From 4108c2be12ebe78accb40d43f4713a7cc481b18a Mon Sep 17 00:00:00 2001 From: Samuel Zhang Date: Thu, 8 May 2025 14:36:35 +0800 Subject: drm/amdgpu: fix fence fallback timer expired error IH is not working after switching a new gpu index for the first time. During VM resume, QEMU programming of VF MSIX table (register GFXMSIX_VECT0_ADDR_LO) may not work.The access could be blocked by nBIF protection as VF isn't in exclusive access mode. Exclusive access is enabled now, disable/enable MSIX so that QEMU reprograms MSIX table. call amdgpu_restore_msix on resume to restore msix table. Signed-off-by: Samuel Zhang Acked-by: Lijo Lazar Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_device.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 13708dc7706a..b16f7c4beb22 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -5109,6 +5109,13 @@ static inline int amdgpu_virt_resume(struct amdgpu_device *adev) int r; unsigned int prev_physical_node_id = adev->gmc.xgmi.physical_node_id; + /* During VM resume, QEMU programming of VF MSIX table (register GFXMSIX_VECT0_ADDR_LO) + * may not work. The access could be blocked by nBIF protection as VF isn't in + * exclusive access mode. Exclusive access is enabled now, disable/enable MSIX + * so that QEMU reprograms MSIX table. + */ + amdgpu_restore_msix(adev); + r = adev->gfxhub.funcs->get_xgmi_info(adev); if (r) return r; -- cgit v1.2.3