diff options
Diffstat (limited to 'kernel/common')
| -rw-r--r-- | kernel/common/ethosu_buffer.c | 215 | ||||
| -rw-r--r-- | kernel/common/ethosu_device.c | 560 | ||||
| -rw-r--r-- | kernel/common/ethosu_dma_mem.c | 77 | ||||
| -rw-r--r-- | kernel/common/ethosu_driver.c | 161 |
4 files changed, 1013 insertions, 0 deletions
diff --git a/kernel/common/ethosu_buffer.c b/kernel/common/ethosu_buffer.c new file mode 100644 index 0000000..cf41b8d --- /dev/null +++ b/kernel/common/ethosu_buffer.c @@ -0,0 +1,215 @@ +/* + * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> + * SPDX-License-Identifier: GPL-2.0-only + * + * 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. + */ + +/**************************************************************************** + * Includes + ****************************************************************************/ + +#include <common/ethosu_buffer.h> + +#include <common/ethosu_device.h> +#include <common/ethosu_dma_mem.h> +#include <uapi/ethosu.h> + +#include <linux/anon_inodes.h> +#include <linux/dma-mapping.h> +#include <linux/of_address.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/remoteproc.h> +#include <linux/uaccess.h> + +/**************************************************************************** + * Variables + ****************************************************************************/ + +static int ethosu_buffer_release(struct inode *inode, + struct file *file); + +static int ethosu_buffer_mmap(struct file *file, + struct vm_area_struct *vma); + +static loff_t ethosu_buffer_llseek(struct file *file, + loff_t offset, + int whence); + +static const struct file_operations ethosu_buffer_fops = { + .release = ðosu_buffer_release, + .mmap = ðosu_buffer_mmap, + .llseek = ðosu_buffer_llseek, +}; + +/**************************************************************************** + * Functions + ****************************************************************************/ + +static bool ethosu_buffer_verify(struct file *file) +{ + return file->f_op == ðosu_buffer_fops; +} + +static void ethosu_buffer_destroy(struct kref *kref) +{ + struct ethosu_buffer *buf = + container_of(kref, struct ethosu_buffer, kref); + struct device *dev = buf->dev; + + dev_dbg(dev, "Buffer destroy. buf=0x%pK", buf); + + ethosu_dma_mem_free(&buf->dma_mem); + + memset(buf, 0, sizeof(*buf)); + devm_kfree(dev, buf); +} + +static int ethosu_buffer_release(struct inode *inode, + struct file *file) +{ + struct ethosu_buffer *buf = file->private_data; + struct device *dev = buf->dev; + + dev_dbg(dev, "Buffer release. file=0x%pK, buf=0x%pK\n", + file, buf); + + ethosu_buffer_put(buf); + + return 0; +} + +static int ethosu_buffer_mmap(struct file *file, + struct vm_area_struct *vma) +{ + struct ethosu_buffer *buf = file->private_data; + struct device *dev = buf->dev; + int ret; + + dev_dbg(dev, "Buffer mmap. file=0x%pK, buf=0x%pK\n", + file, buf); + + ret = dma_mmap_coherent(dev, vma, buf->dma_mem->cpu_addr, + buf->dma_mem->dma_addr, buf->dma_mem->size); + + return ret; +} + +static loff_t ethosu_buffer_llseek(struct file *file, + loff_t offset, + int whence) +{ + struct ethosu_buffer *buf = file->private_data; + + if (offset != 0) + return -EINVAL; + + /* + * SEEK_END and SEEK_SET is supported with a zero offset to allow buffer + * size discovery using seek functions e.g. + * size = lseek(buf_fd, 0, SEEK_END); + * lseek(buf_fd, 0, SEEK_SET); + */ + switch (whence) { + case SEEK_END: + return buf->dma_mem->size; + case SEEK_SET: + return 0; + default: + return -EINVAL; + } +} + +int ethosu_buffer_create(struct device *dev, + size_t size) +{ + struct ethosu_buffer *buf; + int ret = -ENOMEM; + + if (!size) + return -EINVAL; + + buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf->dev = dev; + kref_init(&buf->kref); + + buf->dma_mem = ethosu_dma_mem_alloc(dev, size); + if (IS_ERR(buf->dma_mem)) { + ret = PTR_ERR(buf->dma_mem); + goto free_buf; + } + + ret = anon_inode_getfd("ethosu-buffer", ðosu_buffer_fops, buf, + O_RDWR | O_CLOEXEC); + if (ret < 0) + goto free_dma; + + buf->file = fget(ret); + buf->file->f_mode |= FMODE_LSEEK; + + fput(buf->file); + + dev_dbg(dev, + "Buffer create. file=0x%pK, fd=%d, buf=0x%pK, size=%zu, cpu_addr=0x%pK, dma_addr=0x%llx, phys_addr=0x%llx\n", + buf->file, ret, buf, size, buf->dma_mem->cpu_addr, + buf->dma_mem->dma_addr, virt_to_phys(buf->dma_mem->cpu_addr)); + + return ret; + +free_dma: + ethosu_dma_mem_free(&buf->dma_mem); + +free_buf: + memset(buf, 0, sizeof(*buf)); + devm_kfree(dev, buf); + + return ret; +} + +struct ethosu_buffer *ethosu_buffer_get_from_fd(int fd) +{ + struct ethosu_buffer *buf; + struct file *file; + + file = fget(fd); + if (!file) + return ERR_PTR(-EINVAL); + + if (!ethosu_buffer_verify(file)) { + fput(file); + + return ERR_PTR(-EINVAL); + } + + buf = file->private_data; + ethosu_buffer_get(buf); + fput(file); + + return buf; +} + +void ethosu_buffer_get(struct ethosu_buffer *buf) +{ + kref_get(&buf->kref); +} + +void ethosu_buffer_put(struct ethosu_buffer *buf) +{ + kref_put(&buf->kref, ethosu_buffer_destroy); +} diff --git a/kernel/common/ethosu_device.c b/kernel/common/ethosu_device.c new file mode 100644 index 0000000..f1e00ab --- /dev/null +++ b/kernel/common/ethosu_device.c @@ -0,0 +1,560 @@ +/* + * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> + * SPDX-License-Identifier: GPL-2.0-only + * + * 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. + */ + +/**************************************************************************** + * Includes + ****************************************************************************/ + +#include <common/ethosu_device.h> + +#include <common/ethosu_buffer.h> +#include <rpmsg/ethosu_rpmsg.h> +#include <rpmsg/ethosu_rpmsg_cancel_inference.h> +#include <rpmsg/ethosu_rpmsg_capabilities.h> +#include <rpmsg/ethosu_rpmsg_inference.h> +#include <rpmsg/ethosu_rpmsg_network.h> +#include <rpmsg/ethosu_rpmsg_network_info.h> +#include <rpmsg/ethosu_rpmsg_version.h> +#include <uapi/ethosu.h> + +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/io.h> +#include <linux/of_device.h> +#include <linux/of_reserved_mem.h> +#include <linux/remoteproc.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +/**************************************************************************** + * Defines + ****************************************************************************/ + +#define MINOR_BASE 0 /* Minor version starts at 0 */ +#define MINOR_COUNT 64 /* Allocate minor versions */ + +/**************************************************************************** + * Variables + ****************************************************************************/ + +static DECLARE_BITMAP(minors, MINOR_COUNT); + +/**************************************************************************** + * Functions + ****************************************************************************/ + +/* Incoming messages */ +static int ethosu_handle_rpmsg(struct rpmsg_device *rpdev, + void *data, + int len, + void *priv, + u32 src) +{ + struct ethosu_device *edev = dev_get_drvdata(&rpdev->dev); + struct device *dev = &edev->dev; + struct ethosu_mailbox *mbox = &edev->mailbox; + struct ethosu_core_rpmsg *rpmsg = data; + int length = len - sizeof(rpmsg->header); + int ret = 0; + + if (unlikely(rpmsg->header.magic != ETHOSU_CORE_MSG_MAGIC)) { + dev_warn(dev, "Msg: Error invalid message magic. magic=0x%08x", + rpmsg->header.magic); + + return -EBADMSG; + } + + device_lock(dev); + + dev_dbg(dev, + "Msg: magic=0x%08x, type=%u, msg_id=%llu", + rpmsg->header.magic, rpmsg->header.type, rpmsg->header.msg_id); + + switch (rpmsg->header.type) { + case ETHOSU_CORE_MSG_ERR: + if (length != sizeof(rpmsg->error)) { + dev_warn(dev, + "Msg: Error message of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->error)); + ret = -EBADMSG; + break; + } + + rpmsg->error.msg[sizeof(rpmsg->error.msg) - 1] = '\0'; + dev_warn(dev, "Msg: Error. type=%u, msg=\"%s\"", + rpmsg->error.type, rpmsg->error.msg); + + rproc_report_crash(rproc_get_by_child(dev), RPROC_FATAL_ERROR); + break; + case ETHOSU_CORE_MSG_PING: + dev_dbg(dev, "Msg: Ping"); + ret = ethosu_mailbox_pong(mbox); + break; + case ETHOSU_CORE_MSG_PONG: + dev_dbg(dev, "Msg: Pong"); + break; + case ETHOSU_CORE_MSG_INFERENCE_RSP: + if (length != sizeof(rpmsg->inf_rsp)) { + dev_warn(dev, + "Msg: Inference response of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->inf_rsp)); + ret = -EBADMSG; + break; + } + + dev_dbg(dev, + "Msg: Inference response. ofm_count=%u, status=%u", + rpmsg->inf_rsp.ofm_count, rpmsg->inf_rsp.status); + + ethosu_inference_rsp(mbox, rpmsg->header.msg_id, + &rpmsg->inf_rsp); + break; + case ETHOSU_CORE_MSG_CANCEL_INFERENCE_RSP: + if (length != sizeof(rpmsg->cancel_rsp)) { + dev_warn(dev, + "Msg: Cancel Inference response of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->cancel_rsp)); + ret = -EBADMSG; + break; + } + + dev_dbg(dev, + "Msg: Cancel Inference response. status=%u", + rpmsg->cancel_rsp.status); + ethosu_cancel_inference_rsp(mbox, + rpmsg->header.msg_id, + &rpmsg->cancel_rsp); + break; + case ETHOSU_CORE_MSG_VERSION_RSP: + if (length != sizeof(rpmsg->version_rsp)) { + dev_warn(dev, + "Msg: Protocol version response of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->version_rsp)); + ret = -EBADMSG; + break; + } + + dev_dbg(dev, "Msg: Protocol version response %u.%u.%u", + rpmsg->version_rsp.major, rpmsg->version_rsp.minor, + rpmsg->version_rsp.patch); + + ethosu_version_rsp(mbox, rpmsg->header.msg_id, + &rpmsg->version_rsp); + break; + case ETHOSU_CORE_MSG_CAPABILITIES_RSP: + if (length != sizeof(rpmsg->cap_rsp)) { + dev_warn(dev, + "Msg: Capabilities response of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->cap_rsp)); + ret = -EBADMSG; + break; + } + + dev_dbg(dev, + "Msg: Capabilities response vs%hhu v%hhu.%hhu p%hhu av%hhu.%hhu.%hhu dv%hhu.%hhu.%hhu mcc%hhu csv%hhu cd%hhu", + rpmsg->cap_rsp.version_status, + rpmsg->cap_rsp.version_major, + rpmsg->cap_rsp.version_minor, + rpmsg->cap_rsp.product_major, + rpmsg->cap_rsp.arch_major_rev, + rpmsg->cap_rsp.arch_minor_rev, + rpmsg->cap_rsp.arch_patch_rev, + rpmsg->cap_rsp.driver_major_rev, + rpmsg->cap_rsp.driver_minor_rev, + rpmsg->cap_rsp.driver_patch_rev, + rpmsg->cap_rsp.macs_per_cc, + rpmsg->cap_rsp.cmd_stream_version, + rpmsg->cap_rsp.custom_dma); + + ethosu_capability_rsp(mbox, rpmsg->header.msg_id, + &rpmsg->cap_rsp); + break; + case ETHOSU_CORE_MSG_NETWORK_INFO_RSP: + if (length != sizeof(rpmsg->net_info_rsp)) { + dev_warn(dev, + "Msg: Network info response of incorrect size. size=%u, expected=%zu", length, + sizeof(rpmsg->net_info_rsp)); + ret = -EBADMSG; + break; + } + + dev_dbg(dev, + "Msg: Network info response. status=%u", + rpmsg->net_info_rsp.status); + + ethosu_network_info_rsp(mbox, + rpmsg->header.msg_id, + &rpmsg->net_info_rsp); + + break; + default: + /* This should not happen due to version checks */ + dev_warn(dev, "Msg: Protocol error. type=%u", + rpmsg->header.type); + ret = -EPROTO; + break; + } + + device_unlock(dev); + + wake_up(&mbox->send_queue); + + return ret; +} + +static int ethosu_open(struct inode *inode, + struct file *file) +{ + struct cdev *cdev = inode->i_cdev; + struct ethosu_device *edev = container_of(cdev, struct ethosu_device, + cdev); + struct rpmsg_device *rpdev = edev->rpdev; + struct device *dev = &edev->dev; + + dev_dbg(dev, "Device open. file=0x%pK", file); + + file->private_data = rpdev; + + return nonseekable_open(inode, file); +} + +static long ethosu_ioctl(struct file *file, + unsigned int cmd, + unsigned long arg) +{ + struct rpmsg_device *rpdev = file->private_data; + struct ethosu_device *edev = dev_get_drvdata(&rpdev->dev); + struct device *dev = &edev->dev; + void __user *udata = (void __user *)arg; + int ret; + + switch (cmd) { + case ETHOSU_IOCTL_DRIVER_VERSION_GET: { + const struct ethosu_uapi_kernel_driver_version version = { + .major = ETHOSU_KERNEL_DRIVER_VERSION_MAJOR, + .minor = ETHOSU_KERNEL_DRIVER_VERSION_MINOR, + .patch = ETHOSU_KERNEL_DRIVER_VERSION_PATCH, + }; + + ret = copy_to_user(udata, &version, + sizeof(version)) ? -EFAULT : 0; + break; + } + case ETHOSU_IOCTL_CAPABILITIES_REQ: { + dev_dbg(dev, "Device ioctl: Capabilities request"); + + ret = copy_to_user(udata, &edev->capabilities, + sizeof(edev->capabilities)) ? -EFAULT : 0; + break; + } + case ETHOSU_IOCTL_PING: { + ret = device_lock_interruptible(dev); + if (ret) + return ret; + + dev_dbg(dev, "Device ioctl: Send ping"); + + ret = ethosu_mailbox_ping(&edev->mailbox); + + device_unlock(dev); + + break; + } + case ETHOSU_IOCTL_BUFFER_CREATE: { + struct ethosu_uapi_buffer_create uapi; + + if (copy_from_user(&uapi, udata, sizeof(uapi))) { + ret = -EFAULT; + break; + } + + ret = device_lock_interruptible(dev); + if (ret) + return ret; + + dev_dbg(dev, + "Device ioctl: Buffer create. size=%u", + uapi.size); + + ret = ethosu_buffer_create(dev, uapi.size); + + device_unlock(dev); + + break; + } + case ETHOSU_IOCTL_NETWORK_CREATE: { + struct ethosu_uapi_network_create uapi; + + if (copy_from_user(&uapi, udata, sizeof(uapi))) { + ret = -EFAULT; + break; + } + + ret = device_lock_interruptible(dev); + if (ret) + return ret; + + dev_dbg(dev, + "Device ioctl: Network create. type=%u\n", uapi.type); + + ret = ethosu_network_create(dev, &edev->mailbox, &uapi); + + device_unlock(dev); + + break; + } + default: { + dev_err(dev, "Invalid ioctl. cmd=%u, arg=%lu", + cmd, arg); + ret = -ENOIOCTLCMD; + break; + } + } + + return ret; +} + +static struct rpmsg_endpoint *ethosu_create_ept(struct rpmsg_device *rpdev) +{ + struct device *dev = &rpdev->dev; + struct rpmsg_channel_info info = { 0 }; + struct rpmsg_endpoint *ept; + + /* Create rpmsg endpoint */ + strncpy(info.name, rpdev->id.name, sizeof(info.name) - 1); + info.src = 0; + info.dst = rpdev->dst; + + dev_dbg(dev, "Creating rpmsg endpoint. name=%s, src=%u, dst=%u", + info.name, info.src, info.dst); + + ept = rpmsg_create_ept(rpdev, ethosu_handle_rpmsg, NULL, info); + if (!ept) { + dev_err(&rpdev->dev, "Failed to create endpoint"); + + return ERR_PTR(-EINVAL); + } + + return ept; +} + +static const struct file_operations fops = { + .owner = THIS_MODULE, + .open = ðosu_open, + .unlocked_ioctl = ðosu_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ðosu_ioctl, +#endif +}; + +static void ethosu_dev_release(struct device *dev) +{ + struct ethosu_device *edev = dev_get_drvdata(dev); + + clear_bit(MINOR(edev->cdev.dev), minors); + + ethosu_mailbox_deinit(&edev->mailbox); + device_destroy(edev->class, edev->cdev.dev); + kfree(edev); +} + +static int ethosu_device_register(struct device *dev, + struct device *parent, + void *drvdata, + dev_t devt) +{ + struct rproc *rproc = rproc_get_by_child(parent); + int ret; + + dev->parent = parent; + dev->release = ethosu_dev_release; + dev_set_drvdata(dev, drvdata); + + ret = dev_set_name(dev, "ethosu%d", MINOR(devt)); + if (ret) { + dev_err(parent, "Failed to set device name. ret=%d", ret); + + return ret; + } + + /* Inherit DMA mask from rproc device */ + ret = dma_coerce_mask_and_coherent(dev, + dma_get_mask(rproc->dev.parent)); + if (ret) { + dev_err(parent, "Failed to set DMA mask. ret=%d", ret); + + return ret; + } + + /* Inherit DMA configuration from rproc device */ + ret = of_dma_configure(dev, rproc->dev.parent->of_node, false); + if (ret) { + dev_err(parent, "Failed to configure DMA. ret=%d", + ret); + + return ret; + } + + /* Inherit reserved memory from rproc device */ + ret = of_reserved_mem_device_init_by_idx(dev, + rproc->dev.parent->of_node, 0); + if (ret) { + dev_err(parent, "Failed to initialize reserved memory. ret=%d", + ret); + + return ret; + } + + ret = device_register(dev); + if (ret) { + dev_err(parent, "Failed to register device. ret=%d", ret); + + return ret; + } + + return 0; +} + +int ethosu_dev_init(struct rpmsg_device *rpdev, + struct class *class, + dev_t devt) +{ + struct device *dev = &rpdev->dev; + struct ethosu_device *edev; + struct device *sysdev; + int minor; + int ret; + + /* Reserve minor number for device node */ + minor = find_first_zero_bit(minors, MINOR_COUNT); + if (minor >= MINOR_COUNT) { + dev_err(dev, "No more minor numbers."); + + return -ENOMEM; + } + + devt = MKDEV(MAJOR(devt), minor); + + /* Allocate and create Ethos-U device */ + edev = kzalloc(sizeof(*edev), GFP_KERNEL); + if (!edev) + return -ENOMEM; + + dev_set_drvdata(&rpdev->dev, edev); + + edev->rpdev = rpdev; + edev->class = class; + + /* Create device object */ + ret = ethosu_device_register(&edev->dev, &rpdev->dev, edev, + devt); + if (ret) { + kfree(edev); + + return ret; + } + + /* Continue with new device */ + dev = &edev->dev; + + /* Create RPMsg endpoint */ + edev->ept = ethosu_create_ept(rpdev); + if (IS_ERR(edev->ept)) { + ret = PTR_ERR(edev->ept); + goto device_unregister; + } + + ret = ethosu_mailbox_init(&edev->mailbox, dev, edev->ept); + if (ret) + goto free_rpmsg_ept; + + device_lock(dev); + ret = ethosu_version_check_request(dev, &edev->mailbox); + device_unlock(dev); + if (ret) { + dev_err(dev, "Protocol version check failed: %d", ret); + goto deinit_mailbox; + } + + device_lock(dev); + ret = ethosu_capabilities_request(dev, &edev->mailbox, + &edev->capabilities); + device_unlock(dev); + if (ret) { + dev_err(dev, "Failed to get device capabilities: %d", ret); + goto deinit_mailbox; + } + + /* Create device node */ + cdev_init(&edev->cdev, &fops); + edev->cdev.owner = THIS_MODULE; + + cdev_set_parent(&edev->cdev, &dev->kobj); + + ret = cdev_add(&edev->cdev, devt, 1); + if (ret) { + dev_err(dev, "Failed to add character device."); + goto deinit_mailbox; + } + + sysdev = device_create(edev->class, NULL, devt, rpdev, + "ethosu%d", MINOR(devt)); + if (IS_ERR(sysdev)) { + dev_err(dev, "Failed to create device."); + ret = PTR_ERR(sysdev); + goto del_cdev; + } + + set_bit(minor, minors); + + dev_info(dev, + "Created Arm Ethos-U device. name=%s, major=%d, minor=%d", + dev_name(sysdev), MAJOR(devt), MINOR(devt)); + + return 0; + +del_cdev: + cdev_del(&edev->cdev); + +deinit_mailbox: + ethosu_mailbox_deinit(&edev->mailbox); + +free_rpmsg_ept: + rpmsg_destroy_ept(edev->ept); + +device_unregister: + device_unregister(dev); + + return ret; +} + +void ethosu_dev_deinit(struct rpmsg_device *rpdev) +{ + struct device *dev = &rpdev->dev; + struct ethosu_device *edev = dev_get_drvdata(dev); + + device_lock(&edev->dev); + ethosu_mailbox_fail(&edev->mailbox); + device_unlock(&edev->dev); + + rpmsg_destroy_ept(edev->ept); + cdev_del(&edev->cdev); + device_unregister(&edev->dev); +} diff --git a/kernel/common/ethosu_dma_mem.c b/kernel/common/ethosu_dma_mem.c new file mode 100644 index 0000000..0e05978 --- /dev/null +++ b/kernel/common/ethosu_dma_mem.c @@ -0,0 +1,77 @@ +/* + * SPDX-FileCopyrightText: Copyright 2023-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> + * SPDX-License-Identifier: GPL-2.0-only + * + * 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. + */ + +/**************************************************************************** + * Includes + ****************************************************************************/ + +#include <common/ethosu_dma_mem.h> + +#include <linux/err.h> +#include <linux/dma-mapping.h> + +/**************************************************************************** + * Functions + ****************************************************************************/ + +struct ethosu_dma_mem *ethosu_dma_mem_alloc(struct device *dev, + size_t size) +{ + struct ethosu_dma_mem *dma_mem; + + if (!size) + return ERR_PTR(-EINVAL); + + dma_mem = devm_kzalloc(dev, sizeof(*dma_mem), GFP_KERNEL); + if (!dma_mem) + return ERR_PTR(-ENOMEM); + + dma_mem->dev = dev; + dma_mem->size = size; + dma_mem->cpu_addr = dma_alloc_coherent(dev, size, &dma_mem->dma_addr, + GFP_KERNEL); + if (!dma_mem->cpu_addr) { + memset(dma_mem, 0, sizeof(*dma_mem)); + devm_kfree(dev, dma_mem); + + return ERR_PTR(-ENOMEM); + } + + return dma_mem; +} + +void ethosu_dma_mem_free(struct ethosu_dma_mem **dma_mem) +{ + struct device *dev; + struct ethosu_dma_mem *mem; + + if (!dma_mem || !*dma_mem) + return; + + mem = *dma_mem; + dev = mem->dev; + + memset(mem->cpu_addr, 0, mem->size); + dma_free_coherent(dev, mem->size, mem->cpu_addr, mem->dma_addr); + + memset(mem, 0, sizeof(*mem)); + devm_kfree(dev, mem); + + *dma_mem = NULL; +} diff --git a/kernel/common/ethosu_driver.c b/kernel/common/ethosu_driver.c new file mode 100644 index 0000000..15f13b5 --- /dev/null +++ b/kernel/common/ethosu_driver.c @@ -0,0 +1,161 @@ +/* + * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> + * SPDX-License-Identifier: GPL-2.0-only + * + * 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. + */ + +#include <common/ethosu_device.h> +#include <uapi/ethosu.h> + +#include <linux/bitmap.h> +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/rpmsg.h> + +/**************************************************************************** + * Defines + ****************************************************************************/ + +#define ETHOSU_DRIVER_STR(s) #s +#define ETHOSU_DRIVER_VERSION_STR(major, minor, patch) \ + ETHOSU_DRIVER_STR(major) "." \ + ETHOSU_DRIVER_STR(minor) "." \ + ETHOSU_DRIVER_STR(patch) +#define ETHOSU_DRIVER_VERSION ETHOSU_DRIVER_VERSION_STR( \ + ETHOSU_KERNEL_DRIVER_VERSION_MAJOR, \ + ETHOSU_KERNEL_DRIVER_VERSION_MINOR, \ + ETHOSU_KERNEL_DRIVER_VERSION_PATCH) + +#define ETHOSU_DRIVER_NAME "ethosu" + +#define MINOR_BASE 0 /* Minor version starts at 0 */ +#define MINOR_COUNT 64 /* Allocate minor versions */ + +/**************************************************************************** + * Variables + ****************************************************************************/ + +static struct class *ethosu_class; + +static dev_t devt; + +/**************************************************************************** + * Rpmsg driver + ****************************************************************************/ + +static int ethosu_rpmsg_probe(struct rpmsg_device *rpdev) +{ + int ret; + + /* Initialize device */ + ret = ethosu_dev_init(rpdev, ethosu_class, devt); + if (ret) + return ret; + + return 0; +} + +static void ethosu_rpmsg_remove(struct rpmsg_device *rpdev) +{ + ethosu_dev_deinit(rpdev); +} + +static int ethosu_rpmsg_cb(struct rpmsg_device *rpdev, + void *data, + int len, + void *priv, + u32 src) +{ + dev_err(&rpdev->dev, "%s", __FUNCTION__); + + return -EINVAL; +} + +static struct rpmsg_device_id ethosu_rpmsg_driver_id_table[] = { + { .name = "ethos-u-0.0" }, + {}, +}; + +MODULE_DEVICE_TABLE(rpmsg, ethosu_rpmsg_driver_id_table); + +static struct rpmsg_driver ethosu_rpmsg_driver = { + .drv = { + .name = ETHOSU_DRIVER_NAME, + .owner = THIS_MODULE, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table = ethosu_rpmsg_driver_id_table, + .probe = ethosu_rpmsg_probe, + .callback = ethosu_rpmsg_cb, + .remove = ethosu_rpmsg_remove, +}; + +/**************************************************************************** + * Module init and exit + ****************************************************************************/ + +static void __exit ethosu_exit(void) +{ + unregister_rpmsg_driver(ðosu_rpmsg_driver); + unregister_chrdev_region(devt, MINOR_COUNT); + class_destroy(ethosu_class); +} + +static int __init ethosu_init(void) +{ + int ret; + + ethosu_class = class_create(THIS_MODULE, ETHOSU_DRIVER_NAME); + if (IS_ERR(ethosu_class)) { + pr_err("Failed to create class '%s'.\n", ETHOSU_DRIVER_NAME); + + return PTR_ERR(ethosu_class); + } + + ret = alloc_chrdev_region(&devt, MINOR_BASE, MINOR_COUNT, + ETHOSU_DRIVER_NAME); + if (ret) { + pr_err("Failed to allocate chrdev region.\n"); + goto destroy_class; + } + + ret = register_rpmsg_driver(ðosu_rpmsg_driver); + if (ret) { + pr_err("Failed to register Arm Ethos-U rpmsg driver.\n"); + goto region_unregister; + } + + return 0; + +region_unregister: + unregister_chrdev_region(devt, MINOR_COUNT); + +destroy_class: + class_destroy(ethosu_class); + + return ret; +} + +module_init(ethosu_init) +module_exit(ethosu_exit) + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Arm Ltd"); +MODULE_DESCRIPTION("Arm Ethos-U NPU Driver"); +MODULE_VERSION(ETHOSU_DRIVER_VERSION); |