linux/sound/pci/ctxfi/ctvmem.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
 *
 * @File    ctvmem.c
 *
 * @Brief
 * This file contains the implementation of virtual memory management object
 * for card device.
 *
 * @Author Liu Chun
 * @Date Apr 1 2008
 */

#include "ctvmem.h"
#include "ctatc.h"
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <sound/pcm.h>

#define CT_PTES_PER_PAGE …
#define CT_ADDRS_PER_PAGE …

/* *
 * Find or create vm block based on requested @size.
 * @size must be page aligned.
 * */
static struct ct_vm_block *
get_vm_block(struct ct_vm *vm, unsigned int size, struct ct_atc *atc)
{ … }

static void put_vm_block(struct ct_vm *vm, struct ct_vm_block *block)
{ … }

/* Map host addr (kmalloced/vmalloced) to device logical addr. */
static struct ct_vm_block *
ct_vm_map(struct ct_vm *vm, struct snd_pcm_substream *substream, int size)
{ … }

static void ct_vm_unmap(struct ct_vm *vm, struct ct_vm_block *block)
{ … }

/* *
 * return the host physical addr of the @index-th device
 * page table page on success, or ~0UL on failure.
 * The first returned ~0UL indicates the termination.
 * */
static dma_addr_t
ct_get_ptp_phys(struct ct_vm *vm, int index)
{ … }

int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci)
{ … }

/* The caller must ensure no mapping pages are being used
 * by hardware before calling this function */
void ct_vm_destroy(struct ct_vm *vm)
{ … }