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Commit 51041943 authored by Robert Richter's avatar Robert Richter Committed by Ingo Molnar
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perf/x86: Implement IBS event configuration 



This patch implements perf configuration for AMD IBS. The IBS
pmu is selected using the type attribute in sysfs. There are two
types of ibs pmus, for instruction fetch (IBS_FETCH) and for
instruction execution (IBS_OP):

 /sys/bus/event_source/devices/ibs_fetch/type
 /sys/bus/event_source/devices/ibs_op/type

Except for the sample period IBS can only be set up with raw
config values and raw data samples. The event attributes for the
syscall should be programmed like this (IBS_FETCH):

        type = get_pmu_type("/sys/bus/event_source/devices/ibs_fetch/type");

        memset(&attr, 0, sizeof(attr));
        attr.type        = type;
        attr.sample_type = PERF_SAMPLE_CPU | PERF_SAMPLE_RAW;
        attr.config      = IBS_FETCH_CONFIG_DEFAULT;

This implementation does not yet support 64 bit counters. It is
limited to the hardware counter bit width which is 20 bits. 64
bit support can be added later.

Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1323968199-9326-2-git-send-email-robert.richter@amd.com


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 3f33ab1c

arch/x86/kernel/cpu/perf_event_amd_ibs.c

+85 −7
Original line number Diff line number Diff line
@@ -16,12 +16,67 @@ static u32 ibs_caps; 


#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD)



static struct pmu perf_ibs;

#define IBS_FETCH_CONFIG_MASK	(IBS_FETCH_RAND_EN | IBS_FETCH_MAX_CNT)

#define IBS_OP_CONFIG_MASK	IBS_OP_MAX_CNT



struct perf_ibs {

	struct pmu	pmu;

	unsigned int	msr;

	u64		config_mask;

	u64		cnt_mask;

	u64		enable_mask;

};



static struct perf_ibs perf_ibs_fetch;

static struct perf_ibs perf_ibs_op;



static struct perf_ibs *get_ibs_pmu(int type)

{

	if (perf_ibs_fetch.pmu.type == type)

		return &perf_ibs_fetch;

	if (perf_ibs_op.pmu.type == type)

		return &perf_ibs_op;

	return NULL;

}



static int perf_ibs_init(struct perf_event *event)

{

	if (perf_ibs.type != event->attr.type)

	struct hw_perf_event *hwc = &event->hw;

	struct perf_ibs *perf_ibs;

	u64 max_cnt, config;



	perf_ibs = get_ibs_pmu(event->attr.type);

	if (!perf_ibs)

		return -ENOENT;



	config = event->attr.config;

	if (config & ~perf_ibs->config_mask)

		return -EINVAL;



	if (hwc->sample_period) {

		if (config & perf_ibs->cnt_mask)

			/* raw max_cnt may not be set */

			return -EINVAL;

		if (hwc->sample_period & 0x0f)

			/* lower 4 bits can not be set in ibs max cnt */

			return -EINVAL;

		max_cnt = hwc->sample_period >> 4;

		if (max_cnt & ~perf_ibs->cnt_mask)

			/* out of range */

			return -EINVAL;

		config |= max_cnt;

	} else {

		max_cnt = config & perf_ibs->cnt_mask;

		event->attr.sample_period = max_cnt << 4;

		hwc->sample_period = event->attr.sample_period;

	}



	if (!max_cnt)

		return -EINVAL;



	hwc->config_base = perf_ibs->msr;

	hwc->config = config;



	return 0;

}
@@ -34,10 +89,32 @@ static void perf_ibs_del(struct perf_event *event, int flags) 
{

}



static struct pmu perf_ibs = {

static struct perf_ibs perf_ibs_fetch = {

	.pmu = {

		.task_ctx_nr	= perf_invalid_context,



		.event_init	= perf_ibs_init,

		.add		= perf_ibs_add,

		.del		= perf_ibs_del,

	},

	.msr			= MSR_AMD64_IBSFETCHCTL,

	.config_mask		= IBS_FETCH_CONFIG_MASK,

	.cnt_mask		= IBS_FETCH_MAX_CNT,

	.enable_mask		= IBS_FETCH_ENABLE,

};



static struct perf_ibs perf_ibs_op = {

	.pmu = {

		.task_ctx_nr	= perf_invalid_context,



		.event_init	= perf_ibs_init,

		.add		= perf_ibs_add,

		.del		= perf_ibs_del,

	},

	.msr			= MSR_AMD64_IBSOPCTL,

	.config_mask		= IBS_OP_CONFIG_MASK,

	.cnt_mask		= IBS_OP_MAX_CNT,

	.enable_mask		= IBS_OP_ENABLE,

};



static __init int perf_event_ibs_init(void)
@@ -45,7 +122,8 @@ static __init int perf_event_ibs_init(void) 
	if (!ibs_caps)

		return -ENODEV;	/* ibs not supported by the cpu */



	perf_pmu_register(&perf_ibs, "ibs", -1);

	perf_pmu_register(&perf_ibs_fetch.pmu, "ibs_fetch", -1);

	perf_pmu_register(&perf_ibs_op.pmu, "ibs_op", -1);

	printk(KERN_INFO "perf: AMD IBS detected (0x%08x)\n", ibs_caps);



	return 0;