X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=ltt-events.c;h=03dbb2036af923e3c60841783bca3f46ac528c00;hb=edb5c2da83545004c5f556accb79d010a6b1e3a9;hp=f3f7ab78152bb31ac624cbe0f3553d2c292d92a5;hpb=1c25284c690cd38b71789c4024089d28de21caea;p=lttng-modules.git diff --git a/ltt-events.c b/ltt-events.c index f3f7ab78..03dbb203 100644 --- a/ltt-events.c +++ b/ltt-events.c @@ -4,6 +4,8 @@ * Copyright 2010 (c) - Mathieu Desnoyers * * Holds LTTng per-session event registry. + * + * Dual LGPL v2.1/GPL v2 license. */ #include @@ -11,15 +13,28 @@ #include #include #include -#include /* For vmalloc_sync_all */ +#include +#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 synchronize_trace(void) +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 @@ -32,10 +47,12 @@ struct ltt_session *ltt_session_create(void) struct ltt_session *session; mutex_lock(&sessions_mutex); - session = kmalloc(sizeof(struct ltt_session), GFP_KERNEL); + 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; @@ -45,9 +62,18 @@ void ltt_session_destroy(struct ltt_session *session) { struct ltt_channel *chan, *tmpchan; struct ltt_event *event, *tmpevent; + int ret; mutex_lock(&sessions_mutex); - session->active = 0; + 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); @@ -58,23 +84,41 @@ void ltt_session_destroy(struct ltt_session *session) kfree(session); } -int ltt_session_start(struct ltt_session *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; } - session->active = 1; - synchronize_trace(); /* Wait for in-flight events to complete */ + + /* + * 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_stop(struct ltt_session *session) +int ltt_session_disable(struct ltt_session *session) { int ret = 0; @@ -83,49 +127,121 @@ int ltt_session_stop(struct ltt_session *session) ret = -EBUSY; goto end; } - session->active = 0; - synchronize_trace(); /* Wait for in-flight events to complete */ + 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, - int overwrite, void *buf_addr, + 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, *tran_iter; - char *transport_name; + struct ltt_transport *transport = NULL; mutex_lock(&sessions_mutex); - if (session->active) + if (session->been_active) goto active; /* Refuse to add channel to active session */ - transport_name = overwrite ? "relay-overwrite" : "relay-discard"; - list_for_each_entry(tran_iter, <t_transport_list, node) { - if (!strcmp(tran_iter->name, transport_name)) { - transport = tran_iter; - break; - } + transport = ltt_transport_find(transport_name); + if (!transport) { + printk(KERN_WARNING "LTTng transport %s not found\n", + transport_name); + goto notransport; } - if (!transport) + if (!try_module_get(transport->owner)) { + printk(KERN_WARNING "LTT : Can't lock transport module.\n"); goto notransport; - chan = kmalloc(sizeof(struct ltt_channel), GFP_KERNEL); + } + chan = kzalloc(sizeof(struct ltt_channel), GFP_KERNEL); if (!chan) goto nomem; chan->session = session; - init_waitqueue_head(&chan->notify_wait); - chan->chan = transport->ops.channel_create("[lttng]", session, buf_addr, + 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); @@ -135,19 +251,23 @@ active: /* * 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, char *name, - enum instrum_type itype, - void *probe, void *filter) +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; @@ -156,41 +276,114 @@ struct ltt_event *ltt_event_create(struct ltt_channel *chan, char *name, if (chan->free_event_id == -1UL) goto full; /* - * This is O(n^2) (for each event loop called at event creation). - * Might require a hash if we have lots of events. + * 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->name, name)) + if (!strcmp(event->desc->name, event_param->name)) goto exist; event = kmem_cache_zalloc(event_cache, GFP_KERNEL); if (!event) goto cache_error; - event->name = kmalloc(strlen(name) + 1, GFP_KERNEL); - if (!event->name) - goto name_error; - strcpy(event->name, name); event->chan = chan; - event->probe = probe; event->filter = filter; event->id = chan->free_event_id++; - event->itype = itype; + event->enabled = 1; + event->instrumentation = event_param->instrumentation; /* Populate ltt_event structure before tracepoint registration. */ smp_wmb(); - switch (itype) { - case INSTRUM_TRACEPOINTS: - ret = tracepoint_probe_register(name, probe, event); + 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: - kfree(event->name); -name_error: kmem_cache_free(event_cache, event); cache_error: exist: @@ -202,22 +395,543 @@ full: /* * Only used internally at session destruction. */ -int _ltt_event_destroy(struct ltt_event *event) +int _ltt_event_unregister(struct ltt_event *event) { int ret = -EINVAL; - switch (event->itype) { - case INSTRUM_TRACEPOINTS: - ret = tracepoint_probe_unregister(event->name, event->probe, + 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); } - kfree(event->name); + 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 {\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 {\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; } @@ -240,7 +954,7 @@ void ltt_transport_register(struct ltt_transport *transport) * registered. We deal with this here so we don't have to call * vmalloc_sync_all() in each module's init. */ - vmalloc_sync_all(); + wrapper_vmalloc_sync_all(); mutex_lock(&sessions_mutex); list_add_tail(&transport->node, <t_transport_list); @@ -260,7 +974,6 @@ void ltt_transport_unregister(struct ltt_transport *transport) } EXPORT_SYMBOL_GPL(ltt_transport_unregister); - static int __init ltt_events_init(void) { int ret; @@ -268,11 +981,11 @@ static int __init ltt_events_init(void) event_cache = KMEM_CACHE(ltt_event, 0); if (!event_cache) return -ENOMEM; - ret = ltt_debugfs_abi_init(); + ret = lttng_abi_init(); if (ret) - goto error; + goto error_abi; return 0; -error: +error_abi: kmem_cache_destroy(event_cache); return ret; } @@ -283,7 +996,7 @@ static void __exit ltt_events_exit(void) { struct ltt_session *session, *tmpsession; - ltt_debugfs_abi_exit(); + lttng_abi_exit(); list_for_each_entry_safe(session, tmpsession, &sessions, list) ltt_session_destroy(session); kmem_cache_destroy(event_cache);