From 760067769ebb3fad2ebf1880ad87afb309ef7b14 Mon Sep 17 00:00:00 2001 From: Huang Rui Date: Tue, 16 Jan 2018 10:42:58 +0800 Subject: [PATCH] drm/amdgpu: fix the VM fault while write at the top of the invisible vram Raven2 has a HW issue that it is unable to use the vram which is out of MC_VM_SYSTEM_APERTURE_HIGH_ADDR. So here is the workaround that increase system aperture high address to get rid of the VM fault and hardware hang. Signed-off-by: Huang Rui Reviewed-by: Alex Deucher Reviewed-by: Hawking Zhang Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c | 15 +++++++++++++-- drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c | 15 +++++++++++++-- 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c index ffd0ec9586d1..65f58ebcf835 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c @@ -73,8 +73,19 @@ static void gfxhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev) /* Program the system aperture low logical page number. */ WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_LOW_ADDR, min(adev->gmc.vram_start, adev->gmc.agp_start) >> 18); - WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, - max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18); + + if (adev->asic_type == CHIP_RAVEN && adev->rev_id >= 0x8) + /* + * Raven2 has a HW issue that it is unable to use the vram which + * is out of MC_VM_SYSTEM_APERTURE_HIGH_ADDR. So here is the + * workaround that increase system aperture high address (add 1) + * 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); + else + WREG32_SOC15(GC, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, + max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18); /* Set default page address. */ value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c index b121eb6a0ad4..2a126c6950c7 100644 --- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c +++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c @@ -91,8 +91,19 @@ static void mmhub_v1_0_init_system_aperture_regs(struct amdgpu_device *adev) /* Program the system aperture low logical page number. */ WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_LOW_ADDR, min(adev->gmc.vram_start, adev->gmc.agp_start) >> 18); - WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, - max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18); + + if (adev->asic_type == CHIP_RAVEN && adev->rev_id >= 0x8) + /* + * Raven2 has a HW issue that it is unable to use the vram which + * is out of MC_VM_SYSTEM_APERTURE_HIGH_ADDR. So here is the + * workaround that increase system aperture high address (add 1) + * 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); + else + WREG32_SOC15(MMHUB, 0, mmMC_VM_SYSTEM_APERTURE_HIGH_ADDR, + max(adev->gmc.vram_end, adev->gmc.agp_end) >> 18); /* Set default page address. */ value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start + -- 2.30.2