Hi Fenghua,
This patch adds the core and package thermal threshold support to coretemp.c.
These thresholds can be read/written using the hwmon sysfs interfaces
temp1_core_thresh[0/1] and temp1_pkg_thresh[0/1].
These thresholds are managed dynamically to generate interrupts,
to do power management.
This patch is generated against the stable Linux-2.6 tree.
Kindly review and merge.
-------------------------------------------------------------------------
From: Durgadoss R <durgadoss.r@xxxxxxxxx>
Date: Tue, 7 Dec 2010 03:27:00 +0530
Subject: [PATCH 1/2] Adding_Threshold_support_to_coretemp
This patch adds the core and package threshold support to coretemp.c.
These thresholds can be read/written using the sysfs interfaces
temp1_core_thresh[0/1] and temp1_pkg_thresh[0/1].
These can be used to generate interrupts, to do dynamic power management.
Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
---
arch/x86/include/asm/msr-index.h | 12 ++
drivers/hwmon/coretemp.c | 225 +++++++++++++++++++++++++++++++++++++-
2 files changed, 233 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 3ea3dc4..f0fea26 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -253,6 +253,18 @@
#define PACKAGE_THERM_INT_LOW_ENABLE (1 << 1)
#define PACKAGE_THERM_INT_PLN_ENABLE (1 << 24)
+/* Threshold Support */
+#define THERM_INT_THRESHOLD0_ENABLE (1 << 15)
+#define THERM_OFFSET_THRESHOLD0 8
+#define THERM_MASK_THRESHOLD0 (0x7f << THERM_OFFSET_THRESHOLD0)
+#define THERM_INT_THRESHOLD1_ENABLE (1 << 23)
+#define THERM_OFFSET_THRESHOLD1 16
+#define THERM_MASK_THRESHOLD1 (0x7f << THERM_OFFSET_THRESHOLD1)
+#define THERM_STATUS_THRESHOLD0 (1 << 6)
+#define THERM_LOG_THRESHOLD0 (1 << 7)
+#define THERM_STATUS_THRESHOLD1 (1 << 8)
+#define THERM_LOG_THRESHOLD1 (1 << 9)
+
/* MISC_ENABLE bits: architectural */
#define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << 0)
#define MSR_IA32_MISC_ENABLE_TCC (1ULL << 1)
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 42de98d..7aea83e 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -41,6 +41,10 @@
typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
SHOW_NAME } SHOW;
+/* C indicates core thermal thresholds
+ * P indicates Package thermal thresholds
+ */
+enum thresholds { C_TTHRESH0, C_TTHRESH1, P_TTHRESH0, P_TTHRESH1 } THRESH;
/*
* Functions declaration
@@ -59,9 +63,18 @@ struct coretemp_data {
int temp;
int tjmax;
int ttarget;
+ int c_tthresh0;
+ int c_tthresh1;
+ int p_tthresh0;
+ int p_tthresh1;
+ int pkg_support; /* zero if pkg thresh support is not there */
u8 alarm;
};
+static int set_core_threshold(struct coretemp_data *data, int val,
+ enum thresholds thresh);
+static int set_pkg_threshold(struct coretemp_data *data, int val,
+ enum thresholds thresh);
/*
* Sysfs stuff
*/
@@ -104,6 +117,48 @@ static ssize_t show_temp(struct device *dev,
return err;
}
+static ssize_t show_threshold(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct coretemp_data *data = coretemp_update_device(dev);
+
+ if (!data->valid)
+ return -EINVAL;
+
+ switch (attr->index) {
+ case C_TTHRESH0:
+ return sprintf(buf, "%d\n", data->c_tthresh0);
+ case C_TTHRESH1:
+ return sprintf(buf, "%d\n", data->c_tthresh1);
+ case P_TTHRESH0:
+ return sprintf(buf, "%d\n", data->p_tthresh0);
+ case P_TTHRESH1:
+ return sprintf(buf, "%d\n", data->p_tthresh1);
+ default:
+ return -EINVAL;
+ }
+}
+
+static ssize_t set_threshold(struct device *dev,
+ struct device_attribute *devattr, const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct coretemp_data *data = coretemp_update_device(dev);
+ unsigned long val;
+ int err;
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+
+ if (attr->index == C_TTHRESH0 || attr->index == C_TTHRESH1)
+ err = set_core_threshold(data, val, attr->index);
+ else
+ err = set_pkg_threshold(data, val, attr->index);
+
+ return (err) ? -EINVAL : count;
+}
+
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
SHOW_TEMP);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
@@ -114,12 +169,23 @@ static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
+static SENSOR_DEVICE_ATTR(temp1_core_thresh0, S_IWUSR | S_IRUGO,
+ show_threshold, set_threshold, C_TTHRESH0);
+static SENSOR_DEVICE_ATTR(temp1_core_thresh1, S_IWUSR | S_IRUGO,
+ show_threshold, set_threshold, C_TTHRESH1);
+static SENSOR_DEVICE_ATTR(temp1_pkg_thresh0, S_IWUSR | S_IRUGO,
+ show_threshold, set_threshold, P_TTHRESH0);
+static SENSOR_DEVICE_ATTR(temp1_pkg_thresh1, S_IWUSR | S_IRUGO,
+ show_threshold, set_threshold, P_TTHRESH1);
+
static struct attribute *coretemp_attributes[] = {
&sensor_dev_attr_name.dev_attr.attr,
&sensor_dev_attr_temp1_label.dev_attr.attr,
&dev_attr_temp1_crit_alarm.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_core_thresh0.dev_attr.attr,
+ &sensor_dev_attr_temp1_core_thresh1.dev_attr.attr,
NULL
};
@@ -298,6 +364,114 @@ static void __devinit get_ucode_rev_on_cpu(void *edx)
rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx);
}
+static int set_core_threshold(struct coretemp_data *data, int temp,
+ enum thresholds thresh)
+{
+ u32 eax, edx, l;
+ int diff;
+
+ if (temp > data->tjmax)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ diff = (data->tjmax - temp)/1000;
+
+ /* Mask the thermal vector in the lapic */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l | APIC_LVT_MASKED);
+
+ rdmsr_on_cpu(data->id, MSR_IA32_THERM_INTERRUPT, &eax, &edx);
+
+ if (thresh == C_TTHRESH0) {
+ eax = (eax & ~THERM_MASK_THRESHOLD0) |
+ (diff << THERM_OFFSET_THRESHOLD0);
+ data->c_tthresh0 = temp;
+ } else {
+ eax = (eax & ~THERM_MASK_THRESHOLD1) |
+ (diff << THERM_OFFSET_THRESHOLD1);
+ data->c_tthresh1 = temp;
+ }
+
+ wrmsr_on_cpu(data->id, MSR_IA32_THERM_INTERRUPT, eax, edx);
+
+ /* Unmask the thermal vector */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
+
+ mutex_unlock(&data->update_lock);
+ return 0;
+}
+
+static int set_pkg_threshold(struct coretemp_data *data, int temp,
+ enum thresholds thresh)
+{
+ u32 eax, edx, l;
+ int diff;
+
+ if (temp > data->tjmax)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ diff = (data->tjmax - temp)/1000;
+
+ /* Mask the thermal vector in the lapic */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l | APIC_LVT_MASKED);
+
+ rdmsr_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx);
+
+ if (thresh == P_TTHRESH0) {
+ eax = (eax & ~THERM_MASK_THRESHOLD0) |
+ (diff << THERM_OFFSET_THRESHOLD0);
+ data->p_tthresh0 = temp;
+ } else {
+ eax = (eax & ~THERM_MASK_THRESHOLD1) |
+ (diff << THERM_OFFSET_THRESHOLD1);
+ data->p_tthresh1 = temp;
+ }
+
+ wrmsr_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_INTERRUPT, eax, edx);
+
+ /* Unmask the thermal vector */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
+
+ mutex_unlock(&data->update_lock);
+ return 0;
+}
+
+static int __devinit enable_thresh_support(struct coretemp_data *data)
+{
+ u32 eax, edx, l;
+
+ /* Mask the thermal vector in the lapic */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l | APIC_LVT_MASKED);
+
+ rdmsr_on_cpu(data->id, MSR_IA32_THERM_INTERRUPT, &eax, &edx);
+
+ eax |= (THERM_INT_THRESHOLD0_ENABLE | THERM_INT_THRESHOLD1_ENABLE);
+
+ wrmsr_on_cpu(data->id, MSR_IA32_THERM_INTERRUPT, eax, edx);
+
+ if (!data->pkg_support)
+ goto exit;
+
+ rdmsr_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx);
+
+ eax |= (THERM_INT_THRESHOLD0_ENABLE | THERM_INT_THRESHOLD1_ENABLE);
+
+ wrmsr_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_INTERRUPT, eax, edx);
+
+exit:
+ /* Unmask the thermal vector */
+ l = apic_read(APIC_LVTTHMR);
+ apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
+ return 0;
+}
+
static int __devinit coretemp_probe(struct platform_device *pdev)
{
struct coretemp_data *data;
@@ -316,8 +490,11 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
data->core_id = c->cpu_core_id;
#endif
data->name = "coretemp";
- mutex_init(&data->update_lock);
+ if (cpu_has(c, X86_FEATURE_PTS))
+ data->pkg_support = 1;
+
+ mutex_init(&data->update_lock);
/* test if we can access the THERM_STATUS MSR */
err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
if (err) {
@@ -353,6 +530,30 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
data->tjmax = get_tjmax(c, data->id, &pdev->dev);
platform_set_drvdata(pdev, data);
+ /* Enable threshold support */
+ enable_thresh_support(data);
+
+ /* Set Initial Core thresholds */
+ set_core_threshold(data, 0, C_TTHRESH0);
+ set_core_threshold(data, 90000, C_TTHRESH1);
+
+ /* Set Initial Package thresholds, if HW support is available */
+ if (data->pkg_support) {
+ set_pkg_threshold(data, 0, P_TTHRESH0);
+ set_pkg_threshold(data, 80000, P_TTHRESH1);
+ }
+
+ if (data->pkg_support) {
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh0.dev_attr);
+ if (err)
+ goto exit_free;
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh1.dev_attr);
+ if (err)
+ goto exit_pkg_thresh0;
+ }
+
/*
* read the still undocumented IA32_TEMPERATURE_TARGET. It exists
* on older CPUs but not in this register,
@@ -371,12 +572,12 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
err = device_create_file(&pdev->dev,
&sensor_dev_attr_temp1_max.dev_attr);
if (err)
- goto exit_free;
+ goto exit_pkg_thresh1;
}
}
if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
- goto exit_dev;
+ goto exit_dev_max;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -390,8 +591,14 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
exit_class:
sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
-exit_dev:
+exit_dev_max:
device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
+exit_pkg_thresh1:
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh1.dev_attr);
+exit_pkg_thresh0:
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh0.dev_attr);
exit_free:
kfree(data);
exit:
@@ -405,6 +612,16 @@ static int __devexit coretemp_remove(struct platform_device *pdev)
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_core_thresh0.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_core_thresh1.dev_attr);
+ if (data->pkg_support) {
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh0.dev_attr);
+ device_remove_file(&pdev->dev,
+ &sensor_dev_attr_temp1_pkg_thresh1.dev_attr);
+ }
platform_set_drvdata(pdev, NULL);
kfree(data);
return 0;
--
1.6.5.2
Attachment:
0001-Adding_Threshold_support_to_coretemp.patch
Description: 0001-Adding_Threshold_support_to_coretemp.patch
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