drm/amdgpu: implement read_sensor() for pre-powerplay chips

Add the GPU temperature, the shader clock and eventually the
memory clock (as well as the GPU load on CI). The main goal is
to expose this info to the userspace like Radeon.

v2: - add AMDGPU_PP_SENSOR_GPU_LOAD on CI
    - update the commit description

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
index 578878d1d4c0..b00e81db522d 100644
--- a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
@@ -6936,6 +6936,48 @@ static int ci_dpm_switch_power_profile(struct amdgpu_device *adev,
 	return 0;
 }
 
+static int ci_dpm_read_sensor(struct amdgpu_device *adev, int idx,
+			      void *value, int *size)
+{
+	u32 activity_percent = 50;
+	int ret;
+
+	/* size must be at least 4 bytes for all sensors */
+	if (*size < 4)
+		return -EINVAL;
+
+	switch (idx) {
+	case AMDGPU_PP_SENSOR_GFX_SCLK:
+		*((uint32_t *)value) = ci_get_average_sclk_freq(adev);
+		*size = 4;
+		return 0;
+	case AMDGPU_PP_SENSOR_GFX_MCLK:
+		*((uint32_t *)value) = ci_get_average_mclk_freq(adev);
+		*size = 4;
+		return 0;
+	case AMDGPU_PP_SENSOR_GPU_TEMP:
+		*((uint32_t *)value) = ci_dpm_get_temp(adev);
+		*size = 4;
+		return 0;
+	case AMDGPU_PP_SENSOR_GPU_LOAD:
+		ret = ci_read_smc_soft_register(adev,
+						offsetof(SMU7_SoftRegisters,
+							 AverageGraphicsA),
+						&activity_percent);
+		if (ret == 0) {
+			activity_percent += 0x80;
+			activity_percent >>= 8;
+			activity_percent =
+				activity_percent > 100 ? 100 : activity_percent;
+		}
+		*((uint32_t *)value) = activity_percent;
+		*size = 4;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 const struct amd_ip_funcs ci_dpm_ip_funcs = {
 	.name = "ci_dpm",
 	.early_init = ci_dpm_early_init,
@@ -6982,6 +7024,7 @@ static const struct amdgpu_dpm_funcs ci_dpm_funcs = {
 	.set_power_profile_state = ci_dpm_set_power_profile_state,
 	.reset_power_profile_state = ci_dpm_reset_power_profile_state,
 	.switch_power_profile = ci_dpm_switch_power_profile,
+	.read_sensor = ci_dpm_read_sensor,
 };
 
 static void ci_dpm_set_dpm_funcs(struct amdgpu_device *adev)