[PATCHv1 1/1]Hwmon: Add core/pkg Threshold Support to Coretemp

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This patch adds the core and pkg support to coretemp.
These thresholds can be configured via the sysfs interfaces tempX_max
and tempX_max_hyst. An interrupt is generated when CPU temperature reaches
or crosses above tempX_max OR drops below tempX_max_hyst.

This patch is based on the documentation in sec:14.5 of IA Manual vol 3A,
that can be downloaded from here:
http://download.intel.com/design/processor/manuals/253668.pdf

Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
---
 Documentation/hwmon/coretemp |    7 ++
 drivers/hwmon/coretemp.c     |  135 ++++++++++++++++++++++++++++++++----------
 2 files changed, 110 insertions(+), 32 deletions(-)

diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index f85e913..fa8776a 100644
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -35,6 +35,13 @@ the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 All Sysfs entries are named with their core_id (represented here by 'X').
 tempX_input	 - Core temperature (in millidegrees Celsius).
 tempX_max	 - All cooling devices should be turned on (on Core2).
+		   Initialized with IA32_THERM_INTERRUPT. When the CPU
+		   temperature reaches this temperature, an interrupt is
+		   generated and tempX_max_alarm is set.
+tempX_max_hyst   - If the CPU temperature falls below than temperature,
+		   an interrupt is generated and tempX_max_alarm is reset.
+tempX_max_alarm  - Set if the temperature reaches or exceeds tempX_max.
+		   Reset if the temperature drops to or below tempX_max_hyst.
 tempX_crit	 - Maximum junction temperature (in millidegrees Celsius).
 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
 		   Correct CPU operation is no longer guaranteed.
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index de3d246..c155ae2 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -44,7 +44,7 @@
 #define BASE_SYSFS_ATTR_NO	2	/* Sysfs Base attr no for coretemp */
 #define NUM_REAL_CORES		16	/* Number of Real cores per cpu */
 #define CORETEMP_NAME_LENGTH	17	/* String Length of attrs */
-#define MAX_ATTRS		5	/* Maximum no of per-core attrs */
+#define MAX_ATTRS		7	/* Maximum no of per-core attrs */
 #define MAX_CORE_DATA		(NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
 
 #ifdef CONFIG_SMP
@@ -74,11 +74,13 @@
 struct temp_data {
 	int temp;
 	int ttarget;
+	int tmin;
 	int tjmax;
 	unsigned long last_updated;
 	unsigned int cpu;
 	u32 cpu_core_id;
 	u32 status_reg;
+	u32 intrpt_reg;
 	bool is_pkg_data;
 	bool valid;
 	struct sensor_device_attribute sd_attrs[MAX_ATTRS];
@@ -137,6 +139,22 @@ static ssize_t show_crit_alarm(struct device *dev,
 	return sprintf(buf, "%d\n", (eax >> 5) & 1);
 }
 
+static ssize_t show_max_alarm(struct device *dev,
+				struct device_attribute *devattr, char *buf)
+{
+	u32 eax, edx;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct platform_data *pdata = dev_get_drvdata(dev);
+	struct temp_data *tdata = pdata->core_data[attr->index];
+
+	rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
+
+	if (eax & THERM_LOG_THRESHOLD1)
+		return sprintf(buf, "1\n");
+
+	return sprintf(buf, "0\n");
+}
+
 static ssize_t show_tjmax(struct device *dev,
 			struct device_attribute *devattr, char *buf)
 {
@@ -155,6 +173,69 @@ static ssize_t show_ttarget(struct device *dev,
 	return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
 }
 
+static ssize_t store_ttarget(struct device *dev,
+				struct device_attribute *devattr,
+				const char *buf, size_t count)
+{
+	struct platform_data *pdata = dev_get_drvdata(dev);
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct temp_data *tdata = pdata->core_data[attr->index];
+	u32 eax, edx;
+	unsigned long val;
+	int diff;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	diff = (tdata->tjmax - val) / 1000;
+
+	mutex_lock(&tdata->update_lock);
+	rdmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, &eax, &edx);
+	eax = (eax & ~THERM_MASK_THRESHOLD1) |
+				(diff << THERM_SHIFT_THRESHOLD1);
+	wrmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, eax, edx);
+	tdata->ttarget = val;
+	mutex_unlock(&tdata->update_lock);
+
+	return count;
+}
+
+static ssize_t show_tmin(struct device *dev,
+			struct device_attribute *devattr, char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct platform_data *pdata = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tmin);
+}
+
+static ssize_t store_tmin(struct device *dev,
+				struct device_attribute *devattr,
+				const char *buf, size_t count)
+{
+	struct platform_data *pdata = dev_get_drvdata(dev);
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct temp_data *tdata = pdata->core_data[attr->index];
+	u32 eax, edx;
+	unsigned long val;
+	int diff;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	diff = (tdata->tjmax - val) / 1000;
+
+	mutex_lock(&tdata->update_lock);
+	rdmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, &eax, &edx);
+	eax = (eax & ~THERM_MASK_THRESHOLD0) |
+				(diff << THERM_SHIFT_THRESHOLD0);
+	wrmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, eax, edx);
+	tdata->tmin = val;
+	mutex_unlock(&tdata->update_lock);
+
+	return count;
+}
+
 static ssize_t show_temp(struct device *dev,
 			struct device_attribute *devattr, char *buf)
 {
@@ -364,11 +445,16 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
 	static ssize_t (*rd_ptr[MAX_ATTRS]) (struct device *dev,
 			struct device_attribute *devattr, char *buf) = {
 			show_label, show_crit_alarm, show_ttarget,
-			show_temp, show_tjmax };
+			show_temp, show_tjmax, show_tmin, show_max_alarm };
+	static ssize_t (*rw_ptr[MAX_ATTRS]) (struct device *dev,
+			struct device_attribute *devattr, const char *buf,
+			size_t count) = { NULL, NULL, store_ttarget, NULL,
+			NULL, store_tmin, NULL };
 	static const char *names[MAX_ATTRS] = {
 					"temp%d_label", "temp%d_crit_alarm",
 					"temp%d_max", "temp%d_input",
-					"temp%d_crit" };
+					"temp%d_crit", "temp%d_max_hyst",
+					"temp%d_max_alarm" };
 
 	for (i = 0; i < MAX_ATTRS; i++) {
 		snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i],
@@ -376,8 +462,10 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
 		sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
 		tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
 		tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
+		if (rw_ptr[i])
+			tdata->sd_attrs[i].dev_attr.attr.mode |= S_IWUSR;
 		tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
-		tdata->sd_attrs[i].dev_attr.store = NULL;
+		tdata->sd_attrs[i].dev_attr.store = rw_ptr[i];
 		tdata->sd_attrs[i].index = attr_no;
 		err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr);
 		if (err)
@@ -391,37 +479,18 @@ exit_free:
 	return err;
 }
 
-static void update_ttarget(__u8 cpu_model, struct temp_data *tdata,
-				struct device *dev)
+static void get_ttarget(struct temp_data *tdata, struct device *dev)
 {
 	int err;
 	u32 eax, edx;
 
-	/*
-	 * Initialize ttarget value. Eventually this will be
-	 * initialized with the value from MSR_IA32_THERM_INTERRUPT
-	 * register. If IA32_TEMPERATURE_TARGET is supported, this
-	 * value will be over written below.
-	 * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT
-	 */
-	tdata->ttarget = tdata->tjmax - 20000;
-
-	/*
-	 * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists
-	 * on older CPUs but not in this register,
-	 * Atoms don't have it either.
-	 */
-	if (cpu_model > 0xe && cpu_model != 0x1c) {
-		err = rdmsr_safe_on_cpu(tdata->cpu,
-				MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
-		if (err) {
-			dev_warn(dev,
-			"Unable to read IA32_TEMPERATURE_TARGET MSR\n");
-		} else {
-			tdata->ttarget = tdata->tjmax -
-					((eax >> 8) & 0xff) * 1000;
-		}
-	}
+	/* Initialize ttarget with bits 16:22 of MSR_IA32_THERM_INTERRUPT */
+	err = rdmsr_safe_on_cpu(tdata->cpu, MSR_IA32_THERM_INTERRUPT,
+				&eax, &edx);
+	if (err)
+		dev_warn(dev, "unable to read MSR_IA32_THERM_INTERRUPT\n");
+	else
+		tdata->ttarget = tdata->tjmax - ((eax >> 16) & 0x7f) * 1000;
 }
 
 static int __devinit chk_ucode_version(struct platform_device *pdev)
@@ -481,6 +550,8 @@ static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
 
 	tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
 							MSR_IA32_THERM_STATUS;
+	tdata->intrpt_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_INTERRUPT :
+						MSR_IA32_THERM_INTERRUPT;
 	tdata->is_pkg_data = pkg_flag;
 	tdata->cpu = cpu;
 	tdata->cpu_core_id = TO_CORE_ID(cpu);
@@ -533,7 +604,7 @@ static int create_core_data(struct platform_data *pdata,
 	else
 		tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
 
-	update_ttarget(c->x86_model, tdata, &pdev->dev);
+	get_ttarget(tdata, &pdev->dev);
 	pdata->core_data[attr_no] = tdata;
 
 	/* Create sysfs interfaces */
-- 
1.6.1


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