linux/drivers/staging/media/ipu3/ipu3-dmamap.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Intel Corporation
 * Copyright 2018 Google LLC.
 *
 * Author: Tomasz Figa <[email protected]>
 * Author: Yong Zhi <[email protected]>
 */

#include <linux/vmalloc.h>

#include "ipu3.h"
#include "ipu3-css-pool.h"
#include "ipu3-mmu.h"
#include "ipu3-dmamap.h"

/*
 * Free a buffer allocated by imgu_dmamap_alloc_buffer()
 */
static void imgu_dmamap_free_buffer(struct page **pages,
				    size_t size)
{ … }

/*
 * Based on the implementation of __iommu_dma_alloc_pages()
 * defined in drivers/iommu/dma-iommu.c
 */
static struct page **imgu_dmamap_alloc_buffer(size_t size, gfp_t gfp)
{ … }

/**
 * imgu_dmamap_alloc - allocate and map a buffer into KVA
 * @imgu: struct device pointer
 * @map: struct to store mapping variables
 * @len: size required
 *
 * Returns:
 *  KVA on success
 *  %NULL on failure
 */
void *imgu_dmamap_alloc(struct imgu_device *imgu, struct imgu_css_map *map,
			size_t len)
{ … }

void imgu_dmamap_unmap(struct imgu_device *imgu, struct imgu_css_map *map)
{ … }

/*
 * Counterpart of imgu_dmamap_alloc
 */
void imgu_dmamap_free(struct imgu_device *imgu, struct imgu_css_map *map)
{ … }

int imgu_dmamap_map_sg(struct imgu_device *imgu, struct scatterlist *sglist,
		       int nents, struct imgu_css_map *map)
{ … }

int imgu_dmamap_init(struct imgu_device *imgu)
{ … }

void imgu_dmamap_exit(struct imgu_device *imgu)
{ … }