Looks you can drop macro 'AMDGPU_DEFAULT_GTT_SIZE_MB' as well.
Regards,
Guchun
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Mukul Joshi
> Sent: Wednesday, April 26, 2023 9:53 AM
> To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Joshi, Mukul <Mukul.Joshi@xxxxxxx>; Kuehling, Felix
> <Felix.Kuehling@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>
> Subject: [PATCH 2/3] drm/amdgpu: Set GTT size equal to TTM mem limit
>
> Use the helper function in TTM to get TTM mem limit and set GTT size to be
> equal to TTL mem limit.
>
> Signed-off-by: Mukul Joshi <mukul.joshi@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 ++++++-------------------
> 1 file changed, 6 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index ce34b73d05bc..ac220c779fc8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -1807,26 +1807,13 @@ int amdgpu_ttm_init(struct amdgpu_device
> *adev)
> DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
> (unsigned) (adev->gmc.real_vram_size / (1024 * 1024)));
>
> - /* Compute GTT size, either based on 1/2 the size of RAM size
> - * or whatever the user passed on module init */
> - if (amdgpu_gtt_size == -1) {
> - struct sysinfo si;
> -
> - si_meminfo(&si);
> - /* Certain GL unit tests for large textures can cause problems
> - * with the OOM killer since there is no way to link this
> memory
> - * to a process. This was originally mitigated (but not
> necessarily
> - * eliminated) by limiting the GTT size. The problem is this
> limit
> - * is often too low for many modern games so just make the
> limit 1/2
> - * of system memory which aligns with TTM. The OOM
> accounting needs
> - * to be addressed, but we shouldn't prevent common 3D
> applications
> - * from being usable just to potentially mitigate that corner
> case.
> - */
> - gtt_size = max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
> - (u64)si.totalram * si.mem_unit / 2);
> - } else {
> + /* Compute GTT size, either based on TTM limit
> + * or whatever the user passed on module init.
> + */
> + if (amdgpu_gtt_size == -1)
> + gtt_size = ttm_tt_pages_limit() << PAGE_SHIFT;
> + else
> gtt_size = (uint64_t)amdgpu_gtt_size << 20;
> - }
>
> /* Initialize GTT memory pool */
> r = amdgpu_gtt_mgr_init(adev, gtt_size);
> --
> 2.35.1
