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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> | |
23 | #include <linux/timer.h> | |
24 | #include <linux/parser.h> | |
25 | #include <scsi/scsi.h> | |
26 | #include <scsi/scsi_host.h> | |
27 | #include <linux/uio_driver.h> | |
28 | #include <net/genetlink.h> | |
29 | #include <target/target_core_base.h> | |
30 | #include <target/target_core_fabric.h> | |
31 | #include <target/target_core_backend.h> | |
e9f720d6 NB |
32 | #include <target/target_core_backend_configfs.h> |
33 | ||
7c9e7a6f AG |
34 | #include <linux/target_core_user.h> |
35 | ||
36 | /* | |
37 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
38 | * data to userspace for processing. This is to allow backends that | |
39 | * are too complex for in-kernel support to be possible. | |
40 | * | |
41 | * It uses the UIO framework to do a lot of the device-creation and | |
42 | * introspection work for us. | |
43 | * | |
44 | * See the .h file for how the ring is laid out. Note that while the | |
45 | * command ring is defined, the particulars of the data area are | |
46 | * not. Offset values in the command entry point to other locations | |
47 | * internal to the mmap()ed area. There is separate space outside the | |
48 | * command ring for data buffers. This leaves maximum flexibility for | |
49 | * moving buffer allocations, or even page flipping or other | |
50 | * allocation techniques, without altering the command ring layout. | |
51 | * | |
52 | * SECURITY: | |
53 | * The user process must be assumed to be malicious. There's no way to | |
54 | * prevent it breaking the command ring protocol if it wants, but in | |
55 | * order to prevent other issues we must only ever read *data* from | |
56 | * the shared memory area, not offsets or sizes. This applies to | |
57 | * command ring entries as well as the mailbox. Extra code needed for | |
58 | * this may have a 'UAM' comment. | |
59 | */ | |
60 | ||
61 | ||
62 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) | |
63 | ||
64 | #define CMDR_SIZE (16 * 4096) | |
65 | #define DATA_SIZE (257 * 4096) | |
66 | ||
67 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) | |
68 | ||
69 | static struct device *tcmu_root_device; | |
70 | ||
71 | struct tcmu_hba { | |
72 | u32 host_id; | |
73 | }; | |
74 | ||
7c9e7a6f AG |
75 | #define TCMU_CONFIG_LEN 256 |
76 | ||
77 | struct tcmu_dev { | |
78 | struct se_device se_dev; | |
79 | ||
80 | char *name; | |
81 | struct se_hba *hba; | |
82 | ||
83 | #define TCMU_DEV_BIT_OPEN 0 | |
84 | #define TCMU_DEV_BIT_BROKEN 1 | |
85 | unsigned long flags; | |
7c9e7a6f AG |
86 | |
87 | struct uio_info uio_info; | |
88 | ||
89 | struct tcmu_mailbox *mb_addr; | |
90 | size_t dev_size; | |
91 | u32 cmdr_size; | |
92 | u32 cmdr_last_cleaned; | |
93 | /* Offset of data ring from start of mb */ | |
94 | size_t data_off; | |
95 | size_t data_size; | |
96 | /* Ring head + tail values. */ | |
97 | /* Must add data_off and mb_addr to get the address */ | |
98 | size_t data_head; | |
99 | size_t data_tail; | |
100 | ||
101 | wait_queue_head_t wait_cmdr; | |
102 | /* TODO should this be a mutex? */ | |
103 | spinlock_t cmdr_lock; | |
104 | ||
105 | struct idr commands; | |
106 | spinlock_t commands_lock; | |
107 | ||
108 | struct timer_list timeout; | |
109 | ||
110 | char dev_config[TCMU_CONFIG_LEN]; | |
111 | }; | |
112 | ||
113 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
114 | ||
115 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
116 | ||
117 | struct tcmu_cmd { | |
118 | struct se_cmd *se_cmd; | |
119 | struct tcmu_dev *tcmu_dev; | |
120 | ||
121 | uint16_t cmd_id; | |
122 | ||
123 | /* Can't use se_cmd->data_length when cleaning up expired cmds, because if | |
124 | cmd has been completed then accessing se_cmd is off limits */ | |
125 | size_t data_length; | |
126 | ||
127 | unsigned long deadline; | |
128 | ||
129 | #define TCMU_CMD_BIT_EXPIRED 0 | |
130 | unsigned long flags; | |
131 | }; | |
132 | ||
133 | static struct kmem_cache *tcmu_cmd_cache; | |
134 | ||
135 | /* multicast group */ | |
136 | enum tcmu_multicast_groups { | |
137 | TCMU_MCGRP_CONFIG, | |
138 | }; | |
139 | ||
140 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
141 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
142 | }; | |
143 | ||
144 | /* Our generic netlink family */ | |
145 | static struct genl_family tcmu_genl_family = { | |
146 | .id = GENL_ID_GENERATE, | |
147 | .hdrsize = 0, | |
148 | .name = "TCM-USER", | |
149 | .version = 1, | |
150 | .maxattr = TCMU_ATTR_MAX, | |
151 | .mcgrps = tcmu_mcgrps, | |
152 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
153 | }; | |
154 | ||
155 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) | |
156 | { | |
157 | struct se_device *se_dev = se_cmd->se_dev; | |
158 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
159 | struct tcmu_cmd *tcmu_cmd; | |
160 | int cmd_id; | |
161 | ||
162 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
163 | if (!tcmu_cmd) | |
164 | return NULL; | |
165 | ||
166 | tcmu_cmd->se_cmd = se_cmd; | |
167 | tcmu_cmd->tcmu_dev = udev; | |
168 | tcmu_cmd->data_length = se_cmd->data_length; | |
169 | ||
e4648b01 IT |
170 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
171 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
172 | tcmu_cmd->data_length += se_cmd->t_bidi_data_sg->length; | |
173 | } | |
174 | ||
7c9e7a6f AG |
175 | tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); |
176 | ||
177 | idr_preload(GFP_KERNEL); | |
178 | spin_lock_irq(&udev->commands_lock); | |
179 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
180 | USHRT_MAX, GFP_NOWAIT); | |
181 | spin_unlock_irq(&udev->commands_lock); | |
182 | idr_preload_end(); | |
183 | ||
184 | if (cmd_id < 0) { | |
185 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
186 | return NULL; | |
187 | } | |
188 | tcmu_cmd->cmd_id = cmd_id; | |
189 | ||
190 | return tcmu_cmd; | |
191 | } | |
192 | ||
193 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
194 | { | |
195 | unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; | |
196 | ||
197 | size = round_up(size+offset, PAGE_SIZE); | |
198 | vaddr -= offset; | |
199 | ||
200 | while (size) { | |
201 | flush_dcache_page(virt_to_page(vaddr)); | |
202 | size -= PAGE_SIZE; | |
203 | } | |
204 | } | |
205 | ||
206 | /* | |
207 | * Some ring helper functions. We don't assume size is a power of 2 so | |
208 | * we can't use circ_buf.h. | |
209 | */ | |
210 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
211 | { | |
212 | int diff = head - tail; | |
213 | ||
214 | if (diff >= 0) | |
215 | return diff; | |
216 | else | |
217 | return size + diff; | |
218 | } | |
219 | ||
220 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
221 | { | |
222 | /* Keep 1 byte unused or we can't tell full from empty */ | |
223 | return (size - spc_used(head, tail, size) - 1); | |
224 | } | |
225 | ||
226 | static inline size_t head_to_end(size_t head, size_t size) | |
227 | { | |
228 | return size - head; | |
229 | } | |
230 | ||
231 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) | |
232 | ||
f97ec7db IT |
233 | static void alloc_and_scatter_data_area(struct tcmu_dev *udev, |
234 | struct scatterlist *data_sg, unsigned int data_nents, | |
235 | struct iovec **iov, int *iov_cnt, bool copy_data) | |
236 | { | |
237 | int i; | |
238 | void *from, *to; | |
239 | size_t copy_bytes; | |
240 | struct scatterlist *sg; | |
241 | ||
242 | for_each_sg(data_sg, sg, data_nents, i) { | |
243 | copy_bytes = min_t(size_t, sg->length, | |
244 | head_to_end(udev->data_head, udev->data_size)); | |
245 | from = kmap_atomic(sg_page(sg)) + sg->offset; | |
246 | to = (void *) udev->mb_addr + udev->data_off + udev->data_head; | |
247 | ||
248 | if (copy_data) { | |
249 | memcpy(to, from, copy_bytes); | |
250 | tcmu_flush_dcache_range(to, copy_bytes); | |
251 | } | |
252 | ||
253 | /* Even iov_base is relative to mb_addr */ | |
254 | (*iov)->iov_len = copy_bytes; | |
255 | (*iov)->iov_base = (void __user *) udev->data_off + | |
256 | udev->data_head; | |
257 | (*iov_cnt)++; | |
258 | (*iov)++; | |
259 | ||
260 | UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); | |
261 | ||
262 | /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ | |
263 | if (sg->length != copy_bytes) { | |
264 | from += copy_bytes; | |
265 | copy_bytes = sg->length - copy_bytes; | |
266 | ||
267 | (*iov)->iov_len = copy_bytes; | |
268 | (*iov)->iov_base = (void __user *) udev->data_off + | |
269 | udev->data_head; | |
270 | ||
271 | if (copy_data) { | |
272 | to = (void *) udev->mb_addr + | |
273 | udev->data_off + udev->data_head; | |
274 | memcpy(to, from, copy_bytes); | |
275 | tcmu_flush_dcache_range(to, copy_bytes); | |
276 | } | |
277 | ||
278 | (*iov_cnt)++; | |
279 | (*iov)++; | |
280 | ||
281 | UPDATE_HEAD(udev->data_head, | |
282 | copy_bytes, udev->data_size); | |
283 | } | |
284 | ||
285 | kunmap_atomic(from); | |
286 | } | |
287 | } | |
288 | ||
289 | static void gather_and_free_data_area(struct tcmu_dev *udev, | |
290 | struct scatterlist *data_sg, unsigned int data_nents) | |
291 | { | |
292 | int i; | |
293 | void *from, *to; | |
294 | size_t copy_bytes; | |
295 | struct scatterlist *sg; | |
296 | ||
297 | /* It'd be easier to look at entry's iovec again, but UAM */ | |
298 | for_each_sg(data_sg, sg, data_nents, i) { | |
299 | copy_bytes = min_t(size_t, sg->length, | |
300 | head_to_end(udev->data_tail, udev->data_size)); | |
301 | ||
302 | to = kmap_atomic(sg_page(sg)) + sg->offset; | |
303 | WARN_ON(sg->length + sg->offset > PAGE_SIZE); | |
304 | from = (void *) udev->mb_addr + | |
305 | udev->data_off + udev->data_tail; | |
306 | tcmu_flush_dcache_range(from, copy_bytes); | |
307 | memcpy(to, from, copy_bytes); | |
308 | ||
309 | UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); | |
310 | ||
311 | /* Uh oh, wrapped the data buffer for this sg's data */ | |
312 | if (sg->length != copy_bytes) { | |
313 | from = (void *) udev->mb_addr + | |
314 | udev->data_off + udev->data_tail; | |
315 | WARN_ON(udev->data_tail); | |
316 | to += copy_bytes; | |
317 | copy_bytes = sg->length - copy_bytes; | |
318 | tcmu_flush_dcache_range(from, copy_bytes); | |
319 | memcpy(to, from, copy_bytes); | |
320 | ||
321 | UPDATE_HEAD(udev->data_tail, | |
322 | copy_bytes, udev->data_size); | |
323 | } | |
324 | kunmap_atomic(to); | |
325 | } | |
326 | } | |
327 | ||
7c9e7a6f | 328 | /* |
f97ec7db IT |
329 | * We can't queue a command until we have space available on the cmd ring *and* |
330 | * space available on the data ring. | |
7c9e7a6f AG |
331 | * |
332 | * Called with ring lock held. | |
333 | */ | |
f56574a2 | 334 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) |
7c9e7a6f AG |
335 | { |
336 | struct tcmu_mailbox *mb = udev->mb_addr; | |
337 | size_t space; | |
338 | u32 cmd_head; | |
f56574a2 | 339 | size_t cmd_needed; |
7c9e7a6f AG |
340 | |
341 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
342 | ||
343 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
344 | ||
f56574a2 AG |
345 | /* |
346 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
347 | * original cmd - cmds are internally contiguous. | |
348 | */ | |
349 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
350 | cmd_needed = cmd_size; | |
351 | else | |
352 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
353 | ||
7c9e7a6f AG |
354 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
355 | if (space < cmd_needed) { | |
356 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
357 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
358 | return false; | |
359 | } | |
360 | ||
361 | space = spc_free(udev->data_head, udev->data_tail, udev->data_size); | |
362 | if (space < data_needed) { | |
363 | pr_debug("no data space: %zu %zu %zu\n", udev->data_head, | |
364 | udev->data_tail, udev->data_size); | |
365 | return false; | |
366 | } | |
367 | ||
368 | return true; | |
369 | } | |
370 | ||
371 | static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
372 | { | |
373 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
374 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
375 | size_t base_command_size, command_size; | |
7c9e7a6f | 376 | struct tcmu_mailbox *mb; |
7c9e7a6f | 377 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 378 | struct iovec *iov; |
f97ec7db | 379 | int iov_cnt; |
7c9e7a6f AG |
380 | uint32_t cmd_head; |
381 | uint64_t cdb_off; | |
f97ec7db | 382 | bool copy_to_data_area; |
7c9e7a6f AG |
383 | |
384 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
385 | return -EINVAL; | |
386 | ||
387 | /* | |
388 | * Must be a certain minimum size for response sense info, but | |
389 | * also may be larger if the iov array is large. | |
390 | * | |
391 | * iovs = sgl_nents+1, for end-of-ring case, plus another 1 | |
392 | * b/c size == offsetof one-past-element. | |
393 | */ | |
394 | base_command_size = max(offsetof(struct tcmu_cmd_entry, | |
e4648b01 IT |
395 | req.iov[se_cmd->t_bidi_data_nents + |
396 | se_cmd->t_data_nents + 2]), | |
7c9e7a6f AG |
397 | sizeof(struct tcmu_cmd_entry)); |
398 | command_size = base_command_size | |
399 | + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); | |
400 | ||
401 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
402 | ||
403 | spin_lock_irq(&udev->cmdr_lock); | |
404 | ||
405 | mb = udev->mb_addr; | |
406 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
407 | if ((command_size > (udev->cmdr_size / 2)) | |
408 | || tcmu_cmd->data_length > (udev->data_size - 1)) | |
409 | pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " | |
410 | "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, | |
411 | udev->cmdr_size, udev->data_size); | |
412 | ||
f56574a2 | 413 | while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { |
7c9e7a6f AG |
414 | int ret; |
415 | DEFINE_WAIT(__wait); | |
416 | ||
417 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
418 | ||
419 | pr_debug("sleeping for ring space\n"); | |
420 | spin_unlock_irq(&udev->cmdr_lock); | |
421 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
422 | finish_wait(&udev->wait_cmdr, &__wait); | |
423 | if (!ret) { | |
424 | pr_warn("tcmu: command timed out\n"); | |
425 | return -ETIMEDOUT; | |
426 | } | |
427 | ||
428 | spin_lock_irq(&udev->cmdr_lock); | |
429 | ||
430 | /* We dropped cmdr_lock, cmd_head is stale */ | |
431 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
432 | } | |
433 | ||
f56574a2 AG |
434 | /* Insert a PAD if end-of-ring space is too small */ |
435 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
436 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
437 | ||
7c9e7a6f AG |
438 | entry = (void *) mb + CMDR_OFF + cmd_head; |
439 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
440 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
441 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
442 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
443 | entry->hdr.kflags = 0; | |
444 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
445 | |
446 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
447 | ||
448 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
449 | WARN_ON(cmd_head != 0); | |
450 | } | |
451 | ||
452 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
453 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
454 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
455 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
456 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
457 | entry->hdr.kflags = 0; | |
458 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
459 | |
460 | /* | |
461 | * Fix up iovecs, and handle if allocation in data ring wrapped. | |
462 | */ | |
463 | iov = &entry->req.iov[0]; | |
f97ec7db | 464 | iov_cnt = 0; |
e4648b01 IT |
465 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
466 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
f97ec7db IT |
467 | alloc_and_scatter_data_area(udev, se_cmd->t_data_sg, |
468 | se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area); | |
7c9e7a6f | 469 | entry->req.iov_cnt = iov_cnt; |
0ad46af8 | 470 | entry->req.iov_dif_cnt = 0; |
7c9e7a6f | 471 | |
e4648b01 IT |
472 | /* Handle BIDI commands */ |
473 | iov_cnt = 0; | |
474 | alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg, | |
475 | se_cmd->t_bidi_data_nents, &iov, &iov_cnt, false); | |
476 | entry->req.iov_bidi_cnt = iov_cnt; | |
477 | ||
7c9e7a6f AG |
478 | /* All offsets relative to mb_addr, not start of entry! */ |
479 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
480 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
481 | entry->req.cdb_off = cdb_off; | |
482 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
483 | ||
484 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
485 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
486 | ||
487 | spin_unlock_irq(&udev->cmdr_lock); | |
488 | ||
489 | /* TODO: only if FLUSH and FUA? */ | |
490 | uio_event_notify(&udev->uio_info); | |
491 | ||
492 | mod_timer(&udev->timeout, | |
493 | round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int tcmu_queue_cmd(struct se_cmd *se_cmd) | |
499 | { | |
500 | struct se_device *se_dev = se_cmd->se_dev; | |
501 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
502 | struct tcmu_cmd *tcmu_cmd; | |
503 | int ret; | |
504 | ||
505 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
506 | if (!tcmu_cmd) | |
507 | return -ENOMEM; | |
508 | ||
509 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
510 | if (ret < 0) { | |
511 | pr_err("TCMU: Could not queue command\n"); | |
512 | spin_lock_irq(&udev->commands_lock); | |
513 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
514 | spin_unlock_irq(&udev->commands_lock); | |
515 | ||
516 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
517 | } | |
518 | ||
519 | return ret; | |
520 | } | |
521 | ||
522 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
523 | { | |
524 | struct se_cmd *se_cmd = cmd->se_cmd; | |
525 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
526 | ||
527 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
528 | /* cmd has been completed already from timeout, just reclaim data | |
529 | ring space */ | |
530 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
531 | return; | |
532 | } | |
533 | ||
0ad46af8 AG |
534 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
535 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
536 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", | |
537 | cmd->se_cmd); | |
538 | transport_generic_request_failure(cmd->se_cmd, | |
539 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
540 | cmd->se_cmd = NULL; | |
541 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
542 | return; | |
543 | } | |
544 | ||
7c9e7a6f AG |
545 | if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { |
546 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, | |
547 | se_cmd->scsi_sense_length); | |
548 | ||
549 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
e4648b01 IT |
550 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
551 | /* Discard data_out buffer */ | |
552 | UPDATE_HEAD(udev->data_tail, | |
553 | (size_t)se_cmd->t_data_sg->length, udev->data_size); | |
554 | ||
555 | /* Get Data-In buffer */ | |
556 | gather_and_free_data_area(udev, | |
557 | se_cmd->t_bidi_data_sg, se_cmd->t_bidi_data_nents); | |
558 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
f97ec7db IT |
559 | gather_and_free_data_area(udev, |
560 | se_cmd->t_data_sg, se_cmd->t_data_nents); | |
7c9e7a6f AG |
561 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
562 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
2bc396a2 IT |
563 | } else if (se_cmd->data_direction != DMA_NONE) { |
564 | pr_warn("TCMU: data direction was %d!\n", | |
565 | se_cmd->data_direction); | |
7c9e7a6f AG |
566 | } |
567 | ||
568 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
569 | cmd->se_cmd = NULL; | |
570 | ||
571 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
572 | } | |
573 | ||
574 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
575 | { | |
576 | struct tcmu_mailbox *mb; | |
577 | LIST_HEAD(cpl_cmds); | |
578 | unsigned long flags; | |
579 | int handled = 0; | |
580 | ||
581 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
582 | pr_err("ring broken, not handling completions\n"); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | spin_lock_irqsave(&udev->cmdr_lock, flags); | |
587 | ||
588 | mb = udev->mb_addr; | |
589 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
590 | ||
591 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
592 | ||
593 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
594 | struct tcmu_cmd *cmd; | |
595 | ||
596 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
597 | ||
0ad46af8 AG |
598 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
599 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
600 | tcmu_hdr_get_len(entry->hdr.len_op), | |
601 | udev->cmdr_size); | |
7c9e7a6f AG |
602 | continue; |
603 | } | |
0ad46af8 | 604 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
605 | |
606 | spin_lock(&udev->commands_lock); | |
0ad46af8 | 607 | cmd = idr_find(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
608 | if (cmd) |
609 | idr_remove(&udev->commands, cmd->cmd_id); | |
610 | spin_unlock(&udev->commands_lock); | |
611 | ||
612 | if (!cmd) { | |
613 | pr_err("cmd_id not found, ring is broken\n"); | |
614 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
615 | break; | |
616 | } | |
617 | ||
618 | tcmu_handle_completion(cmd, entry); | |
619 | ||
0ad46af8 AG |
620 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
621 | tcmu_hdr_get_len(entry->hdr.len_op), | |
622 | udev->cmdr_size); | |
7c9e7a6f AG |
623 | |
624 | handled++; | |
625 | } | |
626 | ||
627 | if (mb->cmd_tail == mb->cmd_head) | |
628 | del_timer(&udev->timeout); /* no more pending cmds */ | |
629 | ||
630 | spin_unlock_irqrestore(&udev->cmdr_lock, flags); | |
631 | ||
632 | wake_up(&udev->wait_cmdr); | |
633 | ||
634 | return handled; | |
635 | } | |
636 | ||
637 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
638 | { | |
639 | struct tcmu_cmd *cmd = p; | |
640 | ||
641 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
642 | return 0; | |
643 | ||
644 | if (!time_after(cmd->deadline, jiffies)) | |
645 | return 0; | |
646 | ||
647 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
648 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
649 | cmd->se_cmd = NULL; | |
650 | ||
651 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | static void tcmu_device_timedout(unsigned long data) | |
657 | { | |
658 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
659 | unsigned long flags; | |
660 | int handled; | |
661 | ||
662 | handled = tcmu_handle_completions(udev); | |
663 | ||
664 | pr_warn("%d completions handled from timeout\n", handled); | |
665 | ||
666 | spin_lock_irqsave(&udev->commands_lock, flags); | |
667 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
668 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
669 | ||
670 | /* | |
671 | * We don't need to wakeup threads on wait_cmdr since they have their | |
672 | * own timeout. | |
673 | */ | |
674 | } | |
675 | ||
676 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
677 | { | |
678 | struct tcmu_hba *tcmu_hba; | |
679 | ||
680 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
681 | if (!tcmu_hba) | |
682 | return -ENOMEM; | |
683 | ||
684 | tcmu_hba->host_id = host_id; | |
685 | hba->hba_ptr = tcmu_hba; | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | static void tcmu_detach_hba(struct se_hba *hba) | |
691 | { | |
692 | kfree(hba->hba_ptr); | |
693 | hba->hba_ptr = NULL; | |
694 | } | |
695 | ||
696 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
697 | { | |
698 | struct tcmu_dev *udev; | |
699 | ||
700 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
701 | if (!udev) | |
702 | return NULL; | |
703 | ||
704 | udev->name = kstrdup(name, GFP_KERNEL); | |
705 | if (!udev->name) { | |
706 | kfree(udev); | |
707 | return NULL; | |
708 | } | |
709 | ||
710 | udev->hba = hba; | |
711 | ||
712 | init_waitqueue_head(&udev->wait_cmdr); | |
713 | spin_lock_init(&udev->cmdr_lock); | |
714 | ||
715 | idr_init(&udev->commands); | |
716 | spin_lock_init(&udev->commands_lock); | |
717 | ||
718 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
719 | (unsigned long)udev); | |
720 | ||
7c9e7a6f AG |
721 | return &udev->se_dev; |
722 | } | |
723 | ||
724 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
725 | { | |
726 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
727 | ||
728 | tcmu_handle_completions(tcmu_dev); | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
733 | /* | |
734 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
735 | * and this stuff must come along. | |
736 | */ | |
737 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
738 | { | |
739 | struct tcmu_dev *udev = vma->vm_private_data; | |
740 | struct uio_info *info = &udev->uio_info; | |
741 | ||
742 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
743 | if (info->mem[vma->vm_pgoff].size == 0) | |
744 | return -1; | |
745 | return (int)vma->vm_pgoff; | |
746 | } | |
747 | return -1; | |
748 | } | |
749 | ||
750 | static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
751 | { | |
752 | struct tcmu_dev *udev = vma->vm_private_data; | |
753 | struct uio_info *info = &udev->uio_info; | |
754 | struct page *page; | |
755 | unsigned long offset; | |
756 | void *addr; | |
757 | ||
758 | int mi = tcmu_find_mem_index(vma); | |
759 | if (mi < 0) | |
760 | return VM_FAULT_SIGBUS; | |
761 | ||
762 | /* | |
763 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
764 | * to use mem[N]. | |
765 | */ | |
766 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
767 | ||
768 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
769 | if (info->mem[mi].memtype == UIO_MEM_LOGICAL) | |
770 | page = virt_to_page(addr); | |
771 | else | |
772 | page = vmalloc_to_page(addr); | |
773 | get_page(page); | |
774 | vmf->page = page; | |
775 | return 0; | |
776 | } | |
777 | ||
778 | static const struct vm_operations_struct tcmu_vm_ops = { | |
779 | .fault = tcmu_vma_fault, | |
780 | }; | |
781 | ||
782 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
783 | { | |
784 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
785 | ||
786 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
787 | vma->vm_ops = &tcmu_vm_ops; | |
788 | ||
789 | vma->vm_private_data = udev; | |
790 | ||
791 | /* Ensure the mmap is exactly the right size */ | |
792 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
793 | return -EINVAL; | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
798 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
799 | { | |
800 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
801 | ||
802 | /* O_EXCL not supported for char devs, so fake it? */ | |
803 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
804 | return -EBUSY; | |
805 | ||
806 | pr_debug("open\n"); | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
811 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
812 | { | |
813 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
814 | ||
815 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
816 | ||
817 | pr_debug("close\n"); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) | |
823 | { | |
824 | struct sk_buff *skb; | |
825 | void *msg_header; | |
6e14eab9 | 826 | int ret = -ENOMEM; |
7c9e7a6f AG |
827 | |
828 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
829 | if (!skb) | |
6e14eab9 | 830 | return ret; |
7c9e7a6f AG |
831 | |
832 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
833 | if (!msg_header) |
834 | goto free_skb; | |
7c9e7a6f AG |
835 | |
836 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); | |
6e14eab9 NB |
837 | if (ret < 0) |
838 | goto free_skb; | |
7c9e7a6f AG |
839 | |
840 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); | |
6e14eab9 NB |
841 | if (ret < 0) |
842 | goto free_skb; | |
7c9e7a6f | 843 | |
053c095a | 844 | genlmsg_end(skb, msg_header); |
7c9e7a6f AG |
845 | |
846 | ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, | |
847 | TCMU_MCGRP_CONFIG, GFP_KERNEL); | |
848 | ||
849 | /* We don't care if no one is listening */ | |
850 | if (ret == -ESRCH) | |
851 | ret = 0; | |
852 | ||
853 | return ret; | |
6e14eab9 NB |
854 | free_skb: |
855 | nlmsg_free(skb); | |
856 | return ret; | |
7c9e7a6f AG |
857 | } |
858 | ||
859 | static int tcmu_configure_device(struct se_device *dev) | |
860 | { | |
861 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
862 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
863 | struct uio_info *info; | |
864 | struct tcmu_mailbox *mb; | |
865 | size_t size; | |
866 | size_t used; | |
867 | int ret = 0; | |
868 | char *str; | |
869 | ||
870 | info = &udev->uio_info; | |
871 | ||
872 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
873 | udev->dev_config); | |
874 | size += 1; /* for \0 */ | |
875 | str = kmalloc(size, GFP_KERNEL); | |
876 | if (!str) | |
877 | return -ENOMEM; | |
878 | ||
879 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
880 | ||
881 | if (udev->dev_config[0]) | |
882 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
883 | ||
884 | info->name = str; | |
885 | ||
886 | udev->mb_addr = vzalloc(TCMU_RING_SIZE); | |
887 | if (!udev->mb_addr) { | |
888 | ret = -ENOMEM; | |
889 | goto err_vzalloc; | |
890 | } | |
891 | ||
892 | /* mailbox fits in first part of CMDR space */ | |
893 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
894 | udev->data_off = CMDR_SIZE; | |
895 | udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; | |
896 | ||
897 | mb = udev->mb_addr; | |
0ad46af8 | 898 | mb->version = TCMU_MAILBOX_VERSION; |
7c9e7a6f AG |
899 | mb->cmdr_off = CMDR_OFF; |
900 | mb->cmdr_size = udev->cmdr_size; | |
901 | ||
902 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
903 | WARN_ON(udev->data_size % PAGE_SIZE); | |
904 | ||
0ad46af8 | 905 | info->version = xstr(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
906 | |
907 | info->mem[0].name = "tcm-user command & data buffer"; | |
908 | info->mem[0].addr = (phys_addr_t) udev->mb_addr; | |
909 | info->mem[0].size = TCMU_RING_SIZE; | |
910 | info->mem[0].memtype = UIO_MEM_VIRTUAL; | |
911 | ||
912 | info->irqcontrol = tcmu_irqcontrol; | |
913 | info->irq = UIO_IRQ_CUSTOM; | |
914 | ||
915 | info->mmap = tcmu_mmap; | |
916 | info->open = tcmu_open; | |
917 | info->release = tcmu_release; | |
918 | ||
919 | ret = uio_register_device(tcmu_root_device, info); | |
920 | if (ret) | |
921 | goto err_register; | |
922 | ||
923 | /* Other attributes can be configured in userspace */ | |
924 | dev->dev_attrib.hw_block_size = 512; | |
925 | dev->dev_attrib.hw_max_sectors = 128; | |
926 | dev->dev_attrib.hw_queue_depth = 128; | |
927 | ||
928 | ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, | |
929 | udev->uio_info.uio_dev->minor); | |
930 | if (ret) | |
931 | goto err_netlink; | |
932 | ||
933 | return 0; | |
934 | ||
935 | err_netlink: | |
936 | uio_unregister_device(&udev->uio_info); | |
937 | err_register: | |
938 | vfree(udev->mb_addr); | |
939 | err_vzalloc: | |
940 | kfree(info->name); | |
941 | ||
942 | return ret; | |
943 | } | |
944 | ||
945 | static int tcmu_check_pending_cmd(int id, void *p, void *data) | |
946 | { | |
947 | struct tcmu_cmd *cmd = p; | |
948 | ||
949 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
950 | return 0; | |
951 | return -EINVAL; | |
952 | } | |
953 | ||
954 | static void tcmu_free_device(struct se_device *dev) | |
955 | { | |
956 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
957 | int i; | |
958 | ||
959 | del_timer_sync(&udev->timeout); | |
960 | ||
961 | vfree(udev->mb_addr); | |
962 | ||
963 | /* Upper layer should drain all requests before calling this */ | |
964 | spin_lock_irq(&udev->commands_lock); | |
965 | i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); | |
966 | idr_destroy(&udev->commands); | |
967 | spin_unlock_irq(&udev->commands_lock); | |
968 | WARN_ON(i); | |
969 | ||
970 | /* Device was configured */ | |
971 | if (udev->uio_info.uio_dev) { | |
972 | tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, | |
973 | udev->uio_info.uio_dev->minor); | |
974 | ||
975 | uio_unregister_device(&udev->uio_info); | |
976 | kfree(udev->uio_info.name); | |
977 | kfree(udev->name); | |
978 | } | |
979 | ||
980 | kfree(udev); | |
981 | } | |
982 | ||
983 | enum { | |
9c1cd1b6 | 984 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, |
7c9e7a6f AG |
985 | }; |
986 | ||
987 | static match_table_t tokens = { | |
988 | {Opt_dev_config, "dev_config=%s"}, | |
989 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 990 | {Opt_hw_block_size, "hw_block_size=%u"}, |
7c9e7a6f AG |
991 | {Opt_err, NULL} |
992 | }; | |
993 | ||
994 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, | |
995 | const char *page, ssize_t count) | |
996 | { | |
997 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
998 | char *orig, *ptr, *opts, *arg_p; | |
999 | substring_t args[MAX_OPT_ARGS]; | |
1000 | int ret = 0, token; | |
9c1cd1b6 | 1001 | unsigned long tmp_ul; |
7c9e7a6f AG |
1002 | |
1003 | opts = kstrdup(page, GFP_KERNEL); | |
1004 | if (!opts) | |
1005 | return -ENOMEM; | |
1006 | ||
1007 | orig = opts; | |
1008 | ||
1009 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1010 | if (!*ptr) | |
1011 | continue; | |
1012 | ||
1013 | token = match_token(ptr, tokens, args); | |
1014 | switch (token) { | |
1015 | case Opt_dev_config: | |
1016 | if (match_strlcpy(udev->dev_config, &args[0], | |
1017 | TCMU_CONFIG_LEN) == 0) { | |
1018 | ret = -EINVAL; | |
1019 | break; | |
1020 | } | |
1021 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1022 | break; | |
1023 | case Opt_dev_size: | |
1024 | arg_p = match_strdup(&args[0]); | |
1025 | if (!arg_p) { | |
1026 | ret = -ENOMEM; | |
1027 | break; | |
1028 | } | |
1029 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1030 | kfree(arg_p); | |
1031 | if (ret < 0) | |
1032 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1033 | break; | |
9c1cd1b6 AG |
1034 | case Opt_hw_block_size: |
1035 | arg_p = match_strdup(&args[0]); | |
1036 | if (!arg_p) { | |
1037 | ret = -ENOMEM; | |
1038 | break; | |
1039 | } | |
1040 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1041 | kfree(arg_p); | |
1042 | if (ret < 0) { | |
1043 | pr_err("kstrtoul() failed for hw_block_size=\n"); | |
1044 | break; | |
1045 | } | |
1046 | if (!tmp_ul) { | |
1047 | pr_err("hw_block_size must be nonzero\n"); | |
1048 | break; | |
1049 | } | |
1050 | dev->dev_attrib.hw_block_size = tmp_ul; | |
1051 | break; | |
7c9e7a6f AG |
1052 | default: |
1053 | break; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | kfree(orig); | |
1058 | return (!ret) ? count : ret; | |
1059 | } | |
1060 | ||
1061 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1062 | { | |
1063 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1064 | ssize_t bl = 0; | |
1065 | ||
1066 | bl = sprintf(b + bl, "Config: %s ", | |
1067 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
8ee83a74 | 1068 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1069 | |
1070 | return bl; | |
1071 | } | |
1072 | ||
1073 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1074 | { | |
1075 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1076 | ||
1077 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1078 | dev->dev_attrib.block_size); | |
1079 | } | |
1080 | ||
1081 | static sense_reason_t | |
9c1cd1b6 | 1082 | tcmu_pass_op(struct se_cmd *se_cmd) |
7c9e7a6f | 1083 | { |
9c1cd1b6 | 1084 | int ret = tcmu_queue_cmd(se_cmd); |
7c9e7a6f AG |
1085 | |
1086 | if (ret != 0) | |
1087 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1088 | else | |
1089 | return TCM_NO_SENSE; | |
1090 | } | |
1091 | ||
1092 | static sense_reason_t | |
9c1cd1b6 | 1093 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1094 | { |
7bfea53b | 1095 | return passthrough_parse_cdb(cmd, tcmu_pass_op); |
7c9e7a6f AG |
1096 | } |
1097 | ||
9c1cd1b6 AG |
1098 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_pi_prot_type); |
1099 | TB_DEV_ATTR_RO(tcmu, hw_pi_prot_type); | |
1100 | ||
1101 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_block_size); | |
1102 | TB_DEV_ATTR_RO(tcmu, hw_block_size); | |
1103 | ||
1104 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_max_sectors); | |
1105 | TB_DEV_ATTR_RO(tcmu, hw_max_sectors); | |
1106 | ||
1107 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_queue_depth); | |
1108 | TB_DEV_ATTR_RO(tcmu, hw_queue_depth); | |
e9f720d6 NB |
1109 | |
1110 | static struct configfs_attribute *tcmu_backend_dev_attrs[] = { | |
e9f720d6 | 1111 | &tcmu_dev_attrib_hw_pi_prot_type.attr, |
e9f720d6 | 1112 | &tcmu_dev_attrib_hw_block_size.attr, |
e9f720d6 | 1113 | &tcmu_dev_attrib_hw_max_sectors.attr, |
e9f720d6 | 1114 | &tcmu_dev_attrib_hw_queue_depth.attr, |
e9f720d6 NB |
1115 | NULL, |
1116 | }; | |
1117 | ||
7c9e7a6f AG |
1118 | static struct se_subsystem_api tcmu_template = { |
1119 | .name = "user", | |
1120 | .inquiry_prod = "USER", | |
1121 | .inquiry_rev = TCMU_VERSION, | |
1122 | .owner = THIS_MODULE, | |
a3541703 | 1123 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1124 | .attach_hba = tcmu_attach_hba, |
1125 | .detach_hba = tcmu_detach_hba, | |
1126 | .alloc_device = tcmu_alloc_device, | |
1127 | .configure_device = tcmu_configure_device, | |
1128 | .free_device = tcmu_free_device, | |
1129 | .parse_cdb = tcmu_parse_cdb, | |
1130 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1131 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1132 | .get_device_type = sbc_get_device_type, | |
1133 | .get_blocks = tcmu_get_blocks, | |
1134 | }; | |
1135 | ||
1136 | static int __init tcmu_module_init(void) | |
1137 | { | |
e9f720d6 | 1138 | struct target_backend_cits *tbc = &tcmu_template.tb_cits; |
7c9e7a6f AG |
1139 | int ret; |
1140 | ||
1141 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1142 | ||
1143 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1144 | sizeof(struct tcmu_cmd), | |
1145 | __alignof__(struct tcmu_cmd), | |
1146 | 0, NULL); | |
1147 | if (!tcmu_cmd_cache) | |
1148 | return -ENOMEM; | |
1149 | ||
1150 | tcmu_root_device = root_device_register("tcm_user"); | |
1151 | if (IS_ERR(tcmu_root_device)) { | |
1152 | ret = PTR_ERR(tcmu_root_device); | |
1153 | goto out_free_cache; | |
1154 | } | |
1155 | ||
1156 | ret = genl_register_family(&tcmu_genl_family); | |
1157 | if (ret < 0) { | |
1158 | goto out_unreg_device; | |
1159 | } | |
1160 | ||
e9f720d6 NB |
1161 | target_core_setup_sub_cits(&tcmu_template); |
1162 | tbc->tb_dev_attrib_cit.ct_attrs = tcmu_backend_dev_attrs; | |
1163 | ||
7c9e7a6f AG |
1164 | ret = transport_subsystem_register(&tcmu_template); |
1165 | if (ret) | |
1166 | goto out_unreg_genl; | |
1167 | ||
1168 | return 0; | |
1169 | ||
1170 | out_unreg_genl: | |
1171 | genl_unregister_family(&tcmu_genl_family); | |
1172 | out_unreg_device: | |
1173 | root_device_unregister(tcmu_root_device); | |
1174 | out_free_cache: | |
1175 | kmem_cache_destroy(tcmu_cmd_cache); | |
1176 | ||
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | static void __exit tcmu_module_exit(void) | |
1181 | { | |
1182 | transport_subsystem_release(&tcmu_template); | |
1183 | genl_unregister_family(&tcmu_genl_family); | |
1184 | root_device_unregister(tcmu_root_device); | |
1185 | kmem_cache_destroy(tcmu_cmd_cache); | |
1186 | } | |
1187 | ||
1188 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
1189 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
1190 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
1191 | MODULE_LICENSE("GPL"); | |
1192 | ||
1193 | module_init(tcmu_module_init); | |
1194 | module_exit(tcmu_module_exit); |