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rpmsg: core: Add signal API support

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Some transports like Glink support the state notifications between
clients using flow control signals similar to serial protocol signals.
Local glink client drivers can send and receive flow control status
to glink clients running on remote processors.

Add APIs to support sending and receiving of flow control status by
rpmsg clients.

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/1688679698-31274-2-git-send-email-quic_sarannya@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Deepak Kumar Singh
2023-07-07 03:11:36 +05:30
committed by Bjorn Andersson
parent 06c2afb862
commit 8ce49c2a2a
3 changed files with 38 additions and 0 deletions
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21
drivers/rpmsg/rpmsg_core.c
View File

@@ -330,6 +330,25 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
}
EXPORT_SYMBOL(rpmsg_trysend_offchannel);
/**
* rpmsg_set_flow_control() - request remote to pause/resume transmission
* @ept: the rpmsg endpoint
* @pause: pause transmission
* @dst: destination address of the endpoint
*
* Return: 0 on success and an appropriate error value on failure.
*/
int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool pause, u32 dst)
{
if (WARN_ON(!ept))
return -EINVAL;
if (!ept->ops->set_flow_control)
return -EOPNOTSUPP;
return ept->ops->set_flow_control(ept, pause, dst);
}
EXPORT_SYMBOL_GPL(rpmsg_set_flow_control);
/**
* rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
* @ept: the rpmsg endpoint
@@ -539,6 +558,8 @@ static int rpmsg_dev_probe(struct device *dev)
rpdev->ept = ept;
rpdev->src = ept->addr;
ept->flow_cb = rpdrv->flowcontrol;
}
err = rpdrv->probe(rpdev);

2
drivers/rpmsg/rpmsg_internal.h
View File

@@ -55,6 +55,7 @@ struct rpmsg_device_ops {
* @trysendto: see @rpmsg_trysendto(), optional
* @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
* @poll: see @rpmsg_poll(), optional
* @set_flow_control: see @rpmsg_set_flow_control(), optional
* @get_mtu: see @rpmsg_get_mtu(), optional
*
* Indirection table for the operations that a rpmsg backend should implement.
@@ -75,6 +76,7 @@ struct rpmsg_endpoint_ops {
void *data, int len);
__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
int (*set_flow_control)(struct rpmsg_endpoint *ept, bool pause, u32 dst);
ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
};