[PATCH] SWDEV-231280 CentOS-AWS Guest driver reload 3 failed with call trace in guest

[Deng, Emily]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Emily Deng <Emily.Deng at amd.com>

>-----Original Message-----
>From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Gu,
>JiaWei (Will)
>Sent: Tuesday, April 21, 2020 11:56 AM
>To: Gu, JiaWei (Will) <JiaWei.Gu at amd.com>; amd-gfx at lists.freedesktop.org
>Subject: RE: [PATCH] SWDEV-231280 CentOS-AWS Guest driver reload 3 failed
>with call trace in guest
>
>[AMD Official Use Only - Internal Distribution Only]
>
>Ping......
>
>-----Original Message-----
>From: Jiawei <Jiawei.Gu at amd.com>
>Sent: Monday, April 20, 2020 7:34 PM
>To: amd-gfx at lists.freedesktop.org
>Cc: Gu, JiaWei (Will) <JiaWei.Gu at amd.com>
>Subject: [PATCH] SWDEV-231280 CentOS-AWS Guest driver reload 3 failed
>with call trace in guest
>
>root cause:
>X enables vblank, but driver skips shutting down vblank during unloading
>under sriov, which causes kernel call trace
>
>solution:
>move vblank shutdown logic  into dce_virtual_crtc_disable() to avoid sriov skip
>
>Signed-off-by: Jiawei <Jiawei.Gu at amd.com>
>---
> drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
>b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
>index 3f739efead61..c02797f2ee7f 100644
>--- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
>+++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
>@@ -191,8 +191,9 @@ static void dce_virtual_crtc_disable(struct drm_crtc
>*crtc)  {
> 	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
>
>-	dce_virtual_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
>+	drm_crtc_vblank_off(crtc);
>
>+	amdgpu_crtc->enabled = false;
> 	amdgpu_crtc->pll_id = ATOM_PPLL_INVALID;
> 	amdgpu_crtc->encoder = NULL;
> 	amdgpu_crtc->connector = NULL;
>--
>2.20.1
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