2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <common/common.h>
22 #include <common/hashtable/utils.h>
24 #include "buffer-registry.h"
26 #include "ust-consumer.h"
31 * Set in main.c during initialization process of the daemon. This contains
32 * buffer_reg_uid object which are global registry for per UID buffer. Object
33 * are indexed by session id and matched by the triplet
34 * <session_id/bits_per_long/uid>.
36 static struct lttng_ht
*buffer_registry_uid
;
39 * Initialized at the daemon start. This contains buffer_reg_pid object and
40 * indexed by session id.
42 static struct lttng_ht
*buffer_registry_pid
;
45 * Match function for the per UID registry hash table. It matches a registry
46 * uid object with the triplet <session_id/abi/uid>.
48 static int ht_match_reg_uid(struct cds_lfht_node
*node
, const void *_key
)
50 struct buffer_reg_uid
*reg
;
51 const struct buffer_reg_uid
*key
;
56 reg
= caa_container_of(node
, struct buffer_reg_uid
, node
.node
);
60 if (key
->session_id
!= reg
->session_id
||
61 key
->bits_per_long
!= reg
->bits_per_long
||
62 key
->uid
!= reg
->uid
) {
73 * Hash function for the per UID registry hash table. This XOR the triplet
76 static unsigned long ht_hash_reg_uid(void *_key
, unsigned long seed
)
79 struct buffer_reg_uid
*key
= _key
;
83 xored_key
= (uint64_t)(key
->session_id
^ key
->bits_per_long
^ key
->uid
);
84 return hash_key_u64(&xored_key
, seed
);
88 * Initialize global buffer per UID registry. Should only be called ONCE!.
90 void buffer_reg_init_uid_registry(void)
92 /* Should be called once. */
93 assert(!buffer_registry_uid
);
94 buffer_registry_uid
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
95 assert(buffer_registry_uid
);
96 buffer_registry_uid
->match_fct
= ht_match_reg_uid
;
97 buffer_registry_uid
->hash_fct
= ht_hash_reg_uid
;
99 DBG3("Global buffer per UID registry initialized");
103 * Allocate and initialize object. Set regp with the object pointer.
105 * Return 0 on success else a negative value and regp is untouched.
107 int buffer_reg_uid_create(int session_id
, uint32_t bits_per_long
, uid_t uid
,
108 enum lttng_domain_type domain
, struct buffer_reg_uid
**regp
)
111 struct buffer_reg_uid
*reg
= NULL
;
115 reg
= zmalloc(sizeof(*reg
));
117 PERROR("zmalloc buffer registry uid");
122 reg
->registry
= zmalloc(sizeof(struct buffer_reg_session
));
123 if (!reg
->registry
) {
124 PERROR("zmalloc buffer registry uid session");
129 reg
->session_id
= session_id
;
130 reg
->bits_per_long
= bits_per_long
;
132 reg
->domain
= domain
;
134 reg
->registry
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
135 if (!reg
->registry
->channels
) {
140 cds_lfht_node_init(®
->node
.node
);
143 DBG3("Buffer registry per UID created id: %d, ABI: %u, uid: %d, domain: %d",
144 session_id
, bits_per_long
, uid
, domain
);
156 * Add a buffer registry per UID object to the global registry.
158 void buffer_reg_uid_add(struct buffer_reg_uid
*reg
)
160 struct cds_lfht_node
*nodep
;
161 struct lttng_ht
*ht
= buffer_registry_uid
;
165 DBG3("Buffer registry per UID adding to global registry with id: %d",
169 nodep
= cds_lfht_add_unique(ht
->ht
, ht
->hash_fct(reg
, lttng_ht_seed
),
170 ht
->match_fct
, reg
, ®
->node
.node
);
171 assert(nodep
== ®
->node
.node
);
176 * Find a buffer registry per UID object with given params. RCU read side lock
177 * MUST be acquired before calling this and hold on to protect the object.
179 * Return the object pointer or NULL on error.
181 struct buffer_reg_uid
*buffer_reg_uid_find(int session_id
,
182 uint32_t bits_per_long
, uid_t uid
)
184 struct lttng_ht_node_u64
*node
;
185 struct lttng_ht_iter iter
;
186 struct buffer_reg_uid
*reg
= NULL
, key
;
187 struct lttng_ht
*ht
= buffer_registry_uid
;
189 /* Setup key we are looking for. */
190 key
.session_id
= session_id
;
191 key
.bits_per_long
= bits_per_long
;
194 DBG3("Buffer registry per UID find id: %d, ABI: %u, uid: %d",
195 session_id
, bits_per_long
, uid
);
197 /* Custom lookup function since it's a different key. */
198 cds_lfht_lookup(ht
->ht
, ht
->hash_fct(&key
, lttng_ht_seed
), ht
->match_fct
,
200 node
= lttng_ht_iter_get_node_u64(&iter
);
204 reg
= caa_container_of(node
, struct buffer_reg_uid
, node
);
211 * Initialize global buffer per PID registry. Should only be called ONCE!.
213 void buffer_reg_init_pid_registry(void)
215 /* Should be called once. */
216 assert(!buffer_registry_pid
);
217 buffer_registry_pid
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
218 assert(buffer_registry_pid
);
220 DBG3("Global buffer per PID registry initialized");
224 * Allocate and initialize object. Set regp with the object pointer.
226 * Return 0 on success else a negative value and regp is untouched.
228 int buffer_reg_pid_create(int session_id
, struct buffer_reg_pid
**regp
)
231 struct buffer_reg_pid
*reg
= NULL
;
235 reg
= zmalloc(sizeof(*reg
));
237 PERROR("zmalloc buffer registry pid");
242 reg
->registry
= zmalloc(sizeof(struct buffer_reg_session
));
243 if (!reg
->registry
) {
244 PERROR("zmalloc buffer registry pid session");
249 /* A cast is done here so we can use the session ID as a u64 ht node. */
250 reg
->session_id
= session_id
;
252 reg
->registry
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
253 if (!reg
->registry
->channels
) {
258 lttng_ht_node_init_ulong(®
->node
, reg
->session_id
);
261 DBG3("Buffer registry per PID created with session id: %d", session_id
);
273 * Add a buffer registry per PID object to the global registry.
275 void buffer_reg_pid_add(struct buffer_reg_pid
*reg
)
279 DBG3("Buffer registry per PID adding to global registry with id: %d",
283 lttng_ht_add_unique_ulong(buffer_registry_pid
, ®
->node
);
288 * Find a buffer registry per PID object with given params. RCU read side lock
289 * MUST be acquired before calling this and hold on to protect the object.
291 * Return the object pointer or NULL on error.
293 struct buffer_reg_pid
*buffer_reg_pid_find(int session_id
)
295 struct lttng_ht_node_ulong
*node
;
296 struct lttng_ht_iter iter
;
297 struct buffer_reg_pid
*reg
= NULL
;
298 struct lttng_ht
*ht
= buffer_registry_pid
;
300 DBG3("Buffer registry per PID find id: %d", session_id
);
302 lttng_ht_lookup(ht
, (void *)((unsigned long) session_id
), &iter
);
303 node
= lttng_ht_iter_get_node_ulong(&iter
);
307 reg
= caa_container_of(node
, struct buffer_reg_pid
, node
);
314 * Allocate and initialize a buffer registry channel with the given key. Set
315 * regp with the object pointer.
317 * Return 0 on success or else a negative value keeping regp untouched.
319 int buffer_reg_channel_create(uint64_t key
, struct buffer_reg_channel
**regp
)
321 struct buffer_reg_channel
*reg
;
325 DBG3("Buffer registry channel create with key: %" PRIu64
, key
);
327 reg
= zmalloc(sizeof(*reg
));
329 PERROR("zmalloc buffer registry channel");
334 CDS_INIT_LIST_HEAD(®
->streams
);
335 pthread_mutex_init(®
->stream_list_lock
, NULL
);
337 lttng_ht_node_init_u64(®
->node
, key
);
344 * Allocate and initialize a buffer registry stream. Set regp with the object
347 * Return 0 on success or else a negative value keeping regp untouched.
349 int buffer_reg_stream_create(struct buffer_reg_stream
**regp
)
351 struct buffer_reg_stream
*reg
;
355 DBG3("Buffer registry creating stream");
357 reg
= zmalloc(sizeof(*reg
));
359 PERROR("zmalloc buffer registry stream");
369 * Add stream to the list in the channel.
371 void buffer_reg_stream_add(struct buffer_reg_stream
*stream
,
372 struct buffer_reg_channel
*channel
)
377 pthread_mutex_lock(&channel
->stream_list_lock
);
378 cds_list_add_tail(&stream
->lnode
, &channel
->streams
);
379 pthread_mutex_unlock(&channel
->stream_list_lock
);
383 * Add a buffer registry channel object to the given session.
385 void buffer_reg_channel_add(struct buffer_reg_session
*session
,
386 struct buffer_reg_channel
*channel
)
392 lttng_ht_add_unique_u64(session
->channels
, &channel
->node
);
397 * Find a buffer registry channel object with the given key. RCU read side lock
398 * MUST be acquired and hold on until the object reference is not needed
401 * Return the object pointer or NULL on error.
403 struct buffer_reg_channel
*buffer_reg_channel_find(uint64_t key
,
404 struct buffer_reg_uid
*reg
)
406 struct lttng_ht_node_u64
*node
;
407 struct lttng_ht_iter iter
;
408 struct buffer_reg_channel
*chan
= NULL
;
413 switch (reg
->domain
) {
414 case LTTNG_DOMAIN_UST
:
415 ht
= reg
->registry
->channels
;
422 lttng_ht_lookup(ht
, &key
, &iter
);
423 node
= lttng_ht_iter_get_node_u64(&iter
);
427 chan
= caa_container_of(node
, struct buffer_reg_channel
, node
);
434 * Destroy a buffer registry stream with the given domain.
436 void buffer_reg_stream_destroy(struct buffer_reg_stream
*regp
,
437 enum lttng_domain_type domain
)
443 DBG3("Buffer registry stream destroy with handle %d",
444 regp
->obj
.ust
->handle
);
447 case LTTNG_DOMAIN_UST
:
451 ret
= ust_ctl_release_object(-1, regp
->obj
.ust
);
452 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
453 ERR("Buffer reg stream release obj handle %d failed with ret %d",
454 regp
->obj
.ust
->handle
, ret
);
457 lttng_fd_put(LTTNG_FD_APPS
, 2);
469 * Remove buffer registry channel object from the session hash table. RCU read
470 * side lock MUST be acquired before calling this.
472 void buffer_reg_channel_remove(struct buffer_reg_session
*session
,
473 struct buffer_reg_channel
*regp
)
476 struct lttng_ht_iter iter
;
481 iter
.iter
.node
= ®p
->node
.node
;
482 ret
= lttng_ht_del(session
->channels
, &iter
);
487 * Destroy a buffer registry channel with the given domain.
489 void buffer_reg_channel_destroy(struct buffer_reg_channel
*regp
,
490 enum lttng_domain_type domain
)
496 DBG3("Buffer registry channel destroy with key %" PRIu32
, regp
->key
);
499 case LTTNG_DOMAIN_UST
:
502 struct buffer_reg_stream
*sreg
, *stmp
;
504 cds_list_for_each_entry_safe(sreg
, stmp
, ®p
->streams
, lnode
) {
505 cds_list_del(&sreg
->lnode
);
506 buffer_reg_stream_destroy(sreg
, domain
);
510 ret
= ust_ctl_release_object(-1, regp
->obj
.ust
);
511 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
512 ERR("Buffer reg channel release obj handle %d failed with ret %d",
513 regp
->obj
.ust
->handle
, ret
);
517 lttng_fd_put(LTTNG_FD_APPS
, 1);
529 * Destroy a buffer registry session with the given domain.
531 * Should *NOT* be called with RCU read-side lock held.
533 static void buffer_reg_session_destroy(struct buffer_reg_session
*regp
,
534 enum lttng_domain_type domain
)
537 struct lttng_ht_iter iter
;
538 struct buffer_reg_channel
*reg_chan
;
540 DBG3("Buffer registry session destroy");
542 /* Destroy all channels. */
544 cds_lfht_for_each_entry(regp
->channels
->ht
, &iter
.iter
, reg_chan
,
546 ret
= lttng_ht_del(regp
->channels
, &iter
);
548 buffer_reg_channel_destroy(reg_chan
, domain
);
552 ht_cleanup_push(regp
->channels
);
555 case LTTNG_DOMAIN_UST
:
556 ust_registry_session_destroy(regp
->reg
.ust
);
568 * Remove buffer registry UID object from the global hash table.
570 void buffer_reg_uid_remove(struct buffer_reg_uid
*regp
)
573 struct lttng_ht_iter iter
;
578 iter
.iter
.node
= ®p
->node
.node
;
579 ret
= lttng_ht_del(buffer_registry_uid
, &iter
);
584 static void rcu_free_buffer_reg_uid(struct rcu_head
*head
)
586 struct lttng_ht_node_u64
*node
=
587 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
588 struct buffer_reg_uid
*reg
=
589 caa_container_of(node
, struct buffer_reg_uid
, node
);
591 buffer_reg_session_destroy(reg
->registry
, reg
->domain
);
595 static void rcu_free_buffer_reg_pid(struct rcu_head
*head
)
597 struct lttng_ht_node_ulong
*node
=
598 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
599 struct buffer_reg_pid
*reg
=
600 caa_container_of(node
, struct buffer_reg_pid
, node
);
602 buffer_reg_session_destroy(reg
->registry
, LTTNG_DOMAIN_UST
);
607 * Destroy buffer registry per UID. The given pointer is NOT removed from any
608 * list or hash table. Use buffer_reg_pid_remove() before calling this function
609 * for the case that the object is in the global hash table.
611 void buffer_reg_uid_destroy(struct buffer_reg_uid
*regp
,
612 struct consumer_output
*consumer
)
614 struct consumer_socket
*socket
;
620 DBG3("Buffer registry per UID destroy with id: %d, ABI: %u, uid: %d",
621 regp
->session_id
, regp
->bits_per_long
, regp
->uid
);
628 /* Get the right socket from the consumer object. */
629 socket
= consumer_find_socket_by_bitness(regp
->bits_per_long
,
635 switch (regp
->domain
) {
636 case LTTNG_DOMAIN_UST
:
637 if (regp
->registry
->reg
.ust
->metadata_key
) {
638 /* Return value does not matter. This call will print errors. */
639 (void) consumer_close_metadata(socket
,
640 regp
->registry
->reg
.ust
->metadata_key
);
652 call_rcu(®p
->node
.head
, rcu_free_buffer_reg_uid
);
656 * Remove buffer registry UID object from the global hash table. RCU read side
657 * lock MUST be acquired before calling this.
659 void buffer_reg_pid_remove(struct buffer_reg_pid
*regp
)
662 struct lttng_ht_iter iter
;
666 iter
.iter
.node
= ®p
->node
.node
;
667 ret
= lttng_ht_del(buffer_registry_pid
, &iter
);
672 * Destroy buffer registry per PID. The pointer is NOT removed from the global
673 * hash table. Call buffer_reg_pid_remove() before that if the object was
674 * previously added to the global hash table.
676 void buffer_reg_pid_destroy(struct buffer_reg_pid
*regp
)
682 DBG3("Buffer registry per PID destroy with id: %d", regp
->session_id
);
684 /* This registry is only used by UST. */
685 call_rcu(®p
->node
.head
, rcu_free_buffer_reg_pid
);
689 * Destroy per PID and UID registry hash table.
691 * Should *NOT* be called with RCU read-side lock held.
693 void buffer_reg_destroy_registries(void)
695 DBG3("Buffer registry destroy all registry");
696 ht_cleanup_push(buffer_registry_uid
);
697 ht_cleanup_push(buffer_registry_pid
);
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