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drivers/virtio/virtio_vdpa.c
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// SPDX-License-Identifier: GPL-2.0-only /* * VIRTIO based driver for vDPA device * * Copyright (c) 2020, Red Hat. All rights reserved. * Author: Jason Wang <jasowang@redhat.com> * */ #include <linux/init.h> #include <linux/module.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/uuid.h> #include <linux/virtio.h> #include <linux/vdpa.h> #include <linux/virtio_config.h> #include <linux/virtio_ring.h> #define MOD_VERSION "0.1" #define MOD_AUTHOR "Jason Wang <jasowang@redhat.com>" #define MOD_DESC "vDPA bus driver for virtio devices" #define MOD_LICENSE "GPL v2" struct virtio_vdpa_device { struct virtio_device vdev; struct vdpa_device *vdpa; u64 features; /* The lock to protect virtqueue list */ spinlock_t lock; /* List of virtio_vdpa_vq_info */ struct list_head virtqueues; }; struct virtio_vdpa_vq_info { /* the actual virtqueue */ struct virtqueue *vq; /* the list node for the virtqueues list */ struct list_head node; }; static inline struct virtio_vdpa_device * to_virtio_vdpa_device(struct virtio_device *dev) { return container_of(dev, struct virtio_vdpa_device, vdev); } static struct vdpa_device *vd_get_vdpa(struct virtio_device *vdev) { return to_virtio_vdpa_device(vdev)->vdpa; } static void virtio_vdpa_get(struct virtio_device *vdev, unsigned offset, void *buf, unsigned len) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); |
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vdpa_get_config(vdpa, offset, buf, len); |
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} static void virtio_vdpa_set(struct virtio_device *vdev, unsigned offset, const void *buf, unsigned len) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; ops->set_config(vdpa, offset, buf, len); } static u32 virtio_vdpa_generation(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; if (ops->get_generation) return ops->get_generation(vdpa); return 0; } static u8 virtio_vdpa_get_status(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; return ops->get_status(vdpa); } static void virtio_vdpa_set_status(struct virtio_device *vdev, u8 status) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; return ops->set_status(vdpa, status); } static void virtio_vdpa_reset(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); |
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vdpa_reset(vdpa); |
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} static bool virtio_vdpa_notify(struct virtqueue *vq) { struct vdpa_device *vdpa = vd_get_vdpa(vq->vdev); const struct vdpa_config_ops *ops = vdpa->config; ops->kick_vq(vdpa, vq->index); return true; } static irqreturn_t virtio_vdpa_config_cb(void *private) { struct virtio_vdpa_device *vd_dev = private; virtio_config_changed(&vd_dev->vdev); return IRQ_HANDLED; } static irqreturn_t virtio_vdpa_virtqueue_cb(void *private) { struct virtio_vdpa_vq_info *info = private; return vring_interrupt(0, info->vq); } static struct virtqueue * virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, void (*callback)(struct virtqueue *vq), const char *name, bool ctx) { struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev); struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; struct virtio_vdpa_vq_info *info; struct vdpa_callback cb; struct virtqueue *vq; u64 desc_addr, driver_addr, device_addr; unsigned long flags; u32 align, num; int err; if (!name) return NULL; /* Queue shouldn't already be set up. */ if (ops->get_vq_ready(vdpa, index)) return ERR_PTR(-ENOENT); /* Allocate and fill out our active queue description */ info = kmalloc(sizeof(*info), GFP_KERNEL); if (!info) return ERR_PTR(-ENOMEM); num = ops->get_vq_num_max(vdpa); if (num == 0) { err = -ENOENT; goto error_new_virtqueue; } /* Create the vring */ align = ops->get_vq_align(vdpa); vq = vring_create_virtqueue(index, num, align, vdev, true, true, ctx, virtio_vdpa_notify, callback, name); if (!vq) { err = -ENOMEM; goto error_new_virtqueue; } /* Setup virtqueue callback */ cb.callback = virtio_vdpa_virtqueue_cb; cb.private = info; ops->set_vq_cb(vdpa, index, &cb); ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq)); desc_addr = virtqueue_get_desc_addr(vq); driver_addr = virtqueue_get_avail_addr(vq); device_addr = virtqueue_get_used_addr(vq); if (ops->set_vq_address(vdpa, index, desc_addr, driver_addr, device_addr)) { err = -EINVAL; goto err_vq; } ops->set_vq_ready(vdpa, index, 1); vq->priv = info; info->vq = vq; spin_lock_irqsave(&vd_dev->lock, flags); list_add(&info->node, &vd_dev->virtqueues); spin_unlock_irqrestore(&vd_dev->lock, flags); return vq; err_vq: vring_del_virtqueue(vq); error_new_virtqueue: ops->set_vq_ready(vdpa, index, 0); /* VDPA driver should make sure vq is stopeed here */ WARN_ON(ops->get_vq_ready(vdpa, index)); kfree(info); return ERR_PTR(err); } static void virtio_vdpa_del_vq(struct virtqueue *vq) { struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev); struct vdpa_device *vdpa = vd_dev->vdpa; const struct vdpa_config_ops *ops = vdpa->config; struct virtio_vdpa_vq_info *info = vq->priv; unsigned int index = vq->index; unsigned long flags; spin_lock_irqsave(&vd_dev->lock, flags); list_del(&info->node); spin_unlock_irqrestore(&vd_dev->lock, flags); /* Select and deactivate the queue */ ops->set_vq_ready(vdpa, index, 0); WARN_ON(ops->get_vq_ready(vdpa, index)); vring_del_virtqueue(vq); kfree(info); } static void virtio_vdpa_del_vqs(struct virtio_device *vdev) { struct virtqueue *vq, *n; list_for_each_entry_safe(vq, n, &vdev->vqs, list) virtio_vdpa_del_vq(vq); } static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned nvqs, struct virtqueue *vqs[], vq_callback_t *callbacks[], const char * const names[], const bool *ctx, struct irq_affinity *desc) { struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev); struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; struct vdpa_callback cb; int i, err, queue_idx = 0; for (i = 0; i < nvqs; ++i) { if (!names[i]) { vqs[i] = NULL; continue; } vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false); if (IS_ERR(vqs[i])) { err = PTR_ERR(vqs[i]); goto err_setup_vq; } } cb.callback = virtio_vdpa_config_cb; cb.private = vd_dev; ops->set_config_cb(vdpa, &cb); return 0; err_setup_vq: virtio_vdpa_del_vqs(vdev); return err; } static u64 virtio_vdpa_get_features(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); const struct vdpa_config_ops *ops = vdpa->config; return ops->get_features(vdpa); } static int virtio_vdpa_finalize_features(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); |
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/* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); |
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return vdpa_set_features(vdpa, vdev->features); |
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} static const char *virtio_vdpa_bus_name(struct virtio_device *vdev) { struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev); struct vdpa_device *vdpa = vd_dev->vdpa; return dev_name(&vdpa->dev); } static const struct virtio_config_ops virtio_vdpa_config_ops = { .get = virtio_vdpa_get, .set = virtio_vdpa_set, .generation = virtio_vdpa_generation, .get_status = virtio_vdpa_get_status, .set_status = virtio_vdpa_set_status, .reset = virtio_vdpa_reset, .find_vqs = virtio_vdpa_find_vqs, .del_vqs = virtio_vdpa_del_vqs, .get_features = virtio_vdpa_get_features, .finalize_features = virtio_vdpa_finalize_features, .bus_name = virtio_vdpa_bus_name, }; static void virtio_vdpa_release_dev(struct device *_d) { struct virtio_device *vdev = container_of(_d, struct virtio_device, dev); struct virtio_vdpa_device *vd_dev = container_of(vdev, struct virtio_vdpa_device, vdev); kfree(vd_dev); } static int virtio_vdpa_probe(struct vdpa_device *vdpa) { const struct vdpa_config_ops *ops = vdpa->config; struct virtio_vdpa_device *vd_dev, *reg_dev = NULL; int ret = -EINVAL; vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL); if (!vd_dev) return -ENOMEM; vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa); vd_dev->vdev.dev.release = virtio_vdpa_release_dev; vd_dev->vdev.config = &virtio_vdpa_config_ops; vd_dev->vdpa = vdpa; INIT_LIST_HEAD(&vd_dev->virtqueues); spin_lock_init(&vd_dev->lock); vd_dev->vdev.id.device = ops->get_device_id(vdpa); if (vd_dev->vdev.id.device == 0) goto err; vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa); ret = register_virtio_device(&vd_dev->vdev); reg_dev = vd_dev; if (ret) goto err; vdpa_set_drvdata(vdpa, vd_dev); return 0; err: if (reg_dev) put_device(&vd_dev->vdev.dev); else kfree(vd_dev); return ret; } static void virtio_vdpa_remove(struct vdpa_device *vdpa) { struct virtio_vdpa_device *vd_dev = vdpa_get_drvdata(vdpa); unregister_virtio_device(&vd_dev->vdev); } static struct vdpa_driver virtio_vdpa_driver = { .driver = { .name = "virtio_vdpa", }, .probe = virtio_vdpa_probe, .remove = virtio_vdpa_remove, }; module_vdpa_driver(virtio_vdpa_driver); MODULE_VERSION(MOD_VERSION); MODULE_LICENSE(MOD_LICENSE); MODULE_AUTHOR(MOD_AUTHOR); MODULE_DESCRIPTION(MOD_DESC); |