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Commit a34f8363 authored by Min He's avatar Min He Committed by Zhenyu Wang
Browse files

drm/i915/gvt: set the correct default value of CTX STATUS PTR 



Fix wrong initial csb read pointer value. This fixes the random
engine timeout issue in guest when guest boots up.

Fixes: 8453d674 ("drm/i915/gvt: vGPU execlist virtualization")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: default avatarMin He <min.he@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent aa4ce449

drivers/gpu/drm/i915/gvt/execlist.c

+2 −1
Original line number Diff line number Diff line
@@ -775,7 +775,8 @@ static void init_vgpu_execlist(struct intel_vgpu *vgpu, int ring_id) 
			_EL_OFFSET_STATUS_PTR);



	ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);

	ctx_status_ptr.read_ptr = ctx_status_ptr.write_ptr = 0x7;

	ctx_status_ptr.read_ptr = 0;

	ctx_status_ptr.write_ptr = 0x7;

	vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;

}