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