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7c9e7a6f AG |
1 | /* |
2 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
3 | * Copyright (C) 2014 Red Hat, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #include <linux/spinlock.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/idr.h> | |
ba929992 | 22 | #include <linux/kernel.h> |
7c9e7a6f AG |
23 | #include <linux/timer.h> |
24 | #include <linux/parser.h> | |
5538d294 | 25 | #include <linux/vmalloc.h> |
7c9e7a6f AG |
26 | #include <linux/uio_driver.h> |
27 | #include <net/genetlink.h> | |
ba929992 BVA |
28 | #include <scsi/scsi_common.h> |
29 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
30 | #include <target/target_core_base.h> |
31 | #include <target/target_core_fabric.h> | |
32 | #include <target/target_core_backend.h> | |
e9f720d6 NB |
33 | #include <target/target_core_backend_configfs.h> |
34 | ||
7c9e7a6f AG |
35 | #include <linux/target_core_user.h> |
36 | ||
37 | /* | |
38 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
39 | * data to userspace for processing. This is to allow backends that | |
40 | * are too complex for in-kernel support to be possible. | |
41 | * | |
42 | * It uses the UIO framework to do a lot of the device-creation and | |
43 | * introspection work for us. | |
44 | * | |
45 | * See the .h file for how the ring is laid out. Note that while the | |
46 | * command ring is defined, the particulars of the data area are | |
47 | * not. Offset values in the command entry point to other locations | |
48 | * internal to the mmap()ed area. There is separate space outside the | |
49 | * command ring for data buffers. This leaves maximum flexibility for | |
50 | * moving buffer allocations, or even page flipping or other | |
51 | * allocation techniques, without altering the command ring layout. | |
52 | * | |
53 | * SECURITY: | |
54 | * The user process must be assumed to be malicious. There's no way to | |
55 | * prevent it breaking the command ring protocol if it wants, but in | |
56 | * order to prevent other issues we must only ever read *data* from | |
57 | * the shared memory area, not offsets or sizes. This applies to | |
58 | * command ring entries as well as the mailbox. Extra code needed for | |
59 | * this may have a 'UAM' comment. | |
60 | */ | |
61 | ||
62 | ||
63 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) | |
64 | ||
65 | #define CMDR_SIZE (16 * 4096) | |
66 | #define DATA_SIZE (257 * 4096) | |
67 | ||
68 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) | |
69 | ||
70 | static struct device *tcmu_root_device; | |
71 | ||
72 | struct tcmu_hba { | |
73 | u32 host_id; | |
74 | }; | |
75 | ||
7c9e7a6f AG |
76 | #define TCMU_CONFIG_LEN 256 |
77 | ||
78 | struct tcmu_dev { | |
79 | struct se_device se_dev; | |
80 | ||
81 | char *name; | |
82 | struct se_hba *hba; | |
83 | ||
84 | #define TCMU_DEV_BIT_OPEN 0 | |
85 | #define TCMU_DEV_BIT_BROKEN 1 | |
86 | unsigned long flags; | |
7c9e7a6f AG |
87 | |
88 | struct uio_info uio_info; | |
89 | ||
90 | struct tcmu_mailbox *mb_addr; | |
91 | size_t dev_size; | |
92 | u32 cmdr_size; | |
93 | u32 cmdr_last_cleaned; | |
94 | /* Offset of data ring from start of mb */ | |
95 | size_t data_off; | |
96 | size_t data_size; | |
97 | /* Ring head + tail values. */ | |
98 | /* Must add data_off and mb_addr to get the address */ | |
99 | size_t data_head; | |
100 | size_t data_tail; | |
101 | ||
102 | wait_queue_head_t wait_cmdr; | |
103 | /* TODO should this be a mutex? */ | |
104 | spinlock_t cmdr_lock; | |
105 | ||
106 | struct idr commands; | |
107 | spinlock_t commands_lock; | |
108 | ||
109 | struct timer_list timeout; | |
110 | ||
111 | char dev_config[TCMU_CONFIG_LEN]; | |
112 | }; | |
113 | ||
114 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
115 | ||
116 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
117 | ||
118 | struct tcmu_cmd { | |
119 | struct se_cmd *se_cmd; | |
120 | struct tcmu_dev *tcmu_dev; | |
121 | ||
122 | uint16_t cmd_id; | |
123 | ||
124 | /* Can't use se_cmd->data_length when cleaning up expired cmds, because if | |
125 | cmd has been completed then accessing se_cmd is off limits */ | |
126 | size_t data_length; | |
127 | ||
128 | unsigned long deadline; | |
129 | ||
130 | #define TCMU_CMD_BIT_EXPIRED 0 | |
131 | unsigned long flags; | |
132 | }; | |
133 | ||
134 | static struct kmem_cache *tcmu_cmd_cache; | |
135 | ||
136 | /* multicast group */ | |
137 | enum tcmu_multicast_groups { | |
138 | TCMU_MCGRP_CONFIG, | |
139 | }; | |
140 | ||
141 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
142 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
143 | }; | |
144 | ||
145 | /* Our generic netlink family */ | |
146 | static struct genl_family tcmu_genl_family = { | |
147 | .id = GENL_ID_GENERATE, | |
148 | .hdrsize = 0, | |
149 | .name = "TCM-USER", | |
150 | .version = 1, | |
151 | .maxattr = TCMU_ATTR_MAX, | |
152 | .mcgrps = tcmu_mcgrps, | |
153 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
154 | }; | |
155 | ||
156 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) | |
157 | { | |
158 | struct se_device *se_dev = se_cmd->se_dev; | |
159 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
160 | struct tcmu_cmd *tcmu_cmd; | |
161 | int cmd_id; | |
162 | ||
163 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
164 | if (!tcmu_cmd) | |
165 | return NULL; | |
166 | ||
167 | tcmu_cmd->se_cmd = se_cmd; | |
168 | tcmu_cmd->tcmu_dev = udev; | |
169 | tcmu_cmd->data_length = se_cmd->data_length; | |
170 | ||
171 | tcmu_cmd->deadline = jiffies + msecs_to_jiffies(TCMU_TIME_OUT); | |
172 | ||
173 | idr_preload(GFP_KERNEL); | |
174 | spin_lock_irq(&udev->commands_lock); | |
175 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
176 | USHRT_MAX, GFP_NOWAIT); | |
177 | spin_unlock_irq(&udev->commands_lock); | |
178 | idr_preload_end(); | |
179 | ||
180 | if (cmd_id < 0) { | |
181 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
182 | return NULL; | |
183 | } | |
184 | tcmu_cmd->cmd_id = cmd_id; | |
185 | ||
186 | return tcmu_cmd; | |
187 | } | |
188 | ||
189 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
190 | { | |
191 | unsigned long offset = (unsigned long) vaddr & ~PAGE_MASK; | |
192 | ||
193 | size = round_up(size+offset, PAGE_SIZE); | |
194 | vaddr -= offset; | |
195 | ||
196 | while (size) { | |
197 | flush_dcache_page(virt_to_page(vaddr)); | |
198 | size -= PAGE_SIZE; | |
199 | } | |
200 | } | |
201 | ||
202 | /* | |
203 | * Some ring helper functions. We don't assume size is a power of 2 so | |
204 | * we can't use circ_buf.h. | |
205 | */ | |
206 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
207 | { | |
208 | int diff = head - tail; | |
209 | ||
210 | if (diff >= 0) | |
211 | return diff; | |
212 | else | |
213 | return size + diff; | |
214 | } | |
215 | ||
216 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
217 | { | |
218 | /* Keep 1 byte unused or we can't tell full from empty */ | |
219 | return (size - spc_used(head, tail, size) - 1); | |
220 | } | |
221 | ||
222 | static inline size_t head_to_end(size_t head, size_t size) | |
223 | { | |
224 | return size - head; | |
225 | } | |
226 | ||
227 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) | |
228 | ||
229 | /* | |
230 | * We can't queue a command until we have space available on the cmd ring *and* space | |
231 | * space avail on the data ring. | |
232 | * | |
233 | * Called with ring lock held. | |
234 | */ | |
f56574a2 | 235 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed) |
7c9e7a6f AG |
236 | { |
237 | struct tcmu_mailbox *mb = udev->mb_addr; | |
238 | size_t space; | |
239 | u32 cmd_head; | |
f56574a2 | 240 | size_t cmd_needed; |
7c9e7a6f AG |
241 | |
242 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
243 | ||
244 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
245 | ||
f56574a2 AG |
246 | /* |
247 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
248 | * original cmd - cmds are internally contiguous. | |
249 | */ | |
250 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
251 | cmd_needed = cmd_size; | |
252 | else | |
253 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
254 | ||
7c9e7a6f AG |
255 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
256 | if (space < cmd_needed) { | |
257 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
258 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
259 | return false; | |
260 | } | |
261 | ||
262 | space = spc_free(udev->data_head, udev->data_tail, udev->data_size); | |
263 | if (space < data_needed) { | |
264 | pr_debug("no data space: %zu %zu %zu\n", udev->data_head, | |
265 | udev->data_tail, udev->data_size); | |
266 | return false; | |
267 | } | |
268 | ||
269 | return true; | |
270 | } | |
271 | ||
272 | static int tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
273 | { | |
274 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
275 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
276 | size_t base_command_size, command_size; | |
7c9e7a6f | 277 | struct tcmu_mailbox *mb; |
7c9e7a6f AG |
278 | struct tcmu_cmd_entry *entry; |
279 | int i; | |
280 | struct scatterlist *sg; | |
281 | struct iovec *iov; | |
282 | int iov_cnt = 0; | |
283 | uint32_t cmd_head; | |
284 | uint64_t cdb_off; | |
285 | ||
286 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
287 | return -EINVAL; | |
288 | ||
289 | /* | |
290 | * Must be a certain minimum size for response sense info, but | |
291 | * also may be larger if the iov array is large. | |
292 | * | |
293 | * iovs = sgl_nents+1, for end-of-ring case, plus another 1 | |
294 | * b/c size == offsetof one-past-element. | |
295 | */ | |
296 | base_command_size = max(offsetof(struct tcmu_cmd_entry, | |
297 | req.iov[se_cmd->t_data_nents + 2]), | |
298 | sizeof(struct tcmu_cmd_entry)); | |
299 | command_size = base_command_size | |
300 | + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); | |
301 | ||
302 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
303 | ||
304 | spin_lock_irq(&udev->cmdr_lock); | |
305 | ||
306 | mb = udev->mb_addr; | |
307 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
308 | if ((command_size > (udev->cmdr_size / 2)) | |
309 | || tcmu_cmd->data_length > (udev->data_size - 1)) | |
310 | pr_warn("TCMU: Request of size %zu/%zu may be too big for %u/%zu " | |
311 | "cmd/data ring buffers\n", command_size, tcmu_cmd->data_length, | |
312 | udev->cmdr_size, udev->data_size); | |
313 | ||
f56574a2 | 314 | while (!is_ring_space_avail(udev, command_size, tcmu_cmd->data_length)) { |
7c9e7a6f AG |
315 | int ret; |
316 | DEFINE_WAIT(__wait); | |
317 | ||
318 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
319 | ||
320 | pr_debug("sleeping for ring space\n"); | |
321 | spin_unlock_irq(&udev->cmdr_lock); | |
322 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
323 | finish_wait(&udev->wait_cmdr, &__wait); | |
324 | if (!ret) { | |
325 | pr_warn("tcmu: command timed out\n"); | |
326 | return -ETIMEDOUT; | |
327 | } | |
328 | ||
329 | spin_lock_irq(&udev->cmdr_lock); | |
330 | ||
331 | /* We dropped cmdr_lock, cmd_head is stale */ | |
332 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
333 | } | |
334 | ||
f56574a2 AG |
335 | /* Insert a PAD if end-of-ring space is too small */ |
336 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
337 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
338 | ||
7c9e7a6f AG |
339 | entry = (void *) mb + CMDR_OFF + cmd_head; |
340 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
341 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
342 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
343 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
344 | entry->hdr.kflags = 0; | |
345 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
346 | |
347 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
348 | ||
349 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
350 | WARN_ON(cmd_head != 0); | |
351 | } | |
352 | ||
353 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
354 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
355 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
356 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
357 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
358 | entry->hdr.kflags = 0; | |
359 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
360 | |
361 | /* | |
362 | * Fix up iovecs, and handle if allocation in data ring wrapped. | |
363 | */ | |
364 | iov = &entry->req.iov[0]; | |
365 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { | |
366 | size_t copy_bytes = min((size_t)sg->length, | |
367 | head_to_end(udev->data_head, udev->data_size)); | |
368 | void *from = kmap_atomic(sg_page(sg)) + sg->offset; | |
369 | void *to = (void *) mb + udev->data_off + udev->data_head; | |
370 | ||
371 | if (tcmu_cmd->se_cmd->data_direction == DMA_TO_DEVICE) { | |
372 | memcpy(to, from, copy_bytes); | |
373 | tcmu_flush_dcache_range(to, copy_bytes); | |
374 | } | |
375 | ||
376 | /* Even iov_base is relative to mb_addr */ | |
377 | iov->iov_len = copy_bytes; | |
b3c95172 CH |
378 | iov->iov_base = (void __user *) udev->data_off + |
379 | udev->data_head; | |
7c9e7a6f AG |
380 | iov_cnt++; |
381 | iov++; | |
382 | ||
383 | UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); | |
384 | ||
385 | /* Uh oh, we wrapped the buffer. Must split sg across 2 iovs. */ | |
386 | if (sg->length != copy_bytes) { | |
387 | from += copy_bytes; | |
388 | copy_bytes = sg->length - copy_bytes; | |
389 | ||
390 | iov->iov_len = copy_bytes; | |
b3c95172 CH |
391 | iov->iov_base = (void __user *) udev->data_off + |
392 | udev->data_head; | |
7c9e7a6f AG |
393 | |
394 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
395 | to = (void *) mb + udev->data_off + udev->data_head; | |
396 | memcpy(to, from, copy_bytes); | |
397 | tcmu_flush_dcache_range(to, copy_bytes); | |
398 | } | |
399 | ||
400 | iov_cnt++; | |
401 | iov++; | |
402 | ||
403 | UPDATE_HEAD(udev->data_head, copy_bytes, udev->data_size); | |
404 | } | |
405 | ||
406 | kunmap_atomic(from); | |
407 | } | |
408 | entry->req.iov_cnt = iov_cnt; | |
0ad46af8 AG |
409 | entry->req.iov_bidi_cnt = 0; |
410 | entry->req.iov_dif_cnt = 0; | |
7c9e7a6f AG |
411 | |
412 | /* All offsets relative to mb_addr, not start of entry! */ | |
413 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
414 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
415 | entry->req.cdb_off = cdb_off; | |
416 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
417 | ||
418 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
419 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
420 | ||
421 | spin_unlock_irq(&udev->cmdr_lock); | |
422 | ||
423 | /* TODO: only if FLUSH and FUA? */ | |
424 | uio_event_notify(&udev->uio_info); | |
425 | ||
426 | mod_timer(&udev->timeout, | |
427 | round_jiffies_up(jiffies + msecs_to_jiffies(TCMU_TIME_OUT))); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | static int tcmu_queue_cmd(struct se_cmd *se_cmd) | |
433 | { | |
434 | struct se_device *se_dev = se_cmd->se_dev; | |
435 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
436 | struct tcmu_cmd *tcmu_cmd; | |
437 | int ret; | |
438 | ||
439 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
440 | if (!tcmu_cmd) | |
441 | return -ENOMEM; | |
442 | ||
443 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
444 | if (ret < 0) { | |
445 | pr_err("TCMU: Could not queue command\n"); | |
446 | spin_lock_irq(&udev->commands_lock); | |
447 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
448 | spin_unlock_irq(&udev->commands_lock); | |
449 | ||
450 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
451 | } | |
452 | ||
453 | return ret; | |
454 | } | |
455 | ||
456 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
457 | { | |
458 | struct se_cmd *se_cmd = cmd->se_cmd; | |
459 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
460 | ||
461 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
462 | /* cmd has been completed already from timeout, just reclaim data | |
463 | ring space */ | |
464 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
465 | return; | |
466 | } | |
467 | ||
0ad46af8 AG |
468 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
469 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
470 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", | |
471 | cmd->se_cmd); | |
472 | transport_generic_request_failure(cmd->se_cmd, | |
473 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
474 | cmd->se_cmd = NULL; | |
475 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
476 | return; | |
477 | } | |
478 | ||
7c9e7a6f AG |
479 | if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { |
480 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, | |
481 | se_cmd->scsi_sense_length); | |
482 | ||
483 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
484 | } | |
485 | else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
486 | struct scatterlist *sg; | |
487 | int i; | |
488 | ||
489 | /* It'd be easier to look at entry's iovec again, but UAM */ | |
490 | for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, i) { | |
491 | size_t copy_bytes; | |
492 | void *to; | |
493 | void *from; | |
494 | ||
495 | copy_bytes = min((size_t)sg->length, | |
496 | head_to_end(udev->data_tail, udev->data_size)); | |
497 | ||
498 | to = kmap_atomic(sg_page(sg)) + sg->offset; | |
499 | WARN_ON(sg->length + sg->offset > PAGE_SIZE); | |
500 | from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; | |
501 | tcmu_flush_dcache_range(from, copy_bytes); | |
502 | memcpy(to, from, copy_bytes); | |
503 | ||
504 | UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); | |
505 | ||
506 | /* Uh oh, wrapped the data buffer for this sg's data */ | |
507 | if (sg->length != copy_bytes) { | |
508 | from = (void *) udev->mb_addr + udev->data_off + udev->data_tail; | |
509 | WARN_ON(udev->data_tail); | |
510 | to += copy_bytes; | |
511 | copy_bytes = sg->length - copy_bytes; | |
512 | tcmu_flush_dcache_range(from, copy_bytes); | |
513 | memcpy(to, from, copy_bytes); | |
514 | ||
515 | UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size); | |
516 | } | |
517 | ||
518 | kunmap_atomic(to); | |
519 | } | |
520 | ||
521 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
522 | UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size); | |
523 | } else { | |
524 | pr_warn("TCMU: data direction was %d!\n", se_cmd->data_direction); | |
525 | } | |
526 | ||
527 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
528 | cmd->se_cmd = NULL; | |
529 | ||
530 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
531 | } | |
532 | ||
533 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
534 | { | |
535 | struct tcmu_mailbox *mb; | |
536 | LIST_HEAD(cpl_cmds); | |
537 | unsigned long flags; | |
538 | int handled = 0; | |
539 | ||
540 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
541 | pr_err("ring broken, not handling completions\n"); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | spin_lock_irqsave(&udev->cmdr_lock, flags); | |
546 | ||
547 | mb = udev->mb_addr; | |
548 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
549 | ||
550 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
551 | ||
552 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
553 | struct tcmu_cmd *cmd; | |
554 | ||
555 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
556 | ||
0ad46af8 AG |
557 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
558 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
559 | tcmu_hdr_get_len(entry->hdr.len_op), | |
560 | udev->cmdr_size); | |
7c9e7a6f AG |
561 | continue; |
562 | } | |
0ad46af8 | 563 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
564 | |
565 | spin_lock(&udev->commands_lock); | |
0ad46af8 | 566 | cmd = idr_find(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
567 | if (cmd) |
568 | idr_remove(&udev->commands, cmd->cmd_id); | |
569 | spin_unlock(&udev->commands_lock); | |
570 | ||
571 | if (!cmd) { | |
572 | pr_err("cmd_id not found, ring is broken\n"); | |
573 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
574 | break; | |
575 | } | |
576 | ||
577 | tcmu_handle_completion(cmd, entry); | |
578 | ||
0ad46af8 AG |
579 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
580 | tcmu_hdr_get_len(entry->hdr.len_op), | |
581 | udev->cmdr_size); | |
7c9e7a6f AG |
582 | |
583 | handled++; | |
584 | } | |
585 | ||
586 | if (mb->cmd_tail == mb->cmd_head) | |
587 | del_timer(&udev->timeout); /* no more pending cmds */ | |
588 | ||
589 | spin_unlock_irqrestore(&udev->cmdr_lock, flags); | |
590 | ||
591 | wake_up(&udev->wait_cmdr); | |
592 | ||
593 | return handled; | |
594 | } | |
595 | ||
596 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
597 | { | |
598 | struct tcmu_cmd *cmd = p; | |
599 | ||
600 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
601 | return 0; | |
602 | ||
603 | if (!time_after(cmd->deadline, jiffies)) | |
604 | return 0; | |
605 | ||
606 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
607 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
608 | cmd->se_cmd = NULL; | |
609 | ||
610 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static void tcmu_device_timedout(unsigned long data) | |
616 | { | |
617 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
618 | unsigned long flags; | |
619 | int handled; | |
620 | ||
621 | handled = tcmu_handle_completions(udev); | |
622 | ||
623 | pr_warn("%d completions handled from timeout\n", handled); | |
624 | ||
625 | spin_lock_irqsave(&udev->commands_lock, flags); | |
626 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
627 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
628 | ||
629 | /* | |
630 | * We don't need to wakeup threads on wait_cmdr since they have their | |
631 | * own timeout. | |
632 | */ | |
633 | } | |
634 | ||
635 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
636 | { | |
637 | struct tcmu_hba *tcmu_hba; | |
638 | ||
639 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
640 | if (!tcmu_hba) | |
641 | return -ENOMEM; | |
642 | ||
643 | tcmu_hba->host_id = host_id; | |
644 | hba->hba_ptr = tcmu_hba; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | static void tcmu_detach_hba(struct se_hba *hba) | |
650 | { | |
651 | kfree(hba->hba_ptr); | |
652 | hba->hba_ptr = NULL; | |
653 | } | |
654 | ||
655 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
656 | { | |
657 | struct tcmu_dev *udev; | |
658 | ||
659 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
660 | if (!udev) | |
661 | return NULL; | |
662 | ||
663 | udev->name = kstrdup(name, GFP_KERNEL); | |
664 | if (!udev->name) { | |
665 | kfree(udev); | |
666 | return NULL; | |
667 | } | |
668 | ||
669 | udev->hba = hba; | |
670 | ||
671 | init_waitqueue_head(&udev->wait_cmdr); | |
672 | spin_lock_init(&udev->cmdr_lock); | |
673 | ||
674 | idr_init(&udev->commands); | |
675 | spin_lock_init(&udev->commands_lock); | |
676 | ||
677 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
678 | (unsigned long)udev); | |
679 | ||
7c9e7a6f AG |
680 | return &udev->se_dev; |
681 | } | |
682 | ||
683 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
684 | { | |
685 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
686 | ||
687 | tcmu_handle_completions(tcmu_dev); | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | /* | |
693 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
694 | * and this stuff must come along. | |
695 | */ | |
696 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
697 | { | |
698 | struct tcmu_dev *udev = vma->vm_private_data; | |
699 | struct uio_info *info = &udev->uio_info; | |
700 | ||
701 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
702 | if (info->mem[vma->vm_pgoff].size == 0) | |
703 | return -1; | |
704 | return (int)vma->vm_pgoff; | |
705 | } | |
706 | return -1; | |
707 | } | |
708 | ||
709 | static int tcmu_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
710 | { | |
711 | struct tcmu_dev *udev = vma->vm_private_data; | |
712 | struct uio_info *info = &udev->uio_info; | |
713 | struct page *page; | |
714 | unsigned long offset; | |
715 | void *addr; | |
716 | ||
717 | int mi = tcmu_find_mem_index(vma); | |
718 | if (mi < 0) | |
719 | return VM_FAULT_SIGBUS; | |
720 | ||
721 | /* | |
722 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
723 | * to use mem[N]. | |
724 | */ | |
725 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
726 | ||
727 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
728 | if (info->mem[mi].memtype == UIO_MEM_LOGICAL) | |
729 | page = virt_to_page(addr); | |
730 | else | |
731 | page = vmalloc_to_page(addr); | |
732 | get_page(page); | |
733 | vmf->page = page; | |
734 | return 0; | |
735 | } | |
736 | ||
737 | static const struct vm_operations_struct tcmu_vm_ops = { | |
738 | .fault = tcmu_vma_fault, | |
739 | }; | |
740 | ||
741 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
742 | { | |
743 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
744 | ||
745 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
746 | vma->vm_ops = &tcmu_vm_ops; | |
747 | ||
748 | vma->vm_private_data = udev; | |
749 | ||
750 | /* Ensure the mmap is exactly the right size */ | |
751 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
752 | return -EINVAL; | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
758 | { | |
759 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
760 | ||
761 | /* O_EXCL not supported for char devs, so fake it? */ | |
762 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
763 | return -EBUSY; | |
764 | ||
765 | pr_debug("open\n"); | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
770 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
771 | { | |
772 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
773 | ||
774 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
775 | ||
776 | pr_debug("close\n"); | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | static int tcmu_netlink_event(enum tcmu_genl_cmd cmd, const char *name, int minor) | |
782 | { | |
783 | struct sk_buff *skb; | |
784 | void *msg_header; | |
6e14eab9 | 785 | int ret = -ENOMEM; |
7c9e7a6f AG |
786 | |
787 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
788 | if (!skb) | |
6e14eab9 | 789 | return ret; |
7c9e7a6f AG |
790 | |
791 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
792 | if (!msg_header) |
793 | goto free_skb; | |
7c9e7a6f AG |
794 | |
795 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, name); | |
6e14eab9 NB |
796 | if (ret < 0) |
797 | goto free_skb; | |
7c9e7a6f AG |
798 | |
799 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, minor); | |
6e14eab9 NB |
800 | if (ret < 0) |
801 | goto free_skb; | |
7c9e7a6f | 802 | |
053c095a | 803 | genlmsg_end(skb, msg_header); |
7c9e7a6f AG |
804 | |
805 | ret = genlmsg_multicast(&tcmu_genl_family, skb, 0, | |
806 | TCMU_MCGRP_CONFIG, GFP_KERNEL); | |
807 | ||
808 | /* We don't care if no one is listening */ | |
809 | if (ret == -ESRCH) | |
810 | ret = 0; | |
811 | ||
812 | return ret; | |
6e14eab9 NB |
813 | free_skb: |
814 | nlmsg_free(skb); | |
815 | return ret; | |
7c9e7a6f AG |
816 | } |
817 | ||
818 | static int tcmu_configure_device(struct se_device *dev) | |
819 | { | |
820 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
821 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
822 | struct uio_info *info; | |
823 | struct tcmu_mailbox *mb; | |
824 | size_t size; | |
825 | size_t used; | |
826 | int ret = 0; | |
827 | char *str; | |
828 | ||
829 | info = &udev->uio_info; | |
830 | ||
831 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
832 | udev->dev_config); | |
833 | size += 1; /* for \0 */ | |
834 | str = kmalloc(size, GFP_KERNEL); | |
835 | if (!str) | |
836 | return -ENOMEM; | |
837 | ||
838 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
839 | ||
840 | if (udev->dev_config[0]) | |
841 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
842 | ||
843 | info->name = str; | |
844 | ||
845 | udev->mb_addr = vzalloc(TCMU_RING_SIZE); | |
846 | if (!udev->mb_addr) { | |
847 | ret = -ENOMEM; | |
848 | goto err_vzalloc; | |
849 | } | |
850 | ||
851 | /* mailbox fits in first part of CMDR space */ | |
852 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
853 | udev->data_off = CMDR_SIZE; | |
854 | udev->data_size = TCMU_RING_SIZE - CMDR_SIZE; | |
855 | ||
856 | mb = udev->mb_addr; | |
0ad46af8 | 857 | mb->version = TCMU_MAILBOX_VERSION; |
7c9e7a6f AG |
858 | mb->cmdr_off = CMDR_OFF; |
859 | mb->cmdr_size = udev->cmdr_size; | |
860 | ||
861 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
862 | WARN_ON(udev->data_size % PAGE_SIZE); | |
863 | ||
0ad46af8 | 864 | info->version = xstr(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
865 | |
866 | info->mem[0].name = "tcm-user command & data buffer"; | |
867 | info->mem[0].addr = (phys_addr_t) udev->mb_addr; | |
868 | info->mem[0].size = TCMU_RING_SIZE; | |
869 | info->mem[0].memtype = UIO_MEM_VIRTUAL; | |
870 | ||
871 | info->irqcontrol = tcmu_irqcontrol; | |
872 | info->irq = UIO_IRQ_CUSTOM; | |
873 | ||
874 | info->mmap = tcmu_mmap; | |
875 | info->open = tcmu_open; | |
876 | info->release = tcmu_release; | |
877 | ||
878 | ret = uio_register_device(tcmu_root_device, info); | |
879 | if (ret) | |
880 | goto err_register; | |
881 | ||
882 | /* Other attributes can be configured in userspace */ | |
883 | dev->dev_attrib.hw_block_size = 512; | |
884 | dev->dev_attrib.hw_max_sectors = 128; | |
885 | dev->dev_attrib.hw_queue_depth = 128; | |
886 | ||
887 | ret = tcmu_netlink_event(TCMU_CMD_ADDED_DEVICE, udev->uio_info.name, | |
888 | udev->uio_info.uio_dev->minor); | |
889 | if (ret) | |
890 | goto err_netlink; | |
891 | ||
892 | return 0; | |
893 | ||
894 | err_netlink: | |
895 | uio_unregister_device(&udev->uio_info); | |
896 | err_register: | |
897 | vfree(udev->mb_addr); | |
898 | err_vzalloc: | |
899 | kfree(info->name); | |
900 | ||
901 | return ret; | |
902 | } | |
903 | ||
904 | static int tcmu_check_pending_cmd(int id, void *p, void *data) | |
905 | { | |
906 | struct tcmu_cmd *cmd = p; | |
907 | ||
908 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
909 | return 0; | |
910 | return -EINVAL; | |
911 | } | |
912 | ||
913 | static void tcmu_free_device(struct se_device *dev) | |
914 | { | |
915 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
916 | int i; | |
917 | ||
918 | del_timer_sync(&udev->timeout); | |
919 | ||
920 | vfree(udev->mb_addr); | |
921 | ||
922 | /* Upper layer should drain all requests before calling this */ | |
923 | spin_lock_irq(&udev->commands_lock); | |
924 | i = idr_for_each(&udev->commands, tcmu_check_pending_cmd, NULL); | |
925 | idr_destroy(&udev->commands); | |
926 | spin_unlock_irq(&udev->commands_lock); | |
927 | WARN_ON(i); | |
928 | ||
929 | /* Device was configured */ | |
930 | if (udev->uio_info.uio_dev) { | |
931 | tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name, | |
932 | udev->uio_info.uio_dev->minor); | |
933 | ||
934 | uio_unregister_device(&udev->uio_info); | |
935 | kfree(udev->uio_info.name); | |
936 | kfree(udev->name); | |
937 | } | |
938 | ||
939 | kfree(udev); | |
940 | } | |
941 | ||
942 | enum { | |
9c1cd1b6 | 943 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err, |
7c9e7a6f AG |
944 | }; |
945 | ||
946 | static match_table_t tokens = { | |
947 | {Opt_dev_config, "dev_config=%s"}, | |
948 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 949 | {Opt_hw_block_size, "hw_block_size=%u"}, |
7c9e7a6f AG |
950 | {Opt_err, NULL} |
951 | }; | |
952 | ||
953 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, | |
954 | const char *page, ssize_t count) | |
955 | { | |
956 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
957 | char *orig, *ptr, *opts, *arg_p; | |
958 | substring_t args[MAX_OPT_ARGS]; | |
959 | int ret = 0, token; | |
9c1cd1b6 | 960 | unsigned long tmp_ul; |
7c9e7a6f AG |
961 | |
962 | opts = kstrdup(page, GFP_KERNEL); | |
963 | if (!opts) | |
964 | return -ENOMEM; | |
965 | ||
966 | orig = opts; | |
967 | ||
968 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
969 | if (!*ptr) | |
970 | continue; | |
971 | ||
972 | token = match_token(ptr, tokens, args); | |
973 | switch (token) { | |
974 | case Opt_dev_config: | |
975 | if (match_strlcpy(udev->dev_config, &args[0], | |
976 | TCMU_CONFIG_LEN) == 0) { | |
977 | ret = -EINVAL; | |
978 | break; | |
979 | } | |
980 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
981 | break; | |
982 | case Opt_dev_size: | |
983 | arg_p = match_strdup(&args[0]); | |
984 | if (!arg_p) { | |
985 | ret = -ENOMEM; | |
986 | break; | |
987 | } | |
988 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
989 | kfree(arg_p); | |
990 | if (ret < 0) | |
991 | pr_err("kstrtoul() failed for dev_size=\n"); | |
992 | break; | |
9c1cd1b6 AG |
993 | case Opt_hw_block_size: |
994 | arg_p = match_strdup(&args[0]); | |
995 | if (!arg_p) { | |
996 | ret = -ENOMEM; | |
997 | break; | |
998 | } | |
999 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1000 | kfree(arg_p); | |
1001 | if (ret < 0) { | |
1002 | pr_err("kstrtoul() failed for hw_block_size=\n"); | |
1003 | break; | |
1004 | } | |
1005 | if (!tmp_ul) { | |
1006 | pr_err("hw_block_size must be nonzero\n"); | |
1007 | break; | |
1008 | } | |
1009 | dev->dev_attrib.hw_block_size = tmp_ul; | |
1010 | break; | |
7c9e7a6f AG |
1011 | default: |
1012 | break; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | kfree(orig); | |
1017 | return (!ret) ? count : ret; | |
1018 | } | |
1019 | ||
1020 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1021 | { | |
1022 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1023 | ssize_t bl = 0; | |
1024 | ||
1025 | bl = sprintf(b + bl, "Config: %s ", | |
1026 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
8ee83a74 | 1027 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1028 | |
1029 | return bl; | |
1030 | } | |
1031 | ||
1032 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1033 | { | |
1034 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1035 | ||
1036 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1037 | dev->dev_attrib.block_size); | |
1038 | } | |
1039 | ||
1040 | static sense_reason_t | |
9c1cd1b6 | 1041 | tcmu_pass_op(struct se_cmd *se_cmd) |
7c9e7a6f | 1042 | { |
9c1cd1b6 | 1043 | int ret = tcmu_queue_cmd(se_cmd); |
7c9e7a6f AG |
1044 | |
1045 | if (ret != 0) | |
1046 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1047 | else | |
1048 | return TCM_NO_SENSE; | |
1049 | } | |
1050 | ||
1051 | static sense_reason_t | |
9c1cd1b6 | 1052 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1053 | { |
7bfea53b | 1054 | return passthrough_parse_cdb(cmd, tcmu_pass_op); |
7c9e7a6f AG |
1055 | } |
1056 | ||
9c1cd1b6 AG |
1057 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_pi_prot_type); |
1058 | TB_DEV_ATTR_RO(tcmu, hw_pi_prot_type); | |
1059 | ||
1060 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_block_size); | |
1061 | TB_DEV_ATTR_RO(tcmu, hw_block_size); | |
1062 | ||
1063 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_max_sectors); | |
1064 | TB_DEV_ATTR_RO(tcmu, hw_max_sectors); | |
1065 | ||
1066 | DEF_TB_DEV_ATTRIB_RO(tcmu, hw_queue_depth); | |
1067 | TB_DEV_ATTR_RO(tcmu, hw_queue_depth); | |
e9f720d6 NB |
1068 | |
1069 | static struct configfs_attribute *tcmu_backend_dev_attrs[] = { | |
e9f720d6 | 1070 | &tcmu_dev_attrib_hw_pi_prot_type.attr, |
e9f720d6 | 1071 | &tcmu_dev_attrib_hw_block_size.attr, |
e9f720d6 | 1072 | &tcmu_dev_attrib_hw_max_sectors.attr, |
e9f720d6 | 1073 | &tcmu_dev_attrib_hw_queue_depth.attr, |
e9f720d6 NB |
1074 | NULL, |
1075 | }; | |
1076 | ||
7c9e7a6f AG |
1077 | static struct se_subsystem_api tcmu_template = { |
1078 | .name = "user", | |
1079 | .inquiry_prod = "USER", | |
1080 | .inquiry_rev = TCMU_VERSION, | |
1081 | .owner = THIS_MODULE, | |
a3541703 | 1082 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1083 | .attach_hba = tcmu_attach_hba, |
1084 | .detach_hba = tcmu_detach_hba, | |
1085 | .alloc_device = tcmu_alloc_device, | |
1086 | .configure_device = tcmu_configure_device, | |
1087 | .free_device = tcmu_free_device, | |
1088 | .parse_cdb = tcmu_parse_cdb, | |
1089 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1090 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1091 | .get_device_type = sbc_get_device_type, | |
1092 | .get_blocks = tcmu_get_blocks, | |
1093 | }; | |
1094 | ||
1095 | static int __init tcmu_module_init(void) | |
1096 | { | |
e9f720d6 | 1097 | struct target_backend_cits *tbc = &tcmu_template.tb_cits; |
7c9e7a6f AG |
1098 | int ret; |
1099 | ||
1100 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1101 | ||
1102 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1103 | sizeof(struct tcmu_cmd), | |
1104 | __alignof__(struct tcmu_cmd), | |
1105 | 0, NULL); | |
1106 | if (!tcmu_cmd_cache) | |
1107 | return -ENOMEM; | |
1108 | ||
1109 | tcmu_root_device = root_device_register("tcm_user"); | |
1110 | if (IS_ERR(tcmu_root_device)) { | |
1111 | ret = PTR_ERR(tcmu_root_device); | |
1112 | goto out_free_cache; | |
1113 | } | |
1114 | ||
1115 | ret = genl_register_family(&tcmu_genl_family); | |
1116 | if (ret < 0) { | |
1117 | goto out_unreg_device; | |
1118 | } | |
1119 | ||
e9f720d6 NB |
1120 | target_core_setup_sub_cits(&tcmu_template); |
1121 | tbc->tb_dev_attrib_cit.ct_attrs = tcmu_backend_dev_attrs; | |
1122 | ||
7c9e7a6f AG |
1123 | ret = transport_subsystem_register(&tcmu_template); |
1124 | if (ret) | |
1125 | goto out_unreg_genl; | |
1126 | ||
1127 | return 0; | |
1128 | ||
1129 | out_unreg_genl: | |
1130 | genl_unregister_family(&tcmu_genl_family); | |
1131 | out_unreg_device: | |
1132 | root_device_unregister(tcmu_root_device); | |
1133 | out_free_cache: | |
1134 | kmem_cache_destroy(tcmu_cmd_cache); | |
1135 | ||
1136 | return ret; | |
1137 | } | |
1138 | ||
1139 | static void __exit tcmu_module_exit(void) | |
1140 | { | |
1141 | transport_subsystem_release(&tcmu_template); | |
1142 | genl_unregister_family(&tcmu_genl_family); | |
1143 | root_device_unregister(tcmu_root_device); | |
1144 | kmem_cache_destroy(tcmu_cmd_cache); | |
1145 | } | |
1146 | ||
1147 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
1148 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
1149 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
1150 | MODULE_LICENSE("GPL"); | |
1151 | ||
1152 | module_init(tcmu_module_init); | |
1153 | module_exit(tcmu_module_exit); |