From: Huang Rui Date: Fri, 21 Sep 2018 10:15:01 +0000 (+0800) Subject: drm/amdgpu: fix the page fault of raven2 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=75986276217b8fcb4d5aa8fb76540fbb26c061de;p=openwrt%2Fstaging%2Fblogic.git drm/amdgpu: fix the page fault of raven2 While the apg_end address is 0xffffffff, if add 1 with it, the value will be overflow and roll back to 0. So when 0 is written to mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, the system aperture is actually disabled. And so any access to vram will trigger a page fault. Raven2's HW issue only need increase the vram end address, and needn't do it on the agp. Signed-off-by: Huang Rui Acked-by: Alex Deucher Reviewed-by: Christian König Cc: Marek Olšák Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c index 65f58ebcf835..ceb7847b504f 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c @@ -82,7 +82,8 @@ static void gfxhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev) * to get rid of the VM fault and hardware hang. */ WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, - (max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18) + 0x1); + max((adev->gmc.vram_end >> 18) + 0x1, + adev->gmc.agp_end >> 18)); else WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18); diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c index 80698b5ffa4a..14649f8475f3 100644 --- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c +++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c @@ -100,7 +100,8 @@ static void mmhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev) * to get rid of the VM fault and hardware hang. */ WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, - (max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18) + 0x1); + max((adev->gmc.vram_end >> 18) + 0x1, + adev->gmc.agp_end >> 18)); else WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18);