1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright (C) 2018 Intel Corporation. 3 * All rights reserved. 4 */ 5 6 #include <sys/queue.h> 7 8 #include "spdk/stdinc.h" 9 #include "spdk/util.h" 10 #include "spdk/queue.h" 11 #include "spdk/string.h" 12 #include "spdk/log.h" 13 14 #include "spdk/notify.h" 15 16 #define SPDK_NOTIFY_MAX_EVENTS 1024 17 18 struct spdk_notify_type { 19 char name[SPDK_NOTIFY_MAX_NAME_SIZE]; 20 TAILQ_ENTRY(spdk_notify_type) tailq; 21 }; 22 23 static pthread_mutex_t g_events_lock = PTHREAD_MUTEX_INITIALIZER; 24 static struct spdk_notify_event g_events[SPDK_NOTIFY_MAX_EVENTS]; 25 static uint64_t g_events_head; 26 27 static TAILQ_HEAD(, spdk_notify_type) g_notify_types = TAILQ_HEAD_INITIALIZER(g_notify_types); 28 29 struct spdk_notify_type * 30 spdk_notify_type_register(const char *type) 31 { 32 struct spdk_notify_type *it = NULL; 33 34 if (!type) { 35 SPDK_ERRLOG("Invalid notification type %p\n", type); 36 return NULL; 37 } else if (!type[0] || strlen(type) >= SPDK_NOTIFY_MAX_NAME_SIZE) { 38 SPDK_ERRLOG("Notification type '%s' too short or too long\n", type); 39 return NULL; 40 } 41 42 pthread_mutex_lock(&g_events_lock); 43 TAILQ_FOREACH(it, &g_notify_types, tailq) { 44 if (strcmp(type, it->name) == 0) { 45 SPDK_NOTICELOG("Notification type '%s' already registered.\n", type); 46 goto out; 47 } 48 } 49 50 it = calloc(1, sizeof(*it)); 51 if (it == NULL) { 52 goto out; 53 } 54 55 snprintf(it->name, sizeof(it->name), "%s", type); 56 TAILQ_INSERT_TAIL(&g_notify_types, it, tailq); 57 58 out: 59 pthread_mutex_unlock(&g_events_lock); 60 return it; 61 } 62 63 const char * 64 spdk_notify_type_get_name(const struct spdk_notify_type *type) 65 { 66 return type->name; 67 } 68 69 70 void 71 spdk_notify_foreach_type(spdk_notify_foreach_type_cb cb, void *ctx) 72 { 73 struct spdk_notify_type *it; 74 75 pthread_mutex_lock(&g_events_lock); 76 TAILQ_FOREACH(it, &g_notify_types, tailq) { 77 if (cb(it, ctx)) { 78 break; 79 } 80 } 81 pthread_mutex_unlock(&g_events_lock); 82 } 83 84 uint64_t 85 spdk_notify_send(const char *type, const char *ctx) 86 { 87 uint64_t head; 88 struct spdk_notify_event *ev; 89 90 pthread_mutex_lock(&g_events_lock); 91 head = g_events_head; 92 g_events_head++; 93 94 ev = &g_events[head % SPDK_NOTIFY_MAX_EVENTS]; 95 spdk_strcpy_pad(ev->type, type, sizeof(ev->type), '\0'); 96 spdk_strcpy_pad(ev->ctx, ctx, sizeof(ev->ctx), '\0'); 97 pthread_mutex_unlock(&g_events_lock); 98 99 return head; 100 } 101 102 uint64_t 103 spdk_notify_foreach_event(uint64_t start_idx, uint64_t max, 104 spdk_notify_foreach_event_cb cb_fn, void *ctx) 105 { 106 uint64_t i; 107 108 pthread_mutex_lock(&g_events_lock); 109 110 if (g_events_head > SPDK_NOTIFY_MAX_EVENTS && start_idx < g_events_head - SPDK_NOTIFY_MAX_EVENTS) { 111 start_idx = g_events_head - SPDK_NOTIFY_MAX_EVENTS; 112 } 113 114 for (i = 0; start_idx < g_events_head && i < max; start_idx++, i++) { 115 if (cb_fn(start_idx, &g_events[start_idx % SPDK_NOTIFY_MAX_EVENTS], ctx)) { 116 break; 117 } 118 } 119 pthread_mutex_unlock(&g_events_lock); 120 121 return i; 122 } 123