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rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls

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Allow the user space application to create and release an rpmsg device
by adding RPMSG_CREATE_DEV_IOCTL and RPMSG_RELEASE_DEV_IOCTL ioctrls to
the /dev/rpmsg_ctrl interface

The RPMSG_CREATE_DEV_IOCTL Ioctl can be used to instantiate a local rpmsg
device.
Depending on the back-end implementation, the associated rpmsg driver is
probed and a NS announcement can be sent to the remote processor.

The RPMSG_RELEASE_DEV_IOCTL allows the user application to release a
rpmsg device created either by the remote processor or with the
RPMSG_CREATE_DEV_IOCTL call.
Depending on the back-end implementation, the associated rpmsg driver is
removed and a NS destroy rpmsg can be sent to the remote processor.

Suggested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220124102524.295783-12-arnaud.pouliquen@foss.st.com
This commit is contained in:
Arnaud Pouliquen 2022-01-24 11:25:24 +01:00 committed by Bjorn Andersson
parent bc69d10665
commit 8109517b39
2 changed files with 42 additions and 4 deletions
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36
drivers/rpmsg/rpmsg_ctrl.c
View File

@ -43,11 +43,13 @@ static DEFINE_IDA(rpmsg_minor_ida);
* @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)
@ -76,9 +78,8 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd,
void __user *argp = (void __user *)arg;
struct rpmsg_endpoint_info eptinfo;
struct rpmsg_channel_info chinfo;
if (cmd != RPMSG_CREATE_EPT_IOCTL)
return -EINVAL;
struct rpmsg_device *rpdev;
int ret = 0;
if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))
return -EFAULT;
@ -88,7 +89,33 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd,
chinfo.src = eptinfo.src;
chinfo.dst = eptinfo.dst;
return rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo);
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 = {
@ -125,6 +152,7 @@ static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev)
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;

10
include/uapi/linux/rpmsg.h
View File

@ -33,4 +33,14 @@ struct rpmsg_endpoint_info {
*/
#define RPMSG_DESTROY_EPT_IOCTL _IO(0xb5, 0x2)
/**
* Instantiate a new local rpmsg service device.
*/
#define RPMSG_CREATE_DEV_IOCTL _IOW(0xb5, 0x3, struct rpmsg_endpoint_info)
/**
* Release a local rpmsg device.
*/
#define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info)
#endif