[PATCH 27/27] drm/amdgpu: Fix GTT size calculation

[Kuehling, Felix]

From: Kent Russell <kent.russell at amd.com>

GTT size is currently limited to the minimum of VRAM size or 3/4 of
system memory. This severely limits the quanitity of system memory
that can be used by ROCm application.

Increase GTT size to the maximum of VRAM size or system memory size.

Signed-off-by: Kent Russell <kent.russell at amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index c14198737dcd..e9ecc3953673 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1740,11 +1740,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 		struct sysinfo si;
 
 		si_meminfo(&si);
-		gtt_size = min(max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
-			       adev->gmc.mc_vram_size),
-			       ((uint64_t)si.totalram * si.mem_unit * 3/4));
-	}
-	else
+		gtt_size = max3((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
+				adev->gmc.mc_vram_size,
+				((uint64_t)si.totalram * si.mem_unit));
+	} else
 		gtt_size = (uint64_t)amdgpu_gtt_size << 20;
 
 	/* Initialize GTT memory pool */
-- 
2.17.1