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Subject[PATCH 4/4] omap: cpu: Power tracking support for cgroup cpuacct
Date
Specify new power field in struct omap_opp, which is
power exported in milliWatt.

power_usage function gives power consumed in milliWatt seconds

Signed-off-by: Mike Chan <mike@android.com>
---
arch/arm/plat-omap/cpu-omap.c | 23 ++++++++++++++++++++++-
arch/arm/plat-omap/include/plat/omap-pm.h | 1 +
2 files changed, 23 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-omap/cpu-omap.c b/arch/arm/plat-omap/cpu-omap.c
index d27234d..1381539 100644
--- a/arch/arm/plat-omap/cpu-omap.c
+++ b/arch/arm/plat-omap/cpu-omap.c
@@ -22,6 +22,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/cpuacct.h>
+#include <linux/math64.h>

#include <mach/hardware.h>
#include <plat/clock.h>
@@ -218,10 +219,30 @@ static void omap_cpuacct_freq_show(void *cpuacct_data, struct cgroup_map_cb *cb)
}
}

+
+/* Returns power (in milliWatt seconds) for cgroup */
+static u64 omap_cpuacct_power_usage(void *cpuacct_data)
+{
+ int i;
+ u64 *cpuacct_freq = cpuacct_data;
+ u64 totalpower = 0;
+
+ /* mpu_opps table starts at 1 */
+ for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
+ totalpower += cpuacct_freq[i] * mpu_opps[i + 1].power;
+
+ /* milliwatt seconds */
+ totalpower = div64_u64(totalpower, NSEC_PER_SEC);
+
+ return totalpower;
+}
+
+
static struct cpuacct_cpufreq_calls omap_cpuacct_cpufreq = {
.init = omap_cpuacct_freq_init,
.charge = omap_cpuacct_freq_charge,
- .show = omap_cpuacct_freq_show,
+ .cpufreq_show = omap_cpuacct_freq_show,
+ .power_usage = omap_cpuacct_power_usage,
};

static int __init omap_cpuacct_init(void)
diff --git a/arch/arm/plat-omap/include/plat/omap-pm.h b/arch/arm/plat-omap/include/plat/omap-pm.h
index 3ee41d7..8f2db6f 100644
--- a/arch/arm/plat-omap/include/plat/omap-pm.h
+++ b/arch/arm/plat-omap/include/plat/omap-pm.h
@@ -31,6 +31,7 @@ struct omap_opp {
unsigned long rate;
u8 opp_id;
u16 min_vdd;
+ unsigned long power; /* power consumed running at OPP in milliWatts */
};

extern struct omap_opp *mpu_opps;
--
1.7.0.1


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