| /* |
| * (C) COPYRIGHT 2020 ARM Limited. All rights reserved. |
| * |
| * This program is free software and is provided to you under the terms of the |
| * GNU General Public License version 2 as published by the Free Software |
| * Foundation, and any use by you of this program is subject to the terms |
| * of such GNU licence. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, you can access it online at |
| * http://www.gnu.org/licenses/gpl-2.0.html. |
| * |
| * SPDX-License-Identifier: GPL-2.0-only |
| */ |
| |
| /**************************************************************************** |
| * Includes |
| ****************************************************************************/ |
| |
| #include "ethosu_device.h" |
| |
| #include "ethosu_buffer.h" |
| #include "ethosu_core_interface.h" |
| #include "ethosu_inference.h" |
| #include "ethosu_network.h" |
| #include "uapi/ethosu.h" |
| |
| #include <linux/delay.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/of_reserved_mem.h> |
| #include <linux/uaccess.h> |
| |
| /**************************************************************************** |
| * Defines |
| ****************************************************************************/ |
| |
| #define MINOR_VERSION 0 /* Minor version starts at 0 */ |
| #define MINOR_COUNT 1 /* Allocate 1 minor version */ |
| #define DMA_ADDR_BITS 32 /* Number of address bits */ |
| |
| /**************************************************************************** |
| * Types |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Functions |
| ****************************************************************************/ |
| |
| /* Incoming messages */ |
| static int ethosu_handle_msg(struct ethosu_device *edev) |
| { |
| int ret; |
| struct ethosu_core_msg header; |
| |
| union { |
| struct ethosu_core_msg_err error; |
| struct ethosu_core_inference_rsp inf; |
| struct ethosu_core_msg_version version; |
| } data; |
| |
| /* Read message */ |
| ret = ethosu_mailbox_read(&edev->mailbox, &header, &data, sizeof(data)); |
| if (ret) |
| return ret; |
| |
| switch (header.type) { |
| case ETHOSU_CORE_MSG_ERR: |
| if (header.length != sizeof(data.error)) { |
| dev_warn(edev->dev, |
| "Msg: Error message of incorrect size. size=%u, expected=%zu\n", header.length, |
| sizeof(data.error)); |
| ret = -EBADMSG; |
| break; |
| } |
| |
| data.error.msg[sizeof(data.error.msg) - 1] = '\0'; |
| dev_warn(edev->dev, "Msg: Error. type=%u, msg=\"%s\"\n", |
| data.error.type, data.error.msg); |
| ret = -EBADMSG; |
| break; |
| case ETHOSU_CORE_MSG_PING: |
| dev_info(edev->dev, "Msg: Ping\n"); |
| ret = ethosu_mailbox_pong(&edev->mailbox); |
| break; |
| case ETHOSU_CORE_MSG_PONG: |
| dev_info(edev->dev, "Msg: Pong\n"); |
| break; |
| case ETHOSU_CORE_MSG_INFERENCE_RSP: |
| if (header.length != sizeof(data.inf)) { |
| dev_warn(edev->dev, |
| "Msg: Inference response of incorrect size. size=%u, expected=%zu\n", header.length, |
| sizeof(data.inf)); |
| ret = -EBADMSG; |
| break; |
| } |
| |
| dev_info(edev->dev, |
| "Msg: Inference response. user_arg=0x%llx, ofm_count=%u, status=%u\n", |
| data.inf.user_arg, data.inf.ofm_count, |
| data.inf.status); |
| ethosu_inference_rsp(edev, &data.inf); |
| break; |
| case ETHOSU_CORE_MSG_VERSION_RSP: |
| if (header.length != sizeof(data.version)) { |
| dev_warn(edev->dev, |
| "Msg: Version response of incorrect size. size=%u, expected=%zu\n", header.length, |
| sizeof(data.version)); |
| ret = -EBADMSG; |
| break; |
| } |
| |
| dev_info(edev->dev, "Msg: Version response v%u.%u.%u\n", |
| data.version.major, data.version.minor, |
| data.version.patch); |
| |
| /* Check major and minor version match, else return error */ |
| if (data.version.major != ETHOSU_CORE_MSG_VERSION_MAJOR || |
| data.version.minor != ETHOSU_CORE_MSG_VERSION_MINOR) { |
| dev_warn(edev->dev, "Msg: Version mismatch detected! "); |
| dev_warn(edev->dev, "Local version: v%u.%u.%u\n", |
| ETHOSU_CORE_MSG_VERSION_MAJOR, |
| ETHOSU_CORE_MSG_VERSION_MINOR, |
| ETHOSU_CORE_MSG_VERSION_PATCH); |
| } |
| |
| break; |
| |
| default: |
| /* This should not happen due to version checks */ |
| dev_warn(edev->dev, "Msg: Protocol error\n"); |
| ret = -EPROTO; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int ethosu_open(struct inode *inode, |
| struct file *file) |
| { |
| struct ethosu_device *edev = |
| container_of(inode->i_cdev, struct ethosu_device, cdev); |
| |
| file->private_data = edev; |
| |
| dev_info(edev->dev, "Opening device node.\n"); |
| |
| return nonseekable_open(inode, file); |
| } |
| |
| static long ethosu_ioctl(struct file *file, |
| unsigned int cmd, |
| unsigned long arg) |
| { |
| struct ethosu_device *edev = file->private_data; |
| void __user *udata = (void __user *)arg; |
| int ret = -EINVAL; |
| |
| ret = mutex_lock_interruptible(&edev->mutex); |
| if (ret) |
| return ret; |
| |
| dev_info(edev->dev, "Ioctl. cmd=%u, arg=%lu\n", cmd, arg); |
| |
| switch (cmd) { |
| case ETHOSU_IOCTL_VERSION_REQ: |
| dev_info(edev->dev, "Ioctl: Send version request\n"); |
| ret = ethosu_mailbox_version_request(&edev->mailbox); |
| break; |
| case ETHOSU_IOCTL_PING: { |
| dev_info(edev->dev, "Ioctl: Send ping\n"); |
| ret = ethosu_mailbox_ping(&edev->mailbox); |
| break; |
| } |
| case ETHOSU_IOCTL_BUFFER_CREATE: { |
| struct ethosu_uapi_buffer_create uapi; |
| |
| dev_info(edev->dev, "Ioctl: Buffer create\n"); |
| |
| if (copy_from_user(&uapi, udata, sizeof(uapi))) |
| break; |
| |
| dev_info(edev->dev, "Ioctl: Buffer. capacity=%u\n", |
| uapi.capacity); |
| |
| ret = ethosu_buffer_create(edev, uapi.capacity); |
| break; |
| } |
| case ETHOSU_IOCTL_NETWORK_CREATE: { |
| struct ethosu_uapi_network_create uapi; |
| |
| if (copy_from_user(&uapi, udata, sizeof(uapi))) |
| break; |
| |
| dev_info(edev->dev, "Ioctl: Network. fd=%u\n", uapi.fd); |
| |
| ret = ethosu_network_create(edev, &uapi); |
| break; |
| } |
| default: { |
| dev_err(edev->dev, "Invalid ioctl. cmd=%u, arg=%lu", |
| cmd, arg); |
| break; |
| } |
| } |
| |
| mutex_unlock(&edev->mutex); |
| |
| return ret; |
| } |
| |
| static void ethosu_mbox_rx(void *user_arg) |
| { |
| struct ethosu_device *edev = user_arg; |
| int ret; |
| |
| mutex_lock(&edev->mutex); |
| |
| do { |
| ret = ethosu_handle_msg(edev); |
| if (ret && ret != -ENOMSG) |
| /* Need to start over in case of error, empty the queue |
| * by fast-forwarding read position to write position. |
| * */ |
| ethosu_mailbox_reset(&edev->mailbox); |
| } while (ret == 0); |
| |
| mutex_unlock(&edev->mutex); |
| } |
| |
| int ethosu_dev_init(struct ethosu_device *edev, |
| struct device *dev, |
| struct class *class, |
| struct resource *in_queue, |
| struct resource *out_queue) |
| { |
| static const struct file_operations fops = { |
| .owner = THIS_MODULE, |
| .open = ðosu_open, |
| .unlocked_ioctl = ðosu_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ðosu_ioctl, |
| #endif |
| }; |
| struct device *sysdev; |
| int ret; |
| |
| edev->dev = dev; |
| edev->class = class; |
| mutex_init(&edev->mutex); |
| INIT_LIST_HEAD(&edev->inference_list); |
| |
| ret = of_reserved_mem_device_init(edev->dev); |
| if (ret) |
| return ret; |
| |
| dma_set_mask_and_coherent(edev->dev, DMA_BIT_MASK(DMA_ADDR_BITS)); |
| |
| ret = ethosu_mailbox_init(&edev->mailbox, dev, in_queue, out_queue, |
| ethosu_mbox_rx, edev); |
| if (ret) |
| goto release_reserved_mem; |
| |
| ret = alloc_chrdev_region(&edev->devt, MINOR_VERSION, MINOR_COUNT, |
| "ethosu"); |
| if (ret) { |
| dev_err(edev->dev, "Failed to allocate chrdev region.\n"); |
| goto deinit_mailbox; |
| } |
| |
| cdev_init(&edev->cdev, &fops); |
| edev->cdev.owner = THIS_MODULE; |
| |
| ret = cdev_add(&edev->cdev, edev->devt, MINOR_COUNT); |
| if (ret) { |
| dev_err(edev->dev, "Failed to add character device.\n"); |
| goto region_unregister; |
| } |
| |
| sysdev = device_create(edev->class, NULL, edev->devt, edev, |
| "ethosu%d", MAJOR(edev->devt)); |
| if (IS_ERR(sysdev)) { |
| dev_err(edev->dev, "Failed to create device.\n"); |
| ret = PTR_ERR(sysdev); |
| goto del_cdev; |
| } |
| |
| dev_info(edev->dev, |
| "Created Arm Ethos-U device. name=%s, major=%d, minor=%d\n", |
| dev_name(sysdev), MAJOR(edev->devt), MINOR(edev->devt)); |
| |
| return 0; |
| |
| del_cdev: |
| cdev_del(&edev->cdev); |
| |
| region_unregister: |
| unregister_chrdev_region(edev->devt, 1); |
| |
| deinit_mailbox: |
| ethosu_mailbox_deinit(&edev->mailbox); |
| |
| release_reserved_mem: |
| of_reserved_mem_device_release(edev->dev); |
| |
| return ret; |
| } |
| |
| void ethosu_dev_deinit(struct ethosu_device *edev) |
| { |
| ethosu_mailbox_deinit(&edev->mailbox); |
| device_destroy(edev->class, edev->cdev.dev); |
| cdev_del(&edev->cdev); |
| unregister_chrdev_region(edev->devt, MINOR_COUNT); |
| of_reserved_mem_device_release(edev->dev); |
| |
| dev_info(edev->dev, "%s\n", __FUNCTION__); |
| } |