hwmon: (fam15h_power) Add max compute unit accumulated power

This patch adds a member in fam15h_power_data which specifies the
maximum accumulated power in a compute unit.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index a46e166cdd7e95a3f6b627f4751224115d8b7ce0..5f7067d7b625c6578c4b135becd159d50e8b0eee 100644 (file)
--- 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;
 }