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drivers/virtio/virtio_pci.c
22.1 KB
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/* * Virtio PCI driver * * This module allows virtio devices to be used over a virtual PCI device. * This can be used with QEMU based VMMs like KVM or Xen. * * Copyright IBM Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include <linux/module.h> #include <linux/list.h> #include <linux/pci.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> #include <linux/virtio.h> #include <linux/virtio_config.h> #include <linux/virtio_ring.h> #include <linux/virtio_pci.h> #include <linux/highmem.h> #include <linux/spinlock.h> MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); MODULE_DESCRIPTION("virtio-pci"); MODULE_LICENSE("GPL"); MODULE_VERSION("1"); /* Our device structure */ struct virtio_pci_device { struct virtio_device vdev; struct pci_dev *pci_dev; /* the IO mapping for the PCI config space */ |
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void __iomem *ioaddr; |
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/* a list of queues so we can dispatch IRQs */ spinlock_t lock; struct list_head virtqueues; |
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/* MSI-X support */ int msix_enabled; int intx_enabled; struct msix_entry *msix_entries; /* Name strings for interrupts. This size should be enough, * and I'm too lazy to allocate each name separately. */ char (*msix_names)[256]; /* Number of available vectors */ unsigned msix_vectors; |
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/* Vectors allocated, excluding per-vq vectors if any */ |
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unsigned msix_used_vectors; |
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/* Status saved during hibernate/restore */ u8 saved_status; |
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/* Whether we have vector per vq */ bool per_vq_vectors; |
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}; /* Constants for MSI-X */ /* Use first vector for configuration changes, second and the rest for * virtqueues Thus, we need at least 2 vectors for MSI. */ enum { VP_MSIX_CONFIG_VECTOR = 0, VP_MSIX_VQ_VECTOR = 1, |
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}; struct virtio_pci_vq_info { /* the actual virtqueue */ struct virtqueue *vq; /* the number of entries in the queue */ int num; /* the index of the queue */ int queue_index; /* the virtual address of the ring queue */ void *queue; /* the list node for the virtqueues list */ struct list_head node; |
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/* MSI-X vector (or none) */ |
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unsigned msix_vector; |
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}; /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ static struct pci_device_id virtio_pci_id_table[] = { { 0x1af4, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, { 0 }, }; MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); |
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/* Convert a generic virtio device to our structure */ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev) { return container_of(vdev, struct virtio_pci_device, vdev); } |
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/* virtio config->get_features() implementation */ static u32 vp_get_features(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); /* When someone needs more than 32 feature bits, we'll need to * steal a bit to indicate that the rest are somewhere else. */ return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES); } |
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/* virtio config->finalize_features() implementation */ static void vp_finalize_features(struct virtio_device *vdev) |
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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. */ vring_transport_features(vdev); |
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/* We only support 32 feature bits. */ BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1); iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES); |
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} /* virtio config->get() implementation */ static void vp_get(struct virtio_device *vdev, unsigned offset, void *buf, unsigned len) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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void __iomem *ioaddr = vp_dev->ioaddr + VIRTIO_PCI_CONFIG(vp_dev) + offset; |
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u8 *ptr = buf; int i; for (i = 0; i < len; i++) ptr[i] = ioread8(ioaddr + i); } /* the config->set() implementation. it's symmetric to the config->get() * implementation */ static void vp_set(struct virtio_device *vdev, unsigned offset, const void *buf, unsigned len) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
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void __iomem *ioaddr = vp_dev->ioaddr + VIRTIO_PCI_CONFIG(vp_dev) + offset; |
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const u8 *ptr = buf; int i; for (i = 0; i < len; i++) iowrite8(ptr[i], ioaddr + i); } /* config->{get,set}_status() implementations */ static u8 vp_get_status(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS); } static void vp_set_status(struct virtio_device *vdev, u8 status) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); /* We should never be setting status to 0. */ BUG_ON(status == 0); |
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iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS); |
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} |
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/* wait for pending irq handlers */ static void vp_synchronize_vectors(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); int i; if (vp_dev->intx_enabled) synchronize_irq(vp_dev->pci_dev->irq); for (i = 0; i < vp_dev->msix_vectors; ++i) synchronize_irq(vp_dev->msix_entries[i].vector); } |
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static void vp_reset(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); /* 0 status means a reset. */ |
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iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS); |
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/* Flush out the status write, and flush in device writes, * including MSi-X interrupts, if any. */ ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS); /* Flush pending VQ/configuration callbacks. */ vp_synchronize_vectors(vdev); |
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} /* the notify function used when creating a virt queue */ static void vp_notify(struct virtqueue *vq) { struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_vq_info *info = vq->priv; /* we write the queue's selector into the notification register to * signal the other end */ iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY); } |
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/* Handle a configuration change: Tell driver if it wants to know. */ static irqreturn_t vp_config_changed(int irq, void *opaque) { struct virtio_pci_device *vp_dev = opaque; struct virtio_driver *drv; drv = container_of(vp_dev->vdev.dev.driver, struct virtio_driver, driver); if (drv && drv->config_changed) drv->config_changed(&vp_dev->vdev); return IRQ_HANDLED; } /* Notify all virtqueues on an interrupt. */ static irqreturn_t vp_vring_interrupt(int irq, void *opaque) { struct virtio_pci_device *vp_dev = opaque; struct virtio_pci_vq_info *info; irqreturn_t ret = IRQ_NONE; unsigned long flags; spin_lock_irqsave(&vp_dev->lock, flags); list_for_each_entry(info, &vp_dev->virtqueues, node) { if (vring_interrupt(irq, info->vq) == IRQ_HANDLED) ret = IRQ_HANDLED; } spin_unlock_irqrestore(&vp_dev->lock, flags); return ret; } |
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/* A small wrapper to also acknowledge the interrupt when it's handled. * I really need an EIO hook for the vring so I can ack the interrupt once we * know that we'll be handling the IRQ but before we invoke the callback since * the callback may notify the host which results in the host attempting to * raise an interrupt that we would then mask once we acknowledged the * interrupt. */ static irqreturn_t vp_interrupt(int irq, void *opaque) { struct virtio_pci_device *vp_dev = opaque; |
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u8 isr; /* reading the ISR has the effect of also clearing it so it's very * important to save off the value. */ isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR); /* It's definitely not us if the ISR was not high */ if (!isr) return IRQ_NONE; /* Configuration change? Tell driver if it wants to know. */ |
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if (isr & VIRTIO_PCI_ISR_CONFIG) vp_config_changed(irq, opaque); |
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|
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return vp_vring_interrupt(irq, opaque); |
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} |
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static void vp_free_vectors(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); int i; if (vp_dev->intx_enabled) { free_irq(vp_dev->pci_dev->irq, vp_dev); vp_dev->intx_enabled = 0; } for (i = 0; i < vp_dev->msix_used_vectors; ++i) free_irq(vp_dev->msix_entries[i].vector, vp_dev); |
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if (vp_dev->msix_enabled) { /* Disable the vector used for configuration */ iowrite16(VIRTIO_MSI_NO_VECTOR, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); /* Flush the write out to device */ ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); |
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pci_disable_msix(vp_dev->pci_dev); |
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vp_dev->msix_enabled = 0; vp_dev->msix_vectors = 0; |
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} |
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vp_dev->msix_used_vectors = 0; kfree(vp_dev->msix_names); vp_dev->msix_names = NULL; kfree(vp_dev->msix_entries); vp_dev->msix_entries = NULL; |
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} |
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static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors, bool per_vq_vectors) |
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{ struct virtio_pci_device *vp_dev = to_vp_device(vdev); const char *name = dev_name(&vp_dev->vdev.dev); unsigned i, v; int err = -ENOMEM; |
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|
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vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries, GFP_KERNEL); if (!vp_dev->msix_entries) |
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goto error; |
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vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names, GFP_KERNEL); if (!vp_dev->msix_names) |
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goto error; |
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for (i = 0; i < nvectors; ++i) vp_dev->msix_entries[i].entry = i; |
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/* pci_enable_msix returns positive if we can't get this many. */ |
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err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors); if (err > 0) err = -ENOSPC; if (err) goto error; vp_dev->msix_vectors = nvectors; vp_dev->msix_enabled = 1; /* Set the vector used for configuration */ v = vp_dev->msix_used_vectors; snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, "%s-config", name); err = request_irq(vp_dev->msix_entries[v].vector, vp_config_changed, 0, vp_dev->msix_names[v], vp_dev); if (err) goto error; ++vp_dev->msix_used_vectors; |
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|
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iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); /* Verify we had enough resources to assign the vector */ v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR); if (v == VIRTIO_MSI_NO_VECTOR) { err = -EBUSY; goto error; |
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} |
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if (!per_vq_vectors) { |
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/* Shared vector for all VQs */ v = vp_dev->msix_used_vectors; snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, "%s-virtqueues", name); err = request_irq(vp_dev->msix_entries[v].vector, vp_vring_interrupt, 0, vp_dev->msix_names[v], vp_dev); if (err) |
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goto error; |
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++vp_dev->msix_used_vectors; } return 0; |
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error: |
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vp_free_vectors(vdev); |
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return err; } |
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static int vp_request_intx(struct virtio_device *vdev) { int err; struct virtio_pci_device *vp_dev = to_vp_device(vdev); err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, dev_name(&vdev->dev), vp_dev); if (!err) vp_dev->intx_enabled = 1; return err; } static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index, void (*callback)(struct virtqueue *vq), const char *name, u16 msix_vec) |
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{ struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_vq_info *info; struct virtqueue *vq; |
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unsigned long flags, size; |
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u16 num; |
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int err; /* Select the queue we're interested in */ iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL); /* Check if queue is either not available or already active. */ num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM); if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN)) return ERR_PTR(-ENOENT); /* allocate and fill out our structure the represents an active * queue */ info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL); if (!info) return ERR_PTR(-ENOMEM); info->queue_index = index; info->num = num; |
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info->msix_vector = msix_vec; |
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|
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size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN)); |
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info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO); |
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if (info->queue == NULL) { err = -ENOMEM; goto out_info; } /* activate the queue */ |
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iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT, |
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vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN); /* create the vring */ |
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vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN, vdev, true, info->queue, vp_notify, callback, name); |
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if (!vq) { err = -ENOMEM; goto out_activate_queue; } vq->priv = info; info->vq = vq; |
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if (msix_vec != VIRTIO_MSI_NO_VECTOR) { iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); if (msix_vec == VIRTIO_MSI_NO_VECTOR) { |
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err = -EBUSY; goto out_assign; } } |
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if (callback) { spin_lock_irqsave(&vp_dev->lock, flags); list_add(&info->node, &vp_dev->virtqueues); spin_unlock_irqrestore(&vp_dev->lock, flags); } else { INIT_LIST_HEAD(&info->node); } |
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return vq; |
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out_assign: |
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vring_del_virtqueue(vq); |
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out_activate_queue: iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN); |
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free_pages_exact(info->queue, size); |
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out_info: kfree(info); return ERR_PTR(err); } |
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static void vp_del_vq(struct virtqueue *vq) { struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_vq_info *info = vq->priv; |
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unsigned long flags, size; spin_lock_irqsave(&vp_dev->lock, flags); list_del(&info->node); spin_unlock_irqrestore(&vp_dev->lock, flags); |
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iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL); |
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if (vp_dev->msix_enabled) { iowrite16(VIRTIO_MSI_NO_VECTOR, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR); /* Flush the write out to device */ ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR); } |
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vring_del_virtqueue(vq); /* Select and deactivate the queue */ |
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iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN); |
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size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN)); |
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free_pages_exact(info->queue, size); |
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kfree(info); } |
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/* the config->del_vqs() implementation */ |
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static void vp_del_vqs(struct virtio_device *vdev) { |
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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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struct virtio_pci_vq_info *info; |
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) { info = vq->priv; |
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if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR) |
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free_irq(vp_dev->msix_entries[info->msix_vector].vector, vq); |
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vp_del_vq(vq); |
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} vp_dev->per_vq_vectors = false; |
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vp_free_vectors(vdev); |
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} |
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static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], const char *names[], |
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bool use_msix, |
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bool per_vq_vectors) |
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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; int i, err, nvectors, allocated_vectors; |
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if (!use_msix) { /* Old style: one normal interrupt for change and all vqs. */ err = vp_request_intx(vdev); if (err) goto error_request; } else { if (per_vq_vectors) { /* Best option: one for change interrupt, one per vq. */ nvectors = 1; for (i = 0; i < nvqs; ++i) if (callbacks[i]) ++nvectors; } else { /* Second best: one for change, shared for all vqs. */ nvectors = 2; } err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors); if (err) goto error_request; } |
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vp_dev->per_vq_vectors = per_vq_vectors; allocated_vectors = vp_dev->msix_used_vectors; |
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520 |
for (i = 0; i < nvqs; ++i) { |
e969fed54 virtio: refactor ... |
521 |
if (!callbacks[i] || !vp_dev->msix_enabled) |
f68d24082 virtio_pci: minor... |
522 |
msix_vec = VIRTIO_MSI_NO_VECTOR; |
e969fed54 virtio: refactor ... |
523 |
else if (vp_dev->per_vq_vectors) |
f68d24082 virtio_pci: minor... |
524 |
msix_vec = allocated_vectors++; |
e969fed54 virtio: refactor ... |
525 |
else |
f68d24082 virtio_pci: minor... |
526 527 |
msix_vec = VP_MSIX_VQ_VECTOR; vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec); |
e969fed54 virtio: refactor ... |
528 529 |
if (IS_ERR(vqs[i])) { err = PTR_ERR(vqs[i]); |
82af8ce84 virtio_pci: optio... |
530 |
goto error_find; |
e969fed54 virtio: refactor ... |
531 |
} |
0b22bd0ba virtio-pci: fix p... |
532 533 534 |
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) continue; |
e969fed54 virtio: refactor ... |
535 |
/* allocate per-vq irq if available and necessary */ |
0b22bd0ba virtio-pci: fix p... |
536 537 538 539 540 541 542 543 544 545 546 |
snprintf(vp_dev->msix_names[msix_vec], sizeof *vp_dev->msix_names, "%s-%s", dev_name(&vp_dev->vdev.dev), names[i]); err = request_irq(vp_dev->msix_entries[msix_vec].vector, vring_interrupt, 0, vp_dev->msix_names[msix_vec], vqs[i]); if (err) { vp_del_vq(vqs[i]); goto error_find; |
e969fed54 virtio: refactor ... |
547 |
} |
d2a7ddda9 virtio: find_vqs/... |
548 549 |
} return 0; |
82af8ce84 virtio_pci: optio... |
550 |
error_find: |
d2a7ddda9 virtio: find_vqs/... |
551 |
vp_del_vqs(vdev); |
82af8ce84 virtio_pci: optio... |
552 553 |
error_request: |
e969fed54 virtio: refactor ... |
554 555 556 557 558 559 560 561 562 |
return err; } /* the config->find_vqs() implementation */ static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], const char *names[]) { |
f68d24082 virtio_pci: minor... |
563 |
int err; |
e969fed54 virtio: refactor ... |
564 |
|
f68d24082 virtio_pci: minor... |
565 566 |
/* Try MSI-X with one vector per queue. */ err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true); |
e969fed54 virtio: refactor ... |
567 568 |
if (!err) return 0; |
f68d24082 virtio_pci: minor... |
569 |
/* Fallback: MSI-X with one vector for config, one shared for queues. */ |
e969fed54 virtio: refactor ... |
570 |
err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, |
f68d24082 virtio_pci: minor... |
571 |
true, false); |
e969fed54 virtio: refactor ... |
572 573 574 |
if (!err) return 0; /* Finally fall back to regular interrupts. */ |
f68d24082 virtio_pci: minor... |
575 576 |
return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, false, false); |
d2a7ddda9 virtio: find_vqs/... |
577 |
} |
66846048f enable virtio_net... |
578 579 580 581 582 583 |
static const char *vp_bus_name(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); return pci_name(vp_dev->pci_dev); } |
3343660d8 virtio: PCI device |
584 |
static struct virtio_config_ops virtio_pci_config_ops = { |
3343660d8 virtio: PCI device |
585 586 587 588 589 |
.get = vp_get, .set = vp_set, .get_status = vp_get_status, .set_status = vp_set_status, .reset = vp_reset, |
d2a7ddda9 virtio: find_vqs/... |
590 591 |
.find_vqs = vp_find_vqs, .del_vqs = vp_del_vqs, |
c45a6816c virtio: explicit ... |
592 |
.get_features = vp_get_features, |
c624896e4 virtio: Rename se... |
593 |
.finalize_features = vp_finalize_features, |
66846048f enable virtio_net... |
594 |
.bus_name = vp_bus_name, |
3343660d8 virtio: PCI device |
595 |
}; |
29f9f12ec virtio: add PCI d... |
596 597 |
static void virtio_pci_release_dev(struct device *_d) { |
72103bd12 virtio-pci: fix u... |
598 599 600 601 602 |
/* * No need for a release method as we allocate/free * all devices together with the pci devices. * Provide an empty one to avoid getting a warning from core. */ |
29f9f12ec virtio: add PCI d... |
603 |
} |
3343660d8 virtio: PCI device |
604 605 606 607 608 609 610 611 612 613 |
/* the PCI probing function */ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id) { struct virtio_pci_device *vp_dev; int err; /* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */ if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f) return -ENODEV; |
55a7c0660 virtio: Use PCI r... |
614 615 616 617 618 619 |
if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) { printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d ", VIRTIO_PCI_ABI_VERSION, pci_dev->revision); return -ENODEV; } |
3343660d8 virtio: PCI device |
620 621 622 623 |
/* allocate our structure and fill it out */ vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); if (vp_dev == NULL) return -ENOMEM; |
8b3bb3ecf virtio: remove vi... |
624 |
vp_dev->vdev.dev.parent = &pci_dev->dev; |
29f9f12ec virtio: add PCI d... |
625 |
vp_dev->vdev.dev.release = virtio_pci_release_dev; |
3343660d8 virtio: PCI device |
626 627 628 629 |
vp_dev->vdev.config = &virtio_pci_config_ops; vp_dev->pci_dev = pci_dev; INIT_LIST_HEAD(&vp_dev->virtqueues); spin_lock_init(&vp_dev->lock); |
b03214d55 virtio-pci: disab... |
630 631 |
/* Disable MSI/MSIX to bring device to a known good state. */ pci_msi_off(pci_dev); |
3343660d8 virtio: PCI device |
632 633 634 635 636 637 638 639 640 641 642 643 644 645 |
/* enable the device */ err = pci_enable_device(pci_dev); if (err) goto out; err = pci_request_regions(pci_dev, "virtio-pci"); if (err) goto out_enable_device; vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0); if (vp_dev->ioaddr == NULL) goto out_req_regions; pci_set_drvdata(pci_dev, vp_dev); |
bc505f373 virtio: set pci b... |
646 |
pci_set_master(pci_dev); |
3343660d8 virtio: PCI device |
647 648 649 650 |
/* we use the subsystem vendor/device id as the virtio vendor/device * id. this allows us to use the same PCI vendor/device id for all * virtio devices and to identify the particular virtio driver by |
883931612 Fix typos in comm... |
651 |
* the subsystem ids */ |
3343660d8 virtio: PCI device |
652 653 |
vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor; vp_dev->vdev.id.device = pci_dev->subsystem_device; |
3343660d8 virtio: PCI device |
654 655 656 |
/* finally register the virtio device */ err = register_virtio_device(&vp_dev->vdev); if (err) |
82af8ce84 virtio_pci: optio... |
657 |
goto out_set_drvdata; |
3343660d8 virtio: PCI device |
658 659 |
return 0; |
3343660d8 virtio: PCI device |
660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 |
out_set_drvdata: pci_set_drvdata(pci_dev, NULL); pci_iounmap(pci_dev, vp_dev->ioaddr); out_req_regions: pci_release_regions(pci_dev); out_enable_device: pci_disable_device(pci_dev); out: kfree(vp_dev); return err; } static void __devexit virtio_pci_remove(struct pci_dev *pci_dev) { struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); |
bd6c26900 virtio_pci: unreg... |
675 |
unregister_virtio_device(&vp_dev->vdev); |
31a3ddda1 virtio_pci: Preve... |
676 677 678 679 680 681 |
vp_del_vqs(&vp_dev->vdev); pci_set_drvdata(pci_dev, NULL); pci_iounmap(pci_dev, vp_dev->ioaddr); pci_release_regions(pci_dev); pci_disable_device(pci_dev); |
72103bd12 virtio-pci: fix u... |
682 |
kfree(vp_dev); |
3343660d8 virtio: PCI device |
683 684 685 |
} #ifdef CONFIG_PM |
d07753638 virtio: pci: swit... |
686 |
static int virtio_pci_suspend(struct device *dev) |
3343660d8 virtio: PCI device |
687 |
{ |
d07753638 virtio: pci: swit... |
688 |
struct pci_dev *pci_dev = to_pci_dev(dev); |
3343660d8 virtio: PCI device |
689 690 691 692 |
pci_save_state(pci_dev); pci_set_power_state(pci_dev, PCI_D3hot); return 0; } |
d07753638 virtio: pci: swit... |
693 |
static int virtio_pci_resume(struct device *dev) |
3343660d8 virtio: PCI device |
694 |
{ |
d07753638 virtio: pci: swit... |
695 |
struct pci_dev *pci_dev = to_pci_dev(dev); |
3343660d8 virtio: PCI device |
696 697 698 699 |
pci_restore_state(pci_dev); pci_set_power_state(pci_dev, PCI_D0); return 0; } |
d07753638 virtio: pci: swit... |
700 |
|
f0fe6f115 virtio: pci: add ... |
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 |
static int virtio_pci_freeze(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); struct virtio_driver *drv; int ret; drv = container_of(vp_dev->vdev.dev.driver, struct virtio_driver, driver); ret = 0; vp_dev->saved_status = vp_get_status(&vp_dev->vdev); if (drv && drv->freeze) ret = drv->freeze(&vp_dev->vdev); if (!ret) pci_disable_device(pci_dev); return ret; } static int restore_common(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); vp_finalize_features(&vp_dev->vdev); return ret; } static int virtio_pci_thaw(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); struct virtio_driver *drv; int ret; ret = restore_common(dev); if (ret) return ret; drv = container_of(vp_dev->vdev.dev.driver, struct virtio_driver, driver); if (drv && drv->thaw) ret = drv->thaw(&vp_dev->vdev); else if (drv && drv->restore) ret = drv->restore(&vp_dev->vdev); /* Finally, tell the device we're all set */ if (!ret) vp_set_status(&vp_dev->vdev, vp_dev->saved_status); return ret; } 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); struct virtio_driver *drv; int ret; drv = container_of(vp_dev->vdev.dev.driver, struct virtio_driver, driver); ret = restore_common(dev); if (!ret && drv && drv->restore) ret = drv->restore(&vp_dev->vdev); /* Finally, tell the device we're all set */ if (!ret) vp_set_status(&vp_dev->vdev, vp_dev->saved_status); return ret; } |
d07753638 virtio: pci: swit... |
782 |
static const struct dev_pm_ops virtio_pci_pm_ops = { |
f0fe6f115 virtio: pci: add ... |
783 784 785 786 787 788 |
.suspend = virtio_pci_suspend, .resume = virtio_pci_resume, .freeze = virtio_pci_freeze, .thaw = virtio_pci_thaw, .restore = virtio_pci_restore, .poweroff = virtio_pci_suspend, |
d07753638 virtio: pci: swit... |
789 |
}; |
3343660d8 virtio: PCI device |
790 791 792 793 794 795 |
#endif static struct pci_driver virtio_pci_driver = { .name = "virtio-pci", .id_table = virtio_pci_id_table, .probe = virtio_pci_probe, |
1f08b833d Add __devexit_p a... |
796 |
.remove = __devexit_p(virtio_pci_remove), |
3343660d8 virtio: PCI device |
797 |
#ifdef CONFIG_PM |
d07753638 virtio: pci: swit... |
798 |
.driver.pm = &virtio_pci_pm_ops, |
3343660d8 virtio: PCI device |
799 800 801 802 803 |
#endif }; static int __init virtio_pci_init(void) { |
8b3bb3ecf virtio: remove vi... |
804 |
return pci_register_driver(&virtio_pci_driver); |
3343660d8 virtio: PCI device |
805 806 807 808 809 810 |
} module_init(virtio_pci_init); static void __exit virtio_pci_exit(void) { |
3343660d8 virtio: PCI device |
811 812 813 814 |
pci_unregister_driver(&virtio_pci_driver); } module_exit(virtio_pci_exit); |