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471 lines
12 KiB
471 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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 <[email protected]> |
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* Rusty Russell <[email protected]> |
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* Michael S. Tsirkin <[email protected]> |
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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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#define VIRTIO_RING_NO_LEGACY |
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#include "virtio_pci_common.h" |
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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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return vp_modern_get_features(&vp_dev->mdev); |
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} |
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static void vp_transport_features(struct virtio_device *vdev, u64 features) |
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{ |
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struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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struct pci_dev *pci_dev = vp_dev->pci_dev; |
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if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && |
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pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV)) |
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__virtio_set_bit(vdev, VIRTIO_F_SR_IOV); |
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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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u64 features = vdev->features; |
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/* Give virtio_ring a chance to accept features. */ |
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vring_transport_features(vdev); |
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/* Give virtio_pci a chance to accept features. */ |
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vp_transport_features(vdev, features); |
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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_modern_set_features(&vp_dev->mdev, vdev->features); |
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return 0; |
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} |
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/* virtio config->get() implementation */ |
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static void vp_get(struct virtio_device *vdev, unsigned offset, |
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void *buf, unsigned len) |
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{ |
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struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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void __iomem *device = mdev->device; |
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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 > mdev->device_len); |
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switch (len) { |
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case 1: |
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b = ioread8(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(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(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(device + offset)); |
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memcpy(buf, &l, sizeof l); |
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l = cpu_to_le32(ioread32(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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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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void __iomem *device = mdev->device; |
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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 > mdev->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, 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), 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), 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), device + offset); |
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memcpy(&l, buf + sizeof l, sizeof l); |
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iowrite32(le32_to_cpu(l), 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_modern_generation(&vp_dev->mdev); |
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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_modern_get_status(&vp_dev->mdev); |
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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_modern_set_status(&vp_dev->mdev, 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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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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/* 0 status means a reset. */ |
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vp_modern_set_status(mdev, 0); |
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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_modern_get_status(mdev)) |
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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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return vp_modern_config_vector(&vp_dev->mdev, vector); |
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} |
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static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, |
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struct virtio_pci_vq_info *info, |
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unsigned index, |
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void (*callback)(struct virtqueue *vq), |
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const char *name, |
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bool ctx, |
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u16 msix_vec) |
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{ |
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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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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_modern_get_num_queues(mdev)) |
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return ERR_PTR(-ENOENT); |
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/* Check if queue is either not available or already active. */ |
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num = vp_modern_get_queue_size(mdev, index); |
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if (!num || vp_modern_get_queue_enable(mdev, index)) |
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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_modern_get_queue_notify_off(mdev, index); |
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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_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq)); |
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vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq), |
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virtqueue_get_avail_addr(vq), |
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virtqueue_get_used_addr(vq)); |
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if (mdev->notify_base) { |
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/* offset should not wrap */ |
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if ((u64)off * mdev->notify_offset_multiplier + 2 |
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> mdev->notify_len) { |
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dev_warn(&mdev->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, mdev->notify_offset_multiplier, |
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index, mdev->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 *)mdev->notify_base + |
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off * mdev->notify_offset_multiplier; |
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} else { |
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vq->priv = (void __force *)vp_modern_map_capability(mdev, |
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mdev->notify_map_cap, 2, 2, |
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off * mdev->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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msix_vec = vp_modern_queue_vector(mdev, index, msix_vec); |
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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 (!mdev->notify_base) |
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pci_iounmap(mdev->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_modern_set_queue_enable(&vp_dev->mdev, vq->index, true); |
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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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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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if (vp_dev->msix_enabled) |
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vp_modern_queue_vector(mdev, vq->index, |
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VIRTIO_MSI_NO_VECTOR); |
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if (!mdev->notify_base) |
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pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv); |
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vring_del_virtqueue(vq); |
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} |
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static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id, |
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u8 *bar, u64 *offset, u64 *len) |
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{ |
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int pos; |
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for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0; |
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pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { |
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u8 type, cap_len, id; |
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u32 tmp32; |
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u64 res_offset, res_length; |
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pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
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cfg_type), &type); |
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if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG) |
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continue; |
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pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
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cap_len), &cap_len); |
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if (cap_len != sizeof(struct virtio_pci_cap64)) { |
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dev_err(&dev->dev, "%s: shm cap with bad size offset:" |
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" %d size: %d\n", __func__, pos, cap_len); |
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continue; |
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} |
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pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
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id), &id); |
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if (id != required_id) |
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continue; |
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/* Type, and ID match, looks good */ |
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pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
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bar), bar); |
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/* Read the lower 32bit of length and offset */ |
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pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, |
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offset), &tmp32); |
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res_offset = tmp32; |
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pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, |
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length), &tmp32); |
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res_length = tmp32; |
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/* and now the top half */ |
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pci_read_config_dword(dev, |
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pos + offsetof(struct virtio_pci_cap64, |
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offset_hi), &tmp32); |
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res_offset |= ((u64)tmp32) << 32; |
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pci_read_config_dword(dev, |
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pos + offsetof(struct virtio_pci_cap64, |
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length_hi), &tmp32); |
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res_length |= ((u64)tmp32) << 32; |
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*offset = res_offset; |
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*len = res_length; |
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return pos; |
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} |
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return 0; |
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} |
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static bool vp_get_shm_region(struct virtio_device *vdev, |
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struct virtio_shm_region *region, u8 id) |
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{ |
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struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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struct pci_dev *pci_dev = vp_dev->pci_dev; |
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u8 bar; |
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u64 offset, len; |
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phys_addr_t phys_addr; |
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size_t bar_len; |
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if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len)) |
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return false; |
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phys_addr = pci_resource_start(pci_dev, bar); |
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bar_len = pci_resource_len(pci_dev, bar); |
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if ((offset + len) < offset) { |
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dev_err(&pci_dev->dev, "%s: cap offset+len overflow detected\n", |
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__func__); |
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return false; |
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} |
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if (offset + len > bar_len) { |
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dev_err(&pci_dev->dev, "%s: bar shorter than cap offset+len\n", |
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__func__); |
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return false; |
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} |
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region->len = len; |
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region->addr = (u64) phys_addr + offset; |
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return true; |
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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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.get_shm_region = vp_get_shm_region, |
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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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.get_shm_region = vp_get_shm_region, |
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}; |
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/* the PCI probing function */ |
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int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) |
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{ |
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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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struct pci_dev *pci_dev = vp_dev->pci_dev; |
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int err; |
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mdev->pci_dev = pci_dev; |
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err = vp_modern_probe(mdev); |
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if (err) |
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return err; |
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if (mdev->device) |
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vp_dev->vdev.config = &virtio_pci_config_ops; |
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else |
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vp_dev->vdev.config = &virtio_pci_config_nodev_ops; |
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vp_dev->config_vector = vp_config_vector; |
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vp_dev->setup_vq = setup_vq; |
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vp_dev->del_vq = del_vq; |
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vp_dev->isr = mdev->isr; |
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vp_dev->vdev.id = mdev->id; |
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return 0; |
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} |
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void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) |
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{ |
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struct virtio_pci_modern_device *mdev = &vp_dev->mdev; |
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vp_modern_remove(mdev); |
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}
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