Commit-ID: d4cf1949f9689314aef962eea95df84a8288d097
Gitweb: http://git.kernel.org/tip/d4cf1949f9689314aef962eea95df84a8288d097
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 23 Jun 2016 10:44:49 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 27 Jun 2016 11:34:21 +0200
perf/x86/intel: Add {rd,wr}lbr_{to,from} wrappers
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@xxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/events/intel/lbr.c | 53 ++++++++++++++++++++++++++++++++++-----------
1 file changed, 40 insertions(+), 13 deletions(-)
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 52bef15..cc4555a 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -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;
--
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