162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
#ifndef _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
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#define _DRIVERS_VIRTIO_VIRTIO_PCI_COMMON_H
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/*
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* Virtio PCI driver - APIs for common functionality for all device versions
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*
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* This module allows virtio devices to be used over a virtual PCI device.
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* This can be used with QEMU based VMMs like KVM or Xen.
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*
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* Copyright IBM Corp. 2007
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* Copyright Red Hat, Inc. 2014
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Rusty Russell <rusty@rustcorp.com.au>
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* Michael S. Tsirkin <mst@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/virtio.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ring.h>
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#include <linux/virtio_pci.h>
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#include <linux/highmem.h>
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#include <linux/spinlock.h>
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struct virtio_pci_vq_info {
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/* the actual virtqueue */
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struct virtqueue *vq;
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/* the list node for the virtqueues list */
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struct list_head node;
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/* MSI-X vector (or none) */
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unsigned msix_vector;
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};
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/* Our device structure */
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struct virtio_pci_device {
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struct virtio_device vdev;
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struct pci_dev *pci_dev;
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/* In legacy mode, these two point to within ->legacy. */
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/* Where to read and clear interrupt */
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u8 __iomem *isr;
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/* Modern only fields */
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/* The IO mapping for the PCI config space (non-legacy mode) */
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struct virtio_pci_common_cfg __iomem *common;
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/* Device-specific data (non-legacy mode) */
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void __iomem *device;
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/* Base of vq notifications (non-legacy mode). */
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void __iomem *notify_base;
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/* So we can sanity-check accesses. */
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size_t notify_len;
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size_t device_len;
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/* Capability for when we need to map notifications per-vq. */
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int notify_map_cap;
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/* Multiply queue_notify_off by this value. (non-legacy mode). */
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u32 notify_offset_multiplier;
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int modern_bars;
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/* Legacy only field */
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/* the IO mapping for the PCI config space */
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void __iomem *ioaddr;
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/* a list of queues so we can dispatch IRQs */
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spinlock_t lock;
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struct list_head virtqueues;
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/* array of all queues for house-keeping */
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struct virtio_pci_vq_info **vqs;
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/* MSI-X support */
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int msix_enabled;
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int intx_enabled;
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struct msix_entry *msix_entries;
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cpumask_var_t *msix_affinity_masks;
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/* Name strings for interrupts. This size should be enough,
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* and I'm too lazy to allocate each name separately. */
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char (*msix_names)[256];
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/* Number of available vectors */
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unsigned msix_vectors;
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/* Vectors allocated, excluding per-vq vectors if any */
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unsigned msix_used_vectors;
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/* Whether we have vector per vq */
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bool per_vq_vectors;
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struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
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struct virtio_pci_vq_info *info,
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unsigned idx,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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u16 msix_vec);
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void (*del_vq)(struct virtio_pci_vq_info *info);
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u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
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};
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/* Constants for MSI-X */
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/* Use first vector for configuration changes, second and the rest for
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* virtqueues Thus, we need at least 2 vectors for MSI. */
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enum {
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VP_MSIX_CONFIG_VECTOR = 0,
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VP_MSIX_VQ_VECTOR = 1,
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};
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/* Convert a generic virtio device to our structure */
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static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
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{
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return container_of(vdev, struct virtio_pci_device, vdev);
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}
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/* wait for pending irq handlers */
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void vp_synchronize_vectors(struct virtio_device *vdev);
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/* the notify function used when creating a virt queue */
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bool vp_notify(struct virtqueue *vq);
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/* the config->del_vqs() implementation */
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void vp_del_vqs(struct virtio_device *vdev);
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/* the config->find_vqs() implementation */
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int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char * const names[]);
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const char *vp_bus_name(struct virtio_device *vdev);
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/* Setup the affinity for a virtqueue:
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* - force the affinity for per vq vector
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* - OR over all affinities for shared MSI
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* - ignore the affinity request if we're using INTX
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*/
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int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
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#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
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int virtio_pci_legacy_probe(struct virtio_pci_device *);
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void virtio_pci_legacy_remove(struct virtio_pci_device *);
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#else
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static inline int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
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{
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return -ENODEV;
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}
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static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
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{
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}
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#endif
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int virtio_pci_modern_probe(struct virtio_pci_device *);
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void virtio_pci_modern_remove(struct virtio_pci_device *);
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#endif
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