PM / devfreq: memlat: add device attribute to show core to device bw map
This adds the freq_map device attribute to the mem_latency governor in
order to display a given device's core frequency to device bandwidth.
The output should be printed in the formatted in the same way as the
example:
Core freq (MHz) Device BW
300 1525
480 3143
900 4173
1017 7759
1296 9887
1555 11863
1804 13763
Change-Id: I6bef33a1239329f0687ee3983c2c02d84e984284
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
diff --git a/drivers/devfreq/governor_memlat.c b/drivers/devfreq/governor_memlat.c
index 53c6b89..e1afa60 100644
--- a/drivers/devfreq/governor_memlat.c
+++ b/drivers/devfreq/governor_memlat.c
@@ -81,6 +81,29 @@
store_attr(__attr, min, max) \
static DEVICE_ATTR(__attr, 0644, show_##__attr, store_##__attr)
+static ssize_t show_map(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct devfreq *df = to_devfreq(dev);
+ struct memlat_node *n = df->data;
+ struct core_dev_map *map = n->hw->freq_map;
+ unsigned int cnt = 0;
+
+ cnt += snprintf(buf, PAGE_SIZE, "Core freq (MHz)\tDevice BW\n");
+
+ while (map->core_mhz && cnt < PAGE_SIZE) {
+ cnt += snprintf(buf + cnt, PAGE_SIZE - cnt, "%15u\t%9u\n",
+ map->core_mhz, map->target_freq);
+ map++;
+ }
+ if (cnt < PAGE_SIZE)
+ cnt += snprintf(buf + cnt, PAGE_SIZE - cnt, "\n");
+
+ return cnt;
+}
+
+static DEVICE_ATTR(freq_map, 0444, show_map, NULL);
+
static unsigned long core_to_dev_freq(struct memlat_node *node,
unsigned long coref)
{
@@ -246,6 +269,7 @@
static struct attribute *dev_attr[] = {
&dev_attr_ratio_ceil.attr,
+ &dev_attr_freq_map.attr,
NULL,
};