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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2022, STMicroelectronics * Copyright (c) 2016, Linaro Ltd. * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> * Copyright (c) 2012, PetaLogix * Copyright (c) 2011, Texas Instruments, Inc. * Copyright (c) 2011, Google, Inc. * * Based on rpmsg performance statistics driver by Michal Simek, which in turn * was based on TI & Google OMX rpmsg driver. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cdev.h>#include <linux/device.h>#include <linux/fs.h>#include <linux/idr.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rpmsg.h>#include <linux/skbuff.h>#include <linux/slab.h>#include <linux/uaccess.h>#include <uapi/linux/rpmsg.h>
#include "rpmsg_char.h"#include "rpmsg_internal.h"
#define RPMSG_DEV_MAX (MINORMASK + 1)
static dev_t rpmsg_major;
static DEFINE_IDA(rpmsg_ctrl_ida);static DEFINE_IDA(rpmsg_minor_ida);
#define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev)#define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev)
/** * struct rpmsg_ctrldev - control device for instantiating endpoint devices * @rpdev: underlaying rpmsg device * @cdev: cdev for the ctrl device * @dev: device for the ctrl device * @ctrl_lock: serialize the ioctrls. */struct rpmsg_ctrldev { struct rpmsg_device *rpdev; struct cdev cdev; struct device dev; struct mutex ctrl_lock;};
static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp){ struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev);
get_device(&ctrldev->dev); filp->private_data = ctrldev;
return 0;}
static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp){ struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev);
put_device(&ctrldev->dev);
return 0;}
static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, unsigned long arg){ struct rpmsg_ctrldev *ctrldev = fp->private_data; void __user *argp = (void __user *)arg; struct rpmsg_endpoint_info eptinfo; struct rpmsg_channel_info chinfo; struct rpmsg_device *rpdev; int ret = 0;
if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) return -EFAULT;
memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); chinfo.name[RPMSG_NAME_SIZE - 1] = '\0'; chinfo.src = eptinfo.src; chinfo.dst = eptinfo.dst;
mutex_lock(&ctrldev->ctrl_lock); switch (cmd) { case RPMSG_CREATE_EPT_IOCTL: ret = rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo); break;
case RPMSG_CREATE_DEV_IOCTL: rpdev = rpmsg_create_channel(ctrldev->rpdev, &chinfo); if (!rpdev) { dev_err(&ctrldev->dev, "failed to create %s channel\n", chinfo.name); ret = -ENXIO; } break;
case RPMSG_RELEASE_DEV_IOCTL: ret = rpmsg_release_channel(ctrldev->rpdev, &chinfo); if (ret) dev_err(&ctrldev->dev, "failed to release %s channel (%d)\n", chinfo.name, ret); break;
default: ret = -EINVAL; } mutex_unlock(&ctrldev->ctrl_lock);
return ret;};
static const struct file_operations rpmsg_ctrldev_fops = { .owner = THIS_MODULE, .open = rpmsg_ctrldev_open, .release = rpmsg_ctrldev_release, .unlocked_ioctl = rpmsg_ctrldev_ioctl, .compat_ioctl = compat_ptr_ioctl,};
static void rpmsg_ctrldev_release_device(struct device *dev){ struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev);
ida_free(&rpmsg_ctrl_ida, dev->id); ida_free(&rpmsg_minor_ida, MINOR(dev->devt)); kfree(ctrldev);}
static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev){ struct rpmsg_ctrldev *ctrldev; struct device *dev; int ret;
ctrldev = kzalloc_obj(*ctrldev); if (!ctrldev) return -ENOMEM;
ctrldev->rpdev = rpdev;
dev = &ctrldev->dev; device_initialize(dev); dev->parent = &rpdev->dev; dev->class = &rpmsg_class;
mutex_init(&ctrldev->ctrl_lock); cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); ctrldev->cdev.owner = THIS_MODULE;
ret = ida_alloc_max(&rpmsg_minor_ida, RPMSG_DEV_MAX - 1, GFP_KERNEL); if (ret < 0) goto free_ctrldev; dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
ret = ida_alloc(&rpmsg_ctrl_ida, GFP_KERNEL); if (ret < 0) goto free_minor_ida; dev->id = ret; dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret);
ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev); if (ret) goto free_ctrl_ida;
/* We can now rely on the release function for cleanup */ dev->release = rpmsg_ctrldev_release_device;
dev_set_drvdata(&rpdev->dev, ctrldev);
return ret;
free_ctrl_ida: ida_free(&rpmsg_ctrl_ida, dev->id);free_minor_ida: ida_free(&rpmsg_minor_ida, MINOR(dev->devt));free_ctrldev: put_device(dev); kfree(ctrldev);
return ret;}
static void rpmsg_ctrldev_remove(struct rpmsg_device *rpdev){ struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); int ret;
mutex_lock(&ctrldev->ctrl_lock); /* Destroy all endpoints */ ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy); if (ret) dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); mutex_unlock(&ctrldev->ctrl_lock);
cdev_device_del(&ctrldev->cdev, &ctrldev->dev); put_device(&ctrldev->dev);}
static struct rpmsg_driver rpmsg_ctrldev_driver = { .probe = rpmsg_ctrldev_probe, .remove = rpmsg_ctrldev_remove, .drv = { .name = "rpmsg_ctrl", },};
static int rpmsg_ctrldev_init(void){ int ret;
ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg_ctrl"); if (ret < 0) { pr_err("failed to allocate char dev region\n"); return ret; }
ret = register_rpmsg_driver(&rpmsg_ctrldev_driver); if (ret < 0) { pr_err("failed to register rpmsg driver\n"); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); }
return ret;}postcore_initcall(rpmsg_ctrldev_init);
static void rpmsg_ctrldev_exit(void){ unregister_rpmsg_driver(&rpmsg_ctrldev_driver); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);}module_exit(rpmsg_ctrldev_exit);
MODULE_DESCRIPTION("rpmsg control interface");MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);MODULE_LICENSE("GPL v2");