drm/amdgpu: XGMI pstate switch initial support

Driver vote low to high pstate switch whenever there is an outstanding
XGMI mapping request. Driver vote high to low pstate when all the
outstanding XGMI mapping is terminated.

Signed-off-by: shaoyunl <shaoyun.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index fcc4b05c745c..807440d3edff 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -200,6 +200,7 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev, int lo
 
         if (lock)
                 mutex_lock(&tmp->hive_lock);
+        tmp->pstate = -1;
 
         mutex_unlock(&xgmi_mutex);
 
@@ -321,3 +322,17 @@ void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
                 mutex_unlock(&hive->hive_lock);
         }
 }
+
+int amdgpu_xgmi_set_pstate(struct amdgpu_device *adev, int pstate)
+{
+        int ret = 0;
+        struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev, 0);
+
+        if (!hive)
+                return 0;
+
+        if (hive->pstate == pstate)
+                return 0;
+        /* Todo : sent the message to SMU for pstate change */
+        return ret;
+}
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