linux-kernel - [PATCH V3 4/5] perf/x86: Clean up pebs_no_xmm

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Date:   Tue, 28 May 2019 15:08:33 -0700
From:   kan.liang@...ux.intel.com
To:     mingo@...nel.org, acme@...hat.com, peterz@...radead.org,
        vincent.weaver@...ne.edu, linux-kernel@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, ak@...ux.intel.com,
        jolsa@...hat.com, eranian@...gle.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V3 4/5] perf/x86: Clean up pebs_no_xmm_regs

From: Kan Liang <kan.liang@...ux.intel.com>

Don't need pebs_no_xmm_regs anymore. The capabilities
PERF_PMU_CAP_EXTENDED_REGS can be used to check if XMM registers
collection is supported.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---

New for V3

 arch/x86/events/core.c       | 2 +-
 arch/x86/events/intel/ds.c   | 6 ++----
 arch/x86/events/perf_event.h | 3 +--
 3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 7708a6f..52a9746 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -568,7 +568,7 @@ int x86_pmu_hw_config(struct perf_event *event)
 	 * be collected in PEBS on some platforms, e.g. Icelake
 	 */
 	if (unlikely(event->attr.sample_regs_intr & PERF_REG_EXTENDED_MASK)) {
-		if (x86_pmu.pebs_no_xmm_regs)
+		if (!(event->pmu->capabilities & PERF_PMU_CAP_EXTENDED_REGS))
 			return -EINVAL;
 
 		if (!event->attr.precise_ip)
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index e6a0fa9..53f9dc5 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1964,10 +1964,9 @@ void __init intel_ds_init(void)
 	x86_pmu.bts  = boot_cpu_has(X86_FEATURE_BTS);
 	x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS);
 	x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE;
-	if (x86_pmu.version <= 4) {
+	if (x86_pmu.version <= 4)
 		x86_pmu.pebs_no_isolation = 1;
-		x86_pmu.pebs_no_xmm_regs = 1;
-	}
+
 	if (x86_pmu.pebs) {
 		char pebs_type = x86_pmu.intel_cap.pebs_trap ?  '+' : '-';
 		char *pebs_qual = "";
@@ -2023,7 +2022,6 @@ void __init intel_ds_init(void)
 				x86_get_pmu()->capabilities |= PERF_PMU_CAP_EXTENDED_REGS;
 			} else {
 				/* Only basic record supported */
-				x86_pmu.pebs_no_xmm_regs = 1;
 				x86_pmu.large_pebs_flags &=
 					~(PERF_SAMPLE_ADDR |
 					  PERF_SAMPLE_TIME |
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index d3b6e90..4e34685 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -650,8 +650,7 @@ struct x86_pmu {
 			pebs_broken		:1,
 			pebs_prec_dist		:1,
 			pebs_no_tlb		:1,
-			pebs_no_isolation	:1,
-			pebs_no_xmm_regs	:1;
+			pebs_no_isolation	:1;
 	int		pebs_record_size;
 	int		pebs_buffer_size;
 	int		max_pebs_events;
-- 
2.7.4