2014-12-08 00:41:16 +08:00
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/*
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2014-12-08 18:31:02 +08:00
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* Virtio PCI driver - legacy device support
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2014-12-08 00:41:16 +08:00
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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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2014-12-08 18:31:02 +08:00
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* Copyright Red Hat, Inc. 2014
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2014-12-08 00:41:16 +08:00
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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2014-12-08 18:31:02 +08:00
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* Rusty Russell <rusty@rustcorp.com.au>
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* Michael S. Tsirkin <mst@redhat.com>
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2014-12-08 00:41:16 +08:00
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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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2014-12-08 22:39:45 +08:00
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#include "virtio_pci_common.h"
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2014-12-08 00:41:16 +08:00
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/* virtio config->get_features() implementation */
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static u64 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 int 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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/* Make sure we don't have any features > 32 bits! */
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BUG_ON((u32)vdev->features != vdev->features);
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/* We only support 32 feature bits. */
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iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
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return 0;
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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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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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static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
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{
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/* Setup the vector used for configuration events */
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iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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/* Verify we had enough resources to assign the vector */
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/* Will also flush the write out to device */
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return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
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}
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static 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 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 virtqueue *vq;
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unsigned long 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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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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return ERR_PTR(-ENOMEM);
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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,
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VIRTIO_PCI_VRING_ALIGN, &vp_dev->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 = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
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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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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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return ERR_PTR(err);
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}
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static void del_vq(struct virtio_pci_vq_info *info)
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{
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struct virtqueue *vq = info->vq;
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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unsigned long size;
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iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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if (vp_dev->msix_enabled) {
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iowrite16(VIRTIO_MSI_NO_VECTOR,
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vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
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/* Flush the write out to device */
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ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
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}
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vring_del_virtqueue(vq);
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/* Select and deactivate the queue */
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iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
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size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
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free_pages_exact(info->queue, size);
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}
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static const struct virtio_config_ops virtio_pci_config_ops = {
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.get = vp_get,
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.set = vp_set,
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.get_status = vp_get_status,
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.set_status = vp_set_status,
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.reset = vp_reset,
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.find_vqs = vp_find_vqs,
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.del_vqs = vp_del_vqs,
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.get_features = vp_get_features,
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.finalize_features = vp_finalize_features,
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.bus_name = vp_bus_name,
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.set_vq_affinity = vp_set_vq_affinity,
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};
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2015-01-04 19:25:30 +08:00
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static void virtio_pci_release_dev(struct device *_d)
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{
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/*
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* No need for a release method as we allocate/free
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* all devices together with the pci devices.
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* Provide an empty one to avoid getting a warning from core.
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*/
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}
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2014-12-08 00:41:16 +08:00
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/* the PCI probing function */
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2014-12-12 03:47:49 +08:00
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int virtio_pci_legacy_probe(struct pci_dev *pci_dev,
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2014-12-08 00:41:16 +08:00
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const struct pci_device_id *id)
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{
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struct virtio_pci_device *vp_dev;
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int err;
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/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
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if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
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return -ENODEV;
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if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
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printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
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VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
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return -ENODEV;
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}
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/* allocate our structure and fill it out */
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vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
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if (vp_dev == NULL)
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return -ENOMEM;
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vp_dev->vdev.dev.parent = &pci_dev->dev;
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vp_dev->vdev.dev.release = virtio_pci_release_dev;
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vp_dev->vdev.config = &virtio_pci_config_ops;
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vp_dev->pci_dev = pci_dev;
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INIT_LIST_HEAD(&vp_dev->virtqueues);
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spin_lock_init(&vp_dev->lock);
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/* Disable MSI/MSIX to bring device to a known good state. */
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pci_msi_off(pci_dev);
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/* enable the device */
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err = pci_enable_device(pci_dev);
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if (err)
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goto out;
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err = pci_request_regions(pci_dev, "virtio-pci");
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if (err)
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goto out_enable_device;
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vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
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if (vp_dev->ioaddr == NULL) {
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err = -ENOMEM;
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goto out_req_regions;
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}
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vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
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pci_set_drvdata(pci_dev, vp_dev);
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pci_set_master(pci_dev);
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/* we use the subsystem vendor/device id as the virtio vendor/device
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* id. this allows us to use the same PCI vendor/device id for all
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* virtio devices and to identify the particular virtio driver by
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* the subsystem ids */
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vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
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vp_dev->vdev.id.device = pci_dev->subsystem_device;
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vp_dev->config_vector = vp_config_vector;
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vp_dev->setup_vq = setup_vq;
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vp_dev->del_vq = del_vq;
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/* finally register the virtio device */
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err = register_virtio_device(&vp_dev->vdev);
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if (err)
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goto out_set_drvdata;
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return 0;
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out_set_drvdata:
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pci_iounmap(pci_dev, vp_dev->ioaddr);
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out_req_regions:
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pci_release_regions(pci_dev);
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out_enable_device:
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pci_disable_device(pci_dev);
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out:
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kfree(vp_dev);
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return err;
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}
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2014-12-12 03:47:49 +08:00
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void virtio_pci_legacy_remove(struct pci_dev *pci_dev)
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2014-12-08 00:41:16 +08:00
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{
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struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
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unregister_virtio_device(&vp_dev->vdev);
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vp_del_vqs(&vp_dev->vdev);
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pci_iounmap(pci_dev, vp_dev->ioaddr);
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pci_release_regions(pci_dev);
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pci_disable_device(pci_dev);
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kfree(vp_dev);
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}
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