drm/amdgpu: Optimize a function called by every IB sheduling

  Move several if statements and a loop statment from
  run time to initialization time.

Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 40 insertions, 27 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 6a85db0c0bc3..7d95435fad16 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -153,6 +153,36 @@ void amdgpu_ring_undo(struct amdgpu_ring *ring)
 }
 
 /**
+ * amdgpu_ring_check_compute_vm_bug - check whether this ring has compute vm bug
+ *
+ * @adev: amdgpu_device pointer
+ * @ring: amdgpu_ring structure holding ring information
+ */
+static void amdgpu_ring_check_compute_vm_bug(struct amdgpu_device *adev,
+                                        struct amdgpu_ring *ring)
+{
+        const struct amdgpu_ip_block *ip_block;
+
+        ring->has_compute_vm_bug = false;
+
+        if (ring->funcs->type != AMDGPU_RING_TYPE_COMPUTE)
+                /* only compute rings */
+                return;
+
+        ip_block = amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_GFX);
+        if (!ip_block)
+                return;
+
+        /* Compute ring has a VM bug for GFX version < 7.
+           And compute ring has a VM bug for GFX 8 MEC firmware version < 673.*/
+        if (ip_block->version->major <= 7) {
+                ring->has_compute_vm_bug = true;
+        } else if (ip_block->version->major == 8)
+                if (adev->gfx.mec_fw_version < 673)
+                        ring->has_compute_vm_bug = true;
+}
+
+/**
  * amdgpu_ring_init - init driver ring struct.
  *
  * @adev: amdgpu_device pointer
@@ -257,6 +287,9 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
         if (amdgpu_debugfs_ring_init(adev, ring)) {
                 DRM_ERROR("Failed to register debugfs file for rings !\n");
         }
+
+        amdgpu_ring_check_compute_vm_bug(adev, ring);
+
         return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index a9223a8de8c2..334307efac8b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -185,6 +185,7 @@ struct amdgpu_ring {
         u64                     cond_exe_gpu_addr;
         volatile u32            *cond_exe_cpu_addr;
         unsigned                vm_inv_eng;
+        bool                    has_compute_vm_bug;
 #if defined(CONFIG_DEBUG_FS)
         struct dentry *ent;
 #endif
@@ -207,4 +208,9 @@ static inline void amdgpu_ring_clear_ring(struct amdgpu_ring *ring)
 
 }
 
+static inline bool amdgpu_ring_has_compute_vm_bug(struct amdgpu_ring *ring)
+{
+        return ring->has_compute_vm_bug;
+}
+
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b2384b8536b9..7a323f91a10b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -656,32 +656,6 @@ unlock:
         return r;
 }
 
-static bool amdgpu_vm_ring_has_compute_vm_bug(struct amdgpu_ring *ring)
-{
-        struct amdgpu_device *adev = ring->adev;
-        const struct amdgpu_ip_block *ip_block;
-
-        if (ring->funcs->type != AMDGPU_RING_TYPE_COMPUTE)
-                /* only compute rings */
-                return false;
-
-        ip_block = amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_GFX);
-        if (!ip_block)
-                return false;
-
-        if (ip_block->version->major <= 7) {
-                /* gfx7 has no workaround */
-                return true;
-        } else if (ip_block->version->major == 8) {
-                if (adev->gfx.mec_fw_version >= 673)
-                        /* gfx8 is fixed in MEC firmware 673 */
-                        return false;
-                else
-                        return true;
-        }
-        return false;
-}
-
 bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring,
                                   struct amdgpu_job *job)
 {
@@ -691,7 +665,7 @@ bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring,
         struct amdgpu_vm_id *id;
         bool gds_switch_needed;
         bool vm_flush_needed = job->vm_needs_flush ||
-                amdgpu_vm_ring_has_compute_vm_bug(ring);
+                amdgpu_ring_has_compute_vm_bug(ring);
 
         if (job->vm_id == 0)
                 return false;