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-rw-r--r--include/linux/ftrace_event.h23
-rw-r--r--include/linux/perf_event.h59
-rw-r--r--include/linux/syscalls.h24
-rw-r--r--include/trace/ftrace.h44
-rw-r--r--include/trace/syscall.h8
5 files changed, 111 insertions, 47 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 6b7c444ab8f6..c0f4b364c711 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -131,12 +131,12 @@ struct ftrace_event_call {
void *mod;
void *data;
- int profile_count;
- int (*profile_enable)(struct ftrace_event_call *);
- void (*profile_disable)(struct ftrace_event_call *);
+ int perf_refcount;
+ int (*perf_event_enable)(struct ftrace_event_call *);
+ void (*perf_event_disable)(struct ftrace_event_call *);
};
-#define FTRACE_MAX_PROFILE_SIZE 2048
+#define PERF_MAX_TRACE_SIZE 2048
#define MAX_FILTER_PRED 32
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
@@ -187,22 +187,25 @@ do { \
#ifdef CONFIG_PERF_EVENTS
struct perf_event;
-extern int ftrace_profile_enable(int event_id);
-extern void ftrace_profile_disable(int event_id);
+
+DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
+
+extern int perf_trace_enable(int event_id);
+extern void perf_trace_disable(int event_id);
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
char *filter_str);
extern void ftrace_profile_free_filter(struct perf_event *event);
extern void *
-ftrace_perf_buf_prepare(int size, unsigned short type, int *rctxp,
+perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
unsigned long *irq_flags);
static inline void
-ftrace_perf_buf_submit(void *raw_data, int size, int rctx, u64 addr,
- u64 count, unsigned long irq_flags)
+perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
+ u64 count, unsigned long irq_flags, struct pt_regs *regs)
{
struct trace_entry *entry = raw_data;
- perf_tp_event(entry->type, addr, count, raw_data, size);
+ perf_tp_event(entry->type, addr, count, raw_data, size, regs);
perf_swevent_put_recursion_context(rctx);
local_irq_restore(irq_flags);
}
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6f8cd7da1a01..95477038a72a 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -452,6 +452,8 @@ enum perf_callchain_context {
#include <linux/fs.h>
#include <linux/pid_namespace.h>
#include <linux/workqueue.h>
+#include <linux/ftrace.h>
+#include <linux/cpu.h>
#include <asm/atomic.h>
#define PERF_MAX_STACK_DEPTH 255
@@ -847,6 +849,44 @@ perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
__perf_sw_event(event_id, nr, nmi, regs, addr);
}
+extern void
+perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip);
+
+/*
+ * Take a snapshot of the regs. Skip ip and frame pointer to
+ * the nth caller. We only need a few of the regs:
+ * - ip for PERF_SAMPLE_IP
+ * - cs for user_mode() tests
+ * - bp for callchains
+ * - eflags, for future purposes, just in case
+ */
+static inline void perf_fetch_caller_regs(struct pt_regs *regs, int skip)
+{
+ unsigned long ip;
+
+ memset(regs, 0, sizeof(*regs));
+
+ switch (skip) {
+ case 1 :
+ ip = CALLER_ADDR0;
+ break;
+ case 2 :
+ ip = CALLER_ADDR1;
+ break;
+ case 3 :
+ ip = CALLER_ADDR2;
+ break;
+ case 4:
+ ip = CALLER_ADDR3;
+ break;
+ /* No need to support further for now */
+ default:
+ ip = 0;
+ }
+
+ return perf_arch_fetch_caller_regs(regs, ip, skip);
+}
+
extern void __perf_event_mmap(struct vm_area_struct *vma);
static inline void perf_event_mmap(struct vm_area_struct *vma)
@@ -880,7 +920,8 @@ static inline bool perf_paranoid_kernel(void)
}
extern void perf_event_init(void);
-extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record, int entry_size);
+extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
+ int entry_size, struct pt_regs *regs);
extern void perf_bp_event(struct perf_event *event, void *data);
#ifndef perf_misc_flags
@@ -936,5 +977,21 @@ static inline void perf_event_disable(struct perf_event *event) { }
#define perf_output_put(handle, x) \
perf_output_copy((handle), &(x), sizeof(x))
+/*
+ * This has to have a higher priority than migration_notifier in sched.c.
+ */
+#define perf_cpu_notifier(fn) \
+do { \
+ static struct notifier_block fn##_nb __cpuinitdata = \
+ { .notifier_call = fn, .priority = 20 }; \
+ fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
+ (void *)(unsigned long)smp_processor_id()); \
+ fn(&fn##_nb, (unsigned long)CPU_STARTING, \
+ (void *)(unsigned long)smp_processor_id()); \
+ fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
+ (void *)(unsigned long)smp_processor_id()); \
+ register_cpu_notifier(&fn##_nb); \
+} while (0)
+
#endif /* __KERNEL__ */
#endif /* _LINUX_PERF_EVENT_H */
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 44f2ad0e8825..f994ae58a002 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -105,18 +105,18 @@ struct perf_event_attr;
#ifdef CONFIG_PERF_EVENTS
-#define TRACE_SYS_ENTER_PROFILE_INIT(sname) \
- .profile_enable = prof_sysenter_enable, \
- .profile_disable = prof_sysenter_disable,
+#define TRACE_SYS_ENTER_PERF_INIT(sname) \
+ .perf_event_enable = perf_sysenter_enable, \
+ .perf_event_disable = perf_sysenter_disable,
-#define TRACE_SYS_EXIT_PROFILE_INIT(sname) \
- .profile_enable = prof_sysexit_enable, \
- .profile_disable = prof_sysexit_disable,
+#define TRACE_SYS_EXIT_PERF_INIT(sname) \
+ .perf_event_enable = perf_sysexit_enable, \
+ .perf_event_disable = perf_sysexit_disable,
#else
-#define TRACE_SYS_ENTER_PROFILE(sname)
-#define TRACE_SYS_ENTER_PROFILE_INIT(sname)
-#define TRACE_SYS_EXIT_PROFILE(sname)
-#define TRACE_SYS_EXIT_PROFILE_INIT(sname)
+#define TRACE_SYS_ENTER_PERF(sname)
+#define TRACE_SYS_ENTER_PERF_INIT(sname)
+#define TRACE_SYS_EXIT_PERF(sname)
+#define TRACE_SYS_EXIT_PERF_INIT(sname)
#endif /* CONFIG_PERF_EVENTS */
#ifdef CONFIG_FTRACE_SYSCALLS
@@ -153,7 +153,7 @@ struct perf_event_attr;
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = (void *)&__syscall_meta_##sname,\
- TRACE_SYS_ENTER_PROFILE_INIT(sname) \
+ TRACE_SYS_ENTER_PERF_INIT(sname) \
}
#define SYSCALL_TRACE_EXIT_EVENT(sname) \
@@ -175,7 +175,7 @@ struct perf_event_attr;
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = (void *)&__syscall_meta_##sname,\
- TRACE_SYS_EXIT_PROFILE_INIT(sname) \
+ TRACE_SYS_EXIT_PERF_INIT(sname) \
}
#define SYSCALL_METADATA(sname, nb) \
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 601ad7744247..ea6f9d4a20e9 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -401,18 +401,18 @@ static inline notrace int ftrace_get_offsets_##call( \
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, name, proto, args) \
\
-static void ftrace_profile_##name(proto); \
+static void perf_trace_##name(proto); \
\
static notrace int \
-ftrace_profile_enable_##name(struct ftrace_event_call *unused) \
+perf_trace_enable_##name(struct ftrace_event_call *unused) \
{ \
- return register_trace_##name(ftrace_profile_##name); \
+ return register_trace_##name(perf_trace_##name); \
} \
\
static notrace void \
-ftrace_profile_disable_##name(struct ftrace_event_call *unused) \
+perf_trace_disable_##name(struct ftrace_event_call *unused) \
{ \
- unregister_trace_##name(ftrace_profile_##name); \
+ unregister_trace_##name(perf_trace_##name); \
}
#undef DEFINE_EVENT_PRINT
@@ -507,12 +507,12 @@ ftrace_profile_disable_##name(struct ftrace_event_call *unused) \
#ifdef CONFIG_PERF_EVENTS
-#define _TRACE_PROFILE_INIT(call) \
- .profile_enable = ftrace_profile_enable_##call, \
- .profile_disable = ftrace_profile_disable_##call,
+#define _TRACE_PERF_INIT(call) \
+ .perf_event_enable = perf_trace_enable_##call, \
+ .perf_event_disable = perf_trace_disable_##call,
#else
-#define _TRACE_PROFILE_INIT(call)
+#define _TRACE_PERF_INIT(call)
#endif /* CONFIG_PERF_EVENTS */
#undef __entry
@@ -638,7 +638,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.unregfunc = ftrace_raw_unreg_event_##call, \
.print_fmt = print_fmt_##template, \
.define_fields = ftrace_define_fields_##template, \
- _TRACE_PROFILE_INIT(call) \
+ _TRACE_PERF_INIT(call) \
}
#undef DEFINE_EVENT_PRINT
@@ -657,18 +657,18 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.unregfunc = ftrace_raw_unreg_event_##call, \
.print_fmt = print_fmt_##call, \
.define_fields = ftrace_define_fields_##template, \
- _TRACE_PROFILE_INIT(call) \
+ _TRACE_PERF_INIT(call) \
}
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
/*
- * Define the insertion callback to profile events
+ * Define the insertion callback to perf events
*
* The job is very similar to ftrace_raw_event_<call> except that we don't
* insert in the ring buffer but in a perf counter.
*
- * static void ftrace_profile_<call>(proto)
+ * static void ftrace_perf_<call>(proto)
* {
* struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
* struct ftrace_event_call *event_call = &event_<call>;
@@ -757,13 +757,14 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static notrace void \
-ftrace_profile_templ_##call(struct ftrace_event_call *event_call, \
+perf_trace_templ_##call(struct ftrace_event_call *event_call, \
proto) \
{ \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
struct ftrace_raw_##call *entry; \
u64 __addr = 0, __count = 1; \
unsigned long irq_flags; \
+ struct pt_regs *__regs; \
int __entry_size; \
int __data_size; \
int rctx; \
@@ -773,10 +774,10 @@ ftrace_profile_templ_##call(struct ftrace_event_call *event_call, \
sizeof(u64)); \
__entry_size -= sizeof(u32); \
\
- if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE, \
+ if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
"profile buffer not large enough")) \
return; \
- entry = (struct ftrace_raw_##call *)ftrace_perf_buf_prepare( \
+ entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
__entry_size, event_call->id, &rctx, &irq_flags); \
if (!entry) \
return; \
@@ -784,17 +785,20 @@ ftrace_profile_templ_##call(struct ftrace_event_call *event_call, \
\
{ assign; } \
\
- ftrace_perf_buf_submit(entry, __entry_size, rctx, __addr, \
- __count, irq_flags); \
+ __regs = &__get_cpu_var(perf_trace_regs); \
+ perf_fetch_caller_regs(__regs, 2); \
+ \
+ perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
+ __count, irq_flags, __regs); \
}
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, call, proto, args) \
-static notrace void ftrace_profile_##call(proto) \
+static notrace void perf_trace_##call(proto) \
{ \
struct ftrace_event_call *event_call = &event_##call; \
\
- ftrace_profile_templ_##template(event_call, args); \
+ perf_trace_templ_##template(event_call, args); \
}
#undef DEFINE_EVENT_PRINT
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 0387100752f0..e5e5f48dbfb3 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -47,10 +47,10 @@ enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
#endif
#ifdef CONFIG_PERF_EVENTS
-int prof_sysenter_enable(struct ftrace_event_call *call);
-void prof_sysenter_disable(struct ftrace_event_call *call);
-int prof_sysexit_enable(struct ftrace_event_call *call);
-void prof_sysexit_disable(struct ftrace_event_call *call);
+int perf_sysenter_enable(struct ftrace_event_call *call);
+void perf_sysenter_disable(struct ftrace_event_call *call);
+int perf_sysexit_enable(struct ftrace_event_call *call);
+void perf_sysexit_disable(struct ftrace_event_call *call);
#endif
#endif /* _TRACE_SYSCALL_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 10:52:10 +0000