#include <string.h>
#include <errno.h>
#include <urcu/list.h>
+#include <urcu/hlist.h>
#include <lttng/ust-events.h>
#include <assert.h>
#include <helper.h>
+#include <ctype.h>
#include "ltt-tracer-core.h"
+#include "jhash.h"
+#include "error.h"
/*
* probe list is protected by ust_lock()/ust_unlock().
*/
static CDS_LIST_HEAD(probe_list);
+/*
+ * Loglevel hash table, containing the active loglevels.
+ * Protected by ust lock.
+ */
+#define LOGLEVEL_HASH_BITS 6
+#define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS)
+static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE];
+
+/*
+ * Wildcard list, containing the active wildcards.
+ * Protected by ust lock.
+ */
+static CDS_LIST_HEAD(wildcard_list);
+
static
const struct lttng_probe_desc *find_provider(const char *provider)
{
struct tp_list_entry, head);
return &entry->tp;
}
+
+/*
+ * Get loglevel if the loglevel is present in the loglevel hash table.
+ * Must be called with ust lock held.
+ * Returns NULL if not present.
+ */
+struct loglevel_entry *get_loglevel(const char *name)
+{
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+ struct loglevel_entry *e;
+ uint32_t hash = jhash(name, strlen(name), 0);
+
+ head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
+ cds_hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name))
+ return e;
+ }
+ return NULL;
+}
+
+struct loglevel_entry *get_loglevel_value(int64_t value)
+{
+ char name[LTTNG_UST_SYM_NAME_LEN];
+ int ret;
+
+ ret = snprintf(name, LTTNG_UST_SYM_NAME_LEN, "%lld", (long long) value);
+ if (ret < 0)
+ return NULL;
+ return get_loglevel(name);
+}
+
+/*
+ * marshall all probes/all events and create those that fit the
+ * loglevel. Add them to the events list as created.
+ */
+static
+void _probes_create_loglevel_events(struct loglevel_entry *entry,
+ struct session_loglevel *loglevel)
+{
+ struct lttng_probe_desc *probe_desc;
+ struct lttng_ust_event event_param;
+ int i;
+
+ cds_list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ const struct tracepoint_loglevel_entry *ev_ll;
+ const struct lttng_event_desc *event_desc;
+ int match = 0;
+
+ event_desc = probe_desc->event_desc[i];
+ if (!(event_desc->loglevel))
+ continue;
+ ev_ll = *event_desc->loglevel;
+ if (isdigit(entry->name[0])) {
+ if (atoll(entry->name) == ev_ll->value) {
+ match = 1;
+ }
+ } else if (!strcmp(ev_ll->identifier, entry->name)) {
+ match = 1;
+ }
+
+ if (match) {
+ struct ltt_event *ev;
+ int ret;
+
+ memcpy(&event_param, &loglevel->event_param,
+ sizeof(event_param));
+ memcpy(event_param.name,
+ event_desc->name,
+ sizeof(event_param.name));
+ /* create event */
+ ret = ltt_event_create(loglevel->chan,
+ &event_param, NULL,
+ &ev);
+ if (ret) {
+ DBG("Error creating event");
+ continue;
+ }
+ cds_list_add(&ev->loglevel_list,
+ &loglevel->events);
+ }
+ }
+ }
+}
+
+/*
+ * Add the loglevel to the loglevel hash table. Must be called with
+ * ust lock held.
+ */
+struct session_loglevel *add_loglevel(const char *name,
+ struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
+{
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+ struct loglevel_entry *e;
+ struct session_loglevel *sl;
+ size_t name_len = strlen(name) + 1;
+ uint32_t hash = jhash(name, name_len-1, 0);
+ int found = 0;
+
+ /* loglevel entry */
+ head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
+ cds_hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ /*
+ * Using zmalloc here to allocate a variable length element. Could
+ * cause some memory fragmentation if overused.
+ */
+ e = zmalloc(sizeof(struct loglevel_entry) + name_len);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], name, name_len);
+ cds_hlist_add_head(&e->hlist, head);
+ CDS_INIT_LIST_HEAD(&e->session_list);
+ }
+
+ /* session loglevel */
+ cds_list_for_each_entry(sl, &e->session_list, session_list) {
+ if (chan == sl->chan) {
+ DBG("loglevel %s busy for this channel", name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ sl = zmalloc(sizeof(struct session_loglevel));
+ if (!sl)
+ return ERR_PTR(-ENOMEM);
+ sl->chan = chan;
+ sl->enabled = 1;
+ memcpy(&sl->event_param, event_param, sizeof(sl->event_param));
+ sl->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
+ CDS_INIT_LIST_HEAD(&sl->events);
+ cds_list_add(&sl->list, &chan->session->loglevels);
+ cds_list_add(&sl->session_list, &e->session_list);
+ sl->entry = e;
+ _probes_create_loglevel_events(e, sl);
+ return sl;
+}
+
+/*
+ * Remove the loglevel from the loglevel hash table. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+void _remove_loglevel(struct session_loglevel *loglevel)
+{
+ struct ltt_event *ev, *tmp;
+
+ /*
+ * Just remove the events owned (for enable/disable) by this
+ * loglevel from the list. The session teardown will take care
+ * of freeing the event memory.
+ */
+ cds_list_for_each_entry_safe(ev, tmp, &loglevel->events, list) {
+ cds_list_del(&ev->list);
+ }
+ cds_list_del(&loglevel->session_list);
+ cds_list_del(&loglevel->list);
+ if (cds_list_empty(&loglevel->entry->session_list)) {
+ cds_hlist_del(&loglevel->entry->hlist);
+ free(loglevel->entry);
+ }
+ free(loglevel);
+}
+
+int ltt_loglevel_enable(struct session_loglevel *loglevel)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (loglevel->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &loglevel->events, list) {
+ ret = ltt_event_enable(ev);
+ if (ret) {
+ DBG("Error: enable error.\n");
+ return ret;
+ }
+ }
+ loglevel->enabled = 1;
+ return 0;
+}
+
+int ltt_loglevel_disable(struct session_loglevel *loglevel)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (!loglevel->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &loglevel->events, list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ loglevel->enabled = 0;
+ return 0;
+}
+
+/* WILDCARDS */
+
+/*
+ * Return wildcard for a given event name if the event name match the
+ * one of the wildcards.
+ * Must be called with ust lock held.
+ * Returns NULL if not present.
+ */
+struct wildcard_entry *match_wildcard(const char *name)
+{
+ struct wildcard_entry *e;
+
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ /* If only contain '*' */
+ if (strlen(e->name) == 1)
+ return e;
+ /* Compare excluding final '*' */
+ if (!strncmp(name, e->name, strlen(e->name) - 1))
+ return e;
+ }
+ return NULL;
+}
+
+/*
+ * marshall all probes/all events and create those that fit the
+ * wildcard. Add them to the events list as created.
+ */
+static
+void _probes_create_wildcard_events(struct wildcard_entry *entry,
+ struct session_wildcard *wildcard)
+{
+ struct lttng_probe_desc *probe_desc;
+ struct lttng_ust_event event_param;
+ int i;
+
+ cds_list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ int match = 0;
+
+ event_desc = probe_desc->event_desc[i];
+ /* compare excluding final '*' */
+ assert(strlen(entry->name) > 0);
+ if (strcmp(event_desc->name, "lttng_ust:metadata")
+ && (strlen(entry->name) == 1
+ || !strncmp(event_desc->name, entry->name,
+ strlen(entry->name) - 1))) {
+ match = 1;
+ }
+ if (match) {
+ struct ltt_event *ev;
+ int ret;
+
+ memcpy(&event_param, &wildcard->event_param,
+ sizeof(event_param));
+ memcpy(event_param.name,
+ event_desc->name,
+ sizeof(event_param.name));
+ /* create event */
+ ret = ltt_event_create(wildcard->chan,
+ &event_param, NULL,
+ &ev);
+ if (ret) {
+ DBG("Error creating event");
+ continue;
+ }
+ cds_list_add(&ev->wildcard_list,
+ &wildcard->events);
+ }
+ }
+ }
+}
+
+/*
+ * Add the wildcard to the wildcard hash table. Must be called with
+ * ust lock held.
+ */
+struct session_wildcard *add_wildcard(const char *name,
+ struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
+{
+ struct wildcard_entry *e;
+ struct session_wildcard *sw;
+ size_t name_len = strlen(name) + 1;
+ int found = 0;
+
+ /* wildcard entry */
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ if (!strcmp(name, e->name)) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ /*
+ * Using zmalloc here to allocate a variable length element. Could
+ * cause some memory fragmentation if overused.
+ */
+ e = zmalloc(sizeof(struct wildcard_entry) + name_len);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], name, name_len);
+ cds_list_add(&e->list, &wildcard_list);
+ CDS_INIT_LIST_HEAD(&e->session_list);
+ }
+
+ /* session wildcard */
+ cds_list_for_each_entry(sw, &e->session_list, session_list) {
+ if (chan == sw->chan) {
+ DBG("wildcard %s busy for this channel", name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ sw = zmalloc(sizeof(struct session_wildcard));
+ if (!sw)
+ return ERR_PTR(-ENOMEM);
+ sw->chan = chan;
+ sw->enabled = 1;
+ memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
+ sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
+ CDS_INIT_LIST_HEAD(&sw->events);
+ cds_list_add(&sw->list, &chan->session->wildcards);
+ cds_list_add(&sw->session_list, &e->session_list);
+ sw->entry = e;
+ _probes_create_wildcard_events(e, sw);
+ return sw;
+}
+
+/*
+ * Remove the wildcard from the wildcard hash table. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+void _remove_wildcard(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev, *tmp;
+
+ /*
+ * Just remove the events owned (for enable/disable) by this
+ * wildcard from the list. The session teardown will take care
+ * of freeing the event memory.
+ */
+ cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, list) {
+ cds_list_del(&ev->list);
+ }
+ cds_list_del(&wildcard->session_list);
+ cds_list_del(&wildcard->list);
+ if (cds_list_empty(&wildcard->entry->session_list)) {
+ cds_list_del(&wildcard->entry->list);
+ free(wildcard->entry);
+ }
+ free(wildcard);
+}
+
+int ltt_wildcard_enable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, list) {
+ ret = ltt_event_enable(ev);
+ if (ret) {
+ DBG("Error: enable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 1;
+ return 0;
+}
+
+int ltt_wildcard_disable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (!wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 0;
+ return 0;
+}
projects / lttng-ust.git / blobdiff