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32 results

vmwgfx_cmdbuf_res.c

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  • vmwgfx_cmdbuf_res.c 9.60 KiB
    /**************************************************************************
     *
     * Copyright © 2014 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"
    
    #define VMW_CMDBUF_RES_MAN_HT_ORDER 12
    
    enum vmw_cmdbuf_res_state {
    	VMW_CMDBUF_RES_COMMITED,
    	VMW_CMDBUF_RES_ADD,
    	VMW_CMDBUF_RES_DEL
    };
    
    /**
     * 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);
    		switch (entry->state) {
    		case VMW_CMDBUF_RES_ADD:
    			entry->state = VMW_CMDBUF_RES_COMMITED;
    			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_COMMITED;
    			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.
     *
     * 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_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);
    		break;
    	case VMW_CMDBUF_RES_COMMITED:
    		(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);
    		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;
    }