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11fdf7f2 TL |
1 | /*- |
2 | * BSD LICENSE | |
3 | * | |
4 | * Copyright (c) Intel Corporation. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * * Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * * Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * * Neither the name of Intel Corporation nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #include "spdk/stdinc.h" | |
35 | ||
9f95a23c TL |
36 | #include "spdk/env.h" |
37 | #include "spdk/queue.h" | |
11fdf7f2 TL |
38 | #include "spdk/string.h" |
39 | #include "spdk/thread.h" | |
9f95a23c | 40 | #include "spdk/util.h" |
11fdf7f2 TL |
41 | |
42 | #include "spdk_internal/log.h" | |
9f95a23c | 43 | #include "spdk_internal/thread.h" |
11fdf7f2 | 44 | |
9f95a23c | 45 | #define SPDK_MSG_BATCH_SIZE 8 |
11fdf7f2 TL |
46 | |
47 | static pthread_mutex_t g_devlist_mutex = PTHREAD_MUTEX_INITIALIZER; | |
48 | ||
9f95a23c TL |
49 | static spdk_new_thread_fn g_new_thread_fn = NULL; |
50 | static size_t g_ctx_sz = 0; | |
51 | ||
11fdf7f2 TL |
52 | struct io_device { |
53 | void *io_device; | |
54 | char *name; | |
55 | spdk_io_channel_create_cb create_cb; | |
56 | spdk_io_channel_destroy_cb destroy_cb; | |
57 | spdk_io_device_unregister_cb unregister_cb; | |
58 | struct spdk_thread *unregister_thread; | |
59 | uint32_t ctx_size; | |
60 | uint32_t for_each_count; | |
61 | TAILQ_ENTRY(io_device) tailq; | |
62 | ||
63 | uint32_t refcnt; | |
64 | ||
65 | bool unregistered; | |
66 | }; | |
67 | ||
68 | static TAILQ_HEAD(, io_device) g_io_devices = TAILQ_HEAD_INITIALIZER(g_io_devices); | |
69 | ||
9f95a23c TL |
70 | struct spdk_msg { |
71 | spdk_msg_fn fn; | |
72 | void *arg; | |
73 | ||
74 | SLIST_ENTRY(spdk_msg) link; | |
75 | }; | |
76 | ||
77 | #define SPDK_MSG_MEMPOOL_CACHE_SIZE 1024 | |
78 | static struct spdk_mempool *g_spdk_msg_mempool = NULL; | |
79 | ||
80 | enum spdk_poller_state { | |
81 | /* The poller is registered with a thread but not currently executing its fn. */ | |
82 | SPDK_POLLER_STATE_WAITING, | |
83 | ||
84 | /* The poller is currently running its fn. */ | |
85 | SPDK_POLLER_STATE_RUNNING, | |
86 | ||
87 | /* The poller was unregistered during the execution of its fn. */ | |
88 | SPDK_POLLER_STATE_UNREGISTERED, | |
89 | }; | |
90 | ||
91 | struct spdk_poller { | |
92 | TAILQ_ENTRY(spdk_poller) tailq; | |
93 | ||
94 | /* Current state of the poller; should only be accessed from the poller's thread. */ | |
95 | enum spdk_poller_state state; | |
96 | ||
97 | uint64_t period_ticks; | |
98 | uint64_t next_run_tick; | |
99 | spdk_poller_fn fn; | |
100 | void *arg; | |
101 | }; | |
102 | ||
11fdf7f2 | 103 | struct spdk_thread { |
11fdf7f2 TL |
104 | TAILQ_HEAD(, spdk_io_channel) io_channels; |
105 | TAILQ_ENTRY(spdk_thread) tailq; | |
106 | char *name; | |
9f95a23c TL |
107 | |
108 | bool exit; | |
109 | ||
110 | struct spdk_cpuset *cpumask; | |
111 | ||
112 | uint64_t tsc_last; | |
113 | struct spdk_thread_stats stats; | |
114 | ||
115 | /* | |
116 | * Contains pollers actively running on this thread. Pollers | |
117 | * are run round-robin. The thread takes one poller from the head | |
118 | * of the ring, executes it, then puts it back at the tail of | |
119 | * the ring. | |
120 | */ | |
121 | TAILQ_HEAD(active_pollers_head, spdk_poller) active_pollers; | |
122 | ||
123 | /** | |
124 | * Contains pollers running on this thread with a periodic timer. | |
125 | */ | |
126 | TAILQ_HEAD(timer_pollers_head, spdk_poller) timer_pollers; | |
127 | ||
128 | struct spdk_ring *messages; | |
129 | ||
130 | SLIST_HEAD(, spdk_msg) msg_cache; | |
131 | size_t msg_cache_count; | |
132 | ||
133 | /* User context allocated at the end */ | |
134 | uint8_t ctx[0]; | |
11fdf7f2 TL |
135 | }; |
136 | ||
137 | static TAILQ_HEAD(, spdk_thread) g_threads = TAILQ_HEAD_INITIALIZER(g_threads); | |
138 | static uint32_t g_thread_count = 0; | |
139 | ||
9f95a23c TL |
140 | static __thread struct spdk_thread *tls_thread = NULL; |
141 | ||
142 | static inline struct spdk_thread * | |
11fdf7f2 TL |
143 | _get_thread(void) |
144 | { | |
9f95a23c TL |
145 | return tls_thread; |
146 | } | |
11fdf7f2 | 147 | |
9f95a23c TL |
148 | int |
149 | spdk_thread_lib_init(spdk_new_thread_fn new_thread_fn, size_t ctx_sz) | |
150 | { | |
151 | char mempool_name[SPDK_MAX_MEMZONE_NAME_LEN]; | |
11fdf7f2 | 152 | |
9f95a23c TL |
153 | assert(g_new_thread_fn == NULL); |
154 | g_new_thread_fn = new_thread_fn; | |
11fdf7f2 | 155 | |
9f95a23c | 156 | g_ctx_sz = ctx_sz; |
11fdf7f2 | 157 | |
9f95a23c TL |
158 | snprintf(mempool_name, sizeof(mempool_name), "msgpool_%d", getpid()); |
159 | g_spdk_msg_mempool = spdk_mempool_create(mempool_name, | |
160 | 262144 - 1, /* Power of 2 minus 1 is optimal for memory consumption */ | |
161 | sizeof(struct spdk_msg), | |
162 | 0, /* No cache. We do our own. */ | |
163 | SPDK_ENV_SOCKET_ID_ANY); | |
164 | ||
165 | if (!g_spdk_msg_mempool) { | |
166 | return -1; | |
167 | } | |
11fdf7f2 | 168 | |
11fdf7f2 TL |
169 | return 0; |
170 | } | |
171 | ||
172 | void | |
173 | spdk_thread_lib_fini(void) | |
174 | { | |
9f95a23c TL |
175 | struct io_device *dev; |
176 | ||
177 | TAILQ_FOREACH(dev, &g_io_devices, tailq) { | |
178 | SPDK_ERRLOG("io_device %s not unregistered\n", dev->name); | |
179 | } | |
180 | ||
181 | if (g_spdk_msg_mempool) { | |
182 | spdk_mempool_free(g_spdk_msg_mempool); | |
183 | g_spdk_msg_mempool = NULL; | |
184 | } | |
185 | ||
186 | g_new_thread_fn = NULL; | |
187 | g_ctx_sz = 0; | |
11fdf7f2 TL |
188 | } |
189 | ||
9f95a23c TL |
190 | static void |
191 | _free_thread(struct spdk_thread *thread) | |
11fdf7f2 | 192 | { |
9f95a23c TL |
193 | struct spdk_io_channel *ch; |
194 | struct spdk_msg *msg; | |
195 | struct spdk_poller *poller, *ptmp; | |
196 | ||
197 | TAILQ_FOREACH(ch, &thread->io_channels, tailq) { | |
198 | SPDK_ERRLOG("thread %s still has channel for io_device %s\n", | |
199 | thread->name, ch->dev->name); | |
200 | } | |
201 | ||
202 | TAILQ_FOREACH_SAFE(poller, &thread->active_pollers, tailq, ptmp) { | |
203 | if (poller->state == SPDK_POLLER_STATE_WAITING) { | |
204 | SPDK_WARNLOG("poller %p still registered at thread exit\n", | |
205 | poller); | |
206 | } | |
207 | ||
208 | TAILQ_REMOVE(&thread->active_pollers, poller, tailq); | |
209 | free(poller); | |
210 | } | |
211 | ||
212 | ||
213 | TAILQ_FOREACH_SAFE(poller, &thread->timer_pollers, tailq, ptmp) { | |
214 | if (poller->state == SPDK_POLLER_STATE_WAITING) { | |
215 | SPDK_WARNLOG("poller %p still registered at thread exit\n", | |
216 | poller); | |
217 | } | |
218 | ||
219 | TAILQ_REMOVE(&thread->timer_pollers, poller, tailq); | |
220 | free(poller); | |
221 | } | |
11fdf7f2 TL |
222 | |
223 | pthread_mutex_lock(&g_devlist_mutex); | |
9f95a23c TL |
224 | assert(g_thread_count > 0); |
225 | g_thread_count--; | |
226 | TAILQ_REMOVE(&g_threads, thread, tailq); | |
227 | pthread_mutex_unlock(&g_devlist_mutex); | |
11fdf7f2 | 228 | |
9f95a23c TL |
229 | spdk_cpuset_free(thread->cpumask); |
230 | free(thread->name); | |
231 | ||
232 | msg = SLIST_FIRST(&thread->msg_cache); | |
233 | while (msg != NULL) { | |
234 | SLIST_REMOVE_HEAD(&thread->msg_cache, link); | |
235 | ||
236 | assert(thread->msg_cache_count > 0); | |
237 | thread->msg_cache_count--; | |
238 | spdk_mempool_put(g_spdk_msg_mempool, msg); | |
239 | ||
240 | msg = SLIST_FIRST(&thread->msg_cache); | |
11fdf7f2 TL |
241 | } |
242 | ||
9f95a23c TL |
243 | assert(thread->msg_cache_count == 0); |
244 | ||
245 | spdk_ring_free(thread->messages); | |
246 | free(thread); | |
247 | } | |
248 | ||
249 | struct spdk_thread * | |
250 | spdk_thread_create(const char *name, struct spdk_cpuset *cpumask) | |
251 | { | |
252 | struct spdk_thread *thread; | |
253 | struct spdk_msg *msgs[SPDK_MSG_MEMPOOL_CACHE_SIZE]; | |
254 | int rc, i; | |
255 | ||
256 | thread = calloc(1, sizeof(*thread) + g_ctx_sz); | |
11fdf7f2 TL |
257 | if (!thread) { |
258 | SPDK_ERRLOG("Unable to allocate memory for thread\n"); | |
11fdf7f2 TL |
259 | return NULL; |
260 | } | |
261 | ||
9f95a23c TL |
262 | thread->cpumask = spdk_cpuset_alloc(); |
263 | if (!thread->cpumask) { | |
264 | free(thread); | |
265 | SPDK_ERRLOG("Unable to allocate memory for CPU mask\n"); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | if (cpumask) { | |
270 | spdk_cpuset_copy(thread->cpumask, cpumask); | |
271 | } else { | |
272 | spdk_cpuset_negate(thread->cpumask); | |
273 | } | |
274 | ||
11fdf7f2 | 275 | TAILQ_INIT(&thread->io_channels); |
9f95a23c TL |
276 | TAILQ_INIT(&thread->active_pollers); |
277 | TAILQ_INIT(&thread->timer_pollers); | |
278 | SLIST_INIT(&thread->msg_cache); | |
279 | thread->msg_cache_count = 0; | |
280 | ||
281 | thread->tsc_last = spdk_get_ticks(); | |
282 | ||
283 | thread->messages = spdk_ring_create(SPDK_RING_TYPE_MP_SC, 65536, SPDK_ENV_SOCKET_ID_ANY); | |
284 | if (!thread->messages) { | |
285 | SPDK_ERRLOG("Unable to allocate memory for message ring\n"); | |
286 | spdk_cpuset_free(thread->cpumask); | |
287 | free(thread); | |
288 | return NULL; | |
289 | } | |
290 | ||
291 | /* Fill the local message pool cache. */ | |
292 | rc = spdk_mempool_get_bulk(g_spdk_msg_mempool, (void **)msgs, SPDK_MSG_MEMPOOL_CACHE_SIZE); | |
293 | if (rc == 0) { | |
294 | /* If we can't populate the cache it's ok. The cache will get filled | |
295 | * up organically as messages are passed to the thread. */ | |
296 | for (i = 0; i < SPDK_MSG_MEMPOOL_CACHE_SIZE; i++) { | |
297 | SLIST_INSERT_HEAD(&thread->msg_cache, msgs[i], link); | |
298 | thread->msg_cache_count++; | |
299 | } | |
300 | } | |
301 | ||
11fdf7f2 | 302 | if (name) { |
11fdf7f2 TL |
303 | thread->name = strdup(name); |
304 | } else { | |
305 | thread->name = spdk_sprintf_alloc("%p", thread); | |
306 | } | |
307 | ||
308 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Allocating new thread %s\n", thread->name); | |
309 | ||
9f95a23c TL |
310 | pthread_mutex_lock(&g_devlist_mutex); |
311 | TAILQ_INSERT_TAIL(&g_threads, thread, tailq); | |
312 | g_thread_count++; | |
11fdf7f2 TL |
313 | pthread_mutex_unlock(&g_devlist_mutex); |
314 | ||
9f95a23c TL |
315 | if (g_new_thread_fn) { |
316 | rc = g_new_thread_fn(thread); | |
317 | if (rc != 0) { | |
318 | _free_thread(thread); | |
319 | return NULL; | |
320 | } | |
321 | } | |
322 | ||
11fdf7f2 TL |
323 | return thread; |
324 | } | |
325 | ||
326 | void | |
9f95a23c | 327 | spdk_set_thread(struct spdk_thread *thread) |
11fdf7f2 | 328 | { |
9f95a23c TL |
329 | tls_thread = thread; |
330 | } | |
11fdf7f2 | 331 | |
9f95a23c TL |
332 | void |
333 | spdk_thread_exit(struct spdk_thread *thread) | |
334 | { | |
335 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Exit thread %s\n", thread->name); | |
11fdf7f2 | 336 | |
9f95a23c TL |
337 | assert(tls_thread == thread); |
338 | ||
339 | thread->exit = true; | |
340 | } | |
341 | ||
342 | void | |
343 | spdk_thread_destroy(struct spdk_thread *thread) | |
344 | { | |
345 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Destroy thread %s\n", thread->name); | |
346 | ||
347 | assert(thread->exit == true); | |
348 | ||
349 | if (tls_thread == thread) { | |
350 | tls_thread = NULL; | |
11fdf7f2 TL |
351 | } |
352 | ||
9f95a23c TL |
353 | _free_thread(thread); |
354 | } | |
11fdf7f2 | 355 | |
9f95a23c TL |
356 | void * |
357 | spdk_thread_get_ctx(struct spdk_thread *thread) | |
358 | { | |
359 | if (g_ctx_sz > 0) { | |
360 | return thread->ctx; | |
361 | } | |
11fdf7f2 | 362 | |
9f95a23c TL |
363 | return NULL; |
364 | } | |
365 | ||
366 | struct spdk_cpuset * | |
367 | spdk_thread_get_cpumask(struct spdk_thread *thread) | |
368 | { | |
369 | return thread->cpumask; | |
370 | } | |
371 | ||
372 | struct spdk_thread * | |
373 | spdk_thread_get_from_ctx(void *ctx) | |
374 | { | |
375 | if (ctx == NULL) { | |
376 | assert(false); | |
377 | return NULL; | |
378 | } | |
379 | ||
380 | assert(g_ctx_sz > 0); | |
381 | ||
382 | return SPDK_CONTAINEROF(ctx, struct spdk_thread, ctx); | |
383 | } | |
384 | ||
385 | static inline uint32_t | |
386 | _spdk_msg_queue_run_batch(struct spdk_thread *thread, uint32_t max_msgs) | |
387 | { | |
388 | unsigned count, i; | |
389 | void *messages[SPDK_MSG_BATCH_SIZE]; | |
390 | ||
391 | #ifdef DEBUG | |
392 | /* | |
393 | * spdk_ring_dequeue() fills messages and returns how many entries it wrote, | |
394 | * so we will never actually read uninitialized data from events, but just to be sure | |
395 | * (and to silence a static analyzer false positive), initialize the array to NULL pointers. | |
396 | */ | |
397 | memset(messages, 0, sizeof(messages)); | |
398 | #endif | |
399 | ||
400 | if (max_msgs > 0) { | |
401 | max_msgs = spdk_min(max_msgs, SPDK_MSG_BATCH_SIZE); | |
402 | } else { | |
403 | max_msgs = SPDK_MSG_BATCH_SIZE; | |
404 | } | |
405 | ||
406 | count = spdk_ring_dequeue(thread->messages, messages, max_msgs); | |
407 | if (count == 0) { | |
408 | return 0; | |
409 | } | |
410 | ||
411 | for (i = 0; i < count; i++) { | |
412 | struct spdk_msg *msg = messages[i]; | |
413 | ||
414 | assert(msg != NULL); | |
415 | msg->fn(msg->arg); | |
416 | ||
417 | if (thread->exit) { | |
418 | break; | |
419 | } | |
420 | ||
421 | if (thread->msg_cache_count < SPDK_MSG_MEMPOOL_CACHE_SIZE) { | |
422 | /* Insert the messages at the head. We want to re-use the hot | |
423 | * ones. */ | |
424 | SLIST_INSERT_HEAD(&thread->msg_cache, msg, link); | |
425 | thread->msg_cache_count++; | |
426 | } else { | |
427 | spdk_mempool_put(g_spdk_msg_mempool, msg); | |
428 | } | |
429 | } | |
430 | ||
431 | return count; | |
432 | } | |
433 | ||
434 | static void | |
435 | _spdk_poller_insert_timer(struct spdk_thread *thread, struct spdk_poller *poller, uint64_t now) | |
436 | { | |
437 | struct spdk_poller *iter; | |
438 | ||
439 | poller->next_run_tick = now + poller->period_ticks; | |
440 | ||
441 | /* | |
442 | * Insert poller in the thread's timer_pollers list in sorted order by next scheduled | |
443 | * run time. | |
444 | */ | |
445 | TAILQ_FOREACH_REVERSE(iter, &thread->timer_pollers, timer_pollers_head, tailq) { | |
446 | if (iter->next_run_tick <= poller->next_run_tick) { | |
447 | TAILQ_INSERT_AFTER(&thread->timer_pollers, iter, poller, tailq); | |
448 | return; | |
449 | } | |
450 | } | |
451 | ||
452 | /* No earlier pollers were found, so this poller must be the new head */ | |
453 | TAILQ_INSERT_HEAD(&thread->timer_pollers, poller, tailq); | |
454 | } | |
455 | ||
456 | int | |
457 | spdk_thread_poll(struct spdk_thread *thread, uint32_t max_msgs, uint64_t now) | |
458 | { | |
459 | uint32_t msg_count; | |
460 | struct spdk_thread *orig_thread; | |
461 | struct spdk_poller *poller, *tmp; | |
462 | int rc = 0; | |
463 | ||
464 | orig_thread = _get_thread(); | |
465 | tls_thread = thread; | |
466 | ||
467 | if (now == 0) { | |
468 | now = spdk_get_ticks(); | |
469 | } | |
470 | ||
471 | msg_count = _spdk_msg_queue_run_batch(thread, max_msgs); | |
472 | if (msg_count) { | |
473 | rc = 1; | |
474 | } | |
475 | ||
476 | TAILQ_FOREACH_REVERSE_SAFE(poller, &thread->active_pollers, | |
477 | active_pollers_head, tailq, tmp) { | |
478 | int poller_rc; | |
479 | ||
480 | if (thread->exit) { | |
481 | break; | |
482 | } | |
483 | ||
484 | if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) { | |
485 | TAILQ_REMOVE(&thread->active_pollers, poller, tailq); | |
486 | free(poller); | |
487 | continue; | |
488 | } | |
489 | ||
490 | poller->state = SPDK_POLLER_STATE_RUNNING; | |
491 | poller_rc = poller->fn(poller->arg); | |
492 | ||
493 | if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) { | |
494 | TAILQ_REMOVE(&thread->active_pollers, poller, tailq); | |
495 | free(poller); | |
496 | continue; | |
497 | } | |
498 | ||
499 | poller->state = SPDK_POLLER_STATE_WAITING; | |
500 | ||
501 | #ifdef DEBUG | |
502 | if (poller_rc == -1) { | |
503 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Poller %p returned -1\n", poller); | |
504 | } | |
505 | #endif | |
506 | ||
507 | if (poller_rc > rc) { | |
508 | rc = poller_rc; | |
509 | } | |
510 | ||
511 | } | |
512 | ||
513 | TAILQ_FOREACH_SAFE(poller, &thread->timer_pollers, tailq, tmp) { | |
514 | int timer_rc = 0; | |
515 | ||
516 | if (thread->exit) { | |
517 | break; | |
518 | } | |
519 | ||
520 | if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) { | |
521 | TAILQ_REMOVE(&thread->timer_pollers, poller, tailq); | |
522 | free(poller); | |
523 | continue; | |
524 | } | |
525 | ||
526 | if (now < poller->next_run_tick) { | |
527 | break; | |
528 | } | |
529 | ||
530 | poller->state = SPDK_POLLER_STATE_RUNNING; | |
531 | timer_rc = poller->fn(poller->arg); | |
532 | ||
533 | if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) { | |
534 | TAILQ_REMOVE(&thread->timer_pollers, poller, tailq); | |
535 | free(poller); | |
536 | continue; | |
537 | } | |
538 | ||
539 | poller->state = SPDK_POLLER_STATE_WAITING; | |
540 | TAILQ_REMOVE(&thread->timer_pollers, poller, tailq); | |
541 | _spdk_poller_insert_timer(thread, poller, now); | |
542 | ||
543 | #ifdef DEBUG | |
544 | if (timer_rc == -1) { | |
545 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Timed poller %p returned -1\n", poller); | |
546 | } | |
547 | #endif | |
548 | ||
549 | if (timer_rc > rc) { | |
550 | rc = timer_rc; | |
551 | ||
552 | } | |
553 | } | |
554 | ||
555 | if (rc == 0) { | |
556 | /* Poller status idle */ | |
557 | thread->stats.idle_tsc += now - thread->tsc_last; | |
558 | } else if (rc > 0) { | |
559 | /* Poller status busy */ | |
560 | thread->stats.busy_tsc += now - thread->tsc_last; | |
561 | } | |
562 | thread->tsc_last = now; | |
563 | ||
564 | tls_thread = orig_thread; | |
565 | ||
566 | return rc; | |
567 | } | |
568 | ||
569 | uint64_t | |
570 | spdk_thread_next_poller_expiration(struct spdk_thread *thread) | |
571 | { | |
572 | struct spdk_poller *poller; | |
573 | ||
574 | poller = TAILQ_FIRST(&thread->timer_pollers); | |
575 | if (poller) { | |
576 | return poller->next_run_tick; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | int | |
583 | spdk_thread_has_active_pollers(struct spdk_thread *thread) | |
584 | { | |
585 | return !TAILQ_EMPTY(&thread->active_pollers); | |
586 | } | |
587 | ||
588 | bool | |
589 | spdk_thread_has_pollers(struct spdk_thread *thread) | |
590 | { | |
591 | if (TAILQ_EMPTY(&thread->active_pollers) && | |
592 | TAILQ_EMPTY(&thread->timer_pollers)) { | |
593 | return false; | |
594 | } | |
595 | ||
596 | return true; | |
597 | } | |
598 | ||
599 | bool | |
600 | spdk_thread_is_idle(struct spdk_thread *thread) | |
601 | { | |
602 | if (spdk_ring_count(thread->messages) || | |
603 | spdk_thread_has_pollers(thread)) { | |
604 | return false; | |
605 | } | |
606 | ||
607 | return true; | |
11fdf7f2 TL |
608 | } |
609 | ||
610 | uint32_t | |
611 | spdk_thread_get_count(void) | |
612 | { | |
613 | /* | |
614 | * Return cached value of the current thread count. We could acquire the | |
615 | * lock and iterate through the TAILQ of threads to count them, but that | |
616 | * count could still be invalidated after we release the lock. | |
617 | */ | |
618 | return g_thread_count; | |
619 | } | |
620 | ||
621 | struct spdk_thread * | |
622 | spdk_get_thread(void) | |
623 | { | |
624 | struct spdk_thread *thread; | |
625 | ||
11fdf7f2 TL |
626 | thread = _get_thread(); |
627 | if (!thread) { | |
628 | SPDK_ERRLOG("No thread allocated\n"); | |
629 | } | |
630 | ||
11fdf7f2 TL |
631 | return thread; |
632 | } | |
633 | ||
634 | const char * | |
635 | spdk_thread_get_name(const struct spdk_thread *thread) | |
636 | { | |
637 | return thread->name; | |
638 | } | |
639 | ||
9f95a23c TL |
640 | int |
641 | spdk_thread_get_stats(struct spdk_thread_stats *stats) | |
11fdf7f2 | 642 | { |
9f95a23c TL |
643 | struct spdk_thread *thread; |
644 | ||
645 | thread = _get_thread(); | |
646 | if (!thread) { | |
647 | SPDK_ERRLOG("No thread allocated\n"); | |
648 | return -EINVAL; | |
649 | } | |
650 | ||
651 | if (stats == NULL) { | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | *stats = thread->stats; | |
656 | ||
657 | return 0; | |
11fdf7f2 TL |
658 | } |
659 | ||
9f95a23c TL |
660 | void |
661 | spdk_thread_send_msg(const struct spdk_thread *thread, spdk_msg_fn fn, void *ctx) | |
662 | { | |
663 | struct spdk_thread *local_thread; | |
664 | struct spdk_msg *msg; | |
665 | int rc; | |
666 | ||
667 | if (!thread) { | |
668 | assert(false); | |
669 | return; | |
670 | } | |
671 | ||
672 | local_thread = _get_thread(); | |
673 | ||
674 | msg = NULL; | |
675 | if (local_thread != NULL) { | |
676 | if (local_thread->msg_cache_count > 0) { | |
677 | msg = SLIST_FIRST(&local_thread->msg_cache); | |
678 | assert(msg != NULL); | |
679 | SLIST_REMOVE_HEAD(&local_thread->msg_cache, link); | |
680 | local_thread->msg_cache_count--; | |
681 | } | |
682 | } | |
683 | ||
684 | if (msg == NULL) { | |
685 | msg = spdk_mempool_get(g_spdk_msg_mempool); | |
686 | if (!msg) { | |
687 | assert(false); | |
688 | return; | |
689 | } | |
690 | } | |
691 | ||
692 | msg->fn = fn; | |
693 | msg->arg = ctx; | |
694 | ||
695 | rc = spdk_ring_enqueue(thread->messages, (void **)&msg, 1, NULL); | |
696 | if (rc != 1) { | |
697 | assert(false); | |
698 | spdk_mempool_put(g_spdk_msg_mempool, msg); | |
699 | return; | |
700 | } | |
701 | } | |
11fdf7f2 TL |
702 | |
703 | struct spdk_poller * | |
704 | spdk_poller_register(spdk_poller_fn fn, | |
705 | void *arg, | |
706 | uint64_t period_microseconds) | |
707 | { | |
708 | struct spdk_thread *thread; | |
709 | struct spdk_poller *poller; | |
9f95a23c | 710 | uint64_t quotient, remainder, ticks; |
11fdf7f2 TL |
711 | |
712 | thread = spdk_get_thread(); | |
713 | if (!thread) { | |
714 | assert(false); | |
715 | return NULL; | |
716 | } | |
717 | ||
9f95a23c TL |
718 | poller = calloc(1, sizeof(*poller)); |
719 | if (poller == NULL) { | |
720 | SPDK_ERRLOG("Poller memory allocation failed\n"); | |
11fdf7f2 TL |
721 | return NULL; |
722 | } | |
723 | ||
9f95a23c TL |
724 | poller->state = SPDK_POLLER_STATE_WAITING; |
725 | poller->fn = fn; | |
726 | poller->arg = arg; | |
727 | ||
728 | if (period_microseconds) { | |
729 | quotient = period_microseconds / SPDK_SEC_TO_USEC; | |
730 | remainder = period_microseconds % SPDK_SEC_TO_USEC; | |
731 | ticks = spdk_get_ticks_hz(); | |
732 | ||
733 | poller->period_ticks = ticks * quotient + (ticks * remainder) / SPDK_SEC_TO_USEC; | |
734 | } else { | |
735 | poller->period_ticks = 0; | |
736 | } | |
737 | ||
738 | if (poller->period_ticks) { | |
739 | _spdk_poller_insert_timer(thread, poller, spdk_get_ticks()); | |
740 | } else { | |
741 | TAILQ_INSERT_TAIL(&thread->active_pollers, poller, tailq); | |
11fdf7f2 TL |
742 | } |
743 | ||
744 | return poller; | |
745 | } | |
746 | ||
747 | void | |
748 | spdk_poller_unregister(struct spdk_poller **ppoller) | |
749 | { | |
750 | struct spdk_thread *thread; | |
751 | struct spdk_poller *poller; | |
752 | ||
753 | poller = *ppoller; | |
754 | if (poller == NULL) { | |
755 | return; | |
756 | } | |
757 | ||
758 | *ppoller = NULL; | |
759 | ||
760 | thread = spdk_get_thread(); | |
9f95a23c TL |
761 | if (!thread) { |
762 | assert(false); | |
763 | return; | |
11fdf7f2 | 764 | } |
9f95a23c TL |
765 | |
766 | /* Simply set the state to unregistered. The poller will get cleaned up | |
767 | * in a subsequent call to spdk_thread_poll(). | |
768 | */ | |
769 | poller->state = SPDK_POLLER_STATE_UNREGISTERED; | |
11fdf7f2 TL |
770 | } |
771 | ||
772 | struct call_thread { | |
773 | struct spdk_thread *cur_thread; | |
9f95a23c | 774 | spdk_msg_fn fn; |
11fdf7f2 TL |
775 | void *ctx; |
776 | ||
777 | struct spdk_thread *orig_thread; | |
9f95a23c | 778 | spdk_msg_fn cpl; |
11fdf7f2 TL |
779 | }; |
780 | ||
781 | static void | |
782 | spdk_on_thread(void *ctx) | |
783 | { | |
784 | struct call_thread *ct = ctx; | |
785 | ||
786 | ct->fn(ct->ctx); | |
787 | ||
788 | pthread_mutex_lock(&g_devlist_mutex); | |
789 | ct->cur_thread = TAILQ_NEXT(ct->cur_thread, tailq); | |
790 | pthread_mutex_unlock(&g_devlist_mutex); | |
791 | ||
792 | if (!ct->cur_thread) { | |
793 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Completed thread iteration\n"); | |
794 | ||
795 | spdk_thread_send_msg(ct->orig_thread, ct->cpl, ct->ctx); | |
796 | free(ctx); | |
797 | } else { | |
798 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Continuing thread iteration to %s\n", | |
799 | ct->cur_thread->name); | |
800 | ||
801 | spdk_thread_send_msg(ct->cur_thread, spdk_on_thread, ctx); | |
802 | } | |
803 | } | |
804 | ||
805 | void | |
9f95a23c | 806 | spdk_for_each_thread(spdk_msg_fn fn, void *ctx, spdk_msg_fn cpl) |
11fdf7f2 TL |
807 | { |
808 | struct call_thread *ct; | |
9f95a23c | 809 | struct spdk_thread *thread; |
11fdf7f2 TL |
810 | |
811 | ct = calloc(1, sizeof(*ct)); | |
812 | if (!ct) { | |
813 | SPDK_ERRLOG("Unable to perform thread iteration\n"); | |
814 | cpl(ctx); | |
815 | return; | |
816 | } | |
817 | ||
818 | ct->fn = fn; | |
819 | ct->ctx = ctx; | |
820 | ct->cpl = cpl; | |
821 | ||
9f95a23c TL |
822 | thread = _get_thread(); |
823 | if (!thread) { | |
824 | SPDK_ERRLOG("No thread allocated\n"); | |
825 | free(ct); | |
826 | cpl(ctx); | |
827 | return; | |
828 | } | |
829 | ct->orig_thread = thread; | |
830 | ||
11fdf7f2 | 831 | pthread_mutex_lock(&g_devlist_mutex); |
11fdf7f2 TL |
832 | ct->cur_thread = TAILQ_FIRST(&g_threads); |
833 | pthread_mutex_unlock(&g_devlist_mutex); | |
834 | ||
835 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Starting thread iteration from %s\n", | |
836 | ct->orig_thread->name); | |
837 | ||
838 | spdk_thread_send_msg(ct->cur_thread, spdk_on_thread, ct); | |
839 | } | |
840 | ||
841 | void | |
842 | spdk_io_device_register(void *io_device, spdk_io_channel_create_cb create_cb, | |
843 | spdk_io_channel_destroy_cb destroy_cb, uint32_t ctx_size, | |
844 | const char *name) | |
845 | { | |
846 | struct io_device *dev, *tmp; | |
9f95a23c | 847 | struct spdk_thread *thread; |
11fdf7f2 TL |
848 | |
849 | assert(io_device != NULL); | |
850 | assert(create_cb != NULL); | |
851 | assert(destroy_cb != NULL); | |
852 | ||
9f95a23c TL |
853 | thread = spdk_get_thread(); |
854 | if (!thread) { | |
855 | SPDK_ERRLOG("%s called from non-SPDK thread\n", __func__); | |
856 | assert(false); | |
857 | return; | |
858 | } | |
859 | ||
11fdf7f2 TL |
860 | dev = calloc(1, sizeof(struct io_device)); |
861 | if (dev == NULL) { | |
862 | SPDK_ERRLOG("could not allocate io_device\n"); | |
863 | return; | |
864 | } | |
865 | ||
866 | dev->io_device = io_device; | |
867 | if (name) { | |
868 | dev->name = strdup(name); | |
869 | } else { | |
870 | dev->name = spdk_sprintf_alloc("%p", dev); | |
871 | } | |
872 | dev->create_cb = create_cb; | |
873 | dev->destroy_cb = destroy_cb; | |
874 | dev->unregister_cb = NULL; | |
875 | dev->ctx_size = ctx_size; | |
876 | dev->for_each_count = 0; | |
877 | dev->unregistered = false; | |
878 | dev->refcnt = 0; | |
879 | ||
880 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Registering io_device %s (%p) on thread %s\n", | |
9f95a23c | 881 | dev->name, dev->io_device, thread->name); |
11fdf7f2 TL |
882 | |
883 | pthread_mutex_lock(&g_devlist_mutex); | |
884 | TAILQ_FOREACH(tmp, &g_io_devices, tailq) { | |
885 | if (tmp->io_device == io_device) { | |
9f95a23c TL |
886 | SPDK_ERRLOG("io_device %p already registered (old:%s new:%s)\n", |
887 | io_device, tmp->name, dev->name); | |
11fdf7f2 TL |
888 | free(dev->name); |
889 | free(dev); | |
890 | pthread_mutex_unlock(&g_devlist_mutex); | |
891 | return; | |
892 | } | |
893 | } | |
894 | TAILQ_INSERT_TAIL(&g_io_devices, dev, tailq); | |
895 | pthread_mutex_unlock(&g_devlist_mutex); | |
896 | } | |
897 | ||
898 | static void | |
899 | _finish_unregister(void *arg) | |
900 | { | |
901 | struct io_device *dev = arg; | |
902 | ||
903 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Finishing unregistration of io_device %s (%p) on thread %s\n", | |
904 | dev->name, dev->io_device, dev->unregister_thread->name); | |
905 | ||
906 | dev->unregister_cb(dev->io_device); | |
907 | free(dev->name); | |
908 | free(dev); | |
909 | } | |
910 | ||
911 | static void | |
912 | _spdk_io_device_free(struct io_device *dev) | |
913 | { | |
914 | if (dev->unregister_cb == NULL) { | |
915 | free(dev->name); | |
916 | free(dev); | |
917 | } else { | |
918 | assert(dev->unregister_thread != NULL); | |
919 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "io_device %s (%p) needs to unregister from thread %s\n", | |
920 | dev->name, dev->io_device, dev->unregister_thread->name); | |
921 | spdk_thread_send_msg(dev->unregister_thread, _finish_unregister, dev); | |
922 | } | |
923 | } | |
924 | ||
925 | void | |
926 | spdk_io_device_unregister(void *io_device, spdk_io_device_unregister_cb unregister_cb) | |
927 | { | |
928 | struct io_device *dev; | |
929 | uint32_t refcnt; | |
930 | struct spdk_thread *thread; | |
931 | ||
932 | thread = spdk_get_thread(); | |
9f95a23c TL |
933 | if (!thread) { |
934 | SPDK_ERRLOG("%s called from non-SPDK thread\n", __func__); | |
935 | assert(false); | |
936 | return; | |
937 | } | |
11fdf7f2 TL |
938 | |
939 | pthread_mutex_lock(&g_devlist_mutex); | |
940 | TAILQ_FOREACH(dev, &g_io_devices, tailq) { | |
941 | if (dev->io_device == io_device) { | |
942 | break; | |
943 | } | |
944 | } | |
945 | ||
946 | if (!dev) { | |
947 | SPDK_ERRLOG("io_device %p not found\n", io_device); | |
948 | assert(false); | |
949 | pthread_mutex_unlock(&g_devlist_mutex); | |
950 | return; | |
951 | } | |
952 | ||
953 | if (dev->for_each_count > 0) { | |
9f95a23c TL |
954 | SPDK_ERRLOG("io_device %s (%p) has %u for_each calls outstanding\n", |
955 | dev->name, io_device, dev->for_each_count); | |
11fdf7f2 TL |
956 | pthread_mutex_unlock(&g_devlist_mutex); |
957 | return; | |
958 | } | |
959 | ||
960 | dev->unregister_cb = unregister_cb; | |
961 | dev->unregistered = true; | |
962 | TAILQ_REMOVE(&g_io_devices, dev, tailq); | |
963 | refcnt = dev->refcnt; | |
964 | dev->unregister_thread = thread; | |
965 | pthread_mutex_unlock(&g_devlist_mutex); | |
966 | ||
967 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Unregistering io_device %s (%p) from thread %s\n", | |
968 | dev->name, dev->io_device, thread->name); | |
969 | ||
970 | if (refcnt > 0) { | |
971 | /* defer deletion */ | |
972 | return; | |
973 | } | |
974 | ||
975 | _spdk_io_device_free(dev); | |
976 | } | |
977 | ||
978 | struct spdk_io_channel * | |
979 | spdk_get_io_channel(void *io_device) | |
980 | { | |
981 | struct spdk_io_channel *ch; | |
982 | struct spdk_thread *thread; | |
983 | struct io_device *dev; | |
984 | int rc; | |
985 | ||
986 | pthread_mutex_lock(&g_devlist_mutex); | |
987 | TAILQ_FOREACH(dev, &g_io_devices, tailq) { | |
988 | if (dev->io_device == io_device) { | |
989 | break; | |
990 | } | |
991 | } | |
992 | if (dev == NULL) { | |
993 | SPDK_ERRLOG("could not find io_device %p\n", io_device); | |
994 | pthread_mutex_unlock(&g_devlist_mutex); | |
995 | return NULL; | |
996 | } | |
997 | ||
998 | thread = _get_thread(); | |
999 | if (!thread) { | |
1000 | SPDK_ERRLOG("No thread allocated\n"); | |
1001 | pthread_mutex_unlock(&g_devlist_mutex); | |
1002 | return NULL; | |
1003 | } | |
1004 | ||
1005 | TAILQ_FOREACH(ch, &thread->io_channels, tailq) { | |
1006 | if (ch->dev == dev) { | |
1007 | ch->ref++; | |
1008 | ||
1009 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Get io_channel %p for io_device %s (%p) on thread %s refcnt %u\n", | |
1010 | ch, dev->name, dev->io_device, thread->name, ch->ref); | |
1011 | ||
1012 | /* | |
1013 | * An I/O channel already exists for this device on this | |
1014 | * thread, so return it. | |
1015 | */ | |
1016 | pthread_mutex_unlock(&g_devlist_mutex); | |
1017 | return ch; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | ch = calloc(1, sizeof(*ch) + dev->ctx_size); | |
1022 | if (ch == NULL) { | |
1023 | SPDK_ERRLOG("could not calloc spdk_io_channel\n"); | |
1024 | pthread_mutex_unlock(&g_devlist_mutex); | |
1025 | return NULL; | |
1026 | } | |
1027 | ||
1028 | ch->dev = dev; | |
1029 | ch->destroy_cb = dev->destroy_cb; | |
1030 | ch->thread = thread; | |
1031 | ch->ref = 1; | |
1032 | ch->destroy_ref = 0; | |
1033 | TAILQ_INSERT_TAIL(&thread->io_channels, ch, tailq); | |
1034 | ||
1035 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, "Get io_channel %p for io_device %s (%p) on thread %s refcnt %u\n", | |
1036 | ch, dev->name, dev->io_device, thread->name, ch->ref); | |
1037 | ||
1038 | dev->refcnt++; | |
1039 | ||
1040 | pthread_mutex_unlock(&g_devlist_mutex); | |
1041 | ||
1042 | rc = dev->create_cb(io_device, (uint8_t *)ch + sizeof(*ch)); | |
9f95a23c | 1043 | if (rc != 0) { |
11fdf7f2 TL |
1044 | pthread_mutex_lock(&g_devlist_mutex); |
1045 | TAILQ_REMOVE(&ch->thread->io_channels, ch, tailq); | |
1046 | dev->refcnt--; | |
1047 | free(ch); | |
1048 | pthread_mutex_unlock(&g_devlist_mutex); | |
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | return ch; | |
1053 | } | |
1054 | ||
1055 | static void | |
1056 | _spdk_put_io_channel(void *arg) | |
1057 | { | |
1058 | struct spdk_io_channel *ch = arg; | |
1059 | bool do_remove_dev = true; | |
9f95a23c TL |
1060 | struct spdk_thread *thread; |
1061 | ||
1062 | thread = spdk_get_thread(); | |
1063 | if (!thread) { | |
1064 | SPDK_ERRLOG("%s called from non-SPDK thread\n", __func__); | |
1065 | assert(false); | |
1066 | return; | |
1067 | } | |
11fdf7f2 TL |
1068 | |
1069 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, | |
1070 | "Releasing io_channel %p for io_device %s (%p). Channel thread %p. Current thread %s\n", | |
9f95a23c | 1071 | ch, ch->dev->name, ch->dev->io_device, ch->thread, thread->name); |
11fdf7f2 | 1072 | |
9f95a23c | 1073 | assert(ch->thread == thread); |
11fdf7f2 TL |
1074 | |
1075 | ch->destroy_ref--; | |
1076 | ||
1077 | if (ch->ref > 0 || ch->destroy_ref > 0) { | |
1078 | /* | |
1079 | * Another reference to the associated io_device was requested | |
1080 | * after this message was sent but before it had a chance to | |
1081 | * execute. | |
1082 | */ | |
1083 | return; | |
1084 | } | |
1085 | ||
1086 | pthread_mutex_lock(&g_devlist_mutex); | |
1087 | TAILQ_REMOVE(&ch->thread->io_channels, ch, tailq); | |
1088 | pthread_mutex_unlock(&g_devlist_mutex); | |
1089 | ||
1090 | /* Don't hold the devlist mutex while the destroy_cb is called. */ | |
1091 | ch->destroy_cb(ch->dev->io_device, spdk_io_channel_get_ctx(ch)); | |
1092 | ||
1093 | pthread_mutex_lock(&g_devlist_mutex); | |
1094 | ch->dev->refcnt--; | |
1095 | ||
1096 | if (!ch->dev->unregistered) { | |
1097 | do_remove_dev = false; | |
1098 | } | |
1099 | ||
1100 | if (ch->dev->refcnt > 0) { | |
1101 | do_remove_dev = false; | |
1102 | } | |
1103 | ||
1104 | pthread_mutex_unlock(&g_devlist_mutex); | |
1105 | ||
1106 | if (do_remove_dev) { | |
1107 | _spdk_io_device_free(ch->dev); | |
1108 | } | |
1109 | free(ch); | |
1110 | } | |
1111 | ||
1112 | void | |
1113 | spdk_put_io_channel(struct spdk_io_channel *ch) | |
1114 | { | |
1115 | SPDK_DEBUGLOG(SPDK_LOG_THREAD, | |
1116 | "Putting io_channel %p for io_device %s (%p) on thread %s refcnt %u\n", | |
1117 | ch, ch->dev->name, ch->dev->io_device, ch->thread->name, ch->ref); | |
1118 | ||
1119 | ch->ref--; | |
1120 | ||
1121 | if (ch->ref == 0) { | |
1122 | ch->destroy_ref++; | |
1123 | spdk_thread_send_msg(ch->thread, _spdk_put_io_channel, ch); | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | struct spdk_io_channel * | |
1128 | spdk_io_channel_from_ctx(void *ctx) | |
1129 | { | |
1130 | return (struct spdk_io_channel *)((uint8_t *)ctx - sizeof(struct spdk_io_channel)); | |
1131 | } | |
1132 | ||
1133 | struct spdk_thread * | |
1134 | spdk_io_channel_get_thread(struct spdk_io_channel *ch) | |
1135 | { | |
1136 | return ch->thread; | |
1137 | } | |
1138 | ||
1139 | struct spdk_io_channel_iter { | |
1140 | void *io_device; | |
1141 | struct io_device *dev; | |
1142 | spdk_channel_msg fn; | |
1143 | int status; | |
1144 | void *ctx; | |
1145 | struct spdk_io_channel *ch; | |
1146 | ||
1147 | struct spdk_thread *cur_thread; | |
1148 | ||
1149 | struct spdk_thread *orig_thread; | |
1150 | spdk_channel_for_each_cpl cpl; | |
1151 | }; | |
1152 | ||
1153 | void * | |
1154 | spdk_io_channel_iter_get_io_device(struct spdk_io_channel_iter *i) | |
1155 | { | |
1156 | return i->io_device; | |
1157 | } | |
1158 | ||
1159 | struct spdk_io_channel * | |
1160 | spdk_io_channel_iter_get_channel(struct spdk_io_channel_iter *i) | |
1161 | { | |
1162 | return i->ch; | |
1163 | } | |
1164 | ||
1165 | void * | |
1166 | spdk_io_channel_iter_get_ctx(struct spdk_io_channel_iter *i) | |
1167 | { | |
1168 | return i->ctx; | |
1169 | } | |
1170 | ||
1171 | static void | |
1172 | _call_completion(void *ctx) | |
1173 | { | |
1174 | struct spdk_io_channel_iter *i = ctx; | |
1175 | ||
1176 | if (i->cpl != NULL) { | |
1177 | i->cpl(i, i->status); | |
1178 | } | |
1179 | free(i); | |
1180 | } | |
1181 | ||
1182 | static void | |
1183 | _call_channel(void *ctx) | |
1184 | { | |
1185 | struct spdk_io_channel_iter *i = ctx; | |
1186 | struct spdk_io_channel *ch; | |
1187 | ||
1188 | /* | |
1189 | * It is possible that the channel was deleted before this | |
1190 | * message had a chance to execute. If so, skip calling | |
1191 | * the fn() on this thread. | |
1192 | */ | |
1193 | pthread_mutex_lock(&g_devlist_mutex); | |
1194 | TAILQ_FOREACH(ch, &i->cur_thread->io_channels, tailq) { | |
1195 | if (ch->dev->io_device == i->io_device) { | |
1196 | break; | |
1197 | } | |
1198 | } | |
1199 | pthread_mutex_unlock(&g_devlist_mutex); | |
1200 | ||
1201 | if (ch) { | |
1202 | i->fn(i); | |
1203 | } else { | |
1204 | spdk_for_each_channel_continue(i, 0); | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | void | |
1209 | spdk_for_each_channel(void *io_device, spdk_channel_msg fn, void *ctx, | |
1210 | spdk_channel_for_each_cpl cpl) | |
1211 | { | |
1212 | struct spdk_thread *thread; | |
1213 | struct spdk_io_channel *ch; | |
1214 | struct spdk_io_channel_iter *i; | |
1215 | ||
1216 | i = calloc(1, sizeof(*i)); | |
1217 | if (!i) { | |
1218 | SPDK_ERRLOG("Unable to allocate iterator\n"); | |
1219 | return; | |
1220 | } | |
1221 | ||
1222 | i->io_device = io_device; | |
1223 | i->fn = fn; | |
1224 | i->ctx = ctx; | |
1225 | i->cpl = cpl; | |
1226 | ||
1227 | pthread_mutex_lock(&g_devlist_mutex); | |
1228 | i->orig_thread = _get_thread(); | |
1229 | ||
1230 | TAILQ_FOREACH(thread, &g_threads, tailq) { | |
1231 | TAILQ_FOREACH(ch, &thread->io_channels, tailq) { | |
1232 | if (ch->dev->io_device == io_device) { | |
1233 | ch->dev->for_each_count++; | |
1234 | i->dev = ch->dev; | |
1235 | i->cur_thread = thread; | |
1236 | i->ch = ch; | |
1237 | pthread_mutex_unlock(&g_devlist_mutex); | |
1238 | spdk_thread_send_msg(thread, _call_channel, i); | |
1239 | return; | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | pthread_mutex_unlock(&g_devlist_mutex); | |
1245 | ||
1246 | spdk_thread_send_msg(i->orig_thread, _call_completion, i); | |
1247 | } | |
1248 | ||
1249 | void | |
1250 | spdk_for_each_channel_continue(struct spdk_io_channel_iter *i, int status) | |
1251 | { | |
1252 | struct spdk_thread *thread; | |
1253 | struct spdk_io_channel *ch; | |
1254 | ||
1255 | assert(i->cur_thread == spdk_get_thread()); | |
1256 | ||
1257 | i->status = status; | |
1258 | ||
1259 | pthread_mutex_lock(&g_devlist_mutex); | |
1260 | if (status) { | |
1261 | goto end; | |
1262 | } | |
1263 | thread = TAILQ_NEXT(i->cur_thread, tailq); | |
1264 | while (thread) { | |
1265 | TAILQ_FOREACH(ch, &thread->io_channels, tailq) { | |
1266 | if (ch->dev->io_device == i->io_device) { | |
1267 | i->cur_thread = thread; | |
1268 | i->ch = ch; | |
1269 | pthread_mutex_unlock(&g_devlist_mutex); | |
1270 | spdk_thread_send_msg(thread, _call_channel, i); | |
1271 | return; | |
1272 | } | |
1273 | } | |
1274 | thread = TAILQ_NEXT(thread, tailq); | |
1275 | } | |
1276 | ||
1277 | end: | |
1278 | i->dev->for_each_count--; | |
1279 | i->ch = NULL; | |
1280 | pthread_mutex_unlock(&g_devlist_mutex); | |
1281 | ||
1282 | spdk_thread_send_msg(i->orig_thread, _call_completion, i); | |
1283 | } | |
1284 | ||
1285 | ||
1286 | SPDK_LOG_REGISTER_COMPONENT("thread", SPDK_LOG_THREAD) |