Exposes the WMI functions for enable/disable of performance and
efficiency cores on some laptop models (largely Intel only).
Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
---
.../ABI/testing/sysfs-platform-asus-wmi | 19 ++++++++
drivers/platform/x86/asus-wmi.c | 45 +++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 5 +++
3 files changed, 69 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index 3b4eeea75b7b..ac881e72e374 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -226,3 +226,22 @@ Description:
Set panel to UHD or FHD mode
* 0 - UHD,
* 1 - FHD
+
+What: /sys/devices/platform/<platform>/cores_enabled
+Date: Jun 2024
+KernelVersion: 6.11
+Contact: "Luke Jones" <luke@xxxxxxxxxx>
+Description:
+ Enable/disable efficiency and performance cores. The format is
+ 0x[E][P] where [E] is the efficiency core count, and [P] is
+ the perfromance core count. If the core count is a single digit
+ it is preceded by a 0 such as 0x0406; E=4, P=6, 0x1006; E=10, P=6
+
+What: /sys/devices/platform/<platform>/cores_max
+Date: Jun 2024
+KernelVersion: 6.11
+Contact: "Luke Jones" <luke@xxxxxxxxxx>
+Description:
+ Show the maximum performance and efficiency core countin format
+ 0x[E][P] where [E] is the efficiency core count, and [P] is
+ the perfromance core count.
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 4b045f1828f1..f62a36dfcd4b 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -815,6 +815,46 @@ static ssize_t panel_fhd_store(struct device *dev,
WMI_SIMPLE_SHOW(panel_fhd, "%d\n", ASUS_WMI_DEVID_PANEL_FHD);
static DEVICE_ATTR_RW(panel_fhd);
+/* Efficiency and Performance core control **********************************/
+static ssize_t cores_enabled_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int result, err;
+ u32 cores, max;
+
+ result = kstrtou32(buf, 16, &cores);
+ if (result)
+ return result;
+
+ err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_CORES_MAX, &max);
+ if (err < 0)
+ return err;
+
+ if (cores > max) {
+ pr_warn("Core count 0x%x exceeds max: 0x%x\n", cores, max);
+ return -EIO;
+ }
+
+ err = asus_wmi_set_devstate(ASUS_WMI_DEVID_CORES_SET, cores, &result);
+ if (err) {
+ pr_warn("Failed to set cores_enabled: %d\n", err);
+ return err;
+ }
+
+ pr_info("Enabled core count changed, reboot required\n");
+ sysfs_notify(&asus->platform_device->dev.kobj, NULL, "cores_enabled");
+
+ return count;
+}
+
+WMI_SIMPLE_SHOW(cores_enabled, "0x%x\n", ASUS_WMI_DEVID_CORES_SET);
+static DEVICE_ATTR_RW(cores_enabled);
+
+WMI_SIMPLE_SHOW(cores_max, "0x%x\n", ASUS_WMI_DEVID_CORES_MAX);
+static DEVICE_ATTR_RO(cores_max);
+
/* Tablet mode ****************************************************************/
static void asus_wmi_tablet_mode_get_state(struct asus_wmi *asus)
@@ -4058,6 +4098,8 @@ static struct attribute *platform_attributes[] = {
&dev_attr_boot_sound.attr,
&dev_attr_panel_od.attr,
&dev_attr_panel_fhd.attr,
+ &dev_attr_cores_enabled.attr,
+ &dev_attr_cores_max.attr,
&dev_attr_mini_led_mode.attr,
&dev_attr_available_mini_led_mode.attr,
NULL
@@ -4131,6 +4173,9 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
devid = ASUS_WMI_DEVID_PANEL_OD;
else if (attr == &dev_attr_panel_fhd.attr)
devid = ASUS_WMI_DEVID_PANEL_FHD;
+ else if (attr == &dev_attr_cores_enabled.attr
+ || attr == &dev_attr_cores_max.attr)
+ ok = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CORES_SET);
else if (attr == &dev_attr_mini_led_mode.attr)
ok = asus->mini_led_dev_id != 0;
else if (attr == &dev_attr_available_mini_led_mode.attr)
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 6c51d41ffc20..5a56e7e97785 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -116,6 +116,11 @@
/* Charging mode - 1=Barrel, 2=USB */
#define ASUS_WMI_DEVID_CHARGE_MODE 0x0012006C
+/* Intel E-core and P-core configuration in a format 0x0[E]0[P] */
+#define ASUS_WMI_DEVID_CORES_SET 0x001200D2
+ /* Maximum Intel E-core and P-core availability */
+#define ASUS_WMI_DEVID_CORES_MAX 0x001200D3
+
/* MCU powersave mode */
#define ASUS_WMI_DEVID_MCU_POWERSAVE 0x001200E2
--
2.45.1
