linux-kernel - [PATCH v5 12/16] rpmsg: ctrl: introduce RPMSG_CREATE_DEV

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Date:   Fri, 19 Feb 2021 12:14:57 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andy Gross <agross@...nel.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-msm@...r.kernel.org>, <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v5 12/16] rpmsg: ctrl: introduce RPMSG_CREATE_DEV_IOCTL

Implement the RPMSG_CREATE_DEV_IOCTL to allow the user application to
initiate a communication through a new RPMsg channel.
This Ioctl can be used to instantiate a local RPMsg device.
Depending on the back-end implementation, a NS announcement can be sent
to the remote processor.

Suggested-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/rpmsg/rpmsg_ctrl.c | 21 +++++++++++++++++----
 include/uapi/linux/rpmsg.h |  5 +++++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index 2e43b4096aa8..78c13816bfc6 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -70,9 +70,7 @@ static long rpmsg_ctrl_ioctl(struct file *fp, unsigned int cmd, unsigned long ar
 	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 *newch;
 
 	if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))
 		return -EFAULT;
@@ -82,7 +80,22 @@ static long rpmsg_ctrl_ioctl(struct file *fp, unsigned int cmd, unsigned long ar
 	chinfo.src = eptinfo.src;
 	chinfo.dst = eptinfo.dst;
 
-	return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, &ctrldev->dev, chinfo);
+	switch (cmd) {
+	case RPMSG_CREATE_EPT_IOCTL:
+		return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, &ctrldev->dev, chinfo);
+
+	case RPMSG_CREATE_DEV_IOCTL:
+		newch = rpmsg_create_channel(ctrldev->rpdev, &chinfo);
+		if (!newch) {
+			dev_err(&ctrldev->dev, "rpmsg_create_channel failed\n");
+			return -ENXIO;
+		}
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+
 };
 
 static const struct file_operations rpmsg_ctrl_fops = {
diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
index f5ca8740f3fb..f9d5a74e7801 100644
--- a/include/uapi/linux/rpmsg.h
+++ b/include/uapi/linux/rpmsg.h
@@ -33,4 +33,9 @@ struct rpmsg_endpoint_info {
  */
 #define RPMSG_DESTROY_EPT_IOCTL	_IO(0xb5, 0x2)
 
+/**
+ * Instantiate a rpmsg service device.
+ */
+#define RPMSG_CREATE_DEV_IOCTL	_IOW(0xb5, 0x3, struct rpmsg_endpoint_info)
+
 #endif
-- 
2.17.1