linux-kernel - [RFC PATCH] x86/xen/pmu: Use MSRs C001_020X instead of the legacy MSRs for Hygon

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Date:   Fri, 22 Mar 2019 18:43:39 +0800
From:   Pu Wen <puwen@...on.cn>
To:     <boris.ostrovsky@...cle.com>, <jgross@...e.com>, <bp@...en8.de>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <x86@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        Pu Wen <puwen@...on.cn>
Subject: [RFC PATCH] x86/xen/pmu: Use MSRs C001_020X instead of the legacy MSRs for Hygon

The Hygon Dhyana processor supports MSRs C001_020X for the performance
monitor counter(PMC). There are six core performance events counters for
Dhyana but there are only four legacy PMC MSRs. So switching to use MSRs
C001_020X(compatible with the F15H ones) for Xen vPMU infrastructure on
Hygon platform.

Signed-off-by: Pu Wen <puwen@...on.cn>
---
 arch/x86/xen/pmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
index e13b0b4..6480eed 100644
--- a/arch/x86/xen/pmu.c
+++ b/arch/x86/xen/pmu.c
@@ -92,11 +92,11 @@ static void xen_pmu_arch_init(void)
 			break;
 		}
 	} else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
-		amd_num_counters = F10H_NUM_COUNTERS;
-		amd_counters_base = MSR_K7_PERFCTR0;
-		amd_ctrls_base = MSR_K7_EVNTSEL0;
-		amd_msr_step = 1;
-		k7_counters_mirrored = 0;
+		amd_num_counters = F15H_NUM_COUNTERS;
+		amd_counters_base = MSR_F15H_PERF_CTR;
+		amd_ctrls_base = MSR_F15H_PERF_CTL;
+		amd_msr_step = 2;
+		k7_counters_mirrored = 1;
 	} else {
 		uint32_t eax, ebx, ecx, edx;
 
-- 
2.7.4