diff options
Diffstat (limited to 'drivers/staging/lttng/ltt-events.c')
| -rw-r--r-- | drivers/staging/lttng/ltt-events.c | 1009 |
1 files changed, 0 insertions, 1009 deletions
diff --git a/drivers/staging/lttng/ltt-events.c b/drivers/staging/lttng/ltt-events.c deleted file mode 100644 index 42299142ecf2..000000000000 --- a/drivers/staging/lttng/ltt-events.c +++ /dev/null @@ -1,1009 +0,0 @@ -/* - * ltt-events.c - * - * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - * - * Holds LTTng per-session event registry. - * - * Dual LGPL v2.1/GPL v2 license. - */ - -#include <linux/module.h> -#include <linux/list.h> -#include <linux/mutex.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/jiffies.h> -#include "wrapper/uuid.h" -#include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ -#include "ltt-events.h" -#include "ltt-tracer.h" - -static LIST_HEAD(sessions); -static LIST_HEAD(ltt_transport_list); -static DEFINE_MUTEX(sessions_mutex); -static struct kmem_cache *event_cache; - -static void _ltt_event_destroy(struct ltt_event *event); -static void _ltt_channel_destroy(struct ltt_channel *chan); -static int _ltt_event_unregister(struct ltt_event *event); -static -int _ltt_event_metadata_statedump(struct ltt_session *session, - struct ltt_channel *chan, - struct ltt_event *event); -static -int _ltt_session_metadata_statedump(struct ltt_session *session); - -void synchronize_trace(void) -{ - synchronize_sched(); -#ifdef CONFIG_PREEMPT_RT - synchronize_rcu(); -#endif -} - -struct ltt_session *ltt_session_create(void) -{ - struct ltt_session *session; - - mutex_lock(&sessions_mutex); - session = kzalloc(sizeof(struct ltt_session), GFP_KERNEL); - if (!session) - return NULL; - INIT_LIST_HEAD(&session->chan); - INIT_LIST_HEAD(&session->events); - uuid_le_gen(&session->uuid); - list_add(&session->list, &sessions); - mutex_unlock(&sessions_mutex); - return session; -} - -void ltt_session_destroy(struct ltt_session *session) -{ - struct ltt_channel *chan, *tmpchan; - struct ltt_event *event, *tmpevent; - int ret; - - mutex_lock(&sessions_mutex); - ACCESS_ONCE(session->active) = 0; - list_for_each_entry(chan, &session->chan, list) { - ret = lttng_syscalls_unregister(chan); - WARN_ON(ret); - } - list_for_each_entry(event, &session->events, list) { - ret = _ltt_event_unregister(event); - WARN_ON(ret); - } - synchronize_trace(); /* Wait for in-flight events to complete */ - list_for_each_entry_safe(event, tmpevent, &session->events, list) - _ltt_event_destroy(event); - list_for_each_entry_safe(chan, tmpchan, &session->chan, list) - _ltt_channel_destroy(chan); - list_del(&session->list); - mutex_unlock(&sessions_mutex); - kfree(session); -} - -int ltt_session_enable(struct ltt_session *session) -{ - int ret = 0; - struct ltt_channel *chan; - - mutex_lock(&sessions_mutex); - if (session->active) { - ret = -EBUSY; - goto end; - } - - /* - * Snapshot the number of events per channel to know the type of header - * we need to use. - */ - list_for_each_entry(chan, &session->chan, list) { - if (chan->header_type) - continue; /* don't change it if session stop/restart */ - if (chan->free_event_id < 31) - chan->header_type = 1; /* compact */ - else - chan->header_type = 2; /* large */ - } - - ACCESS_ONCE(session->active) = 1; - ACCESS_ONCE(session->been_active) = 1; - ret = _ltt_session_metadata_statedump(session); - if (ret) - ACCESS_ONCE(session->active) = 0; -end: - mutex_unlock(&sessions_mutex); - return ret; -} - -int ltt_session_disable(struct ltt_session *session) -{ - int ret = 0; - - mutex_lock(&sessions_mutex); - if (!session->active) { - ret = -EBUSY; - goto end; - } - ACCESS_ONCE(session->active) = 0; -end: - mutex_unlock(&sessions_mutex); - return ret; -} - -int ltt_channel_enable(struct ltt_channel *channel) -{ - int old; - - if (channel == channel->session->metadata) - return -EPERM; - old = xchg(&channel->enabled, 1); - if (old) - return -EEXIST; - return 0; -} - -int ltt_channel_disable(struct ltt_channel *channel) -{ - int old; - - if (channel == channel->session->metadata) - return -EPERM; - old = xchg(&channel->enabled, 0); - if (!old) - return -EEXIST; - return 0; -} - -int ltt_event_enable(struct ltt_event *event) -{ - int old; - - if (event->chan == event->chan->session->metadata) - return -EPERM; - old = xchg(&event->enabled, 1); - if (old) - return -EEXIST; - return 0; -} - -int ltt_event_disable(struct ltt_event *event) -{ - int old; - - if (event->chan == event->chan->session->metadata) - return -EPERM; - old = xchg(&event->enabled, 0); - if (!old) - return -EEXIST; - return 0; -} - -static struct ltt_transport *ltt_transport_find(const char *name) -{ - struct ltt_transport *transport; - - list_for_each_entry(transport, <t_transport_list, node) { - if (!strcmp(transport->name, name)) - return transport; - } - return NULL; -} - -struct ltt_channel *ltt_channel_create(struct ltt_session *session, - const char *transport_name, - void *buf_addr, - size_t subbuf_size, size_t num_subbuf, - unsigned int switch_timer_interval, - unsigned int read_timer_interval) -{ - struct ltt_channel *chan; - struct ltt_transport *transport = NULL; - - mutex_lock(&sessions_mutex); - if (session->been_active) - goto active; /* Refuse to add channel to active session */ - transport = ltt_transport_find(transport_name); - if (!transport) { - printk(KERN_WARNING "LTTng transport %s not found\n", - transport_name); - goto notransport; - } - if (!try_module_get(transport->owner)) { - printk(KERN_WARNING "LTT : Can't lock transport module.\n"); - goto notransport; - } - chan = kzalloc(sizeof(struct ltt_channel), GFP_KERNEL); - if (!chan) - goto nomem; - chan->session = session; - chan->id = session->free_chan_id++; - /* - * Note: the channel creation op already writes into the packet - * headers. Therefore the "chan" information used as input - * should be already accessible. - */ - chan->chan = transport->ops.channel_create("[lttng]", chan, buf_addr, - subbuf_size, num_subbuf, switch_timer_interval, - read_timer_interval); - if (!chan->chan) - goto create_error; - chan->enabled = 1; - chan->ops = &transport->ops; - chan->transport = transport; - list_add(&chan->list, &session->chan); - mutex_unlock(&sessions_mutex); - return chan; - -create_error: - kfree(chan); -nomem: - if (transport) - module_put(transport->owner); -notransport: -active: - mutex_unlock(&sessions_mutex); - return NULL; -} - -/* - * Only used internally at session destruction. - */ -static -void _ltt_channel_destroy(struct ltt_channel *chan) -{ - chan->ops->channel_destroy(chan->chan); - module_put(chan->transport->owner); - list_del(&chan->list); - lttng_destroy_context(chan->ctx); - kfree(chan); -} - -/* - * Supports event creation while tracing session is active. - */ -struct ltt_event *ltt_event_create(struct ltt_channel *chan, - struct lttng_kernel_event *event_param, - void *filter, - const struct lttng_event_desc *internal_desc) -{ - struct ltt_event *event; - int ret; - - mutex_lock(&sessions_mutex); - if (chan->free_event_id == -1UL) - goto full; - /* - * This is O(n^2) (for each event, the loop is called at event - * creation). Might require a hash if we have lots of events. - */ - list_for_each_entry(event, &chan->session->events, list) - if (!strcmp(event->desc->name, event_param->name)) - goto exist; - event = kmem_cache_zalloc(event_cache, GFP_KERNEL); - if (!event) - goto cache_error; - event->chan = chan; - event->filter = filter; - event->id = chan->free_event_id++; - event->enabled = 1; - event->instrumentation = event_param->instrumentation; - /* Populate ltt_event structure before tracepoint registration. */ - smp_wmb(); - switch (event_param->instrumentation) { - case LTTNG_KERNEL_TRACEPOINT: - event->desc = ltt_event_get(event_param->name); - if (!event->desc) - goto register_error; - ret = tracepoint_probe_register(event_param->name, - event->desc->probe_callback, - event); - if (ret) - goto register_error; - break; - case LTTNG_KERNEL_KPROBE: - ret = lttng_kprobes_register(event_param->name, - event_param->u.kprobe.symbol_name, - event_param->u.kprobe.offset, - event_param->u.kprobe.addr, - event); - if (ret) - goto register_error; - ret = try_module_get(event->desc->owner); - WARN_ON_ONCE(!ret); - break; - case LTTNG_KERNEL_KRETPROBE: - { - struct ltt_event *event_return; - - /* kretprobe defines 2 events */ - event_return = - kmem_cache_zalloc(event_cache, GFP_KERNEL); - if (!event_return) - goto register_error; - event_return->chan = chan; - event_return->filter = filter; - event_return->id = chan->free_event_id++; - event_return->enabled = 1; - event_return->instrumentation = event_param->instrumentation; - /* - * Populate ltt_event structure before kretprobe registration. - */ - smp_wmb(); - ret = lttng_kretprobes_register(event_param->name, - event_param->u.kretprobe.symbol_name, - event_param->u.kretprobe.offset, - event_param->u.kretprobe.addr, - event, event_return); - if (ret) { - kmem_cache_free(event_cache, event_return); - goto register_error; - } - /* Take 2 refs on the module: one per event. */ - ret = try_module_get(event->desc->owner); - WARN_ON_ONCE(!ret); - ret = try_module_get(event->desc->owner); - WARN_ON_ONCE(!ret); - ret = _ltt_event_metadata_statedump(chan->session, chan, - event_return); - if (ret) { - kmem_cache_free(event_cache, event_return); - module_put(event->desc->owner); - module_put(event->desc->owner); - goto statedump_error; - } - list_add(&event_return->list, &chan->session->events); - break; - } - case LTTNG_KERNEL_FUNCTION: - ret = lttng_ftrace_register(event_param->name, - event_param->u.ftrace.symbol_name, - event); - if (ret) - goto register_error; - ret = try_module_get(event->desc->owner); - WARN_ON_ONCE(!ret); - break; - case LTTNG_KERNEL_NOOP: - event->desc = internal_desc; - if (!event->desc) - goto register_error; - break; - default: - WARN_ON_ONCE(1); - } - ret = _ltt_event_metadata_statedump(chan->session, chan, event); - if (ret) - goto statedump_error; - list_add(&event->list, &chan->session->events); - mutex_unlock(&sessions_mutex); - return event; - -statedump_error: - /* If a statedump error occurs, events will not be readable. */ -register_error: - kmem_cache_free(event_cache, event); -cache_error: -exist: -full: - mutex_unlock(&sessions_mutex); - return NULL; -} - -/* - * Only used internally at session destruction. - */ -int _ltt_event_unregister(struct ltt_event *event) -{ - int ret = -EINVAL; - - switch (event->instrumentation) { - case LTTNG_KERNEL_TRACEPOINT: - ret = tracepoint_probe_unregister(event->desc->name, - event->desc->probe_callback, - event); - if (ret) - return ret; - break; - case LTTNG_KERNEL_KPROBE: - lttng_kprobes_unregister(event); - ret = 0; - break; - case LTTNG_KERNEL_KRETPROBE: - lttng_kretprobes_unregister(event); - ret = 0; - break; - case LTTNG_KERNEL_FUNCTION: - lttng_ftrace_unregister(event); - ret = 0; - break; - case LTTNG_KERNEL_NOOP: - ret = 0; - break; - default: - WARN_ON_ONCE(1); - } - return ret; -} - -/* - * Only used internally at session destruction. - */ -static -void _ltt_event_destroy(struct ltt_event *event) -{ - switch (event->instrumentation) { - case LTTNG_KERNEL_TRACEPOINT: - ltt_event_put(event->desc); - break; - case LTTNG_KERNEL_KPROBE: - module_put(event->desc->owner); - lttng_kprobes_destroy_private(event); - break; - case LTTNG_KERNEL_KRETPROBE: - module_put(event->desc->owner); - lttng_kretprobes_destroy_private(event); - break; - case LTTNG_KERNEL_FUNCTION: - module_put(event->desc->owner); - lttng_ftrace_destroy_private(event); - break; - case LTTNG_KERNEL_NOOP: - break; - default: - WARN_ON_ONCE(1); - } - list_del(&event->list); - lttng_destroy_context(event->ctx); - kmem_cache_free(event_cache, event); -} - -/* - * We have exclusive access to our metadata buffer (protected by the - * sessions_mutex), so we can do racy operations such as looking for - * remaining space left in packet and write, since mutual exclusion - * protects us from concurrent writes. - */ -int lttng_metadata_printf(struct ltt_session *session, - const char *fmt, ...) -{ - struct lib_ring_buffer_ctx ctx; - struct ltt_channel *chan = session->metadata; - char *str; - int ret = 0, waitret; - size_t len, reserve_len, pos; - va_list ap; - - WARN_ON_ONCE(!ACCESS_ONCE(session->active)); - - va_start(ap, fmt); - str = kvasprintf(GFP_KERNEL, fmt, ap); - va_end(ap); - if (!str) - return -ENOMEM; - - len = strlen(str); - pos = 0; - - for (pos = 0; pos < len; pos += reserve_len) { - reserve_len = min_t(size_t, - chan->ops->packet_avail_size(chan->chan), - len - pos); - lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, - sizeof(char), -1); - /* - * We don't care about metadata buffer's records lost - * count, because we always retry here. Report error if - * we need to bail out after timeout or being - * interrupted. - */ - waitret = wait_event_interruptible_timeout(*chan->ops->get_writer_buf_wait_queue(chan->chan, -1), - ({ - ret = chan->ops->event_reserve(&ctx, 0); - ret != -ENOBUFS || !ret; - }), - msecs_to_jiffies(LTTNG_METADATA_TIMEOUT_MSEC)); - if (!waitret || waitret == -ERESTARTSYS || ret) { - printk(KERN_WARNING "LTTng: Failure to write metadata to buffers (%s)\n", - waitret == -ERESTARTSYS ? "interrupted" : - (ret == -ENOBUFS ? "timeout" : "I/O error")); - if (waitret == -ERESTARTSYS) - ret = waitret; - goto end; - } - chan->ops->event_write(&ctx, &str[pos], reserve_len); - chan->ops->event_commit(&ctx); - } -end: - kfree(str); - return ret; -} - -static -int _ltt_field_statedump(struct ltt_session *session, - const struct lttng_event_field *field) -{ - int ret = 0; - - switch (field->type.atype) { - case atype_integer: - ret = lttng_metadata_printf(session, - " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", - field->type.u.basic.integer.size, - field->type.u.basic.integer.alignment, - field->type.u.basic.integer.signedness, - (field->type.u.basic.integer.encoding == lttng_encode_none) - ? "none" - : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) - ? "UTF8" - : "ASCII", - field->type.u.basic.integer.base, -#ifdef __BIG_ENDIAN - field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", -#else - field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", -#endif - field->name); - break; - case atype_enum: - ret = lttng_metadata_printf(session, - " %s _%s;\n", - field->type.u.basic.enumeration.name, - field->name); - break; - case atype_array: - { - const struct lttng_basic_type *elem_type; - - elem_type = &field->type.u.array.elem_type; - ret = lttng_metadata_printf(session, - " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", - elem_type->u.basic.integer.size, - elem_type->u.basic.integer.alignment, - elem_type->u.basic.integer.signedness, - (elem_type->u.basic.integer.encoding == lttng_encode_none) - ? "none" - : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) - ? "UTF8" - : "ASCII", - elem_type->u.basic.integer.base, -#ifdef __BIG_ENDIAN - elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", -#else - elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", -#endif - field->name, field->type.u.array.length); - break; - } - case atype_sequence: - { - const struct lttng_basic_type *elem_type; - const struct lttng_basic_type *length_type; - - elem_type = &field->type.u.sequence.elem_type; - length_type = &field->type.u.sequence.length_type; - ret = lttng_metadata_printf(session, - " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", - length_type->u.basic.integer.size, - (unsigned int) length_type->u.basic.integer.alignment, - length_type->u.basic.integer.signedness, - (length_type->u.basic.integer.encoding == lttng_encode_none) - ? "none" - : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) - ? "UTF8" - : "ASCII"), - length_type->u.basic.integer.base, -#ifdef __BIG_ENDIAN - length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", -#else - length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", -#endif - field->name); - if (ret) - return ret; - - ret = lttng_metadata_printf(session, - " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", - elem_type->u.basic.integer.size, - (unsigned int) elem_type->u.basic.integer.alignment, - elem_type->u.basic.integer.signedness, - (elem_type->u.basic.integer.encoding == lttng_encode_none) - ? "none" - : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) - ? "UTF8" - : "ASCII"), - elem_type->u.basic.integer.base, -#ifdef __BIG_ENDIAN - elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", -#else - elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", -#endif - field->name, - field->name); - break; - } - - case atype_string: - /* Default encoding is UTF8 */ - ret = lttng_metadata_printf(session, - " string%s _%s;\n", - field->type.u.basic.string.encoding == lttng_encode_ASCII ? - " { encoding = ASCII; }" : "", - field->name); - break; - default: - WARN_ON_ONCE(1); - return -EINVAL; - } - return ret; -} - -static -int _ltt_context_metadata_statedump(struct ltt_session *session, - struct lttng_ctx *ctx) -{ - int ret = 0; - int i; - - if (!ctx) - return 0; - for (i = 0; i < ctx->nr_fields; i++) { - const struct lttng_ctx_field *field = &ctx->fields[i]; - - ret = _ltt_field_statedump(session, &field->event_field); - if (ret) - return ret; - } - return ret; -} - -static -int _ltt_fields_metadata_statedump(struct ltt_session *session, - struct ltt_event *event) -{ - const struct lttng_event_desc *desc = event->desc; - int ret = 0; - int i; - - for (i = 0; i < desc->nr_fields; i++) { - const struct lttng_event_field *field = &desc->fields[i]; - - ret = _ltt_field_statedump(session, field); - if (ret) - return ret; - } - return ret; -} - -static -int _ltt_event_metadata_statedump(struct ltt_session *session, - struct ltt_channel *chan, - struct ltt_event *event) -{ - int ret = 0; - - if (event->metadata_dumped || !ACCESS_ONCE(session->active)) - return 0; - if (chan == session->metadata) - return 0; - - ret = lttng_metadata_printf(session, - "event {\n" - " name = %s;\n" - " id = %u;\n" - " stream_id = %u;\n", - event->desc->name, - event->id, - event->chan->id); - if (ret) - goto end; - - if (event->ctx) { - ret = lttng_metadata_printf(session, - " context := struct {\n"); - if (ret) - goto end; - } - ret = _ltt_context_metadata_statedump(session, event->ctx); - if (ret) - goto end; - if (event->ctx) { - ret = lttng_metadata_printf(session, - " };\n"); - if (ret) - goto end; - } - - ret = lttng_metadata_printf(session, - " fields := struct {\n" - ); - if (ret) - goto end; - - ret = _ltt_fields_metadata_statedump(session, event); - if (ret) - goto end; - - /* - * LTTng space reservation can only reserve multiples of the - * byte size. - */ - ret = lttng_metadata_printf(session, - " };\n" - "};\n\n"); - if (ret) - goto end; - - event->metadata_dumped = 1; -end: - return ret; - -} - -static -int _ltt_channel_metadata_statedump(struct ltt_session *session, - struct ltt_channel *chan) -{ - int ret = 0; - - if (chan->metadata_dumped || !ACCESS_ONCE(session->active)) - return 0; - if (chan == session->metadata) - return 0; - - WARN_ON_ONCE(!chan->header_type); - ret = lttng_metadata_printf(session, - "stream {\n" - " id = %u;\n" - " event.header := %s;\n" - " packet.context := struct packet_context;\n", - chan->id, - chan->header_type == 1 ? "struct event_header_compact" : - "struct event_header_large"); - if (ret) - goto end; - - if (chan->ctx) { - ret = lttng_metadata_printf(session, - " event.context := struct {\n"); - if (ret) - goto end; - } - ret = _ltt_context_metadata_statedump(session, chan->ctx); - if (ret) - goto end; - if (chan->ctx) { - ret = lttng_metadata_printf(session, - " };\n"); - if (ret) - goto end; - } - - ret = lttng_metadata_printf(session, - "};\n\n"); - - chan->metadata_dumped = 1; -end: - return ret; -} - -static -int _ltt_stream_packet_context_declare(struct ltt_session *session) -{ - return lttng_metadata_printf(session, - "struct packet_context {\n" - " uint64_t timestamp_begin;\n" - " uint64_t timestamp_end;\n" - " uint32_t events_discarded;\n" - " uint32_t content_size;\n" - " uint32_t packet_size;\n" - " uint32_t cpu_id;\n" - "};\n\n" - ); -} - -/* - * Compact header: - * id: range: 0 - 30. - * id 31 is reserved to indicate an extended header. - * - * Large header: - * id: range: 0 - 65534. - * id 65535 is reserved to indicate an extended header. - */ -static -int _ltt_event_header_declare(struct ltt_session *session) -{ - return lttng_metadata_printf(session, - "struct event_header_compact {\n" - " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" - " variant <id> {\n" - " struct {\n" - " uint27_t timestamp;\n" - " } compact;\n" - " struct {\n" - " uint32_t id;\n" - " uint64_t timestamp;\n" - " } extended;\n" - " } v;\n" - "} align(%u);\n" - "\n" - "struct event_header_large {\n" - " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" - " variant <id> {\n" - " struct {\n" - " uint32_t timestamp;\n" - " } compact;\n" - " struct {\n" - " uint32_t id;\n" - " uint64_t timestamp;\n" - " } extended;\n" - " } v;\n" - "} align(%u);\n\n", - ltt_alignof(uint32_t) * CHAR_BIT, - ltt_alignof(uint16_t) * CHAR_BIT - ); -} - -/* - * Output metadata into this session's metadata buffers. - */ -static -int _ltt_session_metadata_statedump(struct ltt_session *session) -{ - unsigned char *uuid_c = session->uuid.b; - unsigned char uuid_s[37]; - struct ltt_channel *chan; - struct ltt_event *event; - int ret = 0; - - if (!ACCESS_ONCE(session->active)) - return 0; - if (session->metadata_dumped) - goto skip_session; - if (!session->metadata) { - printk(KERN_WARNING "LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); - return -EPERM; - } - - snprintf(uuid_s, sizeof(uuid_s), - "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", - uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], - uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], - uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], - uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); - - ret = lttng_metadata_printf(session, - "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" - "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" - "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" - "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" - "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" - "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" - "\n" - "trace {\n" - " major = %u;\n" - " minor = %u;\n" - " uuid = \"%s\";\n" - " byte_order = %s;\n" - " packet.header := struct {\n" - " uint32_t magic;\n" - " uint8_t uuid[16];\n" - " uint32_t stream_id;\n" - " };\n" - "};\n\n", - ltt_alignof(uint8_t) * CHAR_BIT, - ltt_alignof(uint16_t) * CHAR_BIT, - ltt_alignof(uint32_t) * CHAR_BIT, - ltt_alignof(uint64_t) * CHAR_BIT, - CTF_VERSION_MAJOR, - CTF_VERSION_MINOR, - uuid_s, -#ifdef __BIG_ENDIAN - "be" -#else - "le" -#endif - ); - if (ret) - goto end; - - ret = _ltt_stream_packet_context_declare(session); - if (ret) - goto end; - - ret = _ltt_event_header_declare(session); - if (ret) - goto end; - -skip_session: - list_for_each_entry(chan, &session->chan, list) { - ret = _ltt_channel_metadata_statedump(session, chan); - if (ret) - goto end; - } - - list_for_each_entry(event, &session->events, list) { - ret = _ltt_event_metadata_statedump(session, event->chan, event); - if (ret) - goto end; - } - session->metadata_dumped = 1; -end: - return ret; -} - -/** - * ltt_transport_register - LTT transport registration - * @transport: transport structure - * - * Registers a transport which can be used as output to extract the data out of - * LTTng. The module calling this registration function must ensure that no - * trap-inducing code will be executed by the transport functions. E.g. - * vmalloc_sync_all() must be called between a vmalloc and the moment the memory - * is made visible to the transport function. This registration acts as a - * vmalloc_sync_all. Therefore, only if the module allocates virtual memory - * after its registration must it synchronize the TLBs. - */ -void ltt_transport_register(struct ltt_transport *transport) -{ - /* - * Make sure no page fault can be triggered by the module about to be - * registered. We deal with this here so we don't have to call - * vmalloc_sync_all() in each module's init. - */ - wrapper_vmalloc_sync_all(); - - mutex_lock(&sessions_mutex); - list_add_tail(&transport->node, <t_transport_list); - mutex_unlock(&sessions_mutex); -} -EXPORT_SYMBOL_GPL(ltt_transport_register); - -/** - * ltt_transport_unregister - LTT transport unregistration - * @transport: transport structure - */ -void ltt_transport_unregister(struct ltt_transport *transport) -{ - mutex_lock(&sessions_mutex); - list_del(&transport->node); - mutex_unlock(&sessions_mutex); -} -EXPORT_SYMBOL_GPL(ltt_transport_unregister); - -static int __init ltt_events_init(void) -{ - int ret; - - event_cache = KMEM_CACHE(ltt_event, 0); - if (!event_cache) - return -ENOMEM; - ret = ltt_debugfs_abi_init(); - if (ret) - goto error_abi; - return 0; -error_abi: - kmem_cache_destroy(event_cache); - return ret; -} - -module_init(ltt_events_init); - -static void __exit ltt_events_exit(void) -{ - struct ltt_session *session, *tmpsession; - - ltt_debugfs_abi_exit(); - list_for_each_entry_safe(session, tmpsession, &sessions, list) - ltt_session_destroy(session); - kmem_cache_destroy(event_cache); -} - -module_exit(ltt_events_exit); - -MODULE_LICENSE("GPL and additional rights"); -MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); -MODULE_DESCRIPTION("LTTng Events"); |