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PM / devfreq: memlat: add device attribute to show core to device bw map

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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>
This commit is contained in:
David Keitel 2016-09-13 15:41:52 -07:00
parent c5cfd3c491
commit 626da03683
1 changed files with 24 additions and 0 deletions
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24
drivers/devfreq/governor_memlat.c
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@ -81,6 +81,29 @@ show_attr(__attr) \
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)
{
@ -247,6 +270,7 @@ gov_attr(ratio_ceil, 1U, 10000U);
static struct attribute *dev_attr[] = {
&dev_attr_ratio_ceil.attr,
&dev_attr_freq_map.attr,
NULL,
};