powercap / RAPL: add support for ValleyView Soc
This patch adds support for RAPL on Intel ValleyView based SoC
platforms, such as Baytrail.
Besides adding CPU ID, special energy unit encoding is handled
for ValleyView.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 2a786c5..3c67683 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -833,6 +833,11 @@
return 0;
}
+static const struct x86_cpu_id energy_unit_quirk_ids[] = {
+ { X86_VENDOR_INTEL, 6, 0x37},/* VLV */
+ {}
+};
+
static int rapl_check_unit(struct rapl_package *rp, int cpu)
{
u64 msr_val;
@@ -853,8 +858,11 @@
* time unit: 1/time_unit_divisor Seconds
*/
value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
- rp->energy_unit_divisor = 1 << value;
-
+ /* some CPUs have different way to calculate energy unit */
+ if (x86_match_cpu(energy_unit_quirk_ids))
+ rp->energy_unit_divisor = 1000000 / (1 << value);
+ else
+ rp->energy_unit_divisor = 1 << value;
value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
rp->power_unit_divisor = 1 << value;
@@ -941,6 +949,7 @@
static const struct x86_cpu_id rapl_ids[] = {
{ X86_VENDOR_INTEL, 6, 0x2a},/* SNB */
{ X86_VENDOR_INTEL, 6, 0x2d},/* SNB EP */
+ { X86_VENDOR_INTEL, 6, 0x37},/* VLV */
{ X86_VENDOR_INTEL, 6, 0x3a},/* IVB */
{ X86_VENDOR_INTEL, 6, 0x45},/* HSW */
/* TODO: Add more CPU IDs after testing */
