@@ -38,6 +38,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/debugfs.h>
#include <linux/pci.h>
#include "processor_thermal_device.h"
@@ -53,6 +54,7 @@ struct mmio_reg {
struct ptc_data {
u32 offset;
+ struct pci_dev *pdev;
struct attribute_group ptc_attr_group;
struct attribute *ptc_attrs[PTC_MAX_ATTRS];
struct device_attribute temperature_target_attr;
@@ -222,6 +224,63 @@ static int ptc_create_groups(struct pci_dev *pdev, int instance, struct ptc_data
}
static struct ptc_data ptc_instance[PTC_MAX_INSTANCES];
+static struct dentry *ptc_debugfs;
+
+#define PTC_TEMP_OVERRIDE_ENABLE_INDEX 4
+#define PTC_TEMP_OVERRIDE_INDEX 5
+
+static ssize_t ptc_temperature_write(struct file *file, const char __user *data,
+ size_t count, loff_t *ppos)
+{
+ struct ptc_data *ptc_instance = file->private_data;
+ struct pci_dev *pdev = ptc_instance->pdev;
+ char buf[32];
+ ssize_t len;
+ u32 value;
+
+ len = min(count, sizeof(buf) - 1);
+ if (copy_from_user(buf, data, len))
+ return -EFAULT;
+
+ buf[len] = '\0';
+ if (kstrtouint(buf, 0, &value))
+ return -EINVAL;
+
+ if (ptc_mmio_regs[PTC_TEMP_OVERRIDE_INDEX].units)
+ value /= ptc_mmio_regs[PTC_TEMP_OVERRIDE_INDEX].units;
+
+ if (value > ptc_mmio_regs[PTC_TEMP_OVERRIDE_INDEX].mask)
+ return -EINVAL;
+
+ if (!value) {
+ ptc_mmio_write(pdev, ptc_instance->offset, PTC_TEMP_OVERRIDE_ENABLE_INDEX, 0);
+ } else {
+ ptc_mmio_write(pdev, ptc_instance->offset, PTC_TEMP_OVERRIDE_INDEX, value);
+ ptc_mmio_write(pdev, ptc_instance->offset, PTC_TEMP_OVERRIDE_ENABLE_INDEX, 1);
+ }
+
+ return count;
+}
+
+static const struct file_operations ptc_fops = {
+ .open = simple_open,
+ .write = ptc_temperature_write,
+ .llseek = generic_file_llseek,
+};
+
+static void ptc_create_debugfs(void)
+{
+ ptc_debugfs = debugfs_create_dir("plaftform_temperature_control", NULL);
+
+ debugfs_create_file("temperature_0", 0200, ptc_debugfs, &ptc_instance[0], &ptc_fops);
+ debugfs_create_file("temperature_1", 0200, ptc_debugfs, &ptc_instance[1], &ptc_fops);
+ debugfs_create_file("temperature_2", 0200, ptc_debugfs, &ptc_instance[2], &ptc_fops);
+}
+
+static void ptc_delete_debugfs(void)
+{
+ debugfs_remove_recursive(ptc_debugfs);
+}
int proc_thermal_ptc_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv)
{
@@ -230,10 +289,13 @@ int proc_thermal_ptc_add(struct pci_dev *pdev, struct proc_thermal_device *proc_
for (i = 0; i < PTC_MAX_INSTANCES; i++) {
ptc_instance[i].offset = ptc_offsets[i];
+ ptc_instance[i].pdev = pdev;
ptc_create_groups(pdev, i, &ptc_instance[i]);
}
}
+ ptc_create_debugfs();
+
return 0;
}
EXPORT_SYMBOL_GPL(proc_thermal_ptc_add);
@@ -248,6 +310,8 @@ void proc_thermal_ptc_remove(struct pci_dev *pdev)
for (i = 0; i < PTC_MAX_INSTANCES; i++)
sysfs_remove_group(&pdev->dev.kobj, &ptc_instance[i].ptc_attr_group);
}
+
+ ptc_delete_debugfs();
}
EXPORT_SYMBOL_GPL(proc_thermal_ptc_remove);
Add debugfs interface to override hardware provide temperature. This interface can be used primarily for debug. Alternatively this can be also used to use hardware control loops to manage temperature for virtual sensors. Virtual sensors are soft sensors created by kernel/ user space aggregating other sensors. There are three attributes to override the maximum three instances of platform temperature control. /sys/kernel/debug/plaftform_temperature_control/ ├── temperature_0 ├── temperature_1 └── temperature_2 These are write only attributes requires admin privilege. Any value greater than 0, will override the temperature. A value of 0 will stop overriding the temperature. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> --- .../platform_temperature_control.c | 64 +++++++++++++++++++ 1 file changed, 64 insertions(+)