X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Ftrace-kernel.c;h=a453fd8b705537ba8908e729517c20b408ef2951;hp=044fc98d2510ddd17c1bb36353e99f9780b8d933;hb=7c1f6da21f4d46d9c834820a2b26f0634c7365a9;hpb=d42266a417afa6e8ca6024590b8282002aebca07 diff --git a/src/bin/lttng-sessiond/trace-kernel.c b/src/bin/lttng-sessiond/trace-kernel.c index 044fc98d2..a453fd8b7 100644 --- a/src/bin/lttng-sessiond/trace-kernel.c +++ b/src/bin/lttng-sessiond/trace-kernel.c @@ -13,9 +13,18 @@ #include #include +#include #include #include - +#include +#include +#include +#include +#include +#include +#include +#include +#include #include #include #include @@ -62,7 +71,7 @@ struct ltt_kernel_channel *trace_kernel_get_channel_by_name( struct ltt_kernel_event *trace_kernel_find_event( char *name, struct ltt_kernel_channel *channel, enum lttng_event_type type, - struct lttng_filter_bytecode *filter) + struct lttng_bytecode *filter) { struct ltt_kernel_event *ev; int found = 0; @@ -321,7 +330,7 @@ error: */ enum lttng_error_code trace_kernel_create_event( struct lttng_event *ev, char *filter_expression, - struct lttng_filter_bytecode *filter, + struct lttng_bytecode *filter, struct ltt_kernel_event **kernel_event) { enum lttng_error_code ret; @@ -369,9 +378,6 @@ enum lttng_error_code trace_kernel_create_event( */ attr->instrumentation = LTTNG_KERNEL_UPROBE; - /* - * Only the elf lookup method is supported at the moment. - */ lookup = lttng_userspace_probe_location_get_lookup_method( location); if (!lookup) { @@ -391,16 +397,10 @@ enum lttng_error_code trace_kernel_create_event( /* * Save a reference to the probe location used during - * the listing of events. Close its FD since it won't - * be needed for listing. + * the listing of events. */ userspace_probe_location = lttng_userspace_probe_location_copy(location); - ret = lttng_userspace_probe_location_function_set_binary_fd( - userspace_probe_location, -1); - if (ret) { - goto error; - } break; case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: /* Get the file descriptor on the target binary. */ @@ -409,15 +409,10 @@ enum lttng_error_code trace_kernel_create_event( /* * Save a reference to the probe location used during the listing of - * events. Close its FD since it won't be needed for listing. + * events. */ userspace_probe_location = lttng_userspace_probe_location_copy(location); - ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( - userspace_probe_location, -1); - if (ret) { - goto error; - } break; default: DBG("Unsupported lookup method type"); @@ -445,6 +440,9 @@ enum lttng_error_code trace_kernel_create_event( break; case LTTNG_EVENT_SYSCALL: attr->instrumentation = LTTNG_KERNEL_SYSCALL; + attr->u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_ALL; + attr->u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRYEXIT; + attr->u.syscall.match = LTTNG_KERNEL_SYSCALL_MATCH_NAME; break; case LTTNG_EVENT_ALL: attr->instrumentation = LTTNG_KERNEL_ALL; @@ -479,6 +477,233 @@ error: return ret; } +/* + * Allocate and initialize a kernel token event rule. + * + * Return pointer to structure or NULL. + */ +enum lttng_error_code trace_kernel_create_event_notifier_rule( + struct lttng_trigger *trigger, + uint64_t token, + struct ltt_kernel_event_notifier_rule **event_notifier_rule) +{ + enum lttng_error_code ret = LTTNG_OK; + enum lttng_condition_type condition_type; + enum lttng_event_rule_type event_rule_type; + enum lttng_condition_status condition_status; + struct ltt_kernel_event_notifier_rule *local_kernel_token_event_rule; + const struct lttng_condition *condition = NULL; + const struct lttng_event_rule *event_rule = NULL; + + assert(event_notifier_rule); + + condition = lttng_trigger_get_const_condition(trigger); + assert(condition); + + condition_type = lttng_condition_get_type(condition); + assert(condition_type == LTTNG_CONDITION_TYPE_ON_EVENT); + + condition_status = lttng_condition_on_event_get_rule( + condition, &event_rule); + assert(condition_status == LTTNG_CONDITION_STATUS_OK); + assert(event_rule); + + event_rule_type = lttng_event_rule_get_type(event_rule); + assert(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN); + + local_kernel_token_event_rule = + zmalloc(sizeof(struct ltt_kernel_event_notifier_rule)); + if (local_kernel_token_event_rule == NULL) { + PERROR("Failed to allocate ltt_kernel_token_event_rule structure"); + ret = LTTNG_ERR_NOMEM; + goto error; + } + + local_kernel_token_event_rule->fd = -1; + local_kernel_token_event_rule->enabled = 1; + local_kernel_token_event_rule->token = token; + + /* Get the reference of the event rule. */ + lttng_trigger_get(trigger); + + local_kernel_token_event_rule->trigger = trigger; + /* The event rule still owns the filter and bytecode. */ + local_kernel_token_event_rule->filter = + lttng_event_rule_get_filter_bytecode(event_rule); + + DBG3("Created kernel event notifier rule: token = %" PRIu64, + local_kernel_token_event_rule->token); +error: + *event_notifier_rule = local_kernel_token_event_rule; + return ret; +} + +/* + * Initialize a kernel trigger from an event rule. + */ +enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule( + const struct lttng_event_rule *rule, + struct lttng_kernel_event_notifier *kernel_event_notifier) +{ + enum lttng_error_code ret_code; + const char *name; + int strncpy_ret; + + switch (lttng_event_rule_get_type(rule)) { + case LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE: + { + uint64_t address = 0, offset = 0; + const char *symbol_name = NULL; + const struct lttng_kernel_probe_location *location = NULL; + enum lttng_kernel_probe_location_status k_status; + enum lttng_event_rule_status status; + + status = lttng_event_rule_kernel_probe_get_location(rule, &location); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; + goto error; + } + + switch (lttng_kernel_probe_location_get_type(location)) { + case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS: + { + k_status = lttng_kernel_probe_location_address_get_address( + location, &address); + assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK); + break; + } + case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET: + { + k_status = lttng_kernel_probe_location_symbol_get_offset( + location, &offset); + assert(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK); + symbol_name = lttng_kernel_probe_location_symbol_get_name( + location); + break; + } + default: + abort(); + } + + kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_KPROBE; + kernel_event_notifier->event.u.kprobe.addr = address; + kernel_event_notifier->event.u.kprobe.offset = offset; + if (symbol_name) { + strncpy_ret = lttng_strncpy( + kernel_event_notifier->event.u.kprobe.symbol_name, + symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); + + if (strncpy_ret) { + ret_code = LTTNG_ERR_INVALID; + goto error; + } + } + + kernel_event_notifier->event.u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; + + status = lttng_event_rule_kernel_probe_get_event_name(rule, &name); + assert(status == LTTNG_EVENT_RULE_STATUS_OK); + ret_code = LTTNG_OK; + break; + } + case LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE: + { + const struct lttng_userspace_probe_location* location = NULL; + const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; + enum lttng_event_rule_status status; + + status = lttng_event_rule_userspace_probe_get_location(rule, &location); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; + goto error; + } + + kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_UPROBE; + + lookup = lttng_userspace_probe_location_get_lookup_method( + location); + if (!lookup) { + ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; + goto error; + } + + /* + * From the kernel tracer's perspective, all userspace probe + * event types are all the same: a file and an offset. + */ + switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { + case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: + /* Get the file descriptor on the target binary. */ + kernel_event_notifier->event.u.uprobe.fd = + lttng_userspace_probe_location_function_get_binary_fd(location); + + break; + case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: + /* Get the file descriptor on the target binary. */ + kernel_event_notifier->event.u.uprobe.fd = + lttng_userspace_probe_location_tracepoint_get_binary_fd(location); + break; + default: + abort(); + } + + status = lttng_event_rule_userspace_probe_get_event_name( + rule, &name); + assert(status == LTTNG_EVENT_RULE_STATUS_OK); + ret_code = LTTNG_OK; + break; + } + case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: + { + const enum lttng_domain_type domain = + lttng_event_rule_get_domain_type(rule); + const enum lttng_event_rule_status status = + lttng_event_rule_tracepoint_get_pattern( + rule, &name); + + assert(domain == LTTNG_DOMAIN_KERNEL); + assert(status == LTTNG_EVENT_RULE_STATUS_OK); + kernel_event_notifier->event.instrumentation = + LTTNG_KERNEL_TRACEPOINT; + + ret_code = LTTNG_OK; + break; + } + case LTTNG_EVENT_RULE_TYPE_SYSCALL: + { + const enum lttng_event_rule_status status = + lttng_event_rule_syscall_get_pattern( + rule, &name); + + assert(status == LTTNG_EVENT_RULE_STATUS_OK); + + kernel_event_notifier->event.instrumentation = + LTTNG_KERNEL_SYSCALL; + kernel_event_notifier->event.u.syscall.abi = + LTTNG_KERNEL_SYSCALL_ABI_ALL; + kernel_event_notifier->event.u.syscall.entryexit = + LTTNG_KERNEL_SYSCALL_ENTRY; + kernel_event_notifier->event.u.syscall.match = + LTTNG_KERNEL_SYSCALL_MATCH_NAME; + ret_code = LTTNG_OK; + break; + } + case LTTNG_EVENT_RULE_TYPE_KERNEL_FUNCTION: + default: + abort(); + break; + } + + strncpy_ret = lttng_strncpy(kernel_event_notifier->event.name, name, + LTTNG_KERNEL_SYM_NAME_LEN); + if (strncpy_ret) { + ret_code = LTTNG_ERR_INVALID; + goto error; + } + +error: + return ret_code; +} /* * Allocate and initialize a kernel metadata. * @@ -621,7 +846,7 @@ void trace_kernel_destroy_event(struct ltt_kernel_event *event) PERROR("close"); } } else { - DBG("[trace] Tearing down event (no associated fd)"); + DBG("[trace] Tearing down event (no associated file descriptor)"); } /* Remove from event list */ @@ -634,6 +859,38 @@ void trace_kernel_destroy_event(struct ltt_kernel_event *event) free(event); } +/* + * Cleanup kernel event structure. + */ +static void free_token_event_rule_rcu(struct rcu_head *rcu_node) +{ + struct ltt_kernel_event_notifier_rule *rule = caa_container_of(rcu_node, + struct ltt_kernel_event_notifier_rule, rcu_node); + + free(rule); +} + +void trace_kernel_destroy_event_notifier_rule( + struct ltt_kernel_event_notifier_rule *event) +{ + assert(event); + + if (event->fd >= 0) { + const int ret = close(event->fd); + + DBG("Closing kernel event notifier rule file descriptor: fd = %d", + event->fd); + if (ret) { + PERROR("Failed to close kernel event notifier file descriptor: fd = %d", + event->fd); + } + } else { + DBG("Destroying kernel event notifier rule (no associated file descriptor)"); + } + + lttng_trigger_put(event->trigger); + call_rcu(&event->rcu_node, free_token_event_rule_rcu); +} /* * Cleanup kernel context structure. */