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Commit | Line | Data |
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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 | ||
dc8cca4b MC |
100 | static DEFINE_MUTEX(tcmu_nl_cmd_mutex); |
101 | static LIST_HEAD(tcmu_nl_cmd_list); | |
102 | ||
103 | struct tcmu_dev; | |
104 | ||
b3af66e2 MC |
105 | struct tcmu_nl_cmd { |
106 | /* wake up thread waiting for reply */ | |
107 | struct completion complete; | |
dc8cca4b MC |
108 | struct list_head nl_list; |
109 | struct tcmu_dev *udev; | |
b3af66e2 MC |
110 | int cmd; |
111 | int status; | |
112 | }; | |
113 | ||
7c9e7a6f | 114 | struct tcmu_dev { |
b6df4b79 | 115 | struct list_head node; |
f3cdbe39 | 116 | struct kref kref; |
7c9e7a6f AG |
117 | struct se_device se_dev; |
118 | ||
119 | char *name; | |
120 | struct se_hba *hba; | |
121 | ||
122 | #define TCMU_DEV_BIT_OPEN 0 | |
123 | #define TCMU_DEV_BIT_BROKEN 1 | |
124 | unsigned long flags; | |
7c9e7a6f AG |
125 | |
126 | struct uio_info uio_info; | |
127 | ||
b6df4b79 XL |
128 | struct inode *inode; |
129 | ||
7c9e7a6f AG |
130 | struct tcmu_mailbox *mb_addr; |
131 | size_t dev_size; | |
132 | u32 cmdr_size; | |
133 | u32 cmdr_last_cleaned; | |
3d9b9555 | 134 | /* Offset of data area from start of mb */ |
26418649 | 135 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f AG |
136 | size_t data_off; |
137 | size_t data_size; | |
26418649 | 138 | |
7c9e7a6f | 139 | wait_queue_head_t wait_cmdr; |
b6df4b79 | 140 | struct mutex cmdr_lock; |
7c9e7a6f | 141 | |
b6df4b79 | 142 | bool waiting_global; |
141685a3 | 143 | uint32_t dbi_max; |
b6df4b79 | 144 | uint32_t dbi_thresh; |
141685a3 XL |
145 | DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); |
146 | struct radix_tree_root data_blocks; | |
147 | ||
7c9e7a6f AG |
148 | struct idr commands; |
149 | spinlock_t commands_lock; | |
150 | ||
151 | struct timer_list timeout; | |
af980e46 | 152 | unsigned int cmd_time_out; |
7c9e7a6f | 153 | |
b3af66e2 MC |
154 | struct tcmu_nl_cmd curr_nl_cmd; |
155 | /* wake up threads waiting on curr_nl_cmd */ | |
156 | wait_queue_head_t nl_cmd_wq; | |
157 | ||
7c9e7a6f | 158 | char dev_config[TCMU_CONFIG_LEN]; |
b849b456 KN |
159 | |
160 | int nl_reply_supported; | |
7c9e7a6f AG |
161 | }; |
162 | ||
163 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
164 | ||
165 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
166 | ||
167 | struct tcmu_cmd { | |
168 | struct se_cmd *se_cmd; | |
169 | struct tcmu_dev *tcmu_dev; | |
170 | ||
171 | uint16_t cmd_id; | |
172 | ||
26418649 | 173 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 174 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
175 | uint32_t dbi_cnt; |
176 | uint32_t dbi_cur; | |
177 | uint32_t *dbi; | |
7c9e7a6f AG |
178 | |
179 | unsigned long deadline; | |
180 | ||
181 | #define TCMU_CMD_BIT_EXPIRED 0 | |
182 | unsigned long flags; | |
183 | }; | |
184 | ||
b6df4b79 XL |
185 | static struct task_struct *unmap_thread; |
186 | static wait_queue_head_t unmap_wait; | |
187 | static DEFINE_MUTEX(root_udev_mutex); | |
188 | static LIST_HEAD(root_udev); | |
189 | ||
190 | static atomic_t global_db_count = ATOMIC_INIT(0); | |
191 | ||
7c9e7a6f AG |
192 | static struct kmem_cache *tcmu_cmd_cache; |
193 | ||
194 | /* multicast group */ | |
195 | enum tcmu_multicast_groups { | |
196 | TCMU_MCGRP_CONFIG, | |
197 | }; | |
198 | ||
199 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
200 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
201 | }; | |
202 | ||
b3af66e2 MC |
203 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
204 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
205 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
206 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
207 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
208 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
209 | }; | |
210 | ||
211 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
212 | { | |
dc8cca4b | 213 | struct tcmu_dev *udev = NULL; |
b3af66e2 MC |
214 | struct tcmu_nl_cmd *nl_cmd; |
215 | int dev_id, rc, ret = 0; | |
b3af66e2 MC |
216 | |
217 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
218 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
219 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
223 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
224 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
225 | ||
dc8cca4b MC |
226 | mutex_lock(&tcmu_nl_cmd_mutex); |
227 | list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { | |
228 | if (nl_cmd->udev->se_dev.dev_index == dev_id) { | |
229 | udev = nl_cmd->udev; | |
230 | break; | |
231 | } | |
b3af66e2 | 232 | } |
b3af66e2 | 233 | |
dc8cca4b MC |
234 | if (!udev) { |
235 | pr_err(KERN_ERR "tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", | |
236 | completed_cmd, rc, dev_id); | |
237 | ret = -ENODEV; | |
238 | goto unlock; | |
239 | } | |
240 | list_del(&nl_cmd->nl_list); | |
b3af66e2 | 241 | |
dc8cca4b MC |
242 | pr_debug("%s genl cmd done got id %d curr %d done %d rc %d\n", |
243 | udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc); | |
b3af66e2 MC |
244 | |
245 | if (nl_cmd->cmd != completed_cmd) { | |
dc8cca4b MC |
246 | pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", |
247 | udev->name, completed_cmd, nl_cmd->cmd); | |
b3af66e2 | 248 | ret = -EINVAL; |
dc8cca4b | 249 | goto unlock; |
b3af66e2 MC |
250 | } |
251 | ||
dc8cca4b MC |
252 | nl_cmd->status = rc; |
253 | complete(&nl_cmd->complete); | |
254 | unlock: | |
255 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
b3af66e2 MC |
256 | return ret; |
257 | } | |
258 | ||
259 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
260 | { | |
261 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
262 | } | |
263 | ||
264 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
265 | { | |
266 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
267 | } | |
268 | ||
269 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
270 | struct genl_info *info) | |
271 | { | |
272 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
273 | } | |
274 | ||
275 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
276 | { | |
277 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
278 | tcmu_kern_cmd_reply_supported = | |
279 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
280 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
281 | tcmu_kern_cmd_reply_supported); | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static const struct genl_ops tcmu_genl_ops[] = { | |
288 | { | |
289 | .cmd = TCMU_CMD_SET_FEATURES, | |
290 | .flags = GENL_ADMIN_PERM, | |
291 | .policy = tcmu_attr_policy, | |
292 | .doit = tcmu_genl_set_features, | |
293 | }, | |
294 | { | |
295 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
296 | .flags = GENL_ADMIN_PERM, | |
297 | .policy = tcmu_attr_policy, | |
298 | .doit = tcmu_genl_add_dev_done, | |
299 | }, | |
300 | { | |
301 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
302 | .flags = GENL_ADMIN_PERM, | |
303 | .policy = tcmu_attr_policy, | |
304 | .doit = tcmu_genl_rm_dev_done, | |
305 | }, | |
306 | { | |
307 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
308 | .flags = GENL_ADMIN_PERM, | |
309 | .policy = tcmu_attr_policy, | |
310 | .doit = tcmu_genl_reconfig_dev_done, | |
311 | }, | |
312 | }; | |
313 | ||
7c9e7a6f | 314 | /* Our generic netlink family */ |
56989f6d | 315 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 316 | .module = THIS_MODULE, |
7c9e7a6f AG |
317 | .hdrsize = 0, |
318 | .name = "TCM-USER", | |
b3af66e2 | 319 | .version = 2, |
7c9e7a6f AG |
320 | .maxattr = TCMU_ATTR_MAX, |
321 | .mcgrps = tcmu_mcgrps, | |
322 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 323 | .netnsok = true, |
b3af66e2 MC |
324 | .ops = tcmu_genl_ops, |
325 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
326 | }; |
327 | ||
141685a3 XL |
328 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
329 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
330 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
331 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
332 | ||
b6df4b79 | 333 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
334 | { |
335 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
336 | uint32_t i; | |
337 | ||
b6df4b79 | 338 | for (i = 0; i < len; i++) |
141685a3 XL |
339 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
340 | } | |
341 | ||
b6df4b79 XL |
342 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
343 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 344 | { |
b6df4b79 XL |
345 | struct page *page; |
346 | int ret, dbi; | |
141685a3 | 347 | |
b6df4b79 XL |
348 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
349 | if (dbi == udev->dbi_thresh) | |
350 | return false; | |
141685a3 | 351 | |
b6df4b79 XL |
352 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
353 | if (!page) { | |
b6df4b79 XL |
354 | if (atomic_add_return(1, &global_db_count) > |
355 | TCMU_GLOBAL_MAX_BLOCKS) { | |
356 | atomic_dec(&global_db_count); | |
357 | return false; | |
141685a3 XL |
358 | } |
359 | ||
b6df4b79 XL |
360 | /* try to get new page from the mm */ |
361 | page = alloc_page(GFP_KERNEL); | |
362 | if (!page) | |
daf78c30 | 363 | goto err_alloc; |
b6df4b79 XL |
364 | |
365 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
daf78c30 XL |
366 | if (ret) |
367 | goto err_insert; | |
141685a3 XL |
368 | } |
369 | ||
b6df4b79 XL |
370 | if (dbi > udev->dbi_max) |
371 | udev->dbi_max = dbi; | |
372 | ||
373 | set_bit(dbi, udev->data_bitmap); | |
374 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
375 | ||
376 | return true; | |
daf78c30 XL |
377 | err_insert: |
378 | __free_page(page); | |
379 | err_alloc: | |
380 | atomic_dec(&global_db_count); | |
381 | return false; | |
141685a3 XL |
382 | } |
383 | ||
b6df4b79 XL |
384 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
385 | struct tcmu_cmd *tcmu_cmd) | |
386 | { | |
387 | int i; | |
388 | ||
389 | udev->waiting_global = false; | |
390 | ||
391 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { | |
392 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
393 | goto err; | |
394 | } | |
395 | return true; | |
396 | ||
397 | err: | |
398 | udev->waiting_global = true; | |
399 | /* Try to wake up the unmap thread */ | |
400 | wake_up(&unmap_wait); | |
401 | return false; | |
402 | } | |
403 | ||
404 | static inline struct page * | |
405 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
406 | { |
407 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
408 | } | |
409 | ||
410 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
411 | { | |
412 | kfree(tcmu_cmd->dbi); | |
413 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
414 | } | |
415 | ||
416 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
417 | { | |
418 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
419 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
420 | ||
421 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
422 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
423 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
424 | DATA_BLOCK_SIZE); | |
425 | } | |
426 | ||
427 | return data_length; | |
428 | } | |
429 | ||
430 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
431 | { | |
432 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
433 | ||
434 | return data_length / DATA_BLOCK_SIZE; | |
435 | } | |
436 | ||
7c9e7a6f AG |
437 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
438 | { | |
439 | struct se_device *se_dev = se_cmd->se_dev; | |
440 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
441 | struct tcmu_cmd *tcmu_cmd; | |
7c9e7a6f AG |
442 | |
443 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
444 | if (!tcmu_cmd) | |
445 | return NULL; | |
446 | ||
447 | tcmu_cmd->se_cmd = se_cmd; | |
448 | tcmu_cmd->tcmu_dev = udev; | |
7c9e7a6f | 449 | |
141685a3 XL |
450 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
451 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
452 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
453 | GFP_KERNEL); | |
454 | if (!tcmu_cmd->dbi) { | |
455 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
456 | return NULL; | |
457 | } | |
458 | ||
7c9e7a6f AG |
459 | return tcmu_cmd; |
460 | } | |
461 | ||
462 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
463 | { | |
b75d8063 | 464 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
465 | |
466 | size = round_up(size+offset, PAGE_SIZE); | |
467 | vaddr -= offset; | |
468 | ||
469 | while (size) { | |
470 | flush_dcache_page(virt_to_page(vaddr)); | |
471 | size -= PAGE_SIZE; | |
472 | } | |
473 | } | |
474 | ||
475 | /* | |
476 | * Some ring helper functions. We don't assume size is a power of 2 so | |
477 | * we can't use circ_buf.h. | |
478 | */ | |
479 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
480 | { | |
481 | int diff = head - tail; | |
482 | ||
483 | if (diff >= 0) | |
484 | return diff; | |
485 | else | |
486 | return size + diff; | |
487 | } | |
488 | ||
489 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
490 | { | |
491 | /* Keep 1 byte unused or we can't tell full from empty */ | |
492 | return (size - spc_used(head, tail, size) - 1); | |
493 | } | |
494 | ||
495 | static inline size_t head_to_end(size_t head, size_t size) | |
496 | { | |
497 | return size - head; | |
498 | } | |
499 | ||
f1dbd087 SY |
500 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
501 | struct tcmu_dev *udev) | |
502 | { | |
503 | struct iovec *iovec; | |
504 | ||
505 | if (*iov_cnt != 0) | |
506 | (*iov)++; | |
507 | (*iov_cnt)++; | |
508 | ||
509 | iovec = *iov; | |
510 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
511 | } |
512 | ||
7c9e7a6f AG |
513 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
514 | ||
26418649 | 515 | /* offset is relative to mb_addr */ |
141685a3 XL |
516 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
517 | int dbi, int remaining) | |
26418649 | 518 | { |
141685a3 | 519 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
520 | DATA_BLOCK_SIZE - remaining; |
521 | } | |
522 | ||
daf78c30 | 523 | static inline size_t iov_tail(struct iovec *iov) |
26418649 SY |
524 | { |
525 | return (size_t)iov->iov_base + iov->iov_len; | |
526 | } | |
527 | ||
b6df4b79 | 528 | static int scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
529 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
530 | unsigned int data_nents, struct iovec **iov, | |
531 | int *iov_cnt, bool copy_data) | |
f97ec7db | 532 | { |
141685a3 | 533 | int i, dbi; |
26418649 | 534 | int block_remaining = 0; |
141685a3 XL |
535 | void *from, *to = NULL; |
536 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 537 | struct scatterlist *sg; |
b6df4b79 | 538 | struct page *page; |
f97ec7db IT |
539 | |
540 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 541 | int sg_remaining = sg->length; |
f97ec7db | 542 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
543 | while (sg_remaining > 0) { |
544 | if (block_remaining == 0) { | |
b6df4b79 XL |
545 | if (to) |
546 | kunmap_atomic(to); | |
547 | ||
26418649 | 548 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
549 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
550 | page = tcmu_get_block_page(udev, dbi); | |
551 | to = kmap_atomic(page); | |
26418649 | 552 | } |
141685a3 | 553 | |
26418649 SY |
554 | copy_bytes = min_t(size_t, sg_remaining, |
555 | block_remaining); | |
141685a3 | 556 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 557 | block_remaining); |
141685a3 | 558 | |
26418649 | 559 | if (*iov_cnt != 0 && |
daf78c30 | 560 | to_offset == iov_tail(*iov)) { |
26418649 SY |
561 | (*iov)->iov_len += copy_bytes; |
562 | } else { | |
563 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 564 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
565 | (*iov)->iov_len = copy_bytes; |
566 | } | |
f97ec7db | 567 | if (copy_data) { |
c542942c XL |
568 | offset = DATA_BLOCK_SIZE - block_remaining; |
569 | memcpy(to + offset, | |
570 | from + sg->length - sg_remaining, | |
571 | copy_bytes); | |
f97ec7db IT |
572 | tcmu_flush_dcache_range(to, copy_bytes); |
573 | } | |
26418649 SY |
574 | sg_remaining -= copy_bytes; |
575 | block_remaining -= copy_bytes; | |
f97ec7db | 576 | } |
e2e21bd8 | 577 | kunmap_atomic(from - sg->offset); |
f97ec7db | 578 | } |
b6df4b79 XL |
579 | if (to) |
580 | kunmap_atomic(to); | |
f97ec7db | 581 | |
141685a3 | 582 | return 0; |
0c28481f SY |
583 | } |
584 | ||
a5d68ba8 XL |
585 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
586 | bool bidi) | |
f97ec7db | 587 | { |
a5d68ba8 | 588 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 589 | int i, dbi; |
26418649 | 590 | int block_remaining = 0; |
b6df4b79 | 591 | void *from = NULL, *to; |
141685a3 | 592 | size_t copy_bytes, offset; |
a5d68ba8 | 593 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 594 | struct page *page; |
a5d68ba8 | 595 | unsigned int data_nents; |
141685a3 | 596 | uint32_t count = 0; |
a5d68ba8 XL |
597 | |
598 | if (!bidi) { | |
599 | data_sg = se_cmd->t_data_sg; | |
600 | data_nents = se_cmd->t_data_nents; | |
601 | } else { | |
a5d68ba8 XL |
602 | |
603 | /* | |
604 | * For bidi case, the first count blocks are for Data-Out | |
605 | * buffer blocks, and before gathering the Data-In buffer | |
606 | * the Data-Out buffer blocks should be discarded. | |
607 | */ | |
608 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
609 | |
610 | data_sg = se_cmd->t_bidi_data_sg; | |
611 | data_nents = se_cmd->t_bidi_data_nents; | |
612 | } | |
f97ec7db | 613 | |
141685a3 XL |
614 | tcmu_cmd_set_dbi_cur(cmd, count); |
615 | ||
f97ec7db | 616 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 617 | int sg_remaining = sg->length; |
f97ec7db | 618 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
619 | while (sg_remaining > 0) { |
620 | if (block_remaining == 0) { | |
b6df4b79 XL |
621 | if (from) |
622 | kunmap_atomic(from); | |
623 | ||
26418649 | 624 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 625 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
626 | page = tcmu_get_block_page(udev, dbi); |
627 | from = kmap_atomic(page); | |
26418649 SY |
628 | } |
629 | copy_bytes = min_t(size_t, sg_remaining, | |
630 | block_remaining); | |
141685a3 | 631 | offset = DATA_BLOCK_SIZE - block_remaining; |
f97ec7db | 632 | tcmu_flush_dcache_range(from, copy_bytes); |
c542942c | 633 | memcpy(to + sg->length - sg_remaining, from + offset, |
26418649 | 634 | copy_bytes); |
f97ec7db | 635 | |
26418649 SY |
636 | sg_remaining -= copy_bytes; |
637 | block_remaining -= copy_bytes; | |
f97ec7db | 638 | } |
e2e21bd8 | 639 | kunmap_atomic(to - sg->offset); |
f97ec7db | 640 | } |
b6df4b79 XL |
641 | if (from) |
642 | kunmap_atomic(from); | |
f97ec7db IT |
643 | } |
644 | ||
b6df4b79 | 645 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 646 | { |
b6df4b79 | 647 | return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); |
26418649 SY |
648 | } |
649 | ||
7c9e7a6f | 650 | /* |
f97ec7db | 651 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 652 | * space available on the data area. |
7c9e7a6f AG |
653 | * |
654 | * Called with ring lock held. | |
655 | */ | |
b6df4b79 XL |
656 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
657 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
658 | { |
659 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
660 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
661 | / DATA_BLOCK_SIZE; | |
0241fd39 | 662 | size_t space, cmd_needed; |
7c9e7a6f AG |
663 | u32 cmd_head; |
664 | ||
665 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
666 | ||
667 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
668 | ||
f56574a2 AG |
669 | /* |
670 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
671 | * original cmd - cmds are internally contiguous. | |
672 | */ | |
673 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
674 | cmd_needed = cmd_size; | |
675 | else | |
676 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
677 | ||
7c9e7a6f AG |
678 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
679 | if (space < cmd_needed) { | |
680 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
681 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
682 | return false; | |
683 | } | |
684 | ||
b6df4b79 XL |
685 | /* try to check and get the data blocks as needed */ |
686 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
7c9e7a6f | 687 | if (space < data_needed) { |
b6df4b79 XL |
688 | unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; |
689 | unsigned long grow; | |
690 | ||
691 | if (blocks_left < blocks_needed) { | |
692 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
693 | blocks_left * DATA_BLOCK_SIZE, | |
694 | data_needed); | |
695 | return false; | |
696 | } | |
697 | ||
698 | /* Try to expand the thresh */ | |
699 | if (!udev->dbi_thresh) { | |
700 | /* From idle state */ | |
701 | uint32_t init_thresh = DATA_BLOCK_INIT_BITS; | |
702 | ||
703 | udev->dbi_thresh = max(blocks_needed, init_thresh); | |
704 | } else { | |
705 | /* | |
706 | * Grow the data area by max(blocks needed, | |
707 | * dbi_thresh / 2), but limited to the max | |
708 | * DATA_BLOCK_BITS size. | |
709 | */ | |
710 | grow = max(blocks_needed, udev->dbi_thresh / 2); | |
711 | udev->dbi_thresh += grow; | |
712 | if (udev->dbi_thresh > DATA_BLOCK_BITS) | |
713 | udev->dbi_thresh = DATA_BLOCK_BITS; | |
714 | } | |
7c9e7a6f AG |
715 | } |
716 | ||
daf78c30 | 717 | return tcmu_get_empty_blocks(udev, cmd); |
7c9e7a6f AG |
718 | } |
719 | ||
fe25cc34 XL |
720 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
721 | { | |
722 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
723 | sizeof(struct tcmu_cmd_entry)); | |
724 | } | |
725 | ||
726 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
727 | size_t base_command_size) | |
728 | { | |
729 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
730 | size_t command_size; | |
731 | ||
732 | command_size = base_command_size + | |
733 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
734 | TCMU_OP_ALIGN_SIZE); | |
735 | ||
736 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
737 | ||
738 | return command_size; | |
739 | } | |
740 | ||
0d44374c MC |
741 | static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd) |
742 | { | |
743 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
744 | unsigned long tmo = udev->cmd_time_out; | |
745 | int cmd_id; | |
746 | ||
747 | if (tcmu_cmd->cmd_id) | |
748 | return 0; | |
749 | ||
750 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); | |
751 | if (cmd_id < 0) { | |
752 | pr_err("tcmu: Could not allocate cmd id.\n"); | |
753 | return cmd_id; | |
754 | } | |
755 | tcmu_cmd->cmd_id = cmd_id; | |
756 | ||
757 | if (!tmo) | |
758 | return 0; | |
759 | ||
760 | tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); | |
761 | mod_timer(&udev->timeout, tcmu_cmd->deadline); | |
762 | return 0; | |
763 | } | |
764 | ||
02eb924f AG |
765 | static sense_reason_t |
766 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
767 | { |
768 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
769 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
770 | size_t base_command_size, command_size; | |
7c9e7a6f | 771 | struct tcmu_mailbox *mb; |
7c9e7a6f | 772 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 773 | struct iovec *iov; |
141685a3 | 774 | int iov_cnt, ret; |
7c9e7a6f AG |
775 | uint32_t cmd_head; |
776 | uint64_t cdb_off; | |
f97ec7db | 777 | bool copy_to_data_area; |
ab22d260 | 778 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
779 | |
780 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 781 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
782 | |
783 | /* | |
784 | * Must be a certain minimum size for response sense info, but | |
785 | * also may be larger if the iov array is large. | |
786 | * | |
fe25cc34 XL |
787 | * We prepare as many iovs as possbile for potential uses here, |
788 | * because it's expensive to tell how many regions are freed in | |
789 | * the bitmap & global data pool, as the size calculated here | |
790 | * will only be used to do the checks. | |
791 | * | |
792 | * The size will be recalculated later as actually needed to save | |
793 | * cmd area memories. | |
794 | */ | |
795 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
796 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 797 | |
b6df4b79 | 798 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
799 | |
800 | mb = udev->mb_addr; | |
801 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
802 | if ((command_size > (udev->cmdr_size / 2)) || |
803 | data_length > udev->data_size) { | |
804 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 805 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 806 | udev->cmdr_size, udev->data_size); |
b6df4b79 | 807 | mutex_unlock(&udev->cmdr_lock); |
554617b2 AG |
808 | return TCM_INVALID_CDB_FIELD; |
809 | } | |
7c9e7a6f | 810 | |
b6df4b79 | 811 | while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
7c9e7a6f AG |
812 | int ret; |
813 | DEFINE_WAIT(__wait); | |
814 | ||
6bc46be4 MC |
815 | /* |
816 | * Don't leave commands partially setup because the unmap | |
817 | * thread might need the blocks to make forward progress. | |
818 | */ | |
819 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); | |
820 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); | |
821 | ||
7c9e7a6f AG |
822 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); |
823 | ||
824 | pr_debug("sleeping for ring space\n"); | |
b6df4b79 | 825 | mutex_unlock(&udev->cmdr_lock); |
af980e46 MC |
826 | if (udev->cmd_time_out) |
827 | ret = schedule_timeout( | |
828 | msecs_to_jiffies(udev->cmd_time_out)); | |
829 | else | |
830 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
831 | finish_wait(&udev->wait_cmdr, &__wait); |
832 | if (!ret) { | |
833 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 834 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
835 | } |
836 | ||
b6df4b79 | 837 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
838 | |
839 | /* We dropped cmdr_lock, cmd_head is stale */ | |
840 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
841 | } | |
842 | ||
f56574a2 AG |
843 | /* Insert a PAD if end-of-ring space is too small */ |
844 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
845 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
846 | ||
7c9e7a6f | 847 | entry = (void *) mb + CMDR_OFF + cmd_head; |
0ad46af8 AG |
848 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
849 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
850 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
851 | entry->hdr.kflags = 0; | |
852 | entry->hdr.uflags = 0; | |
9d62bc0e | 853 | tcmu_flush_dcache_range(entry, sizeof(*entry)); |
7c9e7a6f AG |
854 | |
855 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
9d62bc0e | 856 | tcmu_flush_dcache_range(mb, sizeof(*mb)); |
7c9e7a6f AG |
857 | |
858 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
859 | WARN_ON(cmd_head != 0); | |
860 | } | |
861 | ||
862 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
b3743c71 | 863 | memset(entry, 0, command_size); |
0ad46af8 | 864 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
7c9e7a6f | 865 | |
3d9b9555 | 866 | /* Handle allocating space from the data area */ |
b6df4b79 | 867 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 868 | iov = &entry->req.iov[0]; |
f97ec7db | 869 | iov_cnt = 0; |
e4648b01 IT |
870 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
871 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
b6df4b79 XL |
872 | ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
873 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
874 | copy_to_data_area); | |
141685a3 | 875 | if (ret) { |
b6df4b79 XL |
876 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
877 | mutex_unlock(&udev->cmdr_lock); | |
878 | ||
141685a3 XL |
879 | pr_err("tcmu: alloc and scatter data failed\n"); |
880 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
881 | } | |
7c9e7a6f AG |
882 | entry->req.iov_cnt = iov_cnt; |
883 | ||
e4648b01 | 884 | /* Handle BIDI commands */ |
b3743c71 | 885 | iov_cnt = 0; |
ab22d260 | 886 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 887 | iov++; |
b6df4b79 | 888 | ret = scatter_data_area(udev, tcmu_cmd, |
141685a3 XL |
889 | se_cmd->t_bidi_data_sg, |
890 | se_cmd->t_bidi_data_nents, | |
891 | &iov, &iov_cnt, false); | |
892 | if (ret) { | |
b6df4b79 XL |
893 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
894 | mutex_unlock(&udev->cmdr_lock); | |
895 | ||
141685a3 XL |
896 | pr_err("tcmu: alloc and scatter bidi data failed\n"); |
897 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
898 | } | |
ab22d260 | 899 | } |
b3743c71 | 900 | entry->req.iov_bidi_cnt = iov_cnt; |
26418649 | 901 | |
0d44374c MC |
902 | ret = tcmu_setup_cmd_timer(tcmu_cmd); |
903 | if (ret) { | |
904 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); | |
97488c73 | 905 | mutex_unlock(&udev->cmdr_lock); |
0d44374c MC |
906 | return TCM_OUT_OF_RESOURCES; |
907 | } | |
908 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
909 | ||
fe25cc34 XL |
910 | /* |
911 | * Recalaulate the command's base size and size according | |
912 | * to the actual needs | |
913 | */ | |
914 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
915 | entry->req.iov_bidi_cnt); | |
916 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
917 | ||
918 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
919 | ||
7c9e7a6f AG |
920 | /* All offsets relative to mb_addr, not start of entry! */ |
921 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
922 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
923 | entry->req.cdb_off = cdb_off; | |
924 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
925 | ||
926 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
927 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
b6df4b79 | 928 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
929 | |
930 | /* TODO: only if FLUSH and FUA? */ | |
931 | uio_event_notify(&udev->uio_info); | |
932 | ||
af980e46 MC |
933 | if (udev->cmd_time_out) |
934 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
935 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 936 | |
02eb924f | 937 | return TCM_NO_SENSE; |
7c9e7a6f AG |
938 | } |
939 | ||
02eb924f AG |
940 | static sense_reason_t |
941 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f | 942 | { |
7c9e7a6f | 943 | struct tcmu_cmd *tcmu_cmd; |
ecaf597b | 944 | sense_reason_t ret; |
7c9e7a6f AG |
945 | |
946 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
947 | if (!tcmu_cmd) | |
02eb924f | 948 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
949 | |
950 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 951 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f | 952 | pr_err("TCMU: Could not queue command\n"); |
7c9e7a6f | 953 | |
141685a3 | 954 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
955 | } |
956 | ||
957 | return ret; | |
958 | } | |
959 | ||
960 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
961 | { | |
962 | struct se_cmd *se_cmd = cmd->se_cmd; | |
963 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
964 | ||
141685a3 XL |
965 | /* |
966 | * cmd has been completed already from timeout, just reclaim | |
967 | * data area space and free cmd | |
968 | */ | |
969 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
970 | goto out; | |
b25c7863 | 971 | |
141685a3 | 972 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 973 | |
0ad46af8 | 974 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
975 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
976 | cmd->se_cmd); | |
ed97d0cd AG |
977 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
978 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 979 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
e4648b01 | 980 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 981 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 982 | gather_data_area(udev, cmd, true); |
e4648b01 | 983 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 984 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 985 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 986 | /* TODO: */ |
2bc396a2 IT |
987 | } else if (se_cmd->data_direction != DMA_NONE) { |
988 | pr_warn("TCMU: data direction was %d!\n", | |
989 | se_cmd->data_direction); | |
7c9e7a6f AG |
990 | } |
991 | ||
992 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 993 | |
141685a3 XL |
994 | out: |
995 | cmd->se_cmd = NULL; | |
b6df4b79 | 996 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 997 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
998 | } |
999 | ||
1000 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
1001 | { | |
1002 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
1003 | int handled = 0; |
1004 | ||
1005 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
1006 | pr_err("ring broken, not handling completions\n"); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
7c9e7a6f AG |
1010 | mb = udev->mb_addr; |
1011 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1012 | ||
6aa7de05 | 1013 | while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
7c9e7a6f AG |
1014 | |
1015 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
1016 | struct tcmu_cmd *cmd; | |
1017 | ||
1018 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
1019 | ||
0ad46af8 AG |
1020 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
1021 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
1022 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1023 | udev->cmdr_size); | |
7c9e7a6f AG |
1024 | continue; |
1025 | } | |
0ad46af8 | 1026 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
1027 | |
1028 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 1029 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
1030 | spin_unlock(&udev->commands_lock); |
1031 | ||
1032 | if (!cmd) { | |
1033 | pr_err("cmd_id not found, ring is broken\n"); | |
1034 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | tcmu_handle_completion(cmd, entry); | |
1039 | ||
0ad46af8 AG |
1040 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1041 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1042 | udev->cmdr_size); | |
7c9e7a6f AG |
1043 | |
1044 | handled++; | |
1045 | } | |
1046 | ||
1047 | if (mb->cmd_tail == mb->cmd_head) | |
1048 | del_timer(&udev->timeout); /* no more pending cmds */ | |
1049 | ||
7c9e7a6f AG |
1050 | wake_up(&udev->wait_cmdr); |
1051 | ||
1052 | return handled; | |
1053 | } | |
1054 | ||
1055 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
1056 | { | |
1057 | struct tcmu_cmd *cmd = p; | |
1058 | ||
1059 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
1060 | return 0; | |
1061 | ||
611e2267 | 1062 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
1063 | return 0; |
1064 | ||
1065 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1066 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
1067 | cmd->se_cmd = NULL; | |
1068 | ||
7c9e7a6f AG |
1069 | return 0; |
1070 | } | |
1071 | ||
e99e88a9 | 1072 | static void tcmu_device_timedout(struct timer_list *t) |
7c9e7a6f | 1073 | { |
e99e88a9 | 1074 | struct tcmu_dev *udev = from_timer(udev, t, timeout); |
7c9e7a6f | 1075 | unsigned long flags; |
7c9e7a6f AG |
1076 | |
1077 | spin_lock_irqsave(&udev->commands_lock, flags); | |
1078 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
1079 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
1080 | ||
b6df4b79 XL |
1081 | /* Try to wake up the ummap thread */ |
1082 | wake_up(&unmap_wait); | |
1083 | ||
7c9e7a6f AG |
1084 | /* |
1085 | * We don't need to wakeup threads on wait_cmdr since they have their | |
1086 | * own timeout. | |
1087 | */ | |
1088 | } | |
1089 | ||
1090 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
1091 | { | |
1092 | struct tcmu_hba *tcmu_hba; | |
1093 | ||
1094 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1095 | if (!tcmu_hba) | |
1096 | return -ENOMEM; | |
1097 | ||
1098 | tcmu_hba->host_id = host_id; | |
1099 | hba->hba_ptr = tcmu_hba; | |
1100 | ||
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static void tcmu_detach_hba(struct se_hba *hba) | |
1105 | { | |
1106 | kfree(hba->hba_ptr); | |
1107 | hba->hba_ptr = NULL; | |
1108 | } | |
1109 | ||
1110 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1111 | { | |
1112 | struct tcmu_dev *udev; | |
1113 | ||
1114 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1115 | if (!udev) | |
1116 | return NULL; | |
f3cdbe39 | 1117 | kref_init(&udev->kref); |
7c9e7a6f AG |
1118 | |
1119 | udev->name = kstrdup(name, GFP_KERNEL); | |
1120 | if (!udev->name) { | |
1121 | kfree(udev); | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | udev->hba = hba; | |
af980e46 | 1126 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
1127 | |
1128 | init_waitqueue_head(&udev->wait_cmdr); | |
b6df4b79 | 1129 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f AG |
1130 | |
1131 | idr_init(&udev->commands); | |
1132 | spin_lock_init(&udev->commands_lock); | |
1133 | ||
e99e88a9 | 1134 | timer_setup(&udev->timeout, tcmu_device_timedout, 0); |
7c9e7a6f | 1135 | |
b3af66e2 | 1136 | init_waitqueue_head(&udev->nl_cmd_wq); |
b3af66e2 | 1137 | |
c22adc0b XL |
1138 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
1139 | ||
7c9e7a6f AG |
1140 | return &udev->se_dev; |
1141 | } | |
1142 | ||
1143 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
1144 | { | |
1145 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
1146 | ||
b6df4b79 | 1147 | mutex_lock(&tcmu_dev->cmdr_lock); |
7c9e7a6f | 1148 | tcmu_handle_completions(tcmu_dev); |
b6df4b79 | 1149 | mutex_unlock(&tcmu_dev->cmdr_lock); |
7c9e7a6f AG |
1150 | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1156 | * and this stuff must come along. | |
1157 | */ | |
1158 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1159 | { | |
1160 | struct tcmu_dev *udev = vma->vm_private_data; | |
1161 | struct uio_info *info = &udev->uio_info; | |
1162 | ||
1163 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1164 | if (info->mem[vma->vm_pgoff].size == 0) | |
1165 | return -1; | |
1166 | return (int)vma->vm_pgoff; | |
1167 | } | |
1168 | return -1; | |
1169 | } | |
1170 | ||
b6df4b79 XL |
1171 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1172 | { | |
1173 | struct page *page; | |
1174 | int ret; | |
1175 | ||
1176 | mutex_lock(&udev->cmdr_lock); | |
1177 | page = tcmu_get_block_page(udev, dbi); | |
1178 | if (likely(page)) { | |
1179 | mutex_unlock(&udev->cmdr_lock); | |
1180 | return page; | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Normally it shouldn't be here: | |
1185 | * Only when the userspace has touched the blocks which | |
1186 | * are out of the tcmu_cmd's data iov[], and will return | |
1187 | * one zeroed page. | |
1188 | */ | |
1189 | pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); | |
1190 | pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); | |
1191 | ||
1192 | if (dbi >= udev->dbi_thresh) { | |
1193 | /* Extern the udev->dbi_thresh to dbi + 1 */ | |
1194 | udev->dbi_thresh = dbi + 1; | |
1195 | udev->dbi_max = dbi; | |
1196 | } | |
1197 | ||
1198 | page = radix_tree_lookup(&udev->data_blocks, dbi); | |
1199 | if (!page) { | |
1200 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1201 | if (!page) { | |
1202 | mutex_unlock(&udev->cmdr_lock); | |
1203 | return NULL; | |
1204 | } | |
1205 | ||
1206 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
1207 | if (ret) { | |
1208 | mutex_unlock(&udev->cmdr_lock); | |
1209 | __free_page(page); | |
1210 | return NULL; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * Since this case is rare in page fault routine, here we | |
1215 | * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS | |
1216 | * to reduce possible page fault call trace. | |
1217 | */ | |
1218 | atomic_inc(&global_db_count); | |
1219 | } | |
1220 | mutex_unlock(&udev->cmdr_lock); | |
1221 | ||
1222 | return page; | |
1223 | } | |
1224 | ||
11bac800 | 1225 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1226 | { |
11bac800 | 1227 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1228 | struct uio_info *info = &udev->uio_info; |
1229 | struct page *page; | |
1230 | unsigned long offset; | |
1231 | void *addr; | |
1232 | ||
11bac800 | 1233 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1234 | if (mi < 0) |
1235 | return VM_FAULT_SIGBUS; | |
1236 | ||
1237 | /* | |
1238 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1239 | * to use mem[N]. | |
1240 | */ | |
1241 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1242 | ||
141685a3 XL |
1243 | if (offset < udev->data_off) { |
1244 | /* For the vmalloc()ed cmd area pages */ | |
1245 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1246 | page = vmalloc_to_page(addr); |
141685a3 | 1247 | } else { |
141685a3 XL |
1248 | uint32_t dbi; |
1249 | ||
b6df4b79 | 1250 | /* For the dynamically growing data area pages */ |
141685a3 | 1251 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1252 | page = tcmu_try_get_block_page(udev, dbi); |
1253 | if (!page) | |
141685a3 | 1254 | return VM_FAULT_NOPAGE; |
141685a3 XL |
1255 | } |
1256 | ||
7c9e7a6f AG |
1257 | get_page(page); |
1258 | vmf->page = page; | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1263 | .fault = tcmu_vma_fault, | |
1264 | }; | |
1265 | ||
1266 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1267 | { | |
1268 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1269 | ||
1270 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1271 | vma->vm_ops = &tcmu_vm_ops; | |
1272 | ||
1273 | vma->vm_private_data = udev; | |
1274 | ||
1275 | /* Ensure the mmap is exactly the right size */ | |
1276 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1277 | return -EINVAL; | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1283 | { | |
1284 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1285 | ||
1286 | /* O_EXCL not supported for char devs, so fake it? */ | |
1287 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1288 | return -EBUSY; | |
1289 | ||
b6df4b79 | 1290 | udev->inode = inode; |
9260695d | 1291 | kref_get(&udev->kref); |
b6df4b79 | 1292 | |
7c9e7a6f AG |
1293 | pr_debug("open\n"); |
1294 | ||
1295 | return 0; | |
1296 | } | |
1297 | ||
f3cdbe39 MC |
1298 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1299 | { | |
1300 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1301 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1302 | ||
1303 | kfree(udev->uio_info.name); | |
1304 | kfree(udev->name); | |
1305 | kfree(udev); | |
1306 | } | |
1307 | ||
c22adc0b XL |
1308 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
1309 | { | |
1310 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
1311 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
1312 | return 0; | |
1313 | } | |
1314 | return -EINVAL; | |
1315 | } | |
1316 | ||
1317 | static void tcmu_blocks_release(struct tcmu_dev *udev) | |
1318 | { | |
1319 | int i; | |
1320 | struct page *page; | |
1321 | ||
1322 | /* Try to release all block pages */ | |
1323 | mutex_lock(&udev->cmdr_lock); | |
1324 | for (i = 0; i <= udev->dbi_max; i++) { | |
1325 | page = radix_tree_delete(&udev->data_blocks, i); | |
1326 | if (page) { | |
1327 | __free_page(page); | |
1328 | atomic_dec(&global_db_count); | |
1329 | } | |
1330 | } | |
1331 | mutex_unlock(&udev->cmdr_lock); | |
1332 | } | |
1333 | ||
f3cdbe39 MC |
1334 | static void tcmu_dev_kref_release(struct kref *kref) |
1335 | { | |
1336 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1337 | struct se_device *dev = &udev->se_dev; | |
c22adc0b XL |
1338 | struct tcmu_cmd *cmd; |
1339 | bool all_expired = true; | |
1340 | int i; | |
1341 | ||
1342 | vfree(udev->mb_addr); | |
1343 | udev->mb_addr = NULL; | |
1344 | ||
1345 | /* Upper layer should drain all requests before calling this */ | |
1346 | spin_lock_irq(&udev->commands_lock); | |
1347 | idr_for_each_entry(&udev->commands, cmd, i) { | |
1348 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1349 | all_expired = false; | |
1350 | } | |
1351 | idr_destroy(&udev->commands); | |
1352 | spin_unlock_irq(&udev->commands_lock); | |
1353 | WARN_ON(!all_expired); | |
1354 | ||
1355 | tcmu_blocks_release(udev); | |
f3cdbe39 MC |
1356 | |
1357 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1358 | } | |
1359 | ||
7c9e7a6f AG |
1360 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1361 | { | |
1362 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1363 | ||
1364 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1365 | ||
1366 | pr_debug("close\n"); | |
9260695d | 1367 | /* release ref from open */ |
f3cdbe39 | 1368 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1369 | return 0; |
1370 | } | |
1371 | ||
b3af66e2 MC |
1372 | static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
1373 | { | |
1374 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1375 | ||
1376 | if (!tcmu_kern_cmd_reply_supported) | |
1377 | return; | |
b849b456 KN |
1378 | |
1379 | if (udev->nl_reply_supported <= 0) | |
1380 | return; | |
1381 | ||
b3af66e2 | 1382 | relock: |
dc8cca4b | 1383 | mutex_lock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1384 | |
1385 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
dc8cca4b | 1386 | mutex_unlock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1387 | pr_debug("sleeping for open nl cmd\n"); |
1388 | wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); | |
1389 | goto relock; | |
1390 | } | |
1391 | ||
1392 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1393 | nl_cmd->cmd = cmd; | |
dc8cca4b | 1394 | nl_cmd->udev = udev; |
b3af66e2 | 1395 | init_completion(&nl_cmd->complete); |
dc8cca4b MC |
1396 | INIT_LIST_HEAD(&nl_cmd->nl_list); |
1397 | ||
1398 | list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); | |
b3af66e2 | 1399 | |
dc8cca4b | 1400 | mutex_unlock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1401 | } |
1402 | ||
1403 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) | |
1404 | { | |
1405 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1406 | int ret; | |
b3af66e2 MC |
1407 | |
1408 | if (!tcmu_kern_cmd_reply_supported) | |
1409 | return 0; | |
1410 | ||
b849b456 KN |
1411 | if (udev->nl_reply_supported <= 0) |
1412 | return 0; | |
1413 | ||
b3af66e2 MC |
1414 | pr_debug("sleeping for nl reply\n"); |
1415 | wait_for_completion(&nl_cmd->complete); | |
1416 | ||
dc8cca4b | 1417 | mutex_lock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1418 | nl_cmd->cmd = TCMU_CMD_UNSPEC; |
1419 | ret = nl_cmd->status; | |
1420 | nl_cmd->status = 0; | |
dc8cca4b | 1421 | mutex_unlock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1422 | |
1423 | wake_up_all(&udev->nl_cmd_wq); | |
1424 | ||
1425 | return ret;; | |
1426 | } | |
1427 | ||
1428 | static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, | |
1429 | int reconfig_attr, const void *reconfig_data) | |
7c9e7a6f AG |
1430 | { |
1431 | struct sk_buff *skb; | |
1432 | void *msg_header; | |
6e14eab9 | 1433 | int ret = -ENOMEM; |
7c9e7a6f AG |
1434 | |
1435 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1436 | if (!skb) | |
6e14eab9 | 1437 | return ret; |
7c9e7a6f AG |
1438 | |
1439 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1440 | if (!msg_header) |
1441 | goto free_skb; | |
7c9e7a6f | 1442 | |
b3af66e2 | 1443 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1444 | if (ret < 0) |
1445 | goto free_skb; | |
7c9e7a6f | 1446 | |
b3af66e2 MC |
1447 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1448 | if (ret < 0) | |
1449 | goto free_skb; | |
1450 | ||
1451 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1452 | if (ret < 0) |
1453 | goto free_skb; | |
7c9e7a6f | 1454 | |
2d76443e MC |
1455 | if (cmd == TCMU_CMD_RECONFIG_DEVICE) { |
1456 | switch (reconfig_attr) { | |
1457 | case TCMU_ATTR_DEV_CFG: | |
1458 | ret = nla_put_string(skb, reconfig_attr, reconfig_data); | |
1459 | break; | |
1460 | case TCMU_ATTR_DEV_SIZE: | |
1461 | ret = nla_put_u64_64bit(skb, reconfig_attr, | |
1462 | *((u64 *)reconfig_data), | |
1463 | TCMU_ATTR_PAD); | |
1464 | break; | |
1465 | case TCMU_ATTR_WRITECACHE: | |
1466 | ret = nla_put_u8(skb, reconfig_attr, | |
1467 | *((u8 *)reconfig_data)); | |
1468 | break; | |
1469 | default: | |
1470 | BUG(); | |
1471 | } | |
1472 | ||
1473 | if (ret < 0) | |
1474 | goto free_skb; | |
1475 | } | |
8a45885c | 1476 | |
053c095a | 1477 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1478 | |
b3af66e2 MC |
1479 | tcmu_init_genl_cmd_reply(udev, cmd); |
1480 | ||
20c08b36 | 1481 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f | 1482 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
7c9e7a6f AG |
1483 | /* We don't care if no one is listening */ |
1484 | if (ret == -ESRCH) | |
1485 | ret = 0; | |
b3af66e2 MC |
1486 | if (!ret) |
1487 | ret = tcmu_wait_genl_cmd_reply(udev); | |
7c9e7a6f AG |
1488 | |
1489 | return ret; | |
6e14eab9 NB |
1490 | free_skb: |
1491 | nlmsg_free(skb); | |
1492 | return ret; | |
7c9e7a6f AG |
1493 | } |
1494 | ||
de8c5221 | 1495 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 1496 | { |
7c9e7a6f AG |
1497 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
1498 | struct uio_info *info; | |
de8c5221 | 1499 | size_t size, used; |
7c9e7a6f AG |
1500 | char *str; |
1501 | ||
1502 | info = &udev->uio_info; | |
7c9e7a6f AG |
1503 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, |
1504 | udev->dev_config); | |
1505 | size += 1; /* for \0 */ | |
1506 | str = kmalloc(size, GFP_KERNEL); | |
1507 | if (!str) | |
1508 | return -ENOMEM; | |
1509 | ||
1510 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
7c9e7a6f AG |
1511 | if (udev->dev_config[0]) |
1512 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1513 | ||
ededd039 BL |
1514 | /* If the old string exists, free it */ |
1515 | kfree(info->name); | |
7c9e7a6f AG |
1516 | info->name = str; |
1517 | ||
de8c5221 BL |
1518 | return 0; |
1519 | } | |
1520 | ||
1521 | static int tcmu_configure_device(struct se_device *dev) | |
1522 | { | |
1523 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1524 | struct uio_info *info; | |
1525 | struct tcmu_mailbox *mb; | |
1526 | int ret = 0; | |
1527 | ||
1528 | ret = tcmu_update_uio_info(udev); | |
1529 | if (ret) | |
1530 | return ret; | |
1531 | ||
1532 | info = &udev->uio_info; | |
1533 | ||
141685a3 | 1534 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1535 | if (!udev->mb_addr) { |
1536 | ret = -ENOMEM; | |
1537 | goto err_vzalloc; | |
1538 | } | |
1539 | ||
1540 | /* mailbox fits in first part of CMDR space */ | |
1541 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1542 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1543 | udev->data_size = DATA_SIZE; |
b6df4b79 XL |
1544 | udev->dbi_thresh = 0; /* Default in Idle state */ |
1545 | udev->waiting_global = false; | |
7c9e7a6f | 1546 | |
141685a3 | 1547 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1548 | mb = udev->mb_addr; |
0ad46af8 | 1549 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1550 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1551 | mb->cmdr_off = CMDR_OFF; |
1552 | mb->cmdr_size = udev->cmdr_size; | |
1553 | ||
1554 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1555 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1556 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1557 | |
ac64a2ce | 1558 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1559 | |
1560 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1561 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1562 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1563 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1564 | |
1565 | info->irqcontrol = tcmu_irqcontrol; | |
1566 | info->irq = UIO_IRQ_CUSTOM; | |
1567 | ||
1568 | info->mmap = tcmu_mmap; | |
1569 | info->open = tcmu_open; | |
1570 | info->release = tcmu_release; | |
1571 | ||
1572 | ret = uio_register_device(tcmu_root_device, info); | |
1573 | if (ret) | |
1574 | goto err_register; | |
1575 | ||
81ee28de SY |
1576 | /* User can set hw_block_size before enable the device */ |
1577 | if (dev->dev_attrib.hw_block_size == 0) | |
1578 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1579 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1580 | if (!dev->dev_attrib.hw_max_sectors) |
1581 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
1582 | if (!dev->dev_attrib.emulate_write_cache) |
1583 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
1584 | dev->dev_attrib.hw_queue_depth = 128; |
1585 | ||
b849b456 KN |
1586 | /* If user didn't explicitly disable netlink reply support, use |
1587 | * module scope setting. | |
1588 | */ | |
1589 | if (udev->nl_reply_supported >= 0) | |
1590 | udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; | |
1591 | ||
f3cdbe39 MC |
1592 | /* |
1593 | * Get a ref incase userspace does a close on the uio device before | |
1594 | * LIO has initiated tcmu_free_device. | |
1595 | */ | |
1596 | kref_get(&udev->kref); | |
1597 | ||
b3af66e2 | 1598 | ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); |
7c9e7a6f AG |
1599 | if (ret) |
1600 | goto err_netlink; | |
1601 | ||
b6df4b79 XL |
1602 | mutex_lock(&root_udev_mutex); |
1603 | list_add(&udev->node, &root_udev); | |
1604 | mutex_unlock(&root_udev_mutex); | |
1605 | ||
7c9e7a6f AG |
1606 | return 0; |
1607 | ||
1608 | err_netlink: | |
f3cdbe39 | 1609 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1610 | uio_unregister_device(&udev->uio_info); |
1611 | err_register: | |
1612 | vfree(udev->mb_addr); | |
c22adc0b | 1613 | udev->mb_addr = NULL; |
7c9e7a6f AG |
1614 | err_vzalloc: |
1615 | kfree(info->name); | |
f3cdbe39 | 1616 | info->name = NULL; |
7c9e7a6f AG |
1617 | |
1618 | return ret; | |
1619 | } | |
1620 | ||
972c7f16 MC |
1621 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1622 | { | |
1623 | return udev->uio_info.uio_dev ? true : false; | |
1624 | } | |
1625 | ||
7c9e7a6f | 1626 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
1627 | { |
1628 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1629 | ||
1630 | /* release ref from init */ | |
1631 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1632 | } | |
1633 | ||
1634 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
1635 | { |
1636 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
7c9e7a6f AG |
1637 | |
1638 | del_timer_sync(&udev->timeout); | |
1639 | ||
b6df4b79 XL |
1640 | mutex_lock(&root_udev_mutex); |
1641 | list_del(&udev->node); | |
1642 | mutex_unlock(&root_udev_mutex); | |
1643 | ||
531283ff | 1644 | tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); |
7c9e7a6f | 1645 | |
531283ff | 1646 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
1647 | |
1648 | /* release ref from configure */ | |
1649 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
1650 | } |
1651 | ||
1652 | enum { | |
3abaa2bf | 1653 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
b849b456 | 1654 | Opt_nl_reply_supported, Opt_err, |
7c9e7a6f AG |
1655 | }; |
1656 | ||
1657 | static match_table_t tokens = { | |
1658 | {Opt_dev_config, "dev_config=%s"}, | |
1659 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1660 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1661 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
b849b456 | 1662 | {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
7c9e7a6f AG |
1663 | {Opt_err, NULL} |
1664 | }; | |
1665 | ||
3abaa2bf MC |
1666 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1667 | { | |
1668 | unsigned long tmp_ul; | |
1669 | char *arg_p; | |
1670 | int ret; | |
1671 | ||
1672 | arg_p = match_strdup(arg); | |
1673 | if (!arg_p) | |
1674 | return -ENOMEM; | |
1675 | ||
1676 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1677 | kfree(arg_p); | |
1678 | if (ret < 0) { | |
1679 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1680 | return ret; | |
1681 | } | |
1682 | if (!tmp_ul) { | |
1683 | pr_err("dev attrib must be nonzero\n"); | |
1684 | return -EINVAL; | |
1685 | } | |
1686 | *dev_attrib = tmp_ul; | |
1687 | return 0; | |
1688 | } | |
1689 | ||
7c9e7a6f AG |
1690 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1691 | const char *page, ssize_t count) | |
1692 | { | |
1693 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1694 | char *orig, *ptr, *opts, *arg_p; | |
1695 | substring_t args[MAX_OPT_ARGS]; | |
1696 | int ret = 0, token; | |
7c9e7a6f AG |
1697 | |
1698 | opts = kstrdup(page, GFP_KERNEL); | |
1699 | if (!opts) | |
1700 | return -ENOMEM; | |
1701 | ||
1702 | orig = opts; | |
1703 | ||
1704 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1705 | if (!*ptr) | |
1706 | continue; | |
1707 | ||
1708 | token = match_token(ptr, tokens, args); | |
1709 | switch (token) { | |
1710 | case Opt_dev_config: | |
1711 | if (match_strlcpy(udev->dev_config, &args[0], | |
1712 | TCMU_CONFIG_LEN) == 0) { | |
1713 | ret = -EINVAL; | |
1714 | break; | |
1715 | } | |
1716 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1717 | break; | |
1718 | case Opt_dev_size: | |
1719 | arg_p = match_strdup(&args[0]); | |
1720 | if (!arg_p) { | |
1721 | ret = -ENOMEM; | |
1722 | break; | |
1723 | } | |
1724 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1725 | kfree(arg_p); | |
1726 | if (ret < 0) | |
1727 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1728 | break; | |
9c1cd1b6 | 1729 | case Opt_hw_block_size: |
3abaa2bf MC |
1730 | ret = tcmu_set_dev_attrib(&args[0], |
1731 | &(dev->dev_attrib.hw_block_size)); | |
1732 | break; | |
1733 | case Opt_hw_max_sectors: | |
1734 | ret = tcmu_set_dev_attrib(&args[0], | |
1735 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1736 | break; |
b849b456 KN |
1737 | case Opt_nl_reply_supported: |
1738 | arg_p = match_strdup(&args[0]); | |
1739 | if (!arg_p) { | |
1740 | ret = -ENOMEM; | |
1741 | break; | |
1742 | } | |
16b93277 | 1743 | ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported); |
b849b456 KN |
1744 | kfree(arg_p); |
1745 | if (ret < 0) | |
16b93277 | 1746 | pr_err("kstrtoint() failed for nl_reply_supported=\n"); |
b849b456 | 1747 | break; |
7c9e7a6f AG |
1748 | default: |
1749 | break; | |
1750 | } | |
2579325c MC |
1751 | |
1752 | if (ret) | |
1753 | break; | |
7c9e7a6f AG |
1754 | } |
1755 | ||
1756 | kfree(orig); | |
1757 | return (!ret) ? count : ret; | |
1758 | } | |
1759 | ||
1760 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1761 | { | |
1762 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1763 | ssize_t bl = 0; | |
1764 | ||
1765 | bl = sprintf(b + bl, "Config: %s ", | |
1766 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1767 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1768 | |
1769 | return bl; | |
1770 | } | |
1771 | ||
1772 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1773 | { | |
1774 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1775 | ||
1776 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1777 | dev->dev_attrib.block_size); | |
1778 | } | |
1779 | ||
7c9e7a6f | 1780 | static sense_reason_t |
9c1cd1b6 | 1781 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1782 | { |
02eb924f | 1783 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1784 | } |
1785 | ||
7d7a7435 NB |
1786 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1787 | { | |
1788 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1789 | struct se_dev_attrib, da_group); | |
b5ab697c | 1790 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
7d7a7435 NB |
1791 | |
1792 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1793 | } | |
1794 | ||
1795 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1796 | size_t count) | |
1797 | { | |
1798 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1799 | struct se_dev_attrib, da_group); | |
1800 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1801 | struct tcmu_dev, se_dev); | |
1802 | u32 val; | |
1803 | int ret; | |
1804 | ||
1805 | if (da->da_dev->export_count) { | |
1806 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1807 | return -EINVAL; | |
1808 | } | |
1809 | ||
1810 | ret = kstrtou32(page, 0, &val); | |
1811 | if (ret < 0) | |
1812 | return ret; | |
1813 | ||
7d7a7435 NB |
1814 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1815 | return count; | |
1816 | } | |
1817 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1818 | ||
2d76443e | 1819 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
1820 | { |
1821 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1822 | struct se_dev_attrib, da_group); | |
1823 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1824 | ||
1825 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
1826 | } | |
1827 | ||
2d76443e MC |
1828 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
1829 | size_t count) | |
ee018252 BL |
1830 | { |
1831 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1832 | struct se_dev_attrib, da_group); | |
1833 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1834 | int ret, len; |
ee018252 | 1835 | |
2d76443e MC |
1836 | len = strlen(page); |
1837 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 1838 | return -EINVAL; |
ee018252 BL |
1839 | |
1840 | /* Check if device has been configured before */ | |
1841 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1842 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1843 | TCMU_ATTR_DEV_CFG, page); |
ee018252 BL |
1844 | if (ret) { |
1845 | pr_err("Unable to reconfigure device\n"); | |
1846 | return ret; | |
1847 | } | |
de8c5221 BL |
1848 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
1849 | ||
1850 | ret = tcmu_update_uio_info(udev); | |
1851 | if (ret) | |
1852 | return ret; | |
1853 | return count; | |
ee018252 | 1854 | } |
2d76443e | 1855 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
1856 | |
1857 | return count; | |
1858 | } | |
2d76443e | 1859 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 1860 | |
801fc54d BL |
1861 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
1862 | { | |
1863 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1864 | struct se_dev_attrib, da_group); | |
1865 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1866 | ||
1867 | return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); | |
1868 | } | |
1869 | ||
1870 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, | |
1871 | size_t count) | |
1872 | { | |
1873 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1874 | struct se_dev_attrib, da_group); | |
1875 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1876 | u64 val; |
801fc54d BL |
1877 | int ret; |
1878 | ||
2d76443e | 1879 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
1880 | if (ret < 0) |
1881 | return ret; | |
801fc54d BL |
1882 | |
1883 | /* Check if device has been configured before */ | |
1884 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1885 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1886 | TCMU_ATTR_DEV_SIZE, &val); |
801fc54d BL |
1887 | if (ret) { |
1888 | pr_err("Unable to reconfigure device\n"); | |
1889 | return ret; | |
1890 | } | |
1891 | } | |
2d76443e | 1892 | udev->dev_size = val; |
801fc54d BL |
1893 | return count; |
1894 | } | |
1895 | CONFIGFS_ATTR(tcmu_, dev_size); | |
1896 | ||
b849b456 KN |
1897 | static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
1898 | char *page) | |
1899 | { | |
1900 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1901 | struct se_dev_attrib, da_group); | |
1902 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1903 | ||
1904 | return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); | |
1905 | } | |
1906 | ||
1907 | static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, | |
1908 | const char *page, size_t count) | |
1909 | { | |
1910 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1911 | struct se_dev_attrib, da_group); | |
1912 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1913 | s8 val; | |
1914 | int ret; | |
1915 | ||
1916 | ret = kstrtos8(page, 0, &val); | |
1917 | if (ret < 0) | |
1918 | return ret; | |
1919 | ||
1920 | udev->nl_reply_supported = val; | |
1921 | return count; | |
1922 | } | |
1923 | CONFIGFS_ATTR(tcmu_, nl_reply_supported); | |
1924 | ||
9a8bb606 BL |
1925 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
1926 | char *page) | |
1927 | { | |
1928 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1929 | struct se_dev_attrib, da_group); | |
1930 | ||
1931 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
1932 | } | |
1933 | ||
1934 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, | |
1935 | const char *page, size_t count) | |
1936 | { | |
1937 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1938 | struct se_dev_attrib, da_group); | |
1068be7b | 1939 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 1940 | u8 val; |
9a8bb606 BL |
1941 | int ret; |
1942 | ||
2d76443e | 1943 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
1944 | if (ret < 0) |
1945 | return ret; | |
1946 | ||
1068be7b BL |
1947 | /* Check if device has been configured before */ |
1948 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1949 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1950 | TCMU_ATTR_WRITECACHE, &val); |
1068be7b BL |
1951 | if (ret) { |
1952 | pr_err("Unable to reconfigure device\n"); | |
1953 | return ret; | |
1954 | } | |
1955 | } | |
2d76443e MC |
1956 | |
1957 | da->emulate_write_cache = val; | |
9a8bb606 BL |
1958 | return count; |
1959 | } | |
1960 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
1961 | ||
5821783b | 1962 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 1963 | &tcmu_attr_cmd_time_out, |
2d76443e | 1964 | &tcmu_attr_dev_config, |
801fc54d BL |
1965 | &tcmu_attr_dev_size, |
1966 | &tcmu_attr_emulate_write_cache, | |
b849b456 | 1967 | &tcmu_attr_nl_reply_supported, |
801fc54d BL |
1968 | NULL, |
1969 | }; | |
1970 | ||
7d7a7435 NB |
1971 | static struct configfs_attribute **tcmu_attrs; |
1972 | ||
1973 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1974 | .name = "user", |
7c9e7a6f | 1975 | .owner = THIS_MODULE, |
a3541703 | 1976 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1977 | .attach_hba = tcmu_attach_hba, |
1978 | .detach_hba = tcmu_detach_hba, | |
1979 | .alloc_device = tcmu_alloc_device, | |
1980 | .configure_device = tcmu_configure_device, | |
92634706 | 1981 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
1982 | .free_device = tcmu_free_device, |
1983 | .parse_cdb = tcmu_parse_cdb, | |
1984 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1985 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1986 | .get_device_type = sbc_get_device_type, | |
1987 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1988 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1989 | }; |
1990 | ||
b6df4b79 XL |
1991 | static int unmap_thread_fn(void *data) |
1992 | { | |
1993 | struct tcmu_dev *udev; | |
1994 | loff_t off; | |
1995 | uint32_t start, end, block; | |
1996 | struct page *page; | |
1997 | int i; | |
1998 | ||
07932a02 | 1999 | while (!kthread_should_stop()) { |
b6df4b79 XL |
2000 | DEFINE_WAIT(__wait); |
2001 | ||
2002 | prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); | |
2003 | schedule(); | |
2004 | finish_wait(&unmap_wait, &__wait); | |
2005 | ||
d906d8af MC |
2006 | if (kthread_should_stop()) |
2007 | break; | |
2008 | ||
b6df4b79 XL |
2009 | mutex_lock(&root_udev_mutex); |
2010 | list_for_each_entry(udev, &root_udev, node) { | |
2011 | mutex_lock(&udev->cmdr_lock); | |
2012 | ||
2013 | /* Try to complete the finished commands first */ | |
2014 | tcmu_handle_completions(udev); | |
2015 | ||
2016 | /* Skip the udevs waiting the global pool or in idle */ | |
2017 | if (udev->waiting_global || !udev->dbi_thresh) { | |
2018 | mutex_unlock(&udev->cmdr_lock); | |
2019 | continue; | |
2020 | } | |
2021 | ||
2022 | end = udev->dbi_max + 1; | |
2023 | block = find_last_bit(udev->data_bitmap, end); | |
2024 | if (block == udev->dbi_max) { | |
2025 | /* | |
2026 | * The last bit is dbi_max, so there is | |
2027 | * no need to shrink any blocks. | |
2028 | */ | |
2029 | mutex_unlock(&udev->cmdr_lock); | |
2030 | continue; | |
2031 | } else if (block == end) { | |
2032 | /* The current udev will goto idle state */ | |
2033 | udev->dbi_thresh = start = 0; | |
2034 | udev->dbi_max = 0; | |
2035 | } else { | |
2036 | udev->dbi_thresh = start = block + 1; | |
2037 | udev->dbi_max = block; | |
2038 | } | |
2039 | ||
2040 | /* Here will truncate the data area from off */ | |
2041 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
2042 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
2043 | ||
2044 | /* Release the block pages */ | |
2045 | for (i = start; i < end; i++) { | |
2046 | page = radix_tree_delete(&udev->data_blocks, i); | |
2047 | if (page) { | |
2048 | __free_page(page); | |
2049 | atomic_dec(&global_db_count); | |
2050 | } | |
2051 | } | |
2052 | mutex_unlock(&udev->cmdr_lock); | |
2053 | } | |
2054 | ||
2055 | /* | |
2056 | * Try to wake up the udevs who are waiting | |
2057 | * for the global data pool. | |
2058 | */ | |
2059 | list_for_each_entry(udev, &root_udev, node) { | |
2060 | if (udev->waiting_global) | |
2061 | wake_up(&udev->wait_cmdr); | |
2062 | } | |
2063 | mutex_unlock(&root_udev_mutex); | |
2064 | } | |
2065 | ||
2066 | return 0; | |
2067 | } | |
2068 | ||
7c9e7a6f AG |
2069 | static int __init tcmu_module_init(void) |
2070 | { | |
801fc54d | 2071 | int ret, i, k, len = 0; |
7c9e7a6f AG |
2072 | |
2073 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
2074 | ||
2075 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
2076 | sizeof(struct tcmu_cmd), | |
2077 | __alignof__(struct tcmu_cmd), | |
2078 | 0, NULL); | |
2079 | if (!tcmu_cmd_cache) | |
2080 | return -ENOMEM; | |
2081 | ||
2082 | tcmu_root_device = root_device_register("tcm_user"); | |
2083 | if (IS_ERR(tcmu_root_device)) { | |
2084 | ret = PTR_ERR(tcmu_root_device); | |
2085 | goto out_free_cache; | |
2086 | } | |
2087 | ||
2088 | ret = genl_register_family(&tcmu_genl_family); | |
2089 | if (ret < 0) { | |
2090 | goto out_unreg_device; | |
2091 | } | |
2092 | ||
7d7a7435 NB |
2093 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
2094 | len += sizeof(struct configfs_attribute *); | |
2095 | } | |
801fc54d BL |
2096 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { |
2097 | len += sizeof(struct configfs_attribute *); | |
2098 | } | |
2099 | len += sizeof(struct configfs_attribute *); | |
7d7a7435 NB |
2100 | |
2101 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
2102 | if (!tcmu_attrs) { | |
2103 | ret = -ENOMEM; | |
2104 | goto out_unreg_genl; | |
2105 | } | |
2106 | ||
2107 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
2108 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
2109 | } | |
801fc54d BL |
2110 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { |
2111 | tcmu_attrs[i] = tcmu_attrib_attrs[k]; | |
2112 | i++; | |
2113 | } | |
7d7a7435 NB |
2114 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
2115 | ||
0a06d430 | 2116 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 2117 | if (ret) |
7d7a7435 | 2118 | goto out_attrs; |
7c9e7a6f | 2119 | |
b6df4b79 XL |
2120 | init_waitqueue_head(&unmap_wait); |
2121 | unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); | |
2122 | if (IS_ERR(unmap_thread)) { | |
2123 | ret = PTR_ERR(unmap_thread); | |
2124 | goto out_unreg_transport; | |
2125 | } | |
2126 | ||
7c9e7a6f AG |
2127 | return 0; |
2128 | ||
b6df4b79 XL |
2129 | out_unreg_transport: |
2130 | target_backend_unregister(&tcmu_ops); | |
7d7a7435 NB |
2131 | out_attrs: |
2132 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
2133 | out_unreg_genl: |
2134 | genl_unregister_family(&tcmu_genl_family); | |
2135 | out_unreg_device: | |
2136 | root_device_unregister(tcmu_root_device); | |
2137 | out_free_cache: | |
2138 | kmem_cache_destroy(tcmu_cmd_cache); | |
2139 | ||
2140 | return ret; | |
2141 | } | |
2142 | ||
2143 | static void __exit tcmu_module_exit(void) | |
2144 | { | |
b6df4b79 | 2145 | kthread_stop(unmap_thread); |
0a06d430 | 2146 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 2147 | kfree(tcmu_attrs); |
7c9e7a6f AG |
2148 | genl_unregister_family(&tcmu_genl_family); |
2149 | root_device_unregister(tcmu_root_device); | |
2150 | kmem_cache_destroy(tcmu_cmd_cache); | |
2151 | } | |
2152 | ||
2153 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
2154 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
2155 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
2156 | MODULE_LICENSE("GPL"); | |
2157 | ||
2158 | module_init(tcmu_module_init); | |
2159 | module_exit(tcmu_module_exit); |