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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
commit | dc50eab76b709d68175a358d6e23a5a3890764d3 (patch) | |
tree | c754d0390db060af0213ff994f0ac310e4cfd6e9 /kernel/trace/trace_events.c | |
parent | Adding debian version 6.6.15-2. (diff) | |
download | linux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip |
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kernel/trace/trace_events.c')
-rw-r--r-- | kernel/trace/trace_events.c | 333 |
1 files changed, 229 insertions, 104 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 82cb22ad6d..f29e815ca5 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -984,7 +984,7 @@ static void remove_subsystem(struct trace_subsystem_dir *dir) return; if (!--dir->nr_events) { - eventfs_remove(dir->ef); + eventfs_remove_dir(dir->ei); list_del(&dir->list); __put_system_dir(dir); } @@ -1013,7 +1013,7 @@ void event_file_put(struct trace_event_file *file) static void remove_event_file_dir(struct trace_event_file *file) { - eventfs_remove(file->ef); + eventfs_remove_dir(file->ei); list_del(&file->list); remove_subsystem(file->system); free_event_filter(file->filter); @@ -1188,7 +1188,7 @@ ftrace_event_write(struct file *file, const char __user *ubuf, if (!cnt) return 0; - ret = tracing_update_buffers(); + ret = tracing_update_buffers(tr); if (ret < 0) return ret; @@ -1419,18 +1419,20 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, if (ret) return ret; - ret = tracing_update_buffers(); - if (ret < 0) - return ret; - switch (val) { case 0: case 1: ret = -ENODEV; mutex_lock(&event_mutex); file = event_file_data(filp); - if (likely(file && !(file->flags & EVENT_FILE_FL_FREED))) + if (likely(file && !(file->flags & EVENT_FILE_FL_FREED))) { + ret = tracing_update_buffers(file->tr); + if (ret < 0) { + mutex_unlock(&event_mutex); + return ret; + } ret = ftrace_event_enable_disable(file, val); + } mutex_unlock(&event_mutex); break; @@ -1504,7 +1506,7 @@ system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, if (ret) return ret; - ret = tracing_update_buffers(); + ret = tracing_update_buffers(dir->tr); if (ret < 0) return ret; @@ -1978,7 +1980,7 @@ event_pid_write(struct file *filp, const char __user *ubuf, if (!cnt) return 0; - ret = tracing_update_buffers(); + ret = tracing_update_buffers(tr); if (ret < 0) return ret; @@ -2302,14 +2304,40 @@ create_new_subsystem(const char *name) return NULL; } -static struct eventfs_file * +static int system_callback(const char *name, umode_t *mode, void **data, + const struct file_operations **fops) +{ + if (strcmp(name, "filter") == 0) + *fops = &ftrace_subsystem_filter_fops; + + else if (strcmp(name, "enable") == 0) + *fops = &ftrace_system_enable_fops; + + else + return 0; + + *mode = TRACE_MODE_WRITE; + return 1; +} + +static struct eventfs_inode * event_subsystem_dir(struct trace_array *tr, const char *name, - struct trace_event_file *file, struct dentry *parent) + struct trace_event_file *file, struct eventfs_inode *parent) { struct event_subsystem *system, *iter; struct trace_subsystem_dir *dir; - struct eventfs_file *ef; - int res; + struct eventfs_inode *ei; + int nr_entries; + static struct eventfs_entry system_entries[] = { + { + .name = "filter", + .callback = system_callback, + }, + { + .name = "enable", + .callback = system_callback, + } + }; /* First see if we did not already create this dir */ list_for_each_entry(dir, &tr->systems, list) { @@ -2317,7 +2345,7 @@ event_subsystem_dir(struct trace_array *tr, const char *name, if (strcmp(system->name, name) == 0) { dir->nr_events++; file->system = dir; - return dir->ef; + return dir->ei; } } @@ -2341,39 +2369,29 @@ event_subsystem_dir(struct trace_array *tr, const char *name, } else __get_system(system); - ef = eventfs_add_subsystem_dir(name, parent); - if (IS_ERR(ef)) { + /* ftrace only has directories no files */ + if (strcmp(name, "ftrace") == 0) + nr_entries = 0; + else + nr_entries = ARRAY_SIZE(system_entries); + + ei = eventfs_create_dir(name, parent, system_entries, nr_entries, dir); + if (IS_ERR(ei)) { pr_warn("Failed to create system directory %s\n", name); __put_system(system); goto out_free; } - dir->ef = ef; + dir->ei = ei; dir->tr = tr; dir->ref_count = 1; dir->nr_events = 1; dir->subsystem = system; file->system = dir; - /* the ftrace system is special, do not create enable or filter files */ - if (strcmp(name, "ftrace") != 0) { - - res = eventfs_add_file("filter", TRACE_MODE_WRITE, - dir->ef, dir, - &ftrace_subsystem_filter_fops); - if (res) { - kfree(system->filter); - system->filter = NULL; - pr_warn("Could not create tracefs '%s/filter' entry\n", name); - } - - eventfs_add_file("enable", TRACE_MODE_WRITE, dir->ef, dir, - &ftrace_system_enable_fops); - } - list_add(&dir->list, &tr->systems); - return dir->ef; + return dir->ei; out_free: kfree(dir); @@ -2422,15 +2440,134 @@ event_define_fields(struct trace_event_call *call) return ret; } +static int event_callback(const char *name, umode_t *mode, void **data, + const struct file_operations **fops) +{ + struct trace_event_file *file = *data; + struct trace_event_call *call = file->event_call; + + if (strcmp(name, "format") == 0) { + *mode = TRACE_MODE_READ; + *fops = &ftrace_event_format_fops; + *data = call; + return 1; + } + + /* + * Only event directories that can be enabled should have + * triggers or filters, with the exception of the "print" + * event that can have a "trigger" file. + */ + if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { + if (call->class->reg && strcmp(name, "enable") == 0) { + *mode = TRACE_MODE_WRITE; + *fops = &ftrace_enable_fops; + return 1; + } + + if (strcmp(name, "filter") == 0) { + *mode = TRACE_MODE_WRITE; + *fops = &ftrace_event_filter_fops; + return 1; + } + } + + if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) || + strcmp(trace_event_name(call), "print") == 0) { + if (strcmp(name, "trigger") == 0) { + *mode = TRACE_MODE_WRITE; + *fops = &event_trigger_fops; + return 1; + } + } + +#ifdef CONFIG_PERF_EVENTS + if (call->event.type && call->class->reg && + strcmp(name, "id") == 0) { + *mode = TRACE_MODE_READ; + *data = (void *)(long)call->event.type; + *fops = &ftrace_event_id_fops; + return 1; + } +#endif + +#ifdef CONFIG_HIST_TRIGGERS + if (strcmp(name, "hist") == 0) { + *mode = TRACE_MODE_READ; + *fops = &event_hist_fops; + return 1; + } +#endif +#ifdef CONFIG_HIST_TRIGGERS_DEBUG + if (strcmp(name, "hist_debug") == 0) { + *mode = TRACE_MODE_READ; + *fops = &event_hist_debug_fops; + return 1; + } +#endif +#ifdef CONFIG_TRACE_EVENT_INJECT + if (call->event.type && call->class->reg && + strcmp(name, "inject") == 0) { + *mode = 0200; + *fops = &event_inject_fops; + return 1; + } +#endif + return 0; +} + static int -event_create_dir(struct dentry *parent, struct trace_event_file *file) +event_create_dir(struct eventfs_inode *parent, struct trace_event_file *file) { struct trace_event_call *call = file->event_call; - struct eventfs_file *ef_subsystem = NULL; struct trace_array *tr = file->tr; - struct eventfs_file *ef; + struct eventfs_inode *e_events; + struct eventfs_inode *ei; const char *name; + int nr_entries; int ret; + static struct eventfs_entry event_entries[] = { + { + .name = "enable", + .callback = event_callback, + }, + { + .name = "filter", + .callback = event_callback, + }, + { + .name = "trigger", + .callback = event_callback, + }, + { + .name = "format", + .callback = event_callback, + }, +#ifdef CONFIG_PERF_EVENTS + { + .name = "id", + .callback = event_callback, + }, +#endif +#ifdef CONFIG_HIST_TRIGGERS + { + .name = "hist", + .callback = event_callback, + }, +#endif +#ifdef CONFIG_HIST_TRIGGERS_DEBUG + { + .name = "hist_debug", + .callback = event_callback, + }, +#endif +#ifdef CONFIG_TRACE_EVENT_INJECT + { + .name = "inject", + .callback = event_callback, + }, +#endif + }; /* * If the trace point header did not define TRACE_SYSTEM @@ -2440,29 +2577,20 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file) if (WARN_ON_ONCE(strcmp(call->class->system, TRACE_SYSTEM) == 0)) return -ENODEV; - ef_subsystem = event_subsystem_dir(tr, call->class->system, file, parent); - if (!ef_subsystem) + e_events = event_subsystem_dir(tr, call->class->system, file, parent); + if (!e_events) return -ENOMEM; + nr_entries = ARRAY_SIZE(event_entries); + name = trace_event_name(call); - ef = eventfs_add_dir(name, ef_subsystem); - if (IS_ERR(ef)) { + ei = eventfs_create_dir(name, e_events, event_entries, nr_entries, file); + if (IS_ERR(ei)) { pr_warn("Could not create tracefs '%s' directory\n", name); return -1; } - file->ef = ef; - - if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) - eventfs_add_file("enable", TRACE_MODE_WRITE, file->ef, file, - &ftrace_enable_fops); - -#ifdef CONFIG_PERF_EVENTS - if (call->event.type && call->class->reg) - eventfs_add_file("id", TRACE_MODE_READ, file->ef, - (void *)(long)call->event.type, - &ftrace_event_id_fops); -#endif + file->ei = ei; ret = event_define_fields(call); if (ret < 0) { @@ -2470,35 +2598,6 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file) return ret; } - /* - * Only event directories that can be enabled should have - * triggers or filters. - */ - if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { - eventfs_add_file("filter", TRACE_MODE_WRITE, file->ef, - file, &ftrace_event_filter_fops); - - eventfs_add_file("trigger", TRACE_MODE_WRITE, file->ef, - file, &event_trigger_fops); - } - -#ifdef CONFIG_HIST_TRIGGERS - eventfs_add_file("hist", TRACE_MODE_READ, file->ef, file, - &event_hist_fops); -#endif -#ifdef CONFIG_HIST_TRIGGERS_DEBUG - eventfs_add_file("hist_debug", TRACE_MODE_READ, file->ef, file, - &event_hist_debug_fops); -#endif - eventfs_add_file("format", TRACE_MODE_READ, file->ef, call, - &ftrace_event_format_fops); - -#ifdef CONFIG_TRACE_EVENT_INJECT - if (call->event.type && call->class->reg) - eventfs_add_file("inject", 0200, file->ef, file, - &event_inject_fops); -#endif - return 0; } @@ -2847,7 +2946,7 @@ static __init int setup_trace_triggers(char *str) int i; strscpy(bootup_trigger_buf, str, COMMAND_LINE_SIZE); - ring_buffer_expanded = true; + trace_set_ring_buffer_expanded(NULL); disable_tracing_selftest("running event triggers"); buf = bootup_trigger_buf; @@ -3637,37 +3736,72 @@ static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; static __init int setup_trace_event(char *str) { strscpy(bootup_event_buf, str, COMMAND_LINE_SIZE); - ring_buffer_expanded = true; + trace_set_ring_buffer_expanded(NULL); disable_tracing_selftest("running event tracing"); return 1; } __setup("trace_event=", setup_trace_event); +static int events_callback(const char *name, umode_t *mode, void **data, + const struct file_operations **fops) +{ + if (strcmp(name, "enable") == 0) { + *mode = TRACE_MODE_WRITE; + *fops = &ftrace_tr_enable_fops; + return 1; + } + + if (strcmp(name, "header_page") == 0) + *data = ring_buffer_print_page_header; + + else if (strcmp(name, "header_event") == 0) + *data = ring_buffer_print_entry_header; + + else + return 0; + + *mode = TRACE_MODE_READ; + *fops = &ftrace_show_header_fops; + return 1; +} + /* Expects to have event_mutex held when called */ static int create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) { - struct dentry *d_events; + struct eventfs_inode *e_events; struct dentry *entry; - int error = 0; + int nr_entries; + static struct eventfs_entry events_entries[] = { + { + .name = "enable", + .callback = events_callback, + }, + { + .name = "header_page", + .callback = events_callback, + }, + { + .name = "header_event", + .callback = events_callback, + }, + }; entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent, tr, &ftrace_set_event_fops); if (!entry) return -ENOMEM; - d_events = eventfs_create_events_dir("events", parent); - if (IS_ERR(d_events)) { + nr_entries = ARRAY_SIZE(events_entries); + + e_events = eventfs_create_events_dir("events", parent, events_entries, + nr_entries, tr); + if (IS_ERR(e_events)) { pr_warn("Could not create tracefs 'events' directory\n"); return -ENOMEM; } - error = eventfs_add_events_file("enable", TRACE_MODE_WRITE, d_events, - tr, &ftrace_tr_enable_fops); - if (error) - return -ENOMEM; - /* There are not as crucial, just warn if they are not created */ trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent, @@ -3677,16 +3811,7 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) TRACE_MODE_WRITE, parent, tr, &ftrace_set_event_notrace_pid_fops); - /* ring buffer internal formats */ - eventfs_add_events_file("header_page", TRACE_MODE_READ, d_events, - ring_buffer_print_page_header, - &ftrace_show_header_fops); - - eventfs_add_events_file("header_event", TRACE_MODE_READ, d_events, - ring_buffer_print_entry_header, - &ftrace_show_header_fops); - - tr->event_dir = d_events; + tr->event_dir = e_events; return 0; } |