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7c9e7a6f AG |
1 | /* |
2 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
3 | * Copyright (C) 2014 Red Hat, Inc. | |
f97ec7db | 4 | * Copyright (C) 2015 Arrikto, Inc. |
141685a3 | 5 | * Copyright (C) 2017 Chinamobile, Inc. |
7c9e7a6f AG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/spinlock.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/idr.h> | |
ba929992 | 24 | #include <linux/kernel.h> |
7c9e7a6f AG |
25 | #include <linux/timer.h> |
26 | #include <linux/parser.h> | |
5538d294 | 27 | #include <linux/vmalloc.h> |
7c9e7a6f | 28 | #include <linux/uio_driver.h> |
141685a3 | 29 | #include <linux/radix-tree.h> |
ac64a2ce | 30 | #include <linux/stringify.h> |
26418649 | 31 | #include <linux/bitops.h> |
f5045724 | 32 | #include <linux/highmem.h> |
7d7a7435 | 33 | #include <linux/configfs.h> |
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 AG |
152 | char dev_config[TCMU_CONFIG_LEN]; |
153 | }; | |
154 | ||
155 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
156 | ||
157 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
158 | ||
159 | struct tcmu_cmd { | |
160 | struct se_cmd *se_cmd; | |
161 | struct tcmu_dev *tcmu_dev; | |
162 | ||
163 | uint16_t cmd_id; | |
164 | ||
26418649 | 165 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 166 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
167 | uint32_t dbi_cnt; |
168 | uint32_t dbi_cur; | |
169 | uint32_t *dbi; | |
7c9e7a6f AG |
170 | |
171 | unsigned long deadline; | |
172 | ||
173 | #define TCMU_CMD_BIT_EXPIRED 0 | |
174 | unsigned long flags; | |
175 | }; | |
176 | ||
b6df4b79 XL |
177 | static struct task_struct *unmap_thread; |
178 | static wait_queue_head_t unmap_wait; | |
179 | static DEFINE_MUTEX(root_udev_mutex); | |
180 | static LIST_HEAD(root_udev); | |
181 | ||
182 | static atomic_t global_db_count = ATOMIC_INIT(0); | |
183 | ||
7c9e7a6f AG |
184 | static struct kmem_cache *tcmu_cmd_cache; |
185 | ||
186 | /* multicast group */ | |
187 | enum tcmu_multicast_groups { | |
188 | TCMU_MCGRP_CONFIG, | |
189 | }; | |
190 | ||
191 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
192 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
193 | }; | |
194 | ||
b3af66e2 MC |
195 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
196 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
197 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
198 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
199 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
200 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
201 | }; | |
202 | ||
203 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
204 | { | |
205 | struct se_device *dev; | |
206 | struct tcmu_dev *udev; | |
207 | struct tcmu_nl_cmd *nl_cmd; | |
208 | int dev_id, rc, ret = 0; | |
209 | bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); | |
210 | ||
211 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
212 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
213 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
218 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
219 | ||
220 | dev = target_find_device(dev_id, !is_removed); | |
221 | if (!dev) { | |
222 | printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", | |
223 | completed_cmd, rc, dev_id); | |
224 | return -ENODEV; | |
225 | } | |
226 | udev = TCMU_DEV(dev); | |
227 | ||
228 | spin_lock(&udev->nl_cmd_lock); | |
229 | nl_cmd = &udev->curr_nl_cmd; | |
230 | ||
231 | pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, | |
232 | nl_cmd->cmd, completed_cmd, rc); | |
233 | ||
234 | if (nl_cmd->cmd != completed_cmd) { | |
235 | printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", | |
236 | completed_cmd, nl_cmd->cmd); | |
237 | ret = -EINVAL; | |
238 | } else { | |
239 | nl_cmd->status = rc; | |
240 | } | |
241 | ||
242 | spin_unlock(&udev->nl_cmd_lock); | |
243 | if (!is_removed) | |
244 | target_undepend_item(&dev->dev_group.cg_item); | |
245 | if (!ret) | |
246 | complete(&nl_cmd->complete); | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
251 | { | |
252 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
253 | } | |
254 | ||
255 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
256 | { | |
257 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
258 | } | |
259 | ||
260 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
261 | struct genl_info *info) | |
262 | { | |
263 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
264 | } | |
265 | ||
266 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
267 | { | |
268 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
269 | tcmu_kern_cmd_reply_supported = | |
270 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
271 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
272 | tcmu_kern_cmd_reply_supported); | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static const struct genl_ops tcmu_genl_ops[] = { | |
279 | { | |
280 | .cmd = TCMU_CMD_SET_FEATURES, | |
281 | .flags = GENL_ADMIN_PERM, | |
282 | .policy = tcmu_attr_policy, | |
283 | .doit = tcmu_genl_set_features, | |
284 | }, | |
285 | { | |
286 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
287 | .flags = GENL_ADMIN_PERM, | |
288 | .policy = tcmu_attr_policy, | |
289 | .doit = tcmu_genl_add_dev_done, | |
290 | }, | |
291 | { | |
292 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
293 | .flags = GENL_ADMIN_PERM, | |
294 | .policy = tcmu_attr_policy, | |
295 | .doit = tcmu_genl_rm_dev_done, | |
296 | }, | |
297 | { | |
298 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
299 | .flags = GENL_ADMIN_PERM, | |
300 | .policy = tcmu_attr_policy, | |
301 | .doit = tcmu_genl_reconfig_dev_done, | |
302 | }, | |
303 | }; | |
304 | ||
7c9e7a6f | 305 | /* Our generic netlink family */ |
56989f6d | 306 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 307 | .module = THIS_MODULE, |
7c9e7a6f AG |
308 | .hdrsize = 0, |
309 | .name = "TCM-USER", | |
b3af66e2 | 310 | .version = 2, |
7c9e7a6f AG |
311 | .maxattr = TCMU_ATTR_MAX, |
312 | .mcgrps = tcmu_mcgrps, | |
313 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 314 | .netnsok = true, |
b3af66e2 MC |
315 | .ops = tcmu_genl_ops, |
316 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
317 | }; |
318 | ||
141685a3 XL |
319 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
320 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
321 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
322 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
323 | ||
b6df4b79 | 324 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
325 | { |
326 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
327 | uint32_t i; | |
328 | ||
b6df4b79 | 329 | for (i = 0; i < len; i++) |
141685a3 XL |
330 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
331 | } | |
332 | ||
b6df4b79 XL |
333 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
334 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 335 | { |
b6df4b79 XL |
336 | struct page *page; |
337 | int ret, dbi; | |
141685a3 | 338 | |
b6df4b79 XL |
339 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
340 | if (dbi == udev->dbi_thresh) | |
341 | return false; | |
141685a3 | 342 | |
b6df4b79 XL |
343 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
344 | if (!page) { | |
b6df4b79 XL |
345 | if (atomic_add_return(1, &global_db_count) > |
346 | TCMU_GLOBAL_MAX_BLOCKS) { | |
347 | atomic_dec(&global_db_count); | |
348 | return false; | |
141685a3 XL |
349 | } |
350 | ||
b6df4b79 XL |
351 | /* try to get new page from the mm */ |
352 | page = alloc_page(GFP_KERNEL); | |
353 | if (!page) | |
daf78c30 | 354 | goto err_alloc; |
b6df4b79 XL |
355 | |
356 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
daf78c30 XL |
357 | if (ret) |
358 | goto err_insert; | |
141685a3 XL |
359 | } |
360 | ||
b6df4b79 XL |
361 | if (dbi > udev->dbi_max) |
362 | udev->dbi_max = dbi; | |
363 | ||
364 | set_bit(dbi, udev->data_bitmap); | |
365 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
366 | ||
367 | return true; | |
daf78c30 XL |
368 | err_insert: |
369 | __free_page(page); | |
370 | err_alloc: | |
371 | atomic_dec(&global_db_count); | |
372 | return false; | |
141685a3 XL |
373 | } |
374 | ||
b6df4b79 XL |
375 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
376 | struct tcmu_cmd *tcmu_cmd) | |
377 | { | |
378 | int i; | |
379 | ||
380 | udev->waiting_global = false; | |
381 | ||
382 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { | |
383 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
384 | goto err; | |
385 | } | |
386 | return true; | |
387 | ||
388 | err: | |
389 | udev->waiting_global = true; | |
390 | /* Try to wake up the unmap thread */ | |
391 | wake_up(&unmap_wait); | |
392 | return false; | |
393 | } | |
394 | ||
395 | static inline struct page * | |
396 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
397 | { |
398 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
399 | } | |
400 | ||
401 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
402 | { | |
403 | kfree(tcmu_cmd->dbi); | |
404 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
405 | } | |
406 | ||
407 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
408 | { | |
409 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
410 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
411 | ||
412 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
413 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
414 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
415 | DATA_BLOCK_SIZE); | |
416 | } | |
417 | ||
418 | return data_length; | |
419 | } | |
420 | ||
421 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
422 | { | |
423 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
424 | ||
425 | return data_length / DATA_BLOCK_SIZE; | |
426 | } | |
427 | ||
7c9e7a6f AG |
428 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
429 | { | |
430 | struct se_device *se_dev = se_cmd->se_dev; | |
431 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
432 | struct tcmu_cmd *tcmu_cmd; | |
433 | int cmd_id; | |
434 | ||
435 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
436 | if (!tcmu_cmd) | |
437 | return NULL; | |
438 | ||
439 | tcmu_cmd->se_cmd = se_cmd; | |
440 | tcmu_cmd->tcmu_dev = udev; | |
af980e46 MC |
441 | if (udev->cmd_time_out) |
442 | tcmu_cmd->deadline = jiffies + | |
443 | msecs_to_jiffies(udev->cmd_time_out); | |
7c9e7a6f | 444 | |
141685a3 XL |
445 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
446 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
447 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
448 | GFP_KERNEL); | |
449 | if (!tcmu_cmd->dbi) { | |
450 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
451 | return NULL; | |
452 | } | |
453 | ||
7c9e7a6f AG |
454 | idr_preload(GFP_KERNEL); |
455 | spin_lock_irq(&udev->commands_lock); | |
456 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
457 | USHRT_MAX, GFP_NOWAIT); | |
458 | spin_unlock_irq(&udev->commands_lock); | |
459 | idr_preload_end(); | |
460 | ||
461 | if (cmd_id < 0) { | |
141685a3 | 462 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
463 | return NULL; |
464 | } | |
465 | tcmu_cmd->cmd_id = cmd_id; | |
466 | ||
467 | return tcmu_cmd; | |
468 | } | |
469 | ||
470 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
471 | { | |
b75d8063 | 472 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
473 | |
474 | size = round_up(size+offset, PAGE_SIZE); | |
475 | vaddr -= offset; | |
476 | ||
477 | while (size) { | |
478 | flush_dcache_page(virt_to_page(vaddr)); | |
479 | size -= PAGE_SIZE; | |
480 | } | |
481 | } | |
482 | ||
483 | /* | |
484 | * Some ring helper functions. We don't assume size is a power of 2 so | |
485 | * we can't use circ_buf.h. | |
486 | */ | |
487 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
488 | { | |
489 | int diff = head - tail; | |
490 | ||
491 | if (diff >= 0) | |
492 | return diff; | |
493 | else | |
494 | return size + diff; | |
495 | } | |
496 | ||
497 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
498 | { | |
499 | /* Keep 1 byte unused or we can't tell full from empty */ | |
500 | return (size - spc_used(head, tail, size) - 1); | |
501 | } | |
502 | ||
503 | static inline size_t head_to_end(size_t head, size_t size) | |
504 | { | |
505 | return size - head; | |
506 | } | |
507 | ||
f1dbd087 SY |
508 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
509 | struct tcmu_dev *udev) | |
510 | { | |
511 | struct iovec *iovec; | |
512 | ||
513 | if (*iov_cnt != 0) | |
514 | (*iov)++; | |
515 | (*iov_cnt)++; | |
516 | ||
517 | iovec = *iov; | |
518 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
519 | } |
520 | ||
7c9e7a6f AG |
521 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
522 | ||
26418649 | 523 | /* offset is relative to mb_addr */ |
141685a3 XL |
524 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
525 | int dbi, int remaining) | |
26418649 | 526 | { |
141685a3 | 527 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
528 | DATA_BLOCK_SIZE - remaining; |
529 | } | |
530 | ||
daf78c30 | 531 | static inline size_t iov_tail(struct iovec *iov) |
26418649 SY |
532 | { |
533 | return (size_t)iov->iov_base + iov->iov_len; | |
534 | } | |
535 | ||
b6df4b79 | 536 | static int scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
537 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
538 | unsigned int data_nents, struct iovec **iov, | |
539 | int *iov_cnt, bool copy_data) | |
f97ec7db | 540 | { |
141685a3 | 541 | int i, dbi; |
26418649 | 542 | int block_remaining = 0; |
141685a3 XL |
543 | void *from, *to = NULL; |
544 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 545 | struct scatterlist *sg; |
b6df4b79 | 546 | struct page *page; |
f97ec7db IT |
547 | |
548 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 549 | int sg_remaining = sg->length; |
f97ec7db | 550 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
551 | while (sg_remaining > 0) { |
552 | if (block_remaining == 0) { | |
b6df4b79 XL |
553 | if (to) |
554 | kunmap_atomic(to); | |
555 | ||
26418649 | 556 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
557 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
558 | page = tcmu_get_block_page(udev, dbi); | |
559 | to = kmap_atomic(page); | |
26418649 | 560 | } |
141685a3 | 561 | |
26418649 SY |
562 | copy_bytes = min_t(size_t, sg_remaining, |
563 | block_remaining); | |
141685a3 | 564 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 565 | block_remaining); |
141685a3 | 566 | offset = DATA_BLOCK_SIZE - block_remaining; |
b3743c71 | 567 | to += offset; |
141685a3 | 568 | |
26418649 | 569 | if (*iov_cnt != 0 && |
daf78c30 | 570 | to_offset == iov_tail(*iov)) { |
26418649 SY |
571 | (*iov)->iov_len += copy_bytes; |
572 | } else { | |
573 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 574 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
575 | (*iov)->iov_len = copy_bytes; |
576 | } | |
f97ec7db | 577 | if (copy_data) { |
26418649 SY |
578 | memcpy(to, from + sg->length - sg_remaining, |
579 | copy_bytes); | |
f97ec7db IT |
580 | tcmu_flush_dcache_range(to, copy_bytes); |
581 | } | |
26418649 SY |
582 | sg_remaining -= copy_bytes; |
583 | block_remaining -= copy_bytes; | |
f97ec7db | 584 | } |
e2e21bd8 | 585 | kunmap_atomic(from - sg->offset); |
f97ec7db | 586 | } |
b6df4b79 XL |
587 | if (to) |
588 | kunmap_atomic(to); | |
f97ec7db | 589 | |
141685a3 | 590 | return 0; |
0c28481f SY |
591 | } |
592 | ||
a5d68ba8 XL |
593 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
594 | bool bidi) | |
f97ec7db | 595 | { |
a5d68ba8 | 596 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 597 | int i, dbi; |
26418649 | 598 | int block_remaining = 0; |
b6df4b79 | 599 | void *from = NULL, *to; |
141685a3 | 600 | size_t copy_bytes, offset; |
a5d68ba8 | 601 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 602 | struct page *page; |
a5d68ba8 | 603 | unsigned int data_nents; |
141685a3 | 604 | uint32_t count = 0; |
a5d68ba8 XL |
605 | |
606 | if (!bidi) { | |
607 | data_sg = se_cmd->t_data_sg; | |
608 | data_nents = se_cmd->t_data_nents; | |
609 | } else { | |
a5d68ba8 XL |
610 | |
611 | /* | |
612 | * For bidi case, the first count blocks are for Data-Out | |
613 | * buffer blocks, and before gathering the Data-In buffer | |
614 | * the Data-Out buffer blocks should be discarded. | |
615 | */ | |
616 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
617 | |
618 | data_sg = se_cmd->t_bidi_data_sg; | |
619 | data_nents = se_cmd->t_bidi_data_nents; | |
620 | } | |
f97ec7db | 621 | |
141685a3 XL |
622 | tcmu_cmd_set_dbi_cur(cmd, count); |
623 | ||
f97ec7db | 624 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 625 | int sg_remaining = sg->length; |
f97ec7db | 626 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
627 | while (sg_remaining > 0) { |
628 | if (block_remaining == 0) { | |
b6df4b79 XL |
629 | if (from) |
630 | kunmap_atomic(from); | |
631 | ||
26418649 | 632 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 633 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
634 | page = tcmu_get_block_page(udev, dbi); |
635 | from = kmap_atomic(page); | |
26418649 SY |
636 | } |
637 | copy_bytes = min_t(size_t, sg_remaining, | |
638 | block_remaining); | |
141685a3 | 639 | offset = DATA_BLOCK_SIZE - block_remaining; |
b3743c71 | 640 | from += offset; |
f97ec7db | 641 | tcmu_flush_dcache_range(from, copy_bytes); |
26418649 SY |
642 | memcpy(to + sg->length - sg_remaining, from, |
643 | copy_bytes); | |
f97ec7db | 644 | |
26418649 SY |
645 | sg_remaining -= copy_bytes; |
646 | block_remaining -= copy_bytes; | |
f97ec7db | 647 | } |
e2e21bd8 | 648 | kunmap_atomic(to - sg->offset); |
f97ec7db | 649 | } |
b6df4b79 XL |
650 | if (from) |
651 | kunmap_atomic(from); | |
f97ec7db IT |
652 | } |
653 | ||
b6df4b79 | 654 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 655 | { |
b6df4b79 | 656 | return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); |
26418649 SY |
657 | } |
658 | ||
7c9e7a6f | 659 | /* |
f97ec7db | 660 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 661 | * space available on the data area. |
7c9e7a6f AG |
662 | * |
663 | * Called with ring lock held. | |
664 | */ | |
b6df4b79 XL |
665 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
666 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
667 | { |
668 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
669 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
670 | / DATA_BLOCK_SIZE; | |
0241fd39 | 671 | size_t space, cmd_needed; |
7c9e7a6f AG |
672 | u32 cmd_head; |
673 | ||
674 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
675 | ||
676 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
677 | ||
f56574a2 AG |
678 | /* |
679 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
680 | * original cmd - cmds are internally contiguous. | |
681 | */ | |
682 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
683 | cmd_needed = cmd_size; | |
684 | else | |
685 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
686 | ||
7c9e7a6f AG |
687 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
688 | if (space < cmd_needed) { | |
689 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
690 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
691 | return false; | |
692 | } | |
693 | ||
b6df4b79 XL |
694 | /* try to check and get the data blocks as needed */ |
695 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
7c9e7a6f | 696 | if (space < data_needed) { |
b6df4b79 XL |
697 | unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; |
698 | unsigned long grow; | |
699 | ||
700 | if (blocks_left < blocks_needed) { | |
701 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
702 | blocks_left * DATA_BLOCK_SIZE, | |
703 | data_needed); | |
704 | return false; | |
705 | } | |
706 | ||
707 | /* Try to expand the thresh */ | |
708 | if (!udev->dbi_thresh) { | |
709 | /* From idle state */ | |
710 | uint32_t init_thresh = DATA_BLOCK_INIT_BITS; | |
711 | ||
712 | udev->dbi_thresh = max(blocks_needed, init_thresh); | |
713 | } else { | |
714 | /* | |
715 | * Grow the data area by max(blocks needed, | |
716 | * dbi_thresh / 2), but limited to the max | |
717 | * DATA_BLOCK_BITS size. | |
718 | */ | |
719 | grow = max(blocks_needed, udev->dbi_thresh / 2); | |
720 | udev->dbi_thresh += grow; | |
721 | if (udev->dbi_thresh > DATA_BLOCK_BITS) | |
722 | udev->dbi_thresh = DATA_BLOCK_BITS; | |
723 | } | |
7c9e7a6f AG |
724 | } |
725 | ||
daf78c30 | 726 | return tcmu_get_empty_blocks(udev, cmd); |
7c9e7a6f AG |
727 | } |
728 | ||
fe25cc34 XL |
729 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
730 | { | |
731 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
732 | sizeof(struct tcmu_cmd_entry)); | |
733 | } | |
734 | ||
735 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
736 | size_t base_command_size) | |
737 | { | |
738 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
739 | size_t command_size; | |
740 | ||
741 | command_size = base_command_size + | |
742 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
743 | TCMU_OP_ALIGN_SIZE); | |
744 | ||
745 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
746 | ||
747 | return command_size; | |
748 | } | |
749 | ||
02eb924f AG |
750 | static sense_reason_t |
751 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
752 | { |
753 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
754 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
755 | size_t base_command_size, command_size; | |
7c9e7a6f | 756 | struct tcmu_mailbox *mb; |
7c9e7a6f | 757 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 758 | struct iovec *iov; |
141685a3 | 759 | int iov_cnt, ret; |
7c9e7a6f AG |
760 | uint32_t cmd_head; |
761 | uint64_t cdb_off; | |
f97ec7db | 762 | bool copy_to_data_area; |
ab22d260 | 763 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
764 | |
765 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 766 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
767 | |
768 | /* | |
769 | * Must be a certain minimum size for response sense info, but | |
770 | * also may be larger if the iov array is large. | |
771 | * | |
fe25cc34 XL |
772 | * We prepare as many iovs as possbile for potential uses here, |
773 | * because it's expensive to tell how many regions are freed in | |
774 | * the bitmap & global data pool, as the size calculated here | |
775 | * will only be used to do the checks. | |
776 | * | |
777 | * The size will be recalculated later as actually needed to save | |
778 | * cmd area memories. | |
779 | */ | |
780 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
781 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 782 | |
b6df4b79 | 783 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
784 | |
785 | mb = udev->mb_addr; | |
786 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
787 | if ((command_size > (udev->cmdr_size / 2)) || |
788 | data_length > udev->data_size) { | |
789 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 790 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 791 | udev->cmdr_size, udev->data_size); |
b6df4b79 | 792 | mutex_unlock(&udev->cmdr_lock); |
554617b2 AG |
793 | return TCM_INVALID_CDB_FIELD; |
794 | } | |
7c9e7a6f | 795 | |
b6df4b79 | 796 | while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
7c9e7a6f AG |
797 | int ret; |
798 | DEFINE_WAIT(__wait); | |
799 | ||
800 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
801 | ||
802 | pr_debug("sleeping for ring space\n"); | |
b6df4b79 | 803 | mutex_unlock(&udev->cmdr_lock); |
af980e46 MC |
804 | if (udev->cmd_time_out) |
805 | ret = schedule_timeout( | |
806 | msecs_to_jiffies(udev->cmd_time_out)); | |
807 | else | |
808 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
809 | finish_wait(&udev->wait_cmdr, &__wait); |
810 | if (!ret) { | |
811 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 812 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
813 | } |
814 | ||
b6df4b79 | 815 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
816 | |
817 | /* We dropped cmdr_lock, cmd_head is stale */ | |
818 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
819 | } | |
820 | ||
f56574a2 AG |
821 | /* Insert a PAD if end-of-ring space is too small */ |
822 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
823 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
824 | ||
7c9e7a6f | 825 | entry = (void *) mb + CMDR_OFF + cmd_head; |
0ad46af8 AG |
826 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
827 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
828 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
829 | entry->hdr.kflags = 0; | |
830 | entry->hdr.uflags = 0; | |
9d62bc0e | 831 | tcmu_flush_dcache_range(entry, sizeof(*entry)); |
7c9e7a6f AG |
832 | |
833 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
9d62bc0e | 834 | tcmu_flush_dcache_range(mb, sizeof(*mb)); |
7c9e7a6f AG |
835 | |
836 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
837 | WARN_ON(cmd_head != 0); | |
838 | } | |
839 | ||
840 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
b3743c71 | 841 | memset(entry, 0, command_size); |
0ad46af8 | 842 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
0ad46af8 | 843 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; |
7c9e7a6f | 844 | |
3d9b9555 | 845 | /* Handle allocating space from the data area */ |
b6df4b79 | 846 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 847 | iov = &entry->req.iov[0]; |
f97ec7db | 848 | iov_cnt = 0; |
e4648b01 IT |
849 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
850 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
b6df4b79 XL |
851 | ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
852 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
853 | copy_to_data_area); | |
141685a3 | 854 | if (ret) { |
b6df4b79 XL |
855 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
856 | mutex_unlock(&udev->cmdr_lock); | |
857 | ||
141685a3 XL |
858 | pr_err("tcmu: alloc and scatter data failed\n"); |
859 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
860 | } | |
7c9e7a6f AG |
861 | entry->req.iov_cnt = iov_cnt; |
862 | ||
e4648b01 | 863 | /* Handle BIDI commands */ |
b3743c71 | 864 | iov_cnt = 0; |
ab22d260 | 865 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 866 | iov++; |
b6df4b79 | 867 | ret = scatter_data_area(udev, tcmu_cmd, |
141685a3 XL |
868 | se_cmd->t_bidi_data_sg, |
869 | se_cmd->t_bidi_data_nents, | |
870 | &iov, &iov_cnt, false); | |
871 | if (ret) { | |
b6df4b79 XL |
872 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
873 | mutex_unlock(&udev->cmdr_lock); | |
874 | ||
141685a3 XL |
875 | pr_err("tcmu: alloc and scatter bidi data failed\n"); |
876 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
877 | } | |
ab22d260 | 878 | } |
b3743c71 | 879 | entry->req.iov_bidi_cnt = iov_cnt; |
26418649 | 880 | |
fe25cc34 XL |
881 | /* |
882 | * Recalaulate the command's base size and size according | |
883 | * to the actual needs | |
884 | */ | |
885 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
886 | entry->req.iov_bidi_cnt); | |
887 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
888 | ||
889 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
890 | ||
7c9e7a6f AG |
891 | /* All offsets relative to mb_addr, not start of entry! */ |
892 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
893 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
894 | entry->req.cdb_off = cdb_off; | |
895 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
896 | ||
897 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
898 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
b6df4b79 | 899 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
900 | |
901 | /* TODO: only if FLUSH and FUA? */ | |
902 | uio_event_notify(&udev->uio_info); | |
903 | ||
af980e46 MC |
904 | if (udev->cmd_time_out) |
905 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
906 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 907 | |
02eb924f | 908 | return TCM_NO_SENSE; |
7c9e7a6f AG |
909 | } |
910 | ||
02eb924f AG |
911 | static sense_reason_t |
912 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f AG |
913 | { |
914 | struct se_device *se_dev = se_cmd->se_dev; | |
915 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
916 | struct tcmu_cmd *tcmu_cmd; | |
ecaf597b | 917 | sense_reason_t ret; |
7c9e7a6f AG |
918 | |
919 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
920 | if (!tcmu_cmd) | |
02eb924f | 921 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
922 | |
923 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 924 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f AG |
925 | pr_err("TCMU: Could not queue command\n"); |
926 | spin_lock_irq(&udev->commands_lock); | |
927 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
928 | spin_unlock_irq(&udev->commands_lock); | |
929 | ||
141685a3 | 930 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
931 | } |
932 | ||
933 | return ret; | |
934 | } | |
935 | ||
936 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
937 | { | |
938 | struct se_cmd *se_cmd = cmd->se_cmd; | |
939 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
940 | ||
141685a3 XL |
941 | /* |
942 | * cmd has been completed already from timeout, just reclaim | |
943 | * data area space and free cmd | |
944 | */ | |
945 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
946 | goto out; | |
b25c7863 | 947 | |
141685a3 | 948 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 949 | |
0ad46af8 | 950 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
951 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
952 | cmd->se_cmd); | |
ed97d0cd AG |
953 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
954 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 955 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
e4648b01 | 956 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 957 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 958 | gather_data_area(udev, cmd, true); |
e4648b01 | 959 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 960 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 961 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 962 | /* TODO: */ |
2bc396a2 IT |
963 | } else if (se_cmd->data_direction != DMA_NONE) { |
964 | pr_warn("TCMU: data direction was %d!\n", | |
965 | se_cmd->data_direction); | |
7c9e7a6f AG |
966 | } |
967 | ||
968 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 969 | |
141685a3 XL |
970 | out: |
971 | cmd->se_cmd = NULL; | |
b6df4b79 | 972 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 973 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
974 | } |
975 | ||
976 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
977 | { | |
978 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
979 | int handled = 0; |
980 | ||
981 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
982 | pr_err("ring broken, not handling completions\n"); | |
983 | return 0; | |
984 | } | |
985 | ||
7c9e7a6f AG |
986 | mb = udev->mb_addr; |
987 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
988 | ||
989 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
990 | ||
991 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
992 | struct tcmu_cmd *cmd; | |
993 | ||
994 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
995 | ||
0ad46af8 AG |
996 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
997 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
998 | tcmu_hdr_get_len(entry->hdr.len_op), | |
999 | udev->cmdr_size); | |
7c9e7a6f AG |
1000 | continue; |
1001 | } | |
0ad46af8 | 1002 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
1003 | |
1004 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 1005 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
1006 | spin_unlock(&udev->commands_lock); |
1007 | ||
1008 | if (!cmd) { | |
1009 | pr_err("cmd_id not found, ring is broken\n"); | |
1010 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | tcmu_handle_completion(cmd, entry); | |
1015 | ||
0ad46af8 AG |
1016 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1017 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1018 | udev->cmdr_size); | |
7c9e7a6f AG |
1019 | |
1020 | handled++; | |
1021 | } | |
1022 | ||
1023 | if (mb->cmd_tail == mb->cmd_head) | |
1024 | del_timer(&udev->timeout); /* no more pending cmds */ | |
1025 | ||
7c9e7a6f AG |
1026 | wake_up(&udev->wait_cmdr); |
1027 | ||
1028 | return handled; | |
1029 | } | |
1030 | ||
1031 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
1032 | { | |
1033 | struct tcmu_cmd *cmd = p; | |
1034 | ||
1035 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
1036 | return 0; | |
1037 | ||
611e2267 | 1038 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
1039 | return 0; |
1040 | ||
1041 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1042 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
1043 | cmd->se_cmd = NULL; | |
1044 | ||
7c9e7a6f AG |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | static void tcmu_device_timedout(unsigned long data) | |
1049 | { | |
1050 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
1051 | unsigned long flags; | |
7c9e7a6f AG |
1052 | |
1053 | spin_lock_irqsave(&udev->commands_lock, flags); | |
1054 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
1055 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
1056 | ||
b6df4b79 XL |
1057 | /* Try to wake up the ummap thread */ |
1058 | wake_up(&unmap_wait); | |
1059 | ||
7c9e7a6f AG |
1060 | /* |
1061 | * We don't need to wakeup threads on wait_cmdr since they have their | |
1062 | * own timeout. | |
1063 | */ | |
1064 | } | |
1065 | ||
1066 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
1067 | { | |
1068 | struct tcmu_hba *tcmu_hba; | |
1069 | ||
1070 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1071 | if (!tcmu_hba) | |
1072 | return -ENOMEM; | |
1073 | ||
1074 | tcmu_hba->host_id = host_id; | |
1075 | hba->hba_ptr = tcmu_hba; | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static void tcmu_detach_hba(struct se_hba *hba) | |
1081 | { | |
1082 | kfree(hba->hba_ptr); | |
1083 | hba->hba_ptr = NULL; | |
1084 | } | |
1085 | ||
1086 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1087 | { | |
1088 | struct tcmu_dev *udev; | |
1089 | ||
1090 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1091 | if (!udev) | |
1092 | return NULL; | |
f3cdbe39 | 1093 | kref_init(&udev->kref); |
7c9e7a6f AG |
1094 | |
1095 | udev->name = kstrdup(name, GFP_KERNEL); | |
1096 | if (!udev->name) { | |
1097 | kfree(udev); | |
1098 | return NULL; | |
1099 | } | |
1100 | ||
1101 | udev->hba = hba; | |
af980e46 | 1102 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
1103 | |
1104 | init_waitqueue_head(&udev->wait_cmdr); | |
b6df4b79 | 1105 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f AG |
1106 | |
1107 | idr_init(&udev->commands); | |
1108 | spin_lock_init(&udev->commands_lock); | |
1109 | ||
1110 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
1111 | (unsigned long)udev); | |
1112 | ||
b3af66e2 MC |
1113 | init_waitqueue_head(&udev->nl_cmd_wq); |
1114 | spin_lock_init(&udev->nl_cmd_lock); | |
1115 | ||
7c9e7a6f AG |
1116 | return &udev->se_dev; |
1117 | } | |
1118 | ||
1119 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
1120 | { | |
1121 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
1122 | ||
b6df4b79 | 1123 | mutex_lock(&tcmu_dev->cmdr_lock); |
7c9e7a6f | 1124 | tcmu_handle_completions(tcmu_dev); |
b6df4b79 | 1125 | mutex_unlock(&tcmu_dev->cmdr_lock); |
7c9e7a6f AG |
1126 | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1132 | * and this stuff must come along. | |
1133 | */ | |
1134 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1135 | { | |
1136 | struct tcmu_dev *udev = vma->vm_private_data; | |
1137 | struct uio_info *info = &udev->uio_info; | |
1138 | ||
1139 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1140 | if (info->mem[vma->vm_pgoff].size == 0) | |
1141 | return -1; | |
1142 | return (int)vma->vm_pgoff; | |
1143 | } | |
1144 | return -1; | |
1145 | } | |
1146 | ||
b6df4b79 XL |
1147 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1148 | { | |
1149 | struct page *page; | |
1150 | int ret; | |
1151 | ||
1152 | mutex_lock(&udev->cmdr_lock); | |
1153 | page = tcmu_get_block_page(udev, dbi); | |
1154 | if (likely(page)) { | |
1155 | mutex_unlock(&udev->cmdr_lock); | |
1156 | return page; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Normally it shouldn't be here: | |
1161 | * Only when the userspace has touched the blocks which | |
1162 | * are out of the tcmu_cmd's data iov[], and will return | |
1163 | * one zeroed page. | |
1164 | */ | |
1165 | pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); | |
1166 | pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); | |
1167 | ||
1168 | if (dbi >= udev->dbi_thresh) { | |
1169 | /* Extern the udev->dbi_thresh to dbi + 1 */ | |
1170 | udev->dbi_thresh = dbi + 1; | |
1171 | udev->dbi_max = dbi; | |
1172 | } | |
1173 | ||
1174 | page = radix_tree_lookup(&udev->data_blocks, dbi); | |
1175 | if (!page) { | |
1176 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1177 | if (!page) { | |
1178 | mutex_unlock(&udev->cmdr_lock); | |
1179 | return NULL; | |
1180 | } | |
1181 | ||
1182 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
1183 | if (ret) { | |
1184 | mutex_unlock(&udev->cmdr_lock); | |
1185 | __free_page(page); | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Since this case is rare in page fault routine, here we | |
1191 | * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS | |
1192 | * to reduce possible page fault call trace. | |
1193 | */ | |
1194 | atomic_inc(&global_db_count); | |
1195 | } | |
1196 | mutex_unlock(&udev->cmdr_lock); | |
1197 | ||
1198 | return page; | |
1199 | } | |
1200 | ||
11bac800 | 1201 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1202 | { |
11bac800 | 1203 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1204 | struct uio_info *info = &udev->uio_info; |
1205 | struct page *page; | |
1206 | unsigned long offset; | |
1207 | void *addr; | |
1208 | ||
11bac800 | 1209 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1210 | if (mi < 0) |
1211 | return VM_FAULT_SIGBUS; | |
1212 | ||
1213 | /* | |
1214 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1215 | * to use mem[N]. | |
1216 | */ | |
1217 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1218 | ||
141685a3 XL |
1219 | if (offset < udev->data_off) { |
1220 | /* For the vmalloc()ed cmd area pages */ | |
1221 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1222 | page = vmalloc_to_page(addr); |
141685a3 | 1223 | } else { |
141685a3 XL |
1224 | uint32_t dbi; |
1225 | ||
b6df4b79 | 1226 | /* For the dynamically growing data area pages */ |
141685a3 | 1227 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1228 | page = tcmu_try_get_block_page(udev, dbi); |
1229 | if (!page) | |
141685a3 | 1230 | return VM_FAULT_NOPAGE; |
141685a3 XL |
1231 | } |
1232 | ||
7c9e7a6f AG |
1233 | get_page(page); |
1234 | vmf->page = page; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1239 | .fault = tcmu_vma_fault, | |
1240 | }; | |
1241 | ||
1242 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1243 | { | |
1244 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1245 | ||
1246 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1247 | vma->vm_ops = &tcmu_vm_ops; | |
1248 | ||
1249 | vma->vm_private_data = udev; | |
1250 | ||
1251 | /* Ensure the mmap is exactly the right size */ | |
1252 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1253 | return -EINVAL; | |
1254 | ||
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1259 | { | |
1260 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1261 | ||
1262 | /* O_EXCL not supported for char devs, so fake it? */ | |
1263 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1264 | return -EBUSY; | |
1265 | ||
b6df4b79 | 1266 | udev->inode = inode; |
9260695d | 1267 | kref_get(&udev->kref); |
b6df4b79 | 1268 | |
7c9e7a6f AG |
1269 | pr_debug("open\n"); |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
f3cdbe39 MC |
1274 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1275 | { | |
1276 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1277 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1278 | ||
1279 | kfree(udev->uio_info.name); | |
1280 | kfree(udev->name); | |
1281 | kfree(udev); | |
1282 | } | |
1283 | ||
1284 | static void tcmu_dev_kref_release(struct kref *kref) | |
1285 | { | |
1286 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1287 | struct se_device *dev = &udev->se_dev; | |
1288 | ||
1289 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1290 | } | |
1291 | ||
7c9e7a6f AG |
1292 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1293 | { | |
1294 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1295 | ||
1296 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1297 | ||
1298 | pr_debug("close\n"); | |
9260695d | 1299 | /* release ref from open */ |
f3cdbe39 | 1300 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1301 | return 0; |
1302 | } | |
1303 | ||
b3af66e2 MC |
1304 | static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
1305 | { | |
1306 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1307 | ||
1308 | if (!tcmu_kern_cmd_reply_supported) | |
1309 | return; | |
1310 | relock: | |
1311 | spin_lock(&udev->nl_cmd_lock); | |
1312 | ||
1313 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
1314 | spin_unlock(&udev->nl_cmd_lock); | |
1315 | pr_debug("sleeping for open nl cmd\n"); | |
1316 | wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); | |
1317 | goto relock; | |
1318 | } | |
1319 | ||
1320 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1321 | nl_cmd->cmd = cmd; | |
1322 | init_completion(&nl_cmd->complete); | |
1323 | ||
1324 | spin_unlock(&udev->nl_cmd_lock); | |
1325 | } | |
1326 | ||
1327 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) | |
1328 | { | |
1329 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1330 | int ret; | |
1331 | DEFINE_WAIT(__wait); | |
1332 | ||
1333 | if (!tcmu_kern_cmd_reply_supported) | |
1334 | return 0; | |
1335 | ||
1336 | pr_debug("sleeping for nl reply\n"); | |
1337 | wait_for_completion(&nl_cmd->complete); | |
1338 | ||
1339 | spin_lock(&udev->nl_cmd_lock); | |
1340 | nl_cmd->cmd = TCMU_CMD_UNSPEC; | |
1341 | ret = nl_cmd->status; | |
1342 | nl_cmd->status = 0; | |
1343 | spin_unlock(&udev->nl_cmd_lock); | |
1344 | ||
1345 | wake_up_all(&udev->nl_cmd_wq); | |
1346 | ||
1347 | return ret;; | |
1348 | } | |
1349 | ||
1350 | static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, | |
1351 | int reconfig_attr, const void *reconfig_data) | |
7c9e7a6f AG |
1352 | { |
1353 | struct sk_buff *skb; | |
1354 | void *msg_header; | |
6e14eab9 | 1355 | int ret = -ENOMEM; |
7c9e7a6f AG |
1356 | |
1357 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1358 | if (!skb) | |
6e14eab9 | 1359 | return ret; |
7c9e7a6f AG |
1360 | |
1361 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1362 | if (!msg_header) |
1363 | goto free_skb; | |
7c9e7a6f | 1364 | |
b3af66e2 | 1365 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1366 | if (ret < 0) |
1367 | goto free_skb; | |
7c9e7a6f | 1368 | |
b3af66e2 MC |
1369 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1370 | if (ret < 0) | |
1371 | goto free_skb; | |
1372 | ||
1373 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1374 | if (ret < 0) |
1375 | goto free_skb; | |
7c9e7a6f | 1376 | |
2d76443e MC |
1377 | if (cmd == TCMU_CMD_RECONFIG_DEVICE) { |
1378 | switch (reconfig_attr) { | |
1379 | case TCMU_ATTR_DEV_CFG: | |
1380 | ret = nla_put_string(skb, reconfig_attr, reconfig_data); | |
1381 | break; | |
1382 | case TCMU_ATTR_DEV_SIZE: | |
1383 | ret = nla_put_u64_64bit(skb, reconfig_attr, | |
1384 | *((u64 *)reconfig_data), | |
1385 | TCMU_ATTR_PAD); | |
1386 | break; | |
1387 | case TCMU_ATTR_WRITECACHE: | |
1388 | ret = nla_put_u8(skb, reconfig_attr, | |
1389 | *((u8 *)reconfig_data)); | |
1390 | break; | |
1391 | default: | |
1392 | BUG(); | |
1393 | } | |
1394 | ||
1395 | if (ret < 0) | |
1396 | goto free_skb; | |
1397 | } | |
8a45885c | 1398 | |
053c095a | 1399 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1400 | |
b3af66e2 MC |
1401 | tcmu_init_genl_cmd_reply(udev, cmd); |
1402 | ||
20c08b36 | 1403 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f | 1404 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
7c9e7a6f AG |
1405 | /* We don't care if no one is listening */ |
1406 | if (ret == -ESRCH) | |
1407 | ret = 0; | |
b3af66e2 MC |
1408 | if (!ret) |
1409 | ret = tcmu_wait_genl_cmd_reply(udev); | |
7c9e7a6f AG |
1410 | |
1411 | return ret; | |
6e14eab9 NB |
1412 | free_skb: |
1413 | nlmsg_free(skb); | |
1414 | return ret; | |
7c9e7a6f AG |
1415 | } |
1416 | ||
de8c5221 | 1417 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 1418 | { |
7c9e7a6f AG |
1419 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
1420 | struct uio_info *info; | |
de8c5221 | 1421 | size_t size, used; |
7c9e7a6f AG |
1422 | char *str; |
1423 | ||
1424 | info = &udev->uio_info; | |
7c9e7a6f AG |
1425 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, |
1426 | udev->dev_config); | |
1427 | size += 1; /* for \0 */ | |
1428 | str = kmalloc(size, GFP_KERNEL); | |
1429 | if (!str) | |
1430 | return -ENOMEM; | |
1431 | ||
1432 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
7c9e7a6f AG |
1433 | if (udev->dev_config[0]) |
1434 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1435 | ||
1436 | info->name = str; | |
1437 | ||
de8c5221 BL |
1438 | return 0; |
1439 | } | |
1440 | ||
1441 | static int tcmu_configure_device(struct se_device *dev) | |
1442 | { | |
1443 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1444 | struct uio_info *info; | |
1445 | struct tcmu_mailbox *mb; | |
1446 | int ret = 0; | |
1447 | ||
1448 | ret = tcmu_update_uio_info(udev); | |
1449 | if (ret) | |
1450 | return ret; | |
1451 | ||
1452 | info = &udev->uio_info; | |
1453 | ||
141685a3 | 1454 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1455 | if (!udev->mb_addr) { |
1456 | ret = -ENOMEM; | |
1457 | goto err_vzalloc; | |
1458 | } | |
1459 | ||
1460 | /* mailbox fits in first part of CMDR space */ | |
1461 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1462 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1463 | udev->data_size = DATA_SIZE; |
b6df4b79 XL |
1464 | udev->dbi_thresh = 0; /* Default in Idle state */ |
1465 | udev->waiting_global = false; | |
7c9e7a6f | 1466 | |
141685a3 | 1467 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1468 | mb = udev->mb_addr; |
0ad46af8 | 1469 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1470 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1471 | mb->cmdr_off = CMDR_OFF; |
1472 | mb->cmdr_size = udev->cmdr_size; | |
1473 | ||
1474 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1475 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1476 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1477 | |
b6df4b79 | 1478 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
141685a3 | 1479 | |
ac64a2ce | 1480 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1481 | |
1482 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1483 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1484 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1485 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1486 | |
1487 | info->irqcontrol = tcmu_irqcontrol; | |
1488 | info->irq = UIO_IRQ_CUSTOM; | |
1489 | ||
1490 | info->mmap = tcmu_mmap; | |
1491 | info->open = tcmu_open; | |
1492 | info->release = tcmu_release; | |
1493 | ||
1494 | ret = uio_register_device(tcmu_root_device, info); | |
1495 | if (ret) | |
1496 | goto err_register; | |
1497 | ||
81ee28de SY |
1498 | /* User can set hw_block_size before enable the device */ |
1499 | if (dev->dev_attrib.hw_block_size == 0) | |
1500 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1501 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1502 | if (!dev->dev_attrib.hw_max_sectors) |
1503 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
1504 | if (!dev->dev_attrib.emulate_write_cache) |
1505 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
1506 | dev->dev_attrib.hw_queue_depth = 128; |
1507 | ||
f3cdbe39 MC |
1508 | /* |
1509 | * Get a ref incase userspace does a close on the uio device before | |
1510 | * LIO has initiated tcmu_free_device. | |
1511 | */ | |
1512 | kref_get(&udev->kref); | |
1513 | ||
b3af66e2 | 1514 | ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); |
7c9e7a6f AG |
1515 | if (ret) |
1516 | goto err_netlink; | |
1517 | ||
b6df4b79 XL |
1518 | mutex_lock(&root_udev_mutex); |
1519 | list_add(&udev->node, &root_udev); | |
1520 | mutex_unlock(&root_udev_mutex); | |
1521 | ||
7c9e7a6f AG |
1522 | return 0; |
1523 | ||
1524 | err_netlink: | |
f3cdbe39 | 1525 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1526 | uio_unregister_device(&udev->uio_info); |
1527 | err_register: | |
1528 | vfree(udev->mb_addr); | |
1529 | err_vzalloc: | |
1530 | kfree(info->name); | |
f3cdbe39 | 1531 | info->name = NULL; |
7c9e7a6f AG |
1532 | |
1533 | return ret; | |
1534 | } | |
1535 | ||
b25c7863 | 1536 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
7c9e7a6f | 1537 | { |
b25c7863 SY |
1538 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
1539 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
7c9e7a6f | 1540 | return 0; |
b25c7863 | 1541 | } |
7c9e7a6f AG |
1542 | return -EINVAL; |
1543 | } | |
1544 | ||
972c7f16 MC |
1545 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1546 | { | |
1547 | return udev->uio_info.uio_dev ? true : false; | |
1548 | } | |
1549 | ||
b6df4b79 XL |
1550 | static void tcmu_blocks_release(struct tcmu_dev *udev) |
1551 | { | |
1552 | int i; | |
1553 | struct page *page; | |
1554 | ||
1555 | /* Try to release all block pages */ | |
1556 | mutex_lock(&udev->cmdr_lock); | |
1557 | for (i = 0; i <= udev->dbi_max; i++) { | |
1558 | page = radix_tree_delete(&udev->data_blocks, i); | |
1559 | if (page) { | |
1560 | __free_page(page); | |
1561 | atomic_dec(&global_db_count); | |
1562 | } | |
1563 | } | |
1564 | mutex_unlock(&udev->cmdr_lock); | |
1565 | } | |
1566 | ||
7c9e7a6f | 1567 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
1568 | { |
1569 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1570 | ||
1571 | /* release ref from init */ | |
1572 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1573 | } | |
1574 | ||
1575 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
1576 | { |
1577 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
b25c7863 SY |
1578 | struct tcmu_cmd *cmd; |
1579 | bool all_expired = true; | |
7c9e7a6f AG |
1580 | int i; |
1581 | ||
1582 | del_timer_sync(&udev->timeout); | |
1583 | ||
b6df4b79 XL |
1584 | mutex_lock(&root_udev_mutex); |
1585 | list_del(&udev->node); | |
1586 | mutex_unlock(&root_udev_mutex); | |
1587 | ||
7c9e7a6f AG |
1588 | vfree(udev->mb_addr); |
1589 | ||
1590 | /* Upper layer should drain all requests before calling this */ | |
1591 | spin_lock_irq(&udev->commands_lock); | |
b25c7863 SY |
1592 | idr_for_each_entry(&udev->commands, cmd, i) { |
1593 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1594 | all_expired = false; | |
1595 | } | |
7c9e7a6f AG |
1596 | idr_destroy(&udev->commands); |
1597 | spin_unlock_irq(&udev->commands_lock); | |
b25c7863 | 1598 | WARN_ON(!all_expired); |
7c9e7a6f | 1599 | |
b6df4b79 | 1600 | tcmu_blocks_release(udev); |
141685a3 | 1601 | |
531283ff | 1602 | tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); |
7c9e7a6f | 1603 | |
531283ff | 1604 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
1605 | |
1606 | /* release ref from configure */ | |
1607 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
1608 | } |
1609 | ||
1610 | enum { | |
3abaa2bf | 1611 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
7d7a7435 | 1612 | Opt_err, |
7c9e7a6f AG |
1613 | }; |
1614 | ||
1615 | static match_table_t tokens = { | |
1616 | {Opt_dev_config, "dev_config=%s"}, | |
1617 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1618 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1619 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
7c9e7a6f AG |
1620 | {Opt_err, NULL} |
1621 | }; | |
1622 | ||
3abaa2bf MC |
1623 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1624 | { | |
1625 | unsigned long tmp_ul; | |
1626 | char *arg_p; | |
1627 | int ret; | |
1628 | ||
1629 | arg_p = match_strdup(arg); | |
1630 | if (!arg_p) | |
1631 | return -ENOMEM; | |
1632 | ||
1633 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1634 | kfree(arg_p); | |
1635 | if (ret < 0) { | |
1636 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1637 | return ret; | |
1638 | } | |
1639 | if (!tmp_ul) { | |
1640 | pr_err("dev attrib must be nonzero\n"); | |
1641 | return -EINVAL; | |
1642 | } | |
1643 | *dev_attrib = tmp_ul; | |
1644 | return 0; | |
1645 | } | |
1646 | ||
7c9e7a6f AG |
1647 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1648 | const char *page, ssize_t count) | |
1649 | { | |
1650 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1651 | char *orig, *ptr, *opts, *arg_p; | |
1652 | substring_t args[MAX_OPT_ARGS]; | |
1653 | int ret = 0, token; | |
7c9e7a6f AG |
1654 | |
1655 | opts = kstrdup(page, GFP_KERNEL); | |
1656 | if (!opts) | |
1657 | return -ENOMEM; | |
1658 | ||
1659 | orig = opts; | |
1660 | ||
1661 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1662 | if (!*ptr) | |
1663 | continue; | |
1664 | ||
1665 | token = match_token(ptr, tokens, args); | |
1666 | switch (token) { | |
1667 | case Opt_dev_config: | |
1668 | if (match_strlcpy(udev->dev_config, &args[0], | |
1669 | TCMU_CONFIG_LEN) == 0) { | |
1670 | ret = -EINVAL; | |
1671 | break; | |
1672 | } | |
1673 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1674 | break; | |
1675 | case Opt_dev_size: | |
1676 | arg_p = match_strdup(&args[0]); | |
1677 | if (!arg_p) { | |
1678 | ret = -ENOMEM; | |
1679 | break; | |
1680 | } | |
1681 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1682 | kfree(arg_p); | |
1683 | if (ret < 0) | |
1684 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1685 | break; | |
9c1cd1b6 | 1686 | case Opt_hw_block_size: |
3abaa2bf MC |
1687 | ret = tcmu_set_dev_attrib(&args[0], |
1688 | &(dev->dev_attrib.hw_block_size)); | |
1689 | break; | |
1690 | case Opt_hw_max_sectors: | |
1691 | ret = tcmu_set_dev_attrib(&args[0], | |
1692 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1693 | break; |
7c9e7a6f AG |
1694 | default: |
1695 | break; | |
1696 | } | |
2579325c MC |
1697 | |
1698 | if (ret) | |
1699 | break; | |
7c9e7a6f AG |
1700 | } |
1701 | ||
1702 | kfree(orig); | |
1703 | return (!ret) ? count : ret; | |
1704 | } | |
1705 | ||
1706 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1707 | { | |
1708 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1709 | ssize_t bl = 0; | |
1710 | ||
1711 | bl = sprintf(b + bl, "Config: %s ", | |
1712 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1713 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1714 | |
1715 | return bl; | |
1716 | } | |
1717 | ||
1718 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1719 | { | |
1720 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1721 | ||
1722 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1723 | dev->dev_attrib.block_size); | |
1724 | } | |
1725 | ||
7c9e7a6f | 1726 | static sense_reason_t |
9c1cd1b6 | 1727 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1728 | { |
02eb924f | 1729 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1730 | } |
1731 | ||
7d7a7435 NB |
1732 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1733 | { | |
1734 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1735 | struct se_dev_attrib, da_group); | |
1736 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1737 | struct tcmu_dev, se_dev); | |
1738 | ||
1739 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1740 | } | |
1741 | ||
1742 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1743 | size_t count) | |
1744 | { | |
1745 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1746 | struct se_dev_attrib, da_group); | |
1747 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1748 | struct tcmu_dev, se_dev); | |
1749 | u32 val; | |
1750 | int ret; | |
1751 | ||
1752 | if (da->da_dev->export_count) { | |
1753 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1754 | return -EINVAL; | |
1755 | } | |
1756 | ||
1757 | ret = kstrtou32(page, 0, &val); | |
1758 | if (ret < 0) | |
1759 | return ret; | |
1760 | ||
7d7a7435 NB |
1761 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1762 | return count; | |
1763 | } | |
1764 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1765 | ||
2d76443e | 1766 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
1767 | { |
1768 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1769 | struct se_dev_attrib, da_group); | |
1770 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1771 | ||
1772 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
1773 | } | |
1774 | ||
2d76443e MC |
1775 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
1776 | size_t count) | |
ee018252 BL |
1777 | { |
1778 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1779 | struct se_dev_attrib, da_group); | |
1780 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1781 | int ret, len; |
ee018252 | 1782 | |
2d76443e MC |
1783 | len = strlen(page); |
1784 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 1785 | return -EINVAL; |
ee018252 BL |
1786 | |
1787 | /* Check if device has been configured before */ | |
1788 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1789 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1790 | TCMU_ATTR_DEV_CFG, page); |
ee018252 BL |
1791 | if (ret) { |
1792 | pr_err("Unable to reconfigure device\n"); | |
1793 | return ret; | |
1794 | } | |
de8c5221 BL |
1795 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
1796 | ||
1797 | ret = tcmu_update_uio_info(udev); | |
1798 | if (ret) | |
1799 | return ret; | |
1800 | return count; | |
ee018252 | 1801 | } |
2d76443e | 1802 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
1803 | |
1804 | return count; | |
1805 | } | |
2d76443e | 1806 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 1807 | |
801fc54d BL |
1808 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
1809 | { | |
1810 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1811 | struct se_dev_attrib, da_group); | |
1812 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1813 | ||
1814 | return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); | |
1815 | } | |
1816 | ||
1817 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, | |
1818 | size_t count) | |
1819 | { | |
1820 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1821 | struct se_dev_attrib, da_group); | |
1822 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1823 | u64 val; |
801fc54d BL |
1824 | int ret; |
1825 | ||
2d76443e | 1826 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
1827 | if (ret < 0) |
1828 | return ret; | |
801fc54d BL |
1829 | |
1830 | /* Check if device has been configured before */ | |
1831 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1832 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1833 | TCMU_ATTR_DEV_SIZE, &val); |
801fc54d BL |
1834 | if (ret) { |
1835 | pr_err("Unable to reconfigure device\n"); | |
1836 | return ret; | |
1837 | } | |
1838 | } | |
2d76443e | 1839 | udev->dev_size = val; |
801fc54d BL |
1840 | return count; |
1841 | } | |
1842 | CONFIGFS_ATTR(tcmu_, dev_size); | |
1843 | ||
9a8bb606 BL |
1844 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
1845 | char *page) | |
1846 | { | |
1847 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1848 | struct se_dev_attrib, da_group); | |
1849 | ||
1850 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
1851 | } | |
1852 | ||
1853 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, | |
1854 | const char *page, size_t count) | |
1855 | { | |
1856 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1857 | struct se_dev_attrib, da_group); | |
1068be7b | 1858 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 1859 | u8 val; |
9a8bb606 BL |
1860 | int ret; |
1861 | ||
2d76443e | 1862 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
1863 | if (ret < 0) |
1864 | return ret; | |
1865 | ||
1068be7b BL |
1866 | /* Check if device has been configured before */ |
1867 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1868 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1869 | TCMU_ATTR_WRITECACHE, &val); |
1068be7b BL |
1870 | if (ret) { |
1871 | pr_err("Unable to reconfigure device\n"); | |
1872 | return ret; | |
1873 | } | |
1874 | } | |
2d76443e MC |
1875 | |
1876 | da->emulate_write_cache = val; | |
9a8bb606 BL |
1877 | return count; |
1878 | } | |
1879 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
1880 | ||
5821783b | 1881 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 1882 | &tcmu_attr_cmd_time_out, |
2d76443e | 1883 | &tcmu_attr_dev_config, |
801fc54d BL |
1884 | &tcmu_attr_dev_size, |
1885 | &tcmu_attr_emulate_write_cache, | |
1886 | NULL, | |
1887 | }; | |
1888 | ||
7d7a7435 NB |
1889 | static struct configfs_attribute **tcmu_attrs; |
1890 | ||
1891 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1892 | .name = "user", |
7c9e7a6f | 1893 | .owner = THIS_MODULE, |
a3541703 | 1894 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1895 | .attach_hba = tcmu_attach_hba, |
1896 | .detach_hba = tcmu_detach_hba, | |
1897 | .alloc_device = tcmu_alloc_device, | |
1898 | .configure_device = tcmu_configure_device, | |
92634706 | 1899 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
1900 | .free_device = tcmu_free_device, |
1901 | .parse_cdb = tcmu_parse_cdb, | |
1902 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1903 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1904 | .get_device_type = sbc_get_device_type, | |
1905 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1906 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1907 | }; |
1908 | ||
b6df4b79 XL |
1909 | static int unmap_thread_fn(void *data) |
1910 | { | |
1911 | struct tcmu_dev *udev; | |
1912 | loff_t off; | |
1913 | uint32_t start, end, block; | |
1914 | struct page *page; | |
1915 | int i; | |
1916 | ||
07932a02 | 1917 | while (!kthread_should_stop()) { |
b6df4b79 XL |
1918 | DEFINE_WAIT(__wait); |
1919 | ||
1920 | prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); | |
1921 | schedule(); | |
1922 | finish_wait(&unmap_wait, &__wait); | |
1923 | ||
d906d8af MC |
1924 | if (kthread_should_stop()) |
1925 | break; | |
1926 | ||
b6df4b79 XL |
1927 | mutex_lock(&root_udev_mutex); |
1928 | list_for_each_entry(udev, &root_udev, node) { | |
1929 | mutex_lock(&udev->cmdr_lock); | |
1930 | ||
1931 | /* Try to complete the finished commands first */ | |
1932 | tcmu_handle_completions(udev); | |
1933 | ||
1934 | /* Skip the udevs waiting the global pool or in idle */ | |
1935 | if (udev->waiting_global || !udev->dbi_thresh) { | |
1936 | mutex_unlock(&udev->cmdr_lock); | |
1937 | continue; | |
1938 | } | |
1939 | ||
1940 | end = udev->dbi_max + 1; | |
1941 | block = find_last_bit(udev->data_bitmap, end); | |
1942 | if (block == udev->dbi_max) { | |
1943 | /* | |
1944 | * The last bit is dbi_max, so there is | |
1945 | * no need to shrink any blocks. | |
1946 | */ | |
1947 | mutex_unlock(&udev->cmdr_lock); | |
1948 | continue; | |
1949 | } else if (block == end) { | |
1950 | /* The current udev will goto idle state */ | |
1951 | udev->dbi_thresh = start = 0; | |
1952 | udev->dbi_max = 0; | |
1953 | } else { | |
1954 | udev->dbi_thresh = start = block + 1; | |
1955 | udev->dbi_max = block; | |
1956 | } | |
1957 | ||
1958 | /* Here will truncate the data area from off */ | |
1959 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
1960 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
1961 | ||
1962 | /* Release the block pages */ | |
1963 | for (i = start; i < end; i++) { | |
1964 | page = radix_tree_delete(&udev->data_blocks, i); | |
1965 | if (page) { | |
1966 | __free_page(page); | |
1967 | atomic_dec(&global_db_count); | |
1968 | } | |
1969 | } | |
1970 | mutex_unlock(&udev->cmdr_lock); | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Try to wake up the udevs who are waiting | |
1975 | * for the global data pool. | |
1976 | */ | |
1977 | list_for_each_entry(udev, &root_udev, node) { | |
1978 | if (udev->waiting_global) | |
1979 | wake_up(&udev->wait_cmdr); | |
1980 | } | |
1981 | mutex_unlock(&root_udev_mutex); | |
1982 | } | |
1983 | ||
1984 | return 0; | |
1985 | } | |
1986 | ||
7c9e7a6f AG |
1987 | static int __init tcmu_module_init(void) |
1988 | { | |
801fc54d | 1989 | int ret, i, k, len = 0; |
7c9e7a6f AG |
1990 | |
1991 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1992 | ||
1993 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1994 | sizeof(struct tcmu_cmd), | |
1995 | __alignof__(struct tcmu_cmd), | |
1996 | 0, NULL); | |
1997 | if (!tcmu_cmd_cache) | |
1998 | return -ENOMEM; | |
1999 | ||
2000 | tcmu_root_device = root_device_register("tcm_user"); | |
2001 | if (IS_ERR(tcmu_root_device)) { | |
2002 | ret = PTR_ERR(tcmu_root_device); | |
2003 | goto out_free_cache; | |
2004 | } | |
2005 | ||
2006 | ret = genl_register_family(&tcmu_genl_family); | |
2007 | if (ret < 0) { | |
2008 | goto out_unreg_device; | |
2009 | } | |
2010 | ||
7d7a7435 NB |
2011 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
2012 | len += sizeof(struct configfs_attribute *); | |
2013 | } | |
801fc54d BL |
2014 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { |
2015 | len += sizeof(struct configfs_attribute *); | |
2016 | } | |
2017 | len += sizeof(struct configfs_attribute *); | |
7d7a7435 NB |
2018 | |
2019 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
2020 | if (!tcmu_attrs) { | |
2021 | ret = -ENOMEM; | |
2022 | goto out_unreg_genl; | |
2023 | } | |
2024 | ||
2025 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
2026 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
2027 | } | |
801fc54d BL |
2028 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { |
2029 | tcmu_attrs[i] = tcmu_attrib_attrs[k]; | |
2030 | i++; | |
2031 | } | |
7d7a7435 NB |
2032 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
2033 | ||
0a06d430 | 2034 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 2035 | if (ret) |
7d7a7435 | 2036 | goto out_attrs; |
7c9e7a6f | 2037 | |
b6df4b79 XL |
2038 | init_waitqueue_head(&unmap_wait); |
2039 | unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); | |
2040 | if (IS_ERR(unmap_thread)) { | |
2041 | ret = PTR_ERR(unmap_thread); | |
2042 | goto out_unreg_transport; | |
2043 | } | |
2044 | ||
7c9e7a6f AG |
2045 | return 0; |
2046 | ||
b6df4b79 XL |
2047 | out_unreg_transport: |
2048 | target_backend_unregister(&tcmu_ops); | |
7d7a7435 NB |
2049 | out_attrs: |
2050 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
2051 | out_unreg_genl: |
2052 | genl_unregister_family(&tcmu_genl_family); | |
2053 | out_unreg_device: | |
2054 | root_device_unregister(tcmu_root_device); | |
2055 | out_free_cache: | |
2056 | kmem_cache_destroy(tcmu_cmd_cache); | |
2057 | ||
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | static void __exit tcmu_module_exit(void) | |
2062 | { | |
b6df4b79 | 2063 | kthread_stop(unmap_thread); |
0a06d430 | 2064 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 2065 | kfree(tcmu_attrs); |
7c9e7a6f AG |
2066 | genl_unregister_family(&tcmu_genl_family); |
2067 | root_device_unregister(tcmu_root_device); | |
2068 | kmem_cache_destroy(tcmu_cmd_cache); | |
2069 | } | |
2070 | ||
2071 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
2072 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
2073 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
2074 | MODULE_LICENSE("GPL"); | |
2075 | ||
2076 | module_init(tcmu_module_init); | |
2077 | module_exit(tcmu_module_exit); |