diff options
| -rw-r--r-- | include/linux/tracepoint.h | 3 | ||||
| -rw-r--r-- | include/trace/irq_event_types.h | 24 | ||||
| -rw-r--r-- | include/trace/sched_event_types.h | 124 | ||||
| -rw-r--r-- | include/trace/trace_event_types.h | 4 | ||||
| -rw-r--r-- | include/trace/trace_events.h | 4 | ||||
| -rw-r--r-- | kernel/trace/events.c | 20 | ||||
| -rw-r--r-- | kernel/trace/trace.c | 14 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 32 | ||||
| -rw-r--r-- | kernel/trace/trace_events.c | 294 | ||||
| -rw-r--r-- | kernel/trace/trace_events.h | 55 | ||||
| -rw-r--r-- | kernel/trace/trace_events_stage_1.h | 34 | ||||
| -rw-r--r-- | kernel/trace/trace_events_stage_2.h | 72 | ||||
| -rw-r--r-- | kernel/trace/trace_events_stage_3.h | 219 |
13 files changed, 776 insertions, 123 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 62d13391a240..152b2f03fb86 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -157,4 +157,7 @@ static inline void tracepoint_synchronize_unregister(void) #define TRACE_FORMAT(name, proto, args, fmt) \ DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) +#define TRACE_EVENT_FORMAT(name, proto, args, fmt, struct, tpfmt) \ + TRACE_FORMAT(name, PARAMS(proto), PARAMS(args), PARAMS(fmt)) + #endif diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h index 5d0919fdd2d4..65850bc5ea06 100644 --- a/include/trace/irq_event_types.h +++ b/include/trace/irq_event_types.h @@ -5,13 +5,29 @@ # error Unless you know what you are doing. #endif -TRACE_FORMAT(irq_handler_entry, +#undef TRACE_SYSTEM +#define TRACE_SYSTEM irq + +TRACE_EVENT_FORMAT(irq_handler_entry, TPPROTO(int irq, struct irqaction *action), TPARGS(irq, action), - TPFMT("irq=%d handler=%s", irq, action->name)); + TPFMT("irq=%d handler=%s", irq, action->name), + TRACE_STRUCT( + TRACE_FIELD(int, irq, irq) + ), + TPRAWFMT("irq %d") + ); -TRACE_FORMAT(irq_handler_exit, +TRACE_EVENT_FORMAT(irq_handler_exit, TPPROTO(int irq, struct irqaction *action, int ret), TPARGS(irq, action, ret), TPFMT("irq=%d handler=%s return=%s", - irq, action->name, ret ? "handled" : "unhandled")); + irq, action->name, ret ? "handled" : "unhandled"), + TRACE_STRUCT( + TRACE_FIELD(int, irq, irq) + TRACE_FIELD(int, ret, ret) + ), + TPRAWFMT("irq %d ret %d") + ); + +#undef TRACE_SYSTEM diff --git a/include/trace/sched_event_types.h b/include/trace/sched_event_types.h index a3d3d66a51c8..ba059c10b58a 100644 --- a/include/trace/sched_event_types.h +++ b/include/trace/sched_event_types.h @@ -1,72 +1,146 @@ /* use <trace/sched.h> instead */ -#ifndef TRACE_FORMAT +#ifndef TRACE_EVENT_FORMAT # error Do not include this file directly. # error Unless you know what you are doing. #endif -TRACE_FORMAT(sched_kthread_stop, +#undef TRACE_SYSTEM +#define TRACE_SYSTEM sched + +TRACE_EVENT_FORMAT(sched_kthread_stop, TPPROTO(struct task_struct *t), TPARGS(t), - TPFMT("task %s:%d", t->comm, t->pid)); + TPFMT("task %s:%d", t->comm, t->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, t->pid) + ), + TPRAWFMT("task %d") + ); -TRACE_FORMAT(sched_kthread_stop_ret, +TRACE_EVENT_FORMAT(sched_kthread_stop_ret, TPPROTO(int ret), TPARGS(ret), - TPFMT("ret=%d", ret)); + TPFMT("ret=%d", ret), + TRACE_STRUCT( + TRACE_FIELD(int, ret, ret) + ), + TPRAWFMT("ret=%d") + ); -TRACE_FORMAT(sched_wait_task, +TRACE_EVENT_FORMAT(sched_wait_task, TPPROTO(struct rq *rq, struct task_struct *p), TPARGS(rq, p), - TPFMT("task %s:%d", p->comm, p->pid)); + TPFMT("task %s:%d", p->comm, p->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + ), + TPRAWFMT("task %d") + ); -TRACE_FORMAT(sched_wakeup, +TRACE_EVENT_FORMAT(sched_wakeup, TPPROTO(struct rq *rq, struct task_struct *p, int success), TPARGS(rq, p, success), TPFMT("task %s:%d %s", - p->comm, p->pid, success?"succeeded":"failed")); + p->comm, p->pid, success ? "succeeded" : "failed"), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + TRACE_FIELD(int, success, success) + ), + TPRAWFMT("task %d success=%d") + ); -TRACE_FORMAT(sched_wakeup_new, +TRACE_EVENT_FORMAT(sched_wakeup_new, TPPROTO(struct rq *rq, struct task_struct *p, int success), TPARGS(rq, p, success), TPFMT("task %s:%d", - p->comm, p->pid, success?"succeeded":"failed")); + p->comm, p->pid, success ? "succeeded" : "failed"), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + TRACE_FIELD(int, success, success) + ), + TPRAWFMT("task %d success=%d") + ); -TRACE_FORMAT(sched_switch, +TRACE_EVENT_FORMAT(sched_switch, TPPROTO(struct rq *rq, struct task_struct *prev, struct task_struct *next), TPARGS(rq, prev, next), TPFMT("task %s:%d ==> %s:%d", - prev->comm, prev->pid, next->comm, next->pid)); + prev->comm, prev->pid, next->comm, next->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, prev_pid, prev->pid) + TRACE_FIELD(int, prev_prio, prev->prio) + TRACE_FIELD(pid_t, next_pid, next->pid) + TRACE_FIELD(int, next_prio, next->prio) + ), + TPRAWFMT("prev %d:%d ==> next %d:%d") + ); -TRACE_FORMAT(sched_migrate_task, +TRACE_EVENT_FORMAT(sched_migrate_task, TPPROTO(struct task_struct *p, int orig_cpu, int dest_cpu), TPARGS(p, orig_cpu, dest_cpu), TPFMT("task %s:%d from: %d to: %d", - p->comm, p->pid, orig_cpu, dest_cpu)); + p->comm, p->pid, orig_cpu, dest_cpu), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + TRACE_FIELD(int, orig_cpu, orig_cpu) + TRACE_FIELD(int, dest_cpu, dest_cpu) + ), + TPRAWFMT("task %d from: %d to: %d") + ); -TRACE_FORMAT(sched_process_free, +TRACE_EVENT_FORMAT(sched_process_free, TPPROTO(struct task_struct *p), TPARGS(p), - TPFMT("task %s:%d", p->comm, p->pid)); + TPFMT("task %s:%d", p->comm, p->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + ), + TPRAWFMT("task %d") + ); -TRACE_FORMAT(sched_process_exit, +TRACE_EVENT_FORMAT(sched_process_exit, TPPROTO(struct task_struct *p), TPARGS(p), - TPFMT("task %s:%d", p->comm, p->pid)); + TPFMT("task %s:%d", p->comm, p->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, p->pid) + ), + TPRAWFMT("task %d") + ); -TRACE_FORMAT(sched_process_wait, +TRACE_EVENT_FORMAT(sched_process_wait, TPPROTO(struct pid *pid), TPARGS(pid), - TPFMT("pid %d", pid)); + TPFMT("pid %d", pid_nr(pid)), + TRACE_STRUCT( + TRACE_FIELD(pid_t, pid, pid_nr(pid)) + ), + TPRAWFMT("task %d") + ); -TRACE_FORMAT(sched_process_fork, +TRACE_EVENT_FORMAT(sched_process_fork, TPPROTO(struct task_struct *parent, struct task_struct *child), TPARGS(parent, child), TPFMT("parent %s:%d child %s:%d", - parent->comm, parent->pid, child->comm, child->pid)); + parent->comm, parent->pid, child->comm, child->pid), + TRACE_STRUCT( + TRACE_FIELD(pid_t, parent, parent->pid) + TRACE_FIELD(pid_t, child, child->pid) + ), + TPRAWFMT("parent %d child %d") + ); -TRACE_FORMAT(sched_signal_send, +TRACE_EVENT_FORMAT(sched_signal_send, TPPROTO(int sig, struct task_struct *p), TPARGS(sig, p), - TPFMT("sig: %d task %s:%d", sig, p->comm, p->pid)); + TPFMT("sig: %d task %s:%d", sig, p->comm, p->pid), + TRACE_STRUCT( + TRACE_FIELD(int, sig, sig) + TRACE_FIELD(pid_t, pid, p->pid) + ), + TPRAWFMT("sig: %d task %d") + ); + +#undef TRACE_SYSTEM diff --git a/include/trace/trace_event_types.h b/include/trace/trace_event_types.h new file mode 100644 index 000000000000..33c8ed5ccb6c --- /dev/null +++ b/include/trace/trace_event_types.h @@ -0,0 +1,4 @@ +/* trace/<type>_event_types.h here */ + +#include <trace/sched_event_types.h> +#include <trace/irq_event_types.h> diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h new file mode 100644 index 000000000000..ea2ef2051762 --- /dev/null +++ b/include/trace/trace_events.h @@ -0,0 +1,4 @@ +/* trace/<type>.h here */ + +#include <trace/sched.h> +#include <trace/irq.h> diff --git a/kernel/trace/events.c b/kernel/trace/events.c index 3c75623893cc..f2509cbaacea 100644 --- a/kernel/trace/events.c +++ b/kernel/trace/events.c @@ -1,15 +1,17 @@ /* * This is the place to register all trace points as events. - * Include the trace/<type>.h at the top. - * Include the trace/<type>_event_types.h at the bottom. */ -/* trace/<type>.h here */ -#include <trace/sched.h> -#include <trace/irq.h> +/* someday this needs to go in a generic header */ +#define __STR(x) #x +#define STR(x) __STR(x) -#include "trace_events.h" +#include <trace/trace_events.h> -/* trace/<type>_event_types.h here */ -#include <trace/sched_event_types.h> -#include <trace/irq_event_types.h> +#include "trace_output.h" + +#include "trace_events_stage_1.h" +#include "trace_events_stage_2.h" +#include "trace_events_stage_3.h" + +#include <trace/trace_event_types.h> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 9c5987aca74b..c5e39cd7310d 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -846,6 +846,20 @@ void trace_buffer_unlock_commit(struct trace_array *tr, trace_wake_up(); } +struct ring_buffer_event * +trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, + unsigned long flags, int pc) +{ + return trace_buffer_lock_reserve(&global_trace, + type, len, flags, pc); +} + +void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, + unsigned long flags, int pc) +{ + return trace_buffer_unlock_commit(&global_trace, event, flags, pc); +} + void trace_function(struct trace_array *tr, unsigned long ip, unsigned long parent_ip, unsigned long flags, diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 632191770aac..f6fa0b9f83a8 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -442,6 +442,12 @@ void trace_buffer_unlock_commit(struct trace_array *tr, struct ring_buffer_event *event, unsigned long flags, int pc); +struct ring_buffer_event * +trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, + unsigned long flags, int pc); +void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, + unsigned long flags, int pc); + struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data); @@ -720,4 +726,30 @@ static inline void trace_branch_disable(void) } #endif /* CONFIG_BRANCH_TRACER */ +/* trace event type bit fields, not numeric */ +enum { + TRACE_EVENT_TYPE_PRINTF = 1, + TRACE_EVENT_TYPE_RAW = 2, +}; + +struct ftrace_event_call { + char *name; + char *system; + struct dentry *dir; + int enabled; + int (*regfunc)(void); + void (*unregfunc)(void); + int id; + struct dentry *raw_dir; + int raw_enabled; + int type; + int (*raw_init)(void); + int (*raw_reg)(void); + void (*raw_unreg)(void); +}; + +void event_trace_printk(unsigned long ip, const char *fmt, ...); +extern struct ftrace_event_call __start_ftrace_events[]; +extern struct ftrace_event_call __stop_ftrace_events[]; + #endif /* _LINUX_KERNEL_TRACE_H */ diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 3bcb9df93342..1d07f800a9ce 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -10,7 +10,9 @@ #include <linux/module.h> #include <linux/ctype.h> -#include "trace_events.h" +#include "trace.h" + +#define TRACE_SYSTEM "TRACE_SYSTEM" #define events_for_each(event) \ for (event = __start_ftrace_events; \ @@ -42,35 +44,87 @@ static void ftrace_clear_events(void) } } +static void ftrace_event_enable_disable(struct ftrace_event_call *call, + int enable) +{ + + switch (enable) { + case 0: + if (call->enabled) { + call->enabled = 0; + call->unregfunc(); + } + if (call->raw_enabled) { + call->raw_enabled = 0; + call->raw_unreg(); + } + break; + case 1: + if (!call->enabled && + (call->type & TRACE_EVENT_TYPE_PRINTF)) { + call->enabled = 1; + call->regfunc(); + } + if (!call->raw_enabled && + (call->type & TRACE_EVENT_TYPE_RAW)) { + call->raw_enabled = 1; + call->raw_reg(); + } + break; + } +} + static int ftrace_set_clr_event(char *buf, int set) { struct ftrace_event_call *call = __start_ftrace_events; - + char *event = NULL, *sub = NULL, *match; + int ret = -EINVAL; + + /* + * The buf format can be <subsystem>:<event-name> + * *:<event-name> means any event by that name. + * :<event-name> is the same. + * + * <subsystem>:* means all events in that subsystem + * <subsystem>: means the same. + * + * <name> (no ':') means all events in a subsystem with + * the name <name> or any event that matches <name> + */ + + match = strsep(&buf, ":"); + if (buf) { + sub = match; + event = buf; + match = NULL; + + if (!strlen(sub) || strcmp(sub, "*") == 0) + sub = NULL; + if (!strlen(event) || strcmp(event, "*") == 0) + event = NULL; + } events_for_each(call) { if (!call->name) continue; - if (strcmp(buf, call->name) != 0) + if (match && + strcmp(match, call->name) != 0 && + strcmp(match, call->system) != 0) continue; - if (set) { - /* Already set? */ - if (call->enabled) - return 0; - call->enabled = 1; - call->regfunc(); - } else { - /* Already cleared? */ - if (!call->enabled) - return 0; - call->enabled = 0; - call->unregfunc(); - } - return 0; + if (sub && strcmp(sub, call->system) != 0) + continue; + + if (event && strcmp(event, call->name) != 0) + continue; + + ftrace_event_enable_disable(call, set); + + ret = 0; } - return -EINVAL; + return ret; } /* 128 should be much more than enough */ @@ -200,6 +254,8 @@ static int t_show(struct seq_file *m, void *v) { struct ftrace_event_call *call = v; + if (strcmp(call->system, TRACE_SYSTEM) != 0) + seq_printf(m, "%s:", call->system); seq_printf(m, "%s\n", call->name); return 0; @@ -236,7 +292,7 @@ event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, struct ftrace_event_call *call = filp->private_data; char *buf; - if (call->enabled) + if (call->enabled || call->raw_enabled) buf = "1\n"; else buf = "0\n"; @@ -267,18 +323,8 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, switch (val) { case 0: - if (!call->enabled) - break; - - call->enabled = 0; - call->unregfunc(); - break; case 1: - if (call->enabled) - break; - - call->enabled = 1; - call->regfunc(); + ftrace_event_enable_disable(call, val); break; default: @@ -290,6 +336,107 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, return cnt; } +static ssize_t +event_type_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_call *call = filp->private_data; + char buf[16]; + int r = 0; + + if (call->type & TRACE_EVENT_TYPE_PRINTF) + r += sprintf(buf, "printf\n"); + + if (call->type & TRACE_EVENT_TYPE_RAW) + r += sprintf(buf+r, "raw\n"); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +event_type_write(struct file *filp, const char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_call *call = filp->private_data; + char buf[64]; + + /* + * If there's only one type, we can't change it. + * And currently we always have printf type, and we + * may or may not have raw type. + * + * This is a redundant check, the file should be read + * only if this is the case anyway. + */ + + if (!call->raw_init) + return -EPERM; + + if (cnt >= sizeof(buf)) + return -EINVAL; + + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + + if (!strncmp(buf, "printf", 6) && + (!buf[6] || isspace(buf[6]))) { + + call->type = TRACE_EVENT_TYPE_PRINTF; + + /* + * If raw enabled, the disable it and enable + * printf type. + */ + if (call->raw_enabled) { + call->raw_enabled = 0; + call->raw_unreg(); + + call->enabled = 1; + call->regfunc(); + } + + } else if (!strncmp(buf, "raw", 3) && + (!buf[3] || isspace(buf[3]))) { + + call->type = TRACE_EVENT_TYPE_RAW; + + /* + * If printf enabled, the disable it and enable + * raw type. + */ + if (call->enabled) { + call->enabled = 0; + call->unregfunc(); + + call->raw_enabled = 1; + call->raw_reg(); + } + } else + return -EINVAL; + + *ppos += cnt; + + return cnt; +} + +static ssize_t +event_available_types_read(struct file *filp, char __user *ubuf, size_t cnt, + loff_t *ppos) +{ + struct ftrace_event_call *call = filp->private_data; + char buf[16]; + int r = 0; + + r += sprintf(buf, "printf\n"); + + if (call->raw_init) + r += sprintf(buf+r, "raw\n"); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + static const struct seq_operations show_event_seq_ops = { .start = t_start, .next = t_next, @@ -325,6 +472,17 @@ static const struct file_operations ftrace_enable_fops = { .write = event_enable_write, }; +static const struct file_operations ftrace_type_fops = { + .open = tracing_open_generic, + .read = event_type_read, + .write = event_type_write, +}; + +static const struct file_operations ftrace_available_types_fops = { + .open = tracing_open_generic, + .read = event_available_types_read, +}; + static struct dentry *event_trace_events_dir(void) { static struct dentry *d_tracer; @@ -345,10 +503,71 @@ static struct dentry *event_trace_events_dir(void) return d_events; } +struct event_subsystem { + struct list_head list; + const char *name; + struct dentry *entry; +}; + +static LIST_HEAD(event_subsystems); + +static struct dentry * +event_subsystem_dir(const char *name, struct dentry *d_events) +{ + struct event_subsystem *system; + + /* First see if we did not already create this dir */ + list_for_each_entry(system, &event_subsystems, list) { + if (strcmp(system->name, name) == 0) + return system->entry; + } + + /* need to create new entry */ + system = kmalloc(sizeof(*system), GFP_KERNEL); + if (!system) { + pr_warning("No memory to create event subsystem %s\n", + name); + return d_events; + } + + system->entry = debugfs_create_dir(name, d_events); + if (!system->entry) { + pr_warning("Could not create event subsystem %s\n", + name); + kfree(system); + return d_events; + } + + system->name = name; + list_add(&system->list, &event_subsystems); + + return system->entry; +} + static int event_create_dir(struct ftrace_event_call *call, struct dentry *d_events) { struct dentry *entry; + int ret; + + /* + * If the trace point header did not define TRACE_SYSTEM + * then the system would be called "TRACE_SYSTEM". + */ + if (strcmp(call->system, "TRACE_SYSTEM") != 0) + d_events = event_subsystem_dir(call->system, d_events); + + if (call->raw_init) { + ret = call->raw_init(); + if (ret < 0) { + pr_warning("Could not initialize trace point" + " events/%s\n", call->name); + return ret; + } + } + + /* default the output to printf */ + call->type = TRACE_EVENT_TYPE_PRINTF; call->dir = debugfs_create_dir(call->name, d_events); if (!call->dir) { @@ -363,6 +582,21 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events) pr_warning("Could not create debugfs " "'%s/enable' entry\n", call->name); + /* Only let type be writable, if we can change it */ + entry = debugfs_create_file("type", + call->raw_init ? 0644 : 0444, + call->dir, call, + &ftrace_type_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'%s/type' entry\n", call->name); + + entry = debugfs_create_file("available_types", 0444, call->dir, call, + &ftrace_available_types_fops); + if (!entry) + pr_warning("Could not create debugfs " + "'%s/type' available_types\n", call->name); + return 0; } diff --git a/kernel/trace/trace_events.h b/kernel/trace/trace_events.h deleted file mode 100644 index deb95e5006c8..000000000000 --- a/kernel/trace/trace_events.h +++ /dev/null @@ -1,55 +0,0 @@ -#ifndef _LINUX_KERNEL_TRACE_EVENTS_H -#define _LINUX_KERNEL_TRACE_EVENTS_H - -#include <linux/debugfs.h> -#include <linux/ftrace.h> -#include "trace.h" - -struct ftrace_event_call { - char *name; - struct dentry *dir; - int enabled; - int (*regfunc)(void); - void (*unregfunc)(void); -}; - - -#undef TPFMT -#define TPFMT(fmt, args...) fmt "\n", ##args - -#undef TRACE_FORMAT -#define TRACE_FORMAT(call, proto, args, fmt) \ -static void ftrace_event_##call(proto) \ -{ \ - event_trace_printk(_RET_IP_, "(" #call ") " fmt); \ -} \ - \ -static int ftrace_reg_event_##call(void) \ -{ \ - int ret; \ - \ - ret = register_trace_##call(ftrace_event_##call); \ - if (!ret) \ - pr_info("event trace: Could not activate trace point " \ - "probe to " #call); \ - return ret; \ -} \ - \ -static void ftrace_unreg_event_##call(void) \ -{ \ - unregister_trace_##call(ftrace_event_##call); \ -} \ - \ -static struct ftrace_event_call __used \ -__attribute__((__aligned__(4))) \ -__attribute__((section("_ftrace_events"))) event_##call = { \ - .name = #call, \ - .regfunc = ftrace_reg_event_##call, \ - .unregfunc = ftrace_unreg_event_##call, \ -} - -void event_trace_printk(unsigned long ip, const char *fmt, ...); -extern struct ftrace_event_call __start_ftrace_events[]; -extern struct ftrace_event_call __stop_ftrace_events[]; - -#endif /* _LINUX_KERNEL_TRACE_EVENTS_H */ diff --git a/kernel/trace/trace_events_stage_1.h b/kernel/trace/trace_events_stage_1.h new file mode 100644 index 000000000000..fd3bf9382d37 --- /dev/null +++ b/kernel/trace/trace_events_stage_1.h @@ -0,0 +1,34 @@ +/* + * Stage 1 of the trace events. + * + * Override the macros in <trace/trace_event_types.h> to include the following: + * + * struct ftrace_raw_<call> { + * struct trace_entry ent; + * <type> <item>; + * [...] + * }; + * + * The <type> <item> is created by the TRACE_FIELD(type, item, assign) + * macro. We simply do "type item;", and that will create the fields + * in the structure. + */ + +#undef TRACE_FORMAT +#define TRACE_FORMAT(call, proto, args, fmt) + +#undef TRACE_EVENT_FORMAT +#define TRACE_EVENT_FORMAT(name, proto, args, fmt, tstruct, tpfmt) \ + struct ftrace_raw_##name { \ + struct trace_entry ent; \ + tstruct \ + }; \ + static struct ftrace_event_call event_##name + +#undef TRACE_STRUCT +#define TRACE_STRUCT(args...) args + +#define TRACE_FIELD(type, item, assign) \ + type item; + +#include <trace/trace_event_types.h> diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h new file mode 100644 index 000000000000..3eaaef5f19e1 --- /dev/null +++ b/kernel/trace/trace_events_stage_2.h @@ -0,0 +1,72 @@ +/* + * Stage 2 of the trace events. + * + * Override the macros in <trace/trace_event_types.h> to include the following: + * + * enum print_line_t + * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags) + * { + * struct trace_seq *s = &iter->seq; + * struct ftrace_raw_<call> *field; <-- defined in stage 1 + * struct trace_entry *entry; + * int ret; + * + * entry = iter->ent; + * + * if (entry->type != event_<call>.id) { + * WARN_ON_ONCE(1); + * return TRACE_TYPE_UNHANDLED; + * } + * + * field = (typeof(field))entry; + * + * ret = trace_seq_printf(s, <TPRAWFMT> "%s", <ARGS> "\n"); + * if (!ret) + * return TRACE_TYPE_PARTIAL_LINE; + * + * return TRACE_TYPE_HANDLED; + * } + * + * This is the method used to print the raw event to the trace + * output format. Note, this is not needed if the data is read + * in binary. + */ + +#undef TRACE_STRUCT +#define TRACE_STRUCT(args...) args + +#undef TRACE_FIELD +#define TRACE_FIELD(type, item, assign) \ + field->item, + + +#undef TPRAWFMT +#define TPRAWFMT(args...) args + +#undef TRACE_EVENT_FORMAT +#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \ +enum print_line_t \ +ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \ +{ \ + struct trace_seq *s = &iter->seq; \ + struct ftrace_raw_##call *field; \ + struct trace_entry *entry; \ + int ret; \ + \ + entry = iter->ent; \ + \ + if (entry->type != event_##call.id) { \ + WARN_ON_ONCE(1); \ + return TRACE_TYPE_UNHANDLED; \ + } \ + \ + field = (typeof(field))entry; \ + \ + ret = trace_seq_printf(s, tpfmt "%s", tstruct "\n"); \ + if (!ret) \ + return TRACE_TYPE_PARTIAL_LINE; \ + \ + return TRACE_TYPE_HANDLED; \ +} + +#include <trace/trace_event_types.h> diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h new file mode 100644 index 000000000000..7a161c49deb4 --- /dev/null +++ b/kernel/trace/trace_events_stage_3.h @@ -0,0 +1,219 @@ +/* + * Stage 3 of the trace events. + * + * Override the macros in <trace/trace_event_types.h> to include the following: + * + * static void ftrace_event_<call>(proto) + * { + * event_trace_printk(_RET_IP_, "(<call>) " <fmt>); + * } + * + * static int ftrace_reg_event_<call>(void) + * { + * int ret; + * + * ret = register_trace_<call>(ftrace_event_<call>); + * if (!ret) + * pr_info("event trace: Could not activate trace point " + * "probe to <call>"); + * return ret; + * } + * + * static void ftrace_unreg_event_<call>(void) + * { + * unregister_trace_<call>(ftrace_event_<call>); + * } + * + * For those macros defined with TRACE_FORMAT: + * + * static struct ftrace_event_call __used + * __attribute__((__aligned__(4))) + * __attribute__((section("_ftrace_events"))) event_<call> = { + * .name = "<call>", + * .regfunc = ftrace_reg_event_<call>, + * .unregfunc = ftrace_unreg_event_<call>, + * } + * + * + * For those macros defined with TRACE_EVENT_FORMAT: + * + * static struct ftrace_event_call event_<call>; + * + * static void ftrace_raw_event_<call>(proto) + * { + * struct ring_buffer_event *event; + * struct ftrace_raw_<call> *entry; <-- defined in stage 1 + * unsigned long irq_flags; + * int pc; + * + * local_save_flags(irq_flags); + * pc = preempt_count(); + * + * event = trace_current_buffer_lock_reserve(event_<call>.id, + * sizeof(struct ftrace_raw_<call>), + * irq_flags, pc); + * if (!event) + * return; + * entry = ring_buffer_event_data(event); + * + * <tstruct>; <-- Here we assign the entries by the TRACE_FIELD. + * + * trace_current_buffer_unlock_commit(event, irq_flags, pc); + * } + * + * static int ftrace_raw_reg_event_<call>(void) + * { + * int ret; + * + * ret = register_trace_<call>(ftrace_raw_event_<call>); + * if (!ret) + * pr_info("event trace: Could not activate trace point " + * "probe to <call>"); + * return ret; + * } + * + * static void ftrace_unreg_event_<call>(void) + * { + * unregister_trace_<call>(ftrace_raw_event_<call>); + * } + * + * static struct trace_event ftrace_event_type_<call> = { + * .trace = ftrace_raw_output_<call>, <-- stage 2 + * }; + * + * static int ftrace_raw_init_event_<call>(void) + * { + * int id; + * + * id = register_ftrace_event(&ftrace_event_type_<call>); + * if (!id) + * return -ENODEV; + * event_<call>.id = id; + * return 0; + * } + * + * static struct ftrace_event_call __used + * __attribute__((__aligned__(4))) + * __attribute__((section("_ftrace_events"))) event_<call> = { + * .name = "<call>", + * .regfunc = ftrace_reg_event_<call>, + * .unregfunc = ftrace_unreg_event_<call>, + * .raw_init = ftrace_raw_init_event_<call>, + * .raw_reg = ftrace_raw_reg_event_<call>, + * .raw_unreg = ftrace_raw_unreg_event_<call>, + * } + * + */ + +#undef TPFMT +#define TPFMT(fmt, args...) fmt "\n", ##args + +#define _TRACE_FORMAT(call, proto, args, fmt) \ +static void ftrace_event_##call(proto) \ +{ \ + event_trace_printk(_RET_IP_, "(" #call ") " fmt); \ +} \ + \ +static int ftrace_reg_event_##call(void) \ +{ \ + int ret; \ + \ + ret = register_trace_##call(ftrace_event_##call); \ + if (!ret) \ + pr_info("event trace: Could not activate trace point " \ + "probe to " #call); \ + return ret; \ +} \ + \ +static void ftrace_unreg_event_##call(void) \ +{ \ + unregister_trace_##call(ftrace_event_##call); \ +} \ + + +#undef TRACE_FORMAT +#define TRACE_FORMAT(call, proto, args, fmt) \ +_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \ +static struct ftrace_event_call __used \ +__attribute__((__aligned__(4))) \ +__attribute__((section("_ftrace_events"))) event_##call = { \ + .name = #call, \ + .system = STR(TRACE_SYSTEM), \ + .regfunc = ftrace_reg_event_##call, \ + .unregfunc = ftrace_unreg_event_##call, \ +} + +#undef TRACE_FIELD +#define TRACE_FIELD(type, item, assign)\ + entry->item = assign; + +#undef TRACE_EVENT_FORMAT +#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \ +_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \ + \ +static struct ftrace_event_call event_##call; \ + \ +static void ftrace_raw_event_##call(proto) \ +{ \ + struct ring_buffer_event *event; \ + struct ftrace_raw_##call *entry; \ + unsigned long irq_flags; \ + int pc; \ + \ + local_save_flags(irq_flags); \ + pc = preempt_count(); \ + \ + event = trace_current_buffer_lock_reserve(event_##call.id, \ + sizeof(struct ftrace_raw_##call), \ + irq_flags, pc); \ + if (!event) \ + return; \ + entry = ring_buffer_event_data(event); \ + \ + tstruct; \ + \ + trace_current_buffer_unlock_commit(event, irq_flags, pc); \ +} \ + \ +static int ftrace_raw_reg_event_##call(void) \ +{ \ + int ret; \ + \ + ret = register_trace_##call(ftrace_raw_event_##call); \ + if (!ret) \ + pr_info("event trace: Could not activate trace point " \ + "probe to " #call); \ + return ret; \ +} \ + \ +static void ftrace_raw_unreg_event_##call(void) \ +{ \ + unregister_trace_##call(ftrace_raw_event_##call); \ +} \ + \ +static struct trace_event ftrace_event_type_##call = { \ + .trace = ftrace_raw_output_##call, \ +}; \ + \ +static int ftrace_raw_init_event_##call(void) \ +{ \ + int id; \ + \ + id = register_ftrace_event(&ftrace_event_type_##call); \ + if (!id) \ + return -ENODEV; \ + event_##call.id = id; \ + return 0; \ +} \ + \ +static struct ftrace_event_call __used \ +__attribute__((__aligned__(4))) \ +__attribute__((section("_ftrace_events"))) event_##call = { \ + .name = #call, \ + .system = STR(TRACE_SYSTEM), \ + .regfunc = ftrace_reg_event_##call, \ + .unregfunc = ftrace_unreg_event_##call, \ + .raw_init = ftrace_raw_init_event_##call, \ + .raw_reg = ftrace_raw_reg_event_##call, \ + .raw_unreg = ftrace_raw_unreg_event_##call, \ +} |
