304 lines
10 KiB
C
304 lines
10 KiB
C
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/*
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* drivers/gpu/ion/ion_priv.h
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*
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* Copyright (C) 2011 Google, Inc.
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* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _ION_PRIV_H
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#define _ION_PRIV_H
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#include <linux/ion.h>
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#include <linux/kref.h>
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#include <linux/mm_types.h>
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#include <linux/mutex.h>
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#include <linux/rbtree.h>
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#include <linux/seq_file.h>
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#include "msm_ion_priv.h"
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#include <linux/sched.h>
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#include <linux/shrinker.h>
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#include <linux/types.h>
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struct ion_buffer *ion_handle_buffer(struct ion_handle *handle);
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/**
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* struct ion_buffer - metadata for a particular buffer
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* @ref: refernce count
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* @node: node in the ion_device buffers tree
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* @dev: back pointer to the ion_device
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* @heap: back pointer to the heap the buffer came from
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* @flags: buffer specific flags
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* @size: size of the buffer
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* @priv_virt: private data to the buffer representable as
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* a void *
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* @priv_phys: private data to the buffer representable as
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* an ion_phys_addr_t (and someday a phys_addr_t)
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* @lock: protects the buffers cnt fields
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* @kmap_cnt: number of times the buffer is mapped to the kernel
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* @vaddr: the kenrel mapping if kmap_cnt is not zero
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* @dmap_cnt: number of times the buffer is mapped for dma
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* @sg_table: the sg table for the buffer if dmap_cnt is not zero
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* @dirty: bitmask representing which pages of this buffer have
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* been dirtied by the cpu and need cache maintenance
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* before dma
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* @vmas: list of vma's mapping this buffer
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* @handle_count: count of handles referencing this buffer
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* @task_comm: taskcomm of last client to reference this buffer in a
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* handle, used for debugging
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* @pid: pid of last client to reference this buffer in a
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* handle, used for debugging
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*/
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struct ion_buffer {
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struct kref ref;
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union {
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struct rb_node node;
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struct list_head list;
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};
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struct ion_device *dev;
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struct ion_heap *heap;
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unsigned long flags;
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size_t size;
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union {
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void *priv_virt;
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ion_phys_addr_t priv_phys;
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};
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struct mutex lock;
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int kmap_cnt;
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void *vaddr;
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int dmap_cnt;
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struct sg_table *sg_table;
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unsigned long *dirty;
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struct list_head vmas;
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/* used to track orphaned buffers */
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int handle_count;
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char task_comm[TASK_COMM_LEN];
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pid_t pid;
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};
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/**
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* struct ion_heap_ops - ops to operate on a given heap
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* @allocate: allocate memory
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* @free: free memory
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* @phys get physical address of a buffer (only define on
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* physically contiguous heaps)
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* @map_dma map the memory for dma to a scatterlist
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* @unmap_dma unmap the memory for dma
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* @map_kernel map memory to the kernel
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* @unmap_kernel unmap memory to the kernel
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* @map_user map memory to userspace
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* @unmap_user unmap memory to userspace
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*/
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struct ion_heap_ops {
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int (*allocate) (struct ion_heap *heap,
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struct ion_buffer *buffer, unsigned long len,
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unsigned long align, unsigned long flags);
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void (*free) (struct ion_buffer *buffer);
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int (*phys) (struct ion_heap *heap, struct ion_buffer *buffer,
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ion_phys_addr_t *addr, size_t *len);
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struct sg_table *(*map_dma) (struct ion_heap *heap,
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struct ion_buffer *buffer);
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void (*unmap_dma) (struct ion_heap *heap, struct ion_buffer *buffer);
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void * (*map_kernel) (struct ion_heap *heap, struct ion_buffer *buffer);
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void (*unmap_kernel) (struct ion_heap *heap, struct ion_buffer *buffer);
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int (*map_user) (struct ion_heap *mapper, struct ion_buffer *buffer,
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struct vm_area_struct *vma);
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void (*unmap_user) (struct ion_heap *mapper, struct ion_buffer *buffer);
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int (*print_debug)(struct ion_heap *heap, struct seq_file *s,
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const struct rb_root *mem_map);
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int (*secure_heap)(struct ion_heap *heap, int version, void *data);
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int (*unsecure_heap)(struct ion_heap *heap, int version, void *data);
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int (*secure_buffer)(struct ion_buffer *buffer, int version,
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void *data, int flags);
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int (*unsecure_buffer)(struct ion_buffer *buffer, int force_unsecure);
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};
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/**
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* heap flags - flags between the heaps and core ion code
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*/
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#define ION_HEAP_FLAG_DEFER_FREE (1 << 0)
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/**
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* struct ion_heap - represents a heap in the system
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* @node: rb node to put the heap on the device's tree of heaps
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* @dev: back pointer to the ion_device
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* @type: type of heap
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* @ops: ops struct as above
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* @flags: flags
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* @id: id of heap, also indicates priority of this heap when
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* allocating. These are specified by platform data and
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* MUST be unique
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* @name: used for debugging
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* @priv: private heap data
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* @free_list: free list head if deferred free is used
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* @lock: protects the free list
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* @waitqueue: queue to wait on from deferred free thread
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* @task: task struct of deferred free thread
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* @debug_show: called when heap debug file is read to add any
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* heap specific debug info to output
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*
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* Represents a pool of memory from which buffers can be made. In some
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* systems the only heap is regular system memory allocated via vmalloc.
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* On others, some blocks might require large physically contiguous buffers
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* that are allocated from a specially reserved heap.
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*/
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struct ion_heap {
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struct plist_node node;
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struct ion_device *dev;
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enum ion_heap_type type;
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struct ion_heap_ops *ops;
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unsigned long flags;
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unsigned int id;
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const char *name;
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void *priv;
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struct list_head free_list;
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struct rt_mutex lock;
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wait_queue_head_t waitqueue;
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struct task_struct *task;
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int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
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};
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/**
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* ion_buffer_cached - this ion buffer is cached
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* @buffer: buffer
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*
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* indicates whether this ion buffer is cached
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*/
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bool ion_buffer_cached(struct ion_buffer *buffer);
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/**
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* ion_buffer_fault_user_mappings - fault in user mappings of this buffer
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* @buffer: buffer
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*
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* indicates whether userspace mappings of this buffer will be faulted
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* in, this can affect how buffers are allocated from the heap.
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*/
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bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer);
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/**
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* ion_device_create - allocates and returns an ion device
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* @custom_ioctl: arch specific ioctl function if applicable
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*
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* returns a valid device or -PTR_ERR
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*/
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struct ion_device *ion_device_create(long (*custom_ioctl)
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(struct ion_client *client,
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unsigned int cmd,
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unsigned long arg));
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/**
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* ion_device_destroy - free and device and it's resource
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* @dev: the device
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*/
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void ion_device_destroy(struct ion_device *dev);
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/**
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* ion_device_add_heap - adds a heap to the ion device
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* @dev: the device
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* @heap: the heap to add
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*/
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void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap);
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/**
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* some helpers for common operations on buffers using the sg_table
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* and vaddr fields
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*/
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void *ion_heap_map_kernel(struct ion_heap *, struct ion_buffer *);
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void ion_heap_unmap_kernel(struct ion_heap *, struct ion_buffer *);
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int ion_heap_map_user(struct ion_heap *, struct ion_buffer *,
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struct vm_area_struct *);
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int ion_heap_buffer_zero(struct ion_buffer *buffer);
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/**
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* functions for creating and destroying the built in ion heaps.
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* architectures can add their own custom architecture specific
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* heaps as appropriate.
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*/
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struct ion_heap *ion_heap_create(struct ion_platform_heap *);
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void ion_heap_destroy(struct ion_heap *);
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struct ion_heap *ion_system_heap_create(struct ion_platform_heap *);
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void ion_system_heap_destroy(struct ion_heap *);
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struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *);
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void ion_system_contig_heap_destroy(struct ion_heap *);
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struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *);
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void ion_carveout_heap_destroy(struct ion_heap *);
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struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *);
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void ion_chunk_heap_destroy(struct ion_heap *);
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/**
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* kernel api to allocate/free from carveout -- used when carveout is
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* used to back an architecture specific custom heap
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*/
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ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap, unsigned long size,
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unsigned long align);
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void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
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unsigned long size);
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/**
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* The carveout heap returns physical addresses, since 0 may be a valid
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* physical address, this is used to indicate allocation failed
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*/
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#define ION_CARVEOUT_ALLOCATE_FAIL -1
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/**
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* functions for creating and destroying a heap pool -- allows you
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* to keep a pool of pre allocated memory to use from your heap. Keeping
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* a pool of memory that is ready for dma, ie any cached mapping have been
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* invalidated from the cache, provides a significant peformance benefit on
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* many systems */
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/**
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* struct ion_page_pool - pagepool struct
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* @high_count: number of highmem items in the pool
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* @low_count: number of lowmem items in the pool
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* @high_items: list of highmem items
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* @low_items: list of lowmem items
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* @shrinker: a shrinker for the items
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* @mutex: lock protecting this struct and especially the count
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* item list
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* @alloc: function to be used to allocate pageory when the pool
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* is empty
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* @free: function to be used to free pageory back to the system
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* when the shrinker fires
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* @gfp_mask: gfp_mask to use from alloc
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* @order: order of pages in the pool
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* @list: plist node for list of pools
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*
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* Allows you to keep a pool of pre allocated pages to use from your heap.
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* Keeping a pool of pages that is ready for dma, ie any cached mapping have
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* been invalidated from the cache, provides a significant peformance benefit
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* on many systems
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*/
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struct ion_page_pool {
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int high_count;
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int low_count;
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struct list_head high_items;
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struct list_head low_items;
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struct mutex mutex;
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void *(*alloc)(struct ion_page_pool *pool);
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void (*free)(struct ion_page_pool *pool, struct page *page);
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gfp_t gfp_mask;
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unsigned int order;
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struct plist_node list;
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};
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struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
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void ion_page_pool_destroy(struct ion_page_pool *);
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void *ion_page_pool_alloc(struct ion_page_pool *);
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void ion_page_pool_free(struct ion_page_pool *, struct page *);
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#endif /* _ION_PRIV_H */
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