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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
This commit is contained in:
Linus Torvalds 2018-03-31 07:59:00 -10:00
parent ad0500ca87 f67b15037a
commit 10b84daddb
2 changed files with 24 additions and 31 deletions
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25
arch/x86/events/intel/ds.c
View File

@ -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)

30
kernel/events/hw_breakpoint.c
View File

@ -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;
if (!attr->disabled) {
int err = validate_hw_breakpoint(bp);
if (err)
return err;
err = validate_hw_breakpoint(bp);
if (!err)
perf_event_enable(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);
return err;
bp->attr.disabled = 0;
}
end:
bp->attr.disabled = attr->disabled;
return 0;
}
EXPORT_SYMBOL_GPL(modify_user_hw_breakpoint);