diff options
Diffstat (limited to 'drivers/gpu/ion/ion_priv.h')
| -rw-r--r-- | drivers/gpu/ion/ion_priv.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/gpu/ion/ion_priv.h b/drivers/gpu/ion/ion_priv.h index 3323954..cf5fe60 100644 --- a/drivers/gpu/ion/ion_priv.h +++ b/drivers/gpu/ion/ion_priv.h @@ -22,6 +22,7 @@ #include <linux/mutex.h> #include <linux/rbtree.h> #include <linux/ion.h> +#include <linux/miscdevice.h> struct ion_mapping; @@ -35,6 +36,77 @@ struct ion_kernel_mapping { void *vaddr; }; +/** + * struct ion_device - the metadata of the ion device node + * @dev: the actual misc device + * @buffers: an rb tree of all the existing buffers + * @lock: lock protecting the buffers & heaps trees + * @heaps: list of all the heaps in the system + * @user_clients: list of all the clients created from userspace + */ +struct ion_device { + struct miscdevice dev; + struct rb_root buffers; + struct mutex lock; + struct rb_root heaps; + long (*custom_ioctl) (struct ion_client *client, unsigned int cmd, + unsigned long arg); + struct rb_root user_clients; + struct rb_root kernel_clients; + struct dentry *debug_root; +}; + +/** + * struct ion_client - a process/hw block local address space + * @ref: for reference counting the client + * @node: node in the tree of all clients + * @dev: backpointer to ion device + * @handles: an rb tree of all the handles in this client + * @lock: lock protecting the tree of handles + * @heap_mask: mask of all supported heaps + * @name: used for debugging + * @task: used for debugging + * + * A client represents a list of buffers this client may access. + * The mutex stored here is used to protect both handles tree + * as well as the handles themselves, and should be held while modifying either. + */ +struct ion_client { + struct kref ref; + struct rb_node node; + struct ion_device *dev; + struct rb_root handles; + struct mutex lock; + unsigned int heap_mask; + const char *name; + struct task_struct *task; + pid_t pid; + struct dentry *debug_root; +}; + +/** + * ion_handle - a client local reference to a buffer + * @ref: reference count + * @client: back pointer to the client the buffer resides in + * @buffer: pointer to the buffer + * @node: node in the client's handle rbtree + * @kmap_cnt: count of times this client has mapped to kernel + * @dmap_cnt: count of times this client has mapped for dma + * @usermap_cnt: count of times this client has mapped for userspace + * + * Modifications to node, map_cnt or mapping should be protected by the + * lock in the client. Other fields are never changed after initialization. + */ +struct ion_handle { + struct kref ref; + struct ion_client *client; + struct ion_buffer *buffer; + struct rb_node node; + unsigned int kmap_cnt; + unsigned int dmap_cnt; + unsigned int usermap_cnt; +}; + struct ion_buffer *ion_handle_buffer(struct ion_handle *handle); /** |