724 строки
21 KiB
C
724 строки
21 KiB
C
/*
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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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#include <linux/delay.h>
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#define VIRTIO_PCI_NO_LEGACY
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#include "virtio_pci_common.h"
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/*
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* Type-safe wrappers for io accesses.
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* Use these to enforce at compile time the following spec requirement:
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*
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* The driver MUST access each field using the “natural” access
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* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
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* for 16-bit fields and 8-bit accesses for 8-bit fields.
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*/
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static inline u8 vp_ioread8(u8 __iomem *addr)
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{
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return ioread8(addr);
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}
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static inline u16 vp_ioread16 (__le16 __iomem *addr)
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{
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return ioread16(addr);
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}
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static inline u32 vp_ioread32(__le32 __iomem *addr)
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{
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return ioread32(addr);
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}
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static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
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{
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iowrite8(value, addr);
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}
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static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
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{
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iowrite16(value, addr);
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}
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static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
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{
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iowrite32(value, addr);
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}
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static void vp_iowrite64_twopart(u64 val,
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__le32 __iomem *lo, __le32 __iomem *hi)
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{
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vp_iowrite32((u32)val, lo);
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vp_iowrite32(val >> 32, hi);
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}
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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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/* 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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vp_iowrite32(0, &vp_dev->common->device_feature_select);
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features = vp_ioread32(&vp_dev->common->device_feature);
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vp_iowrite32(1, &vp_dev->common->device_feature_select);
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features |= ((u64)vp_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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vp_iowrite32(0, &vp_dev->common->guest_feature_select);
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vp_iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
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vp_iowrite32(1, &vp_dev->common->guest_feature_select);
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vp_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 vp_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 vp_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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vp_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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vp_iowrite8(0, &vp_dev->common->device_status);
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/* After writing 0 to device_status, the driver MUST wait for a read of
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* device_status to return 0 before reinitializing the device.
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* This will flush out the status write, and flush in device writes,
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* including MSI-X interrupts, if any.
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*/
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while (vp_ioread8(&vp_dev->common->device_status))
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msleep(1);
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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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vp_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 vp_ioread16(&vp_dev->common->msix_config);
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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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bool ctx,
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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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if (index >= vp_ioread16(&cfg->num_queues))
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return ERR_PTR(-ENOENT);
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/* Select the queue we're interested in */
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vp_iowrite16(index, &cfg->queue_select);
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/* Check if queue is either not available or already active. */
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num = vp_ioread16(&cfg->queue_size);
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if (!num || vp_ioread16(&cfg->queue_enable))
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return ERR_PTR(-ENOENT);
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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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/* get offset of notification word for this vq */
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off = vp_ioread16(&cfg->queue_notify_off);
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info->msix_vector = msix_vec;
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/* create the vring */
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vq = vring_create_virtqueue(index, num,
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SMP_CACHE_BYTES, &vp_dev->vdev,
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true, true, ctx,
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vp_notify, callback, name);
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if (!vq)
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return ERR_PTR(-ENOMEM);
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/* activate the queue */
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vp_iowrite16(virtqueue_get_vring_size(vq), &cfg->queue_size);
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vp_iowrite64_twopart(virtqueue_get_desc_addr(vq),
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&cfg->queue_desc_lo, &cfg->queue_desc_hi);
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vp_iowrite64_twopart(virtqueue_get_avail_addr(vq),
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&cfg->queue_avail_lo, &cfg->queue_avail_hi);
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vp_iowrite64_twopart(virtqueue_get_used_addr(vq),
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&cfg->queue_used_lo, &cfg->queue_used_hi);
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if (vp_dev->notify_base) {
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/* offset should not wrap */
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if ((u64)off * vp_dev->notify_offset_multiplier + 2
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> vp_dev->notify_len) {
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dev_warn(&vp_dev->pci_dev->dev,
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"bad notification offset %u (x %u) "
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"for queue %u > %zd",
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off, vp_dev->notify_offset_multiplier,
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index, vp_dev->notify_len);
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err = -EINVAL;
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goto err_map_notify;
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}
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vq->priv = (void __force *)vp_dev->notify_base +
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off * vp_dev->notify_offset_multiplier;
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} else {
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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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if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
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vp_iowrite16(msix_vec, &cfg->queue_msix_vector);
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msix_vec = vp_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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return vq;
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err_assign_vector:
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if (!vp_dev->notify_base)
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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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return ERR_PTR(err);
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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 * const names[], const bool *ctx,
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struct irq_affinity *desc)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtqueue *vq;
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int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);
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if (rc)
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return rc;
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/* Select and activate all queues. Has to be done last: once we do
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* this, there's no way to go back except reset.
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*/
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list_for_each_entry(vq, &vdev->vqs, list) {
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vp_iowrite16(vq->index, &vp_dev->common->queue_select);
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vp_iowrite16(1, &vp_dev->common->queue_enable);
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}
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return 0;
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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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vp_iowrite16(vq->index, &vp_dev->common->queue_select);
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if (vp_dev->msix_enabled) {
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vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
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&vp_dev->common->queue_msix_vector);
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/* Flush the write out to device */
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vp_ioread16(&vp_dev->common->queue_msix_vector);
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}
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if (!vp_dev->notify_base)
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pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv);
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vring_del_virtqueue(vq);
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}
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static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
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.get = NULL,
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.set = NULL,
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.generation = vp_generation,
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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_modern_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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.get_vq_affinity = vp_get_vq_affinity,
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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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.generation = vp_generation,
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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_modern_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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.get_vq_affinity = vp_get_vq_affinity,
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};
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/**
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* virtio_pci_find_capability - walk capabilities to find device info.
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* @dev: the pci device
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* @cfg_type: the VIRTIO_PCI_CAP_* value we seek
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* @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
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*
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* Returns offset of the capability, or 0.
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*/
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static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
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u32 ioresource_types, int *bars)
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{
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int pos;
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for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
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pos > 0;
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pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
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u8 type, bar;
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pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
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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) {
|
|
*bars |= (1 << bar);
|
|
return pos;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* This is part of the ABI. Don't screw with it. */
|
|
static inline void check_offsets(void)
|
|
{
|
|
/* Note: disk space was harmed in compilation of this function. */
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR !=
|
|
offsetof(struct virtio_pci_cap, cap_vndr));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT !=
|
|
offsetof(struct virtio_pci_cap, cap_next));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN !=
|
|
offsetof(struct virtio_pci_cap, cap_len));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE !=
|
|
offsetof(struct virtio_pci_cap, cfg_type));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR !=
|
|
offsetof(struct virtio_pci_cap, bar));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET !=
|
|
offsetof(struct virtio_pci_cap, offset));
|
|
BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH !=
|
|
offsetof(struct virtio_pci_cap, length));
|
|
BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT !=
|
|
offsetof(struct virtio_pci_notify_cap,
|
|
notify_off_multiplier));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT !=
|
|
offsetof(struct virtio_pci_common_cfg,
|
|
device_feature_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF !=
|
|
offsetof(struct virtio_pci_common_cfg, device_feature));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT !=
|
|
offsetof(struct virtio_pci_common_cfg,
|
|
guest_feature_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF !=
|
|
offsetof(struct virtio_pci_common_cfg, guest_feature));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX !=
|
|
offsetof(struct virtio_pci_common_cfg, msix_config));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ !=
|
|
offsetof(struct virtio_pci_common_cfg, num_queues));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS !=
|
|
offsetof(struct virtio_pci_common_cfg, device_status));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION !=
|
|
offsetof(struct virtio_pci_common_cfg, config_generation));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_select));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_size));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_msix_vector));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_enable));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_notify_off));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_desc_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_desc_hi));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_avail_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_avail_hi));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_used_lo));
|
|
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
|
|
offsetof(struct virtio_pci_common_cfg, queue_used_hi));
|
|
}
|
|
|
|
/* 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;
|
|
u32 notify_offset;
|
|
|
|
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;
|
|
|
|
/* 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,
|
|
&vp_dev->modern_bars);
|
|
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,
|
|
&vp_dev->modern_bars);
|
|
notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
|
|
IORESOURCE_IO | IORESOURCE_MEM,
|
|
&vp_dev->modern_bars);
|
|
if (!isr || !notify) {
|
|
dev_err(&pci_dev->dev,
|
|
"virtio_pci: missing capabilities %i/%i/%i\n",
|
|
common, isr, notify);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
|
|
if (err)
|
|
err = dma_set_mask_and_coherent(&pci_dev->dev,
|
|
DMA_BIT_MASK(32));
|
|
if (err)
|
|
dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
|
|
|
|
/* 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,
|
|
&vp_dev->modern_bars);
|
|
|
|
err = pci_request_selected_regions(pci_dev, vp_dev->modern_bars,
|
|
"virtio-pci-modern");
|
|
if (err)
|
|
return err;
|
|
|
|
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 and offset from config space. */
|
|
pci_read_config_dword(pci_dev,
|
|
notify + offsetof(struct virtio_pci_notify_cap,
|
|
cap.length),
|
|
¬ify_length);
|
|
|
|
pci_read_config_dword(pci_dev,
|
|
notify + offsetof(struct virtio_pci_notify_cap,
|
|
cap.offset),
|
|
¬ify_offset);
|
|
|
|
/* We don't know how many VQs we'll map, ahead of the time.
|
|
* If notify length is small, map it all now.
|
|
* Otherwise, map each VQ individually later.
|
|
*/
|
|
if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
|
|
vp_dev->notify_base = map_capability(pci_dev, notify, 2, 2,
|
|
0, notify_length,
|
|
&vp_dev->notify_len);
|
|
if (!vp_dev->notify_base)
|
|
goto err_map_notify;
|
|
} else {
|
|
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;
|
|
} else {
|
|
vp_dev->vdev.config = &virtio_pci_config_nodev_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:
|
|
if (vp_dev->notify_base)
|
|
pci_iounmap(pci_dev, vp_dev->notify_base);
|
|
err_map_notify:
|
|
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);
|
|
if (vp_dev->notify_base)
|
|
pci_iounmap(pci_dev, vp_dev->notify_base);
|
|
pci_iounmap(pci_dev, vp_dev->isr);
|
|
pci_iounmap(pci_dev, vp_dev->common);
|
|
pci_release_selected_regions(pci_dev, vp_dev->modern_bars);
|
|
}
|