Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2016 Intel Corporation.
3 : * All rights reserved.
4 : * Copyright (c) 2022, 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
5 : */
6 :
7 : #include "spdk/stdinc.h"
8 :
9 : #include "spdk/env.h"
10 : #include "spdk/likely.h"
11 : #include "spdk/queue.h"
12 : #include "spdk/string.h"
13 : #include "spdk/thread.h"
14 : #include "spdk/trace.h"
15 : #include "spdk/util.h"
16 : #include "spdk/fd_group.h"
17 :
18 : #include "spdk/log.h"
19 : #include "spdk_internal/thread.h"
20 : #include "spdk_internal/usdt.h"
21 : #include "thread_internal.h"
22 :
23 : #include "spdk_internal/trace_defs.h"
24 :
25 : #ifdef __linux__
26 : #include <sys/timerfd.h>
27 : #include <sys/eventfd.h>
28 : #endif
29 :
30 : #ifdef SPDK_HAVE_EXECINFO_H
31 : #include <execinfo.h>
32 : #endif
33 :
34 : #define SPDK_MSG_BATCH_SIZE 8
35 : #define SPDK_MAX_DEVICE_NAME_LEN 256
36 : #define SPDK_THREAD_EXIT_TIMEOUT_SEC 5
37 : #define SPDK_MAX_POLLER_NAME_LEN 256
38 : #define SPDK_MAX_THREAD_NAME_LEN 256
39 :
40 : static struct spdk_thread *g_app_thread;
41 :
42 : struct spdk_interrupt {
43 : int efd;
44 : struct spdk_thread *thread;
45 : spdk_interrupt_fn fn;
46 : void *arg;
47 : char name[SPDK_MAX_POLLER_NAME_LEN + 1];
48 : };
49 :
50 : enum spdk_poller_state {
51 : /* The poller is registered with a thread but not currently executing its fn. */
52 : SPDK_POLLER_STATE_WAITING,
53 :
54 : /* The poller is currently running its fn. */
55 : SPDK_POLLER_STATE_RUNNING,
56 :
57 : /* The poller was unregistered during the execution of its fn. */
58 : SPDK_POLLER_STATE_UNREGISTERED,
59 :
60 : /* The poller is in the process of being paused. It will be paused
61 : * during the next time it's supposed to be executed.
62 : */
63 : SPDK_POLLER_STATE_PAUSING,
64 :
65 : /* The poller is registered but currently paused. It's on the
66 : * paused_pollers list.
67 : */
68 : SPDK_POLLER_STATE_PAUSED,
69 : };
70 :
71 : struct spdk_poller {
72 : TAILQ_ENTRY(spdk_poller) tailq;
73 : RB_ENTRY(spdk_poller) node;
74 :
75 : /* Current state of the poller; should only be accessed from the poller's thread. */
76 : enum spdk_poller_state state;
77 :
78 : uint64_t period_ticks;
79 : uint64_t next_run_tick;
80 : uint64_t run_count;
81 : uint64_t busy_count;
82 : uint64_t id;
83 : spdk_poller_fn fn;
84 : void *arg;
85 : struct spdk_thread *thread;
86 : struct spdk_interrupt *intr;
87 : spdk_poller_set_interrupt_mode_cb set_intr_cb_fn;
88 : void *set_intr_cb_arg;
89 :
90 : char name[SPDK_MAX_POLLER_NAME_LEN + 1];
91 : };
92 :
93 : enum spdk_thread_state {
94 : /* The thread is processing poller and message by spdk_thread_poll(). */
95 : SPDK_THREAD_STATE_RUNNING,
96 :
97 : /* The thread is in the process of termination. It reaps unregistering
98 : * poller are releasing I/O channel.
99 : */
100 : SPDK_THREAD_STATE_EXITING,
101 :
102 : /* The thread is exited. It is ready to call spdk_thread_destroy(). */
103 : SPDK_THREAD_STATE_EXITED,
104 : };
105 :
106 : struct spdk_thread_post_poller_handler {
107 : spdk_post_poller_fn fn;
108 : void *fn_arg;
109 : };
110 :
111 : #define SPDK_THREAD_MAX_POST_POLLER_HANDLERS (4)
112 :
113 : struct spdk_thread {
114 : uint64_t tsc_last;
115 : struct spdk_thread_stats stats;
116 : /*
117 : * Contains pollers actively running on this thread. Pollers
118 : * are run round-robin. The thread takes one poller from the head
119 : * of the ring, executes it, then puts it back at the tail of
120 : * the ring.
121 : */
122 : TAILQ_HEAD(active_pollers_head, spdk_poller) active_pollers;
123 : /**
124 : * Contains pollers running on this thread with a periodic timer.
125 : */
126 : RB_HEAD(timed_pollers_tree, spdk_poller) timed_pollers;
127 : struct spdk_poller *first_timed_poller;
128 : /*
129 : * Contains paused pollers. Pollers on this queue are waiting until
130 : * they are resumed (in which case they're put onto the active/timer
131 : * queues) or unregistered.
132 : */
133 : TAILQ_HEAD(paused_pollers_head, spdk_poller) paused_pollers;
134 : struct spdk_thread_post_poller_handler pp_handlers[SPDK_THREAD_MAX_POST_POLLER_HANDLERS];
135 : struct spdk_ring *messages;
136 : uint8_t num_pp_handlers;
137 : int msg_fd;
138 : SLIST_HEAD(, spdk_msg) msg_cache;
139 : size_t msg_cache_count;
140 : spdk_msg_fn critical_msg;
141 : uint64_t id;
142 : uint64_t next_poller_id;
143 : enum spdk_thread_state state;
144 : int pending_unregister_count;
145 : uint32_t for_each_count;
146 :
147 : RB_HEAD(io_channel_tree, spdk_io_channel) io_channels;
148 : TAILQ_ENTRY(spdk_thread) tailq;
149 :
150 : char name[SPDK_MAX_THREAD_NAME_LEN + 1];
151 : struct spdk_cpuset cpumask;
152 : uint64_t exit_timeout_tsc;
153 :
154 : int32_t lock_count;
155 :
156 : /* spdk_thread is bound to current CPU core. */
157 : bool is_bound;
158 :
159 : /* Indicates whether this spdk_thread currently runs in interrupt. */
160 : bool in_interrupt;
161 : bool poller_unregistered;
162 : struct spdk_fd_group *fgrp;
163 :
164 : uint16_t trace_id;
165 :
166 : uint8_t reserved[6];
167 :
168 : /* User context allocated at the end */
169 : uint8_t ctx[0];
170 : };
171 :
172 : /*
173 : * Assert that spdk_thread struct is 8 byte aligned to ensure
174 : * the user ctx is also 8-byte aligned.
175 : */
176 : SPDK_STATIC_ASSERT((sizeof(struct spdk_thread)) % 8 == 0, "Incorrect size");
177 :
178 : static pthread_mutex_t g_devlist_mutex = PTHREAD_MUTEX_INITIALIZER;
179 :
180 : static spdk_new_thread_fn g_new_thread_fn = NULL;
181 : static spdk_thread_op_fn g_thread_op_fn = NULL;
182 : static spdk_thread_op_supported_fn g_thread_op_supported_fn;
183 : static size_t g_ctx_sz = 0;
184 : /* Monotonic increasing ID is set to each created thread beginning at 1. Once the
185 : * ID exceeds UINT64_MAX, further thread creation is not allowed and restarting
186 : * SPDK application is required.
187 : */
188 : static uint64_t g_thread_id = 1;
189 :
190 : enum spin_error {
191 : SPIN_ERR_NONE,
192 : /* Trying to use an SPDK lock while not on an SPDK thread */
193 : SPIN_ERR_NOT_SPDK_THREAD,
194 : /* Trying to lock a lock already held by this SPDK thread */
195 : SPIN_ERR_DEADLOCK,
196 : /* Trying to unlock a lock not held by this SPDK thread */
197 : SPIN_ERR_WRONG_THREAD,
198 : /* pthread_spin_*() returned an error */
199 : SPIN_ERR_PTHREAD,
200 : /* Trying to destroy a lock that is held */
201 : SPIN_ERR_LOCK_HELD,
202 : /* lock_count is invalid */
203 : SPIN_ERR_LOCK_COUNT,
204 : /*
205 : * An spdk_thread may migrate to another pthread. A spinlock held across migration leads to
206 : * undefined behavior. A spinlock held when an SPDK thread goes off CPU would lead to
207 : * deadlock when another SPDK thread on the same pthread tries to take that lock.
208 : */
209 : SPIN_ERR_HOLD_DURING_SWITCH,
210 : /* Trying to use a lock that was destroyed (but not re-initialized) */
211 : SPIN_ERR_DESTROYED,
212 : /* Trying to use a lock that is not initialized */
213 : SPIN_ERR_NOT_INITIALIZED,
214 :
215 : /* Must be last, not an actual error code */
216 : SPIN_ERR_LAST
217 : };
218 :
219 : static const char *spin_error_strings[] = {
220 : [SPIN_ERR_NONE] = "No error",
221 : [SPIN_ERR_NOT_SPDK_THREAD] = "Not an SPDK thread",
222 : [SPIN_ERR_DEADLOCK] = "Deadlock detected",
223 : [SPIN_ERR_WRONG_THREAD] = "Unlock on wrong SPDK thread",
224 : [SPIN_ERR_PTHREAD] = "Error from pthread_spinlock",
225 : [SPIN_ERR_LOCK_HELD] = "Destroying a held spinlock",
226 : [SPIN_ERR_LOCK_COUNT] = "Lock count is invalid",
227 : [SPIN_ERR_HOLD_DURING_SWITCH] = "Lock(s) held while SPDK thread going off CPU",
228 : [SPIN_ERR_DESTROYED] = "Lock has been destroyed",
229 : [SPIN_ERR_NOT_INITIALIZED] = "Lock has not been initialized",
230 : };
231 :
232 : #define SPIN_ERROR_STRING(err) (err < 0 || err >= SPDK_COUNTOF(spin_error_strings)) \
233 : ? "Unknown error" : spin_error_strings[err]
234 :
235 : static void
236 0 : __posix_abort(enum spin_error err)
237 : {
238 0 : abort();
239 : }
240 :
241 : typedef void (*spin_abort)(enum spin_error err);
242 : spin_abort g_spin_abort_fn = __posix_abort;
243 :
244 : #define SPIN_ASSERT_IMPL(cond, err, extra_log, ret) \
245 : do { \
246 : if (spdk_unlikely(!(cond))) { \
247 : SPDK_ERRLOG("unrecoverable spinlock error %d: %s (%s)\n", err, \
248 : SPIN_ERROR_STRING(err), #cond); \
249 : extra_log; \
250 : g_spin_abort_fn(err); \
251 : ret; \
252 : } \
253 : } while (0)
254 : #define SPIN_ASSERT_LOG_STACKS(cond, err, lock) \
255 : SPIN_ASSERT_IMPL(cond, err, sspin_stacks_print(sspin), return)
256 : #define SPIN_ASSERT_RETURN(cond, err, ret) SPIN_ASSERT_IMPL(cond, err, , return ret)
257 : #define SPIN_ASSERT(cond, err) SPIN_ASSERT_IMPL(cond, err, ,)
258 :
259 : struct io_device {
260 : void *io_device;
261 : char name[SPDK_MAX_DEVICE_NAME_LEN + 1];
262 : spdk_io_channel_create_cb create_cb;
263 : spdk_io_channel_destroy_cb destroy_cb;
264 : spdk_io_device_unregister_cb unregister_cb;
265 : struct spdk_thread *unregister_thread;
266 : uint32_t ctx_size;
267 : uint32_t for_each_count;
268 : RB_ENTRY(io_device) node;
269 :
270 : uint32_t refcnt;
271 :
272 : bool pending_unregister;
273 : bool unregistered;
274 : };
275 :
276 : static RB_HEAD(io_device_tree, io_device) g_io_devices = RB_INITIALIZER(g_io_devices);
277 :
278 : static int
279 10530 : io_device_cmp(struct io_device *dev1, struct io_device *dev2)
280 : {
281 10530 : return (dev1->io_device < dev2->io_device ? -1 : dev1->io_device > dev2->io_device);
282 : }
283 :
284 18915 : RB_GENERATE_STATIC(io_device_tree, io_device, node, io_device_cmp);
285 :
286 : static int
287 8428 : io_channel_cmp(struct spdk_io_channel *ch1, struct spdk_io_channel *ch2)
288 : {
289 8428 : return (ch1->dev < ch2->dev ? -1 : ch1->dev > ch2->dev);
290 : }
291 :
292 20490 : RB_GENERATE_STATIC(io_channel_tree, spdk_io_channel, node, io_channel_cmp);
293 :
294 : struct spdk_msg {
295 : spdk_msg_fn fn;
296 : void *arg;
297 :
298 : SLIST_ENTRY(spdk_msg) link;
299 : };
300 :
301 : static struct spdk_mempool *g_spdk_msg_mempool = NULL;
302 :
303 : static TAILQ_HEAD(, spdk_thread) g_threads = TAILQ_HEAD_INITIALIZER(g_threads);
304 : static uint32_t g_thread_count = 0;
305 :
306 : static __thread struct spdk_thread *tls_thread = NULL;
307 :
308 : static void
309 0 : thread_trace(void)
310 : {
311 0 : struct spdk_trace_tpoint_opts opts[] = {
312 : {
313 : "THREAD_IOCH_GET", TRACE_THREAD_IOCH_GET,
314 : OWNER_TYPE_NONE, OBJECT_NONE, 0,
315 : {{ "refcnt", SPDK_TRACE_ARG_TYPE_INT, 4 }}
316 : },
317 : {
318 : "THREAD_IOCH_PUT", TRACE_THREAD_IOCH_PUT,
319 : OWNER_TYPE_NONE, OBJECT_NONE, 0,
320 : {{ "refcnt", SPDK_TRACE_ARG_TYPE_INT, 4 }}
321 : }
322 : };
323 :
324 0 : spdk_trace_register_owner_type(OWNER_TYPE_THREAD, 't');
325 0 : spdk_trace_register_description_ext(opts, SPDK_COUNTOF(opts));
326 0 : }
327 34 : SPDK_TRACE_REGISTER_FN(thread_trace, "thread", TRACE_GROUP_THREAD)
328 :
329 : /*
330 : * If this compare function returns zero when two next_run_ticks are equal,
331 : * the macro RB_INSERT() returns a pointer to the element with the same
332 : * next_run_tick.
333 : *
334 : * Fortunately, the macro RB_REMOVE() takes not a key but a pointer to the element
335 : * to remove as a parameter.
336 : *
337 : * Hence we allow RB_INSERT() to insert elements with the same keys on the right
338 : * side by returning 1 when two next_run_ticks are equal.
339 : */
340 : static inline int
341 909 : timed_poller_compare(struct spdk_poller *poller1, struct spdk_poller *poller2)
342 : {
343 909 : if (poller1->next_run_tick < poller2->next_run_tick) {
344 502 : return -1;
345 : } else {
346 407 : return 1;
347 : }
348 909 : }
349 :
350 6098 : RB_GENERATE_STATIC(timed_pollers_tree, spdk_poller, node, timed_poller_compare);
351 :
352 : static inline struct spdk_thread *
353 768664 : _get_thread(void)
354 : {
355 768664 : return tls_thread;
356 : }
357 :
358 : static int
359 86 : _thread_lib_init(size_t ctx_sz, size_t msg_mempool_sz)
360 : {
361 : char mempool_name[SPDK_MAX_MEMZONE_NAME_LEN];
362 :
363 86 : g_ctx_sz = ctx_sz;
364 :
365 86 : snprintf(mempool_name, sizeof(mempool_name), "msgpool_%d", getpid());
366 86 : g_spdk_msg_mempool = spdk_mempool_create(mempool_name, msg_mempool_sz,
367 : sizeof(struct spdk_msg),
368 : 0, /* No cache. We do our own. */
369 : SPDK_ENV_NUMA_ID_ANY);
370 :
371 86 : SPDK_DEBUGLOG(thread, "spdk_msg_mempool was created with size: %zu\n",
372 : msg_mempool_sz);
373 :
374 86 : if (!g_spdk_msg_mempool) {
375 0 : SPDK_ERRLOG("spdk_msg_mempool creation failed\n");
376 0 : return -ENOMEM;
377 : }
378 :
379 86 : return 0;
380 86 : }
381 :
382 : static void thread_interrupt_destroy(struct spdk_thread *thread);
383 : static int thread_interrupt_create(struct spdk_thread *thread);
384 :
385 : static void
386 161 : _free_thread(struct spdk_thread *thread)
387 : {
388 : struct spdk_io_channel *ch;
389 : struct spdk_msg *msg;
390 : struct spdk_poller *poller, *ptmp;
391 :
392 161 : RB_FOREACH(ch, io_channel_tree, &thread->io_channels) {
393 0 : SPDK_ERRLOG("thread %s still has channel for io_device %s\n",
394 : thread->name, ch->dev->name);
395 0 : }
396 :
397 161 : TAILQ_FOREACH_SAFE(poller, &thread->active_pollers, tailq, ptmp) {
398 0 : if (poller->state != SPDK_POLLER_STATE_UNREGISTERED) {
399 0 : SPDK_WARNLOG("active_poller %s still registered at thread exit\n",
400 : poller->name);
401 0 : }
402 0 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
403 0 : free(poller);
404 0 : }
405 :
406 188 : RB_FOREACH_SAFE(poller, timed_pollers_tree, &thread->timed_pollers, ptmp) {
407 27 : if (poller->state != SPDK_POLLER_STATE_UNREGISTERED) {
408 0 : SPDK_WARNLOG("timed_poller %s still registered at thread exit\n",
409 : poller->name);
410 0 : }
411 27 : RB_REMOVE(timed_pollers_tree, &thread->timed_pollers, poller);
412 27 : free(poller);
413 27 : }
414 :
415 161 : TAILQ_FOREACH_SAFE(poller, &thread->paused_pollers, tailq, ptmp) {
416 0 : SPDK_WARNLOG("paused_poller %s still registered at thread exit\n", poller->name);
417 0 : TAILQ_REMOVE(&thread->paused_pollers, poller, tailq);
418 0 : free(poller);
419 0 : }
420 :
421 161 : pthread_mutex_lock(&g_devlist_mutex);
422 161 : assert(g_thread_count > 0);
423 161 : g_thread_count--;
424 161 : TAILQ_REMOVE(&g_threads, thread, tailq);
425 161 : pthread_mutex_unlock(&g_devlist_mutex);
426 :
427 161 : msg = SLIST_FIRST(&thread->msg_cache);
428 164886 : while (msg != NULL) {
429 164725 : SLIST_REMOVE_HEAD(&thread->msg_cache, link);
430 :
431 164725 : assert(thread->msg_cache_count > 0);
432 164725 : thread->msg_cache_count--;
433 164725 : spdk_mempool_put(g_spdk_msg_mempool, msg);
434 :
435 164725 : msg = SLIST_FIRST(&thread->msg_cache);
436 : }
437 :
438 161 : assert(thread->msg_cache_count == 0);
439 :
440 161 : if (spdk_interrupt_mode_is_enabled()) {
441 0 : thread_interrupt_destroy(thread);
442 0 : }
443 :
444 161 : spdk_ring_free(thread->messages);
445 161 : free(thread);
446 161 : }
447 :
448 : int
449 75 : spdk_thread_lib_init(spdk_new_thread_fn new_thread_fn, size_t ctx_sz)
450 : {
451 75 : assert(g_new_thread_fn == NULL);
452 75 : assert(g_thread_op_fn == NULL);
453 :
454 75 : if (new_thread_fn == NULL) {
455 73 : SPDK_INFOLOG(thread, "new_thread_fn was not specified at spdk_thread_lib_init\n");
456 73 : } else {
457 2 : g_new_thread_fn = new_thread_fn;
458 : }
459 :
460 75 : return _thread_lib_init(ctx_sz, SPDK_DEFAULT_MSG_MEMPOOL_SIZE);
461 : }
462 :
463 : int
464 11 : spdk_thread_lib_init_ext(spdk_thread_op_fn thread_op_fn,
465 : spdk_thread_op_supported_fn thread_op_supported_fn,
466 : size_t ctx_sz, size_t msg_mempool_sz)
467 : {
468 11 : assert(g_new_thread_fn == NULL);
469 11 : assert(g_thread_op_fn == NULL);
470 11 : assert(g_thread_op_supported_fn == NULL);
471 :
472 11 : if ((thread_op_fn != NULL) != (thread_op_supported_fn != NULL)) {
473 0 : SPDK_ERRLOG("Both must be defined or undefined together.\n");
474 0 : return -EINVAL;
475 : }
476 :
477 11 : if (thread_op_fn == NULL && thread_op_supported_fn == NULL) {
478 0 : SPDK_INFOLOG(thread, "thread_op_fn and thread_op_supported_fn were not specified\n");
479 0 : } else {
480 11 : g_thread_op_fn = thread_op_fn;
481 11 : g_thread_op_supported_fn = thread_op_supported_fn;
482 : }
483 :
484 11 : return _thread_lib_init(ctx_sz, msg_mempool_sz);
485 11 : }
486 :
487 : void
488 84 : spdk_thread_lib_fini(void)
489 : {
490 : struct io_device *dev;
491 :
492 85 : RB_FOREACH(dev, io_device_tree, &g_io_devices) {
493 1 : SPDK_ERRLOG("io_device %s not unregistered\n", dev->name);
494 1 : }
495 :
496 84 : g_new_thread_fn = NULL;
497 84 : g_thread_op_fn = NULL;
498 84 : g_thread_op_supported_fn = NULL;
499 84 : g_ctx_sz = 0;
500 84 : if (g_app_thread != NULL) {
501 80 : _free_thread(g_app_thread);
502 80 : g_app_thread = NULL;
503 80 : }
504 :
505 84 : if (g_spdk_msg_mempool) {
506 84 : spdk_mempool_free(g_spdk_msg_mempool);
507 84 : g_spdk_msg_mempool = NULL;
508 84 : }
509 84 : }
510 :
511 : struct spdk_thread *
512 188 : spdk_thread_create(const char *name, const struct spdk_cpuset *cpumask)
513 : {
514 : struct spdk_thread *thread, *null_thread;
515 188 : size_t size = SPDK_ALIGN_CEIL(sizeof(*thread) + g_ctx_sz, SPDK_CACHE_LINE_SIZE);
516 : struct spdk_msg *msgs[SPDK_MSG_MEMPOOL_CACHE_SIZE];
517 188 : int rc = 0, i;
518 :
519 : /* Since this spdk_thread object will be used by another core, ensure that it won't share a
520 : * cache line with any other object allocated on this core */
521 188 : rc = posix_memalign((void **)&thread, SPDK_CACHE_LINE_SIZE, size);
522 188 : if (rc != 0) {
523 0 : SPDK_ERRLOG("Unable to allocate memory for thread\n");
524 0 : return NULL;
525 : }
526 188 : memset(thread, 0, size);
527 :
528 188 : if (cpumask) {
529 12 : spdk_cpuset_copy(&thread->cpumask, cpumask);
530 12 : } else {
531 176 : spdk_cpuset_negate(&thread->cpumask);
532 : }
533 :
534 188 : RB_INIT(&thread->io_channels);
535 188 : TAILQ_INIT(&thread->active_pollers);
536 188 : RB_INIT(&thread->timed_pollers);
537 188 : TAILQ_INIT(&thread->paused_pollers);
538 188 : SLIST_INIT(&thread->msg_cache);
539 188 : thread->msg_cache_count = 0;
540 :
541 188 : thread->tsc_last = spdk_get_ticks();
542 :
543 : /* Monotonic increasing ID is set to each created poller beginning at 1. Once the
544 : * ID exceeds UINT64_MAX a warning message is logged
545 : */
546 188 : thread->next_poller_id = 1;
547 :
548 188 : thread->messages = spdk_ring_create(SPDK_RING_TYPE_MP_SC, 65536, SPDK_ENV_NUMA_ID_ANY);
549 188 : if (!thread->messages) {
550 0 : SPDK_ERRLOG("Unable to allocate memory for message ring\n");
551 0 : free(thread);
552 0 : return NULL;
553 : }
554 :
555 : /* Fill the local message pool cache. */
556 188 : rc = spdk_mempool_get_bulk(g_spdk_msg_mempool, (void **)msgs, SPDK_MSG_MEMPOOL_CACHE_SIZE);
557 188 : if (rc == 0) {
558 : /* If we can't populate the cache it's ok. The cache will get filled
559 : * up organically as messages are passed to the thread. */
560 192700 : for (i = 0; i < SPDK_MSG_MEMPOOL_CACHE_SIZE; i++) {
561 192512 : SLIST_INSERT_HEAD(&thread->msg_cache, msgs[i], link);
562 192512 : thread->msg_cache_count++;
563 192512 : }
564 188 : }
565 :
566 188 : if (name) {
567 27 : snprintf(thread->name, sizeof(thread->name), "%s", name);
568 27 : } else {
569 161 : snprintf(thread->name, sizeof(thread->name), "%p", thread);
570 : }
571 :
572 188 : thread->trace_id = spdk_trace_register_owner(OWNER_TYPE_THREAD, thread->name);
573 :
574 188 : pthread_mutex_lock(&g_devlist_mutex);
575 188 : if (g_thread_id == 0) {
576 0 : SPDK_ERRLOG("Thread ID rolled over. Further thread creation is not allowed.\n");
577 0 : pthread_mutex_unlock(&g_devlist_mutex);
578 0 : _free_thread(thread);
579 0 : return NULL;
580 : }
581 188 : thread->id = g_thread_id++;
582 188 : TAILQ_INSERT_TAIL(&g_threads, thread, tailq);
583 188 : g_thread_count++;
584 188 : pthread_mutex_unlock(&g_devlist_mutex);
585 :
586 188 : SPDK_DEBUGLOG(thread, "Allocating new thread (%" PRIu64 ", %s)\n",
587 : thread->id, thread->name);
588 :
589 188 : if (spdk_interrupt_mode_is_enabled()) {
590 0 : thread->in_interrupt = true;
591 0 : rc = thread_interrupt_create(thread);
592 0 : if (rc != 0) {
593 0 : _free_thread(thread);
594 0 : return NULL;
595 : }
596 0 : }
597 :
598 188 : if (g_new_thread_fn) {
599 5 : rc = g_new_thread_fn(thread);
600 188 : } else if (g_thread_op_supported_fn && g_thread_op_supported_fn(SPDK_THREAD_OP_NEW)) {
601 14 : rc = g_thread_op_fn(thread, SPDK_THREAD_OP_NEW);
602 14 : }
603 :
604 188 : if (rc != 0) {
605 2 : _free_thread(thread);
606 2 : return NULL;
607 : }
608 :
609 186 : thread->state = SPDK_THREAD_STATE_RUNNING;
610 :
611 : /* If this is the first thread, save it as the app thread. Use an atomic
612 : * compare + exchange to guard against crazy users who might try to
613 : * call spdk_thread_create() simultaneously on multiple threads.
614 : */
615 186 : null_thread = NULL;
616 186 : __atomic_compare_exchange_n(&g_app_thread, &null_thread, thread, false,
617 : __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
618 :
619 186 : return thread;
620 188 : }
621 :
622 : struct spdk_thread *
623 1619 : spdk_thread_get_app_thread(void)
624 : {
625 1619 : return g_app_thread;
626 : }
627 :
628 : bool
629 155 : spdk_thread_is_app_thread(struct spdk_thread *thread)
630 : {
631 155 : if (thread == NULL) {
632 151 : thread = _get_thread();
633 151 : }
634 :
635 155 : return g_app_thread == thread;
636 : }
637 :
638 : void
639 1 : spdk_thread_bind(struct spdk_thread *thread, bool bind)
640 : {
641 1 : thread->is_bound = bind;
642 1 : }
643 :
644 : bool
645 8 : spdk_thread_is_bound(struct spdk_thread *thread)
646 : {
647 8 : return thread->is_bound;
648 : }
649 :
650 : void
651 423200 : spdk_set_thread(struct spdk_thread *thread)
652 : {
653 423200 : tls_thread = thread;
654 423200 : }
655 :
656 : static void
657 198 : thread_exit(struct spdk_thread *thread, uint64_t now)
658 : {
659 : struct spdk_poller *poller;
660 : struct spdk_io_channel *ch;
661 :
662 198 : if (now >= thread->exit_timeout_tsc) {
663 1 : SPDK_ERRLOG("thread %s got timeout, and move it to the exited state forcefully\n",
664 : thread->name);
665 1 : goto exited;
666 : }
667 :
668 197 : if (spdk_ring_count(thread->messages) > 0) {
669 2 : SPDK_INFOLOG(thread, "thread %s still has messages\n", thread->name);
670 2 : return;
671 : }
672 :
673 195 : if (thread->for_each_count > 0) {
674 4 : SPDK_INFOLOG(thread, "thread %s is still executing %u for_each_channels/threads\n",
675 : thread->name, thread->for_each_count);
676 4 : return;
677 : }
678 :
679 191 : TAILQ_FOREACH(poller, &thread->active_pollers, tailq) {
680 2 : if (poller->state != SPDK_POLLER_STATE_UNREGISTERED) {
681 2 : SPDK_INFOLOG(thread,
682 : "thread %s still has active poller %s\n",
683 : thread->name, poller->name);
684 2 : return;
685 : }
686 0 : }
687 :
688 236 : RB_FOREACH(poller, timed_pollers_tree, &thread->timed_pollers) {
689 47 : if (poller->state != SPDK_POLLER_STATE_UNREGISTERED) {
690 0 : SPDK_INFOLOG(thread,
691 : "thread %s still has active timed poller %s\n",
692 : thread->name, poller->name);
693 0 : return;
694 : }
695 47 : }
696 :
697 189 : TAILQ_FOREACH(poller, &thread->paused_pollers, tailq) {
698 0 : SPDK_INFOLOG(thread,
699 : "thread %s still has paused poller %s\n",
700 : thread->name, poller->name);
701 0 : return;
702 : }
703 :
704 189 : RB_FOREACH(ch, io_channel_tree, &thread->io_channels) {
705 6 : SPDK_INFOLOG(thread,
706 : "thread %s still has channel for io_device %s\n",
707 : thread->name, ch->dev->name);
708 6 : return;
709 : }
710 :
711 183 : if (thread->pending_unregister_count > 0) {
712 2 : SPDK_INFOLOG(thread,
713 : "thread %s is still unregistering io_devices\n",
714 : thread->name);
715 2 : return;
716 : }
717 :
718 : exited:
719 182 : thread->state = SPDK_THREAD_STATE_EXITED;
720 182 : if (spdk_unlikely(thread->in_interrupt)) {
721 0 : g_thread_op_fn(thread, SPDK_THREAD_OP_RESCHED);
722 0 : }
723 198 : }
724 :
725 : static void _thread_exit(void *ctx);
726 :
727 : int
728 193 : spdk_thread_exit(struct spdk_thread *thread)
729 : {
730 193 : SPDK_DEBUGLOG(thread, "Exit thread %s\n", thread->name);
731 :
732 193 : assert(tls_thread == thread);
733 :
734 193 : if (thread->state >= SPDK_THREAD_STATE_EXITING) {
735 9 : SPDK_INFOLOG(thread,
736 : "thread %s is already exiting\n",
737 : thread->name);
738 9 : return 0;
739 : }
740 :
741 184 : thread->exit_timeout_tsc = spdk_get_ticks() + (spdk_get_ticks_hz() *
742 : SPDK_THREAD_EXIT_TIMEOUT_SEC);
743 184 : thread->state = SPDK_THREAD_STATE_EXITING;
744 :
745 184 : if (spdk_interrupt_mode_is_enabled()) {
746 0 : spdk_thread_send_msg(thread, _thread_exit, thread);
747 0 : }
748 :
749 184 : return 0;
750 193 : }
751 :
752 : bool
753 0 : spdk_thread_is_running(struct spdk_thread *thread)
754 : {
755 0 : return thread->state == SPDK_THREAD_STATE_RUNNING;
756 : }
757 :
758 : bool
759 353 : spdk_thread_is_exited(struct spdk_thread *thread)
760 : {
761 353 : return thread->state == SPDK_THREAD_STATE_EXITED;
762 : }
763 :
764 : void
765 163 : spdk_thread_destroy(struct spdk_thread *thread)
766 : {
767 163 : assert(thread != NULL);
768 163 : SPDK_DEBUGLOG(thread, "Destroy thread %s\n", thread->name);
769 :
770 163 : assert(thread->state == SPDK_THREAD_STATE_EXITED);
771 :
772 163 : if (tls_thread == thread) {
773 157 : tls_thread = NULL;
774 157 : }
775 :
776 : /* To be safe, do not free the app thread until spdk_thread_lib_fini(). */
777 163 : if (thread != g_app_thread) {
778 79 : _free_thread(thread);
779 79 : }
780 163 : }
781 :
782 : void *
783 39 : spdk_thread_get_ctx(struct spdk_thread *thread)
784 : {
785 39 : if (g_ctx_sz > 0) {
786 39 : return thread->ctx;
787 : }
788 :
789 0 : return NULL;
790 39 : }
791 :
792 : struct spdk_cpuset *
793 34 : spdk_thread_get_cpumask(struct spdk_thread *thread)
794 : {
795 34 : return &thread->cpumask;
796 : }
797 :
798 : int
799 2 : spdk_thread_set_cpumask(struct spdk_cpuset *cpumask)
800 : {
801 : struct spdk_thread *thread;
802 :
803 2 : if (!g_thread_op_supported_fn || !g_thread_op_supported_fn(SPDK_THREAD_OP_RESCHED)) {
804 0 : SPDK_ERRLOG("Framework does not support reschedule operation.\n");
805 0 : assert(false);
806 : return -ENOTSUP;
807 : }
808 :
809 2 : thread = spdk_get_thread();
810 2 : if (!thread) {
811 0 : SPDK_ERRLOG("Called from non-SPDK thread\n");
812 0 : assert(false);
813 : return -EINVAL;
814 : }
815 :
816 2 : spdk_cpuset_copy(&thread->cpumask, cpumask);
817 :
818 : /* Invoke framework's reschedule operation. If this function is called multiple times
819 : * in a single spdk_thread_poll() context, the last cpumask will be used in the
820 : * reschedule operation.
821 : */
822 2 : g_thread_op_fn(thread, SPDK_THREAD_OP_RESCHED);
823 :
824 2 : return 0;
825 : }
826 :
827 : struct spdk_thread *
828 139 : spdk_thread_get_from_ctx(void *ctx)
829 : {
830 139 : if (ctx == NULL) {
831 0 : assert(false);
832 : return NULL;
833 : }
834 :
835 139 : assert(g_ctx_sz > 0);
836 :
837 139 : return SPDK_CONTAINEROF(ctx, struct spdk_thread, ctx);
838 : }
839 :
840 : static inline uint32_t
841 382884 : msg_queue_run_batch(struct spdk_thread *thread, uint32_t max_msgs)
842 : {
843 : unsigned count, i;
844 : void *messages[SPDK_MSG_BATCH_SIZE];
845 382884 : uint64_t notify = 1;
846 : int rc;
847 :
848 : #ifdef DEBUG
849 : /*
850 : * spdk_ring_dequeue() fills messages and returns how many entries it wrote,
851 : * so we will never actually read uninitialized data from events, but just to be sure
852 : * (and to silence a static analyzer false positive), initialize the array to NULL pointers.
853 : */
854 382884 : memset(messages, 0, sizeof(messages));
855 : #endif
856 :
857 382884 : if (max_msgs > 0) {
858 365 : max_msgs = spdk_min(max_msgs, SPDK_MSG_BATCH_SIZE);
859 365 : } else {
860 382519 : max_msgs = SPDK_MSG_BATCH_SIZE;
861 : }
862 :
863 382884 : count = spdk_ring_dequeue(thread->messages, messages, max_msgs);
864 382884 : if (spdk_unlikely(thread->in_interrupt) &&
865 0 : spdk_ring_count(thread->messages) != 0) {
866 0 : rc = write(thread->msg_fd, ¬ify, sizeof(notify));
867 0 : if (rc < 0) {
868 0 : SPDK_ERRLOG("failed to notify msg_queue: %s.\n", spdk_strerror(errno));
869 0 : }
870 0 : }
871 382884 : if (count == 0) {
872 283521 : return 0;
873 : }
874 :
875 200447 : for (i = 0; i < count; i++) {
876 101084 : struct spdk_msg *msg = messages[i];
877 :
878 101084 : assert(msg != NULL);
879 :
880 : SPDK_DTRACE_PROBE2(msg_exec, msg->fn, msg->arg);
881 :
882 101084 : msg->fn(msg->arg);
883 :
884 101084 : SPIN_ASSERT(thread->lock_count == 0, SPIN_ERR_HOLD_DURING_SWITCH);
885 :
886 101084 : if (thread->msg_cache_count < SPDK_MSG_MEMPOOL_CACHE_SIZE) {
887 : /* Insert the messages at the head. We want to re-use the hot
888 : * ones. */
889 100945 : SLIST_INSERT_HEAD(&thread->msg_cache, msg, link);
890 100945 : thread->msg_cache_count++;
891 100945 : } else {
892 139 : spdk_mempool_put(g_spdk_msg_mempool, msg);
893 : }
894 101084 : }
895 :
896 99363 : return count;
897 382884 : }
898 :
899 : static void
900 546 : poller_insert_timer(struct spdk_thread *thread, struct spdk_poller *poller, uint64_t now)
901 : {
902 : struct spdk_poller *tmp __attribute__((unused));
903 :
904 546 : poller->next_run_tick = now + poller->period_ticks;
905 :
906 : /*
907 : * Insert poller in the thread's timed_pollers tree by next scheduled run time
908 : * as its key.
909 : */
910 546 : tmp = RB_INSERT(timed_pollers_tree, &thread->timed_pollers, poller);
911 546 : assert(tmp == NULL);
912 :
913 : /* Update the cache only if it is empty or the inserted poller is earlier than it.
914 : * RB_MIN() is not necessary here because all pollers, which has exactly the same
915 : * next_run_tick as the existing poller, are inserted on the right side.
916 : */
917 546 : if (thread->first_timed_poller == NULL ||
918 458 : poller->next_run_tick < thread->first_timed_poller->next_run_tick) {
919 254 : thread->first_timed_poller = poller;
920 254 : }
921 546 : }
922 :
923 : static inline void
924 0 : poller_remove_timer(struct spdk_thread *thread, struct spdk_poller *poller)
925 : {
926 : struct spdk_poller *tmp __attribute__((unused));
927 :
928 0 : tmp = RB_REMOVE(timed_pollers_tree, &thread->timed_pollers, poller);
929 0 : assert(tmp != NULL);
930 :
931 : /* This function is not used in any case that is performance critical.
932 : * Update the cache simply by RB_MIN() if it needs to be changed.
933 : */
934 0 : if (thread->first_timed_poller == poller) {
935 0 : thread->first_timed_poller = RB_MIN(timed_pollers_tree, &thread->timed_pollers);
936 0 : }
937 0 : }
938 :
939 : static void
940 889 : thread_insert_poller(struct spdk_thread *thread, struct spdk_poller *poller)
941 : {
942 889 : if (poller->period_ticks) {
943 367 : poller_insert_timer(thread, poller, spdk_get_ticks());
944 367 : } else {
945 522 : TAILQ_INSERT_TAIL(&thread->active_pollers, poller, tailq);
946 : }
947 889 : }
948 :
949 : static inline void
950 382899 : thread_update_stats(struct spdk_thread *thread, uint64_t end,
951 : uint64_t start, int rc)
952 : {
953 382899 : if (rc == 0) {
954 : /* Poller status idle */
955 282967 : thread->stats.idle_tsc += end - start;
956 382899 : } else if (rc > 0) {
957 : /* Poller status busy */
958 99932 : thread->stats.busy_tsc += end - start;
959 99932 : }
960 : /* Store end time to use it as start time of the next spdk_thread_poll(). */
961 382899 : thread->tsc_last = end;
962 382899 : }
963 :
964 : static inline int
965 4377 : thread_execute_poller(struct spdk_thread *thread, struct spdk_poller *poller)
966 : {
967 : int rc;
968 :
969 4377 : switch (poller->state) {
970 : case SPDK_POLLER_STATE_UNREGISTERED:
971 102 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
972 102 : free(poller);
973 102 : return 0;
974 : case SPDK_POLLER_STATE_PAUSING:
975 5 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
976 5 : TAILQ_INSERT_TAIL(&thread->paused_pollers, poller, tailq);
977 5 : poller->state = SPDK_POLLER_STATE_PAUSED;
978 5 : return 0;
979 : case SPDK_POLLER_STATE_WAITING:
980 4270 : break;
981 : default:
982 0 : assert(false);
983 : break;
984 : }
985 :
986 4270 : poller->state = SPDK_POLLER_STATE_RUNNING;
987 4270 : rc = poller->fn(poller->arg);
988 :
989 4270 : SPIN_ASSERT(thread->lock_count == 0, SPIN_ERR_HOLD_DURING_SWITCH);
990 :
991 4270 : poller->run_count++;
992 4270 : if (rc > 0) {
993 574 : poller->busy_count++;
994 574 : }
995 :
996 : #ifdef DEBUG
997 4270 : if (rc == -1) {
998 13 : SPDK_DEBUGLOG(thread, "Poller %s returned -1\n", poller->name);
999 13 : }
1000 : #endif
1001 :
1002 4270 : switch (poller->state) {
1003 : case SPDK_POLLER_STATE_UNREGISTERED:
1004 415 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
1005 415 : free(poller);
1006 415 : break;
1007 : case SPDK_POLLER_STATE_PAUSING:
1008 7 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
1009 7 : TAILQ_INSERT_TAIL(&thread->paused_pollers, poller, tailq);
1010 7 : poller->state = SPDK_POLLER_STATE_PAUSED;
1011 7 : break;
1012 : case SPDK_POLLER_STATE_PAUSED:
1013 : case SPDK_POLLER_STATE_WAITING:
1014 0 : break;
1015 : case SPDK_POLLER_STATE_RUNNING:
1016 3848 : poller->state = SPDK_POLLER_STATE_WAITING;
1017 3848 : break;
1018 : default:
1019 0 : assert(false);
1020 : break;
1021 : }
1022 :
1023 4270 : return rc;
1024 4377 : }
1025 :
1026 : static inline int
1027 499 : thread_execute_timed_poller(struct spdk_thread *thread, struct spdk_poller *poller,
1028 : uint64_t now)
1029 : {
1030 : int rc;
1031 :
1032 499 : switch (poller->state) {
1033 : case SPDK_POLLER_STATE_UNREGISTERED:
1034 156 : free(poller);
1035 156 : return 0;
1036 : case SPDK_POLLER_STATE_PAUSING:
1037 13 : TAILQ_INSERT_TAIL(&thread->paused_pollers, poller, tailq);
1038 13 : poller->state = SPDK_POLLER_STATE_PAUSED;
1039 13 : return 0;
1040 : case SPDK_POLLER_STATE_WAITING:
1041 330 : break;
1042 : default:
1043 0 : assert(false);
1044 : break;
1045 : }
1046 :
1047 330 : poller->state = SPDK_POLLER_STATE_RUNNING;
1048 330 : rc = poller->fn(poller->arg);
1049 :
1050 330 : SPIN_ASSERT(thread->lock_count == 0, SPIN_ERR_HOLD_DURING_SWITCH);
1051 :
1052 330 : poller->run_count++;
1053 330 : if (rc > 0) {
1054 237 : poller->busy_count++;
1055 237 : }
1056 :
1057 : #ifdef DEBUG
1058 330 : if (rc == -1) {
1059 5 : SPDK_DEBUGLOG(thread, "Timed poller %s returned -1\n", poller->name);
1060 5 : }
1061 : #endif
1062 :
1063 330 : switch (poller->state) {
1064 : case SPDK_POLLER_STATE_UNREGISTERED:
1065 147 : free(poller);
1066 147 : break;
1067 : case SPDK_POLLER_STATE_PAUSING:
1068 4 : TAILQ_INSERT_TAIL(&thread->paused_pollers, poller, tailq);
1069 4 : poller->state = SPDK_POLLER_STATE_PAUSED;
1070 4 : break;
1071 : case SPDK_POLLER_STATE_PAUSED:
1072 0 : break;
1073 : case SPDK_POLLER_STATE_RUNNING:
1074 179 : poller->state = SPDK_POLLER_STATE_WAITING;
1075 : /* fallthrough */
1076 : case SPDK_POLLER_STATE_WAITING:
1077 179 : poller_insert_timer(thread, poller, now);
1078 179 : break;
1079 : default:
1080 0 : assert(false);
1081 : break;
1082 : }
1083 :
1084 330 : return rc;
1085 499 : }
1086 :
1087 : static inline void
1088 0 : thread_run_pp_handlers(struct spdk_thread *thread)
1089 : {
1090 0 : uint8_t i, count = thread->num_pp_handlers;
1091 :
1092 : /* Set to max value to prevent new handlers registration within the callback */
1093 0 : thread->num_pp_handlers = SPDK_THREAD_MAX_POST_POLLER_HANDLERS;
1094 :
1095 0 : for (i = 0; i < count; i++) {
1096 0 : thread->pp_handlers[i].fn(thread->pp_handlers[i].fn_arg);
1097 0 : thread->pp_handlers[i].fn = NULL;
1098 0 : }
1099 :
1100 0 : thread->num_pp_handlers = 0;
1101 0 : }
1102 :
1103 : static int
1104 382903 : thread_poll(struct spdk_thread *thread, uint32_t max_msgs, uint64_t now)
1105 : {
1106 : uint32_t msg_count;
1107 : struct spdk_poller *poller, *tmp;
1108 : spdk_msg_fn critical_msg;
1109 382903 : int rc = 0;
1110 :
1111 382903 : thread->tsc_last = now;
1112 :
1113 382903 : critical_msg = thread->critical_msg;
1114 382903 : if (spdk_unlikely(critical_msg != NULL)) {
1115 0 : critical_msg(NULL);
1116 0 : thread->critical_msg = NULL;
1117 0 : rc = 1;
1118 0 : }
1119 :
1120 382903 : msg_count = msg_queue_run_batch(thread, max_msgs);
1121 382903 : if (msg_count) {
1122 99386 : rc = 1;
1123 99386 : }
1124 :
1125 387280 : TAILQ_FOREACH_REVERSE_SAFE(poller, &thread->active_pollers,
1126 : active_pollers_head, tailq, tmp) {
1127 : int poller_rc;
1128 :
1129 4377 : poller_rc = thread_execute_poller(thread, poller);
1130 4377 : if (poller_rc > rc) {
1131 348 : rc = poller_rc;
1132 348 : }
1133 4377 : if (thread->num_pp_handlers) {
1134 0 : thread_run_pp_handlers(thread);
1135 0 : }
1136 4377 : }
1137 :
1138 382903 : poller = thread->first_timed_poller;
1139 383402 : while (poller != NULL) {
1140 3409 : int timer_rc = 0;
1141 :
1142 3409 : if (now < poller->next_run_tick) {
1143 2910 : break;
1144 : }
1145 :
1146 499 : tmp = RB_NEXT(timed_pollers_tree, &thread->timed_pollers, poller);
1147 499 : RB_REMOVE(timed_pollers_tree, &thread->timed_pollers, poller);
1148 :
1149 : /* Update the cache to the next timed poller in the list
1150 : * only if the current poller is still the closest, otherwise,
1151 : * do nothing because the cache has been already updated.
1152 : */
1153 499 : if (thread->first_timed_poller == poller) {
1154 499 : thread->first_timed_poller = tmp;
1155 499 : }
1156 :
1157 499 : timer_rc = thread_execute_timed_poller(thread, poller, now);
1158 499 : if (timer_rc > rc) {
1159 198 : rc = timer_rc;
1160 198 : }
1161 :
1162 499 : poller = tmp;
1163 : }
1164 :
1165 382903 : return rc;
1166 : }
1167 :
1168 : static void
1169 0 : _thread_remove_pollers(void *ctx)
1170 : {
1171 0 : struct spdk_thread *thread = ctx;
1172 : struct spdk_poller *poller, *tmp;
1173 :
1174 0 : TAILQ_FOREACH_REVERSE_SAFE(poller, &thread->active_pollers,
1175 : active_pollers_head, tailq, tmp) {
1176 0 : if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) {
1177 0 : TAILQ_REMOVE(&thread->active_pollers, poller, tailq);
1178 0 : free(poller);
1179 0 : }
1180 0 : }
1181 :
1182 0 : RB_FOREACH_SAFE(poller, timed_pollers_tree, &thread->timed_pollers, tmp) {
1183 0 : if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) {
1184 0 : poller_remove_timer(thread, poller);
1185 0 : free(poller);
1186 0 : }
1187 0 : }
1188 :
1189 0 : thread->poller_unregistered = false;
1190 0 : }
1191 :
1192 : static void
1193 0 : _thread_exit(void *ctx)
1194 : {
1195 0 : struct spdk_thread *thread = ctx;
1196 :
1197 0 : assert(thread->state == SPDK_THREAD_STATE_EXITING);
1198 :
1199 0 : thread_exit(thread, spdk_get_ticks());
1200 :
1201 0 : if (thread->state != SPDK_THREAD_STATE_EXITED) {
1202 0 : spdk_thread_send_msg(thread, _thread_exit, thread);
1203 0 : }
1204 0 : }
1205 :
1206 : int
1207 382900 : spdk_thread_poll(struct spdk_thread *thread, uint32_t max_msgs, uint64_t now)
1208 : {
1209 : struct spdk_thread *orig_thread;
1210 : int rc;
1211 :
1212 382900 : orig_thread = _get_thread();
1213 382900 : tls_thread = thread;
1214 :
1215 382900 : if (now == 0) {
1216 375717 : now = spdk_get_ticks();
1217 375717 : }
1218 :
1219 382900 : if (spdk_likely(!thread->in_interrupt)) {
1220 382900 : rc = thread_poll(thread, max_msgs, now);
1221 382900 : if (spdk_unlikely(thread->in_interrupt)) {
1222 : /* The thread transitioned to interrupt mode during the above poll.
1223 : * Poll it one more time in case that during the transition time
1224 : * there is msg received without notification.
1225 : */
1226 0 : rc = thread_poll(thread, max_msgs, now);
1227 0 : }
1228 :
1229 382900 : if (spdk_unlikely(thread->state == SPDK_THREAD_STATE_EXITING)) {
1230 198 : thread_exit(thread, now);
1231 198 : }
1232 382900 : } else {
1233 : /* Non-block wait on thread's fd_group */
1234 0 : rc = spdk_fd_group_wait(thread->fgrp, 0);
1235 : }
1236 :
1237 382900 : thread_update_stats(thread, spdk_get_ticks(), now, rc);
1238 :
1239 382900 : tls_thread = orig_thread;
1240 :
1241 382900 : return rc;
1242 : }
1243 :
1244 : uint64_t
1245 0 : spdk_thread_next_poller_expiration(struct spdk_thread *thread)
1246 : {
1247 : struct spdk_poller *poller;
1248 :
1249 0 : poller = thread->first_timed_poller;
1250 0 : if (poller) {
1251 0 : return poller->next_run_tick;
1252 : }
1253 :
1254 0 : return 0;
1255 0 : }
1256 :
1257 : int
1258 0 : spdk_thread_has_active_pollers(struct spdk_thread *thread)
1259 : {
1260 0 : return !TAILQ_EMPTY(&thread->active_pollers);
1261 : }
1262 :
1263 : static bool
1264 23 : thread_has_unpaused_pollers(struct spdk_thread *thread)
1265 : {
1266 23 : if (TAILQ_EMPTY(&thread->active_pollers) &&
1267 23 : RB_EMPTY(&thread->timed_pollers)) {
1268 23 : return false;
1269 : }
1270 :
1271 0 : return true;
1272 23 : }
1273 :
1274 : bool
1275 2 : spdk_thread_has_pollers(struct spdk_thread *thread)
1276 : {
1277 2 : if (!thread_has_unpaused_pollers(thread) &&
1278 2 : TAILQ_EMPTY(&thread->paused_pollers)) {
1279 2 : return false;
1280 : }
1281 :
1282 0 : return true;
1283 2 : }
1284 :
1285 : bool
1286 21 : spdk_thread_is_idle(struct spdk_thread *thread)
1287 : {
1288 42 : if (spdk_ring_count(thread->messages) ||
1289 21 : thread_has_unpaused_pollers(thread) ||
1290 21 : thread->critical_msg != NULL) {
1291 0 : return false;
1292 : }
1293 :
1294 21 : return true;
1295 21 : }
1296 :
1297 : uint32_t
1298 16 : spdk_thread_get_count(void)
1299 : {
1300 : /*
1301 : * Return cached value of the current thread count. We could acquire the
1302 : * lock and iterate through the TAILQ of threads to count them, but that
1303 : * count could still be invalidated after we release the lock.
1304 : */
1305 16 : return g_thread_count;
1306 : }
1307 :
1308 : struct spdk_thread *
1309 279698 : spdk_get_thread(void)
1310 : {
1311 279698 : return _get_thread();
1312 : }
1313 :
1314 : const char *
1315 4 : spdk_thread_get_name(const struct spdk_thread *thread)
1316 : {
1317 4 : return thread->name;
1318 : }
1319 :
1320 : uint64_t
1321 9 : spdk_thread_get_id(const struct spdk_thread *thread)
1322 : {
1323 9 : return thread->id;
1324 : }
1325 :
1326 : struct spdk_thread *
1327 9 : spdk_thread_get_by_id(uint64_t id)
1328 : {
1329 : struct spdk_thread *thread;
1330 :
1331 9 : if (id == 0 || id >= g_thread_id) {
1332 0 : SPDK_ERRLOG("invalid thread id: %" PRIu64 ".\n", id);
1333 0 : return NULL;
1334 : }
1335 9 : pthread_mutex_lock(&g_devlist_mutex);
1336 21 : TAILQ_FOREACH(thread, &g_threads, tailq) {
1337 21 : if (thread->id == id) {
1338 9 : break;
1339 : }
1340 12 : }
1341 9 : pthread_mutex_unlock(&g_devlist_mutex);
1342 9 : return thread;
1343 9 : }
1344 :
1345 : int
1346 47 : spdk_thread_get_stats(struct spdk_thread_stats *stats)
1347 : {
1348 : struct spdk_thread *thread;
1349 :
1350 47 : thread = _get_thread();
1351 47 : if (!thread) {
1352 0 : SPDK_ERRLOG("No thread allocated\n");
1353 0 : return -EINVAL;
1354 : }
1355 :
1356 47 : if (stats == NULL) {
1357 0 : return -EINVAL;
1358 : }
1359 :
1360 47 : *stats = thread->stats;
1361 :
1362 47 : return 0;
1363 47 : }
1364 :
1365 : uint64_t
1366 106881 : spdk_thread_get_last_tsc(struct spdk_thread *thread)
1367 : {
1368 106881 : if (thread == NULL) {
1369 0 : thread = _get_thread();
1370 0 : }
1371 :
1372 106881 : return thread->tsc_last;
1373 : }
1374 :
1375 : static inline int
1376 101084 : thread_send_msg_notification(const struct spdk_thread *target_thread)
1377 : {
1378 101084 : uint64_t notify = 1;
1379 : int rc;
1380 :
1381 : /* Not necessary to do notification if interrupt facility is not enabled */
1382 101084 : if (spdk_likely(!spdk_interrupt_mode_is_enabled())) {
1383 101084 : return 0;
1384 : }
1385 :
1386 : /* When each spdk_thread can switch between poll and interrupt mode dynamically,
1387 : * after sending thread msg, it is necessary to check whether target thread runs in
1388 : * interrupt mode and then decide whether do event notification.
1389 : */
1390 0 : if (spdk_unlikely(target_thread->in_interrupt)) {
1391 0 : rc = write(target_thread->msg_fd, ¬ify, sizeof(notify));
1392 0 : if (rc < 0) {
1393 0 : SPDK_ERRLOG("failed to notify msg_queue: %s.\n", spdk_strerror(errno));
1394 0 : return -EIO;
1395 : }
1396 0 : }
1397 :
1398 0 : return 0;
1399 101084 : }
1400 :
1401 : int
1402 101084 : spdk_thread_send_msg(const struct spdk_thread *thread, spdk_msg_fn fn, void *ctx)
1403 : {
1404 : struct spdk_thread *local_thread;
1405 : struct spdk_msg *msg;
1406 : int rc;
1407 :
1408 101084 : assert(thread != NULL);
1409 :
1410 101084 : if (spdk_unlikely(thread->state == SPDK_THREAD_STATE_EXITED)) {
1411 0 : SPDK_ERRLOG("Thread %s is marked as exited.\n", thread->name);
1412 0 : return -EIO;
1413 : }
1414 :
1415 101084 : local_thread = _get_thread();
1416 :
1417 101084 : msg = NULL;
1418 101084 : if (local_thread != NULL) {
1419 101084 : if (local_thread->msg_cache_count > 0) {
1420 101084 : msg = SLIST_FIRST(&local_thread->msg_cache);
1421 101084 : assert(msg != NULL);
1422 101084 : SLIST_REMOVE_HEAD(&local_thread->msg_cache, link);
1423 101084 : local_thread->msg_cache_count--;
1424 101084 : }
1425 101084 : }
1426 :
1427 101084 : if (msg == NULL) {
1428 0 : msg = spdk_mempool_get(g_spdk_msg_mempool);
1429 0 : if (!msg) {
1430 0 : SPDK_ERRLOG("msg could not be allocated\n");
1431 0 : return -ENOMEM;
1432 : }
1433 0 : }
1434 :
1435 101084 : msg->fn = fn;
1436 101084 : msg->arg = ctx;
1437 :
1438 101084 : rc = spdk_ring_enqueue(thread->messages, (void **)&msg, 1, NULL);
1439 101084 : if (rc != 1) {
1440 0 : SPDK_ERRLOG("msg could not be enqueued\n");
1441 0 : spdk_mempool_put(g_spdk_msg_mempool, msg);
1442 0 : return -EIO;
1443 : }
1444 :
1445 101084 : return thread_send_msg_notification(thread);
1446 101084 : }
1447 :
1448 : int
1449 0 : spdk_thread_send_critical_msg(struct spdk_thread *thread, spdk_msg_fn fn)
1450 : {
1451 0 : spdk_msg_fn expected = NULL;
1452 :
1453 0 : if (!__atomic_compare_exchange_n(&thread->critical_msg, &expected, fn, false, __ATOMIC_SEQ_CST,
1454 : __ATOMIC_SEQ_CST)) {
1455 0 : return -EIO;
1456 : }
1457 :
1458 0 : return thread_send_msg_notification(thread);
1459 0 : }
1460 :
1461 : #ifdef __linux__
1462 : static int
1463 : interrupt_timerfd_process(void *arg)
1464 : {
1465 : struct spdk_poller *poller = arg;
1466 : uint64_t exp;
1467 : int rc;
1468 :
1469 : /* clear the level of interval timer */
1470 : rc = read(poller->intr->efd, &exp, sizeof(exp));
1471 : if (rc < 0) {
1472 : if (rc == -EAGAIN) {
1473 : return 0;
1474 : }
1475 :
1476 : return rc;
1477 : }
1478 :
1479 : SPDK_DTRACE_PROBE2(timerfd_exec, poller->fn, poller->arg);
1480 :
1481 : return poller->fn(poller->arg);
1482 : }
1483 :
1484 : static int
1485 : period_poller_interrupt_init(struct spdk_poller *poller)
1486 : {
1487 : int timerfd;
1488 :
1489 : SPDK_DEBUGLOG(thread, "timerfd init for periodic poller %s\n", poller->name);
1490 : timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
1491 : if (timerfd < 0) {
1492 : return -errno;
1493 : }
1494 :
1495 : poller->intr = spdk_interrupt_register(timerfd, interrupt_timerfd_process, poller, poller->name);
1496 : if (poller->intr == NULL) {
1497 : close(timerfd);
1498 : return -1;
1499 : }
1500 :
1501 : return 0;
1502 : }
1503 :
1504 : static void
1505 : period_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bool interrupt_mode)
1506 : {
1507 : int timerfd;
1508 : uint64_t now_tick = spdk_get_ticks();
1509 : uint64_t ticks = spdk_get_ticks_hz();
1510 : int ret;
1511 : struct itimerspec new_tv = {};
1512 : struct itimerspec old_tv = {};
1513 :
1514 : assert(poller->intr != NULL);
1515 : assert(poller->period_ticks != 0);
1516 :
1517 : timerfd = poller->intr->efd;
1518 :
1519 : assert(timerfd >= 0);
1520 :
1521 : SPDK_DEBUGLOG(thread, "timerfd set poller %s into %s mode\n", poller->name,
1522 : interrupt_mode ? "interrupt" : "poll");
1523 :
1524 : if (interrupt_mode) {
1525 : /* Set repeated timer expiration */
1526 : new_tv.it_interval.tv_sec = poller->period_ticks / ticks;
1527 : new_tv.it_interval.tv_nsec = poller->period_ticks % ticks * SPDK_SEC_TO_NSEC / ticks;
1528 :
1529 : /* Update next timer expiration */
1530 : if (poller->next_run_tick == 0) {
1531 : poller->next_run_tick = now_tick + poller->period_ticks;
1532 : } else if (poller->next_run_tick < now_tick) {
1533 : poller->next_run_tick = now_tick;
1534 : }
1535 :
1536 : new_tv.it_value.tv_sec = (poller->next_run_tick - now_tick) / ticks;
1537 : new_tv.it_value.tv_nsec = (poller->next_run_tick - now_tick) % ticks * SPDK_SEC_TO_NSEC / ticks;
1538 :
1539 : ret = timerfd_settime(timerfd, 0, &new_tv, NULL);
1540 : if (ret < 0) {
1541 : SPDK_ERRLOG("Failed to arm timerfd: error(%d)\n", errno);
1542 : assert(false);
1543 : }
1544 : } else {
1545 : /* Disarm the timer */
1546 : ret = timerfd_settime(timerfd, 0, &new_tv, &old_tv);
1547 : if (ret < 0) {
1548 : /* timerfd_settime's failure indicates that the timerfd is in error */
1549 : SPDK_ERRLOG("Failed to disarm timerfd: error(%d)\n", errno);
1550 : assert(false);
1551 : }
1552 :
1553 : /* In order to reuse poller_insert_timer, fix now_tick, so next_run_tick would be
1554 : * now_tick + ticks * old_tv.it_value.tv_sec + (ticks * old_tv.it_value.tv_nsec) / SPDK_SEC_TO_NSEC
1555 : */
1556 : now_tick = now_tick - poller->period_ticks + ticks * old_tv.it_value.tv_sec + \
1557 : (ticks * old_tv.it_value.tv_nsec) / SPDK_SEC_TO_NSEC;
1558 : poller_remove_timer(poller->thread, poller);
1559 : poller_insert_timer(poller->thread, poller, now_tick);
1560 : }
1561 : }
1562 :
1563 : static void
1564 : poller_interrupt_fini(struct spdk_poller *poller)
1565 : {
1566 : int fd;
1567 :
1568 : SPDK_DEBUGLOG(thread, "interrupt fini for poller %s\n", poller->name);
1569 : assert(poller->intr != NULL);
1570 : fd = poller->intr->efd;
1571 : spdk_interrupt_unregister(&poller->intr);
1572 : close(fd);
1573 : }
1574 :
1575 : static int
1576 : busy_poller_interrupt_init(struct spdk_poller *poller)
1577 : {
1578 : int busy_efd;
1579 :
1580 : SPDK_DEBUGLOG(thread, "busy_efd init for busy poller %s\n", poller->name);
1581 : busy_efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1582 : if (busy_efd < 0) {
1583 : SPDK_ERRLOG("Failed to create eventfd for Poller(%s).\n", poller->name);
1584 : return -errno;
1585 : }
1586 :
1587 : poller->intr = spdk_interrupt_register(busy_efd, poller->fn, poller->arg, poller->name);
1588 : if (poller->intr == NULL) {
1589 : close(busy_efd);
1590 : return -1;
1591 : }
1592 :
1593 : return 0;
1594 : }
1595 :
1596 : static void
1597 : busy_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bool interrupt_mode)
1598 : {
1599 : int busy_efd = poller->intr->efd;
1600 : uint64_t notify = 1;
1601 : int rc __attribute__((unused));
1602 :
1603 : assert(busy_efd >= 0);
1604 :
1605 : if (interrupt_mode) {
1606 : /* Write without read on eventfd will get it repeatedly triggered. */
1607 : if (write(busy_efd, ¬ify, sizeof(notify)) < 0) {
1608 : SPDK_ERRLOG("Failed to set busy wait for Poller(%s).\n", poller->name);
1609 : }
1610 : } else {
1611 : /* Read on eventfd will clear its level triggering. */
1612 : rc = read(busy_efd, ¬ify, sizeof(notify));
1613 : }
1614 : }
1615 :
1616 : #else
1617 :
1618 : static int
1619 0 : period_poller_interrupt_init(struct spdk_poller *poller)
1620 : {
1621 0 : return -ENOTSUP;
1622 : }
1623 :
1624 : static void
1625 0 : period_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bool interrupt_mode)
1626 : {
1627 0 : }
1628 :
1629 : static void
1630 0 : poller_interrupt_fini(struct spdk_poller *poller)
1631 : {
1632 0 : }
1633 :
1634 : static int
1635 0 : busy_poller_interrupt_init(struct spdk_poller *poller)
1636 : {
1637 0 : return -ENOTSUP;
1638 : }
1639 :
1640 : static void
1641 0 : busy_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bool interrupt_mode)
1642 : {
1643 0 : }
1644 :
1645 : #endif
1646 :
1647 : void
1648 7 : spdk_poller_register_interrupt(struct spdk_poller *poller,
1649 : spdk_poller_set_interrupt_mode_cb cb_fn,
1650 : void *cb_arg)
1651 : {
1652 7 : assert(poller != NULL);
1653 7 : assert(spdk_get_thread() == poller->thread);
1654 :
1655 7 : if (!spdk_interrupt_mode_is_enabled()) {
1656 7 : return;
1657 : }
1658 :
1659 : /* If this poller already had an interrupt, clean the old one up. */
1660 0 : if (poller->intr != NULL) {
1661 0 : poller_interrupt_fini(poller);
1662 0 : }
1663 :
1664 0 : poller->set_intr_cb_fn = cb_fn;
1665 0 : poller->set_intr_cb_arg = cb_arg;
1666 :
1667 : /* Set poller into interrupt mode if thread is in interrupt. */
1668 0 : if (poller->thread->in_interrupt && poller->set_intr_cb_fn) {
1669 0 : poller->set_intr_cb_fn(poller, poller->set_intr_cb_arg, true);
1670 0 : }
1671 7 : }
1672 :
1673 : static uint64_t
1674 869 : convert_us_to_ticks(uint64_t us)
1675 : {
1676 : uint64_t quotient, remainder, ticks;
1677 :
1678 869 : if (us) {
1679 353 : quotient = us / SPDK_SEC_TO_USEC;
1680 353 : remainder = us % SPDK_SEC_TO_USEC;
1681 353 : ticks = spdk_get_ticks_hz();
1682 :
1683 353 : return ticks * quotient + (ticks * remainder) / SPDK_SEC_TO_USEC;
1684 : } else {
1685 516 : return 0;
1686 : }
1687 869 : }
1688 :
1689 : static struct spdk_poller *
1690 869 : poller_register(spdk_poller_fn fn,
1691 : void *arg,
1692 : uint64_t period_microseconds,
1693 : const char *name)
1694 : {
1695 : struct spdk_thread *thread;
1696 : struct spdk_poller *poller;
1697 :
1698 869 : thread = spdk_get_thread();
1699 869 : if (!thread) {
1700 0 : assert(false);
1701 : return NULL;
1702 : }
1703 :
1704 869 : if (spdk_unlikely(thread->state == SPDK_THREAD_STATE_EXITED)) {
1705 0 : SPDK_ERRLOG("thread %s is marked as exited\n", thread->name);
1706 0 : return NULL;
1707 : }
1708 :
1709 869 : poller = calloc(1, sizeof(*poller));
1710 869 : if (poller == NULL) {
1711 0 : SPDK_ERRLOG("Poller memory allocation failed\n");
1712 0 : return NULL;
1713 : }
1714 :
1715 869 : if (name) {
1716 814 : snprintf(poller->name, sizeof(poller->name), "%s", name);
1717 814 : } else {
1718 55 : snprintf(poller->name, sizeof(poller->name), "%p", fn);
1719 : }
1720 :
1721 869 : poller->state = SPDK_POLLER_STATE_WAITING;
1722 869 : poller->fn = fn;
1723 869 : poller->arg = arg;
1724 869 : poller->thread = thread;
1725 869 : poller->intr = NULL;
1726 869 : if (thread->next_poller_id == 0) {
1727 0 : SPDK_WARNLOG("Poller ID rolled over. Poller ID is duplicated.\n");
1728 0 : thread->next_poller_id = 1;
1729 0 : }
1730 869 : poller->id = thread->next_poller_id++;
1731 :
1732 869 : poller->period_ticks = convert_us_to_ticks(period_microseconds);
1733 :
1734 869 : if (spdk_interrupt_mode_is_enabled()) {
1735 : int rc;
1736 :
1737 0 : if (period_microseconds) {
1738 0 : rc = period_poller_interrupt_init(poller);
1739 0 : if (rc < 0) {
1740 0 : SPDK_ERRLOG("Failed to register interruptfd for periodic poller: %s\n", spdk_strerror(-rc));
1741 0 : free(poller);
1742 0 : return NULL;
1743 : }
1744 :
1745 0 : poller->set_intr_cb_fn = period_poller_set_interrupt_mode;
1746 0 : poller->set_intr_cb_arg = NULL;
1747 :
1748 0 : } else {
1749 : /* If the poller doesn't have a period, create interruptfd that's always
1750 : * busy automatically when running in interrupt mode.
1751 : */
1752 0 : rc = busy_poller_interrupt_init(poller);
1753 0 : if (rc > 0) {
1754 0 : SPDK_ERRLOG("Failed to register interruptfd for busy poller: %s\n", spdk_strerror(-rc));
1755 0 : free(poller);
1756 0 : return NULL;
1757 : }
1758 :
1759 0 : poller->set_intr_cb_fn = busy_poller_set_interrupt_mode;
1760 0 : poller->set_intr_cb_arg = NULL;
1761 : }
1762 :
1763 : /* Set poller into interrupt mode if thread is in interrupt. */
1764 0 : if (poller->thread->in_interrupt) {
1765 0 : poller->set_intr_cb_fn(poller, poller->set_intr_cb_arg, true);
1766 0 : }
1767 0 : }
1768 :
1769 869 : thread_insert_poller(thread, poller);
1770 :
1771 869 : return poller;
1772 869 : }
1773 :
1774 : struct spdk_poller *
1775 55 : spdk_poller_register(spdk_poller_fn fn,
1776 : void *arg,
1777 : uint64_t period_microseconds)
1778 : {
1779 55 : return poller_register(fn, arg, period_microseconds, NULL);
1780 : }
1781 :
1782 : struct spdk_poller *
1783 814 : spdk_poller_register_named(spdk_poller_fn fn,
1784 : void *arg,
1785 : uint64_t period_microseconds,
1786 : const char *name)
1787 : {
1788 814 : return poller_register(fn, arg, period_microseconds, name);
1789 : }
1790 :
1791 : static void
1792 0 : wrong_thread(const char *func, const char *name, struct spdk_thread *thread,
1793 : struct spdk_thread *curthread)
1794 : {
1795 0 : if (thread == NULL) {
1796 0 : SPDK_ERRLOG("%s(%s) called with NULL thread\n", func, name);
1797 0 : abort();
1798 : }
1799 0 : SPDK_ERRLOG("%s(%s) called from wrong thread %s:%" PRIu64 " (should be "
1800 : "%s:%" PRIu64 ")\n", func, name, curthread->name, curthread->id,
1801 : thread->name, thread->id);
1802 0 : assert(false);
1803 : }
1804 :
1805 : void
1806 1315 : spdk_poller_unregister(struct spdk_poller **ppoller)
1807 : {
1808 : struct spdk_thread *thread;
1809 : struct spdk_poller *poller;
1810 :
1811 1315 : poller = *ppoller;
1812 1315 : if (poller == NULL) {
1813 446 : return;
1814 : }
1815 :
1816 869 : *ppoller = NULL;
1817 :
1818 869 : thread = spdk_get_thread();
1819 869 : if (!thread) {
1820 0 : assert(false);
1821 : return;
1822 : }
1823 :
1824 869 : if (poller->thread != thread) {
1825 0 : wrong_thread(__func__, poller->name, poller->thread, thread);
1826 0 : return;
1827 : }
1828 :
1829 869 : if (spdk_interrupt_mode_is_enabled()) {
1830 : /* Release the interrupt resource for period or busy poller */
1831 0 : if (poller->intr != NULL) {
1832 0 : poller_interrupt_fini(poller);
1833 0 : }
1834 :
1835 : /* If there is not already a pending poller removal, generate
1836 : * a message to go process removals. */
1837 0 : if (!thread->poller_unregistered) {
1838 0 : thread->poller_unregistered = true;
1839 0 : spdk_thread_send_msg(thread, _thread_remove_pollers, thread);
1840 0 : }
1841 0 : }
1842 :
1843 : /* If the poller was paused, put it on the active_pollers list so that
1844 : * its unregistration can be processed by spdk_thread_poll().
1845 : */
1846 869 : if (poller->state == SPDK_POLLER_STATE_PAUSED) {
1847 9 : TAILQ_REMOVE(&thread->paused_pollers, poller, tailq);
1848 9 : TAILQ_INSERT_TAIL(&thread->active_pollers, poller, tailq);
1849 9 : poller->period_ticks = 0;
1850 9 : }
1851 :
1852 : /* Simply set the state to unregistered. The poller will get cleaned up
1853 : * in a subsequent call to spdk_thread_poll().
1854 : */
1855 869 : poller->state = SPDK_POLLER_STATE_UNREGISTERED;
1856 1315 : }
1857 :
1858 : void
1859 41 : spdk_poller_pause(struct spdk_poller *poller)
1860 : {
1861 : struct spdk_thread *thread;
1862 :
1863 41 : thread = spdk_get_thread();
1864 41 : if (!thread) {
1865 0 : assert(false);
1866 : return;
1867 : }
1868 :
1869 41 : if (poller->thread != thread) {
1870 0 : wrong_thread(__func__, poller->name, poller->thread, thread);
1871 0 : return;
1872 : }
1873 :
1874 : /* We just set its state to SPDK_POLLER_STATE_PAUSING and let
1875 : * spdk_thread_poll() move it. It allows a poller to be paused from
1876 : * another one's context without breaking the TAILQ_FOREACH_REVERSE_SAFE
1877 : * iteration, or from within itself without breaking the logic to always
1878 : * remove the closest timed poller in the TAILQ_FOREACH_SAFE iteration.
1879 : */
1880 41 : switch (poller->state) {
1881 : case SPDK_POLLER_STATE_PAUSED:
1882 : case SPDK_POLLER_STATE_PAUSING:
1883 2 : break;
1884 : case SPDK_POLLER_STATE_RUNNING:
1885 : case SPDK_POLLER_STATE_WAITING:
1886 39 : poller->state = SPDK_POLLER_STATE_PAUSING;
1887 39 : break;
1888 : default:
1889 0 : assert(false);
1890 : break;
1891 : }
1892 41 : }
1893 :
1894 : void
1895 40 : spdk_poller_resume(struct spdk_poller *poller)
1896 : {
1897 : struct spdk_thread *thread;
1898 :
1899 40 : thread = spdk_get_thread();
1900 40 : if (!thread) {
1901 0 : assert(false);
1902 : return;
1903 : }
1904 :
1905 40 : if (poller->thread != thread) {
1906 0 : wrong_thread(__func__, poller->name, poller->thread, thread);
1907 0 : return;
1908 : }
1909 :
1910 : /* If a poller is paused it has to be removed from the paused pollers
1911 : * list and put on the active list or timer tree depending on its
1912 : * period_ticks. If a poller is still in the process of being paused,
1913 : * we just need to flip its state back to waiting, as it's already on
1914 : * the appropriate list or tree.
1915 : */
1916 40 : switch (poller->state) {
1917 : case SPDK_POLLER_STATE_PAUSED:
1918 20 : TAILQ_REMOVE(&thread->paused_pollers, poller, tailq);
1919 20 : thread_insert_poller(thread, poller);
1920 : /* fallthrough */
1921 : case SPDK_POLLER_STATE_PAUSING:
1922 29 : poller->state = SPDK_POLLER_STATE_WAITING;
1923 29 : break;
1924 : case SPDK_POLLER_STATE_RUNNING:
1925 : case SPDK_POLLER_STATE_WAITING:
1926 11 : break;
1927 : default:
1928 0 : assert(false);
1929 : break;
1930 : }
1931 40 : }
1932 :
1933 : const char *
1934 2 : spdk_poller_get_name(struct spdk_poller *poller)
1935 : {
1936 2 : return poller->name;
1937 : }
1938 :
1939 : uint64_t
1940 3 : spdk_poller_get_id(struct spdk_poller *poller)
1941 : {
1942 3 : return poller->id;
1943 : }
1944 :
1945 : const char *
1946 9 : spdk_poller_get_state_str(struct spdk_poller *poller)
1947 : {
1948 9 : switch (poller->state) {
1949 : case SPDK_POLLER_STATE_WAITING:
1950 4 : return "waiting";
1951 : case SPDK_POLLER_STATE_RUNNING:
1952 2 : return "running";
1953 : case SPDK_POLLER_STATE_UNREGISTERED:
1954 0 : return "unregistered";
1955 : case SPDK_POLLER_STATE_PAUSING:
1956 1 : return "pausing";
1957 : case SPDK_POLLER_STATE_PAUSED:
1958 2 : return "paused";
1959 : default:
1960 0 : return NULL;
1961 : }
1962 9 : }
1963 :
1964 : uint64_t
1965 2 : spdk_poller_get_period_ticks(struct spdk_poller *poller)
1966 : {
1967 2 : return poller->period_ticks;
1968 : }
1969 :
1970 : void
1971 2 : spdk_poller_get_stats(struct spdk_poller *poller, struct spdk_poller_stats *stats)
1972 : {
1973 2 : stats->run_count = poller->run_count;
1974 2 : stats->busy_count = poller->busy_count;
1975 2 : }
1976 :
1977 : struct spdk_poller *
1978 0 : spdk_thread_get_first_active_poller(struct spdk_thread *thread)
1979 : {
1980 0 : return TAILQ_FIRST(&thread->active_pollers);
1981 : }
1982 :
1983 : struct spdk_poller *
1984 0 : spdk_thread_get_next_active_poller(struct spdk_poller *prev)
1985 : {
1986 0 : return TAILQ_NEXT(prev, tailq);
1987 : }
1988 :
1989 : struct spdk_poller *
1990 0 : spdk_thread_get_first_timed_poller(struct spdk_thread *thread)
1991 : {
1992 0 : return RB_MIN(timed_pollers_tree, &thread->timed_pollers);
1993 : }
1994 :
1995 : struct spdk_poller *
1996 0 : spdk_thread_get_next_timed_poller(struct spdk_poller *prev)
1997 : {
1998 0 : return RB_NEXT(timed_pollers_tree, &thread->timed_pollers, prev);
1999 : }
2000 :
2001 : struct spdk_poller *
2002 0 : spdk_thread_get_first_paused_poller(struct spdk_thread *thread)
2003 : {
2004 0 : return TAILQ_FIRST(&thread->paused_pollers);
2005 : }
2006 :
2007 : struct spdk_poller *
2008 0 : spdk_thread_get_next_paused_poller(struct spdk_poller *prev)
2009 : {
2010 0 : return TAILQ_NEXT(prev, tailq);
2011 : }
2012 :
2013 : struct spdk_io_channel *
2014 0 : spdk_thread_get_first_io_channel(struct spdk_thread *thread)
2015 : {
2016 0 : return RB_MIN(io_channel_tree, &thread->io_channels);
2017 : }
2018 :
2019 : struct spdk_io_channel *
2020 0 : spdk_thread_get_next_io_channel(struct spdk_io_channel *prev)
2021 : {
2022 0 : return RB_NEXT(io_channel_tree, &thread->io_channels, prev);
2023 : }
2024 :
2025 : uint16_t
2026 0 : spdk_thread_get_trace_id(struct spdk_thread *thread)
2027 : {
2028 0 : return thread->trace_id;
2029 : }
2030 :
2031 : struct call_thread {
2032 : struct spdk_thread *cur_thread;
2033 : spdk_msg_fn fn;
2034 : void *ctx;
2035 :
2036 : struct spdk_thread *orig_thread;
2037 : spdk_msg_fn cpl;
2038 : };
2039 :
2040 : static void
2041 2 : _back_to_orig_thread(void *ctx)
2042 : {
2043 2 : struct call_thread *ct = ctx;
2044 :
2045 2 : assert(ct->orig_thread->for_each_count > 0);
2046 2 : ct->orig_thread->for_each_count--;
2047 :
2048 2 : ct->cpl(ct->ctx);
2049 2 : free(ctx);
2050 2 : }
2051 :
2052 : static void
2053 6 : _on_thread(void *ctx)
2054 : {
2055 6 : struct call_thread *ct = ctx;
2056 : int rc __attribute__((unused));
2057 :
2058 6 : ct->fn(ct->ctx);
2059 :
2060 6 : pthread_mutex_lock(&g_devlist_mutex);
2061 6 : ct->cur_thread = TAILQ_NEXT(ct->cur_thread, tailq);
2062 6 : while (ct->cur_thread && ct->cur_thread->state != SPDK_THREAD_STATE_RUNNING) {
2063 0 : SPDK_DEBUGLOG(thread, "thread %s is not running but still not destroyed.\n",
2064 : ct->cur_thread->name);
2065 0 : ct->cur_thread = TAILQ_NEXT(ct->cur_thread, tailq);
2066 : }
2067 6 : pthread_mutex_unlock(&g_devlist_mutex);
2068 :
2069 6 : if (!ct->cur_thread) {
2070 2 : SPDK_DEBUGLOG(thread, "Completed thread iteration\n");
2071 :
2072 2 : rc = spdk_thread_send_msg(ct->orig_thread, _back_to_orig_thread, ctx);
2073 2 : } else {
2074 4 : SPDK_DEBUGLOG(thread, "Continuing thread iteration to %s\n",
2075 : ct->cur_thread->name);
2076 :
2077 4 : rc = spdk_thread_send_msg(ct->cur_thread, _on_thread, ctx);
2078 : }
2079 6 : assert(rc == 0);
2080 6 : }
2081 :
2082 : void
2083 2 : spdk_for_each_thread(spdk_msg_fn fn, void *ctx, spdk_msg_fn cpl)
2084 : {
2085 : struct call_thread *ct;
2086 : struct spdk_thread *thread;
2087 : int rc __attribute__((unused));
2088 :
2089 2 : ct = calloc(1, sizeof(*ct));
2090 2 : if (!ct) {
2091 0 : SPDK_ERRLOG("Unable to perform thread iteration\n");
2092 0 : cpl(ctx);
2093 0 : return;
2094 : }
2095 :
2096 2 : ct->fn = fn;
2097 2 : ct->ctx = ctx;
2098 2 : ct->cpl = cpl;
2099 :
2100 2 : thread = _get_thread();
2101 2 : if (!thread) {
2102 0 : SPDK_ERRLOG("No thread allocated\n");
2103 0 : free(ct);
2104 0 : cpl(ctx);
2105 0 : return;
2106 : }
2107 2 : ct->orig_thread = thread;
2108 :
2109 2 : ct->orig_thread->for_each_count++;
2110 :
2111 2 : pthread_mutex_lock(&g_devlist_mutex);
2112 2 : ct->cur_thread = TAILQ_FIRST(&g_threads);
2113 2 : pthread_mutex_unlock(&g_devlist_mutex);
2114 :
2115 2 : SPDK_DEBUGLOG(thread, "Starting thread iteration from %s\n",
2116 : ct->orig_thread->name);
2117 :
2118 2 : rc = spdk_thread_send_msg(ct->cur_thread, _on_thread, ct);
2119 2 : assert(rc == 0);
2120 2 : }
2121 :
2122 : static inline void
2123 0 : poller_set_interrupt_mode(struct spdk_poller *poller, bool interrupt_mode)
2124 : {
2125 0 : if (poller->state == SPDK_POLLER_STATE_UNREGISTERED) {
2126 0 : return;
2127 : }
2128 :
2129 0 : if (poller->set_intr_cb_fn) {
2130 0 : poller->set_intr_cb_fn(poller, poller->set_intr_cb_arg, interrupt_mode);
2131 0 : }
2132 0 : }
2133 :
2134 : void
2135 0 : spdk_thread_set_interrupt_mode(bool enable_interrupt)
2136 : {
2137 0 : struct spdk_thread *thread = _get_thread();
2138 : struct spdk_poller *poller, *tmp;
2139 :
2140 0 : assert(thread);
2141 0 : assert(spdk_interrupt_mode_is_enabled());
2142 :
2143 0 : SPDK_NOTICELOG("Set spdk_thread (%s) to %s mode from %s mode.\n",
2144 : thread->name, enable_interrupt ? "intr" : "poll",
2145 : thread->in_interrupt ? "intr" : "poll");
2146 :
2147 0 : if (thread->in_interrupt == enable_interrupt) {
2148 0 : return;
2149 : }
2150 :
2151 : /* Set pollers to expected mode */
2152 0 : RB_FOREACH_SAFE(poller, timed_pollers_tree, &thread->timed_pollers, tmp) {
2153 0 : poller_set_interrupt_mode(poller, enable_interrupt);
2154 0 : }
2155 0 : TAILQ_FOREACH_SAFE(poller, &thread->active_pollers, tailq, tmp) {
2156 0 : poller_set_interrupt_mode(poller, enable_interrupt);
2157 0 : }
2158 : /* All paused pollers will go to work in interrupt mode */
2159 0 : TAILQ_FOREACH_SAFE(poller, &thread->paused_pollers, tailq, tmp) {
2160 0 : poller_set_interrupt_mode(poller, enable_interrupt);
2161 0 : }
2162 :
2163 0 : thread->in_interrupt = enable_interrupt;
2164 0 : return;
2165 0 : }
2166 :
2167 : static struct io_device *
2168 6652 : io_device_get(void *io_device)
2169 : {
2170 6652 : struct io_device find = {};
2171 :
2172 6652 : find.io_device = io_device;
2173 6652 : return RB_FIND(io_device_tree, &g_io_devices, &find);
2174 : }
2175 :
2176 : void
2177 1769 : spdk_io_device_register(void *io_device, spdk_io_channel_create_cb create_cb,
2178 : spdk_io_channel_destroy_cb destroy_cb, uint32_t ctx_size,
2179 : const char *name)
2180 : {
2181 : struct io_device *dev, *tmp;
2182 : struct spdk_thread *thread;
2183 :
2184 1769 : assert(io_device != NULL);
2185 1769 : assert(create_cb != NULL);
2186 1769 : assert(destroy_cb != NULL);
2187 :
2188 1769 : thread = spdk_get_thread();
2189 1769 : if (!thread) {
2190 0 : SPDK_ERRLOG("called from non-SPDK thread\n");
2191 0 : assert(false);
2192 : return;
2193 : }
2194 :
2195 1769 : dev = calloc(1, sizeof(struct io_device));
2196 1769 : if (dev == NULL) {
2197 0 : SPDK_ERRLOG("could not allocate io_device\n");
2198 0 : return;
2199 : }
2200 :
2201 1769 : dev->io_device = io_device;
2202 1769 : if (name) {
2203 1655 : snprintf(dev->name, sizeof(dev->name), "%s", name);
2204 1655 : } else {
2205 114 : snprintf(dev->name, sizeof(dev->name), "%p", dev);
2206 : }
2207 1769 : dev->create_cb = create_cb;
2208 1769 : dev->destroy_cb = destroy_cb;
2209 1769 : dev->unregister_cb = NULL;
2210 1769 : dev->ctx_size = ctx_size;
2211 1769 : dev->for_each_count = 0;
2212 1769 : dev->unregistered = false;
2213 1769 : dev->refcnt = 0;
2214 :
2215 1769 : SPDK_DEBUGLOG(thread, "Registering io_device %s (%p) on thread %s\n",
2216 : dev->name, dev->io_device, thread->name);
2217 :
2218 1769 : pthread_mutex_lock(&g_devlist_mutex);
2219 1769 : tmp = RB_INSERT(io_device_tree, &g_io_devices, dev);
2220 1769 : if (tmp != NULL) {
2221 2 : SPDK_ERRLOG("io_device %p already registered (old:%s new:%s)\n",
2222 : io_device, tmp->name, dev->name);
2223 2 : free(dev);
2224 2 : }
2225 :
2226 1769 : pthread_mutex_unlock(&g_devlist_mutex);
2227 1769 : }
2228 :
2229 : static void
2230 1584 : _finish_unregister(void *arg)
2231 : {
2232 1584 : struct io_device *dev = arg;
2233 : struct spdk_thread *thread;
2234 :
2235 1584 : thread = spdk_get_thread();
2236 1584 : assert(thread == dev->unregister_thread);
2237 :
2238 1584 : SPDK_DEBUGLOG(thread, "Finishing unregistration of io_device %s (%p) on thread %s\n",
2239 : dev->name, dev->io_device, thread->name);
2240 :
2241 1584 : assert(thread->pending_unregister_count > 0);
2242 1584 : thread->pending_unregister_count--;
2243 :
2244 1584 : dev->unregister_cb(dev->io_device);
2245 1584 : free(dev);
2246 1584 : }
2247 :
2248 : static void
2249 1766 : io_device_free(struct io_device *dev)
2250 : {
2251 : int rc __attribute__((unused));
2252 :
2253 1766 : if (dev->unregister_cb == NULL) {
2254 182 : free(dev);
2255 182 : } else {
2256 1584 : assert(dev->unregister_thread != NULL);
2257 1584 : SPDK_DEBUGLOG(thread, "io_device %s (%p) needs to unregister from thread %s\n",
2258 : dev->name, dev->io_device, dev->unregister_thread->name);
2259 1584 : rc = spdk_thread_send_msg(dev->unregister_thread, _finish_unregister, dev);
2260 1584 : assert(rc == 0);
2261 : }
2262 1766 : }
2263 :
2264 : void
2265 1768 : spdk_io_device_unregister(void *io_device, spdk_io_device_unregister_cb unregister_cb)
2266 : {
2267 : struct io_device *dev;
2268 : uint32_t refcnt;
2269 : struct spdk_thread *thread;
2270 :
2271 1768 : thread = spdk_get_thread();
2272 1768 : if (!thread) {
2273 0 : SPDK_ERRLOG("called from non-SPDK thread\n");
2274 0 : assert(false);
2275 : return;
2276 : }
2277 :
2278 1768 : pthread_mutex_lock(&g_devlist_mutex);
2279 1768 : dev = io_device_get(io_device);
2280 1768 : if (!dev) {
2281 0 : SPDK_ERRLOG("io_device %p not found\n", io_device);
2282 0 : assert(false);
2283 : pthread_mutex_unlock(&g_devlist_mutex);
2284 : return;
2285 : }
2286 :
2287 : /* The for_each_count check differentiates the user attempting to unregister the
2288 : * device a second time, from the internal call to this function that occurs
2289 : * after the for_each_count reaches 0.
2290 : */
2291 1768 : if (dev->pending_unregister && dev->for_each_count > 0) {
2292 0 : SPDK_ERRLOG("io_device %p already has a pending unregister\n", io_device);
2293 0 : assert(false);
2294 : pthread_mutex_unlock(&g_devlist_mutex);
2295 : return;
2296 : }
2297 :
2298 1768 : dev->unregister_cb = unregister_cb;
2299 1768 : dev->unregister_thread = thread;
2300 :
2301 1768 : if (dev->for_each_count > 0) {
2302 1 : SPDK_WARNLOG("io_device %s (%p) has %u for_each calls outstanding\n",
2303 : dev->name, io_device, dev->for_each_count);
2304 1 : dev->pending_unregister = true;
2305 1 : pthread_mutex_unlock(&g_devlist_mutex);
2306 1 : return;
2307 : }
2308 :
2309 1767 : dev->unregistered = true;
2310 1767 : RB_REMOVE(io_device_tree, &g_io_devices, dev);
2311 1767 : refcnt = dev->refcnt;
2312 1767 : pthread_mutex_unlock(&g_devlist_mutex);
2313 :
2314 1767 : SPDK_DEBUGLOG(thread, "Unregistering io_device %s (%p) from thread %s\n",
2315 : dev->name, dev->io_device, thread->name);
2316 :
2317 1767 : if (unregister_cb) {
2318 1584 : thread->pending_unregister_count++;
2319 1584 : }
2320 :
2321 1767 : if (refcnt > 0) {
2322 : /* defer deletion */
2323 1009 : return;
2324 : }
2325 :
2326 758 : io_device_free(dev);
2327 1768 : }
2328 :
2329 : const char *
2330 0 : spdk_io_device_get_name(struct io_device *dev)
2331 : {
2332 0 : return dev->name;
2333 : }
2334 :
2335 : static struct spdk_io_channel *
2336 8924 : thread_get_io_channel(struct spdk_thread *thread, struct io_device *dev)
2337 : {
2338 8924 : struct spdk_io_channel find = {};
2339 :
2340 8924 : find.dev = dev;
2341 8924 : return RB_FIND(io_channel_tree, &thread->io_channels, &find);
2342 : }
2343 :
2344 : struct spdk_io_channel *
2345 3028 : spdk_get_io_channel(void *io_device)
2346 : {
2347 : struct spdk_io_channel *ch;
2348 : struct spdk_thread *thread;
2349 : struct io_device *dev;
2350 : int rc;
2351 :
2352 3028 : pthread_mutex_lock(&g_devlist_mutex);
2353 3028 : dev = io_device_get(io_device);
2354 3028 : if (dev == NULL) {
2355 1 : SPDK_ERRLOG("could not find io_device %p\n", io_device);
2356 1 : pthread_mutex_unlock(&g_devlist_mutex);
2357 1 : return NULL;
2358 : }
2359 :
2360 3027 : thread = _get_thread();
2361 3027 : if (!thread) {
2362 0 : SPDK_ERRLOG("No thread allocated\n");
2363 0 : pthread_mutex_unlock(&g_devlist_mutex);
2364 0 : return NULL;
2365 : }
2366 :
2367 3027 : if (spdk_unlikely(thread->state == SPDK_THREAD_STATE_EXITED)) {
2368 0 : SPDK_ERRLOG("Thread %s is marked as exited\n", thread->name);
2369 0 : pthread_mutex_unlock(&g_devlist_mutex);
2370 0 : return NULL;
2371 : }
2372 :
2373 3027 : ch = thread_get_io_channel(thread, dev);
2374 3027 : if (ch != NULL) {
2375 1305 : ch->ref++;
2376 :
2377 1305 : SPDK_DEBUGLOG(thread, "Get io_channel %p for io_device %s (%p) on thread %s refcnt %u\n",
2378 : ch, dev->name, dev->io_device, thread->name, ch->ref);
2379 :
2380 : /*
2381 : * An I/O channel already exists for this device on this
2382 : * thread, so return it.
2383 : */
2384 1305 : pthread_mutex_unlock(&g_devlist_mutex);
2385 1305 : spdk_trace_record(TRACE_THREAD_IOCH_GET, 0, 0,
2386 : (uint64_t)spdk_io_channel_get_ctx(ch), ch->ref);
2387 1305 : return ch;
2388 : }
2389 :
2390 1722 : ch = calloc(1, sizeof(*ch) + dev->ctx_size);
2391 1722 : if (ch == NULL) {
2392 0 : SPDK_ERRLOG("could not calloc spdk_io_channel\n");
2393 0 : pthread_mutex_unlock(&g_devlist_mutex);
2394 0 : return NULL;
2395 : }
2396 :
2397 1722 : ch->dev = dev;
2398 1722 : ch->destroy_cb = dev->destroy_cb;
2399 1722 : ch->thread = thread;
2400 1722 : ch->ref = 1;
2401 1722 : ch->destroy_ref = 0;
2402 1722 : RB_INSERT(io_channel_tree, &thread->io_channels, ch);
2403 :
2404 1722 : SPDK_DEBUGLOG(thread, "Get io_channel %p for io_device %s (%p) on thread %s refcnt %u\n",
2405 : ch, dev->name, dev->io_device, thread->name, ch->ref);
2406 :
2407 1722 : dev->refcnt++;
2408 :
2409 1722 : pthread_mutex_unlock(&g_devlist_mutex);
2410 :
2411 1722 : rc = dev->create_cb(io_device, (uint8_t *)ch + sizeof(*ch));
2412 1722 : if (rc != 0) {
2413 3 : pthread_mutex_lock(&g_devlist_mutex);
2414 3 : RB_REMOVE(io_channel_tree, &ch->thread->io_channels, ch);
2415 3 : dev->refcnt--;
2416 3 : free(ch);
2417 3 : SPDK_ERRLOG("could not create io_channel for io_device %s (%p): %s (rc=%d)\n",
2418 : dev->name, io_device, spdk_strerror(-rc), rc);
2419 3 : pthread_mutex_unlock(&g_devlist_mutex);
2420 3 : return NULL;
2421 : }
2422 :
2423 1719 : spdk_trace_record(TRACE_THREAD_IOCH_GET, 0, 0, (uint64_t)spdk_io_channel_get_ctx(ch), 1);
2424 1719 : return ch;
2425 3028 : }
2426 :
2427 : static void
2428 1721 : put_io_channel(void *arg)
2429 : {
2430 1721 : struct spdk_io_channel *ch = arg;
2431 1721 : bool do_remove_dev = true;
2432 : struct spdk_thread *thread;
2433 :
2434 1721 : thread = spdk_get_thread();
2435 1721 : if (!thread) {
2436 0 : SPDK_ERRLOG("called from non-SPDK thread\n");
2437 0 : assert(false);
2438 : return;
2439 : }
2440 :
2441 1721 : SPDK_DEBUGLOG(thread,
2442 : "Releasing io_channel %p for io_device %s (%p) on thread %s\n",
2443 : ch, ch->dev->name, ch->dev->io_device, thread->name);
2444 :
2445 1721 : assert(ch->thread == thread);
2446 :
2447 1721 : ch->destroy_ref--;
2448 :
2449 1721 : if (ch->ref > 0 || ch->destroy_ref > 0) {
2450 : /*
2451 : * Another reference to the associated io_device was requested
2452 : * after this message was sent but before it had a chance to
2453 : * execute.
2454 : */
2455 4 : return;
2456 : }
2457 :
2458 1717 : pthread_mutex_lock(&g_devlist_mutex);
2459 1717 : RB_REMOVE(io_channel_tree, &ch->thread->io_channels, ch);
2460 1717 : pthread_mutex_unlock(&g_devlist_mutex);
2461 :
2462 : /* Don't hold the devlist mutex while the destroy_cb is called. */
2463 1717 : ch->destroy_cb(ch->dev->io_device, spdk_io_channel_get_ctx(ch));
2464 :
2465 1717 : pthread_mutex_lock(&g_devlist_mutex);
2466 1717 : ch->dev->refcnt--;
2467 :
2468 1717 : if (!ch->dev->unregistered) {
2469 702 : do_remove_dev = false;
2470 702 : }
2471 :
2472 1717 : if (ch->dev->refcnt > 0) {
2473 146 : do_remove_dev = false;
2474 146 : }
2475 :
2476 1717 : pthread_mutex_unlock(&g_devlist_mutex);
2477 :
2478 1717 : if (do_remove_dev) {
2479 1008 : io_device_free(ch->dev);
2480 1008 : }
2481 1717 : free(ch);
2482 1721 : }
2483 :
2484 : void
2485 3023 : spdk_put_io_channel(struct spdk_io_channel *ch)
2486 : {
2487 : struct spdk_thread *thread;
2488 : int rc __attribute__((unused));
2489 :
2490 3023 : spdk_trace_record(TRACE_THREAD_IOCH_PUT, 0, 0,
2491 : (uint64_t)spdk_io_channel_get_ctx(ch), ch->ref);
2492 :
2493 3023 : thread = spdk_get_thread();
2494 3023 : if (!thread) {
2495 0 : SPDK_ERRLOG("called from non-SPDK thread\n");
2496 0 : assert(false);
2497 : return;
2498 : }
2499 :
2500 3023 : if (ch->thread != thread) {
2501 0 : wrong_thread(__func__, "ch", ch->thread, thread);
2502 0 : return;
2503 : }
2504 :
2505 3023 : SPDK_DEBUGLOG(thread,
2506 : "Putting io_channel %p for io_device %s (%p) on thread %s refcnt %u\n",
2507 : ch, ch->dev->name, ch->dev->io_device, thread->name, ch->ref);
2508 :
2509 3023 : ch->ref--;
2510 :
2511 3023 : if (ch->ref == 0) {
2512 1721 : ch->destroy_ref++;
2513 1721 : rc = spdk_thread_send_msg(thread, put_io_channel, ch);
2514 1721 : assert(rc == 0);
2515 1721 : }
2516 3023 : }
2517 :
2518 : struct spdk_io_channel *
2519 2897 : spdk_io_channel_from_ctx(void *ctx)
2520 : {
2521 2897 : return (struct spdk_io_channel *)((uint8_t *)ctx - sizeof(struct spdk_io_channel));
2522 : }
2523 :
2524 : struct spdk_thread *
2525 2324 : spdk_io_channel_get_thread(struct spdk_io_channel *ch)
2526 : {
2527 2324 : return ch->thread;
2528 : }
2529 :
2530 : void *
2531 50 : spdk_io_channel_get_io_device(struct spdk_io_channel *ch)
2532 : {
2533 50 : return ch->dev->io_device;
2534 : }
2535 :
2536 : const char *
2537 0 : spdk_io_channel_get_io_device_name(struct spdk_io_channel *ch)
2538 : {
2539 0 : return spdk_io_device_get_name(ch->dev);
2540 : }
2541 :
2542 : int
2543 0 : spdk_io_channel_get_ref_count(struct spdk_io_channel *ch)
2544 : {
2545 0 : return ch->ref;
2546 : }
2547 :
2548 : struct spdk_io_channel_iter {
2549 : void *io_device;
2550 : struct io_device *dev;
2551 : spdk_channel_msg fn;
2552 : int status;
2553 : void *ctx;
2554 : struct spdk_io_channel *ch;
2555 :
2556 : struct spdk_thread *cur_thread;
2557 :
2558 : struct spdk_thread *orig_thread;
2559 : spdk_channel_for_each_cpl cpl;
2560 : };
2561 :
2562 : void *
2563 763 : spdk_io_channel_iter_get_io_device(struct spdk_io_channel_iter *i)
2564 : {
2565 763 : return i->io_device;
2566 : }
2567 :
2568 : struct spdk_io_channel *
2569 1219 : spdk_io_channel_iter_get_channel(struct spdk_io_channel_iter *i)
2570 : {
2571 1219 : return i->ch;
2572 : }
2573 :
2574 : void *
2575 3063 : spdk_io_channel_iter_get_ctx(struct spdk_io_channel_iter *i)
2576 : {
2577 3063 : return i->ctx;
2578 : }
2579 :
2580 : static void
2581 1853 : _call_completion(void *ctx)
2582 : {
2583 1853 : struct spdk_io_channel_iter *i = ctx;
2584 :
2585 1853 : assert(i->orig_thread->for_each_count > 0);
2586 1853 : i->orig_thread->for_each_count--;
2587 :
2588 1853 : if (i->cpl != NULL) {
2589 1853 : i->cpl(i, i->status);
2590 1853 : }
2591 1853 : free(i);
2592 1853 : }
2593 :
2594 : static void
2595 1915 : _call_channel(void *ctx)
2596 : {
2597 1915 : struct spdk_io_channel_iter *i = ctx;
2598 : struct spdk_io_channel *ch;
2599 :
2600 : /*
2601 : * It is possible that the channel was deleted before this
2602 : * message had a chance to execute. If so, skip calling
2603 : * the fn() on this thread.
2604 : */
2605 1915 : pthread_mutex_lock(&g_devlist_mutex);
2606 1915 : ch = thread_get_io_channel(i->cur_thread, i->dev);
2607 1915 : pthread_mutex_unlock(&g_devlist_mutex);
2608 :
2609 1915 : if (ch) {
2610 1873 : i->fn(i);
2611 1873 : } else {
2612 42 : spdk_for_each_channel_continue(i, 0);
2613 : }
2614 1915 : }
2615 :
2616 : void
2617 1853 : spdk_for_each_channel(void *io_device, spdk_channel_msg fn, void *ctx,
2618 : spdk_channel_for_each_cpl cpl)
2619 : {
2620 : struct spdk_thread *thread;
2621 : struct spdk_io_channel *ch;
2622 : struct spdk_io_channel_iter *i;
2623 : int rc __attribute__((unused));
2624 :
2625 1853 : i = calloc(1, sizeof(*i));
2626 1853 : if (!i) {
2627 0 : SPDK_ERRLOG("Unable to allocate iterator\n");
2628 0 : assert(false);
2629 : return;
2630 : }
2631 :
2632 1853 : i->io_device = io_device;
2633 1853 : i->fn = fn;
2634 1853 : i->ctx = ctx;
2635 1853 : i->cpl = cpl;
2636 1853 : i->orig_thread = _get_thread();
2637 :
2638 1853 : i->orig_thread->for_each_count++;
2639 :
2640 1853 : pthread_mutex_lock(&g_devlist_mutex);
2641 1853 : i->dev = io_device_get(io_device);
2642 1853 : if (i->dev == NULL) {
2643 0 : SPDK_ERRLOG("could not find io_device %p\n", io_device);
2644 0 : assert(false);
2645 : i->status = -ENODEV;
2646 : goto end;
2647 : }
2648 :
2649 : /* Do not allow new for_each operations if we are already waiting to unregister
2650 : * the device for other for_each operations to complete.
2651 : */
2652 1853 : if (i->dev->pending_unregister) {
2653 0 : SPDK_ERRLOG("io_device %p has a pending unregister\n", io_device);
2654 0 : i->status = -ENODEV;
2655 0 : goto end;
2656 : }
2657 :
2658 2150 : TAILQ_FOREACH(thread, &g_threads, tailq) {
2659 2014 : ch = thread_get_io_channel(thread, i->dev);
2660 2014 : if (ch != NULL) {
2661 1717 : ch->dev->for_each_count++;
2662 1717 : i->cur_thread = thread;
2663 1717 : i->ch = ch;
2664 1717 : pthread_mutex_unlock(&g_devlist_mutex);
2665 1717 : rc = spdk_thread_send_msg(thread, _call_channel, i);
2666 1717 : assert(rc == 0);
2667 1717 : return;
2668 : }
2669 433 : }
2670 :
2671 : end:
2672 136 : pthread_mutex_unlock(&g_devlist_mutex);
2673 :
2674 136 : rc = spdk_thread_send_msg(i->orig_thread, _call_completion, i);
2675 136 : assert(rc == 0);
2676 1853 : }
2677 :
2678 : static void
2679 1 : __pending_unregister(void *arg)
2680 : {
2681 1 : struct io_device *dev = arg;
2682 :
2683 1 : assert(dev->pending_unregister);
2684 1 : assert(dev->for_each_count == 0);
2685 1 : spdk_io_device_unregister(dev->io_device, dev->unregister_cb);
2686 1 : }
2687 :
2688 : void
2689 1915 : spdk_for_each_channel_continue(struct spdk_io_channel_iter *i, int status)
2690 : {
2691 : struct spdk_thread *thread;
2692 : struct spdk_io_channel *ch;
2693 : struct io_device *dev;
2694 : int rc __attribute__((unused));
2695 :
2696 1915 : assert(i->cur_thread == spdk_get_thread());
2697 :
2698 1915 : i->status = status;
2699 :
2700 1915 : pthread_mutex_lock(&g_devlist_mutex);
2701 1915 : dev = i->dev;
2702 1915 : if (status) {
2703 11 : goto end;
2704 : }
2705 :
2706 1904 : thread = TAILQ_NEXT(i->cur_thread, tailq);
2707 3674 : while (thread) {
2708 1968 : ch = thread_get_io_channel(thread, dev);
2709 1968 : if (ch != NULL) {
2710 198 : i->cur_thread = thread;
2711 198 : i->ch = ch;
2712 198 : pthread_mutex_unlock(&g_devlist_mutex);
2713 198 : rc = spdk_thread_send_msg(thread, _call_channel, i);
2714 198 : assert(rc == 0);
2715 198 : return;
2716 : }
2717 1770 : thread = TAILQ_NEXT(thread, tailq);
2718 : }
2719 :
2720 : end:
2721 1717 : dev->for_each_count--;
2722 1717 : i->ch = NULL;
2723 1717 : pthread_mutex_unlock(&g_devlist_mutex);
2724 :
2725 1717 : rc = spdk_thread_send_msg(i->orig_thread, _call_completion, i);
2726 1717 : assert(rc == 0);
2727 :
2728 1717 : pthread_mutex_lock(&g_devlist_mutex);
2729 1717 : if (dev->pending_unregister && dev->for_each_count == 0) {
2730 1 : rc = spdk_thread_send_msg(dev->unregister_thread, __pending_unregister, dev);
2731 1 : assert(rc == 0);
2732 1 : }
2733 1717 : pthread_mutex_unlock(&g_devlist_mutex);
2734 1915 : }
2735 :
2736 : static void
2737 0 : thread_interrupt_destroy(struct spdk_thread *thread)
2738 : {
2739 0 : struct spdk_fd_group *fgrp = thread->fgrp;
2740 :
2741 0 : SPDK_INFOLOG(thread, "destroy fgrp for thread (%s)\n", thread->name);
2742 :
2743 0 : if (thread->msg_fd < 0) {
2744 0 : return;
2745 : }
2746 :
2747 0 : spdk_fd_group_remove(fgrp, thread->msg_fd);
2748 0 : close(thread->msg_fd);
2749 0 : thread->msg_fd = -1;
2750 :
2751 0 : spdk_fd_group_destroy(fgrp);
2752 0 : thread->fgrp = NULL;
2753 0 : }
2754 :
2755 : #ifdef __linux__
2756 : static int
2757 : thread_interrupt_msg_process(void *arg)
2758 : {
2759 : struct spdk_thread *thread = arg;
2760 : struct spdk_thread *orig_thread;
2761 : uint32_t msg_count;
2762 : spdk_msg_fn critical_msg;
2763 : int rc = 0;
2764 : uint64_t notify = 1;
2765 :
2766 : assert(spdk_interrupt_mode_is_enabled());
2767 :
2768 : orig_thread = spdk_get_thread();
2769 : spdk_set_thread(thread);
2770 :
2771 : /* There may be race between msg_acknowledge and another producer's msg_notify,
2772 : * so msg_acknowledge should be applied ahead. And then check for self's msg_notify.
2773 : * This can avoid msg notification missing.
2774 : */
2775 : rc = read(thread->msg_fd, ¬ify, sizeof(notify));
2776 : if (rc < 0 && errno != EAGAIN) {
2777 : SPDK_ERRLOG("failed to acknowledge msg event: %s.\n", spdk_strerror(errno));
2778 : }
2779 :
2780 : critical_msg = thread->critical_msg;
2781 : if (spdk_unlikely(critical_msg != NULL)) {
2782 : critical_msg(NULL);
2783 : thread->critical_msg = NULL;
2784 : rc = 1;
2785 : }
2786 :
2787 : msg_count = msg_queue_run_batch(thread, 0);
2788 : if (msg_count) {
2789 : rc = 1;
2790 : }
2791 :
2792 : SPIN_ASSERT(thread->lock_count == 0, SPIN_ERR_HOLD_DURING_SWITCH);
2793 : if (spdk_unlikely(!thread->in_interrupt)) {
2794 : /* The thread transitioned to poll mode in a msg during the above processing.
2795 : * Clear msg_fd since thread messages will be polled directly in poll mode.
2796 : */
2797 : rc = read(thread->msg_fd, ¬ify, sizeof(notify));
2798 : if (rc < 0 && errno != EAGAIN) {
2799 : SPDK_ERRLOG("failed to acknowledge msg queue: %s.\n", spdk_strerror(errno));
2800 : }
2801 : }
2802 :
2803 : spdk_set_thread(orig_thread);
2804 : return rc;
2805 : }
2806 :
2807 : static int
2808 : thread_interrupt_create(struct spdk_thread *thread)
2809 : {
2810 : int rc;
2811 :
2812 : SPDK_INFOLOG(thread, "Create fgrp for thread (%s)\n", thread->name);
2813 :
2814 : rc = spdk_fd_group_create(&thread->fgrp);
2815 : if (rc) {
2816 : return rc;
2817 : }
2818 :
2819 : thread->msg_fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
2820 : if (thread->msg_fd < 0) {
2821 : rc = -errno;
2822 : spdk_fd_group_destroy(thread->fgrp);
2823 : thread->fgrp = NULL;
2824 :
2825 : return rc;
2826 : }
2827 :
2828 : return SPDK_FD_GROUP_ADD(thread->fgrp, thread->msg_fd,
2829 : thread_interrupt_msg_process, thread);
2830 : }
2831 : #else
2832 : static int
2833 0 : thread_interrupt_create(struct spdk_thread *thread)
2834 : {
2835 0 : return -ENOTSUP;
2836 : }
2837 : #endif
2838 :
2839 : static int
2840 0 : _interrupt_wrapper(void *ctx)
2841 : {
2842 0 : struct spdk_interrupt *intr = ctx;
2843 : struct spdk_thread *orig_thread, *thread;
2844 : int rc;
2845 :
2846 0 : orig_thread = spdk_get_thread();
2847 0 : thread = intr->thread;
2848 :
2849 0 : spdk_set_thread(thread);
2850 :
2851 : SPDK_DTRACE_PROBE4(interrupt_fd_process, intr->name, intr->efd,
2852 : intr->fn, intr->arg);
2853 :
2854 0 : rc = intr->fn(intr->arg);
2855 :
2856 0 : SPIN_ASSERT(thread->lock_count == 0, SPIN_ERR_HOLD_DURING_SWITCH);
2857 :
2858 0 : spdk_set_thread(orig_thread);
2859 :
2860 0 : return rc;
2861 : }
2862 :
2863 : struct spdk_interrupt *
2864 0 : spdk_interrupt_register(int efd, spdk_interrupt_fn fn,
2865 : void *arg, const char *name)
2866 : {
2867 0 : return spdk_interrupt_register_for_events(efd, SPDK_INTERRUPT_EVENT_IN, fn, arg, name);
2868 : }
2869 :
2870 : struct spdk_interrupt *
2871 0 : spdk_interrupt_register_for_events(int efd, uint32_t events, spdk_interrupt_fn fn, void *arg,
2872 : const char *name)
2873 : {
2874 0 : struct spdk_event_handler_opts opts = {};
2875 :
2876 0 : spdk_fd_group_get_default_event_handler_opts(&opts, sizeof(opts));
2877 0 : opts.events = events;
2878 0 : opts.fd_type = SPDK_FD_TYPE_DEFAULT;
2879 :
2880 0 : return spdk_interrupt_register_ext(efd, fn, arg, name, &opts);
2881 : }
2882 :
2883 : struct spdk_interrupt *
2884 0 : spdk_interrupt_register_ext(int efd, spdk_interrupt_fn fn, void *arg, const char *name,
2885 : struct spdk_event_handler_opts *opts)
2886 : {
2887 : struct spdk_thread *thread;
2888 : struct spdk_interrupt *intr;
2889 : int ret;
2890 :
2891 0 : thread = spdk_get_thread();
2892 0 : if (!thread) {
2893 0 : assert(false);
2894 : return NULL;
2895 : }
2896 :
2897 0 : if (spdk_unlikely(thread->state != SPDK_THREAD_STATE_RUNNING)) {
2898 0 : SPDK_ERRLOG("thread %s is marked as exited\n", thread->name);
2899 0 : return NULL;
2900 : }
2901 :
2902 0 : intr = calloc(1, sizeof(*intr));
2903 0 : if (intr == NULL) {
2904 0 : SPDK_ERRLOG("Interrupt handler allocation failed\n");
2905 0 : return NULL;
2906 : }
2907 :
2908 0 : if (name) {
2909 0 : snprintf(intr->name, sizeof(intr->name), "%s", name);
2910 0 : } else {
2911 0 : snprintf(intr->name, sizeof(intr->name), "%p", fn);
2912 : }
2913 :
2914 0 : intr->efd = efd;
2915 0 : intr->thread = thread;
2916 0 : intr->fn = fn;
2917 0 : intr->arg = arg;
2918 :
2919 0 : ret = spdk_fd_group_add_ext(thread->fgrp, efd, _interrupt_wrapper, intr, intr->name, opts);
2920 :
2921 0 : if (ret != 0) {
2922 0 : SPDK_ERRLOG("thread %s: failed to add fd %d: %s\n",
2923 : thread->name, efd, spdk_strerror(-ret));
2924 0 : free(intr);
2925 0 : return NULL;
2926 : }
2927 :
2928 0 : return intr;
2929 0 : }
2930 :
2931 : void
2932 0 : spdk_interrupt_unregister(struct spdk_interrupt **pintr)
2933 : {
2934 : struct spdk_thread *thread;
2935 : struct spdk_interrupt *intr;
2936 :
2937 0 : intr = *pintr;
2938 0 : if (intr == NULL) {
2939 0 : return;
2940 : }
2941 :
2942 0 : *pintr = NULL;
2943 :
2944 0 : thread = spdk_get_thread();
2945 0 : if (!thread) {
2946 0 : assert(false);
2947 : return;
2948 : }
2949 :
2950 0 : if (intr->thread != thread) {
2951 0 : wrong_thread(__func__, intr->name, intr->thread, thread);
2952 0 : return;
2953 : }
2954 :
2955 0 : spdk_fd_group_remove(thread->fgrp, intr->efd);
2956 0 : free(intr);
2957 0 : }
2958 :
2959 : int
2960 0 : spdk_interrupt_set_event_types(struct spdk_interrupt *intr,
2961 : enum spdk_interrupt_event_types event_types)
2962 : {
2963 : struct spdk_thread *thread;
2964 :
2965 0 : thread = spdk_get_thread();
2966 0 : if (!thread) {
2967 0 : assert(false);
2968 : return -EINVAL;
2969 : }
2970 :
2971 0 : if (intr->thread != thread) {
2972 0 : wrong_thread(__func__, intr->name, intr->thread, thread);
2973 0 : return -EINVAL;
2974 : }
2975 :
2976 0 : return spdk_fd_group_event_modify(thread->fgrp, intr->efd, event_types);
2977 0 : }
2978 :
2979 : int
2980 0 : spdk_thread_get_interrupt_fd(struct spdk_thread *thread)
2981 : {
2982 0 : return spdk_fd_group_get_fd(thread->fgrp);
2983 : }
2984 :
2985 : struct spdk_fd_group *
2986 0 : spdk_thread_get_interrupt_fd_group(struct spdk_thread *thread)
2987 : {
2988 0 : return thread->fgrp;
2989 : }
2990 :
2991 : static bool g_interrupt_mode = false;
2992 :
2993 : int
2994 0 : spdk_interrupt_mode_enable(void)
2995 : {
2996 : /* It must be called once prior to initializing the threading library.
2997 : * g_spdk_msg_mempool will be valid if thread library is initialized.
2998 : */
2999 0 : if (g_spdk_msg_mempool) {
3000 0 : SPDK_ERRLOG("Failed due to threading library is already initialized.\n");
3001 0 : return -1;
3002 : }
3003 :
3004 : #ifdef __linux__
3005 : SPDK_NOTICELOG("Set SPDK running in interrupt mode.\n");
3006 : g_interrupt_mode = true;
3007 : return 0;
3008 : #else
3009 0 : SPDK_ERRLOG("SPDK interrupt mode supports only Linux platform now.\n");
3010 0 : g_interrupt_mode = false;
3011 0 : return -ENOTSUP;
3012 : #endif
3013 0 : }
3014 :
3015 : bool
3016 104169 : spdk_interrupt_mode_is_enabled(void)
3017 : {
3018 104169 : return g_interrupt_mode;
3019 : }
3020 :
3021 : #define SSPIN_DEBUG_STACK_FRAMES 16
3022 :
3023 : struct sspin_stack {
3024 : void *addrs[SSPIN_DEBUG_STACK_FRAMES];
3025 : uint32_t depth;
3026 : };
3027 :
3028 : struct spdk_spinlock_internal {
3029 : struct sspin_stack init_stack;
3030 : struct sspin_stack lock_stack;
3031 : struct sspin_stack unlock_stack;
3032 : };
3033 :
3034 : static void
3035 1422 : sspin_init_internal(struct spdk_spinlock *sspin)
3036 : {
3037 : #ifdef DEBUG
3038 1422 : sspin->internal = calloc(1, sizeof(*sspin->internal));
3039 : #endif
3040 1422 : }
3041 :
3042 : static void
3043 1412 : sspin_fini_internal(struct spdk_spinlock *sspin)
3044 : {
3045 : #ifdef DEBUG
3046 1412 : free(sspin->internal);
3047 1412 : sspin->internal = NULL;
3048 : #endif
3049 1412 : }
3050 :
3051 : #if defined(DEBUG) && defined(SPDK_HAVE_EXECINFO_H)
3052 : #define SSPIN_GET_STACK(sspin, which) \
3053 : do { \
3054 : if (sspin->internal != NULL) { \
3055 : struct sspin_stack *stack = &sspin->internal->which ## _stack; \
3056 : stack->depth = backtrace(stack->addrs, SPDK_COUNTOF(stack->addrs)); \
3057 : } \
3058 : } while (0)
3059 : #else
3060 : #define SSPIN_GET_STACK(sspin, which) do { } while (0)
3061 : #endif
3062 :
3063 : static void
3064 15 : sspin_stack_print(const char *title, const struct sspin_stack *sspin_stack)
3065 : {
3066 : #ifdef SPDK_HAVE_EXECINFO_H
3067 : char **stack;
3068 : size_t i;
3069 :
3070 : stack = backtrace_symbols(sspin_stack->addrs, sspin_stack->depth);
3071 : if (stack == NULL) {
3072 : SPDK_ERRLOG("Out of memory while allocate stack for %s\n", title);
3073 : return;
3074 : }
3075 : SPDK_ERRLOG(" %s:\n", title);
3076 : for (i = 0; i < sspin_stack->depth; i++) {
3077 : /*
3078 : * This does not print line numbers. In gdb, use something like "list *0x444b6b" or
3079 : * "list *sspin_stack->addrs[0]". Or more conveniently, load the spdk gdb macros
3080 : * and use use "print *sspin" or "print sspin->internal.lock_stack". See
3081 : * gdb_macros.md in the docs directory for details.
3082 : */
3083 : SPDK_ERRLOG(" #%" PRIu64 ": %s\n", i, stack[i]);
3084 : }
3085 : free(stack);
3086 : #endif /* SPDK_HAVE_EXECINFO_H */
3087 15 : }
3088 :
3089 : static void
3090 5 : sspin_stacks_print(const struct spdk_spinlock *sspin)
3091 : {
3092 5 : if (sspin->internal == NULL) {
3093 0 : return;
3094 : }
3095 5 : SPDK_ERRLOG("spinlock %p\n", sspin);
3096 5 : sspin_stack_print("Lock initialized at", &sspin->internal->init_stack);
3097 5 : sspin_stack_print("Last locked at", &sspin->internal->lock_stack);
3098 5 : sspin_stack_print("Last unlocked at", &sspin->internal->unlock_stack);
3099 5 : }
3100 :
3101 : void
3102 1422 : spdk_spin_init(struct spdk_spinlock *sspin)
3103 : {
3104 : int rc;
3105 :
3106 1422 : memset(sspin, 0, sizeof(*sspin));
3107 1422 : rc = pthread_spin_init(&sspin->spinlock, PTHREAD_PROCESS_PRIVATE);
3108 1422 : SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
3109 1422 : sspin_init_internal(sspin);
3110 1422 : SSPIN_GET_STACK(sspin, init);
3111 1422 : sspin->initialized = true;
3112 1422 : }
3113 :
3114 : void
3115 1413 : spdk_spin_destroy(struct spdk_spinlock *sspin)
3116 : {
3117 : int rc;
3118 :
3119 1413 : SPIN_ASSERT_LOG_STACKS(!sspin->destroyed, SPIN_ERR_DESTROYED, sspin);
3120 1413 : SPIN_ASSERT_LOG_STACKS(sspin->initialized, SPIN_ERR_NOT_INITIALIZED, sspin);
3121 1413 : SPIN_ASSERT_LOG_STACKS(sspin->thread == NULL, SPIN_ERR_LOCK_HELD, sspin);
3122 :
3123 1412 : rc = pthread_spin_destroy(&sspin->spinlock);
3124 1412 : SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
3125 :
3126 1412 : sspin_fini_internal(sspin);
3127 1412 : sspin->initialized = false;
3128 1412 : sspin->destroyed = true;
3129 1413 : }
3130 :
3131 : void
3132 32699 : spdk_spin_lock(struct spdk_spinlock *sspin)
3133 : {
3134 32699 : struct spdk_thread *thread = spdk_get_thread();
3135 : int rc;
3136 :
3137 32699 : SPIN_ASSERT_LOG_STACKS(!sspin->destroyed, SPIN_ERR_DESTROYED, sspin);
3138 32699 : SPIN_ASSERT_LOG_STACKS(sspin->initialized, SPIN_ERR_NOT_INITIALIZED, sspin);
3139 32699 : SPIN_ASSERT_LOG_STACKS(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD, sspin);
3140 32698 : SPIN_ASSERT_LOG_STACKS(thread != sspin->thread, SPIN_ERR_DEADLOCK, sspin);
3141 :
3142 32697 : rc = pthread_spin_lock(&sspin->spinlock);
3143 32697 : SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
3144 :
3145 32697 : sspin->thread = thread;
3146 32697 : sspin->thread->lock_count++;
3147 :
3148 32697 : SSPIN_GET_STACK(sspin, lock);
3149 32699 : }
3150 :
3151 : void
3152 32699 : spdk_spin_unlock(struct spdk_spinlock *sspin)
3153 : {
3154 32699 : struct spdk_thread *thread = spdk_get_thread();
3155 : int rc;
3156 :
3157 32699 : SPIN_ASSERT_LOG_STACKS(!sspin->destroyed, SPIN_ERR_DESTROYED, sspin);
3158 32699 : SPIN_ASSERT_LOG_STACKS(sspin->initialized, SPIN_ERR_NOT_INITIALIZED, sspin);
3159 32699 : SPIN_ASSERT_LOG_STACKS(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD, sspin);
3160 32699 : SPIN_ASSERT_LOG_STACKS(thread == sspin->thread, SPIN_ERR_WRONG_THREAD, sspin);
3161 :
3162 32697 : SPIN_ASSERT_LOG_STACKS(thread->lock_count > 0, SPIN_ERR_LOCK_COUNT, sspin);
3163 32697 : thread->lock_count--;
3164 32697 : sspin->thread = NULL;
3165 :
3166 32697 : SSPIN_GET_STACK(sspin, unlock);
3167 :
3168 32697 : rc = pthread_spin_unlock(&sspin->spinlock);
3169 32697 : SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
3170 32699 : }
3171 :
3172 : bool
3173 38576 : spdk_spin_held(struct spdk_spinlock *sspin)
3174 : {
3175 38576 : struct spdk_thread *thread = spdk_get_thread();
3176 :
3177 38576 : SPIN_ASSERT_RETURN(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD, false);
3178 :
3179 38575 : return sspin->thread == thread;
3180 38576 : }
3181 :
3182 : void
3183 0 : spdk_thread_register_post_poller_handler(spdk_post_poller_fn fn, void *fn_arg)
3184 : {
3185 : struct spdk_thread *thr;
3186 :
3187 0 : thr = _get_thread();
3188 0 : assert(thr);
3189 0 : if (spdk_unlikely(thr->num_pp_handlers == SPDK_THREAD_MAX_POST_POLLER_HANDLERS)) {
3190 0 : SPDK_ERRLOG("Too many handlers registered");
3191 0 : return;
3192 : }
3193 :
3194 0 : thr->pp_handlers[thr->num_pp_handlers].fn = fn;
3195 0 : thr->pp_handlers[thr->num_pp_handlers].fn_arg = fn_arg;
3196 0 : thr->num_pp_handlers++;
3197 0 : }
3198 :
3199 34 : SPDK_LOG_REGISTER_COMPONENT(thread)
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