[PATCH 04/36] drm/amdgpu: enable legacy enforce isolation by default

[Alex Deucher]

Enable legacy enforce isolation (just serialize kernel
GC submissions) for gfx9+.  This way we can reset a ring and
only affect the the process currently using that ring.
This mirrors what windows does.

Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 13070211dc69c..508546ef55787 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2148,9 +2148,7 @@ static int amdgpu_device_check_arguments(struct amdgpu_device *adev)
 
 	for (i = 0; i < MAX_XCP; i++) {
 		switch (amdgpu_enforce_isolation) {
-		case -1:
 		case 0:
-		default:
 			/* disable */
 			adev->enforce_isolation[i] = AMDGPU_ENFORCE_ISOLATION_DISABLE;
 			break;
@@ -2164,6 +2162,17 @@ static int amdgpu_device_check_arguments(struct amdgpu_device *adev)
 			adev->enforce_isolation[i] =
 				AMDGPU_ENFORCE_ISOLATION_ENABLE_LEGACY;
 			break;
+		case -1:
+		default:
+			/* disable by default on GFX8 and older */
+			if (adev->asic_type <= CHIP_VEGAM)
+				/* disable */
+				adev->enforce_isolation[i] = AMDGPU_ENFORCE_ISOLATION_DISABLE;
+			else
+				/* enable legacy mode */
+				adev->enforce_isolation[i] =
+					AMDGPU_ENFORCE_ISOLATION_ENABLE_LEGACY;
+			break;
 		case 3:
 			/* enable only process isolation without submitting cleaner shader */
 			adev->enforce_isolation[i] =
-- 
2.49.0