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https://github.com/AsahiLinux/u-boot
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This driver provides support for Sandbox implementation of virtio transport driver which is used for testing purpose only. Two drivers are provided. The 2nd one is a driver that lacks the 'notify' op. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
233 lines
5.3 KiB
C
233 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* VirtIO Sandbox transport driver, for testing purpose only
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*/
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#include <common.h>
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#include <dm.h>
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#include <virtio_types.h>
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#include <virtio.h>
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#include <virtio_ring.h>
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#include <linux/compat.h>
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#include <linux/io.h>
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struct virtio_sandbox_priv {
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u8 id;
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u8 status;
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u64 device_features;
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u64 driver_features;
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ulong queue_desc;
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ulong queue_available;
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ulong queue_used;
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};
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static int virtio_sandbox_get_config(struct udevice *udev, unsigned int offset,
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void *buf, unsigned int len)
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{
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return 0;
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}
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static int virtio_sandbox_set_config(struct udevice *udev, unsigned int offset,
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const void *buf, unsigned int len)
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{
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return 0;
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}
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static int virtio_sandbox_get_status(struct udevice *udev, u8 *status)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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*status = priv->status;
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return 0;
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}
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static int virtio_sandbox_set_status(struct udevice *udev, u8 status)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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/* We should never be setting status to 0 */
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WARN_ON(status == 0);
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priv->status = status;
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return 0;
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}
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static int virtio_sandbox_reset(struct udevice *udev)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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/* 0 status means a reset */
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priv->status = 0;
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return 0;
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}
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static int virtio_sandbox_get_features(struct udevice *udev, u64 *features)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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*features = priv->device_features;
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return 0;
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}
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static int virtio_sandbox_set_features(struct udevice *udev)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
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priv->driver_features = uc_priv->features;
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return 0;
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}
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static struct virtqueue *virtio_sandbox_setup_vq(struct udevice *udev,
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unsigned int index)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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struct virtqueue *vq;
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ulong addr;
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int err;
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/* Create the vring */
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vq = vring_create_virtqueue(index, 4, 4096, udev);
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if (!vq) {
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err = -ENOMEM;
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goto error_new_virtqueue;
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}
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addr = virtqueue_get_desc_addr(vq);
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priv->queue_desc = addr;
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addr = virtqueue_get_avail_addr(vq);
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priv->queue_available = addr;
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addr = virtqueue_get_used_addr(vq);
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priv->queue_used = addr;
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return vq;
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error_new_virtqueue:
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return ERR_PTR(err);
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}
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static void virtio_sandbox_del_vq(struct virtqueue *vq)
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{
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vring_del_virtqueue(vq);
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}
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static int virtio_sandbox_del_vqs(struct udevice *udev)
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{
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
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struct virtqueue *vq, *n;
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list_for_each_entry_safe(vq, n, &uc_priv->vqs, list)
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virtio_sandbox_del_vq(vq);
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return 0;
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}
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static int virtio_sandbox_find_vqs(struct udevice *udev, unsigned int nvqs,
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struct virtqueue *vqs[])
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{
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int i;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = virtio_sandbox_setup_vq(udev, i);
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if (IS_ERR(vqs[i])) {
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virtio_sandbox_del_vqs(udev);
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return PTR_ERR(vqs[i]);
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}
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}
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return 0;
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}
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static int virtio_sandbox_notify(struct udevice *udev, struct virtqueue *vq)
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{
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return 0;
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}
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static int virtio_sandbox_probe(struct udevice *udev)
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{
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struct virtio_sandbox_priv *priv = dev_get_priv(udev);
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
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/* fake some information for testing */
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priv->device_features = VIRTIO_F_VERSION_1;
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uc_priv->device = VIRTIO_ID_BLOCK;
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uc_priv->vendor = ('u' << 24) | ('b' << 16) | ('o' << 8) | 't';
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return 0;
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}
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/* check virtio device driver's remove routine was called to reset the device */
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static int virtio_sandbox_child_post_remove(struct udevice *vdev)
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{
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u8 status;
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virtio_get_status(vdev, &status);
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if (status)
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panic("virtio device was not reset\n");
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return 0;
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}
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static const struct dm_virtio_ops virtio_sandbox1_ops = {
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.get_config = virtio_sandbox_get_config,
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.set_config = virtio_sandbox_set_config,
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.get_status = virtio_sandbox_get_status,
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.set_status = virtio_sandbox_set_status,
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.reset = virtio_sandbox_reset,
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.get_features = virtio_sandbox_get_features,
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.set_features = virtio_sandbox_set_features,
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.find_vqs = virtio_sandbox_find_vqs,
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.del_vqs = virtio_sandbox_del_vqs,
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.notify = virtio_sandbox_notify,
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};
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static const struct udevice_id virtio_sandbox1_ids[] = {
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{ .compatible = "sandbox,virtio1" },
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{ }
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};
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U_BOOT_DRIVER(virtio_sandbox1) = {
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.name = "virtio-sandbox1",
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.id = UCLASS_VIRTIO,
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.of_match = virtio_sandbox1_ids,
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.ops = &virtio_sandbox1_ops,
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.probe = virtio_sandbox_probe,
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.child_post_remove = virtio_sandbox_child_post_remove,
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.priv_auto_alloc_size = sizeof(struct virtio_sandbox_priv),
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};
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/* this one without notify op */
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static const struct dm_virtio_ops virtio_sandbox2_ops = {
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.get_config = virtio_sandbox_get_config,
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.set_config = virtio_sandbox_set_config,
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.get_status = virtio_sandbox_get_status,
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.set_status = virtio_sandbox_set_status,
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.reset = virtio_sandbox_reset,
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.get_features = virtio_sandbox_get_features,
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.set_features = virtio_sandbox_set_features,
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.find_vqs = virtio_sandbox_find_vqs,
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.del_vqs = virtio_sandbox_del_vqs,
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};
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static const struct udevice_id virtio_sandbox2_ids[] = {
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{ .compatible = "sandbox,virtio2" },
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{ }
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};
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U_BOOT_DRIVER(virtio_sandbox2) = {
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.name = "virtio-sandbox2",
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.id = UCLASS_VIRTIO,
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.of_match = virtio_sandbox2_ids,
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.ops = &virtio_sandbox2_ops,
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.probe = virtio_sandbox_probe,
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.priv_auto_alloc_size = sizeof(struct virtio_sandbox_priv),
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};
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