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rpmsg: char: Add RPMSG GET/SET FLOWCONTROL IOCTL support

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Add RPMSG_GET_OUTGOING_FLOWCONTROL and RPMSG_SET_INCOMING_FLOWCONTROL
IOCTL support for rpmsg char device nodes to get/set the low level
transport signals.

Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Deepak Kumar Singh <quic_deesin@quicinc.com>
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/1688679698-31274-4-git-send-email-quic_sarannya@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Chris Lew 2023-07-07 03:11:38 +05:30 committed by Bjorn Andersson
parent a2b73aa512
commit 5550201c0f
2 changed files with 58 additions and 6 deletions
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54
drivers/rpmsg/rpmsg_char.c
View file

@ -52,6 +52,8 @@ static DEFINE_IDA(rpmsg_minor_ida);
* @readq: wait object for incoming queue
* @default_ept: set to channel default endpoint if the default endpoint should be re-used
* on device open to prevent endpoint address update.
* remote_flow_restricted: to indicate if the remote has requested for flow to be limited
* remote_flow_updated: to indicate if the flow control has been requested
*/
struct rpmsg_eptdev {
struct device dev;
@ -68,6 +70,8 @@ struct rpmsg_eptdev {
struct sk_buff_head queue;
wait_queue_head_t readq;
bool remote_flow_restricted;
bool remote_flow_updated;
};
int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
@ -116,6 +120,18 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
return 0;
}
static int rpmsg_ept_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable)
{
struct rpmsg_eptdev *eptdev = priv;
eptdev->remote_flow_restricted = enable;
eptdev->remote_flow_updated = true;
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);
@ -152,6 +168,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
return -EINVAL;
}
ept->flow_cb = rpmsg_ept_flow_cb;
eptdev->ept = ept;
filp->private_data = eptdev;
mutex_unlock(&eptdev->ept_lock);
@ -172,6 +189,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
eptdev->ept = NULL;
}
mutex_unlock(&eptdev->ept_lock);
eptdev->remote_flow_updated = false;
/* Discard all SKBs */
skb_queue_purge(&eptdev->queue);
@ -285,6 +303,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
if (!skb_queue_empty(&eptdev->queue))
mask |= EPOLLIN | EPOLLRDNORM;
if (eptdev->remote_flow_updated)
mask |= EPOLLPRI;
mutex_lock(&eptdev->ept_lock);
mask |= rpmsg_poll(eptdev->ept, filp, wait);
mutex_unlock(&eptdev->ept_lock);
@ -297,14 +318,35 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
{
struct rpmsg_eptdev *eptdev = fp->private_data;
if (cmd != RPMSG_DESTROY_EPT_IOCTL)
return -EINVAL;
bool set;
int ret;
/* Don't allow to destroy a default endpoint. */
if (eptdev->default_ept)
return -EINVAL;
switch (cmd) {
case RPMSG_GET_OUTGOING_FLOWCONTROL:
eptdev->remote_flow_updated = false;
ret = put_user(eptdev->remote_flow_restricted, (int __user *)arg);
break;
case RPMSG_SET_INCOMING_FLOWCONTROL:
if (arg > 1) {
ret = -EINVAL;
break;
}
set = !!arg;
ret = rpmsg_set_flow_control(eptdev->ept, set, eptdev->chinfo.dst);
break;
case RPMSG_DESTROY_EPT_IOCTL:
/* Don't allow to destroy a default endpoint. */
if (eptdev->default_ept) {
ret = -EINVAL;
break;
}
ret = rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
break;
default:
ret = -EINVAL;
}
return rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL);
return ret;
}
static const struct file_operations rpmsg_eptdev_fops = {

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

@ -43,4 +43,14 @@ struct rpmsg_endpoint_info {
*/
#define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info)
/**
* Get the flow control state of the remote rpmsg char device.
*/
#define RPMSG_GET_OUTGOING_FLOWCONTROL _IOR(0xb5, 0x5, int)
/**
* Set the flow control state of the local rpmsg char device.
*/
#define RPMSG_SET_INCOMING_FLOWCONTROL _IOR(0xb5, 0x6, int)
#endif