diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/Kconfig | 4 | ||||
| -rw-r--r-- | kernel/trace/blktrace.c | 117 | ||||
| -rw-r--r-- | kernel/trace/synth_event_gen_test.c | 44 | ||||
| -rw-r--r-- | kernel/trace/trace.c | 2 | ||||
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 319 | ||||
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 2 |
6 files changed, 290 insertions, 198 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 91e885194dbc..402eef84c859 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -143,8 +143,8 @@ if FTRACE config BOOTTIME_TRACING bool "Boot-time Tracing support" - depends on BOOT_CONFIG && TRACING - default y + depends on TRACING + select BOOT_CONFIG help Enable developer to setup ftrace subsystem via supplemental kernel cmdline at boot time for debugging (tracing) driver diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 0735ae8545d8..ca39dc3230cb 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -335,6 +335,7 @@ static void put_probe_ref(void) static void blk_trace_cleanup(struct blk_trace *bt) { + synchronize_rcu(); blk_trace_free(bt); put_probe_ref(); } @@ -629,8 +630,10 @@ static int compat_blk_trace_setup(struct request_queue *q, char *name, static int __blk_trace_startstop(struct request_queue *q, int start) { int ret; - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + bt = rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex)); if (bt == NULL) return -EINVAL; @@ -740,8 +743,8 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) void blk_trace_shutdown(struct request_queue *q) { mutex_lock(&q->blk_trace_mutex); - - if (q->blk_trace) { + if (rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex))) { __blk_trace_startstop(q, 0); __blk_trace_remove(q); } @@ -752,8 +755,10 @@ void blk_trace_shutdown(struct request_queue *q) #ifdef CONFIG_BLK_CGROUP static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + /* We don't use the 'bt' value here except as an optimization... */ + bt = rcu_dereference_protected(q->blk_trace, 1); if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) return 0; @@ -796,10 +801,14 @@ blk_trace_request_get_cgid(struct request_queue *q, struct request *rq) static void blk_add_trace_rq(struct request *rq, int error, unsigned int nr_bytes, u32 what, u64 cgid) { - struct blk_trace *bt = rq->q->blk_trace; + struct blk_trace *bt; - if (likely(!bt)) + rcu_read_lock(); + bt = rcu_dereference(rq->q->blk_trace); + if (likely(!bt)) { + rcu_read_unlock(); return; + } if (blk_rq_is_passthrough(rq)) what |= BLK_TC_ACT(BLK_TC_PC); @@ -808,6 +817,7 @@ static void blk_add_trace_rq(struct request *rq, int error, __blk_add_trace(bt, blk_rq_trace_sector(rq), nr_bytes, req_op(rq), rq->cmd_flags, what, error, 0, NULL, cgid); + rcu_read_unlock(); } static void blk_add_trace_rq_insert(void *ignore, @@ -853,14 +863,19 @@ static void blk_add_trace_rq_complete(void *ignore, struct request *rq, static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, u32 what, int error) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; - if (likely(!bt)) + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + if (likely(!bt)) { + rcu_read_unlock(); return; + } __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, what, error, 0, NULL, blk_trace_bio_get_cgid(q, bio)); + rcu_read_unlock(); } static void blk_add_trace_bio_bounce(void *ignore, @@ -905,11 +920,14 @@ static void blk_add_trace_getrq(void *ignore, if (bio) blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0); else { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); if (bt) __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0, NULL, 0); + rcu_read_unlock(); } } @@ -921,27 +939,35 @@ static void blk_add_trace_sleeprq(void *ignore, if (bio) blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0); else { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); if (bt) __blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ, 0, 0, NULL, 0); + rcu_read_unlock(); } } static void blk_add_trace_plug(void *ignore, struct request_queue *q) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); if (bt) __blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL, 0); + rcu_read_unlock(); } static void blk_add_trace_unplug(void *ignore, struct request_queue *q, unsigned int depth, bool explicit) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); if (bt) { __be64 rpdu = cpu_to_be64(depth); u32 what; @@ -953,14 +979,17 @@ static void blk_add_trace_unplug(void *ignore, struct request_queue *q, __blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu, 0); } + rcu_read_unlock(); } static void blk_add_trace_split(void *ignore, struct request_queue *q, struct bio *bio, unsigned int pdu) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); if (bt) { __be64 rpdu = cpu_to_be64(pdu); @@ -969,6 +998,7 @@ static void blk_add_trace_split(void *ignore, BLK_TA_SPLIT, bio->bi_status, sizeof(rpdu), &rpdu, blk_trace_bio_get_cgid(q, bio)); } + rcu_read_unlock(); } /** @@ -988,11 +1018,15 @@ static void blk_add_trace_bio_remap(void *ignore, struct request_queue *q, struct bio *bio, dev_t dev, sector_t from) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; struct blk_io_trace_remap r; - if (likely(!bt)) + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + if (likely(!bt)) { + rcu_read_unlock(); return; + } r.device_from = cpu_to_be32(dev); r.device_to = cpu_to_be32(bio_dev(bio)); @@ -1001,6 +1035,7 @@ static void blk_add_trace_bio_remap(void *ignore, __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, BLK_TA_REMAP, bio->bi_status, sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); + rcu_read_unlock(); } /** @@ -1021,11 +1056,15 @@ static void blk_add_trace_rq_remap(void *ignore, struct request *rq, dev_t dev, sector_t from) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; struct blk_io_trace_remap r; - if (likely(!bt)) + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + if (likely(!bt)) { + rcu_read_unlock(); return; + } r.device_from = cpu_to_be32(dev); r.device_to = cpu_to_be32(disk_devt(rq->rq_disk)); @@ -1034,6 +1073,7 @@ static void blk_add_trace_rq_remap(void *ignore, __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rq_data_dir(rq), 0, BLK_TA_REMAP, 0, sizeof(r), &r, blk_trace_request_get_cgid(q, rq)); + rcu_read_unlock(); } /** @@ -1051,14 +1091,19 @@ void blk_add_driver_data(struct request_queue *q, struct request *rq, void *data, size_t len) { - struct blk_trace *bt = q->blk_trace; + struct blk_trace *bt; - if (likely(!bt)) + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + if (likely(!bt)) { + rcu_read_unlock(); return; + } __blk_add_trace(bt, blk_rq_trace_sector(rq), blk_rq_bytes(rq), 0, 0, BLK_TA_DRV_DATA, 0, len, data, blk_trace_request_get_cgid(q, rq)); + rcu_read_unlock(); } EXPORT_SYMBOL_GPL(blk_add_driver_data); @@ -1597,6 +1642,7 @@ static int blk_trace_remove_queue(struct request_queue *q) return -EINVAL; put_probe_ref(); + synchronize_rcu(); blk_trace_free(bt); return 0; } @@ -1758,6 +1804,7 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev, struct hd_struct *p = dev_to_part(dev); struct request_queue *q; struct block_device *bdev; + struct blk_trace *bt; ssize_t ret = -ENXIO; bdev = bdget(part_devt(p)); @@ -1770,21 +1817,23 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev, mutex_lock(&q->blk_trace_mutex); + bt = rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex)); if (attr == &dev_attr_enable) { - ret = sprintf(buf, "%u\n", !!q->blk_trace); + ret = sprintf(buf, "%u\n", !!bt); goto out_unlock_bdev; } - if (q->blk_trace == NULL) + if (bt == NULL) ret = sprintf(buf, "disabled\n"); else if (attr == &dev_attr_act_mask) - ret = blk_trace_mask2str(buf, q->blk_trace->act_mask); + ret = blk_trace_mask2str(buf, bt->act_mask); else if (attr == &dev_attr_pid) - ret = sprintf(buf, "%u\n", q->blk_trace->pid); + ret = sprintf(buf, "%u\n", bt->pid); else if (attr == &dev_attr_start_lba) - ret = sprintf(buf, "%llu\n", q->blk_trace->start_lba); + ret = sprintf(buf, "%llu\n", bt->start_lba); else if (attr == &dev_attr_end_lba) - ret = sprintf(buf, "%llu\n", q->blk_trace->end_lba); + ret = sprintf(buf, "%llu\n", bt->end_lba); out_unlock_bdev: mutex_unlock(&q->blk_trace_mutex); @@ -1801,6 +1850,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, struct block_device *bdev; struct request_queue *q; struct hd_struct *p; + struct blk_trace *bt; u64 value; ssize_t ret = -EINVAL; @@ -1831,8 +1881,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, mutex_lock(&q->blk_trace_mutex); + bt = rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex)); if (attr == &dev_attr_enable) { - if (!!value == !!q->blk_trace) { + if (!!value == !!bt) { ret = 0; goto out_unlock_bdev; } @@ -1844,18 +1896,21 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, } ret = 0; - if (q->blk_trace == NULL) + if (bt == NULL) { ret = blk_trace_setup_queue(q, bdev); + bt = rcu_dereference_protected(q->blk_trace, + lockdep_is_held(&q->blk_trace_mutex)); + } if (ret == 0) { if (attr == &dev_attr_act_mask) - q->blk_trace->act_mask = value; + bt->act_mask = value; else if (attr == &dev_attr_pid) - q->blk_trace->pid = value; + bt->pid = value; else if (attr == &dev_attr_start_lba) - q->blk_trace->start_lba = value; + bt->start_lba = value; else if (attr == &dev_attr_end_lba) - q->blk_trace->end_lba = value; + bt->end_lba = value; } out_unlock_bdev: diff --git a/kernel/trace/synth_event_gen_test.c b/kernel/trace/synth_event_gen_test.c index 4aefe003cb7c..7d56d621ffea 100644 --- a/kernel/trace/synth_event_gen_test.c +++ b/kernel/trace/synth_event_gen_test.c @@ -111,11 +111,11 @@ static int __init test_gen_synth_cmd(void) /* Create some bogus values just for testing */ vals[0] = 777; /* next_pid_field */ - vals[1] = (u64)"hula hoops"; /* next_comm_field */ + vals[1] = (u64)(long)"hula hoops"; /* next_comm_field */ vals[2] = 1000000; /* ts_ns */ vals[3] = 1000; /* ts_ms */ - vals[4] = smp_processor_id(); /* cpu */ - vals[5] = (u64)"thneed"; /* my_string_field */ + vals[4] = raw_smp_processor_id(); /* cpu */ + vals[5] = (u64)(long)"thneed"; /* my_string_field */ vals[6] = 598; /* my_int_field */ /* Now generate a gen_synth_test event */ @@ -218,11 +218,11 @@ static int __init test_empty_synth_event(void) /* Create some bogus values just for testing */ vals[0] = 777; /* next_pid_field */ - vals[1] = (u64)"tiddlywinks"; /* next_comm_field */ + vals[1] = (u64)(long)"tiddlywinks"; /* next_comm_field */ vals[2] = 1000000; /* ts_ns */ vals[3] = 1000; /* ts_ms */ - vals[4] = smp_processor_id(); /* cpu */ - vals[5] = (u64)"thneed_2.0"; /* my_string_field */ + vals[4] = raw_smp_processor_id(); /* cpu */ + vals[5] = (u64)(long)"thneed_2.0"; /* my_string_field */ vals[6] = 399; /* my_int_field */ /* Now trace an empty_synth_test event */ @@ -290,11 +290,11 @@ static int __init test_create_synth_event(void) /* Create some bogus values just for testing */ vals[0] = 777; /* next_pid_field */ - vals[1] = (u64)"tiddlywinks"; /* next_comm_field */ + vals[1] = (u64)(long)"tiddlywinks"; /* next_comm_field */ vals[2] = 1000000; /* ts_ns */ vals[3] = 1000; /* ts_ms */ - vals[4] = smp_processor_id(); /* cpu */ - vals[5] = (u64)"thneed"; /* my_string_field */ + vals[4] = raw_smp_processor_id(); /* cpu */ + vals[5] = (u64)(long)"thneed"; /* my_string_field */ vals[6] = 398; /* my_int_field */ /* Now generate a create_synth_test event */ @@ -330,7 +330,7 @@ static int __init test_add_next_synth_val(void) goto out; /* next_comm_field */ - ret = synth_event_add_next_val((u64)"slinky", &trace_state); + ret = synth_event_add_next_val((u64)(long)"slinky", &trace_state); if (ret) goto out; @@ -345,12 +345,12 @@ static int __init test_add_next_synth_val(void) goto out; /* cpu */ - ret = synth_event_add_next_val(smp_processor_id(), &trace_state); + ret = synth_event_add_next_val(raw_smp_processor_id(), &trace_state); if (ret) goto out; /* my_string_field */ - ret = synth_event_add_next_val((u64)"thneed_2.01", &trace_state); + ret = synth_event_add_next_val((u64)(long)"thneed_2.01", &trace_state); if (ret) goto out; @@ -388,7 +388,7 @@ static int __init test_add_synth_val(void) if (ret) goto out; - ret = synth_event_add_val("cpu", smp_processor_id(), &trace_state); + ret = synth_event_add_val("cpu", raw_smp_processor_id(), &trace_state); if (ret) goto out; @@ -396,12 +396,12 @@ static int __init test_add_synth_val(void) if (ret) goto out; - ret = synth_event_add_val("next_comm_field", (u64)"silly putty", + ret = synth_event_add_val("next_comm_field", (u64)(long)"silly putty", &trace_state); if (ret) goto out; - ret = synth_event_add_val("my_string_field", (u64)"thneed_9", + ret = synth_event_add_val("my_string_field", (u64)(long)"thneed_9", &trace_state); if (ret) goto out; @@ -423,13 +423,13 @@ static int __init test_trace_synth_event(void) /* Trace some bogus values just for testing */ ret = synth_event_trace(create_synth_test, 7, /* number of values */ - 444, /* next_pid_field */ - (u64)"clackers", /* next_comm_field */ - 1000000, /* ts_ns */ - 1000, /* ts_ms */ - smp_processor_id(), /* cpu */ - (u64)"Thneed", /* my_string_field */ - 999); /* my_int_field */ + (u64)444, /* next_pid_field */ + (u64)(long)"clackers", /* next_comm_field */ + (u64)1000000, /* ts_ns */ + (u64)1000, /* ts_ms */ + (u64)raw_smp_processor_id(), /* cpu */ + (u64)(long)"Thneed", /* my_string_field */ + (u64)999); /* my_int_field */ return ret; } diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index c797a15a1fc7..6b11e4e2150c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1837,6 +1837,7 @@ static __init int init_trace_selftests(void) pr_info("Running postponed tracer tests:\n"); + tracing_selftest_running = true; list_for_each_entry_safe(p, n, &postponed_selftests, list) { /* This loop can take minutes when sanitizers are enabled, so * lets make sure we allow RCU processing. @@ -1859,6 +1860,7 @@ static __init int init_trace_selftests(void) list_del(&p->list); kfree(p); } + tracing_selftest_running = false; out: mutex_unlock(&trace_types_lock); diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index e7ce7cdac62f..5f6834a2bf41 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -821,6 +821,29 @@ static const char *synth_field_fmt(char *type) return fmt; } +static void print_synth_event_num_val(struct trace_seq *s, + char *print_fmt, char *name, + int size, u64 val, char *space) +{ + switch (size) { + case 1: + trace_seq_printf(s, print_fmt, name, (u8)val, space); + break; + + case 2: + trace_seq_printf(s, print_fmt, name, (u16)val, space); + break; + + case 4: + trace_seq_printf(s, print_fmt, name, (u32)val, space); + break; + + default: + trace_seq_printf(s, print_fmt, name, val, space); + break; + } +} + static enum print_line_t print_synth_event(struct trace_iterator *iter, int flags, struct trace_event *event) @@ -859,10 +882,13 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, } else { struct trace_print_flags __flags[] = { __def_gfpflag_names, {-1, NULL} }; + char *space = (i == se->n_fields - 1 ? "" : " "); - trace_seq_printf(s, print_fmt, se->fields[i]->name, - entry->fields[n_u64], - i == se->n_fields - 1 ? "" : " "); + print_synth_event_num_val(s, print_fmt, + se->fields[i]->name, + se->fields[i]->size, + entry->fields[n_u64], + space); if (strcmp(se->fields[i]->type, "gfp_t") == 0) { trace_seq_puts(s, " ("); @@ -1798,6 +1824,62 @@ void synth_event_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen) } EXPORT_SYMBOL_GPL(synth_event_cmd_init); +static inline int +__synth_event_trace_start(struct trace_event_file *file, + struct synth_event_trace_state *trace_state) +{ + int entry_size, fields_size = 0; + int ret = 0; + + memset(trace_state, '\0', sizeof(*trace_state)); + + /* + * Normal event tracing doesn't get called at all unless the + * ENABLED bit is set (which attaches the probe thus allowing + * this code to be called, etc). Because this is called + * directly by the user, we don't have that but we still need + * to honor not logging when disabled. For the the iterated + * trace case, we save the enabed state upon start and just + * ignore the following data calls. + */ + if (!(file->flags & EVENT_FILE_FL_ENABLED) || + trace_trigger_soft_disabled(file)) { + trace_state->disabled = true; + ret = -ENOENT; + goto out; + } + + trace_state->event = file->event_call->data; + + fields_size = trace_state->event->n_u64 * sizeof(u64); + + /* + * Avoid ring buffer recursion detection, as this event + * is being performed within another event. + */ + trace_state->buffer = file->tr->array_buffer.buffer; + ring_buffer_nest_start(trace_state->buffer); + + entry_size = sizeof(*trace_state->entry) + fields_size; + trace_state->entry = trace_event_buffer_reserve(&trace_state->fbuffer, + file, + entry_size); + if (!trace_state->entry) { + ring_buffer_nest_end(trace_state->buffer); + ret = -EINVAL; + } +out: + return ret; +} + +static inline void +__synth_event_trace_end(struct synth_event_trace_state *trace_state) +{ + trace_event_buffer_commit(&trace_state->fbuffer); + + ring_buffer_nest_end(trace_state->buffer); +} + /** * synth_event_trace - Trace a synthetic event * @file: The trace_event_file representing the synthetic event @@ -1819,71 +1901,61 @@ EXPORT_SYMBOL_GPL(synth_event_cmd_init); */ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...) { - struct trace_event_buffer fbuffer; - struct synth_trace_event *entry; - struct trace_buffer *buffer; - struct synth_event *event; + struct synth_event_trace_state state; unsigned int i, n_u64; - int fields_size = 0; va_list args; - int ret = 0; - - /* - * Normal event generation doesn't get called at all unless - * the ENABLED bit is set (which attaches the probe thus - * allowing this code to be called, etc). Because this is - * called directly by the user, we don't have that but we - * still need to honor not logging when disabled. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) - return 0; - - event = file->event_call->data; - - if (n_vals != event->n_fields) - return -EINVAL; - - if (trace_trigger_soft_disabled(file)) - return -EINVAL; - - fields_size = event->n_u64 * sizeof(u64); + int ret; - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(buffer); + ret = __synth_event_trace_start(file, &state); + if (ret) { + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ + return ret; + } - entry = trace_event_buffer_reserve(&fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { + if (n_vals != state.event->n_fields) { ret = -EINVAL; goto out; } va_start(args, n_vals); - for (i = 0, n_u64 = 0; i < event->n_fields; i++) { + for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) { u64 val; val = va_arg(args, u64); - if (event->fields[i]->is_string) { + if (state.event->fields[i]->is_string) { char *str_val = (char *)(long)val; - char *str_field = (char *)&entry->fields[n_u64]; + char *str_field = (char *)&state.entry->fields[n_u64]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - entry->fields[n_u64] = val; + struct synth_field *field = state.event->fields[i]; + + switch (field->size) { + case 1: + *(u8 *)&state.entry->fields[n_u64] = (u8)val; + break; + + case 2: + *(u16 *)&state.entry->fields[n_u64] = (u16)val; + break; + + case 4: + *(u32 *)&state.entry->fields[n_u64] = (u32)val; + break; + + default: + state.entry->fields[n_u64] = val; + break; + } n_u64++; } } va_end(args); - - trace_event_buffer_commit(&fbuffer); out: - ring_buffer_nest_end(buffer); + __synth_event_trace_end(&state); return ret; } @@ -1910,64 +1982,55 @@ EXPORT_SYMBOL_GPL(synth_event_trace); int synth_event_trace_array(struct trace_event_file *file, u64 *vals, unsigned int n_vals) { - struct trace_event_buffer fbuffer; - struct synth_trace_event *entry; - struct trace_buffer *buffer; - struct synth_event *event; + struct synth_event_trace_state state; unsigned int i, n_u64; - int fields_size = 0; - int ret = 0; - - /* - * Normal event generation doesn't get called at all unless - * the ENABLED bit is set (which attaches the probe thus - * allowing this code to be called, etc). Because this is - * called directly by the user, we don't have that but we - * still need to honor not logging when disabled. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) - return 0; - - event = file->event_call->data; - - if (n_vals != event->n_fields) - return -EINVAL; - - if (trace_trigger_soft_disabled(file)) - return -EINVAL; - - fields_size = event->n_u64 * sizeof(u64); + int ret; - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(buffer); + ret = __synth_event_trace_start(file, &state); + if (ret) { + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ + return ret; + } - entry = trace_event_buffer_reserve(&fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { + if (n_vals != state.event->n_fields) { ret = -EINVAL; goto out; } - for (i = 0, n_u64 = 0; i < event->n_fields; i++) { - if (event->fields[i]->is_string) { + for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) { + if (state.event->fields[i]->is_string) { char *str_val = (char *)(long)vals[i]; - char *str_field = (char *)&entry->fields[n_u64]; + char *str_field = (char *)&state.entry->fields[n_u64]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - entry->fields[n_u64] = vals[i]; + struct synth_field *field = state.event->fields[i]; + u64 val = vals[i]; + + switch (field->size) { + case 1: + *(u8 *)&state.entry->fields[n_u64] = (u8)val; + break; + + case 2: + *(u16 *)&state.entry->fields[n_u64] = (u16)val; + break; + + case 4: + *(u32 *)&state.entry->fields[n_u64] = (u32)val; + break; + + default: + state.entry->fields[n_u64] = val; + break; + } n_u64++; } } - - trace_event_buffer_commit(&fbuffer); out: - ring_buffer_nest_end(buffer); + __synth_event_trace_end(&state); return ret; } @@ -2004,58 +2067,15 @@ EXPORT_SYMBOL_GPL(synth_event_trace_array); int synth_event_trace_start(struct trace_event_file *file, struct synth_event_trace_state *trace_state) { - struct synth_trace_event *entry; - int fields_size = 0; - int ret = 0; - - if (!trace_state) { - ret = -EINVAL; - goto out; - } - - memset(trace_state, '\0', sizeof(*trace_state)); - - /* - * Normal event tracing doesn't get called at all unless the - * ENABLED bit is set (which attaches the probe thus allowing - * this code to be called, etc). Because this is called - * directly by the user, we don't have that but we still need - * to honor not logging when disabled. For the the iterated - * trace case, we save the enabed state upon start and just - * ignore the following data calls. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) { - trace_state->enabled = false; - goto out; - } - - trace_state->enabled = true; - - trace_state->event = file->event_call->data; - - if (trace_trigger_soft_disabled(file)) { - ret = -EINVAL; - goto out; - } - - fields_size = trace_state->event->n_u64 * sizeof(u64); + int ret; - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - trace_state->buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(trace_state->buffer); + if (!trace_state) + return -EINVAL; - entry = trace_event_buffer_reserve(&trace_state->fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { - ret = -EINVAL; - goto out; - } + ret = __synth_event_trace_start(file, trace_state); + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ - trace_state->entry = entry; -out: return ret; } EXPORT_SYMBOL_GPL(synth_event_trace_start); @@ -2088,7 +2108,7 @@ static int __synth_event_add_val(const char *field_name, u64 val, trace_state->add_next = true; } - if (!trace_state->enabled) + if (trace_state->disabled) goto out; event = trace_state->event; @@ -2122,8 +2142,25 @@ static int __synth_event_add_val(const char *field_name, u64 val, str_field = (char *)&entry->fields[field->offset]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); - } else - entry->fields[field->offset] = val; + } else { + switch (field->size) { + case 1: + *(u8 *)&trace_state->entry->fields[field->offset] = (u8)val; + break; + + case 2: + *(u16 *)&trace_state->entry->fields[field->offset] = (u16)val; + break; + + case 4: + *(u32 *)&trace_state->entry->fields[field->offset] = (u32)val; + break; + + default: + trace_state->entry->fields[field->offset] = val; + break; + } + } out: return ret; } @@ -2223,9 +2260,7 @@ int synth_event_trace_end(struct synth_event_trace_state *trace_state) if (!trace_state) return -EINVAL; - trace_event_buffer_commit(&trace_state->fbuffer); - - ring_buffer_nest_end(trace_state->buffer); + __synth_event_trace_end(trace_state); return 0; } diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index d8264ebb9581..362cca52f5de 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1012,7 +1012,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...) { struct dynevent_arg arg; va_list args; - int ret; + int ret = 0; if (cmd->type != DYNEVENT_TYPE_KPROBE) return -EINVAL; |