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drm/amdgpu/gmc: add a way to force a particular placement for GART

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We normally place GART based on the location of VRAM and the
available address space around that, but provide an option
to force a particular location for hardware that needs it.

v2: Switch to passing the placement via parameter

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2023-09-14 16:23:01 -04:00
parent 52ed23dc29
commit 917f91d8d8
8 changed files with 31 additions and 12 deletions
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22
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
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@@ -269,7 +269,8 @@ void amdgpu_gmc_sysvm_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc
* If GART size is bigger than space left then we ajust GART size.
* Thus function will never fails.
*/
void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
enum amdgpu_gart_placement gart_placement)
{
const uint64_t four_gb = 0x100000000ULL;
u64 size_af, size_bf;
@@ -287,11 +288,22 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
mc->gart_size = max(size_bf, size_af);
}
if ((size_bf >= mc->gart_size && size_bf < size_af) ||
(size_af < mc->gart_size))
mc->gart_start = 0;
else
switch (gart_placement) {
case AMDGPU_GART_PLACEMENT_HIGH:
mc->gart_start = max_mc_address - mc->gart_size + 1;
break;
case AMDGPU_GART_PLACEMENT_LOW:
mc->gart_start = 0;
break;
case AMDGPU_GART_PLACEMENT_BEST_FIT:
default:
if ((size_bf >= mc->gart_size && size_bf < size_af) ||
(size_af < mc->gart_size))
mc->gart_start = 0;
else
mc->gart_start = max_mc_address - mc->gart_size + 1;
break;
}
mc->gart_start &= ~(four_gb - 1);
mc->gart_end = mc->gart_start + mc->gart_size - 1;