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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 | 27 | #include <linux/uio_driver.h> |
ac64a2ce | 28 | #include <linux/stringify.h> |
7c9e7a6f | 29 | #include <net/genetlink.h> |
ba929992 BVA |
30 | #include <scsi/scsi_common.h> |
31 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
32 | #include <target/target_core_base.h> |
33 | #include <target/target_core_fabric.h> | |
34 | #include <target/target_core_backend.h> | |
e9f720d6 | 35 | |
7c9e7a6f AG |
36 | #include <linux/target_core_user.h> |
37 | ||
38 | /* | |
39 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
40 | * data to userspace for processing. This is to allow backends that | |
41 | * are too complex for in-kernel support to be possible. | |
42 | * | |
43 | * It uses the UIO framework to do a lot of the device-creation and | |
44 | * introspection work for us. | |
45 | * | |
46 | * See the .h file for how the ring is laid out. Note that while the | |
47 | * command ring is defined, the particulars of the data area are | |
48 | * not. Offset values in the command entry point to other locations | |
49 | * internal to the mmap()ed area. There is separate space outside the | |
50 | * command ring for data buffers. This leaves maximum flexibility for | |
51 | * moving buffer allocations, or even page flipping or other | |
52 | * allocation techniques, without altering the command ring layout. | |
53 | * | |
54 | * SECURITY: | |
55 | * The user process must be assumed to be malicious. There's no way to | |
56 | * prevent it breaking the command ring protocol if it wants, but in | |
57 | * order to prevent other issues we must only ever read *data* from | |
58 | * the shared memory area, not offsets or sizes. This applies to | |
59 | * command ring entries as well as the mailbox. Extra code needed for | |
60 | * this may have a 'UAM' comment. | |
61 | */ | |
62 | ||
63 | ||
64 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) | |
65 | ||
66 | #define CMDR_SIZE (16 * 4096) | |
67 | #define DATA_SIZE (257 * 4096) | |
68 | ||
69 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) | |
70 | ||
71 | static struct device *tcmu_root_device; | |
72 | ||
73 | struct tcmu_hba { | |
74 | u32 host_id; | |
75 | }; | |
76 | ||
7c9e7a6f AG |
77 | #define TCMU_CONFIG_LEN 256 |
78 | ||
79 | struct tcmu_dev { | |
80 | struct se_device se_dev; | |
81 | ||
82 | char *name; | |
83 | struct se_hba *hba; | |
84 | ||
85 | #define TCMU_DEV_BIT_OPEN 0 | |
86 | #define TCMU_DEV_BIT_BROKEN 1 | |
87 | unsigned long flags; | |
7c9e7a6f AG |
88 | |
89 | struct uio_info uio_info; | |
90 | ||
91 | struct tcmu_mailbox *mb_addr; | |
92 | size_t dev_size; | |
93 | u32 cmdr_size; | |
94 | u32 cmdr_last_cleaned; | |
95 | /* Offset of data ring from start of mb */ | |
96 | size_t data_off; | |
97 | size_t data_size; | |
98 | /* Ring head + tail values. */ | |
99 | /* Must add data_off and mb_addr to get the address */ | |
100 | size_t data_head; | |
101 | size_t data_tail; | |
102 | ||
103 | wait_queue_head_t wait_cmdr; | |
104 | /* TODO should this be a mutex? */ | |
105 | spinlock_t cmdr_lock; | |
106 | ||
107 | struct idr commands; | |
108 | spinlock_t commands_lock; | |
109 | ||
110 | struct timer_list timeout; | |
111 | ||
112 | char dev_config[TCMU_CONFIG_LEN]; | |
113 | }; | |
114 | ||
115 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
116 | ||
117 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
118 | ||
119 | struct tcmu_cmd { | |
120 | struct se_cmd *se_cmd; | |
121 | struct tcmu_dev *tcmu_dev; | |
122 | ||
123 | uint16_t cmd_id; | |
124 | ||
125 | /* Can't use se_cmd->data_length when cleaning up expired cmds, because if | |
126 | cmd has been completed then accessing se_cmd is off limits */ | |
127 | size_t data_length; | |
128 | ||
129 | unsigned long deadline; | |
130 | ||
131 | #define TCMU_CMD_BIT_EXPIRED 0 | |
132 | unsigned long flags; | |
133 | }; | |
134 | ||
135 | static struct kmem_cache *tcmu_cmd_cache; | |
136 | ||
137 | /* multicast group */ | |
138 | enum tcmu_multicast_groups { | |
139 | TCMU_MCGRP_CONFIG, | |
140 | }; | |
141 | ||
142 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
143 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
144 | }; | |
145 | ||
146 | /* Our generic netlink family */ | |
147 | static struct genl_family tcmu_genl_family = { | |
148 | .id = GENL_ID_GENERATE, | |
149 | .hdrsize = 0, | |
150 | .name = "TCM-USER", | |
151 | .version = 1, | |
152 | .maxattr = TCMU_ATTR_MAX, | |
153 | .mcgrps = tcmu_mcgrps, | |
154 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
155 | }; | |
156 | ||
157 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) | |
158 | { | |
159 | struct se_device *se_dev = se_cmd->se_dev; | |
160 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
161 | struct tcmu_cmd *tcmu_cmd; | |
162 | int cmd_id; | |
163 | ||
164 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
165 | if (!tcmu_cmd) | |
166 | return NULL; | |
167 | ||
168 | tcmu_cmd->se_cmd = se_cmd; | |
169 | tcmu_cmd->tcmu_dev = udev; | |
170 | tcmu_cmd->data_length = se_cmd->data_length; | |
171 | ||
e4648b01 IT |
172 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
173 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
174 | tcmu_cmd->data_length += se_cmd->t_bidi_data_sg->length; | |
175 | } | |
176 | ||
7c9e7a6f AG |
177 | tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); |
178 | ||
179 | idr_preload(GFP_KERNEL); | |
180 | spin_lock_irq(&udev->commands_lock); | |
181 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
182 | USHRT_MAX, GFP_NOWAIT); | |
183 | spin_unlock_irq(&udev->commands_lock); | |
184 | idr_preload_end(); | |
185 | ||
186 | if (cmd_id < 0) { | |
187 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
188 | return NULL; | |
189 | } | |
190 | tcmu_cmd->cmd_id = cmd_id; | |
191 | ||
192 | return tcmu_cmd; | |
193 | } | |
194 | ||
195 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
196 | { | |
197 | unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; | |
198 | ||
199 | size = round_up(size+offset, PAGE_SIZE); | |
200 | vaddr -= offset; | |
201 | ||
202 | while (size) { | |
203 | flush_dcache_page(virt_to_page(vaddr)); | |
204 | size -= PAGE_SIZE; | |
205 | } | |
206 | } | |
207 | ||
208 | /* | |
209 | * Some ring helper functions. We don't assume size is a power of 2 so | |
210 | * we can't use circ_buf.h. | |
211 | */ | |
212 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
213 | { | |
214 | int diff = head - tail; | |
215 | ||
216 | if (diff >= 0) | |
217 | return diff; | |
218 | else | |
219 | return size + diff; | |
220 | } | |
221 | ||
222 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
223 | { | |
224 | /* Keep 1 byte unused or we can't tell full from empty */ | |
225 | return (size - spc_used(head, tail, size) - 1); | |
226 | } | |
227 | ||
228 | static inline size_t head_to_end(size_t head, size_t size) | |
229 | { | |
230 | return size - head; | |
231 | } | |
232 | ||
233 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) | |
234 | ||
f97ec7db IT |
235 | static void alloc_and_scatter_data_area(struct tcmu_dev *udev, |
236 | struct scatterlist *data_sg, unsigned int data_nents, | |
237 | struct iovec **iov, int *iov_cnt, bool copy_data) | |
238 | { | |
239 | int i; | |
240 | void *from, *to; | |
241 | size_t copy_bytes; | |
242 | struct scatterlist *sg; | |
243 | ||
244 | for_each_sg(data_sg, sg, data_nents, i) { | |
245 | copy_bytes = min_t(size_t, sg->length, | |
246 | head_to_end(udev->data_head, udev->data_size)); | |
247 | from = kmap_atomic(sg_page(sg)) + sg->offset; | |
248 | to = (void *) udev->mb_addr + udev->data_off + udev->data_head; | |
249 | ||
250 | if (copy_data) { | |
251 | memcpy(to, from, copy_bytes); | |
252 | tcmu_flush_dcache_range(to, copy_bytes); | |
253 | } | |
254 | ||
255 | /* Even iov_base is relative to mb_addr */ | |
256 | (*iov)->iov_len = copy_bytes; | |
257 | (*iov)->iov_base = (void __user *) udev->data_off + | |
258 | udev->data_head; | |
259 | (*iov_cnt)++; | |
260 | (*iov)++; | |
261 | ||
262 | UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); | |
263 | ||
264 | /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ | |
265 | if (sg->length != copy_bytes) { | |
e2e21bd8 SG |
266 | void *from_skip = from + copy_bytes; |
267 | ||
f97ec7db IT |
268 | copy_bytes = sg->length - copy_bytes; |
269 | ||
270 | (*iov)->iov_len = copy_bytes; | |
271 | (*iov)->iov_base = (void __user *) udev->data_off + | |
272 | udev->data_head; | |
273 | ||
274 | if (copy_data) { | |
275 | to = (void *) udev->mb_addr + | |
276 | udev->data_off + udev->data_head; | |
e2e21bd8 | 277 | memcpy(to, from_skip, copy_bytes); |
f97ec7db IT |
278 | tcmu_flush_dcache_range(to, copy_bytes); |
279 | } | |
280 | ||
281 | (*iov_cnt)++; | |
282 | (*iov)++; | |
283 | ||
284 | UPDATE_HEAD(udev->data_head, | |
285 | copy_bytes, udev->data_size); | |
286 | } | |
287 | ||
e2e21bd8 | 288 | kunmap_atomic(from - sg->offset); |
f97ec7db IT |
289 | } |
290 | } | |
291 | ||
292 | static void gather_and_free_data_area(struct tcmu_dev *udev, | |
293 | struct scatterlist *data_sg, unsigned int data_nents) | |
294 | { | |
295 | int i; | |
296 | void *from, *to; | |
297 | size_t copy_bytes; | |
298 | struct scatterlist *sg; | |
299 | ||
300 | /* It'd be easier to look at entry's iovec again, but UAM */ | |
301 | for_each_sg(data_sg, sg, data_nents, i) { | |
302 | copy_bytes = min_t(size_t, sg->length, | |
303 | head_to_end(udev->data_tail, udev->data_size)); | |
304 | ||
305 | to = kmap_atomic(sg_page(sg)) + sg->offset; | |
306 | WARN_ON(sg->length + sg->offset > PAGE_SIZE); | |
307 | from = (void *) udev->mb_addr + | |
308 | udev->data_off + udev->data_tail; | |
309 | tcmu_flush_dcache_range(from, copy_bytes); | |
310 | memcpy(to, from, copy_bytes); | |
311 | ||
312 | UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); | |
313 | ||
314 | /* Uh oh, wrapped the data buffer for this sg's data */ | |
315 | if (sg->length != copy_bytes) { | |
e2e21bd8 SG |
316 | void *to_skip = to + copy_bytes; |
317 | ||
f97ec7db IT |
318 | from = (void *) udev->mb_addr + |
319 | udev->data_off + udev->data_tail; | |
320 | WARN_ON(udev->data_tail); | |
f97ec7db IT |
321 | copy_bytes = sg->length - copy_bytes; |
322 | tcmu_flush_dcache_range(from, copy_bytes); | |
e2e21bd8 | 323 | memcpy(to_skip, from, copy_bytes); |
f97ec7db IT |
324 | |
325 | UPDATE_HEAD(udev->data_tail, | |
326 | copy_bytes, udev->data_size); | |
327 | } | |
e2e21bd8 | 328 | kunmap_atomic(to - sg->offset); |
f97ec7db IT |
329 | } |
330 | } | |
331 | ||
7c9e7a6f | 332 | /* |
f97ec7db IT |
333 | * We can't queue a command until we have space available on the cmd ring *and* |
334 | * space available on the data ring. | |
7c9e7a6f AG |
335 | * |
336 | * Called with ring lock held. | |
337 | */ | |
f56574a2 | 338 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) |
7c9e7a6f AG |
339 | { |
340 | struct tcmu_mailbox *mb = udev->mb_addr; | |
341 | size_t space; | |
342 | u32 cmd_head; | |
f56574a2 | 343 | size_t cmd_needed; |
7c9e7a6f AG |
344 | |
345 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
346 | ||
347 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
348 | ||
f56574a2 AG |
349 | /* |
350 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
351 | * original cmd - cmds are internally contiguous. | |
352 | */ | |
353 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
354 | cmd_needed = cmd_size; | |
355 | else | |
356 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
357 | ||
7c9e7a6f AG |
358 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
359 | if (space < cmd_needed) { | |
360 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
361 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
362 | return false; | |
363 | } | |
364 | ||
365 | space = spc_free(udev->data_head, udev->data_tail, udev->data_size); | |
366 | if (space < data_needed) { | |
367 | pr_debug("no data space: %zu %zu %zu\n", udev->data_head, | |
368 | udev->data_tail, udev->data_size); | |
369 | return false; | |
370 | } | |
371 | ||
372 | return true; | |
373 | } | |
374 | ||
375 | static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
376 | { | |
377 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
378 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
379 | size_t base_command_size, command_size; | |
7c9e7a6f | 380 | struct tcmu_mailbox *mb; |
7c9e7a6f | 381 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 382 | struct iovec *iov; |
f97ec7db | 383 | int iov_cnt; |
7c9e7a6f AG |
384 | uint32_t cmd_head; |
385 | uint64_t cdb_off; | |
f97ec7db | 386 | bool copy_to_data_area; |
7c9e7a6f AG |
387 | |
388 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
389 | return -EINVAL; | |
390 | ||
391 | /* | |
392 | * Must be a certain minimum size for response sense info, but | |
393 | * also may be larger if the iov array is large. | |
394 | * | |
395 | * iovs = sgl_nents+1, for end-of-ring case, plus another 1 | |
396 | * b/c size == offsetof one-past-element. | |
397 | */ | |
398 | base_command_size = max(offsetof(struct tcmu_cmd_entry, | |
e4648b01 IT |
399 | req.iov[se_cmd->t_bidi_data_nents + |
400 | se_cmd->t_data_nents + 2]), | |
7c9e7a6f AG |
401 | sizeof(struct tcmu_cmd_entry)); |
402 | command_size = base_command_size | |
403 | + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); | |
404 | ||
405 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
406 | ||
407 | spin_lock_irq(&udev->cmdr_lock); | |
408 | ||
409 | mb = udev->mb_addr; | |
410 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
411 | if ((command_size > (udev->cmdr_size / 2)) | |
412 | || tcmu_cmd->data_length > (udev->data_size - 1)) | |
413 | pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " | |
414 | "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, | |
415 | udev->cmdr_size, udev->data_size); | |
416 | ||
f56574a2 | 417 | while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { |
7c9e7a6f AG |
418 | int ret; |
419 | DEFINE_WAIT(__wait); | |
420 | ||
421 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
422 | ||
423 | pr_debug("sleeping for ring space\n"); | |
424 | spin_unlock_irq(&udev->cmdr_lock); | |
425 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
426 | finish_wait(&udev->wait_cmdr, &__wait); | |
427 | if (!ret) { | |
428 | pr_warn("tcmu: command timed out\n"); | |
429 | return -ETIMEDOUT; | |
430 | } | |
431 | ||
432 | spin_lock_irq(&udev->cmdr_lock); | |
433 | ||
434 | /* We dropped cmdr_lock, cmd_head is stale */ | |
435 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
436 | } | |
437 | ||
f56574a2 AG |
438 | /* Insert a PAD if end-of-ring space is too small */ |
439 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
440 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
441 | ||
7c9e7a6f AG |
442 | entry = (void *) mb + CMDR_OFF + cmd_head; |
443 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
444 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
445 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
446 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
447 | entry->hdr.kflags = 0; | |
448 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
449 | |
450 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
451 | ||
452 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
453 | WARN_ON(cmd_head != 0); | |
454 | } | |
455 | ||
456 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
457 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
458 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
459 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
460 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
461 | entry->hdr.kflags = 0; | |
462 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
463 | |
464 | /* | |
465 | * Fix up iovecs, and handle if allocation in data ring wrapped. | |
466 | */ | |
467 | iov = &entry->req.iov[0]; | |
f97ec7db | 468 | iov_cnt = 0; |
e4648b01 IT |
469 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
470 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
f97ec7db IT |
471 | alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, |
472 | se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); | |
7c9e7a6f | 473 | entry->req.iov_cnt = iov_cnt; |
0ad46af8 | 474 | entry->req.iov_dif_cnt = 0; |
7c9e7a6f | 475 | |
e4648b01 IT |
476 | /* Handle BIDI commands */ |
477 | iov_cnt = 0; | |
478 | alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, | |
479 | se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); | |
480 | entry->req.iov_bidi_cnt = iov_cnt; | |
481 | ||
7c9e7a6f AG |
482 | /* All offsets relative to mb_addr, not start of entry! */ |
483 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
484 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
485 | entry->req.cdb_off = cdb_off; | |
486 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
487 | ||
488 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
489 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
490 | ||
491 | spin_unlock_irq(&udev->cmdr_lock); | |
492 | ||
493 | /* TODO: only if FLUSH and FUA? */ | |
494 | uio_event_notify(&udev->uio_info); | |
495 | ||
496 | mod_timer(&udev->timeout, | |
497 | round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static int tcmu_queue_cmd(struct se_cmd *se_cmd) | |
503 | { | |
504 | struct se_device *se_dev = se_cmd->se_dev; | |
505 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
506 | struct tcmu_cmd *tcmu_cmd; | |
507 | int ret; | |
508 | ||
509 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
510 | if (!tcmu_cmd) | |
511 | return -ENOMEM; | |
512 | ||
513 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
514 | if (ret < 0) { | |
515 | pr_err("TCMU: Could not queue command\n"); | |
516 | spin_lock_irq(&udev->commands_lock); | |
517 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
518 | spin_unlock_irq(&udev->commands_lock); | |
519 | ||
520 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
521 | } | |
522 | ||
523 | return ret; | |
524 | } | |
525 | ||
526 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
527 | { | |
528 | struct se_cmd *se_cmd = cmd->se_cmd; | |
529 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
530 | ||
531 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
532 | /* cmd has been completed already from timeout, just reclaim data | |
533 | ring space */ | |
534 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
535 | return; | |
536 | } | |
537 | ||
0ad46af8 AG |
538 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
539 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
540 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", | |
541 | cmd->se_cmd); | |
ed97d0cd AG |
542 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
543 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
7c9e7a6f AG |
544 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, |
545 | se_cmd->scsi_sense_length); | |
546 | ||
547 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
e4648b01 IT |
548 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
549 | /* Discard data_out buffer */ | |
550 | UPDATE_HEAD(udev->data_tail, | |
551 | (size_t)se_cmd->t_data_sg->length, udev->data_size); | |
552 | ||
553 | /* Get Data-In buffer */ | |
554 | gather_and_free_data_area(udev, | |
555 | se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); | |
556 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
f97ec7db IT |
557 | gather_and_free_data_area(udev, |
558 | se_cmd->t_data_sg, se_cmd->t_data_nents); | |
7c9e7a6f AG |
559 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
560 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
2bc396a2 IT |
561 | } else if (se_cmd->data_direction != DMA_NONE) { |
562 | pr_warn("TCMU: data direction was %d!\n", | |
563 | se_cmd->data_direction); | |
7c9e7a6f AG |
564 | } |
565 | ||
566 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
567 | cmd->se_cmd = NULL; | |
568 | ||
569 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
570 | } | |
571 | ||
572 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
573 | { | |
574 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
575 | unsigned long flags; |
576 | int handled = 0; | |
577 | ||
578 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
579 | pr_err("ring broken, not handling completions\n"); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | spin_lock_irqsave(&udev->cmdr_lock, flags); | |
584 | ||
585 | mb = udev->mb_addr; | |
586 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
587 | ||
588 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
589 | ||
590 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
591 | struct tcmu_cmd *cmd; | |
592 | ||
593 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
594 | ||
0ad46af8 AG |
595 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
596 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
597 | tcmu_hdr_get_len(entry->hdr.len_op), | |
598 | udev->cmdr_size); | |
7c9e7a6f AG |
599 | continue; |
600 | } | |
0ad46af8 | 601 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
602 | |
603 | spin_lock(&udev->commands_lock); | |
0ad46af8 | 604 | cmd = idr_find(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
605 | if (cmd) |
606 | idr_remove(&udev->commands, cmd->cmd_id); | |
607 | spin_unlock(&udev->commands_lock); | |
608 | ||
609 | if (!cmd) { | |
610 | pr_err("cmd_id not found, ring is broken\n"); | |
611 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
612 | break; | |
613 | } | |
614 | ||
615 | tcmu_handle_completion(cmd, entry); | |
616 | ||
0ad46af8 AG |
617 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
618 | tcmu_hdr_get_len(entry->hdr.len_op), | |
619 | udev->cmdr_size); | |
7c9e7a6f AG |
620 | |
621 | handled++; | |
622 | } | |
623 | ||
624 | if (mb->cmd_tail == mb->cmd_head) | |
625 | del_timer(&udev->timeout); /* no more pending cmds */ | |
626 | ||
627 | spin_unlock_irqrestore(&udev->cmdr_lock, flags); | |
628 | ||
629 | wake_up(&udev->wait_cmdr); | |
630 | ||
631 | return handled; | |
632 | } | |
633 | ||
634 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
635 | { | |
636 | struct tcmu_cmd *cmd = p; | |
637 | ||
638 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
639 | return 0; | |
640 | ||
641 | if (!time_after(cmd->deadline, jiffies)) | |
642 | return 0; | |
643 | ||
644 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
645 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
646 | cmd->se_cmd = NULL; | |
647 | ||
648 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | static void tcmu_device_timedout(unsigned long data) | |
654 | { | |
655 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
656 | unsigned long flags; | |
657 | int handled; | |
658 | ||
659 | handled = tcmu_handle_completions(udev); | |
660 | ||
661 | pr_warn("%d completions handled from timeout\n", handled); | |
662 | ||
663 | spin_lock_irqsave(&udev->commands_lock, flags); | |
664 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
665 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
666 | ||
667 | /* | |
668 | * We don't need to wakeup threads on wait_cmdr since they have their | |
669 | * own timeout. | |
670 | */ | |
671 | } | |
672 | ||
673 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
674 | { | |
675 | struct tcmu_hba *tcmu_hba; | |
676 | ||
677 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
678 | if (!tcmu_hba) | |
679 | return -ENOMEM; | |
680 | ||
681 | tcmu_hba->host_id = host_id; | |
682 | hba->hba_ptr = tcmu_hba; | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | static void tcmu_detach_hba(struct se_hba *hba) | |
688 | { | |
689 | kfree(hba->hba_ptr); | |
690 | hba->hba_ptr = NULL; | |
691 | } | |
692 | ||
693 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
694 | { | |
695 | struct tcmu_dev *udev; | |
696 | ||
697 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
698 | if (!udev) | |
699 | return NULL; | |
700 | ||
701 | udev->name = kstrdup(name, GFP_KERNEL); | |
702 | if (!udev->name) { | |
703 | kfree(udev); | |
704 | return NULL; | |
705 | } | |
706 | ||
707 | udev->hba = hba; | |
708 | ||
709 | init_waitqueue_head(&udev->wait_cmdr); | |
710 | spin_lock_init(&udev->cmdr_lock); | |
711 | ||
712 | idr_init(&udev->commands); | |
713 | spin_lock_init(&udev->commands_lock); | |
714 | ||
715 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
716 | (unsigned long)udev); | |
717 | ||
7c9e7a6f AG |
718 | return &udev->se_dev; |
719 | } | |
720 | ||
721 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
722 | { | |
723 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
724 | ||
725 | tcmu_handle_completions(tcmu_dev); | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | /* | |
731 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
732 | * and this stuff must come along. | |
733 | */ | |
734 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
735 | { | |
736 | struct tcmu_dev *udev = vma->vm_private_data; | |
737 | struct uio_info *info = &udev->uio_info; | |
738 | ||
739 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
740 | if (info->mem[vma->vm_pgoff].size == 0) | |
741 | return -1; | |
742 | return (int)vma->vm_pgoff; | |
743 | } | |
744 | return -1; | |
745 | } | |
746 | ||
747 | static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
748 | { | |
749 | struct tcmu_dev *udev = vma->vm_private_data; | |
750 | struct uio_info *info = &udev->uio_info; | |
751 | struct page *page; | |
752 | unsigned long offset; | |
753 | void *addr; | |
754 | ||
755 | int mi = tcmu_find_mem_index(vma); | |
756 | if (mi < 0) | |
757 | return VM_FAULT_SIGBUS; | |
758 | ||
759 | /* | |
760 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
761 | * to use mem[N]. | |
762 | */ | |
763 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
764 | ||
765 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
766 | if (info->mem[mi].memtype == UIO_MEM_LOGICAL) | |
767 | page = virt_to_page(addr); | |
768 | else | |
769 | page = vmalloc_to_page(addr); | |
770 | get_page(page); | |
771 | vmf->page = page; | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static const struct vm_operations_struct tcmu_vm_ops = { | |
776 | .fault = tcmu_vma_fault, | |
777 | }; | |
778 | ||
779 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
780 | { | |
781 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
782 | ||
783 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
784 | vma->vm_ops = &tcmu_vm_ops; | |
785 | ||
786 | vma->vm_private_data = udev; | |
787 | ||
788 | /* Ensure the mmap is exactly the right size */ | |
789 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
790 | return -EINVAL; | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
796 | { | |
797 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
798 | ||
799 | /* O_EXCL not supported for char devs, so fake it? */ | |
800 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
801 | return -EBUSY; | |
802 | ||
803 | pr_debug("open\n"); | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
809 | { | |
810 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
811 | ||
812 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
813 | ||
814 | pr_debug("close\n"); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) | |
820 | { | |
821 | struct sk_buff *skb; | |
822 | void *msg_header; | |
6e14eab9 | 823 | int ret = -ENOMEM; |
7c9e7a6f AG |
824 | |
825 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
826 | if (!skb) | |
6e14eab9 | 827 | return ret; |
7c9e7a6f AG |
828 | |
829 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
830 | if (!msg_header) |
831 | goto free_skb; | |
7c9e7a6f AG |
832 | |
833 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); | |
6e14eab9 NB |
834 | if (ret < 0) |
835 | goto free_skb; | |
7c9e7a6f AG |
836 | |
837 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); | |
6e14eab9 NB |
838 | if (ret < 0) |
839 | goto free_skb; | |
7c9e7a6f | 840 | |
053c095a | 841 | genlmsg_end(skb, msg_header); |
7c9e7a6f AG |
842 | |
843 | ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, | |
844 | TCMU_MCGRP_CONFIG, GFP_KERNEL); | |
845 | ||
846 | /* We don't care if no one is listening */ | |
847 | if (ret == -ESRCH) | |
848 | ret = 0; | |
849 | ||
850 | return ret; | |
6e14eab9 NB |
851 | free_skb: |
852 | nlmsg_free(skb); | |
853 | return ret; | |
7c9e7a6f AG |
854 | } |
855 | ||
856 | static int tcmu_configure_device(struct se_device *dev) | |
857 | { | |
858 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
859 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
860 | struct uio_info *info; | |
861 | struct tcmu_mailbox *mb; | |
862 | size_t size; | |
863 | size_t used; | |
864 | int ret = 0; | |
865 | char *str; | |
866 | ||
867 | info = &udev->uio_info; | |
868 | ||
869 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
870 | udev->dev_config); | |
871 | size += 1; /* for \0 */ | |
872 | str = kmalloc(size, GFP_KERNEL); | |
873 | if (!str) | |
874 | return -ENOMEM; | |
875 | ||
876 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
877 | ||
878 | if (udev->dev_config[0]) | |
879 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
880 | ||
881 | info->name = str; | |
882 | ||
883 | udev->mb_addr = vzalloc(TCMU_RING_SIZE); | |
884 | if (!udev->mb_addr) { | |
885 | ret = -ENOMEM; | |
886 | goto err_vzalloc; | |
887 | } | |
888 | ||
889 | /* mailbox fits in first part of CMDR space */ | |
890 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
891 | udev->data_off = CMDR_SIZE; | |
892 | udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; | |
893 | ||
894 | mb = udev->mb_addr; | |
0ad46af8 | 895 | mb->version = TCMU_MAILBOX_VERSION; |
7c9e7a6f AG |
896 | mb->cmdr_off = CMDR_OFF; |
897 | mb->cmdr_size = udev->cmdr_size; | |
898 | ||
899 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
900 | WARN_ON(udev->data_size % PAGE_SIZE); | |
901 | ||
ac64a2ce | 902 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
903 | |
904 | info->mem[0].name = "tcm-user command & data buffer"; | |
905 | info->mem[0].addr = (phys_addr_t) udev->mb_addr; | |
906 | info->mem[0].size = TCMU_RING_SIZE; | |
907 | info->mem[0].memtype = UIO_MEM_VIRTUAL; | |
908 | ||
909 | info->irqcontrol = tcmu_irqcontrol; | |
910 | info->irq = UIO_IRQ_CUSTOM; | |
911 | ||
912 | info->mmap = tcmu_mmap; | |
913 | info->open = tcmu_open; | |
914 | info->release = tcmu_release; | |
915 | ||
916 | ret = uio_register_device(tcmu_root_device, info); | |
917 | if (ret) | |
918 | goto err_register; | |
919 | ||
920 | /* Other attributes can be configured in userspace */ | |
921 | dev->dev_attrib.hw_block_size = 512; | |
922 | dev->dev_attrib.hw_max_sectors = 128; | |
923 | dev->dev_attrib.hw_queue_depth = 128; | |
924 | ||
925 | ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, | |
926 | udev->uio_info.uio_dev->minor); | |
927 | if (ret) | |
928 | goto err_netlink; | |
929 | ||
930 | return 0; | |
931 | ||
932 | err_netlink: | |
933 | uio_unregister_device(&udev->uio_info); | |
934 | err_register: | |
935 | vfree(udev->mb_addr); | |
936 | err_vzalloc: | |
937 | kfree(info->name); | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | static int tcmu_check_pending_cmd(int id, void *p, void *data) | |
943 | { | |
944 | struct tcmu_cmd *cmd = p; | |
945 | ||
946 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
947 | return 0; | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
4cc987ea NB |
951 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
952 | { | |
953 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
954 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
955 | ||
956 | kfree(udev); | |
957 | } | |
958 | ||
7c9e7a6f AG |
959 | static void tcmu_free_device(struct se_device *dev) |
960 | { | |
961 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
962 | int i; | |
963 | ||
964 | del_timer_sync(&udev->timeout); | |
965 | ||
966 | vfree(udev->mb_addr); | |
967 | ||
968 | /* Upper layer should drain all requests before calling this */ | |
969 | spin_lock_irq(&udev->commands_lock); | |
970 | i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); | |
971 | idr_destroy(&udev->commands); | |
972 | spin_unlock_irq(&udev->commands_lock); | |
973 | WARN_ON(i); | |
974 | ||
975 | /* Device was configured */ | |
976 | if (udev->uio_info.uio_dev) { | |
977 | tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, | |
978 | udev->uio_info.uio_dev->minor); | |
979 | ||
980 | uio_unregister_device(&udev->uio_info); | |
981 | kfree(udev->uio_info.name); | |
982 | kfree(udev->name); | |
983 | } | |
4cc987ea | 984 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); |
7c9e7a6f AG |
985 | } |
986 | ||
987 | enum { | |
9c1cd1b6 | 988 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, |
7c9e7a6f AG |
989 | }; |
990 | ||
991 | static match_table_t tokens = { | |
992 | {Opt_dev_config, "dev_config=%s"}, | |
993 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 994 | {Opt_hw_block_size, "hw_block_size=%u"}, |
7c9e7a6f AG |
995 | {Opt_err, NULL} |
996 | }; | |
997 | ||
998 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, | |
999 | const char *page, ssize_t count) | |
1000 | { | |
1001 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1002 | char *orig, *ptr, *opts, *arg_p; | |
1003 | substring_t args[MAX_OPT_ARGS]; | |
1004 | int ret = 0, token; | |
9c1cd1b6 | 1005 | unsigned long tmp_ul; |
7c9e7a6f AG |
1006 | |
1007 | opts = kstrdup(page, GFP_KERNEL); | |
1008 | if (!opts) | |
1009 | return -ENOMEM; | |
1010 | ||
1011 | orig = opts; | |
1012 | ||
1013 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1014 | if (!*ptr) | |
1015 | continue; | |
1016 | ||
1017 | token = match_token(ptr, tokens, args); | |
1018 | switch (token) { | |
1019 | case Opt_dev_config: | |
1020 | if (match_strlcpy(udev->dev_config, &args[0], | |
1021 | TCMU_CONFIG_LEN) == 0) { | |
1022 | ret = -EINVAL; | |
1023 | break; | |
1024 | } | |
1025 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1026 | break; | |
1027 | case Opt_dev_size: | |
1028 | arg_p = match_strdup(&args[0]); | |
1029 | if (!arg_p) { | |
1030 | ret = -ENOMEM; | |
1031 | break; | |
1032 | } | |
1033 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1034 | kfree(arg_p); | |
1035 | if (ret < 0) | |
1036 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1037 | break; | |
9c1cd1b6 AG |
1038 | case Opt_hw_block_size: |
1039 | arg_p = match_strdup(&args[0]); | |
1040 | if (!arg_p) { | |
1041 | ret = -ENOMEM; | |
1042 | break; | |
1043 | } | |
1044 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1045 | kfree(arg_p); | |
1046 | if (ret < 0) { | |
1047 | pr_err("kstrtoul() failed for hw_block_size=\n"); | |
1048 | break; | |
1049 | } | |
1050 | if (!tmp_ul) { | |
1051 | pr_err("hw_block_size must be nonzero\n"); | |
1052 | break; | |
1053 | } | |
1054 | dev->dev_attrib.hw_block_size = tmp_ul; | |
1055 | break; | |
7c9e7a6f AG |
1056 | default: |
1057 | break; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | kfree(orig); | |
1062 | return (!ret) ? count : ret; | |
1063 | } | |
1064 | ||
1065 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1066 | { | |
1067 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1068 | ssize_t bl = 0; | |
1069 | ||
1070 | bl = sprintf(b + bl, "Config: %s ", | |
1071 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
8ee83a74 | 1072 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1073 | |
1074 | return bl; | |
1075 | } | |
1076 | ||
1077 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1078 | { | |
1079 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1080 | ||
1081 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1082 | dev->dev_attrib.block_size); | |
1083 | } | |
1084 | ||
1085 | static sense_reason_t | |
9c1cd1b6 | 1086 | tcmu_pass_op(struct se_cmd *se_cmd) |
7c9e7a6f | 1087 | { |
9c1cd1b6 | 1088 | int ret = tcmu_queue_cmd(se_cmd); |
7c9e7a6f AG |
1089 | |
1090 | if (ret != 0) | |
1091 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1092 | else | |
1093 | return TCM_NO_SENSE; | |
1094 | } | |
1095 | ||
1096 | static sense_reason_t | |
9c1cd1b6 | 1097 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1098 | { |
7bfea53b | 1099 | return passthrough_parse_cdb(cmd, tcmu_pass_op); |
7c9e7a6f AG |
1100 | } |
1101 | ||
0a06d430 | 1102 | static const struct target_backend_ops tcmu_ops = { |
7c9e7a6f AG |
1103 | .name = "user", |
1104 | .inquiry_prod = "USER", | |
1105 | .inquiry_rev = TCMU_VERSION, | |
1106 | .owner = THIS_MODULE, | |
a3541703 | 1107 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1108 | .attach_hba = tcmu_attach_hba, |
1109 | .detach_hba = tcmu_detach_hba, | |
1110 | .alloc_device = tcmu_alloc_device, | |
1111 | .configure_device = tcmu_configure_device, | |
1112 | .free_device = tcmu_free_device, | |
1113 | .parse_cdb = tcmu_parse_cdb, | |
1114 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1115 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1116 | .get_device_type = sbc_get_device_type, | |
1117 | .get_blocks = tcmu_get_blocks, | |
5873c4d1 | 1118 | .tb_dev_attrib_attrs = passthrough_attrib_attrs, |
7c9e7a6f AG |
1119 | }; |
1120 | ||
1121 | static int __init tcmu_module_init(void) | |
1122 | { | |
1123 | int ret; | |
1124 | ||
1125 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1126 | ||
1127 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1128 | sizeof(struct tcmu_cmd), | |
1129 | __alignof__(struct tcmu_cmd), | |
1130 | 0, NULL); | |
1131 | if (!tcmu_cmd_cache) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | tcmu_root_device = root_device_register("tcm_user"); | |
1135 | if (IS_ERR(tcmu_root_device)) { | |
1136 | ret = PTR_ERR(tcmu_root_device); | |
1137 | goto out_free_cache; | |
1138 | } | |
1139 | ||
1140 | ret = genl_register_family(&tcmu_genl_family); | |
1141 | if (ret < 0) { | |
1142 | goto out_unreg_device; | |
1143 | } | |
1144 | ||
0a06d430 | 1145 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f AG |
1146 | if (ret) |
1147 | goto out_unreg_genl; | |
1148 | ||
1149 | return 0; | |
1150 | ||
1151 | out_unreg_genl: | |
1152 | genl_unregister_family(&tcmu_genl_family); | |
1153 | out_unreg_device: | |
1154 | root_device_unregister(tcmu_root_device); | |
1155 | out_free_cache: | |
1156 | kmem_cache_destroy(tcmu_cmd_cache); | |
1157 | ||
1158 | return ret; | |
1159 | } | |
1160 | ||
1161 | static void __exit tcmu_module_exit(void) | |
1162 | { | |
0a06d430 | 1163 | target_backend_unregister(&tcmu_ops); |
7c9e7a6f AG |
1164 | genl_unregister_family(&tcmu_genl_family); |
1165 | root_device_unregister(tcmu_root_device); | |
1166 | kmem_cache_destroy(tcmu_cmd_cache); | |
1167 | } | |
1168 | ||
1169 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
1170 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
1171 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
1172 | MODULE_LICENSE("GPL"); | |
1173 | ||
1174 | module_init(tcmu_module_init); | |
1175 | module_exit(tcmu_module_exit); |