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authorKajol Jain <kjain@linux.ibm.com>2020-07-09 10:48:36 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2020-07-16 13:12:41 +1000
commit792f73f747b82f6cb191a323e1f5755d33149b50 (patch)
tree2ee6387c0ad979f8ad4392463915273cd9b62461 /arch/powerpc/perf
parent1a8f0886a6008c98a926bdeca49f2ef33015a491 (diff)
powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show cpumask
Patch here adds a cpumask attr to hv_24x7 pmu along with ABI documentation. Primary use to expose the cpumask is for the perf tool which has the capability to parse the driver sysfs folder and understand the cpumask file. Having cpumask file will reduce the number of perf command line parameters (will avoid "-C" option in the perf tool command line). It can also notify the user which is the current cpu used to retrieve the counter data. command:# cat /sys/devices/hv_24x7/interface/cpumask 0 Signed-off-by: Kajol Jain <kjain@linux.ibm.com> Reviewed-by: Madhavan Srinivasan <maddy@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200709051836.723765-3-kjain@linux.ibm.com
Diffstat (limited to 'arch/powerpc/perf')
-rw-r--r--arch/powerpc/perf/hv-24x7.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 93b4700dcf8c..cdb7bfbd157e 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -448,6 +448,12 @@ static ssize_t device_show_string(struct device *dev,
return sprintf(buf, "%s\n", (char *)d->var);
}
+static ssize_t cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return cpumap_print_to_pagebuf(true, buf, &hv_24x7_cpumask);
+}
+
static ssize_t sockets_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -1115,6 +1121,7 @@ static DEVICE_ATTR_RO(domains);
static DEVICE_ATTR_RO(sockets);
static DEVICE_ATTR_RO(chipspersocket);
static DEVICE_ATTR_RO(coresperchip);
+static DEVICE_ATTR_RO(cpumask);
static struct bin_attribute *if_bin_attrs[] = {
&bin_attr_catalog,
@@ -1128,6 +1135,7 @@ static struct attribute *if_attrs[] = {
&dev_attr_sockets.attr,
&dev_attr_chipspersocket.attr,
&dev_attr_coresperchip.attr,
+ &dev_attr_cpumask.attr,
NULL,
};