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drm/amdkfd: Ensure user queue buffers residency

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Add atomic queue_refcount to struct bo_va, return -EBUSY to fail unmap
BO from the GPU if the bo_va queue_refcount is not zero.

Create queue to increase the bo_va queue_refcount, destroy queue to
decrease the bo_va queue_refcount, to ensure the queue buffers mapped on
the GPU when queue is active.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang
2024-06-20 12:31:36 -04:00
committed by Alex Deucher
parent 22a9d5cbf8
commit 834368eab3
5 changed files with 49 additions and 9 deletions
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14
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
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@@ -1252,7 +1252,7 @@ static int unreserve_bo_and_vms(struct bo_vm_reservation_context *ctx,
return ret;
}
static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
static int unmap_bo_from_gpuvm(struct kgd_mem *mem,
struct kfd_mem_attachment *entry,
struct amdgpu_sync *sync)
{
@@ -1260,11 +1260,18 @@ static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
struct amdgpu_device *adev = entry->adev;
struct amdgpu_vm *vm = bo_va->base.vm;
if (bo_va->queue_refcount) {
pr_debug("bo_va->queue_refcount %d\n", bo_va->queue_refcount);
return -EBUSY;
}
amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
amdgpu_sync_fence(sync, bo_va->last_pt_update);
return 0;
}
static int update_gpuvm_pte(struct kgd_mem *mem,
@@ -2191,7 +2198,10 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
pr_debug("\t unmap VA 0x%llx - 0x%llx from entry %p\n",
entry->va, entry->va + bo_size, entry);
unmap_bo_from_gpuvm(mem, entry, ctx.sync);
ret = unmap_bo_from_gpuvm(mem, entry, ctx.sync);
if (ret)
goto unreserve_out;
entry->is_mapped = false;
mem->mapped_to_gpu_memory--;