--- /dev/null
+/**************************************************************************
+ *
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff