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authorLinus Torvalds <torvalds@linux-foundation.org>2018-03-31 07:59:00 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2018-03-31 07:59:00 -1000
commit10b84daddbec72c6b440216a69de9a9605127f7a (patch)
treeec43a84811df259cc8c605e1500b505ba9ff6315
parentad0500ca87894cb44091b24cf6ead02e51576df9 (diff)
parentf67b15037a7a50c57f72e69a6d59941ad90a0f0f (diff)
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "Two fixlets" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/hwbp: Simplify the perf-hwbp code, fix documentation perf/x86/intel: Fix linear IP of PEBS real_ip on Haswell and later CPUs
-rw-r--r--arch/x86/events/intel/ds.c25
-rw-r--r--kernel/events/hw_breakpoint.c30
2 files changed, 24 insertions, 31 deletions
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index d8015235ba76..5e526c54247e 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1153,6 +1153,7 @@ static void setup_pebs_sample_data(struct perf_event *event,
if (pebs == NULL)
return;
+ regs->flags &= ~PERF_EFLAGS_EXACT;
sample_type = event->attr.sample_type;
dsrc = sample_type & PERF_SAMPLE_DATA_SRC;
@@ -1197,7 +1198,6 @@ static void setup_pebs_sample_data(struct perf_event *event,
*/
*regs = *iregs;
regs->flags = pebs->flags;
- set_linear_ip(regs, pebs->ip);
if (sample_type & PERF_SAMPLE_REGS_INTR) {
regs->ax = pebs->ax;
@@ -1233,13 +1233,22 @@ static void setup_pebs_sample_data(struct perf_event *event,
#endif
}
- if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) {
- regs->ip = pebs->real_ip;
- regs->flags |= PERF_EFLAGS_EXACT;
- } else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs))
- regs->flags |= PERF_EFLAGS_EXACT;
- else
- regs->flags &= ~PERF_EFLAGS_EXACT;
+ if (event->attr.precise_ip > 1) {
+ /* Haswell and later have the eventing IP, so use it: */
+ if (x86_pmu.intel_cap.pebs_format >= 2) {
+ set_linear_ip(regs, pebs->real_ip);
+ regs->flags |= PERF_EFLAGS_EXACT;
+ } else {
+ /* Otherwise use PEBS off-by-1 IP: */
+ set_linear_ip(regs, pebs->ip);
+
+ /* ... and try to fix it up using the LBR entries: */
+ if (intel_pmu_pebs_fixup_ip(regs))
+ regs->flags |= PERF_EFLAGS_EXACT;
+ }
+ } else
+ set_linear_ip(regs, pebs->ip);
+
if ((sample_type & (PERF_SAMPLE_ADDR | PERF_SAMPLE_PHYS_ADDR)) &&
x86_pmu.intel_cap.pebs_format >= 1)
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 3f8cb1e14588..253ae2da13c3 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -427,16 +427,9 @@ EXPORT_SYMBOL_GPL(register_user_hw_breakpoint);
* modify_user_hw_breakpoint - modify a user-space hardware breakpoint
* @bp: the breakpoint structure to modify
* @attr: new breakpoint attributes
- * @triggered: callback to trigger when we hit the breakpoint
- * @tsk: pointer to 'task_struct' of the process to which the address belongs
*/
int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr)
{
- u64 old_addr = bp->attr.bp_addr;
- u64 old_len = bp->attr.bp_len;
- int old_type = bp->attr.bp_type;
- int err = 0;
-
/*
* modify_user_hw_breakpoint can be invoked with IRQs disabled and hence it
* will not be possible to raise IPIs that invoke __perf_event_disable.
@@ -451,27 +444,18 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att
bp->attr.bp_addr = attr->bp_addr;
bp->attr.bp_type = attr->bp_type;
bp->attr.bp_len = attr->bp_len;
+ bp->attr.disabled = 1;
- if (attr->disabled)
- goto end;
-
- err = validate_hw_breakpoint(bp);
- if (!err)
- perf_event_enable(bp);
+ if (!attr->disabled) {
+ int err = validate_hw_breakpoint(bp);
- if (err) {
- bp->attr.bp_addr = old_addr;
- bp->attr.bp_type = old_type;
- bp->attr.bp_len = old_len;
- if (!bp->attr.disabled)
- perf_event_enable(bp);
+ if (err)
+ return err;
- return err;
+ perf_event_enable(bp);
+ bp->attr.disabled = 0;
}
-end:
- bp->attr.disabled = attr->disabled;
-
return 0;
}
EXPORT_SYMBOL_GPL(modify_user_hw_breakpoint);