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7c9e7a6f AG |
1 | /* |
2 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
3 | * Copyright (C) 2014 Red Hat, Inc. | |
f97ec7db | 4 | * Copyright (C) 2015 Arrikto, Inc. |
141685a3 | 5 | * Copyright (C) 2017 Chinamobile, Inc. |
7c9e7a6f AG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/spinlock.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/idr.h> | |
ba929992 | 24 | #include <linux/kernel.h> |
7c9e7a6f AG |
25 | #include <linux/timer.h> |
26 | #include <linux/parser.h> | |
5538d294 | 27 | #include <linux/vmalloc.h> |
7c9e7a6f | 28 | #include <linux/uio_driver.h> |
141685a3 | 29 | #include <linux/radix-tree.h> |
ac64a2ce | 30 | #include <linux/stringify.h> |
26418649 | 31 | #include <linux/bitops.h> |
f5045724 | 32 | #include <linux/highmem.h> |
7d7a7435 | 33 | #include <linux/configfs.h> |
b6df4b79 XL |
34 | #include <linux/mutex.h> |
35 | #include <linux/kthread.h> | |
7c9e7a6f | 36 | #include <net/genetlink.h> |
ba929992 BVA |
37 | #include <scsi/scsi_common.h> |
38 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
39 | #include <target/target_core_base.h> |
40 | #include <target/target_core_fabric.h> | |
41 | #include <target/target_core_backend.h> | |
e9f720d6 | 42 | |
7c9e7a6f AG |
43 | #include <linux/target_core_user.h> |
44 | ||
45 | /* | |
46 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
47 | * data to userspace for processing. This is to allow backends that | |
48 | * are too complex for in-kernel support to be possible. | |
49 | * | |
50 | * It uses the UIO framework to do a lot of the device-creation and | |
51 | * introspection work for us. | |
52 | * | |
53 | * See the .h file for how the ring is laid out. Note that while the | |
54 | * command ring is defined, the particulars of the data area are | |
55 | * not. Offset values in the command entry point to other locations | |
56 | * internal to the mmap()ed area. There is separate space outside the | |
57 | * command ring for data buffers. This leaves maximum flexibility for | |
58 | * moving buffer allocations, or even page flipping or other | |
59 | * allocation techniques, without altering the command ring layout. | |
60 | * | |
61 | * SECURITY: | |
62 | * The user process must be assumed to be malicious. There's no way to | |
63 | * prevent it breaking the command ring protocol if it wants, but in | |
64 | * order to prevent other issues we must only ever read *data* from | |
65 | * the shared memory area, not offsets or sizes. This applies to | |
66 | * command ring entries as well as the mailbox. Extra code needed for | |
67 | * this may have a 'UAM' comment. | |
68 | */ | |
69 | ||
7c9e7a6f AG |
70 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
71 | ||
b6df4b79 XL |
72 | /* For cmd area, the size is fixed 8MB */ |
73 | #define CMDR_SIZE (8 * 1024 * 1024) | |
26418649 | 74 | |
b6df4b79 XL |
75 | /* |
76 | * For data area, the block size is PAGE_SIZE and | |
77 | * the total size is 256K * PAGE_SIZE. | |
78 | */ | |
79 | #define DATA_BLOCK_SIZE PAGE_SIZE | |
80 | #define DATA_BLOCK_BITS (256 * 1024) | |
26418649 | 81 | #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) |
b6df4b79 | 82 | #define DATA_BLOCK_INIT_BITS 128 |
7c9e7a6f | 83 | |
b6df4b79 | 84 | /* The total size of the ring is 8M + 256K * PAGE_SIZE */ |
7c9e7a6f AG |
85 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) |
86 | ||
b6df4b79 XL |
87 | /* Default maximum of the global data blocks(512K * PAGE_SIZE) */ |
88 | #define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024) | |
89 | ||
b3af66e2 MC |
90 | static u8 tcmu_kern_cmd_reply_supported; |
91 | ||
7c9e7a6f AG |
92 | static struct device *tcmu_root_device; |
93 | ||
94 | struct tcmu_hba { | |
95 | u32 host_id; | |
96 | }; | |
97 | ||
7c9e7a6f AG |
98 | #define TCMU_CONFIG_LEN 256 |
99 | ||
b3af66e2 MC |
100 | struct tcmu_nl_cmd { |
101 | /* wake up thread waiting for reply */ | |
102 | struct completion complete; | |
103 | int cmd; | |
104 | int status; | |
105 | }; | |
106 | ||
7c9e7a6f | 107 | struct tcmu_dev { |
b6df4b79 | 108 | struct list_head node; |
f3cdbe39 | 109 | struct kref kref; |
7c9e7a6f AG |
110 | struct se_device se_dev; |
111 | ||
112 | char *name; | |
113 | struct se_hba *hba; | |
114 | ||
115 | #define TCMU_DEV_BIT_OPEN 0 | |
116 | #define TCMU_DEV_BIT_BROKEN 1 | |
117 | unsigned long flags; | |
7c9e7a6f AG |
118 | |
119 | struct uio_info uio_info; | |
120 | ||
b6df4b79 XL |
121 | struct inode *inode; |
122 | ||
7c9e7a6f AG |
123 | struct tcmu_mailbox *mb_addr; |
124 | size_t dev_size; | |
125 | u32 cmdr_size; | |
126 | u32 cmdr_last_cleaned; | |
3d9b9555 | 127 | /* Offset of data area from start of mb */ |
26418649 | 128 | /* Must add data_off and mb_addr to get the address */ |
7c9e7a6f AG |
129 | size_t data_off; |
130 | size_t data_size; | |
26418649 | 131 | |
7c9e7a6f | 132 | wait_queue_head_t wait_cmdr; |
b6df4b79 | 133 | struct mutex cmdr_lock; |
7c9e7a6f | 134 | |
b6df4b79 | 135 | bool waiting_global; |
141685a3 | 136 | uint32_t dbi_max; |
b6df4b79 | 137 | uint32_t dbi_thresh; |
141685a3 XL |
138 | DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS); |
139 | struct radix_tree_root data_blocks; | |
140 | ||
7c9e7a6f AG |
141 | struct idr commands; |
142 | spinlock_t commands_lock; | |
143 | ||
144 | struct timer_list timeout; | |
af980e46 | 145 | unsigned int cmd_time_out; |
7c9e7a6f | 146 | |
b3af66e2 MC |
147 | spinlock_t nl_cmd_lock; |
148 | struct tcmu_nl_cmd curr_nl_cmd; | |
149 | /* wake up threads waiting on curr_nl_cmd */ | |
150 | wait_queue_head_t nl_cmd_wq; | |
151 | ||
7c9e7a6f AG |
152 | char dev_config[TCMU_CONFIG_LEN]; |
153 | }; | |
154 | ||
155 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
156 | ||
157 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
158 | ||
159 | struct tcmu_cmd { | |
160 | struct se_cmd *se_cmd; | |
161 | struct tcmu_dev *tcmu_dev; | |
162 | ||
163 | uint16_t cmd_id; | |
164 | ||
26418649 | 165 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 166 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
167 | uint32_t dbi_cnt; |
168 | uint32_t dbi_cur; | |
169 | uint32_t *dbi; | |
7c9e7a6f AG |
170 | |
171 | unsigned long deadline; | |
172 | ||
173 | #define TCMU_CMD_BIT_EXPIRED 0 | |
174 | unsigned long flags; | |
175 | }; | |
176 | ||
b6df4b79 XL |
177 | static struct task_struct *unmap_thread; |
178 | static wait_queue_head_t unmap_wait; | |
179 | static DEFINE_MUTEX(root_udev_mutex); | |
180 | static LIST_HEAD(root_udev); | |
181 | ||
182 | static atomic_t global_db_count = ATOMIC_INIT(0); | |
183 | ||
7c9e7a6f AG |
184 | static struct kmem_cache *tcmu_cmd_cache; |
185 | ||
186 | /* multicast group */ | |
187 | enum tcmu_multicast_groups { | |
188 | TCMU_MCGRP_CONFIG, | |
189 | }; | |
190 | ||
191 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
192 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
193 | }; | |
194 | ||
b3af66e2 MC |
195 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
196 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
197 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
198 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
199 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
200 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
201 | }; | |
202 | ||
203 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
204 | { | |
205 | struct se_device *dev; | |
206 | struct tcmu_dev *udev; | |
207 | struct tcmu_nl_cmd *nl_cmd; | |
208 | int dev_id, rc, ret = 0; | |
209 | bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); | |
210 | ||
211 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
212 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
213 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
218 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
219 | ||
220 | dev = target_find_device(dev_id, !is_removed); | |
221 | if (!dev) { | |
222 | printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", | |
223 | completed_cmd, rc, dev_id); | |
224 | return -ENODEV; | |
225 | } | |
226 | udev = TCMU_DEV(dev); | |
227 | ||
228 | spin_lock(&udev->nl_cmd_lock); | |
229 | nl_cmd = &udev->curr_nl_cmd; | |
230 | ||
231 | pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, | |
232 | nl_cmd->cmd, completed_cmd, rc); | |
233 | ||
234 | if (nl_cmd->cmd != completed_cmd) { | |
235 | printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", | |
236 | completed_cmd, nl_cmd->cmd); | |
237 | ret = -EINVAL; | |
238 | } else { | |
239 | nl_cmd->status = rc; | |
240 | } | |
241 | ||
242 | spin_unlock(&udev->nl_cmd_lock); | |
243 | if (!is_removed) | |
244 | target_undepend_item(&dev->dev_group.cg_item); | |
245 | if (!ret) | |
246 | complete(&nl_cmd->complete); | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
251 | { | |
252 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
253 | } | |
254 | ||
255 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
256 | { | |
257 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
258 | } | |
259 | ||
260 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
261 | struct genl_info *info) | |
262 | { | |
263 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
264 | } | |
265 | ||
266 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
267 | { | |
268 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
269 | tcmu_kern_cmd_reply_supported = | |
270 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
271 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
272 | tcmu_kern_cmd_reply_supported); | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static const struct genl_ops tcmu_genl_ops[] = { | |
279 | { | |
280 | .cmd = TCMU_CMD_SET_FEATURES, | |
281 | .flags = GENL_ADMIN_PERM, | |
282 | .policy = tcmu_attr_policy, | |
283 | .doit = tcmu_genl_set_features, | |
284 | }, | |
285 | { | |
286 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
287 | .flags = GENL_ADMIN_PERM, | |
288 | .policy = tcmu_attr_policy, | |
289 | .doit = tcmu_genl_add_dev_done, | |
290 | }, | |
291 | { | |
292 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
293 | .flags = GENL_ADMIN_PERM, | |
294 | .policy = tcmu_attr_policy, | |
295 | .doit = tcmu_genl_rm_dev_done, | |
296 | }, | |
297 | { | |
298 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
299 | .flags = GENL_ADMIN_PERM, | |
300 | .policy = tcmu_attr_policy, | |
301 | .doit = tcmu_genl_reconfig_dev_done, | |
302 | }, | |
303 | }; | |
304 | ||
7c9e7a6f | 305 | /* Our generic netlink family */ |
56989f6d | 306 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 307 | .module = THIS_MODULE, |
7c9e7a6f AG |
308 | .hdrsize = 0, |
309 | .name = "TCM-USER", | |
b3af66e2 | 310 | .version = 2, |
7c9e7a6f AG |
311 | .maxattr = TCMU_ATTR_MAX, |
312 | .mcgrps = tcmu_mcgrps, | |
313 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 314 | .netnsok = true, |
b3af66e2 MC |
315 | .ops = tcmu_genl_ops, |
316 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
317 | }; |
318 | ||
141685a3 XL |
319 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
320 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
321 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
322 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
323 | ||
b6df4b79 | 324 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
325 | { |
326 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
327 | uint32_t i; | |
328 | ||
b6df4b79 | 329 | for (i = 0; i < len; i++) |
141685a3 XL |
330 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
331 | } | |
332 | ||
b6df4b79 XL |
333 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
334 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 335 | { |
b6df4b79 XL |
336 | struct page *page; |
337 | int ret, dbi; | |
141685a3 | 338 | |
b6df4b79 XL |
339 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
340 | if (dbi == udev->dbi_thresh) | |
341 | return false; | |
141685a3 | 342 | |
b6df4b79 XL |
343 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
344 | if (!page) { | |
141685a3 | 345 | |
b6df4b79 XL |
346 | if (atomic_add_return(1, &global_db_count) > |
347 | TCMU_GLOBAL_MAX_BLOCKS) { | |
348 | atomic_dec(&global_db_count); | |
349 | return false; | |
141685a3 XL |
350 | } |
351 | ||
b6df4b79 XL |
352 | /* try to get new page from the mm */ |
353 | page = alloc_page(GFP_KERNEL); | |
354 | if (!page) | |
355 | return false; | |
356 | ||
357 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
141685a3 | 358 | if (ret) { |
b6df4b79 XL |
359 | __free_page(page); |
360 | return false; | |
141685a3 | 361 | } |
b6df4b79 | 362 | |
141685a3 XL |
363 | } |
364 | ||
b6df4b79 XL |
365 | if (dbi > udev->dbi_max) |
366 | udev->dbi_max = dbi; | |
367 | ||
368 | set_bit(dbi, udev->data_bitmap); | |
369 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
370 | ||
371 | return true; | |
141685a3 XL |
372 | } |
373 | ||
b6df4b79 XL |
374 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
375 | struct tcmu_cmd *tcmu_cmd) | |
376 | { | |
377 | int i; | |
378 | ||
379 | udev->waiting_global = false; | |
380 | ||
381 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { | |
382 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
383 | goto err; | |
384 | } | |
385 | return true; | |
386 | ||
387 | err: | |
388 | udev->waiting_global = true; | |
389 | /* Try to wake up the unmap thread */ | |
390 | wake_up(&unmap_wait); | |
391 | return false; | |
392 | } | |
393 | ||
394 | static inline struct page * | |
395 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
396 | { |
397 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
398 | } | |
399 | ||
400 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
401 | { | |
402 | kfree(tcmu_cmd->dbi); | |
403 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
404 | } | |
405 | ||
406 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
407 | { | |
408 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
409 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
410 | ||
411 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
412 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
413 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
414 | DATA_BLOCK_SIZE); | |
415 | } | |
416 | ||
417 | return data_length; | |
418 | } | |
419 | ||
420 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
421 | { | |
422 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
423 | ||
424 | return data_length / DATA_BLOCK_SIZE; | |
425 | } | |
426 | ||
7c9e7a6f AG |
427 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
428 | { | |
429 | struct se_device *se_dev = se_cmd->se_dev; | |
430 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
431 | struct tcmu_cmd *tcmu_cmd; | |
432 | int cmd_id; | |
433 | ||
434 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
435 | if (!tcmu_cmd) | |
436 | return NULL; | |
437 | ||
438 | tcmu_cmd->se_cmd = se_cmd; | |
439 | tcmu_cmd->tcmu_dev = udev; | |
af980e46 MC |
440 | if (udev->cmd_time_out) |
441 | tcmu_cmd->deadline = jiffies + | |
442 | msecs_to_jiffies(udev->cmd_time_out); | |
7c9e7a6f | 443 | |
141685a3 XL |
444 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
445 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
446 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
447 | GFP_KERNEL); | |
448 | if (!tcmu_cmd->dbi) { | |
449 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
450 | return NULL; | |
451 | } | |
452 | ||
7c9e7a6f AG |
453 | idr_preload(GFP_KERNEL); |
454 | spin_lock_irq(&udev->commands_lock); | |
455 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0, | |
456 | USHRT_MAX, GFP_NOWAIT); | |
457 | spin_unlock_irq(&udev->commands_lock); | |
458 | idr_preload_end(); | |
459 | ||
460 | if (cmd_id < 0) { | |
141685a3 | 461 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
462 | return NULL; |
463 | } | |
464 | tcmu_cmd->cmd_id = cmd_id; | |
465 | ||
466 | return tcmu_cmd; | |
467 | } | |
468 | ||
469 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
470 | { | |
b75d8063 | 471 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
472 | |
473 | size = round_up(size+offset, PAGE_SIZE); | |
474 | vaddr -= offset; | |
475 | ||
476 | while (size) { | |
477 | flush_dcache_page(virt_to_page(vaddr)); | |
478 | size -= PAGE_SIZE; | |
479 | } | |
480 | } | |
481 | ||
482 | /* | |
483 | * Some ring helper functions. We don't assume size is a power of 2 so | |
484 | * we can't use circ_buf.h. | |
485 | */ | |
486 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
487 | { | |
488 | int diff = head - tail; | |
489 | ||
490 | if (diff >= 0) | |
491 | return diff; | |
492 | else | |
493 | return size + diff; | |
494 | } | |
495 | ||
496 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
497 | { | |
498 | /* Keep 1 byte unused or we can't tell full from empty */ | |
499 | return (size - spc_used(head, tail, size) - 1); | |
500 | } | |
501 | ||
502 | static inline size_t head_to_end(size_t head, size_t size) | |
503 | { | |
504 | return size - head; | |
505 | } | |
506 | ||
f1dbd087 SY |
507 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
508 | struct tcmu_dev *udev) | |
509 | { | |
510 | struct iovec *iovec; | |
511 | ||
512 | if (*iov_cnt != 0) | |
513 | (*iov)++; | |
514 | (*iov_cnt)++; | |
515 | ||
516 | iovec = *iov; | |
517 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
518 | } |
519 | ||
7c9e7a6f AG |
520 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
521 | ||
26418649 | 522 | /* offset is relative to mb_addr */ |
141685a3 XL |
523 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
524 | int dbi, int remaining) | |
26418649 | 525 | { |
141685a3 | 526 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
527 | DATA_BLOCK_SIZE - remaining; |
528 | } | |
529 | ||
530 | static inline size_t iov_tail(struct tcmu_dev *udev, struct iovec *iov) | |
531 | { | |
532 | return (size_t)iov->iov_base + iov->iov_len; | |
533 | } | |
534 | ||
b6df4b79 | 535 | static int scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
536 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
537 | unsigned int data_nents, struct iovec **iov, | |
538 | int *iov_cnt, bool copy_data) | |
f97ec7db | 539 | { |
141685a3 | 540 | int i, dbi; |
26418649 | 541 | int block_remaining = 0; |
141685a3 XL |
542 | void *from, *to = NULL; |
543 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 544 | struct scatterlist *sg; |
b6df4b79 | 545 | struct page *page; |
f97ec7db IT |
546 | |
547 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 548 | int sg_remaining = sg->length; |
f97ec7db | 549 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
550 | while (sg_remaining > 0) { |
551 | if (block_remaining == 0) { | |
b6df4b79 XL |
552 | if (to) |
553 | kunmap_atomic(to); | |
554 | ||
26418649 | 555 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
556 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
557 | page = tcmu_get_block_page(udev, dbi); | |
558 | to = kmap_atomic(page); | |
26418649 | 559 | } |
141685a3 | 560 | |
26418649 SY |
561 | copy_bytes = min_t(size_t, sg_remaining, |
562 | block_remaining); | |
141685a3 | 563 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 564 | block_remaining); |
141685a3 XL |
565 | offset = DATA_BLOCK_SIZE - block_remaining; |
566 | to = (void *)(unsigned long)to + offset; | |
567 | ||
26418649 SY |
568 | if (*iov_cnt != 0 && |
569 | to_offset == iov_tail(udev, *iov)) { | |
570 | (*iov)->iov_len += copy_bytes; | |
571 | } else { | |
572 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 573 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
574 | (*iov)->iov_len = copy_bytes; |
575 | } | |
f97ec7db | 576 | if (copy_data) { |
26418649 SY |
577 | memcpy(to, from + sg->length - sg_remaining, |
578 | copy_bytes); | |
f97ec7db IT |
579 | tcmu_flush_dcache_range(to, copy_bytes); |
580 | } | |
26418649 SY |
581 | sg_remaining -= copy_bytes; |
582 | block_remaining -= copy_bytes; | |
f97ec7db | 583 | } |
e2e21bd8 | 584 | kunmap_atomic(from - sg->offset); |
f97ec7db | 585 | } |
b6df4b79 XL |
586 | if (to) |
587 | kunmap_atomic(to); | |
f97ec7db | 588 | |
141685a3 | 589 | return 0; |
0c28481f SY |
590 | } |
591 | ||
a5d68ba8 XL |
592 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
593 | bool bidi) | |
f97ec7db | 594 | { |
a5d68ba8 | 595 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 596 | int i, dbi; |
26418649 | 597 | int block_remaining = 0; |
b6df4b79 | 598 | void *from = NULL, *to; |
141685a3 | 599 | size_t copy_bytes, offset; |
a5d68ba8 | 600 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 601 | struct page *page; |
a5d68ba8 | 602 | unsigned int data_nents; |
141685a3 | 603 | uint32_t count = 0; |
a5d68ba8 XL |
604 | |
605 | if (!bidi) { | |
606 | data_sg = se_cmd->t_data_sg; | |
607 | data_nents = se_cmd->t_data_nents; | |
608 | } else { | |
a5d68ba8 XL |
609 | |
610 | /* | |
611 | * For bidi case, the first count blocks are for Data-Out | |
612 | * buffer blocks, and before gathering the Data-In buffer | |
613 | * the Data-Out buffer blocks should be discarded. | |
614 | */ | |
615 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
616 | |
617 | data_sg = se_cmd->t_bidi_data_sg; | |
618 | data_nents = se_cmd->t_bidi_data_nents; | |
619 | } | |
f97ec7db | 620 | |
141685a3 XL |
621 | tcmu_cmd_set_dbi_cur(cmd, count); |
622 | ||
f97ec7db | 623 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 624 | int sg_remaining = sg->length; |
f97ec7db | 625 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
626 | while (sg_remaining > 0) { |
627 | if (block_remaining == 0) { | |
b6df4b79 XL |
628 | if (from) |
629 | kunmap_atomic(from); | |
630 | ||
26418649 | 631 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 632 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
633 | page = tcmu_get_block_page(udev, dbi); |
634 | from = kmap_atomic(page); | |
26418649 SY |
635 | } |
636 | copy_bytes = min_t(size_t, sg_remaining, | |
637 | block_remaining); | |
141685a3 XL |
638 | offset = DATA_BLOCK_SIZE - block_remaining; |
639 | from = (void *)(unsigned long)from + offset; | |
f97ec7db | 640 | tcmu_flush_dcache_range(from, copy_bytes); |
26418649 SY |
641 | memcpy(to + sg->length - sg_remaining, from, |
642 | copy_bytes); | |
f97ec7db | 643 | |
26418649 SY |
644 | sg_remaining -= copy_bytes; |
645 | block_remaining -= copy_bytes; | |
f97ec7db | 646 | } |
e2e21bd8 | 647 | kunmap_atomic(to - sg->offset); |
f97ec7db | 648 | } |
b6df4b79 XL |
649 | if (from) |
650 | kunmap_atomic(from); | |
f97ec7db IT |
651 | } |
652 | ||
b6df4b79 | 653 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 654 | { |
b6df4b79 | 655 | return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); |
26418649 SY |
656 | } |
657 | ||
7c9e7a6f | 658 | /* |
f97ec7db | 659 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 660 | * space available on the data area. |
7c9e7a6f AG |
661 | * |
662 | * Called with ring lock held. | |
663 | */ | |
b6df4b79 XL |
664 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
665 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
666 | { |
667 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
668 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
669 | / DATA_BLOCK_SIZE; | |
0241fd39 | 670 | size_t space, cmd_needed; |
7c9e7a6f AG |
671 | u32 cmd_head; |
672 | ||
673 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
674 | ||
675 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
676 | ||
f56574a2 AG |
677 | /* |
678 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
679 | * original cmd - cmds are internally contiguous. | |
680 | */ | |
681 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
682 | cmd_needed = cmd_size; | |
683 | else | |
684 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
685 | ||
7c9e7a6f AG |
686 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
687 | if (space < cmd_needed) { | |
688 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
689 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
690 | return false; | |
691 | } | |
692 | ||
b6df4b79 XL |
693 | /* try to check and get the data blocks as needed */ |
694 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
7c9e7a6f | 695 | if (space < data_needed) { |
b6df4b79 XL |
696 | unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; |
697 | unsigned long grow; | |
698 | ||
699 | if (blocks_left < blocks_needed) { | |
700 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
701 | blocks_left * DATA_BLOCK_SIZE, | |
702 | data_needed); | |
703 | return false; | |
704 | } | |
705 | ||
706 | /* Try to expand the thresh */ | |
707 | if (!udev->dbi_thresh) { | |
708 | /* From idle state */ | |
709 | uint32_t init_thresh = DATA_BLOCK_INIT_BITS; | |
710 | ||
711 | udev->dbi_thresh = max(blocks_needed, init_thresh); | |
712 | } else { | |
713 | /* | |
714 | * Grow the data area by max(blocks needed, | |
715 | * dbi_thresh / 2), but limited to the max | |
716 | * DATA_BLOCK_BITS size. | |
717 | */ | |
718 | grow = max(blocks_needed, udev->dbi_thresh / 2); | |
719 | udev->dbi_thresh += grow; | |
720 | if (udev->dbi_thresh > DATA_BLOCK_BITS) | |
721 | udev->dbi_thresh = DATA_BLOCK_BITS; | |
722 | } | |
7c9e7a6f AG |
723 | } |
724 | ||
b6df4b79 XL |
725 | if (!tcmu_get_empty_blocks(udev, cmd)) |
726 | return false; | |
727 | ||
7c9e7a6f AG |
728 | return true; |
729 | } | |
730 | ||
fe25cc34 XL |
731 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
732 | { | |
733 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
734 | sizeof(struct tcmu_cmd_entry)); | |
735 | } | |
736 | ||
737 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
738 | size_t base_command_size) | |
739 | { | |
740 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
741 | size_t command_size; | |
742 | ||
743 | command_size = base_command_size + | |
744 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
745 | TCMU_OP_ALIGN_SIZE); | |
746 | ||
747 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
748 | ||
749 | return command_size; | |
750 | } | |
751 | ||
02eb924f AG |
752 | static sense_reason_t |
753 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
754 | { |
755 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
756 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
757 | size_t base_command_size, command_size; | |
7c9e7a6f | 758 | struct tcmu_mailbox *mb; |
7c9e7a6f | 759 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 760 | struct iovec *iov; |
141685a3 | 761 | int iov_cnt, ret; |
7c9e7a6f AG |
762 | uint32_t cmd_head; |
763 | uint64_t cdb_off; | |
f97ec7db | 764 | bool copy_to_data_area; |
ab22d260 | 765 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
766 | |
767 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 768 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
769 | |
770 | /* | |
771 | * Must be a certain minimum size for response sense info, but | |
772 | * also may be larger if the iov array is large. | |
773 | * | |
fe25cc34 XL |
774 | * We prepare as many iovs as possbile for potential uses here, |
775 | * because it's expensive to tell how many regions are freed in | |
776 | * the bitmap & global data pool, as the size calculated here | |
777 | * will only be used to do the checks. | |
778 | * | |
779 | * The size will be recalculated later as actually needed to save | |
780 | * cmd area memories. | |
781 | */ | |
782 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
783 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 784 | |
b6df4b79 | 785 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
786 | |
787 | mb = udev->mb_addr; | |
788 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
789 | if ((command_size > (udev->cmdr_size / 2)) || |
790 | data_length > udev->data_size) { | |
791 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 792 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 793 | udev->cmdr_size, udev->data_size); |
b6df4b79 | 794 | mutex_unlock(&udev->cmdr_lock); |
554617b2 AG |
795 | return TCM_INVALID_CDB_FIELD; |
796 | } | |
7c9e7a6f | 797 | |
b6df4b79 | 798 | while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
7c9e7a6f AG |
799 | int ret; |
800 | DEFINE_WAIT(__wait); | |
801 | ||
802 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); | |
803 | ||
804 | pr_debug("sleeping for ring space\n"); | |
b6df4b79 | 805 | mutex_unlock(&udev->cmdr_lock); |
af980e46 MC |
806 | if (udev->cmd_time_out) |
807 | ret = schedule_timeout( | |
808 | msecs_to_jiffies(udev->cmd_time_out)); | |
809 | else | |
810 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
811 | finish_wait(&udev->wait_cmdr, &__wait); |
812 | if (!ret) { | |
813 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 814 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
815 | } |
816 | ||
b6df4b79 | 817 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
818 | |
819 | /* We dropped cmdr_lock, cmd_head is stale */ | |
820 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
821 | } | |
822 | ||
f56574a2 AG |
823 | /* Insert a PAD if end-of-ring space is too small */ |
824 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
825 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
826 | ||
7c9e7a6f AG |
827 | entry = (void *) mb + CMDR_OFF + cmd_head; |
828 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 AG |
829 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
830 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
831 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
832 | entry->hdr.kflags = 0; | |
833 | entry->hdr.uflags = 0; | |
7c9e7a6f AG |
834 | |
835 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
836 | ||
837 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
838 | WARN_ON(cmd_head != 0); | |
839 | } | |
840 | ||
841 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
842 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
0ad46af8 | 843 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
0ad46af8 AG |
844 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; |
845 | entry->hdr.kflags = 0; | |
846 | entry->hdr.uflags = 0; | |
7c9e7a6f | 847 | |
3d9b9555 | 848 | /* Handle allocating space from the data area */ |
b6df4b79 | 849 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 850 | iov = &entry->req.iov[0]; |
f97ec7db | 851 | iov_cnt = 0; |
e4648b01 IT |
852 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
853 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
b6df4b79 XL |
854 | ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
855 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
856 | copy_to_data_area); | |
141685a3 | 857 | if (ret) { |
b6df4b79 XL |
858 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
859 | mutex_unlock(&udev->cmdr_lock); | |
860 | ||
141685a3 XL |
861 | pr_err("tcmu: alloc and scatter data failed\n"); |
862 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
863 | } | |
7c9e7a6f | 864 | entry->req.iov_cnt = iov_cnt; |
0ad46af8 | 865 | entry->req.iov_dif_cnt = 0; |
7c9e7a6f | 866 | |
e4648b01 | 867 | /* Handle BIDI commands */ |
ab22d260 XL |
868 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
869 | iov_cnt = 0; | |
870 | iov++; | |
b6df4b79 | 871 | ret = scatter_data_area(udev, tcmu_cmd, |
141685a3 XL |
872 | se_cmd->t_bidi_data_sg, |
873 | se_cmd->t_bidi_data_nents, | |
874 | &iov, &iov_cnt, false); | |
875 | if (ret) { | |
b6df4b79 XL |
876 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
877 | mutex_unlock(&udev->cmdr_lock); | |
878 | ||
141685a3 XL |
879 | pr_err("tcmu: alloc and scatter bidi data failed\n"); |
880 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
881 | } | |
ab22d260 XL |
882 | entry->req.iov_bidi_cnt = iov_cnt; |
883 | } | |
26418649 | 884 | |
fe25cc34 XL |
885 | /* |
886 | * Recalaulate the command's base size and size according | |
887 | * to the actual needs | |
888 | */ | |
889 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
890 | entry->req.iov_bidi_cnt); | |
891 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
892 | ||
893 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
894 | ||
7c9e7a6f AG |
895 | /* All offsets relative to mb_addr, not start of entry! */ |
896 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
897 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
898 | entry->req.cdb_off = cdb_off; | |
899 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
900 | ||
901 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
902 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
b6df4b79 | 903 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
904 | |
905 | /* TODO: only if FLUSH and FUA? */ | |
906 | uio_event_notify(&udev->uio_info); | |
907 | ||
af980e46 MC |
908 | if (udev->cmd_time_out) |
909 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
910 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 911 | |
02eb924f | 912 | return TCM_NO_SENSE; |
7c9e7a6f AG |
913 | } |
914 | ||
02eb924f AG |
915 | static sense_reason_t |
916 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f AG |
917 | { |
918 | struct se_device *se_dev = se_cmd->se_dev; | |
919 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
920 | struct tcmu_cmd *tcmu_cmd; | |
ecaf597b | 921 | sense_reason_t ret; |
7c9e7a6f AG |
922 | |
923 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
924 | if (!tcmu_cmd) | |
02eb924f | 925 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
926 | |
927 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 928 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f AG |
929 | pr_err("TCMU: Could not queue command\n"); |
930 | spin_lock_irq(&udev->commands_lock); | |
931 | idr_remove(&udev->commands, tcmu_cmd->cmd_id); | |
932 | spin_unlock_irq(&udev->commands_lock); | |
933 | ||
141685a3 | 934 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
935 | } |
936 | ||
937 | return ret; | |
938 | } | |
939 | ||
940 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
941 | { | |
942 | struct se_cmd *se_cmd = cmd->se_cmd; | |
943 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
944 | ||
141685a3 XL |
945 | /* |
946 | * cmd has been completed already from timeout, just reclaim | |
947 | * data area space and free cmd | |
948 | */ | |
949 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
950 | goto out; | |
b25c7863 | 951 | |
141685a3 | 952 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 953 | |
0ad46af8 | 954 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
955 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
956 | cmd->se_cmd); | |
ed97d0cd AG |
957 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
958 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
7c9e7a6f AG |
959 | memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer, |
960 | se_cmd->scsi_sense_length); | |
e4648b01 | 961 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 962 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 963 | gather_data_area(udev, cmd, true); |
e4648b01 | 964 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 965 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 966 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 967 | /* TODO: */ |
2bc396a2 IT |
968 | } else if (se_cmd->data_direction != DMA_NONE) { |
969 | pr_warn("TCMU: data direction was %d!\n", | |
970 | se_cmd->data_direction); | |
7c9e7a6f AG |
971 | } |
972 | ||
973 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 974 | |
141685a3 XL |
975 | out: |
976 | cmd->se_cmd = NULL; | |
b6df4b79 | 977 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 978 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
979 | } |
980 | ||
981 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
982 | { | |
983 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
984 | int handled = 0; |
985 | ||
986 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
987 | pr_err("ring broken, not handling completions\n"); | |
988 | return 0; | |
989 | } | |
990 | ||
7c9e7a6f AG |
991 | mb = udev->mb_addr; |
992 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
993 | ||
994 | while (udev->cmdr_last_cleaned != ACCESS_ONCE(mb->cmd_tail)) { | |
995 | ||
996 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
997 | struct tcmu_cmd *cmd; | |
998 | ||
999 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
1000 | ||
0ad46af8 AG |
1001 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
1002 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
1003 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1004 | udev->cmdr_size); | |
7c9e7a6f AG |
1005 | continue; |
1006 | } | |
0ad46af8 | 1007 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
1008 | |
1009 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 1010 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
1011 | spin_unlock(&udev->commands_lock); |
1012 | ||
1013 | if (!cmd) { | |
1014 | pr_err("cmd_id not found, ring is broken\n"); | |
1015 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1016 | break; | |
1017 | } | |
1018 | ||
1019 | tcmu_handle_completion(cmd, entry); | |
1020 | ||
0ad46af8 AG |
1021 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1022 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1023 | udev->cmdr_size); | |
7c9e7a6f AG |
1024 | |
1025 | handled++; | |
1026 | } | |
1027 | ||
1028 | if (mb->cmd_tail == mb->cmd_head) | |
1029 | del_timer(&udev->timeout); /* no more pending cmds */ | |
1030 | ||
7c9e7a6f AG |
1031 | wake_up(&udev->wait_cmdr); |
1032 | ||
1033 | return handled; | |
1034 | } | |
1035 | ||
1036 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
1037 | { | |
1038 | struct tcmu_cmd *cmd = p; | |
1039 | ||
1040 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
1041 | return 0; | |
1042 | ||
611e2267 | 1043 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
1044 | return 0; |
1045 | ||
1046 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1047 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
1048 | cmd->se_cmd = NULL; | |
1049 | ||
7c9e7a6f AG |
1050 | return 0; |
1051 | } | |
1052 | ||
1053 | static void tcmu_device_timedout(unsigned long data) | |
1054 | { | |
1055 | struct tcmu_dev *udev = (struct tcmu_dev *)data; | |
1056 | unsigned long flags; | |
7c9e7a6f AG |
1057 | |
1058 | spin_lock_irqsave(&udev->commands_lock, flags); | |
1059 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
1060 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
1061 | ||
b6df4b79 XL |
1062 | /* Try to wake up the ummap thread */ |
1063 | wake_up(&unmap_wait); | |
1064 | ||
7c9e7a6f AG |
1065 | /* |
1066 | * We don't need to wakeup threads on wait_cmdr since they have their | |
1067 | * own timeout. | |
1068 | */ | |
1069 | } | |
1070 | ||
1071 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
1072 | { | |
1073 | struct tcmu_hba *tcmu_hba; | |
1074 | ||
1075 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1076 | if (!tcmu_hba) | |
1077 | return -ENOMEM; | |
1078 | ||
1079 | tcmu_hba->host_id = host_id; | |
1080 | hba->hba_ptr = tcmu_hba; | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | static void tcmu_detach_hba(struct se_hba *hba) | |
1086 | { | |
1087 | kfree(hba->hba_ptr); | |
1088 | hba->hba_ptr = NULL; | |
1089 | } | |
1090 | ||
1091 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1092 | { | |
1093 | struct tcmu_dev *udev; | |
1094 | ||
1095 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1096 | if (!udev) | |
1097 | return NULL; | |
f3cdbe39 | 1098 | kref_init(&udev->kref); |
7c9e7a6f AG |
1099 | |
1100 | udev->name = kstrdup(name, GFP_KERNEL); | |
1101 | if (!udev->name) { | |
1102 | kfree(udev); | |
1103 | return NULL; | |
1104 | } | |
1105 | ||
1106 | udev->hba = hba; | |
af980e46 | 1107 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
1108 | |
1109 | init_waitqueue_head(&udev->wait_cmdr); | |
b6df4b79 | 1110 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f AG |
1111 | |
1112 | idr_init(&udev->commands); | |
1113 | spin_lock_init(&udev->commands_lock); | |
1114 | ||
1115 | setup_timer(&udev->timeout, tcmu_device_timedout, | |
1116 | (unsigned long)udev); | |
1117 | ||
b3af66e2 MC |
1118 | init_waitqueue_head(&udev->nl_cmd_wq); |
1119 | spin_lock_init(&udev->nl_cmd_lock); | |
1120 | ||
7c9e7a6f AG |
1121 | return &udev->se_dev; |
1122 | } | |
1123 | ||
1124 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
1125 | { | |
1126 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
1127 | ||
b6df4b79 | 1128 | mutex_lock(&tcmu_dev->cmdr_lock); |
7c9e7a6f | 1129 | tcmu_handle_completions(tcmu_dev); |
b6df4b79 | 1130 | mutex_unlock(&tcmu_dev->cmdr_lock); |
7c9e7a6f AG |
1131 | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1137 | * and this stuff must come along. | |
1138 | */ | |
1139 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1140 | { | |
1141 | struct tcmu_dev *udev = vma->vm_private_data; | |
1142 | struct uio_info *info = &udev->uio_info; | |
1143 | ||
1144 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1145 | if (info->mem[vma->vm_pgoff].size == 0) | |
1146 | return -1; | |
1147 | return (int)vma->vm_pgoff; | |
1148 | } | |
1149 | return -1; | |
1150 | } | |
1151 | ||
b6df4b79 XL |
1152 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1153 | { | |
1154 | struct page *page; | |
1155 | int ret; | |
1156 | ||
1157 | mutex_lock(&udev->cmdr_lock); | |
1158 | page = tcmu_get_block_page(udev, dbi); | |
1159 | if (likely(page)) { | |
1160 | mutex_unlock(&udev->cmdr_lock); | |
1161 | return page; | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Normally it shouldn't be here: | |
1166 | * Only when the userspace has touched the blocks which | |
1167 | * are out of the tcmu_cmd's data iov[], and will return | |
1168 | * one zeroed page. | |
1169 | */ | |
1170 | pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); | |
1171 | pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); | |
1172 | ||
1173 | if (dbi >= udev->dbi_thresh) { | |
1174 | /* Extern the udev->dbi_thresh to dbi + 1 */ | |
1175 | udev->dbi_thresh = dbi + 1; | |
1176 | udev->dbi_max = dbi; | |
1177 | } | |
1178 | ||
1179 | page = radix_tree_lookup(&udev->data_blocks, dbi); | |
1180 | if (!page) { | |
1181 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1182 | if (!page) { | |
1183 | mutex_unlock(&udev->cmdr_lock); | |
1184 | return NULL; | |
1185 | } | |
1186 | ||
1187 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
1188 | if (ret) { | |
1189 | mutex_unlock(&udev->cmdr_lock); | |
1190 | __free_page(page); | |
1191 | return NULL; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Since this case is rare in page fault routine, here we | |
1196 | * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS | |
1197 | * to reduce possible page fault call trace. | |
1198 | */ | |
1199 | atomic_inc(&global_db_count); | |
1200 | } | |
1201 | mutex_unlock(&udev->cmdr_lock); | |
1202 | ||
1203 | return page; | |
1204 | } | |
1205 | ||
11bac800 | 1206 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1207 | { |
11bac800 | 1208 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1209 | struct uio_info *info = &udev->uio_info; |
1210 | struct page *page; | |
1211 | unsigned long offset; | |
1212 | void *addr; | |
1213 | ||
11bac800 | 1214 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1215 | if (mi < 0) |
1216 | return VM_FAULT_SIGBUS; | |
1217 | ||
1218 | /* | |
1219 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1220 | * to use mem[N]. | |
1221 | */ | |
1222 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1223 | ||
141685a3 XL |
1224 | if (offset < udev->data_off) { |
1225 | /* For the vmalloc()ed cmd area pages */ | |
1226 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1227 | page = vmalloc_to_page(addr); |
141685a3 | 1228 | } else { |
141685a3 XL |
1229 | uint32_t dbi; |
1230 | ||
b6df4b79 | 1231 | /* For the dynamically growing data area pages */ |
141685a3 | 1232 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1233 | page = tcmu_try_get_block_page(udev, dbi); |
1234 | if (!page) | |
141685a3 | 1235 | return VM_FAULT_NOPAGE; |
141685a3 XL |
1236 | } |
1237 | ||
7c9e7a6f AG |
1238 | get_page(page); |
1239 | vmf->page = page; | |
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1244 | .fault = tcmu_vma_fault, | |
1245 | }; | |
1246 | ||
1247 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1248 | { | |
1249 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1250 | ||
1251 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1252 | vma->vm_ops = &tcmu_vm_ops; | |
1253 | ||
1254 | vma->vm_private_data = udev; | |
1255 | ||
1256 | /* Ensure the mmap is exactly the right size */ | |
1257 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1258 | return -EINVAL; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1264 | { | |
1265 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1266 | ||
1267 | /* O_EXCL not supported for char devs, so fake it? */ | |
1268 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1269 | return -EBUSY; | |
1270 | ||
b6df4b79 XL |
1271 | udev->inode = inode; |
1272 | ||
7c9e7a6f AG |
1273 | pr_debug("open\n"); |
1274 | ||
1275 | return 0; | |
1276 | } | |
1277 | ||
f3cdbe39 MC |
1278 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1279 | { | |
1280 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1281 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1282 | ||
1283 | kfree(udev->uio_info.name); | |
1284 | kfree(udev->name); | |
1285 | kfree(udev); | |
1286 | } | |
1287 | ||
1288 | static void tcmu_dev_kref_release(struct kref *kref) | |
1289 | { | |
1290 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1291 | struct se_device *dev = &udev->se_dev; | |
1292 | ||
1293 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1294 | } | |
1295 | ||
7c9e7a6f AG |
1296 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1297 | { | |
1298 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1299 | ||
1300 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1301 | ||
1302 | pr_debug("close\n"); | |
f3cdbe39 MC |
1303 | /* release ref from configure */ |
1304 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
1305 | return 0; |
1306 | } | |
1307 | ||
b3af66e2 MC |
1308 | static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
1309 | { | |
1310 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1311 | ||
1312 | if (!tcmu_kern_cmd_reply_supported) | |
1313 | return; | |
1314 | relock: | |
1315 | spin_lock(&udev->nl_cmd_lock); | |
1316 | ||
1317 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
1318 | spin_unlock(&udev->nl_cmd_lock); | |
1319 | pr_debug("sleeping for open nl cmd\n"); | |
1320 | wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); | |
1321 | goto relock; | |
1322 | } | |
1323 | ||
1324 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1325 | nl_cmd->cmd = cmd; | |
1326 | init_completion(&nl_cmd->complete); | |
1327 | ||
1328 | spin_unlock(&udev->nl_cmd_lock); | |
1329 | } | |
1330 | ||
1331 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) | |
1332 | { | |
1333 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1334 | int ret; | |
1335 | DEFINE_WAIT(__wait); | |
1336 | ||
1337 | if (!tcmu_kern_cmd_reply_supported) | |
1338 | return 0; | |
1339 | ||
1340 | pr_debug("sleeping for nl reply\n"); | |
1341 | wait_for_completion(&nl_cmd->complete); | |
1342 | ||
1343 | spin_lock(&udev->nl_cmd_lock); | |
1344 | nl_cmd->cmd = TCMU_CMD_UNSPEC; | |
1345 | ret = nl_cmd->status; | |
1346 | nl_cmd->status = 0; | |
1347 | spin_unlock(&udev->nl_cmd_lock); | |
1348 | ||
1349 | wake_up_all(&udev->nl_cmd_wq); | |
1350 | ||
1351 | return ret;; | |
1352 | } | |
1353 | ||
1354 | static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, | |
1355 | int reconfig_attr, const void *reconfig_data) | |
7c9e7a6f AG |
1356 | { |
1357 | struct sk_buff *skb; | |
1358 | void *msg_header; | |
6e14eab9 | 1359 | int ret = -ENOMEM; |
7c9e7a6f AG |
1360 | |
1361 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1362 | if (!skb) | |
6e14eab9 | 1363 | return ret; |
7c9e7a6f AG |
1364 | |
1365 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1366 | if (!msg_header) |
1367 | goto free_skb; | |
7c9e7a6f | 1368 | |
b3af66e2 | 1369 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1370 | if (ret < 0) |
1371 | goto free_skb; | |
7c9e7a6f | 1372 | |
b3af66e2 MC |
1373 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1374 | if (ret < 0) | |
1375 | goto free_skb; | |
1376 | ||
1377 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1378 | if (ret < 0) |
1379 | goto free_skb; | |
7c9e7a6f | 1380 | |
2d76443e MC |
1381 | if (cmd == TCMU_CMD_RECONFIG_DEVICE) { |
1382 | switch (reconfig_attr) { | |
1383 | case TCMU_ATTR_DEV_CFG: | |
1384 | ret = nla_put_string(skb, reconfig_attr, reconfig_data); | |
1385 | break; | |
1386 | case TCMU_ATTR_DEV_SIZE: | |
1387 | ret = nla_put_u64_64bit(skb, reconfig_attr, | |
1388 | *((u64 *)reconfig_data), | |
1389 | TCMU_ATTR_PAD); | |
1390 | break; | |
1391 | case TCMU_ATTR_WRITECACHE: | |
1392 | ret = nla_put_u8(skb, reconfig_attr, | |
1393 | *((u8 *)reconfig_data)); | |
1394 | break; | |
1395 | default: | |
1396 | BUG(); | |
1397 | } | |
1398 | ||
1399 | if (ret < 0) | |
1400 | goto free_skb; | |
1401 | } | |
8a45885c | 1402 | |
053c095a | 1403 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1404 | |
b3af66e2 MC |
1405 | tcmu_init_genl_cmd_reply(udev, cmd); |
1406 | ||
20c08b36 | 1407 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f | 1408 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
7c9e7a6f AG |
1409 | /* We don't care if no one is listening */ |
1410 | if (ret == -ESRCH) | |
1411 | ret = 0; | |
b3af66e2 MC |
1412 | if (!ret) |
1413 | ret = tcmu_wait_genl_cmd_reply(udev); | |
7c9e7a6f AG |
1414 | |
1415 | return ret; | |
6e14eab9 NB |
1416 | free_skb: |
1417 | nlmsg_free(skb); | |
1418 | return ret; | |
7c9e7a6f AG |
1419 | } |
1420 | ||
1421 | static int tcmu_configure_device(struct se_device *dev) | |
1422 | { | |
1423 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1424 | struct tcmu_hba *hba = udev->hba->hba_ptr; | |
1425 | struct uio_info *info; | |
1426 | struct tcmu_mailbox *mb; | |
1427 | size_t size; | |
1428 | size_t used; | |
1429 | int ret = 0; | |
1430 | char *str; | |
1431 | ||
1432 | info = &udev->uio_info; | |
1433 | ||
1434 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, | |
1435 | udev->dev_config); | |
1436 | size += 1; /* for \0 */ | |
1437 | str = kmalloc(size, GFP_KERNEL); | |
1438 | if (!str) | |
1439 | return -ENOMEM; | |
1440 | ||
1441 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
1442 | ||
1443 | if (udev->dev_config[0]) | |
1444 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1445 | ||
1446 | info->name = str; | |
1447 | ||
141685a3 | 1448 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1449 | if (!udev->mb_addr) { |
1450 | ret = -ENOMEM; | |
1451 | goto err_vzalloc; | |
1452 | } | |
1453 | ||
1454 | /* mailbox fits in first part of CMDR space */ | |
1455 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1456 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1457 | udev->data_size = DATA_SIZE; |
b6df4b79 XL |
1458 | udev->dbi_thresh = 0; /* Default in Idle state */ |
1459 | udev->waiting_global = false; | |
7c9e7a6f | 1460 | |
141685a3 | 1461 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1462 | mb = udev->mb_addr; |
0ad46af8 | 1463 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1464 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1465 | mb->cmdr_off = CMDR_OFF; |
1466 | mb->cmdr_size = udev->cmdr_size; | |
1467 | ||
1468 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1469 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1470 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1471 | |
b6df4b79 | 1472 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
141685a3 | 1473 | |
ac64a2ce | 1474 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1475 | |
1476 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1477 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1478 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1479 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1480 | |
1481 | info->irqcontrol = tcmu_irqcontrol; | |
1482 | info->irq = UIO_IRQ_CUSTOM; | |
1483 | ||
1484 | info->mmap = tcmu_mmap; | |
1485 | info->open = tcmu_open; | |
1486 | info->release = tcmu_release; | |
1487 | ||
1488 | ret = uio_register_device(tcmu_root_device, info); | |
1489 | if (ret) | |
1490 | goto err_register; | |
1491 | ||
81ee28de SY |
1492 | /* User can set hw_block_size before enable the device */ |
1493 | if (dev->dev_attrib.hw_block_size == 0) | |
1494 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1495 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1496 | if (!dev->dev_attrib.hw_max_sectors) |
1497 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
1498 | if (!dev->dev_attrib.emulate_write_cache) |
1499 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
1500 | dev->dev_attrib.hw_queue_depth = 128; |
1501 | ||
f3cdbe39 MC |
1502 | /* |
1503 | * Get a ref incase userspace does a close on the uio device before | |
1504 | * LIO has initiated tcmu_free_device. | |
1505 | */ | |
1506 | kref_get(&udev->kref); | |
1507 | ||
b3af66e2 | 1508 | ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); |
7c9e7a6f AG |
1509 | if (ret) |
1510 | goto err_netlink; | |
1511 | ||
b6df4b79 XL |
1512 | mutex_lock(&root_udev_mutex); |
1513 | list_add(&udev->node, &root_udev); | |
1514 | mutex_unlock(&root_udev_mutex); | |
1515 | ||
7c9e7a6f AG |
1516 | return 0; |
1517 | ||
1518 | err_netlink: | |
f3cdbe39 | 1519 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1520 | uio_unregister_device(&udev->uio_info); |
1521 | err_register: | |
1522 | vfree(udev->mb_addr); | |
1523 | err_vzalloc: | |
1524 | kfree(info->name); | |
f3cdbe39 | 1525 | info->name = NULL; |
7c9e7a6f AG |
1526 | |
1527 | return ret; | |
1528 | } | |
1529 | ||
b25c7863 | 1530 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
7c9e7a6f | 1531 | { |
b25c7863 SY |
1532 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { |
1533 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
7c9e7a6f | 1534 | return 0; |
b25c7863 | 1535 | } |
7c9e7a6f AG |
1536 | return -EINVAL; |
1537 | } | |
1538 | ||
972c7f16 MC |
1539 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1540 | { | |
1541 | return udev->uio_info.uio_dev ? true : false; | |
1542 | } | |
1543 | ||
b6df4b79 XL |
1544 | static void tcmu_blocks_release(struct tcmu_dev *udev) |
1545 | { | |
1546 | int i; | |
1547 | struct page *page; | |
1548 | ||
1549 | /* Try to release all block pages */ | |
1550 | mutex_lock(&udev->cmdr_lock); | |
1551 | for (i = 0; i <= udev->dbi_max; i++) { | |
1552 | page = radix_tree_delete(&udev->data_blocks, i); | |
1553 | if (page) { | |
1554 | __free_page(page); | |
1555 | atomic_dec(&global_db_count); | |
1556 | } | |
1557 | } | |
1558 | mutex_unlock(&udev->cmdr_lock); | |
1559 | } | |
1560 | ||
7c9e7a6f | 1561 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
1562 | { |
1563 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1564 | ||
1565 | /* release ref from init */ | |
1566 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1567 | } | |
1568 | ||
1569 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
1570 | { |
1571 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
b25c7863 SY |
1572 | struct tcmu_cmd *cmd; |
1573 | bool all_expired = true; | |
7c9e7a6f AG |
1574 | int i; |
1575 | ||
1576 | del_timer_sync(&udev->timeout); | |
1577 | ||
b6df4b79 XL |
1578 | mutex_lock(&root_udev_mutex); |
1579 | list_del(&udev->node); | |
1580 | mutex_unlock(&root_udev_mutex); | |
1581 | ||
7c9e7a6f AG |
1582 | vfree(udev->mb_addr); |
1583 | ||
1584 | /* Upper layer should drain all requests before calling this */ | |
1585 | spin_lock_irq(&udev->commands_lock); | |
b25c7863 SY |
1586 | idr_for_each_entry(&udev->commands, cmd, i) { |
1587 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1588 | all_expired = false; | |
1589 | } | |
7c9e7a6f AG |
1590 | idr_destroy(&udev->commands); |
1591 | spin_unlock_irq(&udev->commands_lock); | |
b25c7863 | 1592 | WARN_ON(!all_expired); |
7c9e7a6f | 1593 | |
b6df4b79 | 1594 | tcmu_blocks_release(udev); |
141685a3 | 1595 | |
531283ff | 1596 | tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); |
7c9e7a6f | 1597 | |
531283ff | 1598 | uio_unregister_device(&udev->uio_info); |
7c9e7a6f AG |
1599 | } |
1600 | ||
1601 | enum { | |
3abaa2bf | 1602 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
7d7a7435 | 1603 | Opt_err, |
7c9e7a6f AG |
1604 | }; |
1605 | ||
1606 | static match_table_t tokens = { | |
1607 | {Opt_dev_config, "dev_config=%s"}, | |
1608 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1609 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1610 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
7c9e7a6f AG |
1611 | {Opt_err, NULL} |
1612 | }; | |
1613 | ||
3abaa2bf MC |
1614 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1615 | { | |
1616 | unsigned long tmp_ul; | |
1617 | char *arg_p; | |
1618 | int ret; | |
1619 | ||
1620 | arg_p = match_strdup(arg); | |
1621 | if (!arg_p) | |
1622 | return -ENOMEM; | |
1623 | ||
1624 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1625 | kfree(arg_p); | |
1626 | if (ret < 0) { | |
1627 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1628 | return ret; | |
1629 | } | |
1630 | if (!tmp_ul) { | |
1631 | pr_err("dev attrib must be nonzero\n"); | |
1632 | return -EINVAL; | |
1633 | } | |
1634 | *dev_attrib = tmp_ul; | |
1635 | return 0; | |
1636 | } | |
1637 | ||
7c9e7a6f AG |
1638 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1639 | const char *page, ssize_t count) | |
1640 | { | |
1641 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1642 | char *orig, *ptr, *opts, *arg_p; | |
1643 | substring_t args[MAX_OPT_ARGS]; | |
1644 | int ret = 0, token; | |
7c9e7a6f AG |
1645 | |
1646 | opts = kstrdup(page, GFP_KERNEL); | |
1647 | if (!opts) | |
1648 | return -ENOMEM; | |
1649 | ||
1650 | orig = opts; | |
1651 | ||
1652 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1653 | if (!*ptr) | |
1654 | continue; | |
1655 | ||
1656 | token = match_token(ptr, tokens, args); | |
1657 | switch (token) { | |
1658 | case Opt_dev_config: | |
1659 | if (match_strlcpy(udev->dev_config, &args[0], | |
1660 | TCMU_CONFIG_LEN) == 0) { | |
1661 | ret = -EINVAL; | |
1662 | break; | |
1663 | } | |
1664 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1665 | break; | |
1666 | case Opt_dev_size: | |
1667 | arg_p = match_strdup(&args[0]); | |
1668 | if (!arg_p) { | |
1669 | ret = -ENOMEM; | |
1670 | break; | |
1671 | } | |
1672 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1673 | kfree(arg_p); | |
1674 | if (ret < 0) | |
1675 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1676 | break; | |
9c1cd1b6 | 1677 | case Opt_hw_block_size: |
3abaa2bf MC |
1678 | ret = tcmu_set_dev_attrib(&args[0], |
1679 | &(dev->dev_attrib.hw_block_size)); | |
1680 | break; | |
1681 | case Opt_hw_max_sectors: | |
1682 | ret = tcmu_set_dev_attrib(&args[0], | |
1683 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1684 | break; |
7c9e7a6f AG |
1685 | default: |
1686 | break; | |
1687 | } | |
2579325c MC |
1688 | |
1689 | if (ret) | |
1690 | break; | |
7c9e7a6f AG |
1691 | } |
1692 | ||
1693 | kfree(orig); | |
1694 | return (!ret) ? count : ret; | |
1695 | } | |
1696 | ||
1697 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1698 | { | |
1699 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1700 | ssize_t bl = 0; | |
1701 | ||
1702 | bl = sprintf(b + bl, "Config: %s ", | |
1703 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1704 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1705 | |
1706 | return bl; | |
1707 | } | |
1708 | ||
1709 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1710 | { | |
1711 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1712 | ||
1713 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1714 | dev->dev_attrib.block_size); | |
1715 | } | |
1716 | ||
7c9e7a6f | 1717 | static sense_reason_t |
9c1cd1b6 | 1718 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1719 | { |
02eb924f | 1720 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1721 | } |
1722 | ||
7d7a7435 NB |
1723 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1724 | { | |
1725 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1726 | struct se_dev_attrib, da_group); | |
1727 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1728 | struct tcmu_dev, se_dev); | |
1729 | ||
1730 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1731 | } | |
1732 | ||
1733 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1734 | size_t count) | |
1735 | { | |
1736 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1737 | struct se_dev_attrib, da_group); | |
1738 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1739 | struct tcmu_dev, se_dev); | |
1740 | u32 val; | |
1741 | int ret; | |
1742 | ||
1743 | if (da->da_dev->export_count) { | |
1744 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1745 | return -EINVAL; | |
1746 | } | |
1747 | ||
1748 | ret = kstrtou32(page, 0, &val); | |
1749 | if (ret < 0) | |
1750 | return ret; | |
1751 | ||
7d7a7435 NB |
1752 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1753 | return count; | |
1754 | } | |
1755 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1756 | ||
2d76443e | 1757 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
1758 | { |
1759 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1760 | struct se_dev_attrib, da_group); | |
1761 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1762 | ||
1763 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
1764 | } | |
1765 | ||
2d76443e MC |
1766 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
1767 | size_t count) | |
ee018252 BL |
1768 | { |
1769 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1770 | struct se_dev_attrib, da_group); | |
1771 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1772 | int ret, len; |
ee018252 | 1773 | |
2d76443e MC |
1774 | len = strlen(page); |
1775 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 1776 | return -EINVAL; |
ee018252 BL |
1777 | |
1778 | /* Check if device has been configured before */ | |
1779 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1780 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1781 | TCMU_ATTR_DEV_CFG, page); |
ee018252 BL |
1782 | if (ret) { |
1783 | pr_err("Unable to reconfigure device\n"); | |
1784 | return ret; | |
1785 | } | |
1786 | } | |
2d76443e | 1787 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
1788 | |
1789 | return count; | |
1790 | } | |
2d76443e | 1791 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 1792 | |
801fc54d BL |
1793 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
1794 | { | |
1795 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1796 | struct se_dev_attrib, da_group); | |
1797 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1798 | ||
1799 | return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); | |
1800 | } | |
1801 | ||
1802 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, | |
1803 | size_t count) | |
1804 | { | |
1805 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1806 | struct se_dev_attrib, da_group); | |
1807 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1808 | u64 val; |
801fc54d BL |
1809 | int ret; |
1810 | ||
2d76443e | 1811 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
1812 | if (ret < 0) |
1813 | return ret; | |
801fc54d BL |
1814 | |
1815 | /* Check if device has been configured before */ | |
1816 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1817 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1818 | TCMU_ATTR_DEV_SIZE, &val); |
801fc54d BL |
1819 | if (ret) { |
1820 | pr_err("Unable to reconfigure device\n"); | |
1821 | return ret; | |
1822 | } | |
1823 | } | |
2d76443e | 1824 | udev->dev_size = val; |
801fc54d BL |
1825 | return count; |
1826 | } | |
1827 | CONFIGFS_ATTR(tcmu_, dev_size); | |
1828 | ||
9a8bb606 BL |
1829 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
1830 | char *page) | |
1831 | { | |
1832 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1833 | struct se_dev_attrib, da_group); | |
1834 | ||
1835 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
1836 | } | |
1837 | ||
1838 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, | |
1839 | const char *page, size_t count) | |
1840 | { | |
1841 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1842 | struct se_dev_attrib, da_group); | |
1068be7b | 1843 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 1844 | u8 val; |
9a8bb606 BL |
1845 | int ret; |
1846 | ||
2d76443e | 1847 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
1848 | if (ret < 0) |
1849 | return ret; | |
1850 | ||
1068be7b BL |
1851 | /* Check if device has been configured before */ |
1852 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1853 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1854 | TCMU_ATTR_WRITECACHE, &val); |
1068be7b BL |
1855 | if (ret) { |
1856 | pr_err("Unable to reconfigure device\n"); | |
1857 | return ret; | |
1858 | } | |
1859 | } | |
2d76443e MC |
1860 | |
1861 | da->emulate_write_cache = val; | |
9a8bb606 BL |
1862 | return count; |
1863 | } | |
1864 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
1865 | ||
5821783b | 1866 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 1867 | &tcmu_attr_cmd_time_out, |
2d76443e | 1868 | &tcmu_attr_dev_config, |
801fc54d BL |
1869 | &tcmu_attr_dev_size, |
1870 | &tcmu_attr_emulate_write_cache, | |
1871 | NULL, | |
1872 | }; | |
1873 | ||
7d7a7435 NB |
1874 | static struct configfs_attribute **tcmu_attrs; |
1875 | ||
1876 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1877 | .name = "user", |
7c9e7a6f | 1878 | .owner = THIS_MODULE, |
a3541703 | 1879 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1880 | .attach_hba = tcmu_attach_hba, |
1881 | .detach_hba = tcmu_detach_hba, | |
1882 | .alloc_device = tcmu_alloc_device, | |
1883 | .configure_device = tcmu_configure_device, | |
92634706 | 1884 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
1885 | .free_device = tcmu_free_device, |
1886 | .parse_cdb = tcmu_parse_cdb, | |
1887 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1888 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1889 | .get_device_type = sbc_get_device_type, | |
1890 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1891 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1892 | }; |
1893 | ||
b6df4b79 XL |
1894 | static int unmap_thread_fn(void *data) |
1895 | { | |
1896 | struct tcmu_dev *udev; | |
1897 | loff_t off; | |
1898 | uint32_t start, end, block; | |
1899 | struct page *page; | |
1900 | int i; | |
1901 | ||
07932a02 | 1902 | while (!kthread_should_stop()) { |
b6df4b79 XL |
1903 | DEFINE_WAIT(__wait); |
1904 | ||
1905 | prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); | |
1906 | schedule(); | |
1907 | finish_wait(&unmap_wait, &__wait); | |
1908 | ||
d906d8af MC |
1909 | if (kthread_should_stop()) |
1910 | break; | |
1911 | ||
b6df4b79 XL |
1912 | mutex_lock(&root_udev_mutex); |
1913 | list_for_each_entry(udev, &root_udev, node) { | |
1914 | mutex_lock(&udev->cmdr_lock); | |
1915 | ||
1916 | /* Try to complete the finished commands first */ | |
1917 | tcmu_handle_completions(udev); | |
1918 | ||
1919 | /* Skip the udevs waiting the global pool or in idle */ | |
1920 | if (udev->waiting_global || !udev->dbi_thresh) { | |
1921 | mutex_unlock(&udev->cmdr_lock); | |
1922 | continue; | |
1923 | } | |
1924 | ||
1925 | end = udev->dbi_max + 1; | |
1926 | block = find_last_bit(udev->data_bitmap, end); | |
1927 | if (block == udev->dbi_max) { | |
1928 | /* | |
1929 | * The last bit is dbi_max, so there is | |
1930 | * no need to shrink any blocks. | |
1931 | */ | |
1932 | mutex_unlock(&udev->cmdr_lock); | |
1933 | continue; | |
1934 | } else if (block == end) { | |
1935 | /* The current udev will goto idle state */ | |
1936 | udev->dbi_thresh = start = 0; | |
1937 | udev->dbi_max = 0; | |
1938 | } else { | |
1939 | udev->dbi_thresh = start = block + 1; | |
1940 | udev->dbi_max = block; | |
1941 | } | |
1942 | ||
1943 | /* Here will truncate the data area from off */ | |
1944 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
1945 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
1946 | ||
1947 | /* Release the block pages */ | |
1948 | for (i = start; i < end; i++) { | |
1949 | page = radix_tree_delete(&udev->data_blocks, i); | |
1950 | if (page) { | |
1951 | __free_page(page); | |
1952 | atomic_dec(&global_db_count); | |
1953 | } | |
1954 | } | |
1955 | mutex_unlock(&udev->cmdr_lock); | |
1956 | } | |
1957 | ||
1958 | /* | |
1959 | * Try to wake up the udevs who are waiting | |
1960 | * for the global data pool. | |
1961 | */ | |
1962 | list_for_each_entry(udev, &root_udev, node) { | |
1963 | if (udev->waiting_global) | |
1964 | wake_up(&udev->wait_cmdr); | |
1965 | } | |
1966 | mutex_unlock(&root_udev_mutex); | |
1967 | } | |
1968 | ||
1969 | return 0; | |
1970 | } | |
1971 | ||
7c9e7a6f AG |
1972 | static int __init tcmu_module_init(void) |
1973 | { | |
801fc54d | 1974 | int ret, i, k, len = 0; |
7c9e7a6f AG |
1975 | |
1976 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
1977 | ||
1978 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
1979 | sizeof(struct tcmu_cmd), | |
1980 | __alignof__(struct tcmu_cmd), | |
1981 | 0, NULL); | |
1982 | if (!tcmu_cmd_cache) | |
1983 | return -ENOMEM; | |
1984 | ||
1985 | tcmu_root_device = root_device_register("tcm_user"); | |
1986 | if (IS_ERR(tcmu_root_device)) { | |
1987 | ret = PTR_ERR(tcmu_root_device); | |
1988 | goto out_free_cache; | |
1989 | } | |
1990 | ||
1991 | ret = genl_register_family(&tcmu_genl_family); | |
1992 | if (ret < 0) { | |
1993 | goto out_unreg_device; | |
1994 | } | |
1995 | ||
7d7a7435 NB |
1996 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
1997 | len += sizeof(struct configfs_attribute *); | |
1998 | } | |
801fc54d BL |
1999 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { |
2000 | len += sizeof(struct configfs_attribute *); | |
2001 | } | |
2002 | len += sizeof(struct configfs_attribute *); | |
7d7a7435 NB |
2003 | |
2004 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
2005 | if (!tcmu_attrs) { | |
2006 | ret = -ENOMEM; | |
2007 | goto out_unreg_genl; | |
2008 | } | |
2009 | ||
2010 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
2011 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
2012 | } | |
801fc54d BL |
2013 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { |
2014 | tcmu_attrs[i] = tcmu_attrib_attrs[k]; | |
2015 | i++; | |
2016 | } | |
7d7a7435 NB |
2017 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
2018 | ||
0a06d430 | 2019 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 2020 | if (ret) |
7d7a7435 | 2021 | goto out_attrs; |
7c9e7a6f | 2022 | |
b6df4b79 XL |
2023 | init_waitqueue_head(&unmap_wait); |
2024 | unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); | |
2025 | if (IS_ERR(unmap_thread)) { | |
2026 | ret = PTR_ERR(unmap_thread); | |
2027 | goto out_unreg_transport; | |
2028 | } | |
2029 | ||
7c9e7a6f AG |
2030 | return 0; |
2031 | ||
b6df4b79 XL |
2032 | out_unreg_transport: |
2033 | target_backend_unregister(&tcmu_ops); | |
7d7a7435 NB |
2034 | out_attrs: |
2035 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
2036 | out_unreg_genl: |
2037 | genl_unregister_family(&tcmu_genl_family); | |
2038 | out_unreg_device: | |
2039 | root_device_unregister(tcmu_root_device); | |
2040 | out_free_cache: | |
2041 | kmem_cache_destroy(tcmu_cmd_cache); | |
2042 | ||
2043 | return ret; | |
2044 | } | |
2045 | ||
2046 | static void __exit tcmu_module_exit(void) | |
2047 | { | |
b6df4b79 | 2048 | kthread_stop(unmap_thread); |
0a06d430 | 2049 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 2050 | kfree(tcmu_attrs); |
7c9e7a6f AG |
2051 | genl_unregister_family(&tcmu_genl_family); |
2052 | root_device_unregister(tcmu_root_device); | |
2053 | kmem_cache_destroy(tcmu_cmd_cache); | |
2054 | } | |
2055 | ||
2056 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
2057 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
2058 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
2059 | MODULE_LICENSE("GPL"); | |
2060 | ||
2061 | module_init(tcmu_module_init); | |
2062 | module_exit(tcmu_module_exit); |