]>
Commit | Line | Data |
---|---|---|
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> |
b6df4b79 XL |
34 | #include <linux/mutex.h> |
35 | #include <linux/kthread.h> | |
7c9e7a6f | 36 | #include <net/genetlink.h> |
ba929992 BVA |
37 | #include <scsi/scsi_common.h> |
38 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
39 | #include <target/target_core_base.h> |
40 | #include <target/target_core_fabric.h> | |
41 | #include <target/target_core_backend.h> | |
e9f720d6 | 42 | |
7c9e7a6f AG |
43 | #include <linux/target_core_user.h> |
44 | ||
45 | /* | |
46 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
47 | * data to userspace for processing. This is to allow backends that | |
48 | * are too complex for in-kernel support to be possible. | |
49 | * | |
50 | * It uses the UIO framework to do a lot of the device-creation and | |
51 | * introspection work for us. | |
52 | * | |
53 | * See the .h file for how the ring is laid out. Note that while the | |
54 | * command ring is defined, the particulars of the data area are | |
55 | * not. Offset values in the command entry point to other locations | |
56 | * internal to the mmap()ed area. There is separate space outside the | |
57 | * command ring for data buffers. This leaves maximum flexibility for | |
58 | * moving buffer allocations, or even page flipping or other | |
59 | * allocation techniques, without altering the command ring layout. | |
60 | * | |
61 | * SECURITY: | |
62 | * The user process must be assumed to be malicious. There's no way to | |
63 | * prevent it breaking the command ring protocol if it wants, but in | |
64 | * order to prevent other issues we must only ever read *data* from | |
65 | * the shared memory area, not offsets or sizes. This applies to | |
66 | * command ring entries as well as the mailbox. Extra code needed for | |
67 | * this may have a 'UAM' comment. | |
68 | */ | |
69 | ||
7c9e7a6f AG |
70 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
71 | ||
b6df4b79 XL |
72 | /* For cmd area, the size is fixed 8MB */ |
73 | #define CMDR_SIZE (8 * 1024 * 1024) | |
26418649 | 74 | |
b6df4b79 XL |
75 | /* |
76 | * For data area, the block size is PAGE_SIZE and | |
77 | * the total size is 256K * PAGE_SIZE. | |
78 | */ | |
79 | #define DATA_BLOCK_SIZE PAGE_SIZE | |
80 | #define DATA_BLOCK_BITS (256 * 1024) | |
26418649 | 81 | #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) |
b6df4b79 | 82 | #define DATA_BLOCK_INIT_BITS 128 |
7c9e7a6f | 83 | |
b6df4b79 | 84 | /* The total size of the ring is 8M + 256K * PAGE_SIZE */ |
7c9e7a6f AG |
85 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) |
86 | ||
b6df4b79 XL |
87 | /* Default maximum of the global data blocks(512K * PAGE_SIZE) */ |
88 | #define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024) | |
89 | ||
b3af66e2 MC |
90 | static u8 tcmu_kern_cmd_reply_supported; |
91 | ||
7c9e7a6f AG |
92 | static struct device *tcmu_root_device; |
93 | ||
94 | struct tcmu_hba { | |
95 | u32 host_id; | |
96 | }; | |
97 | ||
7c9e7a6f AG |
98 | #define TCMU_CONFIG_LEN 256 |
99 | ||
b3af66e2 MC |
100 | struct tcmu_nl_cmd { |
101 | /* wake up thread waiting for reply */ | |
102 | struct completion complete; | |
103 | int cmd; | |
104 | int status; | |
105 | }; | |
106 | ||
7c9e7a6f | 107 | struct tcmu_dev { |
b6df4b79 | 108 | struct list_head node; |
f3cdbe39 | 109 | struct kref kref; |
7c9e7a6f AG |
110 | struct se_device se_dev; |
111 | ||
112 | char *name; | |
113 | struct se_hba *hba; | |
114 | ||
115 | #define TCMU_DEV_BIT_OPEN 0 | |
116 | #define TCMU_DEV_BIT_BROKEN 1 | |
117 | unsigned long flags; | |
7c9e7a6f AG |
118 | |
119 | struct uio_info uio_info; | |
120 | ||
b6df4b79 XL |
121 | struct inode *inode; |
122 | ||
7c9e7a6f AG |
123 | struct tcmu_mailbox *mb_addr; |
124 | size_t dev_size; | |
125 | u32 cmdr_size; | |
126 | u32 cmdr_last_cleaned; | |
3d9b9555 | 127 | /* Offset of data area from start of mb */ |
26418649 | 128 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f AG |
129 | size_t data_off; |
130 | size_t data_size; | |
26418649 | 131 | |
7c9e7a6f | 132 | wait_queue_head_t wait_cmdr; |
b6df4b79 | 133 | struct mutex cmdr_lock; |
7c9e7a6f | 134 | |
b6df4b79 | 135 | bool waiting_global; |
141685a3 | 136 | uint32_t dbi_max; |
b6df4b79 | 137 | uint32_t dbi_thresh; |
141685a3 XL |
138 | DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); |
139 | struct radix_tree_root data_blocks; | |
140 | ||
7c9e7a6f AG |
141 | struct idr commands; |
142 | spinlock_t commands_lock; | |
143 | ||
144 | struct timer_list timeout; | |
af980e46 | 145 | unsigned int cmd_time_out; |
7c9e7a6f | 146 | |
b3af66e2 MC |
147 | spinlock_t nl_cmd_lock; |
148 | struct tcmu_nl_cmd curr_nl_cmd; | |
149 | /* wake up threads waiting on curr_nl_cmd */ | |
150 | wait_queue_head_t nl_cmd_wq; | |
151 | ||
7c9e7a6f | 152 | char dev_config[TCMU_CONFIG_LEN]; |
b849b456 KN |
153 | |
154 | int nl_reply_supported; | |
7c9e7a6f AG |
155 | }; |
156 | ||
157 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
158 | ||
159 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
160 | ||
161 | struct tcmu_cmd { | |
162 | struct se_cmd *se_cmd; | |
163 | struct tcmu_dev *tcmu_dev; | |
164 | ||
165 | uint16_t cmd_id; | |
166 | ||
26418649 | 167 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 168 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
169 | uint32_t dbi_cnt; |
170 | uint32_t dbi_cur; | |
171 | uint32_t *dbi; | |
7c9e7a6f AG |
172 | |
173 | unsigned long deadline; | |
174 | ||
175 | #define TCMU_CMD_BIT_EXPIRED 0 | |
176 | unsigned long flags; | |
177 | }; | |
178 | ||
b6df4b79 XL |
179 | static struct task_struct *unmap_thread; |
180 | static wait_queue_head_t unmap_wait; | |
181 | static DEFINE_MUTEX(root_udev_mutex); | |
182 | static LIST_HEAD(root_udev); | |
183 | ||
184 | static atomic_t global_db_count = ATOMIC_INIT(0); | |
185 | ||
7c9e7a6f AG |
186 | static struct kmem_cache *tcmu_cmd_cache; |
187 | ||
188 | /* multicast group */ | |
189 | enum tcmu_multicast_groups { | |
190 | TCMU_MCGRP_CONFIG, | |
191 | }; | |
192 | ||
193 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
194 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
195 | }; | |
196 | ||
b3af66e2 MC |
197 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
198 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
199 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
200 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
201 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
202 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
203 | }; | |
204 | ||
205 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
206 | { | |
207 | struct se_device *dev; | |
208 | struct tcmu_dev *udev; | |
209 | struct tcmu_nl_cmd *nl_cmd; | |
210 | int dev_id, rc, ret = 0; | |
211 | bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); | |
212 | ||
213 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
214 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
215 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
220 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
221 | ||
222 | dev = target_find_device(dev_id, !is_removed); | |
223 | if (!dev) { | |
224 | printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", | |
225 | completed_cmd, rc, dev_id); | |
226 | return -ENODEV; | |
227 | } | |
228 | udev = TCMU_DEV(dev); | |
229 | ||
230 | spin_lock(&udev->nl_cmd_lock); | |
231 | nl_cmd = &udev->curr_nl_cmd; | |
232 | ||
233 | pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, | |
234 | nl_cmd->cmd, completed_cmd, rc); | |
235 | ||
236 | if (nl_cmd->cmd != completed_cmd) { | |
237 | printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", | |
238 | completed_cmd, nl_cmd->cmd); | |
239 | ret = -EINVAL; | |
240 | } else { | |
241 | nl_cmd->status = rc; | |
242 | } | |
243 | ||
244 | spin_unlock(&udev->nl_cmd_lock); | |
245 | if (!is_removed) | |
246 | target_undepend_item(&dev->dev_group.cg_item); | |
247 | if (!ret) | |
248 | complete(&nl_cmd->complete); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
253 | { | |
254 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
255 | } | |
256 | ||
257 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
258 | { | |
259 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
260 | } | |
261 | ||
262 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
263 | struct genl_info *info) | |
264 | { | |
265 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
266 | } | |
267 | ||
268 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
269 | { | |
270 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
271 | tcmu_kern_cmd_reply_supported = | |
272 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
273 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
274 | tcmu_kern_cmd_reply_supported); | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static const struct genl_ops tcmu_genl_ops[] = { | |
281 | { | |
282 | .cmd = TCMU_CMD_SET_FEATURES, | |
283 | .flags = GENL_ADMIN_PERM, | |
284 | .policy = tcmu_attr_policy, | |
285 | .doit = tcmu_genl_set_features, | |
286 | }, | |
287 | { | |
288 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
289 | .flags = GENL_ADMIN_PERM, | |
290 | .policy = tcmu_attr_policy, | |
291 | .doit = tcmu_genl_add_dev_done, | |
292 | }, | |
293 | { | |
294 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
295 | .flags = GENL_ADMIN_PERM, | |
296 | .policy = tcmu_attr_policy, | |
297 | .doit = tcmu_genl_rm_dev_done, | |
298 | }, | |
299 | { | |
300 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
301 | .flags = GENL_ADMIN_PERM, | |
302 | .policy = tcmu_attr_policy, | |
303 | .doit = tcmu_genl_reconfig_dev_done, | |
304 | }, | |
305 | }; | |
306 | ||
7c9e7a6f | 307 | /* Our generic netlink family */ |
56989f6d | 308 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 309 | .module = THIS_MODULE, |
7c9e7a6f AG |
310 | .hdrsize = 0, |
311 | .name = "TCM-USER", | |
b3af66e2 | 312 | .version = 2, |
7c9e7a6f AG |
313 | .maxattr = TCMU_ATTR_MAX, |
314 | .mcgrps = tcmu_mcgrps, | |
315 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 316 | .netnsok = true, |
b3af66e2 MC |
317 | .ops = tcmu_genl_ops, |
318 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
319 | }; |
320 | ||
141685a3 XL |
321 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
322 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
323 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
324 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
325 | ||
b6df4b79 | 326 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
327 | { |
328 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
329 | uint32_t i; | |
330 | ||
b6df4b79 | 331 | for (i = 0; i < len; i++) |
141685a3 XL |
332 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
333 | } | |
334 | ||
b6df4b79 XL |
335 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
336 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 337 | { |
b6df4b79 XL |
338 | struct page *page; |
339 | int ret, dbi; | |
141685a3 | 340 | |
b6df4b79 XL |
341 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
342 | if (dbi == udev->dbi_thresh) | |
343 | return false; | |
141685a3 | 344 | |
b6df4b79 XL |
345 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
346 | if (!page) { | |
b6df4b79 XL |
347 | if (atomic_add_return(1, &global_db_count) > |
348 | TCMU_GLOBAL_MAX_BLOCKS) { | |
349 | atomic_dec(&global_db_count); | |
350 | return false; | |
141685a3 XL |
351 | } |
352 | ||
b6df4b79 XL |
353 | /* try to get new page from the mm */ |
354 | page = alloc_page(GFP_KERNEL); | |
355 | if (!page) | |
daf78c30 | 356 | goto err_alloc; |
b6df4b79 XL |
357 | |
358 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
daf78c30 XL |
359 | if (ret) |
360 | goto err_insert; | |
141685a3 XL |
361 | } |
362 | ||
b6df4b79 XL |
363 | if (dbi > udev->dbi_max) |
364 | udev->dbi_max = dbi; | |
365 | ||
366 | set_bit(dbi, udev->data_bitmap); | |
367 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
368 | ||
369 | return true; | |
daf78c30 XL |
370 | err_insert: |
371 | __free_page(page); | |
372 | err_alloc: | |
373 | atomic_dec(&global_db_count); | |
374 | return false; | |
141685a3 XL |
375 | } |
376 | ||
b6df4b79 XL |
377 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
378 | struct tcmu_cmd *tcmu_cmd) | |
379 | { | |
380 | int i; | |
381 | ||
382 | udev->waiting_global = false; | |
383 | ||
384 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { | |
385 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
386 | goto err; | |
387 | } | |
388 | return true; | |
389 | ||
390 | err: | |
391 | udev->waiting_global = true; | |
392 | /* Try to wake up the unmap thread */ | |
393 | wake_up(&unmap_wait); | |
394 | return false; | |
395 | } | |
396 | ||
397 | static inline struct page * | |
398 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
399 | { |
400 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
401 | } | |
402 | ||
403 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
404 | { | |
405 | kfree(tcmu_cmd->dbi); | |
406 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
407 | } | |
408 | ||
409 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
410 | { | |
411 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
412 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
413 | ||
414 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
415 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
416 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
417 | DATA_BLOCK_SIZE); | |
418 | } | |
419 | ||
420 | return data_length; | |
421 | } | |
422 | ||
423 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
424 | { | |
425 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
426 | ||
427 | return data_length / DATA_BLOCK_SIZE; | |
428 | } | |
429 | ||
7c9e7a6f AG |
430 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
431 | { | |
432 | struct se_device *se_dev = se_cmd->se_dev; | |
433 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
434 | struct tcmu_cmd *tcmu_cmd; | |
7c9e7a6f AG |
435 | |
436 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
437 | if (!tcmu_cmd) | |
438 | return NULL; | |
439 | ||
440 | tcmu_cmd->se_cmd = se_cmd; | |
441 | tcmu_cmd->tcmu_dev = udev; | |
7c9e7a6f | 442 | |
141685a3 XL |
443 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
444 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
445 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
446 | GFP_KERNEL); | |
447 | if (!tcmu_cmd->dbi) { | |
448 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
449 | return NULL; | |
450 | } | |
451 | ||
7c9e7a6f AG |
452 | return tcmu_cmd; |
453 | } | |
454 | ||
455 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
456 | { | |
b75d8063 | 457 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
458 | |
459 | size = round_up(size+offset, PAGE_SIZE); | |
460 | vaddr -= offset; | |
461 | ||
462 | while (size) { | |
463 | flush_dcache_page(virt_to_page(vaddr)); | |
464 | size -= PAGE_SIZE; | |
465 | } | |
466 | } | |
467 | ||
468 | /* | |
469 | * Some ring helper functions. We don't assume size is a power of 2 so | |
470 | * we can't use circ_buf.h. | |
471 | */ | |
472 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
473 | { | |
474 | int diff = head - tail; | |
475 | ||
476 | if (diff >= 0) | |
477 | return diff; | |
478 | else | |
479 | return size + diff; | |
480 | } | |
481 | ||
482 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
483 | { | |
484 | /* Keep 1 byte unused or we can't tell full from empty */ | |
485 | return (size - spc_used(head, tail, size) - 1); | |
486 | } | |
487 | ||
488 | static inline size_t head_to_end(size_t head, size_t size) | |
489 | { | |
490 | return size - head; | |
491 | } | |
492 | ||
f1dbd087 SY |
493 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
494 | struct tcmu_dev *udev) | |
495 | { | |
496 | struct iovec *iovec; | |
497 | ||
498 | if (*iov_cnt != 0) | |
499 | (*iov)++; | |
500 | (*iov_cnt)++; | |
501 | ||
502 | iovec = *iov; | |
503 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
504 | } |
505 | ||
7c9e7a6f AG |
506 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
507 | ||
26418649 | 508 | /* offset is relative to mb_addr */ |
141685a3 XL |
509 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
510 | int dbi, int remaining) | |
26418649 | 511 | { |
141685a3 | 512 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
513 | DATA_BLOCK_SIZE - remaining; |
514 | } | |
515 | ||
daf78c30 | 516 | static inline size_t iov_tail(struct iovec *iov) |
26418649 SY |
517 | { |
518 | return (size_t)iov->iov_base + iov->iov_len; | |
519 | } | |
520 | ||
b6df4b79 | 521 | static int scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
522 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
523 | unsigned int data_nents, struct iovec **iov, | |
524 | int *iov_cnt, bool copy_data) | |
f97ec7db | 525 | { |
141685a3 | 526 | int i, dbi; |
26418649 | 527 | int block_remaining = 0; |
141685a3 XL |
528 | void *from, *to = NULL; |
529 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 530 | struct scatterlist *sg; |
b6df4b79 | 531 | struct page *page; |
f97ec7db IT |
532 | |
533 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 534 | int sg_remaining = sg->length; |
f97ec7db | 535 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
536 | while (sg_remaining > 0) { |
537 | if (block_remaining == 0) { | |
b6df4b79 XL |
538 | if (to) |
539 | kunmap_atomic(to); | |
540 | ||
26418649 | 541 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
542 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
543 | page = tcmu_get_block_page(udev, dbi); | |
544 | to = kmap_atomic(page); | |
26418649 | 545 | } |
141685a3 | 546 | |
26418649 SY |
547 | copy_bytes = min_t(size_t, sg_remaining, |
548 | block_remaining); | |
141685a3 | 549 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 550 | block_remaining); |
141685a3 | 551 | |
26418649 | 552 | if (*iov_cnt != 0 && |
daf78c30 | 553 | to_offset == iov_tail(*iov)) { |
26418649 SY |
554 | (*iov)->iov_len += copy_bytes; |
555 | } else { | |
556 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 557 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
558 | (*iov)->iov_len = copy_bytes; |
559 | } | |
f97ec7db | 560 | if (copy_data) { |
c542942c XL |
561 | offset = DATA_BLOCK_SIZE - block_remaining; |
562 | memcpy(to + offset, | |
563 | from + sg->length - sg_remaining, | |
564 | copy_bytes); | |
f97ec7db IT |
565 | tcmu_flush_dcache_range(to, copy_bytes); |
566 | } | |
26418649 SY |
567 | sg_remaining -= copy_bytes; |
568 | block_remaining -= copy_bytes; | |
f97ec7db | 569 | } |
e2e21bd8 | 570 | kunmap_atomic(from - sg->offset); |
f97ec7db | 571 | } |
b6df4b79 XL |
572 | if (to) |
573 | kunmap_atomic(to); | |
f97ec7db | 574 | |
141685a3 | 575 | return 0; |
0c28481f SY |
576 | } |
577 | ||
a5d68ba8 XL |
578 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
579 | bool bidi) | |
f97ec7db | 580 | { |
a5d68ba8 | 581 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 582 | int i, dbi; |
26418649 | 583 | int block_remaining = 0; |
b6df4b79 | 584 | void *from = NULL, *to; |
141685a3 | 585 | size_t copy_bytes, offset; |
a5d68ba8 | 586 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 587 | struct page *page; |
a5d68ba8 | 588 | unsigned int data_nents; |
141685a3 | 589 | uint32_t count = 0; |
a5d68ba8 XL |
590 | |
591 | if (!bidi) { | |
592 | data_sg = se_cmd->t_data_sg; | |
593 | data_nents = se_cmd->t_data_nents; | |
594 | } else { | |
a5d68ba8 XL |
595 | |
596 | /* | |
597 | * For bidi case, the first count blocks are for Data-Out | |
598 | * buffer blocks, and before gathering the Data-In buffer | |
599 | * the Data-Out buffer blocks should be discarded. | |
600 | */ | |
601 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
602 | |
603 | data_sg = se_cmd->t_bidi_data_sg; | |
604 | data_nents = se_cmd->t_bidi_data_nents; | |
605 | } | |
f97ec7db | 606 | |
141685a3 XL |
607 | tcmu_cmd_set_dbi_cur(cmd, count); |
608 | ||
f97ec7db | 609 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 610 | int sg_remaining = sg->length; |
f97ec7db | 611 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
612 | while (sg_remaining > 0) { |
613 | if (block_remaining == 0) { | |
b6df4b79 XL |
614 | if (from) |
615 | kunmap_atomic(from); | |
616 | ||
26418649 | 617 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 618 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
619 | page = tcmu_get_block_page(udev, dbi); |
620 | from = kmap_atomic(page); | |
26418649 SY |
621 | } |
622 | copy_bytes = min_t(size_t, sg_remaining, | |
623 | block_remaining); | |
141685a3 | 624 | offset = DATA_BLOCK_SIZE - block_remaining; |
f97ec7db | 625 | tcmu_flush_dcache_range(from, copy_bytes); |
c542942c | 626 | memcpy(to + sg->length - sg_remaining, from + offset, |
26418649 | 627 | copy_bytes); |
f97ec7db | 628 | |
26418649 SY |
629 | sg_remaining -= copy_bytes; |
630 | block_remaining -= copy_bytes; | |
f97ec7db | 631 | } |
e2e21bd8 | 632 | kunmap_atomic(to - sg->offset); |
f97ec7db | 633 | } |
b6df4b79 XL |
634 | if (from) |
635 | kunmap_atomic(from); | |
f97ec7db IT |
636 | } |
637 | ||
b6df4b79 | 638 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 639 | { |
b6df4b79 | 640 | return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); |
26418649 SY |
641 | } |
642 | ||
7c9e7a6f | 643 | /* |
f97ec7db | 644 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 645 | * space available on the data area. |
7c9e7a6f AG |
646 | * |
647 | * Called with ring lock held. | |
648 | */ | |
b6df4b79 XL |
649 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
650 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
651 | { |
652 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
653 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
654 | / DATA_BLOCK_SIZE; | |
0241fd39 | 655 | size_t space, cmd_needed; |
7c9e7a6f AG |
656 | u32 cmd_head; |
657 | ||
658 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
659 | ||
660 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
661 | ||
f56574a2 AG |
662 | /* |
663 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
664 | * original cmd - cmds are internally contiguous. | |
665 | */ | |
666 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
667 | cmd_needed = cmd_size; | |
668 | else | |
669 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
670 | ||
7c9e7a6f AG |
671 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
672 | if (space < cmd_needed) { | |
673 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
674 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
675 | return false; | |
676 | } | |
677 | ||
b6df4b79 XL |
678 | /* try to check and get the data blocks as needed */ |
679 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
7c9e7a6f | 680 | if (space < data_needed) { |
b6df4b79 XL |
681 | unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; |
682 | unsigned long grow; | |
683 | ||
684 | if (blocks_left < blocks_needed) { | |
685 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
686 | blocks_left * DATA_BLOCK_SIZE, | |
687 | data_needed); | |
688 | return false; | |
689 | } | |
690 | ||
691 | /* Try to expand the thresh */ | |
692 | if (!udev->dbi_thresh) { | |
693 | /* From idle state */ | |
694 | uint32_t init_thresh = DATA_BLOCK_INIT_BITS; | |
695 | ||
696 | udev->dbi_thresh = max(blocks_needed, init_thresh); | |
697 | } else { | |
698 | /* | |
699 | * Grow the data area by max(blocks needed, | |
700 | * dbi_thresh / 2), but limited to the max | |
701 | * DATA_BLOCK_BITS size. | |
702 | */ | |
703 | grow = max(blocks_needed, udev->dbi_thresh / 2); | |
704 | udev->dbi_thresh += grow; | |
705 | if (udev->dbi_thresh > DATA_BLOCK_BITS) | |
706 | udev->dbi_thresh = DATA_BLOCK_BITS; | |
707 | } | |
7c9e7a6f AG |
708 | } |
709 | ||
daf78c30 | 710 | return tcmu_get_empty_blocks(udev, cmd); |
7c9e7a6f AG |
711 | } |
712 | ||
fe25cc34 XL |
713 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
714 | { | |
715 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
716 | sizeof(struct tcmu_cmd_entry)); | |
717 | } | |
718 | ||
719 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
720 | size_t base_command_size) | |
721 | { | |
722 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
723 | size_t command_size; | |
724 | ||
725 | command_size = base_command_size + | |
726 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
727 | TCMU_OP_ALIGN_SIZE); | |
728 | ||
729 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
730 | ||
731 | return command_size; | |
732 | } | |
733 | ||
0d44374c MC |
734 | static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd) |
735 | { | |
736 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
737 | unsigned long tmo = udev->cmd_time_out; | |
738 | int cmd_id; | |
739 | ||
740 | if (tcmu_cmd->cmd_id) | |
741 | return 0; | |
742 | ||
743 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); | |
744 | if (cmd_id < 0) { | |
745 | pr_err("tcmu: Could not allocate cmd id.\n"); | |
746 | return cmd_id; | |
747 | } | |
748 | tcmu_cmd->cmd_id = cmd_id; | |
749 | ||
750 | if (!tmo) | |
751 | return 0; | |
752 | ||
753 | tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); | |
754 | mod_timer(&udev->timeout, tcmu_cmd->deadline); | |
755 | return 0; | |
756 | } | |
757 | ||
02eb924f AG |
758 | static sense_reason_t |
759 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
760 | { |
761 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
762 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
763 | size_t base_command_size, command_size; | |
7c9e7a6f | 764 | struct tcmu_mailbox *mb; |
7c9e7a6f | 765 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 766 | struct iovec *iov; |
141685a3 | 767 | int iov_cnt, ret; |
7c9e7a6f AG |
768 | uint32_t cmd_head; |
769 | uint64_t cdb_off; | |
f97ec7db | 770 | bool copy_to_data_area; |
ab22d260 | 771 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
772 | |
773 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 774 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
775 | |
776 | /* | |
777 | * Must be a certain minimum size for response sense info, but | |
778 | * also may be larger if the iov array is large. | |
779 | * | |
fe25cc34 XL |
780 | * We prepare as many iovs as possbile for potential uses here, |
781 | * because it's expensive to tell how many regions are freed in | |
782 | * the bitmap & global data pool, as the size calculated here | |
783 | * will only be used to do the checks. | |
784 | * | |
785 | * The size will be recalculated later as actually needed to save | |
786 | * cmd area memories. | |
787 | */ | |
788 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
789 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 790 | |
b6df4b79 | 791 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
792 | |
793 | mb = udev->mb_addr; | |
794 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
795 | if ((command_size > (udev->cmdr_size / 2)) || |
796 | data_length > udev->data_size) { | |
797 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 798 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 799 | udev->cmdr_size, udev->data_size); |
b6df4b79 | 800 | mutex_unlock(&udev->cmdr_lock); |
554617b2 AG |
801 | return TCM_INVALID_CDB_FIELD; |
802 | } | |
7c9e7a6f | 803 | |
b6df4b79 | 804 | while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
7c9e7a6f AG |
805 | int ret; |
806 | DEFINE_WAIT(__wait); | |
807 | ||
808 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
809 | ||
810 | pr_debug("sleeping for ring space\n"); | |
b6df4b79 | 811 | mutex_unlock(&udev->cmdr_lock); |
af980e46 MC |
812 | if (udev->cmd_time_out) |
813 | ret = schedule_timeout( | |
814 | msecs_to_jiffies(udev->cmd_time_out)); | |
815 | else | |
816 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
817 | finish_wait(&udev->wait_cmdr, &__wait); |
818 | if (!ret) { | |
819 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 820 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
821 | } |
822 | ||
b6df4b79 | 823 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
824 | |
825 | /* We dropped cmdr_lock, cmd_head is stale */ | |
826 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
827 | } | |
828 | ||
f56574a2 AG |
829 | /* Insert a PAD if end-of-ring space is too small */ |
830 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
831 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
832 | ||
7c9e7a6f | 833 | entry = (void *) mb + CMDR_OFF + cmd_head; |
0ad46af8 AG |
834 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
835 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
836 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
837 | entry->hdr.kflags = 0; | |
838 | entry->hdr.uflags = 0; | |
9d62bc0e | 839 | tcmu_flush_dcache_range(entry, sizeof(*entry)); |
7c9e7a6f AG |
840 | |
841 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
9d62bc0e | 842 | tcmu_flush_dcache_range(mb, sizeof(*mb)); |
7c9e7a6f AG |
843 | |
844 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
845 | WARN_ON(cmd_head != 0); | |
846 | } | |
847 | ||
848 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
b3743c71 | 849 | memset(entry, 0, command_size); |
0ad46af8 | 850 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
7c9e7a6f | 851 | |
3d9b9555 | 852 | /* Handle allocating space from the data area */ |
b6df4b79 | 853 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 854 | iov = &entry->req.iov[0]; |
f97ec7db | 855 | iov_cnt = 0; |
e4648b01 IT |
856 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
857 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
b6df4b79 XL |
858 | ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
859 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
860 | copy_to_data_area); | |
141685a3 | 861 | if (ret) { |
b6df4b79 XL |
862 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
863 | mutex_unlock(&udev->cmdr_lock); | |
864 | ||
141685a3 XL |
865 | pr_err("tcmu: alloc and scatter data failed\n"); |
866 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
867 | } | |
7c9e7a6f AG |
868 | entry->req.iov_cnt = iov_cnt; |
869 | ||
e4648b01 | 870 | /* Handle BIDI commands */ |
b3743c71 | 871 | iov_cnt = 0; |
ab22d260 | 872 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 873 | iov++; |
b6df4b79 | 874 | ret = scatter_data_area(udev, tcmu_cmd, |
141685a3 XL |
875 | se_cmd->t_bidi_data_sg, |
876 | se_cmd->t_bidi_data_nents, | |
877 | &iov, &iov_cnt, false); | |
878 | if (ret) { | |
b6df4b79 XL |
879 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
880 | mutex_unlock(&udev->cmdr_lock); | |
881 | ||
141685a3 XL |
882 | pr_err("tcmu: alloc and scatter bidi data failed\n"); |
883 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
884 | } | |
ab22d260 | 885 | } |
b3743c71 | 886 | entry->req.iov_bidi_cnt = iov_cnt; |
26418649 | 887 | |
0d44374c MC |
888 | ret = tcmu_setup_cmd_timer(tcmu_cmd); |
889 | if (ret) { | |
890 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); | |
97488c73 | 891 | mutex_unlock(&udev->cmdr_lock); |
0d44374c MC |
892 | return TCM_OUT_OF_RESOURCES; |
893 | } | |
894 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
895 | ||
fe25cc34 XL |
896 | /* |
897 | * Recalaulate the command's base size and size according | |
898 | * to the actual needs | |
899 | */ | |
900 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
901 | entry->req.iov_bidi_cnt); | |
902 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
903 | ||
904 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
905 | ||
7c9e7a6f AG |
906 | /* All offsets relative to mb_addr, not start of entry! */ |
907 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
908 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
909 | entry->req.cdb_off = cdb_off; | |
910 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
911 | ||
912 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
913 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
b6df4b79 | 914 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
915 | |
916 | /* TODO: only if FLUSH and FUA? */ | |
917 | uio_event_notify(&udev->uio_info); | |
918 | ||
af980e46 MC |
919 | if (udev->cmd_time_out) |
920 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
921 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 922 | |
02eb924f | 923 | return TCM_NO_SENSE; |
7c9e7a6f AG |
924 | } |
925 | ||
02eb924f AG |
926 | static sense_reason_t |
927 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f | 928 | { |
7c9e7a6f | 929 | struct tcmu_cmd *tcmu_cmd; |
ecaf597b | 930 | sense_reason_t ret; |
7c9e7a6f AG |
931 | |
932 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
933 | if (!tcmu_cmd) | |
02eb924f | 934 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
935 | |
936 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 937 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f | 938 | pr_err("TCMU: Could not queue command\n"); |
7c9e7a6f | 939 | |
141685a3 | 940 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
941 | } |
942 | ||
943 | return ret; | |
944 | } | |
945 | ||
946 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
947 | { | |
948 | struct se_cmd *se_cmd = cmd->se_cmd; | |
949 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
950 | ||
141685a3 XL |
951 | /* |
952 | * cmd has been completed already from timeout, just reclaim | |
953 | * data area space and free cmd | |
954 | */ | |
955 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
956 | goto out; | |
b25c7863 | 957 | |
141685a3 | 958 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 959 | |
0ad46af8 | 960 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
961 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
962 | cmd->se_cmd); | |
ed97d0cd AG |
963 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
964 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 965 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
e4648b01 | 966 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 967 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 968 | gather_data_area(udev, cmd, true); |
e4648b01 | 969 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 970 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 971 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 972 | /* TODO: */ |
2bc396a2 IT |
973 | } else if (se_cmd->data_direction != DMA_NONE) { |
974 | pr_warn("TCMU: data direction was %d!\n", | |
975 | se_cmd->data_direction); | |
7c9e7a6f AG |
976 | } |
977 | ||
978 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 979 | |
141685a3 XL |
980 | out: |
981 | cmd->se_cmd = NULL; | |
b6df4b79 | 982 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 983 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
984 | } |
985 | ||
986 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
987 | { | |
988 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
989 | int handled = 0; |
990 | ||
991 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
992 | pr_err("ring broken, not handling completions\n"); | |
993 | return 0; | |
994 | } | |
995 | ||
7c9e7a6f AG |
996 | mb = udev->mb_addr; |
997 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
998 | ||
6aa7de05 | 999 | while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
7c9e7a6f AG |
1000 | |
1001 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
1002 | struct tcmu_cmd *cmd; | |
1003 | ||
1004 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
1005 | ||
0ad46af8 AG |
1006 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
1007 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
1008 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1009 | udev->cmdr_size); | |
7c9e7a6f AG |
1010 | continue; |
1011 | } | |
0ad46af8 | 1012 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
1013 | |
1014 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 1015 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
1016 | spin_unlock(&udev->commands_lock); |
1017 | ||
1018 | if (!cmd) { | |
1019 | pr_err("cmd_id not found, ring is broken\n"); | |
1020 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1021 | break; | |
1022 | } | |
1023 | ||
1024 | tcmu_handle_completion(cmd, entry); | |
1025 | ||
0ad46af8 AG |
1026 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1027 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1028 | udev->cmdr_size); | |
7c9e7a6f AG |
1029 | |
1030 | handled++; | |
1031 | } | |
1032 | ||
1033 | if (mb->cmd_tail == mb->cmd_head) | |
1034 | del_timer(&udev->timeout); /* no more pending cmds */ | |
1035 | ||
7c9e7a6f AG |
1036 | wake_up(&udev->wait_cmdr); |
1037 | ||
1038 | return handled; | |
1039 | } | |
1040 | ||
1041 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
1042 | { | |
1043 | struct tcmu_cmd *cmd = p; | |
1044 | ||
1045 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
1046 | return 0; | |
1047 | ||
611e2267 | 1048 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
1049 | return 0; |
1050 | ||
1051 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1052 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
1053 | cmd->se_cmd = NULL; | |
1054 | ||
7c9e7a6f AG |
1055 | return 0; |
1056 | } | |
1057 | ||
e99e88a9 | 1058 | static void tcmu_device_timedout(struct timer_list *t) |
7c9e7a6f | 1059 | { |
e99e88a9 | 1060 | struct tcmu_dev *udev = from_timer(udev, t, timeout); |
7c9e7a6f | 1061 | unsigned long flags; |
7c9e7a6f AG |
1062 | |
1063 | spin_lock_irqsave(&udev->commands_lock, flags); | |
1064 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
1065 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
1066 | ||
b6df4b79 XL |
1067 | /* Try to wake up the ummap thread */ |
1068 | wake_up(&unmap_wait); | |
1069 | ||
7c9e7a6f AG |
1070 | /* |
1071 | * We don't need to wakeup threads on wait_cmdr since they have their | |
1072 | * own timeout. | |
1073 | */ | |
1074 | } | |
1075 | ||
1076 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
1077 | { | |
1078 | struct tcmu_hba *tcmu_hba; | |
1079 | ||
1080 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1081 | if (!tcmu_hba) | |
1082 | return -ENOMEM; | |
1083 | ||
1084 | tcmu_hba->host_id = host_id; | |
1085 | hba->hba_ptr = tcmu_hba; | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | static void tcmu_detach_hba(struct se_hba *hba) | |
1091 | { | |
1092 | kfree(hba->hba_ptr); | |
1093 | hba->hba_ptr = NULL; | |
1094 | } | |
1095 | ||
1096 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1097 | { | |
1098 | struct tcmu_dev *udev; | |
1099 | ||
1100 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1101 | if (!udev) | |
1102 | return NULL; | |
f3cdbe39 | 1103 | kref_init(&udev->kref); |
7c9e7a6f AG |
1104 | |
1105 | udev->name = kstrdup(name, GFP_KERNEL); | |
1106 | if (!udev->name) { | |
1107 | kfree(udev); | |
1108 | return NULL; | |
1109 | } | |
1110 | ||
1111 | udev->hba = hba; | |
af980e46 | 1112 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
1113 | |
1114 | init_waitqueue_head(&udev->wait_cmdr); | |
b6df4b79 | 1115 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f AG |
1116 | |
1117 | idr_init(&udev->commands); | |
1118 | spin_lock_init(&udev->commands_lock); | |
1119 | ||
e99e88a9 | 1120 | timer_setup(&udev->timeout, tcmu_device_timedout, 0); |
7c9e7a6f | 1121 | |
b3af66e2 MC |
1122 | init_waitqueue_head(&udev->nl_cmd_wq); |
1123 | spin_lock_init(&udev->nl_cmd_lock); | |
1124 | ||
c22adc0b XL |
1125 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
1126 | ||
7c9e7a6f AG |
1127 | return &udev->se_dev; |
1128 | } | |
1129 | ||
1130 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
1131 | { | |
1132 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
1133 | ||
b6df4b79 | 1134 | mutex_lock(&tcmu_dev->cmdr_lock); |
7c9e7a6f | 1135 | tcmu_handle_completions(tcmu_dev); |
b6df4b79 | 1136 | mutex_unlock(&tcmu_dev->cmdr_lock); |
7c9e7a6f AG |
1137 | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1143 | * and this stuff must come along. | |
1144 | */ | |
1145 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1146 | { | |
1147 | struct tcmu_dev *udev = vma->vm_private_data; | |
1148 | struct uio_info *info = &udev->uio_info; | |
1149 | ||
1150 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1151 | if (info->mem[vma->vm_pgoff].size == 0) | |
1152 | return -1; | |
1153 | return (int)vma->vm_pgoff; | |
1154 | } | |
1155 | return -1; | |
1156 | } | |
1157 | ||
b6df4b79 XL |
1158 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1159 | { | |
1160 | struct page *page; | |
1161 | int ret; | |
1162 | ||
1163 | mutex_lock(&udev->cmdr_lock); | |
1164 | page = tcmu_get_block_page(udev, dbi); | |
1165 | if (likely(page)) { | |
1166 | mutex_unlock(&udev->cmdr_lock); | |
1167 | return page; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Normally it shouldn't be here: | |
1172 | * Only when the userspace has touched the blocks which | |
1173 | * are out of the tcmu_cmd's data iov[], and will return | |
1174 | * one zeroed page. | |
1175 | */ | |
1176 | pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); | |
1177 | pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); | |
1178 | ||
1179 | if (dbi >= udev->dbi_thresh) { | |
1180 | /* Extern the udev->dbi_thresh to dbi + 1 */ | |
1181 | udev->dbi_thresh = dbi + 1; | |
1182 | udev->dbi_max = dbi; | |
1183 | } | |
1184 | ||
1185 | page = radix_tree_lookup(&udev->data_blocks, dbi); | |
1186 | if (!page) { | |
1187 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1188 | if (!page) { | |
1189 | mutex_unlock(&udev->cmdr_lock); | |
1190 | return NULL; | |
1191 | } | |
1192 | ||
1193 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
1194 | if (ret) { | |
1195 | mutex_unlock(&udev->cmdr_lock); | |
1196 | __free_page(page); | |
1197 | return NULL; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * Since this case is rare in page fault routine, here we | |
1202 | * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS | |
1203 | * to reduce possible page fault call trace. | |
1204 | */ | |
1205 | atomic_inc(&global_db_count); | |
1206 | } | |
1207 | mutex_unlock(&udev->cmdr_lock); | |
1208 | ||
1209 | return page; | |
1210 | } | |
1211 | ||
11bac800 | 1212 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1213 | { |
11bac800 | 1214 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1215 | struct uio_info *info = &udev->uio_info; |
1216 | struct page *page; | |
1217 | unsigned long offset; | |
1218 | void *addr; | |
1219 | ||
11bac800 | 1220 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1221 | if (mi < 0) |
1222 | return VM_FAULT_SIGBUS; | |
1223 | ||
1224 | /* | |
1225 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1226 | * to use mem[N]. | |
1227 | */ | |
1228 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1229 | ||
141685a3 XL |
1230 | if (offset < udev->data_off) { |
1231 | /* For the vmalloc()ed cmd area pages */ | |
1232 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1233 | page = vmalloc_to_page(addr); |
141685a3 | 1234 | } else { |
141685a3 XL |
1235 | uint32_t dbi; |
1236 | ||
b6df4b79 | 1237 | /* For the dynamically growing data area pages */ |
141685a3 | 1238 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1239 | page = tcmu_try_get_block_page(udev, dbi); |
1240 | if (!page) | |
141685a3 | 1241 | return VM_FAULT_NOPAGE; |
141685a3 XL |
1242 | } |
1243 | ||
7c9e7a6f AG |
1244 | get_page(page); |
1245 | vmf->page = page; | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1250 | .fault = tcmu_vma_fault, | |
1251 | }; | |
1252 | ||
1253 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1254 | { | |
1255 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1256 | ||
1257 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1258 | vma->vm_ops = &tcmu_vm_ops; | |
1259 | ||
1260 | vma->vm_private_data = udev; | |
1261 | ||
1262 | /* Ensure the mmap is exactly the right size */ | |
1263 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1264 | return -EINVAL; | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1270 | { | |
1271 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1272 | ||
1273 | /* O_EXCL not supported for char devs, so fake it? */ | |
1274 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1275 | return -EBUSY; | |
1276 | ||
b6df4b79 | 1277 | udev->inode = inode; |
9260695d | 1278 | kref_get(&udev->kref); |
b6df4b79 | 1279 | |
7c9e7a6f AG |
1280 | pr_debug("open\n"); |
1281 | ||
1282 | return 0; | |
1283 | } | |
1284 | ||
f3cdbe39 MC |
1285 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1286 | { | |
1287 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1288 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1289 | ||
1290 | kfree(udev->uio_info.name); | |
1291 | kfree(udev->name); | |
1292 | kfree(udev); | |
1293 | } | |
1294 | ||
c22adc0b XL |
1295 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
1296 | { | |
1297 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
1298 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
1299 | return 0; | |
1300 | } | |
1301 | return -EINVAL; | |
1302 | } | |
1303 | ||
1304 | static void tcmu_blocks_release(struct tcmu_dev *udev) | |
1305 | { | |
1306 | int i; | |
1307 | struct page *page; | |
1308 | ||
1309 | /* Try to release all block pages */ | |
1310 | mutex_lock(&udev->cmdr_lock); | |
1311 | for (i = 0; i <= udev->dbi_max; i++) { | |
1312 | page = radix_tree_delete(&udev->data_blocks, i); | |
1313 | if (page) { | |
1314 | __free_page(page); | |
1315 | atomic_dec(&global_db_count); | |
1316 | } | |
1317 | } | |
1318 | mutex_unlock(&udev->cmdr_lock); | |
1319 | } | |
1320 | ||
f3cdbe39 MC |
1321 | static void tcmu_dev_kref_release(struct kref *kref) |
1322 | { | |
1323 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1324 | struct se_device *dev = &udev->se_dev; | |
c22adc0b XL |
1325 | struct tcmu_cmd *cmd; |
1326 | bool all_expired = true; | |
1327 | int i; | |
1328 | ||
1329 | vfree(udev->mb_addr); | |
1330 | udev->mb_addr = NULL; | |
1331 | ||
1332 | /* Upper layer should drain all requests before calling this */ | |
1333 | spin_lock_irq(&udev->commands_lock); | |
1334 | idr_for_each_entry(&udev->commands, cmd, i) { | |
1335 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1336 | all_expired = false; | |
1337 | } | |
1338 | idr_destroy(&udev->commands); | |
1339 | spin_unlock_irq(&udev->commands_lock); | |
1340 | WARN_ON(!all_expired); | |
1341 | ||
1342 | tcmu_blocks_release(udev); | |
f3cdbe39 MC |
1343 | |
1344 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1345 | } | |
1346 | ||
7c9e7a6f AG |
1347 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1348 | { | |
1349 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1350 | ||
1351 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1352 | ||
1353 | pr_debug("close\n"); | |
9260695d | 1354 | /* release ref from open */ |
f3cdbe39 | 1355 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1356 | return 0; |
1357 | } | |
1358 | ||
b3af66e2 MC |
1359 | static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
1360 | { | |
1361 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1362 | ||
1363 | if (!tcmu_kern_cmd_reply_supported) | |
1364 | return; | |
b849b456 KN |
1365 | |
1366 | if (udev->nl_reply_supported <= 0) | |
1367 | return; | |
1368 | ||
b3af66e2 MC |
1369 | relock: |
1370 | spin_lock(&udev->nl_cmd_lock); | |
1371 | ||
1372 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
1373 | spin_unlock(&udev->nl_cmd_lock); | |
1374 | pr_debug("sleeping for open nl cmd\n"); | |
1375 | wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); | |
1376 | goto relock; | |
1377 | } | |
1378 | ||
1379 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1380 | nl_cmd->cmd = cmd; | |
1381 | init_completion(&nl_cmd->complete); | |
1382 | ||
1383 | spin_unlock(&udev->nl_cmd_lock); | |
1384 | } | |
1385 | ||
1386 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) | |
1387 | { | |
1388 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1389 | int ret; | |
1390 | DEFINE_WAIT(__wait); | |
1391 | ||
1392 | if (!tcmu_kern_cmd_reply_supported) | |
1393 | return 0; | |
1394 | ||
b849b456 KN |
1395 | if (udev->nl_reply_supported <= 0) |
1396 | return 0; | |
1397 | ||
b3af66e2 MC |
1398 | pr_debug("sleeping for nl reply\n"); |
1399 | wait_for_completion(&nl_cmd->complete); | |
1400 | ||
1401 | spin_lock(&udev->nl_cmd_lock); | |
1402 | nl_cmd->cmd = TCMU_CMD_UNSPEC; | |
1403 | ret = nl_cmd->status; | |
1404 | nl_cmd->status = 0; | |
1405 | spin_unlock(&udev->nl_cmd_lock); | |
1406 | ||
1407 | wake_up_all(&udev->nl_cmd_wq); | |
1408 | ||
1409 | return ret;; | |
1410 | } | |
1411 | ||
1412 | static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, | |
1413 | int reconfig_attr, const void *reconfig_data) | |
7c9e7a6f AG |
1414 | { |
1415 | struct sk_buff *skb; | |
1416 | void *msg_header; | |
6e14eab9 | 1417 | int ret = -ENOMEM; |
7c9e7a6f AG |
1418 | |
1419 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1420 | if (!skb) | |
6e14eab9 | 1421 | return ret; |
7c9e7a6f AG |
1422 | |
1423 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1424 | if (!msg_header) |
1425 | goto free_skb; | |
7c9e7a6f | 1426 | |
b3af66e2 | 1427 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1428 | if (ret < 0) |
1429 | goto free_skb; | |
7c9e7a6f | 1430 | |
b3af66e2 MC |
1431 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1432 | if (ret < 0) | |
1433 | goto free_skb; | |
1434 | ||
1435 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1436 | if (ret < 0) |
1437 | goto free_skb; | |
7c9e7a6f | 1438 | |
2d76443e MC |
1439 | if (cmd == TCMU_CMD_RECONFIG_DEVICE) { |
1440 | switch (reconfig_attr) { | |
1441 | case TCMU_ATTR_DEV_CFG: | |
1442 | ret = nla_put_string(skb, reconfig_attr, reconfig_data); | |
1443 | break; | |
1444 | case TCMU_ATTR_DEV_SIZE: | |
1445 | ret = nla_put_u64_64bit(skb, reconfig_attr, | |
1446 | *((u64 *)reconfig_data), | |
1447 | TCMU_ATTR_PAD); | |
1448 | break; | |
1449 | case TCMU_ATTR_WRITECACHE: | |
1450 | ret = nla_put_u8(skb, reconfig_attr, | |
1451 | *((u8 *)reconfig_data)); | |
1452 | break; | |
1453 | default: | |
1454 | BUG(); | |
1455 | } | |
1456 | ||
1457 | if (ret < 0) | |
1458 | goto free_skb; | |
1459 | } | |
8a45885c | 1460 | |
053c095a | 1461 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1462 | |
b3af66e2 MC |
1463 | tcmu_init_genl_cmd_reply(udev, cmd); |
1464 | ||
20c08b36 | 1465 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f | 1466 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
7c9e7a6f AG |
1467 | /* We don't care if no one is listening */ |
1468 | if (ret == -ESRCH) | |
1469 | ret = 0; | |
b3af66e2 MC |
1470 | if (!ret) |
1471 | ret = tcmu_wait_genl_cmd_reply(udev); | |
7c9e7a6f AG |
1472 | |
1473 | return ret; | |
6e14eab9 NB |
1474 | free_skb: |
1475 | nlmsg_free(skb); | |
1476 | return ret; | |
7c9e7a6f AG |
1477 | } |
1478 | ||
de8c5221 | 1479 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 1480 | { |
7c9e7a6f AG |
1481 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
1482 | struct uio_info *info; | |
de8c5221 | 1483 | size_t size, used; |
7c9e7a6f AG |
1484 | char *str; |
1485 | ||
1486 | info = &udev->uio_info; | |
7c9e7a6f AG |
1487 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, |
1488 | udev->dev_config); | |
1489 | size += 1; /* for \0 */ | |
1490 | str = kmalloc(size, GFP_KERNEL); | |
1491 | if (!str) | |
1492 | return -ENOMEM; | |
1493 | ||
1494 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
7c9e7a6f AG |
1495 | if (udev->dev_config[0]) |
1496 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1497 | ||
ededd039 BL |
1498 | /* If the old string exists, free it */ |
1499 | kfree(info->name); | |
7c9e7a6f AG |
1500 | info->name = str; |
1501 | ||
de8c5221 BL |
1502 | return 0; |
1503 | } | |
1504 | ||
1505 | static int tcmu_configure_device(struct se_device *dev) | |
1506 | { | |
1507 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1508 | struct uio_info *info; | |
1509 | struct tcmu_mailbox *mb; | |
1510 | int ret = 0; | |
1511 | ||
1512 | ret = tcmu_update_uio_info(udev); | |
1513 | if (ret) | |
1514 | return ret; | |
1515 | ||
1516 | info = &udev->uio_info; | |
1517 | ||
141685a3 | 1518 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1519 | if (!udev->mb_addr) { |
1520 | ret = -ENOMEM; | |
1521 | goto err_vzalloc; | |
1522 | } | |
1523 | ||
1524 | /* mailbox fits in first part of CMDR space */ | |
1525 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1526 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1527 | udev->data_size = DATA_SIZE; |
b6df4b79 XL |
1528 | udev->dbi_thresh = 0; /* Default in Idle state */ |
1529 | udev->waiting_global = false; | |
7c9e7a6f | 1530 | |
141685a3 | 1531 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1532 | mb = udev->mb_addr; |
0ad46af8 | 1533 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1534 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1535 | mb->cmdr_off = CMDR_OFF; |
1536 | mb->cmdr_size = udev->cmdr_size; | |
1537 | ||
1538 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1539 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1540 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1541 | |
ac64a2ce | 1542 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1543 | |
1544 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1545 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1546 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1547 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1548 | |
1549 | info->irqcontrol = tcmu_irqcontrol; | |
1550 | info->irq = UIO_IRQ_CUSTOM; | |
1551 | ||
1552 | info->mmap = tcmu_mmap; | |
1553 | info->open = tcmu_open; | |
1554 | info->release = tcmu_release; | |
1555 | ||
1556 | ret = uio_register_device(tcmu_root_device, info); | |
1557 | if (ret) | |
1558 | goto err_register; | |
1559 | ||
81ee28de SY |
1560 | /* User can set hw_block_size before enable the device */ |
1561 | if (dev->dev_attrib.hw_block_size == 0) | |
1562 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1563 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1564 | if (!dev->dev_attrib.hw_max_sectors) |
1565 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
1566 | if (!dev->dev_attrib.emulate_write_cache) |
1567 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
1568 | dev->dev_attrib.hw_queue_depth = 128; |
1569 | ||
b849b456 KN |
1570 | /* If user didn't explicitly disable netlink reply support, use |
1571 | * module scope setting. | |
1572 | */ | |
1573 | if (udev->nl_reply_supported >= 0) | |
1574 | udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; | |
1575 | ||
f3cdbe39 MC |
1576 | /* |
1577 | * Get a ref incase userspace does a close on the uio device before | |
1578 | * LIO has initiated tcmu_free_device. | |
1579 | */ | |
1580 | kref_get(&udev->kref); | |
1581 | ||
b3af66e2 | 1582 | ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); |
7c9e7a6f AG |
1583 | if (ret) |
1584 | goto err_netlink; | |
1585 | ||
b6df4b79 XL |
1586 | mutex_lock(&root_udev_mutex); |
1587 | list_add(&udev->node, &root_udev); | |
1588 | mutex_unlock(&root_udev_mutex); | |
1589 | ||
7c9e7a6f AG |
1590 | return 0; |
1591 | ||
1592 | err_netlink: | |
f3cdbe39 | 1593 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1594 | uio_unregister_device(&udev->uio_info); |
1595 | err_register: | |
1596 | vfree(udev->mb_addr); | |
c22adc0b | 1597 | udev->mb_addr = NULL; |
7c9e7a6f AG |
1598 | err_vzalloc: |
1599 | kfree(info->name); | |
f3cdbe39 | 1600 | info->name = NULL; |
7c9e7a6f AG |
1601 | |
1602 | return ret; | |
1603 | } | |
1604 | ||
972c7f16 MC |
1605 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1606 | { | |
1607 | return udev->uio_info.uio_dev ? true : false; | |
1608 | } | |
1609 | ||
7c9e7a6f | 1610 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
1611 | { |
1612 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1613 | ||
1614 | /* release ref from init */ | |
1615 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1616 | } | |
1617 | ||
1618 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
1619 | { |
1620 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
7c9e7a6f AG |
1621 | |
1622 | del_timer_sync(&udev->timeout); | |
1623 | ||
b6df4b79 XL |
1624 | mutex_lock(&root_udev_mutex); |
1625 | list_del(&udev->node); | |
1626 | mutex_unlock(&root_udev_mutex); | |
1627 | ||
531283ff | 1628 | tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); |
7c9e7a6f | 1629 | |
531283ff | 1630 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
1631 | |
1632 | /* release ref from configure */ | |
1633 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
1634 | } |
1635 | ||
1636 | enum { | |
3abaa2bf | 1637 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
b849b456 | 1638 | Opt_nl_reply_supported, Opt_err, |
7c9e7a6f AG |
1639 | }; |
1640 | ||
1641 | static match_table_t tokens = { | |
1642 | {Opt_dev_config, "dev_config=%s"}, | |
1643 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1644 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1645 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
b849b456 | 1646 | {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
7c9e7a6f AG |
1647 | {Opt_err, NULL} |
1648 | }; | |
1649 | ||
3abaa2bf MC |
1650 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1651 | { | |
1652 | unsigned long tmp_ul; | |
1653 | char *arg_p; | |
1654 | int ret; | |
1655 | ||
1656 | arg_p = match_strdup(arg); | |
1657 | if (!arg_p) | |
1658 | return -ENOMEM; | |
1659 | ||
1660 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1661 | kfree(arg_p); | |
1662 | if (ret < 0) { | |
1663 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1664 | return ret; | |
1665 | } | |
1666 | if (!tmp_ul) { | |
1667 | pr_err("dev attrib must be nonzero\n"); | |
1668 | return -EINVAL; | |
1669 | } | |
1670 | *dev_attrib = tmp_ul; | |
1671 | return 0; | |
1672 | } | |
1673 | ||
7c9e7a6f AG |
1674 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1675 | const char *page, ssize_t count) | |
1676 | { | |
1677 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1678 | char *orig, *ptr, *opts, *arg_p; | |
1679 | substring_t args[MAX_OPT_ARGS]; | |
1680 | int ret = 0, token; | |
7c9e7a6f AG |
1681 | |
1682 | opts = kstrdup(page, GFP_KERNEL); | |
1683 | if (!opts) | |
1684 | return -ENOMEM; | |
1685 | ||
1686 | orig = opts; | |
1687 | ||
1688 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1689 | if (!*ptr) | |
1690 | continue; | |
1691 | ||
1692 | token = match_token(ptr, tokens, args); | |
1693 | switch (token) { | |
1694 | case Opt_dev_config: | |
1695 | if (match_strlcpy(udev->dev_config, &args[0], | |
1696 | TCMU_CONFIG_LEN) == 0) { | |
1697 | ret = -EINVAL; | |
1698 | break; | |
1699 | } | |
1700 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1701 | break; | |
1702 | case Opt_dev_size: | |
1703 | arg_p = match_strdup(&args[0]); | |
1704 | if (!arg_p) { | |
1705 | ret = -ENOMEM; | |
1706 | break; | |
1707 | } | |
1708 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1709 | kfree(arg_p); | |
1710 | if (ret < 0) | |
1711 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1712 | break; | |
9c1cd1b6 | 1713 | case Opt_hw_block_size: |
3abaa2bf MC |
1714 | ret = tcmu_set_dev_attrib(&args[0], |
1715 | &(dev->dev_attrib.hw_block_size)); | |
1716 | break; | |
1717 | case Opt_hw_max_sectors: | |
1718 | ret = tcmu_set_dev_attrib(&args[0], | |
1719 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1720 | break; |
b849b456 KN |
1721 | case Opt_nl_reply_supported: |
1722 | arg_p = match_strdup(&args[0]); | |
1723 | if (!arg_p) { | |
1724 | ret = -ENOMEM; | |
1725 | break; | |
1726 | } | |
16b93277 | 1727 | ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported); |
b849b456 KN |
1728 | kfree(arg_p); |
1729 | if (ret < 0) | |
16b93277 | 1730 | pr_err("kstrtoint() failed for nl_reply_supported=\n"); |
b849b456 | 1731 | break; |
7c9e7a6f AG |
1732 | default: |
1733 | break; | |
1734 | } | |
2579325c MC |
1735 | |
1736 | if (ret) | |
1737 | break; | |
7c9e7a6f AG |
1738 | } |
1739 | ||
1740 | kfree(orig); | |
1741 | return (!ret) ? count : ret; | |
1742 | } | |
1743 | ||
1744 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1745 | { | |
1746 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1747 | ssize_t bl = 0; | |
1748 | ||
1749 | bl = sprintf(b + bl, "Config: %s ", | |
1750 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1751 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1752 | |
1753 | return bl; | |
1754 | } | |
1755 | ||
1756 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1757 | { | |
1758 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1759 | ||
1760 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1761 | dev->dev_attrib.block_size); | |
1762 | } | |
1763 | ||
7c9e7a6f | 1764 | static sense_reason_t |
9c1cd1b6 | 1765 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1766 | { |
02eb924f | 1767 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1768 | } |
1769 | ||
7d7a7435 NB |
1770 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1771 | { | |
1772 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1773 | struct se_dev_attrib, da_group); | |
b5ab697c | 1774 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
7d7a7435 NB |
1775 | |
1776 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1777 | } | |
1778 | ||
1779 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1780 | size_t count) | |
1781 | { | |
1782 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1783 | struct se_dev_attrib, da_group); | |
1784 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1785 | struct tcmu_dev, se_dev); | |
1786 | u32 val; | |
1787 | int ret; | |
1788 | ||
1789 | if (da->da_dev->export_count) { | |
1790 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1791 | return -EINVAL; | |
1792 | } | |
1793 | ||
1794 | ret = kstrtou32(page, 0, &val); | |
1795 | if (ret < 0) | |
1796 | return ret; | |
1797 | ||
7d7a7435 NB |
1798 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1799 | return count; | |
1800 | } | |
1801 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1802 | ||
2d76443e | 1803 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
1804 | { |
1805 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1806 | struct se_dev_attrib, da_group); | |
1807 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1808 | ||
1809 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
1810 | } | |
1811 | ||
2d76443e MC |
1812 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
1813 | size_t count) | |
ee018252 BL |
1814 | { |
1815 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1816 | struct se_dev_attrib, da_group); | |
1817 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1818 | int ret, len; |
ee018252 | 1819 | |
2d76443e MC |
1820 | len = strlen(page); |
1821 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 1822 | return -EINVAL; |
ee018252 BL |
1823 | |
1824 | /* Check if device has been configured before */ | |
1825 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1826 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1827 | TCMU_ATTR_DEV_CFG, page); |
ee018252 BL |
1828 | if (ret) { |
1829 | pr_err("Unable to reconfigure device\n"); | |
1830 | return ret; | |
1831 | } | |
de8c5221 BL |
1832 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
1833 | ||
1834 | ret = tcmu_update_uio_info(udev); | |
1835 | if (ret) | |
1836 | return ret; | |
1837 | return count; | |
ee018252 | 1838 | } |
2d76443e | 1839 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
1840 | |
1841 | return count; | |
1842 | } | |
2d76443e | 1843 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 1844 | |
801fc54d BL |
1845 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
1846 | { | |
1847 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1848 | struct se_dev_attrib, da_group); | |
1849 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1850 | ||
1851 | return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); | |
1852 | } | |
1853 | ||
1854 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, | |
1855 | size_t count) | |
1856 | { | |
1857 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1858 | struct se_dev_attrib, da_group); | |
1859 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1860 | u64 val; |
801fc54d BL |
1861 | int ret; |
1862 | ||
2d76443e | 1863 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
1864 | if (ret < 0) |
1865 | return ret; | |
801fc54d BL |
1866 | |
1867 | /* Check if device has been configured before */ | |
1868 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1869 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1870 | TCMU_ATTR_DEV_SIZE, &val); |
801fc54d BL |
1871 | if (ret) { |
1872 | pr_err("Unable to reconfigure device\n"); | |
1873 | return ret; | |
1874 | } | |
1875 | } | |
2d76443e | 1876 | udev->dev_size = val; |
801fc54d BL |
1877 | return count; |
1878 | } | |
1879 | CONFIGFS_ATTR(tcmu_, dev_size); | |
1880 | ||
b849b456 KN |
1881 | static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
1882 | char *page) | |
1883 | { | |
1884 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1885 | struct se_dev_attrib, da_group); | |
1886 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1887 | ||
1888 | return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); | |
1889 | } | |
1890 | ||
1891 | static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, | |
1892 | const char *page, size_t count) | |
1893 | { | |
1894 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1895 | struct se_dev_attrib, da_group); | |
1896 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1897 | s8 val; | |
1898 | int ret; | |
1899 | ||
1900 | ret = kstrtos8(page, 0, &val); | |
1901 | if (ret < 0) | |
1902 | return ret; | |
1903 | ||
1904 | udev->nl_reply_supported = val; | |
1905 | return count; | |
1906 | } | |
1907 | CONFIGFS_ATTR(tcmu_, nl_reply_supported); | |
1908 | ||
9a8bb606 BL |
1909 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
1910 | char *page) | |
1911 | { | |
1912 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1913 | struct se_dev_attrib, da_group); | |
1914 | ||
1915 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
1916 | } | |
1917 | ||
1918 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, | |
1919 | const char *page, size_t count) | |
1920 | { | |
1921 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1922 | struct se_dev_attrib, da_group); | |
1068be7b | 1923 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 1924 | u8 val; |
9a8bb606 BL |
1925 | int ret; |
1926 | ||
2d76443e | 1927 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
1928 | if (ret < 0) |
1929 | return ret; | |
1930 | ||
1068be7b BL |
1931 | /* Check if device has been configured before */ |
1932 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1933 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1934 | TCMU_ATTR_WRITECACHE, &val); |
1068be7b BL |
1935 | if (ret) { |
1936 | pr_err("Unable to reconfigure device\n"); | |
1937 | return ret; | |
1938 | } | |
1939 | } | |
2d76443e MC |
1940 | |
1941 | da->emulate_write_cache = val; | |
9a8bb606 BL |
1942 | return count; |
1943 | } | |
1944 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
1945 | ||
5821783b | 1946 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 1947 | &tcmu_attr_cmd_time_out, |
2d76443e | 1948 | &tcmu_attr_dev_config, |
801fc54d BL |
1949 | &tcmu_attr_dev_size, |
1950 | &tcmu_attr_emulate_write_cache, | |
b849b456 | 1951 | &tcmu_attr_nl_reply_supported, |
801fc54d BL |
1952 | NULL, |
1953 | }; | |
1954 | ||
7d7a7435 NB |
1955 | static struct configfs_attribute **tcmu_attrs; |
1956 | ||
1957 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1958 | .name = "user", |
7c9e7a6f | 1959 | .owner = THIS_MODULE, |
a3541703 | 1960 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1961 | .attach_hba = tcmu_attach_hba, |
1962 | .detach_hba = tcmu_detach_hba, | |
1963 | .alloc_device = tcmu_alloc_device, | |
1964 | .configure_device = tcmu_configure_device, | |
92634706 | 1965 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
1966 | .free_device = tcmu_free_device, |
1967 | .parse_cdb = tcmu_parse_cdb, | |
1968 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1969 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1970 | .get_device_type = sbc_get_device_type, | |
1971 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1972 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1973 | }; |
1974 | ||
b6df4b79 XL |
1975 | static int unmap_thread_fn(void *data) |
1976 | { | |
1977 | struct tcmu_dev *udev; | |
1978 | loff_t off; | |
1979 | uint32_t start, end, block; | |
1980 | struct page *page; | |
1981 | int i; | |
1982 | ||
07932a02 | 1983 | while (!kthread_should_stop()) { |
b6df4b79 XL |
1984 | DEFINE_WAIT(__wait); |
1985 | ||
1986 | prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); | |
1987 | schedule(); | |
1988 | finish_wait(&unmap_wait, &__wait); | |
1989 | ||
d906d8af MC |
1990 | if (kthread_should_stop()) |
1991 | break; | |
1992 | ||
b6df4b79 XL |
1993 | mutex_lock(&root_udev_mutex); |
1994 | list_for_each_entry(udev, &root_udev, node) { | |
1995 | mutex_lock(&udev->cmdr_lock); | |
1996 | ||
1997 | /* Try to complete the finished commands first */ | |
1998 | tcmu_handle_completions(udev); | |
1999 | ||
2000 | /* Skip the udevs waiting the global pool or in idle */ | |
2001 | if (udev->waiting_global || !udev->dbi_thresh) { | |
2002 | mutex_unlock(&udev->cmdr_lock); | |
2003 | continue; | |
2004 | } | |
2005 | ||
2006 | end = udev->dbi_max + 1; | |
2007 | block = find_last_bit(udev->data_bitmap, end); | |
2008 | if (block == udev->dbi_max) { | |
2009 | /* | |
2010 | * The last bit is dbi_max, so there is | |
2011 | * no need to shrink any blocks. | |
2012 | */ | |
2013 | mutex_unlock(&udev->cmdr_lock); | |
2014 | continue; | |
2015 | } else if (block == end) { | |
2016 | /* The current udev will goto idle state */ | |
2017 | udev->dbi_thresh = start = 0; | |
2018 | udev->dbi_max = 0; | |
2019 | } else { | |
2020 | udev->dbi_thresh = start = block + 1; | |
2021 | udev->dbi_max = block; | |
2022 | } | |
2023 | ||
2024 | /* Here will truncate the data area from off */ | |
2025 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
2026 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
2027 | ||
2028 | /* Release the block pages */ | |
2029 | for (i = start; i < end; i++) { | |
2030 | page = radix_tree_delete(&udev->data_blocks, i); | |
2031 | if (page) { | |
2032 | __free_page(page); | |
2033 | atomic_dec(&global_db_count); | |
2034 | } | |
2035 | } | |
2036 | mutex_unlock(&udev->cmdr_lock); | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Try to wake up the udevs who are waiting | |
2041 | * for the global data pool. | |
2042 | */ | |
2043 | list_for_each_entry(udev, &root_udev, node) { | |
2044 | if (udev->waiting_global) | |
2045 | wake_up(&udev->wait_cmdr); | |
2046 | } | |
2047 | mutex_unlock(&root_udev_mutex); | |
2048 | } | |
2049 | ||
2050 | return 0; | |
2051 | } | |
2052 | ||
7c9e7a6f AG |
2053 | static int __init tcmu_module_init(void) |
2054 | { | |
801fc54d | 2055 | int ret, i, k, len = 0; |
7c9e7a6f AG |
2056 | |
2057 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
2058 | ||
2059 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
2060 | sizeof(struct tcmu_cmd), | |
2061 | __alignof__(struct tcmu_cmd), | |
2062 | 0, NULL); | |
2063 | if (!tcmu_cmd_cache) | |
2064 | return -ENOMEM; | |
2065 | ||
2066 | tcmu_root_device = root_device_register("tcm_user"); | |
2067 | if (IS_ERR(tcmu_root_device)) { | |
2068 | ret = PTR_ERR(tcmu_root_device); | |
2069 | goto out_free_cache; | |
2070 | } | |
2071 | ||
2072 | ret = genl_register_family(&tcmu_genl_family); | |
2073 | if (ret < 0) { | |
2074 | goto out_unreg_device; | |
2075 | } | |
2076 | ||
7d7a7435 NB |
2077 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
2078 | len += sizeof(struct configfs_attribute *); | |
2079 | } | |
801fc54d BL |
2080 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { |
2081 | len += sizeof(struct configfs_attribute *); | |
2082 | } | |
2083 | len += sizeof(struct configfs_attribute *); | |
7d7a7435 NB |
2084 | |
2085 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
2086 | if (!tcmu_attrs) { | |
2087 | ret = -ENOMEM; | |
2088 | goto out_unreg_genl; | |
2089 | } | |
2090 | ||
2091 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
2092 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
2093 | } | |
801fc54d BL |
2094 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { |
2095 | tcmu_attrs[i] = tcmu_attrib_attrs[k]; | |
2096 | i++; | |
2097 | } | |
7d7a7435 NB |
2098 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
2099 | ||
0a06d430 | 2100 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 2101 | if (ret) |
7d7a7435 | 2102 | goto out_attrs; |
7c9e7a6f | 2103 | |
b6df4b79 XL |
2104 | init_waitqueue_head(&unmap_wait); |
2105 | unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); | |
2106 | if (IS_ERR(unmap_thread)) { | |
2107 | ret = PTR_ERR(unmap_thread); | |
2108 | goto out_unreg_transport; | |
2109 | } | |
2110 | ||
7c9e7a6f AG |
2111 | return 0; |
2112 | ||
b6df4b79 XL |
2113 | out_unreg_transport: |
2114 | target_backend_unregister(&tcmu_ops); | |
7d7a7435 NB |
2115 | out_attrs: |
2116 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
2117 | out_unreg_genl: |
2118 | genl_unregister_family(&tcmu_genl_family); | |
2119 | out_unreg_device: | |
2120 | root_device_unregister(tcmu_root_device); | |
2121 | out_free_cache: | |
2122 | kmem_cache_destroy(tcmu_cmd_cache); | |
2123 | ||
2124 | return ret; | |
2125 | } | |
2126 | ||
2127 | static void __exit tcmu_module_exit(void) | |
2128 | { | |
b6df4b79 | 2129 | kthread_stop(unmap_thread); |
0a06d430 | 2130 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 2131 | kfree(tcmu_attrs); |
7c9e7a6f AG |
2132 | genl_unregister_family(&tcmu_genl_family); |
2133 | root_device_unregister(tcmu_root_device); | |
2134 | kmem_cache_destroy(tcmu_cmd_cache); | |
2135 | } | |
2136 | ||
2137 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
2138 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
2139 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
2140 | MODULE_LICENSE("GPL"); | |
2141 | ||
2142 | module_init(tcmu_module_init); | |
2143 | module_exit(tcmu_module_exit); |