mirror of https://gitee.com/openkylin/linux.git
143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
#ifndef _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
|
|
#define _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
|
|
/*
|
|
* Virtio PCI driver - APIs for common functionality for all device versions
|
|
*
|
|
* This module allows virtio devices to be used over a virtual PCI device.
|
|
* This can be used with QEMU based VMMs like KVM or Xen.
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Copyright Red Hat, Inc. 2014
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Rusty Russell <rusty@rustcorp.com.au>
|
|
* Michael S. Tsirkin <mst@redhat.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/virtio.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_ring.h>
|
|
#include <linux/virtio_pci.h>
|
|
#include <linux/virtio_pci_modern.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
struct virtio_pci_vq_info {
|
|
/* the actual virtqueue */
|
|
struct virtqueue *vq;
|
|
|
|
/* the list node for the virtqueues list */
|
|
struct list_head node;
|
|
|
|
/* MSI-X vector (or none) */
|
|
unsigned msix_vector;
|
|
};
|
|
|
|
/* Our device structure */
|
|
struct virtio_pci_device {
|
|
struct virtio_device vdev;
|
|
struct pci_dev *pci_dev;
|
|
struct virtio_pci_modern_device mdev;
|
|
|
|
/* In legacy mode, these two point to within ->legacy. */
|
|
/* Where to read and clear interrupt */
|
|
u8 __iomem *isr;
|
|
|
|
/* Legacy only field */
|
|
/* the IO mapping for the PCI config space */
|
|
void __iomem *ioaddr;
|
|
|
|
/* a list of queues so we can dispatch IRQs */
|
|
spinlock_t lock;
|
|
struct list_head virtqueues;
|
|
|
|
/* array of all queues for house-keeping */
|
|
struct virtio_pci_vq_info **vqs;
|
|
|
|
/* MSI-X support */
|
|
int msix_enabled;
|
|
int intx_enabled;
|
|
cpumask_var_t *msix_affinity_masks;
|
|
/* Name strings for interrupts. This size should be enough,
|
|
* and I'm too lazy to allocate each name separately. */
|
|
char (*msix_names)[256];
|
|
/* Number of available vectors */
|
|
unsigned msix_vectors;
|
|
/* Vectors allocated, excluding per-vq vectors if any */
|
|
unsigned msix_used_vectors;
|
|
|
|
/* Whether we have vector per vq */
|
|
bool per_vq_vectors;
|
|
|
|
struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
|
|
struct virtio_pci_vq_info *info,
|
|
unsigned idx,
|
|
void (*callback)(struct virtqueue *vq),
|
|
const char *name,
|
|
bool ctx,
|
|
u16 msix_vec);
|
|
void (*del_vq)(struct virtio_pci_vq_info *info);
|
|
|
|
u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
|
|
};
|
|
|
|
/* Constants for MSI-X */
|
|
/* Use first vector for configuration changes, second and the rest for
|
|
* virtqueues Thus, we need at least 2 vectors for MSI. */
|
|
enum {
|
|
VP_MSIX_CONFIG_VECTOR = 0,
|
|
VP_MSIX_VQ_VECTOR = 1,
|
|
};
|
|
|
|
/* Convert a generic virtio device to our structure */
|
|
static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
|
|
{
|
|
return container_of(vdev, struct virtio_pci_device, vdev);
|
|
}
|
|
|
|
/* wait for pending irq handlers */
|
|
void vp_synchronize_vectors(struct virtio_device *vdev);
|
|
/* the notify function used when creating a virt queue */
|
|
bool vp_notify(struct virtqueue *vq);
|
|
/* the config->del_vqs() implementation */
|
|
void vp_del_vqs(struct virtio_device *vdev);
|
|
/* the config->find_vqs() implementation */
|
|
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
struct virtqueue *vqs[], vq_callback_t *callbacks[],
|
|
const char * const names[], const bool *ctx,
|
|
struct irq_affinity *desc);
|
|
const char *vp_bus_name(struct virtio_device *vdev);
|
|
|
|
/* Setup the affinity for a virtqueue:
|
|
* - force the affinity for per vq vector
|
|
* - OR over all affinities for shared MSI
|
|
* - ignore the affinity request if we're using INTX
|
|
*/
|
|
int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask);
|
|
|
|
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
|
|
|
|
#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
|
|
int virtio_pci_legacy_probe(struct virtio_pci_device *);
|
|
void virtio_pci_legacy_remove(struct virtio_pci_device *);
|
|
#else
|
|
static inline int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
|
|
{
|
|
}
|
|
#endif
|
|
int virtio_pci_modern_probe(struct virtio_pci_device *);
|
|
void virtio_pci_modern_remove(struct virtio_pci_device *);
|
|
|
|
#endif
|