linux-kernel - [PATCH 10/15] hwmon, fam15h_power: add compute unit accumulated power

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Date:	Thu, 27 Aug 2015 16:07:41 +0800
From:	Huang Rui <ray.huang@....com>
To:	Borislav Petkov <bp@...e.de>, Jean Delvare <jdelvare@...e.de>,
	"Guenter Roeck" <linux@...ck-us.net>,
	Andy Lutomirski <luto@...capital.net>,
	"Andreas Herrmann" <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
CC:	<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>,
	Huang Rui <ray.huang@....com>
Subject: [PATCH 10/15] hwmon, fam15h_power: add compute unit accumulated power

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

Signed-off-by: Huang Rui <ray.huang@....com>
---
 drivers/hwmon/fam15h_power.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index fdfa18e..f5ff48f 100644
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -43,7 +43,9 @@ MODULE_LICENSE("GPL");
 #define REG_TDP_LIMIT3			0xe8
 
 #define FAM15H_MIN_POWER_GROUPS		2
+#define MAX_CUS				8
 
+#define MSR_F15H_CU_PWR_ACCUMULATOR	0xc001007a
 #define MSR_F15H_CU_MAX_PWR_ACCUMULATOR	0xc001007b
 
 struct fam15h_power_data {
@@ -54,6 +56,8 @@ struct fam15h_power_data {
 	unsigned int cpu_pwr_sample_ratio;
 	/* maximum accumulated power of a compute unit */
 	u64 max_cu_acc_power;
+	/* accumulated power of the compute units */
+	u64 cu_acc_power[MAX_CUS];
 };
 
 static ssize_t show_power(struct device *dev,
@@ -207,6 +211,7 @@ static int fam15h_power_resume(struct pci_dev *pdev)
 static int fam15h_power_init_data(struct pci_dev *f4,
 				  struct fam15h_power_data *data)
 {
+	int cu_num, cores_per_cu, cpu, cu;
 	u32 val, eax, ebx, ecx, edx;
 	u64 tmp;
 
@@ -249,6 +254,21 @@ static int fam15h_power_init_data(struct pci_dev *f4,
 
 	data->max_cu_acc_power = tmp;
 
+	cores_per_cu = amd_get_cores_per_cu();
+	cu_num = boot_cpu_data.x86_max_cores / cores_per_cu;
+
+	WARN_ON_ONCE(cu_num > MAX_CUS);
+
+	for (cpu = 0; cpu < cu_num * cores_per_cu; cpu += cores_per_cu) {
+		cu = cpu / cores_per_cu;
+		if (rdmsrl_safe_on_cpu(cpu, MSR_F15H_CU_PWR_ACCUMULATOR,
+				       &data->cu_acc_power[cu])) {
+			pr_err("Failed to read compute unit power accumulator MSR on core%d\n",
+			       cpu);
+			return -ENODEV;
+		}
+	}
+
 	return 0;
 }
 
@@ -258,6 +278,7 @@ static int fam15h_power_probe(struct pci_dev *pdev,
 	struct fam15h_power_data *data;
 	struct device *dev = &pdev->dev;
 	struct device *hwmon_dev;
+	int ret;
 
 	/*
 	 * though we ignore every other northbridge, we still have to
@@ -273,11 +294,13 @@ static int fam15h_power_probe(struct pci_dev *pdev,
 	if (!data)
 		return -ENOMEM;
 
-	if (fam15h_power_init_attrs(pdev))
-		return -ENOMEM;
+	ret = fam15h_power_init_attrs(pdev);
+	if (ret)
+		return ret;
 
-	if (fam15h_power_init_data(pdev, data))
-		return -ENODEV;
+	ret = fam15h_power_init_data(pdev, data);
+	if (ret)
+		return ret;
 
 	data->pdev = pdev;
 
-- 
1.9.1

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