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-rw-r--r--drivers/hwmon/fam15h_power.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index a46e166cdd7e..5f7067d7b625 100644
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -26,6 +26,7 @@
#include <linux/pci.h>
#include <linux/bitops.h>
#include <asm/processor.h>
+#include <asm/msr.h>
MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
@@ -44,6 +45,8 @@ MODULE_LICENSE("GPL");
#define FAM15H_MIN_NUM_ATTRS 2
#define FAM15H_NUM_GROUPS 2
+#define MSR_F15H_CU_MAX_PWR_ACCUMULATOR 0xc001007b
+
struct fam15h_power_data {
struct pci_dev *pdev;
unsigned int tdp_to_watts;
@@ -52,6 +55,8 @@ struct fam15h_power_data {
unsigned int cpu_pwr_sample_ratio;
const struct attribute_group *groups[FAM15H_NUM_GROUPS];
struct attribute_group group;
+ /* maximum accumulated power of a compute unit */
+ u64 max_cu_acc_power;
};
static ssize_t show_power(struct device *dev,
@@ -241,6 +246,13 @@ static int fam15h_power_init_data(struct pci_dev *f4,
*/
data->cpu_pwr_sample_ratio = ecx;
+ if (rdmsrl_safe(MSR_F15H_CU_MAX_PWR_ACCUMULATOR, &tmp)) {
+ pr_err("Failed to read max compute unit power accumulator MSR\n");
+ return -ENODEV;
+ }
+
+ data->max_cu_acc_power = tmp;
+
return 0;
}