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Commit | Line | Data |
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7c9e7a6f AG |
1 | /* |
2 | * Copyright (C) 2013 Shaohua Li <shli@kernel.org> | |
3 | * Copyright (C) 2014 Red Hat, Inc. | |
f97ec7db | 4 | * Copyright (C) 2015 Arrikto, Inc. |
141685a3 | 5 | * Copyright (C) 2017 Chinamobile, Inc. |
7c9e7a6f AG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/spinlock.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/idr.h> | |
ba929992 | 24 | #include <linux/kernel.h> |
7c9e7a6f AG |
25 | #include <linux/timer.h> |
26 | #include <linux/parser.h> | |
5538d294 | 27 | #include <linux/vmalloc.h> |
7c9e7a6f | 28 | #include <linux/uio_driver.h> |
141685a3 | 29 | #include <linux/radix-tree.h> |
ac64a2ce | 30 | #include <linux/stringify.h> |
26418649 | 31 | #include <linux/bitops.h> |
f5045724 | 32 | #include <linux/highmem.h> |
7d7a7435 | 33 | #include <linux/configfs.h> |
b6df4b79 XL |
34 | #include <linux/mutex.h> |
35 | #include <linux/kthread.h> | |
7c9e7a6f | 36 | #include <net/genetlink.h> |
ba929992 BVA |
37 | #include <scsi/scsi_common.h> |
38 | #include <scsi/scsi_proto.h> | |
7c9e7a6f AG |
39 | #include <target/target_core_base.h> |
40 | #include <target/target_core_fabric.h> | |
41 | #include <target/target_core_backend.h> | |
e9f720d6 | 42 | |
7c9e7a6f AG |
43 | #include <linux/target_core_user.h> |
44 | ||
45 | /* | |
46 | * Define a shared-memory interface for LIO to pass SCSI commands and | |
47 | * data to userspace for processing. This is to allow backends that | |
48 | * are too complex for in-kernel support to be possible. | |
49 | * | |
50 | * It uses the UIO framework to do a lot of the device-creation and | |
51 | * introspection work for us. | |
52 | * | |
53 | * See the .h file for how the ring is laid out. Note that while the | |
54 | * command ring is defined, the particulars of the data area are | |
55 | * not. Offset values in the command entry point to other locations | |
56 | * internal to the mmap()ed area. There is separate space outside the | |
57 | * command ring for data buffers. This leaves maximum flexibility for | |
58 | * moving buffer allocations, or even page flipping or other | |
59 | * allocation techniques, without altering the command ring layout. | |
60 | * | |
61 | * SECURITY: | |
62 | * The user process must be assumed to be malicious. There's no way to | |
63 | * prevent it breaking the command ring protocol if it wants, but in | |
64 | * order to prevent other issues we must only ever read *data* from | |
65 | * the shared memory area, not offsets or sizes. This applies to | |
66 | * command ring entries as well as the mailbox. Extra code needed for | |
67 | * this may have a 'UAM' comment. | |
68 | */ | |
69 | ||
7c9e7a6f AG |
70 | #define TCMU_TIME_OUT (30 * MSEC_PER_SEC) |
71 | ||
b6df4b79 XL |
72 | /* For cmd area, the size is fixed 8MB */ |
73 | #define CMDR_SIZE (8 * 1024 * 1024) | |
26418649 | 74 | |
b6df4b79 XL |
75 | /* |
76 | * For data area, the block size is PAGE_SIZE and | |
77 | * the total size is 256K * PAGE_SIZE. | |
78 | */ | |
79 | #define DATA_BLOCK_SIZE PAGE_SIZE | |
80 | #define DATA_BLOCK_BITS (256 * 1024) | |
26418649 | 81 | #define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE) |
b6df4b79 | 82 | #define DATA_BLOCK_INIT_BITS 128 |
7c9e7a6f | 83 | |
b6df4b79 | 84 | /* The total size of the ring is 8M + 256K * PAGE_SIZE */ |
7c9e7a6f AG |
85 | #define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE) |
86 | ||
b6df4b79 XL |
87 | /* Default maximum of the global data blocks(512K * PAGE_SIZE) */ |
88 | #define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024) | |
89 | ||
b3af66e2 MC |
90 | static u8 tcmu_kern_cmd_reply_supported; |
91 | ||
7c9e7a6f AG |
92 | static struct device *tcmu_root_device; |
93 | ||
94 | struct tcmu_hba { | |
95 | u32 host_id; | |
96 | }; | |
97 | ||
7c9e7a6f AG |
98 | #define TCMU_CONFIG_LEN 256 |
99 | ||
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 | 152 | char dev_config[TCMU_CONFIG_LEN]; |
b849b456 KN |
153 | |
154 | int nl_reply_supported; | |
7c9e7a6f AG |
155 | }; |
156 | ||
157 | #define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev) | |
158 | ||
159 | #define CMDR_OFF sizeof(struct tcmu_mailbox) | |
160 | ||
161 | struct tcmu_cmd { | |
162 | struct se_cmd *se_cmd; | |
163 | struct tcmu_dev *tcmu_dev; | |
164 | ||
165 | uint16_t cmd_id; | |
166 | ||
26418649 | 167 | /* Can't use se_cmd when cleaning up expired cmds, because if |
7c9e7a6f | 168 | cmd has been completed then accessing se_cmd is off limits */ |
141685a3 XL |
169 | uint32_t dbi_cnt; |
170 | uint32_t dbi_cur; | |
171 | uint32_t *dbi; | |
7c9e7a6f AG |
172 | |
173 | unsigned long deadline; | |
174 | ||
175 | #define TCMU_CMD_BIT_EXPIRED 0 | |
176 | unsigned long flags; | |
177 | }; | |
178 | ||
b6df4b79 XL |
179 | static struct task_struct *unmap_thread; |
180 | static wait_queue_head_t unmap_wait; | |
181 | static DEFINE_MUTEX(root_udev_mutex); | |
182 | static LIST_HEAD(root_udev); | |
183 | ||
184 | static atomic_t global_db_count = ATOMIC_INIT(0); | |
185 | ||
7c9e7a6f AG |
186 | static struct kmem_cache *tcmu_cmd_cache; |
187 | ||
188 | /* multicast group */ | |
189 | enum tcmu_multicast_groups { | |
190 | TCMU_MCGRP_CONFIG, | |
191 | }; | |
192 | ||
193 | static const struct genl_multicast_group tcmu_mcgrps[] = { | |
194 | [TCMU_MCGRP_CONFIG] = { .name = "config", }, | |
195 | }; | |
196 | ||
b3af66e2 MC |
197 | static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = { |
198 | [TCMU_ATTR_DEVICE] = { .type = NLA_STRING }, | |
199 | [TCMU_ATTR_MINOR] = { .type = NLA_U32 }, | |
200 | [TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 }, | |
201 | [TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 }, | |
202 | [TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 }, | |
203 | }; | |
204 | ||
205 | static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd) | |
206 | { | |
207 | struct se_device *dev; | |
208 | struct tcmu_dev *udev; | |
209 | struct tcmu_nl_cmd *nl_cmd; | |
210 | int dev_id, rc, ret = 0; | |
211 | bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE); | |
212 | ||
213 | if (!info->attrs[TCMU_ATTR_CMD_STATUS] || | |
214 | !info->attrs[TCMU_ATTR_DEVICE_ID]) { | |
215 | printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n"); | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]); | |
220 | rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]); | |
221 | ||
222 | dev = target_find_device(dev_id, !is_removed); | |
223 | if (!dev) { | |
224 | printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n", | |
225 | completed_cmd, rc, dev_id); | |
226 | return -ENODEV; | |
227 | } | |
228 | udev = TCMU_DEV(dev); | |
229 | ||
230 | spin_lock(&udev->nl_cmd_lock); | |
231 | nl_cmd = &udev->curr_nl_cmd; | |
232 | ||
233 | pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id, | |
234 | nl_cmd->cmd, completed_cmd, rc); | |
235 | ||
236 | if (nl_cmd->cmd != completed_cmd) { | |
237 | printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n", | |
238 | completed_cmd, nl_cmd->cmd); | |
239 | ret = -EINVAL; | |
240 | } else { | |
241 | nl_cmd->status = rc; | |
242 | } | |
243 | ||
244 | spin_unlock(&udev->nl_cmd_lock); | |
245 | if (!is_removed) | |
246 | target_undepend_item(&dev->dev_group.cg_item); | |
247 | if (!ret) | |
248 | complete(&nl_cmd->complete); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info) | |
253 | { | |
254 | return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE); | |
255 | } | |
256 | ||
257 | static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info) | |
258 | { | |
259 | return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE); | |
260 | } | |
261 | ||
262 | static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb, | |
263 | struct genl_info *info) | |
264 | { | |
265 | return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE); | |
266 | } | |
267 | ||
268 | static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info) | |
269 | { | |
270 | if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) { | |
271 | tcmu_kern_cmd_reply_supported = | |
272 | nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]); | |
273 | printk(KERN_INFO "tcmu daemon: command reply support %u.\n", | |
274 | tcmu_kern_cmd_reply_supported); | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static const struct genl_ops tcmu_genl_ops[] = { | |
281 | { | |
282 | .cmd = TCMU_CMD_SET_FEATURES, | |
283 | .flags = GENL_ADMIN_PERM, | |
284 | .policy = tcmu_attr_policy, | |
285 | .doit = tcmu_genl_set_features, | |
286 | }, | |
287 | { | |
288 | .cmd = TCMU_CMD_ADDED_DEVICE_DONE, | |
289 | .flags = GENL_ADMIN_PERM, | |
290 | .policy = tcmu_attr_policy, | |
291 | .doit = tcmu_genl_add_dev_done, | |
292 | }, | |
293 | { | |
294 | .cmd = TCMU_CMD_REMOVED_DEVICE_DONE, | |
295 | .flags = GENL_ADMIN_PERM, | |
296 | .policy = tcmu_attr_policy, | |
297 | .doit = tcmu_genl_rm_dev_done, | |
298 | }, | |
299 | { | |
300 | .cmd = TCMU_CMD_RECONFIG_DEVICE_DONE, | |
301 | .flags = GENL_ADMIN_PERM, | |
302 | .policy = tcmu_attr_policy, | |
303 | .doit = tcmu_genl_reconfig_dev_done, | |
304 | }, | |
305 | }; | |
306 | ||
7c9e7a6f | 307 | /* Our generic netlink family */ |
56989f6d | 308 | static struct genl_family tcmu_genl_family __ro_after_init = { |
489111e5 | 309 | .module = THIS_MODULE, |
7c9e7a6f AG |
310 | .hdrsize = 0, |
311 | .name = "TCM-USER", | |
b3af66e2 | 312 | .version = 2, |
7c9e7a6f AG |
313 | .maxattr = TCMU_ATTR_MAX, |
314 | .mcgrps = tcmu_mcgrps, | |
315 | .n_mcgrps = ARRAY_SIZE(tcmu_mcgrps), | |
20c08b36 | 316 | .netnsok = true, |
b3af66e2 MC |
317 | .ops = tcmu_genl_ops, |
318 | .n_ops = ARRAY_SIZE(tcmu_genl_ops), | |
7c9e7a6f AG |
319 | }; |
320 | ||
141685a3 XL |
321 | #define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index)) |
322 | #define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0) | |
323 | #define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index)) | |
324 | #define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++]) | |
325 | ||
b6df4b79 | 326 | static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len) |
141685a3 XL |
327 | { |
328 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
329 | uint32_t i; | |
330 | ||
b6df4b79 | 331 | for (i = 0; i < len; i++) |
141685a3 XL |
332 | clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap); |
333 | } | |
334 | ||
b6df4b79 XL |
335 | static inline bool tcmu_get_empty_block(struct tcmu_dev *udev, |
336 | struct tcmu_cmd *tcmu_cmd) | |
141685a3 | 337 | { |
b6df4b79 XL |
338 | struct page *page; |
339 | int ret, dbi; | |
141685a3 | 340 | |
b6df4b79 XL |
341 | dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); |
342 | if (dbi == udev->dbi_thresh) | |
343 | return false; | |
141685a3 | 344 | |
b6df4b79 XL |
345 | page = radix_tree_lookup(&udev->data_blocks, dbi); |
346 | if (!page) { | |
b6df4b79 XL |
347 | if (atomic_add_return(1, &global_db_count) > |
348 | TCMU_GLOBAL_MAX_BLOCKS) { | |
349 | atomic_dec(&global_db_count); | |
350 | return false; | |
141685a3 XL |
351 | } |
352 | ||
b6df4b79 XL |
353 | /* try to get new page from the mm */ |
354 | page = alloc_page(GFP_KERNEL); | |
355 | if (!page) | |
daf78c30 | 356 | goto err_alloc; |
b6df4b79 XL |
357 | |
358 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
daf78c30 XL |
359 | if (ret) |
360 | goto err_insert; | |
141685a3 XL |
361 | } |
362 | ||
b6df4b79 XL |
363 | if (dbi > udev->dbi_max) |
364 | udev->dbi_max = dbi; | |
365 | ||
366 | set_bit(dbi, udev->data_bitmap); | |
367 | tcmu_cmd_set_dbi(tcmu_cmd, dbi); | |
368 | ||
369 | return true; | |
daf78c30 XL |
370 | err_insert: |
371 | __free_page(page); | |
372 | err_alloc: | |
373 | atomic_dec(&global_db_count); | |
374 | return false; | |
141685a3 XL |
375 | } |
376 | ||
b6df4b79 XL |
377 | static bool tcmu_get_empty_blocks(struct tcmu_dev *udev, |
378 | struct tcmu_cmd *tcmu_cmd) | |
379 | { | |
380 | int i; | |
381 | ||
382 | udev->waiting_global = false; | |
383 | ||
384 | for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) { | |
385 | if (!tcmu_get_empty_block(udev, tcmu_cmd)) | |
386 | goto err; | |
387 | } | |
388 | return true; | |
389 | ||
390 | err: | |
391 | udev->waiting_global = true; | |
392 | /* Try to wake up the unmap thread */ | |
393 | wake_up(&unmap_wait); | |
394 | return false; | |
395 | } | |
396 | ||
397 | static inline struct page * | |
398 | tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) | |
141685a3 XL |
399 | { |
400 | return radix_tree_lookup(&udev->data_blocks, dbi); | |
401 | } | |
402 | ||
403 | static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) | |
404 | { | |
405 | kfree(tcmu_cmd->dbi); | |
406 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
407 | } | |
408 | ||
409 | static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) | |
410 | { | |
411 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
412 | size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE); | |
413 | ||
414 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
415 | BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents)); | |
416 | data_length += round_up(se_cmd->t_bidi_data_sg->length, | |
417 | DATA_BLOCK_SIZE); | |
418 | } | |
419 | ||
420 | return data_length; | |
421 | } | |
422 | ||
423 | static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) | |
424 | { | |
425 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); | |
426 | ||
427 | return data_length / DATA_BLOCK_SIZE; | |
428 | } | |
429 | ||
7c9e7a6f AG |
430 | static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd) |
431 | { | |
432 | struct se_device *se_dev = se_cmd->se_dev; | |
433 | struct tcmu_dev *udev = TCMU_DEV(se_dev); | |
434 | struct tcmu_cmd *tcmu_cmd; | |
7c9e7a6f AG |
435 | |
436 | tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL); | |
437 | if (!tcmu_cmd) | |
438 | return NULL; | |
439 | ||
440 | tcmu_cmd->se_cmd = se_cmd; | |
441 | tcmu_cmd->tcmu_dev = udev; | |
7c9e7a6f | 442 | |
141685a3 XL |
443 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
444 | tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd); | |
445 | tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t), | |
446 | GFP_KERNEL); | |
447 | if (!tcmu_cmd->dbi) { | |
448 | kmem_cache_free(tcmu_cmd_cache, tcmu_cmd); | |
449 | return NULL; | |
450 | } | |
451 | ||
7c9e7a6f AG |
452 | return tcmu_cmd; |
453 | } | |
454 | ||
455 | static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) | |
456 | { | |
b75d8063 | 457 | unsigned long offset = offset_in_page(vaddr); |
7c9e7a6f AG |
458 | |
459 | size = round_up(size+offset, PAGE_SIZE); | |
460 | vaddr -= offset; | |
461 | ||
462 | while (size) { | |
463 | flush_dcache_page(virt_to_page(vaddr)); | |
464 | size -= PAGE_SIZE; | |
465 | } | |
466 | } | |
467 | ||
468 | /* | |
469 | * Some ring helper functions. We don't assume size is a power of 2 so | |
470 | * we can't use circ_buf.h. | |
471 | */ | |
472 | static inline size_t spc_used(size_t head, size_t tail, size_t size) | |
473 | { | |
474 | int diff = head - tail; | |
475 | ||
476 | if (diff >= 0) | |
477 | return diff; | |
478 | else | |
479 | return size + diff; | |
480 | } | |
481 | ||
482 | static inline size_t spc_free(size_t head, size_t tail, size_t size) | |
483 | { | |
484 | /* Keep 1 byte unused or we can't tell full from empty */ | |
485 | return (size - spc_used(head, tail, size) - 1); | |
486 | } | |
487 | ||
488 | static inline size_t head_to_end(size_t head, size_t size) | |
489 | { | |
490 | return size - head; | |
491 | } | |
492 | ||
f1dbd087 SY |
493 | static inline void new_iov(struct iovec **iov, int *iov_cnt, |
494 | struct tcmu_dev *udev) | |
495 | { | |
496 | struct iovec *iovec; | |
497 | ||
498 | if (*iov_cnt != 0) | |
499 | (*iov)++; | |
500 | (*iov_cnt)++; | |
501 | ||
502 | iovec = *iov; | |
503 | memset(iovec, 0, sizeof(struct iovec)); | |
f1dbd087 SY |
504 | } |
505 | ||
7c9e7a6f AG |
506 | #define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size) |
507 | ||
26418649 | 508 | /* offset is relative to mb_addr */ |
141685a3 XL |
509 | static inline size_t get_block_offset_user(struct tcmu_dev *dev, |
510 | int dbi, int remaining) | |
26418649 | 511 | { |
141685a3 | 512 | return dev->data_off + dbi * DATA_BLOCK_SIZE + |
26418649 SY |
513 | DATA_BLOCK_SIZE - remaining; |
514 | } | |
515 | ||
daf78c30 | 516 | static inline size_t iov_tail(struct iovec *iov) |
26418649 SY |
517 | { |
518 | return (size_t)iov->iov_base + iov->iov_len; | |
519 | } | |
520 | ||
b6df4b79 | 521 | static int scatter_data_area(struct tcmu_dev *udev, |
141685a3 XL |
522 | struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg, |
523 | unsigned int data_nents, struct iovec **iov, | |
524 | int *iov_cnt, bool copy_data) | |
f97ec7db | 525 | { |
141685a3 | 526 | int i, dbi; |
26418649 | 527 | int block_remaining = 0; |
141685a3 XL |
528 | void *from, *to = NULL; |
529 | size_t copy_bytes, to_offset, offset; | |
f97ec7db | 530 | struct scatterlist *sg; |
b6df4b79 | 531 | struct page *page; |
f97ec7db IT |
532 | |
533 | for_each_sg(data_sg, sg, data_nents, i) { | |
26418649 | 534 | int sg_remaining = sg->length; |
f97ec7db | 535 | from = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
536 | while (sg_remaining > 0) { |
537 | if (block_remaining == 0) { | |
b6df4b79 XL |
538 | if (to) |
539 | kunmap_atomic(to); | |
540 | ||
26418649 | 541 | block_remaining = DATA_BLOCK_SIZE; |
b6df4b79 XL |
542 | dbi = tcmu_cmd_get_dbi(tcmu_cmd); |
543 | page = tcmu_get_block_page(udev, dbi); | |
544 | to = kmap_atomic(page); | |
26418649 | 545 | } |
141685a3 | 546 | |
26418649 SY |
547 | copy_bytes = min_t(size_t, sg_remaining, |
548 | block_remaining); | |
141685a3 | 549 | to_offset = get_block_offset_user(udev, dbi, |
26418649 | 550 | block_remaining); |
141685a3 | 551 | |
26418649 | 552 | if (*iov_cnt != 0 && |
daf78c30 | 553 | to_offset == iov_tail(*iov)) { |
26418649 SY |
554 | (*iov)->iov_len += copy_bytes; |
555 | } else { | |
556 | new_iov(iov, iov_cnt, udev); | |
141685a3 | 557 | (*iov)->iov_base = (void __user *)to_offset; |
26418649 SY |
558 | (*iov)->iov_len = copy_bytes; |
559 | } | |
f97ec7db | 560 | if (copy_data) { |
c542942c XL |
561 | offset = DATA_BLOCK_SIZE - block_remaining; |
562 | memcpy(to + offset, | |
563 | from + sg->length - sg_remaining, | |
564 | copy_bytes); | |
f97ec7db IT |
565 | tcmu_flush_dcache_range(to, copy_bytes); |
566 | } | |
26418649 SY |
567 | sg_remaining -= copy_bytes; |
568 | block_remaining -= copy_bytes; | |
f97ec7db | 569 | } |
e2e21bd8 | 570 | kunmap_atomic(from - sg->offset); |
f97ec7db | 571 | } |
b6df4b79 XL |
572 | if (to) |
573 | kunmap_atomic(to); | |
f97ec7db | 574 | |
141685a3 | 575 | return 0; |
0c28481f SY |
576 | } |
577 | ||
a5d68ba8 XL |
578 | static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
579 | bool bidi) | |
f97ec7db | 580 | { |
a5d68ba8 | 581 | struct se_cmd *se_cmd = cmd->se_cmd; |
141685a3 | 582 | int i, dbi; |
26418649 | 583 | int block_remaining = 0; |
b6df4b79 | 584 | void *from = NULL, *to; |
141685a3 | 585 | size_t copy_bytes, offset; |
a5d68ba8 | 586 | struct scatterlist *sg, *data_sg; |
b6df4b79 | 587 | struct page *page; |
a5d68ba8 | 588 | unsigned int data_nents; |
141685a3 | 589 | uint32_t count = 0; |
a5d68ba8 XL |
590 | |
591 | if (!bidi) { | |
592 | data_sg = se_cmd->t_data_sg; | |
593 | data_nents = se_cmd->t_data_nents; | |
594 | } else { | |
a5d68ba8 XL |
595 | |
596 | /* | |
597 | * For bidi case, the first count blocks are for Data-Out | |
598 | * buffer blocks, and before gathering the Data-In buffer | |
599 | * the Data-Out buffer blocks should be discarded. | |
600 | */ | |
601 | count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE); | |
a5d68ba8 XL |
602 | |
603 | data_sg = se_cmd->t_bidi_data_sg; | |
604 | data_nents = se_cmd->t_bidi_data_nents; | |
605 | } | |
f97ec7db | 606 | |
141685a3 XL |
607 | tcmu_cmd_set_dbi_cur(cmd, count); |
608 | ||
f97ec7db | 609 | for_each_sg(data_sg, sg, data_nents, i) { |
26418649 | 610 | int sg_remaining = sg->length; |
f97ec7db | 611 | to = kmap_atomic(sg_page(sg)) + sg->offset; |
26418649 SY |
612 | while (sg_remaining > 0) { |
613 | if (block_remaining == 0) { | |
b6df4b79 XL |
614 | if (from) |
615 | kunmap_atomic(from); | |
616 | ||
26418649 | 617 | block_remaining = DATA_BLOCK_SIZE; |
141685a3 | 618 | dbi = tcmu_cmd_get_dbi(cmd); |
b6df4b79 XL |
619 | page = tcmu_get_block_page(udev, dbi); |
620 | from = kmap_atomic(page); | |
26418649 SY |
621 | } |
622 | copy_bytes = min_t(size_t, sg_remaining, | |
623 | block_remaining); | |
141685a3 | 624 | offset = DATA_BLOCK_SIZE - block_remaining; |
f97ec7db | 625 | tcmu_flush_dcache_range(from, copy_bytes); |
c542942c | 626 | memcpy(to + sg->length - sg_remaining, from + offset, |
26418649 | 627 | copy_bytes); |
f97ec7db | 628 | |
26418649 SY |
629 | sg_remaining -= copy_bytes; |
630 | block_remaining -= copy_bytes; | |
f97ec7db | 631 | } |
e2e21bd8 | 632 | kunmap_atomic(to - sg->offset); |
f97ec7db | 633 | } |
b6df4b79 XL |
634 | if (from) |
635 | kunmap_atomic(from); | |
f97ec7db IT |
636 | } |
637 | ||
b6df4b79 | 638 | static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) |
26418649 | 639 | { |
b6df4b79 | 640 | return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); |
26418649 SY |
641 | } |
642 | ||
7c9e7a6f | 643 | /* |
f97ec7db | 644 | * We can't queue a command until we have space available on the cmd ring *and* |
3d9b9555 | 645 | * space available on the data area. |
7c9e7a6f AG |
646 | * |
647 | * Called with ring lock held. | |
648 | */ | |
b6df4b79 XL |
649 | static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, |
650 | size_t cmd_size, size_t data_needed) | |
7c9e7a6f AG |
651 | { |
652 | struct tcmu_mailbox *mb = udev->mb_addr; | |
b6df4b79 XL |
653 | uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1) |
654 | / DATA_BLOCK_SIZE; | |
0241fd39 | 655 | size_t space, cmd_needed; |
7c9e7a6f AG |
656 | u32 cmd_head; |
657 | ||
658 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
659 | ||
660 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
661 | ||
f56574a2 AG |
662 | /* |
663 | * If cmd end-of-ring space is too small then we need space for a NOP plus | |
664 | * original cmd - cmds are internally contiguous. | |
665 | */ | |
666 | if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size) | |
667 | cmd_needed = cmd_size; | |
668 | else | |
669 | cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size); | |
670 | ||
7c9e7a6f AG |
671 | space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size); |
672 | if (space < cmd_needed) { | |
673 | pr_debug("no cmd space: %u %u %u\n", cmd_head, | |
674 | udev->cmdr_last_cleaned, udev->cmdr_size); | |
675 | return false; | |
676 | } | |
677 | ||
b6df4b79 XL |
678 | /* try to check and get the data blocks as needed */ |
679 | space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); | |
7c9e7a6f | 680 | if (space < data_needed) { |
b6df4b79 XL |
681 | unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; |
682 | unsigned long grow; | |
683 | ||
684 | if (blocks_left < blocks_needed) { | |
685 | pr_debug("no data space: only %lu available, but ask for %zu\n", | |
686 | blocks_left * DATA_BLOCK_SIZE, | |
687 | data_needed); | |
688 | return false; | |
689 | } | |
690 | ||
691 | /* Try to expand the thresh */ | |
692 | if (!udev->dbi_thresh) { | |
693 | /* From idle state */ | |
694 | uint32_t init_thresh = DATA_BLOCK_INIT_BITS; | |
695 | ||
696 | udev->dbi_thresh = max(blocks_needed, init_thresh); | |
697 | } else { | |
698 | /* | |
699 | * Grow the data area by max(blocks needed, | |
700 | * dbi_thresh / 2), but limited to the max | |
701 | * DATA_BLOCK_BITS size. | |
702 | */ | |
703 | grow = max(blocks_needed, udev->dbi_thresh / 2); | |
704 | udev->dbi_thresh += grow; | |
705 | if (udev->dbi_thresh > DATA_BLOCK_BITS) | |
706 | udev->dbi_thresh = DATA_BLOCK_BITS; | |
707 | } | |
7c9e7a6f AG |
708 | } |
709 | ||
daf78c30 | 710 | return tcmu_get_empty_blocks(udev, cmd); |
7c9e7a6f AG |
711 | } |
712 | ||
fe25cc34 XL |
713 | static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) |
714 | { | |
715 | return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), | |
716 | sizeof(struct tcmu_cmd_entry)); | |
717 | } | |
718 | ||
719 | static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, | |
720 | size_t base_command_size) | |
721 | { | |
722 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
723 | size_t command_size; | |
724 | ||
725 | command_size = base_command_size + | |
726 | round_up(scsi_command_size(se_cmd->t_task_cdb), | |
727 | TCMU_OP_ALIGN_SIZE); | |
728 | ||
729 | WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); | |
730 | ||
731 | return command_size; | |
732 | } | |
733 | ||
0d44374c MC |
734 | static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd) |
735 | { | |
736 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
737 | unsigned long tmo = udev->cmd_time_out; | |
738 | int cmd_id; | |
739 | ||
740 | if (tcmu_cmd->cmd_id) | |
741 | return 0; | |
742 | ||
743 | cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT); | |
744 | if (cmd_id < 0) { | |
745 | pr_err("tcmu: Could not allocate cmd id.\n"); | |
746 | return cmd_id; | |
747 | } | |
748 | tcmu_cmd->cmd_id = cmd_id; | |
749 | ||
750 | if (!tmo) | |
751 | return 0; | |
752 | ||
753 | tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo)); | |
754 | mod_timer(&udev->timeout, tcmu_cmd->deadline); | |
755 | return 0; | |
756 | } | |
757 | ||
02eb924f AG |
758 | static sense_reason_t |
759 | tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) | |
7c9e7a6f AG |
760 | { |
761 | struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; | |
762 | struct se_cmd *se_cmd = tcmu_cmd->se_cmd; | |
763 | size_t base_command_size, command_size; | |
7c9e7a6f | 764 | struct tcmu_mailbox *mb; |
7c9e7a6f | 765 | struct tcmu_cmd_entry *entry; |
7c9e7a6f | 766 | struct iovec *iov; |
141685a3 | 767 | int iov_cnt, ret; |
7c9e7a6f AG |
768 | uint32_t cmd_head; |
769 | uint64_t cdb_off; | |
f97ec7db | 770 | bool copy_to_data_area; |
ab22d260 | 771 | size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); |
7c9e7a6f AG |
772 | |
773 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) | |
02eb924f | 774 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
775 | |
776 | /* | |
777 | * Must be a certain minimum size for response sense info, but | |
778 | * also may be larger if the iov array is large. | |
779 | * | |
fe25cc34 XL |
780 | * We prepare as many iovs as possbile for potential uses here, |
781 | * because it's expensive to tell how many regions are freed in | |
782 | * the bitmap & global data pool, as the size calculated here | |
783 | * will only be used to do the checks. | |
784 | * | |
785 | * The size will be recalculated later as actually needed to save | |
786 | * cmd area memories. | |
787 | */ | |
788 | base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); | |
789 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
7c9e7a6f | 790 | |
b6df4b79 | 791 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
792 | |
793 | mb = udev->mb_addr; | |
794 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
554617b2 AG |
795 | if ((command_size > (udev->cmdr_size / 2)) || |
796 | data_length > udev->data_size) { | |
797 | pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " | |
3d9b9555 | 798 | "cmd ring/data area\n", command_size, data_length, |
7c9e7a6f | 799 | udev->cmdr_size, udev->data_size); |
b6df4b79 | 800 | mutex_unlock(&udev->cmdr_lock); |
554617b2 AG |
801 | return TCM_INVALID_CDB_FIELD; |
802 | } | |
7c9e7a6f | 803 | |
b6df4b79 | 804 | while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) { |
7c9e7a6f AG |
805 | int ret; |
806 | DEFINE_WAIT(__wait); | |
807 | ||
6bc46be4 MC |
808 | /* |
809 | * Don't leave commands partially setup because the unmap | |
810 | * thread might need the blocks to make forward progress. | |
811 | */ | |
812 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur); | |
813 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); | |
814 | ||
7c9e7a6f AG |
815 | prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE); |
816 | ||
817 | pr_debug("sleeping for ring space\n"); | |
b6df4b79 | 818 | mutex_unlock(&udev->cmdr_lock); |
af980e46 MC |
819 | if (udev->cmd_time_out) |
820 | ret = schedule_timeout( | |
821 | msecs_to_jiffies(udev->cmd_time_out)); | |
822 | else | |
823 | ret = schedule_timeout(msecs_to_jiffies(TCMU_TIME_OUT)); | |
7c9e7a6f AG |
824 | finish_wait(&udev->wait_cmdr, &__wait); |
825 | if (!ret) { | |
826 | pr_warn("tcmu: command timed out\n"); | |
02eb924f | 827 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
828 | } |
829 | ||
b6df4b79 | 830 | mutex_lock(&udev->cmdr_lock); |
7c9e7a6f AG |
831 | |
832 | /* We dropped cmdr_lock, cmd_head is stale */ | |
833 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
834 | } | |
835 | ||
f56574a2 AG |
836 | /* Insert a PAD if end-of-ring space is too small */ |
837 | if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { | |
838 | size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); | |
839 | ||
7c9e7a6f | 840 | entry = (void *) mb + CMDR_OFF + cmd_head; |
0ad46af8 AG |
841 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); |
842 | tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); | |
843 | entry->hdr.cmd_id = 0; /* not used for PAD */ | |
844 | entry->hdr.kflags = 0; | |
845 | entry->hdr.uflags = 0; | |
9d62bc0e | 846 | tcmu_flush_dcache_range(entry, sizeof(*entry)); |
7c9e7a6f AG |
847 | |
848 | UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); | |
9d62bc0e | 849 | tcmu_flush_dcache_range(mb, sizeof(*mb)); |
7c9e7a6f AG |
850 | |
851 | cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ | |
852 | WARN_ON(cmd_head != 0); | |
853 | } | |
854 | ||
855 | entry = (void *) mb + CMDR_OFF + cmd_head; | |
b3743c71 | 856 | memset(entry, 0, command_size); |
0ad46af8 | 857 | tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); |
7c9e7a6f | 858 | |
3d9b9555 | 859 | /* Handle allocating space from the data area */ |
b6df4b79 | 860 | tcmu_cmd_reset_dbi_cur(tcmu_cmd); |
7c9e7a6f | 861 | iov = &entry->req.iov[0]; |
f97ec7db | 862 | iov_cnt = 0; |
e4648b01 IT |
863 | copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE |
864 | || se_cmd->se_cmd_flags & SCF_BIDI); | |
b6df4b79 XL |
865 | ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg, |
866 | se_cmd->t_data_nents, &iov, &iov_cnt, | |
867 | copy_to_data_area); | |
141685a3 | 868 | if (ret) { |
b6df4b79 XL |
869 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
870 | mutex_unlock(&udev->cmdr_lock); | |
871 | ||
141685a3 XL |
872 | pr_err("tcmu: alloc and scatter data failed\n"); |
873 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
874 | } | |
7c9e7a6f AG |
875 | entry->req.iov_cnt = iov_cnt; |
876 | ||
e4648b01 | 877 | /* Handle BIDI commands */ |
b3743c71 | 878 | iov_cnt = 0; |
ab22d260 | 879 | if (se_cmd->se_cmd_flags & SCF_BIDI) { |
ab22d260 | 880 | iov++; |
b6df4b79 | 881 | ret = scatter_data_area(udev, tcmu_cmd, |
141685a3 XL |
882 | se_cmd->t_bidi_data_sg, |
883 | se_cmd->t_bidi_data_nents, | |
884 | &iov, &iov_cnt, false); | |
885 | if (ret) { | |
b6df4b79 XL |
886 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); |
887 | mutex_unlock(&udev->cmdr_lock); | |
888 | ||
141685a3 XL |
889 | pr_err("tcmu: alloc and scatter bidi data failed\n"); |
890 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
891 | } | |
ab22d260 | 892 | } |
b3743c71 | 893 | entry->req.iov_bidi_cnt = iov_cnt; |
26418649 | 894 | |
0d44374c MC |
895 | ret = tcmu_setup_cmd_timer(tcmu_cmd); |
896 | if (ret) { | |
897 | tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt); | |
97488c73 | 898 | mutex_unlock(&udev->cmdr_lock); |
0d44374c MC |
899 | return TCM_OUT_OF_RESOURCES; |
900 | } | |
901 | entry->hdr.cmd_id = tcmu_cmd->cmd_id; | |
902 | ||
fe25cc34 XL |
903 | /* |
904 | * Recalaulate the command's base size and size according | |
905 | * to the actual needs | |
906 | */ | |
907 | base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + | |
908 | entry->req.iov_bidi_cnt); | |
909 | command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); | |
910 | ||
911 | tcmu_hdr_set_len(&entry->hdr.len_op, command_size); | |
912 | ||
7c9e7a6f AG |
913 | /* All offsets relative to mb_addr, not start of entry! */ |
914 | cdb_off = CMDR_OFF + cmd_head + base_command_size; | |
915 | memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); | |
916 | entry->req.cdb_off = cdb_off; | |
917 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
918 | ||
919 | UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size); | |
920 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
b6df4b79 | 921 | mutex_unlock(&udev->cmdr_lock); |
7c9e7a6f AG |
922 | |
923 | /* TODO: only if FLUSH and FUA? */ | |
924 | uio_event_notify(&udev->uio_info); | |
925 | ||
af980e46 MC |
926 | if (udev->cmd_time_out) |
927 | mod_timer(&udev->timeout, round_jiffies_up(jiffies + | |
928 | msecs_to_jiffies(udev->cmd_time_out))); | |
7c9e7a6f | 929 | |
02eb924f | 930 | return TCM_NO_SENSE; |
7c9e7a6f AG |
931 | } |
932 | ||
02eb924f AG |
933 | static sense_reason_t |
934 | tcmu_queue_cmd(struct se_cmd *se_cmd) | |
7c9e7a6f | 935 | { |
7c9e7a6f | 936 | struct tcmu_cmd *tcmu_cmd; |
ecaf597b | 937 | sense_reason_t ret; |
7c9e7a6f AG |
938 | |
939 | tcmu_cmd = tcmu_alloc_cmd(se_cmd); | |
940 | if (!tcmu_cmd) | |
02eb924f | 941 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
7c9e7a6f AG |
942 | |
943 | ret = tcmu_queue_cmd_ring(tcmu_cmd); | |
02eb924f | 944 | if (ret != TCM_NO_SENSE) { |
7c9e7a6f | 945 | pr_err("TCMU: Could not queue command\n"); |
7c9e7a6f | 946 | |
141685a3 | 947 | tcmu_free_cmd(tcmu_cmd); |
7c9e7a6f AG |
948 | } |
949 | ||
950 | return ret; | |
951 | } | |
952 | ||
953 | static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry) | |
954 | { | |
955 | struct se_cmd *se_cmd = cmd->se_cmd; | |
956 | struct tcmu_dev *udev = cmd->tcmu_dev; | |
957 | ||
141685a3 XL |
958 | /* |
959 | * cmd has been completed already from timeout, just reclaim | |
960 | * data area space and free cmd | |
961 | */ | |
962 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
963 | goto out; | |
b25c7863 | 964 | |
141685a3 | 965 | tcmu_cmd_reset_dbi_cur(cmd); |
7c9e7a6f | 966 | |
0ad46af8 | 967 | if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) { |
0ad46af8 AG |
968 | pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n", |
969 | cmd->se_cmd); | |
ed97d0cd AG |
970 | entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION; |
971 | } else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) { | |
406f74c2 | 972 | transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer); |
e4648b01 | 973 | } else if (se_cmd->se_cmd_flags & SCF_BIDI) { |
26418649 | 974 | /* Get Data-In buffer before clean up */ |
a5d68ba8 | 975 | gather_data_area(udev, cmd, true); |
e4648b01 | 976 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { |
a5d68ba8 | 977 | gather_data_area(udev, cmd, false); |
7c9e7a6f | 978 | } else if (se_cmd->data_direction == DMA_TO_DEVICE) { |
141685a3 | 979 | /* TODO: */ |
2bc396a2 IT |
980 | } else if (se_cmd->data_direction != DMA_NONE) { |
981 | pr_warn("TCMU: data direction was %d!\n", | |
982 | se_cmd->data_direction); | |
7c9e7a6f AG |
983 | } |
984 | ||
985 | target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status); | |
7c9e7a6f | 986 | |
141685a3 XL |
987 | out: |
988 | cmd->se_cmd = NULL; | |
b6df4b79 | 989 | tcmu_cmd_free_data(cmd, cmd->dbi_cnt); |
141685a3 | 990 | tcmu_free_cmd(cmd); |
7c9e7a6f AG |
991 | } |
992 | ||
993 | static unsigned int tcmu_handle_completions(struct tcmu_dev *udev) | |
994 | { | |
995 | struct tcmu_mailbox *mb; | |
7c9e7a6f AG |
996 | int handled = 0; |
997 | ||
998 | if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) { | |
999 | pr_err("ring broken, not handling completions\n"); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
7c9e7a6f AG |
1003 | mb = udev->mb_addr; |
1004 | tcmu_flush_dcache_range(mb, sizeof(*mb)); | |
1005 | ||
6aa7de05 | 1006 | while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) { |
7c9e7a6f AG |
1007 | |
1008 | struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned; | |
1009 | struct tcmu_cmd *cmd; | |
1010 | ||
1011 | tcmu_flush_dcache_range(entry, sizeof(*entry)); | |
1012 | ||
0ad46af8 AG |
1013 | if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) { |
1014 | UPDATE_HEAD(udev->cmdr_last_cleaned, | |
1015 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1016 | udev->cmdr_size); | |
7c9e7a6f AG |
1017 | continue; |
1018 | } | |
0ad46af8 | 1019 | WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD); |
7c9e7a6f AG |
1020 | |
1021 | spin_lock(&udev->commands_lock); | |
d3e709e6 | 1022 | cmd = idr_remove(&udev->commands, entry->hdr.cmd_id); |
7c9e7a6f AG |
1023 | spin_unlock(&udev->commands_lock); |
1024 | ||
1025 | if (!cmd) { | |
1026 | pr_err("cmd_id not found, ring is broken\n"); | |
1027 | set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags); | |
1028 | break; | |
1029 | } | |
1030 | ||
1031 | tcmu_handle_completion(cmd, entry); | |
1032 | ||
0ad46af8 AG |
1033 | UPDATE_HEAD(udev->cmdr_last_cleaned, |
1034 | tcmu_hdr_get_len(entry->hdr.len_op), | |
1035 | udev->cmdr_size); | |
7c9e7a6f AG |
1036 | |
1037 | handled++; | |
1038 | } | |
1039 | ||
1040 | if (mb->cmd_tail == mb->cmd_head) | |
1041 | del_timer(&udev->timeout); /* no more pending cmds */ | |
1042 | ||
7c9e7a6f AG |
1043 | wake_up(&udev->wait_cmdr); |
1044 | ||
1045 | return handled; | |
1046 | } | |
1047 | ||
1048 | static int tcmu_check_expired_cmd(int id, void *p, void *data) | |
1049 | { | |
1050 | struct tcmu_cmd *cmd = p; | |
1051 | ||
1052 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) | |
1053 | return 0; | |
1054 | ||
611e2267 | 1055 | if (!time_after(jiffies, cmd->deadline)) |
7c9e7a6f AG |
1056 | return 0; |
1057 | ||
1058 | set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags); | |
1059 | target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); | |
1060 | cmd->se_cmd = NULL; | |
1061 | ||
7c9e7a6f AG |
1062 | return 0; |
1063 | } | |
1064 | ||
e99e88a9 | 1065 | static void tcmu_device_timedout(struct timer_list *t) |
7c9e7a6f | 1066 | { |
e99e88a9 | 1067 | struct tcmu_dev *udev = from_timer(udev, t, timeout); |
7c9e7a6f | 1068 | unsigned long flags; |
7c9e7a6f AG |
1069 | |
1070 | spin_lock_irqsave(&udev->commands_lock, flags); | |
1071 | idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL); | |
1072 | spin_unlock_irqrestore(&udev->commands_lock, flags); | |
1073 | ||
b6df4b79 XL |
1074 | /* Try to wake up the ummap thread */ |
1075 | wake_up(&unmap_wait); | |
1076 | ||
7c9e7a6f AG |
1077 | /* |
1078 | * We don't need to wakeup threads on wait_cmdr since they have their | |
1079 | * own timeout. | |
1080 | */ | |
1081 | } | |
1082 | ||
1083 | static int tcmu_attach_hba(struct se_hba *hba, u32 host_id) | |
1084 | { | |
1085 | struct tcmu_hba *tcmu_hba; | |
1086 | ||
1087 | tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL); | |
1088 | if (!tcmu_hba) | |
1089 | return -ENOMEM; | |
1090 | ||
1091 | tcmu_hba->host_id = host_id; | |
1092 | hba->hba_ptr = tcmu_hba; | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static void tcmu_detach_hba(struct se_hba *hba) | |
1098 | { | |
1099 | kfree(hba->hba_ptr); | |
1100 | hba->hba_ptr = NULL; | |
1101 | } | |
1102 | ||
1103 | static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) | |
1104 | { | |
1105 | struct tcmu_dev *udev; | |
1106 | ||
1107 | udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL); | |
1108 | if (!udev) | |
1109 | return NULL; | |
f3cdbe39 | 1110 | kref_init(&udev->kref); |
7c9e7a6f AG |
1111 | |
1112 | udev->name = kstrdup(name, GFP_KERNEL); | |
1113 | if (!udev->name) { | |
1114 | kfree(udev); | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | udev->hba = hba; | |
af980e46 | 1119 | udev->cmd_time_out = TCMU_TIME_OUT; |
7c9e7a6f AG |
1120 | |
1121 | init_waitqueue_head(&udev->wait_cmdr); | |
b6df4b79 | 1122 | mutex_init(&udev->cmdr_lock); |
7c9e7a6f AG |
1123 | |
1124 | idr_init(&udev->commands); | |
1125 | spin_lock_init(&udev->commands_lock); | |
1126 | ||
e99e88a9 | 1127 | timer_setup(&udev->timeout, tcmu_device_timedout, 0); |
7c9e7a6f | 1128 | |
b3af66e2 MC |
1129 | init_waitqueue_head(&udev->nl_cmd_wq); |
1130 | spin_lock_init(&udev->nl_cmd_lock); | |
1131 | ||
c22adc0b XL |
1132 | INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); |
1133 | ||
7c9e7a6f AG |
1134 | return &udev->se_dev; |
1135 | } | |
1136 | ||
1137 | static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on) | |
1138 | { | |
1139 | struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info); | |
1140 | ||
b6df4b79 | 1141 | mutex_lock(&tcmu_dev->cmdr_lock); |
7c9e7a6f | 1142 | tcmu_handle_completions(tcmu_dev); |
b6df4b79 | 1143 | mutex_unlock(&tcmu_dev->cmdr_lock); |
7c9e7a6f AG |
1144 | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * mmap code from uio.c. Copied here because we want to hook mmap() | |
1150 | * and this stuff must come along. | |
1151 | */ | |
1152 | static int tcmu_find_mem_index(struct vm_area_struct *vma) | |
1153 | { | |
1154 | struct tcmu_dev *udev = vma->vm_private_data; | |
1155 | struct uio_info *info = &udev->uio_info; | |
1156 | ||
1157 | if (vma->vm_pgoff < MAX_UIO_MAPS) { | |
1158 | if (info->mem[vma->vm_pgoff].size == 0) | |
1159 | return -1; | |
1160 | return (int)vma->vm_pgoff; | |
1161 | } | |
1162 | return -1; | |
1163 | } | |
1164 | ||
b6df4b79 XL |
1165 | static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) |
1166 | { | |
1167 | struct page *page; | |
1168 | int ret; | |
1169 | ||
1170 | mutex_lock(&udev->cmdr_lock); | |
1171 | page = tcmu_get_block_page(udev, dbi); | |
1172 | if (likely(page)) { | |
1173 | mutex_unlock(&udev->cmdr_lock); | |
1174 | return page; | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * Normally it shouldn't be here: | |
1179 | * Only when the userspace has touched the blocks which | |
1180 | * are out of the tcmu_cmd's data iov[], and will return | |
1181 | * one zeroed page. | |
1182 | */ | |
1183 | pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi); | |
1184 | pr_warn("Mostly it will be a bug of userspace, please have a check!\n"); | |
1185 | ||
1186 | if (dbi >= udev->dbi_thresh) { | |
1187 | /* Extern the udev->dbi_thresh to dbi + 1 */ | |
1188 | udev->dbi_thresh = dbi + 1; | |
1189 | udev->dbi_max = dbi; | |
1190 | } | |
1191 | ||
1192 | page = radix_tree_lookup(&udev->data_blocks, dbi); | |
1193 | if (!page) { | |
1194 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1195 | if (!page) { | |
1196 | mutex_unlock(&udev->cmdr_lock); | |
1197 | return NULL; | |
1198 | } | |
1199 | ||
1200 | ret = radix_tree_insert(&udev->data_blocks, dbi, page); | |
1201 | if (ret) { | |
1202 | mutex_unlock(&udev->cmdr_lock); | |
1203 | __free_page(page); | |
1204 | return NULL; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Since this case is rare in page fault routine, here we | |
1209 | * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS | |
1210 | * to reduce possible page fault call trace. | |
1211 | */ | |
1212 | atomic_inc(&global_db_count); | |
1213 | } | |
1214 | mutex_unlock(&udev->cmdr_lock); | |
1215 | ||
1216 | return page; | |
1217 | } | |
1218 | ||
11bac800 | 1219 | static int tcmu_vma_fault(struct vm_fault *vmf) |
7c9e7a6f | 1220 | { |
11bac800 | 1221 | struct tcmu_dev *udev = vmf->vma->vm_private_data; |
7c9e7a6f AG |
1222 | struct uio_info *info = &udev->uio_info; |
1223 | struct page *page; | |
1224 | unsigned long offset; | |
1225 | void *addr; | |
1226 | ||
11bac800 | 1227 | int mi = tcmu_find_mem_index(vmf->vma); |
7c9e7a6f AG |
1228 | if (mi < 0) |
1229 | return VM_FAULT_SIGBUS; | |
1230 | ||
1231 | /* | |
1232 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
1233 | * to use mem[N]. | |
1234 | */ | |
1235 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
1236 | ||
141685a3 XL |
1237 | if (offset < udev->data_off) { |
1238 | /* For the vmalloc()ed cmd area pages */ | |
1239 | addr = (void *)(unsigned long)info->mem[mi].addr + offset; | |
7c9e7a6f | 1240 | page = vmalloc_to_page(addr); |
141685a3 | 1241 | } else { |
141685a3 XL |
1242 | uint32_t dbi; |
1243 | ||
b6df4b79 | 1244 | /* For the dynamically growing data area pages */ |
141685a3 | 1245 | dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE; |
b6df4b79 XL |
1246 | page = tcmu_try_get_block_page(udev, dbi); |
1247 | if (!page) | |
141685a3 | 1248 | return VM_FAULT_NOPAGE; |
141685a3 XL |
1249 | } |
1250 | ||
7c9e7a6f AG |
1251 | get_page(page); |
1252 | vmf->page = page; | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | static const struct vm_operations_struct tcmu_vm_ops = { | |
1257 | .fault = tcmu_vma_fault, | |
1258 | }; | |
1259 | ||
1260 | static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
1261 | { | |
1262 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1263 | ||
1264 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
1265 | vma->vm_ops = &tcmu_vm_ops; | |
1266 | ||
1267 | vma->vm_private_data = udev; | |
1268 | ||
1269 | /* Ensure the mmap is exactly the right size */ | |
1270 | if (vma_pages(vma) != (TCMU_RING_SIZE >> PAGE_SHIFT)) | |
1271 | return -EINVAL; | |
1272 | ||
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static int tcmu_open(struct uio_info *info, struct inode *inode) | |
1277 | { | |
1278 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1279 | ||
1280 | /* O_EXCL not supported for char devs, so fake it? */ | |
1281 | if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags)) | |
1282 | return -EBUSY; | |
1283 | ||
b6df4b79 | 1284 | udev->inode = inode; |
9260695d | 1285 | kref_get(&udev->kref); |
b6df4b79 | 1286 | |
7c9e7a6f AG |
1287 | pr_debug("open\n"); |
1288 | ||
1289 | return 0; | |
1290 | } | |
1291 | ||
f3cdbe39 MC |
1292 | static void tcmu_dev_call_rcu(struct rcu_head *p) |
1293 | { | |
1294 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
1295 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1296 | ||
1297 | kfree(udev->uio_info.name); | |
1298 | kfree(udev->name); | |
1299 | kfree(udev); | |
1300 | } | |
1301 | ||
c22adc0b XL |
1302 | static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) |
1303 | { | |
1304 | if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) { | |
1305 | kmem_cache_free(tcmu_cmd_cache, cmd); | |
1306 | return 0; | |
1307 | } | |
1308 | return -EINVAL; | |
1309 | } | |
1310 | ||
1311 | static void tcmu_blocks_release(struct tcmu_dev *udev) | |
1312 | { | |
1313 | int i; | |
1314 | struct page *page; | |
1315 | ||
1316 | /* Try to release all block pages */ | |
1317 | mutex_lock(&udev->cmdr_lock); | |
1318 | for (i = 0; i <= udev->dbi_max; i++) { | |
1319 | page = radix_tree_delete(&udev->data_blocks, i); | |
1320 | if (page) { | |
1321 | __free_page(page); | |
1322 | atomic_dec(&global_db_count); | |
1323 | } | |
1324 | } | |
1325 | mutex_unlock(&udev->cmdr_lock); | |
1326 | } | |
1327 | ||
f3cdbe39 MC |
1328 | static void tcmu_dev_kref_release(struct kref *kref) |
1329 | { | |
1330 | struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref); | |
1331 | struct se_device *dev = &udev->se_dev; | |
c22adc0b XL |
1332 | struct tcmu_cmd *cmd; |
1333 | bool all_expired = true; | |
1334 | int i; | |
1335 | ||
1336 | vfree(udev->mb_addr); | |
1337 | udev->mb_addr = NULL; | |
1338 | ||
1339 | /* Upper layer should drain all requests before calling this */ | |
1340 | spin_lock_irq(&udev->commands_lock); | |
1341 | idr_for_each_entry(&udev->commands, cmd, i) { | |
1342 | if (tcmu_check_and_free_pending_cmd(cmd) != 0) | |
1343 | all_expired = false; | |
1344 | } | |
1345 | idr_destroy(&udev->commands); | |
1346 | spin_unlock_irq(&udev->commands_lock); | |
1347 | WARN_ON(!all_expired); | |
1348 | ||
1349 | tcmu_blocks_release(udev); | |
f3cdbe39 MC |
1350 | |
1351 | call_rcu(&dev->rcu_head, tcmu_dev_call_rcu); | |
1352 | } | |
1353 | ||
7c9e7a6f AG |
1354 | static int tcmu_release(struct uio_info *info, struct inode *inode) |
1355 | { | |
1356 | struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info); | |
1357 | ||
1358 | clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); | |
1359 | ||
1360 | pr_debug("close\n"); | |
9260695d | 1361 | /* release ref from open */ |
f3cdbe39 | 1362 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1363 | return 0; |
1364 | } | |
1365 | ||
b3af66e2 MC |
1366 | static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd) |
1367 | { | |
1368 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1369 | ||
1370 | if (!tcmu_kern_cmd_reply_supported) | |
1371 | return; | |
b849b456 KN |
1372 | |
1373 | if (udev->nl_reply_supported <= 0) | |
1374 | return; | |
1375 | ||
b3af66e2 MC |
1376 | relock: |
1377 | spin_lock(&udev->nl_cmd_lock); | |
1378 | ||
1379 | if (nl_cmd->cmd != TCMU_CMD_UNSPEC) { | |
1380 | spin_unlock(&udev->nl_cmd_lock); | |
1381 | pr_debug("sleeping for open nl cmd\n"); | |
1382 | wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC)); | |
1383 | goto relock; | |
1384 | } | |
1385 | ||
1386 | memset(nl_cmd, 0, sizeof(*nl_cmd)); | |
1387 | nl_cmd->cmd = cmd; | |
1388 | init_completion(&nl_cmd->complete); | |
1389 | ||
1390 | spin_unlock(&udev->nl_cmd_lock); | |
1391 | } | |
1392 | ||
1393 | static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev) | |
1394 | { | |
1395 | struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd; | |
1396 | int ret; | |
b3af66e2 MC |
1397 | |
1398 | if (!tcmu_kern_cmd_reply_supported) | |
1399 | return 0; | |
1400 | ||
b849b456 KN |
1401 | if (udev->nl_reply_supported <= 0) |
1402 | return 0; | |
1403 | ||
b3af66e2 MC |
1404 | pr_debug("sleeping for nl reply\n"); |
1405 | wait_for_completion(&nl_cmd->complete); | |
1406 | ||
1407 | spin_lock(&udev->nl_cmd_lock); | |
1408 | nl_cmd->cmd = TCMU_CMD_UNSPEC; | |
1409 | ret = nl_cmd->status; | |
1410 | nl_cmd->status = 0; | |
1411 | spin_unlock(&udev->nl_cmd_lock); | |
1412 | ||
1413 | wake_up_all(&udev->nl_cmd_wq); | |
1414 | ||
1415 | return ret;; | |
1416 | } | |
1417 | ||
1418 | static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd, | |
1419 | int reconfig_attr, const void *reconfig_data) | |
7c9e7a6f AG |
1420 | { |
1421 | struct sk_buff *skb; | |
1422 | void *msg_header; | |
6e14eab9 | 1423 | int ret = -ENOMEM; |
7c9e7a6f AG |
1424 | |
1425 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1426 | if (!skb) | |
6e14eab9 | 1427 | return ret; |
7c9e7a6f AG |
1428 | |
1429 | msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd); | |
6e14eab9 NB |
1430 | if (!msg_header) |
1431 | goto free_skb; | |
7c9e7a6f | 1432 | |
b3af66e2 | 1433 | ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name); |
6e14eab9 NB |
1434 | if (ret < 0) |
1435 | goto free_skb; | |
7c9e7a6f | 1436 | |
b3af66e2 MC |
1437 | ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor); |
1438 | if (ret < 0) | |
1439 | goto free_skb; | |
1440 | ||
1441 | ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index); | |
6e14eab9 NB |
1442 | if (ret < 0) |
1443 | goto free_skb; | |
7c9e7a6f | 1444 | |
2d76443e MC |
1445 | if (cmd == TCMU_CMD_RECONFIG_DEVICE) { |
1446 | switch (reconfig_attr) { | |
1447 | case TCMU_ATTR_DEV_CFG: | |
1448 | ret = nla_put_string(skb, reconfig_attr, reconfig_data); | |
1449 | break; | |
1450 | case TCMU_ATTR_DEV_SIZE: | |
1451 | ret = nla_put_u64_64bit(skb, reconfig_attr, | |
1452 | *((u64 *)reconfig_data), | |
1453 | TCMU_ATTR_PAD); | |
1454 | break; | |
1455 | case TCMU_ATTR_WRITECACHE: | |
1456 | ret = nla_put_u8(skb, reconfig_attr, | |
1457 | *((u8 *)reconfig_data)); | |
1458 | break; | |
1459 | default: | |
1460 | BUG(); | |
1461 | } | |
1462 | ||
1463 | if (ret < 0) | |
1464 | goto free_skb; | |
1465 | } | |
8a45885c | 1466 | |
053c095a | 1467 | genlmsg_end(skb, msg_header); |
7c9e7a6f | 1468 | |
b3af66e2 MC |
1469 | tcmu_init_genl_cmd_reply(udev, cmd); |
1470 | ||
20c08b36 | 1471 | ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, |
7c9e7a6f | 1472 | TCMU_MCGRP_CONFIG, GFP_KERNEL); |
7c9e7a6f AG |
1473 | /* We don't care if no one is listening */ |
1474 | if (ret == -ESRCH) | |
1475 | ret = 0; | |
b3af66e2 MC |
1476 | if (!ret) |
1477 | ret = tcmu_wait_genl_cmd_reply(udev); | |
7c9e7a6f AG |
1478 | |
1479 | return ret; | |
6e14eab9 NB |
1480 | free_skb: |
1481 | nlmsg_free(skb); | |
1482 | return ret; | |
7c9e7a6f AG |
1483 | } |
1484 | ||
de8c5221 | 1485 | static int tcmu_update_uio_info(struct tcmu_dev *udev) |
7c9e7a6f | 1486 | { |
7c9e7a6f AG |
1487 | struct tcmu_hba *hba = udev->hba->hba_ptr; |
1488 | struct uio_info *info; | |
de8c5221 | 1489 | size_t size, used; |
7c9e7a6f AG |
1490 | char *str; |
1491 | ||
1492 | info = &udev->uio_info; | |
7c9e7a6f AG |
1493 | size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name, |
1494 | udev->dev_config); | |
1495 | size += 1; /* for \0 */ | |
1496 | str = kmalloc(size, GFP_KERNEL); | |
1497 | if (!str) | |
1498 | return -ENOMEM; | |
1499 | ||
1500 | used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name); | |
7c9e7a6f AG |
1501 | if (udev->dev_config[0]) |
1502 | snprintf(str + used, size - used, "/%s", udev->dev_config); | |
1503 | ||
ededd039 BL |
1504 | /* If the old string exists, free it */ |
1505 | kfree(info->name); | |
7c9e7a6f AG |
1506 | info->name = str; |
1507 | ||
de8c5221 BL |
1508 | return 0; |
1509 | } | |
1510 | ||
1511 | static int tcmu_configure_device(struct se_device *dev) | |
1512 | { | |
1513 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1514 | struct uio_info *info; | |
1515 | struct tcmu_mailbox *mb; | |
1516 | int ret = 0; | |
1517 | ||
1518 | ret = tcmu_update_uio_info(udev); | |
1519 | if (ret) | |
1520 | return ret; | |
1521 | ||
1522 | info = &udev->uio_info; | |
1523 | ||
141685a3 | 1524 | udev->mb_addr = vzalloc(CMDR_SIZE); |
7c9e7a6f AG |
1525 | if (!udev->mb_addr) { |
1526 | ret = -ENOMEM; | |
1527 | goto err_vzalloc; | |
1528 | } | |
1529 | ||
1530 | /* mailbox fits in first part of CMDR space */ | |
1531 | udev->cmdr_size = CMDR_SIZE - CMDR_OFF; | |
1532 | udev->data_off = CMDR_SIZE; | |
141685a3 | 1533 | udev->data_size = DATA_SIZE; |
b6df4b79 XL |
1534 | udev->dbi_thresh = 0; /* Default in Idle state */ |
1535 | udev->waiting_global = false; | |
7c9e7a6f | 1536 | |
141685a3 | 1537 | /* Initialise the mailbox of the ring buffer */ |
7c9e7a6f | 1538 | mb = udev->mb_addr; |
0ad46af8 | 1539 | mb->version = TCMU_MAILBOX_VERSION; |
32c76de3 | 1540 | mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC; |
7c9e7a6f AG |
1541 | mb->cmdr_off = CMDR_OFF; |
1542 | mb->cmdr_size = udev->cmdr_size; | |
1543 | ||
1544 | WARN_ON(!PAGE_ALIGNED(udev->data_off)); | |
1545 | WARN_ON(udev->data_size % PAGE_SIZE); | |
26418649 | 1546 | WARN_ON(udev->data_size % DATA_BLOCK_SIZE); |
7c9e7a6f | 1547 | |
ac64a2ce | 1548 | info->version = __stringify(TCMU_MAILBOX_VERSION); |
7c9e7a6f AG |
1549 | |
1550 | info->mem[0].name = "tcm-user command & data buffer"; | |
0633e123 | 1551 | info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr; |
7c9e7a6f | 1552 | info->mem[0].size = TCMU_RING_SIZE; |
141685a3 | 1553 | info->mem[0].memtype = UIO_MEM_NONE; |
7c9e7a6f AG |
1554 | |
1555 | info->irqcontrol = tcmu_irqcontrol; | |
1556 | info->irq = UIO_IRQ_CUSTOM; | |
1557 | ||
1558 | info->mmap = tcmu_mmap; | |
1559 | info->open = tcmu_open; | |
1560 | info->release = tcmu_release; | |
1561 | ||
1562 | ret = uio_register_device(tcmu_root_device, info); | |
1563 | if (ret) | |
1564 | goto err_register; | |
1565 | ||
81ee28de SY |
1566 | /* User can set hw_block_size before enable the device */ |
1567 | if (dev->dev_attrib.hw_block_size == 0) | |
1568 | dev->dev_attrib.hw_block_size = 512; | |
7c9e7a6f | 1569 | /* Other attributes can be configured in userspace */ |
3abaa2bf MC |
1570 | if (!dev->dev_attrib.hw_max_sectors) |
1571 | dev->dev_attrib.hw_max_sectors = 128; | |
9a8bb606 BL |
1572 | if (!dev->dev_attrib.emulate_write_cache) |
1573 | dev->dev_attrib.emulate_write_cache = 0; | |
7c9e7a6f AG |
1574 | dev->dev_attrib.hw_queue_depth = 128; |
1575 | ||
b849b456 KN |
1576 | /* If user didn't explicitly disable netlink reply support, use |
1577 | * module scope setting. | |
1578 | */ | |
1579 | if (udev->nl_reply_supported >= 0) | |
1580 | udev->nl_reply_supported = tcmu_kern_cmd_reply_supported; | |
1581 | ||
f3cdbe39 MC |
1582 | /* |
1583 | * Get a ref incase userspace does a close on the uio device before | |
1584 | * LIO has initiated tcmu_free_device. | |
1585 | */ | |
1586 | kref_get(&udev->kref); | |
1587 | ||
b3af66e2 | 1588 | ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL); |
7c9e7a6f AG |
1589 | if (ret) |
1590 | goto err_netlink; | |
1591 | ||
b6df4b79 XL |
1592 | mutex_lock(&root_udev_mutex); |
1593 | list_add(&udev->node, &root_udev); | |
1594 | mutex_unlock(&root_udev_mutex); | |
1595 | ||
7c9e7a6f AG |
1596 | return 0; |
1597 | ||
1598 | err_netlink: | |
f3cdbe39 | 1599 | kref_put(&udev->kref, tcmu_dev_kref_release); |
7c9e7a6f AG |
1600 | uio_unregister_device(&udev->uio_info); |
1601 | err_register: | |
1602 | vfree(udev->mb_addr); | |
c22adc0b | 1603 | udev->mb_addr = NULL; |
7c9e7a6f AG |
1604 | err_vzalloc: |
1605 | kfree(info->name); | |
f3cdbe39 | 1606 | info->name = NULL; |
7c9e7a6f AG |
1607 | |
1608 | return ret; | |
1609 | } | |
1610 | ||
972c7f16 MC |
1611 | static bool tcmu_dev_configured(struct tcmu_dev *udev) |
1612 | { | |
1613 | return udev->uio_info.uio_dev ? true : false; | |
1614 | } | |
1615 | ||
7c9e7a6f | 1616 | static void tcmu_free_device(struct se_device *dev) |
92634706 MC |
1617 | { |
1618 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1619 | ||
1620 | /* release ref from init */ | |
1621 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
1622 | } | |
1623 | ||
1624 | static void tcmu_destroy_device(struct se_device *dev) | |
7c9e7a6f AG |
1625 | { |
1626 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
7c9e7a6f AG |
1627 | |
1628 | del_timer_sync(&udev->timeout); | |
1629 | ||
b6df4b79 XL |
1630 | mutex_lock(&root_udev_mutex); |
1631 | list_del(&udev->node); | |
1632 | mutex_unlock(&root_udev_mutex); | |
1633 | ||
531283ff | 1634 | tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); |
7c9e7a6f | 1635 | |
531283ff | 1636 | uio_unregister_device(&udev->uio_info); |
9260695d MC |
1637 | |
1638 | /* release ref from configure */ | |
1639 | kref_put(&udev->kref, tcmu_dev_kref_release); | |
7c9e7a6f AG |
1640 | } |
1641 | ||
1642 | enum { | |
3abaa2bf | 1643 | Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors, |
b849b456 | 1644 | Opt_nl_reply_supported, Opt_err, |
7c9e7a6f AG |
1645 | }; |
1646 | ||
1647 | static match_table_t tokens = { | |
1648 | {Opt_dev_config, "dev_config=%s"}, | |
1649 | {Opt_dev_size, "dev_size=%u"}, | |
9c1cd1b6 | 1650 | {Opt_hw_block_size, "hw_block_size=%u"}, |
3abaa2bf | 1651 | {Opt_hw_max_sectors, "hw_max_sectors=%u"}, |
b849b456 | 1652 | {Opt_nl_reply_supported, "nl_reply_supported=%d"}, |
7c9e7a6f AG |
1653 | {Opt_err, NULL} |
1654 | }; | |
1655 | ||
3abaa2bf MC |
1656 | static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib) |
1657 | { | |
1658 | unsigned long tmp_ul; | |
1659 | char *arg_p; | |
1660 | int ret; | |
1661 | ||
1662 | arg_p = match_strdup(arg); | |
1663 | if (!arg_p) | |
1664 | return -ENOMEM; | |
1665 | ||
1666 | ret = kstrtoul(arg_p, 0, &tmp_ul); | |
1667 | kfree(arg_p); | |
1668 | if (ret < 0) { | |
1669 | pr_err("kstrtoul() failed for dev attrib\n"); | |
1670 | return ret; | |
1671 | } | |
1672 | if (!tmp_ul) { | |
1673 | pr_err("dev attrib must be nonzero\n"); | |
1674 | return -EINVAL; | |
1675 | } | |
1676 | *dev_attrib = tmp_ul; | |
1677 | return 0; | |
1678 | } | |
1679 | ||
7c9e7a6f AG |
1680 | static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev, |
1681 | const char *page, ssize_t count) | |
1682 | { | |
1683 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1684 | char *orig, *ptr, *opts, *arg_p; | |
1685 | substring_t args[MAX_OPT_ARGS]; | |
1686 | int ret = 0, token; | |
7c9e7a6f AG |
1687 | |
1688 | opts = kstrdup(page, GFP_KERNEL); | |
1689 | if (!opts) | |
1690 | return -ENOMEM; | |
1691 | ||
1692 | orig = opts; | |
1693 | ||
1694 | while ((ptr = strsep(&opts, ",\n")) != NULL) { | |
1695 | if (!*ptr) | |
1696 | continue; | |
1697 | ||
1698 | token = match_token(ptr, tokens, args); | |
1699 | switch (token) { | |
1700 | case Opt_dev_config: | |
1701 | if (match_strlcpy(udev->dev_config, &args[0], | |
1702 | TCMU_CONFIG_LEN) == 0) { | |
1703 | ret = -EINVAL; | |
1704 | break; | |
1705 | } | |
1706 | pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config); | |
1707 | break; | |
1708 | case Opt_dev_size: | |
1709 | arg_p = match_strdup(&args[0]); | |
1710 | if (!arg_p) { | |
1711 | ret = -ENOMEM; | |
1712 | break; | |
1713 | } | |
1714 | ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size); | |
1715 | kfree(arg_p); | |
1716 | if (ret < 0) | |
1717 | pr_err("kstrtoul() failed for dev_size=\n"); | |
1718 | break; | |
9c1cd1b6 | 1719 | case Opt_hw_block_size: |
3abaa2bf MC |
1720 | ret = tcmu_set_dev_attrib(&args[0], |
1721 | &(dev->dev_attrib.hw_block_size)); | |
1722 | break; | |
1723 | case Opt_hw_max_sectors: | |
1724 | ret = tcmu_set_dev_attrib(&args[0], | |
1725 | &(dev->dev_attrib.hw_max_sectors)); | |
9c1cd1b6 | 1726 | break; |
b849b456 KN |
1727 | case Opt_nl_reply_supported: |
1728 | arg_p = match_strdup(&args[0]); | |
1729 | if (!arg_p) { | |
1730 | ret = -ENOMEM; | |
1731 | break; | |
1732 | } | |
16b93277 | 1733 | ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported); |
b849b456 KN |
1734 | kfree(arg_p); |
1735 | if (ret < 0) | |
16b93277 | 1736 | pr_err("kstrtoint() failed for nl_reply_supported=\n"); |
b849b456 | 1737 | break; |
7c9e7a6f AG |
1738 | default: |
1739 | break; | |
1740 | } | |
2579325c MC |
1741 | |
1742 | if (ret) | |
1743 | break; | |
7c9e7a6f AG |
1744 | } |
1745 | ||
1746 | kfree(orig); | |
1747 | return (!ret) ? count : ret; | |
1748 | } | |
1749 | ||
1750 | static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b) | |
1751 | { | |
1752 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1753 | ssize_t bl = 0; | |
1754 | ||
1755 | bl = sprintf(b + bl, "Config: %s ", | |
1756 | udev->dev_config[0] ? udev->dev_config : "NULL"); | |
7d7a7435 | 1757 | bl += sprintf(b + bl, "Size: %zu\n", udev->dev_size); |
7c9e7a6f AG |
1758 | |
1759 | return bl; | |
1760 | } | |
1761 | ||
1762 | static sector_t tcmu_get_blocks(struct se_device *dev) | |
1763 | { | |
1764 | struct tcmu_dev *udev = TCMU_DEV(dev); | |
1765 | ||
1766 | return div_u64(udev->dev_size - dev->dev_attrib.block_size, | |
1767 | dev->dev_attrib.block_size); | |
1768 | } | |
1769 | ||
7c9e7a6f | 1770 | static sense_reason_t |
9c1cd1b6 | 1771 | tcmu_parse_cdb(struct se_cmd *cmd) |
7c9e7a6f | 1772 | { |
02eb924f | 1773 | return passthrough_parse_cdb(cmd, tcmu_queue_cmd); |
7c9e7a6f AG |
1774 | } |
1775 | ||
7d7a7435 NB |
1776 | static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page) |
1777 | { | |
1778 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1779 | struct se_dev_attrib, da_group); | |
b5ab697c | 1780 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
7d7a7435 NB |
1781 | |
1782 | return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC); | |
1783 | } | |
1784 | ||
1785 | static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page, | |
1786 | size_t count) | |
1787 | { | |
1788 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1789 | struct se_dev_attrib, da_group); | |
1790 | struct tcmu_dev *udev = container_of(da->da_dev, | |
1791 | struct tcmu_dev, se_dev); | |
1792 | u32 val; | |
1793 | int ret; | |
1794 | ||
1795 | if (da->da_dev->export_count) { | |
1796 | pr_err("Unable to set tcmu cmd_time_out while exports exist\n"); | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | ||
1800 | ret = kstrtou32(page, 0, &val); | |
1801 | if (ret < 0) | |
1802 | return ret; | |
1803 | ||
7d7a7435 NB |
1804 | udev->cmd_time_out = val * MSEC_PER_SEC; |
1805 | return count; | |
1806 | } | |
1807 | CONFIGFS_ATTR(tcmu_, cmd_time_out); | |
1808 | ||
2d76443e | 1809 | static ssize_t tcmu_dev_config_show(struct config_item *item, char *page) |
ee018252 BL |
1810 | { |
1811 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1812 | struct se_dev_attrib, da_group); | |
1813 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1814 | ||
1815 | return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config); | |
1816 | } | |
1817 | ||
2d76443e MC |
1818 | static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page, |
1819 | size_t count) | |
ee018252 BL |
1820 | { |
1821 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1822 | struct se_dev_attrib, da_group); | |
1823 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1824 | int ret, len; |
ee018252 | 1825 | |
2d76443e MC |
1826 | len = strlen(page); |
1827 | if (!len || len > TCMU_CONFIG_LEN - 1) | |
ee018252 | 1828 | return -EINVAL; |
ee018252 BL |
1829 | |
1830 | /* Check if device has been configured before */ | |
1831 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1832 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1833 | TCMU_ATTR_DEV_CFG, page); |
ee018252 BL |
1834 | if (ret) { |
1835 | pr_err("Unable to reconfigure device\n"); | |
1836 | return ret; | |
1837 | } | |
de8c5221 BL |
1838 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
1839 | ||
1840 | ret = tcmu_update_uio_info(udev); | |
1841 | if (ret) | |
1842 | return ret; | |
1843 | return count; | |
ee018252 | 1844 | } |
2d76443e | 1845 | strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN); |
ee018252 BL |
1846 | |
1847 | return count; | |
1848 | } | |
2d76443e | 1849 | CONFIGFS_ATTR(tcmu_, dev_config); |
ee018252 | 1850 | |
801fc54d BL |
1851 | static ssize_t tcmu_dev_size_show(struct config_item *item, char *page) |
1852 | { | |
1853 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1854 | struct se_dev_attrib, da_group); | |
1855 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1856 | ||
1857 | return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size); | |
1858 | } | |
1859 | ||
1860 | static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page, | |
1861 | size_t count) | |
1862 | { | |
1863 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1864 | struct se_dev_attrib, da_group); | |
1865 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
2d76443e | 1866 | u64 val; |
801fc54d BL |
1867 | int ret; |
1868 | ||
2d76443e | 1869 | ret = kstrtou64(page, 0, &val); |
801fc54d BL |
1870 | if (ret < 0) |
1871 | return ret; | |
801fc54d BL |
1872 | |
1873 | /* Check if device has been configured before */ | |
1874 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1875 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1876 | TCMU_ATTR_DEV_SIZE, &val); |
801fc54d BL |
1877 | if (ret) { |
1878 | pr_err("Unable to reconfigure device\n"); | |
1879 | return ret; | |
1880 | } | |
1881 | } | |
2d76443e | 1882 | udev->dev_size = val; |
801fc54d BL |
1883 | return count; |
1884 | } | |
1885 | CONFIGFS_ATTR(tcmu_, dev_size); | |
1886 | ||
b849b456 KN |
1887 | static ssize_t tcmu_nl_reply_supported_show(struct config_item *item, |
1888 | char *page) | |
1889 | { | |
1890 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1891 | struct se_dev_attrib, da_group); | |
1892 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1893 | ||
1894 | return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported); | |
1895 | } | |
1896 | ||
1897 | static ssize_t tcmu_nl_reply_supported_store(struct config_item *item, | |
1898 | const char *page, size_t count) | |
1899 | { | |
1900 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1901 | struct se_dev_attrib, da_group); | |
1902 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); | |
1903 | s8 val; | |
1904 | int ret; | |
1905 | ||
1906 | ret = kstrtos8(page, 0, &val); | |
1907 | if (ret < 0) | |
1908 | return ret; | |
1909 | ||
1910 | udev->nl_reply_supported = val; | |
1911 | return count; | |
1912 | } | |
1913 | CONFIGFS_ATTR(tcmu_, nl_reply_supported); | |
1914 | ||
9a8bb606 BL |
1915 | static ssize_t tcmu_emulate_write_cache_show(struct config_item *item, |
1916 | char *page) | |
1917 | { | |
1918 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1919 | struct se_dev_attrib, da_group); | |
1920 | ||
1921 | return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache); | |
1922 | } | |
1923 | ||
1924 | static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, | |
1925 | const char *page, size_t count) | |
1926 | { | |
1927 | struct se_dev_attrib *da = container_of(to_config_group(item), | |
1928 | struct se_dev_attrib, da_group); | |
1068be7b | 1929 | struct tcmu_dev *udev = TCMU_DEV(da->da_dev); |
2d76443e | 1930 | u8 val; |
9a8bb606 BL |
1931 | int ret; |
1932 | ||
2d76443e | 1933 | ret = kstrtou8(page, 0, &val); |
9a8bb606 BL |
1934 | if (ret < 0) |
1935 | return ret; | |
1936 | ||
1068be7b BL |
1937 | /* Check if device has been configured before */ |
1938 | if (tcmu_dev_configured(udev)) { | |
b3af66e2 | 1939 | ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE, |
2d76443e | 1940 | TCMU_ATTR_WRITECACHE, &val); |
1068be7b BL |
1941 | if (ret) { |
1942 | pr_err("Unable to reconfigure device\n"); | |
1943 | return ret; | |
1944 | } | |
1945 | } | |
2d76443e MC |
1946 | |
1947 | da->emulate_write_cache = val; | |
9a8bb606 BL |
1948 | return count; |
1949 | } | |
1950 | CONFIGFS_ATTR(tcmu_, emulate_write_cache); | |
1951 | ||
5821783b | 1952 | static struct configfs_attribute *tcmu_attrib_attrs[] = { |
801fc54d | 1953 | &tcmu_attr_cmd_time_out, |
2d76443e | 1954 | &tcmu_attr_dev_config, |
801fc54d BL |
1955 | &tcmu_attr_dev_size, |
1956 | &tcmu_attr_emulate_write_cache, | |
b849b456 | 1957 | &tcmu_attr_nl_reply_supported, |
801fc54d BL |
1958 | NULL, |
1959 | }; | |
1960 | ||
7d7a7435 NB |
1961 | static struct configfs_attribute **tcmu_attrs; |
1962 | ||
1963 | static struct target_backend_ops tcmu_ops = { | |
7c9e7a6f | 1964 | .name = "user", |
7c9e7a6f | 1965 | .owner = THIS_MODULE, |
a3541703 | 1966 | .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, |
7c9e7a6f AG |
1967 | .attach_hba = tcmu_attach_hba, |
1968 | .detach_hba = tcmu_detach_hba, | |
1969 | .alloc_device = tcmu_alloc_device, | |
1970 | .configure_device = tcmu_configure_device, | |
92634706 | 1971 | .destroy_device = tcmu_destroy_device, |
7c9e7a6f AG |
1972 | .free_device = tcmu_free_device, |
1973 | .parse_cdb = tcmu_parse_cdb, | |
1974 | .set_configfs_dev_params = tcmu_set_configfs_dev_params, | |
1975 | .show_configfs_dev_params = tcmu_show_configfs_dev_params, | |
1976 | .get_device_type = sbc_get_device_type, | |
1977 | .get_blocks = tcmu_get_blocks, | |
7d7a7435 | 1978 | .tb_dev_attrib_attrs = NULL, |
7c9e7a6f AG |
1979 | }; |
1980 | ||
b6df4b79 XL |
1981 | static int unmap_thread_fn(void *data) |
1982 | { | |
1983 | struct tcmu_dev *udev; | |
1984 | loff_t off; | |
1985 | uint32_t start, end, block; | |
1986 | struct page *page; | |
1987 | int i; | |
1988 | ||
07932a02 | 1989 | while (!kthread_should_stop()) { |
b6df4b79 XL |
1990 | DEFINE_WAIT(__wait); |
1991 | ||
1992 | prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE); | |
1993 | schedule(); | |
1994 | finish_wait(&unmap_wait, &__wait); | |
1995 | ||
d906d8af MC |
1996 | if (kthread_should_stop()) |
1997 | break; | |
1998 | ||
b6df4b79 XL |
1999 | mutex_lock(&root_udev_mutex); |
2000 | list_for_each_entry(udev, &root_udev, node) { | |
2001 | mutex_lock(&udev->cmdr_lock); | |
2002 | ||
2003 | /* Try to complete the finished commands first */ | |
2004 | tcmu_handle_completions(udev); | |
2005 | ||
2006 | /* Skip the udevs waiting the global pool or in idle */ | |
2007 | if (udev->waiting_global || !udev->dbi_thresh) { | |
2008 | mutex_unlock(&udev->cmdr_lock); | |
2009 | continue; | |
2010 | } | |
2011 | ||
2012 | end = udev->dbi_max + 1; | |
2013 | block = find_last_bit(udev->data_bitmap, end); | |
2014 | if (block == udev->dbi_max) { | |
2015 | /* | |
2016 | * The last bit is dbi_max, so there is | |
2017 | * no need to shrink any blocks. | |
2018 | */ | |
2019 | mutex_unlock(&udev->cmdr_lock); | |
2020 | continue; | |
2021 | } else if (block == end) { | |
2022 | /* The current udev will goto idle state */ | |
2023 | udev->dbi_thresh = start = 0; | |
2024 | udev->dbi_max = 0; | |
2025 | } else { | |
2026 | udev->dbi_thresh = start = block + 1; | |
2027 | udev->dbi_max = block; | |
2028 | } | |
2029 | ||
2030 | /* Here will truncate the data area from off */ | |
2031 | off = udev->data_off + start * DATA_BLOCK_SIZE; | |
2032 | unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); | |
2033 | ||
2034 | /* Release the block pages */ | |
2035 | for (i = start; i < end; i++) { | |
2036 | page = radix_tree_delete(&udev->data_blocks, i); | |
2037 | if (page) { | |
2038 | __free_page(page); | |
2039 | atomic_dec(&global_db_count); | |
2040 | } | |
2041 | } | |
2042 | mutex_unlock(&udev->cmdr_lock); | |
2043 | } | |
2044 | ||
2045 | /* | |
2046 | * Try to wake up the udevs who are waiting | |
2047 | * for the global data pool. | |
2048 | */ | |
2049 | list_for_each_entry(udev, &root_udev, node) { | |
2050 | if (udev->waiting_global) | |
2051 | wake_up(&udev->wait_cmdr); | |
2052 | } | |
2053 | mutex_unlock(&root_udev_mutex); | |
2054 | } | |
2055 | ||
2056 | return 0; | |
2057 | } | |
2058 | ||
7c9e7a6f AG |
2059 | static int __init tcmu_module_init(void) |
2060 | { | |
801fc54d | 2061 | int ret, i, k, len = 0; |
7c9e7a6f AG |
2062 | |
2063 | BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0); | |
2064 | ||
2065 | tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache", | |
2066 | sizeof(struct tcmu_cmd), | |
2067 | __alignof__(struct tcmu_cmd), | |
2068 | 0, NULL); | |
2069 | if (!tcmu_cmd_cache) | |
2070 | return -ENOMEM; | |
2071 | ||
2072 | tcmu_root_device = root_device_register("tcm_user"); | |
2073 | if (IS_ERR(tcmu_root_device)) { | |
2074 | ret = PTR_ERR(tcmu_root_device); | |
2075 | goto out_free_cache; | |
2076 | } | |
2077 | ||
2078 | ret = genl_register_family(&tcmu_genl_family); | |
2079 | if (ret < 0) { | |
2080 | goto out_unreg_device; | |
2081 | } | |
2082 | ||
7d7a7435 NB |
2083 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { |
2084 | len += sizeof(struct configfs_attribute *); | |
2085 | } | |
801fc54d BL |
2086 | for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) { |
2087 | len += sizeof(struct configfs_attribute *); | |
2088 | } | |
2089 | len += sizeof(struct configfs_attribute *); | |
7d7a7435 NB |
2090 | |
2091 | tcmu_attrs = kzalloc(len, GFP_KERNEL); | |
2092 | if (!tcmu_attrs) { | |
2093 | ret = -ENOMEM; | |
2094 | goto out_unreg_genl; | |
2095 | } | |
2096 | ||
2097 | for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) { | |
2098 | tcmu_attrs[i] = passthrough_attrib_attrs[i]; | |
2099 | } | |
801fc54d BL |
2100 | for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) { |
2101 | tcmu_attrs[i] = tcmu_attrib_attrs[k]; | |
2102 | i++; | |
2103 | } | |
7d7a7435 NB |
2104 | tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs; |
2105 | ||
0a06d430 | 2106 | ret = transport_backend_register(&tcmu_ops); |
7c9e7a6f | 2107 | if (ret) |
7d7a7435 | 2108 | goto out_attrs; |
7c9e7a6f | 2109 | |
b6df4b79 XL |
2110 | init_waitqueue_head(&unmap_wait); |
2111 | unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap"); | |
2112 | if (IS_ERR(unmap_thread)) { | |
2113 | ret = PTR_ERR(unmap_thread); | |
2114 | goto out_unreg_transport; | |
2115 | } | |
2116 | ||
7c9e7a6f AG |
2117 | return 0; |
2118 | ||
b6df4b79 XL |
2119 | out_unreg_transport: |
2120 | target_backend_unregister(&tcmu_ops); | |
7d7a7435 NB |
2121 | out_attrs: |
2122 | kfree(tcmu_attrs); | |
7c9e7a6f AG |
2123 | out_unreg_genl: |
2124 | genl_unregister_family(&tcmu_genl_family); | |
2125 | out_unreg_device: | |
2126 | root_device_unregister(tcmu_root_device); | |
2127 | out_free_cache: | |
2128 | kmem_cache_destroy(tcmu_cmd_cache); | |
2129 | ||
2130 | return ret; | |
2131 | } | |
2132 | ||
2133 | static void __exit tcmu_module_exit(void) | |
2134 | { | |
b6df4b79 | 2135 | kthread_stop(unmap_thread); |
0a06d430 | 2136 | target_backend_unregister(&tcmu_ops); |
7d7a7435 | 2137 | kfree(tcmu_attrs); |
7c9e7a6f AG |
2138 | genl_unregister_family(&tcmu_genl_family); |
2139 | root_device_unregister(tcmu_root_device); | |
2140 | kmem_cache_destroy(tcmu_cmd_cache); | |
2141 | } | |
2142 | ||
2143 | MODULE_DESCRIPTION("TCM USER subsystem plugin"); | |
2144 | MODULE_AUTHOR("Shaohua Li <shli@kernel.org>"); | |
2145 | MODULE_AUTHOR("Andy Grover <agrover@redhat.com>"); | |
2146 | MODULE_LICENSE("GPL"); | |
2147 | ||
2148 | module_init(tcmu_module_init); | |
2149 | module_exit(tcmu_module_exit); |