Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jason (Hui) Wang | 1054 | 40.95% | 19 | 35.85% |
Michael S. Tsirkin | 827 | 32.13% | 15 | 28.30% |
Xuan Zhuo | 380 | 14.76% | 3 | 5.66% |
Sebastien Boeuf | 113 | 4.39% | 1 | 1.89% |
Anthony Liguori | 53 | 2.06% | 1 | 1.89% |
Tiwei Bie | 40 | 1.55% | 1 | 1.89% |
Rusty Russell | 22 | 0.85% | 2 | 3.77% |
Christoph Hellwig | 18 | 0.70% | 3 | 5.66% |
Gerd Hoffmann | 18 | 0.70% | 1 | 1.89% |
Keir Fraser | 17 | 0.66% | 1 | 1.89% |
Andrew Lutomirski | 16 | 0.62% | 1 | 1.89% |
Solomon Tan | 6 | 0.23% | 1 | 1.89% |
Shaoqin Huang | 4 | 0.16% | 1 | 1.89% |
Matej Genci | 3 | 0.12% | 1 | 1.89% |
Thomas Gleixner | 2 | 0.08% | 1 | 1.89% |
Angus Chen | 1 | 0.04% | 1 | 1.89% |
Total | 2574 | 53 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Virtio PCI driver - modern (virtio 1.0) device support * * 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 * Copyright Red Hat, Inc. 2014 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * Rusty Russell <rusty@rustcorp.com.au> * Michael S. Tsirkin <mst@redhat.com> */ #include <linux/delay.h> #define VIRTIO_PCI_NO_LEGACY #define VIRTIO_RING_NO_LEGACY #include "virtio_pci_common.h" static u64 vp_get_features(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); return vp_modern_get_features(&vp_dev->mdev); } static void vp_transport_features(struct virtio_device *vdev, u64 features) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct pci_dev *pci_dev = vp_dev->pci_dev; if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV)) __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); if (features & BIT_ULL(VIRTIO_F_RING_RESET)) __virtio_set_bit(vdev, VIRTIO_F_RING_RESET); } /* virtio config->finalize_features() implementation */ static int vp_finalize_features(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); u64 features = vdev->features; /* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); /* Give virtio_pci a chance to accept features. */ vp_transport_features(vdev, features); if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { dev_err(&vdev->dev, "virtio: device uses modern interface " "but does not have VIRTIO_F_VERSION_1\n"); return -EINVAL; } vp_modern_set_features(&vp_dev->mdev, vdev->features); return 0; } /* virtio config->get() implementation */ static void vp_get(struct virtio_device *vdev, unsigned int offset, void *buf, unsigned int len) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; void __iomem *device = mdev->device; u8 b; __le16 w; __le32 l; BUG_ON(offset + len > mdev->device_len); switch (len) { case 1: b = ioread8(device + offset); memcpy(buf, &b, sizeof b); break; case 2: w = cpu_to_le16(ioread16(device + offset)); memcpy(buf, &w, sizeof w); break; case 4: l = cpu_to_le32(ioread32(device + offset)); memcpy(buf, &l, sizeof l); break; case 8: l = cpu_to_le32(ioread32(device + offset)); memcpy(buf, &l, sizeof l); l = cpu_to_le32(ioread32(device + offset + sizeof l)); memcpy(buf + sizeof l, &l, sizeof l); break; default: BUG(); } } /* the config->set() implementation. it's symmetric to the config->get() * implementation */ static void vp_set(struct virtio_device *vdev, unsigned int offset, const void *buf, unsigned int len) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; void __iomem *device = mdev->device; u8 b; __le16 w; __le32 l; BUG_ON(offset + len > mdev->device_len); switch (len) { case 1: memcpy(&b, buf, sizeof b); iowrite8(b, device + offset); break; case 2: memcpy(&w, buf, sizeof w); iowrite16(le16_to_cpu(w), device + offset); break; case 4: memcpy(&l, buf, sizeof l); iowrite32(le32_to_cpu(l), device + offset); break; case 8: memcpy(&l, buf, sizeof l); iowrite32(le32_to_cpu(l), device + offset); memcpy(&l, buf + sizeof l, sizeof l); iowrite32(le32_to_cpu(l), device + offset + sizeof l); break; default: BUG(); } } static u32 vp_generation(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); return vp_modern_generation(&vp_dev->mdev); } /* 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 vp_modern_get_status(&vp_dev->mdev); } 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); vp_modern_set_status(&vp_dev->mdev, status); } static void vp_reset(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; /* 0 status means a reset. */ vp_modern_set_status(mdev, 0); /* After writing 0 to device_status, the driver MUST wait for a read of * device_status to return 0 before reinitializing the device. * This will flush out the status write, and flush in device writes, * including MSI-X interrupts, if any. */ while (vp_modern_get_status(mdev)) msleep(1); /* Flush pending VQ/configuration callbacks. */ vp_synchronize_vectors(vdev); } static int vp_active_vq(struct virtqueue *vq, u16 msix_vec) { struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; unsigned long index; index = vq->index; /* activate the queue */ vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq)); vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq), virtqueue_get_avail_addr(vq), virtqueue_get_used_addr(vq)); if (msix_vec != VIRTIO_MSI_NO_VECTOR) { msix_vec = vp_modern_queue_vector(mdev, index, msix_vec); if (msix_vec == VIRTIO_MSI_NO_VECTOR) return -EBUSY; } return 0; } static int vp_modern_disable_vq_and_reset(struct virtqueue *vq) { struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; struct virtio_pci_vq_info *info; unsigned long flags; if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET)) return -ENOENT; vp_modern_set_queue_reset(mdev, vq->index); info = vp_dev->vqs[vq->index]; /* delete vq from irq handler */ spin_lock_irqsave(&vp_dev->lock, flags); list_del(&info->node); spin_unlock_irqrestore(&vp_dev->lock, flags); INIT_LIST_HEAD(&info->node); #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION __virtqueue_break(vq); #endif /* For the case where vq has an exclusive irq, call synchronize_irq() to * wait for completion. * * note: We can't use disable_irq() since it conflicts with the affinity * managed IRQ that is used by some drivers. */ if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR) synchronize_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector)); vq->reset = true; return 0; } static int vp_modern_enable_vq_after_reset(struct virtqueue *vq) { struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; struct virtio_pci_vq_info *info; unsigned long flags, index; int err; if (!vq->reset) return -EBUSY; index = vq->index; info = vp_dev->vqs[index]; if (vp_modern_get_queue_reset(mdev, index)) return -EBUSY; if (vp_modern_get_queue_enable(mdev, index)) return -EBUSY; err = vp_active_vq(vq, info->msix_vector); if (err) return err; if (vq->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); } #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION __virtqueue_unbreak(vq); #endif vp_modern_set_queue_enable(&vp_dev->mdev, index, true); vq->reset = false; return 0; } static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector) { return vp_modern_config_vector(&vp_dev->mdev, vector); } static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, struct virtio_pci_vq_info *info, unsigned int index, void (*callback)(struct virtqueue *vq), const char *name, bool ctx, u16 msix_vec) { struct virtio_pci_modern_device *mdev = &vp_dev->mdev; struct virtqueue *vq; u16 num; int err; if (index >= vp_modern_get_num_queues(mdev)) return ERR_PTR(-EINVAL); /* Check if queue is either not available or already active. */ num = vp_modern_get_queue_size(mdev, index); if (!num || vp_modern_get_queue_enable(mdev, index)) return ERR_PTR(-ENOENT); if (!is_power_of_2(num)) { dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num); return ERR_PTR(-EINVAL); } info->msix_vector = msix_vec; /* create the vring */ vq = vring_create_virtqueue(index, num, SMP_CACHE_BYTES, &vp_dev->vdev, true, true, ctx, vp_notify, callback, name); if (!vq) return ERR_PTR(-ENOMEM); vq->num_max = num; err = vp_active_vq(vq, msix_vec); if (err) goto err; vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL); if (!vq->priv) { err = -ENOMEM; goto err; } return vq; err: vring_del_virtqueue(vq); return ERR_PTR(err); } static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], const char * const names[], const bool *ctx, struct irq_affinity *desc) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct virtqueue *vq; int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc); if (rc) return rc; /* Select and activate all queues. Has to be done last: once we do * this, there's no way to go back except reset. */ list_for_each_entry(vq, &vdev->vqs, list) vp_modern_set_queue_enable(&vp_dev->mdev, vq->index, true); return 0; } static void del_vq(struct virtio_pci_vq_info *info) { struct virtqueue *vq = info->vq; struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); struct virtio_pci_modern_device *mdev = &vp_dev->mdev; if (vp_dev->msix_enabled) vp_modern_queue_vector(mdev, vq->index, VIRTIO_MSI_NO_VECTOR); if (!mdev->notify_base) pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv); vring_del_virtqueue(vq); } static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id, u8 *bar, u64 *offset, u64 *len) { int pos; for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0; pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) { u8 type, cap_len, id, res_bar; u32 tmp32; u64 res_offset, res_length; pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, cfg_type), &type); if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG) continue; pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, cap_len), &cap_len); if (cap_len != sizeof(struct virtio_pci_cap64)) { dev_err(&dev->dev, "%s: shm cap with bad size offset:" " %d size: %d\n", __func__, pos, cap_len); continue; } pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, id), &id); if (id != required_id) continue; pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, bar), &res_bar); if (res_bar >= PCI_STD_NUM_BARS) continue; /* Type and ID match, and the BAR value isn't reserved. * Looks good. */ /* Read the lower 32bit of length and offset */ pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, offset), &tmp32); res_offset = tmp32; pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, length), &tmp32); res_length = tmp32; /* and now the top half */ pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap64, offset_hi), &tmp32); res_offset |= ((u64)tmp32) << 32; pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap64, length_hi), &tmp32); res_length |= ((u64)tmp32) << 32; *bar = res_bar; *offset = res_offset; *len = res_length; return pos; } return 0; } static bool vp_get_shm_region(struct virtio_device *vdev, struct virtio_shm_region *region, u8 id) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); struct pci_dev *pci_dev = vp_dev->pci_dev; u8 bar; u64 offset, len; phys_addr_t phys_addr; size_t bar_len; if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len)) return false; phys_addr = pci_resource_start(pci_dev, bar); bar_len = pci_resource_len(pci_dev, bar); if ((offset + len) < offset) { dev_err(&pci_dev->dev, "%s: cap offset+len overflow detected\n", __func__); return false; } if (offset + len > bar_len) { dev_err(&pci_dev->dev, "%s: bar shorter than cap offset+len\n", __func__); return false; } region->len = len; region->addr = (u64) phys_addr + offset; return true; } static const struct virtio_config_ops virtio_pci_config_nodev_ops = { .get = NULL, .set = NULL, .generation = vp_generation, .get_status = vp_get_status, .set_status = vp_set_status, .reset = vp_reset, .find_vqs = vp_modern_find_vqs, .del_vqs = vp_del_vqs, .synchronize_cbs = vp_synchronize_vectors, .get_features = vp_get_features, .finalize_features = vp_finalize_features, .bus_name = vp_bus_name, .set_vq_affinity = vp_set_vq_affinity, .get_vq_affinity = vp_get_vq_affinity, .get_shm_region = vp_get_shm_region, .disable_vq_and_reset = vp_modern_disable_vq_and_reset, .enable_vq_after_reset = vp_modern_enable_vq_after_reset, }; static const struct virtio_config_ops virtio_pci_config_ops = { .get = vp_get, .set = vp_set, .generation = vp_generation, .get_status = vp_get_status, .set_status = vp_set_status, .reset = vp_reset, .find_vqs = vp_modern_find_vqs, .del_vqs = vp_del_vqs, .synchronize_cbs = vp_synchronize_vectors, .get_features = vp_get_features, .finalize_features = vp_finalize_features, .bus_name = vp_bus_name, .set_vq_affinity = vp_set_vq_affinity, .get_vq_affinity = vp_get_vq_affinity, .get_shm_region = vp_get_shm_region, .disable_vq_and_reset = vp_modern_disable_vq_and_reset, .enable_vq_after_reset = vp_modern_enable_vq_after_reset, }; /* the PCI probing function */ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) { struct virtio_pci_modern_device *mdev = &vp_dev->mdev; struct pci_dev *pci_dev = vp_dev->pci_dev; int err; mdev->pci_dev = pci_dev; err = vp_modern_probe(mdev); if (err) return err; if (mdev->device) vp_dev->vdev.config = &virtio_pci_config_ops; else vp_dev->vdev.config = &virtio_pci_config_nodev_ops; vp_dev->config_vector = vp_config_vector; vp_dev->setup_vq = setup_vq; vp_dev->del_vq = del_vq; vp_dev->isr = mdev->isr; vp_dev->vdev.id = mdev->id; return 0; } void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) { struct virtio_pci_modern_device *mdev = &vp_dev->mdev; vp_modern_remove(mdev); }
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