Bin Meng | 51a2e0e | 2018-10-15 02:21:25 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> |
| 4 | * |
| 5 | * VirtIO Sandbox transport driver, for testing purpose only |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <dm.h> |
| 10 | #include <virtio_types.h> |
| 11 | #include <virtio.h> |
| 12 | #include <virtio_ring.h> |
Simon Glass | c06c1be | 2020-05-10 11:40:08 -0600 | [diff] [blame] | 13 | #include <linux/bug.h> |
Bin Meng | 51a2e0e | 2018-10-15 02:21:25 -0700 | [diff] [blame] | 14 | #include <linux/compat.h> |
Simon Glass | d66c5f7 | 2020-02-03 07:36:15 -0700 | [diff] [blame] | 15 | #include <linux/err.h> |
Bin Meng | 51a2e0e | 2018-10-15 02:21:25 -0700 | [diff] [blame] | 16 | #include <linux/io.h> |
| 17 | |
| 18 | struct virtio_sandbox_priv { |
| 19 | u8 id; |
| 20 | u8 status; |
| 21 | u64 device_features; |
| 22 | u64 driver_features; |
| 23 | ulong queue_desc; |
| 24 | ulong queue_available; |
| 25 | ulong queue_used; |
| 26 | }; |
| 27 | |
| 28 | static int virtio_sandbox_get_config(struct udevice *udev, unsigned int offset, |
| 29 | void *buf, unsigned int len) |
| 30 | { |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | static int virtio_sandbox_set_config(struct udevice *udev, unsigned int offset, |
| 35 | const void *buf, unsigned int len) |
| 36 | { |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static int virtio_sandbox_get_status(struct udevice *udev, u8 *status) |
| 41 | { |
| 42 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 43 | |
| 44 | *status = priv->status; |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static int virtio_sandbox_set_status(struct udevice *udev, u8 status) |
| 50 | { |
| 51 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 52 | |
| 53 | /* We should never be setting status to 0 */ |
| 54 | WARN_ON(status == 0); |
| 55 | |
| 56 | priv->status = status; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static int virtio_sandbox_reset(struct udevice *udev) |
| 62 | { |
| 63 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 64 | |
| 65 | /* 0 status means a reset */ |
| 66 | priv->status = 0; |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int virtio_sandbox_get_features(struct udevice *udev, u64 *features) |
| 72 | { |
| 73 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 74 | |
| 75 | *features = priv->device_features; |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int virtio_sandbox_set_features(struct udevice *udev) |
| 81 | { |
| 82 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 83 | struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev); |
| 84 | |
| 85 | priv->driver_features = uc_priv->features; |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static struct virtqueue *virtio_sandbox_setup_vq(struct udevice *udev, |
| 91 | unsigned int index) |
| 92 | { |
| 93 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 94 | struct virtqueue *vq; |
| 95 | ulong addr; |
| 96 | int err; |
| 97 | |
| 98 | /* Create the vring */ |
| 99 | vq = vring_create_virtqueue(index, 4, 4096, udev); |
| 100 | if (!vq) { |
| 101 | err = -ENOMEM; |
| 102 | goto error_new_virtqueue; |
| 103 | } |
| 104 | |
| 105 | addr = virtqueue_get_desc_addr(vq); |
| 106 | priv->queue_desc = addr; |
| 107 | |
| 108 | addr = virtqueue_get_avail_addr(vq); |
| 109 | priv->queue_available = addr; |
| 110 | |
| 111 | addr = virtqueue_get_used_addr(vq); |
| 112 | priv->queue_used = addr; |
| 113 | |
| 114 | return vq; |
| 115 | |
| 116 | error_new_virtqueue: |
| 117 | return ERR_PTR(err); |
| 118 | } |
| 119 | |
| 120 | static void virtio_sandbox_del_vq(struct virtqueue *vq) |
| 121 | { |
| 122 | vring_del_virtqueue(vq); |
| 123 | } |
| 124 | |
| 125 | static int virtio_sandbox_del_vqs(struct udevice *udev) |
| 126 | { |
| 127 | struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev); |
| 128 | struct virtqueue *vq, *n; |
| 129 | |
| 130 | list_for_each_entry_safe(vq, n, &uc_priv->vqs, list) |
| 131 | virtio_sandbox_del_vq(vq); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static int virtio_sandbox_find_vqs(struct udevice *udev, unsigned int nvqs, |
| 137 | struct virtqueue *vqs[]) |
| 138 | { |
| 139 | int i; |
| 140 | |
| 141 | for (i = 0; i < nvqs; ++i) { |
| 142 | vqs[i] = virtio_sandbox_setup_vq(udev, i); |
| 143 | if (IS_ERR(vqs[i])) { |
| 144 | virtio_sandbox_del_vqs(udev); |
| 145 | return PTR_ERR(vqs[i]); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static int virtio_sandbox_notify(struct udevice *udev, struct virtqueue *vq) |
| 153 | { |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int virtio_sandbox_probe(struct udevice *udev) |
| 158 | { |
| 159 | struct virtio_sandbox_priv *priv = dev_get_priv(udev); |
| 160 | struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev); |
| 161 | |
| 162 | /* fake some information for testing */ |
| 163 | priv->device_features = VIRTIO_F_VERSION_1; |
| 164 | uc_priv->device = VIRTIO_ID_BLOCK; |
| 165 | uc_priv->vendor = ('u' << 24) | ('b' << 16) | ('o' << 8) | 't'; |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /* check virtio device driver's remove routine was called to reset the device */ |
| 171 | static int virtio_sandbox_child_post_remove(struct udevice *vdev) |
| 172 | { |
| 173 | u8 status; |
| 174 | |
| 175 | virtio_get_status(vdev, &status); |
| 176 | if (status) |
| 177 | panic("virtio device was not reset\n"); |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static const struct dm_virtio_ops virtio_sandbox1_ops = { |
| 183 | .get_config = virtio_sandbox_get_config, |
| 184 | .set_config = virtio_sandbox_set_config, |
| 185 | .get_status = virtio_sandbox_get_status, |
| 186 | .set_status = virtio_sandbox_set_status, |
| 187 | .reset = virtio_sandbox_reset, |
| 188 | .get_features = virtio_sandbox_get_features, |
| 189 | .set_features = virtio_sandbox_set_features, |
| 190 | .find_vqs = virtio_sandbox_find_vqs, |
| 191 | .del_vqs = virtio_sandbox_del_vqs, |
| 192 | .notify = virtio_sandbox_notify, |
| 193 | }; |
| 194 | |
| 195 | static const struct udevice_id virtio_sandbox1_ids[] = { |
| 196 | { .compatible = "sandbox,virtio1" }, |
| 197 | { } |
| 198 | }; |
| 199 | |
| 200 | U_BOOT_DRIVER(virtio_sandbox1) = { |
| 201 | .name = "virtio-sandbox1", |
| 202 | .id = UCLASS_VIRTIO, |
| 203 | .of_match = virtio_sandbox1_ids, |
| 204 | .ops = &virtio_sandbox1_ops, |
| 205 | .probe = virtio_sandbox_probe, |
| 206 | .child_post_remove = virtio_sandbox_child_post_remove, |
| 207 | .priv_auto_alloc_size = sizeof(struct virtio_sandbox_priv), |
| 208 | }; |
| 209 | |
| 210 | /* this one without notify op */ |
| 211 | static const struct dm_virtio_ops virtio_sandbox2_ops = { |
| 212 | .get_config = virtio_sandbox_get_config, |
| 213 | .set_config = virtio_sandbox_set_config, |
| 214 | .get_status = virtio_sandbox_get_status, |
| 215 | .set_status = virtio_sandbox_set_status, |
| 216 | .reset = virtio_sandbox_reset, |
| 217 | .get_features = virtio_sandbox_get_features, |
| 218 | .set_features = virtio_sandbox_set_features, |
| 219 | .find_vqs = virtio_sandbox_find_vqs, |
| 220 | .del_vqs = virtio_sandbox_del_vqs, |
| 221 | }; |
| 222 | |
| 223 | static const struct udevice_id virtio_sandbox2_ids[] = { |
| 224 | { .compatible = "sandbox,virtio2" }, |
| 225 | { } |
| 226 | }; |
| 227 | |
| 228 | U_BOOT_DRIVER(virtio_sandbox2) = { |
| 229 | .name = "virtio-sandbox2", |
| 230 | .id = UCLASS_VIRTIO, |
| 231 | .of_match = virtio_sandbox2_ids, |
| 232 | .ops = &virtio_sandbox2_ops, |
| 233 | .probe = virtio_sandbox_probe, |
| 234 | .priv_auto_alloc_size = sizeof(struct virtio_sandbox_priv), |
| 235 | }; |