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authorArnaud Pouliquen <arnaud.pouliquen@foss.st.com>2022-01-24 13:25:24 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2022-03-13 19:49:53 +0300
commit8109517b394e6deab5fd21cc5460e82ffed229c6 (patch)
tree6e0f07ba60d09b12811b3fe59e686a8334acdfad /drivers/rpmsg
parentbc69d10665690492421d926b1cd9a7a36bffd691 (diff)
downloadlinux-8109517b394e6deab5fd21cc5460e82ffed229c6.tar.xz
rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls
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
Diffstat (limited to 'drivers/rpmsg')
-rw-r--r--drivers/rpmsg/rpmsg_ctrl.c36
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index f43b5e4dbb4c..107da70fdbaa 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -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;