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drm/amdgpu: Simplify eviction fence handling 

Temporarily removing eviction fences to avoid triggering them by
accident is no longer necessary due to the fence_owner logic in
amdgpu_sync_resv.

As a result the ef_list usage of amdgpu_amdkfd_remove_eviction_fence
and amdgpu_amdkfd_add_eviction_fence are no longer needed.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2019-02-04 18:17:26 -05:00 committed by Alex Deucher
parent 8db588d5d3
commit 2d086fded1
1 changed files with 11 additions and 123 deletions
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134
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
View File

@ -204,38 +204,25 @@ void amdgpu_amdkfd_unreserve_memory_limit(struct amdgpu_bo *bo)
}
/* amdgpu_amdkfd_remove_eviction_fence - Removes eviction fence(s) from BO's
/* amdgpu_amdkfd_remove_eviction_fence - Removes eviction fence from BO's
* reservation object.
*
* @bo: [IN] Remove eviction fence(s) from this BO
* @ef: [IN] If ef is specified, then this eviction fence is removed if it
* @ef: [IN] This eviction fence is removed if it
* is present in the shared list.
* @ef_list: [OUT] Returns list of eviction fences. These fences are removed
* from BO's reservation object shared list.
* @ef_count: [OUT] Number of fences in ef_list.
*
* NOTE: If called with ef_list, then amdgpu_amdkfd_add_eviction_fence must be
* called to restore the eviction fences and to avoid memory leak. This is
* useful for shared BOs.
* NOTE: Must be called with BO reserved i.e. bo->tbo.resv->lock held.
*/
static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
struct amdgpu_amdkfd_fence *ef,
struct amdgpu_amdkfd_fence ***ef_list,
unsigned int *ef_count)
struct amdgpu_amdkfd_fence *ef)
{
struct reservation_object *resv = bo->tbo.resv;
struct reservation_object_list *old, *new;
unsigned int i, j, k;
if (!ef && !ef_list)
if (!ef)
return -EINVAL;
if (ef_list) {
*ef_list = NULL;
*ef_count = 0;
}
old = reservation_object_get_list(resv);
if (!old)
return 0;
@ -254,8 +241,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
f = rcu_dereference_protected(old->shared[i],
reservation_object_held(resv));
if ((ef && f->context == ef->base.context) ||
(!ef && to_amdgpu_amdkfd_fence(f)))
if (f->context == ef->base.context)
RCU_INIT_POINTER(new->shared[--j], f);
else
RCU_INIT_POINTER(new->shared[k++], f);
@ -263,21 +249,6 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
new->shared_max = old->shared_max;
new->shared_count = k;
if (!ef) {
unsigned int count = old->shared_count - j;
/* Alloc memory for count number of eviction fence pointers.
* Fill the ef_list array and ef_count
*/
*ef_list = kcalloc(count, sizeof(**ef_list), GFP_KERNEL);
*ef_count = count;
if (!*ef_list) {
kfree(new);
return -ENOMEM;
}
}
/* Install the new fence list, seqcount provides the barriers */
preempt_disable();
write_seqcount_begin(&resv->seq);
@ -291,46 +262,13 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
f = rcu_dereference_protected(new->shared[i],
reservation_object_held(resv));
if (!ef)
(*ef_list)[k++] = to_amdgpu_amdkfd_fence(f);
else
dma_fence_put(f);
dma_fence_put(f);
}
kfree_rcu(old, rcu);
return 0;
}
/* amdgpu_amdkfd_add_eviction_fence - Adds eviction fence(s) back into BO's
* reservation object.
*
* @bo: [IN] Add eviction fences to this BO
* @ef_list: [IN] List of eviction fences to be added
* @ef_count: [IN] Number of fences in ef_list.
*
* NOTE: Must call amdgpu_amdkfd_remove_eviction_fence before calling this
* function.
*/
static void amdgpu_amdkfd_add_eviction_fence(struct amdgpu_bo *bo,
struct amdgpu_amdkfd_fence **ef_list,
unsigned int ef_count)
{
int i;
if (!ef_list || !ef_count)
return;
for (i = 0; i < ef_count; i++) {
amdgpu_bo_fence(bo, &ef_list[i]->base, true);
/* Re-adding the fence takes an additional reference. Drop that
* reference.
*/
dma_fence_put(&ef_list[i]->base);
}
kfree(ef_list);
}
static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
bool wait)
{
@ -346,18 +284,8 @@ static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
if (ret)
goto validate_fail;
if (wait) {
struct amdgpu_amdkfd_fence **ef_list;
unsigned int ef_count;
ret = amdgpu_amdkfd_remove_eviction_fence(bo, NULL, &ef_list,
&ef_count);
if (ret)
goto validate_fail;
if (wait)
amdgpu_bo_sync_wait(bo, AMDGPU_FENCE_OWNER_KFD, false);
amdgpu_amdkfd_add_eviction_fence(bo, ef_list, ef_count);
}
validate_fail:
return ret;
@ -444,7 +372,6 @@ static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
{
int ret;
struct kfd_bo_va_list *bo_va_entry;
struct amdgpu_bo *pd = vm->root.base.bo;
struct amdgpu_bo *bo = mem->bo;
uint64_t va = mem->va;
struct list_head *list_bo_va = &mem->bo_va_list;
@ -484,14 +411,8 @@ static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
*p_bo_va_entry = bo_va_entry;
/* Allocate new page tables if needed and validate
* them. Clearing of new page tables and validate need to wait
* on move fences. We don't want that to trigger the eviction
* fence, so remove it temporarily.
* them.
*/
amdgpu_amdkfd_remove_eviction_fence(pd,
vm->process_info->eviction_fence,
NULL, NULL);
ret = amdgpu_vm_alloc_pts(adev, vm, va, amdgpu_bo_size(bo));
if (ret) {
pr_err("Failed to allocate pts, err=%d\n", ret);
@ -504,13 +425,9 @@ static int add_bo_to_vm(struct amdgpu_device *adev, struct kgd_mem *mem,
goto err_alloc_pts;
}
/* Add the eviction fence back */
amdgpu_bo_fence(pd, &vm->process_info->eviction_fence->base, true);
return 0;
err_alloc_pts:
amdgpu_bo_fence(pd, &vm->process_info->eviction_fence->base, true);
amdgpu_vm_bo_rmv(adev, bo_va_entry->bo_va);
list_del(&bo_va_entry->bo_list);
err_vmadd:
@ -809,24 +726,11 @@ static int unmap_bo_from_gpuvm(struct amdgpu_device *adev,
{
struct amdgpu_bo_va *bo_va = entry->bo_va;
struct amdgpu_vm *vm = bo_va->base.vm;
struct amdgpu_bo *pd = vm->root.base.bo;
/* Remove eviction fence from PD (and thereby from PTs too as
* they share the resv. object). Otherwise during PT update
* job (see amdgpu_vm_bo_update_mapping), eviction fence would
* get added to job->sync object and job execution would
* trigger the eviction fence.
*/
amdgpu_amdkfd_remove_eviction_fence(pd,
vm->process_info->eviction_fence,
NULL, NULL);
amdgpu_vm_bo_unmap(adev, bo_va, entry->va);
amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
/* Add the eviction fence back */
amdgpu_bo_fence(pd, &vm->process_info->eviction_fence->base, true);
amdgpu_sync_fence(NULL, sync, bo_va->last_pt_update, false);
return 0;
@ -1389,8 +1293,7 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
* attached
*/
amdgpu_amdkfd_remove_eviction_fence(mem->bo,
process_info->eviction_fence,
NULL, NULL);
process_info->eviction_fence);
pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
mem->va + bo_size * (1 + mem->aql_queue));
@ -1617,8 +1520,7 @@ int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
if (mem->mapped_to_gpu_memory == 0 &&
!amdgpu_ttm_tt_get_usermm(mem->bo->tbo.ttm) && !mem->bo->pin_count)
amdgpu_amdkfd_remove_eviction_fence(mem->bo,
process_info->eviction_fence,
NULL, NULL);
process_info->eviction_fence);
unreserve_out:
unreserve_bo_and_vms(&ctx, false, false);
@ -1679,7 +1581,7 @@ int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct kgd_dev *kgd,
}
amdgpu_amdkfd_remove_eviction_fence(
bo, mem->process_info->eviction_fence, NULL, NULL);
bo, mem->process_info->eviction_fence);
list_del_init(&mem->validate_list.head);
if (size)
@ -1945,16 +1847,6 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
amdgpu_sync_create(&sync);
/* Avoid triggering eviction fences when unmapping invalid
* userptr BOs (waits for all fences, doesn't use
* FENCE_OWNER_VM)
*/
list_for_each_entry(peer_vm, &process_info->vm_list_head,
vm_list_node)
amdgpu_amdkfd_remove_eviction_fence(peer_vm->root.base.bo,
process_info->eviction_fence,
NULL, NULL);
ret = process_validate_vms(process_info);
if (ret)
goto unreserve_out;
@ -2015,10 +1907,6 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
ret = process_update_pds(process_info, &sync);
unreserve_out:
list_for_each_entry(peer_vm, &process_info->vm_list_head,
vm_list_node)
amdgpu_bo_fence(peer_vm->root.base.bo,
&process_info->eviction_fence->base, true);
ttm_eu_backoff_reservation(&ticket, &resv_list);
amdgpu_sync_wait(&sync, false);
amdgpu_sync_free(&sync);