drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c - linux - Git at Google

 /*
  * Copyright 2015 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 <deathsimple@vodafone.de>
  */

 #include <linux/uaccess.h>

 #include "amdgpu.h"
 #include "amdgpu_trace.h"

 #define AMDGPU_BO_LIST_MAX_PRIORITY	32u
 #define AMDGPU_BO_LIST_NUM_BUCKETS	(AMDGPU_BO_LIST_MAX_PRIORITY + 1)

 static void amdgpu_bo_list_free_rcu(struct rcu_head *rcu)
 {
 	struct amdgpu_bo_list *list = container_of(rcu, struct amdgpu_bo_list,
 						   rhead);

 	kvfree(list);
 }

 static void amdgpu_bo_list_free(struct kref *ref)
 {
 	struct amdgpu_bo_list *list = container_of(ref, struct amdgpu_bo_list,
 						   refcount);
 	struct amdgpu_bo_list_entry *e;

 	amdgpu_bo_list_for_each_entry(e, list) {
 		struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);

 		amdgpu_bo_unref(&bo);
 	}

 	call_rcu(&list->rhead, amdgpu_bo_list_free_rcu);
 }

 int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 			  struct drm_amdgpu_bo_list_entry *info,
 			  unsigned num_entries, struct amdgpu_bo_list **result)
 {
 	unsigned last_entry = 0, first_userptr = num_entries;
 	struct amdgpu_bo_list_entry *array;
 	struct amdgpu_bo_list *list;
 	uint64_t total_size = 0;
 	size_t size;
 	unsigned i;
 	int r;

 	if (num_entries > (SIZE_MAX - sizeof(struct amdgpu_bo_list))
 				/ sizeof(struct amdgpu_bo_list_entry))
 		return -EINVAL;

 	size = sizeof(struct amdgpu_bo_list);
 	size += num_entries * sizeof(struct amdgpu_bo_list_entry);
 	list = kvmalloc(size, GFP_KERNEL);
 	if (!list)
 		return -ENOMEM;

 	kref_init(&list->refcount);
 	list->gds_obj = NULL;
 	list->gws_obj = NULL;
 	list->oa_obj = NULL;

 	array = amdgpu_bo_list_array_entry(list, 0);
 	memset(array, 0, num_entries * sizeof(struct amdgpu_bo_list_entry));

 	for (i = 0; i < num_entries; ++i) {
 		struct amdgpu_bo_list_entry *entry;
 		struct drm_gem_object *gobj;
 		struct amdgpu_bo *bo;
 		struct mm_struct *usermm;

 		gobj = drm_gem_object_lookup(filp, info[i].bo_handle);
 		if (!gobj) {
 			r = -ENOENT;
 			goto error_free;
 		}

 		bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
 		drm_gem_object_put(gobj);

 		usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);
 		if (usermm) {
 			if (usermm != current->mm) {
 				amdgpu_bo_unref(&bo);
 				r = -EPERM;
 				goto error_free;
 			}
 			entry = &array[--first_userptr];
 		} else {
 			entry = &array[last_entry++];
 		}

 		entry->priority = min(info[i].bo_priority,
 				      AMDGPU_BO_LIST_MAX_PRIORITY);
 		entry->tv.bo = &bo->tbo;

 		if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GDS)
 			list->gds_obj = bo;
 		if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GWS)
 			list->gws_obj = bo;
 		if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_OA)
 			list->oa_obj = bo;

 		total_size += amdgpu_bo_size(bo);
 		trace_amdgpu_bo_list_set(list, bo);
 	}

 	list->first_userptr = first_userptr;
 	list->num_entries = num_entries;

 	trace_amdgpu_cs_bo_status(list->num_entries, total_size);

 	*result = list;
 	return 0;

 error_free:
 	for (i = 0; i < last_entry; ++i) {
 		struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);

 		amdgpu_bo_unref(&bo);
 	}
 	for (i = first_userptr; i < num_entries; ++i) {
 		struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);

 		amdgpu_bo_unref(&bo);
 	}
 	kvfree(list);
 	return r;

 }

 static void amdgpu_bo_list_destroy(struct amdgpu_fpriv *fpriv, int id)
 {
 	struct amdgpu_bo_list *list;

 	mutex_lock(&fpriv->bo_list_lock);
 	list = idr_remove(&fpriv->bo_list_handles, id);
 	mutex_unlock(&fpriv->bo_list_lock);
 	if (list)
 		kref_put(&list->refcount, amdgpu_bo_list_free);
 }

 int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
 		       struct amdgpu_bo_list **result)
 {
 	rcu_read_lock();
 	*result = idr_find(&fpriv->bo_list_handles, id);

 	if (*result && kref_get_unless_zero(&(*result)->refcount)) {
 		rcu_read_unlock();
 		return 0;
 	}

 	rcu_read_unlock();
 	return -ENOENT;
 }

 void amdgpu_bo_list_get_list(struct amdgpu_bo_list *list,
 			     struct list_head *validated)
 {
 	/* This is based on the bucket sort with O(n) time complexity.
 	 * An item with priority "i" is added to bucket[i]. The lists are then
 	 * concatenated in descending order.
 	 */
 	struct list_head bucket[AMDGPU_BO_LIST_NUM_BUCKETS];
 	struct amdgpu_bo_list_entry *e;
 	unsigned i;

 	for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 		INIT_LIST_HEAD(&bucket[i]);

 	/* Since buffers which appear sooner in the relocation list are
 	 * likely to be used more often than buffers which appear later
 	 * in the list, the sort mustn't change the ordering of buffers
 	 * with the same priority, i.e. it must be stable.
 	 */
 	amdgpu_bo_list_for_each_entry(e, list) {
 		struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);
 		unsigned priority = e->priority;

 		if (!bo->parent)
 			list_add_tail(&e->tv.head, &bucket[priority]);

 		e->user_pages = NULL;
 	}

 	/* Connect the sorted buckets in the output list. */
 	for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
 		list_splice(&bucket[i], validated);
 }

 void amdgpu_bo_list_put(struct amdgpu_bo_list *list)
 {
 	kref_put(&list->refcount, amdgpu_bo_list_free);
 }

 int amdgpu_bo_create_list_entry_array(struct drm_amdgpu_bo_list_in *in,
 				      struct drm_amdgpu_bo_list_entry **info_param)
 {
 	const void __user *uptr = u64_to_user_ptr(in->bo_info_ptr);
 	const uint32_t info_size = sizeof(struct drm_amdgpu_bo_list_entry);
 	struct drm_amdgpu_bo_list_entry *info;
 	int r;

 	info = kvmalloc_array(in->bo_number, info_size, GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;

 	/* copy the handle array from userspace to a kernel buffer */
 	r = -EFAULT;
 	if (likely(info_size == in->bo_info_size)) {
 		unsigned long bytes = in->bo_number *
 			in->bo_info_size;

 		if (copy_from_user(info, uptr, bytes))
 			goto error_free;

 	} else {
 		unsigned long bytes = min(in->bo_info_size, info_size);
 		unsigned i;

 		memset(info, 0, in->bo_number * info_size);
 		for (i = 0; i < in->bo_number; ++i) {
 			if (copy_from_user(&info[i], uptr, bytes))
 				goto error_free;

 			uptr += in->bo_info_size;
 		}
 	}

 	*info_param = info;
 	return 0;

 error_free:
 	kvfree(info);
 	return r;
 }

 int amdgpu_bo_list_ioctl(struct drm_device *dev, void *data,
 				struct drm_file *filp)
 {
 	struct amdgpu_device *adev = drm_to_adev(dev);
 	struct amdgpu_fpriv *fpriv = filp->driver_priv;
 	union drm_amdgpu_bo_list *args = data;
 	uint32_t handle = args->in.list_handle;
 	struct drm_amdgpu_bo_list_entry *info = NULL;
 	struct amdgpu_bo_list *list, *old;
 	int r;

 	r = amdgpu_bo_create_list_entry_array(&args->in, &info);
 	if (r)
 		return r;

 	switch (args->in.operation) {
 	case AMDGPU_BO_LIST_OP_CREATE:
 		r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
 					  &list);
 		if (r)
 			goto error_free;

 		mutex_lock(&fpriv->bo_list_lock);
 		r = idr_alloc(&fpriv->bo_list_handles, list, 1, 0, GFP_KERNEL);
 		mutex_unlock(&fpriv->bo_list_lock);
 		if (r < 0) {
 			goto error_put_list;
 		}

 		handle = r;
 		break;

 	case AMDGPU_BO_LIST_OP_DESTROY:
 		amdgpu_bo_list_destroy(fpriv, handle);
 		handle = 0;
 		break;

 	case AMDGPU_BO_LIST_OP_UPDATE:
 		r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
 					  &list);
 		if (r)
 			goto error_free;

 		mutex_lock(&fpriv->bo_list_lock);
 		old = idr_replace(&fpriv->bo_list_handles, list, handle);
 		mutex_unlock(&fpriv->bo_list_lock);

 		if (IS_ERR(old)) {
 			r = PTR_ERR(old);
 			goto error_put_list;
 		}

 		amdgpu_bo_list_put(old);
 		break;

 	default:
 		r = -EINVAL;
 		goto error_free;
 	}

 	memset(args, 0, sizeof(*args));
 	args->out.list_handle = handle;
 	kvfree(info);

 	return 0;

 error_put_list:
 	amdgpu_bo_list_put(list);

 error_free:
 	kvfree(info);
 	return r;
 }
	/*
	* Copyright 2015 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 <deathsimple@vodafone.de>
	*/

	#include <linux/uaccess.h>

	#include "amdgpu.h"
	#include "amdgpu_trace.h"

	#define AMDGPU_BO_LIST_MAX_PRIORITY 32u
	#define AMDGPU_BO_LIST_NUM_BUCKETS (AMDGPU_BO_LIST_MAX_PRIORITY + 1)

	static void amdgpu_bo_list_free_rcu(struct rcu_head *rcu)
	{
	struct amdgpu_bo_list *list = container_of(rcu, struct amdgpu_bo_list,
	rhead);

	kvfree(list);
	}

	static void amdgpu_bo_list_free(struct kref *ref)
	{
	struct amdgpu_bo_list *list = container_of(ref, struct amdgpu_bo_list,
	refcount);
	struct amdgpu_bo_list_entry *e;

	amdgpu_bo_list_for_each_entry(e, list) {
	struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);

	amdgpu_bo_unref(&bo);
	}

	call_rcu(&list->rhead, amdgpu_bo_list_free_rcu);
	}

	int amdgpu_bo_list_create(struct amdgpu_device adev, struct drm_file filp,
	struct drm_amdgpu_bo_list_entry *info,
	unsigned num_entries, struct amdgpu_bo_list **result)
	{
	unsigned last_entry = 0, first_userptr = num_entries;
	struct amdgpu_bo_list_entry *array;
	struct amdgpu_bo_list *list;
	uint64_t total_size = 0;
	size_t size;
	unsigned i;
	int r;

	if (num_entries > (SIZE_MAX - sizeof(struct amdgpu_bo_list))
	/ sizeof(struct amdgpu_bo_list_entry))
	return -EINVAL;

	size = sizeof(struct amdgpu_bo_list);
	size += num_entries * sizeof(struct amdgpu_bo_list_entry);
	list = kvmalloc(size, GFP_KERNEL);
	if (!list)
	return -ENOMEM;

	kref_init(&list->refcount);
	list->gds_obj = NULL;
	list->gws_obj = NULL;
	list->oa_obj = NULL;

	array = amdgpu_bo_list_array_entry(list, 0);
	memset(array, 0, num_entries * sizeof(struct amdgpu_bo_list_entry));

	for (i = 0; i < num_entries; ++i) {
	struct amdgpu_bo_list_entry *entry;
	struct drm_gem_object *gobj;
	struct amdgpu_bo *bo;
	struct mm_struct *usermm;

	gobj = drm_gem_object_lookup(filp, info[i].bo_handle);
	if (!gobj) {
	r = -ENOENT;
	goto error_free;
	}

	bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
	drm_gem_object_put(gobj);

	usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);
	if (usermm) {
	if (usermm != current->mm) {
	amdgpu_bo_unref(&bo);
	r = -EPERM;
	goto error_free;
	}
	entry = &array[--first_userptr];
	} else {
	entry = &array[last_entry++];
	}

	entry->priority = min(info[i].bo_priority,
	AMDGPU_BO_LIST_MAX_PRIORITY);
	entry->tv.bo = &bo->tbo;

	if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GDS)
	list->gds_obj = bo;
	if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_GWS)
	list->gws_obj = bo;
	if (bo->preferred_domains == AMDGPU_GEM_DOMAIN_OA)
	list->oa_obj = bo;

	total_size += amdgpu_bo_size(bo);
	trace_amdgpu_bo_list_set(list, bo);
	}

	list->first_userptr = first_userptr;
	list->num_entries = num_entries;

	trace_amdgpu_cs_bo_status(list->num_entries, total_size);

	*result = list;
	return 0;

	error_free:
	for (i = 0; i < last_entry; ++i) {
	struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);

	amdgpu_bo_unref(&bo);
	}
	for (i = first_userptr; i < num_entries; ++i) {
	struct amdgpu_bo *bo = ttm_to_amdgpu_bo(array[i].tv.bo);

	amdgpu_bo_unref(&bo);
	}
	kvfree(list);
	return r;

	}

	static void amdgpu_bo_list_destroy(struct amdgpu_fpriv *fpriv, int id)
	{
	struct amdgpu_bo_list *list;

	mutex_lock(&fpriv->bo_list_lock);
	list = idr_remove(&fpriv->bo_list_handles, id);
	mutex_unlock(&fpriv->bo_list_lock);
	if (list)
	kref_put(&list->refcount, amdgpu_bo_list_free);
	}

	int amdgpu_bo_list_get(struct amdgpu_fpriv *fpriv, int id,
	struct amdgpu_bo_list **result)
	{
	rcu_read_lock();
	*result = idr_find(&fpriv->bo_list_handles, id);

	if (result && kref_get_unless_zero(&(result)->refcount)) {
	rcu_read_unlock();
	return 0;
	}

	rcu_read_unlock();
	return -ENOENT;
	}

	void amdgpu_bo_list_get_list(struct amdgpu_bo_list *list,
	struct list_head *validated)
	{
	/* This is based on the bucket sort with O(n) time complexity.
	* An item with priority "i" is added to bucket[i]. The lists are then
	* concatenated in descending order.
	*/
	struct list_head bucket[AMDGPU_BO_LIST_NUM_BUCKETS];
	struct amdgpu_bo_list_entry *e;
	unsigned i;

	for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
	INIT_LIST_HEAD(&bucket[i]);

	/* Since buffers which appear sooner in the relocation list are
	* likely to be used more often than buffers which appear later
	* in the list, the sort mustn't change the ordering of buffers
	* with the same priority, i.e. it must be stable.
	*/
	amdgpu_bo_list_for_each_entry(e, list) {
	struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);
	unsigned priority = e->priority;

	if (!bo->parent)
	list_add_tail(&e->tv.head, &bucket[priority]);

	e->user_pages = NULL;
	}

	/* Connect the sorted buckets in the output list. */
	for (i = 0; i < AMDGPU_BO_LIST_NUM_BUCKETS; i++)
	list_splice(&bucket[i], validated);
	}

	void amdgpu_bo_list_put(struct amdgpu_bo_list *list)
	{
	kref_put(&list->refcount, amdgpu_bo_list_free);
	}

	int amdgpu_bo_create_list_entry_array(struct drm_amdgpu_bo_list_in *in,
	struct drm_amdgpu_bo_list_entry **info_param)
	{
	const void __user *uptr = u64_to_user_ptr(in->bo_info_ptr);
	const uint32_t info_size = sizeof(struct drm_amdgpu_bo_list_entry);
	struct drm_amdgpu_bo_list_entry *info;
	int r;

	info = kvmalloc_array(in->bo_number, info_size, GFP_KERNEL);
	if (!info)
	return -ENOMEM;

	/* copy the handle array from userspace to a kernel buffer */
	r = -EFAULT;
	if (likely(info_size == in->bo_info_size)) {
	unsigned long bytes = in->bo_number *
	in->bo_info_size;

	if (copy_from_user(info, uptr, bytes))
	goto error_free;

	} else {
	unsigned long bytes = min(in->bo_info_size, info_size);
	unsigned i;

	memset(info, 0, in->bo_number * info_size);
	for (i = 0; i < in->bo_number; ++i) {
	if (copy_from_user(&info[i], uptr, bytes))
	goto error_free;

	uptr += in->bo_info_size;
	}
	}

	*info_param = info;
	return 0;

	error_free:
	kvfree(info);
	return r;
	}

	int amdgpu_bo_list_ioctl(struct drm_device dev, void data,
	struct drm_file *filp)
	{
	struct amdgpu_device *adev = drm_to_adev(dev);
	struct amdgpu_fpriv *fpriv = filp->driver_priv;
	union drm_amdgpu_bo_list *args = data;
	uint32_t handle = args->in.list_handle;
	struct drm_amdgpu_bo_list_entry *info = NULL;
	struct amdgpu_bo_list list, old;
	int r;

	r = amdgpu_bo_create_list_entry_array(&args->in, &info);
	if (r)
	return r;

	switch (args->in.operation) {
	case AMDGPU_BO_LIST_OP_CREATE:
	r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
	&list);
	if (r)
	goto error_free;

	mutex_lock(&fpriv->bo_list_lock);
	r = idr_alloc(&fpriv->bo_list_handles, list, 1, 0, GFP_KERNEL);
	mutex_unlock(&fpriv->bo_list_lock);
	if (r < 0) {
	goto error_put_list;
	}

	handle = r;
	break;

	case AMDGPU_BO_LIST_OP_DESTROY:
	amdgpu_bo_list_destroy(fpriv, handle);
	handle = 0;
	break;

	case AMDGPU_BO_LIST_OP_UPDATE:
	r = amdgpu_bo_list_create(adev, filp, info, args->in.bo_number,
	&list);
	if (r)
	goto error_free;

	mutex_lock(&fpriv->bo_list_lock);
	old = idr_replace(&fpriv->bo_list_handles, list, handle);
	mutex_unlock(&fpriv->bo_list_lock);

	if (IS_ERR(old)) {
	r = PTR_ERR(old);
	goto error_put_list;
	}

	amdgpu_bo_list_put(old);
	break;

	default:
	r = -EINVAL;
	goto error_free;
	}

	memset(args, 0, sizeof(*args));
	args->out.list_handle = handle;
	kvfree(info);

	return 0;

	error_put_list:
	amdgpu_bo_list_put(list);

	error_free:
	kvfree(info);
	return r;
	}