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perf/x86/intel: Add {rd,wr}lbr_{to,from} wrappers

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The whole rdmsr()/wrmsr() for lbr_from got a little unweildy with the
sign extension quirk, provide a few simple wrappers to clean things up.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2016-06-23 10:44:49 +02:00 committed by Ingo Molnar
parent 71adae99ed
commit d4cf1949f9
1 changed files with 40 additions and 13 deletions
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53
arch/x86/events/intel/lbr.c
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@ -289,12 +289,42 @@ inline u64 lbr_from_signext_quirk_wr(u64 val)
*/
u64 lbr_from_signext_quirk_rd(u64 val)
{
if (static_branch_unlikely(&lbr_from_quirk_key))
if (static_branch_unlikely(&lbr_from_quirk_key)) {
/*
* Quirk is on when TSX is not enabled. Therefore TSX
* flags must be read as OFF.
*/
val &= ~(LBR_FROM_FLAG_IN_TX | LBR_FROM_FLAG_ABORT);
}
return val;
}
static inline void wrlbr_from(unsigned int idx, u64 val)
{
val = lbr_from_signext_quirk_wr(val);
wrmsrl(x86_pmu.lbr_from + idx, val);
}
static inline void wrlbr_to(unsigned int idx, u64 val)
{
wrmsrl(x86_pmu.lbr_to + idx, val);
}
static inline u64 rdlbr_from(unsigned int idx)
{
u64 val;
rdmsrl(x86_pmu.lbr_from + idx, val);
return lbr_from_signext_quirk_rd(val);
}
static inline u64 rdlbr_to(unsigned int idx)
{
u64 val;
rdmsrl(x86_pmu.lbr_from + idx, val);
return val;
}
@ -314,9 +344,9 @@ static void __intel_pmu_lbr_restore(struct x86_perf_task_context *task_ctx)
tos = task_ctx->tos;
for (i = 0; i < tos; i++) {
lbr_idx = (tos - i) & mask;
wrmsrl(x86_pmu.lbr_from + lbr_idx,
lbr_from_signext_quirk_wr(task_ctx->lbr_from[i]));
wrmsrl(x86_pmu.lbr_to + lbr_idx, task_ctx->lbr_to[i]);
wrlbr_from(lbr_idx, task_ctx->lbr_from[i]);
wrlbr_to (lbr_idx, task_ctx->lbr_to[i]);
if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO)
wrmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]);
}
@ -326,9 +356,9 @@ static void __intel_pmu_lbr_restore(struct x86_perf_task_context *task_ctx)
static void __intel_pmu_lbr_save(struct x86_perf_task_context *task_ctx)
{
int i;
unsigned lbr_idx, mask;
u64 tos, val;
u64 tos;
int i;
if (task_ctx->lbr_callstack_users == 0) {
task_ctx->lbr_stack_state = LBR_NONE;
@ -339,9 +369,8 @@ static void __intel_pmu_lbr_save(struct x86_perf_task_context *task_ctx)
tos = intel_pmu_lbr_tos();
for (i = 0; i < tos; i++) {
lbr_idx = (tos - i) & mask;
rdmsrl(x86_pmu.lbr_from + lbr_idx, val);
task_ctx->lbr_from[i] = lbr_from_signext_quirk_rd(val);
rdmsrl(x86_pmu.lbr_to + lbr_idx, task_ctx->lbr_to[i]);
task_ctx->lbr_from[i] = rdlbr_from(lbr_idx);
task_ctx->lbr_to[i] = rdlbr_to(lbr_idx);
if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_INFO)
rdmsrl(MSR_LBR_INFO_0 + lbr_idx, task_ctx->lbr_info[i]);
}
@ -517,10 +546,8 @@ static void intel_pmu_lbr_read_64(struct cpu_hw_events *cpuc)
u16 cycles = 0;
int lbr_flags = lbr_desc[lbr_format];
rdmsrl(x86_pmu.lbr_from + lbr_idx, from);
from = lbr_from_signext_quirk_rd(from);
rdmsrl(x86_pmu.lbr_to + lbr_idx, to);
from = rdlbr_from(lbr_idx);
to = rdlbr_to(lbr_idx);
if (lbr_format == LBR_FORMAT_INFO && need_info) {
u64 info;