On 2023-01-16 17:11, Errabolu, Ramesh wrote:
[AMD Official Use Only - General]
Comment inline.
Regards,
Ramesh
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Felix Kuehling
Sent: Thursday, January 12, 2023 7:02 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Chen, Xiaogang <Xiaogang.Chen@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>
Subject: [PATCH 4/6] drm/amdgpu: Attach eviction fence on alloc
Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
Instead of attaching the eviction fence when a KFD BO is first mapped, attach it when it is allocated or imported. This in preparation to allow KFD BOs to be mapped using the render node API.
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 63 ++++++++++---------
1 file changed, 32 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 5645103beed0..79213f476493 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -360,6 +360,24 @@ static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
return ret;
}
+static int amdgpu_amdkfd_bo_validate_and_fence(struct amdgpu_bo *bo,
+ uint32_t domain,
+ struct dma_fence *fence)
+{
+ int ret = amdgpu_bo_reserve(bo, false);
+
+ if (ret)
+ return ret;
+
+ ret = amdgpu_amdkfd_bo_validate(bo, domain, true);
+ if (!ret)
Ramesh: Should space for fences be reserved before adding one.
Yes, I probably should. I think I fixed this in the later patch because
I didn't see the problem until I fixed those other issues.
+ dma_resv_add_fence(bo->tbo.base.resv, fence,
+ DMA_RESV_USAGE_BOOKKEEP);
+ amdgpu_bo_unreserve(bo);
+
+ return ret;
+}
+
static int amdgpu_amdkfd_validate_vm_bo(void *_unused, struct amdgpu_bo *bo) {
return amdgpu_amdkfd_bo_validate(bo, bo->allowed_domains, false);
@@ -1720,6 +1738,11 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
}
bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
+ } else {
+ ret = amdgpu_amdkfd_bo_validate_and_fence(bo, domain,
+ &avm->process_info->eviction_fence->base);
+ if (ret)
+ goto err_validate_bo;
}
if (offset)
@@ -1729,6 +1752,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
allocate_init_user_pages_failed:
err_pin_bo:
+err_validate_bo:
remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
drm_vma_node_revoke(&gobj->vma_node, drm_priv);
err_node_allow:
@@ -1804,10 +1828,6 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
if (unlikely(ret))
return ret;
- /* The eviction fence should be removed by the last unmap.
- * TODO: Log an error condition if the bo still has the eviction fence
- * attached
- */
amdgpu_amdkfd_remove_eviction_fence(mem->bo,
process_info->eviction_fence);
Ramesh: Is it correct to call remove_eviction() unconditionally? This procedure applies to GTT and VRAM BO's only. Furthermore, the fence on these BO's has already been removed in the unmap_memory() call.
This patch removes the amdgpu_amdkfd_remove_eviction_fence from
amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu. So we definitely need to do
this here.
amdgpu_amdkfd_remove_eviction_fence uses dma_resv_replace_fences. If the
specified fence is not found in the BO's reservation object, it is a
no-op. So calling this unconditionally is safe.
Regards,
Felix
pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
@@ -1931,19 +1951,6 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
if (unlikely(ret))
goto out_unreserve;
- if (mem->mapped_to_gpu_memory == 0 &&
- !amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
- /* Validate BO only once. The eviction fence gets added to BO
- * the first time it is mapped. Validate will wait for all
- * background evictions to complete.
- */
- ret = amdgpu_amdkfd_bo_validate(bo, domain, true);
- if (ret) {
- pr_debug("Validate failed\n");
- goto out_unreserve;
- }
- }
-
list_for_each_entry(entry, &mem->attachments, list) {
if (entry->bo_va->base.vm != avm || entry->is_mapped)
continue;
@@ -1970,10 +1977,6 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
mem->mapped_to_gpu_memory);
}
- if (!amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) && !bo->tbo.pin_count)
- dma_resv_add_fence(bo->tbo.base.resv,
- &avm->process_info->eviction_fence->base,
- DMA_RESV_USAGE_BOOKKEEP);
ret = unreserve_bo_and_vms(&ctx, false, false);
goto out;
@@ -1990,7 +1993,6 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
struct amdgpu_device *adev, struct kgd_mem *mem, void *drm_priv) {
struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
- struct amdkfd_process_info *process_info = avm->process_info;
unsigned long bo_size = mem->bo->tbo.base.size;
struct kfd_mem_attachment *entry;
struct bo_vm_reservation_context ctx; @@ -2031,15 +2033,6 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
mem->mapped_to_gpu_memory);
}
- /* If BO is unmapped from all VMs, unfence it. It can be evicted if
- * required.
- */
- if (mem->mapped_to_gpu_memory == 0 &&
- !amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) &&
- !mem->bo->tbo.pin_count)
- amdgpu_amdkfd_remove_eviction_fence(mem->bo,
- process_info->eviction_fence);
-
unreserve_out:
unreserve_bo_and_vms(&ctx, false, false);
out:
@@ -2266,8 +2259,16 @@ int amdgpu_amdkfd_gpuvm_import_dmabuf(struct amdgpu_device *adev,
amdgpu_sync_create(&(*mem)->sync);
(*mem)->is_imported = true;
+ ret = amdgpu_amdkfd_bo_validate_and_fence(bo, (*mem)->domain,
+ &avm->process_info->eviction_fence->base);
+ if (ret)
+ goto err_remove_mem;
+
return 0;
+err_remove_mem:
+ remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
+ drm_vma_node_revoke(&obj->vma_node, drm_priv);
err_free_mem:
kfree(*mem);
err_put_obj:
--
2.34.1
