Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) COPYRIGHT 2020 ARM Limited. All rights reserved. |
| 3 | * |
| 4 | * This program is free software and is provided to you under the terms of the |
| 5 | * GNU General Public License version 2 as published by the Free Software |
| 6 | * Foundation, and any use by you of this program is subject to the terms |
| 7 | * of such GNU licence. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, you can access it online at |
| 16 | * http://www.gnu.org/licenses/gpl-2.0.html. |
| 17 | * |
| 18 | * SPDX-License-Identifier: GPL-2.0-only |
| 19 | */ |
| 20 | |
| 21 | /**************************************************************************** |
| 22 | * Includes |
| 23 | ****************************************************************************/ |
| 24 | |
| 25 | #include "ethosu_device.h" |
| 26 | |
| 27 | #include "ethosu_buffer.h" |
| 28 | #include "ethosu_core_interface.h" |
| 29 | #include "ethosu_inference.h" |
| 30 | #include "ethosu_network.h" |
| 31 | #include "uapi/ethosu.h" |
| 32 | |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/dma-mapping.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/io.h> |
| 39 | #include <linux/of_reserved_mem.h> |
| 40 | #include <linux/uaccess.h> |
| 41 | |
| 42 | /**************************************************************************** |
| 43 | * Defines |
| 44 | ****************************************************************************/ |
| 45 | |
| 46 | #define MINOR_VERSION 0 /* Minor version starts at 0 */ |
| 47 | #define MINOR_COUNT 1 /* Allocate 1 minor version */ |
| 48 | #define DMA_ADDR_BITS 32 /* Number of address bits */ |
| 49 | |
| 50 | /**************************************************************************** |
| 51 | * Types |
| 52 | ****************************************************************************/ |
| 53 | |
| 54 | /**************************************************************************** |
| 55 | * Functions |
| 56 | ****************************************************************************/ |
| 57 | |
| 58 | static int ethosu_handle_msg(struct ethosu_device *edev) |
| 59 | { |
| 60 | struct ethosu_core_msg header; |
| 61 | |
| 62 | union { |
| 63 | struct ethosu_core_inference_rsp inf; |
| 64 | } data; |
| 65 | int ret; |
| 66 | |
| 67 | /* Read message */ |
| 68 | ret = ethosu_mailbox_read(&edev->mailbox, &header, &data, sizeof(data)); |
| 69 | if (ret) |
| 70 | return ret; |
| 71 | |
| 72 | switch (header.type) { |
| 73 | case ETHOSU_CORE_MSG_PING: |
| 74 | dev_info(edev->dev, "Msg: Ping\n"); |
| 75 | ret = ethosu_mailbox_ping(&edev->mailbox); |
| 76 | break; |
| 77 | case ETHOSU_CORE_MSG_PONG: |
| 78 | dev_info(edev->dev, "Msg: Pong\n"); |
| 79 | break; |
| 80 | case ETHOSU_CORE_MSG_INFERENCE_RSP: |
| 81 | dev_info(edev->dev, |
| 82 | "Msg: Inference response. user_arg=0x%llx, ofm_size=%u, status=%u\n", |
| 83 | data.inf.user_arg, data.inf.ofm_size, |
| 84 | data.inf.status); |
| 85 | ethosu_inference_rsp(edev, &data.inf); |
| 86 | break; |
| 87 | default: |
| 88 | dev_warn(edev->dev, |
| 89 | "Msg: Unsupported msg type. type=%u, length=%u", |
| 90 | header.type, header.length); |
| 91 | break; |
| 92 | } |
| 93 | |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | static int ethosu_open(struct inode *inode, |
| 98 | struct file *file) |
| 99 | { |
| 100 | struct ethosu_device *edev = |
| 101 | container_of(inode->i_cdev, struct ethosu_device, cdev); |
| 102 | |
| 103 | file->private_data = edev; |
| 104 | |
| 105 | dev_info(edev->dev, "Opening device node.\n"); |
| 106 | |
| 107 | return nonseekable_open(inode, file); |
| 108 | } |
| 109 | |
| 110 | static long ethosu_ioctl(struct file *file, |
| 111 | unsigned int cmd, |
| 112 | unsigned long arg) |
| 113 | { |
| 114 | struct ethosu_device *edev = file->private_data; |
| 115 | void __user *udata = (void __user *)arg; |
| 116 | int ret = -EINVAL; |
| 117 | |
| 118 | ret = mutex_lock_interruptible(&edev->mutex); |
| 119 | if (ret) |
| 120 | return ret; |
| 121 | |
| 122 | dev_info(edev->dev, "Ioctl. cmd=%u, arg=%lu\n", cmd, arg); |
| 123 | |
| 124 | switch (cmd) { |
| 125 | case ETHOSU_IOCTL_PING: { |
| 126 | dev_info(edev->dev, "Ioctl: Send ping\n"); |
| 127 | ret = ethosu_mailbox_ping(&edev->mailbox); |
| 128 | break; |
| 129 | } |
| 130 | case ETHOSU_IOCTL_BUFFER_CREATE: { |
| 131 | struct ethosu_uapi_buffer_create uapi; |
| 132 | |
| 133 | dev_info(edev->dev, "Ioctl: Buffer create\n"); |
| 134 | |
| 135 | if (copy_from_user(&uapi, udata, sizeof(uapi))) |
| 136 | break; |
| 137 | |
| 138 | dev_info(edev->dev, "Ioctl: Buffer. capacity=%u\n", |
| 139 | uapi.capacity); |
| 140 | |
| 141 | ret = ethosu_buffer_create(edev, uapi.capacity); |
| 142 | break; |
| 143 | } |
| 144 | case ETHOSU_IOCTL_NETWORK_CREATE: { |
| 145 | struct ethosu_uapi_network_create uapi; |
| 146 | |
| 147 | if (copy_from_user(&uapi, udata, sizeof(uapi))) |
| 148 | break; |
| 149 | |
| 150 | dev_info(edev->dev, "Ioctl: Network. fd=%u\n", uapi.fd); |
| 151 | |
| 152 | ret = ethosu_network_create(edev, &uapi); |
| 153 | break; |
| 154 | } |
| 155 | default: { |
| 156 | dev_err(edev->dev, "Invalid ioctl. cmd=%u, arg=%lu", |
| 157 | cmd, arg); |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | mutex_unlock(&edev->mutex); |
| 163 | |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | static void ethosu_mbox_rx(void *user_arg) |
| 168 | { |
| 169 | struct ethosu_device *edev = user_arg; |
| 170 | int ret; |
| 171 | |
| 172 | mutex_lock(&edev->mutex); |
| 173 | |
| 174 | do { |
| 175 | ret = ethosu_handle_msg(edev); |
| 176 | } while (ret == 0); |
| 177 | |
| 178 | mutex_unlock(&edev->mutex); |
| 179 | } |
| 180 | |
| 181 | int ethosu_dev_init(struct ethosu_device *edev, |
| 182 | struct device *dev, |
| 183 | struct class *class, |
| 184 | struct resource *in_queue, |
| 185 | struct resource *out_queue) |
| 186 | { |
| 187 | static const struct file_operations fops = { |
| 188 | .owner = THIS_MODULE, |
| 189 | .open = ðosu_open, |
| 190 | .unlocked_ioctl = ðosu_ioctl, |
| 191 | #ifdef CONFIG_COMPAT |
| 192 | .compat_ioctl = ðosu_ioctl, |
| 193 | #endif |
| 194 | }; |
| 195 | struct device *sysdev; |
| 196 | int ret; |
| 197 | |
| 198 | edev->dev = dev; |
| 199 | edev->class = class; |
| 200 | mutex_init(&edev->mutex); |
| 201 | INIT_LIST_HEAD(&edev->inference_list); |
| 202 | |
| 203 | ret = of_reserved_mem_device_init(edev->dev); |
| 204 | if (ret) |
| 205 | return ret; |
| 206 | |
| 207 | dma_set_mask_and_coherent(edev->dev, DMA_BIT_MASK(DMA_ADDR_BITS)); |
| 208 | |
| 209 | ret = ethosu_mailbox_init(&edev->mailbox, dev, in_queue, out_queue, |
| 210 | ethosu_mbox_rx, edev); |
| 211 | if (ret) |
| 212 | goto release_reserved_mem; |
| 213 | |
| 214 | ret = alloc_chrdev_region(&edev->devt, MINOR_VERSION, MINOR_COUNT, |
| 215 | "ethosu"); |
| 216 | if (ret) { |
| 217 | dev_err(edev->dev, "Failed to allocate chrdev region.\n"); |
| 218 | goto deinit_mailbox; |
| 219 | } |
| 220 | |
| 221 | cdev_init(&edev->cdev, &fops); |
| 222 | edev->cdev.owner = THIS_MODULE; |
| 223 | |
| 224 | ret = cdev_add(&edev->cdev, edev->devt, MINOR_COUNT); |
| 225 | if (ret) { |
| 226 | dev_err(edev->dev, "Failed to add character device.\n"); |
| 227 | goto region_unregister; |
| 228 | } |
| 229 | |
| 230 | sysdev = device_create(edev->class, NULL, edev->devt, edev, |
| 231 | "ethosu%d", MAJOR(edev->devt)); |
| 232 | if (IS_ERR(sysdev)) { |
| 233 | dev_err(edev->dev, "Failed to create device.\n"); |
| 234 | ret = PTR_ERR(sysdev); |
| 235 | goto del_cdev; |
| 236 | } |
| 237 | |
| 238 | dev_info(edev->dev, |
| 239 | "Created Arm Ethos-U device. name=%s, major=%d, minor=%d\n", |
| 240 | dev_name(sysdev), MAJOR(edev->devt), MINOR(edev->devt)); |
| 241 | |
| 242 | return 0; |
| 243 | |
| 244 | del_cdev: |
| 245 | cdev_del(&edev->cdev); |
| 246 | |
| 247 | region_unregister: |
| 248 | unregister_chrdev_region(edev->devt, 1); |
| 249 | |
| 250 | deinit_mailbox: |
| 251 | ethosu_mailbox_deinit(&edev->mailbox); |
| 252 | |
| 253 | release_reserved_mem: |
| 254 | of_reserved_mem_device_release(edev->dev); |
| 255 | |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | void ethosu_dev_deinit(struct ethosu_device *edev) |
| 260 | { |
| 261 | ethosu_mailbox_deinit(&edev->mailbox); |
| 262 | device_destroy(edev->class, edev->cdev.dev); |
| 263 | cdev_del(&edev->cdev); |
| 264 | unregister_chrdev_region(edev->devt, MINOR_COUNT); |
| 265 | of_reserved_mem_device_release(edev->dev); |
| 266 | |
| 267 | dev_info(edev->dev, "%s\n", __FUNCTION__); |
| 268 | } |