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From 85969a172fdad2bc4260ee3b7c0566772b9ab617 Mon Sep 17 00:00:00 2001
From: Emily Deng <Emily.Deng@amd.com>
Date: Wed, 10 Oct 2018 15:43:47 +0800
Subject: [PATCH 5530/5725] drm/amdgpu: Limit the max mc address to hole start
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
For the vram_start is 0 case, the gart range will be from 0x0000FFFF00000000
to 0x0000FFFF1FFFFFFF, which will cause the engine hang.
So to avoid the hole, limit the max mc address to AMDGPU_GMC_HOLE_START.:wq
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 999e159..d73367c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -146,6 +146,8 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
{
const uint64_t four_gb = 0x100000000ULL;
u64 size_af, size_bf;
+ /*To avoid the hole, limit the max mc address to AMDGPU_GMC_HOLE_START*/
+ u64 max_mc_address = min(adev->gmc.mc_mask, AMDGPU_GMC_HOLE_START - 1);
mc->gart_size += adev->pm.smu_prv_buffer_size;
@@ -153,7 +155,7 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
* the GART base on a 4GB boundary as well.
*/
size_bf = mc->fb_start;
- size_af = adev->gmc.mc_mask + 1 - ALIGN(mc->fb_end + 1, four_gb);
+ size_af = max_mc_address + 1 - ALIGN(mc->fb_end + 1, four_gb);
if (mc->gart_size > max(size_bf, size_af)) {
dev_warn(adev->dev, "limiting GART\n");
@@ -164,7 +166,7 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
(size_af < mc->gart_size))
mc->gart_start = 0;
else
- mc->gart_start = mc->mc_mask - mc->gart_size + 1;
+ mc->gart_start = max_mc_address - mc->gart_size + 1;
mc->gart_start &= ~(four_gb - 1);
mc->gart_end = mc->gart_start + mc->gart_size - 1;
--
2.7.4
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