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-rw-r--r--include/linux/hw_breakpoint.h137
-rw-r--r--include/linux/perf_event.h37
2 files changed, 173 insertions, 1 deletions
diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
new file mode 100644
index 00000000000..0b98cbf76da
--- /dev/null
+++ b/include/linux/hw_breakpoint.h
@@ -0,0 +1,137 @@
+#ifndef _LINUX_HW_BREAKPOINT_H
+#define _LINUX_HW_BREAKPOINT_H
+
+#include <linux/perf_event.h>
+
+enum {
+ HW_BREAKPOINT_LEN_1 = 1,
+ HW_BREAKPOINT_LEN_2 = 2,
+ HW_BREAKPOINT_LEN_4 = 4,
+ HW_BREAKPOINT_LEN_8 = 8,
+};
+
+enum {
+ HW_BREAKPOINT_R = 1,
+ HW_BREAKPOINT_W = 2,
+ HW_BREAKPOINT_X = 4,
+};
+
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+
+static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
+{
+ return bp->attr.bp_addr;
+}
+
+static inline int hw_breakpoint_type(struct perf_event *bp)
+{
+ return bp->attr.bp_type;
+}
+
+static inline int hw_breakpoint_len(struct perf_event *bp)
+{
+ return bp->attr.bp_len;
+}
+
+extern struct perf_event *
+register_user_hw_breakpoint(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ struct task_struct *tsk,
+ bool active);
+
+/* FIXME: only change from the attr, and don't unregister */
+extern struct perf_event *
+modify_user_hw_breakpoint(struct perf_event *bp,
+ unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ struct task_struct *tsk,
+ bool active);
+
+/*
+ * Kernel breakpoints are not associated with any particular thread.
+ */
+extern struct perf_event *
+register_wide_hw_breakpoint_cpu(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ int cpu,
+ bool active);
+
+extern struct perf_event **
+register_wide_hw_breakpoint(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ bool active);
+
+extern int register_perf_hw_breakpoint(struct perf_event *bp);
+extern int __register_perf_hw_breakpoint(struct perf_event *bp);
+extern void unregister_hw_breakpoint(struct perf_event *bp);
+extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
+
+extern int reserve_bp_slot(struct perf_event *bp);
+extern void release_bp_slot(struct perf_event *bp);
+
+extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
+
+static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
+{
+ return &bp->hw.info;
+}
+
+#else /* !CONFIG_HAVE_HW_BREAKPOINT */
+
+static inline struct perf_event *
+register_user_hw_breakpoint(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ struct task_struct *tsk,
+ bool active) { return NULL; }
+static inline struct perf_event *
+modify_user_hw_breakpoint(struct perf_event *bp,
+ unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ struct task_struct *tsk,
+ bool active) { return NULL; }
+static inline struct perf_event *
+register_wide_hw_breakpoint_cpu(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ int cpu,
+ bool active) { return NULL; }
+static inline struct perf_event **
+register_wide_hw_breakpoint(unsigned long addr,
+ int len,
+ int type,
+ perf_callback_t triggered,
+ bool active) { return NULL; }
+static inline int
+register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
+static inline int
+__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
+static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
+static inline void
+unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
+static inline int
+reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
+static inline void release_bp_slot(struct perf_event *bp) { }
+
+static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
+
+static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
+
+#endif /* _LINUX_HW_BREAKPOINT_H */
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 7f87563c848..b5cdac0de37 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -18,6 +18,10 @@
#include <linux/ioctl.h>
#include <asm/byteorder.h>
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+#include <asm/hw_breakpoint.h>
+#endif
+
/*
* User-space ABI bits:
*/
@@ -31,6 +35,7 @@ enum perf_type_id {
PERF_TYPE_TRACEPOINT = 2,
PERF_TYPE_HW_CACHE = 3,
PERF_TYPE_RAW = 4,
+ PERF_TYPE_BREAKPOINT = 5,
PERF_TYPE_MAX, /* non-ABI */
};
@@ -209,6 +214,15 @@ struct perf_event_attr {
__u32 wakeup_events; /* wakeup every n events */
__u32 wakeup_watermark; /* bytes before wakeup */
};
+
+ union {
+ struct { /* Hardware breakpoint info */
+ __u64 bp_addr;
+ __u32 bp_type;
+ __u32 bp_len;
+ };
+ };
+
__u32 __reserved_2;
__u64 __reserved_3;
@@ -478,6 +492,11 @@ struct hw_perf_event {
s64 remaining;
struct hrtimer hrtimer;
};
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ union { /* breakpoint */
+ struct arch_hw_breakpoint info;
+ };
+#endif
};
atomic64_t prev_count;
u64 sample_period;
@@ -546,6 +565,8 @@ struct perf_pending_entry {
void (*func)(struct perf_pending_entry *);
};
+typedef void (*perf_callback_t)(struct perf_event *, void *);
+
/**
* struct perf_event - performance event kernel representation:
*/
@@ -588,7 +609,7 @@ struct perf_event {
u64 tstamp_running;
u64 tstamp_stopped;
- struct perf_event_attr attr;
+ struct perf_event_attr attr;
struct hw_perf_event hw;
struct perf_event_context *ctx;
@@ -641,6 +662,10 @@ struct perf_event {
struct event_filter *filter;
#endif
+ perf_callback_t callback;
+
+ perf_callback_t event_callback;
+
#endif /* CONFIG_PERF_EVENTS */
};
@@ -745,6 +770,13 @@ extern int hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu);
extern void perf_event_update_userpage(struct perf_event *event);
+extern int perf_event_release_kernel(struct perf_event *event);
+extern struct perf_event *
+perf_event_create_kernel_counter(struct perf_event_attr *attr,
+ int cpu,
+ pid_t pid,
+ perf_callback_t callback);
+extern u64 perf_event_read_value(struct perf_event *event);
struct perf_sample_data {
u64 type;
@@ -821,6 +853,7 @@ extern int sysctl_perf_event_sample_rate;
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_bp_event(struct perf_event *event, void *data);
#ifndef perf_misc_flags
#define perf_misc_flags(regs) (user_mode(regs) ? PERF_RECORD_MISC_USER : \
@@ -855,6 +888,8 @@ static inline int perf_event_task_enable(void) { return -EINVAL; }
static inline void
perf_sw_event(u32 event_id, u64 nr, int nmi,
struct pt_regs *regs, u64 addr) { }
+static inline void
+perf_bp_event(struct perf_event *event, void *data) { }
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
static inline void perf_event_comm(struct task_struct *tsk) { }
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 20:09:39 +0000