/* SPDX-License-Identifier: GPL-2.0 */
|
/*
|
* DMABUF Heaps Allocation Infrastructure
|
*
|
* Copyright (C) 2011 Google, Inc.
|
* Copyright (C) 2019 Linaro Ltd.
|
* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
|
* Author: Simon Xue <xxm@rock-chips.com>
|
*/
|
|
#ifndef _RK_DMA_HEAPS_H
|
#define _RK_DMA_HEAPS_H
|
|
#include <linux/cdev.h>
|
#include <linux/types.h>
|
#include <linux/dma-buf.h>
|
#include <linux/rk-dma-heap.h>
|
|
#if defined(CONFIG_DMABUF_RK_HEAPS_DEBUG_PRINT)
|
#define dma_heap_print(fmt, ...) \
|
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
|
#else
|
#define dma_heap_print(fmt, ...) \
|
no_printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
|
#endif
|
|
#define RK_DMA_HEAP_NAME_LEN 16
|
|
struct rk_vmap_pfn_data {
|
unsigned long pfn; /* first pfn of contiguous */
|
pgprot_t prot;
|
};
|
|
/**
|
* struct rk_dma_heap_ops - ops to operate on a given heap
|
* @allocate: allocate dmabuf and return struct dma_buf ptr
|
* @get_pool_size: if heap maintains memory pools, get pool size in bytes
|
*
|
* allocate returns dmabuf on success, ERR_PTR(-errno) on error.
|
*/
|
struct rk_dma_heap_ops {
|
struct dma_buf *(*allocate)(struct rk_dma_heap *heap,
|
unsigned long len,
|
unsigned long fd_flags,
|
unsigned long heap_flags,
|
const char *name);
|
struct page *(*alloc_contig_pages)(struct rk_dma_heap *heap,
|
size_t len, const char *name);
|
void (*free_contig_pages)(struct rk_dma_heap *heap,
|
struct page *pages, size_t len,
|
const char *name);
|
long (*get_pool_size)(struct rk_dma_heap *heap);
|
};
|
|
/**
|
* struct rk_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 rk_dma_heap_export_info {
|
const char *name;
|
const struct rk_dma_heap_ops *ops;
|
void *priv;
|
bool support_cma;
|
};
|
|
/**
|
* struct rk_dma_heap - represents a dmabuf heap in the system
|
* @name: used for debugging/device-node name
|
* @ops: ops struct for this heap
|
* @heap_devt heap device node
|
* @list list head connecting to list of heaps
|
* @heap_cdev heap char device
|
* @heap_dev heap device struct
|
*
|
* Represents a heap of memory from which buffers can be made.
|
*/
|
struct rk_dma_heap {
|
const char *name;
|
const struct rk_dma_heap_ops *ops;
|
void *priv;
|
dev_t heap_devt;
|
struct list_head list;
|
struct list_head dmabuf_list; /* dmabuf attach to this node */
|
struct mutex dmabuf_lock;
|
struct list_head contig_list; /* contig buffer attach to this node */
|
struct mutex contig_lock;
|
struct cdev heap_cdev;
|
struct kref refcount;
|
struct device *heap_dev;
|
bool support_cma;
|
struct seq_file *s;
|
struct proc_dir_entry *procfs;
|
unsigned long total_size;
|
};
|
|
struct rk_dma_heap_dmabuf {
|
struct list_head node;
|
struct dma_buf *dmabuf;
|
const char *orig_alloc;
|
phys_addr_t start;
|
phys_addr_t end;
|
};
|
|
struct rk_dma_heap_contig_buf {
|
struct list_head node;
|
const char *orig_alloc;
|
phys_addr_t start;
|
phys_addr_t end;
|
};
|
|
/**
|
* rk_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 *rk_dma_heap_get_drvdata(struct rk_dma_heap *heap);
|
|
/**
|
* rk_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 *rk_dma_heap_get_dev(struct rk_dma_heap *heap);
|
|
/**
|
* rk_dma_heap_get_name() - get heap name
|
* @heap: DMA-Heap to retrieve private data for
|
*
|
* Returns:
|
* The char* for the heap name.
|
*/
|
const char *rk_dma_heap_get_name(struct rk_dma_heap *heap);
|
|
/**
|
* rk_dma_heap_add - adds a heap to dmabuf heaps
|
* @exp_info: information needed to register this heap
|
*/
|
struct rk_dma_heap *rk_dma_heap_add(const struct rk_dma_heap_export_info *exp_info);
|
|
/**
|
* rk_dma_heap_put - drops a reference to a dmabuf heaps, potentially freeing it
|
* @heap: heap pointer
|
*/
|
void rk_dma_heap_put(struct rk_dma_heap *heap);
|
|
/**
|
* rk_vmap_contig_pfn - Map contiguous pfn to vm area
|
* @pfn: indicate the first pfn of contig
|
* @count: count of pfns
|
* @prot: for mapping
|
*/
|
void *rk_vmap_contig_pfn(unsigned long pfn, unsigned int count,
|
pgprot_t prot);
|
/**
|
* rk_dma_heap_total_inc - Increase total buffer size
|
* @heap: dma_heap to increase
|
* @len: length to increase
|
*/
|
void rk_dma_heap_total_inc(struct rk_dma_heap *heap, size_t len);
|
/**
|
* rk_dma_heap_total_dec - Decrease total buffer size
|
* @heap: dma_heap to decrease
|
* @len: length to decrease
|
*/
|
void rk_dma_heap_total_dec(struct rk_dma_heap *heap, size_t len);
|
/**
|
* rk_dma_heap_get_cma - get cma structure
|
*/
|
struct cma *rk_dma_heap_get_cma(void);
|
#endif /* _DMA_HEAPS_H */
|
