dma-heap.h
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* DMABUF Heaps Allocation Infrastructure
*
* Copyright (C) 2011 Google, Inc.
* Copyright (C) 2019 Linaro Ltd.
*/
#ifndef _DMA_HEAPS_H
#define _DMA_HEAPS_H
#include <linux/cdev.h>
#include <linux/types.h>
struct dma_heap;
/**
* struct dma_heap_ops - ops to operate on a given heap
* @allocate: allocate dmabuf and return struct dma_buf ptr
*
* allocate returns dmabuf on success, ERR_PTR(-errno) on error.
*/
struct dma_heap_ops {
struct dma_buf *(*allocate)(struct dma_heap *heap,
unsigned long len,
unsigned long fd_flags,
unsigned long heap_flags);
};
/**
* struct dma_heap_export_info - information needed to export a new dmabuf heap
* @name: used for debugging/device-node name
* @ops: ops struct for this heap
* @priv: heap exporter private data
*
* Information needed to export a new dmabuf heap.
*/
struct dma_heap_export_info {
const char *name;
const struct dma_heap_ops *ops;
void *priv;
};
/**
* dma_heap_get_drvdata() - get per-heap driver data
* @heap: DMA-Heap to retrieve private data for
*
* Returns:
* The per-heap data for the heap.
*/
void *dma_heap_get_drvdata(struct dma_heap *heap);
/**
* dma_heap_get_dev() - get device struct for the heap
* @heap: DMA-Heap to retrieve device struct from
*
* Returns:
* The device struct for the heap.
*/
struct device *dma_heap_get_dev(struct dma_heap *heap);
/**
* dma_heap_add - adds a heap to dmabuf heaps
* @exp_info: information needed to register this heap
*/
struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
/**
* dma_heap_put - drops a reference to a dmabuf heaps, potentially freeing it
* @heap: heap pointer
*/
void dma_heap_put(struct dma_heap *heap);
/**
* dma_heap_find - Returns the registered dma_heap with the specified name
* @name: Name of the heap to find
*
* NOTE: dma_heaps returned from this function MUST be released
* using dma_heap_put() when the user is done.
*/
struct dma_heap *dma_heap_find(const char *name);
/**
* dma_heap_buffer_alloc - Allocate dma-buf from a dma_heap
* @heap: dma_heap to allocate from
* @len: size to allocate
* @fd_flags: flags to set on returned dma-buf fd
* @heap_flags: flags to pass to the dma heap
*
* This is for internal dma-buf allocations only.
*/
struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
unsigned int fd_flags,
unsigned int heap_flags);
/** dma_heap_buffer_free - Free dma_buf allocated by dma_heap_buffer_alloc
* @dma_buf: dma_buf to free
*
* This is really only a simple wrapper to dma_buf_put()
*/
void dma_heap_buffer_free(struct dma_buf *);
/**
* dma_heap_bufferfd_alloc - Allocate dma-buf fd from a dma_heap
* @heap: dma_heap to allocate from
* @len: size to allocate
* @fd_flags: flags to set on returned dma-buf fd
* @heap_flags: flags to pass to the dma heap
*/
int dma_heap_bufferfd_alloc(struct dma_heap *heap, size_t len,
unsigned int fd_flags,
unsigned int heap_flags);
#endif /* _DMA_HEAPS_H */