linux-kernel - [RFC PATCH 03/10] rpmsg: core: Add rpmsg device remote flow control announcement ops

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Date:   Fri, 20 May 2022 10:29:33 +0200
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Deepak Kumar Singh <quic_deesin@...cinc.com>,
        Chris Lew <quic_clew@...cinc.com>,
        <arnaud.pouliquen@...s.st.com>
Subject: [RFC PATCH 03/10] rpmsg: core: Add rpmsg device remote flow control announcement ops

This ops is called by the rpmsg flow control service to inform
a rpmsg local device of a remote endpoint flow control state.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/rpmsg/rpmsg_core.c     | 24 ++++++++++++++++++++++++
 drivers/rpmsg/rpmsg_internal.h |  7 +++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index 8de8aadd9b27..6bbc3b3ace50 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -67,6 +67,30 @@ int rpmsg_release_channel(struct rpmsg_device *rpdev,
 }
 EXPORT_SYMBOL(rpmsg_release_channel);
 
+/**
+ * rpmsg_channel_remote_fc() - announce remote endpoint flow control state
+ * using source and destination endpoint address info.
+ * @rpdev: rpmsg device
+ * @chinfo: channel_info
+ * @enable: state of the remote endpoint
+ *
+ * Return: 0 on success or an appropriate error value.
+ */
+int rpmsg_channel_remote_fc(struct rpmsg_device *rpdev,
+			    struct rpmsg_channel_info *chinfo,
+			    bool enable)
+{
+	if (WARN_ON(!rpdev))
+		return -EINVAL;
+	if (!rpdev->ops || !rpdev->ops->announce_remote_fc) {
+		dev_err(&rpdev->dev, "no flow control ops found\n");
+		return -ENXIO;
+	}
+
+	return rpdev->ops->announce_remote_fc(rpdev, chinfo, enable);
+}
+EXPORT_SYMBOL(rpmsg_channel_remote_fc);
+
 /**
  * rpmsg_create_ept() - create a new rpmsg_endpoint
  * @rpdev: rpmsg channel device
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index 4ce58e68af30..44e2c0f2f5ea 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -43,6 +43,9 @@ struct rpmsg_device_ops {
 
 	int (*announce_create)(struct rpmsg_device *ept);
 	int (*announce_destroy)(struct rpmsg_device *ept);
+	int (*announce_remote_fc)(struct rpmsg_device *rpdev,
+				  struct rpmsg_channel_info *chinfo,
+				  bool enable);
 };
 
 /**
@@ -87,6 +90,10 @@ struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev,
 					  struct rpmsg_channel_info *chinfo);
 int rpmsg_release_channel(struct rpmsg_device *rpdev,
 			  struct rpmsg_channel_info *chinfo);
+
+int rpmsg_channel_remote_fc(struct rpmsg_device *rpdev,
+			    struct rpmsg_channel_info *chinfo,
+			    bool enable);
 /**
  * rpmsg_ctrldev_register_device() - register a char device for control based on rpdev
  * @rpdev:	prepared rpdev to be used for creating endpoints
-- 
2.25.1