2007-11-13 04:30:26 +01:00
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/*
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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/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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2008-03-29 04:09:48 +01:00
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void __iomem *ioaddr;
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2007-11-13 04:30:26 +01:00
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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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2009-05-14 12:55:41 +02:00
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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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/* 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 */
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unsigned msix_used_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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2007-11-13 04:30:26 +01:00
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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 index of the queue */
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int queue_index;
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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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2009-05-14 12:55:41 +02:00
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/* MSI-X vector (or none) */
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unsigned vector;
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2007-11-13 04:30:26 +01:00
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};
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/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
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static struct pci_device_id virtio_pci_id_table[] = {
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{ 0x1af4, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
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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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/* A PCI device has it's own struct device and so does a virtio device so
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* we create a place for the virtio devices to show up in sysfs. I think it
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* would make more sense for virtio to not insist on having it's own device. */
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2008-12-15 13:58:27 +01:00
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static struct device *virtio_pci_root;
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2007-11-13 04:30:26 +01:00
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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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2008-05-03 04:50:50 +02:00
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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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2008-07-25 19:06:07 +02:00
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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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2007-11-13 04:30:26 +01:00
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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2008-07-25 19:06:13 +02:00
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/* Give virtio_ring a chance to accept features. */
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vring_transport_features(vdev);
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2008-07-25 19:06:07 +02:00
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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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2007-11-13 04:30:26 +01:00
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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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2009-05-14 12:55:41 +02:00
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void __iomem *ioaddr = vp_dev->ioaddr +
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VIRTIO_PCI_CONFIG(vp_dev) + offset;
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2007-11-13 04:30:26 +01:00
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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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2009-05-14 12:55:41 +02:00
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void __iomem *ioaddr = vp_dev->ioaddr +
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VIRTIO_PCI_CONFIG(vp_dev) + offset;
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2007-11-13 04:30:26 +01:00
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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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2008-04-01 02:53:55 +02:00
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iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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2007-11-13 04:30:26 +01:00
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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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2008-04-01 02:53:55 +02:00
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iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
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2007-11-13 04:30:26 +01:00
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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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struct virtio_pci_vq_info *info = vq->priv;
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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(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
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}
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2009-05-14 12:55:31 +02:00
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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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2007-11-13 04:30:26 +01:00
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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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2009-05-14 12:55:31 +02:00
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if (isr & VIRTIO_PCI_ISR_CONFIG)
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vp_config_changed(irq, opaque);
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2007-11-13 04:30:26 +01:00
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2009-05-14 12:55:31 +02:00
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return vp_vring_interrupt(irq, opaque);
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2007-11-13 04:30:26 +01:00
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}
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2009-05-14 12:55:41 +02:00
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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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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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2009-07-23 13:57:37 +02:00
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vp_dev->msix_enabled = 0;
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vp_dev->msix_vectors = 0;
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2009-05-14 12:55:41 +02:00
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}
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2009-07-23 13:57:37 +02:00
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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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2009-05-14 12:55:41 +02:00
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}
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static int vp_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
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int *options, int noptions)
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{
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int i;
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for (i = 0; i < noptions; ++i)
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if (!pci_enable_msix(dev, entries, options[i]))
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return options[i];
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return -EBUSY;
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}
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static int vp_request_vectors(struct virtio_device *vdev, unsigned max_vqs)
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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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/* We want at most one vector per queue and one for config changes.
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* Fallback to separate vectors for config and a shared for queues.
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* Finally fall back to regular interrupts. */
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int options[] = { max_vqs + 1, 2 };
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int nvectors = max(options[0], options[1]);
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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)
|
2009-07-23 13:57:37 +02:00
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goto error;
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2009-05-14 12:55:41 +02:00
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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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2009-07-23 13:57:37 +02:00
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goto error;
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2009-05-14 12:55:41 +02:00
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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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err = vp_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries,
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options, ARRAY_SIZE(options));
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if (err < 0) {
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/* Can't allocate enough MSI-X vectors, use regular interrupt */
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vp_dev->msix_vectors = 0;
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err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
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IRQF_SHARED, name, vp_dev);
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if (err)
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2009-07-23 13:57:37 +02:00
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goto error;
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2009-05-14 12:55:41 +02:00
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vp_dev->intx_enabled = 1;
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} else {
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vp_dev->msix_vectors = err;
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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,
|
|
|
|
"%s-config", name);
|
|
|
|
err = request_irq(vp_dev->msix_entries[v].vector,
|
|
|
|
vp_config_changed, 0, vp_dev->msix_names[v],
|
|
|
|
vp_dev);
|
|
|
|
if (err)
|
2009-07-23 13:57:37 +02:00
|
|
|
goto error;
|
2009-05-14 12:55:41 +02:00
|
|
|
++vp_dev->msix_used_vectors;
|
|
|
|
|
|
|
|
iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
|
|
|
|
/* Verify we had enough resources to assign the vector */
|
|
|
|
v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
|
|
|
|
if (v == VIRTIO_MSI_NO_VECTOR) {
|
|
|
|
err = -EBUSY;
|
2009-07-23 13:57:37 +02:00
|
|
|
goto error;
|
2009-05-14 12:55:41 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (vp_dev->msix_vectors && vp_dev->msix_vectors != max_vqs + 1) {
|
|
|
|
/* Shared vector for all VQs */
|
|
|
|
v = vp_dev->msix_used_vectors;
|
|
|
|
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
|
|
|
|
"%s-virtqueues", name);
|
|
|
|
err = request_irq(vp_dev->msix_entries[v].vector,
|
|
|
|
vp_vring_interrupt, 0, vp_dev->msix_names[v],
|
|
|
|
vp_dev);
|
|
|
|
if (err)
|
2009-07-23 13:57:37 +02:00
|
|
|
goto error;
|
2009-05-14 12:55:41 +02:00
|
|
|
++vp_dev->msix_used_vectors;
|
|
|
|
}
|
|
|
|
return 0;
|
2009-07-23 13:57:37 +02:00
|
|
|
error:
|
2009-05-14 12:55:41 +02:00
|
|
|
vp_free_vectors(vdev);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2007-11-13 04:30:26 +01:00
|
|
|
static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
|
2009-06-13 06:16:35 +02:00
|
|
|
void (*callback)(struct virtqueue *vq),
|
|
|
|
const char *name)
|
2007-11-13 04:30:26 +01:00
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
struct virtio_pci_vq_info *info;
|
|
|
|
struct virtqueue *vq;
|
2008-12-02 23:24:40 +01:00
|
|
|
unsigned long flags, size;
|
2009-05-14 12:55:41 +02:00
|
|
|
u16 num, vector;
|
2007-11-13 04:30:26 +01:00
|
|
|
int err;
|
|
|
|
|
|
|
|
/* Select the queue we're interested in */
|
|
|
|
iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
|
|
|
|
|
|
|
|
/* Check if queue is either not available or already active. */
|
|
|
|
num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
|
|
|
|
if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
|
|
|
|
/* allocate and fill out our structure the represents an active
|
|
|
|
* queue */
|
|
|
|
info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL);
|
|
|
|
if (!info)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
info->queue_index = index;
|
|
|
|
info->num = num;
|
2009-05-14 12:55:41 +02:00
|
|
|
info->vector = VIRTIO_MSI_NO_VECTOR;
|
2007-11-13 04:30:26 +01:00
|
|
|
|
2008-12-30 16:25:57 +01:00
|
|
|
size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
|
2008-12-02 23:24:40 +01:00
|
|
|
info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
|
2007-11-13 04:30:26 +01:00
|
|
|
if (info->queue == NULL) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out_info;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* activate the queue */
|
2008-12-30 16:25:56 +01:00
|
|
|
iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
|
2007-11-13 04:30:26 +01:00
|
|
|
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
|
|
|
|
|
|
|
|
/* create the vring */
|
2008-12-30 16:26:03 +01:00
|
|
|
vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN,
|
2009-06-13 06:16:35 +02:00
|
|
|
vdev, info->queue, vp_notify, callback, name);
|
2007-11-13 04:30:26 +01:00
|
|
|
if (!vq) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out_activate_queue;
|
|
|
|
}
|
|
|
|
|
|
|
|
vq->priv = info;
|
|
|
|
info->vq = vq;
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
/* allocate per-vq vector if available and necessary */
|
|
|
|
if (callback && vp_dev->msix_used_vectors < vp_dev->msix_vectors) {
|
|
|
|
vector = vp_dev->msix_used_vectors;
|
|
|
|
snprintf(vp_dev->msix_names[vector], sizeof *vp_dev->msix_names,
|
|
|
|
"%s-%s", dev_name(&vp_dev->vdev.dev), name);
|
|
|
|
err = request_irq(vp_dev->msix_entries[vector].vector,
|
|
|
|
vring_interrupt, 0,
|
|
|
|
vp_dev->msix_names[vector], vq);
|
|
|
|
if (err)
|
|
|
|
goto out_request_irq;
|
|
|
|
info->vector = vector;
|
|
|
|
++vp_dev->msix_used_vectors;
|
|
|
|
} else
|
|
|
|
vector = VP_MSIX_VQ_VECTOR;
|
|
|
|
|
|
|
|
if (callback && vp_dev->msix_enabled) {
|
|
|
|
iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
|
|
|
|
vector = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
|
|
|
|
if (vector == VIRTIO_MSI_NO_VECTOR) {
|
|
|
|
err = -EBUSY;
|
|
|
|
goto out_assign;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-03-02 23:37:48 +01:00
|
|
|
spin_lock_irqsave(&vp_dev->lock, flags);
|
2007-11-13 04:30:26 +01:00
|
|
|
list_add(&info->node, &vp_dev->virtqueues);
|
2008-03-02 23:37:48 +01:00
|
|
|
spin_unlock_irqrestore(&vp_dev->lock, flags);
|
2007-11-13 04:30:26 +01:00
|
|
|
|
|
|
|
return vq;
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
out_assign:
|
|
|
|
if (info->vector != VIRTIO_MSI_NO_VECTOR) {
|
|
|
|
free_irq(vp_dev->msix_entries[info->vector].vector, vq);
|
|
|
|
--vp_dev->msix_used_vectors;
|
|
|
|
}
|
|
|
|
out_request_irq:
|
|
|
|
vring_del_virtqueue(vq);
|
2007-11-13 04:30:26 +01:00
|
|
|
out_activate_queue:
|
|
|
|
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
|
2008-12-02 23:24:40 +01:00
|
|
|
free_pages_exact(info->queue, size);
|
2007-11-13 04:30:26 +01:00
|
|
|
out_info:
|
|
|
|
kfree(info);
|
|
|
|
return ERR_PTR(err);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void vp_del_vq(struct virtqueue *vq)
|
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
|
|
|
|
struct virtio_pci_vq_info *info = vq->priv;
|
2009-06-13 06:16:36 +02:00
|
|
|
unsigned long size;
|
2007-11-13 04:30:26 +01:00
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
|
|
|
|
|
|
|
|
if (info->vector != VIRTIO_MSI_NO_VECTOR)
|
|
|
|
free_irq(vp_dev->msix_entries[info->vector].vector, vq);
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2007-11-13 04:30:26 +01:00
|
|
|
vring_del_virtqueue(vq);
|
|
|
|
|
|
|
|
/* Select and deactivate the queue */
|
|
|
|
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
|
|
|
|
|
2008-12-30 16:25:57 +01:00
|
|
|
size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
|
2008-12-02 23:24:40 +01:00
|
|
|
free_pages_exact(info->queue, size);
|
2007-11-13 04:30:26 +01:00
|
|
|
kfree(info);
|
|
|
|
}
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
/* the config->del_vqs() implementation */
|
2009-06-13 06:16:36 +02:00
|
|
|
static void vp_del_vqs(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct virtqueue *vq, *n;
|
|
|
|
|
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list)
|
|
|
|
vp_del_vq(vq);
|
2009-05-14 12:55:41 +02:00
|
|
|
|
|
|
|
vp_free_vectors(vdev);
|
2009-06-13 06:16:36 +02:00
|
|
|
}
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
/* the config->find_vqs() implementation */
|
2009-06-13 06:16:36 +02:00
|
|
|
static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
|
|
struct virtqueue *vqs[],
|
|
|
|
vq_callback_t *callbacks[],
|
|
|
|
const char *names[])
|
|
|
|
{
|
2009-05-14 12:55:41 +02:00
|
|
|
int vectors = 0;
|
|
|
|
int i, err;
|
|
|
|
|
|
|
|
/* How many vectors would we like? */
|
|
|
|
for (i = 0; i < nvqs; ++i)
|
|
|
|
if (callbacks[i])
|
|
|
|
++vectors;
|
|
|
|
|
|
|
|
err = vp_request_vectors(vdev, vectors);
|
|
|
|
if (err)
|
|
|
|
goto error_request;
|
2009-06-13 06:16:36 +02:00
|
|
|
|
|
|
|
for (i = 0; i < nvqs; ++i) {
|
|
|
|
vqs[i] = vp_find_vq(vdev, i, callbacks[i], names[i]);
|
|
|
|
if (IS_ERR(vqs[i]))
|
2009-05-14 12:55:41 +02:00
|
|
|
goto error_find;
|
2009-06-13 06:16:36 +02:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
error_find:
|
2009-06-13 06:16:36 +02:00
|
|
|
vp_del_vqs(vdev);
|
2009-05-14 12:55:41 +02:00
|
|
|
|
|
|
|
error_request:
|
2009-06-13 06:16:36 +02:00
|
|
|
return PTR_ERR(vqs[i]);
|
|
|
|
}
|
|
|
|
|
2007-11-13 04:30:26 +01:00
|
|
|
static 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,
|
2009-06-13 06:16:36 +02:00
|
|
|
.find_vqs = vp_find_vqs,
|
|
|
|
.del_vqs = vp_del_vqs,
|
2008-05-03 04:50:50 +02:00
|
|
|
.get_features = vp_get_features,
|
2008-07-25 19:06:07 +02:00
|
|
|
.finalize_features = vp_finalize_features,
|
2007-11-13 04:30:26 +01:00
|
|
|
};
|
|
|
|
|
2008-12-10 18:45:34 +01:00
|
|
|
static void virtio_pci_release_dev(struct device *_d)
|
|
|
|
{
|
|
|
|
struct virtio_device *dev = container_of(_d, struct virtio_device, dev);
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(dev);
|
|
|
|
struct pci_dev *pci_dev = vp_dev->pci_dev;
|
|
|
|
|
2009-05-14 12:55:41 +02:00
|
|
|
vp_del_vqs(dev);
|
2008-12-10 18:45:34 +01:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2007-11-13 04:30:26 +01:00
|
|
|
/* the PCI probing function */
|
|
|
|
static int __devinit 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;
|
|
|
|
|
2008-01-28 16:59:59 +01:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2007-11-13 04:30:26 +01:00
|
|
|
/* allocate our structure and fill it out */
|
|
|
|
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
|
|
|
|
if (vp_dev == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2008-12-15 13:58:27 +01:00
|
|
|
vp_dev->vdev.dev.parent = virtio_pci_root;
|
2008-12-10 18:45:34 +01:00
|
|
|
vp_dev->vdev.dev.release = virtio_pci_release_dev;
|
2007-11-13 04:30:26 +01:00
|
|
|
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);
|
|
|
|
|
|
|
|
/* 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)
|
|
|
|
goto out_req_regions;
|
|
|
|
|
|
|
|
pci_set_drvdata(pci_dev, vp_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 subsytem 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)
|
2009-05-14 12:55:41 +02:00
|
|
|
goto out_set_drvdata;
|
2007-11-13 04:30:26 +01:00
|
|
|
|
|
|
|
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 __devexit virtio_pci_remove(struct pci_dev *pci_dev)
|
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
|
|
|
2008-03-20 02:35:04 +01:00
|
|
|
unregister_virtio_device(&vp_dev->vdev);
|
2007-11-13 04:30:26 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int virtio_pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
|
|
|
|
{
|
|
|
|
pci_save_state(pci_dev);
|
|
|
|
pci_set_power_state(pci_dev, PCI_D3hot);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtio_pci_resume(struct pci_dev *pci_dev)
|
|
|
|
{
|
|
|
|
pci_restore_state(pci_dev);
|
|
|
|
pci_set_power_state(pci_dev, PCI_D0);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#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
|
|
|
|
.suspend = virtio_pci_suspend,
|
|
|
|
.resume = virtio_pci_resume,
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init virtio_pci_init(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
2008-12-15 13:58:27 +01:00
|
|
|
virtio_pci_root = root_device_register("virtio-pci");
|
|
|
|
if (IS_ERR(virtio_pci_root))
|
|
|
|
return PTR_ERR(virtio_pci_root);
|
2007-11-13 04:30:26 +01:00
|
|
|
|
|
|
|
err = pci_register_driver(&virtio_pci_driver);
|
|
|
|
if (err)
|
2009-07-07 09:26:45 +02:00
|
|
|
root_device_unregister(virtio_pci_root);
|
2007-11-13 04:30:26 +01:00
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(virtio_pci_init);
|
|
|
|
|
|
|
|
static void __exit virtio_pci_exit(void)
|
|
|
|
{
|
|
|
|
pci_unregister_driver(&virtio_pci_driver);
|
2008-12-15 13:58:27 +01:00
|
|
|
root_device_unregister(virtio_pci_root);
|
2007-11-13 04:30:26 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
module_exit(virtio_pci_exit);
|