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From 71f0a8227045b3ffacf87299e130cd4bc41a3338 Mon Sep 17 00:00:00 2001
From: Huang Rui <ray.huang@amd.com>
Date: Fri, 21 Sep 2018 18:15:01 +0800
Subject: [PATCH 5330/5725] drm/amdgpu: fix the page fault of raven2
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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.
Change-Id: I4f775c01857a3c8111f2145023ad15c4e94f0b26
Signed-off-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Cc: Marek Olšák <marek.olsak@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c | 16 ++++++++++++++--
drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c | 16 ++++++++++++++--
2 files changed, 28 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 ffd0ec9..ceb7847 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
@@ -73,8 +73,20 @@ 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 >> 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);
/* 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 21a822f..cca6c1b 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c
@@ -84,8 +84,20 @@ 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 >> 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);
/* Set default page address. */
value = adev->vram_scratch.gpu_addr - adev->gmc.vram_start +
--
2.7.4
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