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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. |
141685a3 | 5 | * Copyright (C) 2017 Chinamobile, Inc. |
7c9e7a6f AG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/spinlock.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/idr.h> | |
ba929992 | 24 | #include <linux/kernel.h> |
7c9e7a6f AG |
25 | #include <linux/timer.h> |
26 | #include <linux/parser.h> | |
5538d294 | 27 | #include <linux/vmalloc.h> |
7c9e7a6f | 28 | #include <linux/uio_driver.h> |
141685a3 | 29 | #include <linux/radix-tree.h> |
ac64a2ce | 30 | #include <linux/stringify.h> |
26418649 | 31 | #include <linux/bitops.h> |
f5045724 | 32 | #include <linux/highmem.h> |
7d7a7435 | 33 | #include <linux/configfs.h> |
7c9e7a6f | 34 | #include <net/genetlink.h> |
ba929992 BVA |
35 | #include <scsi/scsi_common.h> |
36 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
37 | #include <target/target_core_base.h> |
38 | #include <target/target_core_fabric.h> | |
39 | #include <target/target_core_backend.h> | |
e9f720d6 | 40 | |
7c9e7a6f AG |
41 | #include <linux/target_core_user.h> |
42 | ||
43 | /* | |
44 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
45 | * data to userspace for processing. This is to allow backends that | |
46 | * are too complex for in-kernel support to be possible. | |
47 | * | |
48 | * It uses the UIO framework to do a lot of the device-creation and | |
49 | * introspection work for us. | |
50 | * | |
51 | * See the .h file for how the ring is laid out. Note that while the | |
52 | * command ring is defined, the particulars of the data area are | |
53 | * not. Offset values in the command entry point to other locations | |
54 | * internal to the mmap()ed area. There is separate space outside the | |
55 | * command ring for data buffers. This leaves maximum flexibility for | |
56 | * moving buffer allocations, or even page flipping or other | |
57 | * allocation techniques, without altering the command ring layout. | |
58 | * | |
59 | * SECURITY: | |
60 | * The user process must be assumed to be malicious. There's no way to | |
61 | * prevent it breaking the command ring protocol if it wants, but in | |
62 | * order to prevent other issues we must only ever read *data* from | |
63 | * the shared memory area, not offsets or sizes. This applies to | |
64 | * command ring entries as well as the mailbox. Extra code needed for | |
65 | * this may have a 'UAM' comment. | |
66 | */ | |
67 | ||
7c9e7a6f AG |
68 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
69 | ||
141685a3 XL |
70 | /* For cmd area, the size is fixed 2M */ |
71 | #define CMDR_SIZE (2 * 1024 * 1024) | |
26418649 | 72 | |
141685a3 XL |
73 | /* For data area, the size is fixed 32M */ |
74 | #define DATA_BLOCK_BITS (8 * 1024) | |
75 | #define DATA_BLOCK_SIZE 4096 | |
26418649 | 76 | #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) |
7c9e7a6f | 77 | |
141685a3 | 78 | /* The ring buffer size is 34M */ |
7c9e7a6f AG |
79 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) |
80 | ||
81 | static struct device *tcmu_root_device; | |
82 | ||
83 | struct tcmu_hba { | |
84 | u32 host_id; | |
85 | }; | |
86 | ||
7c9e7a6f AG |
87 | #define TCMU_CONFIG_LEN 256 |
88 | ||
89 | struct tcmu_dev { | |
90 | struct se_device se_dev; | |
91 | ||
92 | char *name; | |
93 | struct se_hba *hba; | |
94 | ||
95 | #define TCMU_DEV_BIT_OPEN 0 | |
96 | #define TCMU_DEV_BIT_BROKEN 1 | |
97 | unsigned long flags; | |
7c9e7a6f AG |
98 | |
99 | struct uio_info uio_info; | |
100 | ||
101 | struct tcmu_mailbox *mb_addr; | |
102 | size_t dev_size; | |
103 | u32 cmdr_size; | |
104 | u32 cmdr_last_cleaned; | |
3d9b9555 | 105 | /* Offset of data area from start of mb */ |
26418649 | 106 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f AG |
107 | size_t data_off; |
108 | size_t data_size; | |
26418649 | 109 | |
7c9e7a6f AG |
110 | wait_queue_head_t wait_cmdr; |
111 | /* TODO should this be a mutex? */ | |
112 | spinlock_t cmdr_lock; | |
113 | ||
141685a3 XL |
114 | uint32_t dbi_max; |
115 | DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); | |
116 | struct radix_tree_root data_blocks; | |
117 | ||
7c9e7a6f AG |
118 | struct idr commands; |
119 | spinlock_t commands_lock; | |
120 | ||
121 | struct timer_list timeout; | |
af980e46 | 122 | unsigned int cmd_time_out; |
7c9e7a6f AG |
123 | |
124 | char dev_config[TCMU_CONFIG_LEN]; | |
125 | }; | |
126 | ||
127 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
128 | ||
129 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
130 | ||
131 | struct tcmu_cmd { | |
132 | struct se_cmd *se_cmd; | |
133 | struct tcmu_dev *tcmu_dev; | |
134 | ||
135 | uint16_t cmd_id; | |
136 | ||
26418649 | 137 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 138 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
139 | uint32_t dbi_cnt; |
140 | uint32_t dbi_cur; | |
141 | uint32_t *dbi; | |
7c9e7a6f AG |
142 | |
143 | unsigned long deadline; | |
144 | ||
145 | #define TCMU_CMD_BIT_EXPIRED 0 | |
146 | unsigned long flags; | |
147 | }; | |
148 | ||
149 | static struct kmem_cache *tcmu_cmd_cache; | |
150 | ||
151 | /* multicast group */ | |
152 | enum tcmu_multicast_groups { | |
153 | TCMU_MCGRP_CONFIG, | |
154 | }; | |
155 | ||
156 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
157 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
158 | }; | |
159 | ||
160 | /* Our generic netlink family */ | |
56989f6d | 161 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 162 | .module = THIS_MODULE, |
7c9e7a6f AG |
163 | .hdrsize = 0, |
164 | .name = "TCM-USER", | |
165 | .version = 1, | |
166 | .maxattr = TCMU_ATTR_MAX, | |
167 | .mcgrps = tcmu_mcgrps, | |
168 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 169 | .netnsok = true, |
7c9e7a6f AG |
170 | }; |
171 | ||
141685a3 XL |
172 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
173 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
174 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
175 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
176 | ||
177 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd) | |
178 | { | |
179 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
180 | uint32_t i; | |
181 | ||
182 | for (i = 0; i < tcmu_cmd->dbi_cnt; i++) | |
183 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); | |
184 | } | |
185 | ||
186 | static int tcmu_get_empty_block(struct tcmu_dev *udev, void **addr) | |
187 | { | |
188 | void *p; | |
189 | uint32_t dbi; | |
190 | int ret; | |
191 | ||
192 | dbi = find_first_zero_bit(udev->data_bitmap, DATA_BLOCK_BITS); | |
193 | if (dbi > udev->dbi_max) | |
194 | udev->dbi_max = dbi; | |
195 | ||
196 | set_bit(dbi, udev->data_bitmap); | |
197 | ||
198 | p = radix_tree_lookup(&udev->data_blocks, dbi); | |
199 | if (!p) { | |
200 | p = kzalloc(DATA_BLOCK_SIZE, GFP_ATOMIC); | |
201 | if (!p) { | |
202 | clear_bit(dbi, udev->data_bitmap); | |
203 | return -ENOMEM; | |
204 | } | |
205 | ||
206 | ret = radix_tree_insert(&udev->data_blocks, dbi, p); | |
207 | if (ret) { | |
208 | kfree(p); | |
209 | clear_bit(dbi, udev->data_bitmap); | |
210 | return ret; | |
211 | } | |
212 | } | |
213 | ||
214 | *addr = p; | |
215 | return dbi; | |
216 | } | |
217 | ||
218 | static void *tcmu_get_block_addr(struct tcmu_dev *udev, uint32_t dbi) | |
219 | { | |
220 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
221 | } | |
222 | ||
223 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
224 | { | |
225 | kfree(tcmu_cmd->dbi); | |
226 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
227 | } | |
228 | ||
229 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
230 | { | |
231 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
232 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
233 | ||
234 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
235 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
236 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
237 | DATA_BLOCK_SIZE); | |
238 | } | |
239 | ||
240 | return data_length; | |
241 | } | |
242 | ||
243 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
244 | { | |
245 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
246 | ||
247 | return data_length / DATA_BLOCK_SIZE; | |
248 | } | |
249 | ||
7c9e7a6f AG |
250 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
251 | { | |
252 | struct se_device *se_dev = se_cmd->se_dev; | |
253 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
254 | struct tcmu_cmd *tcmu_cmd; | |
255 | int cmd_id; | |
256 | ||
257 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
258 | if (!tcmu_cmd) | |
259 | return NULL; | |
260 | ||
261 | tcmu_cmd->se_cmd = se_cmd; | |
262 | tcmu_cmd->tcmu_dev = udev; | |
af980e46 MC |
263 | if (udev->cmd_time_out) |
264 | tcmu_cmd->deadline = jiffies + | |
265 | msecs_to_jiffies(udev->cmd_time_out); | |
7c9e7a6f | 266 | |
141685a3 XL |
267 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
268 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
269 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
270 | GFP_KERNEL); | |
271 | if (!tcmu_cmd->dbi) { | |
272 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
273 | return NULL; | |
274 | } | |
275 | ||
7c9e7a6f AG |
276 | idr_preload(GFP_KERNEL); |
277 | spin_lock_irq(&udev->commands_lock); | |
278 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
279 | USHRT_MAX, GFP_NOWAIT); | |
280 | spin_unlock_irq(&udev->commands_lock); | |
281 | idr_preload_end(); | |
282 | ||
283 | if (cmd_id < 0) { | |
141685a3 | 284 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
285 | return NULL; |
286 | } | |
287 | tcmu_cmd->cmd_id = cmd_id; | |
288 | ||
289 | return tcmu_cmd; | |
290 | } | |
291 | ||
292 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
293 | { | |
b75d8063 | 294 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
295 | |
296 | size = round_up(size+offset, PAGE_SIZE); | |
297 | vaddr -= offset; | |
298 | ||
299 | while (size) { | |
300 | flush_dcache_page(virt_to_page(vaddr)); | |
301 | size -= PAGE_SIZE; | |
302 | } | |
303 | } | |
304 | ||
305 | /* | |
306 | * Some ring helper functions. We don't assume size is a power of 2 so | |
307 | * we can't use circ_buf.h. | |
308 | */ | |
309 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
310 | { | |
311 | int diff = head - tail; | |
312 | ||
313 | if (diff >= 0) | |
314 | return diff; | |
315 | else | |
316 | return size + diff; | |
317 | } | |
318 | ||
319 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
320 | { | |
321 | /* Keep 1 byte unused or we can't tell full from empty */ | |
322 | return (size - spc_used(head, tail, size) - 1); | |
323 | } | |
324 | ||
325 | static inline size_t head_to_end(size_t head, size_t size) | |
326 | { | |
327 | return size - head; | |
328 | } | |
329 | ||
f1dbd087 SY |
330 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
331 | struct tcmu_dev *udev) | |
332 | { | |
333 | struct iovec *iovec; | |
334 | ||
335 | if (*iov_cnt != 0) | |
336 | (*iov)++; | |
337 | (*iov_cnt)++; | |
338 | ||
339 | iovec = *iov; | |
340 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
341 | } |
342 | ||
7c9e7a6f AG |
343 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
344 | ||
26418649 | 345 | /* offset is relative to mb_addr */ |
141685a3 XL |
346 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
347 | int dbi, int remaining) | |
26418649 | 348 | { |
141685a3 | 349 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
350 | DATA_BLOCK_SIZE - remaining; |
351 | } | |
352 | ||
353 | static inline size_t iov_tail(struct tcmu_dev *udev, struct iovec *iov) | |
354 | { | |
355 | return (size_t)iov->iov_base + iov->iov_len; | |
356 | } | |
357 | ||
141685a3 XL |
358 | static int alloc_and_scatter_data_area(struct tcmu_dev *udev, |
359 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, | |
360 | unsigned int data_nents, struct iovec **iov, | |
361 | int *iov_cnt, bool copy_data) | |
f97ec7db | 362 | { |
141685a3 | 363 | int i, dbi; |
26418649 | 364 | int block_remaining = 0; |
141685a3 XL |
365 | void *from, *to = NULL; |
366 | size_t copy_bytes, to_offset, offset; | |
f97ec7db IT |
367 | struct scatterlist *sg; |
368 | ||
369 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 370 | int sg_remaining = sg->length; |
f97ec7db | 371 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
372 | while (sg_remaining > 0) { |
373 | if (block_remaining == 0) { | |
26418649 | 374 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 XL |
375 | dbi = tcmu_get_empty_block(udev, &to); |
376 | if (dbi < 0) { | |
377 | kunmap_atomic(from - sg->offset); | |
378 | return dbi; | |
379 | } | |
380 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
26418649 | 381 | } |
141685a3 | 382 | |
26418649 SY |
383 | copy_bytes = min_t(size_t, sg_remaining, |
384 | block_remaining); | |
141685a3 | 385 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 386 | block_remaining); |
141685a3 XL |
387 | offset = DATA_BLOCK_SIZE - block_remaining; |
388 | to = (void *)(unsigned long)to + offset; | |
389 | ||
26418649 SY |
390 | if (*iov_cnt != 0 && |
391 | to_offset == iov_tail(udev, *iov)) { | |
392 | (*iov)->iov_len += copy_bytes; | |
393 | } else { | |
394 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 395 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
396 | (*iov)->iov_len = copy_bytes; |
397 | } | |
f97ec7db | 398 | if (copy_data) { |
26418649 SY |
399 | memcpy(to, from + sg->length - sg_remaining, |
400 | copy_bytes); | |
f97ec7db IT |
401 | tcmu_flush_dcache_range(to, copy_bytes); |
402 | } | |
26418649 SY |
403 | sg_remaining -= copy_bytes; |
404 | block_remaining -= copy_bytes; | |
f97ec7db | 405 | } |
e2e21bd8 | 406 | kunmap_atomic(from - sg->offset); |
f97ec7db | 407 | } |
f97ec7db | 408 | |
141685a3 | 409 | return 0; |
0c28481f SY |
410 | } |
411 | ||
a5d68ba8 XL |
412 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
413 | bool bidi) | |
f97ec7db | 414 | { |
a5d68ba8 | 415 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 416 | int i, dbi; |
26418649 | 417 | int block_remaining = 0; |
f97ec7db | 418 | void *from, *to; |
141685a3 | 419 | size_t copy_bytes, offset; |
a5d68ba8 XL |
420 | struct scatterlist *sg, *data_sg; |
421 | unsigned int data_nents; | |
141685a3 | 422 | uint32_t count = 0; |
a5d68ba8 XL |
423 | |
424 | if (!bidi) { | |
425 | data_sg = se_cmd->t_data_sg; | |
426 | data_nents = se_cmd->t_data_nents; | |
427 | } else { | |
a5d68ba8 XL |
428 | |
429 | /* | |
430 | * For bidi case, the first count blocks are for Data-Out | |
431 | * buffer blocks, and before gathering the Data-In buffer | |
432 | * the Data-Out buffer blocks should be discarded. | |
433 | */ | |
434 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
435 | |
436 | data_sg = se_cmd->t_bidi_data_sg; | |
437 | data_nents = se_cmd->t_bidi_data_nents; | |
438 | } | |
f97ec7db | 439 | |
141685a3 XL |
440 | tcmu_cmd_set_dbi_cur(cmd, count); |
441 | ||
f97ec7db | 442 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 443 | int sg_remaining = sg->length; |
f97ec7db | 444 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
445 | while (sg_remaining > 0) { |
446 | if (block_remaining == 0) { | |
26418649 | 447 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 XL |
448 | dbi = tcmu_cmd_get_dbi(cmd); |
449 | from = tcmu_get_block_addr(udev, dbi); | |
26418649 SY |
450 | } |
451 | copy_bytes = min_t(size_t, sg_remaining, | |
452 | block_remaining); | |
141685a3 XL |
453 | offset = DATA_BLOCK_SIZE - block_remaining; |
454 | from = (void *)(unsigned long)from + offset; | |
f97ec7db | 455 | tcmu_flush_dcache_range(from, copy_bytes); |
26418649 SY |
456 | memcpy(to + sg->length - sg_remaining, from, |
457 | copy_bytes); | |
f97ec7db | 458 | |
26418649 SY |
459 | sg_remaining -= copy_bytes; |
460 | block_remaining -= copy_bytes; | |
f97ec7db | 461 | } |
e2e21bd8 | 462 | kunmap_atomic(to - sg->offset); |
f97ec7db IT |
463 | } |
464 | } | |
465 | ||
26418649 SY |
466 | static inline size_t spc_bitmap_free(unsigned long *bitmap) |
467 | { | |
468 | return DATA_BLOCK_SIZE * (DATA_BLOCK_BITS - | |
469 | bitmap_weight(bitmap, DATA_BLOCK_BITS)); | |
470 | } | |
471 | ||
7c9e7a6f | 472 | /* |
f97ec7db | 473 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 474 | * space available on the data area. |
7c9e7a6f AG |
475 | * |
476 | * Called with ring lock held. | |
477 | */ | |
f56574a2 | 478 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) |
7c9e7a6f AG |
479 | { |
480 | struct tcmu_mailbox *mb = udev->mb_addr; | |
0241fd39 | 481 | size_t space, cmd_needed; |
7c9e7a6f AG |
482 | u32 cmd_head; |
483 | ||
484 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
485 | ||
486 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
487 | ||
f56574a2 AG |
488 | /* |
489 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
490 | * original cmd - cmds are internally contiguous. | |
491 | */ | |
492 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
493 | cmd_needed = cmd_size; | |
494 | else | |
495 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
496 | ||
7c9e7a6f AG |
497 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
498 | if (space < cmd_needed) { | |
499 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
500 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
501 | return false; | |
502 | } | |
503 | ||
26418649 | 504 | space = spc_bitmap_free(udev->data_bitmap); |
7c9e7a6f | 505 | if (space < data_needed) { |
0241fd39 | 506 | pr_debug("no data space: only %zu available, but ask for %zu\n", |
26418649 | 507 | space, data_needed); |
7c9e7a6f AG |
508 | return false; |
509 | } | |
510 | ||
511 | return true; | |
512 | } | |
513 | ||
02eb924f AG |
514 | static sense_reason_t |
515 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
516 | { |
517 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
518 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
519 | size_t base_command_size, command_size; | |
7c9e7a6f | 520 | struct tcmu_mailbox *mb; |
7c9e7a6f | 521 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 522 | struct iovec *iov; |
141685a3 | 523 | int iov_cnt, ret; |
7c9e7a6f AG |
524 | uint32_t cmd_head; |
525 | uint64_t cdb_off; | |
f97ec7db | 526 | bool copy_to_data_area; |
ab22d260 | 527 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
528 | |
529 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 530 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
531 | |
532 | /* | |
533 | * Must be a certain minimum size for response sense info, but | |
534 | * also may be larger if the iov array is large. | |
535 | * | |
26418649 SY |
536 | * We prepare way too many iovs for potential uses here, because it's |
537 | * expensive to tell how many regions are freed in the bitmap | |
7c9e7a6f | 538 | */ |
26418649 | 539 | base_command_size = max(offsetof(struct tcmu_cmd_entry, |
abe342a5 | 540 | req.iov[tcmu_cmd_get_block_cnt(tcmu_cmd)]), |
7c9e7a6f AG |
541 | sizeof(struct tcmu_cmd_entry)); |
542 | command_size = base_command_size | |
543 | + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); | |
544 | ||
545 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
546 | ||
547 | spin_lock_irq(&udev->cmdr_lock); | |
548 | ||
549 | mb = udev->mb_addr; | |
550 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
551 | if ((command_size > (udev->cmdr_size / 2)) || |
552 | data_length > udev->data_size) { | |
553 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 554 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 555 | udev->cmdr_size, udev->data_size); |
554617b2 AG |
556 | spin_unlock_irq(&udev->cmdr_lock); |
557 | return TCM_INVALID_CDB_FIELD; | |
558 | } | |
7c9e7a6f | 559 | |
26418649 | 560 | while (!is_ring_space_avail(udev, command_size, data_length)) { |
7c9e7a6f AG |
561 | int ret; |
562 | DEFINE_WAIT(__wait); | |
563 | ||
564 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
565 | ||
566 | pr_debug("sleeping for ring space\n"); | |
567 | spin_unlock_irq(&udev->cmdr_lock); | |
af980e46 MC |
568 | if (udev->cmd_time_out) |
569 | ret = schedule_timeout( | |
570 | msecs_to_jiffies(udev->cmd_time_out)); | |
571 | else | |
572 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
573 | finish_wait(&udev->wait_cmdr, &__wait); |
574 | if (!ret) { | |
575 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 576 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
577 | } |
578 | ||
579 | spin_lock_irq(&udev->cmdr_lock); | |
580 | ||
581 | /* We dropped cmdr_lock, cmd_head is stale */ | |
582 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
583 | } | |
584 | ||
f56574a2 AG |
585 | /* Insert a PAD if end-of-ring space is too small */ |
586 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
587 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
588 | ||
7c9e7a6f AG |
589 | entry = (void *) mb + CMDR_OFF + cmd_head; |
590 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
591 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
592 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
593 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
594 | entry->hdr.kflags = 0; | |
595 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
596 | |
597 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
598 | ||
599 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
600 | WARN_ON(cmd_head != 0); | |
601 | } | |
602 | ||
603 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
604 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
605 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
606 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
607 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
608 | entry->hdr.kflags = 0; | |
609 | entry->hdr.uflags = 0; | |
7c9e7a6f | 610 | |
3d9b9555 | 611 | /* Handle allocating space from the data area */ |
7c9e7a6f | 612 | iov = &entry->req.iov[0]; |
f97ec7db | 613 | iov_cnt = 0; |
e4648b01 IT |
614 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
615 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
141685a3 XL |
616 | ret = alloc_and_scatter_data_area(udev, tcmu_cmd, |
617 | se_cmd->t_data_sg, se_cmd->t_data_nents, | |
618 | &iov, &iov_cnt, copy_to_data_area); | |
619 | if (ret) { | |
620 | spin_unlock_irq(&udev->cmdr_lock); | |
621 | pr_err("tcmu: alloc and scatter data failed\n"); | |
622 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
623 | } | |
7c9e7a6f | 624 | entry->req.iov_cnt = iov_cnt; |
0ad46af8 | 625 | entry->req.iov_dif_cnt = 0; |
7c9e7a6f | 626 | |
e4648b01 | 627 | /* Handle BIDI commands */ |
ab22d260 XL |
628 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
629 | iov_cnt = 0; | |
630 | iov++; | |
141685a3 XL |
631 | ret = alloc_and_scatter_data_area(udev, tcmu_cmd, |
632 | se_cmd->t_bidi_data_sg, | |
633 | se_cmd->t_bidi_data_nents, | |
634 | &iov, &iov_cnt, false); | |
635 | if (ret) { | |
636 | spin_unlock_irq(&udev->cmdr_lock); | |
637 | pr_err("tcmu: alloc and scatter bidi data failed\n"); | |
638 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
639 | } | |
ab22d260 XL |
640 | entry->req.iov_bidi_cnt = iov_cnt; |
641 | } | |
26418649 | 642 | |
7c9e7a6f AG |
643 | /* All offsets relative to mb_addr, not start of entry! */ |
644 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
645 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
646 | entry->req.cdb_off = cdb_off; | |
647 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
648 | ||
649 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
650 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
651 | ||
652 | spin_unlock_irq(&udev->cmdr_lock); | |
653 | ||
654 | /* TODO: only if FLUSH and FUA? */ | |
655 | uio_event_notify(&udev->uio_info); | |
656 | ||
af980e46 MC |
657 | if (udev->cmd_time_out) |
658 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
659 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 660 | |
02eb924f | 661 | return TCM_NO_SENSE; |
7c9e7a6f AG |
662 | } |
663 | ||
02eb924f AG |
664 | static sense_reason_t |
665 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f AG |
666 | { |
667 | struct se_device *se_dev = se_cmd->se_dev; | |
668 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
669 | struct tcmu_cmd *tcmu_cmd; | |
ecaf597b | 670 | sense_reason_t ret; |
7c9e7a6f AG |
671 | |
672 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
673 | if (!tcmu_cmd) | |
02eb924f | 674 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
675 | |
676 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 677 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f AG |
678 | pr_err("TCMU: Could not queue command\n"); |
679 | spin_lock_irq(&udev->commands_lock); | |
680 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
681 | spin_unlock_irq(&udev->commands_lock); | |
682 | ||
141685a3 | 683 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
684 | } |
685 | ||
686 | return ret; | |
687 | } | |
688 | ||
689 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
690 | { | |
691 | struct se_cmd *se_cmd = cmd->se_cmd; | |
692 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
693 | ||
141685a3 XL |
694 | /* |
695 | * cmd has been completed already from timeout, just reclaim | |
696 | * data area space and free cmd | |
697 | */ | |
698 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
699 | goto out; | |
b25c7863 | 700 | |
141685a3 | 701 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 702 | |
0ad46af8 | 703 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
704 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
705 | cmd->se_cmd); | |
ed97d0cd AG |
706 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
707 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
7c9e7a6f AG |
708 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, |
709 | se_cmd->scsi_sense_length); | |
e4648b01 | 710 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 711 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 712 | gather_data_area(udev, cmd, true); |
e4648b01 | 713 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 714 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 715 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 716 | /* TODO: */ |
2bc396a2 IT |
717 | } else if (se_cmd->data_direction != DMA_NONE) { |
718 | pr_warn("TCMU: data direction was %d!\n", | |
719 | se_cmd->data_direction); | |
7c9e7a6f AG |
720 | } |
721 | ||
722 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 723 | |
141685a3 XL |
724 | out: |
725 | cmd->se_cmd = NULL; | |
726 | tcmu_cmd_free_data(cmd); | |
727 | tcmu_free_cmd(cmd); | |
7c9e7a6f AG |
728 | } |
729 | ||
730 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
731 | { | |
732 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
733 | unsigned long flags; |
734 | int handled = 0; | |
735 | ||
736 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
737 | pr_err("ring broken, not handling completions\n"); | |
738 | return 0; | |
739 | } | |
740 | ||
741 | spin_lock_irqsave(&udev->cmdr_lock, flags); | |
742 | ||
743 | mb = udev->mb_addr; | |
744 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
745 | ||
746 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
747 | ||
748 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
749 | struct tcmu_cmd *cmd; | |
750 | ||
751 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
752 | ||
0ad46af8 AG |
753 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
754 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
755 | tcmu_hdr_get_len(entry->hdr.len_op), | |
756 | udev->cmdr_size); | |
7c9e7a6f AG |
757 | continue; |
758 | } | |
0ad46af8 | 759 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
760 | |
761 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 762 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
763 | spin_unlock(&udev->commands_lock); |
764 | ||
765 | if (!cmd) { | |
766 | pr_err("cmd_id not found, ring is broken\n"); | |
767 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
768 | break; | |
769 | } | |
770 | ||
771 | tcmu_handle_completion(cmd, entry); | |
772 | ||
0ad46af8 AG |
773 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
774 | tcmu_hdr_get_len(entry->hdr.len_op), | |
775 | udev->cmdr_size); | |
7c9e7a6f AG |
776 | |
777 | handled++; | |
778 | } | |
779 | ||
780 | if (mb->cmd_tail == mb->cmd_head) | |
781 | del_timer(&udev->timeout); /* no more pending cmds */ | |
782 | ||
783 | spin_unlock_irqrestore(&udev->cmdr_lock, flags); | |
784 | ||
785 | wake_up(&udev->wait_cmdr); | |
786 | ||
787 | return handled; | |
788 | } | |
789 | ||
790 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
791 | { | |
792 | struct tcmu_cmd *cmd = p; | |
793 | ||
794 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
795 | return 0; | |
796 | ||
611e2267 | 797 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
798 | return 0; |
799 | ||
800 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
801 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
802 | cmd->se_cmd = NULL; | |
803 | ||
7c9e7a6f AG |
804 | return 0; |
805 | } | |
806 | ||
807 | static void tcmu_device_timedout(unsigned long data) | |
808 | { | |
809 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
810 | unsigned long flags; | |
811 | int handled; | |
812 | ||
813 | handled = tcmu_handle_completions(udev); | |
814 | ||
815 | pr_warn("%d completions handled from timeout\n", handled); | |
816 | ||
817 | spin_lock_irqsave(&udev->commands_lock, flags); | |
818 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
819 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
820 | ||
821 | /* | |
822 | * We don't need to wakeup threads on wait_cmdr since they have their | |
823 | * own timeout. | |
824 | */ | |
825 | } | |
826 | ||
827 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
828 | { | |
829 | struct tcmu_hba *tcmu_hba; | |
830 | ||
831 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
832 | if (!tcmu_hba) | |
833 | return -ENOMEM; | |
834 | ||
835 | tcmu_hba->host_id = host_id; | |
836 | hba->hba_ptr = tcmu_hba; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | static void tcmu_detach_hba(struct se_hba *hba) | |
842 | { | |
843 | kfree(hba->hba_ptr); | |
844 | hba->hba_ptr = NULL; | |
845 | } | |
846 | ||
847 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
848 | { | |
849 | struct tcmu_dev *udev; | |
850 | ||
851 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
852 | if (!udev) | |
853 | return NULL; | |
854 | ||
855 | udev->name = kstrdup(name, GFP_KERNEL); | |
856 | if (!udev->name) { | |
857 | kfree(udev); | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | udev->hba = hba; | |
af980e46 | 862 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
863 | |
864 | init_waitqueue_head(&udev->wait_cmdr); | |
865 | spin_lock_init(&udev->cmdr_lock); | |
866 | ||
867 | idr_init(&udev->commands); | |
868 | spin_lock_init(&udev->commands_lock); | |
869 | ||
870 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
871 | (unsigned long)udev); | |
872 | ||
7c9e7a6f AG |
873 | return &udev->se_dev; |
874 | } | |
875 | ||
876 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
877 | { | |
878 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
879 | ||
880 | tcmu_handle_completions(tcmu_dev); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
141685a3 XL |
885 | static void tcmu_blocks_release(struct tcmu_dev *udev, bool release_pending) |
886 | { | |
887 | uint32_t dbi, end; | |
888 | void *addr; | |
889 | ||
890 | spin_lock_irq(&udev->cmdr_lock); | |
891 | ||
892 | end = udev->dbi_max + 1; | |
893 | ||
894 | /* try to release all unused blocks */ | |
895 | dbi = find_first_zero_bit(udev->data_bitmap, end); | |
896 | if (dbi >= end) { | |
897 | spin_unlock_irq(&udev->cmdr_lock); | |
898 | return; | |
899 | } | |
900 | do { | |
901 | addr = radix_tree_delete(&udev->data_blocks, dbi); | |
902 | kfree(addr); | |
903 | ||
904 | dbi = find_next_zero_bit(udev->data_bitmap, end, dbi + 1); | |
905 | } while (dbi < end); | |
906 | ||
907 | if (!release_pending) | |
908 | return; | |
909 | ||
910 | /* try to release all pending blocks */ | |
911 | dbi = find_first_bit(udev->data_bitmap, end); | |
912 | if (dbi >= end) { | |
913 | spin_unlock_irq(&udev->cmdr_lock); | |
914 | return; | |
915 | } | |
916 | do { | |
917 | addr = radix_tree_delete(&udev->data_blocks, dbi); | |
918 | kfree(addr); | |
919 | ||
920 | dbi = find_next_bit(udev->data_bitmap, end, dbi + 1); | |
921 | } while (dbi < end); | |
922 | ||
923 | spin_unlock_irq(&udev->cmdr_lock); | |
924 | } | |
925 | ||
926 | static void tcmu_vma_close(struct vm_area_struct *vma) | |
927 | { | |
928 | struct tcmu_dev *udev = vma->vm_private_data; | |
929 | ||
930 | tcmu_blocks_release(udev, false); | |
931 | } | |
932 | ||
7c9e7a6f AG |
933 | /* |
934 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
935 | * and this stuff must come along. | |
936 | */ | |
937 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
938 | { | |
939 | struct tcmu_dev *udev = vma->vm_private_data; | |
940 | struct uio_info *info = &udev->uio_info; | |
941 | ||
942 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
943 | if (info->mem[vma->vm_pgoff].size == 0) | |
944 | return -1; | |
945 | return (int)vma->vm_pgoff; | |
946 | } | |
947 | return -1; | |
948 | } | |
949 | ||
11bac800 | 950 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 951 | { |
11bac800 | 952 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
953 | struct uio_info *info = &udev->uio_info; |
954 | struct page *page; | |
955 | unsigned long offset; | |
956 | void *addr; | |
957 | ||
11bac800 | 958 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
959 | if (mi < 0) |
960 | return VM_FAULT_SIGBUS; | |
961 | ||
962 | /* | |
963 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
964 | * to use mem[N]. | |
965 | */ | |
966 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
967 | ||
141685a3 XL |
968 | if (offset < udev->data_off) { |
969 | /* For the vmalloc()ed cmd area pages */ | |
970 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 971 | page = vmalloc_to_page(addr); |
141685a3 XL |
972 | } else { |
973 | /* For the dynamically growing data area pages */ | |
974 | uint32_t dbi; | |
975 | ||
976 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; | |
977 | addr = tcmu_get_block_addr(udev, dbi); | |
978 | if (!addr) | |
979 | return VM_FAULT_NOPAGE; | |
980 | page = virt_to_page(addr); | |
981 | } | |
982 | ||
7c9e7a6f AG |
983 | get_page(page); |
984 | vmf->page = page; | |
985 | return 0; | |
986 | } | |
987 | ||
988 | static const struct vm_operations_struct tcmu_vm_ops = { | |
141685a3 | 989 | .close = tcmu_vma_close, |
7c9e7a6f AG |
990 | .fault = tcmu_vma_fault, |
991 | }; | |
992 | ||
993 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
994 | { | |
995 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
996 | ||
997 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
998 | vma->vm_ops = &tcmu_vm_ops; | |
999 | ||
1000 | vma->vm_private_data = udev; | |
1001 | ||
1002 | /* Ensure the mmap is exactly the right size */ | |
1003 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1004 | return -EINVAL; | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1010 | { | |
1011 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1012 | ||
1013 | /* O_EXCL not supported for char devs, so fake it? */ | |
1014 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1015 | return -EBUSY; | |
1016 | ||
1017 | pr_debug("open\n"); | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
1023 | { | |
1024 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1025 | ||
1026 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1027 | ||
1028 | pr_debug("close\n"); | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) | |
1034 | { | |
1035 | struct sk_buff *skb; | |
1036 | void *msg_header; | |
6e14eab9 | 1037 | int ret = -ENOMEM; |
7c9e7a6f AG |
1038 | |
1039 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1040 | if (!skb) | |
6e14eab9 | 1041 | return ret; |
7c9e7a6f AG |
1042 | |
1043 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1044 | if (!msg_header) |
1045 | goto free_skb; | |
7c9e7a6f AG |
1046 | |
1047 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); | |
6e14eab9 NB |
1048 | if (ret < 0) |
1049 | goto free_skb; | |
7c9e7a6f AG |
1050 | |
1051 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); | |
6e14eab9 NB |
1052 | if (ret < 0) |
1053 | goto free_skb; | |
7c9e7a6f | 1054 | |
053c095a | 1055 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1056 | |
20c08b36 | 1057 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f AG |
1058 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
1059 | ||
1060 | /* We don't care if no one is listening */ | |
1061 | if (ret == -ESRCH) | |
1062 | ret = 0; | |
1063 | ||
1064 | return ret; | |
6e14eab9 NB |
1065 | free_skb: |
1066 | nlmsg_free(skb); | |
1067 | return ret; | |
7c9e7a6f AG |
1068 | } |
1069 | ||
1070 | static int tcmu_configure_device(struct se_device *dev) | |
1071 | { | |
1072 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1073 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
1074 | struct uio_info *info; | |
1075 | struct tcmu_mailbox *mb; | |
1076 | size_t size; | |
1077 | size_t used; | |
1078 | int ret = 0; | |
1079 | char *str; | |
1080 | ||
1081 | info = &udev->uio_info; | |
1082 | ||
1083 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
1084 | udev->dev_config); | |
1085 | size += 1; /* for \0 */ | |
1086 | str = kmalloc(size, GFP_KERNEL); | |
1087 | if (!str) | |
1088 | return -ENOMEM; | |
1089 | ||
1090 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
1091 | ||
1092 | if (udev->dev_config[0]) | |
1093 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1094 | ||
1095 | info->name = str; | |
1096 | ||
141685a3 | 1097 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1098 | if (!udev->mb_addr) { |
1099 | ret = -ENOMEM; | |
1100 | goto err_vzalloc; | |
1101 | } | |
1102 | ||
1103 | /* mailbox fits in first part of CMDR space */ | |
1104 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1105 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1106 | udev->data_size = DATA_SIZE; |
7c9e7a6f | 1107 | |
141685a3 | 1108 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1109 | mb = udev->mb_addr; |
0ad46af8 | 1110 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1111 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1112 | mb->cmdr_off = CMDR_OFF; |
1113 | mb->cmdr_size = udev->cmdr_size; | |
1114 | ||
1115 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1116 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1117 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1118 | |
141685a3 XL |
1119 | INIT_RADIX_TREE(&udev->data_blocks, GFP_ATOMIC); |
1120 | ||
ac64a2ce | 1121 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1122 | |
1123 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1124 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1125 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1126 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1127 | |
1128 | info->irqcontrol = tcmu_irqcontrol; | |
1129 | info->irq = UIO_IRQ_CUSTOM; | |
1130 | ||
1131 | info->mmap = tcmu_mmap; | |
1132 | info->open = tcmu_open; | |
1133 | info->release = tcmu_release; | |
1134 | ||
1135 | ret = uio_register_device(tcmu_root_device, info); | |
1136 | if (ret) | |
1137 | goto err_register; | |
1138 | ||
81ee28de SY |
1139 | /* User can set hw_block_size before enable the device */ |
1140 | if (dev->dev_attrib.hw_block_size == 0) | |
1141 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1142 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1143 | if (!dev->dev_attrib.hw_max_sectors) |
1144 | dev->dev_attrib.hw_max_sectors = 128; | |
7c9e7a6f AG |
1145 | dev->dev_attrib.hw_queue_depth = 128; |
1146 | ||
1147 | ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, | |
1148 | udev->uio_info.uio_dev->minor); | |
1149 | if (ret) | |
1150 | goto err_netlink; | |
1151 | ||
1152 | return 0; | |
1153 | ||
1154 | err_netlink: | |
1155 | uio_unregister_device(&udev->uio_info); | |
1156 | err_register: | |
1157 | vfree(udev->mb_addr); | |
1158 | err_vzalloc: | |
1159 | kfree(info->name); | |
1160 | ||
1161 | return ret; | |
1162 | } | |
1163 | ||
b25c7863 | 1164 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
7c9e7a6f | 1165 | { |
b25c7863 SY |
1166 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
1167 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
7c9e7a6f | 1168 | return 0; |
b25c7863 | 1169 | } |
7c9e7a6f AG |
1170 | return -EINVAL; |
1171 | } | |
1172 | ||
4cc987ea NB |
1173 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1174 | { | |
1175 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1176 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1177 | ||
1178 | kfree(udev); | |
1179 | } | |
1180 | ||
972c7f16 MC |
1181 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1182 | { | |
1183 | return udev->uio_info.uio_dev ? true : false; | |
1184 | } | |
1185 | ||
7c9e7a6f AG |
1186 | static void tcmu_free_device(struct se_device *dev) |
1187 | { | |
1188 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
b25c7863 SY |
1189 | struct tcmu_cmd *cmd; |
1190 | bool all_expired = true; | |
7c9e7a6f AG |
1191 | int i; |
1192 | ||
1193 | del_timer_sync(&udev->timeout); | |
1194 | ||
1195 | vfree(udev->mb_addr); | |
1196 | ||
1197 | /* Upper layer should drain all requests before calling this */ | |
1198 | spin_lock_irq(&udev->commands_lock); | |
b25c7863 SY |
1199 | idr_for_each_entry(&udev->commands, cmd, i) { |
1200 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1201 | all_expired = false; | |
1202 | } | |
7c9e7a6f AG |
1203 | idr_destroy(&udev->commands); |
1204 | spin_unlock_irq(&udev->commands_lock); | |
b25c7863 | 1205 | WARN_ON(!all_expired); |
7c9e7a6f | 1206 | |
141685a3 XL |
1207 | tcmu_blocks_release(udev, true); |
1208 | ||
972c7f16 | 1209 | if (tcmu_dev_configured(udev)) { |
7c9e7a6f AG |
1210 | tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, |
1211 | udev->uio_info.uio_dev->minor); | |
1212 | ||
1213 | uio_unregister_device(&udev->uio_info); | |
1214 | kfree(udev->uio_info.name); | |
1215 | kfree(udev->name); | |
1216 | } | |
4cc987ea | 1217 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); |
7c9e7a6f AG |
1218 | } |
1219 | ||
1220 | enum { | |
3abaa2bf | 1221 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
7d7a7435 | 1222 | Opt_err, |
7c9e7a6f AG |
1223 | }; |
1224 | ||
1225 | static match_table_t tokens = { | |
1226 | {Opt_dev_config, "dev_config=%s"}, | |
1227 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1228 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1229 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
7c9e7a6f AG |
1230 | {Opt_err, NULL} |
1231 | }; | |
1232 | ||
3abaa2bf MC |
1233 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1234 | { | |
1235 | unsigned long tmp_ul; | |
1236 | char *arg_p; | |
1237 | int ret; | |
1238 | ||
1239 | arg_p = match_strdup(arg); | |
1240 | if (!arg_p) | |
1241 | return -ENOMEM; | |
1242 | ||
1243 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1244 | kfree(arg_p); | |
1245 | if (ret < 0) { | |
1246 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1247 | return ret; | |
1248 | } | |
1249 | if (!tmp_ul) { | |
1250 | pr_err("dev attrib must be nonzero\n"); | |
1251 | return -EINVAL; | |
1252 | } | |
1253 | *dev_attrib = tmp_ul; | |
1254 | return 0; | |
1255 | } | |
1256 | ||
7c9e7a6f AG |
1257 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1258 | const char *page, ssize_t count) | |
1259 | { | |
1260 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1261 | char *orig, *ptr, *opts, *arg_p; | |
1262 | substring_t args[MAX_OPT_ARGS]; | |
1263 | int ret = 0, token; | |
7c9e7a6f AG |
1264 | |
1265 | opts = kstrdup(page, GFP_KERNEL); | |
1266 | if (!opts) | |
1267 | return -ENOMEM; | |
1268 | ||
1269 | orig = opts; | |
1270 | ||
1271 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1272 | if (!*ptr) | |
1273 | continue; | |
1274 | ||
1275 | token = match_token(ptr, tokens, args); | |
1276 | switch (token) { | |
1277 | case Opt_dev_config: | |
1278 | if (match_strlcpy(udev->dev_config, &args[0], | |
1279 | TCMU_CONFIG_LEN) == 0) { | |
1280 | ret = -EINVAL; | |
1281 | break; | |
1282 | } | |
1283 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1284 | break; | |
1285 | case Opt_dev_size: | |
1286 | arg_p = match_strdup(&args[0]); | |
1287 | if (!arg_p) { | |
1288 | ret = -ENOMEM; | |
1289 | break; | |
1290 | } | |
1291 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1292 | kfree(arg_p); | |
1293 | if (ret < 0) | |
1294 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1295 | break; | |
9c1cd1b6 | 1296 | case Opt_hw_block_size: |
3abaa2bf MC |
1297 | ret = tcmu_set_dev_attrib(&args[0], |
1298 | &(dev->dev_attrib.hw_block_size)); | |
1299 | break; | |
1300 | case Opt_hw_max_sectors: | |
1301 | ret = tcmu_set_dev_attrib(&args[0], | |
1302 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1303 | break; |
7c9e7a6f AG |
1304 | default: |
1305 | break; | |
1306 | } | |
2579325c MC |
1307 | |
1308 | if (ret) | |
1309 | break; | |
7c9e7a6f AG |
1310 | } |
1311 | ||
1312 | kfree(orig); | |
1313 | return (!ret) ? count : ret; | |
1314 | } | |
1315 | ||
1316 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1317 | { | |
1318 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1319 | ssize_t bl = 0; | |
1320 | ||
1321 | bl = sprintf(b + bl, "Config: %s ", | |
1322 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1323 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1324 | |
1325 | return bl; | |
1326 | } | |
1327 | ||
1328 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1329 | { | |
1330 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1331 | ||
1332 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1333 | dev->dev_attrib.block_size); | |
1334 | } | |
1335 | ||
7c9e7a6f | 1336 | static sense_reason_t |
9c1cd1b6 | 1337 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1338 | { |
02eb924f | 1339 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1340 | } |
1341 | ||
7d7a7435 NB |
1342 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1343 | { | |
1344 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1345 | struct se_dev_attrib, da_group); | |
1346 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1347 | struct tcmu_dev, se_dev); | |
1348 | ||
1349 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1350 | } | |
1351 | ||
1352 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1353 | size_t count) | |
1354 | { | |
1355 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1356 | struct se_dev_attrib, da_group); | |
1357 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1358 | struct tcmu_dev, se_dev); | |
1359 | u32 val; | |
1360 | int ret; | |
1361 | ||
1362 | if (da->da_dev->export_count) { | |
1363 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1364 | return -EINVAL; | |
1365 | } | |
1366 | ||
1367 | ret = kstrtou32(page, 0, &val); | |
1368 | if (ret < 0) | |
1369 | return ret; | |
1370 | ||
7d7a7435 NB |
1371 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1372 | return count; | |
1373 | } | |
1374 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1375 | ||
1376 | static struct configfs_attribute **tcmu_attrs; | |
1377 | ||
1378 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1379 | .name = "user", |
7c9e7a6f | 1380 | .owner = THIS_MODULE, |
a3541703 | 1381 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1382 | .attach_hba = tcmu_attach_hba, |
1383 | .detach_hba = tcmu_detach_hba, | |
1384 | .alloc_device = tcmu_alloc_device, | |
1385 | .configure_device = tcmu_configure_device, | |
1386 | .free_device = tcmu_free_device, | |
1387 | .parse_cdb = tcmu_parse_cdb, | |
1388 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1389 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1390 | .get_device_type = sbc_get_device_type, | |
1391 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1392 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1393 | }; |
1394 | ||
1395 | static int __init tcmu_module_init(void) | |
1396 | { | |
7d7a7435 | 1397 | int ret, i, len = 0; |
7c9e7a6f AG |
1398 | |
1399 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1400 | ||
1401 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1402 | sizeof(struct tcmu_cmd), | |
1403 | __alignof__(struct tcmu_cmd), | |
1404 | 0, NULL); | |
1405 | if (!tcmu_cmd_cache) | |
1406 | return -ENOMEM; | |
1407 | ||
1408 | tcmu_root_device = root_device_register("tcm_user"); | |
1409 | if (IS_ERR(tcmu_root_device)) { | |
1410 | ret = PTR_ERR(tcmu_root_device); | |
1411 | goto out_free_cache; | |
1412 | } | |
1413 | ||
1414 | ret = genl_register_family(&tcmu_genl_family); | |
1415 | if (ret < 0) { | |
1416 | goto out_unreg_device; | |
1417 | } | |
1418 | ||
7d7a7435 NB |
1419 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
1420 | len += sizeof(struct configfs_attribute *); | |
1421 | } | |
1422 | len += sizeof(struct configfs_attribute *) * 2; | |
1423 | ||
1424 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
1425 | if (!tcmu_attrs) { | |
1426 | ret = -ENOMEM; | |
1427 | goto out_unreg_genl; | |
1428 | } | |
1429 | ||
1430 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
1431 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
1432 | } | |
1433 | tcmu_attrs[i] = &tcmu_attr_cmd_time_out; | |
1434 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; | |
1435 | ||
0a06d430 | 1436 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 1437 | if (ret) |
7d7a7435 | 1438 | goto out_attrs; |
7c9e7a6f AG |
1439 | |
1440 | return 0; | |
1441 | ||
7d7a7435 NB |
1442 | out_attrs: |
1443 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
1444 | out_unreg_genl: |
1445 | genl_unregister_family(&tcmu_genl_family); | |
1446 | out_unreg_device: | |
1447 | root_device_unregister(tcmu_root_device); | |
1448 | out_free_cache: | |
1449 | kmem_cache_destroy(tcmu_cmd_cache); | |
1450 | ||
1451 | return ret; | |
1452 | } | |
1453 | ||
1454 | static void __exit tcmu_module_exit(void) | |
1455 | { | |
0a06d430 | 1456 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 1457 | kfree(tcmu_attrs); |
7c9e7a6f AG |
1458 | genl_unregister_family(&tcmu_genl_family); |
1459 | root_device_unregister(tcmu_root_device); | |
1460 | kmem_cache_destroy(tcmu_cmd_cache); | |
1461 | } | |
1462 | ||
1463 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
1464 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
1465 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
1466 | MODULE_LICENSE("GPL"); | |
1467 | ||
1468 | module_init(tcmu_module_init); | |
1469 | module_exit(tcmu_module_exit); |