From: Arun Kumar Neelakantam <aneela@codeaurora.org>
To: ohad@wizery.com, bjorn.andersson@linaro.org, clew@codeaurora.org,
sricharan@codeaurora.org
Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
Arun Kumar Neelakantam <aneela@codeaurora.org>
Subject: [PATCH V4 4/4] rpmsg: char: Add signal callback and POLLPRI support
Date: Mon, 8 Oct 2018 12:08:18 +0530 [thread overview]
Message-ID: <1538980699-21516-5-git-send-email-aneela@codeaurora.org> (raw)
In-Reply-To: <1538980699-21516-1-git-send-email-aneela@codeaurora.org>
Register a callback to get the signal notifications from rpmsg and
send POLLPRI mask to indicate the signal change in POLL system call.
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
---
drivers/rpmsg/rpmsg_char.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index b136684..8a3cbe9 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -64,6 +64,7 @@ struct rpmsg_ctrldev {
* @queue_lock: synchronization of @queue operations
* @queue: incoming message queue
* @readq: wait object for incoming queue
+ * @sig_pending:state of signal notification
*/
struct rpmsg_eptdev {
struct device dev;
@@ -78,6 +79,8 @@ struct rpmsg_eptdev {
spinlock_t queue_lock;
struct sk_buff_head queue;
wait_queue_head_t readq;
+
+ bool sig_pending;
};
static int rpmsg_eptdev_destroy(struct device *dev, void *data)
@@ -122,6 +125,18 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
return 0;
}
+static int rpmsg_sigs_cb(struct rpmsg_device *rpdev, void *priv,
+ u32 old, u32 new)
+{
+ struct rpmsg_eptdev *eptdev = priv;
+
+ eptdev->sig_pending = true;
+
+ /* wake up any blocking processes, waiting for signal notification */
+ wake_up_interruptible(&eptdev->readq);
+ return 0;
+}
+
static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
{
struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev);
@@ -138,6 +153,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
return -EINVAL;
}
+ ept->sig_cb = rpmsg_sigs_cb;
eptdev->ept = ept;
filp->private_data = eptdev;
@@ -157,6 +173,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
eptdev->ept = NULL;
}
mutex_unlock(&eptdev->ept_lock);
+ eptdev->sig_pending = false;
/* Discard all SKBs */
while (!skb_queue_empty(&eptdev->queue)) {
@@ -263,6 +280,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
if (!skb_queue_empty(&eptdev->queue))
mask |= EPOLLIN | EPOLLRDNORM;
+ if (eptdev->sig_pending)
+ mask |= POLLPRI;
+
mask |= rpmsg_poll(eptdev->ept, filp, wait);
return mask;
@@ -306,6 +326,7 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
switch (cmd) {
case TIOCMGET:
+ eptdev->sig_pending = false;
ret = rpmsg_get_signals(eptdev->ept);
if (ret >= 0)
ret = put_user(ret, (int __user *)arg);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2018-10-08 6:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-08 6:38 [PATCH V4 0/4] Add TIOCM Signals support for RPMSG char devices Arun Kumar Neelakantam
2018-10-08 6:38 ` [PATCH V4 1/4] rpmsg: core: Add signal API support Arun Kumar Neelakantam
2018-10-08 6:38 ` [PATCH V4 2/4] rpmsg: glink: Add support to handle signals command Arun Kumar Neelakantam
2018-10-08 6:38 ` [PATCH V4 3/4] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support Arun Kumar Neelakantam
2018-10-08 6:38 ` Arun Kumar Neelakantam [this message]
2018-10-08 13:08 ` [PATCH V4 0/4] Add TIOCM Signals support for RPMSG char devices Arnaud Pouliquen
2018-10-08 16:23 ` Bjorn Andersson
2018-10-09 16:02 ` Arnaud Pouliquen
2018-10-09 18:27 ` Bjorn Andersson
2018-10-12 9:46 ` Arnaud Pouliquen
2020-05-13 5:11 [RESEND PATCH " Arun Kumar Neelakantam
2020-05-13 5:11 ` [PATCH V4 4/4] rpmsg: char: Add signal callback and POLLPRI support Arun Kumar Neelakantam
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