On Tue, Mar 23, 2021 at 01:27:32PM +0100, Arnaud Pouliquen wrote: > Create the rpmsg_ctrl.c module and move the code related to the > rpmsg_ctrldev device in this new module. > > Add the dependency between rpmsg_char and rpmsg_ctrl in the > kconfig file. > > Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx> > --- > update from [1]: > - keep rpmsg_ctrldev prefix (no more functions and structures renaming), > That is much better > [1]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20210219111501.14261-7-arnaud.pouliquen@xxxxxxxxxxx/ > --- > drivers/rpmsg/Kconfig | 9 ++ > drivers/rpmsg/Makefile | 1 + > drivers/rpmsg/rpmsg_char.c | 177 +--------------------------- > drivers/rpmsg/rpmsg_ctrl.c | 233 +++++++++++++++++++++++++++++++++++++ > 4 files changed, 244 insertions(+), 176 deletions(-) > create mode 100644 drivers/rpmsg/rpmsg_ctrl.c > > diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig > index 0b4407abdf13..d822ec9ec692 100644 > --- a/drivers/rpmsg/Kconfig > +++ b/drivers/rpmsg/Kconfig > @@ -10,11 +10,20 @@ config RPMSG_CHAR > tristate "RPMSG device interface" > depends on RPMSG > depends on NET > + select RPMSG_CTRL > help > Say Y here to export rpmsg endpoints as device files, usually found > in /dev. They make it possible for user-space programs to send and > receive rpmsg packets. > > +config RPMSG_CTRL > + tristate "RPMSG control interface" > + depends on RPMSG > + help > + Say Y here to enable the support of the /dev/rpmsg_ctrlX API. This API > + allows user-space programs to create endpoints with specific service name, > + source and destination addresses. > + > config RPMSG_NS > tristate "RPMSG name service announcement" > depends on RPMSG > diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile > index 8d452656f0ee..58e3b382e316 100644 > --- a/drivers/rpmsg/Makefile > +++ b/drivers/rpmsg/Makefile > @@ -1,6 +1,7 @@ > # SPDX-License-Identifier: GPL-2.0 > obj-$(CONFIG_RPMSG) += rpmsg_core.o > obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o > +obj-$(CONFIG_RPMSG_CTRL) += rpmsg_ctrl.o > obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o > obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o > qcom_glink-objs := qcom_glink_native.o qcom_glink_ssr.o > diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c > index b9df8dc4365f..5d4a768002ce 100644 > --- a/drivers/rpmsg/rpmsg_char.c > +++ b/drivers/rpmsg/rpmsg_char.c > @@ -29,30 +29,13 @@ > #define RPMSG_DEV_MAX (MINORMASK + 1) > That define is also present in rpmsg_ctrl.c. As such I would move it to rpmsg_char.h. > static dev_t rpmsg_major; > -static struct class *rpmsg_class; > > -static DEFINE_IDA(rpmsg_ctrl_ida); > static DEFINE_IDA(rpmsg_ept_ida); > static DEFINE_IDA(rpmsg_minor_ida); > > #define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev) > #define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev) > > -#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 > - */ > -struct rpmsg_ctrldev { > - struct rpmsg_device *rpdev; > - struct cdev cdev; > - struct device dev; > -}; > - > /** > * struct rpmsg_eptdev - endpoint device context > * @dev: endpoint device > @@ -409,169 +392,13 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent > } > EXPORT_SYMBOL(rpmsg_chrdev_create_eptdev); > > -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; > - > - if (cmd != RPMSG_CREATE_EPT_IOCTL) > - return -EINVAL; > - > - 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; > - > - return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, &ctrldev->dev, chinfo, rpmsg_class); > -}; > - > -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_simple_remove(&rpmsg_ctrl_ida, dev->id); > - ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); > - cdev_del(&ctrldev->cdev); > - kfree(ctrldev); > -} > - > -static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) > -{ > - struct rpmsg_ctrldev *ctrldev; > - struct device *dev; > - int ret; > - > - ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); > - if (!ctrldev) > - return -ENOMEM; > - > - ctrldev->rpdev = rpdev; > - > - dev = &ctrldev->dev; > - device_initialize(dev); > - dev->parent = &rpdev->dev; > - dev->class = rpmsg_class; > - > - cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); > - ctrldev->cdev.owner = THIS_MODULE; > - > - ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); > - if (ret < 0) > - goto free_ctrldev; > - dev->devt = MKDEV(MAJOR(rpmsg_major), ret); > - > - ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); > - if (ret < 0) > - goto free_minor_ida; > - dev->id = ret; > - dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); > - > - ret = cdev_add(&ctrldev->cdev, dev->devt, 1); > - if (ret) > - goto free_ctrl_ida; > - > - /* We can now rely on the release function for cleanup */ > - dev->release = rpmsg_ctrldev_release_device; > - > - ret = device_add(dev); > - if (ret) { > - dev_err(&rpdev->dev, "device_add failed: %d\n", ret); > - put_device(dev); > - } > - > - dev_set_drvdata(&rpdev->dev, ctrldev); > - > - return ret; > - > -free_ctrl_ida: > - ida_simple_remove(&rpmsg_ctrl_ida, dev->id); > -free_minor_ida: > - ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); > -free_ctrldev: > - put_device(dev); > - kfree(ctrldev); > - > - return ret; > -} > - > -static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) > -{ > - struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); > - int ret; > - > - /* Destroy all endpoints */ > - ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_destroy_eptdev); > - if (ret) > - dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); > - > - device_del(&ctrldev->dev); > - put_device(&ctrldev->dev); > -} > - > -static struct rpmsg_driver rpmsg_chrdev_driver = { > - .probe = rpmsg_chrdev_probe, > - .remove = rpmsg_chrdev_remove, > - .drv = { > - .name = "rpmsg_chrdev", > - }, > -}; > - > static int rpmsg_chrdev_init(void) > { > int ret; > > ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); To avoid any confusion I would put "rpmsg_char"... And I don't think it changes anything for users. > - if (ret < 0) { > + if (ret < 0) > pr_err("rpmsg: failed to allocate char dev region\n"); > - return ret; > - } > - > - rpmsg_class = class_create(THIS_MODULE, "rpmsg"); > - if (IS_ERR(rpmsg_class)) { > - pr_err("failed to create rpmsg class\n"); > - unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); > - return PTR_ERR(rpmsg_class); > - } > - > - ret = register_rpmsg_driver(&rpmsg_chrdev_driver); > - if (ret < 0) { > - pr_err("rpmsgchr: failed to register rpmsg driver\n"); > - class_destroy(rpmsg_class); > - unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); > - } > > return ret; > } > @@ -579,8 +406,6 @@ postcore_initcall(rpmsg_chrdev_init); > > static void rpmsg_chrdev_exit(void) > { > - unregister_rpmsg_driver(&rpmsg_chrdev_driver); > - class_destroy(rpmsg_class); > unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); > } > module_exit(rpmsg_chrdev_exit); > diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c > new file mode 100644 > index 000000000000..e203ecc18120 > --- /dev/null > +++ b/drivers/rpmsg/rpmsg_ctrl.c > @@ -0,0 +1,233 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2021, STMicroelectronics > + * Copyright (c) 2016, Linaro Ltd. > + * Copyright (c) 2012, Michal Simek <monstr@xxxxxxxxx> > + * 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. > + */ > +#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/slab.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; > +struct class *rpmsg_class; > + > +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 > + */ > +struct rpmsg_ctrldev { > + struct rpmsg_device *rpdev; > + struct cdev cdev; > + struct device dev; > +}; > + > +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; > + > + if (cmd != RPMSG_CREATE_EPT_IOCTL) > + return -EINVAL; > + > + 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; > + > + return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, &ctrldev->dev, chinfo, rpmsg_class); > +}; > + > +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_simple_remove(&rpmsg_ctrl_ida, dev->id); > + ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); > + cdev_del(&ctrldev->cdev); > + kfree(ctrldev); > +} > + > +static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev) > +{ > + struct rpmsg_ctrldev *ctrldev; > + struct device *dev; > + int ret; > + > + ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); > + if (!ctrldev) > + return -ENOMEM; > + > + ctrldev->rpdev = rpdev; > + > + dev = &ctrldev->dev; > + device_initialize(dev); > + dev->parent = &rpdev->dev; > + dev->class = rpmsg_class; > + > + cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); > + ctrldev->cdev.owner = THIS_MODULE; > + > + ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); > + if (ret < 0) > + goto free_ctrldev; > + dev->devt = MKDEV(MAJOR(rpmsg_major), ret); > + > + ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); > + if (ret < 0) > + goto free_minor_ida; > + dev->id = ret; > + dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); > + > + ret = cdev_add(&ctrldev->cdev, dev->devt, 1); > + if (ret) > + goto free_ctrl_ida; > + > + /* We can now rely on the release function for cleanup */ > + dev->release = rpmsg_ctrldev_release_device; > + > + ret = device_add(dev); > + if (ret) { > + dev_err(&rpdev->dev, "device_add failed: %d\n", ret); > + put_device(dev); > + } > + > + dev_set_drvdata(&rpdev->dev, ctrldev); > + > + return ret; > + > +free_ctrl_ida: > + ida_simple_remove(&rpmsg_ctrl_ida, dev->id); > +free_minor_ida: > + ida_simple_remove(&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; > + > + /* Destroy all endpoints */ > + ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_destroy_eptdev); > + if (ret) > + dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); > + > + device_del(&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", With this change rpmsg_chrdev_register_device() will fail to find a driver to work with, something that will break the Glink/SMD code if someone tries a bisect. Things will work out just fine if you move this to patch 3. > + }, > +}; > + > +static int rpmsg_ctrldev_init(void) > +{ > + int ret; > + > + ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); And here I'd go with "rpmsg_ctrl". > + if (ret < 0) { > + pr_err("rpmsg: failed to allocate char dev region\n"); > + return ret; > + } > + > + rpmsg_class = class_create(THIS_MODULE, "rpmsg"); > + if (IS_ERR(rpmsg_class)) { > + pr_err("failed to create rpmsg class\n"); > + ret = PTR_ERR(rpmsg_class); > + goto free_region; > + } > + > + ret = register_rpmsg_driver(&rpmsg_ctrldev_driver); > + if (ret < 0) { > + pr_err("rpmsg ctrl: failed to register rpmsg driver\n"); > + goto free_class; > + } > + > + return 0; > + > +free_class: > + class_destroy(rpmsg_class); > +free_region: > + 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); > + class_destroy(rpmsg_class); > + 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"); > -- > 2.17.1 >
