832 строки
22 KiB
C
832 строки
22 KiB
C
/*
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* Virtio PCI driver
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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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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.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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MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
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MODULE_DESCRIPTION("virtio-pci");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1");
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/* Our device structure */
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struct virtio_pci_device
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{
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struct virtio_device vdev;
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struct pci_dev *pci_dev;
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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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/* 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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/* Status saved during hibernate/restore */
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u8 saved_status;
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/* Whether we have vector per vq */
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bool per_vq_vectors;
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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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struct virtio_pci_vq_info
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{
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/* the actual virtqueue */
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struct virtqueue *vq;
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/* the number of entries in the queue */
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int num;
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/* the virtual address of the ring queue */
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void *queue;
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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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/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
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static DEFINE_PCI_DEVICE_TABLE(virtio_pci_id_table) = {
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{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
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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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/* virtio config->get_features() implementation */
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static u32 vp_get_features(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* When someone needs more than 32 feature bits, we'll need to
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* steal a bit to indicate that the rest are somewhere else. */
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return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
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}
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/* virtio config->finalize_features() implementation */
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static void vp_finalize_features(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* Give virtio_ring a chance to accept features. */
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vring_transport_features(vdev);
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/* We only support 32 feature bits. */
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BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
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iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
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}
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/* virtio config->get() implementation */
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static void vp_get(struct virtio_device *vdev, unsigned offset,
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void *buf, unsigned len)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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void __iomem *ioaddr = vp_dev->ioaddr +
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VIRTIO_PCI_CONFIG(vp_dev) + offset;
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u8 *ptr = buf;
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int i;
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for (i = 0; i < len; i++)
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ptr[i] = ioread8(ioaddr + i);
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}
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/* the config->set() implementation. it's symmetric to the config->get()
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* implementation */
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static void vp_set(struct virtio_device *vdev, unsigned offset,
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const void *buf, unsigned len)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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void __iomem *ioaddr = vp_dev->ioaddr +
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VIRTIO_PCI_CONFIG(vp_dev) + offset;
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const u8 *ptr = buf;
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int i;
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for (i = 0; i < len; i++)
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iowrite8(ptr[i], ioaddr + i);
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}
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/* config->{get,set}_status() implementations */
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static u8 vp_get_status(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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}
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static void vp_set_status(struct virtio_device *vdev, u8 status)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* We should never be setting status to 0. */
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BUG_ON(status == 0);
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iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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}
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/* wait for pending irq handlers */
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static void vp_synchronize_vectors(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i;
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if (vp_dev->intx_enabled)
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synchronize_irq(vp_dev->pci_dev->irq);
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for (i = 0; i < vp_dev->msix_vectors; ++i)
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synchronize_irq(vp_dev->msix_entries[i].vector);
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}
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static void vp_reset(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* 0 status means a reset. */
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iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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/* Flush out the status write, and flush in device writes,
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* including MSi-X interrupts, if any. */
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ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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/* Flush pending VQ/configuration callbacks. */
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vp_synchronize_vectors(vdev);
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}
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/* the notify function used when creating a virt queue */
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static void vp_notify(struct virtqueue *vq)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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/* we write the queue's selector into the notification register to
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* signal the other end */
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iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
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}
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/* Handle a configuration change: Tell driver if it wants to know. */
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static irqreturn_t vp_config_changed(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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struct virtio_driver *drv;
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drv = container_of(vp_dev->vdev.dev.driver,
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struct virtio_driver, driver);
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if (drv && drv->config_changed)
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drv->config_changed(&vp_dev->vdev);
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return IRQ_HANDLED;
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}
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/* Notify all virtqueues on an interrupt. */
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static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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struct virtio_pci_vq_info *info;
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irqreturn_t ret = IRQ_NONE;
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unsigned long flags;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_for_each_entry(info, &vp_dev->virtqueues, node) {
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if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
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ret = IRQ_HANDLED;
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}
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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return ret;
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}
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/* A small wrapper to also acknowledge the interrupt when it's handled.
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* I really need an EIO hook for the vring so I can ack the interrupt once we
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* know that we'll be handling the IRQ but before we invoke the callback since
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* the callback may notify the host which results in the host attempting to
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* raise an interrupt that we would then mask once we acknowledged the
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* interrupt. */
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static irqreturn_t vp_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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u8 isr;
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/* reading the ISR has the effect of also clearing it so it's very
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* important to save off the value. */
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isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
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/* It's definitely not us if the ISR was not high */
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if (!isr)
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return IRQ_NONE;
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/* Configuration change? Tell driver if it wants to know. */
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if (isr & VIRTIO_PCI_ISR_CONFIG)
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vp_config_changed(irq, opaque);
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return vp_vring_interrupt(irq, opaque);
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}
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static void vp_free_vectors(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i;
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if (vp_dev->intx_enabled) {
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free_irq(vp_dev->pci_dev->irq, vp_dev);
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vp_dev->intx_enabled = 0;
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}
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for (i = 0; i < vp_dev->msix_used_vectors; ++i)
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free_irq(vp_dev->msix_entries[i].vector, vp_dev);
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for (i = 0; i < vp_dev->msix_vectors; i++)
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if (vp_dev->msix_affinity_masks[i])
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free_cpumask_var(vp_dev->msix_affinity_masks[i]);
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if (vp_dev->msix_enabled) {
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/* Disable the vector used for configuration */
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iowrite16(VIRTIO_MSI_NO_VECTOR,
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vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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/* Flush the write out to device */
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ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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pci_disable_msix(vp_dev->pci_dev);
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vp_dev->msix_enabled = 0;
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vp_dev->msix_vectors = 0;
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}
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vp_dev->msix_used_vectors = 0;
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kfree(vp_dev->msix_names);
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vp_dev->msix_names = NULL;
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kfree(vp_dev->msix_entries);
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vp_dev->msix_entries = NULL;
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kfree(vp_dev->msix_affinity_masks);
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vp_dev->msix_affinity_masks = NULL;
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}
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static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
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bool per_vq_vectors)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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const char *name = dev_name(&vp_dev->vdev.dev);
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unsigned i, v;
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int err = -ENOMEM;
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vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
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GFP_KERNEL);
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if (!vp_dev->msix_entries)
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goto error;
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vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
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GFP_KERNEL);
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if (!vp_dev->msix_names)
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goto error;
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vp_dev->msix_affinity_masks
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= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
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GFP_KERNEL);
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if (!vp_dev->msix_affinity_masks)
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goto error;
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for (i = 0; i < nvectors; ++i)
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if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
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GFP_KERNEL))
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goto error;
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for (i = 0; i < nvectors; ++i)
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vp_dev->msix_entries[i].entry = i;
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/* pci_enable_msix returns positive if we can't get this many. */
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err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
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if (err > 0)
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err = -ENOSPC;
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if (err)
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goto error;
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vp_dev->msix_vectors = nvectors;
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vp_dev->msix_enabled = 1;
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/* Set the vector used for configuration */
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v = vp_dev->msix_used_vectors;
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snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
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"%s-config", name);
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err = request_irq(vp_dev->msix_entries[v].vector,
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vp_config_changed, 0, vp_dev->msix_names[v],
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vp_dev);
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if (err)
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goto error;
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++vp_dev->msix_used_vectors;
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iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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/* Verify we had enough resources to assign the vector */
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v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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if (v == VIRTIO_MSI_NO_VECTOR) {
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err = -EBUSY;
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goto error;
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}
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if (!per_vq_vectors) {
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/* Shared vector for all VQs */
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v = vp_dev->msix_used_vectors;
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snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
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"%s-virtqueues", name);
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err = request_irq(vp_dev->msix_entries[v].vector,
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vp_vring_interrupt, 0, vp_dev->msix_names[v],
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vp_dev);
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if (err)
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goto error;
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++vp_dev->msix_used_vectors;
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}
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return 0;
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error:
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vp_free_vectors(vdev);
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return err;
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}
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static int vp_request_intx(struct virtio_device *vdev)
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{
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int err;
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
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IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
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if (!err)
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vp_dev->intx_enabled = 1;
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return err;
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}
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static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
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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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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtio_pci_vq_info *info;
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struct virtqueue *vq;
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unsigned long flags, size;
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u16 num;
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int err;
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/* Select the queue we're interested in */
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iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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/* Check if queue is either not available or already active. */
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num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
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if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
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return ERR_PTR(-ENOENT);
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/* allocate and fill out our structure the represents an active
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* queue */
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info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL);
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if (!info)
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return ERR_PTR(-ENOMEM);
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info->num = num;
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info->msix_vector = msix_vec;
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size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
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info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
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if (info->queue == NULL) {
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err = -ENOMEM;
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goto out_info;
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}
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/* activate the queue */
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iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
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vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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/* create the vring */
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vq = vring_new_virtqueue(index, info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
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true, info->queue, vp_notify, callback, name);
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if (!vq) {
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err = -ENOMEM;
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goto out_activate_queue;
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}
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vq->priv = info;
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info->vq = vq;
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if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
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iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
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err = -EBUSY;
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goto out_assign;
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}
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}
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if (callback) {
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_add(&info->node, &vp_dev->virtqueues);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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} else {
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INIT_LIST_HEAD(&info->node);
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}
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return vq;
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out_assign:
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vring_del_virtqueue(vq);
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out_activate_queue:
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iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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free_pages_exact(info->queue, size);
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out_info:
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kfree(info);
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return ERR_PTR(err);
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}
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static void vp_del_vq(struct virtqueue *vq)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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struct virtio_pci_vq_info *info = vq->priv;
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unsigned long flags, size;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_del(&info->node);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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|
|
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
|
|
|
|
if (vp_dev->msix_enabled) {
|
|
iowrite16(VIRTIO_MSI_NO_VECTOR,
|
|
vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
|
|
/* Flush the write out to device */
|
|
ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
|
|
}
|
|
|
|
vring_del_virtqueue(vq);
|
|
|
|
/* Select and deactivate the queue */
|
|
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
|
|
|
|
size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
|
|
free_pages_exact(info->queue, size);
|
|
kfree(info);
|
|
}
|
|
|
|
/* the config->del_vqs() implementation */
|
|
static void vp_del_vqs(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
struct virtqueue *vq, *n;
|
|
struct virtio_pci_vq_info *info;
|
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
|
|
info = vq->priv;
|
|
if (vp_dev->per_vq_vectors &&
|
|
info->msix_vector != VIRTIO_MSI_NO_VECTOR)
|
|
free_irq(vp_dev->msix_entries[info->msix_vector].vector,
|
|
vq);
|
|
vp_del_vq(vq);
|
|
}
|
|
vp_dev->per_vq_vectors = false;
|
|
|
|
vp_free_vectors(vdev);
|
|
}
|
|
|
|
static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
struct virtqueue *vqs[],
|
|
vq_callback_t *callbacks[],
|
|
const char *names[],
|
|
bool use_msix,
|
|
bool per_vq_vectors)
|
|
{
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
u16 msix_vec;
|
|
int i, err, nvectors, allocated_vectors;
|
|
|
|
if (!use_msix) {
|
|
/* Old style: one normal interrupt for change and all vqs. */
|
|
err = vp_request_intx(vdev);
|
|
if (err)
|
|
goto error_request;
|
|
} else {
|
|
if (per_vq_vectors) {
|
|
/* Best option: one for change interrupt, one per vq. */
|
|
nvectors = 1;
|
|
for (i = 0; i < nvqs; ++i)
|
|
if (callbacks[i])
|
|
++nvectors;
|
|
} else {
|
|
/* Second best: one for change, shared for all vqs. */
|
|
nvectors = 2;
|
|
}
|
|
|
|
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
|
|
if (err)
|
|
goto error_request;
|
|
}
|
|
|
|
vp_dev->per_vq_vectors = per_vq_vectors;
|
|
allocated_vectors = vp_dev->msix_used_vectors;
|
|
for (i = 0; i < nvqs; ++i) {
|
|
if (!names[i]) {
|
|
vqs[i] = NULL;
|
|
continue;
|
|
} else if (!callbacks[i] || !vp_dev->msix_enabled)
|
|
msix_vec = VIRTIO_MSI_NO_VECTOR;
|
|
else if (vp_dev->per_vq_vectors)
|
|
msix_vec = allocated_vectors++;
|
|
else
|
|
msix_vec = VP_MSIX_VQ_VECTOR;
|
|
vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
|
|
if (IS_ERR(vqs[i])) {
|
|
err = PTR_ERR(vqs[i]);
|
|
goto error_find;
|
|
}
|
|
|
|
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
|
|
continue;
|
|
|
|
/* allocate per-vq irq if available and necessary */
|
|
snprintf(vp_dev->msix_names[msix_vec],
|
|
sizeof *vp_dev->msix_names,
|
|
"%s-%s",
|
|
dev_name(&vp_dev->vdev.dev), names[i]);
|
|
err = request_irq(vp_dev->msix_entries[msix_vec].vector,
|
|
vring_interrupt, 0,
|
|
vp_dev->msix_names[msix_vec],
|
|
vqs[i]);
|
|
if (err) {
|
|
vp_del_vq(vqs[i]);
|
|
goto error_find;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
error_find:
|
|
vp_del_vqs(vdev);
|
|
|
|
error_request:
|
|
return err;
|
|
}
|
|
|
|
/* the config->find_vqs() implementation */
|
|
static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
struct virtqueue *vqs[],
|
|
vq_callback_t *callbacks[],
|
|
const char *names[])
|
|
{
|
|
int err;
|
|
|
|
/* Try MSI-X with one vector per queue. */
|
|
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
|
|
if (!err)
|
|
return 0;
|
|
/* Fallback: MSI-X with one vector for config, one shared for queues. */
|
|
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
|
|
true, false);
|
|
if (!err)
|
|
return 0;
|
|
/* Finally fall back to regular interrupts. */
|
|
return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
|
|
false, false);
|
|
}
|
|
|
|
static const char *vp_bus_name(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
return pci_name(vp_dev->pci_dev);
|
|
}
|
|
|
|
/* 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
|
|
*/
|
|
static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
|
|
{
|
|
struct virtio_device *vdev = vq->vdev;
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
struct virtio_pci_vq_info *info = vq->priv;
|
|
struct cpumask *mask;
|
|
unsigned int irq;
|
|
|
|
if (!vq->callback)
|
|
return -EINVAL;
|
|
|
|
if (vp_dev->msix_enabled) {
|
|
mask = vp_dev->msix_affinity_masks[info->msix_vector];
|
|
irq = vp_dev->msix_entries[info->msix_vector].vector;
|
|
if (cpu == -1)
|
|
irq_set_affinity_hint(irq, NULL);
|
|
else {
|
|
cpumask_set_cpu(cpu, mask);
|
|
irq_set_affinity_hint(irq, mask);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct virtio_config_ops virtio_pci_config_ops = {
|
|
.get = vp_get,
|
|
.set = vp_set,
|
|
.get_status = vp_get_status,
|
|
.set_status = vp_set_status,
|
|
.reset = vp_reset,
|
|
.find_vqs = vp_find_vqs,
|
|
.del_vqs = vp_del_vqs,
|
|
.get_features = vp_get_features,
|
|
.finalize_features = vp_finalize_features,
|
|
.bus_name = vp_bus_name,
|
|
.set_vq_affinity = vp_set_vq_affinity,
|
|
};
|
|
|
|
static void virtio_pci_release_dev(struct device *_d)
|
|
{
|
|
/*
|
|
* No need for a release method as we allocate/free
|
|
* all devices together with the pci devices.
|
|
* Provide an empty one to avoid getting a warning from core.
|
|
*/
|
|
}
|
|
|
|
/* the PCI probing function */
|
|
static int virtio_pci_probe(struct pci_dev *pci_dev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
struct virtio_pci_device *vp_dev;
|
|
int err;
|
|
|
|
/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
|
|
if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
|
|
return -ENODEV;
|
|
|
|
if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
|
|
printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
|
|
VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* allocate our structure and fill it out */
|
|
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
|
|
if (vp_dev == NULL)
|
|
return -ENOMEM;
|
|
|
|
vp_dev->vdev.dev.parent = &pci_dev->dev;
|
|
vp_dev->vdev.dev.release = virtio_pci_release_dev;
|
|
vp_dev->vdev.config = &virtio_pci_config_ops;
|
|
vp_dev->pci_dev = pci_dev;
|
|
INIT_LIST_HEAD(&vp_dev->virtqueues);
|
|
spin_lock_init(&vp_dev->lock);
|
|
|
|
/* Disable MSI/MSIX to bring device to a known good state. */
|
|
pci_msi_off(pci_dev);
|
|
|
|
/* enable the device */
|
|
err = pci_enable_device(pci_dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = pci_request_regions(pci_dev, "virtio-pci");
|
|
if (err)
|
|
goto out_enable_device;
|
|
|
|
vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
|
|
if (vp_dev->ioaddr == NULL) {
|
|
err = -ENOMEM;
|
|
goto out_req_regions;
|
|
}
|
|
|
|
pci_set_drvdata(pci_dev, vp_dev);
|
|
pci_set_master(pci_dev);
|
|
|
|
/* we use the subsystem vendor/device id as the virtio vendor/device
|
|
* id. this allows us to use the same PCI vendor/device id for all
|
|
* virtio devices and to identify the particular virtio driver by
|
|
* the subsystem ids */
|
|
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
|
|
vp_dev->vdev.id.device = pci_dev->subsystem_device;
|
|
|
|
/* finally register the virtio device */
|
|
err = register_virtio_device(&vp_dev->vdev);
|
|
if (err)
|
|
goto out_set_drvdata;
|
|
|
|
return 0;
|
|
|
|
out_set_drvdata:
|
|
pci_set_drvdata(pci_dev, NULL);
|
|
pci_iounmap(pci_dev, vp_dev->ioaddr);
|
|
out_req_regions:
|
|
pci_release_regions(pci_dev);
|
|
out_enable_device:
|
|
pci_disable_device(pci_dev);
|
|
out:
|
|
kfree(vp_dev);
|
|
return err;
|
|
}
|
|
|
|
static void virtio_pci_remove(struct pci_dev *pci_dev)
|
|
{
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
|
|
unregister_virtio_device(&vp_dev->vdev);
|
|
|
|
vp_del_vqs(&vp_dev->vdev);
|
|
pci_set_drvdata(pci_dev, NULL);
|
|
pci_iounmap(pci_dev, vp_dev->ioaddr);
|
|
pci_release_regions(pci_dev);
|
|
pci_disable_device(pci_dev);
|
|
kfree(vp_dev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int virtio_pci_freeze(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
struct virtio_driver *drv;
|
|
int ret;
|
|
|
|
drv = container_of(vp_dev->vdev.dev.driver,
|
|
struct virtio_driver, driver);
|
|
|
|
ret = 0;
|
|
vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
|
|
if (drv && drv->freeze)
|
|
ret = drv->freeze(&vp_dev->vdev);
|
|
|
|
if (!ret)
|
|
pci_disable_device(pci_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int virtio_pci_restore(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
struct virtio_driver *drv;
|
|
int ret;
|
|
|
|
drv = container_of(vp_dev->vdev.dev.driver,
|
|
struct virtio_driver, driver);
|
|
|
|
ret = pci_enable_device(pci_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pci_set_master(pci_dev);
|
|
vp_finalize_features(&vp_dev->vdev);
|
|
|
|
if (drv && drv->restore)
|
|
ret = drv->restore(&vp_dev->vdev);
|
|
|
|
/* Finally, tell the device we're all set */
|
|
if (!ret)
|
|
vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct dev_pm_ops virtio_pci_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
|
|
};
|
|
#endif
|
|
|
|
static struct pci_driver virtio_pci_driver = {
|
|
.name = "virtio-pci",
|
|
.id_table = virtio_pci_id_table,
|
|
.probe = virtio_pci_probe,
|
|
.remove = virtio_pci_remove,
|
|
#ifdef CONFIG_PM
|
|
.driver.pm = &virtio_pci_pm_ops,
|
|
#endif
|
|
};
|
|
|
|
module_pci_driver(virtio_pci_driver);
|