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7c9e7a6f AG |
1 | /* |
2 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
3 | * Copyright (C) 2014 Red Hat, Inc. | |
f97ec7db | 4 | * Copyright (C) 2015 Arrikto, Inc. |
7c9e7a6f AG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #include <linux/spinlock.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/idr.h> | |
ba929992 | 23 | #include <linux/kernel.h> |
7c9e7a6f AG |
24 | #include <linux/timer.h> |
25 | #include <linux/parser.h> | |
5538d294 | 26 | #include <linux/vmalloc.h> |
7c9e7a6f AG |
27 | #include <linux/uio_driver.h> |
28 | #include <net/genetlink.h> | |
ba929992 BVA |
29 | #include <scsi/scsi_common.h> |
30 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
31 | #include <target/target_core_base.h> |
32 | #include <target/target_core_fabric.h> | |
33 | #include <target/target_core_backend.h> | |
e9f720d6 | 34 | |
7c9e7a6f AG |
35 | #include <linux/target_core_user.h> |
36 | ||
37 | /* | |
38 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
39 | * data to userspace for processing. This is to allow backends that | |
40 | * are too complex for in-kernel support to be possible. | |
41 | * | |
42 | * It uses the UIO framework to do a lot of the device-creation and | |
43 | * introspection work for us. | |
44 | * | |
45 | * See the .h file for how the ring is laid out. Note that while the | |
46 | * command ring is defined, the particulars of the data area are | |
47 | * not. Offset values in the command entry point to other locations | |
48 | * internal to the mmap()ed area. There is separate space outside the | |
49 | * command ring for data buffers. This leaves maximum flexibility for | |
50 | * moving buffer allocations, or even page flipping or other | |
51 | * allocation techniques, without altering the command ring layout. | |
52 | * | |
53 | * SECURITY: | |
54 | * The user process must be assumed to be malicious. There's no way to | |
55 | * prevent it breaking the command ring protocol if it wants, but in | |
56 | * order to prevent other issues we must only ever read *data* from | |
57 | * the shared memory area, not offsets or sizes. This applies to | |
58 | * command ring entries as well as the mailbox. Extra code needed for | |
59 | * this may have a 'UAM' comment. | |
60 | */ | |
61 | ||
62 | ||
63 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) | |
64 | ||
65 | #define CMDR_SIZE (16 * 4096) | |
66 | #define DATA_SIZE (257 * 4096) | |
67 | ||
68 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) | |
69 | ||
70 | static struct device *tcmu_root_device; | |
71 | ||
72 | struct tcmu_hba { | |
73 | u32 host_id; | |
74 | }; | |
75 | ||
7c9e7a6f AG |
76 | #define TCMU_CONFIG_LEN 256 |
77 | ||
78 | struct tcmu_dev { | |
79 | struct se_device se_dev; | |
80 | ||
81 | char *name; | |
82 | struct se_hba *hba; | |
83 | ||
84 | #define TCMU_DEV_BIT_OPEN 0 | |
85 | #define TCMU_DEV_BIT_BROKEN 1 | |
86 | unsigned long flags; | |
7c9e7a6f AG |
87 | |
88 | struct uio_info uio_info; | |
89 | ||
90 | struct tcmu_mailbox *mb_addr; | |
91 | size_t dev_size; | |
92 | u32 cmdr_size; | |
93 | u32 cmdr_last_cleaned; | |
94 | /* Offset of data ring from start of mb */ | |
95 | size_t data_off; | |
96 | size_t data_size; | |
97 | /* Ring head + tail values. */ | |
98 | /* Must add data_off and mb_addr to get the address */ | |
99 | size_t data_head; | |
100 | size_t data_tail; | |
101 | ||
102 | wait_queue_head_t wait_cmdr; | |
103 | /* TODO should this be a mutex? */ | |
104 | spinlock_t cmdr_lock; | |
105 | ||
106 | struct idr commands; | |
107 | spinlock_t commands_lock; | |
108 | ||
109 | struct timer_list timeout; | |
110 | ||
111 | char dev_config[TCMU_CONFIG_LEN]; | |
112 | }; | |
113 | ||
114 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
115 | ||
116 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
117 | ||
118 | struct tcmu_cmd { | |
119 | struct se_cmd *se_cmd; | |
120 | struct tcmu_dev *tcmu_dev; | |
121 | ||
122 | uint16_t cmd_id; | |
123 | ||
124 | /* Can't use se_cmd->data_length when cleaning up expired cmds, because if | |
125 | cmd has been completed then accessing se_cmd is off limits */ | |
126 | size_t data_length; | |
127 | ||
128 | unsigned long deadline; | |
129 | ||
130 | #define TCMU_CMD_BIT_EXPIRED 0 | |
131 | unsigned long flags; | |
132 | }; | |
133 | ||
134 | static struct kmem_cache *tcmu_cmd_cache; | |
135 | ||
136 | /* multicast group */ | |
137 | enum tcmu_multicast_groups { | |
138 | TCMU_MCGRP_CONFIG, | |
139 | }; | |
140 | ||
141 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
142 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
143 | }; | |
144 | ||
145 | /* Our generic netlink family */ | |
146 | static struct genl_family tcmu_genl_family = { | |
147 | .id = GENL_ID_GENERATE, | |
148 | .hdrsize = 0, | |
149 | .name = "TCM-USER", | |
150 | .version = 1, | |
151 | .maxattr = TCMU_ATTR_MAX, | |
152 | .mcgrps = tcmu_mcgrps, | |
153 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
154 | }; | |
155 | ||
156 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) | |
157 | { | |
158 | struct se_device *se_dev = se_cmd->se_dev; | |
159 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
160 | struct tcmu_cmd *tcmu_cmd; | |
161 | int cmd_id; | |
162 | ||
163 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
164 | if (!tcmu_cmd) | |
165 | return NULL; | |
166 | ||
167 | tcmu_cmd->se_cmd = se_cmd; | |
168 | tcmu_cmd->tcmu_dev = udev; | |
169 | tcmu_cmd->data_length = se_cmd->data_length; | |
170 | ||
e4648b01 IT |
171 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
172 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
173 | tcmu_cmd->data_length += se_cmd->t_bidi_data_sg->length; | |
174 | } | |
175 | ||
7c9e7a6f AG |
176 | tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); |
177 | ||
178 | idr_preload(GFP_KERNEL); | |
179 | spin_lock_irq(&udev->commands_lock); | |
180 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
181 | USHRT_MAX, GFP_NOWAIT); | |
182 | spin_unlock_irq(&udev->commands_lock); | |
183 | idr_preload_end(); | |
184 | ||
185 | if (cmd_id < 0) { | |
186 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
187 | return NULL; | |
188 | } | |
189 | tcmu_cmd->cmd_id = cmd_id; | |
190 | ||
191 | return tcmu_cmd; | |
192 | } | |
193 | ||
194 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
195 | { | |
196 | unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; | |
197 | ||
198 | size = round_up(size+offset, PAGE_SIZE); | |
199 | vaddr -= offset; | |
200 | ||
201 | while (size) { | |
202 | flush_dcache_page(virt_to_page(vaddr)); | |
203 | size -= PAGE_SIZE; | |
204 | } | |
205 | } | |
206 | ||
207 | /* | |
208 | * Some ring helper functions. We don't assume size is a power of 2 so | |
209 | * we can't use circ_buf.h. | |
210 | */ | |
211 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
212 | { | |
213 | int diff = head - tail; | |
214 | ||
215 | if (diff >= 0) | |
216 | return diff; | |
217 | else | |
218 | return size + diff; | |
219 | } | |
220 | ||
221 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
222 | { | |
223 | /* Keep 1 byte unused or we can't tell full from empty */ | |
224 | return (size - spc_used(head, tail, size) - 1); | |
225 | } | |
226 | ||
227 | static inline size_t head_to_end(size_t head, size_t size) | |
228 | { | |
229 | return size - head; | |
230 | } | |
231 | ||
232 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) | |
233 | ||
f97ec7db IT |
234 | static void alloc_and_scatter_data_area(struct tcmu_dev *udev, |
235 | struct scatterlist *data_sg, unsigned int data_nents, | |
236 | struct iovec **iov, int *iov_cnt, bool copy_data) | |
237 | { | |
238 | int i; | |
239 | void *from, *to; | |
240 | size_t copy_bytes; | |
241 | struct scatterlist *sg; | |
242 | ||
243 | for_each_sg(data_sg, sg, data_nents, i) { | |
244 | copy_bytes = min_t(size_t, sg->length, | |
245 | head_to_end(udev->data_head, udev->data_size)); | |
246 | from = kmap_atomic(sg_page(sg)) + sg->offset; | |
247 | to = (void *) udev->mb_addr + udev->data_off + udev->data_head; | |
248 | ||
249 | if (copy_data) { | |
250 | memcpy(to, from, copy_bytes); | |
251 | tcmu_flush_dcache_range(to, copy_bytes); | |
252 | } | |
253 | ||
254 | /* Even iov_base is relative to mb_addr */ | |
255 | (*iov)->iov_len = copy_bytes; | |
256 | (*iov)->iov_base = (void __user *) udev->data_off + | |
257 | udev->data_head; | |
258 | (*iov_cnt)++; | |
259 | (*iov)++; | |
260 | ||
261 | UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); | |
262 | ||
263 | /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ | |
264 | if (sg->length != copy_bytes) { | |
e2e21bd8 SG |
265 | void *from_skip = from + copy_bytes; |
266 | ||
f97ec7db IT |
267 | copy_bytes = sg->length - copy_bytes; |
268 | ||
269 | (*iov)->iov_len = copy_bytes; | |
270 | (*iov)->iov_base = (void __user *) udev->data_off + | |
271 | udev->data_head; | |
272 | ||
273 | if (copy_data) { | |
274 | to = (void *) udev->mb_addr + | |
275 | udev->data_off + udev->data_head; | |
e2e21bd8 | 276 | memcpy(to, from_skip, copy_bytes); |
f97ec7db IT |
277 | tcmu_flush_dcache_range(to, copy_bytes); |
278 | } | |
279 | ||
280 | (*iov_cnt)++; | |
281 | (*iov)++; | |
282 | ||
283 | UPDATE_HEAD(udev->data_head, | |
284 | copy_bytes, udev->data_size); | |
285 | } | |
286 | ||
e2e21bd8 | 287 | kunmap_atomic(from - sg->offset); |
f97ec7db IT |
288 | } |
289 | } | |
290 | ||
291 | static void gather_and_free_data_area(struct tcmu_dev *udev, | |
292 | struct scatterlist *data_sg, unsigned int data_nents) | |
293 | { | |
294 | int i; | |
295 | void *from, *to; | |
296 | size_t copy_bytes; | |
297 | struct scatterlist *sg; | |
298 | ||
299 | /* It'd be easier to look at entry's iovec again, but UAM */ | |
300 | for_each_sg(data_sg, sg, data_nents, i) { | |
301 | copy_bytes = min_t(size_t, sg->length, | |
302 | head_to_end(udev->data_tail, udev->data_size)); | |
303 | ||
304 | to = kmap_atomic(sg_page(sg)) + sg->offset; | |
305 | WARN_ON(sg->length + sg->offset > PAGE_SIZE); | |
306 | from = (void *) udev->mb_addr + | |
307 | udev->data_off + udev->data_tail; | |
308 | tcmu_flush_dcache_range(from, copy_bytes); | |
309 | memcpy(to, from, copy_bytes); | |
310 | ||
311 | UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); | |
312 | ||
313 | /* Uh oh, wrapped the data buffer for this sg's data */ | |
314 | if (sg->length != copy_bytes) { | |
e2e21bd8 SG |
315 | void *to_skip = to + copy_bytes; |
316 | ||
f97ec7db IT |
317 | from = (void *) udev->mb_addr + |
318 | udev->data_off + udev->data_tail; | |
319 | WARN_ON(udev->data_tail); | |
f97ec7db IT |
320 | copy_bytes = sg->length - copy_bytes; |
321 | tcmu_flush_dcache_range(from, copy_bytes); | |
e2e21bd8 | 322 | memcpy(to_skip, from, copy_bytes); |
f97ec7db IT |
323 | |
324 | UPDATE_HEAD(udev->data_tail, | |
325 | copy_bytes, udev->data_size); | |
326 | } | |
e2e21bd8 | 327 | kunmap_atomic(to - sg->offset); |
f97ec7db IT |
328 | } |
329 | } | |
330 | ||
7c9e7a6f | 331 | /* |
f97ec7db IT |
332 | * We can't queue a command until we have space available on the cmd ring *and* |
333 | * space available on the data ring. | |
7c9e7a6f AG |
334 | * |
335 | * Called with ring lock held. | |
336 | */ | |
f56574a2 | 337 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) |
7c9e7a6f AG |
338 | { |
339 | struct tcmu_mailbox *mb = udev->mb_addr; | |
340 | size_t space; | |
341 | u32 cmd_head; | |
f56574a2 | 342 | size_t cmd_needed; |
7c9e7a6f AG |
343 | |
344 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
345 | ||
346 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
347 | ||
f56574a2 AG |
348 | /* |
349 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
350 | * original cmd - cmds are internally contiguous. | |
351 | */ | |
352 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
353 | cmd_needed = cmd_size; | |
354 | else | |
355 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
356 | ||
7c9e7a6f AG |
357 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
358 | if (space < cmd_needed) { | |
359 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
360 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
361 | return false; | |
362 | } | |
363 | ||
364 | space = spc_free(udev->data_head, udev->data_tail, udev->data_size); | |
365 | if (space < data_needed) { | |
366 | pr_debug("no data space: %zu %zu %zu\n", udev->data_head, | |
367 | udev->data_tail, udev->data_size); | |
368 | return false; | |
369 | } | |
370 | ||
371 | return true; | |
372 | } | |
373 | ||
374 | static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
375 | { | |
376 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
377 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
378 | size_t base_command_size, command_size; | |
7c9e7a6f | 379 | struct tcmu_mailbox *mb; |
7c9e7a6f | 380 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 381 | struct iovec *iov; |
f97ec7db | 382 | int iov_cnt; |
7c9e7a6f AG |
383 | uint32_t cmd_head; |
384 | uint64_t cdb_off; | |
f97ec7db | 385 | bool copy_to_data_area; |
7c9e7a6f AG |
386 | |
387 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
388 | return -EINVAL; | |
389 | ||
390 | /* | |
391 | * Must be a certain minimum size for response sense info, but | |
392 | * also may be larger if the iov array is large. | |
393 | * | |
394 | * iovs = sgl_nents+1, for end-of-ring case, plus another 1 | |
395 | * b/c size == offsetof one-past-element. | |
396 | */ | |
397 | base_command_size = max(offsetof(struct tcmu_cmd_entry, | |
e4648b01 IT |
398 | req.iov[se_cmd->t_bidi_data_nents + |
399 | se_cmd->t_data_nents + 2]), | |
7c9e7a6f AG |
400 | sizeof(struct tcmu_cmd_entry)); |
401 | command_size = base_command_size | |
402 | + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); | |
403 | ||
404 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
405 | ||
406 | spin_lock_irq(&udev->cmdr_lock); | |
407 | ||
408 | mb = udev->mb_addr; | |
409 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
410 | if ((command_size > (udev->cmdr_size / 2)) | |
411 | || tcmu_cmd->data_length > (udev->data_size - 1)) | |
412 | pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " | |
413 | "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, | |
414 | udev->cmdr_size, udev->data_size); | |
415 | ||
f56574a2 | 416 | while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { |
7c9e7a6f AG |
417 | int ret; |
418 | DEFINE_WAIT(__wait); | |
419 | ||
420 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
421 | ||
422 | pr_debug("sleeping for ring space\n"); | |
423 | spin_unlock_irq(&udev->cmdr_lock); | |
424 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
425 | finish_wait(&udev->wait_cmdr, &__wait); | |
426 | if (!ret) { | |
427 | pr_warn("tcmu: command timed out\n"); | |
428 | return -ETIMEDOUT; | |
429 | } | |
430 | ||
431 | spin_lock_irq(&udev->cmdr_lock); | |
432 | ||
433 | /* We dropped cmdr_lock, cmd_head is stale */ | |
434 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
435 | } | |
436 | ||
f56574a2 AG |
437 | /* Insert a PAD if end-of-ring space is too small */ |
438 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
439 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
440 | ||
7c9e7a6f AG |
441 | entry = (void *) mb + CMDR_OFF + cmd_head; |
442 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
443 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
444 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
445 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
446 | entry->hdr.kflags = 0; | |
447 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
448 | |
449 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
450 | ||
451 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
452 | WARN_ON(cmd_head != 0); | |
453 | } | |
454 | ||
455 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
456 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
457 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
458 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
459 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
460 | entry->hdr.kflags = 0; | |
461 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
462 | |
463 | /* | |
464 | * Fix up iovecs, and handle if allocation in data ring wrapped. | |
465 | */ | |
466 | iov = &entry->req.iov[0]; | |
f97ec7db | 467 | iov_cnt = 0; |
e4648b01 IT |
468 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
469 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
f97ec7db IT |
470 | alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, |
471 | se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); | |
7c9e7a6f | 472 | entry->req.iov_cnt = iov_cnt; |
0ad46af8 | 473 | entry->req.iov_dif_cnt = 0; |
7c9e7a6f | 474 | |
e4648b01 IT |
475 | /* Handle BIDI commands */ |
476 | iov_cnt = 0; | |
477 | alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, | |
478 | se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); | |
479 | entry->req.iov_bidi_cnt = iov_cnt; | |
480 | ||
7c9e7a6f AG |
481 | /* All offsets relative to mb_addr, not start of entry! */ |
482 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
483 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
484 | entry->req.cdb_off = cdb_off; | |
485 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
486 | ||
487 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
488 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
489 | ||
490 | spin_unlock_irq(&udev->cmdr_lock); | |
491 | ||
492 | /* TODO: only if FLUSH and FUA? */ | |
493 | uio_event_notify(&udev->uio_info); | |
494 | ||
495 | mod_timer(&udev->timeout, | |
496 | round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static int tcmu_queue_cmd(struct se_cmd *se_cmd) | |
502 | { | |
503 | struct se_device *se_dev = se_cmd->se_dev; | |
504 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
505 | struct tcmu_cmd *tcmu_cmd; | |
506 | int ret; | |
507 | ||
508 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
509 | if (!tcmu_cmd) | |
510 | return -ENOMEM; | |
511 | ||
512 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
513 | if (ret < 0) { | |
514 | pr_err("TCMU: Could not queue command\n"); | |
515 | spin_lock_irq(&udev->commands_lock); | |
516 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
517 | spin_unlock_irq(&udev->commands_lock); | |
518 | ||
519 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
520 | } | |
521 | ||
522 | return ret; | |
523 | } | |
524 | ||
525 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
526 | { | |
527 | struct se_cmd *se_cmd = cmd->se_cmd; | |
528 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
529 | ||
530 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
531 | /* cmd has been completed already from timeout, just reclaim data | |
532 | ring space */ | |
533 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
534 | return; | |
535 | } | |
536 | ||
0ad46af8 AG |
537 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
538 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
539 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", | |
540 | cmd->se_cmd); | |
541 | transport_generic_request_failure(cmd->se_cmd, | |
542 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
543 | cmd->se_cmd = NULL; | |
544 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
545 | return; | |
546 | } | |
547 | ||
7c9e7a6f AG |
548 | if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { |
549 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, | |
550 | se_cmd->scsi_sense_length); | |
551 | ||
552 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
e4648b01 IT |
553 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
554 | /* Discard data_out buffer */ | |
555 | UPDATE_HEAD(udev->data_tail, | |
556 | (size_t)se_cmd->t_data_sg->length, udev->data_size); | |
557 | ||
558 | /* Get Data-In buffer */ | |
559 | gather_and_free_data_area(udev, | |
560 | se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); | |
561 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
f97ec7db IT |
562 | gather_and_free_data_area(udev, |
563 | se_cmd->t_data_sg, se_cmd->t_data_nents); | |
7c9e7a6f AG |
564 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
565 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
2bc396a2 IT |
566 | } else if (se_cmd->data_direction != DMA_NONE) { |
567 | pr_warn("TCMU: data direction was %d!\n", | |
568 | se_cmd->data_direction); | |
7c9e7a6f AG |
569 | } |
570 | ||
571 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
572 | cmd->se_cmd = NULL; | |
573 | ||
574 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
575 | } | |
576 | ||
577 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
578 | { | |
579 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
580 | unsigned long flags; |
581 | int handled = 0; | |
582 | ||
583 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
584 | pr_err("ring broken, not handling completions\n"); | |
585 | return 0; | |
586 | } | |
587 | ||
588 | spin_lock_irqsave(&udev->cmdr_lock, flags); | |
589 | ||
590 | mb = udev->mb_addr; | |
591 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
592 | ||
593 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
594 | ||
595 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
596 | struct tcmu_cmd *cmd; | |
597 | ||
598 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
599 | ||
0ad46af8 AG |
600 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
601 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
602 | tcmu_hdr_get_len(entry->hdr.len_op), | |
603 | udev->cmdr_size); | |
7c9e7a6f AG |
604 | continue; |
605 | } | |
0ad46af8 | 606 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
607 | |
608 | spin_lock(&udev->commands_lock); | |
0ad46af8 | 609 | cmd = idr_find(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
610 | if (cmd) |
611 | idr_remove(&udev->commands, cmd->cmd_id); | |
612 | spin_unlock(&udev->commands_lock); | |
613 | ||
614 | if (!cmd) { | |
615 | pr_err("cmd_id not found, ring is broken\n"); | |
616 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
617 | break; | |
618 | } | |
619 | ||
620 | tcmu_handle_completion(cmd, entry); | |
621 | ||
0ad46af8 AG |
622 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
623 | tcmu_hdr_get_len(entry->hdr.len_op), | |
624 | udev->cmdr_size); | |
7c9e7a6f AG |
625 | |
626 | handled++; | |
627 | } | |
628 | ||
629 | if (mb->cmd_tail == mb->cmd_head) | |
630 | del_timer(&udev->timeout); /* no more pending cmds */ | |
631 | ||
632 | spin_unlock_irqrestore(&udev->cmdr_lock, flags); | |
633 | ||
634 | wake_up(&udev->wait_cmdr); | |
635 | ||
636 | return handled; | |
637 | } | |
638 | ||
639 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
640 | { | |
641 | struct tcmu_cmd *cmd = p; | |
642 | ||
643 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
644 | return 0; | |
645 | ||
646 | if (!time_after(cmd->deadline, jiffies)) | |
647 | return 0; | |
648 | ||
649 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
650 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
651 | cmd->se_cmd = NULL; | |
652 | ||
653 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | static void tcmu_device_timedout(unsigned long data) | |
659 | { | |
660 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
661 | unsigned long flags; | |
662 | int handled; | |
663 | ||
664 | handled = tcmu_handle_completions(udev); | |
665 | ||
666 | pr_warn("%d completions handled from timeout\n", handled); | |
667 | ||
668 | spin_lock_irqsave(&udev->commands_lock, flags); | |
669 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
670 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
671 | ||
672 | /* | |
673 | * We don't need to wakeup threads on wait_cmdr since they have their | |
674 | * own timeout. | |
675 | */ | |
676 | } | |
677 | ||
678 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
679 | { | |
680 | struct tcmu_hba *tcmu_hba; | |
681 | ||
682 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
683 | if (!tcmu_hba) | |
684 | return -ENOMEM; | |
685 | ||
686 | tcmu_hba->host_id = host_id; | |
687 | hba->hba_ptr = tcmu_hba; | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | static void tcmu_detach_hba(struct se_hba *hba) | |
693 | { | |
694 | kfree(hba->hba_ptr); | |
695 | hba->hba_ptr = NULL; | |
696 | } | |
697 | ||
698 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
699 | { | |
700 | struct tcmu_dev *udev; | |
701 | ||
702 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
703 | if (!udev) | |
704 | return NULL; | |
705 | ||
706 | udev->name = kstrdup(name, GFP_KERNEL); | |
707 | if (!udev->name) { | |
708 | kfree(udev); | |
709 | return NULL; | |
710 | } | |
711 | ||
712 | udev->hba = hba; | |
713 | ||
714 | init_waitqueue_head(&udev->wait_cmdr); | |
715 | spin_lock_init(&udev->cmdr_lock); | |
716 | ||
717 | idr_init(&udev->commands); | |
718 | spin_lock_init(&udev->commands_lock); | |
719 | ||
720 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
721 | (unsigned long)udev); | |
722 | ||
7c9e7a6f AG |
723 | return &udev->se_dev; |
724 | } | |
725 | ||
726 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
727 | { | |
728 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
729 | ||
730 | tcmu_handle_completions(tcmu_dev); | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | /* | |
736 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
737 | * and this stuff must come along. | |
738 | */ | |
739 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
740 | { | |
741 | struct tcmu_dev *udev = vma->vm_private_data; | |
742 | struct uio_info *info = &udev->uio_info; | |
743 | ||
744 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
745 | if (info->mem[vma->vm_pgoff].size == 0) | |
746 | return -1; | |
747 | return (int)vma->vm_pgoff; | |
748 | } | |
749 | return -1; | |
750 | } | |
751 | ||
752 | static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
753 | { | |
754 | struct tcmu_dev *udev = vma->vm_private_data; | |
755 | struct uio_info *info = &udev->uio_info; | |
756 | struct page *page; | |
757 | unsigned long offset; | |
758 | void *addr; | |
759 | ||
760 | int mi = tcmu_find_mem_index(vma); | |
761 | if (mi < 0) | |
762 | return VM_FAULT_SIGBUS; | |
763 | ||
764 | /* | |
765 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
766 | * to use mem[N]. | |
767 | */ | |
768 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
769 | ||
770 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
771 | if (info->mem[mi].memtype == UIO_MEM_LOGICAL) | |
772 | page = virt_to_page(addr); | |
773 | else | |
774 | page = vmalloc_to_page(addr); | |
775 | get_page(page); | |
776 | vmf->page = page; | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static const struct vm_operations_struct tcmu_vm_ops = { | |
781 | .fault = tcmu_vma_fault, | |
782 | }; | |
783 | ||
784 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
785 | { | |
786 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
787 | ||
788 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
789 | vma->vm_ops = &tcmu_vm_ops; | |
790 | ||
791 | vma->vm_private_data = udev; | |
792 | ||
793 | /* Ensure the mmap is exactly the right size */ | |
794 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
795 | return -EINVAL; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
801 | { | |
802 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
803 | ||
804 | /* O_EXCL not supported for char devs, so fake it? */ | |
805 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
806 | return -EBUSY; | |
807 | ||
808 | pr_debug("open\n"); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
814 | { | |
815 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
816 | ||
817 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
818 | ||
819 | pr_debug("close\n"); | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
824 | static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) | |
825 | { | |
826 | struct sk_buff *skb; | |
827 | void *msg_header; | |
6e14eab9 | 828 | int ret = -ENOMEM; |
7c9e7a6f AG |
829 | |
830 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
831 | if (!skb) | |
6e14eab9 | 832 | return ret; |
7c9e7a6f AG |
833 | |
834 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
835 | if (!msg_header) |
836 | goto free_skb; | |
7c9e7a6f AG |
837 | |
838 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); | |
6e14eab9 NB |
839 | if (ret < 0) |
840 | goto free_skb; | |
7c9e7a6f AG |
841 | |
842 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); | |
6e14eab9 NB |
843 | if (ret < 0) |
844 | goto free_skb; | |
7c9e7a6f | 845 | |
053c095a | 846 | genlmsg_end(skb, msg_header); |
7c9e7a6f AG |
847 | |
848 | ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, | |
849 | TCMU_MCGRP_CONFIG, GFP_KERNEL); | |
850 | ||
851 | /* We don't care if no one is listening */ | |
852 | if (ret == -ESRCH) | |
853 | ret = 0; | |
854 | ||
855 | return ret; | |
6e14eab9 NB |
856 | free_skb: |
857 | nlmsg_free(skb); | |
858 | return ret; | |
7c9e7a6f AG |
859 | } |
860 | ||
861 | static int tcmu_configure_device(struct se_device *dev) | |
862 | { | |
863 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
864 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
865 | struct uio_info *info; | |
866 | struct tcmu_mailbox *mb; | |
867 | size_t size; | |
868 | size_t used; | |
869 | int ret = 0; | |
870 | char *str; | |
871 | ||
872 | info = &udev->uio_info; | |
873 | ||
874 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
875 | udev->dev_config); | |
876 | size += 1; /* for \0 */ | |
877 | str = kmalloc(size, GFP_KERNEL); | |
878 | if (!str) | |
879 | return -ENOMEM; | |
880 | ||
881 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
882 | ||
883 | if (udev->dev_config[0]) | |
884 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
885 | ||
886 | info->name = str; | |
887 | ||
888 | udev->mb_addr = vzalloc(TCMU_RING_SIZE); | |
889 | if (!udev->mb_addr) { | |
890 | ret = -ENOMEM; | |
891 | goto err_vzalloc; | |
892 | } | |
893 | ||
894 | /* mailbox fits in first part of CMDR space */ | |
895 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
896 | udev->data_off = CMDR_SIZE; | |
897 | udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; | |
898 | ||
899 | mb = udev->mb_addr; | |
0ad46af8 | 900 | mb->version = TCMU_MAILBOX_VERSION; |
7c9e7a6f AG |
901 | mb->cmdr_off = CMDR_OFF; |
902 | mb->cmdr_size = udev->cmdr_size; | |
903 | ||
904 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
905 | WARN_ON(udev->data_size % PAGE_SIZE); | |
906 | ||
0ad46af8 | 907 | info->version = xstr(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
908 | |
909 | info->mem[0].name = "tcm-user command & data buffer"; | |
910 | info->mem[0].addr = (phys_addr_t) udev->mb_addr; | |
911 | info->mem[0].size = TCMU_RING_SIZE; | |
912 | info->mem[0].memtype = UIO_MEM_VIRTUAL; | |
913 | ||
914 | info->irqcontrol = tcmu_irqcontrol; | |
915 | info->irq = UIO_IRQ_CUSTOM; | |
916 | ||
917 | info->mmap = tcmu_mmap; | |
918 | info->open = tcmu_open; | |
919 | info->release = tcmu_release; | |
920 | ||
921 | ret = uio_register_device(tcmu_root_device, info); | |
922 | if (ret) | |
923 | goto err_register; | |
924 | ||
925 | /* Other attributes can be configured in userspace */ | |
926 | dev->dev_attrib.hw_block_size = 512; | |
927 | dev->dev_attrib.hw_max_sectors = 128; | |
928 | dev->dev_attrib.hw_queue_depth = 128; | |
929 | ||
930 | ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, | |
931 | udev->uio_info.uio_dev->minor); | |
932 | if (ret) | |
933 | goto err_netlink; | |
934 | ||
935 | return 0; | |
936 | ||
937 | err_netlink: | |
938 | uio_unregister_device(&udev->uio_info); | |
939 | err_register: | |
940 | vfree(udev->mb_addr); | |
941 | err_vzalloc: | |
942 | kfree(info->name); | |
943 | ||
944 | return ret; | |
945 | } | |
946 | ||
947 | static int tcmu_check_pending_cmd(int id, void *p, void *data) | |
948 | { | |
949 | struct tcmu_cmd *cmd = p; | |
950 | ||
951 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
952 | return 0; | |
953 | return -EINVAL; | |
954 | } | |
955 | ||
4cc987ea NB |
956 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
957 | { | |
958 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
959 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
960 | ||
961 | kfree(udev); | |
962 | } | |
963 | ||
7c9e7a6f AG |
964 | static void tcmu_free_device(struct se_device *dev) |
965 | { | |
966 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
967 | int i; | |
968 | ||
969 | del_timer_sync(&udev->timeout); | |
970 | ||
971 | vfree(udev->mb_addr); | |
972 | ||
973 | /* Upper layer should drain all requests before calling this */ | |
974 | spin_lock_irq(&udev->commands_lock); | |
975 | i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); | |
976 | idr_destroy(&udev->commands); | |
977 | spin_unlock_irq(&udev->commands_lock); | |
978 | WARN_ON(i); | |
979 | ||
980 | /* Device was configured */ | |
981 | if (udev->uio_info.uio_dev) { | |
982 | tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, | |
983 | udev->uio_info.uio_dev->minor); | |
984 | ||
985 | uio_unregister_device(&udev->uio_info); | |
986 | kfree(udev->uio_info.name); | |
987 | kfree(udev->name); | |
988 | } | |
4cc987ea | 989 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); |
7c9e7a6f AG |
990 | } |
991 | ||
992 | enum { | |
9c1cd1b6 | 993 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, |
7c9e7a6f AG |
994 | }; |
995 | ||
996 | static match_table_t tokens = { | |
997 | {Opt_dev_config, "dev_config=%s"}, | |
998 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 999 | {Opt_hw_block_size, "hw_block_size=%u"}, |
7c9e7a6f AG |
1000 | {Opt_err, NULL} |
1001 | }; | |
1002 | ||
1003 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, | |
1004 | const char *page, ssize_t count) | |
1005 | { | |
1006 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1007 | char *orig, *ptr, *opts, *arg_p; | |
1008 | substring_t args[MAX_OPT_ARGS]; | |
1009 | int ret = 0, token; | |
9c1cd1b6 | 1010 | unsigned long tmp_ul; |
7c9e7a6f AG |
1011 | |
1012 | opts = kstrdup(page, GFP_KERNEL); | |
1013 | if (!opts) | |
1014 | return -ENOMEM; | |
1015 | ||
1016 | orig = opts; | |
1017 | ||
1018 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1019 | if (!*ptr) | |
1020 | continue; | |
1021 | ||
1022 | token = match_token(ptr, tokens, args); | |
1023 | switch (token) { | |
1024 | case Opt_dev_config: | |
1025 | if (match_strlcpy(udev->dev_config, &args[0], | |
1026 | TCMU_CONFIG_LEN) == 0) { | |
1027 | ret = -EINVAL; | |
1028 | break; | |
1029 | } | |
1030 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1031 | break; | |
1032 | case Opt_dev_size: | |
1033 | arg_p = match_strdup(&args[0]); | |
1034 | if (!arg_p) { | |
1035 | ret = -ENOMEM; | |
1036 | break; | |
1037 | } | |
1038 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1039 | kfree(arg_p); | |
1040 | if (ret < 0) | |
1041 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1042 | break; | |
9c1cd1b6 AG |
1043 | case Opt_hw_block_size: |
1044 | arg_p = match_strdup(&args[0]); | |
1045 | if (!arg_p) { | |
1046 | ret = -ENOMEM; | |
1047 | break; | |
1048 | } | |
1049 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1050 | kfree(arg_p); | |
1051 | if (ret < 0) { | |
1052 | pr_err("kstrtoul() failed for hw_block_size=\n"); | |
1053 | break; | |
1054 | } | |
1055 | if (!tmp_ul) { | |
1056 | pr_err("hw_block_size must be nonzero\n"); | |
1057 | break; | |
1058 | } | |
1059 | dev->dev_attrib.hw_block_size = tmp_ul; | |
1060 | break; | |
7c9e7a6f AG |
1061 | default: |
1062 | break; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | kfree(orig); | |
1067 | return (!ret) ? count : ret; | |
1068 | } | |
1069 | ||
1070 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1071 | { | |
1072 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1073 | ssize_t bl = 0; | |
1074 | ||
1075 | bl = sprintf(b + bl, "Config: %s ", | |
1076 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
8ee83a74 | 1077 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1078 | |
1079 | return bl; | |
1080 | } | |
1081 | ||
1082 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1083 | { | |
1084 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1085 | ||
1086 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1087 | dev->dev_attrib.block_size); | |
1088 | } | |
1089 | ||
1090 | static sense_reason_t | |
9c1cd1b6 | 1091 | tcmu_pass_op(struct se_cmd *se_cmd) |
7c9e7a6f | 1092 | { |
9c1cd1b6 | 1093 | int ret = tcmu_queue_cmd(se_cmd); |
7c9e7a6f AG |
1094 | |
1095 | if (ret != 0) | |
1096 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1097 | else | |
1098 | return TCM_NO_SENSE; | |
1099 | } | |
1100 | ||
1101 | static sense_reason_t | |
9c1cd1b6 | 1102 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1103 | { |
7bfea53b | 1104 | return passthrough_parse_cdb(cmd, tcmu_pass_op); |
7c9e7a6f AG |
1105 | } |
1106 | ||
0a06d430 | 1107 | static const struct target_backend_ops tcmu_ops = { |
7c9e7a6f AG |
1108 | .name = "user", |
1109 | .inquiry_prod = "USER", | |
1110 | .inquiry_rev = TCMU_VERSION, | |
1111 | .owner = THIS_MODULE, | |
a3541703 | 1112 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1113 | .attach_hba = tcmu_attach_hba, |
1114 | .detach_hba = tcmu_detach_hba, | |
1115 | .alloc_device = tcmu_alloc_device, | |
1116 | .configure_device = tcmu_configure_device, | |
1117 | .free_device = tcmu_free_device, | |
1118 | .parse_cdb = tcmu_parse_cdb, | |
1119 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1120 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1121 | .get_device_type = sbc_get_device_type, | |
1122 | .get_blocks = tcmu_get_blocks, | |
5873c4d1 | 1123 | .tb_dev_attrib_attrs = passthrough_attrib_attrs, |
7c9e7a6f AG |
1124 | }; |
1125 | ||
1126 | static int __init tcmu_module_init(void) | |
1127 | { | |
1128 | int ret; | |
1129 | ||
1130 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1131 | ||
1132 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1133 | sizeof(struct tcmu_cmd), | |
1134 | __alignof__(struct tcmu_cmd), | |
1135 | 0, NULL); | |
1136 | if (!tcmu_cmd_cache) | |
1137 | return -ENOMEM; | |
1138 | ||
1139 | tcmu_root_device = root_device_register("tcm_user"); | |
1140 | if (IS_ERR(tcmu_root_device)) { | |
1141 | ret = PTR_ERR(tcmu_root_device); | |
1142 | goto out_free_cache; | |
1143 | } | |
1144 | ||
1145 | ret = genl_register_family(&tcmu_genl_family); | |
1146 | if (ret < 0) { | |
1147 | goto out_unreg_device; | |
1148 | } | |
1149 | ||
0a06d430 | 1150 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f AG |
1151 | if (ret) |
1152 | goto out_unreg_genl; | |
1153 | ||
1154 | return 0; | |
1155 | ||
1156 | out_unreg_genl: | |
1157 | genl_unregister_family(&tcmu_genl_family); | |
1158 | out_unreg_device: | |
1159 | root_device_unregister(tcmu_root_device); | |
1160 | out_free_cache: | |
1161 | kmem_cache_destroy(tcmu_cmd_cache); | |
1162 | ||
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | static void __exit tcmu_module_exit(void) | |
1167 | { | |
0a06d430 | 1168 | target_backend_unregister(&tcmu_ops); |
7c9e7a6f AG |
1169 | genl_unregister_family(&tcmu_genl_family); |
1170 | root_device_unregister(tcmu_root_device); | |
1171 | kmem_cache_destroy(tcmu_cmd_cache); | |
1172 | } | |
1173 | ||
1174 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
1175 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
1176 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
1177 | MODULE_LICENSE("GPL"); | |
1178 | ||
1179 | module_init(tcmu_module_init); | |
1180 | module_exit(tcmu_module_exit); |