Add support for the sampling facility to allow hardware-based sampling using
CPU cycles. The cpum_sf PMU provides two perf events supporting available
sampling functions.
Many existing pfmlib functions of the counter facility support (cpum_cf) have
been reused.
Signed-off-by: Hendrik Brueckner <brueck...@linux.vnet.ibm.com>
---
include/perfmon/pfmlib.h | 2 +
lib/events/s390x_cpumf_events.h | 16 +++++++
lib/pfmlib_common.c | 1 +
lib/pfmlib_priv.h | 1 +
lib/pfmlib_s390x_cpumf.c | 91 ++++++++++++++++++++++++++++-----------
5 files changed, 86 insertions(+), 25 deletions(-)
diff --git a/include/perfmon/pfmlib.h b/include/perfmon/pfmlib.h
index 5434a96..6a90dd5 100644
--- a/include/perfmon/pfmlib.h
+++ b/include/perfmon/pfmlib.h
@@ -198,6 +198,8 @@ typedef enum {
PFM_PMU_ARM_QCOM_KRAIT, /* Qualcomm Krait */
+ PFM_PMU_S390X_CPUM_SF, /* s390x: CPU-M sampling facility */
+
/* MUST ADD NEW PMU MODELS HERE */
PFM_PMU_MAX /* end marker */
diff --git a/lib/events/s390x_cpumf_events.h b/lib/events/s390x_cpumf_events.h
index 5e27fe6..e00b088 100644
--- a/lib/events/s390x_cpumf_events.h
+++ b/lib/events/s390x_cpumf_events.h
@@ -840,4 +840,20 @@ static const pme_cpumf_ctr_t cpumcf_zec12_counters[] = {
},
};
+static const pme_cpumf_ctr_t cpumsf_counters[] = {
+ {
+ .ctrnum = 720896,
+ .ctrset = CPUMF_CTRSET_NONE,
+ .name = "SF_CYCLES_BASIC",
+ .desc = "Sample CPU cycles using basic-sampling mode",
+ },
+ {
+ .ctrnum = 774144,
+ .ctrset = CPUMF_CTRSET_NONE,
+ .name = "SF_CYCLES_BASIC_DIAG",
+ .desc = "Sample CPU cycle using diagnostic-sampling mode"
+ " (not for ordinary use)",
+ },
+};
+
#endif /* __S390X_CPUMF_EVENTS_H__ */
diff --git a/lib/pfmlib_common.c b/lib/pfmlib_common.c
index 861f475..987bae4 100644
--- a/lib/pfmlib_common.c
+++ b/lib/pfmlib_common.c
@@ -167,6 +167,7 @@ static pfmlib_pmu_t *pfmlib_pmus[]=
#endif
#ifdef CONFIG_PFMLIB_ARCH_S390X
&s390x_cpum_cf_support,
+ &s390x_cpum_sf_support,
#endif
#ifdef __linux__
&perf_event_support,
diff --git a/lib/pfmlib_priv.h b/lib/pfmlib_priv.h
index 287222d..530f68c 100644
--- a/lib/pfmlib_priv.h
+++ b/lib/pfmlib_priv.h
@@ -294,6 +294,7 @@ extern pfmlib_pmu_t arm_1176_support;
extern pfmlib_pmu_t arm_qcom_krait_support;
extern pfmlib_pmu_t mips_74k_support;
extern pfmlib_pmu_t s390x_cpum_cf_support;
+extern pfmlib_pmu_t s390x_cpum_sf_support;
extern pfmlib_os_t *pfmlib_os;
extern pfmlib_os_t pfmlib_os_perf;
diff --git a/lib/pfmlib_s390x_cpumf.c b/lib/pfmlib_s390x_cpumf.c
index e3aaaf0..db2a215 100644
--- a/lib/pfmlib_s390x_cpumf.c
+++ b/lib/pfmlib_s390x_cpumf.c
@@ -1,7 +1,7 @@
/*
- * PMU support for the CPU-measurement counter facility
+ * PMU support for the CPU-measurement facilities
*
- * Copyright IBM Corp. 2012
+ * Copyright IBM Corp. 2012, 2014
* Contributed by Hendrik Brueckner <brueck...@linux.vnet.ibm.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -34,17 +34,25 @@
#include "events/s390x_cpumf_events.h"
-#define CPUMF_DEVICE_DIR "/sys/bus/event_source/devices/cpum_cf"
-#define SYS_INFO "/proc/sysinfo"
+#define CPUM_CF_DEVICE_DIR "/sys/bus/event_source/devices/cpum_cf"
+#define CPUM_SF_DEVICE_DIR "/sys/bus/event_source/devices/cpum_sf"
+#define SYS_INFO "/proc/sysinfo"
/* CPU-measurement counter list (pmu events) */
static pme_cpumf_ctr_t *cpumcf_pe = NULL;
-/* Detect the CPU-measurement facility */
+/* Detect the CPU-measurement counter and sampling facilities */
static int pfm_cpumcf_detect(void *this)
{
- if (access(CPUMF_DEVICE_DIR, R_OK))
+ if (access(CPUM_CF_DEVICE_DIR, R_OK))
+ return PFM_ERR_NOTSUPP;
+ return PFM_SUCCESS;
+}
+
+static int pfm_cpumsf_detect(void *this)
+{
+ if (access(CPUM_SF_DEVICE_DIR, R_OK))
return PFM_ERR_NOTSUPP;
return PFM_SUCCESS;
}
@@ -156,7 +164,7 @@ static void pfm_cpumcf_exit(void *this)
free(cpumcf_pe);
}
-static int pfm_cpumcf_get_encoding(void *this, pfmlib_event_desc_t *e)
+static int pfm_cpumf_get_encoding(void *this, pfmlib_event_desc_t *e)
{
const pme_cpumf_ctr_t *pe = this_pe(this);
@@ -167,12 +175,12 @@ static int pfm_cpumcf_get_encoding(void *this,
pfmlib_event_desc_t *e)
return PFM_SUCCESS;
}
-static int pfm_cpumcf_get_event_first(void *this)
+static int pfm_cpumf_get_event_first(void *this)
{
return 0;
}
-static int pfm_cpumcf_get_event_next(void *this, int idx)
+static int pfm_cpumf_get_event_next(void *this, int idx)
{
pfmlib_pmu_t *pmu = this;
@@ -181,26 +189,20 @@ static int pfm_cpumcf_get_event_next(void *this, int idx)
return idx + 1;
}
-static int pfm_cpumcf_event_is_valid(void *this, int idx)
+static int pfm_cpumf_event_is_valid(void *this, int idx)
{
pfmlib_pmu_t *pmu = this;
return (idx >= 0 && idx < pmu->pme_count);
}
-static int pfm_cpumcf_validate_table(void *this, FILE *fp)
+static int pfm_cpumf_validate_table(void *this, FILE *fp)
{
pfmlib_pmu_t *pmu = this;
const pme_cpumf_ctr_t *pe = this_pe(this);
int i, rc;
rc = PFM_ERR_INVAL;
- if (pmu->pme_count > CPUMF_COUNTER_MAX) {
- fprintf(fp, "pmu: %s: pme number exceeded maximum\n",
- pmu->name);
- goto failed;
- }
-
for (i = 0; i < pmu->pme_count; i++) {
if (!pe[i].name) {
fprintf(fp, "pmu: %s event: %i: No name\n",
@@ -219,7 +221,20 @@ failed:
return rc;
}
-static int pfm_cpumcf_get_event_info(void *this, int idx,
+static int pfm_cpumcf_validate_table(void *this, FILE *fp)
+{
+ pfmlib_pmu_t *pmu = this;
+
+ if (pmu->pme_count > CPUMF_COUNTER_MAX) {
+ fprintf(fp, "pmu: %s: pme number exceeded maximum\n",
+ pmu->name);
+ return PFM_ERR_INVAL;
+ }
+
+ return pfm_cpumf_validate_table(this, fp);
+}
+
+static int pfm_cpumf_get_event_info(void *this, int idx,
pfm_event_info_t *info)
{
pfmlib_pmu_t *pmu = this;
@@ -238,7 +253,7 @@ static int pfm_cpumcf_get_event_info(void *this, int idx,
return PFM_SUCCESS;
}
-static int pfm_cpumcf_get_event_attr_info(void *this, int idx, int umask_idx,
+static int pfm_cpumf_get_event_attr_info(void *this, int idx, int umask_idx,
pfm_event_attr_info_t *info)
{
/* Attributes are not supported */
@@ -263,12 +278,38 @@ pfmlib_pmu_t s390x_cpum_cf_support = {
.pmu_init = pfm_cpumcf_init,
.pmu_terminate = pfm_cpumcf_exit,
- .get_event_encoding[PFM_OS_NONE] = pfm_cpumcf_get_encoding,
+ .get_event_encoding[PFM_OS_NONE] = pfm_cpumf_get_encoding,
PFMLIB_ENCODE_PERF(pfm_s390x_get_perf_encoding),
- .get_event_first = pfm_cpumcf_get_event_first,
- .get_event_next = pfm_cpumcf_get_event_next,
- .event_is_valid = pfm_cpumcf_event_is_valid,
+ .get_event_first = pfm_cpumf_get_event_first,
+ .get_event_next = pfm_cpumf_get_event_next,
+ .event_is_valid = pfm_cpumf_event_is_valid,
.validate_table = pfm_cpumcf_validate_table,
- .get_event_info = pfm_cpumcf_get_event_info,
- .get_event_attr_info = pfm_cpumcf_get_event_attr_info,
+ .get_event_info = pfm_cpumf_get_event_info,
+ .get_event_attr_info = pfm_cpumf_get_event_attr_info,
+};
+
+pfmlib_pmu_t s390x_cpum_sf_support = {
+ .desc = "CPU-measurement sampling facility",
+ .name = "cpum_sf",
+ .pmu = PFM_PMU_S390X_CPUM_SF,
+ .type = PFM_PMU_TYPE_CORE,
+ .flags = PFMLIB_PMU_FL_ARCH_DFL,
+
+ .num_cntrs = 0, /* no general-purpose counters */
+ .num_fixed_cntrs = 2, /* fixed counters only */
+ .max_encoding = 1,
+
+ .pe = cpumsf_counters,
+ .pme_count = LIBPFM_ARRAY_SIZE(cpumsf_counters),
+
+ .pmu_detect = pfm_cpumsf_detect,
+
+ .get_event_encoding[PFM_OS_NONE] = pfm_cpumf_get_encoding,
+ PFMLIB_ENCODE_PERF(pfm_s390x_get_perf_encoding),
+ .get_event_first = pfm_cpumf_get_event_first,
+ .get_event_next = pfm_cpumf_get_event_next,
+ .event_is_valid = pfm_cpumf_event_is_valid,
+ .validate_table = pfm_cpumf_validate_table,
+ .get_event_info = pfm_cpumf_get_event_info,
+ .get_event_attr_info = pfm_cpumf_get_event_attr_info,
};
--
1.7.5.4
------------------------------------------------------------------------------
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