Commit b2d65047 authored by Like Xu's avatar Like Xu Committed by Peter Zijlstra
Browse files

perf/x86/lbr: Add interface to get LBR information 



The LBR records msrs are model specific. The perf subsystem has already
obtained the base addresses of LBR records based on the cpu model.

Therefore, an interface is added to allow callers outside the perf
subsystem to obtain these LBR information. It's useful for hypervisors
to emulate the LBR feature for guests with less code.

Signed-off-by: default avatarLike Xu <like.xu@linux.intel.com>
Signed-off-by: default avatarWei Wang <wei.w.wang@intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200613080958.132489-4-like.xu@linux.intel.com
parent 027440b5

arch/x86/events/intel/lbr.c

+20 −0
Original line number Diff line number Diff line
@@ -1343,3 +1343,23 @@ void intel_pmu_lbr_init_knl(void) 
	if (x86_pmu.intel_cap.lbr_format == LBR_FORMAT_LIP)

		x86_pmu.intel_cap.lbr_format = LBR_FORMAT_EIP_FLAGS;

}



/**

 * x86_perf_get_lbr - get the LBR records information

 *

 * @lbr: the caller's memory to store the LBR records information

 *

 * Returns: 0 indicates the LBR info has been successfully obtained

 */

int x86_perf_get_lbr(struct x86_pmu_lbr *lbr)

{

	int lbr_fmt = x86_pmu.intel_cap.lbr_format;



	lbr->nr = x86_pmu.lbr_nr;

	lbr->from = x86_pmu.lbr_from;

	lbr->to = x86_pmu.lbr_to;

	lbr->info = (lbr_fmt == LBR_FORMAT_INFO) ? MSR_LBR_INFO_0 : 0;



	return 0;

}

EXPORT_SYMBOL_GPL(x86_perf_get_lbr);

arch/x86/include/asm/perf_event.h

+12 −0
Original line number Diff line number Diff line
@@ -333,6 +333,13 @@ struct perf_guest_switch_msr { 
	u64 host, guest;

};



struct x86_pmu_lbr {

	unsigned int	nr;

	unsigned int	from;

	unsigned int	to;

	unsigned int	info;

};



extern void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap);

extern void perf_check_microcode(void);

extern int x86_perf_rdpmc_index(struct perf_event *event);
@@ -348,12 +355,17 @@ static inline void perf_check_microcode(void) { } 


#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)

extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr);

extern int x86_perf_get_lbr(struct x86_pmu_lbr *lbr);

#else

static inline struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr)

{

	*nr = 0;

	return NULL;

}

static inline int x86_perf_get_lbr(struct x86_pmu_lbr *lbr)

{

	return -1;

}

#endif



#ifdef CONFIG_CPU_SUP_INTEL

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