[RFC 0/6] powerpc/perf: Add json file metric support for the hv_24x7 socket/chip level events

[RFC 0/6] powerpc/perf: Add json file metric support for the hv_24x7 socket/chip level events

[Kajol Jain]

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The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.

Patchset adds json file metric support for the hv_24x7 socket/chip level
events. "hv_24x7" pmu interface events needs system dependend parameter
like socket/chip/core. For example, hv_24x7 chip level events needs
specific chip-id to which the data is requested should be added as part
of pmu events.

So to enable JSON file support to "hv_24x7" interface, patchset expose
total number of sockets and chips per-socket details in sysfs
files (sockets, chips) under "/sys/devices/hv_24x7/interface/".

To get sockets and number of chips per sockets, patchset adds a rtas call
with token "PROCESSOR_MODULE_INFO" to get these details. Patchset also
handles partition migration case to re-init these system depended parameters
by adding proper calls in post_mobility_fixup() (mobility.c).

Patch 5 and 6 of the patchset handles perf tool plumbing needed to replace the "?"
character in the metric expression to proper value and hv_24x7 json metric file
for different Socket/chip resources.

Kajol Jain (6):
  powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor
    details
  powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show
    processor details
  Documentation/ABI: Add ABI documentation for chips and sockets
  powerpc/hv-24x7: Handle migration case of lpar for proper system
    information in sysfs
  perf/tools: Enhance JSON/metric infrastructure to handle "?"
  perf/tools/pmu-events/powerpc: Add hv_24x7 socket/chip level metric
    events

 .../sysfs-bus-event_source-devices-hv_24x7    |  14 +++
 arch/powerpc/perf/hv-24x7.c                   |  90 ++++++++++++++
 arch/powerpc/platforms/pseries/mobility.c     |  12 ++
 arch/powerpc/platforms/pseries/pseries.h      |   3 +
 tools/perf/arch/powerpc/util/header.c         |  40 ++++++
 .../arch/powerpc/power9/hv_24x7_metrics.json  |  64 ++++++++++
 tools/perf/util/expr.h                        |   1 +
 tools/perf/util/expr.y                        |  17 ++-
 tools/perf/util/metricgroup.c                 | 117 +++++++++++-------
 tools/perf/util/metricgroup.h                 |   1 +
 tools/perf/util/stat-shadow.c                 |   5 +
 11 files changed, 321 insertions(+), 43 deletions(-)
 create mode 100644 tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json

-- 
2.18.1

[RFC 1/6] powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor details

[Kajol Jain]

For hv_24x7 socket/chip level events, specific chip-id to which
the data requested should be added as part of pmu events.
But number of chips/socket in the system details are not exposed.

Patch implements read_sys_info_pseries() to get system
parameter values like number of sockets and chips per socket.
Rtas_call with token "PROCESSOR_MODULE_INFO"
is used to get these values.

Patch also make these parameters default to 1.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 arch/powerpc/perf/hv-24x7.c              | 68 ++++++++++++++++++++++++
 arch/powerpc/platforms/pseries/pseries.h |  3 ++
 2 files changed, 71 insertions(+)

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 573e0b309c0c..64d9fc526d68 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -19,6 +19,8 @@
 #include <asm/hvcall.h>
 #include <asm/io.h>
 #include <linux/byteorder/generic.h>
+#include <asm/rtas.h>
+#include <../../platforms/pseries/pseries.h>
 
 #include "hv-24x7.h"
 #include "hv-24x7-catalog.h"
@@ -57,6 +59,68 @@ static bool is_physical_domain(unsigned domain)
 	}
 }
 
+#ifdef CONFIG_PPC_RTAS
+#define PROCESSOR_MODULE_INFO   43
+#define PROCESSOR_MAX_LENGTH	(8 * 1024)
+
+static int strbe16toh(const char *buf, int offset)
+{
+	return (buf[offset] << 8) + buf[offset + 1];
+}
+
+static u32		physsockets;	/* Physical sockets */
+static u32		physchips;	/* Physical chips */
+
+/* Function read_sys_info_pseries() make a rtas_call which require
+ * data buffer of size 8K. As standard 'rtas_data_buf' is of size
+ * 4K, we are adding new local buffer 'rtas_local_data_buf'.
+ */
+char rtas_local_data_buf[PROCESSOR_MAX_LENGTH] __cacheline_aligned;
+
+/*
+ * read_sys_info_pseries()
+ * Retrieve the number of sockets and chips per socket details
+ * through the get-system-parameter rtas call.
+ */
+void read_sys_info_pseries(void)
+{
+	int call_status, len, ntypes;
+
+	/*
+	 * Making system parameter: chips and sockets default to 1.
+	 */
+	physsockets = 1;
+	physchips = 1;
+	memset(rtas_local_data_buf, 0, PROCESSOR_MAX_LENGTH);
+	spin_lock(&rtas_data_buf_lock);
+
+	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
+				NULL,
+				PROCESSOR_MODULE_INFO,
+				__pa(rtas_local_data_buf),
+				PROCESSOR_MAX_LENGTH);
+
+	spin_unlock(&rtas_data_buf_lock);
+
+	if (call_status != 0) {
+		pr_info("%s %s Error calling get-system-parameter (0x%x)\n",
+			__FILE__, __func__, call_status);
+	} else {
+		rtas_local_data_buf[PROCESSOR_MAX_LENGTH - 1] = '\0';
+		len = strbe16toh(rtas_local_data_buf, 0);
+		if (len < 6)
+			return;
+
+		ntypes = strbe16toh(rtas_local_data_buf, 2);
+
+		if (!ntypes)
+			return;
+		physsockets = strbe16toh(rtas_local_data_buf, 4);
+		physchips = strbe16toh(rtas_local_data_buf, 6);
+	}
+}
+#endif /* CONFIG_PPC_RTAS */
+
 /* Domains for which more than one result element are returned for each event. */
 static bool domain_needs_aggregation(unsigned int domain)
 {
@@ -1615,6 +1679,10 @@ static int hv_24x7_init(void)
 	if (r)
 		return r;
 
+#ifdef CONFIG_PPC_RTAS
+	read_sys_info_pseries();
+#endif
+
 	return 0;
 }
 
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 13fa370a87e4..1727559ce304 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -19,6 +19,9 @@ extern void request_event_sources_irqs(struct device_node *np,
 struct pt_regs;
 
 extern int pSeries_system_reset_exception(struct pt_regs *regs);
+#ifdef CONFIG_PPC_RTAS
+extern void read_sys_info_pseries(void);
+#endif
 extern int pSeries_machine_check_exception(struct pt_regs *regs);
 extern long pseries_machine_check_realmode(struct pt_regs *regs);
 
-- 
2.18.1

[RFC 2/6] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show processor details

[Kajol Jain]

To expose the system dependent parameter like total number of
sockets and numbers of chips per socket, patch adds two sysfs files.
"sockets" and "chips" are added to /sys/devices/hv_24x7/interface/
of the "hv_24x7" pmu.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 arch/powerpc/perf/hv-24x7.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 64d9fc526d68..e498824eb4f7 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -450,6 +450,20 @@ static ssize_t device_show_string(struct device *dev,
 	return sprintf(buf, "%s\n", (char *)d->var);
 }
 
+#ifdef CONFIG_PPC_RTAS
+static ssize_t sockets_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", physsockets);
+}
+
+static ssize_t chips_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	return sprintf(buf, "%d\n", physchips);
+}
+#endif
+
 static struct attribute *device_str_attr_create_(char *name, char *str)
 {
 	struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
@@ -1096,6 +1110,10 @@ PAGE_0_ATTR(catalog_len, "%lld\n",
 		(unsigned long long)be32_to_cpu(page_0->length) * 4096);
 static BIN_ATTR_RO(catalog, 0/* real length varies */);
 static DEVICE_ATTR_RO(domains);
+#ifdef CONFIG_PPC_RTAS
+static DEVICE_ATTR_RO(sockets);
+static DEVICE_ATTR_RO(chips);
+#endif
 
 static struct bin_attribute *if_bin_attrs[] = {
 	&bin_attr_catalog,
@@ -1106,6 +1124,10 @@ static struct attribute *if_attrs[] = {
 	&dev_attr_catalog_len.attr,
 	&dev_attr_catalog_version.attr,
 	&dev_attr_domains.attr,
+#ifdef CONFIG_PPC_RTAS
+	&dev_attr_sockets.attr,
+	&dev_attr_chips.attr,
+#endif
 	NULL,
 };
 
-- 
2.18.1

[RFC 3/6] Documentation/ABI: Add ABI documentation for chips and sockets

[Kajol Jain]

Add documentation for the following sysfs files:
/sys/devices/hv_24x7/interface/chips,
/sys/devices/hv_24x7/interface/sockets

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 .../testing/sysfs-bus-event_source-devices-hv_24x7 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_24x7 b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_24x7
index ec27c6c9e737..e26cb1770c61 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_24x7
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_24x7
@@ -22,6 +22,20 @@ Description:
 		Exposes the "version" field of the 24x7 catalog. This is also
 		extractable from the provided binary "catalog" sysfs entry.
 
+What:		/sys/devices/hv_24x7/interface/sockets
+Date:		December 2019
+Contact:	Linux on PowerPC Developer List <linuxppc-dev@lists.ozlabs.org>
+Description:	read only
+		This sysfs interface exposes the number of sockets present in the
+		system.
+
+What:		/sys/devices/hv_24x7/interface/chips
+Date:		December 2019
+Contact:	Linux on PowerPC Developer List <linuxppc-dev@lists.ozlabs.org>
+Description:	read only
+		This sysfs interface exposes the number of chips per socket
+		present in the system.
+
 What:		/sys/bus/event_source/devices/hv_24x7/event_descs/<event-name>
 Date:		February 2014
 Contact:	Linux on PowerPC Developer List <linuxppc-dev@lists.ozlabs.org>
-- 
2.18.1

[RFC 4/6] powerpc/hv-24x7: Handle migration case of lpar for proper system information in sysfs

[Kajol Jain]

Function 'read_sys_info_pseries()' is added to get system parameter
values like number of sockets and chips per socket.
and it gets these details via rtas_call with token
"PROCESSOR_MODULE_INFO".

Incase lpar migrate from one system to another, system
parameter details like chips per sockets or number of sockets might
change. So, it needs to be re-initialized otherwise, these values
corresponds to previous system values.
This patch adds a call to 'read_sys_info_pseries()' from
'post-mobility_fixup()' to re-init the physsockets and physchips values.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/mobility.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index b571285f6c14..226accd6218b 100644
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -371,6 +371,18 @@ void post_mobility_fixup(void)
 	/* Possibly switch to a new RFI flush type */
 	pseries_setup_rfi_flush();
 
+	/*
+	 * Incase lpar migrate from one system to another, system
+	 * parameter details like chips per sockets and number of sockets
+	 * might change. So, it needs to be re-initialized otherwise these
+	 * values corresponds to previous system.
+	 * Here, adding a call to read_sys_info_pseries() declared in
+	 * platforms/pseries/pseries.h to re-init the physsockets and
+	 * physchips value.
+	 */
+	if (IS_ENABLED(CONFIG_HV_PERF_CTRS) && IS_ENABLED(CONFIG_PPC_RTAS))
+		read_sys_info_pseries();
+
 	return;
 }
 
-- 
2.18.1

[RFC 5/6] perf/tools: Enhance JSON/metric infrastructure to handle "?"

[Kajol Jain]

Patch enhances current metric infrastructure to handle "?" in the metric
expression. The "?" can be use for parameters whose value not known while
creating metric events and which can be replace later at runtime to
the proper value. It also add flexibility to create multiple events out
of single metric event added in json file.

Patch adds function 'arch_get_runtimeparam' which is a arch specific
function, returns the count of metric events need to be created.
By default it return 1.

One loop is added in function 'metricgroup__add_metric', which create
multiple events at run time depend on return value of
'arch_get_runtimeparam' and merge that event in 'group_list'.

This infrastructure needed for hv_24x7 socket/chip level events.
"hv_24x7" chip level events needs specific chip-id to which the
data is requested. Function 'arch_get_runtimeparam' implemented
in header.c which extract number of sockets from sysfs file
"sockets" under "/sys/devices/hv_24x7/interface/".

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 tools/perf/arch/powerpc/util/header.c |  40 +++++++++
 tools/perf/util/expr.h                |   1 +
 tools/perf/util/expr.y                |  17 +++-
 tools/perf/util/metricgroup.c         | 117 +++++++++++++++++---------
 tools/perf/util/metricgroup.h         |   1 +
 tools/perf/util/stat-shadow.c         |   5 ++
 6 files changed, 138 insertions(+), 43 deletions(-)

diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index 3b4cdfc5efd6..28425edb901c 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -7,6 +7,11 @@
 #include <string.h>
 #include <linux/stringify.h>
 #include "header.h"
+#include "metricgroup.h"
+#include "evlist.h"
+#include <dirent.h>
+#include "pmu.h"
+#include <api/fs/fs.h>
 
 #define mfspr(rn)       ({unsigned long rval; \
 			 asm volatile("mfspr %0," __stringify(rn) \
@@ -16,6 +21,8 @@
 #define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
 #define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
 
+#define SOCKETS_INFO_FILE_PATH "/devices/hv_24x7/interface/"
+
 int
 get_cpuid(char *buffer, size_t sz)
 {
@@ -44,3 +51,36 @@ get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
 
 	return bufp;
 }
+
+int arch_get_runtimeparam(void)
+{
+	int count = 0;
+	DIR *dir;
+	char path[PATH_MAX];
+	const char *sysfs = sysfs__mountpoint();
+	char filename[] = "sockets";
+	FILE *file;
+	char buf[16], *num;
+	int data;
+
+	if (!sysfs)
+		goto out;
+	snprintf(path, PATH_MAX,
+		 "%s" SOCKETS_INFO_FILE_PATH, sysfs);
+	dir = opendir(path);
+	if (!dir)
+		goto out;
+	strcat(path, filename);
+	file = fopen(path, "r");
+	if (!file)
+		goto out;
+
+	data = fread(buf, 1, sizeof(buf), file);
+	if (data == 0)
+		goto out;
+	count = strtol(buf, &num, 10);
+out:
+	if (!count)
+		count = 1;
+	return count;
+}
diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
index 046160831f90..85ebea68b0c5 100644
--- a/tools/perf/util/expr.h
+++ b/tools/perf/util/expr.h
@@ -15,6 +15,7 @@ struct parse_ctx {
 	struct parse_id ids[MAX_PARSE_ID];
 };
 
+extern int expr__runtimeparam;
 void expr__ctx_init(struct parse_ctx *ctx);
 void expr__add_id(struct parse_ctx *ctx, const char *id, double val);
 #ifndef IN_EXPR_Y
diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index f9a20a39b64a..26c62b631525 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -36,6 +36,8 @@
 %type <num> expr if_expr
 
 %{
+int expr__runtimeparam;
+
 static int expr__lex(YYSTYPE *res, const char **pp);
 
 static void expr__error(double *final_val __maybe_unused,
@@ -101,7 +103,7 @@ static int expr__symbol(YYSTYPE *res, const char *p, const char **pp)
 	if (*p == '#')
 		*dst++ = *p++;
 
-	while (isalnum(*p) || *p == '_' || *p == '.' || *p == ':' || *p == '@' || *p == '\\') {
+	while (isalnum(*p) || *p == '_' || *p == '.' || *p == ':' || *p == '@' || *p == '\\' || *p == '?') {
 		if (p - s >= MAXIDLEN)
 			return -1;
 		/*
@@ -112,6 +114,19 @@ static int expr__symbol(YYSTYPE *res, const char *p, const char **pp)
 			*dst++ = '/';
 		else if (*p == '\\')
 			*dst++ = *++p;
+		else if (*p == '?') {
+			int size = snprintf(NULL, 0, "%d", expr__runtimeparam);
+			char * paramval = (char *)malloc(size);
+			int i = 0;
+			if(!paramval)
+				*dst++ = '0';
+			else {
+				sprintf(paramval, "%d", expr__runtimeparam);
+				while(i < size)
+					*dst++ = paramval[i++];
+				free(paramval);
+			}
+		}
 		else
 			*dst++ = *p;
 		p++;
diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 02aee946b6c1..ec87a120cd7e 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -399,6 +399,11 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
 	strlist__delete(metriclist);
 }
 
+int __weak arch_get_runtimeparam(void)
+{
+	return 1;
+}
+
 static int metricgroup__add_metric(const char *metric, struct strbuf *events,
 				   struct list_head *group_list)
 {
@@ -419,52 +424,80 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
 			continue;
 		if (match_metric(pe->metric_group, metric) ||
 		    match_metric(pe->metric_name, metric)) {
-			const char **ids;
-			int idnum;
-			struct egroup *eg;
-			bool no_group = false;
-
-			pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
-
-			if (expr__find_other(pe->metric_expr,
-					     NULL, &ids, &idnum) < 0)
-				continue;
-			if (events->len > 0)
-				strbuf_addf(events, ",");
-			for (j = 0; j < idnum; j++) {
-				pr_debug("found event %s\n", ids[j]);
-				/*
-				 * Duration time maps to a software event and can make
-				 * groups not count. Always use it outside a
-				 * group.
-				 */
-				if (!strcmp(ids[j], "duration_time")) {
-					if (j > 0)
-						strbuf_addf(events, "}:W,");
-					strbuf_addf(events, "duration_time");
-					no_group = true;
+			int k, count;
+
+			count = arch_get_runtimeparam();
+
+			/* This loop is added to create multiple
+			 * events depend on count value and add
+			 * those events to group_list.
+			 */
+			for (k = 0; k < count; k++) {
+				const char **ids;
+				int idnum;
+				struct egroup *eg;
+				bool no_group = false;
+				char value[PATH_MAX];
+
+				pr_debug("metric expr %s for %s\n",
+					 pe->metric_expr, pe->metric_name);
+				expr__runtimeparam = k;
+				if (expr__find_other(pe->metric_expr, NULL,
+						     &ids, &idnum) < 0)
 					continue;
+				if (events->len > 0)
+					strbuf_addf(events, ",");
+				for (j = 0; j < idnum; j++) {
+					pr_debug("found event %s\n", ids[j]);
+					/*
+					 * Duration time maps to a software
+					 * event and can make groups not count.
+					 * Always use it outside a group.
+					 */
+					if (!strcmp(ids[j], "duration_time")) {
+						if (j > 0)
+							strbuf_addf(events,
+								    "}:W,");
+						strbuf_addf(events,
+							    "duration_time");
+						no_group = true;
+						continue;
+					}
+					strbuf_addf(events, "%s%s",
+						    j == 0 || no_group ? "{" :
+						    ",", ids[j]);
+					no_group = false;
 				}
-				strbuf_addf(events, "%s%s",
-					j == 0 || no_group ? "{" : ",",
-					ids[j]);
-				no_group = false;
-			}
-			if (!no_group)
-				strbuf_addf(events, "}:W");
+				if (!no_group)
+					strbuf_addf(events, "}:W");
 
-			eg = malloc(sizeof(struct egroup));
-			if (!eg) {
-				ret = -ENOMEM;
-				break;
+				eg = malloc(sizeof(struct egroup));
+				if (!eg) {
+					ret = -ENOMEM;
+					break;
+				}
+				eg->ids = ids;
+				eg->idnum = idnum;
+				strcpy(value, pe->metric_name);
+				if (strstr(pe->metric_name, "?")) {
+					int size = snprintf(NULL, 0, "%d", k);
+					char *param = (char *)malloc(size + 1);
+
+					if (!param) {
+						strcat(value, "_0");
+					} else {
+						sprintf(param, "%c%d", '_', k);
+						value[strlen(value) - 1] = '\0';
+						strcat(value, param);
+						free(param);
+					}
+				}
+				eg->metric_name = strdup(value);
+				eg->metric_expr = pe->metric_expr;
+				eg->metric_unit = pe->unit;
+				list_add_tail(&eg->nd, group_list);
+				ret = 0;
 			}
-			eg->ids = ids;
-			eg->idnum = idnum;
-			eg->metric_name = pe->metric_name;
-			eg->metric_expr = pe->metric_expr;
-			eg->metric_unit = pe->unit;
-			list_add_tail(&eg->nd, group_list);
-			ret = 0;
 		}
 	}
 	return ret;
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index 475c7f912864..81224ba1270d 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -34,4 +34,5 @@ int metricgroup__parse_groups(const struct option *opt,
 void metricgroup__print(bool metrics, bool groups, char *filter,
 			bool raw, bool details);
 bool metricgroup__has_metric(const char *metric);
+int arch_get_runtimeparam(void);
 #endif
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 2c41d47f6f83..147a39b1ff5b 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -780,7 +780,12 @@ static void generic_metric(struct perf_stat_config *config,
 
 	if (!metric_events[i]) {
 		const char *p = metric_expr;
+		if (strstr(p, "?")) {
+			char *tmp = strrchr(metric_name, '_');
 
+			tmp++;
+			expr__runtimeparam = strtol(tmp, &tmp, 10);
+		}
 		if (expr__parse(&ratio, &pctx, &p) == 0) {
 			char *unit;
 			char metric_bf[64];
-- 
2.18.1

Re: [RFC 5/6] perf/tools: Enhance JSON/metric infrastructure to handle "?"

[Andi Kleen]

On Fri, Jan 17, 2020 at 06:16:19PM +0530, Kajol Jain wrote:
> Patch enhances current metric infrastructure to handle "?" in the metric
> expression. The "?" can be use for parameters whose value not known while
> creating metric events and which can be replace later at runtime to
> the proper value. It also add flexibility to create multiple events out
> of single metric event added in json file.

Please add a proper specification how this ? thing is supposed to work,
what the exact semantics are, how it is different from the existing
# mechanism etc.

The standard way to do similar things before was to define an explicit
# name and let the expr code take care of it. 

-Andi 

Re: [RFC 5/6] perf/tools: Enhance JSON/metric infrastructure to handle "?"

[kajoljain]

On 1/17/20 9:58 PM, Andi Kleen wrote:
> On Fri, Jan 17, 2020 at 06:16:19PM +0530, Kajol Jain wrote:
>> Patch enhances current metric infrastructure to handle "?" in the metric
>> expression. The "?" can be use for parameters whose value not known while
>> creating metric events and which can be replace later at runtime to
>> the proper value. It also add flexibility to create multiple events out
>> of single metric event added in json file.
> Please add a proper specification how this ? thing is supposed to work,
> what the exact semantics are, how it is different from the existing
> # mechanism etc.
>
> The standard way to do similar things before was to define an explicit
> # name and let the expr code take care of it.

Hi Andi,

     Thanks for reviewing my patchset.

I did review the existing '#' mechanism. It is quiet useful for runtime
dependency (like ex. event selection based on a return value). But I want
to handle couple of more things. Meaning, filling in parameter of event code
based on runtime value and replicating events at runtime.

So the '?' can handle, 1) replacement of a value in the event code based 
on runtime

and 2) replicate the event (metric expr) at runtime (handled in new 
metricgroup__add_metric()).

This patchset add an arch specific function called 
'arch_get_runtimeparam'. Ideally,
arch_get_runtimeparm() returns the number of metric exps one want to 
create (it defaults to 1).
The loop added in 'metricgroup__add_metric' will handle the event addition.

Example ppc64 hv_24x7 pmu metric event using '?':

(hv_24x7@PM_MCS01_128B_RD_DISP_PORT01\\,chip\\=?@ + 
hv_24x7@PM_MCS01_128B_RD_DISP_PORT23\\,chip\\=?@)

Here, '?' will be replaced with a runtime value and metric expression 
will be replicated.

Thanks,

Kajol

> -Andi

Re: [RFC 5/6] perf/tools: Enhance JSON/metric infrastructure to handle "?"

[Andi Kleen]

> Here, '?' will be replaced with a runtime value and metric expression will
> be replicated.

Okay seems reasonable to me.

Thanks,

-Andi

[RFC 6/6] perf/tools/pmu-events/powerpc: Add hv_24x7 socket/chip level metric events

[Kajol Jain]

The hv_24×7 feature in IBM® POWER9™ processor-based servers provide the
facility to continuously collect large numbers of hardware performance
metrics efficiently and accurately.
This patch adds hv_24x7 json metric file for different Socket/chip
resources.

Result:

power9 platform:

command:# ./perf stat --metric-only -M Memory_RD_BW_Chip? -C 0
	   -I 1000 sleep 1

time MB       Memory_RD_BW_Chip_0 MB   Memory_RD_BW_Chip_1 MB
1.000192635                      0.4                      0.0
1.001695883                      0.0                      0.0

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 .../arch/powerpc/power9/hv_24x7_metrics.json  | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json

diff --git a/tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json b/tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json
new file mode 100644
index 000000000000..52d0116e61c2
--- /dev/null
+++ b/tools/perf/pmu-events/arch/powerpc/power9/hv_24x7_metrics.json
@@ -0,0 +1,64 @@
+[
+    {
+        "MetricExpr": "(hv_24x7@PM_MCS01_128B_RD_DISP_PORT01\\,chip\\=?@ + hv_24x7@PM_MCS01_128B_RD_DISP_PORT23\\,chip\\=?@ + hv_24x7@PM_MCS23_128B_RD_DISP_PORT01\\,chip\\=?@ + hv_24x7@PM_MCS23_128B_RD_DISP_PORT23\\,chip\\=?@)",
+        "MetricName": "Memory_RD_BW_Chip?",
+        "MetricGroup": "Memory_BW",
+        "ScaleUnit": "1.6e-2MB"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_MCS01_128B_WR_DISP_PORT01\\,chip\\=?@ + hv_24x7@PM_MCS01_128B_WR_DISP_PORT23\\,chip\\=?@ + hv_24x7@PM_MCS23_128B_WR_DISP_PORT01\\,chip\\=?@ + hv_24x7@PM_MCS23_128B_WR_DISP_PORT23\\,chip\\=?@ )",
+        "MetricName": "Memory_WR_BW_Chip?",
+        "MetricGroup": "Memory_BW",
+        "ScaleUnit": "1.6e-2MB"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK0_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK0_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS0_OUT_DATA_THRUPUT?",
+        "ScaleUnit": "6.5e-2MB"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK0_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK0_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS0_OUT_DATA_UTILIZATION?",
+        "ScaleUnit": "53.125%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK0_OUT_ODD_TOTAL_UTIL\\,chip\\=?@ + hv_24x7@PM_XLINK0_OUT_EVEN_TOTAL_UTIL\\,chip\\=?@ )",
+        "MetricName": "XBUS0_OUT_TOTAL_UTILIZATION?",
+        "ScaleUnit": "50%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK1_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK1_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS1_OUT_DATA_THRUPUT?",
+        "ScaleUnit": "6.5e-2MB"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK1_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK1_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS1_OUT_DATA_UTILIZATION?",
+        "ScaleUnit": "53.125%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK1_OUT_ODD_TOTAL_UTIL\\,chip\\=?@ + hv_24x7@PM_XLINK1_OUT_EVEN_TOTAL_UTIL\\,chip\\=?@ )",
+        "MetricName": "XBUS1_OUT_TOTAL_UTILIZATION?",
+        "ScaleUnit": "50%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK2_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK2_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS2_OUT_DATA_THRUPUT?",
+        "ScaleUnit": "6.5e-2MB"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK2_OUT_ODD_DATA_COUNT\\,chip\\=?@ + hv_24x7@PM_XLINK2_OUT_EVEN_DATA_COUNT\\,chip\\=?@ )",
+        "MetricName": "XBUS2_OUT_DATA_UTILIZATION?",
+        "ScaleUnit": "53.125%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_XLINK2_OUT_ODD_TOTAL_UTIL\\,chip\\=?@ + hv_24x7@PM_XLINK2_OUT_EVEN_TOTAL_UTIL\\,chip\\=?@ )",
+        "MetricName": "XBUS2_OUT_TOTAL_UTILIZATION?",
+        "ScaleUnit": "50%"
+    },
+    {
+    "MetricExpr": "(hv_24x7@PM_PB_CYC\\,chip\\=?@ )",
+        "MetricName": "PowerBUS_Frequency?",
+        "ScaleUnit": "2.56e-7GHz"
+    }
+]
-- 
2.18.1