virtio_pci: modern driver
Lightly tested against qemu. One thing *not* implemented here is separate mappings for descriptor/avail/used rings. That's nice to have, will be done later after we have core support. This also exposes the PCI layout to userspace, and adds macros for PCI layout offsets: QEMU wants it, so why not? Trust, but verify. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
Rusty Russell
parent
71d70c266c
commit
1fcf0512c9
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@ -1,5 +1,5 @@
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obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
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obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
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obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
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virtio_pci-y := virtio_pci_legacy.o virtio_pci_common.o
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virtio_pci-y := virtio_pci_modern.o virtio_pci_legacy.o virtio_pci_common.o
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obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
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@ -505,7 +505,9 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
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if (rc)
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goto err_request_regions;
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rc = virtio_pci_legacy_probe(vp_dev);
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rc = virtio_pci_modern_probe(vp_dev);
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if (rc == -ENODEV)
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rc = virtio_pci_legacy_probe(vp_dev);
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if (rc)
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goto err_probe;
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@ -518,7 +520,10 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
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return 0;
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err_register:
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virtio_pci_legacy_remove(vp_dev);
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if (vp_dev->ioaddr)
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virtio_pci_legacy_remove(vp_dev);
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else
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virtio_pci_modern_remove(vp_dev);
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err_probe:
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pci_release_regions(pci_dev);
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err_request_regions:
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@ -534,7 +539,10 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
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unregister_virtio_device(&vp_dev->vdev);
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virtio_pci_legacy_remove(pci_dev);
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if (vp_dev->ioaddr)
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virtio_pci_legacy_remove(vp_dev);
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else
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virtio_pci_modern_remove(vp_dev);
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pci_release_regions(pci_dev);
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pci_disable_device(pci_dev);
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@ -53,12 +53,29 @@ struct virtio_pci_device {
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struct virtio_device vdev;
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struct pci_dev *pci_dev;
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/* In legacy mode, these two point to within ->legacy. */
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/* Where to read and clear interrupt */
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u8 __iomem *isr;
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/* Modern only fields */
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/* The IO mapping for the PCI config space (non-legacy mode) */
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struct virtio_pci_common_cfg __iomem *common;
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/* Device-specific data (non-legacy mode) */
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void __iomem *device;
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/* So we can sanity-check accesses. */
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size_t device_len;
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/* Capability for when we need to map notifications per-vq. */
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int notify_map_cap;
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/* Multiply queue_notify_off by this value. (non-legacy mode). */
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u32 notify_offset_multiplier;
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/* Legacy only field */
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/* the IO mapping for the PCI config space */
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void __iomem *ioaddr;
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/* the IO mapping for ISR operation */
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void __iomem *isr;
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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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@ -129,5 +146,7 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
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int virtio_pci_legacy_probe(struct virtio_pci_device *);
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void virtio_pci_legacy_remove(struct virtio_pci_device *);
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int virtio_pci_modern_probe(struct virtio_pci_device *);
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void virtio_pci_modern_remove(struct virtio_pci_device *);
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#endif
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@ -0,0 +1,587 @@
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/*
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* Virtio PCI driver - modern (virtio 1.0) device support
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*
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* This module allows virtio devices to be used over a virtual PCI device.
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* This can be used with QEMU based VMMs like KVM or Xen.
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*
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* Copyright IBM Corp. 2007
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* Copyright Red Hat, Inc. 2014
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Rusty Russell <rusty@rustcorp.com.au>
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* Michael S. Tsirkin <mst@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#define VIRTIO_PCI_NO_LEGACY
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#include "virtio_pci_common.h"
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static void __iomem *map_capability(struct pci_dev *dev, int off,
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size_t minlen,
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u32 align,
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u32 start, u32 size,
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size_t *len)
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{
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u8 bar;
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u32 offset, length;
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void __iomem *p;
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pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap,
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bar),
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&bar);
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pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
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&offset);
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pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
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&length);
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if (length <= start) {
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dev_err(&dev->dev,
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"virtio_pci: bad capability len %u (>%u expected)\n",
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length, start);
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return NULL;
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}
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if (length - start < minlen) {
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dev_err(&dev->dev,
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"virtio_pci: bad capability len %u (>=%zu expected)\n",
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length, minlen);
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return NULL;
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}
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length -= start;
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if (start + offset < offset) {
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dev_err(&dev->dev,
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"virtio_pci: map wrap-around %u+%u\n",
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start, offset);
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return NULL;
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}
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offset += start;
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if (offset & (align - 1)) {
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dev_err(&dev->dev,
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"virtio_pci: offset %u not aligned to %u\n",
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offset, align);
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return NULL;
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}
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if (length > size)
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length = size;
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if (len)
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*len = length;
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if (minlen + offset < minlen ||
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minlen + offset > pci_resource_len(dev, bar)) {
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dev_err(&dev->dev,
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"virtio_pci: map virtio %zu@%u "
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"out of range on bar %i length %lu\n",
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minlen, offset,
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bar, (unsigned long)pci_resource_len(dev, bar));
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return NULL;
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}
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p = pci_iomap_range(dev, bar, offset, length);
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if (!p)
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dev_err(&dev->dev,
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"virtio_pci: unable to map virtio %u@%u on bar %i\n",
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length, offset, bar);
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return p;
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}
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static void iowrite64_twopart(u64 val, __le32 __iomem *lo, __le32 __iomem *hi)
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{
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iowrite32((u32)val, lo);
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iowrite32(val >> 32, hi);
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}
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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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u64 features;
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iowrite32(0, &vp_dev->common->device_feature_select);
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features = ioread32(&vp_dev->common->device_feature);
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iowrite32(1, &vp_dev->common->device_feature_select);
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features |= ((u64)ioread32(&vp_dev->common->device_feature) << 32);
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return 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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if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
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dev_err(&vdev->dev, "virtio: device uses modern interface "
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"but does not have VIRTIO_F_VERSION_1\n");
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return -EINVAL;
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}
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iowrite32(0, &vp_dev->common->guest_feature_select);
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iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
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iowrite32(1, &vp_dev->common->guest_feature_select);
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iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
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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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u8 b;
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__le16 w;
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__le32 l;
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BUG_ON(offset + len > vp_dev->device_len);
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switch (len) {
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case 1:
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b = ioread8(vp_dev->device + offset);
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memcpy(buf, &b, sizeof b);
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break;
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case 2:
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w = cpu_to_le16(ioread16(vp_dev->device + offset));
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memcpy(buf, &w, sizeof w);
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break;
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case 4:
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l = cpu_to_le32(ioread32(vp_dev->device + offset));
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memcpy(buf, &l, sizeof l);
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break;
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case 8:
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l = cpu_to_le32(ioread32(vp_dev->device + offset));
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memcpy(buf, &l, sizeof l);
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l = cpu_to_le32(ioread32(vp_dev->device + offset + sizeof l));
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memcpy(buf + sizeof l, &l, sizeof l);
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break;
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default:
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BUG();
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}
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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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u8 b;
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__le16 w;
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__le32 l;
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BUG_ON(offset + len > vp_dev->device_len);
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switch (len) {
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case 1:
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memcpy(&b, buf, sizeof b);
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iowrite8(b, vp_dev->device + offset);
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break;
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case 2:
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memcpy(&w, buf, sizeof w);
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iowrite16(le16_to_cpu(w), vp_dev->device + offset);
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break;
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case 4:
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memcpy(&l, buf, sizeof l);
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iowrite32(le32_to_cpu(l), vp_dev->device + offset);
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break;
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case 8:
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memcpy(&l, buf, sizeof l);
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iowrite32(le32_to_cpu(l), vp_dev->device + offset);
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memcpy(&l, buf + sizeof l, sizeof l);
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iowrite32(le32_to_cpu(l), vp_dev->device + offset + sizeof l);
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break;
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default:
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BUG();
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}
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}
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static u32 vp_generation(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->common->config_generation);
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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->common->device_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->common->device_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->common->device_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->common->device_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->common->msix_config);
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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->common->msix_config);
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}
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static size_t vring_pci_size(u16 num)
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{
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/* We only need a cacheline separation. */
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return PAGE_ALIGN(vring_size(num, SMP_CACHE_BYTES));
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}
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static void *alloc_virtqueue_pages(int *num)
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{
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void *pages;
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/* TODO: allocate each queue chunk individually */
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for (; *num && vring_pci_size(*num) > PAGE_SIZE; *num /= 2) {
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pages = alloc_pages_exact(vring_pci_size(*num),
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GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
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if (pages)
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return pages;
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}
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if (!*num)
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return NULL;
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/* Try to get a single page. You are my only hope! */
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return alloc_pages_exact(vring_pci_size(*num), GFP_KERNEL|__GFP_ZERO);
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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 virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
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struct virtqueue *vq;
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u16 num, off;
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int err;
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|
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if (index >= ioread16(&cfg->num_queues))
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return ERR_PTR(-ENOENT);
|
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|
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/* Select the queue we're interested in */
|
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iowrite16(index, &cfg->queue_select);
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|
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/* Check if queue is either not available or already active. */
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num = ioread16(&cfg->queue_size);
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if (!num || ioread8(&cfg->queue_enable))
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return ERR_PTR(-ENOENT);
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|
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if (num & (num - 1)) {
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dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
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return ERR_PTR(-EINVAL);
|
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}
|
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|
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/* get offset of notification word for this vq */
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off = ioread16(&cfg->queue_notify_off);
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info->num = num;
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info->msix_vector = msix_vec;
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|
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info->queue = alloc_virtqueue_pages(&info->num);
|
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if (info->queue == NULL)
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return ERR_PTR(-ENOMEM);
|
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|
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/* create the vring */
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vq = vring_new_virtqueue(index, info->num,
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SMP_CACHE_BYTES, &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 err_new_queue;
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}
|
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/* activate the queue */
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iowrite16(num, &cfg->queue_size);
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iowrite64_twopart(virt_to_phys(info->queue),
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&cfg->queue_desc_lo, &cfg->queue_desc_hi);
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iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)),
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&cfg->queue_avail_lo, &cfg->queue_avail_hi);
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iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)),
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&cfg->queue_used_lo, &cfg->queue_used_hi);
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vq->priv = (void __force *)map_capability(vp_dev->pci_dev,
|
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vp_dev->notify_map_cap, 2, 2,
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off * vp_dev->notify_offset_multiplier, 2,
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NULL);
|
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|
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if (!vq->priv) {
|
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err = -ENOMEM;
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goto err_map_notify;
|
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}
|
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|
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if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
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iowrite16(msix_vec, &cfg->queue_msix_vector);
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msix_vec = ioread16(&cfg->queue_msix_vector);
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if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
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err = -EBUSY;
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goto err_assign_vector;
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}
|
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}
|
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|
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return vq;
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|
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err_assign_vector:
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pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv);
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err_map_notify:
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vring_del_virtqueue(vq);
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err_new_queue:
|
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free_pages_exact(info->queue, vring_pci_size(info->num));
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return ERR_PTR(err);
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}
|
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|
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static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
|
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const char *names[])
|
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{
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
||||
struct virtqueue *vq;
|
||||
int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names);
|
||||
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* Select and activate all queues. Has to be done last: once we do
|
||||
* this, there's no way to go back except reset.
|
||||
*/
|
||||
list_for_each_entry(vq, &vdev->vqs, list) {
|
||||
iowrite16(vq->index, &vp_dev->common->queue_select);
|
||||
iowrite8(1, &vp_dev->common->queue_enable);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void del_vq(struct virtio_pci_vq_info *info)
|
||||
{
|
||||
struct virtqueue *vq = info->vq;
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
|
||||
|
||||
iowrite16(vq->index, &vp_dev->common->queue_select);
|
||||
|
||||
if (vp_dev->msix_enabled) {
|
||||
iowrite16(VIRTIO_MSI_NO_VECTOR,
|
||||
&vp_dev->common->queue_msix_vector);
|
||||
/* Flush the write out to device */
|
||||
ioread16(&vp_dev->common->queue_msix_vector);
|
||||
}
|
||||
|
||||
pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv);
|
||||
|
||||
vring_del_virtqueue(vq);
|
||||
|
||||
free_pages_exact(info->queue, vring_pci_size(info->num));
|
||||
}
|
||||
|
||||
static const struct virtio_config_ops virtio_pci_config_ops = {
|
||||
.get = vp_get,
|
||||
.set = vp_set,
|
||||
.generation = vp_generation,
|
||||
.get_status = vp_get_status,
|
||||
.set_status = vp_set_status,
|
||||
.reset = vp_reset,
|
||||
.find_vqs = vp_modern_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,
|
||||
};
|
||||
|
||||
/**
|
||||
* virtio_pci_find_capability - walk capabilities to find device info.
|
||||
* @dev: the pci device
|
||||
* @cfg_type: the VIRTIO_PCI_CAP_* value we seek
|
||||
* @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
|
||||
*
|
||||
* Returns offset of the capability, or 0.
|
||||
*/
|
||||
static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
|
||||
u32 ioresource_types)
|
||||
{
|
||||
int pos;
|
||||
|
||||
for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
|
||||
pos > 0;
|
||||
pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
|
||||
u8 type, bar;
|
||||
pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
|
||||
cfg_type),
|
||||
&type);
|
||||
pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
|
||||
bar),
|
||||
&bar);
|
||||
|
||||
/* Ignore structures with reserved BAR values */
|
||||
if (bar > 0x5)
|
||||
continue;
|
||||
|
||||
if (type == cfg_type) {
|
||||
if (pci_resource_len(dev, bar) &&
|
||||
pci_resource_flags(dev, bar) & ioresource_types)
|
||||
return pos;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void virtio_pci_release_dev(struct device *_d)
|
||||
{
|
||||
struct virtio_device *vdev = dev_to_virtio(_d);
|
||||
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
||||
|
||||
kfree(vp_dev);
|
||||
}
|
||||
|
||||
/* TODO: validate the ABI statically. */
|
||||
static inline void check_offsets(void)
|
||||
{
|
||||
}
|
||||
|
||||
/* the PCI probing function */
|
||||
int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
|
||||
{
|
||||
struct pci_dev *pci_dev = vp_dev->pci_dev;
|
||||
int err, common, isr, notify, device;
|
||||
u32 notify_length;
|
||||
|
||||
check_offsets();
|
||||
|
||||
/* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
|
||||
if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
|
||||
return -ENODEV;
|
||||
|
||||
if (pci_dev->device < 0x1040) {
|
||||
/* Transitional devices: use the PCI subsystem device id as
|
||||
* virtio device id, same as legacy driver always did.
|
||||
*/
|
||||
vp_dev->vdev.id.device = pci_dev->subsystem_device;
|
||||
} else {
|
||||
/* Modern devices: simply use PCI device id, but start from 0x1040. */
|
||||
vp_dev->vdev.id.device = pci_dev->device - 0x1040;
|
||||
}
|
||||
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
|
||||
|
||||
if (virtio_device_is_legacy_only(vp_dev->vdev.id))
|
||||
return -ENODEV;
|
||||
|
||||
/* check for a common config: if not, use legacy mode (bar 0). */
|
||||
common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
|
||||
IORESOURCE_IO | IORESOURCE_MEM);
|
||||
if (!common) {
|
||||
dev_info(&pci_dev->dev,
|
||||
"virtio_pci: leaving for legacy driver\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* If common is there, these should be too... */
|
||||
isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
|
||||
IORESOURCE_IO | IORESOURCE_MEM);
|
||||
notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
|
||||
IORESOURCE_IO | IORESOURCE_MEM);
|
||||
if (!isr || !notify) {
|
||||
dev_err(&pci_dev->dev,
|
||||
"virtio_pci: missing capabilities %i/%i/%i\n",
|
||||
common, isr, notify);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Device capability is only mandatory for devices that have
|
||||
* device-specific configuration.
|
||||
*/
|
||||
device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
|
||||
IORESOURCE_IO | IORESOURCE_MEM);
|
||||
|
||||
err = -EINVAL;
|
||||
vp_dev->common = map_capability(pci_dev, common,
|
||||
sizeof(struct virtio_pci_common_cfg), 4,
|
||||
0, sizeof(struct virtio_pci_common_cfg),
|
||||
NULL);
|
||||
if (!vp_dev->common)
|
||||
goto err_map_common;
|
||||
vp_dev->isr = map_capability(pci_dev, isr, sizeof(u8), 1,
|
||||
0, 1,
|
||||
NULL);
|
||||
if (!vp_dev->isr)
|
||||
goto err_map_isr;
|
||||
|
||||
/* Read notify_off_multiplier from config space. */
|
||||
pci_read_config_dword(pci_dev,
|
||||
notify + offsetof(struct virtio_pci_notify_cap,
|
||||
notify_off_multiplier),
|
||||
&vp_dev->notify_offset_multiplier);
|
||||
/* Read notify length from config space. */
|
||||
pci_read_config_dword(pci_dev,
|
||||
notify + offsetof(struct virtio_pci_notify_cap,
|
||||
cap.length),
|
||||
¬ify_length);
|
||||
|
||||
vp_dev->notify_map_cap = notify;
|
||||
|
||||
/* Again, we don't know how much we should map, but PAGE_SIZE
|
||||
* is more than enough for all existing devices.
|
||||
*/
|
||||
if (device) {
|
||||
vp_dev->device = map_capability(pci_dev, device, 0, 4,
|
||||
0, PAGE_SIZE,
|
||||
&vp_dev->device_len);
|
||||
if (!vp_dev->device)
|
||||
goto err_map_device;
|
||||
}
|
||||
|
||||
vp_dev->vdev.config = &virtio_pci_config_ops;
|
||||
|
||||
vp_dev->config_vector = vp_config_vector;
|
||||
vp_dev->setup_vq = setup_vq;
|
||||
vp_dev->del_vq = del_vq;
|
||||
|
||||
return 0;
|
||||
|
||||
err_map_device:
|
||||
pci_iounmap(pci_dev, vp_dev->isr);
|
||||
err_map_isr:
|
||||
pci_iounmap(pci_dev, vp_dev->common);
|
||||
err_map_common:
|
||||
return err;
|
||||
}
|
||||
|
||||
void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
|
||||
{
|
||||
struct pci_dev *pci_dev = vp_dev->pci_dev;
|
||||
|
||||
if (vp_dev->device)
|
||||
pci_iounmap(pci_dev, vp_dev->device);
|
||||
pci_iounmap(pci_dev, vp_dev->isr);
|
||||
pci_iounmap(pci_dev, vp_dev->common);
|
||||
}
|
||||
|
|
@ -117,10 +117,11 @@ struct virtio_pci_cap {
|
|||
__u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
|
||||
__u8 cap_next; /* Generic PCI field: next ptr. */
|
||||
__u8 cap_len; /* Generic PCI field: capability length */
|
||||
__u8 type_and_bar; /* Upper 3 bits: bar.
|
||||
* Lower 3 is VIRTIO_PCI_CAP_*_CFG. */
|
||||
__u8 cfg_type; /* Identifies the structure. */
|
||||
__u8 bar; /* Where to find it. */
|
||||
__u8 padding[3]; /* Pad to full dword. */
|
||||
__le32 offset; /* Offset within bar. */
|
||||
__le32 length; /* Length. */
|
||||
__le32 length; /* Length of the structure, in bytes. */
|
||||
};
|
||||
|
||||
#define VIRTIO_PCI_CAP_BAR_SHIFT 5
|
||||
|
|
|
|||
Loading…
Reference in New Issue