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642 lines
16 KiB
642 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[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 "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_array(nvectors, |
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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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= kcalloc(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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if (vp_dev->msix_affinity_masks) { |
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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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} |
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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, queue_idx = 0; |
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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 (names[i] && 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, queue_idx++, 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, queue_idx = 0; |
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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, queue_idx++, 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, const struct cpumask *cpu_mask) |
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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_mask) |
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irq_set_affinity_hint(irq, NULL); |
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else { |
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cpumask_copy(mask, 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) |
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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 = pci_enable_device(pci_dev); |
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if (ret) |
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return ret; |
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pci_set_master(pci_dev); |
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return virtio_device_restore(&vp_dev->vdev); |
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} |
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static const struct dev_pm_ops virtio_pci_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) |
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}; |
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#endif |
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/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ |
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static const struct pci_device_id virtio_pci_id_table[] = { |
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{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, |
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{ 0 } |
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}; |
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MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); |
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static void virtio_pci_release_dev(struct device *_d) |
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{ |
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struct virtio_device *vdev = dev_to_virtio(_d); |
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struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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|
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/* As struct device is a kobject, it's not safe to |
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* free the memory (including the reference counter itself) |
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* until it's release callback. */ |
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kfree(vp_dev); |
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} |
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static int virtio_pci_probe(struct pci_dev *pci_dev, |
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const struct pci_device_id *id) |
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{ |
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struct virtio_pci_device *vp_dev, *reg_dev = NULL; |
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int rc; |
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|
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/* allocate our structure and fill it out */ |
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vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); |
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if (!vp_dev) |
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return -ENOMEM; |
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pci_set_drvdata(pci_dev, vp_dev); |
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vp_dev->vdev.dev.parent = &pci_dev->dev; |
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vp_dev->vdev.dev.release = virtio_pci_release_dev; |
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vp_dev->pci_dev = pci_dev; |
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INIT_LIST_HEAD(&vp_dev->virtqueues); |
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spin_lock_init(&vp_dev->lock); |
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|
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/* enable the device */ |
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rc = pci_enable_device(pci_dev); |
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if (rc) |
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goto err_enable_device; |
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|
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if (force_legacy) { |
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rc = virtio_pci_legacy_probe(vp_dev); |
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/* 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); |
|
|
|
/* |
|
* Device is marked broken on surprise removal so that virtio upper |
|
* layers can abort any ongoing operation. |
|
*/ |
|
if (!pci_device_is_present(pci_dev)) |
|
virtio_break_device(&vp_dev->vdev); |
|
|
|
pci_disable_sriov(pci_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 int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) |
|
{ |
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); |
|
struct virtio_device *vdev = &vp_dev->vdev; |
|
int ret; |
|
|
|
if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) |
|
return -EBUSY; |
|
|
|
if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) |
|
return -EINVAL; |
|
|
|
if (pci_vfs_assigned(pci_dev)) |
|
return -EPERM; |
|
|
|
if (num_vfs == 0) { |
|
pci_disable_sriov(pci_dev); |
|
return 0; |
|
} |
|
|
|
ret = pci_enable_sriov(pci_dev, num_vfs); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return num_vfs; |
|
} |
|
|
|
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 |
|
.sriov_configure = virtio_pci_sriov_configure, |
|
}; |
|
|
|
module_pci_driver(virtio_pci_driver); |
|
|
|
MODULE_AUTHOR("Anthony Liguori <[email protected]>"); |
|
MODULE_DESCRIPTION("virtio-pci"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_VERSION("1");
|
|
|