drm/amdgpu: add the common code to support mclk OD

This implements mclk OverDrive(OD) through sysfs.
The new entry pp_mclk_od is read/write. The value of input/output
is an integer of the overclocking percentage.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1563,6 +1563,8 @@ struct amdgpu_dpm_funcs {
 	int (*print_clock_levels)(struct amdgpu_device *adev, enum pp_clock_type type, char *buf);
 	int (*get_sclk_od)(struct amdgpu_device *adev);
 	int (*set_sclk_od)(struct amdgpu_device *adev, uint32_t value);
+	int (*get_mclk_od)(struct amdgpu_device *adev);
+	int (*set_mclk_od)(struct amdgpu_device *adev, uint32_t value);
 };
 
 struct amdgpu_dpm {
@@ -2351,6 +2353,12 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
 #define amdgpu_dpm_set_sclk_od(adev, value) \
 	(adev)->powerplay.pp_funcs->set_sclk_od((adev)->powerplay.pp_handle, value)
 
+#define amdgpu_dpm_get_mclk_od(adev) \
+	((adev)->powerplay.pp_funcs->get_mclk_od((adev)->powerplay.pp_handle))
+
+#define amdgpu_dpm_set_mclk_od(adev, value) \
+	((adev)->powerplay.pp_funcs->set_mclk_od((adev)->powerplay.pp_handle, value))
+
 #define amdgpu_dpm_dispatch_task(adev, event_id, input, output)		\
 	(adev)->powerplay.pp_funcs->dispatch_tasks((adev)->powerplay.pp_handle, (event_id), (input), (output))
 

drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

@@ -527,6 +527,52 @@ static ssize_t amdgpu_set_pp_sclk_od(struct device *dev,
 	return count;
 }
 
+static ssize_t amdgpu_get_pp_mclk_od(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+	uint32_t value = 0;
+
+	if (adev->pp_enabled)
+		value = amdgpu_dpm_get_mclk_od(adev);
+	else if (adev->pm.funcs->get_mclk_od)
+		value = adev->pm.funcs->get_mclk_od(adev);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", value);
+}
+
+static ssize_t amdgpu_set_pp_mclk_od(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf,
+		size_t count)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+	int ret;
+	long int value;
+
+	ret = kstrtol(buf, 0, &value);
+
+	if (ret) {
+		count = -EINVAL;
+		goto fail;
+	}
+
+	if (adev->pp_enabled) {
+		amdgpu_dpm_set_mclk_od(adev, (uint32_t)value);
+		amdgpu_dpm_dispatch_task(adev, AMD_PP_EVENT_READJUST_POWER_STATE, NULL, NULL);
+	} else if (adev->pm.funcs->set_mclk_od) {
+		adev->pm.funcs->set_mclk_od(adev, (uint32_t)value);
+		adev->pm.dpm.current_ps = adev->pm.dpm.boot_ps;
+		amdgpu_pm_compute_clocks(adev);
+	}
+
+fail:
+	return count;
+}
+
 static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, amdgpu_get_dpm_state, amdgpu_set_dpm_state);
 static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR,
 		   amdgpu_get_dpm_forced_performance_level,
@@ -551,6 +597,9 @@ static DEVICE_ATTR(pp_dpm_pcie, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(pp_sclk_od, S_IRUGO | S_IWUSR,
 		amdgpu_get_pp_sclk_od,
 		amdgpu_set_pp_sclk_od);
+static DEVICE_ATTR(pp_mclk_od, S_IRUGO | S_IWUSR,
+		amdgpu_get_pp_mclk_od,
+		amdgpu_set_pp_mclk_od);
 
 static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
 				      struct device_attribute *attr,
@@ -1191,6 +1240,11 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
 		DRM_ERROR("failed to create device file pp_sclk_od\n");
 		return ret;
 	}
+	ret = device_create_file(adev->dev, &dev_attr_pp_mclk_od);
+	if (ret) {
+		DRM_ERROR("failed to create device file pp_mclk_od\n");
+		return ret;
+	}
 
 	ret = amdgpu_debugfs_pm_init(adev);
 	if (ret) {
@@ -1219,6 +1273,7 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
 	device_remove_file(adev->dev, &dev_attr_pp_dpm_mclk);
 	device_remove_file(adev->dev, &dev_attr_pp_dpm_pcie);
 	device_remove_file(adev->dev, &dev_attr_pp_sclk_od);
+	device_remove_file(adev->dev, &dev_attr_pp_mclk_od);
 }
 
 void amdgpu_pm_compute_clocks(struct amdgpu_device *adev)

drivers/gpu/drm/amd/powerplay/amd_powerplay.c

@@ -848,6 +848,44 @@ static int pp_dpm_set_sclk_od(void *handle, uint32_t value)
 	return hwmgr->hwmgr_func->set_sclk_od(hwmgr, value);
 }
 
+static int pp_dpm_get_mclk_od(void *handle)
+{
+	struct pp_hwmgr *hwmgr;
+
+	if (!handle)
+		return -EINVAL;
+
+	hwmgr = ((struct pp_instance *)handle)->hwmgr;
+
+	PP_CHECK_HW(hwmgr);
+
+	if (hwmgr->hwmgr_func->get_mclk_od == NULL) {
+		printk(KERN_INFO "%s was not implemented.\n", __func__);
+		return 0;
+	}
+
+	return hwmgr->hwmgr_func->get_mclk_od(hwmgr);
+}
+
+static int pp_dpm_set_mclk_od(void *handle, uint32_t value)
+{
+	struct pp_hwmgr *hwmgr;
+
+	if (!handle)
+		return -EINVAL;
+
+	hwmgr = ((struct pp_instance *)handle)->hwmgr;
+
+	PP_CHECK_HW(hwmgr);
+
+	if (hwmgr->hwmgr_func->set_mclk_od == NULL) {
+		printk(KERN_INFO "%s was not implemented.\n", __func__);
+		return 0;
+	}
+
+	return hwmgr->hwmgr_func->set_mclk_od(hwmgr, value);
+}
+
 const struct amd_powerplay_funcs pp_dpm_funcs = {
 	.get_temperature = pp_dpm_get_temperature,
 	.load_firmware = pp_dpm_load_fw,
@@ -872,6 +910,8 @@ const struct amd_powerplay_funcs pp_dpm_funcs = {
 	.print_clock_levels = pp_dpm_print_clock_levels,
 	.get_sclk_od = pp_dpm_get_sclk_od,
 	.set_sclk_od = pp_dpm_set_sclk_od,
+	.get_mclk_od = pp_dpm_get_mclk_od,
+	.set_mclk_od = pp_dpm_set_mclk_od,
 };
 
 static int amd_pp_instance_init(struct amd_pp_init *pp_init,

drivers/gpu/drm/amd/powerplay/inc/amd_powerplay.h

@@ -345,6 +345,8 @@ struct amd_powerplay_funcs {
 	int (*print_clock_levels)(void *handle, enum pp_clock_type type, char *buf);
 	int (*get_sclk_od)(void *handle);
 	int (*set_sclk_od)(void *handle, uint32_t value);
+	int (*get_mclk_od)(void *handle);
+	int (*set_mclk_od)(void *handle, uint32_t value);
 };
 
 struct amd_powerplay {

drivers/gpu/drm/amd/powerplay/inc/hwmgr.h

@@ -340,6 +340,8 @@ struct pp_hwmgr_func {
 	int (*enable_per_cu_power_gating)(struct pp_hwmgr *hwmgr, bool enable);
 	int (*get_sclk_od)(struct pp_hwmgr *hwmgr);
 	int (*set_sclk_od)(struct pp_hwmgr *hwmgr, uint32_t value);
+	int (*get_mclk_od)(struct pp_hwmgr *hwmgr);
+	int (*set_mclk_od)(struct pp_hwmgr *hwmgr, uint32_t value);
 };
 
 struct pp_table_func {