drm/amdgpu: add powerplay sclk OD support through sysfs (v2)

Add a new sysfs entry pp_sclk_od to support sclk overdrive(OD) overclocking,
the entry is read/write, the value of input/output is an integer which is the
over percentage of the highest sclk.

v2: drop extra semicolon

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>

2 files changed, 55 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index ac8e02f9105a..611d33d855ff 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -2342,6 +2342,12 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
 #define amdgpu_dpm_force_clock_level(adev, type, level) \
                 (adev)->powerplay.pp_funcs->force_clock_level((adev)->powerplay.pp_handle, type, level)
 
+#define amdgpu_dpm_get_sclk_od(adev) \
+        (adev)->powerplay.pp_funcs->get_sclk_od((adev)->powerplay.pp_handle)
+
+#define amdgpu_dpm_set_sclk_od(adev, value) \
+        (adev)->powerplay.pp_funcs->set_sclk_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))
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 0e13d80d2a95..191c28ff0d93 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -469,6 +469,46 @@ fail:
         return count;
 }
 
+static ssize_t amdgpu_get_pp_sclk_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_sclk_od(adev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", value);
+}
+
+static ssize_t amdgpu_set_pp_sclk_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_sclk_od(adev, (uint32_t)value);
+
+        amdgpu_dpm_dispatch_task(adev, AMD_PP_EVENT_READJUST_POWER_STATE, NULL, NULL);
+
+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,
@@ -490,6 +530,9 @@ static DEVICE_ATTR(pp_dpm_mclk, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(pp_dpm_pcie, S_IRUGO | S_IWUSR,
                 amdgpu_get_pp_dpm_pcie,
                 amdgpu_set_pp_dpm_pcie);
+static DEVICE_ATTR(pp_sclk_od, S_IRUGO | S_IWUSR,
+                amdgpu_get_pp_sclk_od,
+                amdgpu_set_pp_sclk_od);
 
 static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
                                       struct device_attribute *attr,
@@ -1123,6 +1166,11 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
                         DRM_ERROR("failed to create device file pp_dpm_pcie\n");
                         return ret;
                 }
+                ret = device_create_file(adev->dev, &dev_attr_pp_sclk_od);
+                if (ret) {
+                        DRM_ERROR("failed to create device file pp_sclk_od\n");
+                        return ret;
+                }
         }
         ret = amdgpu_debugfs_pm_init(adev);
         if (ret) {
@@ -1149,6 +1197,7 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
                 device_remove_file(adev->dev, &dev_attr_pp_dpm_sclk);
                 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);
         }
 }