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![Jason Wang](/assets/img/avatar_default.png)
We can simply reuse vp_synchronize_vectors() for .synchronize_cbs(). Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Halil Pasic <pasic@linux.ibm.com> Cc: Cornelia Huck <cohuck@redhat.com> Cc: Vineeth Vijayan <vneethv@linux.ibm.com> Cc: Peter Oberparleiter <oberpar@linux.ibm.com> Cc: linux-s390@vger.kernel.org Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Message-Id: <20220527060120.20964-5-jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Virtio PCI driver - legacy 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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#include "linux/virtio_pci_legacy.h"
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#include "virtio_pci_common.h"
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/* virtio config->get_features() implementation */
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static u64 vp_get_features(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* When someone needs more than 32 feature bits, we'll need to
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* steal a bit to indicate that the rest are somewhere else. */
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return vp_legacy_get_features(&vp_dev->ldev);
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}
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/* virtio config->finalize_features() implementation */
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static int vp_finalize_features(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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/* Give virtio_ring a chance to accept features. */
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vring_transport_features(vdev);
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/* Make sure we don't have any features > 32 bits! */
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BUG_ON((u32)vdev->features != vdev->features);
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/* We only support 32 feature bits. */
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vp_legacy_set_features(&vp_dev->ldev, 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 int offset,
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void *buf, unsigned int len)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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void __iomem *ioaddr = vp_dev->ldev.ioaddr +
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VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
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offset;
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u8 *ptr = buf;
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int i;
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for (i = 0; i < len; i++)
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ptr[i] = ioread8(ioaddr + i);
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}
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/* the config->set() implementation. it's symmetric to the config->get()
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* implementation */
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static void vp_set(struct virtio_device *vdev, unsigned int offset,
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const void *buf, unsigned int len)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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void __iomem *ioaddr = vp_dev->ldev.ioaddr +
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VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
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offset;
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const u8 *ptr = buf;
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int i;
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for (i = 0; i < len; i++)
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iowrite8(ptr[i], ioaddr + i);
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}
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/* config->{get,set}_status() implementations */
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static u8 vp_get_status(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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return vp_legacy_get_status(&vp_dev->ldev);
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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_legacy_set_status(&vp_dev->ldev, 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_legacy_set_status(&vp_dev->ldev, 0);
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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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vp_legacy_get_status(&vp_dev->ldev);
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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_legacy_config_vector(&vp_dev->ldev, 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 int 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 virtqueue *vq;
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u16 num;
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int err;
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u64 q_pfn;
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/* Check if queue is either not available or already active. */
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num = vp_legacy_get_queue_size(&vp_dev->ldev, index);
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if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))
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return ERR_PTR(-ENOENT);
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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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VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
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true, false, 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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q_pfn = virtqueue_get_desc_addr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
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if (q_pfn >> 32) {
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dev_err(&vp_dev->pci_dev->dev,
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"platform bug: legacy virtio-pci must not be used with RAM above 0x%llxGB\n",
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0x1ULL << (32 + PAGE_SHIFT - 30));
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err = -E2BIG;
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goto out_del_vq;
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}
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/* activate the queue */
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vp_legacy_set_queue_address(&vp_dev->ldev, index, q_pfn);
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vq->priv = (void __force *)vp_dev->ldev.ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
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if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
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msix_vec = vp_legacy_queue_vector(&vp_dev->ldev, 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 out_deactivate;
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}
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}
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return vq;
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out_deactivate:
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vp_legacy_set_queue_address(&vp_dev->ldev, index, 0);
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out_del_vq:
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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 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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if (vp_dev->msix_enabled) {
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vp_legacy_queue_vector(&vp_dev->ldev, vq->index,
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VIRTIO_MSI_NO_VECTOR);
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/* Flush the write out to device */
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ioread8(vp_dev->ldev.ioaddr + VIRTIO_PCI_ISR);
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}
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/* Select and deactivate the queue */
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vp_legacy_set_queue_address(&vp_dev->ldev, vq->index, 0);
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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_ops = {
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.get = vp_get,
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.set = vp_set,
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.get_status = vp_get_status,
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.set_status = vp_set_status,
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.reset = vp_reset,
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.find_vqs = vp_find_vqs,
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.del_vqs = vp_del_vqs,
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.synchronize_cbs = vp_synchronize_vectors,
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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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/* the PCI probing function */
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int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
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{
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struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;
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struct pci_dev *pci_dev = vp_dev->pci_dev;
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int rc;
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ldev->pci_dev = pci_dev;
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rc = vp_legacy_probe(ldev);
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if (rc)
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return rc;
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vp_dev->isr = ldev->isr;
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vp_dev->vdev.id = ldev->id;
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vp_dev->vdev.config = &virtio_pci_config_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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return 0;
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}
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void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
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{
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struct virtio_pci_legacy_device *ldev = &vp_dev->ldev;
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vp_legacy_remove(ldev);
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}
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