Commit | Line | Data |
---|---|---|
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> | |
ba929992 | 11 | #include <linux/kernel.h> |
7c9e7a6f AG |
12 | #include <linux/timer.h> |
13 | #include <linux/parser.h> | |
5538d294 | 14 | #include <linux/vmalloc.h> |
7c9e7a6f | 15 | #include <linux/uio_driver.h> |
d3cbb743 | 16 | #include <linux/xarray.h> |
ac64a2ce | 17 | #include <linux/stringify.h> |
26418649 | 18 | #include <linux/bitops.h> |
f5045724 | 19 | #include <linux/highmem.h> |
7d7a7435 | 20 | #include <linux/configfs.h> |
b6df4b79 | 21 | #include <linux/mutex.h> |
9972cebb | 22 | #include <linux/workqueue.h> |
bb9b9eb0 | 23 | #include <linux/pagemap.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 | ||
ecddbb7e | 64 | /* For mailbox plus cmd ring, the size is fixed 8MB */ |
c7ede4f0 | 65 | #define MB_CMDR_SIZE_DEF (8 * 1024 * 1024) |
ecddbb7e | 66 | /* Offset of cmd ring is size of mailbox */ |
c7ede4f0 GL |
67 | #define CMDR_OFF ((__u32)sizeof(struct tcmu_mailbox)) |
68 | #define CMDR_SIZE_DEF (MB_CMDR_SIZE_DEF - CMDR_OFF) | |
26418649 | 69 | |
b6df4b79 | 70 | /* |
f5ce815f BS |
71 | * For data area, the default block size is PAGE_SIZE and |
72 | * the default total size is 256K * PAGE_SIZE. | |
b6df4b79 | 73 | */ |
e719afdc | 74 | #define DATA_PAGES_PER_BLK_DEF 1 |
f5ce815f | 75 | #define DATA_AREA_PAGES_DEF (256 * 1024) |
7c9e7a6f | 76 | |
f5ce815f | 77 | #define TCMU_MBS_TO_PAGES(_mbs) ((size_t)_mbs << (20 - PAGE_SHIFT)) |
8b084d9d | 78 | #define TCMU_PAGES_TO_MBS(_pages) (_pages >> (20 - PAGE_SHIFT)) |
80eb8761 | 79 | |
af1dd7ff MC |
80 | /* |
81 | * Default number of global data blocks(512K * PAGE_SIZE) | |
82 | * when the unmap thread will be started. | |
83 | */ | |
8b084d9d | 84 | #define TCMU_GLOBAL_MAX_PAGES_DEF (512 * 1024) |
b6df4b79 | 85 | |
b3af66e2 | 86 | static u8 tcmu_kern_cmd_reply_supported; |
bdaeedc1 | 87 | static u8 tcmu_netlink_blocked; |
b3af66e2 | 88 | |
7c9e7a6f AG |
89 | static struct device *tcmu_root_device; |
90 | ||
91 | struct tcmu_hba { | |
92 | u32 host_id; | |
93 | }; | |
94 | ||
7c9e7a6f AG |
95 | #define TCMU_CONFIG_LEN 256 |
96 | ||
3228691f MC |
97 | static DEFINE_MUTEX(tcmu_nl_cmd_mutex); |
98 | static LIST_HEAD(tcmu_nl_cmd_list); | |
99 | ||
100 | struct tcmu_dev; | |
101 | ||
b3af66e2 MC |
102 | struct tcmu_nl_cmd { |
103 | /* wake up thread waiting for reply */ | |
104 | struct completion complete; | |
3228691f MC |
105 | struct list_head nl_list; |
106 | struct tcmu_dev *udev; | |
b3af66e2 MC |
107 | int cmd; |
108 | int status; | |
109 | }; | |
110 | ||
7c9e7a6f | 111 | struct tcmu_dev { |
b6df4b79 | 112 | struct list_head node; |
f3cdbe39 | 113 | struct kref kref; |
af1dd7ff | 114 | |
7c9e7a6f | 115 | struct se_device se_dev; |
6888da81 | 116 | struct se_dev_plug se_plug; |
7c9e7a6f AG |
117 | |
118 | char *name; | |
119 | struct se_hba *hba; | |
120 | ||
121 | #define TCMU_DEV_BIT_OPEN 0 | |
122 | #define TCMU_DEV_BIT_BROKEN 1 | |
892782ca | 123 | #define TCMU_DEV_BIT_BLOCKED 2 |
59526d7a | 124 | #define TCMU_DEV_BIT_TMR_NOTIFY 3 |
3ac0fcb4 | 125 | #define TCMU_DEV_BIT_PLUGGED 4 |
7c9e7a6f | 126 | unsigned long flags; |
7c9e7a6f AG |
127 | |
128 | struct uio_info uio_info; | |
129 | ||
b6df4b79 XL |
130 | struct inode *inode; |
131 | ||
0e0d7526 | 132 | uint64_t dev_size; |
ecddbb7e BS |
133 | |
134 | struct tcmu_mailbox *mb_addr; | |
135 | void *cmdr; | |
7c9e7a6f AG |
136 | u32 cmdr_size; |
137 | u32 cmdr_last_cleaned; | |
3d9b9555 | 138 | /* Offset of data area from start of mb */ |
26418649 | 139 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f | 140 | size_t data_off; |
f5ce815f | 141 | int data_area_mb; |
80eb8761 | 142 | uint32_t max_blocks; |
ecddbb7e | 143 | size_t mmap_pages; |
26418649 | 144 | |
b6df4b79 | 145 | struct mutex cmdr_lock; |
a94a2572 | 146 | struct list_head qfull_queue; |
bc2d214a | 147 | struct list_head tmr_queue; |
7c9e7a6f | 148 | |
141685a3 | 149 | uint32_t dbi_max; |
b6df4b79 | 150 | uint32_t dbi_thresh; |
80eb8761 | 151 | unsigned long *data_bitmap; |
8b084d9d | 152 | struct xarray data_pages; |
e719afdc BS |
153 | uint32_t data_pages_per_blk; |
154 | uint32_t data_blk_size; | |
141685a3 | 155 | |
d3cbb743 | 156 | struct xarray commands; |
7c9e7a6f | 157 | |
9103575a | 158 | struct timer_list cmd_timer; |
af980e46 | 159 | unsigned int cmd_time_out; |
a94a2572 | 160 | struct list_head inflight_queue; |
9103575a MC |
161 | |
162 | struct timer_list qfull_timer; | |
163 | int qfull_time_out; | |
164 | ||
488ebe4c | 165 | struct list_head timedout_entry; |
7c9e7a6f | 166 | |
b3af66e2 | 167 | struct tcmu_nl_cmd curr_nl_cmd; |
b3af66e2 | 168 | |
7c9e7a6f | 169 | char dev_config[TCMU_CONFIG_LEN]; |
b849b456 KN |
170 | |
171 | int nl_reply_supported; | |
7c9e7a6f AG |
172 | }; |
173 | ||
174 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
175 | ||
7c9e7a6f AG |
176 | struct tcmu_cmd { |
177 | struct se_cmd *se_cmd; | |
178 | struct tcmu_dev *tcmu_dev; | |
a94a2572 | 179 | struct list_head queue_entry; |
7c9e7a6f AG |
180 | |
181 | uint16_t cmd_id; | |
182 | ||
26418649 | 183 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 184 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 | 185 | uint32_t dbi_cnt; |
52ef2743 | 186 | uint32_t dbi_bidi_cnt; |
141685a3 XL |
187 | uint32_t dbi_cur; |
188 | uint32_t *dbi; | |
7c9e7a6f | 189 | |
3c9a7c58 BS |
190 | uint32_t data_len_bidi; |
191 | ||
7c9e7a6f AG |
192 | unsigned long deadline; |
193 | ||
194 | #define TCMU_CMD_BIT_EXPIRED 0 | |
018c1491 | 195 | #define TCMU_CMD_BIT_KEEP_BUF 1 |
7c9e7a6f AG |
196 | unsigned long flags; |
197 | }; | |
bc2d214a BS |
198 | |
199 | struct tcmu_tmr { | |
200 | struct list_head queue_entry; | |
201 | ||
202 | uint8_t tmr_type; | |
203 | uint32_t tmr_cmd_cnt; | |
8fdaabe1 | 204 | int16_t tmr_cmd_ids[]; |
bc2d214a BS |
205 | }; |
206 | ||
af1dd7ff MC |
207 | /* |
208 | * To avoid dead lock the mutex lock order should always be: | |
209 | * | |
210 | * mutex_lock(&root_udev_mutex); | |
211 | * ... | |
212 | * mutex_lock(&tcmu_dev->cmdr_lock); | |
213 | * mutex_unlock(&tcmu_dev->cmdr_lock); | |
214 | * ... | |
215 | * mutex_unlock(&root_udev_mutex); | |
216 | */ | |
b6df4b79 XL |
217 | static DEFINE_MUTEX(root_udev_mutex); |
218 | static LIST_HEAD(root_udev); | |
219 | ||
488ebe4c MC |
220 | static DEFINE_SPINLOCK(timed_out_udevs_lock); |
221 | static LIST_HEAD(timed_out_udevs); | |
222 | ||
80eb8761 MC |
223 | static struct kmem_cache *tcmu_cmd_cache; |
224 | ||
8b084d9d | 225 | static atomic_t global_page_count = ATOMIC_INIT(0); |
af1dd7ff | 226 | static struct delayed_work tcmu_unmap_work; |
8b084d9d | 227 | static int tcmu_global_max_pages = TCMU_GLOBAL_MAX_PAGES_DEF; |
b6df4b79 | 228 | |
80eb8761 MC |
229 | static int tcmu_set_global_max_data_area(const char *str, |
230 | const struct kernel_param *kp) | |
231 | { | |
232 | int ret, max_area_mb; | |
233 | ||
234 | ret = kstrtoint(str, 10, &max_area_mb); | |
235 | if (ret) | |
236 | return -EINVAL; | |
237 | ||
238 | if (max_area_mb <= 0) { | |
239 | pr_err("global_max_data_area must be larger than 0.\n"); | |
240 | return -EINVAL; | |
241 | } | |
242 | ||
8b084d9d BS |
243 | tcmu_global_max_pages = TCMU_MBS_TO_PAGES(max_area_mb); |
244 | if (atomic_read(&global_page_count) > tcmu_global_max_pages) | |
80eb8761 MC |
245 | schedule_delayed_work(&tcmu_unmap_work, 0); |
246 | else | |
247 | cancel_delayed_work_sync(&tcmu_unmap_work); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | static int tcmu_get_global_max_data_area(char *buffer, | |
253 | const struct kernel_param *kp) | |
254 | { | |
8b084d9d | 255 | return sprintf(buffer, "%d\n", TCMU_PAGES_TO_MBS(tcmu_global_max_pages)); |
80eb8761 MC |
256 | } |
257 | ||
258 | static const struct kernel_param_ops tcmu_global_max_data_area_op = { | |
259 | .set = tcmu_set_global_max_data_area, | |
260 | .get = tcmu_get_global_max_data_area, | |
261 | }; | |
262 | ||
263 | module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL, | |
264 | S_IWUSR | S_IRUGO); | |
265 | MODULE_PARM_DESC(global_max_data_area_mb, | |
266 | "Max MBs allowed to be allocated to all the tcmu device's " | |
267 | "data areas."); | |
7c9e7a6f | 268 | |
bdaeedc1 MC |
269 | static int tcmu_get_block_netlink(char *buffer, |
270 | const struct kernel_param *kp) | |
271 | { | |
272 | return sprintf(buffer, "%s\n", tcmu_netlink_blocked ? | |
273 | "blocked" : "unblocked"); | |
274 | } | |
275 | ||
276 | static int tcmu_set_block_netlink(const char *str, | |
277 | const struct kernel_param *kp) | |
278 | { | |
279 | int ret; | |
280 | u8 val; | |
281 | ||
282 | ret = kstrtou8(str, 0, &val); | |
283 | if (ret < 0) | |
284 | return ret; | |
285 | ||
286 | if (val > 1) { | |
287 | pr_err("Invalid block netlink value %u\n", val); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
291 | tcmu_netlink_blocked = val; | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static const struct kernel_param_ops tcmu_block_netlink_op = { | |
296 | .set = tcmu_set_block_netlink, | |
297 | .get = tcmu_get_block_netlink, | |
298 | }; | |
299 | ||
300 | module_param_cb(block_netlink, &tcmu_block_netlink_op, NULL, S_IWUSR | S_IRUGO); | |
301 | MODULE_PARM_DESC(block_netlink, "Block new netlink commands."); | |
302 | ||
303 | static int tcmu_fail_netlink_cmd(struct tcmu_nl_cmd *nl_cmd) | |
304 | { | |
305 | struct tcmu_dev *udev = nl_cmd->udev; | |
306 | ||
307 | if (!tcmu_netlink_blocked) { | |
308 | pr_err("Could not reset device's netlink interface. Netlink is not blocked.\n"); | |
309 | return -EBUSY; | |
310 | } | |
311 | ||
312 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
313 | pr_debug("Aborting nl cmd %d on %s\n", nl_cmd->cmd, udev->name); | |
314 | nl_cmd->status = -EINTR; | |
315 | list_del(&nl_cmd->nl_list); | |
316 | complete(&nl_cmd->complete); | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int tcmu_set_reset_netlink(const char *str, | |
322 | const struct kernel_param *kp) | |
323 | { | |
324 | struct tcmu_nl_cmd *nl_cmd, *tmp_cmd; | |
325 | int ret; | |
326 | u8 val; | |
327 | ||
328 | ret = kstrtou8(str, 0, &val); | |
329 | if (ret < 0) | |
330 | return ret; | |
331 | ||
332 | if (val != 1) { | |
333 | pr_err("Invalid reset netlink value %u\n", val); | |
334 | return -EINVAL; | |
335 | } | |
336 | ||
337 | mutex_lock(&tcmu_nl_cmd_mutex); | |
338 | list_for_each_entry_safe(nl_cmd, tmp_cmd, &tcmu_nl_cmd_list, nl_list) { | |
339 | ret = tcmu_fail_netlink_cmd(nl_cmd); | |
340 | if (ret) | |
341 | break; | |
342 | } | |
343 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | static const struct kernel_param_ops tcmu_reset_netlink_op = { | |
349 | .set = tcmu_set_reset_netlink, | |
350 | }; | |
351 | ||
352 | module_param_cb(reset_netlink, &tcmu_reset_netlink_op, NULL, S_IWUSR); | |
353 | MODULE_PARM_DESC(reset_netlink, "Reset netlink commands."); | |
354 | ||
7c9e7a6f AG |
355 | /* multicast group */ |
356 | enum tcmu_multicast_groups { | |
357 | TCMU_MCGRP_CONFIG, | |
358 | }; | |
359 | ||
360 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
361 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
362 | }; | |
363 | ||
b3af66e2 MC |
364 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
365 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
366 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
367 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
368 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
369 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
370 | }; | |
371 | ||
372 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
373 | { | |
3228691f | 374 | struct tcmu_dev *udev = NULL; |
b3af66e2 MC |
375 | struct tcmu_nl_cmd *nl_cmd; |
376 | int dev_id, rc, ret = 0; | |
b3af66e2 MC |
377 | |
378 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
379 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
380 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
9554c1be | 381 | return -EINVAL; |
b3af66e2 MC |
382 | } |
383 | ||
384 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
385 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
386 | ||
3228691f MC |
387 | mutex_lock(&tcmu_nl_cmd_mutex); |
388 | list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) { | |
389 | if (nl_cmd->udev->se_dev.dev_index == dev_id) { | |
390 | udev = nl_cmd->udev; | |
391 | break; | |
392 | } | |
b3af66e2 | 393 | } |
b3af66e2 | 394 | |
3228691f | 395 | if (!udev) { |
0c218e16 | 396 | pr_err("tcmu nl cmd %u/%d completion could not find device with dev id %u.\n", |
3228691f MC |
397 | completed_cmd, rc, dev_id); |
398 | ret = -ENODEV; | |
399 | goto unlock; | |
400 | } | |
401 | list_del(&nl_cmd->nl_list); | |
b3af66e2 | 402 | |
bdaeedc1 MC |
403 | pr_debug("%s genl cmd done got id %d curr %d done %d rc %d stat %d\n", |
404 | udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc, | |
405 | nl_cmd->status); | |
b3af66e2 MC |
406 | |
407 | if (nl_cmd->cmd != completed_cmd) { | |
3228691f MC |
408 | pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n", |
409 | udev->name, completed_cmd, nl_cmd->cmd); | |
b3af66e2 | 410 | ret = -EINVAL; |
3228691f | 411 | goto unlock; |
b3af66e2 MC |
412 | } |
413 | ||
3228691f MC |
414 | nl_cmd->status = rc; |
415 | complete(&nl_cmd->complete); | |
416 | unlock: | |
417 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
b3af66e2 MC |
418 | return ret; |
419 | } | |
420 | ||
421 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
422 | { | |
423 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
424 | } | |
425 | ||
426 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
427 | { | |
428 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
429 | } | |
430 | ||
431 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
432 | struct genl_info *info) | |
433 | { | |
434 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
435 | } | |
436 | ||
437 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
438 | { | |
439 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
440 | tcmu_kern_cmd_reply_supported = | |
441 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
442 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
443 | tcmu_kern_cmd_reply_supported); | |
444 | } | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
66a9b928 | 449 | static const struct genl_small_ops tcmu_genl_ops[] = { |
b3af66e2 MC |
450 | { |
451 | .cmd = TCMU_CMD_SET_FEATURES, | |
ef6243ac | 452 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 453 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
454 | .doit = tcmu_genl_set_features, |
455 | }, | |
456 | { | |
457 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
ef6243ac | 458 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 459 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
460 | .doit = tcmu_genl_add_dev_done, |
461 | }, | |
462 | { | |
463 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
ef6243ac | 464 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 465 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
466 | .doit = tcmu_genl_rm_dev_done, |
467 | }, | |
468 | { | |
469 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
ef6243ac | 470 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
b3af66e2 | 471 | .flags = GENL_ADMIN_PERM, |
b3af66e2 MC |
472 | .doit = tcmu_genl_reconfig_dev_done, |
473 | }, | |
474 | }; | |
475 | ||
7c9e7a6f | 476 | /* Our generic netlink family */ |
56989f6d | 477 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 478 | .module = THIS_MODULE, |
7c9e7a6f AG |
479 | .hdrsize = 0, |
480 | .name = "TCM-USER", | |
b3af66e2 | 481 | .version = 2, |
7c9e7a6f | 482 | .maxattr = TCMU_ATTR_MAX, |
3b0f31f2 | 483 | .policy = tcmu_attr_policy, |
7c9e7a6f AG |
484 | .mcgrps = tcmu_mcgrps, |
485 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 486 | .netnsok = true, |
66a9b928 JK |
487 | .small_ops = tcmu_genl_ops, |
488 | .n_small_ops = ARRAY_SIZE(tcmu_genl_ops), | |
9c5d03d3 | 489 | .resv_start_op = TCMU_CMD_SET_FEATURES + 1, |
7c9e7a6f AG |
490 | }; |
491 | ||
141685a3 XL |
492 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
493 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
494 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
495 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
496 | ||
b6df4b79 | 497 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
498 | { |
499 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
500 | uint32_t i; | |
501 | ||
b6df4b79 | 502 | for (i = 0; i < len; i++) |
141685a3 XL |
503 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
504 | } | |
505 | ||
7e98905e BS |
506 | static inline int tcmu_get_empty_block(struct tcmu_dev *udev, |
507 | struct tcmu_cmd *tcmu_cmd, | |
f5ce815f | 508 | int prev_dbi, int length, int *iov_cnt) |
141685a3 | 509 | { |
f5ce815f | 510 | XA_STATE(xas, &udev->data_pages, 0); |
b6df4b79 | 511 | struct page *page; |
e719afdc | 512 | int i, cnt, dbi, dpi; |
f5ce815f | 513 | int page_cnt = DIV_ROUND_UP(length, PAGE_SIZE); |
141685a3 | 514 | |
b6df4b79 XL |
515 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
516 | if (dbi == udev->dbi_thresh) | |
7e98905e | 517 | return -1; |
141685a3 | 518 | |
e719afdc | 519 | dpi = dbi * udev->data_pages_per_blk; |
f5ce815f | 520 | /* Count the number of already allocated pages */ |
e719afdc | 521 | xas_set(&xas, dpi); |
b4150b68 | 522 | rcu_read_lock(); |
f5ce815f BS |
523 | for (cnt = 0; xas_next(&xas) && cnt < page_cnt;) |
524 | cnt++; | |
b4150b68 | 525 | rcu_read_unlock(); |
141685a3 | 526 | |
f5ce815f | 527 | for (i = cnt; i < page_cnt; i++) { |
1d2ac7b6 BS |
528 | /* try to get new zeroed page from the mm */ |
529 | page = alloc_page(GFP_NOIO | __GFP_ZERO); | |
b6df4b79 | 530 | if (!page) |
f5ce815f | 531 | break; |
b6df4b79 | 532 | |
e719afdc | 533 | if (xa_store(&udev->data_pages, dpi + i, page, GFP_NOIO)) { |
f5ce815f BS |
534 | __free_page(page); |
535 | break; | |
536 | } | |
141685a3 | 537 | } |
f5ce815f BS |
538 | if (atomic_add_return(i - cnt, &global_page_count) > |
539 | tcmu_global_max_pages) | |
540 | schedule_delayed_work(&tcmu_unmap_work, 0); | |
141685a3 | 541 | |
f5ce815f | 542 | if (i && dbi > udev->dbi_max) |
b6df4b79 XL |
543 | udev->dbi_max = dbi; |
544 | ||
545 | set_bit(dbi, udev->data_bitmap); | |
546 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
547 | ||
7e98905e BS |
548 | if (dbi != prev_dbi + 1) |
549 | *iov_cnt += 1; | |
550 | ||
f5ce815f | 551 | return i == page_cnt ? dbi : -1; |
141685a3 XL |
552 | } |
553 | ||
7e98905e | 554 | static int tcmu_get_empty_blocks(struct tcmu_dev *udev, |
f5ce815f | 555 | struct tcmu_cmd *tcmu_cmd, int length) |
b6df4b79 | 556 | { |
7e98905e BS |
557 | /* start value of dbi + 1 must not be a valid dbi */ |
558 | int dbi = -2; | |
e719afdc BS |
559 | int blk_data_len, iov_cnt = 0; |
560 | uint32_t blk_size = udev->data_blk_size; | |
7e98905e | 561 | |
e719afdc BS |
562 | for (; length > 0; length -= blk_size) { |
563 | blk_data_len = min_t(uint32_t, length, blk_size); | |
564 | dbi = tcmu_get_empty_block(udev, tcmu_cmd, dbi, blk_data_len, | |
565 | &iov_cnt); | |
7e98905e BS |
566 | if (dbi < 0) |
567 | return -1; | |
b6df4b79 | 568 | } |
7e98905e | 569 | return iov_cnt; |
b6df4b79 XL |
570 | } |
571 | ||
141685a3 XL |
572 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) |
573 | { | |
574 | kfree(tcmu_cmd->dbi); | |
575 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
576 | } | |
577 | ||
52ef2743 | 578 | static inline void tcmu_cmd_set_block_cnts(struct tcmu_cmd *cmd) |
141685a3 | 579 | { |
52ef2743 BS |
580 | int i, len; |
581 | struct se_cmd *se_cmd = cmd->se_cmd; | |
e719afdc | 582 | uint32_t blk_size = cmd->tcmu_dev->data_blk_size; |
52ef2743 | 583 | |
e719afdc | 584 | cmd->dbi_cnt = DIV_ROUND_UP(se_cmd->data_length, blk_size); |
141685a3 XL |
585 | |
586 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
587 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
52ef2743 BS |
588 | for (i = 0, len = 0; i < se_cmd->t_bidi_data_nents; i++) |
589 | len += se_cmd->t_bidi_data_sg[i].length; | |
e719afdc | 590 | cmd->dbi_bidi_cnt = DIV_ROUND_UP(len, blk_size); |
52ef2743 | 591 | cmd->dbi_cnt += cmd->dbi_bidi_cnt; |
3c9a7c58 | 592 | cmd->data_len_bidi = len; |
141685a3 | 593 | } |
141685a3 XL |
594 | } |
595 | ||
3c9a7c58 | 596 | static int new_block_to_iov(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
c8ed1ff8 | 597 | struct iovec **iov, int prev_dbi, int len) |
3c9a7c58 BS |
598 | { |
599 | /* Get the next dbi */ | |
600 | int dbi = tcmu_cmd_get_dbi(cmd); | |
c8ed1ff8 | 601 | |
e719afdc BS |
602 | /* Do not add more than udev->data_blk_size to iov */ |
603 | len = min_t(int, len, udev->data_blk_size); | |
3c9a7c58 | 604 | |
3c9a7c58 BS |
605 | /* |
606 | * The following code will gather and map the blocks to the same iovec | |
607 | * when the blocks are all next to each other. | |
608 | */ | |
609 | if (dbi != prev_dbi + 1) { | |
610 | /* dbi is not next to previous dbi, so start new iov */ | |
611 | if (prev_dbi >= 0) | |
612 | (*iov)++; | |
613 | /* write offset relative to mb_addr */ | |
614 | (*iov)->iov_base = (void __user *) | |
e719afdc | 615 | (udev->data_off + dbi * udev->data_blk_size); |
3c9a7c58 BS |
616 | } |
617 | (*iov)->iov_len += len; | |
618 | ||
619 | return dbi; | |
620 | } | |
621 | ||
622 | static void tcmu_setup_iovs(struct tcmu_dev *udev, struct tcmu_cmd *cmd, | |
623 | struct iovec **iov, int data_length) | |
624 | { | |
625 | /* start value of dbi + 1 must not be a valid dbi */ | |
626 | int dbi = -2; | |
627 | ||
628 | /* We prepare the IOVs for DMA_FROM_DEVICE transfer direction */ | |
e719afdc | 629 | for (; data_length > 0; data_length -= udev->data_blk_size) |
c8ed1ff8 | 630 | dbi = new_block_to_iov(udev, cmd, iov, dbi, data_length); |
3c9a7c58 BS |
631 | } |
632 | ||
7c9e7a6f AG |
633 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
634 | { | |
635 | struct se_device *se_dev = se_cmd->se_dev; | |
636 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
637 | struct tcmu_cmd *tcmu_cmd; | |
7c9e7a6f | 638 | |
0eccce86 | 639 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_NOIO); |
7c9e7a6f AG |
640 | if (!tcmu_cmd) |
641 | return NULL; | |
642 | ||
a94a2572 | 643 | INIT_LIST_HEAD(&tcmu_cmd->queue_entry); |
7c9e7a6f AG |
644 | tcmu_cmd->se_cmd = se_cmd; |
645 | tcmu_cmd->tcmu_dev = udev; | |
7c9e7a6f | 646 | |
52ef2743 | 647 | tcmu_cmd_set_block_cnts(tcmu_cmd); |
141685a3 | 648 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), |
0eccce86 | 649 | GFP_NOIO); |
141685a3 XL |
650 | if (!tcmu_cmd->dbi) { |
651 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
652 | return NULL; | |
653 | } | |
654 | ||
7c9e7a6f AG |
655 | return tcmu_cmd; |
656 | } | |
657 | ||
658 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
659 | { | |
b75d8063 | 660 | unsigned long offset = offset_in_page(vaddr); |
26d2b310 | 661 | void *start = vaddr - offset; |
7c9e7a6f AG |
662 | |
663 | size = round_up(size+offset, PAGE_SIZE); | |
7c9e7a6f AG |
664 | |
665 | while (size) { | |
3145550a | 666 | flush_dcache_page(vmalloc_to_page(start)); |
26d2b310 | 667 | start += PAGE_SIZE; |
7c9e7a6f AG |
668 | size -= PAGE_SIZE; |
669 | } | |
670 | } | |
671 | ||
672 | /* | |
673 | * Some ring helper functions. We don't assume size is a power of 2 so | |
674 | * we can't use circ_buf.h. | |
675 | */ | |
676 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
677 | { | |
678 | int diff = head - tail; | |
679 | ||
680 | if (diff >= 0) | |
681 | return diff; | |
682 | else | |
683 | return size + diff; | |
684 | } | |
685 | ||
686 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
687 | { | |
688 | /* Keep 1 byte unused or we can't tell full from empty */ | |
689 | return (size - spc_used(head, tail, size) - 1); | |
690 | } | |
691 | ||
692 | static inline size_t head_to_end(size_t head, size_t size) | |
693 | { | |
694 | return size - head; | |
695 | } | |
696 | ||
697 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) | |
698 | ||
c8ed1ff8 BS |
699 | #define TCMU_SG_TO_DATA_AREA 1 |
700 | #define TCMU_DATA_AREA_TO_SG 2 | |
701 | ||
702 | static inline void tcmu_copy_data(struct tcmu_dev *udev, | |
703 | struct tcmu_cmd *tcmu_cmd, uint32_t direction, | |
704 | struct scatterlist *sg, unsigned int sg_nents, | |
705 | struct iovec **iov, size_t data_len) | |
26418649 | 706 | { |
3c9a7c58 | 707 | /* start value of dbi + 1 must not be a valid dbi */ |
c8ed1ff8 | 708 | int dbi = -2; |
f5ce815f | 709 | size_t page_remaining, cp_len; |
b4150b68 | 710 | int page_cnt, page_inx, dpi; |
c8ed1ff8 BS |
711 | struct sg_mapping_iter sg_iter; |
712 | unsigned int sg_flags; | |
713 | struct page *page; | |
714 | void *data_page_start, *data_addr; | |
3e609135 | 715 | |
c8ed1ff8 BS |
716 | if (direction == TCMU_SG_TO_DATA_AREA) |
717 | sg_flags = SG_MITER_ATOMIC | SG_MITER_FROM_SG; | |
718 | else | |
719 | sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; | |
720 | sg_miter_start(&sg_iter, sg, sg_nents, sg_flags); | |
721 | ||
722 | while (data_len) { | |
723 | if (direction == TCMU_SG_TO_DATA_AREA) | |
724 | dbi = new_block_to_iov(udev, tcmu_cmd, iov, dbi, | |
725 | data_len); | |
726 | else | |
727 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); | |
f5ce815f BS |
728 | |
729 | page_cnt = DIV_ROUND_UP(data_len, PAGE_SIZE); | |
e719afdc BS |
730 | if (page_cnt > udev->data_pages_per_blk) |
731 | page_cnt = udev->data_pages_per_blk; | |
f5ce815f | 732 | |
b4150b68 BS |
733 | dpi = dbi * udev->data_pages_per_blk; |
734 | for (page_inx = 0; page_inx < page_cnt && data_len; | |
735 | page_inx++, dpi++) { | |
736 | page = xa_load(&udev->data_pages, dpi); | |
f5ce815f BS |
737 | |
738 | if (direction == TCMU_DATA_AREA_TO_SG) | |
739 | flush_dcache_page(page); | |
740 | data_page_start = kmap_atomic(page); | |
741 | page_remaining = PAGE_SIZE; | |
742 | ||
743 | while (page_remaining && data_len) { | |
744 | if (!sg_miter_next(&sg_iter)) { | |
745 | /* set length to 0 to abort outer loop */ | |
746 | data_len = 0; | |
747 | pr_debug("%s: aborting data copy due to exhausted sg_list\n", | |
748 | __func__); | |
749 | break; | |
750 | } | |
751 | cp_len = min3(sg_iter.length, page_remaining, | |
752 | data_len); | |
753 | ||
754 | data_addr = data_page_start + | |
755 | PAGE_SIZE - page_remaining; | |
756 | if (direction == TCMU_SG_TO_DATA_AREA) | |
757 | memcpy(data_addr, sg_iter.addr, cp_len); | |
758 | else | |
759 | memcpy(sg_iter.addr, data_addr, cp_len); | |
760 | ||
761 | data_len -= cp_len; | |
762 | page_remaining -= cp_len; | |
763 | sg_iter.consumed = cp_len; | |
c8ed1ff8 | 764 | } |
f5ce815f | 765 | sg_miter_stop(&sg_iter); |
c8ed1ff8 | 766 | |
f5ce815f | 767 | kunmap_atomic(data_page_start); |
c8ed1ff8 | 768 | if (direction == TCMU_SG_TO_DATA_AREA) |
f5ce815f | 769 | flush_dcache_page(page); |
f97ec7db | 770 | } |
3c58f737 | 771 | } |
0c28481f SY |
772 | } |
773 | ||
c8ed1ff8 BS |
774 | static void scatter_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, |
775 | struct iovec **iov) | |
776 | { | |
777 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
778 | ||
779 | tcmu_copy_data(udev, tcmu_cmd, TCMU_SG_TO_DATA_AREA, se_cmd->t_data_sg, | |
780 | se_cmd->t_data_nents, iov, se_cmd->data_length); | |
781 | } | |
782 | ||
783 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *tcmu_cmd, | |
6c3796d1 | 784 | bool bidi, uint32_t read_len) |
f97ec7db | 785 | { |
c8ed1ff8 BS |
786 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; |
787 | struct scatterlist *data_sg; | |
a5d68ba8 | 788 | unsigned int data_nents; |
a5d68ba8 XL |
789 | |
790 | if (!bidi) { | |
791 | data_sg = se_cmd->t_data_sg; | |
792 | data_nents = se_cmd->t_data_nents; | |
793 | } else { | |
a5d68ba8 XL |
794 | /* |
795 | * For bidi case, the first count blocks are for Data-Out | |
796 | * buffer blocks, and before gathering the Data-In buffer | |
52ef2743 | 797 | * the Data-Out buffer blocks should be skipped. |
a5d68ba8 | 798 | */ |
c8ed1ff8 BS |
799 | tcmu_cmd_set_dbi_cur(tcmu_cmd, |
800 | tcmu_cmd->dbi_cnt - tcmu_cmd->dbi_bidi_cnt); | |
a5d68ba8 XL |
801 | |
802 | data_sg = se_cmd->t_bidi_data_sg; | |
803 | data_nents = se_cmd->t_bidi_data_nents; | |
804 | } | |
f97ec7db | 805 | |
c8ed1ff8 BS |
806 | tcmu_copy_data(udev, tcmu_cmd, TCMU_DATA_AREA_TO_SG, data_sg, |
807 | data_nents, NULL, read_len); | |
f97ec7db IT |
808 | } |
809 | ||
b6df4b79 | 810 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 811 | { |
3c0f26ff | 812 | return thresh - bitmap_weight(bitmap, thresh); |
26418649 SY |
813 | } |
814 | ||
7c9e7a6f | 815 | /* |
7e98905e | 816 | * We can't queue a command until we have space available on the cmd ring. |
7c9e7a6f AG |
817 | * |
818 | * Called with ring lock held. | |
819 | */ | |
7e98905e | 820 | static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size) |
7c9e7a6f AG |
821 | { |
822 | struct tcmu_mailbox *mb = udev->mb_addr; | |
0241fd39 | 823 | size_t space, cmd_needed; |
7c9e7a6f AG |
824 | u32 cmd_head; |
825 | ||
826 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
827 | ||
828 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
829 | ||
f56574a2 AG |
830 | /* |
831 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
832 | * original cmd - cmds are internally contiguous. | |
833 | */ | |
834 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
835 | cmd_needed = cmd_size; | |
836 | else | |
837 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
838 | ||
7c9e7a6f AG |
839 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
840 | if (space < cmd_needed) { | |
841 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
842 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
843 | return false; | |
844 | } | |
7e98905e BS |
845 | return true; |
846 | } | |
7c9e7a6f | 847 | |
7e98905e BS |
848 | /* |
849 | * We have to allocate data buffers before we can queue a command. | |
850 | * Returns -1 on error (not enough space) or number of needed iovs on success | |
851 | * | |
852 | * Called with ring lock held. | |
853 | */ | |
854 | static int tcmu_alloc_data_space(struct tcmu_dev *udev, struct tcmu_cmd *cmd, | |
855 | int *iov_bidi_cnt) | |
856 | { | |
857 | int space, iov_cnt = 0, ret = 0; | |
858 | ||
859 | if (!cmd->dbi_cnt) | |
860 | goto wr_iov_cnts; | |
bc2d214a | 861 | |
b6df4b79 XL |
862 | /* try to check and get the data blocks as needed */ |
863 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
52ef2743 | 864 | if (space < cmd->dbi_cnt) { |
80eb8761 MC |
865 | unsigned long blocks_left = |
866 | (udev->max_blocks - udev->dbi_thresh) + space; | |
b6df4b79 | 867 | |
52ef2743 | 868 | if (blocks_left < cmd->dbi_cnt) { |
e719afdc BS |
869 | pr_debug("no data space: only %lu available, but ask for %u\n", |
870 | blocks_left * udev->data_blk_size, | |
871 | cmd->dbi_cnt * udev->data_blk_size); | |
7e98905e | 872 | return -1; |
b6df4b79 XL |
873 | } |
874 | ||
52ef2743 | 875 | udev->dbi_thresh += cmd->dbi_cnt; |
80eb8761 MC |
876 | if (udev->dbi_thresh > udev->max_blocks) |
877 | udev->dbi_thresh = udev->max_blocks; | |
7c9e7a6f AG |
878 | } |
879 | ||
f5ce815f | 880 | iov_cnt = tcmu_get_empty_blocks(udev, cmd, cmd->se_cmd->data_length); |
7e98905e BS |
881 | if (iov_cnt < 0) |
882 | return -1; | |
883 | ||
884 | if (cmd->dbi_bidi_cnt) { | |
f5ce815f | 885 | ret = tcmu_get_empty_blocks(udev, cmd, cmd->data_len_bidi); |
7e98905e BS |
886 | if (ret < 0) |
887 | return -1; | |
888 | } | |
889 | wr_iov_cnts: | |
890 | *iov_bidi_cnt = ret; | |
891 | return iov_cnt + ret; | |
7c9e7a6f AG |
892 | } |
893 | ||
fe25cc34 XL |
894 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
895 | { | |
896 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
897 | sizeof(struct tcmu_cmd_entry)); | |
898 | } | |
899 | ||
900 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
901 | size_t base_command_size) | |
902 | { | |
903 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
904 | size_t command_size; | |
905 | ||
906 | command_size = base_command_size + | |
907 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
908 | TCMU_OP_ALIGN_SIZE); | |
909 | ||
910 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
911 | ||
912 | return command_size; | |
913 | } | |
914 | ||
61fb2482 BS |
915 | static void tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo, |
916 | struct timer_list *timer) | |
0d44374c | 917 | { |
9103575a | 918 | if (!tmo) |
61fb2482 | 919 | return; |
9103575a | 920 | |
0d44374c | 921 | tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); |
a94a2572 XL |
922 | if (!timer_pending(timer)) |
923 | mod_timer(timer, tcmu_cmd->deadline); | |
924 | ||
61fb2482 BS |
925 | pr_debug("Timeout set up for cmd %p, dev = %s, tmo = %lu\n", tcmu_cmd, |
926 | tcmu_cmd->tcmu_dev->name, tmo / MSEC_PER_SEC); | |
0d44374c MC |
927 | } |
928 | ||
a94a2572 | 929 | static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) |
af1dd7ff MC |
930 | { |
931 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
9103575a | 932 | unsigned int tmo; |
af1dd7ff | 933 | |
9103575a MC |
934 | /* |
935 | * For backwards compat if qfull_time_out is not set use | |
936 | * cmd_time_out and if that's not set use the default time out. | |
937 | */ | |
938 | if (!udev->qfull_time_out) | |
939 | return -ETIMEDOUT; | |
940 | else if (udev->qfull_time_out > 0) | |
941 | tmo = udev->qfull_time_out; | |
942 | else if (udev->cmd_time_out) | |
943 | tmo = udev->cmd_time_out; | |
944 | else | |
945 | tmo = TCMU_TIME_OUT; | |
946 | ||
61fb2482 | 947 | tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer); |
af1dd7ff | 948 | |
a94a2572 | 949 | list_add_tail(&tcmu_cmd->queue_entry, &udev->qfull_queue); |
61fb2482 BS |
950 | pr_debug("adding cmd %p on dev %s to ring space wait queue\n", |
951 | tcmu_cmd, udev->name); | |
af1dd7ff MC |
952 | return 0; |
953 | } | |
954 | ||
3d3f9d56 BS |
955 | static uint32_t ring_insert_padding(struct tcmu_dev *udev, size_t cmd_size) |
956 | { | |
957 | struct tcmu_cmd_entry_hdr *hdr; | |
958 | struct tcmu_mailbox *mb = udev->mb_addr; | |
959 | uint32_t cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
960 | ||
961 | /* Insert a PAD if end-of-ring space is too small */ | |
962 | if (head_to_end(cmd_head, udev->cmdr_size) < cmd_size) { | |
963 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
964 | ||
ecddbb7e | 965 | hdr = udev->cmdr + cmd_head; |
3d3f9d56 BS |
966 | tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); |
967 | tcmu_hdr_set_len(&hdr->len_op, pad_size); | |
968 | hdr->cmd_id = 0; /* not used for PAD */ | |
969 | hdr->kflags = 0; | |
970 | hdr->uflags = 0; | |
971 | tcmu_flush_dcache_range(hdr, sizeof(*hdr)); | |
972 | ||
973 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
974 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
975 | ||
976 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
977 | WARN_ON(cmd_head != 0); | |
978 | } | |
979 | ||
980 | return cmd_head; | |
981 | } | |
982 | ||
6888da81 MC |
983 | static void tcmu_unplug_device(struct se_dev_plug *se_plug) |
984 | { | |
985 | struct se_device *se_dev = se_plug->se_dev; | |
986 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
987 | ||
3ac0fcb4 | 988 | clear_bit(TCMU_DEV_BIT_PLUGGED, &udev->flags); |
6888da81 MC |
989 | uio_event_notify(&udev->uio_info); |
990 | } | |
991 | ||
992 | static struct se_dev_plug *tcmu_plug_device(struct se_device *se_dev) | |
993 | { | |
994 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
995 | ||
3ac0fcb4 | 996 | if (!test_and_set_bit(TCMU_DEV_BIT_PLUGGED, &udev->flags)) |
6888da81 MC |
997 | return &udev->se_plug; |
998 | ||
999 | return NULL; | |
1000 | } | |
1001 | ||
6fd0ce79 MC |
1002 | /** |
1003 | * queue_cmd_ring - queue cmd to ring or internally | |
1004 | * @tcmu_cmd: cmd to queue | |
1005 | * @scsi_err: TCM error code if failure (-1) returned. | |
1006 | * | |
1007 | * Returns: | |
1008 | * -1 we cannot queue internally or to the ring. | |
1009 | * 0 success | |
af1dd7ff | 1010 | * 1 internally queued to wait for ring memory to free. |
6fd0ce79 | 1011 | */ |
e7f41104 | 1012 | static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) |
7c9e7a6f AG |
1013 | { |
1014 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
1015 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
1016 | size_t base_command_size, command_size; | |
3d3f9d56 | 1017 | struct tcmu_mailbox *mb = udev->mb_addr; |
7c9e7a6f | 1018 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 1019 | struct iovec *iov; |
d3cbb743 BS |
1020 | int iov_cnt, iov_bidi_cnt; |
1021 | uint32_t cmd_id, cmd_head; | |
7c9e7a6f | 1022 | uint64_t cdb_off; |
e719afdc | 1023 | uint32_t blk_size = udev->data_blk_size; |
52ef2743 | 1024 | /* size of data buffer needed */ |
e719afdc | 1025 | size_t data_length = (size_t)tcmu_cmd->dbi_cnt * blk_size; |
7c9e7a6f | 1026 | |
6fd0ce79 MC |
1027 | *scsi_err = TCM_NO_SENSE; |
1028 | ||
892782ca MC |
1029 | if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) { |
1030 | *scsi_err = TCM_LUN_BUSY; | |
1031 | return -1; | |
1032 | } | |
1033 | ||
6fd0ce79 MC |
1034 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { |
1035 | *scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1036 | return -1; | |
1037 | } | |
7c9e7a6f | 1038 | |
7e98905e BS |
1039 | if (!list_empty(&udev->qfull_queue)) |
1040 | goto queue; | |
1041 | ||
e719afdc | 1042 | if (data_length > (size_t)udev->max_blocks * blk_size) { |
7e98905e | 1043 | pr_warn("TCMU: Request of size %zu is too big for %zu data area\n", |
e719afdc | 1044 | data_length, (size_t)udev->max_blocks * blk_size); |
7e98905e BS |
1045 | *scsi_err = TCM_INVALID_CDB_FIELD; |
1046 | return -1; | |
1047 | } | |
1048 | ||
1049 | iov_cnt = tcmu_alloc_data_space(udev, tcmu_cmd, &iov_bidi_cnt); | |
1050 | if (iov_cnt < 0) | |
1051 | goto free_and_queue; | |
1052 | ||
7c9e7a6f AG |
1053 | /* |
1054 | * Must be a certain minimum size for response sense info, but | |
1055 | * also may be larger if the iov array is large. | |
fe25cc34 | 1056 | */ |
7e98905e | 1057 | base_command_size = tcmu_cmd_get_base_cmd_size(iov_cnt); |
fe25cc34 | 1058 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); |
7c9e7a6f | 1059 | |
7e98905e BS |
1060 | if (command_size > (udev->cmdr_size / 2)) { |
1061 | pr_warn("TCMU: Request of size %zu is too big for %u cmd ring\n", | |
1062 | command_size, udev->cmdr_size); | |
1063 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); | |
6fd0ce79 MC |
1064 | *scsi_err = TCM_INVALID_CDB_FIELD; |
1065 | return -1; | |
554617b2 | 1066 | } |
7c9e7a6f | 1067 | |
7e98905e | 1068 | if (!is_ring_space_avail(udev, command_size)) |
810b8153 MC |
1069 | /* |
1070 | * Don't leave commands partially setup because the unmap | |
1071 | * thread might need the blocks to make forward progress. | |
1072 | */ | |
7e98905e BS |
1073 | goto free_and_queue; |
1074 | ||
d3cbb743 BS |
1075 | if (xa_alloc(&udev->commands, &cmd_id, tcmu_cmd, XA_LIMIT(1, 0xffff), |
1076 | GFP_NOWAIT) < 0) { | |
7e98905e BS |
1077 | pr_err("tcmu: Could not allocate cmd id.\n"); |
1078 | ||
1079 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); | |
1080 | *scsi_err = TCM_OUT_OF_RESOURCES; | |
1081 | return -1; | |
7c9e7a6f | 1082 | } |
7e98905e BS |
1083 | tcmu_cmd->cmd_id = cmd_id; |
1084 | ||
1085 | pr_debug("allocated cmd id %u for cmd %p dev %s\n", tcmu_cmd->cmd_id, | |
1086 | tcmu_cmd, udev->name); | |
7c9e7a6f | 1087 | |
3d3f9d56 | 1088 | cmd_head = ring_insert_padding(udev, command_size); |
7c9e7a6f | 1089 | |
ecddbb7e | 1090 | entry = udev->cmdr + cmd_head; |
b3743c71 | 1091 | memset(entry, 0, command_size); |
0ad46af8 | 1092 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
7c9e7a6f | 1093 | |
7e98905e | 1094 | /* prepare iov list and copy data to data area if necessary */ |
b6df4b79 | 1095 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 1096 | iov = &entry->req.iov[0]; |
3c9a7c58 BS |
1097 | |
1098 | if (se_cmd->data_direction == DMA_TO_DEVICE || | |
1099 | se_cmd->se_cmd_flags & SCF_BIDI) | |
1100 | scatter_data_area(udev, tcmu_cmd, &iov); | |
1101 | else | |
1102 | tcmu_setup_iovs(udev, tcmu_cmd, &iov, se_cmd->data_length); | |
1103 | ||
7e98905e | 1104 | entry->req.iov_cnt = iov_cnt - iov_bidi_cnt; |
7c9e7a6f | 1105 | |
e4648b01 | 1106 | /* Handle BIDI commands */ |
ab22d260 | 1107 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 1108 | iov++; |
3c9a7c58 | 1109 | tcmu_setup_iovs(udev, tcmu_cmd, &iov, tcmu_cmd->data_len_bidi); |
7e98905e | 1110 | entry->req.iov_bidi_cnt = iov_bidi_cnt; |
ab22d260 | 1111 | } |
61fb2482 BS |
1112 | |
1113 | tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out, &udev->cmd_timer); | |
1114 | ||
0d44374c MC |
1115 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; |
1116 | ||
fe25cc34 XL |
1117 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); |
1118 | ||
7c9e7a6f AG |
1119 | /* All offsets relative to mb_addr, not start of entry! */ |
1120 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
1121 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
1122 | entry->req.cdb_off = cdb_off; | |
8c4e0f21 | 1123 | tcmu_flush_dcache_range(entry, command_size); |
7c9e7a6f AG |
1124 | |
1125 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
1126 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
7c9e7a6f | 1127 | |
a94a2572 | 1128 | list_add_tail(&tcmu_cmd->queue_entry, &udev->inflight_queue); |
a94a2572 | 1129 | |
3ac0fcb4 | 1130 | if (!test_bit(TCMU_DEV_BIT_PLUGGED, &udev->flags)) |
6888da81 | 1131 | uio_event_notify(&udev->uio_info); |
7c9e7a6f | 1132 | |
6fd0ce79 | 1133 | return 0; |
af1dd7ff | 1134 | |
7e98905e BS |
1135 | free_and_queue: |
1136 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); | |
1137 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); | |
1138 | ||
af1dd7ff | 1139 | queue: |
a94a2572 | 1140 | if (add_to_qfull_queue(tcmu_cmd)) { |
af1dd7ff MC |
1141 | *scsi_err = TCM_OUT_OF_RESOURCES; |
1142 | return -1; | |
1143 | } | |
1144 | ||
1145 | return 1; | |
7c9e7a6f AG |
1146 | } |
1147 | ||
bc2d214a BS |
1148 | /** |
1149 | * queue_tmr_ring - queue tmr info to ring or internally | |
1150 | * @udev: related tcmu_dev | |
1151 | * @tmr: tcmu_tmr containing tmr info to queue | |
1152 | * | |
1153 | * Returns: | |
1154 | * 0 success | |
1155 | * 1 internally queued to wait for ring memory to free. | |
1156 | */ | |
1157 | static int | |
1158 | queue_tmr_ring(struct tcmu_dev *udev, struct tcmu_tmr *tmr) | |
1159 | { | |
1160 | struct tcmu_tmr_entry *entry; | |
1161 | int cmd_size; | |
1162 | int id_list_sz; | |
1163 | struct tcmu_mailbox *mb = udev->mb_addr; | |
1164 | uint32_t cmd_head; | |
1165 | ||
1166 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
1167 | goto out_free; | |
1168 | ||
1169 | id_list_sz = sizeof(tmr->tmr_cmd_ids[0]) * tmr->tmr_cmd_cnt; | |
1170 | cmd_size = round_up(sizeof(*entry) + id_list_sz, TCMU_OP_ALIGN_SIZE); | |
1171 | ||
1172 | if (!list_empty(&udev->tmr_queue) || | |
7e98905e | 1173 | !is_ring_space_avail(udev, cmd_size)) { |
bc2d214a BS |
1174 | list_add_tail(&tmr->queue_entry, &udev->tmr_queue); |
1175 | pr_debug("adding tmr %p on dev %s to TMR ring space wait queue\n", | |
1176 | tmr, udev->name); | |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | cmd_head = ring_insert_padding(udev, cmd_size); | |
1181 | ||
ecddbb7e | 1182 | entry = udev->cmdr + cmd_head; |
bc2d214a BS |
1183 | memset(entry, 0, cmd_size); |
1184 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_TMR); | |
1185 | tcmu_hdr_set_len(&entry->hdr.len_op, cmd_size); | |
1186 | entry->tmr_type = tmr->tmr_type; | |
1187 | entry->cmd_cnt = tmr->tmr_cmd_cnt; | |
1188 | memcpy(&entry->cmd_ids[0], &tmr->tmr_cmd_ids[0], id_list_sz); | |
1189 | tcmu_flush_dcache_range(entry, cmd_size); | |
1190 | ||
1191 | UPDATE_HEAD(mb->cmd_head, cmd_size, udev->cmdr_size); | |
1192 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1193 | ||
1194 | uio_event_notify(&udev->uio_info); | |
1195 | ||
1196 | out_free: | |
1197 | kfree(tmr); | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
02eb924f AG |
1202 | static sense_reason_t |
1203 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f | 1204 | { |
af1dd7ff MC |
1205 | struct se_device *se_dev = se_cmd->se_dev; |
1206 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
7c9e7a6f | 1207 | struct tcmu_cmd *tcmu_cmd; |
c9684927 BS |
1208 | sense_reason_t scsi_ret = TCM_CHECK_CONDITION_ABORT_CMD; |
1209 | int ret = -1; | |
7c9e7a6f AG |
1210 | |
1211 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
1212 | if (!tcmu_cmd) | |
02eb924f | 1213 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f | 1214 | |
af1dd7ff | 1215 | mutex_lock(&udev->cmdr_lock); |
c9684927 BS |
1216 | if (!(se_cmd->transport_state & CMD_T_ABORTED)) |
1217 | ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); | |
af1dd7ff | 1218 | if (ret < 0) |
141685a3 | 1219 | tcmu_free_cmd(tcmu_cmd); |
780e1384 SK |
1220 | else |
1221 | se_cmd->priv = tcmu_cmd; | |
a3512902 | 1222 | mutex_unlock(&udev->cmdr_lock); |
6fd0ce79 | 1223 | return scsi_ret; |
7c9e7a6f AG |
1224 | } |
1225 | ||
ed212ca8 BS |
1226 | static void tcmu_set_next_deadline(struct list_head *queue, |
1227 | struct timer_list *timer) | |
1228 | { | |
1229 | struct tcmu_cmd *cmd; | |
1230 | ||
1231 | if (!list_empty(queue)) { | |
1232 | cmd = list_first_entry(queue, struct tcmu_cmd, queue_entry); | |
1233 | mod_timer(timer, cmd->deadline); | |
1234 | } else | |
1235 | del_timer(timer); | |
1236 | } | |
1237 | ||
bc2d214a BS |
1238 | static int |
1239 | tcmu_tmr_type(enum tcm_tmreq_table tmf) | |
1240 | { | |
1241 | switch (tmf) { | |
1242 | case TMR_ABORT_TASK: return TCMU_TMR_ABORT_TASK; | |
1243 | case TMR_ABORT_TASK_SET: return TCMU_TMR_ABORT_TASK_SET; | |
1244 | case TMR_CLEAR_ACA: return TCMU_TMR_CLEAR_ACA; | |
1245 | case TMR_CLEAR_TASK_SET: return TCMU_TMR_CLEAR_TASK_SET; | |
1246 | case TMR_LUN_RESET: return TCMU_TMR_LUN_RESET; | |
1247 | case TMR_TARGET_WARM_RESET: return TCMU_TMR_TARGET_WARM_RESET; | |
1248 | case TMR_TARGET_COLD_RESET: return TCMU_TMR_TARGET_COLD_RESET; | |
1249 | case TMR_LUN_RESET_PRO: return TCMU_TMR_LUN_RESET_PRO; | |
1250 | default: return TCMU_TMR_UNKNOWN; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | static void | |
1255 | tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, | |
1256 | struct list_head *cmd_list) | |
1257 | { | |
1258 | int i = 0, cmd_cnt = 0; | |
1259 | bool unqueued = false; | |
bc2d214a BS |
1260 | struct tcmu_cmd *cmd; |
1261 | struct se_cmd *se_cmd; | |
1262 | struct tcmu_tmr *tmr; | |
1263 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
1264 | ||
1265 | mutex_lock(&udev->cmdr_lock); | |
1266 | ||
1267 | /* First we check for aborted commands in qfull_queue */ | |
1268 | list_for_each_entry(se_cmd, cmd_list, state_list) { | |
1269 | i++; | |
1270 | if (!se_cmd->priv) | |
1271 | continue; | |
1272 | cmd = se_cmd->priv; | |
1273 | /* Commands on qfull queue have no id yet */ | |
1274 | if (cmd->cmd_id) { | |
1275 | cmd_cnt++; | |
1276 | continue; | |
1277 | } | |
1278 | pr_debug("Removing aborted command %p from queue on dev %s.\n", | |
1279 | cmd, udev->name); | |
1280 | ||
1281 | list_del_init(&cmd->queue_entry); | |
1282 | tcmu_free_cmd(cmd); | |
780e1384 | 1283 | se_cmd->priv = NULL; |
bc2d214a BS |
1284 | target_complete_cmd(se_cmd, SAM_STAT_TASK_ABORTED); |
1285 | unqueued = true; | |
1286 | } | |
1287 | if (unqueued) | |
1288 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); | |
1289 | ||
59526d7a BS |
1290 | if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) |
1291 | goto unlock; | |
1292 | ||
bc2d214a BS |
1293 | pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", |
1294 | tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); | |
1295 | ||
c20bda34 | 1296 | tmr = kmalloc(struct_size(tmr, tmr_cmd_ids, cmd_cnt), GFP_NOIO); |
bc2d214a BS |
1297 | if (!tmr) |
1298 | goto unlock; | |
1299 | ||
1300 | tmr->tmr_type = tcmu_tmr_type(tmf); | |
1301 | tmr->tmr_cmd_cnt = cmd_cnt; | |
1302 | ||
1303 | if (cmd_cnt != 0) { | |
1304 | cmd_cnt = 0; | |
1305 | list_for_each_entry(se_cmd, cmd_list, state_list) { | |
1306 | if (!se_cmd->priv) | |
1307 | continue; | |
1308 | cmd = se_cmd->priv; | |
1309 | if (cmd->cmd_id) | |
1310 | tmr->tmr_cmd_ids[cmd_cnt++] = cmd->cmd_id; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | queue_tmr_ring(udev, tmr); | |
1315 | ||
1316 | unlock: | |
1317 | mutex_unlock(&udev->cmdr_lock); | |
1318 | } | |
1319 | ||
018c1491 BS |
1320 | static bool tcmu_handle_completion(struct tcmu_cmd *cmd, |
1321 | struct tcmu_cmd_entry *entry, bool keep_buf) | |
7c9e7a6f AG |
1322 | { |
1323 | struct se_cmd *se_cmd = cmd->se_cmd; | |
1324 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
6c3796d1 | 1325 | bool read_len_valid = false; |
018c1491 | 1326 | bool ret = true; |
a86a7586 | 1327 | uint32_t read_len; |
7c9e7a6f | 1328 | |
141685a3 XL |
1329 | /* |
1330 | * cmd has been completed already from timeout, just reclaim | |
1331 | * data area space and free cmd | |
1332 | */ | |
a86a7586 DF |
1333 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
1334 | WARN_ON_ONCE(se_cmd); | |
141685a3 | 1335 | goto out; |
a86a7586 | 1336 | } |
018c1491 BS |
1337 | if (test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags)) { |
1338 | pr_err("cmd_id %u already completed with KEEP_BUF, ring is broken\n", | |
1339 | entry->hdr.cmd_id); | |
1340 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1341 | ret = false; | |
1342 | goto out; | |
1343 | } | |
b25c7863 | 1344 | |
a94a2572 XL |
1345 | list_del_init(&cmd->queue_entry); |
1346 | ||
141685a3 | 1347 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 1348 | |
0ad46af8 | 1349 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
1350 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
1351 | cmd->se_cmd); | |
ed97d0cd | 1352 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
6c3796d1 | 1353 | goto done; |
1354 | } | |
1355 | ||
a86a7586 | 1356 | read_len = se_cmd->data_length; |
6c3796d1 | 1357 | if (se_cmd->data_direction == DMA_FROM_DEVICE && |
1358 | (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) { | |
1359 | read_len_valid = true; | |
1360 | if (entry->rsp.read_len < read_len) | |
1361 | read_len = entry->rsp.read_len; | |
1362 | } | |
1363 | ||
1364 | if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 1365 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
6c3796d1 | 1366 | if (!read_len_valid ) |
1367 | goto done; | |
1368 | else | |
1369 | se_cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL; | |
1370 | } | |
1371 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
26418649 | 1372 | /* Get Data-In buffer before clean up */ |
6c3796d1 | 1373 | gather_data_area(udev, cmd, true, read_len); |
e4648b01 | 1374 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
6c3796d1 | 1375 | gather_data_area(udev, cmd, false, read_len); |
7c9e7a6f | 1376 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 1377 | /* TODO: */ |
2bc396a2 IT |
1378 | } else if (se_cmd->data_direction != DMA_NONE) { |
1379 | pr_warn("TCMU: data direction was %d!\n", | |
1380 | se_cmd->data_direction); | |
7c9e7a6f AG |
1381 | } |
1382 | ||
6c3796d1 | 1383 | done: |
780e1384 | 1384 | se_cmd->priv = NULL; |
6c3796d1 | 1385 | if (read_len_valid) { |
1386 | pr_debug("read_len = %d\n", read_len); | |
1387 | target_complete_cmd_with_length(cmd->se_cmd, | |
1388 | entry->rsp.scsi_status, read_len); | |
1389 | } else | |
1390 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 1391 | |
141685a3 | 1392 | out: |
018c1491 BS |
1393 | if (!keep_buf) { |
1394 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); | |
1395 | tcmu_free_cmd(cmd); | |
1396 | } else { | |
1397 | /* | |
1398 | * Keep this command after completion, since userspace still | |
1399 | * needs the data buffer. Mark it with TCMU_CMD_BIT_KEEP_BUF | |
1400 | * and reset potential TCMU_CMD_BIT_EXPIRED, so we don't accept | |
1401 | * a second completion later. | |
1402 | * Userspace can free the buffer later by writing the cmd_id | |
1403 | * to new action attribute free_kept_buf. | |
1404 | */ | |
1405 | clear_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1406 | set_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags); | |
1407 | } | |
1408 | return ret; | |
7c9e7a6f AG |
1409 | } |
1410 | ||
bc2d214a BS |
1411 | static int tcmu_run_tmr_queue(struct tcmu_dev *udev) |
1412 | { | |
1413 | struct tcmu_tmr *tmr, *tmp; | |
1414 | LIST_HEAD(tmrs); | |
1415 | ||
1416 | if (list_empty(&udev->tmr_queue)) | |
1417 | return 1; | |
1418 | ||
1419 | pr_debug("running %s's tmr queue\n", udev->name); | |
1420 | ||
1421 | list_splice_init(&udev->tmr_queue, &tmrs); | |
1422 | ||
1423 | list_for_each_entry_safe(tmr, tmp, &tmrs, queue_entry) { | |
1424 | list_del_init(&tmr->queue_entry); | |
1425 | ||
1426 | pr_debug("removing tmr %p on dev %s from queue\n", | |
1427 | tmr, udev->name); | |
1428 | ||
1429 | if (queue_tmr_ring(udev, tmr)) { | |
1430 | pr_debug("ran out of space during tmr queue run\n"); | |
1431 | /* | |
1432 | * tmr was requeued, so just put all tmrs back in | |
1433 | * the queue | |
1434 | */ | |
1435 | list_splice_tail(&tmrs, &udev->tmr_queue); | |
1436 | return 0; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | return 1; | |
1441 | } | |
1442 | ||
9814b55c | 1443 | static bool tcmu_handle_completions(struct tcmu_dev *udev) |
7c9e7a6f AG |
1444 | { |
1445 | struct tcmu_mailbox *mb; | |
a94a2572 | 1446 | struct tcmu_cmd *cmd; |
bc2d214a | 1447 | bool free_space = false; |
7c9e7a6f AG |
1448 | |
1449 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
1450 | pr_err("ring broken, not handling completions\n"); | |
82473125 | 1451 | return false; |
7c9e7a6f AG |
1452 | } |
1453 | ||
7c9e7a6f AG |
1454 | mb = udev->mb_addr; |
1455 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1456 | ||
6aa7de05 | 1457 | while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
7c9e7a6f | 1458 | |
ecddbb7e | 1459 | struct tcmu_cmd_entry *entry = udev->cmdr + udev->cmdr_last_cleaned; |
018c1491 | 1460 | bool keep_buf; |
7c9e7a6f | 1461 | |
5a0c256d BS |
1462 | /* |
1463 | * Flush max. up to end of cmd ring since current entry might | |
1464 | * be a padding that is shorter than sizeof(*entry) | |
1465 | */ | |
1466 | size_t ring_left = head_to_end(udev->cmdr_last_cleaned, | |
1467 | udev->cmdr_size); | |
1468 | tcmu_flush_dcache_range(entry, ring_left < sizeof(*entry) ? | |
1469 | ring_left : sizeof(*entry)); | |
7c9e7a6f | 1470 | |
bc2d214a BS |
1471 | free_space = true; |
1472 | ||
1473 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD || | |
1474 | tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_TMR) { | |
0ad46af8 AG |
1475 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1476 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1477 | udev->cmdr_size); | |
7c9e7a6f AG |
1478 | continue; |
1479 | } | |
0ad46af8 | 1480 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f | 1481 | |
018c1491 BS |
1482 | keep_buf = !!(entry->hdr.uflags & TCMU_UFLAG_KEEP_BUF); |
1483 | if (keep_buf) | |
1484 | cmd = xa_load(&udev->commands, entry->hdr.cmd_id); | |
1485 | else | |
1486 | cmd = xa_erase(&udev->commands, entry->hdr.cmd_id); | |
7c9e7a6f | 1487 | if (!cmd) { |
88cf1073 MC |
1488 | pr_err("cmd_id %u not found, ring is broken\n", |
1489 | entry->hdr.cmd_id); | |
7c9e7a6f | 1490 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
9814b55c | 1491 | return false; |
7c9e7a6f AG |
1492 | } |
1493 | ||
018c1491 BS |
1494 | if (!tcmu_handle_completion(cmd, entry, keep_buf)) |
1495 | break; | |
7c9e7a6f | 1496 | |
0ad46af8 AG |
1497 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1498 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1499 | udev->cmdr_size); | |
7c9e7a6f | 1500 | } |
bc2d214a BS |
1501 | if (free_space) |
1502 | free_space = tcmu_run_tmr_queue(udev); | |
7c9e7a6f | 1503 | |
8b084d9d | 1504 | if (atomic_read(&global_page_count) > tcmu_global_max_pages && |
d3cbb743 | 1505 | xa_empty(&udev->commands) && list_empty(&udev->qfull_queue)) { |
ed212ca8 BS |
1506 | /* |
1507 | * Allocated blocks exceeded global block limit, currently no | |
1508 | * more pending or waiting commands so try to reclaim blocks. | |
1509 | */ | |
1510 | schedule_delayed_work(&tcmu_unmap_work, 0); | |
af1dd7ff | 1511 | } |
ed212ca8 BS |
1512 | if (udev->cmd_time_out) |
1513 | tcmu_set_next_deadline(&udev->inflight_queue, &udev->cmd_timer); | |
7c9e7a6f | 1514 | |
bc2d214a | 1515 | return free_space; |
7c9e7a6f AG |
1516 | } |
1517 | ||
61fb2482 | 1518 | static void tcmu_check_expired_ring_cmd(struct tcmu_cmd *cmd) |
7c9e7a6f | 1519 | { |
af1dd7ff | 1520 | struct se_cmd *se_cmd; |
7c9e7a6f | 1521 | |
ed212ca8 | 1522 | if (!time_after_eq(jiffies, cmd->deadline)) |
61fb2482 | 1523 | return; |
7c9e7a6f | 1524 | |
61fb2482 BS |
1525 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); |
1526 | list_del_init(&cmd->queue_entry); | |
45dc488c | 1527 | se_cmd = cmd->se_cmd; |
a3512902 | 1528 | se_cmd->priv = NULL; |
61fb2482 | 1529 | cmd->se_cmd = NULL; |
7c9e7a6f | 1530 | |
61fb2482 BS |
1531 | pr_debug("Timing out inflight cmd %u on dev %s.\n", |
1532 | cmd->cmd_id, cmd->tcmu_dev->name); | |
9103575a | 1533 | |
61fb2482 BS |
1534 | target_complete_cmd(se_cmd, SAM_STAT_CHECK_CONDITION); |
1535 | } | |
9103575a | 1536 | |
61fb2482 BS |
1537 | static void tcmu_check_expired_queue_cmd(struct tcmu_cmd *cmd) |
1538 | { | |
1539 | struct se_cmd *se_cmd; | |
9103575a | 1540 | |
ed212ca8 | 1541 | if (!time_after_eq(jiffies, cmd->deadline)) |
61fb2482 BS |
1542 | return; |
1543 | ||
9d7464b1 DC |
1544 | pr_debug("Timing out queued cmd %p on dev %s.\n", |
1545 | cmd, cmd->tcmu_dev->name); | |
1546 | ||
61fb2482 BS |
1547 | list_del_init(&cmd->queue_entry); |
1548 | se_cmd = cmd->se_cmd; | |
1549 | tcmu_free_cmd(cmd); | |
1550 | ||
780e1384 | 1551 | se_cmd->priv = NULL; |
61fb2482 | 1552 | target_complete_cmd(se_cmd, SAM_STAT_TASK_SET_FULL); |
7c9e7a6f AG |
1553 | } |
1554 | ||
9103575a | 1555 | static void tcmu_device_timedout(struct tcmu_dev *udev) |
7c9e7a6f | 1556 | { |
488ebe4c MC |
1557 | spin_lock(&timed_out_udevs_lock); |
1558 | if (list_empty(&udev->timedout_entry)) | |
1559 | list_add_tail(&udev->timedout_entry, &timed_out_udevs); | |
1560 | spin_unlock(&timed_out_udevs_lock); | |
b6df4b79 | 1561 | |
af1dd7ff | 1562 | schedule_delayed_work(&tcmu_unmap_work, 0); |
7c9e7a6f AG |
1563 | } |
1564 | ||
9103575a MC |
1565 | static void tcmu_cmd_timedout(struct timer_list *t) |
1566 | { | |
1567 | struct tcmu_dev *udev = from_timer(udev, t, cmd_timer); | |
1568 | ||
1569 | pr_debug("%s cmd timeout has expired\n", udev->name); | |
1570 | tcmu_device_timedout(udev); | |
1571 | } | |
1572 | ||
1573 | static void tcmu_qfull_timedout(struct timer_list *t) | |
1574 | { | |
1575 | struct tcmu_dev *udev = from_timer(udev, t, qfull_timer); | |
1576 | ||
1577 | pr_debug("%s qfull timeout has expired\n", udev->name); | |
1578 | tcmu_device_timedout(udev); | |
1579 | } | |
1580 | ||
7c9e7a6f AG |
1581 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) |
1582 | { | |
1583 | struct tcmu_hba *tcmu_hba; | |
1584 | ||
1585 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1586 | if (!tcmu_hba) | |
1587 | return -ENOMEM; | |
1588 | ||
1589 | tcmu_hba->host_id = host_id; | |
1590 | hba->hba_ptr = tcmu_hba; | |
1591 | ||
1592 | return 0; | |
1593 | } | |
1594 | ||
1595 | static void tcmu_detach_hba(struct se_hba *hba) | |
1596 | { | |
1597 | kfree(hba->hba_ptr); | |
1598 | hba->hba_ptr = NULL; | |
1599 | } | |
1600 | ||
1601 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1602 | { | |
1603 | struct tcmu_dev *udev; | |
1604 | ||
1605 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1606 | if (!udev) | |
1607 | return NULL; | |
f3cdbe39 | 1608 | kref_init(&udev->kref); |
7c9e7a6f AG |
1609 | |
1610 | udev->name = kstrdup(name, GFP_KERNEL); | |
1611 | if (!udev->name) { | |
1612 | kfree(udev); | |
1613 | return NULL; | |
1614 | } | |
1615 | ||
1616 | udev->hba = hba; | |
af980e46 | 1617 | udev->cmd_time_out = TCMU_TIME_OUT; |
9103575a | 1618 | udev->qfull_time_out = -1; |
7c9e7a6f | 1619 | |
e719afdc BS |
1620 | udev->data_pages_per_blk = DATA_PAGES_PER_BLK_DEF; |
1621 | udev->max_blocks = DATA_AREA_PAGES_DEF / udev->data_pages_per_blk; | |
c7ede4f0 | 1622 | udev->cmdr_size = CMDR_SIZE_DEF; |
f5ce815f | 1623 | udev->data_area_mb = TCMU_PAGES_TO_MBS(DATA_AREA_PAGES_DEF); |
e719afdc | 1624 | |
b6df4b79 | 1625 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f | 1626 | |
ff07e4a4 | 1627 | INIT_LIST_HEAD(&udev->node); |
488ebe4c | 1628 | INIT_LIST_HEAD(&udev->timedout_entry); |
a94a2572 | 1629 | INIT_LIST_HEAD(&udev->qfull_queue); |
bc2d214a | 1630 | INIT_LIST_HEAD(&udev->tmr_queue); |
a94a2572 | 1631 | INIT_LIST_HEAD(&udev->inflight_queue); |
d3cbb743 | 1632 | xa_init_flags(&udev->commands, XA_FLAGS_ALLOC1); |
7c9e7a6f | 1633 | |
9103575a MC |
1634 | timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); |
1635 | timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); | |
7c9e7a6f | 1636 | |
8b084d9d | 1637 | xa_init(&udev->data_pages); |
c22adc0b | 1638 | |
7c9e7a6f AG |
1639 | return &udev->se_dev; |
1640 | } | |
1641 | ||
43bf922c BS |
1642 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1643 | { | |
1644 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1645 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1646 | ||
1647 | kfree(udev->uio_info.name); | |
1648 | kfree(udev->name); | |
1649 | kfree(udev); | |
1650 | } | |
1651 | ||
1652 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) | |
1653 | { | |
018c1491 BS |
1654 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags) || |
1655 | test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags)) { | |
43bf922c BS |
1656 | kmem_cache_free(tcmu_cmd_cache, cmd); |
1657 | return 0; | |
1658 | } | |
1659 | return -EINVAL; | |
1660 | } | |
1661 | ||
e719afdc | 1662 | static u32 tcmu_blocks_release(struct tcmu_dev *udev, unsigned long first, |
f7c89771 | 1663 | unsigned long last) |
43bf922c | 1664 | { |
43bf922c | 1665 | struct page *page; |
325d5c5f | 1666 | unsigned long dpi; |
f5ce815f | 1667 | u32 pages_freed = 0; |
43bf922c | 1668 | |
325d5c5f BS |
1669 | first = first * udev->data_pages_per_blk; |
1670 | last = (last + 1) * udev->data_pages_per_blk - 1; | |
1671 | xa_for_each_range(&udev->data_pages, dpi, page, first, last) { | |
1672 | xa_erase(&udev->data_pages, dpi); | |
bb9b9eb0 XW |
1673 | /* |
1674 | * While reaching here there may be page faults occurring on | |
1675 | * the to-be-released pages. A race condition may occur if | |
1676 | * unmap_mapping_range() is called before page faults on these | |
1677 | * pages have completed; a valid but stale map is created. | |
1678 | * | |
1679 | * If another command subsequently runs and needs to extend | |
1680 | * dbi_thresh, it may reuse the slot corresponding to the | |
1681 | * previous page in data_bitmap. Though we will allocate a new | |
1682 | * page for the slot in data_area, no page fault will happen | |
1683 | * because we have a valid map. Therefore the command's data | |
1684 | * will be lost. | |
1685 | * | |
1686 | * We lock and unlock pages that are to be released to ensure | |
1687 | * all page faults have completed. This way | |
1688 | * unmap_mapping_range() can ensure stale maps are cleanly | |
1689 | * removed. | |
1690 | */ | |
1691 | lock_page(page); | |
1692 | unlock_page(page); | |
f7c89771 | 1693 | __free_page(page); |
f5ce815f | 1694 | pages_freed++; |
43bf922c | 1695 | } |
f5ce815f BS |
1696 | |
1697 | atomic_sub(pages_freed, &global_page_count); | |
1698 | ||
1699 | return pages_freed; | |
43bf922c BS |
1700 | } |
1701 | ||
1702 | static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) | |
1703 | { | |
1704 | struct tcmu_tmr *tmr, *tmp; | |
1705 | ||
1706 | list_for_each_entry_safe(tmr, tmp, &udev->tmr_queue, queue_entry) { | |
1707 | list_del_init(&tmr->queue_entry); | |
1708 | kfree(tmr); | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | static void tcmu_dev_kref_release(struct kref *kref) | |
1713 | { | |
1714 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1715 | struct se_device *dev = &udev->se_dev; | |
1716 | struct tcmu_cmd *cmd; | |
1717 | bool all_expired = true; | |
d3cbb743 | 1718 | unsigned long i; |
43bf922c BS |
1719 | |
1720 | vfree(udev->mb_addr); | |
1721 | udev->mb_addr = NULL; | |
1722 | ||
1723 | spin_lock_bh(&timed_out_udevs_lock); | |
1724 | if (!list_empty(&udev->timedout_entry)) | |
1725 | list_del(&udev->timedout_entry); | |
1726 | spin_unlock_bh(&timed_out_udevs_lock); | |
1727 | ||
1728 | /* Upper layer should drain all requests before calling this */ | |
1729 | mutex_lock(&udev->cmdr_lock); | |
d3cbb743 | 1730 | xa_for_each(&udev->commands, i, cmd) { |
43bf922c BS |
1731 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) |
1732 | all_expired = false; | |
1733 | } | |
1734 | /* There can be left over TMR cmds. Remove them. */ | |
1735 | tcmu_remove_all_queued_tmr(udev); | |
1736 | if (!list_empty(&udev->qfull_queue)) | |
1737 | all_expired = false; | |
d3cbb743 | 1738 | xa_destroy(&udev->commands); |
43bf922c BS |
1739 | WARN_ON(!all_expired); |
1740 | ||
e719afdc | 1741 | tcmu_blocks_release(udev, 0, udev->dbi_max); |
43bf922c BS |
1742 | bitmap_free(udev->data_bitmap); |
1743 | mutex_unlock(&udev->cmdr_lock); | |
1744 | ||
8f33bb24 BS |
1745 | pr_debug("dev_kref_release\n"); |
1746 | ||
43bf922c BS |
1747 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); |
1748 | } | |
1749 | ||
61fb2482 | 1750 | static void run_qfull_queue(struct tcmu_dev *udev, bool fail) |
af1dd7ff MC |
1751 | { |
1752 | struct tcmu_cmd *tcmu_cmd, *tmp_cmd; | |
1753 | LIST_HEAD(cmds); | |
af1dd7ff MC |
1754 | sense_reason_t scsi_ret; |
1755 | int ret; | |
1756 | ||
a94a2572 | 1757 | if (list_empty(&udev->qfull_queue)) |
61fb2482 | 1758 | return; |
af1dd7ff | 1759 | |
892782ca | 1760 | pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail); |
af1dd7ff | 1761 | |
a94a2572 | 1762 | list_splice_init(&udev->qfull_queue, &cmds); |
af1dd7ff | 1763 | |
a94a2572 XL |
1764 | list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, queue_entry) { |
1765 | list_del_init(&tcmu_cmd->queue_entry); | |
af1dd7ff | 1766 | |
61fb2482 BS |
1767 | pr_debug("removing cmd %p on dev %s from queue\n", |
1768 | tcmu_cmd, udev->name); | |
af1dd7ff | 1769 | |
892782ca | 1770 | if (fail) { |
892782ca MC |
1771 | /* |
1772 | * We were not able to even start the command, so | |
1773 | * fail with busy to allow a retry in case runner | |
1774 | * was only temporarily down. If the device is being | |
1775 | * removed then LIO core will do the right thing and | |
1776 | * fail the retry. | |
1777 | */ | |
780e1384 | 1778 | tcmu_cmd->se_cmd->priv = NULL; |
892782ca MC |
1779 | target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY); |
1780 | tcmu_free_cmd(tcmu_cmd); | |
1781 | continue; | |
1782 | } | |
1783 | ||
af1dd7ff MC |
1784 | ret = queue_cmd_ring(tcmu_cmd, &scsi_ret); |
1785 | if (ret < 0) { | |
61fb2482 BS |
1786 | pr_debug("cmd %p on dev %s failed with %u\n", |
1787 | tcmu_cmd, udev->name, scsi_ret); | |
af1dd7ff MC |
1788 | /* |
1789 | * Ignore scsi_ret for now. target_complete_cmd | |
1790 | * drops it. | |
1791 | */ | |
780e1384 | 1792 | tcmu_cmd->se_cmd->priv = NULL; |
af1dd7ff MC |
1793 | target_complete_cmd(tcmu_cmd->se_cmd, |
1794 | SAM_STAT_CHECK_CONDITION); | |
1795 | tcmu_free_cmd(tcmu_cmd); | |
1796 | } else if (ret > 0) { | |
1797 | pr_debug("ran out of space during cmdr queue run\n"); | |
1798 | /* | |
1799 | * cmd was requeued, so just put all cmds back in | |
1800 | * the queue | |
1801 | */ | |
a94a2572 | 1802 | list_splice_tail(&cmds, &udev->qfull_queue); |
a94a2572 | 1803 | break; |
af1dd7ff MC |
1804 | } |
1805 | } | |
a94a2572 XL |
1806 | |
1807 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); | |
af1dd7ff MC |
1808 | } |
1809 | ||
7c9e7a6f AG |
1810 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) |
1811 | { | |
af1dd7ff | 1812 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); |
7c9e7a6f | 1813 | |
af1dd7ff | 1814 | mutex_lock(&udev->cmdr_lock); |
bc2d214a BS |
1815 | if (tcmu_handle_completions(udev)) |
1816 | run_qfull_queue(udev, false); | |
af1dd7ff | 1817 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
1818 | |
1819 | return 0; | |
1820 | } | |
1821 | ||
1822 | /* | |
1823 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1824 | * and this stuff must come along. | |
1825 | */ | |
1826 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1827 | { | |
1828 | struct tcmu_dev *udev = vma->vm_private_data; | |
1829 | struct uio_info *info = &udev->uio_info; | |
1830 | ||
1831 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1832 | if (info->mem[vma->vm_pgoff].size == 0) | |
1833 | return -1; | |
1834 | return (int)vma->vm_pgoff; | |
1835 | } | |
1836 | return -1; | |
1837 | } | |
1838 | ||
8b084d9d | 1839 | static struct page *tcmu_try_get_data_page(struct tcmu_dev *udev, uint32_t dpi) |
b6df4b79 XL |
1840 | { |
1841 | struct page *page; | |
b6df4b79 XL |
1842 | |
1843 | mutex_lock(&udev->cmdr_lock); | |
3722e36c | 1844 | page = xa_load(&udev->data_pages, dpi); |
b6df4b79 | 1845 | if (likely(page)) { |
a6968f7a | 1846 | get_page(page); |
bb9b9eb0 | 1847 | lock_page(page); |
b6df4b79 XL |
1848 | mutex_unlock(&udev->cmdr_lock); |
1849 | return page; | |
1850 | } | |
1851 | ||
1852 | /* | |
c1c390ba MC |
1853 | * Userspace messed up and passed in a address not in the |
1854 | * data iov passed to it. | |
b6df4b79 | 1855 | */ |
8b084d9d BS |
1856 | pr_err("Invalid addr to data page mapping (dpi %u) on device %s\n", |
1857 | dpi, udev->name); | |
b6df4b79 XL |
1858 | mutex_unlock(&udev->cmdr_lock); |
1859 | ||
8b084d9d | 1860 | return NULL; |
b6df4b79 XL |
1861 | } |
1862 | ||
8f33bb24 BS |
1863 | static void tcmu_vma_open(struct vm_area_struct *vma) |
1864 | { | |
1865 | struct tcmu_dev *udev = vma->vm_private_data; | |
1866 | ||
1867 | pr_debug("vma_open\n"); | |
1868 | ||
1869 | kref_get(&udev->kref); | |
1870 | } | |
1871 | ||
1872 | static void tcmu_vma_close(struct vm_area_struct *vma) | |
1873 | { | |
1874 | struct tcmu_dev *udev = vma->vm_private_data; | |
1875 | ||
1876 | pr_debug("vma_close\n"); | |
1877 | ||
1878 | /* release ref from tcmu_vma_open */ | |
1879 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1880 | } | |
1881 | ||
69589c9b | 1882 | static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1883 | { |
11bac800 | 1884 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1885 | struct uio_info *info = &udev->uio_info; |
1886 | struct page *page; | |
1887 | unsigned long offset; | |
1888 | void *addr; | |
bb9b9eb0 | 1889 | vm_fault_t ret = 0; |
7c9e7a6f | 1890 | |
11bac800 | 1891 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1892 | if (mi < 0) |
1893 | return VM_FAULT_SIGBUS; | |
1894 | ||
1895 | /* | |
1896 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1897 | * to use mem[N]. | |
1898 | */ | |
1899 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1900 | ||
141685a3 XL |
1901 | if (offset < udev->data_off) { |
1902 | /* For the vmalloc()ed cmd area pages */ | |
1903 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1904 | page = vmalloc_to_page(addr); |
a6968f7a | 1905 | get_page(page); |
141685a3 | 1906 | } else { |
8b084d9d | 1907 | uint32_t dpi; |
141685a3 | 1908 | |
b6df4b79 | 1909 | /* For the dynamically growing data area pages */ |
8b084d9d BS |
1910 | dpi = (offset - udev->data_off) / PAGE_SIZE; |
1911 | page = tcmu_try_get_data_page(udev, dpi); | |
b6df4b79 | 1912 | if (!page) |
c1c390ba | 1913 | return VM_FAULT_SIGBUS; |
bb9b9eb0 | 1914 | ret = VM_FAULT_LOCKED; |
141685a3 XL |
1915 | } |
1916 | ||
7c9e7a6f | 1917 | vmf->page = page; |
bb9b9eb0 | 1918 | return ret; |
7c9e7a6f AG |
1919 | } |
1920 | ||
1921 | static const struct vm_operations_struct tcmu_vm_ops = { | |
8f33bb24 BS |
1922 | .open = tcmu_vma_open, |
1923 | .close = tcmu_vma_close, | |
7c9e7a6f AG |
1924 | .fault = tcmu_vma_fault, |
1925 | }; | |
1926 | ||
1927 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1928 | { | |
1929 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1930 | ||
1c71222e | 1931 | vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); |
7c9e7a6f AG |
1932 | vma->vm_ops = &tcmu_vm_ops; |
1933 | ||
1934 | vma->vm_private_data = udev; | |
1935 | ||
1936 | /* Ensure the mmap is exactly the right size */ | |
ecddbb7e | 1937 | if (vma_pages(vma) != udev->mmap_pages) |
7c9e7a6f AG |
1938 | return -EINVAL; |
1939 | ||
8f33bb24 BS |
1940 | tcmu_vma_open(vma); |
1941 | ||
7c9e7a6f AG |
1942 | return 0; |
1943 | } | |
1944 | ||
1945 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1946 | { | |
1947 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1948 | ||
1949 | /* O_EXCL not supported for char devs, so fake it? */ | |
1950 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1951 | return -EBUSY; | |
1952 | ||
b6df4b79 XL |
1953 | udev->inode = inode; |
1954 | ||
7c9e7a6f AG |
1955 | pr_debug("open\n"); |
1956 | ||
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | static int tcmu_release(struct uio_info *info, struct inode *inode) | |
1961 | { | |
1962 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
018c1491 BS |
1963 | struct tcmu_cmd *cmd; |
1964 | unsigned long i; | |
1965 | bool freed = false; | |
1966 | ||
1967 | mutex_lock(&udev->cmdr_lock); | |
1968 | ||
1969 | xa_for_each(&udev->commands, i, cmd) { | |
1970 | /* Cmds with KEEP_BUF set are no longer on the ring, but | |
1971 | * userspace still holds the data buffer. If userspace closes | |
1972 | * we implicitly free these cmds and buffers, since after new | |
1973 | * open the (new ?) userspace cannot find the cmd in the ring | |
1974 | * and thus never will release the buffer by writing cmd_id to | |
1975 | * free_kept_buf action attribute. | |
1976 | */ | |
1977 | if (!test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags)) | |
1978 | continue; | |
1979 | pr_debug("removing KEEP_BUF cmd %u on dev %s from ring\n", | |
1980 | cmd->cmd_id, udev->name); | |
1981 | freed = true; | |
1982 | ||
1983 | xa_erase(&udev->commands, i); | |
1984 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); | |
1985 | tcmu_free_cmd(cmd); | |
1986 | } | |
1987 | /* | |
1988 | * We only freed data space, not ring space. Therefore we dont call | |
1989 | * run_tmr_queue, but call run_qfull_queue if tmr_list is empty. | |
1990 | */ | |
1991 | if (freed && list_empty(&udev->tmr_queue)) | |
1992 | run_qfull_queue(udev, false); | |
1993 | ||
1994 | mutex_unlock(&udev->cmdr_lock); | |
7c9e7a6f AG |
1995 | |
1996 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1997 | ||
1998 | pr_debug("close\n"); | |
8f33bb24 | 1999 | |
7c9e7a6f AG |
2000 | return 0; |
2001 | } | |
2002 | ||
9de3a1ef | 2003 | static int tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
b3af66e2 MC |
2004 | { |
2005 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
2006 | ||
2007 | if (!tcmu_kern_cmd_reply_supported) | |
9de3a1ef | 2008 | return 0; |
b849b456 KN |
2009 | |
2010 | if (udev->nl_reply_supported <= 0) | |
9de3a1ef | 2011 | return 0; |
b849b456 | 2012 | |
3228691f | 2013 | mutex_lock(&tcmu_nl_cmd_mutex); |
b849b456 | 2014 | |
bdaeedc1 MC |
2015 | if (tcmu_netlink_blocked) { |
2016 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
2017 | pr_warn("Failing nl cmd %d on %s. Interface is blocked.\n", cmd, | |
2018 | udev->name); | |
2019 | return -EAGAIN; | |
2020 | } | |
b3af66e2 MC |
2021 | |
2022 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
3228691f | 2023 | mutex_unlock(&tcmu_nl_cmd_mutex); |
9de3a1ef MC |
2024 | pr_warn("netlink cmd %d already executing on %s\n", |
2025 | nl_cmd->cmd, udev->name); | |
2026 | return -EBUSY; | |
b3af66e2 MC |
2027 | } |
2028 | ||
2029 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
2030 | nl_cmd->cmd = cmd; | |
3228691f | 2031 | nl_cmd->udev = udev; |
b3af66e2 | 2032 | init_completion(&nl_cmd->complete); |
3228691f MC |
2033 | INIT_LIST_HEAD(&nl_cmd->nl_list); |
2034 | ||
2035 | list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list); | |
b3af66e2 | 2036 | |
3228691f | 2037 | mutex_unlock(&tcmu_nl_cmd_mutex); |
9de3a1ef | 2038 | return 0; |
b3af66e2 MC |
2039 | } |
2040 | ||
7d894862 LZ |
2041 | static void tcmu_destroy_genl_cmd_reply(struct tcmu_dev *udev) |
2042 | { | |
2043 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
2044 | ||
2045 | if (!tcmu_kern_cmd_reply_supported) | |
2046 | return; | |
2047 | ||
2048 | if (udev->nl_reply_supported <= 0) | |
2049 | return; | |
2050 | ||
2051 | mutex_lock(&tcmu_nl_cmd_mutex); | |
2052 | ||
2053 | list_del(&nl_cmd->nl_list); | |
2054 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
2055 | ||
2056 | mutex_unlock(&tcmu_nl_cmd_mutex); | |
2057 | } | |
2058 | ||
b3af66e2 MC |
2059 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) |
2060 | { | |
2061 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
2062 | int ret; | |
b3af66e2 MC |
2063 | |
2064 | if (!tcmu_kern_cmd_reply_supported) | |
2065 | return 0; | |
2066 | ||
b849b456 KN |
2067 | if (udev->nl_reply_supported <= 0) |
2068 | return 0; | |
2069 | ||
b3af66e2 MC |
2070 | pr_debug("sleeping for nl reply\n"); |
2071 | wait_for_completion(&nl_cmd->complete); | |
2072 | ||
3228691f | 2073 | mutex_lock(&tcmu_nl_cmd_mutex); |
b3af66e2 MC |
2074 | nl_cmd->cmd = TCMU_CMD_UNSPEC; |
2075 | ret = nl_cmd->status; | |
3228691f | 2076 | mutex_unlock(&tcmu_nl_cmd_mutex); |
b3af66e2 | 2077 | |
85fae482 | 2078 | return ret; |
b3af66e2 MC |
2079 | } |
2080 | ||
0e5aee39 ZL |
2081 | static int tcmu_netlink_event_init(struct tcmu_dev *udev, |
2082 | enum tcmu_genl_cmd cmd, | |
2083 | struct sk_buff **buf, void **hdr) | |
7c9e7a6f AG |
2084 | { |
2085 | struct sk_buff *skb; | |
2086 | void *msg_header; | |
6e14eab9 | 2087 | int ret = -ENOMEM; |
7c9e7a6f AG |
2088 | |
2089 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2090 | if (!skb) | |
6e14eab9 | 2091 | return ret; |
7c9e7a6f AG |
2092 | |
2093 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
2094 | if (!msg_header) |
2095 | goto free_skb; | |
7c9e7a6f | 2096 | |
b3af66e2 | 2097 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
2098 | if (ret < 0) |
2099 | goto free_skb; | |
7c9e7a6f | 2100 | |
b3af66e2 MC |
2101 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
2102 | if (ret < 0) | |
2103 | goto free_skb; | |
2104 | ||
2105 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
2106 | if (ret < 0) |
2107 | goto free_skb; | |
7c9e7a6f | 2108 | |
0e5aee39 ZL |
2109 | *buf = skb; |
2110 | *hdr = msg_header; | |
2111 | return ret; | |
2d76443e | 2112 | |
0e5aee39 ZL |
2113 | free_skb: |
2114 | nlmsg_free(skb); | |
2115 | return ret; | |
2116 | } | |
2117 | ||
2118 | static int tcmu_netlink_event_send(struct tcmu_dev *udev, | |
2119 | enum tcmu_genl_cmd cmd, | |
06add777 | 2120 | struct sk_buff *skb, void *msg_header) |
0e5aee39 | 2121 | { |
06add777 | 2122 | int ret; |
8a45885c | 2123 | |
053c095a | 2124 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 2125 | |
9de3a1ef MC |
2126 | ret = tcmu_init_genl_cmd_reply(udev, cmd); |
2127 | if (ret) { | |
2128 | nlmsg_free(skb); | |
2129 | return ret; | |
2130 | } | |
b3af66e2 | 2131 | |
20c08b36 | 2132 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
0e5aee39 | 2133 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
2ff717cd CA |
2134 | |
2135 | /* Wait during an add as the listener may not be up yet */ | |
2136 | if (ret == 0 || | |
2137 | (ret == -ESRCH && cmd == TCMU_CMD_ADDED_DEVICE)) | |
2138 | return tcmu_wait_genl_cmd_reply(udev); | |
7d894862 LZ |
2139 | else |
2140 | tcmu_destroy_genl_cmd_reply(udev); | |
2ff717cd | 2141 | |
6e14eab9 | 2142 | return ret; |
7c9e7a6f AG |
2143 | } |
2144 | ||
e0c240ac ZL |
2145 | static int tcmu_send_dev_add_event(struct tcmu_dev *udev) |
2146 | { | |
2147 | struct sk_buff *skb = NULL; | |
2148 | void *msg_header = NULL; | |
2149 | int ret = 0; | |
2150 | ||
2151 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_ADDED_DEVICE, &skb, | |
2152 | &msg_header); | |
2153 | if (ret < 0) | |
2154 | return ret; | |
06add777 MC |
2155 | return tcmu_netlink_event_send(udev, TCMU_CMD_ADDED_DEVICE, skb, |
2156 | msg_header); | |
e0c240ac ZL |
2157 | } |
2158 | ||
f892bd8e ZL |
2159 | static int tcmu_send_dev_remove_event(struct tcmu_dev *udev) |
2160 | { | |
2161 | struct sk_buff *skb = NULL; | |
2162 | void *msg_header = NULL; | |
2163 | int ret = 0; | |
2164 | ||
2165 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_REMOVED_DEVICE, | |
2166 | &skb, &msg_header); | |
2167 | if (ret < 0) | |
2168 | return ret; | |
2169 | return tcmu_netlink_event_send(udev, TCMU_CMD_REMOVED_DEVICE, | |
06add777 | 2170 | skb, msg_header); |
f892bd8e ZL |
2171 | } |
2172 | ||
de8c5221 | 2173 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 2174 | { |
7c9e7a6f AG |
2175 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
2176 | struct uio_info *info; | |
7c9e7a6f AG |
2177 | char *str; |
2178 | ||
2179 | info = &udev->uio_info; | |
7c9e7a6f | 2180 | |
7c9e7a6f | 2181 | if (udev->dev_config[0]) |
22c2f35f CJ |
2182 | str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s/%s", hba->host_id, |
2183 | udev->name, udev->dev_config); | |
2184 | else | |
2185 | str = kasprintf(GFP_KERNEL, "tcm-user/%u/%s", hba->host_id, | |
2186 | udev->name); | |
2187 | if (!str) | |
2188 | return -ENOMEM; | |
7c9e7a6f | 2189 | |
ededd039 BL |
2190 | /* If the old string exists, free it */ |
2191 | kfree(info->name); | |
7c9e7a6f AG |
2192 | info->name = str; |
2193 | ||
de8c5221 BL |
2194 | return 0; |
2195 | } | |
2196 | ||
2197 | static int tcmu_configure_device(struct se_device *dev) | |
2198 | { | |
2199 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2200 | struct uio_info *info; | |
2201 | struct tcmu_mailbox *mb; | |
f5ce815f | 2202 | size_t data_size; |
de8c5221 BL |
2203 | int ret = 0; |
2204 | ||
2205 | ret = tcmu_update_uio_info(udev); | |
2206 | if (ret) | |
2207 | return ret; | |
2208 | ||
2209 | info = &udev->uio_info; | |
2210 | ||
c97840c8 | 2211 | mutex_lock(&udev->cmdr_lock); |
98effe47 | 2212 | udev->data_bitmap = bitmap_zalloc(udev->max_blocks, GFP_KERNEL); |
c97840c8 | 2213 | mutex_unlock(&udev->cmdr_lock); |
a24e7917 WY |
2214 | if (!udev->data_bitmap) { |
2215 | ret = -ENOMEM; | |
80eb8761 | 2216 | goto err_bitmap_alloc; |
a24e7917 | 2217 | } |
80eb8761 | 2218 | |
c7ede4f0 | 2219 | mb = vzalloc(udev->cmdr_size + CMDR_OFF); |
ecddbb7e | 2220 | if (!mb) { |
7c9e7a6f AG |
2221 | ret = -ENOMEM; |
2222 | goto err_vzalloc; | |
2223 | } | |
2224 | ||
2225 | /* mailbox fits in first part of CMDR space */ | |
ecddbb7e BS |
2226 | udev->mb_addr = mb; |
2227 | udev->cmdr = (void *)mb + CMDR_OFF; | |
c7ede4f0 | 2228 | udev->data_off = udev->cmdr_size + CMDR_OFF; |
f5ce815f | 2229 | data_size = TCMU_MBS_TO_PAGES(udev->data_area_mb) << PAGE_SHIFT; |
c7ede4f0 | 2230 | udev->mmap_pages = (data_size + udev->cmdr_size + CMDR_OFF) >> PAGE_SHIFT; |
e719afdc | 2231 | udev->data_blk_size = udev->data_pages_per_blk * PAGE_SIZE; |
b6df4b79 | 2232 | udev->dbi_thresh = 0; /* Default in Idle state */ |
7c9e7a6f | 2233 | |
141685a3 | 2234 | /* Initialise the mailbox of the ring buffer */ |
0ad46af8 | 2235 | mb->version = TCMU_MAILBOX_VERSION; |
bc2d214a BS |
2236 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC | |
2237 | TCMU_MAILBOX_FLAG_CAP_READ_LEN | | |
018c1491 BS |
2238 | TCMU_MAILBOX_FLAG_CAP_TMR | |
2239 | TCMU_MAILBOX_FLAG_CAP_KEEP_BUF; | |
7c9e7a6f AG |
2240 | mb->cmdr_off = CMDR_OFF; |
2241 | mb->cmdr_size = udev->cmdr_size; | |
2242 | ||
2243 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
f5ce815f | 2244 | WARN_ON(data_size % PAGE_SIZE); |
7c9e7a6f | 2245 | |
ac64a2ce | 2246 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
2247 | |
2248 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 2249 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
c7ede4f0 | 2250 | info->mem[0].size = data_size + udev->cmdr_size + CMDR_OFF; |
141685a3 | 2251 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
2252 | |
2253 | info->irqcontrol = tcmu_irqcontrol; | |
2254 | info->irq = UIO_IRQ_CUSTOM; | |
2255 | ||
2256 | info->mmap = tcmu_mmap; | |
2257 | info->open = tcmu_open; | |
2258 | info->release = tcmu_release; | |
2259 | ||
2260 | ret = uio_register_device(tcmu_root_device, info); | |
2261 | if (ret) | |
2262 | goto err_register; | |
2263 | ||
81ee28de SY |
2264 | /* User can set hw_block_size before enable the device */ |
2265 | if (dev->dev_attrib.hw_block_size == 0) | |
2266 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 2267 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
2268 | if (!dev->dev_attrib.hw_max_sectors) |
2269 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
2270 | if (!dev->dev_attrib.emulate_write_cache) |
2271 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
2272 | dev->dev_attrib.hw_queue_depth = 128; |
2273 | ||
b849b456 KN |
2274 | /* If user didn't explicitly disable netlink reply support, use |
2275 | * module scope setting. | |
2276 | */ | |
2277 | if (udev->nl_reply_supported >= 0) | |
2278 | udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; | |
2279 | ||
f3cdbe39 MC |
2280 | /* |
2281 | * Get a ref incase userspace does a close on the uio device before | |
2282 | * LIO has initiated tcmu_free_device. | |
2283 | */ | |
2284 | kref_get(&udev->kref); | |
2285 | ||
e0c240ac | 2286 | ret = tcmu_send_dev_add_event(udev); |
7c9e7a6f AG |
2287 | if (ret) |
2288 | goto err_netlink; | |
2289 | ||
b6df4b79 XL |
2290 | mutex_lock(&root_udev_mutex); |
2291 | list_add(&udev->node, &root_udev); | |
2292 | mutex_unlock(&root_udev_mutex); | |
2293 | ||
7c9e7a6f AG |
2294 | return 0; |
2295 | ||
2296 | err_netlink: | |
f3cdbe39 | 2297 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
2298 | uio_unregister_device(&udev->uio_info); |
2299 | err_register: | |
2300 | vfree(udev->mb_addr); | |
c22adc0b | 2301 | udev->mb_addr = NULL; |
7c9e7a6f | 2302 | err_vzalloc: |
98effe47 | 2303 | bitmap_free(udev->data_bitmap); |
80eb8761 MC |
2304 | udev->data_bitmap = NULL; |
2305 | err_bitmap_alloc: | |
7c9e7a6f | 2306 | kfree(info->name); |
f3cdbe39 | 2307 | info->name = NULL; |
7c9e7a6f AG |
2308 | |
2309 | return ret; | |
2310 | } | |
2311 | ||
7c9e7a6f | 2312 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
2313 | { |
2314 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2315 | ||
2316 | /* release ref from init */ | |
2317 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
2318 | } | |
2319 | ||
2320 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
2321 | { |
2322 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
7c9e7a6f | 2323 | |
9103575a MC |
2324 | del_timer_sync(&udev->cmd_timer); |
2325 | del_timer_sync(&udev->qfull_timer); | |
7c9e7a6f | 2326 | |
b6df4b79 XL |
2327 | mutex_lock(&root_udev_mutex); |
2328 | list_del(&udev->node); | |
2329 | mutex_unlock(&root_udev_mutex); | |
2330 | ||
f892bd8e | 2331 | tcmu_send_dev_remove_event(udev); |
7c9e7a6f | 2332 | |
531283ff | 2333 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
2334 | |
2335 | /* release ref from configure */ | |
2336 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
2337 | } |
2338 | ||
892782ca MC |
2339 | static void tcmu_unblock_dev(struct tcmu_dev *udev) |
2340 | { | |
2341 | mutex_lock(&udev->cmdr_lock); | |
2342 | clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags); | |
2343 | mutex_unlock(&udev->cmdr_lock); | |
2344 | } | |
2345 | ||
2346 | static void tcmu_block_dev(struct tcmu_dev *udev) | |
2347 | { | |
2348 | mutex_lock(&udev->cmdr_lock); | |
2349 | ||
2350 | if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) | |
2351 | goto unlock; | |
2352 | ||
2353 | /* complete IO that has executed successfully */ | |
2354 | tcmu_handle_completions(udev); | |
2355 | /* fail IO waiting to be queued */ | |
a94a2572 | 2356 | run_qfull_queue(udev, true); |
892782ca MC |
2357 | |
2358 | unlock: | |
2359 | mutex_unlock(&udev->cmdr_lock); | |
2360 | } | |
2361 | ||
2362 | static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level) | |
2363 | { | |
2364 | struct tcmu_mailbox *mb; | |
2365 | struct tcmu_cmd *cmd; | |
d3cbb743 | 2366 | unsigned long i; |
892782ca MC |
2367 | |
2368 | mutex_lock(&udev->cmdr_lock); | |
2369 | ||
d3cbb743 | 2370 | xa_for_each(&udev->commands, i, cmd) { |
018c1491 BS |
2371 | pr_debug("removing cmd %u on dev %s from ring %s\n", |
2372 | cmd->cmd_id, udev->name, | |
2373 | test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags) ? | |
2374 | "(is expired)" : | |
2375 | (test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags) ? | |
2376 | "(is keep buffer)" : "")); | |
892782ca | 2377 | |
d3cbb743 | 2378 | xa_erase(&udev->commands, i); |
018c1491 BS |
2379 | if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags) && |
2380 | !test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags)) { | |
a86a7586 | 2381 | WARN_ON(!cmd->se_cmd); |
a94a2572 | 2382 | list_del_init(&cmd->queue_entry); |
780e1384 | 2383 | cmd->se_cmd->priv = NULL; |
892782ca MC |
2384 | if (err_level == 1) { |
2385 | /* | |
2386 | * Userspace was not able to start the | |
2387 | * command or it is retryable. | |
2388 | */ | |
2389 | target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY); | |
2390 | } else { | |
2391 | /* hard failure */ | |
2392 | target_complete_cmd(cmd->se_cmd, | |
2393 | SAM_STAT_CHECK_CONDITION); | |
2394 | } | |
2395 | } | |
2396 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); | |
2397 | tcmu_free_cmd(cmd); | |
2398 | } | |
2399 | ||
2400 | mb = udev->mb_addr; | |
2401 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
2402 | pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned, | |
2403 | mb->cmd_tail, mb->cmd_head); | |
2404 | ||
2405 | udev->cmdr_last_cleaned = 0; | |
2406 | mb->cmd_tail = 0; | |
2407 | mb->cmd_head = 0; | |
2408 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
066f79a5 | 2409 | clear_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); |
892782ca MC |
2410 | |
2411 | del_timer(&udev->cmd_timer); | |
2412 | ||
bc2d214a BS |
2413 | /* |
2414 | * ring is empty and qfull queue never contains aborted commands. | |
2415 | * So TMRs in tmr queue do not contain relevant cmd_ids. | |
2416 | * After a ring reset userspace should do a fresh start, so | |
2417 | * even LUN RESET message is no longer relevant. | |
2418 | * Therefore remove all TMRs from qfull queue | |
2419 | */ | |
2420 | tcmu_remove_all_queued_tmr(udev); | |
2421 | ||
61fb2482 BS |
2422 | run_qfull_queue(udev, false); |
2423 | ||
892782ca MC |
2424 | mutex_unlock(&udev->cmdr_lock); |
2425 | } | |
2426 | ||
7c9e7a6f | 2427 | enum { |
3abaa2bf | 2428 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
08976cb5 | 2429 | Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_data_pages_per_blk, |
c7ede4f0 | 2430 | Opt_cmd_ring_size_mb, Opt_err, |
7c9e7a6f AG |
2431 | }; |
2432 | ||
2433 | static match_table_t tokens = { | |
2434 | {Opt_dev_config, "dev_config=%s"}, | |
0e0d7526 | 2435 | {Opt_dev_size, "dev_size=%s"}, |
b60cb1f8 MC |
2436 | {Opt_hw_block_size, "hw_block_size=%d"}, |
2437 | {Opt_hw_max_sectors, "hw_max_sectors=%d"}, | |
b849b456 | 2438 | {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
c97840c8 | 2439 | {Opt_max_data_area_mb, "max_data_area_mb=%d"}, |
08976cb5 | 2440 | {Opt_data_pages_per_blk, "data_pages_per_blk=%d"}, |
c7ede4f0 | 2441 | {Opt_cmd_ring_size_mb, "cmd_ring_size_mb=%d"}, |
7c9e7a6f AG |
2442 | {Opt_err, NULL} |
2443 | }; | |
2444 | ||
3abaa2bf MC |
2445 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
2446 | { | |
b60cb1f8 | 2447 | int val, ret; |
3abaa2bf | 2448 | |
b60cb1f8 | 2449 | ret = match_int(arg, &val); |
3abaa2bf | 2450 | if (ret < 0) { |
b60cb1f8 MC |
2451 | pr_err("match_int() failed for dev attrib. Error %d.\n", |
2452 | ret); | |
3abaa2bf MC |
2453 | return ret; |
2454 | } | |
b60cb1f8 MC |
2455 | |
2456 | if (val <= 0) { | |
2457 | pr_err("Invalid dev attrib value %d. Must be greater than zero.\n", | |
2458 | val); | |
3abaa2bf MC |
2459 | return -EINVAL; |
2460 | } | |
b60cb1f8 | 2461 | *dev_attrib = val; |
3abaa2bf MC |
2462 | return 0; |
2463 | } | |
2464 | ||
c97840c8 MC |
2465 | static int tcmu_set_max_blocks_param(struct tcmu_dev *udev, substring_t *arg) |
2466 | { | |
f5ce815f | 2467 | int val, ret; |
e719afdc | 2468 | uint32_t pages_per_blk = udev->data_pages_per_blk; |
c97840c8 MC |
2469 | |
2470 | ret = match_int(arg, &val); | |
2471 | if (ret < 0) { | |
2472 | pr_err("match_int() failed for max_data_area_mb=. Error %d.\n", | |
2473 | ret); | |
2474 | return ret; | |
2475 | } | |
f5ce815f | 2476 | if (val <= 0) { |
c97840c8 MC |
2477 | pr_err("Invalid max_data_area %d.\n", val); |
2478 | return -EINVAL; | |
2479 | } | |
f5ce815f BS |
2480 | if (val > TCMU_PAGES_TO_MBS(tcmu_global_max_pages)) { |
2481 | pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n", | |
2482 | val, TCMU_PAGES_TO_MBS(tcmu_global_max_pages)); | |
2483 | val = TCMU_PAGES_TO_MBS(tcmu_global_max_pages); | |
2484 | } | |
e719afdc BS |
2485 | if (TCMU_MBS_TO_PAGES(val) < pages_per_blk) { |
2486 | pr_err("Invalid max_data_area %d (%zu pages): smaller than data_pages_per_blk (%u pages).\n", | |
2487 | val, TCMU_MBS_TO_PAGES(val), pages_per_blk); | |
f5ce815f BS |
2488 | return -EINVAL; |
2489 | } | |
c97840c8 MC |
2490 | |
2491 | mutex_lock(&udev->cmdr_lock); | |
2492 | if (udev->data_bitmap) { | |
2493 | pr_err("Cannot set max_data_area_mb after it has been enabled.\n"); | |
2494 | ret = -EINVAL; | |
2495 | goto unlock; | |
2496 | } | |
2497 | ||
f5ce815f | 2498 | udev->data_area_mb = val; |
e719afdc | 2499 | udev->max_blocks = TCMU_MBS_TO_PAGES(val) / pages_per_blk; |
c97840c8 MC |
2500 | |
2501 | unlock: | |
2502 | mutex_unlock(&udev->cmdr_lock); | |
2503 | return ret; | |
2504 | } | |
2505 | ||
08976cb5 BS |
2506 | static int tcmu_set_data_pages_per_blk(struct tcmu_dev *udev, substring_t *arg) |
2507 | { | |
2508 | int val, ret; | |
2509 | ||
2510 | ret = match_int(arg, &val); | |
2511 | if (ret < 0) { | |
2512 | pr_err("match_int() failed for data_pages_per_blk=. Error %d.\n", | |
2513 | ret); | |
2514 | return ret; | |
2515 | } | |
2516 | ||
2517 | if (val > TCMU_MBS_TO_PAGES(udev->data_area_mb)) { | |
2518 | pr_err("Invalid data_pages_per_blk %d: greater than max_data_area_mb %d -> %zd pages).\n", | |
2519 | val, udev->data_area_mb, | |
2520 | TCMU_MBS_TO_PAGES(udev->data_area_mb)); | |
2521 | return -EINVAL; | |
2522 | } | |
2523 | ||
2524 | mutex_lock(&udev->cmdr_lock); | |
2525 | if (udev->data_bitmap) { | |
2526 | pr_err("Cannot set data_pages_per_blk after it has been enabled.\n"); | |
2527 | ret = -EINVAL; | |
2528 | goto unlock; | |
2529 | } | |
2530 | ||
2531 | udev->data_pages_per_blk = val; | |
2532 | udev->max_blocks = TCMU_MBS_TO_PAGES(udev->data_area_mb) / val; | |
2533 | ||
2534 | unlock: | |
2535 | mutex_unlock(&udev->cmdr_lock); | |
2536 | return ret; | |
2537 | } | |
2538 | ||
c7ede4f0 GL |
2539 | static int tcmu_set_cmd_ring_size(struct tcmu_dev *udev, substring_t *arg) |
2540 | { | |
2541 | int val, ret; | |
2542 | ||
2543 | ret = match_int(arg, &val); | |
2544 | if (ret < 0) { | |
2545 | pr_err("match_int() failed for cmd_ring_size_mb=. Error %d.\n", | |
2546 | ret); | |
2547 | return ret; | |
2548 | } | |
2549 | ||
2550 | if (val <= 0) { | |
2551 | pr_err("Invalid cmd_ring_size_mb %d.\n", val); | |
2552 | return -EINVAL; | |
2553 | } | |
2554 | ||
2555 | mutex_lock(&udev->cmdr_lock); | |
2556 | if (udev->data_bitmap) { | |
2557 | pr_err("Cannot set cmd_ring_size_mb after it has been enabled.\n"); | |
2558 | ret = -EINVAL; | |
2559 | goto unlock; | |
2560 | } | |
2561 | ||
2562 | udev->cmdr_size = (val << 20) - CMDR_OFF; | |
2563 | if (val > (MB_CMDR_SIZE_DEF >> 20)) { | |
2564 | pr_err("%d is too large. Adjusting cmd_ring_size_mb to global limit of %u\n", | |
2565 | val, (MB_CMDR_SIZE_DEF >> 20)); | |
2566 | udev->cmdr_size = CMDR_SIZE_DEF; | |
2567 | } | |
2568 | ||
2569 | unlock: | |
2570 | mutex_unlock(&udev->cmdr_lock); | |
2571 | return ret; | |
2572 | } | |
2573 | ||
7c9e7a6f AG |
2574 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
2575 | const char *page, ssize_t count) | |
2576 | { | |
2577 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
0e0d7526 | 2578 | char *orig, *ptr, *opts; |
7c9e7a6f | 2579 | substring_t args[MAX_OPT_ARGS]; |
c97840c8 | 2580 | int ret = 0, token; |
7c9e7a6f AG |
2581 | |
2582 | opts = kstrdup(page, GFP_KERNEL); | |
2583 | if (!opts) | |
2584 | return -ENOMEM; | |
2585 | ||
2586 | orig = opts; | |
2587 | ||
2588 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
2589 | if (!*ptr) | |
2590 | continue; | |
2591 | ||
2592 | token = match_token(ptr, tokens, args); | |
2593 | switch (token) { | |
2594 | case Opt_dev_config: | |
2595 | if (match_strlcpy(udev->dev_config, &args[0], | |
2596 | TCMU_CONFIG_LEN) == 0) { | |
2597 | ret = -EINVAL; | |
2598 | break; | |
2599 | } | |
2600 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
2601 | break; | |
2602 | case Opt_dev_size: | |
0e0d7526 | 2603 | ret = match_u64(&args[0], &udev->dev_size); |
7c9e7a6f | 2604 | if (ret < 0) |
0e0d7526 MC |
2605 | pr_err("match_u64() failed for dev_size=. Error %d.\n", |
2606 | ret); | |
7c9e7a6f | 2607 | break; |
9c1cd1b6 | 2608 | case Opt_hw_block_size: |
3abaa2bf MC |
2609 | ret = tcmu_set_dev_attrib(&args[0], |
2610 | &(dev->dev_attrib.hw_block_size)); | |
2611 | break; | |
2612 | case Opt_hw_max_sectors: | |
2613 | ret = tcmu_set_dev_attrib(&args[0], | |
2614 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 2615 | break; |
b849b456 | 2616 | case Opt_nl_reply_supported: |
b60cb1f8 | 2617 | ret = match_int(&args[0], &udev->nl_reply_supported); |
b849b456 | 2618 | if (ret < 0) |
b60cb1f8 MC |
2619 | pr_err("match_int() failed for nl_reply_supported=. Error %d.\n", |
2620 | ret); | |
b849b456 | 2621 | break; |
80eb8761 | 2622 | case Opt_max_data_area_mb: |
c97840c8 | 2623 | ret = tcmu_set_max_blocks_param(udev, &args[0]); |
80eb8761 | 2624 | break; |
08976cb5 BS |
2625 | case Opt_data_pages_per_blk: |
2626 | ret = tcmu_set_data_pages_per_blk(udev, &args[0]); | |
2627 | break; | |
c7ede4f0 GL |
2628 | case Opt_cmd_ring_size_mb: |
2629 | ret = tcmu_set_cmd_ring_size(udev, &args[0]); | |
2630 | break; | |
7c9e7a6f AG |
2631 | default: |
2632 | break; | |
2633 | } | |
2579325c MC |
2634 | |
2635 | if (ret) | |
2636 | break; | |
7c9e7a6f AG |
2637 | } |
2638 | ||
2639 | kfree(orig); | |
2640 | return (!ret) ? count : ret; | |
2641 | } | |
2642 | ||
2643 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
2644 | { | |
2645 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2646 | ssize_t bl = 0; | |
2647 | ||
2648 | bl = sprintf(b + bl, "Config: %s ", | |
2649 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
0e0d7526 | 2650 | bl += sprintf(b + bl, "Size: %llu ", udev->dev_size); |
08976cb5 | 2651 | bl += sprintf(b + bl, "MaxDataAreaMB: %u ", udev->data_area_mb); |
c7ede4f0 GL |
2652 | bl += sprintf(b + bl, "DataPagesPerBlk: %u ", udev->data_pages_per_blk); |
2653 | bl += sprintf(b + bl, "CmdRingSizeMB: %u\n", | |
2654 | (udev->cmdr_size + CMDR_OFF) >> 20); | |
7c9e7a6f AG |
2655 | |
2656 | return bl; | |
2657 | } | |
2658 | ||
2659 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
2660 | { | |
2661 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
2662 | ||
2663 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
2664 | dev->dev_attrib.block_size); | |
2665 | } | |
2666 | ||
7c9e7a6f | 2667 | static sense_reason_t |
9c1cd1b6 | 2668 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 2669 | { |
02eb924f | 2670 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
2671 | } |
2672 | ||
7d7a7435 NB |
2673 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
2674 | { | |
2675 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2676 | struct se_dev_attrib, da_group); | |
b5ab697c | 2677 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
7d7a7435 NB |
2678 | |
2679 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
2680 | } | |
2681 | ||
2682 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
2683 | size_t count) | |
2684 | { | |
2685 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2686 | struct se_dev_attrib, da_group); | |
2687 | struct tcmu_dev *udev = container_of(da->da_dev, | |
2688 | struct tcmu_dev, se_dev); | |
2689 | u32 val; | |
2690 | int ret; | |
2691 | ||
2692 | if (da->da_dev->export_count) { | |
2693 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
2694 | return -EINVAL; | |
2695 | } | |
2696 | ||
2697 | ret = kstrtou32(page, 0, &val); | |
2698 | if (ret < 0) | |
2699 | return ret; | |
2700 | ||
7d7a7435 NB |
2701 | udev->cmd_time_out = val * MSEC_PER_SEC; |
2702 | return count; | |
2703 | } | |
2704 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
2705 | ||
9103575a MC |
2706 | static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page) |
2707 | { | |
2708 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2709 | struct se_dev_attrib, da_group); | |
2710 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2711 | ||
2712 | return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ? | |
2713 | udev->qfull_time_out : | |
2714 | udev->qfull_time_out / MSEC_PER_SEC); | |
2715 | } | |
2716 | ||
2717 | static ssize_t tcmu_qfull_time_out_store(struct config_item *item, | |
2718 | const char *page, size_t count) | |
2719 | { | |
2720 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2721 | struct se_dev_attrib, da_group); | |
2722 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2723 | s32 val; | |
2724 | int ret; | |
2725 | ||
2726 | ret = kstrtos32(page, 0, &val); | |
2727 | if (ret < 0) | |
2728 | return ret; | |
2729 | ||
2730 | if (val >= 0) { | |
2731 | udev->qfull_time_out = val * MSEC_PER_SEC; | |
125966db PKK |
2732 | } else if (val == -1) { |
2733 | udev->qfull_time_out = val; | |
9103575a MC |
2734 | } else { |
2735 | printk(KERN_ERR "Invalid qfull timeout value %d\n", val); | |
2736 | return -EINVAL; | |
2737 | } | |
2738 | return count; | |
2739 | } | |
2740 | CONFIGFS_ATTR(tcmu_, qfull_time_out); | |
2741 | ||
80eb8761 MC |
2742 | static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page) |
2743 | { | |
2744 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2745 | struct se_dev_attrib, da_group); | |
2746 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2747 | ||
f5ce815f | 2748 | return snprintf(page, PAGE_SIZE, "%u\n", udev->data_area_mb); |
80eb8761 MC |
2749 | } |
2750 | CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb); | |
2751 | ||
08976cb5 BS |
2752 | static ssize_t tcmu_data_pages_per_blk_show(struct config_item *item, |
2753 | char *page) | |
2754 | { | |
2755 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2756 | struct se_dev_attrib, da_group); | |
2757 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2758 | ||
2759 | return snprintf(page, PAGE_SIZE, "%u\n", udev->data_pages_per_blk); | |
2760 | } | |
2761 | CONFIGFS_ATTR_RO(tcmu_, data_pages_per_blk); | |
2762 | ||
c7ede4f0 GL |
2763 | static ssize_t tcmu_cmd_ring_size_mb_show(struct config_item *item, char *page) |
2764 | { | |
2765 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2766 | struct se_dev_attrib, da_group); | |
2767 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2768 | ||
2769 | return snprintf(page, PAGE_SIZE, "%u\n", | |
2770 | (udev->cmdr_size + CMDR_OFF) >> 20); | |
2771 | } | |
2772 | CONFIGFS_ATTR_RO(tcmu_, cmd_ring_size_mb); | |
2773 | ||
2d76443e | 2774 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
2775 | { |
2776 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2777 | struct se_dev_attrib, da_group); | |
2778 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2779 | ||
2780 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
2781 | } | |
2782 | ||
02ccfb54 ZL |
2783 | static int tcmu_send_dev_config_event(struct tcmu_dev *udev, |
2784 | const char *reconfig_data) | |
2785 | { | |
2786 | struct sk_buff *skb = NULL; | |
2787 | void *msg_header = NULL; | |
2788 | int ret = 0; | |
2789 | ||
2790 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2791 | &skb, &msg_header); | |
2792 | if (ret < 0) | |
2793 | return ret; | |
2794 | ret = nla_put_string(skb, TCMU_ATTR_DEV_CFG, reconfig_data); | |
2795 | if (ret < 0) { | |
2796 | nlmsg_free(skb); | |
2797 | return ret; | |
2798 | } | |
2799 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2800 | skb, msg_header); |
02ccfb54 ZL |
2801 | } |
2802 | ||
2803 | ||
2d76443e MC |
2804 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
2805 | size_t count) | |
ee018252 BL |
2806 | { |
2807 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2808 | struct se_dev_attrib, da_group); | |
2809 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 2810 | int ret, len; |
ee018252 | 2811 | |
2d76443e MC |
2812 | len = strlen(page); |
2813 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 2814 | return -EINVAL; |
ee018252 BL |
2815 | |
2816 | /* Check if device has been configured before */ | |
63d5be0f | 2817 | if (target_dev_configured(&udev->se_dev)) { |
02ccfb54 | 2818 | ret = tcmu_send_dev_config_event(udev, page); |
ee018252 BL |
2819 | if (ret) { |
2820 | pr_err("Unable to reconfigure device\n"); | |
2821 | return ret; | |
2822 | } | |
de8c5221 BL |
2823 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
2824 | ||
2825 | ret = tcmu_update_uio_info(udev); | |
2826 | if (ret) | |
2827 | return ret; | |
2828 | return count; | |
ee018252 | 2829 | } |
2d76443e | 2830 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
2831 | |
2832 | return count; | |
2833 | } | |
2d76443e | 2834 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 2835 | |
801fc54d BL |
2836 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
2837 | { | |
2838 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2839 | struct se_dev_attrib, da_group); | |
2840 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2841 | ||
0e0d7526 | 2842 | return snprintf(page, PAGE_SIZE, "%llu\n", udev->dev_size); |
801fc54d BL |
2843 | } |
2844 | ||
84e28506 ZL |
2845 | static int tcmu_send_dev_size_event(struct tcmu_dev *udev, u64 size) |
2846 | { | |
2847 | struct sk_buff *skb = NULL; | |
2848 | void *msg_header = NULL; | |
2849 | int ret = 0; | |
2850 | ||
2851 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2852 | &skb, &msg_header); | |
2853 | if (ret < 0) | |
2854 | return ret; | |
2855 | ret = nla_put_u64_64bit(skb, TCMU_ATTR_DEV_SIZE, | |
2856 | size, TCMU_ATTR_PAD); | |
2857 | if (ret < 0) { | |
2858 | nlmsg_free(skb); | |
2859 | return ret; | |
2860 | } | |
2861 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2862 | skb, msg_header); |
84e28506 ZL |
2863 | } |
2864 | ||
801fc54d BL |
2865 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, |
2866 | size_t count) | |
2867 | { | |
2868 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2869 | struct se_dev_attrib, da_group); | |
2870 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 2871 | u64 val; |
801fc54d BL |
2872 | int ret; |
2873 | ||
2d76443e | 2874 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
2875 | if (ret < 0) |
2876 | return ret; | |
801fc54d BL |
2877 | |
2878 | /* Check if device has been configured before */ | |
63d5be0f | 2879 | if (target_dev_configured(&udev->se_dev)) { |
84e28506 | 2880 | ret = tcmu_send_dev_size_event(udev, val); |
801fc54d BL |
2881 | if (ret) { |
2882 | pr_err("Unable to reconfigure device\n"); | |
2883 | return ret; | |
2884 | } | |
2885 | } | |
2d76443e | 2886 | udev->dev_size = val; |
801fc54d BL |
2887 | return count; |
2888 | } | |
2889 | CONFIGFS_ATTR(tcmu_, dev_size); | |
2890 | ||
b849b456 KN |
2891 | static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
2892 | char *page) | |
2893 | { | |
2894 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2895 | struct se_dev_attrib, da_group); | |
2896 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2897 | ||
2898 | return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); | |
2899 | } | |
2900 | ||
2901 | static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, | |
2902 | const char *page, size_t count) | |
2903 | { | |
2904 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2905 | struct se_dev_attrib, da_group); | |
2906 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2907 | s8 val; | |
2908 | int ret; | |
2909 | ||
2910 | ret = kstrtos8(page, 0, &val); | |
2911 | if (ret < 0) | |
2912 | return ret; | |
2913 | ||
2914 | udev->nl_reply_supported = val; | |
2915 | return count; | |
2916 | } | |
2917 | CONFIGFS_ATTR(tcmu_, nl_reply_supported); | |
2918 | ||
9a8bb606 BL |
2919 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
2920 | char *page) | |
2921 | { | |
2922 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2923 | struct se_dev_attrib, da_group); | |
2924 | ||
2925 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
2926 | } | |
2927 | ||
33d065cc ZL |
2928 | static int tcmu_send_emulate_write_cache(struct tcmu_dev *udev, u8 val) |
2929 | { | |
2930 | struct sk_buff *skb = NULL; | |
2931 | void *msg_header = NULL; | |
2932 | int ret = 0; | |
2933 | ||
2934 | ret = tcmu_netlink_event_init(udev, TCMU_CMD_RECONFIG_DEVICE, | |
2935 | &skb, &msg_header); | |
2936 | if (ret < 0) | |
2937 | return ret; | |
2938 | ret = nla_put_u8(skb, TCMU_ATTR_WRITECACHE, val); | |
2939 | if (ret < 0) { | |
2940 | nlmsg_free(skb); | |
2941 | return ret; | |
2942 | } | |
2943 | return tcmu_netlink_event_send(udev, TCMU_CMD_RECONFIG_DEVICE, | |
06add777 | 2944 | skb, msg_header); |
33d065cc ZL |
2945 | } |
2946 | ||
9a8bb606 BL |
2947 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, |
2948 | const char *page, size_t count) | |
2949 | { | |
2950 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2951 | struct se_dev_attrib, da_group); | |
1068be7b | 2952 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 2953 | u8 val; |
9a8bb606 BL |
2954 | int ret; |
2955 | ||
2d76443e | 2956 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
2957 | if (ret < 0) |
2958 | return ret; | |
2959 | ||
1068be7b | 2960 | /* Check if device has been configured before */ |
63d5be0f | 2961 | if (target_dev_configured(&udev->se_dev)) { |
33d065cc | 2962 | ret = tcmu_send_emulate_write_cache(udev, val); |
1068be7b BL |
2963 | if (ret) { |
2964 | pr_err("Unable to reconfigure device\n"); | |
2965 | return ret; | |
2966 | } | |
2967 | } | |
2d76443e MC |
2968 | |
2969 | da->emulate_write_cache = val; | |
9a8bb606 BL |
2970 | return count; |
2971 | } | |
2972 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
2973 | ||
59526d7a BS |
2974 | static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) |
2975 | { | |
2976 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2977 | struct se_dev_attrib, da_group); | |
2978 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2979 | ||
2980 | return snprintf(page, PAGE_SIZE, "%i\n", | |
2981 | test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); | |
2982 | } | |
2983 | ||
2984 | static ssize_t tcmu_tmr_notification_store(struct config_item *item, | |
2985 | const char *page, size_t count) | |
2986 | { | |
2987 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
2988 | struct se_dev_attrib, da_group); | |
2989 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2990 | u8 val; | |
2991 | int ret; | |
2992 | ||
2993 | ret = kstrtou8(page, 0, &val); | |
2994 | if (ret < 0) | |
2995 | return ret; | |
2996 | if (val > 1) | |
2997 | return -EINVAL; | |
2998 | ||
2999 | if (val) | |
3000 | set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); | |
3001 | else | |
3002 | clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); | |
3003 | return count; | |
3004 | } | |
3005 | CONFIGFS_ATTR(tcmu_, tmr_notification); | |
3006 | ||
892782ca MC |
3007 | static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) |
3008 | { | |
3009 | struct se_device *se_dev = container_of(to_config_group(item), | |
3010 | struct se_device, | |
3011 | dev_action_group); | |
3012 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
3013 | ||
3014 | if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) | |
3015 | return snprintf(page, PAGE_SIZE, "%s\n", "blocked"); | |
3016 | else | |
3017 | return snprintf(page, PAGE_SIZE, "%s\n", "unblocked"); | |
3018 | } | |
3019 | ||
3020 | static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page, | |
3021 | size_t count) | |
3022 | { | |
3023 | struct se_device *se_dev = container_of(to_config_group(item), | |
3024 | struct se_device, | |
3025 | dev_action_group); | |
3026 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
3027 | u8 val; | |
3028 | int ret; | |
3029 | ||
a30b0473 MC |
3030 | if (!target_dev_configured(&udev->se_dev)) { |
3031 | pr_err("Device is not configured.\n"); | |
3032 | return -EINVAL; | |
3033 | } | |
3034 | ||
892782ca MC |
3035 | ret = kstrtou8(page, 0, &val); |
3036 | if (ret < 0) | |
3037 | return ret; | |
3038 | ||
3039 | if (val > 1) { | |
3040 | pr_err("Invalid block value %d\n", val); | |
3041 | return -EINVAL; | |
3042 | } | |
3043 | ||
3044 | if (!val) | |
3045 | tcmu_unblock_dev(udev); | |
3046 | else | |
3047 | tcmu_block_dev(udev); | |
3048 | return count; | |
3049 | } | |
3050 | CONFIGFS_ATTR(tcmu_, block_dev); | |
3051 | ||
3052 | static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page, | |
3053 | size_t count) | |
3054 | { | |
3055 | struct se_device *se_dev = container_of(to_config_group(item), | |
3056 | struct se_device, | |
3057 | dev_action_group); | |
3058 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
3059 | u8 val; | |
3060 | int ret; | |
3061 | ||
a30b0473 MC |
3062 | if (!target_dev_configured(&udev->se_dev)) { |
3063 | pr_err("Device is not configured.\n"); | |
3064 | return -EINVAL; | |
3065 | } | |
3066 | ||
892782ca MC |
3067 | ret = kstrtou8(page, 0, &val); |
3068 | if (ret < 0) | |
3069 | return ret; | |
3070 | ||
3071 | if (val != 1 && val != 2) { | |
3072 | pr_err("Invalid reset ring value %d\n", val); | |
3073 | return -EINVAL; | |
3074 | } | |
3075 | ||
3076 | tcmu_reset_ring(udev, val); | |
3077 | return count; | |
3078 | } | |
3079 | CONFIGFS_ATTR_WO(tcmu_, reset_ring); | |
3080 | ||
018c1491 BS |
3081 | static ssize_t tcmu_free_kept_buf_store(struct config_item *item, const char *page, |
3082 | size_t count) | |
3083 | { | |
3084 | struct se_device *se_dev = container_of(to_config_group(item), | |
3085 | struct se_device, | |
3086 | dev_action_group); | |
3087 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
3088 | struct tcmu_cmd *cmd; | |
3089 | u16 cmd_id; | |
3090 | int ret; | |
3091 | ||
3092 | if (!target_dev_configured(&udev->se_dev)) { | |
3093 | pr_err("Device is not configured.\n"); | |
3094 | return -EINVAL; | |
3095 | } | |
3096 | ||
3097 | ret = kstrtou16(page, 0, &cmd_id); | |
3098 | if (ret < 0) | |
3099 | return ret; | |
3100 | ||
3101 | mutex_lock(&udev->cmdr_lock); | |
3102 | ||
3103 | { | |
3104 | XA_STATE(xas, &udev->commands, cmd_id); | |
3105 | ||
3106 | xas_lock(&xas); | |
3107 | cmd = xas_load(&xas); | |
3108 | if (!cmd) { | |
3109 | pr_err("free_kept_buf: cmd_id %d not found\n", cmd_id); | |
3110 | count = -EINVAL; | |
3111 | xas_unlock(&xas); | |
3112 | goto out_unlock; | |
3113 | } | |
3114 | if (!test_bit(TCMU_CMD_BIT_KEEP_BUF, &cmd->flags)) { | |
3115 | pr_err("free_kept_buf: cmd_id %d was not completed with KEEP_BUF\n", | |
3116 | cmd_id); | |
3117 | count = -EINVAL; | |
3118 | xas_unlock(&xas); | |
3119 | goto out_unlock; | |
3120 | } | |
3121 | xas_store(&xas, NULL); | |
3122 | xas_unlock(&xas); | |
3123 | } | |
3124 | ||
3125 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); | |
3126 | tcmu_free_cmd(cmd); | |
3127 | /* | |
3128 | * We only freed data space, not ring space. Therefore we dont call | |
3129 | * run_tmr_queue, but call run_qfull_queue if tmr_list is empty. | |
3130 | */ | |
3131 | if (list_empty(&udev->tmr_queue)) | |
3132 | run_qfull_queue(udev, false); | |
3133 | ||
3134 | out_unlock: | |
3135 | mutex_unlock(&udev->cmdr_lock); | |
3136 | return count; | |
3137 | } | |
3138 | CONFIGFS_ATTR_WO(tcmu_, free_kept_buf); | |
3139 | ||
5821783b | 3140 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 3141 | &tcmu_attr_cmd_time_out, |
9103575a | 3142 | &tcmu_attr_qfull_time_out, |
80eb8761 | 3143 | &tcmu_attr_max_data_area_mb, |
08976cb5 | 3144 | &tcmu_attr_data_pages_per_blk, |
c7ede4f0 | 3145 | &tcmu_attr_cmd_ring_size_mb, |
2d76443e | 3146 | &tcmu_attr_dev_config, |
801fc54d BL |
3147 | &tcmu_attr_dev_size, |
3148 | &tcmu_attr_emulate_write_cache, | |
59526d7a | 3149 | &tcmu_attr_tmr_notification, |
b849b456 | 3150 | &tcmu_attr_nl_reply_supported, |
801fc54d BL |
3151 | NULL, |
3152 | }; | |
3153 | ||
7d7a7435 NB |
3154 | static struct configfs_attribute **tcmu_attrs; |
3155 | ||
892782ca MC |
3156 | static struct configfs_attribute *tcmu_action_attrs[] = { |
3157 | &tcmu_attr_block_dev, | |
3158 | &tcmu_attr_reset_ring, | |
018c1491 | 3159 | &tcmu_attr_free_kept_buf, |
892782ca MC |
3160 | NULL, |
3161 | }; | |
3162 | ||
7d7a7435 | 3163 | static struct target_backend_ops tcmu_ops = { |
7c9e7a6f | 3164 | .name = "user", |
7c9e7a6f | 3165 | .owner = THIS_MODULE, |
69088a04 | 3166 | .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH, |
356ba2a8 BS |
3167 | .transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR | |
3168 | TRANSPORT_FLAG_PASSTHROUGH_ALUA, | |
7c9e7a6f AG |
3169 | .attach_hba = tcmu_attach_hba, |
3170 | .detach_hba = tcmu_detach_hba, | |
3171 | .alloc_device = tcmu_alloc_device, | |
3172 | .configure_device = tcmu_configure_device, | |
92634706 | 3173 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f | 3174 | .free_device = tcmu_free_device, |
6888da81 MC |
3175 | .unplug_device = tcmu_unplug_device, |
3176 | .plug_device = tcmu_plug_device, | |
7c9e7a6f | 3177 | .parse_cdb = tcmu_parse_cdb, |
bc2d214a | 3178 | .tmr_notify = tcmu_tmr_notify, |
7c9e7a6f AG |
3179 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, |
3180 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
3181 | .get_device_type = sbc_get_device_type, | |
3182 | .get_blocks = tcmu_get_blocks, | |
892782ca | 3183 | .tb_dev_action_attrs = tcmu_action_attrs, |
7c9e7a6f AG |
3184 | }; |
3185 | ||
89ec9cfd | 3186 | static void find_free_blocks(void) |
b6df4b79 XL |
3187 | { |
3188 | struct tcmu_dev *udev; | |
3189 | loff_t off; | |
f5ce815f BS |
3190 | u32 pages_freed, total_pages_freed = 0; |
3191 | u32 start, end, block, total_blocks_freed = 0; | |
af1dd7ff | 3192 | |
8b084d9d | 3193 | if (atomic_read(&global_page_count) <= tcmu_global_max_pages) |
af1dd7ff | 3194 | return; |
b6df4b79 | 3195 | |
89ec9cfd MC |
3196 | mutex_lock(&root_udev_mutex); |
3197 | list_for_each_entry(udev, &root_udev, node) { | |
3198 | mutex_lock(&udev->cmdr_lock); | |
b6df4b79 | 3199 | |
dc335a99 MC |
3200 | if (!target_dev_configured(&udev->se_dev)) { |
3201 | mutex_unlock(&udev->cmdr_lock); | |
3202 | continue; | |
3203 | } | |
3204 | ||
89ec9cfd | 3205 | /* Try to complete the finished commands first */ |
bc2d214a BS |
3206 | if (tcmu_handle_completions(udev)) |
3207 | run_qfull_queue(udev, false); | |
d906d8af | 3208 | |
af1dd7ff MC |
3209 | /* Skip the udevs in idle */ |
3210 | if (!udev->dbi_thresh) { | |
89ec9cfd MC |
3211 | mutex_unlock(&udev->cmdr_lock); |
3212 | continue; | |
3213 | } | |
b6df4b79 | 3214 | |
89ec9cfd MC |
3215 | end = udev->dbi_max + 1; |
3216 | block = find_last_bit(udev->data_bitmap, end); | |
3217 | if (block == udev->dbi_max) { | |
3218 | /* | |
af1dd7ff MC |
3219 | * The last bit is dbi_max, so it is not possible |
3220 | * reclaim any blocks. | |
89ec9cfd MC |
3221 | */ |
3222 | mutex_unlock(&udev->cmdr_lock); | |
3223 | continue; | |
3224 | } else if (block == end) { | |
3225 | /* The current udev will goto idle state */ | |
3226 | udev->dbi_thresh = start = 0; | |
3227 | udev->dbi_max = 0; | |
3228 | } else { | |
3229 | udev->dbi_thresh = start = block + 1; | |
3230 | udev->dbi_max = block; | |
3231 | } | |
b6df4b79 | 3232 | |
bb9b9eb0 XW |
3233 | /* |
3234 | * Release the block pages. | |
3235 | * | |
3236 | * Also note that since tcmu_vma_fault() gets an extra page | |
3237 | * refcount, tcmu_blocks_release() won't free pages if pages | |
3238 | * are mapped. This means it is safe to call | |
3239 | * tcmu_blocks_release() before unmap_mapping_range() which | |
3240 | * drops the refcount of any pages it unmaps and thus releases | |
3241 | * them. | |
3242 | */ | |
3243 | pages_freed = tcmu_blocks_release(udev, start, end - 1); | |
3244 | ||
89ec9cfd | 3245 | /* Here will truncate the data area from off */ |
e719afdc | 3246 | off = udev->data_off + (loff_t)start * udev->data_blk_size; |
89ec9cfd | 3247 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); |
b6df4b79 | 3248 | |
89ec9cfd | 3249 | mutex_unlock(&udev->cmdr_lock); |
b6df4b79 | 3250 | |
f5ce815f BS |
3251 | total_pages_freed += pages_freed; |
3252 | total_blocks_freed += end - start; | |
3253 | pr_debug("Freed %u pages (total %u) from %u blocks (total %u) from %s.\n", | |
3254 | pages_freed, total_pages_freed, end - start, | |
3255 | total_blocks_freed, udev->name); | |
89ec9cfd MC |
3256 | } |
3257 | mutex_unlock(&root_udev_mutex); | |
af1dd7ff | 3258 | |
8b084d9d | 3259 | if (atomic_read(&global_page_count) > tcmu_global_max_pages) |
af1dd7ff | 3260 | schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000)); |
89ec9cfd MC |
3261 | } |
3262 | ||
488ebe4c MC |
3263 | static void check_timedout_devices(void) |
3264 | { | |
3265 | struct tcmu_dev *udev, *tmp_dev; | |
61fb2482 | 3266 | struct tcmu_cmd *cmd, *tmp_cmd; |
488ebe4c MC |
3267 | LIST_HEAD(devs); |
3268 | ||
3269 | spin_lock_bh(&timed_out_udevs_lock); | |
3270 | list_splice_init(&timed_out_udevs, &devs); | |
3271 | ||
3272 | list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) { | |
3273 | list_del_init(&udev->timedout_entry); | |
3274 | spin_unlock_bh(&timed_out_udevs_lock); | |
3275 | ||
6fddcb77 | 3276 | mutex_lock(&udev->cmdr_lock); |
a94a2572 | 3277 | |
61fb2482 BS |
3278 | /* |
3279 | * If cmd_time_out is disabled but qfull is set deadline | |
3280 | * will only reflect the qfull timeout. Ignore it. | |
3281 | */ | |
3282 | if (udev->cmd_time_out) { | |
3283 | list_for_each_entry_safe(cmd, tmp_cmd, | |
3284 | &udev->inflight_queue, | |
3285 | queue_entry) { | |
3286 | tcmu_check_expired_ring_cmd(cmd); | |
3287 | } | |
3288 | tcmu_set_next_deadline(&udev->inflight_queue, | |
3289 | &udev->cmd_timer); | |
3290 | } | |
3291 | list_for_each_entry_safe(cmd, tmp_cmd, &udev->qfull_queue, | |
3292 | queue_entry) { | |
3293 | tcmu_check_expired_queue_cmd(cmd); | |
3294 | } | |
a94a2572 XL |
3295 | tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); |
3296 | ||
6fddcb77 | 3297 | mutex_unlock(&udev->cmdr_lock); |
488ebe4c MC |
3298 | |
3299 | spin_lock_bh(&timed_out_udevs_lock); | |
3300 | } | |
3301 | ||
3302 | spin_unlock_bh(&timed_out_udevs_lock); | |
3303 | } | |
3304 | ||
9972cebb | 3305 | static void tcmu_unmap_work_fn(struct work_struct *work) |
89ec9cfd | 3306 | { |
488ebe4c | 3307 | check_timedout_devices(); |
9972cebb | 3308 | find_free_blocks(); |
b6df4b79 XL |
3309 | } |
3310 | ||
7c9e7a6f AG |
3311 | static int __init tcmu_module_init(void) |
3312 | { | |
801fc54d | 3313 | int ret, i, k, len = 0; |
7c9e7a6f AG |
3314 | |
3315 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
3316 | ||
af1dd7ff | 3317 | INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn); |
9972cebb | 3318 | |
7c9e7a6f AG |
3319 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", |
3320 | sizeof(struct tcmu_cmd), | |
3321 | __alignof__(struct tcmu_cmd), | |
3322 | 0, NULL); | |
3323 | if (!tcmu_cmd_cache) | |
3324 | return -ENOMEM; | |
3325 | ||
3326 | tcmu_root_device = root_device_register("tcm_user"); | |
3327 | if (IS_ERR(tcmu_root_device)) { | |
3328 | ret = PTR_ERR(tcmu_root_device); | |
3329 | goto out_free_cache; | |
3330 | } | |
3331 | ||
3332 | ret = genl_register_family(&tcmu_genl_family); | |
3333 | if (ret < 0) { | |
3334 | goto out_unreg_device; | |
3335 | } | |
3336 | ||
4703b625 | 3337 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
7d7a7435 | 3338 | len += sizeof(struct configfs_attribute *); |
4703b625 BS |
3339 | for (i = 0; passthrough_pr_attrib_attrs[i] != NULL; i++) |
3340 | len += sizeof(struct configfs_attribute *); | |
3341 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) | |
801fc54d | 3342 | len += sizeof(struct configfs_attribute *); |
801fc54d | 3343 | len += sizeof(struct configfs_attribute *); |
7d7a7435 NB |
3344 | |
3345 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
3346 | if (!tcmu_attrs) { | |
3347 | ret = -ENOMEM; | |
3348 | goto out_unreg_genl; | |
3349 | } | |
3350 | ||
4703b625 | 3351 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) |
7d7a7435 | 3352 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; |
4703b625 BS |
3353 | for (k = 0; passthrough_pr_attrib_attrs[k] != NULL; k++) |
3354 | tcmu_attrs[i++] = passthrough_pr_attrib_attrs[k]; | |
3355 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) | |
3356 | tcmu_attrs[i++] = tcmu_attrib_attrs[k]; | |
7d7a7435 NB |
3357 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
3358 | ||
0a06d430 | 3359 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 3360 | if (ret) |
7d7a7435 | 3361 | goto out_attrs; |
7c9e7a6f AG |
3362 | |
3363 | return 0; | |
3364 | ||
7d7a7435 NB |
3365 | out_attrs: |
3366 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
3367 | out_unreg_genl: |
3368 | genl_unregister_family(&tcmu_genl_family); | |
3369 | out_unreg_device: | |
3370 | root_device_unregister(tcmu_root_device); | |
3371 | out_free_cache: | |
3372 | kmem_cache_destroy(tcmu_cmd_cache); | |
3373 | ||
3374 | return ret; | |
3375 | } | |
3376 | ||
3377 | static void __exit tcmu_module_exit(void) | |
3378 | { | |
af1dd7ff | 3379 | cancel_delayed_work_sync(&tcmu_unmap_work); |
0a06d430 | 3380 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 3381 | kfree(tcmu_attrs); |
7c9e7a6f AG |
3382 | genl_unregister_family(&tcmu_genl_family); |
3383 | root_device_unregister(tcmu_root_device); | |
3384 | kmem_cache_destroy(tcmu_cmd_cache); | |
3385 | } | |
3386 | ||
3387 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
3388 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
3389 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
3390 | MODULE_LICENSE("GPL"); | |
3391 | ||
3392 | module_init(tcmu_module_init); | |
3393 | module_exit(tcmu_module_exit); |