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Message-Id: <1526964735-16566-3-git-send-email-luwei.kang@intel.com>
Date: Tue, 22 May 2018 12:52:05 +0800
From: Luwei Kang <luwei.kang@...el.com>
To: kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, chao.p.peng@...ux.intel.com,
thomas.lendacky@....com, bp@...e.de, Kan.liang@...el.com,
Janakarajan.Natarajan@....com, dwmw@...zon.co.uk,
linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
peterz@...radead.org, mathieu.poirier@...aro.org,
kstewart@...uxfoundation.org, gregkh@...uxfoundation.org,
pbonzini@...hat.com, rkrcmar@...hat.com, david@...hat.com,
bsd@...hat.com, yu.c.zhang@...ux.intel.com, joro@...tes.org,
Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH v9 02/12] perf/x86/intel/pt: Change pt_cap_get() to a public function
From: Chao Peng <chao.p.peng@...ux.intel.com>
Change pt_cap_get() to a public function that KVM
can access this function to check if specific
feature is supported on hardware.
Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@...el.com>
---
arch/x86/events/intel/pt.c | 3 ++-
arch/x86/events/intel/pt.h | 21 ---------------------
arch/x86/include/asm/intel_pt.h | 23 +++++++++++++++++++++++
3 files changed, 25 insertions(+), 22 deletions(-)
diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 3b99394..c80e2f5 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -75,7 +75,7 @@
PT_CAP(psb_periods, 1, CPUID_EBX, 0xffff0000),
};
-static u32 pt_cap_get(enum pt_capabilities cap)
+u32 pt_cap_get(enum pt_capabilities cap)
{
struct pt_cap_desc *cd = &pt_caps[cap];
u32 c = pt_pmu.caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg];
@@ -83,6 +83,7 @@ static u32 pt_cap_get(enum pt_capabilities cap)
return (c & cd->mask) >> shift;
}
+EXPORT_SYMBOL_GPL(pt_cap_get);
static ssize_t pt_cap_show(struct device *cdev,
struct device_attribute *attr,
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h
index 0050ca1..269e15a 100644
--- a/arch/x86/events/intel/pt.h
+++ b/arch/x86/events/intel/pt.h
@@ -45,30 +45,9 @@ struct topa_entry {
u64 rsvd4 : 16;
};
-#define PT_CPUID_LEAVES 2
-#define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */
-
/* TSC to Core Crystal Clock Ratio */
#define CPUID_TSC_LEAF 0x15
-enum pt_capabilities {
- PT_CAP_max_subleaf = 0,
- PT_CAP_cr3_filtering,
- PT_CAP_psb_cyc,
- PT_CAP_ip_filtering,
- PT_CAP_mtc,
- PT_CAP_ptwrite,
- PT_CAP_power_event_trace,
- PT_CAP_topa_output,
- PT_CAP_topa_multiple_entries,
- PT_CAP_single_range_output,
- PT_CAP_payloads_lip,
- PT_CAP_num_address_ranges,
- PT_CAP_mtc_periods,
- PT_CAP_cycle_thresholds,
- PT_CAP_psb_periods,
-};
-
struct pt_pmu {
struct pmu pmu;
u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h
index b523f51..4270421 100644
--- a/arch/x86/include/asm/intel_pt.h
+++ b/arch/x86/include/asm/intel_pt.h
@@ -2,10 +2,33 @@
#ifndef _ASM_X86_INTEL_PT_H
#define _ASM_X86_INTEL_PT_H
+#define PT_CPUID_LEAVES 2
+#define PT_CPUID_REGS_NUM 4 /* number of regsters (eax, ebx, ecx, edx) */
+
+enum pt_capabilities {
+ PT_CAP_max_subleaf = 0,
+ PT_CAP_cr3_filtering,
+ PT_CAP_psb_cyc,
+ PT_CAP_ip_filtering,
+ PT_CAP_mtc,
+ PT_CAP_ptwrite,
+ PT_CAP_power_event_trace,
+ PT_CAP_topa_output,
+ PT_CAP_topa_multiple_entries,
+ PT_CAP_single_range_output,
+ PT_CAP_payloads_lip,
+ PT_CAP_num_address_ranges,
+ PT_CAP_mtc_periods,
+ PT_CAP_cycle_thresholds,
+ PT_CAP_psb_periods,
+};
+
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
void cpu_emergency_stop_pt(void);
+extern u32 pt_cap_get(enum pt_capabilities cap);
#else
static inline void cpu_emergency_stop_pt(void) {}
+static inline u32 pt_cap_get(enum pt_capabilities cap) { return 0; }
#endif
#endif /* _ASM_X86_INTEL_PT_H */
--
1.8.3.1
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