linux/drivers/virtio/virtio_pci_admin_legacy_io.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
 */

#include <linux/virtio_pci_admin.h>
#include "virtio_pci_common.h"

/*
 * virtio_pci_admin_has_legacy_io - Checks whether the legacy IO
 * commands are supported
 * @dev: VF pci_dev
 *
 * Returns true on success.
 */
bool virtio_pci_admin_has_legacy_io(struct pci_dev *pdev)
{ … }
EXPORT_SYMBOL_GPL(…);

static int virtio_pci_admin_legacy_io_write(struct pci_dev *pdev, u16 opcode,
					    u8 offset, u8 size, u8 *buf)
{ … }

/*
 * virtio_pci_admin_legacy_io_write_common - Write legacy common configuration
 * of a member device
 * @dev: VF pci_dev
 * @offset: starting byte offset within the common configuration area to write to
 * @size: size of the data to write
 * @buf: buffer which holds the data
 *
 * Note: caller must serialize access for the given device.
 * Returns 0 on success, or negative on failure.
 */
int virtio_pci_admin_legacy_common_io_write(struct pci_dev *pdev, u8 offset,
					    u8 size, u8 *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * virtio_pci_admin_legacy_io_write_device - Write legacy device configuration
 * of a member device
 * @dev: VF pci_dev
 * @offset: starting byte offset within the device configuration area to write to
 * @size: size of the data to write
 * @buf: buffer which holds the data
 *
 * Note: caller must serialize access for the given device.
 * Returns 0 on success, or negative on failure.
 */
int virtio_pci_admin_legacy_device_io_write(struct pci_dev *pdev, u8 offset,
					    u8 size, u8 *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

static int virtio_pci_admin_legacy_io_read(struct pci_dev *pdev, u16 opcode,
					   u8 offset, u8 size, u8 *buf)
{ … }

/*
 * virtio_pci_admin_legacy_device_io_read - Read legacy device configuration of
 * a member device
 * @dev: VF pci_dev
 * @offset: starting byte offset within the device configuration area to read from
 * @size: size of the data to be read
 * @buf: buffer to hold the returned data
 *
 * Note: caller must serialize access for the given device.
 * Returns 0 on success, or negative on failure.
 */
int virtio_pci_admin_legacy_device_io_read(struct pci_dev *pdev, u8 offset,
					   u8 size, u8 *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * virtio_pci_admin_legacy_common_io_read - Read legacy common configuration of
 * a member device
 * @dev: VF pci_dev
 * @offset: starting byte offset within the common configuration area to read from
 * @size: size of the data to be read
 * @buf: buffer to hold the returned data
 *
 * Note: caller must serialize access for the given device.
 * Returns 0 on success, or negative on failure.
 */
int virtio_pci_admin_legacy_common_io_read(struct pci_dev *pdev, u8 offset,
					   u8 size, u8 *buf)
{ … }
EXPORT_SYMBOL_GPL(…);

/*
 * virtio_pci_admin_legacy_io_notify_info - Read the queue notification
 * information for legacy interface
 * @dev: VF pci_dev
 * @req_bar_flags: requested bar flags
 * @bar: on output the BAR number of the owner or member device
 * @bar_offset: on output the offset within bar
 *
 * Returns 0 on success, or negative on failure.
 */
int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev,
					   u8 req_bar_flags, u8 *bar,
					   u64 *bar_offset)
{ … }
EXPORT_SYMBOL_GPL(…);