linux/drivers/vfio/pci/vfio_pci_igd.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * VFIO PCI Intel Graphics support
 *
 * Copyright (C) 2016 Red Hat, Inc.  All rights reserved.
 *	Author: Alex Williamson <[email protected]>
 *
 * Register a device specific region through which to provide read-only
 * access to the Intel IGD opregion.  The register defining the opregion
 * address is also virtualized to prevent user modification.
 */

#include <linux/io.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>

#include "vfio_pci_priv.h"

#define OPREGION_SIGNATURE …
#define OPREGION_SIZE …
#define OPREGION_PCI_ADDR …

#define OPREGION_RVDA …
#define OPREGION_RVDS …
#define OPREGION_VERSION …

struct igd_opregion_vbt { … };

/**
 * igd_opregion_shift_copy() - Copy OpRegion to user buffer and shift position.
 * @dst: User buffer ptr to copy to.
 * @off: Offset to user buffer ptr. Increased by bytes on return.
 * @src: Source buffer to copy from.
 * @pos: Increased by bytes on return.
 * @remaining: Decreased by bytes on return.
 * @bytes: Bytes to copy and adjust off, pos and remaining.
 *
 * Copy OpRegion to offset from specific source ptr and shift the offset.
 *
 * Return: 0 on success, -EFAULT otherwise.
 *
 */
static inline unsigned long igd_opregion_shift_copy(char __user *dst,
						    loff_t *off,
						    void *src,
						    loff_t *pos,
						    size_t *remaining,
						    size_t bytes)
{ … }

static ssize_t vfio_pci_igd_rw(struct vfio_pci_core_device *vdev,
			       char __user *buf, size_t count, loff_t *ppos,
			       bool iswrite)
{ … }

static void vfio_pci_igd_release(struct vfio_pci_core_device *vdev,
				 struct vfio_pci_region *region)
{ … }

static const struct vfio_pci_regops vfio_pci_igd_regops = …;

static int vfio_pci_igd_opregion_init(struct vfio_pci_core_device *vdev)
{ … }

static ssize_t vfio_pci_igd_cfg_rw(struct vfio_pci_core_device *vdev,
				   char __user *buf, size_t count, loff_t *ppos,
				   bool iswrite)
{ … }

static void vfio_pci_igd_cfg_release(struct vfio_pci_core_device *vdev,
				     struct vfio_pci_region *region)
{ … }

static const struct vfio_pci_regops vfio_pci_igd_cfg_regops = …;

static int vfio_pci_igd_cfg_init(struct vfio_pci_core_device *vdev)
{ … }

int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
{ … }