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Message-Id: <1472768889-3906-7-git-send-email-bjorn.andersson@linaro.org>
Date: Thu, 1 Sep 2016 15:27:58 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Ohad Ben-Cohen <ohad@...ery.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: linux-remoteproc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/17] rpmsg: Introduce indirection table for rpmsg_device operations
To allow for multiple backend implementations add an indireection table
for rpmsg_device related operations and move the virtio implementation
behind this table.
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
Per Loic's comment I did consider adding parameter validation to the exposed
functions in this patch, but as the previous implementation did not gracefully
handle bad input parameters I decided to defer this until after this series has
been merged.
Changes since v1:
- Split table in device vs endpoint
- Moved ops pointer to the public structs to reduce code clutter
- Kerneldoc for rpmsg_device_ops
drivers/rpmsg/virtio_rpmsg_bus.c | 48 +++++++++++++++++++++++++++++++++++-----
include/linux/rpmsg.h | 23 +++++++++++++++++++
2 files changed, 65 insertions(+), 6 deletions(-)
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 1ac9fd871760..088203ed1df8 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -286,10 +286,18 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
rpmsg_rx_cb_t cb, void *priv,
struct rpmsg_channel_info chinfo)
{
- return __rpmsg_create_ept(rpdev->vrp, rpdev, cb, priv, chinfo.src);
+ return rpdev->ops->create_ept(rpdev, cb, priv, chinfo);
}
EXPORT_SYMBOL(rpmsg_create_ept);
+static struct rpmsg_endpoint *virtio_rpmsg_create_ept(struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb,
+ void *priv,
+ struct rpmsg_channel_info chinfo)
+{
+ return __rpmsg_create_ept(rpdev->vrp, rpdev, cb, priv, chinfo.src);
+}
+
/**
* __rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
* @vrp: virtproc which owns this ept
@@ -341,7 +349,6 @@ static int rpmsg_dev_probe(struct device *dev)
{
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
- struct virtproc_info *vrp = rpdev->vrp;
struct rpmsg_channel_info chinfo = {};
struct rpmsg_endpoint *ept;
int err;
@@ -367,6 +374,18 @@ static int rpmsg_dev_probe(struct device *dev)
goto out;
}
+ if (rpdev->ops->announce_create)
+ err = rpdev->ops->announce_create(rpdev);
+out:
+ return err;
+}
+
+static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
+{
+ struct virtproc_info *vrp = rpdev->vrp;
+ struct device *dev = &rpdev->dev;
+ int err = 0;
+
/* need to tell remote processor's name service about this channel ? */
if (rpdev->announce &&
virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
@@ -381,15 +400,13 @@ static int rpmsg_dev_probe(struct device *dev)
dev_err(dev, "failed to announce service %d\n", err);
}
-out:
return err;
}
-static int rpmsg_dev_remove(struct device *dev)
+static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
{
- struct rpmsg_device *rpdev = to_rpmsg_device(dev);
- struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
struct virtproc_info *vrp = rpdev->vrp;
+ struct device *dev = &rpdev->dev;
int err = 0;
/* tell remote processor's name service we're removing this channel */
@@ -406,6 +423,18 @@ static int rpmsg_dev_remove(struct device *dev)
dev_err(dev, "failed to announce service %d\n", err);
}
+ return err;
+}
+
+static int rpmsg_dev_remove(struct device *dev)
+{
+ struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+ struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
+ int err = 0;
+
+ if (rpdev->ops->announce_destroy)
+ err = rpdev->ops->announce_destroy(rpdev);
+
rpdrv->remove(rpdev);
rpmsg_destroy_ept(rpdev->ept);
@@ -479,6 +508,12 @@ static int rpmsg_device_match(struct device *dev, void *data)
return 1;
}
+static const struct rpmsg_device_ops virtio_rpmsg_ops = {
+ .create_ept = virtio_rpmsg_create_ept,
+ .announce_create = virtio_rpmsg_announce_create,
+ .announce_destroy = virtio_rpmsg_announce_destroy,
+};
+
/*
* create an rpmsg channel using its name and address info.
* this function will be used to create both static and dynamic
@@ -508,6 +543,7 @@ static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp,
rpdev->vrp = vrp;
rpdev->src = chinfo->src;
rpdev->dst = chinfo->dst;
+ rpdev->ops = &virtio_rpmsg_ops;
/*
* rpmsg server channels has predefined local address (for now),
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 35a0f39fd09b..9fdcfc7c7837 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -96,6 +96,8 @@ enum rpmsg_ns_flags {
#define RPMSG_ADDR_ANY 0xFFFFFFFF
struct virtproc_info;
+struct rpmsg_endpoint;
+struct rpmsg_device_ops;
/**
* struct rpmsg_channel_info - channel info representation
@@ -127,11 +129,32 @@ struct rpmsg_device {
u32 dst;
struct rpmsg_endpoint *ept;
bool announce;
+
+ const struct rpmsg_device_ops *ops;
};
typedef void (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
/**
+ * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
+ * @create_ept: create backend-specific endpoint, requried
+ * @announce_create: announce presence of new channel, optional
+ * @announce_destroy: announce destruction of channel, optional
+ *
+ * Indirection table for the operations that a rpmsg backend should implement.
+ * @announce_create and @announce_destroy are optional as the backend might
+ * advertise new channels implicitly by creating the endpoints.
+ */
+struct rpmsg_device_ops {
+ struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
+ rpmsg_rx_cb_t cb, void *priv,
+ struct rpmsg_channel_info chinfo);
+
+ int (*announce_create)(struct rpmsg_device *ept);
+ int (*announce_destroy)(struct rpmsg_device *ept);
+};
+
+/**
* struct rpmsg_endpoint - binds a local rpmsg address to its user
* @rpdev: rpmsg channel device
* @refcount: when this drops to zero, the ept is deallocated
--
2.5.0
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