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authorLuwei Kang <luwei.kang@intel.com>2018-10-24 16:05:07 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2018-12-21 11:28:32 +0100
commit61be2998ca541f7d9f487479b2ec519d83328085 (patch)
tree6c6f53ba15963a0b25f60b8244617b5d337ecc14 /arch
parentf6d079ce867d679e4dffef5b3112c7634215fd88 (diff)
perf/x86/intel/pt: Introduce intel_pt_validate_cap()
intel_pt_validate_hw_cap() validates whether a given PT capability is supported by the hardware. It checks the PT capability array which reflects the capabilities of the hardware on which the code is executed. For setting up PT for KVM guests this is not correct as the capability array for the guest can be different from the host array. Provide a new function to check against a given capability array. Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Luwei Kang <luwei.kang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/events/intel/pt.c12
-rw-r--r--arch/x86/include/asm/intel_pt.h2
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 2e83d8d8a52b..918a43937749 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -75,14 +75,20 @@ static struct pt_cap_desc {
PT_CAP(psb_periods, 1, CPUID_EBX, 0xffff0000),
};
-u32 intel_pt_validate_hw_cap(enum pt_capabilities cap)
+u32 intel_pt_validate_cap(u32 *caps, enum pt_capabilities capability)
{
- struct pt_cap_desc *cd = &pt_caps[cap];
- u32 c = pt_pmu.caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg];
+ struct pt_cap_desc *cd = &pt_caps[capability];
+ u32 c = caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg];
unsigned int shift = __ffs(cd->mask);
return (c & cd->mask) >> shift;
}
+EXPORT_SYMBOL_GPL(intel_pt_validate_cap);
+
+u32 intel_pt_validate_hw_cap(enum pt_capabilities cap)
+{
+ return intel_pt_validate_cap(pt_pmu.caps, cap);
+}
EXPORT_SYMBOL_GPL(intel_pt_validate_hw_cap);
static ssize_t pt_cap_show(struct device *cdev,
diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h
index fa4b4fd2dbed..00f4afb2b7de 100644
--- a/arch/x86/include/asm/intel_pt.h
+++ b/arch/x86/include/asm/intel_pt.h
@@ -26,9 +26,11 @@ enum pt_capabilities {
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
void cpu_emergency_stop_pt(void);
extern u32 intel_pt_validate_hw_cap(enum pt_capabilities cap);
+extern u32 intel_pt_validate_cap(u32 *caps, enum pt_capabilities cap);
#else
static inline void cpu_emergency_stop_pt(void) {}
static inline u32 intel_pt_validate_hw_cap(enum pt_capabilities cap) { return 0; }
+static inline u32 intel_pt_validate_cap(u32 *caps, enum pt_capabilities capability) { return 0; }
#endif
#endif /* _ASM_X86_INTEL_PT_H */