drm/amdgpu: check userptrs mm earlier

Instead of when we try to bind it check the usermm when
we try to use it in the IOCTLs.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -2364,7 +2364,7 @@ void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *rbo, u32 domain);
 bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
 int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
 				     uint32_t flags);
-bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm);
+struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm);
 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,
 				  unsigned long end);
 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm);

drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c

@@ -93,6 +93,7 @@ static int amdgpu_bo_list_set(struct amdgpu_device *adev,
 
 	bool has_userptr = false;
 	unsigned i;
+	int r;
 
 	array = drm_malloc_ab(num_entries, sizeof(struct amdgpu_bo_list_entry));
 	if (!array)
@@ -102,17 +103,26 @@ static int amdgpu_bo_list_set(struct amdgpu_device *adev,
 	for (i = 0; i < num_entries; ++i) {
 		struct amdgpu_bo_list_entry *entry = &array[i];
 		struct drm_gem_object *gobj;
+		struct mm_struct *usermm;
 
 		gobj = drm_gem_object_lookup(adev->ddev, filp, info[i].bo_handle);
-		if (!gobj)
+		if (!gobj) {
+			r = -ENOENT;
 			goto error_free;
+		}
 
 		entry->robj = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
 		drm_gem_object_unreference_unlocked(gobj);
 		entry->priority = min(info[i].bo_priority,
 				      AMDGPU_BO_LIST_MAX_PRIORITY);
-		if (amdgpu_ttm_tt_has_userptr(entry->robj->tbo.ttm))
+		usermm = amdgpu_ttm_tt_get_usermm(entry->robj->tbo.ttm);
+		if (usermm) {
+			if (usermm != current->mm) {
+				r = -EPERM;
+				goto error_free;
+			}
 			has_userptr = true;
+		}
 		entry->tv.bo = &entry->robj->tbo;
 		entry->tv.shared = true;
 
@@ -142,7 +152,7 @@ static int amdgpu_bo_list_set(struct amdgpu_device *adev,
 
 error_free:
 	drm_free_large(array);
-	return -ENOENT;
+	return r;
 }
 
 struct amdgpu_bo_list *

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -101,7 +101,7 @@ static int amdgpu_cs_user_fence_chunk(struct amdgpu_cs_parser *p,
 	p->uf.bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
 	p->uf.offset = fence_data->offset;
 
-	if (amdgpu_ttm_tt_has_userptr(p->uf.bo->tbo.ttm)) {
+	if (amdgpu_ttm_tt_get_usermm(p->uf.bo->tbo.ttm)) {
 		drm_gem_object_unreference_unlocked(gobj);
 		return -EINVAL;
 	}
@@ -296,8 +296,13 @@ int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,
 
 	list_for_each_entry(lobj, validated, tv.head) {
 		struct amdgpu_bo *bo = lobj->robj;
+		struct mm_struct *usermm;
 		uint32_t domain;
 
+		usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);
+		if (usermm && usermm != current->mm)
+			return -EPERM;
+
 		if (bo->pin_count)
 			continue;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c

@@ -310,7 +310,7 @@ int amdgpu_mode_dumb_mmap(struct drm_file *filp,
 		return -ENOENT;
 	}
 	robj = gem_to_amdgpu_bo(gobj);
-	if (amdgpu_ttm_tt_has_userptr(robj->tbo.ttm) ||
+	if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm) ||
 	    (robj->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
 		drm_gem_object_unreference_unlocked(gobj);
 		return -EPERM;
@@ -638,7 +638,7 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
 		break;
 	}
 	case AMDGPU_GEM_OP_SET_PLACEMENT:
-		if (amdgpu_ttm_tt_has_userptr(robj->tbo.ttm)) {
+		if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm)) {
 			r = -EPERM;
 			amdgpu_bo_unreserve(robj);
 			break;

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -370,7 +370,7 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
 	int r, i;
 	unsigned fpfn, lpfn;
 
-	if (amdgpu_ttm_tt_has_userptr(bo->tbo.ttm))
+	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
 		return -EPERM;
 
 	if (WARN_ON_ONCE(min_offset > max_offset))

drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c

@@ -121,7 +121,7 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
 {
 	struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
 
-	if (amdgpu_ttm_tt_has_userptr(bo->tbo.ttm))
+	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
 		return ERR_PTR(-EPERM);
 
 	return drm_gem_prime_export(dev, gobj, flags);

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -499,9 +499,6 @@ static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 	enum dma_data_direction direction = write ?
 		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
 
-	if (current->mm != gtt->usermm)
-		return -EPERM;
-
 	if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
 		/* check that we only pin down anonymous memory
 		   to prevent problems with writeback */
@@ -773,14 +770,14 @@ int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
 	return 0;
 }
 
-bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm)
+struct mm_struct *amdgpu_ttm_tt_get_usermm(struct ttm_tt *ttm)
 {
 	struct amdgpu_ttm_tt *gtt = (void *)ttm;
 
 	if (gtt == NULL)
-		return false;
+		return NULL;
 
-	return !!gtt->userptr;
+	return gtt->usermm;
 }
 
 bool amdgpu_ttm_tt_affect_userptr(struct ttm_tt *ttm, unsigned long start,