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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * vDPA bridge driver for modern virtio-pci device
- *
- * Copyright (c) 2020, Red Hat Inc. All rights reserved.
- * Author: Jason Wang <[email protected]>
- *
- * Based on virtio_pci_modern.c.
- */
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/vdpa.h>
- #include <linux/virtio.h>
- #include <linux/virtio_config.h>
- #include <linux/virtio_ring.h>
- #include <linux/virtio_pci.h>
- #include <linux/virtio_pci_modern.h>
- #include <uapi/linux/vdpa.h>
- #define VP_VDPA_QUEUE_MAX 256
- #define VP_VDPA_DRIVER_NAME "vp_vdpa"
- #define VP_VDPA_NAME_SIZE 256
- struct vp_vring {
- void __iomem *notify;
- char msix_name[VP_VDPA_NAME_SIZE];
- struct vdpa_callback cb;
- resource_size_t notify_pa;
- int irq;
- };
- struct vp_vdpa {
- struct vdpa_device vdpa;
- struct virtio_pci_modern_device *mdev;
- struct vp_vring *vring;
- struct vdpa_callback config_cb;
- u64 device_features;
- char msix_name[VP_VDPA_NAME_SIZE];
- int config_irq;
- int queues;
- int vectors;
- };
- struct vp_vdpa_mgmtdev {
- struct vdpa_mgmt_dev mgtdev;
- struct virtio_pci_modern_device *mdev;
- struct vp_vdpa *vp_vdpa;
- };
- static struct vp_vdpa *vdpa_to_vp(struct vdpa_device *vdpa)
- {
- return container_of(vdpa, struct vp_vdpa, vdpa);
- }
- static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- return vp_vdpa->mdev;
- }
- static struct virtio_pci_modern_device *vp_vdpa_to_mdev(struct vp_vdpa *vp_vdpa)
- {
- return vp_vdpa->mdev;
- }
- static u64 vp_vdpa_get_device_features(struct vdpa_device *vdpa)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- return vp_vdpa->device_features;
- }
- static int vp_vdpa_set_driver_features(struct vdpa_device *vdpa, u64 features)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- vp_modern_set_features(mdev, features);
- return 0;
- }
- static u64 vp_vdpa_get_driver_features(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return vp_modern_get_driver_features(mdev);
- }
- static u8 vp_vdpa_get_status(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return vp_modern_get_status(mdev);
- }
- static int vp_vdpa_get_vq_irq(struct vdpa_device *vdpa, u16 idx)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- int irq = vp_vdpa->vring[idx].irq;
- if (irq == VIRTIO_MSI_NO_VECTOR)
- return -EINVAL;
- return irq;
- }
- static void vp_vdpa_free_irq(struct vp_vdpa *vp_vdpa)
- {
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- struct pci_dev *pdev = mdev->pci_dev;
- int i;
- for (i = 0; i < vp_vdpa->queues; i++) {
- if (vp_vdpa->vring[i].irq != VIRTIO_MSI_NO_VECTOR) {
- vp_modern_queue_vector(mdev, i, VIRTIO_MSI_NO_VECTOR);
- devm_free_irq(&pdev->dev, vp_vdpa->vring[i].irq,
- &vp_vdpa->vring[i]);
- vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
- }
- }
- if (vp_vdpa->config_irq != VIRTIO_MSI_NO_VECTOR) {
- vp_modern_config_vector(mdev, VIRTIO_MSI_NO_VECTOR);
- devm_free_irq(&pdev->dev, vp_vdpa->config_irq, vp_vdpa);
- vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
- }
- if (vp_vdpa->vectors) {
- pci_free_irq_vectors(pdev);
- vp_vdpa->vectors = 0;
- }
- }
- static irqreturn_t vp_vdpa_vq_handler(int irq, void *arg)
- {
- struct vp_vring *vring = arg;
- if (vring->cb.callback)
- return vring->cb.callback(vring->cb.private);
- return IRQ_HANDLED;
- }
- static irqreturn_t vp_vdpa_config_handler(int irq, void *arg)
- {
- struct vp_vdpa *vp_vdpa = arg;
- if (vp_vdpa->config_cb.callback)
- return vp_vdpa->config_cb.callback(vp_vdpa->config_cb.private);
- return IRQ_HANDLED;
- }
- static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
- {
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- struct pci_dev *pdev = mdev->pci_dev;
- int i, ret, irq;
- int queues = vp_vdpa->queues;
- int vectors = queues + 1;
- ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
- if (ret != vectors) {
- dev_err(&pdev->dev,
- "vp_vdpa: fail to allocate irq vectors want %d but %d\n",
- vectors, ret);
- return ret;
- }
- vp_vdpa->vectors = vectors;
- for (i = 0; i < queues; i++) {
- snprintf(vp_vdpa->vring[i].msix_name, VP_VDPA_NAME_SIZE,
- "vp-vdpa[%s]-%d\n", pci_name(pdev), i);
- irq = pci_irq_vector(pdev, i);
- ret = devm_request_irq(&pdev->dev, irq,
- vp_vdpa_vq_handler,
- 0, vp_vdpa->vring[i].msix_name,
- &vp_vdpa->vring[i]);
- if (ret) {
- dev_err(&pdev->dev,
- "vp_vdpa: fail to request irq for vq %d\n", i);
- goto err;
- }
- vp_modern_queue_vector(mdev, i, i);
- vp_vdpa->vring[i].irq = irq;
- }
- snprintf(vp_vdpa->msix_name, VP_VDPA_NAME_SIZE, "vp-vdpa[%s]-config\n",
- pci_name(pdev));
- irq = pci_irq_vector(pdev, queues);
- ret = devm_request_irq(&pdev->dev, irq, vp_vdpa_config_handler, 0,
- vp_vdpa->msix_name, vp_vdpa);
- if (ret) {
- dev_err(&pdev->dev,
- "vp_vdpa: fail to request irq for vq %d\n", i);
- goto err;
- }
- vp_modern_config_vector(mdev, queues);
- vp_vdpa->config_irq = irq;
- return 0;
- err:
- vp_vdpa_free_irq(vp_vdpa);
- return ret;
- }
- static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- u8 s = vp_vdpa_get_status(vdpa);
- if (status & VIRTIO_CONFIG_S_DRIVER_OK &&
- !(s & VIRTIO_CONFIG_S_DRIVER_OK)) {
- vp_vdpa_request_irq(vp_vdpa);
- }
- vp_modern_set_status(mdev, status);
- }
- static int vp_vdpa_reset(struct vdpa_device *vdpa)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- u8 s = vp_vdpa_get_status(vdpa);
- vp_modern_set_status(mdev, 0);
- if (s & VIRTIO_CONFIG_S_DRIVER_OK)
- vp_vdpa_free_irq(vp_vdpa);
- return 0;
- }
- static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
- {
- return VP_VDPA_QUEUE_MAX;
- }
- static int vp_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid,
- struct vdpa_vq_state *state)
- {
- /* Note that this is not supported by virtio specification, so
- * we return -EOPNOTSUPP here. This means we can't support live
- * migration, vhost device start/stop.
- */
- return -EOPNOTSUPP;
- }
- static int vp_vdpa_set_vq_state_split(struct vdpa_device *vdpa,
- const struct vdpa_vq_state *state)
- {
- const struct vdpa_vq_state_split *split = &state->split;
- if (split->avail_index == 0)
- return 0;
- return -EOPNOTSUPP;
- }
- static int vp_vdpa_set_vq_state_packed(struct vdpa_device *vdpa,
- const struct vdpa_vq_state *state)
- {
- const struct vdpa_vq_state_packed *packed = &state->packed;
- if (packed->last_avail_counter == 1 &&
- packed->last_avail_idx == 0 &&
- packed->last_used_counter == 1 &&
- packed->last_used_idx == 0)
- return 0;
- return -EOPNOTSUPP;
- }
- static int vp_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid,
- const struct vdpa_vq_state *state)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- /* Note that this is not supported by virtio specification.
- * But if the state is by chance equal to the device initial
- * state, we can let it go.
- */
- if ((vp_modern_get_status(mdev) & VIRTIO_CONFIG_S_FEATURES_OK) &&
- !vp_modern_get_queue_enable(mdev, qid)) {
- if (vp_modern_get_driver_features(mdev) &
- BIT_ULL(VIRTIO_F_RING_PACKED))
- return vp_vdpa_set_vq_state_packed(vdpa, state);
- else
- return vp_vdpa_set_vq_state_split(vdpa, state);
- }
- return -EOPNOTSUPP;
- }
- static void vp_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 qid,
- struct vdpa_callback *cb)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- vp_vdpa->vring[qid].cb = *cb;
- }
- static void vp_vdpa_set_vq_ready(struct vdpa_device *vdpa,
- u16 qid, bool ready)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- vp_modern_set_queue_enable(mdev, qid, ready);
- }
- static bool vp_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 qid)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return vp_modern_get_queue_enable(mdev, qid);
- }
- static void vp_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 qid,
- u32 num)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- vp_modern_set_queue_size(mdev, qid, num);
- }
- static int vp_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 qid,
- u64 desc_area, u64 driver_area,
- u64 device_area)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- vp_modern_queue_address(mdev, qid, desc_area,
- driver_area, device_area);
- return 0;
- }
- static void vp_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- vp_iowrite16(qid, vp_vdpa->vring[qid].notify);
- }
- static u32 vp_vdpa_get_generation(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return vp_modern_generation(mdev);
- }
- static u32 vp_vdpa_get_device_id(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return mdev->id.device;
- }
- static u32 vp_vdpa_get_vendor_id(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return mdev->id.vendor;
- }
- static u32 vp_vdpa_get_vq_align(struct vdpa_device *vdpa)
- {
- return PAGE_SIZE;
- }
- static size_t vp_vdpa_get_config_size(struct vdpa_device *vdpa)
- {
- struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
- return mdev->device_len;
- }
- static void vp_vdpa_get_config(struct vdpa_device *vdpa,
- unsigned int offset,
- void *buf, unsigned int len)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- u8 old, new;
- u8 *p;
- int i;
- do {
- old = vp_ioread8(&mdev->common->config_generation);
- p = buf;
- for (i = 0; i < len; i++)
- *p++ = vp_ioread8(mdev->device + offset + i);
- new = vp_ioread8(&mdev->common->config_generation);
- } while (old != new);
- }
- static void vp_vdpa_set_config(struct vdpa_device *vdpa,
- unsigned int offset, const void *buf,
- unsigned int len)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- const u8 *p = buf;
- int i;
- for (i = 0; i < len; i++)
- vp_iowrite8(*p++, mdev->device + offset + i);
- }
- static void vp_vdpa_set_config_cb(struct vdpa_device *vdpa,
- struct vdpa_callback *cb)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- vp_vdpa->config_cb = *cb;
- }
- static struct vdpa_notification_area
- vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
- {
- struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
- struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
- struct vdpa_notification_area notify;
- notify.addr = vp_vdpa->vring[qid].notify_pa;
- notify.size = mdev->notify_offset_multiplier;
- return notify;
- }
- static const struct vdpa_config_ops vp_vdpa_ops = {
- .get_device_features = vp_vdpa_get_device_features,
- .set_driver_features = vp_vdpa_set_driver_features,
- .get_driver_features = vp_vdpa_get_driver_features,
- .get_status = vp_vdpa_get_status,
- .set_status = vp_vdpa_set_status,
- .reset = vp_vdpa_reset,
- .get_vq_num_max = vp_vdpa_get_vq_num_max,
- .get_vq_state = vp_vdpa_get_vq_state,
- .get_vq_notification = vp_vdpa_get_vq_notification,
- .set_vq_state = vp_vdpa_set_vq_state,
- .set_vq_cb = vp_vdpa_set_vq_cb,
- .set_vq_ready = vp_vdpa_set_vq_ready,
- .get_vq_ready = vp_vdpa_get_vq_ready,
- .set_vq_num = vp_vdpa_set_vq_num,
- .set_vq_address = vp_vdpa_set_vq_address,
- .kick_vq = vp_vdpa_kick_vq,
- .get_generation = vp_vdpa_get_generation,
- .get_device_id = vp_vdpa_get_device_id,
- .get_vendor_id = vp_vdpa_get_vendor_id,
- .get_vq_align = vp_vdpa_get_vq_align,
- .get_config_size = vp_vdpa_get_config_size,
- .get_config = vp_vdpa_get_config,
- .set_config = vp_vdpa_set_config,
- .set_config_cb = vp_vdpa_set_config_cb,
- .get_vq_irq = vp_vdpa_get_vq_irq,
- };
- static void vp_vdpa_free_irq_vectors(void *data)
- {
- pci_free_irq_vectors(data);
- }
- static int vp_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
- const struct vdpa_dev_set_config *add_config)
- {
- struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
- container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
- struct virtio_pci_modern_device *mdev = vp_vdpa_mgtdev->mdev;
- struct pci_dev *pdev = mdev->pci_dev;
- struct device *dev = &pdev->dev;
- struct vp_vdpa *vp_vdpa = NULL;
- u64 device_features;
- int ret, i;
- vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa,
- dev, &vp_vdpa_ops, 1, 1, name, false);
- if (IS_ERR(vp_vdpa)) {
- dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n");
- return PTR_ERR(vp_vdpa);
- }
- vp_vdpa_mgtdev->vp_vdpa = vp_vdpa;
- vp_vdpa->vdpa.dma_dev = &pdev->dev;
- vp_vdpa->queues = vp_modern_get_num_queues(mdev);
- vp_vdpa->mdev = mdev;
- device_features = vp_modern_get_features(mdev);
- if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
- if (add_config->device_features & ~device_features) {
- ret = -EINVAL;
- dev_err(&pdev->dev, "Try to provision features "
- "that are not supported by the device: "
- "device_features 0x%llx provisioned 0x%llx\n",
- device_features, add_config->device_features);
- goto err;
- }
- device_features = add_config->device_features;
- }
- vp_vdpa->device_features = device_features;
- ret = devm_add_action_or_reset(dev, vp_vdpa_free_irq_vectors, pdev);
- if (ret) {
- dev_err(&pdev->dev,
- "Failed for adding devres for freeing irq vectors\n");
- goto err;
- }
- vp_vdpa->vring = devm_kcalloc(&pdev->dev, vp_vdpa->queues,
- sizeof(*vp_vdpa->vring),
- GFP_KERNEL);
- if (!vp_vdpa->vring) {
- ret = -ENOMEM;
- dev_err(&pdev->dev, "Fail to allocate virtqueues\n");
- goto err;
- }
- for (i = 0; i < vp_vdpa->queues; i++) {
- vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR;
- vp_vdpa->vring[i].notify =
- vp_modern_map_vq_notify(mdev, i,
- &vp_vdpa->vring[i].notify_pa);
- if (!vp_vdpa->vring[i].notify) {
- ret = -EINVAL;
- dev_warn(&pdev->dev, "Fail to map vq notify %d\n", i);
- goto err;
- }
- }
- vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
- vp_vdpa->vdpa.mdev = &vp_vdpa_mgtdev->mgtdev;
- ret = _vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues);
- if (ret) {
- dev_err(&pdev->dev, "Failed to register to vdpa bus\n");
- goto err;
- }
- return 0;
- err:
- put_device(&vp_vdpa->vdpa.dev);
- return ret;
- }
- static void vp_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev,
- struct vdpa_device *dev)
- {
- struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
- container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
- struct vp_vdpa *vp_vdpa = vp_vdpa_mgtdev->vp_vdpa;
- _vdpa_unregister_device(&vp_vdpa->vdpa);
- vp_vdpa_mgtdev->vp_vdpa = NULL;
- }
- static const struct vdpa_mgmtdev_ops vp_vdpa_mdev_ops = {
- .dev_add = vp_vdpa_dev_add,
- .dev_del = vp_vdpa_dev_del,
- };
- static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
- {
- struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = NULL;
- struct vdpa_mgmt_dev *mgtdev;
- struct device *dev = &pdev->dev;
- struct virtio_pci_modern_device *mdev = NULL;
- struct virtio_device_id *mdev_id = NULL;
- int err;
- vp_vdpa_mgtdev = kzalloc(sizeof(*vp_vdpa_mgtdev), GFP_KERNEL);
- if (!vp_vdpa_mgtdev)
- return -ENOMEM;
- mgtdev = &vp_vdpa_mgtdev->mgtdev;
- mgtdev->ops = &vp_vdpa_mdev_ops;
- mgtdev->device = dev;
- mdev = kzalloc(sizeof(struct virtio_pci_modern_device), GFP_KERNEL);
- if (!mdev) {
- err = -ENOMEM;
- goto mdev_err;
- }
- mdev_id = kzalloc(sizeof(struct virtio_device_id), GFP_KERNEL);
- if (!mdev_id) {
- err = -ENOMEM;
- goto mdev_id_err;
- }
- vp_vdpa_mgtdev->mdev = mdev;
- mdev->pci_dev = pdev;
- err = pcim_enable_device(pdev);
- if (err) {
- goto probe_err;
- }
- err = vp_modern_probe(mdev);
- if (err) {
- dev_err(&pdev->dev, "Failed to probe modern PCI device\n");
- goto probe_err;
- }
- mdev_id->device = mdev->id.device;
- mdev_id->vendor = mdev->id.vendor;
- mgtdev->id_table = mdev_id;
- mgtdev->max_supported_vqs = vp_modern_get_num_queues(mdev);
- mgtdev->supported_features = vp_modern_get_features(mdev);
- mgtdev->config_attr_mask = (1 << VDPA_ATTR_DEV_FEATURES);
- pci_set_master(pdev);
- pci_set_drvdata(pdev, vp_vdpa_mgtdev);
- err = vdpa_mgmtdev_register(mgtdev);
- if (err) {
- dev_err(&pdev->dev, "Failed to register vdpa mgmtdev device\n");
- goto register_err;
- }
- return 0;
- register_err:
- vp_modern_remove(vp_vdpa_mgtdev->mdev);
- probe_err:
- kfree(mdev_id);
- mdev_id_err:
- kfree(mdev);
- mdev_err:
- kfree(vp_vdpa_mgtdev);
- return err;
- }
- static void vp_vdpa_remove(struct pci_dev *pdev)
- {
- struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = pci_get_drvdata(pdev);
- struct virtio_pci_modern_device *mdev = NULL;
- mdev = vp_vdpa_mgtdev->mdev;
- vdpa_mgmtdev_unregister(&vp_vdpa_mgtdev->mgtdev);
- vp_modern_remove(mdev);
- kfree(vp_vdpa_mgtdev->mgtdev.id_table);
- kfree(mdev);
- kfree(vp_vdpa_mgtdev);
- }
- static struct pci_driver vp_vdpa_driver = {
- .name = "vp-vdpa",
- .id_table = NULL, /* only dynamic ids */
- .probe = vp_vdpa_probe,
- .remove = vp_vdpa_remove,
- };
- module_pci_driver(vp_vdpa_driver);
- MODULE_AUTHOR("Jason Wang <[email protected]>");
- MODULE_DESCRIPTION("vp-vdpa");
- MODULE_LICENSE("GPL");
- MODULE_VERSION("1");
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