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a61127c2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7c9e7a6f AG |
2 | /* |
3 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
4 | * Copyright (C) 2014 Red Hat, Inc. | |
f97ec7db | 5 | * Copyright (C) 2015 Arrikto, Inc. |
141685a3 | 6 | * Copyright (C) 2017 Chinamobile, Inc. |
7c9e7a6f AG |
7 | */ |
8 | ||
9 | #include <linux/spinlock.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/idr.h> | |
ba929992 | 12 | #include <linux/kernel.h> |
7c9e7a6f AG |
13 | #include <linux/timer.h> |
14 | #include <linux/parser.h> | |
5538d294 | 15 | #include <linux/vmalloc.h> |
7c9e7a6f | 16 | #include <linux/uio_driver.h> |
141685a3 | 17 | #include <linux/radix-tree.h> |
ac64a2ce | 18 | #include <linux/stringify.h> |
26418649 | 19 | #include <linux/bitops.h> |
f5045724 | 20 | #include <linux/highmem.h> |
7d7a7435 | 21 | #include <linux/configfs.h> |
b6df4b79 | 22 | #include <linux/mutex.h> |
9972cebb | 23 | #include <linux/workqueue.h> |
7c9e7a6f | 24 | #include <net/genetlink.h> |
ba929992 BVA |
25 | #include <scsi/scsi_common.h> |
26 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
27 | #include <target/target_core_base.h> |
28 | #include <target/target_core_fabric.h> | |
29 | #include <target/target_core_backend.h> | |
e9f720d6 | 30 | |
7c9e7a6f AG |
31 | #include <linux/target_core_user.h> |
32 | ||
572ccdab RD |
33 | /** |
34 | * DOC: Userspace I/O | |
35 | * Userspace I/O | |
36 | * ------------- | |
37 | * | |
7c9e7a6f AG |
38 | * Define a shared-memory interface for LIO to pass SCSI commands and |
39 | * data to userspace for processing. This is to allow backends that | |
40 | * are too complex for in-kernel support to be possible. | |
41 | * | |
42 | * It uses the UIO framework to do a lot of the device-creation and | |
43 | * introspection work for us. | |
44 | * | |
45 | * See the .h file for how the ring is laid out. Note that while the | |
46 | * command ring is defined, the particulars of the data area are | |
47 | * not. Offset values in the command entry point to other locations | |
572ccdab | 48 | * internal to the mmap-ed area. There is separate space outside the |
7c9e7a6f AG |
49 | * command ring for data buffers. This leaves maximum flexibility for |
50 | * moving buffer allocations, or even page flipping or other | |
51 | * allocation techniques, without altering the command ring layout. | |
52 | * | |
53 | * SECURITY: | |
54 | * The user process must be assumed to be malicious. There's no way to | |
55 | * prevent it breaking the command ring protocol if it wants, but in | |
56 | * order to prevent other issues we must only ever read *data* from | |
57 | * the shared memory area, not offsets or sizes. This applies to | |
58 | * command ring entries as well as the mailbox. Extra code needed for | |
59 | * this may have a 'UAM' comment. | |
60 | */ | |
61 | ||
7c9e7a6f AG |
62 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
63 | ||
b6df4b79 XL |
64 | /* For cmd area, the size is fixed 8MB */ |
65 | #define CMDR_SIZE (8 * 1024 * 1024) | |
26418649 | 66 | |
b6df4b79 XL |
67 | /* |
68 | * For data area, the block size is PAGE_SIZE and | |
69 | * the total size is 256K * PAGE_SIZE. | |
70 | */ | |
71 | #define DATA_BLOCK_SIZE PAGE_SIZE | |
80eb8761 MC |
72 | #define DATA_BLOCK_SHIFT PAGE_SHIFT |
73 | #define DATA_BLOCK_BITS_DEF (256 * 1024) | |
7c9e7a6f | 74 | |
80eb8761 MC |
75 | #define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT)) |
76 | #define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT)) | |
77 | ||
af1dd7ff MC |
78 | /* |
79 | * Default number of global data blocks(512K * PAGE_SIZE) | |
80 | * when the unmap thread will be started. | |
81 | */ | |
80eb8761 | 82 | #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) |
b6df4b79 | 83 | |
b3af66e2 | 84 | static u8 tcmu_kern_cmd_reply_supported; |
bdaeedc1 | 85 | static u8 tcmu_netlink_blocked; |
b3af66e2 | 86 | |
7c9e7a6f AG |
87 | static struct device *tcmu_root_device; |
88 | ||
89 | struct tcmu_hba { | |
90 | u32 host_id; | |
91 | }; | |
92 | ||
7c9e7a6f AG |
93 | #define TCMU_CONFIG_LEN 256 |
94 | ||
3228691f MC |
95 | static DEFINE_MUTEX(tcmu_nl_cmd_mutex); |
96 | static LIST_HEAD(tcmu_nl_cmd_list); | |
97 | ||
98 | struct tcmu_dev; | |
99 | ||
b3af66e2 MC |
100 | struct tcmu_nl_cmd { |
101 | /* wake up thread waiting for reply */ | |
102 | struct completion complete; | |
3228691f MC |
103 | struct list_head nl_list; |
104 | struct tcmu_dev *udev; | |
b3af66e2 MC |
105 | int cmd; |
106 | int status; | |
107 | }; | |
108 | ||
7c9e7a6f | 109 | struct tcmu_dev { |
b6df4b79 | 110 | struct list_head node; |
f3cdbe39 | 111 | struct kref kref; |
af1dd7ff | 112 | |
7c9e7a6f AG |
113 | struct se_device se_dev; |
114 | ||
115 | char *name; | |
116 | struct se_hba *hba; | |
117 | ||
118 | #define TCMU_DEV_BIT_OPEN 0 | |
119 | #define TCMU_DEV_BIT_BROKEN 1 | |
892782ca | 120 | #define TCMU_DEV_BIT_BLOCKED 2 |
59526d7a | 121 | #define TCMU_DEV_BIT_TMR_NOTIFY 3 |
7c9e7a6f | 122 | unsigned long flags; |
7c9e7a6f AG |
123 | |
124 | struct uio_info uio_info; | |
125 | ||
b6df4b79 XL |
126 | struct inode *inode; |
127 | ||
7c9e7a6f | 128 | struct tcmu_mailbox *mb_addr; |
0e0d7526 | 129 | uint64_t dev_size; |
7c9e7a6f AG |
130 | u32 cmdr_size; |
131 | u32 cmdr_last_cleaned; | |
3d9b9555 | 132 | /* Offset of data area from start of mb */ |
26418649 | 133 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f AG |
134 | size_t data_off; |
135 | size_t data_size; | |
80eb8761 MC |
136 | uint32_t max_blocks; |
137 | size_t ring_size; | |
26418649 | 138 | |
b6df4b79 | 139 | struct mutex cmdr_lock; |
a94a2572 | 140 | struct list_head qfull_queue; |
bc2d214a | 141 | struct list_head tmr_queue; |
7c9e7a6f | 142 | |
141685a3 | 143 | uint32_t dbi_max; |
b6df4b79 | 144 | uint32_t dbi_thresh; |
80eb8761 | 145 | unsigned long *data_bitmap; |
141685a3 XL |
146 | struct radix_tree_root data_blocks; |
147 | ||
7c9e7a6f | 148 | struct idr commands; |
7c9e7a6f | 149 | |
9103575a | 150 | struct timer_list cmd_timer; |
af980e46 | 151 | unsigned int cmd_time_out; |
a94a2572 | 152 | struct list_head inflight_queue; |
9103575a MC |
153 | |
154 | struct timer_list qfull_timer; | |
155 | int qfull_time_out; | |
156 | ||
488ebe4c | 157 | struct list_head timedout_entry; |
7c9e7a6f | 158 | |
b3af66e2 | 159 | struct tcmu_nl_cmd curr_nl_cmd; |
b3af66e2 | 160 | |
7c9e7a6f | 161 | char dev_config[TCMU_CONFIG_LEN]; |
b849b456 KN |
162 | |
163 | int nl_reply_supported; | |
7c9e7a6f AG |
164 | }; |
165 | ||
166 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
167 | ||
168 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
169 | ||
170 | struct tcmu_cmd { | |
171 | struct se_cmd *se_cmd; | |
172 | struct tcmu_dev *tcmu_dev; | |
a94a2572 | 173 | struct list_head queue_entry; |
7c9e7a6f AG |
174 | |
175 | uint16_t cmd_id; | |
176 | ||
26418649 | 177 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 178 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
179 | uint32_t dbi_cnt; |
180 | uint32_t dbi_cur; | |
181 | uint32_t *dbi; | |
7c9e7a6f AG |
182 | |
183 | unsigned long deadline; | |
184 | ||
185 | #define TCMU_CMD_BIT_EXPIRED 0 | |
186 | unsigned long flags; | |
187 | }; | |
bc2d214a BS |
188 | |
189 | struct tcmu_tmr { | |
190 | struct list_head queue_entry; | |
191 | ||
192 | uint8_t tmr_type; | |
193 | uint32_t tmr_cmd_cnt; | |
194 | int16_t tmr_cmd_ids[0]; | |
195 | }; | |
196 | ||
af1dd7ff MC |
197 | /* |
198 | * To avoid dead lock the mutex lock order should always be: | |
199 | * | |
200 | * mutex_lock(&root_udev_mutex); | |
201 | * ... | |
202 | * mutex_lock(&tcmu_dev->cmdr_lock); | |
203 | * mutex_unlock(&tcmu_dev->cmdr_lock); | |
204 | * ... | |
205 | * mutex_unlock(&root_udev_mutex); | |
206 | */ | |
b6df4b79 XL |
207 | static DEFINE_MUTEX(root_udev_mutex); |
208 | static LIST_HEAD(root_udev); | |
209 | ||
488ebe4c MC |
210 | static DEFINE_SPINLOCK(timed_out_udevs_lock); |
211 | static LIST_HEAD(timed_out_udevs); | |
212 | ||
80eb8761 MC |
213 | static struct kmem_cache *tcmu_cmd_cache; |
214 | ||
b6df4b79 | 215 | static atomic_t global_db_count = ATOMIC_INIT(0); |
af1dd7ff | 216 | static struct delayed_work tcmu_unmap_work; |
80eb8761 | 217 | static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF; |
b6df4b79 | 218 | |
80eb8761 MC |
219 | static int tcmu_set_global_max_data_area(const char *str, |
220 | const struct kernel_param *kp) | |
221 | { | |
222 | int ret, max_area_mb; | |
223 | ||
224 | ret = kstrtoint(str, 10, &max_area_mb); | |
225 | if (ret) | |
226 | return -EINVAL; | |
227 | ||
228 | if (max_area_mb <= 0) { | |
229 | pr_err("global_max_data_area must be larger than 0.\n"); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb); | |
234 | if (atomic_read(&global_db_count) > tcmu_global_max_blocks) | |
235 | schedule_delayed_work(&tcmu_unmap_work, 0); | |
236 | else | |
237 | cancel_delayed_work_sync(&tcmu_unmap_work); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int tcmu_get_global_max_data_area(char *buffer, | |
243 | const struct kernel_param *kp) | |
244 | { | |
245 | return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); | |
246 | } | |
247 | ||
248 | static const struct kernel_param_ops tcmu_global_max_data_area_op = { | |
249 | .set = tcmu_set_global_max_data_area, | |
250 | .get = tcmu_get_global_max_data_area, | |
251 | }; | |
252 | ||
253 | module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, | |
254 | S_IWUSR | S_IRUGO); | |
255 | MODULE_PARM_DESC(global_max_data_area_mb, | |
256 | "Max MBs allowed to be allocated to all the tcmu device's " | |
257 | "data areas."); | |
7c9e7a6f | 258 | |
bdaeedc1 MC |
259 | static int tcmu_get_block_netlink(char *buffer, |
260 | const struct kernel_param *kp) | |
261 | { | |
262 | return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? | |
263 | "blocked" : "unblocked"); | |
264 | } | |
265 | ||
266 | static int tcmu_set_block_netlink(const char *str, | |
267 | const struct kernel_param *kp) | |
268 | { | |
269 | int ret; | |
270 | u8 val; | |
271 | ||
272 | ret = kstrtou8(str, 0, &val); | |
273 | if (ret < 0) | |
274 | return ret; | |
275 | ||
276 | if (val > 1) { | |
277 | pr_err("Invalid block netlink value %u\n", val); | |
278 | return -EINVAL; | |
279 | } | |
280 | ||
281 | tcmu_netlink_blocked = val; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static const struct kernel_param_ops tcmu_block_netlink_op = { | |
286 | .set = tcmu_set_block_netlink, | |
287 | .get = tcmu_get_block_netlink, | |
288 | }; | |
289 | ||
290 | module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); | |
291 | MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); | |
292 | ||
293 | static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) | |
294 | { | |
295 | struct tcmu_dev *udev = nl_cmd->udev; | |
296 | ||
297 | if (!tcmu_netlink_blocked) { | |
298 | pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); | |
299 | return -EBUSY; | |
300 | } | |
301 | ||
302 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
303 | pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); | |
304 | nl_cmd->status = -EINTR; | |
305 | list_del(&nl_cmd->nl_list); | |
306 | complete(&nl_cmd->complete); | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int tcmu_set_reset_netlink(const char *str, | |
312 | const struct kernel_param *kp) | |
313 | { | |
314 | struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; | |
315 | int ret; | |
316 | u8 val; | |
317 | ||
318 | ret = kstrtou8(str, 0, &val); | |
319 | if (ret < 0) | |
320 | return ret; | |
321 | ||
322 | if (val != 1) { | |
323 | pr_err("Invalid reset netlink value %u\n", val); | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | mutex_lock(&tcmu_nl_cmd_mutex); | |
328 | list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { | |
329 | ret = tcmu_fail_netlink_cmd(nl_cmd); | |
330 | if (ret) | |
331 | break; | |
332 | } | |
333 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
338 | static const struct kernel_param_ops tcmu_reset_netlink_op = { | |
339 | .set = tcmu_set_reset_netlink, | |
340 | }; | |
341 | ||
342 | module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); | |
343 | MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); | |
344 | ||
7c9e7a6f AG |
345 | /* multicast group */ |
346 | enum tcmu_multicast_groups { | |
347 | TCMU_MCGRP_CONFIG, | |
348 | }; | |
349 | ||
350 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
351 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
352 | }; | |
353 | ||
b3af66e2 MC |
354 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
355 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
356 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
357 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
358 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
359 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
360 | }; | |
361 | ||
362 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
363 | { | |
3228691f | 364 | struct tcmu_dev *udev = NULL; |
b3af66e2 MC |
365 | struct tcmu_nl_cmd *nl_cmd; |
366 | int dev_id, rc, ret = 0; | |
b3af66e2 MC |
367 | |
368 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
369 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
370 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
9554c1be | 371 | return -EINVAL; |
b3af66e2 MC |
372 | } |
373 | ||
374 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
375 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
376 | ||
3228691f MC |
377 | mutex_lock(&tcmu_nl_cmd_mutex); |
378 | list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { | |
379 | if (nl_cmd->udev->se_dev.dev_index == dev_id) { | |
380 | udev = nl_cmd->udev; | |
381 | break; | |
382 | } | |
b3af66e2 | 383 | } |
b3af66e2 | 384 | |
3228691f | 385 | if (!udev) { |
0c218e16 | 386 | pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", |
3228691f MC |
387 | completed_cmd, rc, dev_id); |
388 | ret = -ENODEV; | |
389 | goto unlock; | |
390 | } | |
391 | list_del(&nl_cmd->nl_list); | |
b3af66e2 | 392 | |
bdaeedc1 MC |
393 | pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", |
394 | udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, | |
395 | nl_cmd->status); | |
b3af66e2 MC |
396 | |
397 | if (nl_cmd->cmd != completed_cmd) { | |
3228691f MC |
398 | pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", |
399 | udev->name, completed_cmd, nl_cmd->cmd); | |
b3af66e2 | 400 | ret = -EINVAL; |
3228691f | 401 | goto unlock; |
b3af66e2 MC |
402 | } |
403 | ||
3228691f MC |
404 | nl_cmd->status = rc; |
405 | complete(&nl_cmd->complete); | |
406 | unlock: | |
407 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
b3af66e2 MC |
408 | return ret; |
409 | } | |
410 | ||
411 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
412 | { | |
413 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
414 | } | |
415 | ||
416 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
417 | { | |
418 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
419 | } | |
420 | ||
421 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
422 | struct genl_info *info) | |
423 | { | |
424 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
425 | } | |
426 | ||
427 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
428 | { | |
429 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
430 | tcmu_kern_cmd_reply_supported = | |
431 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
432 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
433 | tcmu_kern_cmd_reply_supported); | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | static const struct genl_ops tcmu_genl_ops[] = { | |
440 | { | |
441 | .cmd = TCMU_CMD_SET_FEATURES, | |
ef6243ac | 442 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 443 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
444 | .doit = tcmu_genl_set_features, |
445 | }, | |
446 | { | |
447 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
ef6243ac | 448 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 449 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
450 | .doit = tcmu_genl_add_dev_done, |
451 | }, | |
452 | { | |
453 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
ef6243ac | 454 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 455 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
456 | .doit = tcmu_genl_rm_dev_done, |
457 | }, | |
458 | { | |
459 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
ef6243ac | 460 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 461 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
462 | .doit = tcmu_genl_reconfig_dev_done, |
463 | }, | |
464 | }; | |
465 | ||
7c9e7a6f | 466 | /* Our generic netlink family */ |
56989f6d | 467 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 468 | .module = THIS_MODULE, |
7c9e7a6f AG |
469 | .hdrsize = 0, |
470 | .name = "TCM-USER", | |
b3af66e2 | 471 | .version = 2, |
7c9e7a6f | 472 | .maxattr = TCMU_ATTR_MAX, |
3b0f31f2 | 473 | .policy = tcmu_attr_policy, |
7c9e7a6f AG |
474 | .mcgrps = tcmu_mcgrps, |
475 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 476 | .netnsok = true, |
b3af66e2 MC |
477 | .ops = tcmu_genl_ops, |
478 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
479 | }; |
480 | ||
141685a3 XL |
481 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
482 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
483 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
484 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
485 | ||
b6df4b79 | 486 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
487 | { |
488 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
489 | uint32_t i; | |
490 | ||
b6df4b79 | 491 | for (i = 0; i < len; i++) |
141685a3 XL |
492 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
493 | } | |
494 | ||
b6df4b79 XL |
495 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
496 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 497 | { |
b6df4b79 XL |
498 | struct page *page; |
499 | int ret, dbi; | |
141685a3 | 500 | |
b6df4b79 XL |
501 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
502 | if (dbi == udev->dbi_thresh) | |
503 | return false; | |
141685a3 | 504 | |
b6df4b79 XL |
505 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
506 | if (!page) { | |
b6df4b79 | 507 | if (atomic_add_return(1, &global_db_count) > |
80eb8761 | 508 | tcmu_global_max_blocks) |
af1dd7ff | 509 | schedule_delayed_work(&tcmu_unmap_work, 0); |
141685a3 | 510 | |
b6df4b79 | 511 | /* try to get new page from the mm */ |
0eccce86 | 512 | page = alloc_page(GFP_NOIO); |
b6df4b79 | 513 | if (!page) |
daf78c30 | 514 | goto err_alloc; |
b6df4b79 XL |
515 | |
516 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
daf78c30 XL |
517 | if (ret) |
518 | goto err_insert; | |
141685a3 XL |
519 | } |
520 | ||
b6df4b79 XL |
521 | if (dbi > udev->dbi_max) |
522 | udev->dbi_max = dbi; | |
523 | ||
524 | set_bit(dbi, udev->data_bitmap); | |
525 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
526 | ||
527 | return true; | |
daf78c30 XL |
528 | err_insert: |
529 | __free_page(page); | |
530 | err_alloc: | |
531 | atomic_dec(&global_db_count); | |
532 | return false; | |
141685a3 XL |
533 | } |
534 | ||
b6df4b79 XL |
535 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
536 | struct tcmu_cmd *tcmu_cmd) | |
537 | { | |
538 | int i; | |
539 | ||
b6df4b79 XL |
540 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { |
541 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
af1dd7ff | 542 | return false; |
b6df4b79 XL |
543 | } |
544 | return true; | |
b6df4b79 XL |
545 | } |
546 | ||
547 | static inline struct page * | |
548 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
549 | { |
550 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
551 | } | |
552 | ||
553 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
554 | { | |
a3512902 BS |
555 | if (tcmu_cmd->se_cmd) |
556 | tcmu_cmd->se_cmd->priv = NULL; | |
141685a3 XL |
557 | kfree(tcmu_cmd->dbi); |
558 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
559 | } | |
560 | ||
561 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
562 | { | |
563 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
564 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
565 | ||
566 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
567 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
568 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
569 | DATA_BLOCK_SIZE); | |
570 | } | |
571 | ||
572 | return data_length; | |
573 | } | |
574 | ||
575 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
576 | { | |
577 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
578 | ||
579 | return data_length / DATA_BLOCK_SIZE; | |
580 | } | |
581 | ||
7c9e7a6f AG |
582 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
583 | { | |
584 | struct se_device *se_dev = se_cmd->se_dev; | |
585 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
586 | struct tcmu_cmd *tcmu_cmd; | |
7c9e7a6f | 587 | |
0eccce86 | 588 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); |
7c9e7a6f AG |
589 | if (!tcmu_cmd) |
590 | return NULL; | |
591 | ||
a94a2572 | 592 | INIT_LIST_HEAD(&tcmu_cmd->queue_entry); |
7c9e7a6f AG |
593 | tcmu_cmd->se_cmd = se_cmd; |
594 | tcmu_cmd->tcmu_dev = udev; | |
7c9e7a6f | 595 | |
141685a3 XL |
596 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
597 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
598 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
0eccce86 | 599 | GFP_NOIO); |
141685a3 XL |
600 | if (!tcmu_cmd->dbi) { |
601 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
602 | return NULL; | |
603 | } | |
604 | ||
7c9e7a6f AG |
605 | return tcmu_cmd; |
606 | } | |
607 | ||
608 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
609 | { | |
b75d8063 | 610 | unsigned long offset = offset_in_page(vaddr); |
26d2b310 | 611 | void *start = vaddr - offset; |
7c9e7a6f AG |
612 | |
613 | size = round_up(size+offset, PAGE_SIZE); | |
7c9e7a6f AG |
614 | |
615 | while (size) { | |
3145550a | 616 | flush_dcache_page(vmalloc_to_page(start)); |
26d2b310 | 617 | start += PAGE_SIZE; |
7c9e7a6f AG |
618 | size -= PAGE_SIZE; |
619 | } | |
620 | } | |
621 | ||
622 | /* | |
623 | * Some ring helper functions. We don't assume size is a power of 2 so | |
624 | * we can't use circ_buf.h. | |
625 | */ | |
626 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
627 | { | |
628 | int diff = head - tail; | |
629 | ||
630 | if (diff >= 0) | |
631 | return diff; | |
632 | else | |
633 | return size + diff; | |
634 | } | |
635 | ||
636 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
637 | { | |
638 | /* Keep 1 byte unused or we can't tell full from empty */ | |
639 | return (size - spc_used(head, tail, size) - 1); | |
640 | } | |
641 | ||
642 | static inline size_t head_to_end(size_t head, size_t size) | |
643 | { | |
644 | return size - head; | |
645 | } | |
646 | ||
3e609135 | 647 | static inline void new_iov(struct iovec **iov, int *iov_cnt) |
f1dbd087 SY |
648 | { |
649 | struct iovec *iovec; | |
650 | ||
651 | if (*iov_cnt != 0) | |
652 | (*iov)++; | |
653 | (*iov_cnt)++; | |
654 | ||
655 | iovec = *iov; | |
656 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
657 | } |
658 | ||
7c9e7a6f AG |
659 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
660 | ||
26418649 | 661 | /* offset is relative to mb_addr */ |
141685a3 XL |
662 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
663 | int dbi, int remaining) | |
26418649 | 664 | { |
141685a3 | 665 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
666 | DATA_BLOCK_SIZE - remaining; |
667 | } | |
668 | ||
daf78c30 | 669 | static inline size_t iov_tail(struct iovec *iov) |
26418649 SY |
670 | { |
671 | return (size_t)iov->iov_base + iov->iov_len; | |
672 | } | |
673 | ||
1a1fc0b8 | 674 | static void scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
675 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
676 | unsigned int data_nents, struct iovec **iov, | |
677 | int *iov_cnt, bool copy_data) | |
f97ec7db | 678 | { |
141685a3 | 679 | int i, dbi; |
26418649 | 680 | int block_remaining = 0; |
141685a3 XL |
681 | void *from, *to = NULL; |
682 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 683 | struct scatterlist *sg; |
b6df4b79 | 684 | struct page *page; |
f97ec7db IT |
685 | |
686 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 687 | int sg_remaining = sg->length; |
f97ec7db | 688 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
689 | while (sg_remaining > 0) { |
690 | if (block_remaining == 0) { | |
3c58f737 BS |
691 | if (to) { |
692 | flush_dcache_page(page); | |
b6df4b79 | 693 | kunmap_atomic(to); |
3c58f737 | 694 | } |
b6df4b79 | 695 | |
26418649 | 696 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
697 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
698 | page = tcmu_get_block_page(udev, dbi); | |
699 | to = kmap_atomic(page); | |
26418649 | 700 | } |
141685a3 | 701 | |
3e609135 XL |
702 | /* |
703 | * Covert to virtual offset of the ring data area. | |
704 | */ | |
141685a3 | 705 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 706 | block_remaining); |
141685a3 | 707 | |
3e609135 XL |
708 | /* |
709 | * The following code will gather and map the blocks | |
710 | * to the same iovec when the blocks are all next to | |
711 | * each other. | |
712 | */ | |
713 | copy_bytes = min_t(size_t, sg_remaining, | |
714 | block_remaining); | |
26418649 | 715 | if (*iov_cnt != 0 && |
daf78c30 | 716 | to_offset == iov_tail(*iov)) { |
3e609135 XL |
717 | /* |
718 | * Will append to the current iovec, because | |
719 | * the current block page is next to the | |
720 | * previous one. | |
721 | */ | |
26418649 SY |
722 | (*iov)->iov_len += copy_bytes; |
723 | } else { | |
3e609135 XL |
724 | /* |
725 | * Will allocate a new iovec because we are | |
726 | * first time here or the current block page | |
727 | * is not next to the previous one. | |
728 | */ | |
729 | new_iov(iov, iov_cnt); | |
141685a3 | 730 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
731 | (*iov)->iov_len = copy_bytes; |
732 | } | |
3e609135 | 733 | |
f97ec7db | 734 | if (copy_data) { |
c542942c XL |
735 | offset = DATA_BLOCK_SIZE - block_remaining; |
736 | memcpy(to + offset, | |
737 | from + sg->length - sg_remaining, | |
738 | copy_bytes); | |
f97ec7db | 739 | } |
3e609135 | 740 | |
26418649 SY |
741 | sg_remaining -= copy_bytes; |
742 | block_remaining -= copy_bytes; | |
f97ec7db | 743 | } |
e2e21bd8 | 744 | kunmap_atomic(from - sg->offset); |
f97ec7db | 745 | } |
3e609135 | 746 | |
3c58f737 BS |
747 | if (to) { |
748 | flush_dcache_page(page); | |
b6df4b79 | 749 | kunmap_atomic(to); |
3c58f737 | 750 | } |
0c28481f SY |
751 | } |
752 | ||
a5d68ba8 | 753 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
6c3796d1 | 754 | bool bidi, uint32_t read_len) |
f97ec7db | 755 | { |
a5d68ba8 | 756 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 757 | int i, dbi; |
26418649 | 758 | int block_remaining = 0; |
b6df4b79 | 759 | void *from = NULL, *to; |
141685a3 | 760 | size_t copy_bytes, offset; |
a5d68ba8 | 761 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 762 | struct page *page; |
a5d68ba8 | 763 | unsigned int data_nents; |
141685a3 | 764 | uint32_t count = 0; |
a5d68ba8 XL |
765 | |
766 | if (!bidi) { | |
767 | data_sg = se_cmd->t_data_sg; | |
768 | data_nents = se_cmd->t_data_nents; | |
769 | } else { | |
a5d68ba8 XL |
770 | |
771 | /* | |
772 | * For bidi case, the first count blocks are for Data-Out | |
773 | * buffer blocks, and before gathering the Data-In buffer | |
774 | * the Data-Out buffer blocks should be discarded. | |
775 | */ | |
776 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
777 | |
778 | data_sg = se_cmd->t_bidi_data_sg; | |
779 | data_nents = se_cmd->t_bidi_data_nents; | |
780 | } | |
f97ec7db | 781 | |
141685a3 XL |
782 | tcmu_cmd_set_dbi_cur(cmd, count); |
783 | ||
f97ec7db | 784 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 785 | int sg_remaining = sg->length; |
f97ec7db | 786 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
6c3796d1 | 787 | while (sg_remaining > 0 && read_len > 0) { |
26418649 | 788 | if (block_remaining == 0) { |
b6df4b79 XL |
789 | if (from) |
790 | kunmap_atomic(from); | |
791 | ||
26418649 | 792 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 793 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
794 | page = tcmu_get_block_page(udev, dbi); |
795 | from = kmap_atomic(page); | |
3c58f737 | 796 | flush_dcache_page(page); |
26418649 SY |
797 | } |
798 | copy_bytes = min_t(size_t, sg_remaining, | |
799 | block_remaining); | |
6c3796d1 | 800 | if (read_len < copy_bytes) |
801 | copy_bytes = read_len; | |
141685a3 | 802 | offset = DATA_BLOCK_SIZE - block_remaining; |
c542942c | 803 | memcpy(to + sg->length - sg_remaining, from + offset, |
26418649 | 804 | copy_bytes); |
f97ec7db | 805 | |
26418649 SY |
806 | sg_remaining -= copy_bytes; |
807 | block_remaining -= copy_bytes; | |
6c3796d1 | 808 | read_len -= copy_bytes; |
f97ec7db | 809 | } |
e2e21bd8 | 810 | kunmap_atomic(to - sg->offset); |
6c3796d1 | 811 | if (read_len == 0) |
812 | break; | |
f97ec7db | 813 | } |
b6df4b79 XL |
814 | if (from) |
815 | kunmap_atomic(from); | |
f97ec7db IT |
816 | } |
817 | ||
b6df4b79 | 818 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 819 | { |
3c0f26ff | 820 | return thresh - bitmap_weight(bitmap, thresh); |
26418649 SY |
821 | } |
822 | ||
7c9e7a6f | 823 | /* |
f97ec7db | 824 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 825 | * space available on the data area. |
7c9e7a6f AG |
826 | * |
827 | * Called with ring lock held. | |
828 | */ | |
b6df4b79 XL |
829 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
830 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
831 | { |
832 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
833 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
834 | / DATA_BLOCK_SIZE; | |
0241fd39 | 835 | size_t space, cmd_needed; |
7c9e7a6f AG |
836 | u32 cmd_head; |
837 | ||
838 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
839 | ||
840 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
841 | ||
f56574a2 AG |
842 | /* |
843 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
844 | * original cmd - cmds are internally contiguous. | |
845 | */ | |
846 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
847 | cmd_needed = cmd_size; | |
848 | else | |
849 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
850 | ||
7c9e7a6f AG |
851 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
852 | if (space < cmd_needed) { | |
853 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
854 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
855 | return false; | |
856 | } | |
857 | ||
bc2d214a BS |
858 | if (!data_needed) |
859 | return true; | |
860 | ||
b6df4b79 XL |
861 | /* try to check and get the data blocks as needed */ |
862 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
3c0f26ff | 863 | if ((space * DATA_BLOCK_SIZE) < data_needed) { |
80eb8761 MC |
864 | unsigned long blocks_left = |
865 | (udev->max_blocks - udev->dbi_thresh) + space; | |
b6df4b79 XL |
866 | |
867 | if (blocks_left < blocks_needed) { | |
868 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
869 | blocks_left * DATA_BLOCK_SIZE, | |
870 | data_needed); | |
871 | return false; | |
872 | } | |
873 | ||
f890f579 | 874 | udev->dbi_thresh += blocks_needed; |
80eb8761 MC |
875 | if (udev->dbi_thresh > udev->max_blocks) |
876 | udev->dbi_thresh = udev->max_blocks; | |
7c9e7a6f AG |
877 | } |
878 | ||
daf78c30 | 879 | return tcmu_get_empty_blocks(udev, cmd); |
7c9e7a6f AG |
880 | } |
881 | ||
fe25cc34 XL |
882 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
883 | { | |
884 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
885 | sizeof(struct tcmu_cmd_entry)); | |
886 | } | |
887 | ||
888 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
889 | size_t base_command_size) | |
890 | { | |
891 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
892 | size_t command_size; | |
893 | ||
894 | command_size = base_command_size + | |
895 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
896 | TCMU_OP_ALIGN_SIZE); | |
897 | ||
898 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
899 | ||
900 | return command_size; | |
901 | } | |
902 | ||
61fb2482 BS |
903 | static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, |
904 | struct timer_list *timer) | |
0d44374c | 905 | { |
9103575a | 906 | if (!tmo) |
61fb2482 | 907 | return; |
9103575a | 908 | |
0d44374c | 909 | tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); |
a94a2572 XL |
910 | if (!timer_pending(timer)) |
911 | mod_timer(timer, tcmu_cmd->deadline); | |
912 | ||
61fb2482 BS |
913 | pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, |
914 | tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); | |
0d44374c MC |
915 | } |
916 | ||
a94a2572 | 917 | static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) |
af1dd7ff MC |
918 | { |
919 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
9103575a | 920 | unsigned int tmo; |
af1dd7ff | 921 | |
9103575a MC |
922 | /* |
923 | * For backwards compat if qfull_time_out is not set use | |
924 | * cmd_time_out and if that's not set use the default time out. | |
925 | */ | |
926 | if (!udev->qfull_time_out) | |
927 | return -ETIMEDOUT; | |
928 | else if (udev->qfull_time_out > 0) | |
929 | tmo = udev->qfull_time_out; | |
930 | else if (udev->cmd_time_out) | |
931 | tmo = udev->cmd_time_out; | |
932 | else | |
933 | tmo = TCMU_TIME_OUT; | |
934 | ||
61fb2482 | 935 | tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); |
af1dd7ff | 936 | |
a94a2572 | 937 | list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); |
61fb2482 BS |
938 | pr_debug("adding cmd %p on dev %s to ring space wait queue\n", |
939 | tcmu_cmd, udev->name); | |
af1dd7ff MC |
940 | return 0; |
941 | } | |
942 | ||
3d3f9d56 BS |
943 | static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) |
944 | { | |
945 | struct tcmu_cmd_entry_hdr *hdr; | |
946 | struct tcmu_mailbox *mb = udev->mb_addr; | |
947 | uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
948 | ||
949 | /* Insert a PAD if end-of-ring space is too small */ | |
950 | if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { | |
951 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
952 | ||
953 | hdr = (void *) mb + CMDR_OFF + cmd_head; | |
954 | tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); | |
955 | tcmu_hdr_set_len(&hdr->len_op, pad_size); | |
956 | hdr->cmd_id = 0; /* not used for PAD */ | |
957 | hdr->kflags = 0; | |
958 | hdr->uflags = 0; | |
959 | tcmu_flush_dcache_range(hdr, sizeof(*hdr)); | |
960 | ||
961 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
962 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
963 | ||
964 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
965 | WARN_ON(cmd_head != 0); | |
966 | } | |
967 | ||
968 | return cmd_head; | |
969 | } | |
970 | ||
6fd0ce79 MC |
971 | /** |
972 | * queue_cmd_ring - queue cmd to ring or internally | |
973 | * @tcmu_cmd: cmd to queue | |
974 | * @scsi_err: TCM error code if failure (-1) returned. | |
975 | * | |
976 | * Returns: | |
977 | * -1 we cannot queue internally or to the ring. | |
978 | * 0 success | |
af1dd7ff | 979 | * 1 internally queued to wait for ring memory to free. |
6fd0ce79 | 980 | */ |
e7f41104 | 981 | static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) |
7c9e7a6f AG |
982 | { |
983 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
984 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
985 | size_t base_command_size, command_size; | |
3d3f9d56 | 986 | struct tcmu_mailbox *mb = udev->mb_addr; |
7c9e7a6f | 987 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 988 | struct iovec *iov; |
61fb2482 | 989 | int iov_cnt, cmd_id; |
7c9e7a6f AG |
990 | uint32_t cmd_head; |
991 | uint64_t cdb_off; | |
f97ec7db | 992 | bool copy_to_data_area; |
ab22d260 | 993 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f | 994 | |
6fd0ce79 MC |
995 | *scsi_err = TCM_NO_SENSE; |
996 | ||
892782ca MC |
997 | if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { |
998 | *scsi_err = TCM_LUN_BUSY; | |
999 | return -1; | |
1000 | } | |
1001 | ||
6fd0ce79 MC |
1002 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { |
1003 | *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1004 | return -1; | |
1005 | } | |
7c9e7a6f AG |
1006 | |
1007 | /* | |
1008 | * Must be a certain minimum size for response sense info, but | |
1009 | * also may be larger if the iov array is large. | |
1010 | * | |
fe25cc34 XL |
1011 | * We prepare as many iovs as possbile for potential uses here, |
1012 | * because it's expensive to tell how many regions are freed in | |
1013 | * the bitmap & global data pool, as the size calculated here | |
1014 | * will only be used to do the checks. | |
1015 | * | |
1016 | * The size will be recalculated later as actually needed to save | |
1017 | * cmd area memories. | |
1018 | */ | |
1019 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
1020 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 1021 | |
a94a2572 | 1022 | if (!list_empty(&udev->qfull_queue)) |
af1dd7ff | 1023 | goto queue; |
7c9e7a6f | 1024 | |
554617b2 AG |
1025 | if ((command_size > (udev->cmdr_size / 2)) || |
1026 | data_length > udev->data_size) { | |
1027 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 1028 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 1029 | udev->cmdr_size, udev->data_size); |
6fd0ce79 MC |
1030 | *scsi_err = TCM_INVALID_CDB_FIELD; |
1031 | return -1; | |
554617b2 | 1032 | } |
7c9e7a6f | 1033 | |
af1dd7ff | 1034 | if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
810b8153 MC |
1035 | /* |
1036 | * Don't leave commands partially setup because the unmap | |
1037 | * thread might need the blocks to make forward progress. | |
1038 | */ | |
1039 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); | |
1040 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); | |
af1dd7ff | 1041 | goto queue; |
7c9e7a6f AG |
1042 | } |
1043 | ||
3d3f9d56 | 1044 | cmd_head = ring_insert_padding(udev, command_size); |
7c9e7a6f AG |
1045 | |
1046 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
b3743c71 | 1047 | memset(entry, 0, command_size); |
0ad46af8 | 1048 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
7c9e7a6f | 1049 | |
3d9b9555 | 1050 | /* Handle allocating space from the data area */ |
b6df4b79 | 1051 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 1052 | iov = &entry->req.iov[0]; |
f97ec7db | 1053 | iov_cnt = 0; |
e4648b01 IT |
1054 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
1055 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
1a1fc0b8 MC |
1056 | scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
1057 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
1058 | copy_to_data_area); | |
7c9e7a6f AG |
1059 | entry->req.iov_cnt = iov_cnt; |
1060 | ||
e4648b01 | 1061 | /* Handle BIDI commands */ |
b3743c71 | 1062 | iov_cnt = 0; |
ab22d260 | 1063 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 1064 | iov++; |
1a1fc0b8 MC |
1065 | scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg, |
1066 | se_cmd->t_bidi_data_nents, &iov, &iov_cnt, | |
1067 | false); | |
ab22d260 | 1068 | } |
b3743c71 | 1069 | entry->req.iov_bidi_cnt = iov_cnt; |
26418649 | 1070 | |
61fb2482 BS |
1071 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); |
1072 | if (cmd_id < 0) { | |
1073 | pr_err("tcmu: Could not allocate cmd id.\n"); | |
6fd0ce79 | 1074 | |
61fb2482 | 1075 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
6fd0ce79 MC |
1076 | *scsi_err = TCM_OUT_OF_RESOURCES; |
1077 | return -1; | |
0d44374c | 1078 | } |
61fb2482 BS |
1079 | tcmu_cmd->cmd_id = cmd_id; |
1080 | ||
1081 | pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, | |
1082 | tcmu_cmd, udev->name); | |
1083 | ||
1084 | tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); | |
1085 | ||
0d44374c MC |
1086 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; |
1087 | ||
fe25cc34 XL |
1088 | /* |
1089 | * Recalaulate the command's base size and size according | |
1090 | * to the actual needs | |
1091 | */ | |
1092 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
1093 | entry->req.iov_bidi_cnt); | |
1094 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
1095 | ||
1096 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
1097 | ||
7c9e7a6f AG |
1098 | /* All offsets relative to mb_addr, not start of entry! */ |
1099 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
1100 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
1101 | entry->req.cdb_off = cdb_off; | |
8c4e0f21 | 1102 | tcmu_flush_dcache_range(entry, command_size); |
7c9e7a6f AG |
1103 | |
1104 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
1105 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
7c9e7a6f | 1106 | |
a94a2572 | 1107 | list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); |
a94a2572 | 1108 | |
7c9e7a6f AG |
1109 | /* TODO: only if FLUSH and FUA? */ |
1110 | uio_event_notify(&udev->uio_info); | |
1111 | ||
6fd0ce79 | 1112 | return 0; |
af1dd7ff MC |
1113 | |
1114 | queue: | |
a94a2572 | 1115 | if (add_to_qfull_queue(tcmu_cmd)) { |
af1dd7ff MC |
1116 | *scsi_err = TCM_OUT_OF_RESOURCES; |
1117 | return -1; | |
1118 | } | |
1119 | ||
1120 | return 1; | |
7c9e7a6f AG |
1121 | } |
1122 | ||
bc2d214a BS |
1123 | /** |
1124 | * queue_tmr_ring - queue tmr info to ring or internally | |
1125 | * @udev: related tcmu_dev | |
1126 | * @tmr: tcmu_tmr containing tmr info to queue | |
1127 | * | |
1128 | * Returns: | |
1129 | * 0 success | |
1130 | * 1 internally queued to wait for ring memory to free. | |
1131 | */ | |
1132 | static int | |
1133 | queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) | |
1134 | { | |
1135 | struct tcmu_tmr_entry *entry; | |
1136 | int cmd_size; | |
1137 | int id_list_sz; | |
1138 | struct tcmu_mailbox *mb = udev->mb_addr; | |
1139 | uint32_t cmd_head; | |
1140 | ||
1141 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
1142 | goto out_free; | |
1143 | ||
1144 | id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; | |
1145 | cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); | |
1146 | ||
1147 | if (!list_empty(&udev->tmr_queue) || | |
1148 | !is_ring_space_avail(udev, NULL, cmd_size, 0)) { | |
1149 | list_add_tail(&tmr->queue_entry, &udev->tmr_queue); | |
1150 | pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", | |
1151 | tmr, udev->name); | |
1152 | return 1; | |
1153 | } | |
1154 | ||
1155 | cmd_head = ring_insert_padding(udev, cmd_size); | |
1156 | ||
1157 | entry = (void *)mb + CMDR_OFF + cmd_head; | |
1158 | memset(entry, 0, cmd_size); | |
1159 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); | |
1160 | tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); | |
1161 | entry->tmr_type = tmr->tmr_type; | |
1162 | entry->cmd_cnt = tmr->tmr_cmd_cnt; | |
1163 | memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); | |
1164 | tcmu_flush_dcache_range(entry, cmd_size); | |
1165 | ||
1166 | UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); | |
1167 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1168 | ||
1169 | uio_event_notify(&udev->uio_info); | |
1170 | ||
1171 | out_free: | |
1172 | kfree(tmr); | |
1173 | ||
1174 | return 0; | |
1175 | } | |
1176 | ||
02eb924f AG |
1177 | static sense_reason_t |
1178 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f | 1179 | { |
af1dd7ff MC |
1180 | struct se_device *se_dev = se_cmd->se_dev; |
1181 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
7c9e7a6f | 1182 | struct tcmu_cmd *tcmu_cmd; |
c9684927 BS |
1183 | sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; |
1184 | int ret = -1; | |
7c9e7a6f AG |
1185 | |
1186 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
1187 | if (!tcmu_cmd) | |
02eb924f | 1188 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f | 1189 | |
af1dd7ff | 1190 | mutex_lock(&udev->cmdr_lock); |
a3512902 | 1191 | se_cmd->priv = tcmu_cmd; |
c9684927 BS |
1192 | if (!(se_cmd->transport_state & CMD_T_ABORTED)) |
1193 | ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); | |
af1dd7ff | 1194 | if (ret < 0) |
141685a3 | 1195 | tcmu_free_cmd(tcmu_cmd); |
a3512902 | 1196 | mutex_unlock(&udev->cmdr_lock); |
6fd0ce79 | 1197 | return scsi_ret; |
7c9e7a6f AG |
1198 | } |
1199 | ||
ed212ca8 BS |
1200 | static void tcmu_set_next_deadline(struct list_head *queue, |
1201 | struct timer_list *timer) | |
1202 | { | |
1203 | struct tcmu_cmd *cmd; | |
1204 | ||
1205 | if (!list_empty(queue)) { | |
1206 | cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); | |
1207 | mod_timer(timer, cmd->deadline); | |
1208 | } else | |
1209 | del_timer(timer); | |
1210 | } | |
1211 | ||
bc2d214a BS |
1212 | static int |
1213 | tcmu_tmr_type(enum tcm_tmreq_table tmf) | |
1214 | { | |
1215 | switch (tmf) { | |
1216 | case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; | |
1217 | case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; | |
1218 | case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; | |
1219 | case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; | |
1220 | case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; | |
1221 | case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; | |
1222 | case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; | |
1223 | case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; | |
1224 | default: return TCMU_TMR_UNKNOWN; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | static void | |
1229 | tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, | |
1230 | struct list_head *cmd_list) | |
1231 | { | |
1232 | int i = 0, cmd_cnt = 0; | |
1233 | bool unqueued = false; | |
1234 | uint16_t *cmd_ids = NULL; | |
1235 | struct tcmu_cmd *cmd; | |
1236 | struct se_cmd *se_cmd; | |
1237 | struct tcmu_tmr *tmr; | |
1238 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
1239 | ||
1240 | mutex_lock(&udev->cmdr_lock); | |
1241 | ||
1242 | /* First we check for aborted commands in qfull_queue */ | |
1243 | list_for_each_entry(se_cmd, cmd_list, state_list) { | |
1244 | i++; | |
1245 | if (!se_cmd->priv) | |
1246 | continue; | |
1247 | cmd = se_cmd->priv; | |
1248 | /* Commands on qfull queue have no id yet */ | |
1249 | if (cmd->cmd_id) { | |
1250 | cmd_cnt++; | |
1251 | continue; | |
1252 | } | |
1253 | pr_debug("Removing aborted command %p from queue on dev %s.\n", | |
1254 | cmd, udev->name); | |
1255 | ||
1256 | list_del_init(&cmd->queue_entry); | |
1257 | tcmu_free_cmd(cmd); | |
1258 | target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); | |
1259 | unqueued = true; | |
1260 | } | |
1261 | if (unqueued) | |
1262 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); | |
1263 | ||
59526d7a BS |
1264 | if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) |
1265 | goto unlock; | |
1266 | ||
bc2d214a BS |
1267 | pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", |
1268 | tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); | |
1269 | ||
1270 | tmr = kmalloc(sizeof(*tmr) + cmd_cnt * sizeof(*cmd_ids), GFP_KERNEL); | |
1271 | if (!tmr) | |
1272 | goto unlock; | |
1273 | ||
1274 | tmr->tmr_type = tcmu_tmr_type(tmf); | |
1275 | tmr->tmr_cmd_cnt = cmd_cnt; | |
1276 | ||
1277 | if (cmd_cnt != 0) { | |
1278 | cmd_cnt = 0; | |
1279 | list_for_each_entry(se_cmd, cmd_list, state_list) { | |
1280 | if (!se_cmd->priv) | |
1281 | continue; | |
1282 | cmd = se_cmd->priv; | |
1283 | if (cmd->cmd_id) | |
1284 | tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | queue_tmr_ring(udev, tmr); | |
1289 | ||
1290 | unlock: | |
1291 | mutex_unlock(&udev->cmdr_lock); | |
1292 | } | |
1293 | ||
7c9e7a6f AG |
1294 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) |
1295 | { | |
1296 | struct se_cmd *se_cmd = cmd->se_cmd; | |
1297 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
6c3796d1 | 1298 | bool read_len_valid = false; |
a86a7586 | 1299 | uint32_t read_len; |
7c9e7a6f | 1300 | |
141685a3 XL |
1301 | /* |
1302 | * cmd has been completed already from timeout, just reclaim | |
1303 | * data area space and free cmd | |
1304 | */ | |
a86a7586 DF |
1305 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
1306 | WARN_ON_ONCE(se_cmd); | |
141685a3 | 1307 | goto out; |
a86a7586 | 1308 | } |
b25c7863 | 1309 | |
a94a2572 XL |
1310 | list_del_init(&cmd->queue_entry); |
1311 | ||
141685a3 | 1312 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 1313 | |
0ad46af8 | 1314 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
1315 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
1316 | cmd->se_cmd); | |
ed97d0cd | 1317 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
6c3796d1 | 1318 | goto done; |
1319 | } | |
1320 | ||
a86a7586 | 1321 | read_len = se_cmd->data_length; |
6c3796d1 | 1322 | if (se_cmd->data_direction == DMA_FROM_DEVICE && |
1323 | (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { | |
1324 | read_len_valid = true; | |
1325 | if (entry->rsp.read_len < read_len) | |
1326 | read_len = entry->rsp.read_len; | |
1327 | } | |
1328 | ||
1329 | if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 1330 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
6c3796d1 | 1331 | if (!read_len_valid ) |
1332 | goto done; | |
1333 | else | |
1334 | se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; | |
1335 | } | |
1336 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
26418649 | 1337 | /* Get Data-In buffer before clean up */ |
6c3796d1 | 1338 | gather_data_area(udev, cmd, true, read_len); |
e4648b01 | 1339 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
6c3796d1 | 1340 | gather_data_area(udev, cmd, false, read_len); |
7c9e7a6f | 1341 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 1342 | /* TODO: */ |
2bc396a2 IT |
1343 | } else if (se_cmd->data_direction != DMA_NONE) { |
1344 | pr_warn("TCMU: data direction was %d!\n", | |
1345 | se_cmd->data_direction); | |
7c9e7a6f AG |
1346 | } |
1347 | ||
6c3796d1 | 1348 | done: |
1349 | if (read_len_valid) { | |
1350 | pr_debug("read_len = %d\n", read_len); | |
1351 | target_complete_cmd_with_length(cmd->se_cmd, | |
1352 | entry->rsp.scsi_status, read_len); | |
1353 | } else | |
1354 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 1355 | |
141685a3 | 1356 | out: |
b6df4b79 | 1357 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 1358 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
1359 | } |
1360 | ||
bc2d214a BS |
1361 | static int tcmu_run_tmr_queue(struct tcmu_dev *udev) |
1362 | { | |
1363 | struct tcmu_tmr *tmr, *tmp; | |
1364 | LIST_HEAD(tmrs); | |
1365 | ||
1366 | if (list_empty(&udev->tmr_queue)) | |
1367 | return 1; | |
1368 | ||
1369 | pr_debug("running %s's tmr queue\n", udev->name); | |
1370 | ||
1371 | list_splice_init(&udev->tmr_queue, &tmrs); | |
1372 | ||
1373 | list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { | |
1374 | list_del_init(&tmr->queue_entry); | |
1375 | ||
1376 | pr_debug("removing tmr %p on dev %s from queue\n", | |
1377 | tmr, udev->name); | |
1378 | ||
1379 | if (queue_tmr_ring(udev, tmr)) { | |
1380 | pr_debug("ran out of space during tmr queue run\n"); | |
1381 | /* | |
1382 | * tmr was requeued, so just put all tmrs back in | |
1383 | * the queue | |
1384 | */ | |
1385 | list_splice_tail(&tmrs, &udev->tmr_queue); | |
1386 | return 0; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | return 1; | |
1391 | } | |
1392 | ||
7c9e7a6f AG |
1393 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) |
1394 | { | |
1395 | struct tcmu_mailbox *mb; | |
a94a2572 | 1396 | struct tcmu_cmd *cmd; |
bc2d214a | 1397 | bool free_space = false; |
7c9e7a6f AG |
1398 | |
1399 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
1400 | pr_err("ring broken, not handling completions\n"); | |
1401 | return 0; | |
1402 | } | |
1403 | ||
7c9e7a6f AG |
1404 | mb = udev->mb_addr; |
1405 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1406 | ||
6aa7de05 | 1407 | while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
7c9e7a6f AG |
1408 | |
1409 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
7c9e7a6f | 1410 | |
5a0c256d BS |
1411 | /* |
1412 | * Flush max. up to end of cmd ring since current entry might | |
1413 | * be a padding that is shorter than sizeof(*entry) | |
1414 | */ | |
1415 | size_t ring_left = head_to_end(udev->cmdr_last_cleaned, | |
1416 | udev->cmdr_size); | |
1417 | tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? | |
1418 | ring_left : sizeof(*entry)); | |
7c9e7a6f | 1419 | |
bc2d214a BS |
1420 | free_space = true; |
1421 | ||
1422 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || | |
1423 | tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { | |
0ad46af8 AG |
1424 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1425 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1426 | udev->cmdr_size); | |
7c9e7a6f AG |
1427 | continue; |
1428 | } | |
0ad46af8 | 1429 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f | 1430 | |
d3e709e6 | 1431 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f | 1432 | if (!cmd) { |
88cf1073 MC |
1433 | pr_err("cmd_id %u not found, ring is broken\n", |
1434 | entry->hdr.cmd_id); | |
7c9e7a6f AG |
1435 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
1436 | break; | |
1437 | } | |
1438 | ||
1439 | tcmu_handle_completion(cmd, entry); | |
1440 | ||
0ad46af8 AG |
1441 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1442 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1443 | udev->cmdr_size); | |
7c9e7a6f | 1444 | } |
bc2d214a BS |
1445 | if (free_space) |
1446 | free_space = tcmu_run_tmr_queue(udev); | |
7c9e7a6f | 1447 | |
ed212ca8 BS |
1448 | if (atomic_read(&global_db_count) > tcmu_global_max_blocks && |
1449 | idr_is_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { | |
1450 | /* | |
1451 | * Allocated blocks exceeded global block limit, currently no | |
1452 | * more pending or waiting commands so try to reclaim blocks. | |
1453 | */ | |
1454 | schedule_delayed_work(&tcmu_unmap_work, 0); | |
af1dd7ff | 1455 | } |
ed212ca8 BS |
1456 | if (udev->cmd_time_out) |
1457 | tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); | |
7c9e7a6f | 1458 | |
bc2d214a | 1459 | return free_space; |
7c9e7a6f AG |
1460 | } |
1461 | ||
61fb2482 | 1462 | static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) |
7c9e7a6f | 1463 | { |
af1dd7ff | 1464 | struct se_cmd *se_cmd; |
7c9e7a6f | 1465 | |
ed212ca8 | 1466 | if (!time_after_eq(jiffies, cmd->deadline)) |
61fb2482 | 1467 | return; |
7c9e7a6f | 1468 | |
61fb2482 BS |
1469 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); |
1470 | list_del_init(&cmd->queue_entry); | |
45dc488c | 1471 | se_cmd = cmd->se_cmd; |
a3512902 | 1472 | se_cmd->priv = NULL; |
61fb2482 | 1473 | cmd->se_cmd = NULL; |
7c9e7a6f | 1474 | |
61fb2482 BS |
1475 | pr_debug("Timing out inflight cmd %u on dev %s.\n", |
1476 | cmd->cmd_id, cmd->tcmu_dev->name); | |
9103575a | 1477 | |
61fb2482 BS |
1478 | target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); |
1479 | } | |
9103575a | 1480 | |
61fb2482 BS |
1481 | static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) |
1482 | { | |
1483 | struct se_cmd *se_cmd; | |
9103575a | 1484 | |
ed212ca8 | 1485 | if (!time_after_eq(jiffies, cmd->deadline)) |
61fb2482 BS |
1486 | return; |
1487 | ||
9d7464b1 DC |
1488 | pr_debug("Timing out queued cmd %p on dev %s.\n", |
1489 | cmd, cmd->tcmu_dev->name); | |
1490 | ||
61fb2482 BS |
1491 | list_del_init(&cmd->queue_entry); |
1492 | se_cmd = cmd->se_cmd; | |
1493 | tcmu_free_cmd(cmd); | |
1494 | ||
61fb2482 | 1495 | target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); |
7c9e7a6f AG |
1496 | } |
1497 | ||
9103575a | 1498 | static void tcmu_device_timedout(struct tcmu_dev *udev) |
7c9e7a6f | 1499 | { |
488ebe4c MC |
1500 | spin_lock(&timed_out_udevs_lock); |
1501 | if (list_empty(&udev->timedout_entry)) | |
1502 | list_add_tail(&udev->timedout_entry, &timed_out_udevs); | |
1503 | spin_unlock(&timed_out_udevs_lock); | |
b6df4b79 | 1504 | |
af1dd7ff | 1505 | schedule_delayed_work(&tcmu_unmap_work, 0); |
7c9e7a6f AG |
1506 | } |
1507 | ||
9103575a MC |
1508 | static void tcmu_cmd_timedout(struct timer_list *t) |
1509 | { | |
1510 | struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); | |
1511 | ||
1512 | pr_debug("%s cmd timeout has expired\n", udev->name); | |
1513 | tcmu_device_timedout(udev); | |
1514 | } | |
1515 | ||
1516 | static void tcmu_qfull_timedout(struct timer_list *t) | |
1517 | { | |
1518 | struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); | |
1519 | ||
1520 | pr_debug("%s qfull timeout has expired\n", udev->name); | |
1521 | tcmu_device_timedout(udev); | |
1522 | } | |
1523 | ||
7c9e7a6f AG |
1524 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) |
1525 | { | |
1526 | struct tcmu_hba *tcmu_hba; | |
1527 | ||
1528 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1529 | if (!tcmu_hba) | |
1530 | return -ENOMEM; | |
1531 | ||
1532 | tcmu_hba->host_id = host_id; | |
1533 | hba->hba_ptr = tcmu_hba; | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | static void tcmu_detach_hba(struct se_hba *hba) | |
1539 | { | |
1540 | kfree(hba->hba_ptr); | |
1541 | hba->hba_ptr = NULL; | |
1542 | } | |
1543 | ||
1544 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1545 | { | |
1546 | struct tcmu_dev *udev; | |
1547 | ||
1548 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1549 | if (!udev) | |
1550 | return NULL; | |
f3cdbe39 | 1551 | kref_init(&udev->kref); |
7c9e7a6f AG |
1552 | |
1553 | udev->name = kstrdup(name, GFP_KERNEL); | |
1554 | if (!udev->name) { | |
1555 | kfree(udev); | |
1556 | return NULL; | |
1557 | } | |
1558 | ||
1559 | udev->hba = hba; | |
af980e46 | 1560 | udev->cmd_time_out = TCMU_TIME_OUT; |
9103575a | 1561 | udev->qfull_time_out = -1; |
7c9e7a6f | 1562 | |
80eb8761 | 1563 | udev->max_blocks = DATA_BLOCK_BITS_DEF; |
b6df4b79 | 1564 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f | 1565 | |
ff07e4a4 | 1566 | INIT_LIST_HEAD(&udev->node); |
488ebe4c | 1567 | INIT_LIST_HEAD(&udev->timedout_entry); |
a94a2572 | 1568 | INIT_LIST_HEAD(&udev->qfull_queue); |
bc2d214a | 1569 | INIT_LIST_HEAD(&udev->tmr_queue); |
a94a2572 | 1570 | INIT_LIST_HEAD(&udev->inflight_queue); |
7c9e7a6f | 1571 | idr_init(&udev->commands); |
7c9e7a6f | 1572 | |
9103575a MC |
1573 | timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); |
1574 | timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); | |
7c9e7a6f | 1575 | |
c22adc0b XL |
1576 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
1577 | ||
7c9e7a6f AG |
1578 | return &udev->se_dev; |
1579 | } | |
1580 | ||
61fb2482 | 1581 | static void run_qfull_queue(struct tcmu_dev *udev, bool fail) |
af1dd7ff MC |
1582 | { |
1583 | struct tcmu_cmd *tcmu_cmd, *tmp_cmd; | |
1584 | LIST_HEAD(cmds); | |
af1dd7ff MC |
1585 | sense_reason_t scsi_ret; |
1586 | int ret; | |
1587 | ||
a94a2572 | 1588 | if (list_empty(&udev->qfull_queue)) |
61fb2482 | 1589 | return; |
af1dd7ff | 1590 | |
892782ca | 1591 | pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); |
af1dd7ff | 1592 | |
a94a2572 | 1593 | list_splice_init(&udev->qfull_queue, &cmds); |
af1dd7ff | 1594 | |
a94a2572 XL |
1595 | list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { |
1596 | list_del_init(&tcmu_cmd->queue_entry); | |
af1dd7ff | 1597 | |
61fb2482 BS |
1598 | pr_debug("removing cmd %p on dev %s from queue\n", |
1599 | tcmu_cmd, udev->name); | |
af1dd7ff | 1600 | |
892782ca | 1601 | if (fail) { |
892782ca MC |
1602 | /* |
1603 | * We were not able to even start the command, so | |
1604 | * fail with busy to allow a retry in case runner | |
1605 | * was only temporarily down. If the device is being | |
1606 | * removed then LIO core will do the right thing and | |
1607 | * fail the retry. | |
1608 | */ | |
1609 | target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); | |
1610 | tcmu_free_cmd(tcmu_cmd); | |
1611 | continue; | |
1612 | } | |
1613 | ||
af1dd7ff MC |
1614 | ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); |
1615 | if (ret < 0) { | |
61fb2482 BS |
1616 | pr_debug("cmd %p on dev %s failed with %u\n", |
1617 | tcmu_cmd, udev->name, scsi_ret); | |
af1dd7ff MC |
1618 | /* |
1619 | * Ignore scsi_ret for now. target_complete_cmd | |
1620 | * drops it. | |
1621 | */ | |
1622 | target_complete_cmd(tcmu_cmd->se_cmd, | |
1623 | SAM_STAT_CHECK_CONDITION); | |
1624 | tcmu_free_cmd(tcmu_cmd); | |
1625 | } else if (ret > 0) { | |
1626 | pr_debug("ran out of space during cmdr queue run\n"); | |
1627 | /* | |
1628 | * cmd was requeued, so just put all cmds back in | |
1629 | * the queue | |
1630 | */ | |
a94a2572 | 1631 | list_splice_tail(&cmds, &udev->qfull_queue); |
a94a2572 | 1632 | break; |
af1dd7ff MC |
1633 | } |
1634 | } | |
a94a2572 XL |
1635 | |
1636 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); | |
af1dd7ff MC |
1637 | } |
1638 | ||
7c9e7a6f AG |
1639 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) |
1640 | { | |
af1dd7ff | 1641 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
7c9e7a6f | 1642 | |
af1dd7ff | 1643 | mutex_lock(&udev->cmdr_lock); |
bc2d214a BS |
1644 | if (tcmu_handle_completions(udev)) |
1645 | run_qfull_queue(udev, false); | |
af1dd7ff | 1646 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
1647 | |
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1653 | * and this stuff must come along. | |
1654 | */ | |
1655 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1656 | { | |
1657 | struct tcmu_dev *udev = vma->vm_private_data; | |
1658 | struct uio_info *info = &udev->uio_info; | |
1659 | ||
1660 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1661 | if (info->mem[vma->vm_pgoff].size == 0) | |
1662 | return -1; | |
1663 | return (int)vma->vm_pgoff; | |
1664 | } | |
1665 | return -1; | |
1666 | } | |
1667 | ||
b6df4b79 XL |
1668 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1669 | { | |
1670 | struct page *page; | |
b6df4b79 XL |
1671 | |
1672 | mutex_lock(&udev->cmdr_lock); | |
1673 | page = tcmu_get_block_page(udev, dbi); | |
1674 | if (likely(page)) { | |
1675 | mutex_unlock(&udev->cmdr_lock); | |
1676 | return page; | |
1677 | } | |
1678 | ||
1679 | /* | |
c1c390ba MC |
1680 | * Userspace messed up and passed in a address not in the |
1681 | * data iov passed to it. | |
b6df4b79 | 1682 | */ |
c1c390ba MC |
1683 | pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n", |
1684 | dbi, udev->name); | |
1685 | page = NULL; | |
b6df4b79 XL |
1686 | mutex_unlock(&udev->cmdr_lock); |
1687 | ||
1688 | return page; | |
1689 | } | |
1690 | ||
69589c9b | 1691 | static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1692 | { |
11bac800 | 1693 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1694 | struct uio_info *info = &udev->uio_info; |
1695 | struct page *page; | |
1696 | unsigned long offset; | |
1697 | void *addr; | |
1698 | ||
11bac800 | 1699 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1700 | if (mi < 0) |
1701 | return VM_FAULT_SIGBUS; | |
1702 | ||
1703 | /* | |
1704 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1705 | * to use mem[N]. | |
1706 | */ | |
1707 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1708 | ||
141685a3 XL |
1709 | if (offset < udev->data_off) { |
1710 | /* For the vmalloc()ed cmd area pages */ | |
1711 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1712 | page = vmalloc_to_page(addr); |
141685a3 | 1713 | } else { |
141685a3 XL |
1714 | uint32_t dbi; |
1715 | ||
b6df4b79 | 1716 | /* For the dynamically growing data area pages */ |
141685a3 | 1717 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1718 | page = tcmu_try_get_block_page(udev, dbi); |
1719 | if (!page) | |
c1c390ba | 1720 | return VM_FAULT_SIGBUS; |
141685a3 XL |
1721 | } |
1722 | ||
7c9e7a6f AG |
1723 | get_page(page); |
1724 | vmf->page = page; | |
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1729 | .fault = tcmu_vma_fault, | |
1730 | }; | |
1731 | ||
1732 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1733 | { | |
1734 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1735 | ||
1736 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1737 | vma->vm_ops = &tcmu_vm_ops; | |
1738 | ||
1739 | vma->vm_private_data = udev; | |
1740 | ||
1741 | /* Ensure the mmap is exactly the right size */ | |
80eb8761 | 1742 | if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT)) |
7c9e7a6f AG |
1743 | return -EINVAL; |
1744 | ||
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1749 | { | |
1750 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1751 | ||
1752 | /* O_EXCL not supported for char devs, so fake it? */ | |
1753 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1754 | return -EBUSY; | |
1755 | ||
b6df4b79 | 1756 | udev->inode = inode; |
9260695d | 1757 | kref_get(&udev->kref); |
b6df4b79 | 1758 | |
7c9e7a6f AG |
1759 | pr_debug("open\n"); |
1760 | ||
1761 | return 0; | |
1762 | } | |
1763 | ||
f3cdbe39 MC |
1764 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1765 | { | |
1766 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1767 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1768 | ||
1769 | kfree(udev->uio_info.name); | |
1770 | kfree(udev->name); | |
1771 | kfree(udev); | |
1772 | } | |
1773 | ||
c22adc0b XL |
1774 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
1775 | { | |
1776 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
1777 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
1778 | return 0; | |
1779 | } | |
1780 | return -EINVAL; | |
1781 | } | |
1782 | ||
bf99ec13 MC |
1783 | static void tcmu_blocks_release(struct radix_tree_root *blocks, |
1784 | int start, int end) | |
c22adc0b XL |
1785 | { |
1786 | int i; | |
1787 | struct page *page; | |
1788 | ||
bf99ec13 MC |
1789 | for (i = start; i < end; i++) { |
1790 | page = radix_tree_delete(blocks, i); | |
c22adc0b XL |
1791 | if (page) { |
1792 | __free_page(page); | |
1793 | atomic_dec(&global_db_count); | |
1794 | } | |
1795 | } | |
c22adc0b XL |
1796 | } |
1797 | ||
bc2d214a BS |
1798 | static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) |
1799 | { | |
1800 | struct tcmu_tmr *tmr, *tmp; | |
1801 | ||
1802 | list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { | |
1803 | list_del_init(&tmr->queue_entry); | |
1804 | kfree(tmr); | |
1805 | } | |
1806 | } | |
1807 | ||
f3cdbe39 MC |
1808 | static void tcmu_dev_kref_release(struct kref *kref) |
1809 | { | |
1810 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1811 | struct se_device *dev = &udev->se_dev; | |
c22adc0b XL |
1812 | struct tcmu_cmd *cmd; |
1813 | bool all_expired = true; | |
1814 | int i; | |
1815 | ||
1816 | vfree(udev->mb_addr); | |
1817 | udev->mb_addr = NULL; | |
1818 | ||
488ebe4c MC |
1819 | spin_lock_bh(&timed_out_udevs_lock); |
1820 | if (!list_empty(&udev->timedout_entry)) | |
1821 | list_del(&udev->timedout_entry); | |
1822 | spin_unlock_bh(&timed_out_udevs_lock); | |
1823 | ||
c22adc0b | 1824 | /* Upper layer should drain all requests before calling this */ |
6fddcb77 | 1825 | mutex_lock(&udev->cmdr_lock); |
c22adc0b XL |
1826 | idr_for_each_entry(&udev->commands, cmd, i) { |
1827 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1828 | all_expired = false; | |
1829 | } | |
bc2d214a BS |
1830 | /* There can be left over TMR cmds. Remove them. */ |
1831 | tcmu_remove_all_queued_tmr(udev); | |
61fb2482 BS |
1832 | if (!list_empty(&udev->qfull_queue)) |
1833 | all_expired = false; | |
c22adc0b | 1834 | idr_destroy(&udev->commands); |
c22adc0b XL |
1835 | WARN_ON(!all_expired); |
1836 | ||
bf99ec13 | 1837 | tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1); |
98effe47 | 1838 | bitmap_free(udev->data_bitmap); |
bf99ec13 | 1839 | mutex_unlock(&udev->cmdr_lock); |
f3cdbe39 MC |
1840 | |
1841 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1842 | } | |
1843 | ||
7c9e7a6f AG |
1844 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1845 | { | |
1846 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1847 | ||
1848 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1849 | ||
1850 | pr_debug("close\n"); | |
9260695d | 1851 | /* release ref from open */ |
f3cdbe39 | 1852 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1853 | return 0; |
1854 | } | |
1855 | ||
9de3a1ef | 1856 | static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
b3af66e2 MC |
1857 | { |
1858 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1859 | ||
1860 | if (!tcmu_kern_cmd_reply_supported) | |
9de3a1ef | 1861 | return 0; |
b849b456 KN |
1862 | |
1863 | if (udev->nl_reply_supported <= 0) | |
9de3a1ef | 1864 | return 0; |
b849b456 | 1865 | |
3228691f | 1866 | mutex_lock(&tcmu_nl_cmd_mutex); |
b849b456 | 1867 | |
bdaeedc1 MC |
1868 | if (tcmu_netlink_blocked) { |
1869 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
1870 | pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, | |
1871 | udev->name); | |
1872 | return -EAGAIN; | |
1873 | } | |
b3af66e2 MC |
1874 | |
1875 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
3228691f | 1876 | mutex_unlock(&tcmu_nl_cmd_mutex); |
9de3a1ef MC |
1877 | pr_warn("netlink cmd %d already executing on %s\n", |
1878 | nl_cmd->cmd, udev->name); | |
1879 | return -EBUSY; | |
b3af66e2 MC |
1880 | } |
1881 | ||
1882 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1883 | nl_cmd->cmd = cmd; | |
3228691f | 1884 | nl_cmd->udev = udev; |
b3af66e2 | 1885 | init_completion(&nl_cmd->complete); |
3228691f MC |
1886 | INIT_LIST_HEAD(&nl_cmd->nl_list); |
1887 | ||
1888 | list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); | |
b3af66e2 | 1889 | |
3228691f | 1890 | mutex_unlock(&tcmu_nl_cmd_mutex); |
9de3a1ef | 1891 | return 0; |
b3af66e2 MC |
1892 | } |
1893 | ||
7d894862 LZ |
1894 | static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) |
1895 | { | |
1896 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1897 | ||
1898 | if (!tcmu_kern_cmd_reply_supported) | |
1899 | return; | |
1900 | ||
1901 | if (udev->nl_reply_supported <= 0) | |
1902 | return; | |
1903 | ||
1904 | mutex_lock(&tcmu_nl_cmd_mutex); | |
1905 | ||
1906 | list_del(&nl_cmd->nl_list); | |
1907 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1908 | ||
1909 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
1910 | } | |
1911 | ||
b3af66e2 MC |
1912 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) |
1913 | { | |
1914 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1915 | int ret; | |
b3af66e2 MC |
1916 | |
1917 | if (!tcmu_kern_cmd_reply_supported) | |
1918 | return 0; | |
1919 | ||
b849b456 KN |
1920 | if (udev->nl_reply_supported <= 0) |
1921 | return 0; | |
1922 | ||
b3af66e2 MC |
1923 | pr_debug("sleeping for nl reply\n"); |
1924 | wait_for_completion(&nl_cmd->complete); | |
1925 | ||
3228691f | 1926 | mutex_lock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
1927 | nl_cmd->cmd = TCMU_CMD_UNSPEC; |
1928 | ret = nl_cmd->status; | |
3228691f | 1929 | mutex_unlock(&tcmu_nl_cmd_mutex); |
b3af66e2 | 1930 | |
85fae482 | 1931 | return ret; |
b3af66e2 MC |
1932 | } |
1933 | ||
0e5aee39 ZL |
1934 | static int tcmu_netlink_event_init(struct tcmu_dev *udev, |
1935 | enum tcmu_genl_cmd cmd, | |
1936 | struct sk_buff **buf, void **hdr) | |
7c9e7a6f AG |
1937 | { |
1938 | struct sk_buff *skb; | |
1939 | void *msg_header; | |
6e14eab9 | 1940 | int ret = -ENOMEM; |
7c9e7a6f AG |
1941 | |
1942 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1943 | if (!skb) | |
6e14eab9 | 1944 | return ret; |
7c9e7a6f AG |
1945 | |
1946 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1947 | if (!msg_header) |
1948 | goto free_skb; | |
7c9e7a6f | 1949 | |
b3af66e2 | 1950 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1951 | if (ret < 0) |
1952 | goto free_skb; | |
7c9e7a6f | 1953 | |
b3af66e2 MC |
1954 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1955 | if (ret < 0) | |
1956 | goto free_skb; | |
1957 | ||
1958 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1959 | if (ret < 0) |
1960 | goto free_skb; | |
7c9e7a6f | 1961 | |
0e5aee39 ZL |
1962 | *buf = skb; |
1963 | *hdr = msg_header; | |
1964 | return ret; | |
2d76443e | 1965 | |
0e5aee39 ZL |
1966 | free_skb: |
1967 | nlmsg_free(skb); | |
1968 | return ret; | |
1969 | } | |
1970 | ||
1971 | static int tcmu_netlink_event_send(struct tcmu_dev *udev, | |
1972 | enum tcmu_genl_cmd cmd, | |
06add777 | 1973 | struct sk_buff *skb, void *msg_header) |
0e5aee39 | 1974 | { |
06add777 | 1975 | int ret; |
8a45885c | 1976 | |
053c095a | 1977 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1978 | |
9de3a1ef MC |
1979 | ret = tcmu_init_genl_cmd_reply(udev, cmd); |
1980 | if (ret) { | |
1981 | nlmsg_free(skb); | |
1982 | return ret; | |
1983 | } | |
b3af66e2 | 1984 | |
20c08b36 | 1985 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
0e5aee39 | 1986 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
2ff717cd CA |
1987 | |
1988 | /* Wait during an add as the listener may not be up yet */ | |
1989 | if (ret == 0 || | |
1990 | (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) | |
1991 | return tcmu_wait_genl_cmd_reply(udev); | |
7d894862 LZ |
1992 | else |
1993 | tcmu_destroy_genl_cmd_reply(udev); | |
2ff717cd | 1994 | |
6e14eab9 | 1995 | return ret; |
7c9e7a6f AG |
1996 | } |
1997 | ||
e0c240ac ZL |
1998 | static int tcmu_send_dev_add_event(struct tcmu_dev *udev) |
1999 | { | |
2000 | struct sk_buff *skb = NULL; | |
2001 | void *msg_header = NULL; | |
2002 | int ret = 0; | |
2003 | ||
2004 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, | |
2005 | &msg_header); | |
2006 | if (ret < 0) | |
2007 | return ret; | |
06add777 MC |
2008 | return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, |
2009 | msg_header); | |
e0c240ac ZL |
2010 | } |
2011 | ||
f892bd8e ZL |
2012 | static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) |
2013 | { | |
2014 | struct sk_buff *skb = NULL; | |
2015 | void *msg_header = NULL; | |
2016 | int ret = 0; | |
2017 | ||
2018 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, | |
2019 | &skb, &msg_header); | |
2020 | if (ret < 0) | |
2021 | return ret; | |
2022 | return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, | |
06add777 | 2023 | skb, msg_header); |
f892bd8e ZL |
2024 | } |
2025 | ||
de8c5221 | 2026 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 2027 | { |
7c9e7a6f AG |
2028 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
2029 | struct uio_info *info; | |
7c9e7a6f AG |
2030 | char *str; |
2031 | ||
2032 | info = &udev->uio_info; | |
7c9e7a6f | 2033 | |
7c9e7a6f | 2034 | if (udev->dev_config[0]) |
22c2f35f CJ |
2035 | str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, |
2036 | udev->name, udev->dev_config); | |
2037 | else | |
2038 | str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, | |
2039 | udev->name); | |
2040 | if (!str) | |
2041 | return -ENOMEM; | |
7c9e7a6f | 2042 | |
ededd039 BL |
2043 | /* If the old string exists, free it */ |
2044 | kfree(info->name); | |
7c9e7a6f AG |
2045 | info->name = str; |
2046 | ||
de8c5221 BL |
2047 | return 0; |
2048 | } | |
2049 | ||
2050 | static int tcmu_configure_device(struct se_device *dev) | |
2051 | { | |
2052 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2053 | struct uio_info *info; | |
2054 | struct tcmu_mailbox *mb; | |
2055 | int ret = 0; | |
2056 | ||
2057 | ret = tcmu_update_uio_info(udev); | |
2058 | if (ret) | |
2059 | return ret; | |
2060 | ||
2061 | info = &udev->uio_info; | |
2062 | ||
c97840c8 | 2063 | mutex_lock(&udev->cmdr_lock); |
98effe47 | 2064 | udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); |
c97840c8 | 2065 | mutex_unlock(&udev->cmdr_lock); |
a24e7917 WY |
2066 | if (!udev->data_bitmap) { |
2067 | ret = -ENOMEM; | |
80eb8761 | 2068 | goto err_bitmap_alloc; |
a24e7917 | 2069 | } |
80eb8761 | 2070 | |
141685a3 | 2071 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
2072 | if (!udev->mb_addr) { |
2073 | ret = -ENOMEM; | |
2074 | goto err_vzalloc; | |
2075 | } | |
2076 | ||
2077 | /* mailbox fits in first part of CMDR space */ | |
2078 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
2079 | udev->data_off = CMDR_SIZE; | |
80eb8761 | 2080 | udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE; |
b6df4b79 | 2081 | udev->dbi_thresh = 0; /* Default in Idle state */ |
7c9e7a6f | 2082 | |
141685a3 | 2083 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 2084 | mb = udev->mb_addr; |
0ad46af8 | 2085 | mb->version = TCMU_MAILBOX_VERSION; |
bc2d214a BS |
2086 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | |
2087 | TCMU_MAILBOX_FLAG_CAP_READ_LEN | | |
2088 | TCMU_MAILBOX_FLAG_CAP_TMR; | |
7c9e7a6f AG |
2089 | mb->cmdr_off = CMDR_OFF; |
2090 | mb->cmdr_size = udev->cmdr_size; | |
2091 | ||
2092 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
2093 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 2094 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 2095 | |
ac64a2ce | 2096 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
2097 | |
2098 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 2099 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
80eb8761 | 2100 | info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE; |
141685a3 | 2101 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
2102 | |
2103 | info->irqcontrol = tcmu_irqcontrol; | |
2104 | info->irq = UIO_IRQ_CUSTOM; | |
2105 | ||
2106 | info->mmap = tcmu_mmap; | |
2107 | info->open = tcmu_open; | |
2108 | info->release = tcmu_release; | |
2109 | ||
2110 | ret = uio_register_device(tcmu_root_device, info); | |
2111 | if (ret) | |
2112 | goto err_register; | |
2113 | ||
81ee28de SY |
2114 | /* User can set hw_block_size before enable the device */ |
2115 | if (dev->dev_attrib.hw_block_size == 0) | |
2116 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 2117 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
2118 | if (!dev->dev_attrib.hw_max_sectors) |
2119 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
2120 | if (!dev->dev_attrib.emulate_write_cache) |
2121 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
2122 | dev->dev_attrib.hw_queue_depth = 128; |
2123 | ||
b849b456 KN |
2124 | /* If user didn't explicitly disable netlink reply support, use |
2125 | * module scope setting. | |
2126 | */ | |
2127 | if (udev->nl_reply_supported >= 0) | |
2128 | udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; | |
2129 | ||
f3cdbe39 MC |
2130 | /* |
2131 | * Get a ref incase userspace does a close on the uio device before | |
2132 | * LIO has initiated tcmu_free_device. | |
2133 | */ | |
2134 | kref_get(&udev->kref); | |
2135 | ||
e0c240ac | 2136 | ret = tcmu_send_dev_add_event(udev); |
7c9e7a6f AG |
2137 | if (ret) |
2138 | goto err_netlink; | |
2139 | ||
b6df4b79 XL |
2140 | mutex_lock(&root_udev_mutex); |
2141 | list_add(&udev->node, &root_udev); | |
2142 | mutex_unlock(&root_udev_mutex); | |
2143 | ||
7c9e7a6f AG |
2144 | return 0; |
2145 | ||
2146 | err_netlink: | |
f3cdbe39 | 2147 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
2148 | uio_unregister_device(&udev->uio_info); |
2149 | err_register: | |
2150 | vfree(udev->mb_addr); | |
c22adc0b | 2151 | udev->mb_addr = NULL; |
7c9e7a6f | 2152 | err_vzalloc: |
98effe47 | 2153 | bitmap_free(udev->data_bitmap); |
80eb8761 MC |
2154 | udev->data_bitmap = NULL; |
2155 | err_bitmap_alloc: | |
7c9e7a6f | 2156 | kfree(info->name); |
f3cdbe39 | 2157 | info->name = NULL; |
7c9e7a6f AG |
2158 | |
2159 | return ret; | |
2160 | } | |
2161 | ||
7c9e7a6f | 2162 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
2163 | { |
2164 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2165 | ||
2166 | /* release ref from init */ | |
2167 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
2168 | } | |
2169 | ||
2170 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
2171 | { |
2172 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
7c9e7a6f | 2173 | |
9103575a MC |
2174 | del_timer_sync(&udev->cmd_timer); |
2175 | del_timer_sync(&udev->qfull_timer); | |
7c9e7a6f | 2176 | |
b6df4b79 XL |
2177 | mutex_lock(&root_udev_mutex); |
2178 | list_del(&udev->node); | |
2179 | mutex_unlock(&root_udev_mutex); | |
2180 | ||
f892bd8e | 2181 | tcmu_send_dev_remove_event(udev); |
7c9e7a6f | 2182 | |
531283ff | 2183 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
2184 | |
2185 | /* release ref from configure */ | |
2186 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
2187 | } |
2188 | ||
892782ca MC |
2189 | static void tcmu_unblock_dev(struct tcmu_dev *udev) |
2190 | { | |
2191 | mutex_lock(&udev->cmdr_lock); | |
2192 | clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); | |
2193 | mutex_unlock(&udev->cmdr_lock); | |
2194 | } | |
2195 | ||
2196 | static void tcmu_block_dev(struct tcmu_dev *udev) | |
2197 | { | |
2198 | mutex_lock(&udev->cmdr_lock); | |
2199 | ||
2200 | if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) | |
2201 | goto unlock; | |
2202 | ||
2203 | /* complete IO that has executed successfully */ | |
2204 | tcmu_handle_completions(udev); | |
2205 | /* fail IO waiting to be queued */ | |
a94a2572 | 2206 | run_qfull_queue(udev, true); |
892782ca MC |
2207 | |
2208 | unlock: | |
2209 | mutex_unlock(&udev->cmdr_lock); | |
2210 | } | |
2211 | ||
2212 | static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) | |
2213 | { | |
2214 | struct tcmu_mailbox *mb; | |
2215 | struct tcmu_cmd *cmd; | |
2216 | int i; | |
2217 | ||
2218 | mutex_lock(&udev->cmdr_lock); | |
2219 | ||
2220 | idr_for_each_entry(&udev->commands, cmd, i) { | |
892782ca MC |
2221 | pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n", |
2222 | cmd->cmd_id, udev->name, | |
2223 | test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)); | |
2224 | ||
2225 | idr_remove(&udev->commands, i); | |
2226 | if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
a86a7586 | 2227 | WARN_ON(!cmd->se_cmd); |
a94a2572 | 2228 | list_del_init(&cmd->queue_entry); |
892782ca MC |
2229 | if (err_level == 1) { |
2230 | /* | |
2231 | * Userspace was not able to start the | |
2232 | * command or it is retryable. | |
2233 | */ | |
2234 | target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); | |
2235 | } else { | |
2236 | /* hard failure */ | |
2237 | target_complete_cmd(cmd->se_cmd, | |
2238 | SAM_STAT_CHECK_CONDITION); | |
2239 | } | |
2240 | } | |
2241 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); | |
2242 | tcmu_free_cmd(cmd); | |
2243 | } | |
2244 | ||
2245 | mb = udev->mb_addr; | |
2246 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
2247 | pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, | |
2248 | mb->cmd_tail, mb->cmd_head); | |
2249 | ||
2250 | udev->cmdr_last_cleaned = 0; | |
2251 | mb->cmd_tail = 0; | |
2252 | mb->cmd_head = 0; | |
2253 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
066f79a5 | 2254 | clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
892782ca MC |
2255 | |
2256 | del_timer(&udev->cmd_timer); | |
2257 | ||
bc2d214a BS |
2258 | /* |
2259 | * ring is empty and qfull queue never contains aborted commands. | |
2260 | * So TMRs in tmr queue do not contain relevant cmd_ids. | |
2261 | * After a ring reset userspace should do a fresh start, so | |
2262 | * even LUN RESET message is no longer relevant. | |
2263 | * Therefore remove all TMRs from qfull queue | |
2264 | */ | |
2265 | tcmu_remove_all_queued_tmr(udev); | |
2266 | ||
61fb2482 BS |
2267 | run_qfull_queue(udev, false); |
2268 | ||
892782ca MC |
2269 | mutex_unlock(&udev->cmdr_lock); |
2270 | } | |
2271 | ||
7c9e7a6f | 2272 | enum { |
3abaa2bf | 2273 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
80eb8761 | 2274 | Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err, |
7c9e7a6f AG |
2275 | }; |
2276 | ||
2277 | static match_table_t tokens = { | |
2278 | {Opt_dev_config, "dev_config=%s"}, | |
0e0d7526 | 2279 | {Opt_dev_size, "dev_size=%s"}, |
b60cb1f8 MC |
2280 | {Opt_hw_block_size, "hw_block_size=%d"}, |
2281 | {Opt_hw_max_sectors, "hw_max_sectors=%d"}, | |
b849b456 | 2282 | {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
c97840c8 | 2283 | {Opt_max_data_area_mb, "max_data_area_mb=%d"}, |
7c9e7a6f AG |
2284 | {Opt_err, NULL} |
2285 | }; | |
2286 | ||
3abaa2bf MC |
2287 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
2288 | { | |
b60cb1f8 | 2289 | int val, ret; |
3abaa2bf | 2290 | |
b60cb1f8 | 2291 | ret = match_int(arg, &val); |
3abaa2bf | 2292 | if (ret < 0) { |
b60cb1f8 MC |
2293 | pr_err("match_int() failed for dev attrib. Error %d.\n", |
2294 | ret); | |
3abaa2bf MC |
2295 | return ret; |
2296 | } | |
b60cb1f8 MC |
2297 | |
2298 | if (val <= 0) { | |
2299 | pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", | |
2300 | val); | |
3abaa2bf MC |
2301 | return -EINVAL; |
2302 | } | |
b60cb1f8 | 2303 | *dev_attrib = val; |
3abaa2bf MC |
2304 | return 0; |
2305 | } | |
2306 | ||
c97840c8 MC |
2307 | static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) |
2308 | { | |
2309 | int val, ret; | |
2310 | ||
2311 | ret = match_int(arg, &val); | |
2312 | if (ret < 0) { | |
2313 | pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", | |
2314 | ret); | |
2315 | return ret; | |
2316 | } | |
2317 | ||
2318 | if (val <= 0) { | |
2319 | pr_err("Invalid max_data_area %d.\n", val); | |
2320 | return -EINVAL; | |
2321 | } | |
2322 | ||
2323 | mutex_lock(&udev->cmdr_lock); | |
2324 | if (udev->data_bitmap) { | |
2325 | pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); | |
2326 | ret = -EINVAL; | |
2327 | goto unlock; | |
2328 | } | |
2329 | ||
2330 | udev->max_blocks = TCMU_MBS_TO_BLOCKS(val); | |
2331 | if (udev->max_blocks > tcmu_global_max_blocks) { | |
2332 | pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", | |
2333 | val, TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks)); | |
2334 | udev->max_blocks = tcmu_global_max_blocks; | |
2335 | } | |
2336 | ||
2337 | unlock: | |
2338 | mutex_unlock(&udev->cmdr_lock); | |
2339 | return ret; | |
2340 | } | |
2341 | ||
7c9e7a6f AG |
2342 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
2343 | const char *page, ssize_t count) | |
2344 | { | |
2345 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
0e0d7526 | 2346 | char *orig, *ptr, *opts; |
7c9e7a6f | 2347 | substring_t args[MAX_OPT_ARGS]; |
c97840c8 | 2348 | int ret = 0, token; |
7c9e7a6f AG |
2349 | |
2350 | opts = kstrdup(page, GFP_KERNEL); | |
2351 | if (!opts) | |
2352 | return -ENOMEM; | |
2353 | ||
2354 | orig = opts; | |
2355 | ||
2356 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
2357 | if (!*ptr) | |
2358 | continue; | |
2359 | ||
2360 | token = match_token(ptr, tokens, args); | |
2361 | switch (token) { | |
2362 | case Opt_dev_config: | |
2363 | if (match_strlcpy(udev->dev_config, &args[0], | |
2364 | TCMU_CONFIG_LEN) == 0) { | |
2365 | ret = -EINVAL; | |
2366 | break; | |
2367 | } | |
2368 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
2369 | break; | |
2370 | case Opt_dev_size: | |
0e0d7526 | 2371 | ret = match_u64(&args[0], &udev->dev_size); |
7c9e7a6f | 2372 | if (ret < 0) |
0e0d7526 MC |
2373 | pr_err("match_u64() failed for dev_size=. Error %d.\n", |
2374 | ret); | |
7c9e7a6f | 2375 | break; |
9c1cd1b6 | 2376 | case Opt_hw_block_size: |
3abaa2bf MC |
2377 | ret = tcmu_set_dev_attrib(&args[0], |
2378 | &(dev->dev_attrib.hw_block_size)); | |
2379 | break; | |
2380 | case Opt_hw_max_sectors: | |
2381 | ret = tcmu_set_dev_attrib(&args[0], | |
2382 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 2383 | break; |
b849b456 | 2384 | case Opt_nl_reply_supported: |
b60cb1f8 | 2385 | ret = match_int(&args[0], &udev->nl_reply_supported); |
b849b456 | 2386 | if (ret < 0) |
b60cb1f8 MC |
2387 | pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", |
2388 | ret); | |
b849b456 | 2389 | break; |
80eb8761 | 2390 | case Opt_max_data_area_mb: |
c97840c8 | 2391 | ret = tcmu_set_max_blocks_param(udev, &args[0]); |
80eb8761 | 2392 | break; |
7c9e7a6f AG |
2393 | default: |
2394 | break; | |
2395 | } | |
2579325c MC |
2396 | |
2397 | if (ret) | |
2398 | break; | |
7c9e7a6f AG |
2399 | } |
2400 | ||
2401 | kfree(orig); | |
2402 | return (!ret) ? count : ret; | |
2403 | } | |
2404 | ||
2405 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
2406 | { | |
2407 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2408 | ssize_t bl = 0; | |
2409 | ||
2410 | bl = sprintf(b + bl, "Config: %s ", | |
2411 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
0e0d7526 | 2412 | bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); |
80eb8761 MC |
2413 | bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", |
2414 | TCMU_BLOCKS_TO_MBS(udev->max_blocks)); | |
7c9e7a6f AG |
2415 | |
2416 | return bl; | |
2417 | } | |
2418 | ||
2419 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
2420 | { | |
2421 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2422 | ||
2423 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
2424 | dev->dev_attrib.block_size); | |
2425 | } | |
2426 | ||
7c9e7a6f | 2427 | static sense_reason_t |
9c1cd1b6 | 2428 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 2429 | { |
02eb924f | 2430 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
2431 | } |
2432 | ||
7d7a7435 NB |
2433 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
2434 | { | |
2435 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2436 | struct se_dev_attrib, da_group); | |
b5ab697c | 2437 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
7d7a7435 NB |
2438 | |
2439 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
2440 | } | |
2441 | ||
2442 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
2443 | size_t count) | |
2444 | { | |
2445 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2446 | struct se_dev_attrib, da_group); | |
2447 | struct tcmu_dev *udev = container_of(da->da_dev, | |
2448 | struct tcmu_dev, se_dev); | |
2449 | u32 val; | |
2450 | int ret; | |
2451 | ||
2452 | if (da->da_dev->export_count) { | |
2453 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
2454 | return -EINVAL; | |
2455 | } | |
2456 | ||
2457 | ret = kstrtou32(page, 0, &val); | |
2458 | if (ret < 0) | |
2459 | return ret; | |
2460 | ||
7d7a7435 NB |
2461 | udev->cmd_time_out = val * MSEC_PER_SEC; |
2462 | return count; | |
2463 | } | |
2464 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
2465 | ||
9103575a MC |
2466 | static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) |
2467 | { | |
2468 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2469 | struct se_dev_attrib, da_group); | |
2470 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2471 | ||
2472 | return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? | |
2473 | udev->qfull_time_out : | |
2474 | udev->qfull_time_out / MSEC_PER_SEC); | |
2475 | } | |
2476 | ||
2477 | static ssize_t tcmu_qfull_time_out_store(struct config_item *item, | |
2478 | const char *page, size_t count) | |
2479 | { | |
2480 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2481 | struct se_dev_attrib, da_group); | |
2482 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2483 | s32 val; | |
2484 | int ret; | |
2485 | ||
2486 | ret = kstrtos32(page, 0, &val); | |
2487 | if (ret < 0) | |
2488 | return ret; | |
2489 | ||
2490 | if (val >= 0) { | |
2491 | udev->qfull_time_out = val * MSEC_PER_SEC; | |
125966db PKK |
2492 | } else if (val == -1) { |
2493 | udev->qfull_time_out = val; | |
9103575a MC |
2494 | } else { |
2495 | printk(KERN_ERR "Invalid qfull timeout value %d\n", val); | |
2496 | return -EINVAL; | |
2497 | } | |
2498 | return count; | |
2499 | } | |
2500 | CONFIGFS_ATTR(tcmu_, qfull_time_out); | |
2501 | ||
80eb8761 MC |
2502 | static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) |
2503 | { | |
2504 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2505 | struct se_dev_attrib, da_group); | |
2506 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2507 | ||
2508 | return snprintf(page, PAGE_SIZE, "%u\n", | |
2509 | TCMU_BLOCKS_TO_MBS(udev->max_blocks)); | |
2510 | } | |
2511 | CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); | |
2512 | ||
2d76443e | 2513 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
2514 | { |
2515 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2516 | struct se_dev_attrib, da_group); | |
2517 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2518 | ||
2519 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
2520 | } | |
2521 | ||
02ccfb54 ZL |
2522 | static int tcmu_send_dev_config_event(struct tcmu_dev *udev, |
2523 | const char *reconfig_data) | |
2524 | { | |
2525 | struct sk_buff *skb = NULL; | |
2526 | void *msg_header = NULL; | |
2527 | int ret = 0; | |
2528 | ||
2529 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2530 | &skb, &msg_header); | |
2531 | if (ret < 0) | |
2532 | return ret; | |
2533 | ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); | |
2534 | if (ret < 0) { | |
2535 | nlmsg_free(skb); | |
2536 | return ret; | |
2537 | } | |
2538 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2539 | skb, msg_header); |
02ccfb54 ZL |
2540 | } |
2541 | ||
2542 | ||
2d76443e MC |
2543 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
2544 | size_t count) | |
ee018252 BL |
2545 | { |
2546 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2547 | struct se_dev_attrib, da_group); | |
2548 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 2549 | int ret, len; |
ee018252 | 2550 | |
2d76443e MC |
2551 | len = strlen(page); |
2552 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 2553 | return -EINVAL; |
ee018252 BL |
2554 | |
2555 | /* Check if device has been configured before */ | |
63d5be0f | 2556 | if (target_dev_configured(&udev->se_dev)) { |
02ccfb54 | 2557 | ret = tcmu_send_dev_config_event(udev, page); |
ee018252 BL |
2558 | if (ret) { |
2559 | pr_err("Unable to reconfigure device\n"); | |
2560 | return ret; | |
2561 | } | |
de8c5221 BL |
2562 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
2563 | ||
2564 | ret = tcmu_update_uio_info(udev); | |
2565 | if (ret) | |
2566 | return ret; | |
2567 | return count; | |
ee018252 | 2568 | } |
2d76443e | 2569 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
2570 | |
2571 | return count; | |
2572 | } | |
2d76443e | 2573 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 2574 | |
801fc54d BL |
2575 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
2576 | { | |
2577 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2578 | struct se_dev_attrib, da_group); | |
2579 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2580 | ||
0e0d7526 | 2581 | return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); |
801fc54d BL |
2582 | } |
2583 | ||
84e28506 ZL |
2584 | static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) |
2585 | { | |
2586 | struct sk_buff *skb = NULL; | |
2587 | void *msg_header = NULL; | |
2588 | int ret = 0; | |
2589 | ||
2590 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2591 | &skb, &msg_header); | |
2592 | if (ret < 0) | |
2593 | return ret; | |
2594 | ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, | |
2595 | size, TCMU_ATTR_PAD); | |
2596 | if (ret < 0) { | |
2597 | nlmsg_free(skb); | |
2598 | return ret; | |
2599 | } | |
2600 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2601 | skb, msg_header); |
84e28506 ZL |
2602 | } |
2603 | ||
801fc54d BL |
2604 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, |
2605 | size_t count) | |
2606 | { | |
2607 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2608 | struct se_dev_attrib, da_group); | |
2609 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 2610 | u64 val; |
801fc54d BL |
2611 | int ret; |
2612 | ||
2d76443e | 2613 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
2614 | if (ret < 0) |
2615 | return ret; | |
801fc54d BL |
2616 | |
2617 | /* Check if device has been configured before */ | |
63d5be0f | 2618 | if (target_dev_configured(&udev->se_dev)) { |
84e28506 | 2619 | ret = tcmu_send_dev_size_event(udev, val); |
801fc54d BL |
2620 | if (ret) { |
2621 | pr_err("Unable to reconfigure device\n"); | |
2622 | return ret; | |
2623 | } | |
2624 | } | |
2d76443e | 2625 | udev->dev_size = val; |
801fc54d BL |
2626 | return count; |
2627 | } | |
2628 | CONFIGFS_ATTR(tcmu_, dev_size); | |
2629 | ||
b849b456 KN |
2630 | static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
2631 | char *page) | |
2632 | { | |
2633 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2634 | struct se_dev_attrib, da_group); | |
2635 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2636 | ||
2637 | return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); | |
2638 | } | |
2639 | ||
2640 | static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, | |
2641 | const char *page, size_t count) | |
2642 | { | |
2643 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2644 | struct se_dev_attrib, da_group); | |
2645 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2646 | s8 val; | |
2647 | int ret; | |
2648 | ||
2649 | ret = kstrtos8(page, 0, &val); | |
2650 | if (ret < 0) | |
2651 | return ret; | |
2652 | ||
2653 | udev->nl_reply_supported = val; | |
2654 | return count; | |
2655 | } | |
2656 | CONFIGFS_ATTR(tcmu_, nl_reply_supported); | |
2657 | ||
9a8bb606 BL |
2658 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
2659 | char *page) | |
2660 | { | |
2661 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2662 | struct se_dev_attrib, da_group); | |
2663 | ||
2664 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
2665 | } | |
2666 | ||
33d065cc ZL |
2667 | static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) |
2668 | { | |
2669 | struct sk_buff *skb = NULL; | |
2670 | void *msg_header = NULL; | |
2671 | int ret = 0; | |
2672 | ||
2673 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2674 | &skb, &msg_header); | |
2675 | if (ret < 0) | |
2676 | return ret; | |
2677 | ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); | |
2678 | if (ret < 0) { | |
2679 | nlmsg_free(skb); | |
2680 | return ret; | |
2681 | } | |
2682 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2683 | skb, msg_header); |
33d065cc ZL |
2684 | } |
2685 | ||
9a8bb606 BL |
2686 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, |
2687 | const char *page, size_t count) | |
2688 | { | |
2689 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2690 | struct se_dev_attrib, da_group); | |
1068be7b | 2691 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 2692 | u8 val; |
9a8bb606 BL |
2693 | int ret; |
2694 | ||
2d76443e | 2695 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
2696 | if (ret < 0) |
2697 | return ret; | |
2698 | ||
1068be7b | 2699 | /* Check if device has been configured before */ |
63d5be0f | 2700 | if (target_dev_configured(&udev->se_dev)) { |
33d065cc | 2701 | ret = tcmu_send_emulate_write_cache(udev, val); |
1068be7b BL |
2702 | if (ret) { |
2703 | pr_err("Unable to reconfigure device\n"); | |
2704 | return ret; | |
2705 | } | |
2706 | } | |
2d76443e MC |
2707 | |
2708 | da->emulate_write_cache = val; | |
9a8bb606 BL |
2709 | return count; |
2710 | } | |
2711 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
2712 | ||
59526d7a BS |
2713 | static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) |
2714 | { | |
2715 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2716 | struct se_dev_attrib, da_group); | |
2717 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2718 | ||
2719 | return snprintf(page, PAGE_SIZE, "%i\n", | |
2720 | test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); | |
2721 | } | |
2722 | ||
2723 | static ssize_t tcmu_tmr_notification_store(struct config_item *item, | |
2724 | const char *page, size_t count) | |
2725 | { | |
2726 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2727 | struct se_dev_attrib, da_group); | |
2728 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2729 | u8 val; | |
2730 | int ret; | |
2731 | ||
2732 | ret = kstrtou8(page, 0, &val); | |
2733 | if (ret < 0) | |
2734 | return ret; | |
2735 | if (val > 1) | |
2736 | return -EINVAL; | |
2737 | ||
2738 | if (val) | |
2739 | set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); | |
2740 | else | |
2741 | clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); | |
2742 | return count; | |
2743 | } | |
2744 | CONFIGFS_ATTR(tcmu_, tmr_notification); | |
2745 | ||
892782ca MC |
2746 | static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) |
2747 | { | |
2748 | struct se_device *se_dev = container_of(to_config_group(item), | |
2749 | struct se_device, | |
2750 | dev_action_group); | |
2751 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
2752 | ||
2753 | if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) | |
2754 | return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); | |
2755 | else | |
2756 | return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); | |
2757 | } | |
2758 | ||
2759 | static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, | |
2760 | size_t count) | |
2761 | { | |
2762 | struct se_device *se_dev = container_of(to_config_group(item), | |
2763 | struct se_device, | |
2764 | dev_action_group); | |
2765 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
2766 | u8 val; | |
2767 | int ret; | |
2768 | ||
a30b0473 MC |
2769 | if (!target_dev_configured(&udev->se_dev)) { |
2770 | pr_err("Device is not configured.\n"); | |
2771 | return -EINVAL; | |
2772 | } | |
2773 | ||
892782ca MC |
2774 | ret = kstrtou8(page, 0, &val); |
2775 | if (ret < 0) | |
2776 | return ret; | |
2777 | ||
2778 | if (val > 1) { | |
2779 | pr_err("Invalid block value %d\n", val); | |
2780 | return -EINVAL; | |
2781 | } | |
2782 | ||
2783 | if (!val) | |
2784 | tcmu_unblock_dev(udev); | |
2785 | else | |
2786 | tcmu_block_dev(udev); | |
2787 | return count; | |
2788 | } | |
2789 | CONFIGFS_ATTR(tcmu_, block_dev); | |
2790 | ||
2791 | static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, | |
2792 | size_t count) | |
2793 | { | |
2794 | struct se_device *se_dev = container_of(to_config_group(item), | |
2795 | struct se_device, | |
2796 | dev_action_group); | |
2797 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
2798 | u8 val; | |
2799 | int ret; | |
2800 | ||
a30b0473 MC |
2801 | if (!target_dev_configured(&udev->se_dev)) { |
2802 | pr_err("Device is not configured.\n"); | |
2803 | return -EINVAL; | |
2804 | } | |
2805 | ||
892782ca MC |
2806 | ret = kstrtou8(page, 0, &val); |
2807 | if (ret < 0) | |
2808 | return ret; | |
2809 | ||
2810 | if (val != 1 && val != 2) { | |
2811 | pr_err("Invalid reset ring value %d\n", val); | |
2812 | return -EINVAL; | |
2813 | } | |
2814 | ||
2815 | tcmu_reset_ring(udev, val); | |
2816 | return count; | |
2817 | } | |
2818 | CONFIGFS_ATTR_WO(tcmu_, reset_ring); | |
2819 | ||
5821783b | 2820 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 2821 | &tcmu_attr_cmd_time_out, |
9103575a | 2822 | &tcmu_attr_qfull_time_out, |
80eb8761 | 2823 | &tcmu_attr_max_data_area_mb, |
2d76443e | 2824 | &tcmu_attr_dev_config, |
801fc54d BL |
2825 | &tcmu_attr_dev_size, |
2826 | &tcmu_attr_emulate_write_cache, | |
59526d7a | 2827 | &tcmu_attr_tmr_notification, |
b849b456 | 2828 | &tcmu_attr_nl_reply_supported, |
801fc54d BL |
2829 | NULL, |
2830 | }; | |
2831 | ||
7d7a7435 NB |
2832 | static struct configfs_attribute **tcmu_attrs; |
2833 | ||
892782ca MC |
2834 | static struct configfs_attribute *tcmu_action_attrs[] = { |
2835 | &tcmu_attr_block_dev, | |
2836 | &tcmu_attr_reset_ring, | |
2837 | NULL, | |
2838 | }; | |
2839 | ||
7d7a7435 | 2840 | static struct target_backend_ops tcmu_ops = { |
7c9e7a6f | 2841 | .name = "user", |
7c9e7a6f | 2842 | .owner = THIS_MODULE, |
69088a04 | 2843 | .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, |
356ba2a8 BS |
2844 | .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | |
2845 | TRANSPORT_FLAG_PASSTHROUGH_ALUA, | |
7c9e7a6f AG |
2846 | .attach_hba = tcmu_attach_hba, |
2847 | .detach_hba = tcmu_detach_hba, | |
2848 | .alloc_device = tcmu_alloc_device, | |
2849 | .configure_device = tcmu_configure_device, | |
92634706 | 2850 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
2851 | .free_device = tcmu_free_device, |
2852 | .parse_cdb = tcmu_parse_cdb, | |
bc2d214a | 2853 | .tmr_notify = tcmu_tmr_notify, |
7c9e7a6f AG |
2854 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, |
2855 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
2856 | .get_device_type = sbc_get_device_type, | |
2857 | .get_blocks = tcmu_get_blocks, | |
892782ca | 2858 | .tb_dev_action_attrs = tcmu_action_attrs, |
7c9e7a6f AG |
2859 | }; |
2860 | ||
89ec9cfd | 2861 | static void find_free_blocks(void) |
b6df4b79 XL |
2862 | { |
2863 | struct tcmu_dev *udev; | |
2864 | loff_t off; | |
af1dd7ff MC |
2865 | u32 start, end, block, total_freed = 0; |
2866 | ||
80eb8761 | 2867 | if (atomic_read(&global_db_count) <= tcmu_global_max_blocks) |
af1dd7ff | 2868 | return; |
b6df4b79 | 2869 | |
89ec9cfd MC |
2870 | mutex_lock(&root_udev_mutex); |
2871 | list_for_each_entry(udev, &root_udev, node) { | |
2872 | mutex_lock(&udev->cmdr_lock); | |
b6df4b79 | 2873 | |
dc335a99 MC |
2874 | if (!target_dev_configured(&udev->se_dev)) { |
2875 | mutex_unlock(&udev->cmdr_lock); | |
2876 | continue; | |
2877 | } | |
2878 | ||
89ec9cfd | 2879 | /* Try to complete the finished commands first */ |
bc2d214a BS |
2880 | if (tcmu_handle_completions(udev)) |
2881 | run_qfull_queue(udev, false); | |
d906d8af | 2882 | |
af1dd7ff MC |
2883 | /* Skip the udevs in idle */ |
2884 | if (!udev->dbi_thresh) { | |
89ec9cfd MC |
2885 | mutex_unlock(&udev->cmdr_lock); |
2886 | continue; | |
2887 | } | |
b6df4b79 | 2888 | |
89ec9cfd MC |
2889 | end = udev->dbi_max + 1; |
2890 | block = find_last_bit(udev->data_bitmap, end); | |
2891 | if (block == udev->dbi_max) { | |
2892 | /* | |
af1dd7ff MC |
2893 | * The last bit is dbi_max, so it is not possible |
2894 | * reclaim any blocks. | |
89ec9cfd MC |
2895 | */ |
2896 | mutex_unlock(&udev->cmdr_lock); | |
2897 | continue; | |
2898 | } else if (block == end) { | |
2899 | /* The current udev will goto idle state */ | |
2900 | udev->dbi_thresh = start = 0; | |
2901 | udev->dbi_max = 0; | |
2902 | } else { | |
2903 | udev->dbi_thresh = start = block + 1; | |
2904 | udev->dbi_max = block; | |
2905 | } | |
b6df4b79 | 2906 | |
89ec9cfd MC |
2907 | /* Here will truncate the data area from off */ |
2908 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
2909 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
b6df4b79 | 2910 | |
89ec9cfd MC |
2911 | /* Release the block pages */ |
2912 | tcmu_blocks_release(&udev->data_blocks, start, end); | |
2913 | mutex_unlock(&udev->cmdr_lock); | |
b6df4b79 | 2914 | |
af1dd7ff MC |
2915 | total_freed += end - start; |
2916 | pr_debug("Freed %u blocks (total %u) from %s.\n", end - start, | |
2917 | total_freed, udev->name); | |
89ec9cfd MC |
2918 | } |
2919 | mutex_unlock(&root_udev_mutex); | |
af1dd7ff | 2920 | |
80eb8761 | 2921 | if (atomic_read(&global_db_count) > tcmu_global_max_blocks) |
af1dd7ff | 2922 | schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); |
89ec9cfd MC |
2923 | } |
2924 | ||
488ebe4c MC |
2925 | static void check_timedout_devices(void) |
2926 | { | |
2927 | struct tcmu_dev *udev, *tmp_dev; | |
61fb2482 | 2928 | struct tcmu_cmd *cmd, *tmp_cmd; |
488ebe4c MC |
2929 | LIST_HEAD(devs); |
2930 | ||
2931 | spin_lock_bh(&timed_out_udevs_lock); | |
2932 | list_splice_init(&timed_out_udevs, &devs); | |
2933 | ||
2934 | list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { | |
2935 | list_del_init(&udev->timedout_entry); | |
2936 | spin_unlock_bh(&timed_out_udevs_lock); | |
2937 | ||
6fddcb77 | 2938 | mutex_lock(&udev->cmdr_lock); |
a94a2572 | 2939 | |
61fb2482 BS |
2940 | /* |
2941 | * If cmd_time_out is disabled but qfull is set deadline | |
2942 | * will only reflect the qfull timeout. Ignore it. | |
2943 | */ | |
2944 | if (udev->cmd_time_out) { | |
2945 | list_for_each_entry_safe(cmd, tmp_cmd, | |
2946 | &udev->inflight_queue, | |
2947 | queue_entry) { | |
2948 | tcmu_check_expired_ring_cmd(cmd); | |
2949 | } | |
2950 | tcmu_set_next_deadline(&udev->inflight_queue, | |
2951 | &udev->cmd_timer); | |
2952 | } | |
2953 | list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, | |
2954 | queue_entry) { | |
2955 | tcmu_check_expired_queue_cmd(cmd); | |
2956 | } | |
a94a2572 XL |
2957 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); |
2958 | ||
6fddcb77 | 2959 | mutex_unlock(&udev->cmdr_lock); |
488ebe4c MC |
2960 | |
2961 | spin_lock_bh(&timed_out_udevs_lock); | |
2962 | } | |
2963 | ||
2964 | spin_unlock_bh(&timed_out_udevs_lock); | |
2965 | } | |
2966 | ||
9972cebb | 2967 | static void tcmu_unmap_work_fn(struct work_struct *work) |
89ec9cfd | 2968 | { |
488ebe4c | 2969 | check_timedout_devices(); |
9972cebb | 2970 | find_free_blocks(); |
b6df4b79 XL |
2971 | } |
2972 | ||
7c9e7a6f AG |
2973 | static int __init tcmu_module_init(void) |
2974 | { | |
801fc54d | 2975 | int ret, i, k, len = 0; |
7c9e7a6f AG |
2976 | |
2977 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
2978 | ||
af1dd7ff | 2979 | INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); |
9972cebb | 2980 | |
7c9e7a6f AG |
2981 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", |
2982 | sizeof(struct tcmu_cmd), | |
2983 | __alignof__(struct tcmu_cmd), | |
2984 | 0, NULL); | |
2985 | if (!tcmu_cmd_cache) | |
2986 | return -ENOMEM; | |
2987 | ||
2988 | tcmu_root_device = root_device_register("tcm_user"); | |
2989 | if (IS_ERR(tcmu_root_device)) { | |
2990 | ret = PTR_ERR(tcmu_root_device); | |
2991 | goto out_free_cache; | |
2992 | } | |
2993 | ||
2994 | ret = genl_register_family(&tcmu_genl_family); | |
2995 | if (ret < 0) { | |
2996 | goto out_unreg_device; | |
2997 | } | |
2998 | ||
4703b625 | 2999 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
7d7a7435 | 3000 | len += sizeof(struct configfs_attribute *); |
4703b625 BS |
3001 | for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) |
3002 | len += sizeof(struct configfs_attribute *); | |
3003 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) | |
801fc54d | 3004 | len += sizeof(struct configfs_attribute *); |
801fc54d | 3005 | len += sizeof(struct configfs_attribute *); |
7d7a7435 NB |
3006 | |
3007 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
3008 | if (!tcmu_attrs) { | |
3009 | ret = -ENOMEM; | |
3010 | goto out_unreg_genl; | |
3011 | } | |
3012 | ||
4703b625 | 3013 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
7d7a7435 | 3014 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; |
4703b625 BS |
3015 | for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) |
3016 | tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; | |
3017 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) | |
3018 | tcmu_attrs[i++] = tcmu_attrib_attrs[k]; | |
7d7a7435 NB |
3019 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
3020 | ||
0a06d430 | 3021 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 3022 | if (ret) |
7d7a7435 | 3023 | goto out_attrs; |
7c9e7a6f AG |
3024 | |
3025 | return 0; | |
3026 | ||
7d7a7435 NB |
3027 | out_attrs: |
3028 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
3029 | out_unreg_genl: |
3030 | genl_unregister_family(&tcmu_genl_family); | |
3031 | out_unreg_device: | |
3032 | root_device_unregister(tcmu_root_device); | |
3033 | out_free_cache: | |
3034 | kmem_cache_destroy(tcmu_cmd_cache); | |
3035 | ||
3036 | return ret; | |
3037 | } | |
3038 | ||
3039 | static void __exit tcmu_module_exit(void) | |
3040 | { | |
af1dd7ff | 3041 | cancel_delayed_work_sync(&tcmu_unmap_work); |
0a06d430 | 3042 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 3043 | kfree(tcmu_attrs); |
7c9e7a6f AG |
3044 | genl_unregister_family(&tcmu_genl_family); |
3045 | root_device_unregister(tcmu_root_device); | |
3046 | kmem_cache_destroy(tcmu_cmd_cache); | |
3047 | } | |
3048 | ||
3049 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
3050 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
3051 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
3052 | MODULE_LICENSE("GPL"); | |
3053 | ||
3054 | module_init(tcmu_module_init); | |
3055 | module_exit(tcmu_module_exit); |