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/**************************************************************************

 *

 * Copyright © 2014-2015 VMware, Inc., Palo Alto, CA., USA

 * 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 above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * 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.

 *

 **************************************************************************/

#include "vmwgfx_drv.h"

#include "vmwgfx_resource_priv.h"

#define VMW_CMDBUF_RES_MAN_HT_ORDER 12

/**

 * struct vmw_cmdbuf_res - Command buffer managed resource entry.

 *

 * @res: Refcounted pointer to a struct vmw_resource.

 * @hash: Hash entry for the manager hash table.

 * @head: List head used either by the staging list or the manager list

 * of commited resources.

 * @state: Staging state of this resource entry.

 * @man: Pointer to a resource manager for this entry.

 */

struct vmw_cmdbuf_res {

	struct vmw_resource *res;

	struct drm_hash_item hash;

	struct list_head head;

	enum vmw_cmdbuf_res_state state;

	struct vmw_cmdbuf_res_manager *man;

};

/**

 * struct vmw_cmdbuf_res_manager - Command buffer resource manager.

 *

 * @resources: Hash table containing staged and commited command buffer

 * resources

 * @list: List of commited command buffer resources.

 * @dev_priv: Pointer to a device private structure.

 *

 * @resources and @list are protected by the cmdbuf mutex for now.

 */

struct vmw_cmdbuf_res_manager {

	struct drm_open_hash resources;

	struct list_head list;

	struct vmw_private *dev_priv;

};

/**

 * vmw_cmdbuf_res_lookup - Look up a command buffer resource

 *

 * @man: Pointer to the command buffer resource manager

 * @resource_type: The resource type, that combined with the user key

 * identifies the resource.

 * @user_key: The user key.

 *

 * Returns a valid refcounted struct vmw_resource pointer on success,

 * an error pointer on failure.

 */

struct vmw_resource *

vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager *man,

		      enum vmw_cmdbuf_res_type res_type,

		      u32 user_key)

{

	struct drm_hash_item *hash;

	int ret;

	unsigned long key = user_key | (res_type << 24);

	ret = drm_ht_find_item(&man->resources, key, &hash);

	if (unlikely(ret != 0))

		return ERR_PTR(ret);

	return vmw_resource_reference

		(drm_hash_entry(hash, struct vmw_cmdbuf_res, hash)->res);

}

/**

 * vmw_cmdbuf_res_free - Free a command buffer resource.

 *

 * @man: Pointer to the command buffer resource manager

 * @entry: Pointer to a struct vmw_cmdbuf_res.

 *

 * Frees a struct vmw_cmdbuf_res entry and drops its reference to the

 * struct vmw_resource.

 */

static void vmw_cmdbuf_res_free(struct vmw_cmdbuf_res_manager *man,

				struct vmw_cmdbuf_res *entry)

{

	list_del(&entry->head);

	WARN_ON(drm_ht_remove_item(&man->resources, &entry->hash));

	vmw_resource_unreference(&entry->res);

	kfree(entry);

}

/**

 * vmw_cmdbuf_res_commit - Commit a list of command buffer resource actions

 *

 * @list: Caller's list of command buffer resource actions.

 *

 * This function commits a list of command buffer resource

 * additions or removals.

 * It is typically called when the execbuf ioctl call triggering these

 * actions has commited the fifo contents to the device.

 */

void vmw_cmdbuf_res_commit(struct list_head *list)

{

	struct vmw_cmdbuf_res *entry, *next;

	list_for_each_entry_safe(entry, next, list, head) {

		list_del(&entry->head);

		if (entry->res->func->commit_notify)

			entry->res->func->commit_notify(entry->res,

							entry->state);

		switch (entry->state) {

		case VMW_CMDBUF_RES_ADD:

			entry->state = VMW_CMDBUF_RES_COMMITTED;

			list_add_tail(&entry->head, &entry->man->list);

			break;

		case VMW_CMDBUF_RES_DEL:

			vmw_resource_unreference(&entry->res);

			kfree(entry);

			break;

		default:

			BUG();

			break;

		}

	}

}

/**

 * vmw_cmdbuf_res_revert - Revert a list of command buffer resource actions

 *

 * @man: Pointer to the command buffer resource manager

 * @list: Caller's list of command buffer resource action

 *

 * This function reverts a list of command buffer resource

 * additions or removals.

 * It is typically called when the execbuf ioctl call triggering these

 * actions failed for some reason, and the command stream was never

 * submitted.

 */

void vmw_cmdbuf_res_revert(struct list_head *list)

{

	struct vmw_cmdbuf_res *entry, *next;

	int ret;

	list_for_each_entry_safe(entry, next, list, head) {

		switch (entry->state) {

		case VMW_CMDBUF_RES_ADD:

			vmw_cmdbuf_res_free(entry->man, entry);

			break;

		case VMW_CMDBUF_RES_DEL:

			ret = drm_ht_insert_item(&entry->man->resources,

						 &entry->hash);

			list_del(&entry->head);

			list_add_tail(&entry->head, &entry->man->list);

			entry->state = VMW_CMDBUF_RES_COMMITTED;

			break;

		default:

			BUG();

			break;

		}

	}

}

/**

 * vmw_cmdbuf_res_add - Stage a command buffer managed resource for addition.

 *

 * @man: Pointer to the command buffer resource manager.

 * @res_type: The resource type.

 * @user_key: The user-space id of the resource.

 * @res: Valid (refcount != 0) pointer to a struct vmw_resource.

 * @list: The staging list.

 *

 * This function allocates a struct vmw_cmdbuf_res entry and adds the

 * resource to the hash table of the manager identified by @man. The

 * entry is then put on the staging list identified by @list.

 */

int vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager *man,

		       enum vmw_cmdbuf_res_type res_type,

		       u32 user_key,

		       struct vmw_resource *res,

		       struct list_head *list)

{

	struct vmw_cmdbuf_res *cres;

	int ret;

	cres = kzalloc(sizeof(*cres), GFP_KERNEL);

	if (unlikely(cres == NULL))

		return -ENOMEM;

	cres->hash.key = user_key | (res_type << 24);

	ret = drm_ht_insert_item(&man->resources, &cres->hash);

	if (unlikely(ret != 0))

		goto out_invalid_key;

	cres->state = VMW_CMDBUF_RES_ADD;

	cres->res = vmw_resource_reference(res);

	cres->man = man;

	list_add_tail(&cres->head, list);

out_invalid_key:

	return ret;

}

/**

 * vmw_cmdbuf_res_remove - Stage a command buffer managed resource for removal.

 *

 * @man: Pointer to the command buffer resource manager.

 * @res_type: The resource type.

 * @user_key: The user-space id of the resource.

 * @list: The staging list.

 * @res_p: If the resource is in an already committed state, points to the

 * struct vmw_resource on successful return. The pointer will be

 * non ref-counted.

 *

 * This function looks up the struct vmw_cmdbuf_res entry from the manager

 * hash table and, if it exists, removes it. Depending on its current staging

 * state it then either removes the entry from the staging list or adds it

 * to it with a staging state of removal.

 */

int vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager *man,

			  enum vmw_cmdbuf_res_type res_type,

			  u32 user_key,

			  struct list_head *list,

			  struct vmw_resource **res_p)

{

	struct vmw_cmdbuf_res *entry;

	struct drm_hash_item *hash;

	int ret;

	ret = drm_ht_find_item(&man->resources, user_key | (res_type << 24),

			       &hash);

	if (likely(ret != 0))

		return -EINVAL;

	entry = drm_hash_entry(hash, struct vmw_cmdbuf_res, hash);

	switch (entry->state) {

	case VMW_CMDBUF_RES_ADD:

		vmw_cmdbuf_res_free(man, entry);

		*res_p = NULL;

		break;

	case VMW_CMDBUF_RES_COMMITTED:

		(void) drm_ht_remove_item(&man->resources, &entry->hash);

		list_del(&entry->head);

		entry->state = VMW_CMDBUF_RES_DEL;

		list_add_tail(&entry->head, list);

		*res_p = entry->res;

		break;

	default:

		BUG();

		break;

	}

	return 0;

}

/**

 * vmw_cmdbuf_res_man_create - Allocate a command buffer managed resource

 * manager.

 *

 * @dev_priv: Pointer to a struct vmw_private

 *

 * Allocates and initializes a command buffer managed resource manager. Returns

 * an error pointer on failure.

 */

struct vmw_cmdbuf_res_manager *

vmw_cmdbuf_res_man_create(struct vmw_private *dev_priv)

{

	struct vmw_cmdbuf_res_manager *man;

	int ret;

	man = kzalloc(sizeof(*man), GFP_KERNEL);

	if (man == NULL)

		return ERR_PTR(-ENOMEM);

	man->dev_priv = dev_priv;

	INIT_LIST_HEAD(&man->list);

	ret = drm_ht_create(&man->resources, VMW_CMDBUF_RES_MAN_HT_ORDER);

	if (ret == 0)

		return man;

	kfree(man);

	return ERR_PTR(ret);

}

/**

 * vmw_cmdbuf_res_man_destroy - Destroy a command buffer managed resource

 * manager.

 *

 * @man: Pointer to the  manager to destroy.

 *

 * This function destroys a command buffer managed resource manager and

 * unreferences / frees all command buffer managed resources and -entries

 * associated with it.

 */

void vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager *man)

{

	struct vmw_cmdbuf_res *entry, *next;

	list_for_each_entry_safe(entry, next, &man->list, head)

		vmw_cmdbuf_res_free(man, entry);

	kfree(man);

}

/**

 *

 * vmw_cmdbuf_res_man_size - Return the size of a command buffer managed

 * resource manager

 *

 * Returns the approximate allocation size of a command buffer managed

 * resource manager.

 */

size_t vmw_cmdbuf_res_man_size(void)

{

	static size_t res_man_size;

	if (unlikely(res_man_size == 0))

		res_man_size =

			ttm_round_pot(sizeof(struct vmw_cmdbuf_res_manager)) +

			ttm_round_pot(sizeof(struct hlist_head) <<

				      VMW_CMDBUF_RES_MAN_HT_ORDER);

	return res_man_size;

}