linux-kernel - [PATCH V7 3/5] perf/x86/intel: Clean up SNB pebs quirk

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Message-Id: <1549319013-4522-3-git-send-email-kan.liang@linux.intel.com>
Date:   Mon,  4 Feb 2019 14:23:31 -0800
From:   kan.liang@...ux.intel.com
To:     x86@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        bp@...en8.de, peterz@...radead.org, mingo@...hat.com
Cc:     ak@...ux.intel.com, eranian@...gle.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V7 3/5] perf/x86/intel: Clean up SNB pebs quirk

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

Clean up SNB pebs quirk to use the new facility to check for min
microcode revisions.

Only check the boot CPU, assuming models and features are consistent
over all CPUs.

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

No changes since V6

 arch/x86/events/intel/core.c | 35 ++++++++++-------------------------
 1 file changed, 10 insertions(+), 25 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 8d94f40..23672d5 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3786,36 +3786,21 @@ static __init void intel_pebs_isolation_quirk(void)
 	intel_check_pebs_isolation();
 }
 
-static int intel_snb_pebs_broken(int cpu)
-{
-	u32 rev = UINT_MAX; /* default to broken for unknown models */
-
-	switch (cpu_data(cpu).x86_model) {
-	case INTEL_FAM6_SANDYBRIDGE:
-		rev = 0x28;
-		break;
-
-	case INTEL_FAM6_SANDYBRIDGE_X:
-		switch (cpu_data(cpu).x86_stepping) {
-		case 6: rev = 0x618; break;
-		case 7: rev = 0x70c; break;
-		}
-	}
+static const struct x86_cpu_desc pebs_ucodes[] = {
+	INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE,		7, 0x00000028),
+	INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE_X,	6, 0x00000618),
+	INTEL_CPU_DESC(INTEL_FAM6_SANDYBRIDGE_X,	7, 0x0000070c),
+	{}
+};
 
-	return (cpu_data(cpu).microcode < rev);
+static bool intel_snb_pebs_broken(void)
+{
+	return !x86_cpu_has_min_microcode_rev(pebs_ucodes);
 }
 
 static void intel_snb_check_microcode(void)
 {
-	int pebs_broken = 0;
-	int cpu;
-
-	for_each_online_cpu(cpu) {
-		if ((pebs_broken = intel_snb_pebs_broken(cpu)))
-			break;
-	}
-
-	if (pebs_broken == x86_pmu.pebs_broken)
+	if (intel_snb_pebs_broken() == x86_pmu.pebs_broken)
 		return;
 
 	/*
-- 
2.7.4