/* * Copyright 2014 Advanced Micro Devices, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * *//* * Authors: *    Christian König <christian.koenig@amd.com> */ #include <linux/firmware.h>#include <linux/module.h>#include <linux/mmu_notifier.h>#include <linux/interval_tree.h>#include <drm/drmP.h>#include <drm/drm.h> #include "amdgpu.h" struct amdgpu_mn {	/* constant after initialisation */	struct amdgpu_device	*adev;	struct mm_struct	*mm;	struct mmu_notifier	mn; 	/* only used on destruction */	struct work_struct	work; 	/* protected by adev->mn_lock */	struct hlist_node	node; 	/* objects protected by lock */	struct mutex		lock;	struct rb_root		objects;}; struct amdgpu_mn_node {	struct interval_tree_node	it;	struct list_head		bos;}; /** * amdgpu_mn_destroy - destroy the rmn * * @work: previously sheduled work item * * Lazy destroys the notifier from a work item */static void amdgpu_mn_destroy(struct work_struct *work){	struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);	struct amdgpu_device *adev = rmn->adev;	struct amdgpu_mn_node *node, *next_node;	struct amdgpu_bo *bo, *next_bo; 	mutex_lock(&adev->mn_lock);	mutex_lock(&rmn->lock);	hash_del(&rmn->node);	rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,					     it.rb) {		list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {			bo->mn = NULL;			list_del_init(&bo->mn_list);		}		kfree(node);	}	mutex_unlock(&rmn->lock);	mutex_unlock(&adev->mn_lock);	mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);	kfree(rmn);} /** * amdgpu_mn_release - callback to notify about mm destruction * * @mn: our notifier * @mn: the mm this callback is about * * Shedule a work item to lazy destroy our notifier. */static void amdgpu_mn_release(struct mmu_notifier *mn,			      struct mm_struct *mm){	struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);	INIT_WORK(&rmn->work, amdgpu_mn_destroy);	schedule_work(&rmn->work);} /** * amdgpu_mn_invalidate_node - unmap all BOs of a node * * @node: the node with the BOs to unmap * * We block for all BOs and unmap them by move them * into system domain again. */static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,				      unsigned long start,				      unsigned long end){	struct amdgpu_bo *bo;	long r; 	list_for_each_entry(bo, &node->bos, mn_list) { 		if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))			continue; 		r = amdgpu_bo_reserve(bo, true);		if (r) {			DRM_ERROR("(%ld) failed to reserve user bo\n", r);			continue;		} 		r = reservation_object_wait_timeout_rcu(bo->tbo.resv,			true, false, MAX_SCHEDULE_TIMEOUT);		if (r <= 0)			DRM_ERROR("(%ld) failed to wait for user bo\n", r); 		amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);		r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);		if (r)			DRM_ERROR("(%ld) failed to validate user bo\n", r); 		amdgpu_bo_unreserve(bo);	}} /** * amdgpu_mn_invalidate_range_start - callback to notify about mm change * * @mn: our notifier * @mn: the mm this callback is about * @start: start of updated range * @end: end of updated range * * We block for all BOs between start and end to be idle and * unmap them by move them into system domain again. */static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,					     struct mm_struct *mm,					     unsigned long start,					     unsigned long end){	struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);	struct interval_tree_node *it; 	/* notification is exclusive, but interval is inclusive */	end -= 1; 	mutex_lock(&rmn->lock); 	it = interval_tree_iter_first(&rmn->objects, start, end);	while (it) {		struct amdgpu_mn_node *node; 		node = container_of(it, struct amdgpu_mn_node, it);		it = interval_tree_iter_next(it, start, end); 		amdgpu_mn_invalidate_node(node, start, end);	} 	mutex_unlock(&rmn->lock);} static const struct mmu_notifier_ops amdgpu_mn_ops = {	.release = amdgpu_mn_release,	.invalidate_range_start = amdgpu_mn_invalidate_range_start,}; /** * amdgpu_mn_get - create notifier context * * @adev: amdgpu device pointer * * Creates a notifier context for current->mm. */static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev){	struct mm_struct *mm = current->mm;	struct amdgpu_mn *rmn;	int r; 	mutex_lock(&adev->mn_lock);	if (down_write_killable(&mm->mmap_sem)) {		mutex_unlock(&adev->mn_lock);		return ERR_PTR(-EINTR);	} 	hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)		if (rmn->mm == mm)			goto release_locks; 	rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);	if (!rmn) {		rmn = ERR_PTR(-ENOMEM);		goto release_locks;	} 	rmn->adev = adev;	rmn->mm = mm;	rmn->mn.ops = &amdgpu_mn_ops;	mutex_init(&rmn->lock);	rmn->objects = RB_ROOT; 	r = __mmu_notifier_register(&rmn->mn, mm);	if (r)		goto free_rmn; 	hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm); release_locks:	up_write(&mm->mmap_sem);	mutex_unlock(&adev->mn_lock); 	return rmn; free_rmn:	up_write(&mm->mmap_sem);	mutex_unlock(&adev->mn_lock);	kfree(rmn); 	return ERR_PTR(r);} /** * amdgpu_mn_register - register a BO for notifier updates * * @bo: amdgpu buffer object * @addr: userptr addr we should monitor * * Registers an MMU notifier for the given BO at the specified address. * Returns 0 on success, -ERRNO if anything goes wrong. */int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr){	unsigned long end = addr + amdgpu_bo_size(bo) - 1;	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);	struct amdgpu_mn *rmn;	struct amdgpu_mn_node *node = NULL;	struct list_head bos;	struct interval_tree_node *it; 	rmn = amdgpu_mn_get(adev);	if (IS_ERR(rmn))		return PTR_ERR(rmn); 	INIT_LIST_HEAD(&bos); 	mutex_lock(&rmn->lock); 	while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {		kfree(node);		node = container_of(it, struct amdgpu_mn_node, it);		interval_tree_remove(&node->it, &rmn->objects);		addr = min(it->start, addr);		end = max(it->last, end);		list_splice(&node->bos, &bos);	} 	if (!node) {		node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);		if (!node) {			mutex_unlock(&rmn->lock);			return -ENOMEM;		}	} 	bo->mn = rmn; 	node->it.start = addr;	node->it.last = end;	INIT_LIST_HEAD(&node->bos);	list_splice(&bos, &node->bos);	list_add(&bo->mn_list, &node->bos); 	interval_tree_insert(&node->it, &rmn->objects); 	mutex_unlock(&rmn->lock); 	return 0;} /** * amdgpu_mn_unregister - unregister a BO for notifier updates * * @bo: amdgpu buffer object * * Remove any registration of MMU notifier updates from the buffer object. */void amdgpu_mn_unregister(struct amdgpu_bo *bo){	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);	struct amdgpu_mn *rmn;	struct list_head *head; 	mutex_lock(&adev->mn_lock); 	rmn = bo->mn;	if (rmn == NULL) {		mutex_unlock(&adev->mn_lock);		return;	} 	mutex_lock(&rmn->lock); 	/* save the next list entry for later */	head = bo->mn_list.next; 	bo->mn = NULL;	list_del_init(&bo->mn_list); 	if (list_empty(head)) {		struct amdgpu_mn_node *node;		node = container_of(head, struct amdgpu_mn_node, bos);		interval_tree_remove(&node->it, &rmn->objects);		kfree(node);	} 	mutex_unlock(&rmn->lock);	mutex_unlock(&adev->mn_lock);}