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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> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <scsi/scsi.h> | |
39 | #include <scsi/scsi_host.h> | |
40 | ||
41 | #include <target/target_core_base.h> | |
42 | #include <target/target_core_device.h> | |
43 | #include <target/target_core_transport.h> | |
44 | #include <target/target_core_fabric_ops.h> | |
45 | ||
46 | #include "target_core_rd.h" | |
47 | ||
48 | static struct se_subsystem_api rd_dr_template; | |
49 | static struct se_subsystem_api rd_mcp_template; | |
50 | ||
51 | /* #define DEBUG_RAMDISK_MCP */ | |
52 | /* #define DEBUG_RAMDISK_DR */ | |
53 | ||
54 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) | |
55 | * | |
56 | * | |
57 | */ | |
58 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
59 | { | |
60 | struct rd_host *rd_host; | |
61 | ||
62 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
63 | if (!(rd_host)) { | |
64 | printk(KERN_ERR "Unable to allocate memory for struct rd_host\n"); | |
65 | return -ENOMEM; | |
66 | } | |
67 | ||
68 | rd_host->rd_host_id = host_id; | |
69 | ||
70 | atomic_set(&hba->left_queue_depth, RD_HBA_QUEUE_DEPTH); | |
71 | atomic_set(&hba->max_queue_depth, RD_HBA_QUEUE_DEPTH); | |
72 | hba->hba_ptr = (void *) rd_host; | |
73 | ||
74 | printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" | |
75 | " Generic Target Core Stack %s\n", hba->hba_id, | |
76 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
77 | printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" | |
78 | " Target Core TCQ Depth: %d MaxSectors: %u\n", hba->hba_id, | |
79 | rd_host->rd_host_id, atomic_read(&hba->max_queue_depth), | |
80 | RD_MAX_SECTORS); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static void rd_detach_hba(struct se_hba *hba) | |
86 | { | |
87 | struct rd_host *rd_host = hba->hba_ptr; | |
88 | ||
89 | printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from" | |
90 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); | |
91 | ||
92 | kfree(rd_host); | |
93 | hba->hba_ptr = NULL; | |
94 | } | |
95 | ||
96 | /* rd_release_device_space(): | |
97 | * | |
98 | * | |
99 | */ | |
100 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
101 | { | |
102 | u32 i, j, page_count = 0, sg_per_table; | |
103 | struct rd_dev_sg_table *sg_table; | |
104 | struct page *pg; | |
105 | struct scatterlist *sg; | |
106 | ||
107 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
108 | return; | |
109 | ||
110 | sg_table = rd_dev->sg_table_array; | |
111 | ||
112 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
113 | sg = sg_table[i].sg_table; | |
114 | sg_per_table = sg_table[i].rd_sg_count; | |
115 | ||
116 | for (j = 0; j < sg_per_table; j++) { | |
117 | pg = sg_page(&sg[j]); | |
118 | if ((pg)) { | |
119 | __free_page(pg); | |
120 | page_count++; | |
121 | } | |
122 | } | |
123 | ||
124 | kfree(sg); | |
125 | } | |
126 | ||
127 | printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk" | |
128 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", | |
129 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
130 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
131 | ||
132 | kfree(sg_table); | |
133 | rd_dev->sg_table_array = NULL; | |
134 | rd_dev->sg_table_count = 0; | |
135 | } | |
136 | ||
137 | ||
138 | /* rd_build_device_space(): | |
139 | * | |
140 | * | |
141 | */ | |
142 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
143 | { | |
144 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
145 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
146 | sizeof(struct scatterlist)); | |
147 | struct rd_dev_sg_table *sg_table; | |
148 | struct page *pg; | |
149 | struct scatterlist *sg; | |
150 | ||
151 | if (rd_dev->rd_page_count <= 0) { | |
152 | printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n", | |
153 | rd_dev->rd_page_count); | |
154 | return -1; | |
155 | } | |
156 | total_sg_needed = rd_dev->rd_page_count; | |
157 | ||
158 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
159 | ||
160 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
161 | if (!(sg_table)) { | |
162 | printk(KERN_ERR "Unable to allocate memory for Ramdisk" | |
163 | " scatterlist tables\n"); | |
164 | return -1; | |
165 | } | |
166 | ||
167 | rd_dev->sg_table_array = sg_table; | |
168 | rd_dev->sg_table_count = sg_tables; | |
169 | ||
170 | while (total_sg_needed) { | |
171 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
172 | max_sg_per_table : total_sg_needed; | |
173 | ||
174 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
175 | GFP_KERNEL); | |
176 | if (!(sg)) { | |
177 | printk(KERN_ERR "Unable to allocate scatterlist array" | |
178 | " for struct rd_dev\n"); | |
179 | return -1; | |
180 | } | |
181 | ||
182 | sg_init_table((struct scatterlist *)&sg[0], sg_per_table); | |
183 | ||
184 | sg_table[i].sg_table = sg; | |
185 | sg_table[i].rd_sg_count = sg_per_table; | |
186 | sg_table[i].page_start_offset = page_offset; | |
187 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
188 | - 1; | |
189 | ||
190 | for (j = 0; j < sg_per_table; j++) { | |
191 | pg = alloc_pages(GFP_KERNEL, 0); | |
192 | if (!(pg)) { | |
193 | printk(KERN_ERR "Unable to allocate scatterlist" | |
194 | " pages for struct rd_dev_sg_table\n"); | |
195 | return -1; | |
196 | } | |
197 | sg_assign_page(&sg[j], pg); | |
198 | sg[j].length = PAGE_SIZE; | |
199 | } | |
200 | ||
201 | page_offset += sg_per_table; | |
202 | total_sg_needed -= sg_per_table; | |
203 | } | |
204 | ||
205 | printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of" | |
206 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, | |
207 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
208 | rd_dev->sg_table_count); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static void *rd_allocate_virtdevice( | |
214 | struct se_hba *hba, | |
215 | const char *name, | |
216 | int rd_direct) | |
217 | { | |
218 | struct rd_dev *rd_dev; | |
219 | struct rd_host *rd_host = hba->hba_ptr; | |
220 | ||
221 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
222 | if (!(rd_dev)) { | |
223 | printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n"); | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | rd_dev->rd_host = rd_host; | |
228 | rd_dev->rd_direct = rd_direct; | |
229 | ||
230 | return rd_dev; | |
231 | } | |
232 | ||
233 | static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name) | |
234 | { | |
235 | return rd_allocate_virtdevice(hba, name, 1); | |
236 | } | |
237 | ||
238 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) | |
239 | { | |
240 | return rd_allocate_virtdevice(hba, name, 0); | |
241 | } | |
242 | ||
243 | /* rd_create_virtdevice(): | |
244 | * | |
245 | * | |
246 | */ | |
247 | static struct se_device *rd_create_virtdevice( | |
248 | struct se_hba *hba, | |
249 | struct se_subsystem_dev *se_dev, | |
250 | void *p, | |
251 | int rd_direct) | |
252 | { | |
253 | struct se_device *dev; | |
254 | struct se_dev_limits dev_limits; | |
255 | struct rd_dev *rd_dev = p; | |
256 | struct rd_host *rd_host = hba->hba_ptr; | |
257 | int dev_flags = 0; | |
258 | char prod[16], rev[4]; | |
259 | ||
260 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
261 | ||
262 | if (rd_build_device_space(rd_dev) < 0) | |
263 | goto fail; | |
264 | ||
265 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); | |
266 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : | |
267 | RD_MCP_VERSION); | |
268 | ||
269 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; | |
270 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; | |
271 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; | |
272 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
273 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; | |
274 | ||
275 | dev = transport_add_device_to_core_hba(hba, | |
276 | (rd_dev->rd_direct) ? &rd_dr_template : | |
277 | &rd_mcp_template, se_dev, dev_flags, (void *)rd_dev, | |
278 | &dev_limits, prod, rev); | |
279 | if (!(dev)) | |
280 | goto fail; | |
281 | ||
282 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
283 | rd_dev->rd_queue_depth = dev->queue_depth; | |
284 | ||
285 | printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" | |
286 | " %u pages in %u tables, %lu total bytes\n", | |
287 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : | |
288 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
289 | rd_dev->sg_table_count, | |
290 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
291 | ||
292 | return dev; | |
293 | ||
294 | fail: | |
295 | rd_release_device_space(rd_dev); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | static struct se_device *rd_DIRECT_create_virtdevice( | |
300 | struct se_hba *hba, | |
301 | struct se_subsystem_dev *se_dev, | |
302 | void *p) | |
303 | { | |
304 | return rd_create_virtdevice(hba, se_dev, p, 1); | |
305 | } | |
306 | ||
307 | static struct se_device *rd_MEMCPY_create_virtdevice( | |
308 | struct se_hba *hba, | |
309 | struct se_subsystem_dev *se_dev, | |
310 | void *p) | |
311 | { | |
312 | return rd_create_virtdevice(hba, se_dev, p, 0); | |
313 | } | |
314 | ||
315 | /* rd_free_device(): (Part of se_subsystem_api_t template) | |
316 | * | |
317 | * | |
318 | */ | |
319 | static void rd_free_device(void *p) | |
320 | { | |
321 | struct rd_dev *rd_dev = p; | |
322 | ||
323 | rd_release_device_space(rd_dev); | |
324 | kfree(rd_dev); | |
325 | } | |
326 | ||
327 | static inline struct rd_request *RD_REQ(struct se_task *task) | |
328 | { | |
329 | return container_of(task, struct rd_request, rd_task); | |
330 | } | |
331 | ||
332 | static struct se_task * | |
333 | rd_alloc_task(struct se_cmd *cmd) | |
334 | { | |
335 | struct rd_request *rd_req; | |
336 | ||
337 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); | |
338 | if (!rd_req) { | |
339 | printk(KERN_ERR "Unable to allocate struct rd_request\n"); | |
340 | return NULL; | |
341 | } | |
342 | rd_req->rd_dev = SE_DEV(cmd)->dev_ptr; | |
343 | ||
344 | return &rd_req->rd_task; | |
345 | } | |
346 | ||
347 | /* rd_get_sg_table(): | |
348 | * | |
349 | * | |
350 | */ | |
351 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) | |
352 | { | |
353 | u32 i; | |
354 | struct rd_dev_sg_table *sg_table; | |
355 | ||
356 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
357 | sg_table = &rd_dev->sg_table_array[i]; | |
358 | if ((sg_table->page_start_offset <= page) && | |
359 | (sg_table->page_end_offset >= page)) | |
360 | return sg_table; | |
361 | } | |
362 | ||
363 | printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n", | |
364 | page); | |
365 | ||
366 | return NULL; | |
367 | } | |
368 | ||
369 | /* rd_MEMCPY_read(): | |
370 | * | |
371 | * | |
372 | */ | |
373 | static int rd_MEMCPY_read(struct rd_request *req) | |
374 | { | |
375 | struct se_task *task = &req->rd_task; | |
376 | struct rd_dev *dev = req->rd_dev; | |
377 | struct rd_dev_sg_table *table; | |
378 | struct scatterlist *sg_d, *sg_s; | |
379 | void *dst, *src; | |
380 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
381 | u32 length, page_end = 0, table_sg_end; | |
382 | u32 rd_offset = req->rd_offset; | |
383 | ||
384 | table = rd_get_sg_table(dev, req->rd_page); | |
385 | if (!(table)) | |
386 | return -1; | |
387 | ||
388 | table_sg_end = (table->page_end_offset - req->rd_page); | |
389 | sg_d = task->task_sg; | |
390 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
391 | #ifdef DEBUG_RAMDISK_MCP | |
392 | printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" | |
393 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
394 | req->rd_page, req->rd_offset); | |
395 | #endif | |
396 | src_offset = rd_offset; | |
397 | ||
398 | while (req->rd_size) { | |
399 | if ((sg_d[i].length - dst_offset) < | |
400 | (sg_s[j].length - src_offset)) { | |
401 | length = (sg_d[i].length - dst_offset); | |
402 | #ifdef DEBUG_RAMDISK_MCP | |
403 | printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d" | |
404 | " offset: %u sg_s[%d].length: %u\n", i, | |
405 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, | |
406 | sg_s[j].length); | |
407 | printk(KERN_INFO "Step 1 - length: %u dst_offset: %u" | |
408 | " src_offset: %u\n", length, dst_offset, | |
409 | src_offset); | |
410 | #endif | |
411 | if (length > req->rd_size) | |
412 | length = req->rd_size; | |
413 | ||
414 | dst = sg_virt(&sg_d[i++]) + dst_offset; | |
415 | if (!dst) | |
416 | BUG(); | |
417 | ||
418 | src = sg_virt(&sg_s[j]) + src_offset; | |
419 | if (!src) | |
420 | BUG(); | |
421 | ||
422 | dst_offset = 0; | |
423 | src_offset = length; | |
424 | page_end = 0; | |
425 | } else { | |
426 | length = (sg_s[j].length - src_offset); | |
427 | #ifdef DEBUG_RAMDISK_MCP | |
428 | printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d" | |
429 | " offset: %u sg_s[%d].length: %u\n", i, | |
430 | &sg_d[i], sg_d[i].length, sg_d[i].offset, | |
431 | j, sg_s[j].length); | |
432 | printk(KERN_INFO "Step 2 - length: %u dst_offset: %u" | |
433 | " src_offset: %u\n", length, dst_offset, | |
434 | src_offset); | |
435 | #endif | |
436 | if (length > req->rd_size) | |
437 | length = req->rd_size; | |
438 | ||
439 | dst = sg_virt(&sg_d[i]) + dst_offset; | |
440 | if (!dst) | |
441 | BUG(); | |
442 | ||
443 | if (sg_d[i].length == length) { | |
444 | i++; | |
445 | dst_offset = 0; | |
446 | } else | |
447 | dst_offset = length; | |
448 | ||
449 | src = sg_virt(&sg_s[j++]) + src_offset; | |
450 | if (!src) | |
451 | BUG(); | |
452 | ||
453 | src_offset = 0; | |
454 | page_end = 1; | |
455 | } | |
456 | ||
457 | memcpy(dst, src, length); | |
458 | ||
459 | #ifdef DEBUG_RAMDISK_MCP | |
460 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
461 | " i: %u, j: %u\n", req->rd_page, | |
462 | (req->rd_size - length), length, i, j); | |
463 | #endif | |
464 | req->rd_size -= length; | |
465 | if (!(req->rd_size)) | |
466 | return 0; | |
467 | ||
468 | if (!page_end) | |
469 | continue; | |
470 | ||
471 | if (++req->rd_page <= table->page_end_offset) { | |
472 | #ifdef DEBUG_RAMDISK_MCP | |
473 | printk(KERN_INFO "page: %u in same page table\n", | |
474 | req->rd_page); | |
475 | #endif | |
476 | continue; | |
477 | } | |
478 | #ifdef DEBUG_RAMDISK_MCP | |
479 | printk(KERN_INFO "getting new page table for page: %u\n", | |
480 | req->rd_page); | |
481 | #endif | |
482 | table = rd_get_sg_table(dev, req->rd_page); | |
483 | if (!(table)) | |
484 | return -1; | |
485 | ||
486 | sg_s = &table->sg_table[j = 0]; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | /* rd_MEMCPY_write(): | |
493 | * | |
494 | * | |
495 | */ | |
496 | static int rd_MEMCPY_write(struct rd_request *req) | |
497 | { | |
498 | struct se_task *task = &req->rd_task; | |
499 | struct rd_dev *dev = req->rd_dev; | |
500 | struct rd_dev_sg_table *table; | |
501 | struct scatterlist *sg_d, *sg_s; | |
502 | void *dst, *src; | |
503 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; | |
504 | u32 length, page_end = 0, table_sg_end; | |
505 | u32 rd_offset = req->rd_offset; | |
506 | ||
507 | table = rd_get_sg_table(dev, req->rd_page); | |
508 | if (!(table)) | |
509 | return -1; | |
510 | ||
511 | table_sg_end = (table->page_end_offset - req->rd_page); | |
512 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; | |
513 | sg_s = task->task_sg; | |
514 | #ifdef DEBUG_RAMDISK_MCP | |
515 | printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u," | |
516 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, | |
517 | req->rd_page, req->rd_offset); | |
518 | #endif | |
519 | dst_offset = rd_offset; | |
520 | ||
521 | while (req->rd_size) { | |
522 | if ((sg_s[i].length - src_offset) < | |
523 | (sg_d[j].length - dst_offset)) { | |
524 | length = (sg_s[i].length - src_offset); | |
525 | #ifdef DEBUG_RAMDISK_MCP | |
526 | printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d" | |
527 | " offset: %d sg_d[%d].length: %u\n", i, | |
528 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
529 | j, sg_d[j].length); | |
530 | printk(KERN_INFO "Step 1 - length: %u src_offset: %u" | |
531 | " dst_offset: %u\n", length, src_offset, | |
532 | dst_offset); | |
533 | #endif | |
534 | if (length > req->rd_size) | |
535 | length = req->rd_size; | |
536 | ||
537 | src = sg_virt(&sg_s[i++]) + src_offset; | |
538 | if (!src) | |
539 | BUG(); | |
540 | ||
541 | dst = sg_virt(&sg_d[j]) + dst_offset; | |
542 | if (!dst) | |
543 | BUG(); | |
544 | ||
545 | src_offset = 0; | |
546 | dst_offset = length; | |
547 | page_end = 0; | |
548 | } else { | |
549 | length = (sg_d[j].length - dst_offset); | |
550 | #ifdef DEBUG_RAMDISK_MCP | |
551 | printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d" | |
552 | " offset: %d sg_d[%d].length: %u\n", i, | |
553 | &sg_s[i], sg_s[i].length, sg_s[i].offset, | |
554 | j, sg_d[j].length); | |
555 | printk(KERN_INFO "Step 2 - length: %u src_offset: %u" | |
556 | " dst_offset: %u\n", length, src_offset, | |
557 | dst_offset); | |
558 | #endif | |
559 | if (length > req->rd_size) | |
560 | length = req->rd_size; | |
561 | ||
562 | src = sg_virt(&sg_s[i]) + src_offset; | |
563 | if (!src) | |
564 | BUG(); | |
565 | ||
566 | if (sg_s[i].length == length) { | |
567 | i++; | |
568 | src_offset = 0; | |
569 | } else | |
570 | src_offset = length; | |
571 | ||
572 | dst = sg_virt(&sg_d[j++]) + dst_offset; | |
573 | if (!dst) | |
574 | BUG(); | |
575 | ||
576 | dst_offset = 0; | |
577 | page_end = 1; | |
578 | } | |
579 | ||
580 | memcpy(dst, src, length); | |
581 | ||
582 | #ifdef DEBUG_RAMDISK_MCP | |
583 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," | |
584 | " i: %u, j: %u\n", req->rd_page, | |
585 | (req->rd_size - length), length, i, j); | |
586 | #endif | |
587 | req->rd_size -= length; | |
588 | if (!(req->rd_size)) | |
589 | return 0; | |
590 | ||
591 | if (!page_end) | |
592 | continue; | |
593 | ||
594 | if (++req->rd_page <= table->page_end_offset) { | |
595 | #ifdef DEBUG_RAMDISK_MCP | |
596 | printk(KERN_INFO "page: %u in same page table\n", | |
597 | req->rd_page); | |
598 | #endif | |
599 | continue; | |
600 | } | |
601 | #ifdef DEBUG_RAMDISK_MCP | |
602 | printk(KERN_INFO "getting new page table for page: %u\n", | |
603 | req->rd_page); | |
604 | #endif | |
605 | table = rd_get_sg_table(dev, req->rd_page); | |
606 | if (!(table)) | |
607 | return -1; | |
608 | ||
609 | sg_d = &table->sg_table[j = 0]; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) | |
616 | * | |
617 | * | |
618 | */ | |
619 | static int rd_MEMCPY_do_task(struct se_task *task) | |
620 | { | |
621 | struct se_device *dev = task->se_dev; | |
622 | struct rd_request *req = RD_REQ(task); | |
623 | unsigned long long lba; | |
624 | int ret; | |
625 | ||
626 | req->rd_page = (task->task_lba * DEV_ATTRIB(dev)->block_size) / PAGE_SIZE; | |
627 | lba = task->task_lba; | |
628 | req->rd_offset = (do_div(lba, | |
629 | (PAGE_SIZE / DEV_ATTRIB(dev)->block_size))) * | |
630 | DEV_ATTRIB(dev)->block_size; | |
631 | req->rd_size = task->task_size; | |
632 | ||
633 | if (task->task_data_direction == DMA_FROM_DEVICE) | |
634 | ret = rd_MEMCPY_read(req); | |
635 | else | |
636 | ret = rd_MEMCPY_write(req); | |
637 | ||
638 | if (ret != 0) | |
639 | return ret; | |
640 | ||
641 | task->task_scsi_status = GOOD; | |
642 | transport_complete_task(task, 1); | |
643 | ||
644 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
645 | } | |
646 | ||
647 | /* rd_DIRECT_with_offset(): | |
648 | * | |
649 | * | |
650 | */ | |
651 | static int rd_DIRECT_with_offset( | |
652 | struct se_task *task, | |
653 | struct list_head *se_mem_list, | |
654 | u32 *se_mem_cnt, | |
655 | u32 *task_offset) | |
656 | { | |
657 | struct rd_request *req = RD_REQ(task); | |
658 | struct rd_dev *dev = req->rd_dev; | |
659 | struct rd_dev_sg_table *table; | |
660 | struct se_mem *se_mem; | |
661 | struct scatterlist *sg_s; | |
662 | u32 j = 0, set_offset = 1; | |
663 | u32 get_next_table = 0, offset_length, table_sg_end; | |
664 | ||
665 | table = rd_get_sg_table(dev, req->rd_page); | |
666 | if (!(table)) | |
667 | return -1; | |
668 | ||
669 | table_sg_end = (table->page_end_offset - req->rd_page); | |
670 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
671 | #ifdef DEBUG_RAMDISK_DR | |
672 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n", | |
673 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
674 | "Write" : "Read", | |
675 | task->task_lba, req->rd_size, req->rd_page, req->rd_offset); | |
676 | #endif | |
677 | while (req->rd_size) { | |
678 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
679 | if (!(se_mem)) { | |
680 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
681 | return -1; | |
682 | } | |
683 | INIT_LIST_HEAD(&se_mem->se_list); | |
684 | ||
685 | if (set_offset) { | |
686 | offset_length = sg_s[j].length - req->rd_offset; | |
687 | if (offset_length > req->rd_size) | |
688 | offset_length = req->rd_size; | |
689 | ||
690 | se_mem->se_page = sg_page(&sg_s[j++]); | |
691 | se_mem->se_off = req->rd_offset; | |
692 | se_mem->se_len = offset_length; | |
693 | ||
694 | set_offset = 0; | |
695 | get_next_table = (j > table_sg_end); | |
696 | goto check_eot; | |
697 | } | |
698 | ||
699 | offset_length = (req->rd_size < req->rd_offset) ? | |
700 | req->rd_size : req->rd_offset; | |
701 | ||
702 | se_mem->se_page = sg_page(&sg_s[j]); | |
703 | se_mem->se_len = offset_length; | |
704 | ||
705 | set_offset = 1; | |
706 | ||
707 | check_eot: | |
708 | #ifdef DEBUG_RAMDISK_DR | |
709 | printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u" | |
710 | " se_mem: %p, se_page: %p se_off: %u se_len: %u\n", | |
711 | req->rd_page, req->rd_size, offset_length, j, se_mem, | |
712 | se_mem->se_page, se_mem->se_off, se_mem->se_len); | |
713 | #endif | |
714 | list_add_tail(&se_mem->se_list, se_mem_list); | |
715 | (*se_mem_cnt)++; | |
716 | ||
717 | req->rd_size -= offset_length; | |
718 | if (!(req->rd_size)) | |
719 | goto out; | |
720 | ||
721 | if (!set_offset && !get_next_table) | |
722 | continue; | |
723 | ||
724 | if (++req->rd_page <= table->page_end_offset) { | |
725 | #ifdef DEBUG_RAMDISK_DR | |
726 | printk(KERN_INFO "page: %u in same page table\n", | |
727 | req->rd_page); | |
728 | #endif | |
729 | continue; | |
730 | } | |
731 | #ifdef DEBUG_RAMDISK_DR | |
732 | printk(KERN_INFO "getting new page table for page: %u\n", | |
733 | req->rd_page); | |
734 | #endif | |
735 | table = rd_get_sg_table(dev, req->rd_page); | |
736 | if (!(table)) | |
737 | return -1; | |
738 | ||
739 | sg_s = &table->sg_table[j = 0]; | |
740 | } | |
741 | ||
742 | out: | |
743 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; | |
744 | #ifdef DEBUG_RAMDISK_DR | |
745 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
746 | *se_mem_cnt); | |
747 | #endif | |
748 | return 0; | |
749 | } | |
750 | ||
751 | /* rd_DIRECT_without_offset(): | |
752 | * | |
753 | * | |
754 | */ | |
755 | static int rd_DIRECT_without_offset( | |
756 | struct se_task *task, | |
757 | struct list_head *se_mem_list, | |
758 | u32 *se_mem_cnt, | |
759 | u32 *task_offset) | |
760 | { | |
761 | struct rd_request *req = RD_REQ(task); | |
762 | struct rd_dev *dev = req->rd_dev; | |
763 | struct rd_dev_sg_table *table; | |
764 | struct se_mem *se_mem; | |
765 | struct scatterlist *sg_s; | |
766 | u32 length, j = 0; | |
767 | ||
768 | table = rd_get_sg_table(dev, req->rd_page); | |
769 | if (!(table)) | |
770 | return -1; | |
771 | ||
772 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; | |
773 | #ifdef DEBUG_RAMDISK_DR | |
774 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n", | |
775 | (task->task_data_direction == DMA_TO_DEVICE) ? | |
776 | "Write" : "Read", | |
777 | task->task_lba, req->rd_size, req->rd_page); | |
778 | #endif | |
779 | while (req->rd_size) { | |
780 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); | |
781 | if (!(se_mem)) { | |
782 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); | |
783 | return -1; | |
784 | } | |
785 | INIT_LIST_HEAD(&se_mem->se_list); | |
786 | ||
787 | length = (req->rd_size < sg_s[j].length) ? | |
788 | req->rd_size : sg_s[j].length; | |
789 | ||
790 | se_mem->se_page = sg_page(&sg_s[j++]); | |
791 | se_mem->se_len = length; | |
792 | ||
793 | #ifdef DEBUG_RAMDISK_DR | |
794 | printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p," | |
795 | " se_page: %p se_off: %u se_len: %u\n", req->rd_page, | |
796 | req->rd_size, j, se_mem, se_mem->se_page, | |
797 | se_mem->se_off, se_mem->se_len); | |
798 | #endif | |
799 | list_add_tail(&se_mem->se_list, se_mem_list); | |
800 | (*se_mem_cnt)++; | |
801 | ||
802 | req->rd_size -= length; | |
803 | if (!(req->rd_size)) | |
804 | goto out; | |
805 | ||
806 | if (++req->rd_page <= table->page_end_offset) { | |
807 | #ifdef DEBUG_RAMDISK_DR | |
808 | printk("page: %u in same page table\n", | |
809 | req->rd_page); | |
810 | #endif | |
811 | continue; | |
812 | } | |
813 | #ifdef DEBUG_RAMDISK_DR | |
814 | printk(KERN_INFO "getting new page table for page: %u\n", | |
815 | req->rd_page); | |
816 | #endif | |
817 | table = rd_get_sg_table(dev, req->rd_page); | |
818 | if (!(table)) | |
819 | return -1; | |
820 | ||
821 | sg_s = &table->sg_table[j = 0]; | |
822 | } | |
823 | ||
824 | out: | |
825 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; | |
826 | #ifdef DEBUG_RAMDISK_DR | |
827 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", | |
828 | *se_mem_cnt); | |
829 | #endif | |
830 | return 0; | |
831 | } | |
832 | ||
833 | /* rd_DIRECT_do_se_mem_map(): | |
834 | * | |
835 | * | |
836 | */ | |
837 | static int rd_DIRECT_do_se_mem_map( | |
838 | struct se_task *task, | |
839 | struct list_head *se_mem_list, | |
840 | void *in_mem, | |
841 | struct se_mem *in_se_mem, | |
842 | struct se_mem **out_se_mem, | |
843 | u32 *se_mem_cnt, | |
844 | u32 *task_offset_in) | |
845 | { | |
846 | struct se_cmd *cmd = task->task_se_cmd; | |
847 | struct rd_request *req = RD_REQ(task); | |
848 | u32 task_offset = *task_offset_in; | |
849 | unsigned long long lba; | |
850 | int ret; | |
851 | ||
852 | req->rd_page = ((task->task_lba * DEV_ATTRIB(task->se_dev)->block_size) / | |
853 | PAGE_SIZE); | |
854 | lba = task->task_lba; | |
855 | req->rd_offset = (do_div(lba, | |
856 | (PAGE_SIZE / DEV_ATTRIB(task->se_dev)->block_size))) * | |
857 | DEV_ATTRIB(task->se_dev)->block_size; | |
858 | req->rd_size = task->task_size; | |
859 | ||
860 | if (req->rd_offset) | |
861 | ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt, | |
862 | task_offset_in); | |
863 | else | |
864 | ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt, | |
865 | task_offset_in); | |
866 | ||
867 | if (ret < 0) | |
868 | return ret; | |
869 | ||
870 | if (CMD_TFO(cmd)->task_sg_chaining == 0) | |
871 | return 0; | |
872 | /* | |
873 | * Currently prevent writers from multiple HW fabrics doing | |
874 | * pci_map_sg() to RD_DR's internal scatterlist memory. | |
875 | */ | |
876 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
877 | printk(KERN_ERR "DMA_TO_DEVICE not supported for" | |
878 | " RAMDISK_DR with task_sg_chaining=1\n"); | |
879 | return -1; | |
880 | } | |
881 | /* | |
882 | * Special case for if task_sg_chaining is enabled, then | |
883 | * we setup struct se_task->task_sg[], as it will be used by | |
884 | * transport_do_task_sg_chain() for creating chainged SGLs | |
885 | * across multiple struct se_task->task_sg[]. | |
886 | */ | |
887 | if (!(transport_calc_sg_num(task, | |
888 | list_entry(T_TASK(cmd)->t_mem_list->next, | |
889 | struct se_mem, se_list), | |
890 | task_offset))) | |
891 | return -1; | |
892 | ||
893 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, | |
894 | list_entry(T_TASK(cmd)->t_mem_list->next, | |
895 | struct se_mem, se_list), | |
896 | out_se_mem, se_mem_cnt, task_offset_in); | |
897 | } | |
898 | ||
899 | /* rd_DIRECT_do_task(): (Part of se_subsystem_api_t template) | |
900 | * | |
901 | * | |
902 | */ | |
903 | static int rd_DIRECT_do_task(struct se_task *task) | |
904 | { | |
905 | /* | |
906 | * At this point the locally allocated RD tables have been mapped | |
907 | * to struct se_mem elements in rd_DIRECT_do_se_mem_map(). | |
908 | */ | |
909 | task->task_scsi_status = GOOD; | |
910 | transport_complete_task(task, 1); | |
911 | ||
912 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; | |
913 | } | |
914 | ||
915 | /* rd_free_task(): (Part of se_subsystem_api_t template) | |
916 | * | |
917 | * | |
918 | */ | |
919 | static void rd_free_task(struct se_task *task) | |
920 | { | |
921 | kfree(RD_REQ(task)); | |
922 | } | |
923 | ||
924 | enum { | |
925 | Opt_rd_pages, Opt_err | |
926 | }; | |
927 | ||
928 | static match_table_t tokens = { | |
929 | {Opt_rd_pages, "rd_pages=%d"}, | |
930 | {Opt_err, NULL} | |
931 | }; | |
932 | ||
933 | static ssize_t rd_set_configfs_dev_params( | |
934 | struct se_hba *hba, | |
935 | struct se_subsystem_dev *se_dev, | |
936 | const char *page, | |
937 | ssize_t count) | |
938 | { | |
939 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
940 | char *orig, *ptr, *opts; | |
941 | substring_t args[MAX_OPT_ARGS]; | |
942 | int ret = 0, arg, token; | |
943 | ||
944 | opts = kstrdup(page, GFP_KERNEL); | |
945 | if (!opts) | |
946 | return -ENOMEM; | |
947 | ||
948 | orig = opts; | |
949 | ||
950 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
951 | if (!*ptr) | |
952 | continue; | |
953 | ||
954 | token = match_token(ptr, tokens, args); | |
955 | switch (token) { | |
956 | case Opt_rd_pages: | |
957 | match_int(args, &arg); | |
958 | rd_dev->rd_page_count = arg; | |
959 | printk(KERN_INFO "RAMDISK: Referencing Page" | |
960 | " Count: %u\n", rd_dev->rd_page_count); | |
961 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
962 | break; | |
963 | default: | |
964 | break; | |
965 | } | |
966 | } | |
967 | ||
968 | kfree(orig); | |
969 | return (!ret) ? count : ret; | |
970 | } | |
971 | ||
972 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
973 | { | |
974 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
975 | ||
976 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { | |
977 | printk(KERN_INFO "Missing rd_pages= parameter\n"); | |
978 | return -1; | |
979 | } | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | static ssize_t rd_show_configfs_dev_params( | |
985 | struct se_hba *hba, | |
986 | struct se_subsystem_dev *se_dev, | |
987 | char *b) | |
988 | { | |
989 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; | |
990 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", | |
991 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? | |
992 | "rd_direct" : "rd_mcp"); | |
993 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" | |
994 | " SG_table_count: %u\n", rd_dev->rd_page_count, | |
995 | PAGE_SIZE, rd_dev->sg_table_count); | |
996 | return bl; | |
997 | } | |
998 | ||
999 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) | |
1000 | * | |
1001 | * | |
1002 | */ | |
1003 | static unsigned char *rd_get_cdb(struct se_task *task) | |
1004 | { | |
1005 | struct rd_request *req = RD_REQ(task); | |
1006 | ||
1007 | return req->rd_scsi_cdb; | |
1008 | } | |
1009 | ||
1010 | static u32 rd_get_device_rev(struct se_device *dev) | |
1011 | { | |
1012 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
1013 | } | |
1014 | ||
1015 | static u32 rd_get_device_type(struct se_device *dev) | |
1016 | { | |
1017 | return TYPE_DISK; | |
1018 | } | |
1019 | ||
1020 | static sector_t rd_get_blocks(struct se_device *dev) | |
1021 | { | |
1022 | struct rd_dev *rd_dev = dev->dev_ptr; | |
1023 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / | |
1024 | DEV_ATTRIB(dev)->block_size) - 1; | |
1025 | ||
1026 | return blocks_long; | |
1027 | } | |
1028 | ||
1029 | static struct se_subsystem_api rd_dr_template = { | |
1030 | .name = "rd_dr", | |
1031 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1032 | .attach_hba = rd_attach_hba, | |
1033 | .detach_hba = rd_detach_hba, | |
1034 | .allocate_virtdevice = rd_DIRECT_allocate_virtdevice, | |
1035 | .create_virtdevice = rd_DIRECT_create_virtdevice, | |
1036 | .free_device = rd_free_device, | |
1037 | .alloc_task = rd_alloc_task, | |
1038 | .do_task = rd_DIRECT_do_task, | |
1039 | .free_task = rd_free_task, | |
1040 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1041 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1042 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1043 | .get_cdb = rd_get_cdb, | |
1044 | .get_device_rev = rd_get_device_rev, | |
1045 | .get_device_type = rd_get_device_type, | |
1046 | .get_blocks = rd_get_blocks, | |
1047 | .do_se_mem_map = rd_DIRECT_do_se_mem_map, | |
1048 | }; | |
1049 | ||
1050 | static struct se_subsystem_api rd_mcp_template = { | |
1051 | .name = "rd_mcp", | |
1052 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, | |
1053 | .attach_hba = rd_attach_hba, | |
1054 | .detach_hba = rd_detach_hba, | |
1055 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, | |
1056 | .create_virtdevice = rd_MEMCPY_create_virtdevice, | |
1057 | .free_device = rd_free_device, | |
1058 | .alloc_task = rd_alloc_task, | |
1059 | .do_task = rd_MEMCPY_do_task, | |
1060 | .free_task = rd_free_task, | |
1061 | .check_configfs_dev_params = rd_check_configfs_dev_params, | |
1062 | .set_configfs_dev_params = rd_set_configfs_dev_params, | |
1063 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
1064 | .get_cdb = rd_get_cdb, | |
1065 | .get_device_rev = rd_get_device_rev, | |
1066 | .get_device_type = rd_get_device_type, | |
1067 | .get_blocks = rd_get_blocks, | |
1068 | }; | |
1069 | ||
1070 | int __init rd_module_init(void) | |
1071 | { | |
1072 | int ret; | |
1073 | ||
1074 | ret = transport_subsystem_register(&rd_dr_template); | |
1075 | if (ret < 0) | |
1076 | return ret; | |
1077 | ||
1078 | ret = transport_subsystem_register(&rd_mcp_template); | |
1079 | if (ret < 0) { | |
1080 | transport_subsystem_release(&rd_dr_template); | |
1081 | return ret; | |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | void rd_module_exit(void) | |
1088 | { | |
1089 | transport_subsystem_release(&rd_dr_template); | |
1090 | transport_subsystem_release(&rd_mcp_template); | |
1091 | } |