[PATCH v2 08/32] perf/x86/intel/cqm: add pmu sysfs attribute

David Carrillo-Cisneros
2016-05-11T23:02:56Z

Expose max_recycle_threshold pmu attribute to user-space.

Reviewed-by: Stephane Eranian <eranian@google.com>
Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
---
arch/x86/events/intel/cqm.c | 48 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)

diff --git a/arch/x86/events/intel/cqm.c b/arch/x86/events/intel/cqm.c
index 54f219f..225b0c8 100644
--- a/arch/x86/events/intel/cqm.c
+++ b/arch/x86/events/intel/cqm.c
@@ -393,9 +393,57 @@ static struct attribute_group intel_cqm_format_group = {
.attrs = intel_cqm_formats_attr,
};

+static ssize_t
+max_recycle_threshold_show(
+ struct device *dev, struct device_attribute *attr, char *page)
+{
+ ssize_t rv;
+
+ monr_hrchy_acquire_mutexes();
+ rv = snprintf(page, PAGE_SIZE - 1, "%u\n",
+ __intel_cqm_max_threshold);
+ monr_hrchy_release_mutexes();
+
+ return rv;
+}
+
+static ssize_t
+max_recycle_threshold_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int bytes;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &bytes);
+ if (ret)
+ return ret;
+
+ /* Mutex waits for rotation logic in all packages to complete. */
+ monr_hrchy_acquire_mutexes();
+
+ __intel_cqm_max_threshold = bytes;
+
+ monr_hrchy_release_mutexes();
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(max_recycle_threshold);
+
+static struct attribute *intel_cqm_attrs[] = {
+ &dev_attr_max_recycle_threshold.attr,
+ NULL,
+};
+
+static const struct attribute_group intel_cqm_group = {
+ .attrs = intel_cqm_attrs,
+};
+
static const struct attribute_group *intel_cqm_attr_groups[] = {
&intel_cqm_events_group,
&intel_cqm_format_group,
+ &intel_cqm_group,
NULL,
};

--
2.8.0.rc3.226.g39d4020