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![weiping zhang](/assets/img/avatar_default.png)
As mentioned at drivers/base/core.c: /* * NOTE: _Never_ directly free @dev after calling this function, even * if it returned an error! Always use put_device() to give up the * reference initialized in this function instead. */ so we don't free vp_dev until vp_dev->vdev.dev.release be called. Signed-off-by: weiping zhang <zhangweiping@didichuxing.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
606 lines
15 KiB
C
606 lines
15 KiB
C
/*
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* Virtio PCI driver - common functionality for all device versions
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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 "virtio_pci_common.h"
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static bool force_legacy = false;
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#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
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module_param(force_legacy, bool, 0444);
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MODULE_PARM_DESC(force_legacy,
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"Force legacy mode for transitional virtio 1 devices");
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#endif
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/* wait for pending irq handlers */
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void vp_synchronize_vectors(struct virtio_device *vdev)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i;
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if (vp_dev->intx_enabled)
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synchronize_irq(vp_dev->pci_dev->irq);
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for (i = 0; i < vp_dev->msix_vectors; ++i)
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synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));
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}
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/* the notify function used when creating a virt queue */
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bool vp_notify(struct virtqueue *vq)
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{
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/* we write the queue's selector into the notification register to
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* signal the other end */
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iowrite16(vq->index, (void __iomem *)vq->priv);
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return true;
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}
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/* Handle a configuration change: Tell driver if it wants to know. */
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static irqreturn_t vp_config_changed(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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virtio_config_changed(&vp_dev->vdev);
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return IRQ_HANDLED;
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}
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/* Notify all virtqueues on an interrupt. */
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static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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struct virtio_pci_vq_info *info;
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irqreturn_t ret = IRQ_NONE;
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unsigned long flags;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_for_each_entry(info, &vp_dev->virtqueues, node) {
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if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
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ret = IRQ_HANDLED;
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}
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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return ret;
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}
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/* A small wrapper to also acknowledge the interrupt when it's handled.
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* I really need an EIO hook for the vring so I can ack the interrupt once we
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* know that we'll be handling the IRQ but before we invoke the callback since
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* the callback may notify the host which results in the host attempting to
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* raise an interrupt that we would then mask once we acknowledged the
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* interrupt. */
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static irqreturn_t vp_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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u8 isr;
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/* reading the ISR has the effect of also clearing it so it's very
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* important to save off the value. */
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isr = ioread8(vp_dev->isr);
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/* It's definitely not us if the ISR was not high */
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if (!isr)
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return IRQ_NONE;
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/* Configuration change? Tell driver if it wants to know. */
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if (isr & VIRTIO_PCI_ISR_CONFIG)
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vp_config_changed(irq, opaque);
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return vp_vring_interrupt(irq, opaque);
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}
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static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
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bool per_vq_vectors, 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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const char *name = dev_name(&vp_dev->vdev.dev);
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unsigned flags = PCI_IRQ_MSIX;
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unsigned i, v;
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int err = -ENOMEM;
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vp_dev->msix_vectors = nvectors;
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vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
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GFP_KERNEL);
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if (!vp_dev->msix_names)
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goto error;
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vp_dev->msix_affinity_masks
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= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
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GFP_KERNEL);
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if (!vp_dev->msix_affinity_masks)
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goto error;
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for (i = 0; i < nvectors; ++i)
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if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
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GFP_KERNEL))
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goto error;
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if (desc) {
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flags |= PCI_IRQ_AFFINITY;
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desc->pre_vectors++; /* virtio config vector */
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}
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err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,
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nvectors, flags, desc);
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if (err < 0)
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goto error;
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vp_dev->msix_enabled = 1;
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/* Set the vector used for configuration */
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v = vp_dev->msix_used_vectors;
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snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
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"%s-config", name);
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err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
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vp_config_changed, 0, vp_dev->msix_names[v],
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vp_dev);
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if (err)
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goto error;
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++vp_dev->msix_used_vectors;
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v = vp_dev->config_vector(vp_dev, v);
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/* Verify we had enough resources to assign the vector */
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if (v == VIRTIO_MSI_NO_VECTOR) {
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err = -EBUSY;
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goto error;
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}
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if (!per_vq_vectors) {
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/* Shared vector for all VQs */
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v = vp_dev->msix_used_vectors;
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snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
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"%s-virtqueues", name);
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err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
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vp_vring_interrupt, 0, vp_dev->msix_names[v],
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vp_dev);
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if (err)
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goto error;
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++vp_dev->msix_used_vectors;
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}
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return 0;
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error:
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return err;
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}
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static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, 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_device *vp_dev = to_vp_device(vdev);
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struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
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struct virtqueue *vq;
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unsigned long flags;
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/* fill out our structure that represents an active queue */
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if (!info)
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return ERR_PTR(-ENOMEM);
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vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
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msix_vec);
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if (IS_ERR(vq))
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goto out_info;
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info->vq = vq;
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if (callback) {
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_add(&info->node, &vp_dev->virtqueues);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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} else {
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INIT_LIST_HEAD(&info->node);
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}
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vp_dev->vqs[index] = info;
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return vq;
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out_info:
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kfree(info);
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return vq;
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}
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static void vp_del_vq(struct virtqueue *vq)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
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unsigned long flags;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_del(&info->node);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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vp_dev->del_vq(info);
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kfree(info);
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}
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/* the config->del_vqs() implementation */
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void vp_del_vqs(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 virtqueue *vq, *n;
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int i;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
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if (vp_dev->per_vq_vectors) {
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int v = vp_dev->vqs[vq->index]->msix_vector;
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if (v != VIRTIO_MSI_NO_VECTOR) {
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int irq = pci_irq_vector(vp_dev->pci_dev, v);
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irq_set_affinity_hint(irq, NULL);
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free_irq(irq, vq);
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}
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}
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vp_del_vq(vq);
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}
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vp_dev->per_vq_vectors = false;
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if (vp_dev->intx_enabled) {
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free_irq(vp_dev->pci_dev->irq, vp_dev);
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vp_dev->intx_enabled = 0;
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}
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for (i = 0; i < vp_dev->msix_used_vectors; ++i)
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free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev);
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for (i = 0; i < vp_dev->msix_vectors; i++)
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if (vp_dev->msix_affinity_masks[i])
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free_cpumask_var(vp_dev->msix_affinity_masks[i]);
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if (vp_dev->msix_enabled) {
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/* Disable the vector used for configuration */
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vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
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pci_free_irq_vectors(vp_dev->pci_dev);
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vp_dev->msix_enabled = 0;
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}
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vp_dev->msix_vectors = 0;
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vp_dev->msix_used_vectors = 0;
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kfree(vp_dev->msix_names);
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vp_dev->msix_names = NULL;
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kfree(vp_dev->msix_affinity_masks);
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vp_dev->msix_affinity_masks = NULL;
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kfree(vp_dev->vqs);
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vp_dev->vqs = NULL;
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}
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static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[], bool per_vq_vectors,
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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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u16 msix_vec;
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int i, err, nvectors, allocated_vectors;
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vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
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if (!vp_dev->vqs)
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return -ENOMEM;
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if (per_vq_vectors) {
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/* Best option: one for change interrupt, one per vq. */
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nvectors = 1;
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for (i = 0; i < nvqs; ++i)
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if (callbacks[i])
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++nvectors;
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} else {
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/* Second best: one for change, shared for all vqs. */
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nvectors = 2;
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}
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err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors,
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per_vq_vectors ? desc : NULL);
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if (err)
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goto error_find;
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vp_dev->per_vq_vectors = per_vq_vectors;
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allocated_vectors = vp_dev->msix_used_vectors;
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for (i = 0; i < nvqs; ++i) {
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if (!names[i]) {
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vqs[i] = NULL;
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continue;
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}
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if (!callbacks[i])
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msix_vec = VIRTIO_MSI_NO_VECTOR;
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else if (vp_dev->per_vq_vectors)
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msix_vec = allocated_vectors++;
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else
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msix_vec = VP_MSIX_VQ_VECTOR;
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vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
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ctx ? ctx[i] : false,
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msix_vec);
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if (IS_ERR(vqs[i])) {
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err = PTR_ERR(vqs[i]);
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goto error_find;
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}
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if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
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continue;
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/* allocate per-vq irq if available and necessary */
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snprintf(vp_dev->msix_names[msix_vec],
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sizeof *vp_dev->msix_names,
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"%s-%s",
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dev_name(&vp_dev->vdev.dev), names[i]);
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err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
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vring_interrupt, 0,
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vp_dev->msix_names[msix_vec],
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vqs[i]);
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if (err)
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goto error_find;
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}
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return 0;
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error_find:
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vp_del_vqs(vdev);
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return err;
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}
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static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[], const bool *ctx)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i, err;
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vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
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if (!vp_dev->vqs)
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return -ENOMEM;
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err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
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dev_name(&vdev->dev), vp_dev);
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if (err)
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goto out_del_vqs;
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vp_dev->intx_enabled = 1;
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vp_dev->per_vq_vectors = false;
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for (i = 0; i < nvqs; ++i) {
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if (!names[i]) {
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vqs[i] = NULL;
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continue;
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}
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vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
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ctx ? ctx[i] : false,
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VIRTIO_MSI_NO_VECTOR);
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if (IS_ERR(vqs[i])) {
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err = PTR_ERR(vqs[i]);
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goto out_del_vqs;
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}
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}
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return 0;
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out_del_vqs:
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vp_del_vqs(vdev);
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return err;
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}
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/* the config->find_vqs() implementation */
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int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], 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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int err;
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/* Try MSI-X with one vector per queue. */
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err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
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if (!err)
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return 0;
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/* Fallback: MSI-X with one vector for config, one shared for queues. */
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err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
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if (!err)
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return 0;
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/* Finally fall back to regular interrupts. */
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return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
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}
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const char *vp_bus_name(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 pci_name(vp_dev->pci_dev);
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}
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/* Setup the affinity for a virtqueue:
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* - force the affinity for per vq vector
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* - OR over all affinities for shared MSI
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* - ignore the affinity request if we're using INTX
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*/
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int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
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{
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struct virtio_device *vdev = vq->vdev;
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
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struct cpumask *mask;
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unsigned int irq;
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if (!vq->callback)
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return -EINVAL;
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if (vp_dev->msix_enabled) {
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mask = vp_dev->msix_affinity_masks[info->msix_vector];
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irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
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if (cpu == -1)
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irq_set_affinity_hint(irq, NULL);
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else {
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cpumask_clear(mask);
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cpumask_set_cpu(cpu, mask);
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irq_set_affinity_hint(irq, mask);
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}
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}
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return 0;
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}
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const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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if (!vp_dev->per_vq_vectors ||
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vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR)
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return NULL;
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return pci_irq_get_affinity(vp_dev->pci_dev,
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vp_dev->vqs[index]->msix_vector);
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}
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#ifdef CONFIG_PM_SLEEP
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static int virtio_pci_freeze(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
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int ret;
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ret = virtio_device_freeze(&vp_dev->vdev);
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if (!ret)
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pci_disable_device(pci_dev);
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return ret;
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}
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static int virtio_pci_restore(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
int ret;
|
|
|
|
ret = pci_enable_device(pci_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pci_set_master(pci_dev);
|
|
return virtio_device_restore(&vp_dev->vdev);
|
|
}
|
|
|
|
static const struct dev_pm_ops virtio_pci_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
|
|
};
|
|
#endif
|
|
|
|
|
|
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
|
|
static const struct pci_device_id virtio_pci_id_table[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },
|
|
{ 0 }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
|
|
|
|
static void virtio_pci_release_dev(struct device *_d)
|
|
{
|
|
struct virtio_device *vdev = dev_to_virtio(_d);
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
/* As struct device is a kobject, it's not safe to
|
|
* free the memory (including the reference counter itself)
|
|
* until it's release callback. */
|
|
kfree(vp_dev);
|
|
}
|
|
|
|
static int virtio_pci_probe(struct pci_dev *pci_dev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
struct virtio_pci_device *vp_dev, *reg_dev = NULL;
|
|
int rc;
|
|
|
|
/* allocate our structure and fill it out */
|
|
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
|
|
if (!vp_dev)
|
|
return -ENOMEM;
|
|
|
|
pci_set_drvdata(pci_dev, vp_dev);
|
|
vp_dev->vdev.dev.parent = &pci_dev->dev;
|
|
vp_dev->vdev.dev.release = virtio_pci_release_dev;
|
|
vp_dev->pci_dev = pci_dev;
|
|
INIT_LIST_HEAD(&vp_dev->virtqueues);
|
|
spin_lock_init(&vp_dev->lock);
|
|
|
|
/* enable the device */
|
|
rc = pci_enable_device(pci_dev);
|
|
if (rc)
|
|
goto err_enable_device;
|
|
|
|
if (force_legacy) {
|
|
rc = virtio_pci_legacy_probe(vp_dev);
|
|
/* Also try modern mode if we can't map BAR0 (no IO space). */
|
|
if (rc == -ENODEV || rc == -ENOMEM)
|
|
rc = virtio_pci_modern_probe(vp_dev);
|
|
if (rc)
|
|
goto err_probe;
|
|
} else {
|
|
rc = virtio_pci_modern_probe(vp_dev);
|
|
if (rc == -ENODEV)
|
|
rc = virtio_pci_legacy_probe(vp_dev);
|
|
if (rc)
|
|
goto err_probe;
|
|
}
|
|
|
|
pci_set_master(pci_dev);
|
|
|
|
rc = register_virtio_device(&vp_dev->vdev);
|
|
reg_dev = vp_dev;
|
|
if (rc)
|
|
goto err_register;
|
|
|
|
return 0;
|
|
|
|
err_register:
|
|
if (vp_dev->ioaddr)
|
|
virtio_pci_legacy_remove(vp_dev);
|
|
else
|
|
virtio_pci_modern_remove(vp_dev);
|
|
err_probe:
|
|
pci_disable_device(pci_dev);
|
|
err_enable_device:
|
|
if (reg_dev)
|
|
put_device(&vp_dev->vdev.dev);
|
|
else
|
|
kfree(vp_dev);
|
|
return rc;
|
|
}
|
|
|
|
static void virtio_pci_remove(struct pci_dev *pci_dev)
|
|
{
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
struct device *dev = get_device(&vp_dev->vdev.dev);
|
|
|
|
unregister_virtio_device(&vp_dev->vdev);
|
|
|
|
if (vp_dev->ioaddr)
|
|
virtio_pci_legacy_remove(vp_dev);
|
|
else
|
|
virtio_pci_modern_remove(vp_dev);
|
|
|
|
pci_disable_device(pci_dev);
|
|
put_device(dev);
|
|
}
|
|
|
|
static struct pci_driver virtio_pci_driver = {
|
|
.name = "virtio-pci",
|
|
.id_table = virtio_pci_id_table,
|
|
.probe = virtio_pci_probe,
|
|
.remove = virtio_pci_remove,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.driver.pm = &virtio_pci_pm_ops,
|
|
#endif
|
|
};
|
|
|
|
module_pci_driver(virtio_pci_driver);
|
|
|
|
MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
|
|
MODULE_DESCRIPTION("virtio-pci");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION("1");
|