224 | rd_dev->rd_direct = rd_direct; | |
225 | ||
226 | return rd_dev; | |
227 | } | |
228 | ||
229 | static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name) | |
230 | { | |
231 | return rd_allocate_virtdevice(hba, name, 1); | |
232 | } | |
233 | ||
234 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) | |
235 | { | |
236 | return rd_allocate_virtdevice(hba, name, 0); | |
237 | } | |
238 | ||
239 | /* rd_create_virtdevice(): | |
240 | * | |
241 | * | |
242 | */ | |
243 | static struct se_device *rd_create_virtdevice( | |
244 | struct se_hba *hba, | |
245 | struct se_subsystem_dev *se_dev, | |
246 | void *p, | |
247 | int rd_direct) | |
248 | { | |
249 | struct se_device *dev; | |
250 | struct se_dev_limits dev_limits; | |
251 | struct rd_dev *rd_dev = p; | |
252 | struct rd_host *rd_host = hba->hba_ptr; | |
065f9716 | 253 | int dev_flags = 0, ret; |
c66ac9db NB |
254 | char prod[16], rev[4]; |
255 | ||
256 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
257 | ||
065f9716 DC |
258 | ret = rd_build_device_space(rd_dev); |
259 | if (ret < 0) | |
c66ac9db NB |
260 | goto fail; |
261 | ||
262 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
263 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
264 | RD_MCP_VERSION); | |
265 | ||
266 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
267 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
268 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
269 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
270 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
271 | ||
272 | dev = transport_add_device_to_core_hba(hba, | |
273 | (rd_dev->rd_direct) ? &rd_dr_template : | |
274 | &rd_mcp_template, se_dev, dev_flags, (void *)rd_dev, | |
275 | &dev_limits, prod, rev); | |
276 | if (!(dev)) | |
277 | goto fail; | |
278 | ||
279 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
280 | rd_dev->rd_queue_depth = dev->queue_depth; | |
281 | ||
282 | printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" | |
283 | " %u pages in %u tables, %lu total bytes\n", | |
284 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
285 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
286 | rd_dev->sg_table_count, | |
287 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
288 | ||
289 | return dev; | |
290 | ||
291 | fail: | |
292 | rd_release_device_space(rd_dev); | |
613640e4 | 293 | return ERR_PTR(ret); |
c66ac9db NB |
294 | } |
295 | ||
296 | static struct se_device *rd_DIRECT_create_virtdevice( | |
297 | struct se_hba *hba, | |
298 | struct se_subsystem_dev *se_dev, | |
299 | void *p) | |
300 | { | |
301 | return rd_create_virtdevice(hba, se_dev, p, 1); | |
302 | } | |
303 | ||
304 | static struct se_device *rd_MEMCPY_create_virtdevice( | |
305 | struct se_hba *hba, | |
306 | struct se_subsystem_dev *se_dev, | |
307 | void *p) | |
308 | { | |
309 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
310 | } | |
311 | ||
312 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
313 | * | |
314 | * | |
315 | */ | |
316 | static void rd_free_device(void *p) | |
317 | { | |
318 | struct rd_dev *rd_dev = p; | |
319 | ||
320 | rd_release_device_space(rd_dev); | |
321 | kfree(rd_dev); | |
322 | } | |
323 | ||
324 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
325 | { | |
326 | return container_of(task, struct rd_request, rd_task); | |
327 | } | |
328 | ||
329 | static struct se_task * | |
330 | rd_alloc_task(struct se_cmd *cmd) | |
331 | { | |
332 | struct rd_request *rd_req; | |
333 | ||
334 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
335 | if (!rd_req) { | |
336 | printk(KERN_ERR "Unable to allocate struct rd_request\n"); | |
337 | return NULL; | |
338 | } | |
e3d6f909 | 339 | rd_req->rd_dev = cmd->se_lun->lun_se_dev->dev_ptr; |
c66ac9db NB |
340 | |
341 | return &rd_req->rd_task; | |
342 | } | |
343 | ||
344 | /* rd_get_sg_table(): | |
345 | * | |
346 | * | |
347 | */ | |
348 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
349 | { | |
350 | u32 i; | |
351 | struct rd_dev_sg_table *sg_table; | |
352 | ||
353 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
354 | sg_table = &rd_dev->sg_table_array[i]; | |
355 | if ((sg_table->page_start_offset <= page) && | |
356 | (sg_table->page_end_offset >= page)) | |
357 | return sg_table; | |
358 | } | |
359 | ||
360 | printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n", | |
361 | page); | |
362 | ||
363 | return NULL; | |
364 | } | |
365 | ||
366 | /* rd_MEMCPY_read(): | |
367 | * | |
368 | * | |
369 | */ | |
370 | static int rd_MEMCPY_read(struct rd_request *req) | |
371 | { | |
372 | struct se_task *task = &req->rd_task; | |
373 | struct rd_dev *dev = req->rd_dev; | |
374 | struct rd_dev_sg_table *table; | |
375 | struct scatterlist *sg_d, *sg_s; | |
376 | void *dst, *src; | |
377 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
378 | u32 length, page_end = 0, table_sg_end; | |
379 | u32 rd_offset = req->rd_offset; | |
380 | ||
381 | table = rd_get_sg_table(dev, req->rd_page); | |
382 | if (!(table)) | |
e3d6f909 | 383 | return -EINVAL; |
c66ac9db NB |
384 | |
385 | table_sg_end = (table->page_end_offset - req->rd_page); | |
386 | sg_d = task->task_sg; | |
387 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
388 | #ifdef DEBUG_RAMDISK_MCP | |
389 | printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" | |
390 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
391 | req->rd_page, req->rd_offset); | |
392 | #endif | |
393 | src_offset = rd_offset; | |
394 | ||
395 | while (req->rd_size) { | |
396 | if ((sg_d[i].length - dst_offset) < | |
397 | (sg_s[j].length - src_offset)) { | |
398 | length = (sg_d[i].length - dst_offset); | |
399 | #ifdef DEBUG_RAMDISK_MCP | |
400 | printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d" | |
401 | " offset: %u sg_s[%d].length: %u\n", i, | |
402 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, | |
403 | sg_s[j].length); | |
404 | printk(KERN_INFO "Step 1 - length: %u dst_offset: %u" | |
405 | " src_offset: %u\n", length, dst_offset, | |
406 | src_offset); | |
407 | #endif | |
408 | if (length > req->rd_size) | |
409 | length = req->rd_size; | |
410 | ||
411 | dst = sg_virt(&sg_d[i++]) + dst_offset; | |
412 | if (!dst) | |
413 | BUG(); | |
414 | ||
415 | src = sg_virt(&sg_s[j]) + src_offset; | |
416 | if (!src) | |
417 | BUG(); | |
418 | ||
419 | dst_offset = 0; | |
420 | src_offset = length; | |
421 | page_end = 0; | |
422 | } else { | |
423 | length = (sg_s[j].length - src_offset); | |
424 | #ifdef DEBUG_RAMDISK_MCP | |
425 | printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d" | |
426 | " offset: %u sg_s[%d].length: %u\n", i, | |
427 | &sg_d[i], sg_d[i].length, sg_d[i].offset, | |
428 | j, sg_s[j].length); | |
429 | printk(KERN_INFO "Step 2 - length: %u dst_offset: %u" | |
430 | " src_offset: %u\n", length, dst_offset, | |
431 | src_offset); | |
432 | #endif | |
433 | if (length > req->rd_size) | |
434 | length = req->rd_size; | |
435 | ||
436 | dst = sg_virt(&sg_d[i]) + dst_offset; | |
437 | if (!dst) | |
438 | BUG(); | |
439 | ||
440 | if (sg_d[i].length == length) { | |
441 | i++; | |
442 | dst_offset = 0; | |
443 | } else | |
444 | dst_offset = length; | |
445 | ||
446 | src = sg_virt(&sg_s[j++]) + src_offset; | |
447 | if (!src) | |
448 | BUG(); | |
449 | ||
450 | src_offset = 0; | |
451 | page_end = 1; | |
452 | } | |
453 | ||
454 | memcpy(dst, src, length); | |
455 | ||
456 | #ifdef DEBUG_RAMDISK_MCP | |
457 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
458 | " i: %u, j: %u\n", req->rd_page, | |
459 | (req->rd_size - length), length, i, j); | |
460 | #endif | |
461 | req->rd_size -= length; | |
462 | if (!(req->rd_size)) | |
463 | return 0; | |
464 | ||
465 | if (!page_end) | |
466 | continue; | |
467 | ||
468 | if (++req->rd_page <= table->page_end_offset) { | |
469 | #ifdef DEBUG_RAMDISK_MCP | |
470 | printk(KERN_INFO "page: %u in same page table\n", | |
471 | req->rd_page); | |
472 | #endif | |
473 | continue; | |
474 | } | |
475 | #ifdef DEBUG_RAMDISK_MCP | |
476 | printk(KERN_INFO "getting new page table for page: %u\n", | |
477 | req->rd_page); | |
478 | #endif | |
479 | table = rd_get_sg_table(dev, req->rd_page); | |
480 | if (!(table)) | |
e3d6f909 | 481 | return -EINVAL; |
c66ac9db NB |
482 | |
483 | sg_s = &table->sg_table[j = 0]; | |
484 | } | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | /* rd_MEMCPY_write(): | |
490 | * | |
491 | * | |
492 | */ | |
493 | static int rd_MEMCPY_write(struct rd_request *req) | |
494 | { | |
495 | struct se_task *task = &req->rd_task; | |
496 | struct rd_dev *dev = req->rd_dev; | |
497 | struct rd_dev_sg_table *table; | |
498 | struct scatterlist *sg_d, *sg_s; | |
499 | void *dst, *src; | |
500 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
501 | u32 length, page_end = 0, table_sg_end; | |
502 | u32 rd_offset = req->rd_offset; | |
503 | ||
504 | table = rd_get_sg_table(dev, req->rd_page); | |
505 | if (!(table)) | |
e3d6f909 | 506 | return -EINVAL; |
c66ac9db NB |
507 | |
508 | table_sg_end = (table->page_end_offset - req->rd_page); | |
509 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; | |
510 | sg_s = task->task_sg; | |
511 | #ifdef DEBUG_RAMDISK_MCP | |
512 | printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u," | |
513 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
514 | req->rd_page, req->rd_offset); | |
515 | #endif | |
516 | dst_offset = rd_offset; | |
517 | ||
518 | while (req->rd_size) { | |
519 | if ((sg_s[i].length - src_offset) < | |
520 | (sg_d[j].length - dst_offset)) { | |
521 | length = (sg_s[i].length - src_offset); | |
522 | #ifdef DEBUG_RAMDISK_MCP | |
523 | printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d" | |
524 | " offset: %d sg_d[%d].length: %u\n", i, | |
525 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
526 | j, sg_d[j].length); | |
527 | printk(KERN_INFO "Step 1 - length: %u src_offset: %u" | |
528 | " dst_offset: %u\n", length, src_offset, | |
529 | dst_offset); | |
530 | #endif | |
531 | if (length > req->rd_size) | |
532 | length = req->rd_size; | |
533 | ||
534 | src = sg_virt(&sg_s[i++]) + src_offset; | |
535 | if (!src) | |
536 | BUG(); | |
537 | ||
538 | dst = sg_virt(&sg_d[j]) + dst_offset; | |
539 | if (!dst) | |
540 | BUG(); | |
541 | ||
542 | src_offset = 0; | |
543 | dst_offset = length; | |
544 | page_end = 0; | |
545 | } else { | |
546 | length = (sg_d[j].length - dst_offset); | |
547 | #ifdef DEBUG_RAMDISK_MCP | |
548 | printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d" | |
549 | " offset: %d sg_d[%d].length: %u\n", i, | |
550 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
551 | j, sg_d[j].length); | |
552 | printk(KERN_INFO "Step 2 - length: %u src_offset: %u" | |
553 | " dst_offset: %u\n", length, src_offset, | |
554 | dst_offset); | |
555 | #endif | |
556 | if (length > req->rd_size) | |
557 | length = req->rd_size; | |
558 | ||
559 | src = sg_virt(&sg_s[i]) + src_offset; | |
560 | if (!src) | |
561 | BUG(); | |
562 | ||
563 | if (sg_s[i].length == length) { | |
564 | i++; | |
565 | src_offset = 0; | |
566 | } else | |
567 | src_offset = length; | |
568 | ||
569 | dst = sg_virt(&sg_d[j++]) + dst_offset; | |
570 | if (!dst) | |
571 | BUG(); | |
572 | ||
573 | dst_offset = 0; | |
574 | page_end = 1; | |
575 | } | |
576 | ||
577 | memcpy(dst, src, length); | |
578 | ||
579 | #ifdef DEBUG_RAMDISK_MCP | |
580 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
581 | " i: %u, j: %u\n", req->rd_page, | |
582 | (req->rd_size - length), length, i, j); | |
583 | #endif | |
584 | req->rd_size -= length; | |
585 | if (!(req->rd_size)) | |
586 | return 0; | |
587 | ||
588 | if (!page_end) | |
589 | continue; | |
590 | ||
591 | if (++req->rd_page <= table->page_end_offset) { | |
592 | #ifdef DEBUG_RAMDISK_MCP | |
593 | printk(KERN_INFO "page: %u in same page table\n", | |
594 | req->rd_page); | |
595 | #endif | |
596 | continue; | |
597 | } | |
598 | #ifdef DEBUG_RAMDISK_MCP | |
599 | printk(KERN_INFO "getting new page table for page: %u\n", | |
600 | req->rd_page); | |
601 | #endif | |
602 | table = rd_get_sg_table(dev, req->rd_page); | |
603 | if (!(table)) | |
e3d6f909 | 604 | return -EINVAL; |
c66ac9db NB |
605 | |
606 | sg_d = &table->sg_table[j = 0]; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
613 | * | |
614 | * | |
615 | */ | |
616 | static int rd_MEMCPY_do_task(struct se_task *task) | |
617 | { | |
618 | struct se_device *dev = task->se_dev; | |
619 | struct rd_request *req = RD_REQ(task); | |
620 | unsigned long long lba; | |
621 | int ret; | |
622 | ||
e3d6f909 | 623 | req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE; |
c66ac9db NB |
624 | lba = task->task_lba; |
625 | req->rd_offset = (do_div(lba, | |
e3d6f909 AG |
626 | (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) * |
627 | dev->se_sub_dev->se_dev_attrib.block_size; | |
c66ac9db NB |
628 | req->rd_size = task->task_size; |
629 | ||
630 | if (task->task_data_direction == DMA_FROM_DEVICE) | |
631 | ret = rd_MEMCPY_read(req); | |
632 | else | |
633 | ret = rd_MEMCPY_write(req); | |
634 | ||
635 | if (ret != 0) | |
636 | return ret; | |
637 | ||
638 | task->task_scsi_status = GOOD; | |
639 | transport_complete_task(task, 1); | |
640 | ||
641 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
642 | } | |
643 | ||
644 | /* rd_DIRECT_with_offset(): | |
645 | * | |
646 | * | |
647 | */ | |
648 | static int rd_DIRECT_with_offset( | |
649 | struct se_task *task, | |
650 | struct list_head *se_mem_list, | |
651 | u32 *se_mem_cnt, | |
652 | u32 *task_offset) | |
653 | { | |
654 | struct rd_request *req = RD_REQ(task); | |
655 | struct rd_dev *dev = req->rd_dev; | |
656 | struct rd_dev_sg_table *table; | |
657 | struct se_mem *se_mem; | |
658 | struct scatterlist *sg_s; | |
659 | u32 j = 0, set_offset = 1; | |
660 | u32 get_next_table = 0, offset_length, table_sg_end; | |
661 | ||
662 | table = rd_get_sg_table(dev, req->rd_page); | |
663 | if (!(table)) | |
e3d6f909 | 664 | return -EINVAL; |
c66ac9db NB |
665 | |
666 | table_sg_end = (table->page_end_offset - req->rd_page); | |
667 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
668 | #ifdef DEBUG_RAMDISK_DR | |
669 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n", | |
670 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
671 | "Write" : "Read", | |
672 | task->task_lba, req->rd_size, req->rd_page, req->rd_offset); | |
673 | #endif | |
674 | while (req->rd_size) { | |
675 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
676 | if (!(se_mem)) { | |
677 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
e3d6f909 | 678 | return -ENOMEM; |
c66ac9db NB |
679 | } |
680 | INIT_LIST_HEAD(&se_mem->se_list); | |
681 | ||
682 | if (set_offset) { | |
683 | offset_length = sg_s[j].length - req->rd_offset; | |
684 | if (offset_length > req->rd_size) | |
685 | offset_length = req->rd_size; | |
686 | ||
687 | se_mem->se_page = sg_page(&sg_s[j++]); | |
688 | se_mem->se_off = req->rd_offset; | |
689 | se_mem->se_len = offset_length; | |
690 | ||
691 | set_offset = 0; | |
692 | get_next_table = (j > table_sg_end); | |
693 | goto check_eot; | |
694 | } | |
695 | ||
696 | offset_length = (req->rd_size < req->rd_offset) ? | |
697 | req->rd_size : req->rd_offset; | |
698 | ||
699 | se_mem->se_page = sg_page(&sg_s[j]); | |
700 | se_mem->se_len = offset_length; | |
701 | ||
702 | set_offset = 1; | |
703 | ||
704 | check_eot: | |
705 | #ifdef DEBUG_RAMDISK_DR | |
706 | printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u" | |
707 | " se_mem: %p, se_page: %p se_off: %u se_len: %u\n", | |
708 | req->rd_page, req->rd_size, offset_length, j, se_mem, | |
709 | se_mem->se_page, se_mem->se_off, se_mem->se_len); | |
710 | #endif | |
711 | list_add_tail(&se_mem->se_list, se_mem_list); | |
712 | (*se_mem_cnt)++; | |
713 | ||
714 | req->rd_size -= offset_length; | |
715 | if (!(req->rd_size)) | |
716 | goto out; | |
717 | ||
718 | if (!set_offset && !get_next_table) | |
719 | continue; | |
720 | ||
721 | if (++req->rd_page <= table->page_end_offset) { | |
722 | #ifdef DEBUG_RAMDISK_DR | |
723 | printk(KERN_INFO "page: %u in same page table\n", | |
724 | req->rd_page); | |
725 | #endif | |
726 | continue; | |
727 | } | |
728 | #ifdef DEBUG_RAMDISK_DR | |
729 | printk(KERN_INFO "getting new page table for page: %u\n", | |
730 | req->rd_page); | |
731 | #endif | |
732 | table = rd_get_sg_table(dev, req->rd_page); | |
733 | if (!(table)) | |
e3d6f909 | 734 | return -EINVAL; |
c66ac9db NB |
735 | |
736 | sg_s = &table->sg_table[j = 0]; | |
737 | } | |
738 | ||
739 | out: | |
e3d6f909 | 740 | task->task_se_cmd->t_task->t_tasks_se_num += *se_mem_cnt; |
c66ac9db NB |
741 | #ifdef DEBUG_RAMDISK_DR |
742 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
743 | *se_mem_cnt); | |
744 | #endif | |
745 | return 0; | |
746 | } | |
747 | ||
748 | /* rd_DIRECT_without_offset(): | |
749 | * | |
750 | * | |
751 | */ | |
752 | static int rd_DIRECT_without_offset( | |
753 | struct se_task *task, | |
754 | struct list_head *se_mem_list, | |
755 | u32 *se_mem_cnt, | |
756 | u32 *task_offset) | |
757 | { | |
758 | struct rd_request *req = RD_REQ(task); | |
759 | struct rd_dev *dev = req->rd_dev; | |
760 | struct rd_dev_sg_table *table; | |
761 | struct se_mem *se_mem; | |
762 | struct scatterlist *sg_s; | |
763 | u32 length, j = 0; | |
764 | ||
765 | table = rd_get_sg_table(dev, req->rd_page); | |
766 | if (!(table)) | |
e3d6f909 | 767 | return -EINVAL; |
c66ac9db NB |
768 | |
769 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
770 | #ifdef DEBUG_RAMDISK_DR | |
771 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n", | |
772 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
773 | "Write" : "Read", | |
774 | task->task_lba, req->rd_size, req->rd_page); | |
775 | #endif | |
776 | while (req->rd_size) { | |
777 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
778 | if (!(se_mem)) { | |
779 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
e3d6f909 | 780 | return -ENOMEM; |
c66ac9db NB |
781 | } |
782 | INIT_LIST_HEAD(&se_mem->se_list); | |
783 | ||
784 | length = (req->rd_size < sg_s[j].length) ? | |
785 | req->rd_size : sg_s[j].length; | |
786 | ||
787 | se_mem->se_page = sg_page(&sg_s[j++]); | |
788 | se_mem->se_len = length; | |
789 | ||
790 | #ifdef DEBUG_RAMDISK_DR | |
791 | printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p," | |
792 | " se_page: %p se_off: %u se_len: %u\n", req->rd_page, | |
793 | req->rd_size, j, se_mem, se_mem->se_page, | |
794 | se_mem->se_off, se_mem->se_len); | |
795 | #endif | |
796 | list_add_tail(&se_mem->se_list, se_mem_list); | |
797 | (*se_mem_cnt)++; | |
798 | ||
799 | req->rd_size -= length; | |
800 | if (!(req->rd_size)) | |
801 | goto out; | |
802 | ||
803 | if (++req->rd_page <= table->page_end_offset) { | |
804 | #ifdef DEBUG_RAMDISK_DR | |
805 | printk("page: %u in same page table\n", | |
806 | req->rd_page); | |
807 | #endif | |
808 | continue; | |
809 | } | |
810 | #ifdef DEBUG_RAMDISK_DR | |
811 | printk(KERN_INFO "getting new page table for page: %u\n", | |
812 | req->rd_page); | |
813 | #endif | |
814 | table = rd_get_sg_table(dev, req->rd_page); | |
815 | if (!(table)) | |
e3d6f909 | 816 | return -EINVAL; |
c66ac9db NB |
817 | |
818 | sg_s = &table->sg_table[j = 0]; | |
819 | } | |
820 | ||
821 | out: | |
e3d6f909 | 822 | task->task_se_cmd->t_task->t_tasks_se_num += *se_mem_cnt; |
c66ac9db NB |
823 | #ifdef DEBUG_RAMDISK_DR |
824 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
825 | *se_mem_cnt); | |
826 | #endif | |
827 | return 0; | |
828 | } | |
829 | ||
830 | /* rd_DIRECT_do_se_mem_map(): | |
831 | * | |
832 | * | |
833 | */ | |
834 | static int rd_DIRECT_do_se_mem_map( | |
835 | struct se_task *task, | |
836 | struct list_head *se_mem_list, | |
837 | void *in_mem, | |
838 | struct se_mem *in_se_mem, | |
839 | struct se_mem **out_se_mem, | |
840 | u32 *se_mem_cnt, | |
841 | u32 *task_offset_in) | |
842 | { | |
843 | struct se_cmd *cmd = task->task_se_cmd; | |
844 | struct rd_request *req = RD_REQ(task); | |
845 | u32 task_offset = *task_offset_in; | |
846 | unsigned long long lba; | |
847 | int ret; | |
e3d6f909 | 848 | int block_size = task->se_dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db | 849 | |
c66ac9db | 850 | lba = task->task_lba; |
e3d6f909 AG |
851 | req->rd_page = ((task->task_lba * block_size) / PAGE_SIZE); |
852 | req->rd_offset = (do_div(lba, (PAGE_SIZE / block_size))) * block_size; | |
c66ac9db NB |
853 | req->rd_size = task->task_size; |
854 | ||
855 | if (req->rd_offset) | |
856 | ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt, | |
857 | task_offset_in); | |
858 | else | |
859 | ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt, | |
860 | task_offset_in); | |
861 | ||
862 | if (ret < 0) | |
863 | return ret; | |
864 | ||
e3d6f909 | 865 | if (cmd->se_tfo->task_sg_chaining == 0) |
c66ac9db NB |
866 | return 0; |
867 | /* | |
868 | * Currently prevent writers from multiple HW fabrics doing | |
869 | * pci_map_sg() to RD_DR's internal scatterlist memory. | |
870 | */ | |
871 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
872 | printk(KERN_ERR "DMA_TO_DEVICE not supported for" | |
873 | " RAMDISK_DR with task_sg_chaining=1\n"); | |
e3d6f909 | 874 | return -ENOSYS; |
c66ac9db NB |
875 | } |
876 | /* | |
877 | * Special case for if task_sg_chaining is enabled, then | |
878 | * we setup struct se_task->task_sg[], as it will be used by | |
879 | * transport_do_task_sg_chain() for creating chainged SGLs | |
880 | * across multiple struct se_task->task_sg[]. | |
881 | */ | |
e3d6f909 AG |
882 | ret = transport_init_task_sg(task, |
883 | list_entry(cmd->t_task->t_mem_list->next, | |
c66ac9db | 884 | struct se_mem, se_list), |
e3d6f909 AG |
885 | task_offset); |
886 | if (ret <= 0) | |
887 | return ret; | |
c66ac9db NB |
888 | |
889 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, | |
e3d6f909 | 890 | list_entry(cmd->t_task->t_mem_list->next, |
c66ac9db NB |
891 | struct se_mem, se_list), |
892 | out_se_mem, se_mem_cnt, task_offset_in); | |
893 | } | |
894 | ||
895 | /* rd_DIRECT_do_task(): (Part of se_subsystem_api_t template) | |
896 | * | |
897 | * | |
898 | */ | |
899 | static int rd_DIRECT_do_task(struct se_task *task) | |
900 | { | |
901 | /* | |
902 | * At this point the locally allocated RD tables have been mapped | |
903 | * to struct se_mem elements in rd_DIRECT_do_se_mem_map(). | |
904 | */ | |
905 | task->task_scsi_status = GOOD; | |
906 | transport_complete_task(task, 1); | |
907 | ||
908 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
909 | } | |
910 | ||
911 | /* rd_free_task(): (Part of se_subsystem_api_t template) | |
912 | * | |
913 | * | |
914 | */ | |
915 | static void rd_free_task(struct se_task *task) | |
916 | { | |
917 | kfree(RD_REQ(task)); | |
918 | } | |
919 | ||
920 | enum { | |
921 | Opt_rd_pages, Opt_err | |
922 | }; | |
923 | ||
924 | static match_table_t tokens = { | |
925 | {Opt_rd_pages, "rd_pages=%d"}, | |
926 | {Opt_err, NULL} | |
927 | }; | |
928 | ||
929 | static ssize_t rd_set_configfs_dev_params( | |
930 | struct se_hba *hba, | |
931 | struct se_subsystem_dev *se_dev, | |
932 | const char *page, | |
933 | ssize_t count) | |
934 | { | |
935 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
936 | char *orig, *ptr, *opts; | |
937 | substring_t args[MAX_OPT_ARGS]; | |
938 | int ret = 0, arg, token; | |
939 | ||
940 | opts = kstrdup(page, GFP_KERNEL); | |
941 | if (!opts) | |
942 | return -ENOMEM; | |
943 | ||
944 | orig = opts; | |
945 | ||
946 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
947 | if (!*ptr) | |
948 | continue; | |
949 | ||
950 | token = match_token(ptr, tokens, args); | |
951 | switch (token) { | |
952 | case Opt_rd_pages: | |
953 | match_int(args, &arg); | |
954 | rd_dev->rd_page_count = arg; | |
955 | printk(KERN_INFO "RAMDISK: Referencing Page" | |
956 | " Count: %u\n", rd_dev->rd_page_count); | |
957 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
958 | break; | |
959 | default: | |
960 | break; | |
961 | } | |
962 | } | |
963 | ||
964 | kfree(orig); | |
965 | return (!ret) ? count : ret; | |
966 | } | |
967 | ||
968 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
969 | { | |
970 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
971 | ||
972 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
973 | printk(KERN_INFO "Missing rd_pages= parameter\n"); | |
e3d6f909 | 974 | return -EINVAL; |
c66ac9db NB |
975 | } |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
980 | static ssize_t rd_show_configfs_dev_params( | |
981 | struct se_hba *hba, | |
982 | struct se_subsystem_dev *se_dev, | |
983 | char *b) | |
984 | { | |
985 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
986 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
987 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
988 | "rd_direct" : "rd_mcp"); | |
989 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
990 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
991 | PAGE_SIZE, rd_dev->sg_table_count); | |
992 | return bl; | |
993 | } | |
994 | ||
995 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) | |
996 | * | |
997 | * | |
998 | */ | |
999 | static unsigned char *rd_get_cdb(struct se_task *task) | |
1000 | { | |
1001 | struct rd_request *req = RD_REQ(task); | |
1002 | ||
1003 | return req->rd_scsi_cdb; | |
1004 | } | |
1005 | ||
1006 | static u32 rd_get_device_rev(struct se_device *dev) | |
1007 | { | |
1008 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
1009 | } | |
1010 | ||
1011 | static u32 rd_get_device_type(struct se_device *dev) | |
1012 | { | |
1013 | return TYPE_DISK; | |
1014 | } | |
1015 | ||
1016 | static sector_t rd_get_blocks(struct se_device *dev) | |
1017 | { | |
1018 | struct rd_dev *rd_dev = dev->dev_ptr; | |
1019 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
e3d6f909 | 1020 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
c66ac9db NB |
1021 | |
1022 | return blocks_long; | |
1023 | } | |
1024 | ||
1025 | static struct se_subsystem_api rd_dr_template = { | |
1026 | .name = "rd_dr", | |
1027 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1028 | .attach_hba = rd_attach_hba, | |
1029 | .detach_hba = rd_detach_hba, | |
1030 | .allocate_virtdevice = rd_DIRECT_allocate_virtdevice, | |
1031 | .create_virtdevice = rd_DIRECT_create_virtdevice, | |
1032 | .free_device = rd_free_device, | |
1033 | .alloc_task = rd_alloc_task, | |
1034 | .do_task = rd_DIRECT_do_task, | |
1035 | .free_task = rd_free_task, | |
1036 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1037 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1038 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1039 | .get_cdb = rd_get_cdb, | |
1040 | .get_device_rev = rd_get_device_rev, | |
1041 | .get_device_type = rd_get_device_type, | |
1042 | .get_blocks = rd_get_blocks, | |
1043 | .do_se_mem_map = rd_DIRECT_do_se_mem_map, | |
1044 | }; | |
1045 | ||
1046 | static struct se_subsystem_api rd_mcp_template = { | |
1047 | .name = "rd_mcp", | |
1048 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1049 | .attach_hba = rd_attach_hba, | |
1050 | .detach_hba = rd_detach_hba, | |
1051 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
1052 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
1053 | .free_device = rd_free_device, | |
1054 | .alloc_task = rd_alloc_task, | |
1055 | .do_task = rd_MEMCPY_do_task, | |
1056 | .free_task = rd_free_task, | |
1057 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1058 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1059 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1060 | .get_cdb = rd_get_cdb, | |
1061 | .get_device_rev = rd_get_device_rev, | |
1062 | .get_device_type = rd_get_device_type, | |
1063 | .get_blocks = rd_get_blocks, | |
1064 | }; | |
1065 | ||
1066 | int __init rd_module_init(void) | |
1067 | { | |
1068 | int ret; | |
1069 | ||
1070 | ret = transport_subsystem_register(&rd_dr_template); | |
1071 | if (ret < 0) | |
1072 | return ret; | |
1073 | ||
1074 | ret = transport_subsystem_register(&rd_mcp_template); | |
1075 | if (ret < 0) { | |
1076 | transport_subsystem_release(&rd_dr_template); | |
1077 | return ret; | |
1078 | } | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | void rd_module_exit(void) | |
1084 | { | |
1085 | transport_subsystem_release(&rd_dr_template); | |
1086 | transport_subsystem_release(&rd_mcp_template); | |
1087 | } |