| /* |
| * 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> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #define VIRTIO_PCI_NO_LEGACY |
| #include "virtio_pci_common.h" |
| |
| static void __iomem *map_capability(struct pci_dev *dev, int off, |
| size_t minlen, |
| u32 align, |
| u32 start, u32 size, |
| size_t *len) |
| { |
| u8 bar; |
| u32 offset, length; |
| void __iomem *p; |
| |
| pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap, |
| bar), |
| &bar); |
| pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset), |
| &offset); |
| pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length), |
| &length); |
| |
| if (length <= start) { |
| dev_err(&dev->dev, |
| "virtio_pci: bad capability len %u (>%u expected)\n", |
| length, start); |
| return NULL; |
| } |
| |
| if (length - start < minlen) { |
| dev_err(&dev->dev, |
| "virtio_pci: bad capability len %u (>=%zu expected)\n", |
| length, minlen); |
| return NULL; |
| } |
| |
| length -= start; |
| |
| if (start + offset < offset) { |
| dev_err(&dev->dev, |
| "virtio_pci: map wrap-around %u+%u\n", |
| start, offset); |
| return NULL; |
| } |
| |
| offset += start; |
| |
| if (offset & (align - 1)) { |
| dev_err(&dev->dev, |
| "virtio_pci: offset %u not aligned to %u\n", |
| offset, align); |
| return NULL; |
| } |
| |
| if (length > size) |
| length = size; |
| |
| if (len) |
| *len = length; |
| |
| if (minlen + offset < minlen || |
| minlen + offset > pci_resource_len(dev, bar)) { |
| dev_err(&dev->dev, |
| "virtio_pci: map virtio %zu@%u " |
| "out of range on bar %i length %lu\n", |
| minlen, offset, |
| bar, (unsigned long)pci_resource_len(dev, bar)); |
| return NULL; |
| } |
| |
| p = pci_iomap_range(dev, bar, offset, length); |
| if (!p) |
| dev_err(&dev->dev, |
| "virtio_pci: unable to map virtio %u@%u on bar %i\n", |
| length, offset, bar); |
| return p; |
| } |
| |
| static void iowrite64_twopart(u64 val, __le32 __iomem *lo, __le32 __iomem *hi) |
| { |
| iowrite32((u32)val, lo); |
| iowrite32(val >> 32, hi); |
| } |
| |
| /* virtio config->get_features() implementation */ |
| static u64 vp_get_features(struct virtio_device *vdev) |
| { |
| struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
| u64 features; |
| |
| iowrite32(0, &vp_dev->common->device_feature_select); |
| features = ioread32(&vp_dev->common->device_feature); |
| iowrite32(1, &vp_dev->common->device_feature_select); |
| features |= ((u64)ioread32(&vp_dev->common->device_feature) << 32); |
| |
| return features; |
| } |
| |
| /* virtio config->finalize_features() implementation */ |
| static int vp_finalize_features(struct virtio_device *vdev) |
| { |
| struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
| |
| /* Give virtio_ring a chance to accept features. */ |
| vring_transport_features(vdev); |
| |
| 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; |
| } |
| |
| iowrite32(0, &vp_dev->common->guest_feature_select); |
| iowrite32((u32)vdev->features, &vp_dev->common->guest_feature); |
| iowrite32(1, &vp_dev->common->guest_feature_select); |
| iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature); |
| |
| return 0; |
| } |
| |
| /* 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); |
| u8 b; |
| __le16 w; |
| __le32 l; |
| |
| BUG_ON(offset + len > vp_dev->device_len); |
| |
| switch (len) { |
| case 1: |
| b = ioread8(vp_dev->device + offset); |
| memcpy(buf, &b, sizeof b); |
| break; |
| case 2: |
| w = cpu_to_le16(ioread16(vp_dev->device + offset)); |
| memcpy(buf, &w, sizeof w); |
| break; |
| case 4: |
| l = cpu_to_le32(ioread32(vp_dev->device + offset)); |
| memcpy(buf, &l, sizeof l); |
| break; |
| case 8: |
| l = cpu_to_le32(ioread32(vp_dev->device + offset)); |
| memcpy(buf, &l, sizeof l); |
| l = cpu_to_le32(ioread32(vp_dev->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 offset, |
| const void *buf, unsigned len) |
| { |
| struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
| u8 b; |
| __le16 w; |
| __le32 l; |
| |
| BUG_ON(offset + len > vp_dev->device_len); |
| |
| switch (len) { |
| case 1: |
| memcpy(&b, buf, sizeof b); |
| iowrite8(b, vp_dev->device + offset); |
| break; |
| case 2: |
| memcpy(&w, buf, sizeof w); |
| iowrite16(le16_to_cpu(w), vp_dev->device + offset); |
| break; |
| case 4: |
| memcpy(&l, buf, sizeof l); |
| iowrite32(le32_to_cpu(l), vp_dev->device + offset); |
| break; |
| case 8: |
| memcpy(&l, buf, sizeof l); |
| iowrite32(le32_to_cpu(l), vp_dev->device + offset); |
| memcpy(&l, buf + sizeof l, sizeof l); |
| iowrite32(le32_to_cpu(l), vp_dev->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 ioread8(&vp_dev->common->config_generation); |
| } |
| |
| /* 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->common->device_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); |
| iowrite8(status, &vp_dev->common->device_status); |
| } |
| |
| static void vp_reset(struct virtio_device *vdev) |
| { |
| struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
| /* 0 status means a reset. */ |
| iowrite8(0, &vp_dev->common->device_status); |
| /* Flush out the status write, and flush in device writes, |
| * including MSI-X interrupts, if any. */ |
| ioread8(&vp_dev->common->device_status); |
| /* Flush pending VQ/configuration callbacks. */ |
| vp_synchronize_vectors(vdev); |
| } |
| |
| static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector) |
| { |
| /* Setup the vector used for configuration events */ |
| iowrite16(vector, &vp_dev->common->msix_config); |
| /* Verify we had enough resources to assign the vector */ |
| /* Will also flush the write out to device */ |
| return ioread16(&vp_dev->common->msix_config); |
| } |
| |
| static size_t vring_pci_size(u16 num) |
| { |
| /* We only need a cacheline separation. */ |
| return PAGE_ALIGN(vring_size(num, SMP_CACHE_BYTES)); |
| } |
| |
| static void *alloc_virtqueue_pages(int *num) |
| { |
| void *pages; |
| |
| /* TODO: allocate each queue chunk individually */ |
| for (; *num && vring_pci_size(*num) > PAGE_SIZE; *num /= 2) { |
| pages = alloc_pages_exact(vring_pci_size(*num), |
| GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN); |
| if (pages) |
| return pages; |
| } |
| |
| if (!*num) |
| return NULL; |
| |
| /* Try to get a single page. You are my only hope! */ |
| return alloc_pages_exact(vring_pci_size(*num), GFP_KERNEL|__GFP_ZERO); |
| } |
| |
| static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, |
| struct virtio_pci_vq_info *info, |
| unsigned index, |
| void (*callback)(struct virtqueue *vq), |
| const char *name, |
| u16 msix_vec) |
| { |
| struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common; |
| struct virtqueue *vq; |
| u16 num, off; |
| int err; |
| |
| if (index >= ioread16(&cfg->num_queues)) |
| return ERR_PTR(-ENOENT); |
| |
| /* Select the queue we're interested in */ |
| iowrite16(index, &cfg->queue_select); |
| |
| /* Check if queue is either not available or already active. */ |
| num = ioread16(&cfg->queue_size); |
| if (!num || ioread8(&cfg->queue_enable)) |
| return ERR_PTR(-ENOENT); |
| |
| if (num & (num - 1)) { |
| dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| /* get offset of notification word for this vq */ |
| off = ioread16(&cfg->queue_notify_off); |
| |
| info->num = num; |
| info->msix_vector = msix_vec; |
| |
| info->queue = alloc_virtqueue_pages(&info->num); |
| if (info->queue == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| /* create the vring */ |
| vq = vring_new_virtqueue(index, info->num, |
| SMP_CACHE_BYTES, &vp_dev->vdev, |
| true, info->queue, vp_notify, callback, name); |
| if (!vq) { |
| err = -ENOMEM; |
| goto err_new_queue; |
| } |
| |
| /* activate the queue */ |
| iowrite16(num, &cfg->queue_size); |
| iowrite64_twopart(virt_to_phys(info->queue), |
| &cfg->queue_desc_lo, &cfg->queue_desc_hi); |
| iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)), |
| &cfg->queue_avail_lo, &cfg->queue_avail_hi); |
| iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)), |
| &cfg->queue_used_lo, &cfg->queue_used_hi); |
| |
| if (vp_dev->notify_base) { |
| /* offset should not wrap */ |
| if ((u64)off * vp_dev->notify_offset_multiplier + 2 |
| > vp_dev->notify_len) { |
| dev_warn(&vp_dev->pci_dev->dev, |
| "bad notification offset %u (x %u) " |
| "for queue %u > %zd", |
| off, vp_dev->notify_offset_multiplier, |
| index, vp_dev->notify_len); |
| err = -EINVAL; |
| goto err_map_notify; |
| } |
| vq->priv = (void __force *)vp_dev->notify_base + |
| off * vp_dev->notify_offset_multiplier; |
| } else { |
| vq->priv = (void __force *)map_capability(vp_dev->pci_dev, |
| vp_dev->notify_map_cap, 2, 2, |
| off * vp_dev->notify_offset_multiplier, 2, |
| NULL); |
| } |
| |
| if (!vq->priv) { |
| err = -ENOMEM; |
| goto err_map_notify; |
| } |
| |
| if (msix_vec != VIRTIO_MSI_NO_VECTOR) { |
| iowrite16(msix_vec, &cfg->queue_msix_vector); |
| msix_vec = ioread16(&cfg->queue_msix_vector); |
| if (msix_vec == VIRTIO_MSI_NO_VECTOR) { |
| err = -EBUSY; |
| goto err_assign_vector; |
| } |
| } |
| |
| return vq; |
| |
| err_assign_vector: |
| if (!vp_dev->notify_base) |
| pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv); |
| err_map_notify: |
| vring_del_virtqueue(vq); |
| err_new_queue: |
| free_pages_exact(info->queue, vring_pci_size(info->num)); |
| return ERR_PTR(err); |
| } |
| |
| static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
| struct virtqueue *vqs[], |
| vq_callback_t *callbacks[], |
| const char *names[]) |
| { |
| struct virtio_pci_device *vp_dev = to_vp_device(vdev); |
| struct virtqueue *vq; |
| int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names); |
| |
| 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) { |
| iowrite16(vq->index, &vp_dev->common->queue_select); |
| iowrite8(1, &vp_dev->common->queue_enable); |
| } |
| |
| 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); |
| |
| iowrite16(vq->index, &vp_dev->common->queue_select); |
| |
| if (vp_dev->msix_enabled) { |
| iowrite16(VIRTIO_MSI_NO_VECTOR, |
| &vp_dev->common->queue_msix_vector); |
| /* Flush the write out to device */ |
| ioread16(&vp_dev->common->queue_msix_vector); |
| } |
| |
| if (!vp_dev->notify_base) |
| pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv); |
| |
| vring_del_virtqueue(vq); |
| |
| free_pages_exact(info->queue, vring_pci_size(info->num)); |
| } |
| |
| 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, |
| .get_features = vp_get_features, |
| .finalize_features = vp_finalize_features, |
| .bus_name = vp_bus_name, |
| .set_vq_affinity = vp_set_vq_affinity, |
| }; |
| |
| 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, |
| .get_features = vp_get_features, |
| .finalize_features = vp_finalize_features, |
| .bus_name = vp_bus_name, |
| .set_vq_affinity = vp_set_vq_affinity, |
| }; |
| |
| /** |
| * virtio_pci_find_capability - walk capabilities to find device info. |
| * @dev: the pci device |
| * @cfg_type: the VIRTIO_PCI_CAP_* value we seek |
| * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO. |
| * |
| * Returns offset of the capability, or 0. |
| */ |
| static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type, |
| u32 ioresource_types) |
| { |
| 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, bar; |
| pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
| cfg_type), |
| &type); |
| pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap, |
| bar), |
| &bar); |
| |
| /* Ignore structures with reserved BAR values */ |
| if (bar > 0x5) |
| continue; |
| |
| if (type == cfg_type) { |
| if (pci_resource_len(dev, bar) && |
| pci_resource_flags(dev, bar) & ioresource_types) |
| return pos; |
| } |
| } |
| return 0; |
| } |
| |
| 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); |
| |
| kfree(vp_dev); |
| } |
| |
| /* This is part of the ABI. Don't screw with it. */ |
| static inline void check_offsets(void) |
| { |
| /* Note: disk space was harmed in compilation of this function. */ |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR != |
| offsetof(struct virtio_pci_cap, cap_vndr)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT != |
| offsetof(struct virtio_pci_cap, cap_next)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN != |
| offsetof(struct virtio_pci_cap, cap_len)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE != |
| offsetof(struct virtio_pci_cap, cfg_type)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR != |
| offsetof(struct virtio_pci_cap, bar)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET != |
| offsetof(struct virtio_pci_cap, offset)); |
| BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH != |
| offsetof(struct virtio_pci_cap, length)); |
| BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT != |
| offsetof(struct virtio_pci_notify_cap, |
| notify_off_multiplier)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT != |
| offsetof(struct virtio_pci_common_cfg, |
| device_feature_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF != |
| offsetof(struct virtio_pci_common_cfg, device_feature)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT != |
| offsetof(struct virtio_pci_common_cfg, |
| guest_feature_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF != |
| offsetof(struct virtio_pci_common_cfg, guest_feature)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX != |
| offsetof(struct virtio_pci_common_cfg, msix_config)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ != |
| offsetof(struct virtio_pci_common_cfg, num_queues)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS != |
| offsetof(struct virtio_pci_common_cfg, device_status)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION != |
| offsetof(struct virtio_pci_common_cfg, config_generation)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT != |
| offsetof(struct virtio_pci_common_cfg, queue_select)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE != |
| offsetof(struct virtio_pci_common_cfg, queue_size)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX != |
| offsetof(struct virtio_pci_common_cfg, queue_msix_vector)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE != |
| offsetof(struct virtio_pci_common_cfg, queue_enable)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF != |
| offsetof(struct virtio_pci_common_cfg, queue_notify_off)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO != |
| offsetof(struct virtio_pci_common_cfg, queue_desc_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI != |
| offsetof(struct virtio_pci_common_cfg, queue_desc_hi)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO != |
| offsetof(struct virtio_pci_common_cfg, queue_avail_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI != |
| offsetof(struct virtio_pci_common_cfg, queue_avail_hi)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO != |
| offsetof(struct virtio_pci_common_cfg, queue_used_lo)); |
| BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI != |
| offsetof(struct virtio_pci_common_cfg, queue_used_hi)); |
| } |
| |
| /* the PCI probing function */ |
| int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) |
| { |
| struct pci_dev *pci_dev = vp_dev->pci_dev; |
| int err, common, isr, notify, device; |
| u32 notify_length; |
| u32 notify_offset; |
| |
| check_offsets(); |
| |
| /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */ |
| if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f) |
| return -ENODEV; |
| |
| if (pci_dev->device < 0x1040) { |
| /* Transitional devices: use the PCI subsystem device id as |
| * virtio device id, same as legacy driver always did. |
| */ |
| vp_dev->vdev.id.device = pci_dev->subsystem_device; |
| } else { |
| /* Modern devices: simply use PCI device id, but start from 0x1040. */ |
| vp_dev->vdev.id.device = pci_dev->device - 0x1040; |
| } |
| vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor; |
| |
| if (virtio_device_is_legacy_only(vp_dev->vdev.id)) |
| return -ENODEV; |
| |
| /* check for a common config: if not, use legacy mode (bar 0). */ |
| common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM); |
| if (!common) { |
| dev_info(&pci_dev->dev, |
| "virtio_pci: leaving for legacy driver\n"); |
| return -ENODEV; |
| } |
| |
| /* If common is there, these should be too... */ |
| isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM); |
| notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM); |
| if (!isr || !notify) { |
| dev_err(&pci_dev->dev, |
| "virtio_pci: missing capabilities %i/%i/%i\n", |
| common, isr, notify); |
| return -EINVAL; |
| } |
| |
| /* Device capability is only mandatory for devices that have |
| * device-specific configuration. |
| */ |
| device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG, |
| IORESOURCE_IO | IORESOURCE_MEM); |
| |
| err = -EINVAL; |
| vp_dev->common = map_capability(pci_dev, common, |
| sizeof(struct virtio_pci_common_cfg), 4, |
| 0, sizeof(struct virtio_pci_common_cfg), |
| NULL); |
| if (!vp_dev->common) |
| goto err_map_common; |
| vp_dev->isr = map_capability(pci_dev, isr, sizeof(u8), 1, |
| 0, 1, |
| NULL); |
| if (!vp_dev->isr) |
| goto err_map_isr; |
| |
| /* Read notify_off_multiplier from config space. */ |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| notify_off_multiplier), |
| &vp_dev->notify_offset_multiplier); |
| /* Read notify length and offset from config space. */ |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| cap.length), |
| ¬ify_length); |
| |
| pci_read_config_dword(pci_dev, |
| notify + offsetof(struct virtio_pci_notify_cap, |
| cap.length), |
| ¬ify_offset); |
| |
| /* We don't know how many VQs we'll map, ahead of the time. |
| * If notify length is small, map it all now. |
| * Otherwise, map each VQ individually later. |
| */ |
| if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { |
| vp_dev->notify_base = map_capability(pci_dev, notify, 2, 2, |
| 0, notify_length, |
| &vp_dev->notify_len); |
| if (!vp_dev->notify_base) |
| goto err_map_notify; |
| } else { |
| vp_dev->notify_map_cap = notify; |
| } |
| |
| /* Again, we don't know how much we should map, but PAGE_SIZE |
| * is more than enough for all existing devices. |
| */ |
| if (device) { |
| vp_dev->device = map_capability(pci_dev, device, 0, 4, |
| 0, PAGE_SIZE, |
| &vp_dev->device_len); |
| if (!vp_dev->device) |
| goto err_map_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; |
| |
| return 0; |
| |
| err_map_device: |
| if (vp_dev->notify_base) |
| pci_iounmap(pci_dev, vp_dev->notify_base); |
| err_map_notify: |
| pci_iounmap(pci_dev, vp_dev->isr); |
| err_map_isr: |
| pci_iounmap(pci_dev, vp_dev->common); |
| err_map_common: |
| return err; |
| } |
| |
| void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) |
| { |
| struct pci_dev *pci_dev = vp_dev->pci_dev; |
| |
| if (vp_dev->device) |
| pci_iounmap(pci_dev, vp_dev->device); |
| if (vp_dev->notify_base) |
| pci_iounmap(pci_dev, vp_dev->notify_base); |
| pci_iounmap(pci_dev, vp_dev->isr); |
| pci_iounmap(pci_dev, vp_dev->common); |
| } |