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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 | ||
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 | ||
69 | atomic_set(&hba->left_queue_depth, RD_HBA_QUEUE_DEPTH); | |
70 | atomic_set(&hba->max_queue_depth, RD_HBA_QUEUE_DEPTH); | |
71 | hba->hba_ptr = (void *) rd_host; | |
72 | ||
73 | printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" | |
74 | " Generic Target Core Stack %s\n", hba->hba_id, | |
75 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
76 | printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" | |
77 | " Target Core TCQ Depth: %d MaxSectors: %u\n", hba->hba_id, | |
78 | rd_host->rd_host_id, atomic_read(&hba->max_queue_depth), | |
79 | RD_MAX_SECTORS); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static void rd_detach_hba(struct se_hba *hba) | |
85 | { | |
86 | struct rd_host *rd_host = hba->hba_ptr; | |
87 | ||
88 | printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from" | |
89 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); | |
90 | ||
91 | kfree(rd_host); | |
92 | hba->hba_ptr = NULL; | |
93 | } | |
94 | ||
95 | /* rd_release_device_space(): | |
96 | * | |
97 | * | |
98 | */ | |
99 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
100 | { | |
101 | u32 i, j, page_count = 0, sg_per_table; | |
102 | struct rd_dev_sg_table *sg_table; | |
103 | struct page *pg; | |
104 | struct scatterlist *sg; | |
105 | ||
106 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
107 | return; | |
108 | ||
109 | sg_table = rd_dev->sg_table_array; | |
110 | ||
111 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
112 | sg = sg_table[i].sg_table; | |
113 | sg_per_table = sg_table[i].rd_sg_count; | |
114 | ||
115 | for (j = 0; j < sg_per_table; j++) { | |
116 | pg = sg_page(&sg[j]); | |
117 | if ((pg)) { | |
118 | __free_page(pg); | |
119 | page_count++; | |
120 | } | |
121 | } | |
122 | ||
123 | kfree(sg); | |
124 | } | |
125 | ||
126 | printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk" | |
127 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
128 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
129 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
130 | ||
131 | kfree(sg_table); | |
132 | rd_dev->sg_table_array = NULL; | |
133 | rd_dev->sg_table_count = 0; | |
134 | } | |
135 | ||
136 | ||
137 | /* rd_build_device_space(): | |
138 | * | |
139 | * | |
140 | */ | |
141 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
142 | { | |
143 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
144 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
145 | sizeof(struct scatterlist)); | |
146 | struct rd_dev_sg_table *sg_table; | |
147 | struct page *pg; | |
148 | struct scatterlist *sg; | |
149 | ||
150 | if (rd_dev->rd_page_count <= 0) { | |
151 | printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n", | |
152 | rd_dev->rd_page_count); | |
153 | return -1; | |
154 | } | |
155 | total_sg_needed = rd_dev->rd_page_count; | |
156 | ||
157 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
158 | ||
159 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
160 | if (!(sg_table)) { | |
161 | printk(KERN_ERR "Unable to allocate memory for Ramdisk" | |
162 | " scatterlist tables\n"); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | rd_dev->sg_table_array = sg_table; | |
167 | rd_dev->sg_table_count = sg_tables; | |
168 | ||
169 | while (total_sg_needed) { | |
170 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
171 | max_sg_per_table : total_sg_needed; | |
172 | ||
173 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
174 | GFP_KERNEL); | |
175 | if (!(sg)) { | |
176 | printk(KERN_ERR "Unable to allocate scatterlist array" | |
177 | " for struct rd_dev\n"); | |
178 | return -1; | |
179 | } | |
180 | ||
181 | sg_init_table((struct scatterlist *)&sg[0], sg_per_table); | |
182 | ||
183 | sg_table[i].sg_table = sg; | |
184 | sg_table[i].rd_sg_count = sg_per_table; | |
185 | sg_table[i].page_start_offset = page_offset; | |
186 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
187 | - 1; | |
188 | ||
189 | for (j = 0; j < sg_per_table; j++) { | |
190 | pg = alloc_pages(GFP_KERNEL, 0); | |
191 | if (!(pg)) { | |
192 | printk(KERN_ERR "Unable to allocate scatterlist" | |
193 | " pages for struct rd_dev_sg_table\n"); | |
194 | return -1; | |
195 | } | |
196 | sg_assign_page(&sg[j], pg); | |
197 | sg[j].length = PAGE_SIZE; | |
198 | } | |
199 | ||
200 | page_offset += sg_per_table; | |
201 | total_sg_needed -= sg_per_table; | |
202 | } | |
203 | ||
204 | printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of" | |
205 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
206 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
207 | rd_dev->sg_table_count); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static void *rd_allocate_virtdevice( | |
213 | struct se_hba *hba, | |
214 | const char *name, | |
215 | int rd_direct) | |
216 | { | |
217 | struct rd_dev *rd_dev; | |
218 | struct rd_host *rd_host = hba->hba_ptr; | |
219 | ||
220 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
221 | if (!(rd_dev)) { | |
222 | printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n"); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | rd_dev->rd_host = rd_host; | |
227 | rd_dev->rd_direct = rd_direct; | |
228 | ||
229 | return rd_dev; | |
230 | } | |
231 | ||
232 | static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name) | |
233 | { | |
234 | return rd_allocate_virtdevice(hba, name, 1); | |
235 | } | |
236 | ||
237 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) | |
238 | { | |
239 | return rd_allocate_virtdevice(hba, name, 0); | |
240 | } | |
241 | ||
242 | /* rd_create_virtdevice(): | |
243 | * | |
244 | * | |
245 | */ | |
246 | static struct se_device *rd_create_virtdevice( | |
247 | struct se_hba *hba, | |
248 | struct se_subsystem_dev *se_dev, | |
249 | void *p, | |
250 | int rd_direct) | |
251 | { | |
252 | struct se_device *dev; | |
253 | struct se_dev_limits dev_limits; | |
254 | struct rd_dev *rd_dev = p; | |
255 | struct rd_host *rd_host = hba->hba_ptr; | |
256 | int dev_flags = 0; | |
257 | char prod[16], rev[4]; | |
258 | ||
259 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
260 | ||
261 | if (rd_build_device_space(rd_dev) < 0) | |
262 | goto fail; | |
263 | ||
264 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
265 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
266 | RD_MCP_VERSION); | |
267 | ||
268 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
269 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
270 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
271 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
272 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
273 | ||
274 | dev = transport_add_device_to_core_hba(hba, | |
275 | (rd_dev->rd_direct) ? &rd_dr_template : | |
276 | &rd_mcp_template, se_dev, dev_flags, (void *)rd_dev, | |
277 | &dev_limits, prod, rev); | |
278 | if (!(dev)) | |
279 | goto fail; | |
280 | ||
281 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
282 | rd_dev->rd_queue_depth = dev->queue_depth; | |
283 | ||
284 | printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" | |
285 | " %u pages in %u tables, %lu total bytes\n", | |
286 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
287 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
288 | rd_dev->sg_table_count, | |
289 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
290 | ||
291 | return dev; | |
292 | ||
293 | fail: | |
294 | rd_release_device_space(rd_dev); | |
295 | return NULL; | |
296 | } | |
297 | ||
298 | static struct se_device *rd_DIRECT_create_virtdevice( | |
299 | struct se_hba *hba, | |
300 | struct se_subsystem_dev *se_dev, | |
301 | void *p) | |
302 | { | |
303 | return rd_create_virtdevice(hba, se_dev, p, 1); | |
304 | } | |
305 | ||
306 | static struct se_device *rd_MEMCPY_create_virtdevice( | |
307 | struct se_hba *hba, | |
308 | struct se_subsystem_dev *se_dev, | |
309 | void *p) | |
310 | { | |
311 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
312 | } | |
313 | ||
314 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
315 | * | |
316 | * | |
317 | */ | |
318 | static void rd_free_device(void *p) | |
319 | { | |
320 | struct rd_dev *rd_dev = p; | |
321 | ||
322 | rd_release_device_space(rd_dev); | |
323 | kfree(rd_dev); | |
324 | } | |
325 | ||
326 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
327 | { | |
328 | return container_of(task, struct rd_request, rd_task); | |
329 | } | |
330 | ||
331 | static struct se_task * | |
332 | rd_alloc_task(struct se_cmd *cmd) | |
333 | { | |
334 | struct rd_request *rd_req; | |
335 | ||
336 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
337 | if (!rd_req) { | |
338 | printk(KERN_ERR "Unable to allocate struct rd_request\n"); | |
339 | return NULL; | |
340 | } | |
341 | rd_req->rd_dev = SE_DEV(cmd)->dev_ptr; | |
342 | ||
343 | return &rd_req->rd_task; | |
344 | } | |
345 | ||
346 | /* rd_get_sg_table(): | |
347 | * | |
348 | * | |
349 | */ | |
350 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
351 | { | |
352 | u32 i; | |
353 | struct rd_dev_sg_table *sg_table; | |
354 | ||
355 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
356 | sg_table = &rd_dev->sg_table_array[i]; | |
357 | if ((sg_table->page_start_offset <= page) && | |
358 | (sg_table->page_end_offset >= page)) | |
359 | return sg_table; | |
360 | } | |
361 | ||
362 | printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n", | |
363 | page); | |
364 | ||
365 | return NULL; | |
366 | } | |
367 | ||
368 | /* rd_MEMCPY_read(): | |
369 | * | |
370 | * | |
371 | */ | |
372 | static int rd_MEMCPY_read(struct rd_request *req) | |
373 | { | |
374 | struct se_task *task = &req->rd_task; | |
375 | struct rd_dev *dev = req->rd_dev; | |
376 | struct rd_dev_sg_table *table; | |
377 | struct scatterlist *sg_d, *sg_s; | |
378 | void *dst, *src; | |
379 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
380 | u32 length, page_end = 0, table_sg_end; | |
381 | u32 rd_offset = req->rd_offset; | |
382 | ||
383 | table = rd_get_sg_table(dev, req->rd_page); | |
384 | if (!(table)) | |
385 | return -1; | |
386 | ||
387 | table_sg_end = (table->page_end_offset - req->rd_page); | |
388 | sg_d = task->task_sg; | |
389 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
390 | #ifdef DEBUG_RAMDISK_MCP | |
391 | printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" | |
392 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
393 | req->rd_page, req->rd_offset); | |
394 | #endif | |
395 | src_offset = rd_offset; | |
396 | ||
397 | while (req->rd_size) { | |
398 | if ((sg_d[i].length - dst_offset) < | |
399 | (sg_s[j].length - src_offset)) { | |
400 | length = (sg_d[i].length - dst_offset); | |
401 | #ifdef DEBUG_RAMDISK_MCP | |
402 | printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d" | |
403 | " offset: %u sg_s[%d].length: %u\n", i, | |
404 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, | |
405 | sg_s[j].length); | |
406 | printk(KERN_INFO "Step 1 - length: %u dst_offset: %u" | |
407 | " src_offset: %u\n", length, dst_offset, | |
408 | src_offset); | |
409 | #endif | |
410 | if (length > req->rd_size) | |
411 | length = req->rd_size; | |
412 | ||
413 | dst = sg_virt(&sg_d[i++]) + dst_offset; | |
414 | if (!dst) | |
415 | BUG(); | |
416 | ||
417 | src = sg_virt(&sg_s[j]) + src_offset; | |
418 | if (!src) | |
419 | BUG(); | |
420 | ||
421 | dst_offset = 0; | |
422 | src_offset = length; | |
423 | page_end = 0; | |
424 | } else { | |
425 | length = (sg_s[j].length - src_offset); | |
426 | #ifdef DEBUG_RAMDISK_MCP | |
427 | printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d" | |
428 | " offset: %u sg_s[%d].length: %u\n", i, | |
429 | &sg_d[i], sg_d[i].length, sg_d[i].offset, | |
430 | j, sg_s[j].length); | |
431 | printk(KERN_INFO "Step 2 - length: %u dst_offset: %u" | |
432 | " src_offset: %u\n", length, dst_offset, | |
433 | src_offset); | |
434 | #endif | |
435 | if (length > req->rd_size) | |
436 | length = req->rd_size; | |
437 | ||
438 | dst = sg_virt(&sg_d[i]) + dst_offset; | |
439 | if (!dst) | |
440 | BUG(); | |
441 | ||
442 | if (sg_d[i].length == length) { | |
443 | i++; | |
444 | dst_offset = 0; | |
445 | } else | |
446 | dst_offset = length; | |
447 | ||
448 | src = sg_virt(&sg_s[j++]) + src_offset; | |
449 | if (!src) | |
450 | BUG(); | |
451 | ||
452 | src_offset = 0; | |
453 | page_end = 1; | |
454 | } | |
455 | ||
456 | memcpy(dst, src, length); | |
457 | ||
458 | #ifdef DEBUG_RAMDISK_MCP | |
459 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
460 | " i: %u, j: %u\n", req->rd_page, | |
461 | (req->rd_size - length), length, i, j); | |
462 | #endif | |
463 | req->rd_size -= length; | |
464 | if (!(req->rd_size)) | |
465 | return 0; | |
466 | ||
467 | if (!page_end) | |
468 | continue; | |
469 | ||
470 | if (++req->rd_page <= table->page_end_offset) { | |
471 | #ifdef DEBUG_RAMDISK_MCP | |
472 | printk(KERN_INFO "page: %u in same page table\n", | |
473 | req->rd_page); | |
474 | #endif | |
475 | continue; | |
476 | } | |
477 | #ifdef DEBUG_RAMDISK_MCP | |
478 | printk(KERN_INFO "getting new page table for page: %u\n", | |
479 | req->rd_page); | |
480 | #endif | |
481 | table = rd_get_sg_table(dev, req->rd_page); | |
482 | if (!(table)) | |
483 | return -1; | |
484 | ||
485 | sg_s = &table->sg_table[j = 0]; | |
486 | } | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | /* rd_MEMCPY_write(): | |
492 | * | |
493 | * | |
494 | */ | |
495 | static int rd_MEMCPY_write(struct rd_request *req) | |
496 | { | |
497 | struct se_task *task = &req->rd_task; | |
498 | struct rd_dev *dev = req->rd_dev; | |
499 | struct rd_dev_sg_table *table; | |
500 | struct scatterlist *sg_d, *sg_s; | |
501 | void *dst, *src; | |
502 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
503 | u32 length, page_end = 0, table_sg_end; | |
504 | u32 rd_offset = req->rd_offset; | |
505 | ||
506 | table = rd_get_sg_table(dev, req->rd_page); | |
507 | if (!(table)) | |
508 | return -1; | |
509 | ||
510 | table_sg_end = (table->page_end_offset - req->rd_page); | |
511 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; | |
512 | sg_s = task->task_sg; | |
513 | #ifdef DEBUG_RAMDISK_MCP | |
514 | printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u," | |
515 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
516 | req->rd_page, req->rd_offset); | |
517 | #endif | |
518 | dst_offset = rd_offset; | |
519 | ||
520 | while (req->rd_size) { | |
521 | if ((sg_s[i].length - src_offset) < | |
522 | (sg_d[j].length - dst_offset)) { | |
523 | length = (sg_s[i].length - src_offset); | |
524 | #ifdef DEBUG_RAMDISK_MCP | |
525 | printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d" | |
526 | " offset: %d sg_d[%d].length: %u\n", i, | |
527 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
528 | j, sg_d[j].length); | |
529 | printk(KERN_INFO "Step 1 - length: %u src_offset: %u" | |
530 | " dst_offset: %u\n", length, src_offset, | |
531 | dst_offset); | |
532 | #endif | |
533 | if (length > req->rd_size) | |
534 | length = req->rd_size; | |
535 | ||
536 | src = sg_virt(&sg_s[i++]) + src_offset; | |
537 | if (!src) | |
538 | BUG(); | |
539 | ||
540 | dst = sg_virt(&sg_d[j]) + dst_offset; | |
541 | if (!dst) | |
542 | BUG(); | |
543 | ||
544 | src_offset = 0; | |
545 | dst_offset = length; | |
546 | page_end = 0; | |
547 | } else { | |
548 | length = (sg_d[j].length - dst_offset); | |
549 | #ifdef DEBUG_RAMDISK_MCP | |
550 | printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d" | |
551 | " offset: %d sg_d[%d].length: %u\n", i, | |
552 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
553 | j, sg_d[j].length); | |
554 | printk(KERN_INFO "Step 2 - length: %u src_offset: %u" | |
555 | " dst_offset: %u\n", length, src_offset, | |
556 | dst_offset); | |
557 | #endif | |
558 | if (length > req->rd_size) | |
559 | length = req->rd_size; | |
560 | ||
561 | src = sg_virt(&sg_s[i]) + src_offset; | |
562 | if (!src) | |
563 | BUG(); | |
564 | ||
565 | if (sg_s[i].length == length) { | |
566 | i++; | |
567 | src_offset = 0; | |
568 | } else | |
569 | src_offset = length; | |
570 | ||
571 | dst = sg_virt(&sg_d[j++]) + dst_offset; | |
572 | if (!dst) | |
573 | BUG(); | |
574 | ||
575 | dst_offset = 0; | |
576 | page_end = 1; | |
577 | } | |
578 | ||
579 | memcpy(dst, src, length); | |
580 | ||
581 | #ifdef DEBUG_RAMDISK_MCP | |
582 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
583 | " i: %u, j: %u\n", req->rd_page, | |
584 | (req->rd_size - length), length, i, j); | |
585 | #endif | |
586 | req->rd_size -= length; | |
587 | if (!(req->rd_size)) | |
588 | return 0; | |
589 | ||
590 | if (!page_end) | |
591 | continue; | |
592 | ||
593 | if (++req->rd_page <= table->page_end_offset) { | |
594 | #ifdef DEBUG_RAMDISK_MCP | |
595 | printk(KERN_INFO "page: %u in same page table\n", | |
596 | req->rd_page); | |
597 | #endif | |
598 | continue; | |
599 | } | |
600 | #ifdef DEBUG_RAMDISK_MCP | |
601 | printk(KERN_INFO "getting new page table for page: %u\n", | |
602 | req->rd_page); | |
603 | #endif | |
604 | table = rd_get_sg_table(dev, req->rd_page); | |
605 | if (!(table)) | |
606 | return -1; | |
607 | ||
608 | sg_d = &table->sg_table[j = 0]; | |
609 | } | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
615 | * | |
616 | * | |
617 | */ | |
618 | static int rd_MEMCPY_do_task(struct se_task *task) | |
619 | { | |
620 | struct se_device *dev = task->se_dev; | |
621 | struct rd_request *req = RD_REQ(task); | |
622 | unsigned long long lba; | |
623 | int ret; | |
624 | ||
625 | req->rd_page = (task->task_lba * DEV_ATTRIB(dev)->block_size) / PAGE_SIZE; | |
626 | lba = task->task_lba; | |
627 | req->rd_offset = (do_div(lba, | |
628 | (PAGE_SIZE / DEV_ATTRIB(dev)->block_size))) * | |
629 | DEV_ATTRIB(dev)->block_size; | |
630 | req->rd_size = task->task_size; | |
631 | ||
632 | if (task->task_data_direction == DMA_FROM_DEVICE) | |
633 | ret = rd_MEMCPY_read(req); | |
634 | else | |
635 | ret = rd_MEMCPY_write(req); | |
636 | ||
637 | if (ret != 0) | |
638 | return ret; | |
639 | ||
640 | task->task_scsi_status = GOOD; | |
641 | transport_complete_task(task, 1); | |
642 | ||
643 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
644 | } | |
645 | ||
646 | /* rd_DIRECT_with_offset(): | |
647 | * | |
648 | * | |
649 | */ | |
650 | static int rd_DIRECT_with_offset( | |
651 | struct se_task *task, | |
652 | struct list_head *se_mem_list, | |
653 | u32 *se_mem_cnt, | |
654 | u32 *task_offset) | |
655 | { | |
656 | struct rd_request *req = RD_REQ(task); | |
657 | struct rd_dev *dev = req->rd_dev; | |
658 | struct rd_dev_sg_table *table; | |
659 | struct se_mem *se_mem; | |
660 | struct scatterlist *sg_s; | |
661 | u32 j = 0, set_offset = 1; | |
662 | u32 get_next_table = 0, offset_length, table_sg_end; | |
663 | ||
664 | table = rd_get_sg_table(dev, req->rd_page); | |
665 | if (!(table)) | |
666 | return -1; | |
667 | ||
668 | table_sg_end = (table->page_end_offset - req->rd_page); | |
669 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
670 | #ifdef DEBUG_RAMDISK_DR | |
671 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n", | |
672 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
673 | "Write" : "Read", | |
674 | task->task_lba, req->rd_size, req->rd_page, req->rd_offset); | |
675 | #endif | |
676 | while (req->rd_size) { | |
677 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
678 | if (!(se_mem)) { | |
679 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
680 | return -1; | |
681 | } | |
682 | INIT_LIST_HEAD(&se_mem->se_list); | |
683 | ||
684 | if (set_offset) { | |
685 | offset_length = sg_s[j].length - req->rd_offset; | |
686 | if (offset_length > req->rd_size) | |
687 | offset_length = req->rd_size; | |
688 | ||
689 | se_mem->se_page = sg_page(&sg_s[j++]); | |
690 | se_mem->se_off = req->rd_offset; | |
691 | se_mem->se_len = offset_length; | |
692 | ||
693 | set_offset = 0; | |
694 | get_next_table = (j > table_sg_end); | |
695 | goto check_eot; | |
696 | } | |
697 | ||
698 | offset_length = (req->rd_size < req->rd_offset) ? | |
699 | req->rd_size : req->rd_offset; | |
700 | ||
701 | se_mem->se_page = sg_page(&sg_s[j]); | |
702 | se_mem->se_len = offset_length; | |
703 | ||
704 | set_offset = 1; | |
705 | ||
706 | check_eot: | |
707 | #ifdef DEBUG_RAMDISK_DR | |
708 | printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u" | |
709 | " se_mem: %p, se_page: %p se_off: %u se_len: %u\n", | |
710 | req->rd_page, req->rd_size, offset_length, j, se_mem, | |
711 | se_mem->se_page, se_mem->se_off, se_mem->se_len); | |
712 | #endif | |
713 | list_add_tail(&se_mem->se_list, se_mem_list); | |
714 | (*se_mem_cnt)++; | |
715 | ||
716 | req->rd_size -= offset_length; | |
717 | if (!(req->rd_size)) | |
718 | goto out; | |
719 | ||
720 | if (!set_offset && !get_next_table) | |
721 | continue; | |
722 | ||
723 | if (++req->rd_page <= table->page_end_offset) { | |
724 | #ifdef DEBUG_RAMDISK_DR | |
725 | printk(KERN_INFO "page: %u in same page table\n", | |
726 | req->rd_page); | |
727 | #endif | |
728 | continue; | |
729 | } | |
730 | #ifdef DEBUG_RAMDISK_DR | |
731 | printk(KERN_INFO "getting new page table for page: %u\n", | |
732 | req->rd_page); | |
733 | #endif | |
734 | table = rd_get_sg_table(dev, req->rd_page); | |
735 | if (!(table)) | |
736 | return -1; | |
737 | ||
738 | sg_s = &table->sg_table[j = 0]; | |
739 | } | |
740 | ||
741 | out: | |
742 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; | |
743 | #ifdef DEBUG_RAMDISK_DR | |
744 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
745 | *se_mem_cnt); | |
746 | #endif | |
747 | return 0; | |
748 | } | |
749 | ||
750 | /* rd_DIRECT_without_offset(): | |
751 | * | |
752 | * | |
753 | */ | |
754 | static int rd_DIRECT_without_offset( | |
755 | struct se_task *task, | |
756 | struct list_head *se_mem_list, | |
757 | u32 *se_mem_cnt, | |
758 | u32 *task_offset) | |
759 | { | |
760 | struct rd_request *req = RD_REQ(task); | |
761 | struct rd_dev *dev = req->rd_dev; | |
762 | struct rd_dev_sg_table *table; | |
763 | struct se_mem *se_mem; | |
764 | struct scatterlist *sg_s; | |
765 | u32 length, j = 0; | |
766 | ||
767 | table = rd_get_sg_table(dev, req->rd_page); | |
768 | if (!(table)) | |
769 | return -1; | |
770 | ||
771 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
772 | #ifdef DEBUG_RAMDISK_DR | |
773 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n", | |
774 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
775 | "Write" : "Read", | |
776 | task->task_lba, req->rd_size, req->rd_page); | |
777 | #endif | |
778 | while (req->rd_size) { | |
779 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
780 | if (!(se_mem)) { | |
781 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
782 | return -1; | |
783 | } | |
784 | INIT_LIST_HEAD(&se_mem->se_list); | |
785 | ||
786 | length = (req->rd_size < sg_s[j].length) ? | |
787 | req->rd_size : sg_s[j].length; | |
788 | ||
789 | se_mem->se_page = sg_page(&sg_s[j++]); | |
790 | se_mem->se_len = length; | |
791 | ||
792 | #ifdef DEBUG_RAMDISK_DR | |
793 | printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p," | |
794 | " se_page: %p se_off: %u se_len: %u\n", req->rd_page, | |
795 | req->rd_size, j, se_mem, se_mem->se_page, | |
796 | se_mem->se_off, se_mem->se_len); | |
797 | #endif | |
798 | list_add_tail(&se_mem->se_list, se_mem_list); | |
799 | (*se_mem_cnt)++; | |
800 | ||
801 | req->rd_size -= length; | |
802 | if (!(req->rd_size)) | |
803 | goto out; | |
804 | ||
805 | if (++req->rd_page <= table->page_end_offset) { | |
806 | #ifdef DEBUG_RAMDISK_DR | |
807 | printk("page: %u in same page table\n", | |
808 | req->rd_page); | |
809 | #endif | |
810 | continue; | |
811 | } | |
812 | #ifdef DEBUG_RAMDISK_DR | |
813 | printk(KERN_INFO "getting new page table for page: %u\n", | |
814 | req->rd_page); | |
815 | #endif | |
816 | table = rd_get_sg_table(dev, req->rd_page); | |
817 | if (!(table)) | |
818 | return -1; | |
819 | ||
820 | sg_s = &table->sg_table[j = 0]; | |
821 | } | |
822 | ||
823 | out: | |
824 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; | |
825 | #ifdef DEBUG_RAMDISK_DR | |
826 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
827 | *se_mem_cnt); | |
828 | #endif | |
829 | return 0; | |
830 | } | |
831 | ||
832 | /* rd_DIRECT_do_se_mem_map(): | |
833 | * | |
834 | * | |
835 | */ | |
836 | static int rd_DIRECT_do_se_mem_map( | |
837 | struct se_task *task, | |
838 | struct list_head *se_mem_list, | |
839 | void *in_mem, | |
840 | struct se_mem *in_se_mem, | |
841 | struct se_mem **out_se_mem, | |
842 | u32 *se_mem_cnt, | |
843 | u32 *task_offset_in) | |
844 | { | |
845 | struct se_cmd *cmd = task->task_se_cmd; | |
846 | struct rd_request *req = RD_REQ(task); | |
847 | u32 task_offset = *task_offset_in; | |
848 | unsigned long long lba; | |
849 | int ret; | |
850 | ||
851 | req->rd_page = ((task->task_lba * DEV_ATTRIB(task->se_dev)->block_size) / | |
852 | PAGE_SIZE); | |
853 | lba = task->task_lba; | |
854 | req->rd_offset = (do_div(lba, | |
855 | (PAGE_SIZE / DEV_ATTRIB(task->se_dev)->block_size))) * | |
856 | DEV_ATTRIB(task->se_dev)->block_size; | |
857 | req->rd_size = task->task_size; | |
858 | ||
859 | if (req->rd_offset) | |
860 | ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt, | |
861 | task_offset_in); | |
862 | else | |
863 | ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt, | |
864 | task_offset_in); | |
865 | ||
866 | if (ret < 0) | |
867 | return ret; | |
868 | ||
869 | if (CMD_TFO(cmd)->task_sg_chaining == 0) | |
870 | return 0; | |
871 | /* | |
872 | * Currently prevent writers from multiple HW fabrics doing | |
873 | * pci_map_sg() to RD_DR's internal scatterlist memory. | |
874 | */ | |
875 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
876 | printk(KERN_ERR "DMA_TO_DEVICE not supported for" | |
877 | " RAMDISK_DR with task_sg_chaining=1\n"); | |
878 | return -1; | |
879 | } | |
880 | /* | |
881 | * Special case for if task_sg_chaining is enabled, then | |
882 | * we setup struct se_task->task_sg[], as it will be used by | |
883 | * transport_do_task_sg_chain() for creating chainged SGLs | |
884 | * across multiple struct se_task->task_sg[]. | |
885 | */ | |
886 | if (!(transport_calc_sg_num(task, | |
887 | list_entry(T_TASK(cmd)->t_mem_list->next, | |
888 | struct se_mem, se_list), | |
889 | task_offset))) | |
890 | return -1; | |
891 | ||
892 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, | |
893 | list_entry(T_TASK(cmd)->t_mem_list->next, | |
894 | struct se_mem, se_list), | |
895 | out_se_mem, se_mem_cnt, task_offset_in); | |
896 | } | |
897 | ||
898 | /* rd_DIRECT_do_task(): (Part of se_subsystem_api_t template) | |
899 | * | |
900 | * | |
901 | */ | |
902 | static int rd_DIRECT_do_task(struct se_task *task) | |
903 | { | |
904 | /* | |
905 | * At this point the locally allocated RD tables have been mapped | |
906 | * to struct se_mem elements in rd_DIRECT_do_se_mem_map(). | |
907 | */ | |
908 | task->task_scsi_status = GOOD; | |
909 | transport_complete_task(task, 1); | |
910 | ||
911 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
912 | } | |
913 | ||
914 | /* rd_free_task(): (Part of se_subsystem_api_t template) | |
915 | * | |
916 | * | |
917 | */ | |
918 | static void rd_free_task(struct se_task *task) | |
919 | { | |
920 | kfree(RD_REQ(task)); | |
921 | } | |
922 | ||
923 | enum { | |
924 | Opt_rd_pages, Opt_err | |
925 | }; | |
926 | ||
927 | static match_table_t tokens = { | |
928 | {Opt_rd_pages, "rd_pages=%d"}, | |
929 | {Opt_err, NULL} | |
930 | }; | |
931 | ||
932 | static ssize_t rd_set_configfs_dev_params( | |
933 | struct se_hba *hba, | |
934 | struct se_subsystem_dev *se_dev, | |
935 | const char *page, | |
936 | ssize_t count) | |
937 | { | |
938 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
939 | char *orig, *ptr, *opts; | |
940 | substring_t args[MAX_OPT_ARGS]; | |
941 | int ret = 0, arg, token; | |
942 | ||
943 | opts = kstrdup(page, GFP_KERNEL); | |
944 | if (!opts) | |
945 | return -ENOMEM; | |
946 | ||
947 | orig = opts; | |
948 | ||
949 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
950 | if (!*ptr) | |
951 | continue; | |
952 | ||
953 | token = match_token(ptr, tokens, args); | |
954 | switch (token) { | |
955 | case Opt_rd_pages: | |
956 | match_int(args, &arg); | |
957 | rd_dev->rd_page_count = arg; | |
958 | printk(KERN_INFO "RAMDISK: Referencing Page" | |
959 | " Count: %u\n", rd_dev->rd_page_count); | |
960 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
961 | break; | |
962 | default: | |
963 | break; | |
964 | } | |
965 | } | |
966 | ||
967 | kfree(orig); | |
968 | return (!ret) ? count : ret; | |
969 | } | |
970 | ||
971 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
972 | { | |
973 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
974 | ||
975 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
976 | printk(KERN_INFO "Missing rd_pages= parameter\n"); | |
977 | return -1; | |
978 | } | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
983 | static ssize_t rd_show_configfs_dev_params( | |
984 | struct se_hba *hba, | |
985 | struct se_subsystem_dev *se_dev, | |
986 | char *b) | |
987 | { | |
988 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
989 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
990 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
991 | "rd_direct" : "rd_mcp"); | |
992 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
993 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
994 | PAGE_SIZE, rd_dev->sg_table_count); | |
995 | return bl; | |
996 | } | |
997 | ||
998 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) | |
999 | * | |
1000 | * | |
1001 | */ | |
1002 | static unsigned char *rd_get_cdb(struct se_task *task) | |
1003 | { | |
1004 | struct rd_request *req = RD_REQ(task); | |
1005 | ||
1006 | return req->rd_scsi_cdb; | |
1007 | } | |
1008 | ||
1009 | static u32 rd_get_device_rev(struct se_device *dev) | |
1010 | { | |
1011 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
1012 | } | |
1013 | ||
1014 | static u32 rd_get_device_type(struct se_device *dev) | |
1015 | { | |
1016 | return TYPE_DISK; | |
1017 | } | |
1018 | ||
1019 | static sector_t rd_get_blocks(struct se_device *dev) | |
1020 | { | |
1021 | struct rd_dev *rd_dev = dev->dev_ptr; | |
1022 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
1023 | DEV_ATTRIB(dev)->block_size) - 1; | |
1024 | ||
1025 | return blocks_long; | |
1026 | } | |
1027 | ||
1028 | static struct se_subsystem_api rd_dr_template = { | |
1029 | .name = "rd_dr", | |
1030 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1031 | .attach_hba = rd_attach_hba, | |
1032 | .detach_hba = rd_detach_hba, | |
1033 | .allocate_virtdevice = rd_DIRECT_allocate_virtdevice, | |
1034 | .create_virtdevice = rd_DIRECT_create_virtdevice, | |
1035 | .free_device = rd_free_device, | |
1036 | .alloc_task = rd_alloc_task, | |
1037 | .do_task = rd_DIRECT_do_task, | |
1038 | .free_task = rd_free_task, | |
1039 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1040 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1041 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1042 | .get_cdb = rd_get_cdb, | |
1043 | .get_device_rev = rd_get_device_rev, | |
1044 | .get_device_type = rd_get_device_type, | |
1045 | .get_blocks = rd_get_blocks, | |
1046 | .do_se_mem_map = rd_DIRECT_do_se_mem_map, | |
1047 | }; | |
1048 | ||
1049 | static struct se_subsystem_api rd_mcp_template = { | |
1050 | .name = "rd_mcp", | |
1051 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1052 | .attach_hba = rd_attach_hba, | |
1053 | .detach_hba = rd_detach_hba, | |
1054 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
1055 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
1056 | .free_device = rd_free_device, | |
1057 | .alloc_task = rd_alloc_task, | |
1058 | .do_task = rd_MEMCPY_do_task, | |
1059 | .free_task = rd_free_task, | |
1060 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1061 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1062 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1063 | .get_cdb = rd_get_cdb, | |
1064 | .get_device_rev = rd_get_device_rev, | |
1065 | .get_device_type = rd_get_device_type, | |
1066 | .get_blocks = rd_get_blocks, | |
1067 | }; | |
1068 | ||
1069 | int __init rd_module_init(void) | |
1070 | { | |
1071 | int ret; | |
1072 | ||
1073 | ret = transport_subsystem_register(&rd_dr_template); | |
1074 | if (ret < 0) | |
1075 | return ret; | |
1076 | ||
1077 | ret = transport_subsystem_register(&rd_mcp_template); | |
1078 | if (ret < 0) { | |
1079 | transport_subsystem_release(&rd_dr_template); | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | void rd_module_exit(void) | |
1087 | { | |
1088 | transport_subsystem_release(&rd_dr_template); | |
1089 | transport_subsystem_release(&rd_mcp_template); | |
1090 | } |