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.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 19 +++++++++++++++----
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 7 +++++++
2 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index c7793db6d098..c41321c456fe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -286,11 +286,22 @@ 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 (mc->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;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index fdc25cd559b6..caa15639d3d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -197,6 +197,12 @@ struct amdgpu_mem_partition_info {
#define INVALID_PFN -1
+enum amdgpu_gart_placement {
+ AMDGPU_GART_PLACEMENT_BEST_FIT = 0,
+ AMDGPU_GART_PLACEMENT_HIGH,
+ AMDGPU_GART_PLACEMENT_LOW,
+};
+
struct amdgpu_gmc {
/* FB's physical address in MMIO space (for CPU to
* map FB). This is different compared to the agp/
@@ -333,6 +339,7 @@ struct amdgpu_gmc {
u64 MC_VM_MX_L1_TLB_CNTL;
u64 noretry_flags;
+ enum amdgpu_gart_placement gart_placement;
};
#define amdgpu_gmc_flush_gpu_tlb(adev, vmid, vmhub, type) ((adev)->gmc.gmc_funcs->flush_gpu_tlb((adev), (vmid), (vmhub), (type)))
--
2.41.0
