From: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
Ohad Ben-Cohen <ohad@wizery.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: <linux-remoteproc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<arnaud.pouliquen@foss.st.com>
Subject: [PATCH 1/4] rpmsg: ctrl: Introduce RPMSG_CREATE_DEV_IOCTL
Date: Fri, 4 Jun 2021 11:14:03 +0200 [thread overview]
Message-ID: <20210604091406.15901-2-arnaud.pouliquen@foss.st.com> (raw)
In-Reply-To: <20210604091406.15901-1-arnaud.pouliquen@foss.st.com>
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, the associated rpmsg driver is
probed and a NS announcement 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>
---
drivers/rpmsg/rpmsg_ctrl.c | 30 ++++++++++++++++++++++++++----
include/uapi/linux/rpmsg.h | 5 +++++
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index eeb1708548c1..4aa962df3661 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -23,6 +23,7 @@
#include <uapi/linux/rpmsg.h>
#include "rpmsg_char.h"
+#include "rpmsg_internal.h"
static dev_t rpmsg_major;
@@ -37,11 +38,13 @@ 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)
@@ -70,9 +73,8 @@ 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;
@@ -82,7 +84,26 @@ 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;
+
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&ctrldev->ctrl_lock);
+
+ return ret;
};
static const struct file_operations rpmsg_ctrldev_fops = {
@@ -119,6 +140,7 @@ static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev)
device_initialize(dev);
dev->parent = &rpdev->dev;
+ mutex_init(&ctrldev->ctrl_lock);
cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);
ctrldev->cdev.owner = THIS_MODULE;
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
next prev parent reply other threads:[~2021-06-04 9:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 9:14 [PATCH 0/4] rpmsg: ctrl: Add ability to instantiate rpmsg device locally Arnaud Pouliquen
2021-06-04 9:14 ` Arnaud Pouliquen [this message]
2021-06-15 17:53 ` [PATCH 1/4] rpmsg: ctrl: Introduce RPMSG_CREATE_DEV_IOCTL Mathieu Poirier
2021-06-16 8:12 ` Arnaud POULIQUEN
2021-06-21 9:35 ` Arnaud POULIQUEN
2021-06-04 9:14 ` [PATCH 2/4] rpmsg: ctrl: Introduce RPMSG_RELEASE_DEV_IOCTL Arnaud Pouliquen
2021-06-15 17:38 ` Mathieu Poirier
2021-06-16 8:13 ` Arnaud POULIQUEN
2021-06-04 9:14 ` [PATCH 3/4] rpmsg: ctrl: Add check on rpmsg device removability from user space Arnaud Pouliquen
2021-06-15 17:46 ` Mathieu Poirier
2021-06-16 9:30 ` Arnaud POULIQUEN
2021-06-16 17:15 ` Mathieu Poirier
2021-06-17 8:02 ` Arnaud POULIQUEN
2021-06-17 16:55 ` Arnaud POULIQUEN
2021-06-17 16:56 ` Mathieu Poirier
2021-06-04 9:14 ` [PATCH 4/4] rpmsg: Add a removable attribute to the rpmsg device Arnaud Pouliquen
2021-06-15 17:48 ` Mathieu Poirier
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