[PATCH v7 2/8] rpmsg: virtio: Move from virtio to rpmsg byte conversion

Mathieu Poirier
2020-11-20T21:43:13Z

Use rpmsg byte conversion functions in order for the RPMSG
headers and generic functions to be used by external entities.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
drivers/rpmsg/virtio_rpmsg_bus.c | 53 +++++++++++++++++---------------
1 file changed, 28 insertions(+), 25 deletions(-)

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 7d7ed4e5cce7..5259fbbc8e68 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -19,11 +19,11 @@
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/rpmsg.h>
+#include <linux/rpmsg/byteorder.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/virtio.h>
-#include <linux/virtio_byteorder.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include <linux/wait.h>
@@ -85,11 +85,11 @@ struct virtproc_info {
* Every message sent(/received) on the rpmsg bus begins with this header.
*/
struct rpmsg_hdr {
- __virtio32 src;
- __virtio32 dst;
- __virtio32 reserved;
- __virtio16 len;
- __virtio16 flags;
+ __rpmsg32 src;
+ __rpmsg32 dst;
+ __rpmsg32 reserved;
+ __rpmsg16 len;
+ __rpmsg16 flags;
u8 data[];
} __packed;

@@ -107,8 +107,8 @@ struct rpmsg_hdr {
*/
struct rpmsg_ns_msg {
char name[RPMSG_NAME_SIZE];
- __virtio32 addr;
- __virtio32 flags;
+ __rpmsg32 addr;
+ __rpmsg32 flags;
} __packed;

/**
@@ -341,8 +341,8 @@ static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
struct rpmsg_ns_msg nsm;

strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
- nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr);
- nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_CREATE);
+ nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr);
+ nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_CREATE);

err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
if (err)
@@ -365,8 +365,8 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
struct rpmsg_ns_msg nsm;

strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
- nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr);
- nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_DESTROY);
+ nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr);
+ nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_DESTROY);

err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
if (err)
@@ -425,6 +425,7 @@ static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp,
rpdev->src = chinfo->src;
rpdev->dst = chinfo->dst;
rpdev->ops = &virtio_rpmsg_ops;
+ rpdev->little_endian = virtio_is_little_endian(vrp->vdev);

/*
* rpmsg server channels has predefined local address (for now),
@@ -618,10 +619,10 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
}
}

- msg->len = cpu_to_virtio16(vrp->vdev, len);
+ msg->len = cpu_to_rpmsg16(rpdev, len);
msg->flags = 0;
- msg->src = cpu_to_virtio32(vrp->vdev, src);
- msg->dst = cpu_to_virtio32(vrp->vdev, dst);
+ msg->src = cpu_to_rpmsg32(rpdev, src);
+ msg->dst = cpu_to_rpmsg32(rpdev, dst);
msg->reserved = 0;
memcpy(msg->data, data, len);

@@ -710,14 +711,15 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
{
struct rpmsg_endpoint *ept;
struct scatterlist sg;
- unsigned int msg_len = virtio16_to_cpu(vrp->vdev, msg->len);
+ bool little_endian = virtio_is_little_endian(vrp->vdev);
+ unsigned int msg_len = __rpmsg16_to_cpu(little_endian, msg->len);
int err;

dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
- virtio32_to_cpu(vrp->vdev, msg->src),
- virtio32_to_cpu(vrp->vdev, msg->dst), msg_len,
- virtio16_to_cpu(vrp->vdev, msg->flags),
- virtio32_to_cpu(vrp->vdev, msg->reserved));
+ __rpmsg32_to_cpu(little_endian, msg->src),
+ __rpmsg32_to_cpu(little_endian, msg->dst), msg_len,
+ __rpmsg16_to_cpu(little_endian, msg->flags),
+ __rpmsg32_to_cpu(little_endian, msg->reserved));
#if defined(CONFIG_DYNAMIC_DEBUG)
dynamic_hex_dump("rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
msg, sizeof(*msg) + msg_len, true);
@@ -736,7 +738,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
/* use the dst addr to fetch the callback of the appropriate user */
mutex_lock(&vrp->endpoints_lock);

- ept = idr_find(&vrp->endpoints, virtio32_to_cpu(vrp->vdev, msg->dst));
+ ept = idr_find(&vrp->endpoints, __rpmsg32_to_cpu(little_endian, msg->dst));

/* let's make sure no one deallocates ept while we use it */
if (ept)
@@ -750,7 +752,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,

if (ept->cb)
ept->cb(ept->rpdev, msg->data, msg_len, ept->priv,
- virtio32_to_cpu(vrp->vdev, msg->src));
+ __rpmsg32_to_cpu(little_endian, msg->src));

mutex_unlock(&ept->cb_lock);

@@ -830,6 +832,7 @@ static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
struct rpmsg_channel_info chinfo;
struct virtproc_info *vrp = priv;
struct device *dev = &vrp->vdev->dev;
+ bool little_endian = virtio_is_little_endian(vrp->vdev);
int ret;

#if defined(CONFIG_DYNAMIC_DEBUG)
@@ -858,13 +861,13 @@ static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,

strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
chinfo.src = RPMSG_ADDR_ANY;
- chinfo.dst = virtio32_to_cpu(vrp->vdev, msg->addr);
+ chinfo.dst = __rpmsg32_to_cpu(little_endian, msg->addr);

dev_info(dev, "%sing channel %s addr 0x%x\n",
- virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY ?
+ __rpmsg32_to_cpu(little_endian, msg->flags) & RPMSG_NS_DESTROY ?
"destroy" : "creat", msg->name, chinfo.dst);

- if (virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY) {
+ if (__rpmsg32_to_cpu(little_endian, msg->flags) & RPMSG_NS_DESTROY) {
ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo);
if (ret)
dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
--
2.25.1