The rpmsg_send() operations has been taking a rpmsg_device, but this
forces users of secondary rpmsg_endpoints to use the rpmsg_sendto()
interface - by extracting source and destination from the given data
structures. If we instead pass the rpmsg_endpoint to these functions a
service can use rpmsg_sendto() to respond to messages, even on secondary
endpoints.
In addition this would allow us to support operations on multiple
channels in future backends that does not support off-channel
operations.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
drivers/rpmsg/virtio_rpmsg_bus.c | 4 +--
include/linux/rpmsg.h | 70 +++++++++++++++++++++++-----------------
2 files changed, 42 insertions(+), 32 deletions(-)
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index c4bd89ea7681..1b63f4b7c2bd 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -382,7 +382,7 @@ static int rpmsg_dev_probe(struct device *dev)
nsm.addr = rpdev->src;
nsm.flags = RPMSG_NS_CREATE;
- err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
if (err)
dev_err(dev, "failed to announce service %d\n", err);
}
@@ -407,7 +407,7 @@ static int rpmsg_dev_remove(struct device *dev)
nsm.addr = rpdev->src;
nsm.flags = RPMSG_NS_DESTROY;
- err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
if (err)
dev_err(dev, "failed to announce service %d\n", err);
}
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 2b97c711a5e3..88e302c011e6 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -193,13 +193,14 @@ rpmsg_send_offchannel_raw(struct rpmsg_channel *, u32, u32, void *, int, bool);
/**
* rpmsg_send() - send a message across to the remote processor
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @data: payload of message
* @len: length of payload
*
- * This function sends @data of length @len on the @rpdev channel.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to, using @rpdev's source and destination addresses.
+ * This function sends @data of length @len on the @ept endpoint.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to, using @ept's address and its associated rpmsg
+ * device destination addresses.
* In case there are no TX buffers available, the function will block until
* one becomes available, or a timeout of 15 seconds elapses. When the latter
* happens, -ERESTARTSYS is returned.
@@ -208,23 +209,24 @@ rpmsg_send_offchannel_raw(struct rpmsg_channel *, u32, u32, void *, int, bool);
*
* Returns 0 on success and an appropriate error value on failure.
*/
-static inline int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len)
+static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
{
- u32 src = rpdev->src, dst = rpdev->dst;
+ struct rpmsg_channel *rpdev = ept->rpdev;
+ u32 src = ept->addr, dst = rpdev->dst;
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
}
/**
* rpmsg_sendto() - send a message across to the remote processor, specify dst
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @data: payload of message
* @len: length of payload
* @dst: destination address
*
* This function sends @data of length @len to the remote @dst address.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to, using @rpdev's source address.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to, using @ept's address as source.
* In case there are no TX buffers available, the function will block until
* one becomes available, or a timeout of 15 seconds elapses. When the latter
* happens, -ERESTARTSYS is returned.
@@ -234,16 +236,17 @@ static inline int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len)
* Returns 0 on success and an appropriate error value on failure.
*/
static inline
-int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
+int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
{
- u32 src = rpdev->src;
+ struct rpmsg_channel *rpdev = ept->rpdev;
+ u32 src = ept->addr;
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
}
/**
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @src: source address
* @dst: destination address
* @data: payload of message
@@ -251,8 +254,8 @@ int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
*
* This function sends @data of length @len to the remote @dst address,
* and uses @src as the source address.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to.
* In case there are no TX buffers available, the function will block until
* one becomes available, or a timeout of 15 seconds elapses. When the latter
* happens, -ERESTARTSYS is returned.
@@ -262,21 +265,24 @@ int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
* Returns 0 on success and an appropriate error value on failure.
*/
static inline
-int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
+int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
void *data, int len)
{
+ struct rpmsg_channel *rpdev = ept->rpdev;
+
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, true);
}
/**
* rpmsg_send() - send a message across to the remote processor
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @data: payload of message
* @len: length of payload
*
- * This function sends @data of length @len on the @rpdev channel.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to, using @rpdev's source and destination addresses.
+ * This function sends @data of length @len on the @ept endpoint.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to, using @ept's addres as source and its associated
+ * rpdev's address as destination.
* In case there are no TX buffers available, the function will immediately
* return -ENOMEM without waiting until one becomes available.
*
@@ -285,23 +291,24 @@ int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
* Returns 0 on success and an appropriate error value on failure.
*/
static inline
-int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len)
+int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
{
- u32 src = rpdev->src, dst = rpdev->dst;
+ struct rpmsg_channel *rpdev = ept->rpdev;
+ u32 src = ept->addr, dst = rpdev->dst;
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
}
/**
* rpmsg_sendto() - send a message across to the remote processor, specify dst
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @data: payload of message
* @len: length of payload
* @dst: destination address
*
* This function sends @data of length @len to the remote @dst address.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to, using @rpdev's source address.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to, using @ept's address as source.
* In case there are no TX buffers available, the function will immediately
* return -ENOMEM without waiting until one becomes available.
*
@@ -310,16 +317,17 @@ int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len)
* Returns 0 on success and an appropriate error value on failure.
*/
static inline
-int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
{
- u32 src = rpdev->src;
+ struct rpmsg_channel *rpdev = ept->rpdev;
+ u32 src = ept->addr;
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
}
/**
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
- * @rpdev: the rpmsg channel
+ * @ept: the rpmsg endpoint
* @src: source address
* @dst: destination address
* @data: payload of message
@@ -327,8 +335,8 @@ int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
*
* This function sends @data of length @len to the remote @dst address,
* and uses @src as the source address.
- * The message will be sent to the remote processor which the @rpdev
- * channel belongs to.
+ * The message will be sent to the remote processor which the @ept
+ * endpoint belongs to.
* In case there are no TX buffers available, the function will immediately
* return -ENOMEM without waiting until one becomes available.
*
@@ -337,9 +345,11 @@ int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst)
* Returns 0 on success and an appropriate error value on failure.
*/
static inline
-int rpmsg_trysend_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst,
+int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
void *data, int len)
{
+ struct rpmsg_channel *rpdev = ept->rpdev;
+
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
}
--
2.5.0
--
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