linux/drivers/misc/bcm-vk/bcm_vk_sg.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2018-2020 Broadcom.
 */
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/pgtable.h>
#include <linux/vmalloc.h>

#include <asm/page.h>
#include <asm/unaligned.h>

#include <uapi/linux/misc/bcm_vk.h>

#include "bcm_vk.h"
#include "bcm_vk_msg.h"
#include "bcm_vk_sg.h"

/*
 * Valkyrie has a hardware limitation of 16M transfer size.
 * So limit the SGL chunks to 16M.
 */
#define BCM_VK_MAX_SGL_CHUNK …

static int bcm_vk_dma_alloc(struct device *dev,
			    struct bcm_vk_dma *dma,
			    int dir,
			    struct _vk_data *vkdata);
static int bcm_vk_dma_free(struct device *dev, struct bcm_vk_dma *dma);

/* Uncomment to dump SGLIST */
/* #define BCM_VK_DUMP_SGLIST */

static int bcm_vk_dma_alloc(struct device *dev,
			    struct bcm_vk_dma *dma,
			    int direction,
			    struct _vk_data *vkdata)
{ … }

int bcm_vk_sg_alloc(struct device *dev,
		    struct bcm_vk_dma *dma,
		    int dir,
		    struct _vk_data *vkdata,
		    int num)
{ … }

static int bcm_vk_dma_free(struct device *dev, struct bcm_vk_dma *dma)
{ … }

int bcm_vk_sg_free(struct device *dev, struct bcm_vk_dma *dma, int num,
		   int *proc_cnt)
{ … }