From: Christian König <christian.koenig@amd.com>
Date: Wed, 4 Dec 2019 12:29:49 +0000 (+0100)
Subject: drm/amdgpu: add VM eviction lock v3
X-Git-Tag: v5.6-rc1~114^2~21^2~24
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b4ff0f8a85f3c523942e57b716e8722e7f6799cc;p=linux.git

drm/amdgpu: add VM eviction lock v3

This allows to invalidate VM entries without taking the reservation lock.

v3: use -EBUSY

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 81cbb8105a68..8f26504a59a7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -656,7 +656,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 			      void *param)
 {
 	struct amdgpu_vm_bo_base *bo_base, *tmp;
-	int r = 0;
+	int r;
 
 	vm->bulk_moveable &= list_empty(&vm->evicted);
 
@@ -665,7 +665,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 
 		r = validate(param, bo);
 		if (r)
-			break;
+			return r;
 
 		if (bo->tbo.type != ttm_bo_type_kernel) {
 			amdgpu_vm_bo_moved(bo_base);
@@ -678,7 +678,11 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		}
 	}
 
-	return r;
+	mutex_lock(&vm->eviction_lock);
+	vm->evicting = false;
+	mutex_unlock(&vm->eviction_lock);
+
+	return 0;
 }
 
 /**
@@ -1555,15 +1559,25 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	if (!(flags & AMDGPU_PTE_VALID))
 		owner = AMDGPU_FENCE_OWNER_KFD;
 
+	mutex_lock(&vm->eviction_lock);
+	if (vm->evicting) {
+		r = -EBUSY;
+		goto error_unlock;
+	}
+
 	r = vm->update_funcs->prepare(&params, owner, exclusive);
 	if (r)
-		return r;
+		goto error_unlock;
 
 	r = amdgpu_vm_update_ptes(&params, start, last + 1, addr, flags);
 	if (r)
-		return r;
+		goto error_unlock;
 
-	return vm->update_funcs->commit(&params, fence);
+	r = vm->update_funcs->commit(&params, fence);
+
+error_unlock:
+	mutex_unlock(&vm->eviction_lock);
+	return r;
 }
 
 /**
@@ -2518,11 +2532,19 @@ bool amdgpu_vm_evictable(struct amdgpu_bo *bo)
 	if (!dma_resv_test_signaled_rcu(bo->tbo.base.resv, true))
 		return false;
 
+	/* Try to block ongoing updates */
+	if (!mutex_trylock(&bo_base->vm->eviction_lock))
+		return false;
+
 	/* Don't evict VM page tables while they are updated */
 	if (!dma_fence_is_signaled(bo_base->vm->last_direct) ||
-	    !dma_fence_is_signaled(bo_base->vm->last_delayed))
+	    !dma_fence_is_signaled(bo_base->vm->last_delayed)) {
+		mutex_unlock(&bo_base->vm->eviction_lock);
 		return false;
+	}
 
+	bo_base->vm->evicting = true;
+	mutex_unlock(&bo_base->vm->eviction_lock);
 	return true;
 }
 
@@ -2769,6 +2791,9 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 	vm->last_direct = dma_fence_get_stub();
 	vm->last_delayed = dma_fence_get_stub();
 
+	mutex_init(&vm->eviction_lock);
+	vm->evicting = false;
+
 	amdgpu_vm_bo_param(adev, vm, adev->vm_manager.root_level, false, &bp);
 	if (vm_context == AMDGPU_VM_CONTEXT_COMPUTE)
 		bp.flags &= ~AMDGPU_GEM_CREATE_SHADOW;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 6c2124b10820..7e0eb36da27d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -239,6 +239,10 @@ struct amdgpu_vm {
 	/* tree of virtual addresses mapped */
 	struct rb_root_cached	va;
 
+	/* Lock to prevent eviction while we are updating page tables */
+	struct mutex		eviction_lock;
+	bool			evicting;
+
 	/* BOs who needs a validation */
 	struct list_head	evicted;