[PATCH v9 02/12] perf/x86/intel/pt: Change pt_cap_get() to a public function

[Luwei Kang]

From: Chao Peng <chao.p.p...@linux.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.p...@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.k...@intel.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