[PATCH v7 02/13] perf/x86/intel/pt: Change pt_cap_get() to a public function

Luwei Kang
2018-05-03T12:13:17Z

From: Chao Peng <chao.p.peng@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.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@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 81fd41d..a5a7e44 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