Revert duplicate "drm/amdgpu: disable peer-to-peer access for DCC-enabled GC12 VRAM surfaces"

This reverts commit 22a36e6 once,
which was merged twice due to an incorrect backmerge resolution.

Fixes: ce0478b ("Merge tag 'v6.18-rc6' into drm-next")
Signed-off-by: Peter Colberg <pcolberg@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 38a0f4c)

Author: pcolberg

drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c

@@ -83,18 +83,6 @@ static int amdgpu_dma_buf_attach(struct dma_buf *dmabuf,
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	int r;
 
-	/*
-	 * Disable peer-to-peer access for DCC-enabled VRAM surfaces on GFX12+.
-	 * Such buffers cannot be safely accessed over P2P due to device-local
-	 * compression metadata. Fallback to system-memory path instead.
-	 * Device supports GFX12 (GC 12.x or newer)
-	 * BO was created with the AMDGPU_GEM_CREATE_GFX12_DCC flag
-	 *
-	 */
-	if (amdgpu_ip_version(adev, GC_HWIP, 0) >= IP_VERSION(12, 0, 0) &&
-	    bo->flags & AMDGPU_GEM_CREATE_GFX12_DCC)
-		attach->peer2peer = false;
-
 	/*
 	 * Disable peer-to-peer access for DCC-enabled VRAM surfaces on GFX12+.
 	 * Such buffers cannot be safely accessed over P2P due to device-local