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perf/AMD/IBS: Add sysfs support 

Add sysfs format entries for AMD IBS PMUs:

 # find /sys/bus/event_source/devices/ibs_*/format
 /sys/bus/event_source/devices/ibs_fetch/format
 /sys/bus/event_source/devices/ibs_fetch/format/rand_en
 /sys/bus/event_source/devices/ibs_op/format
 /sys/bus/event_source/devices/ibs_op/format/cnt_ctl

This allows to specify following IBS options:

 $ perf record -e ibs_fetch/rand_en=1/GH ...
 $ perf record -e ibs_op/cnt_ctl=1/GH ...

Option cnt_ctl is only enabled if the IBS_CAPS_OPCNT bit is set in IBS
cpuid feature flags (AMD family 10h RevC and above).

Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1347447584-28405-1-git-send-email-robert.richter@amd.com
[ Added small readability improvements. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Robert Richter 2012-09-12 12:59:44 +02:00 committed by Ingo Molnar
parent c942ee2e62
commit 2e132b12f7
1 changed files with 49 additions and 12 deletions
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61
arch/x86/kernel/cpu/perf_event_amd_ibs.c
View File

@ -41,17 +41,22 @@ struct cpu_perf_ibs {
};
struct perf_ibs {
struct pmu pmu;
unsigned int msr;
u64 config_mask;
u64 cnt_mask;
u64 enable_mask;
u64 valid_mask;
u64 max_period;
unsigned long offset_mask[1];
int offset_max;
struct cpu_perf_ibs __percpu *pcpu;
u64 (*get_count)(u64 config);
struct pmu pmu;
unsigned int msr;
u64 config_mask;
u64 cnt_mask;
u64 enable_mask;
u64 valid_mask;
u64 max_period;
unsigned long offset_mask[1];
int offset_max;
struct cpu_perf_ibs __percpu *pcpu;
struct attribute **format_attrs;
struct attribute_group format_group;
const struct attribute_group *attr_groups[2];
u64 (*get_count)(u64 config);
};
struct perf_ibs_data {
@ -446,6 +451,19 @@ static void perf_ibs_del(struct perf_event *event, int flags)
static void perf_ibs_read(struct perf_event *event) { }
PMU_FORMAT_ATTR(rand_en, "config:57");
PMU_FORMAT_ATTR(cnt_ctl, "config:19");
static struct attribute *ibs_fetch_format_attrs[] = {
&format_attr_rand_en.attr,
NULL,
};
static struct attribute *ibs_op_format_attrs[] = {
NULL, /* &format_attr_cnt_ctl.attr if IBS_CAPS_OPCNT */
NULL,
};
static struct perf_ibs perf_ibs_fetch = {
.pmu = {
.task_ctx_nr = perf_invalid_context,
@ -465,6 +483,7 @@ static struct perf_ibs perf_ibs_fetch = {
.max_period = IBS_FETCH_MAX_CNT << 4,
.offset_mask = { MSR_AMD64_IBSFETCH_REG_MASK },
.offset_max = MSR_AMD64_IBSFETCH_REG_COUNT,
.format_attrs = ibs_fetch_format_attrs,
.get_count = get_ibs_fetch_count,
};
@ -488,6 +507,7 @@ static struct perf_ibs perf_ibs_op = {
.max_period = IBS_OP_MAX_CNT << 4,
.offset_mask = { MSR_AMD64_IBSOP_REG_MASK },
.offset_max = MSR_AMD64_IBSOP_REG_COUNT,
.format_attrs = ibs_op_format_attrs,
.get_count = get_ibs_op_count,
};
@ -597,6 +617,17 @@ static __init int perf_ibs_pmu_init(struct perf_ibs *perf_ibs, char *name)
perf_ibs->pcpu = pcpu;
/* register attributes */
if (perf_ibs->format_attrs[0]) {
memset(&perf_ibs->format_group, 0, sizeof(perf_ibs->format_group));
perf_ibs->format_group.name = "format";
perf_ibs->format_group.attrs = perf_ibs->format_attrs;
memset(&perf_ibs->attr_groups, 0, sizeof(perf_ibs->attr_groups));
perf_ibs->attr_groups[0] = &perf_ibs->format_group;
perf_ibs->pmu.attr_groups = perf_ibs->attr_groups;
}
ret = perf_pmu_register(&perf_ibs->pmu, name, -1);
if (ret) {
perf_ibs->pcpu = NULL;
@ -608,13 +639,19 @@ static __init int perf_ibs_pmu_init(struct perf_ibs *perf_ibs, char *name)
static __init int perf_event_ibs_init(void)
{
struct attribute **attr = ibs_op_format_attrs;
if (!ibs_caps)
return -ENODEV; /* ibs not supported by the cpu */
perf_ibs_pmu_init(&perf_ibs_fetch, "ibs_fetch");
if (ibs_caps & IBS_CAPS_OPCNT)
if (ibs_caps & IBS_CAPS_OPCNT) {
perf_ibs_op.config_mask |= IBS_OP_CNT_CTL;
*attr++ = &format_attr_cnt_ctl.attr;
}
perf_ibs_pmu_init(&perf_ibs_op, "ibs_op");
register_nmi_handler(NMI_LOCAL, perf_ibs_nmi_handler, 0, "perf_ibs");
printk(KERN_INFO "perf: AMD IBS detected (0x%08x)\n", ibs_caps);