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drm/amdkfd: use GTT for VRAM on APUs only if GTT is larger

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If the user has configured a large carveout on a small APU,
only use GTT for VRAM allocations if GTT is larger than
VRAM.

v2: fix reversed check (Philip)

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2025-01-30 15:20:05 -05:00
parent 8b0d068e7d
commit 759e764f7d
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -1987,8 +1987,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
(unsigned int)(gtt_size / (1024 * 1024)));
if (adev->flags & AMD_IS_APU)
adev->apu_prefer_gtt = true;
if (adev->flags & AMD_IS_APU) {
if (adev->gmc.real_vram_size < gtt_size)
adev->apu_prefer_gtt = true;
}
/* Initialize doorbell pool on PCI BAR */
r = amdgpu_ttm_init_on_chip(adev, AMDGPU_PL_DOORBELL, adev->doorbell.size / PAGE_SIZE);