[PATCH v7 1/8] rpmsg: Introduce __rpmsg{16|32|64} types

Mathieu Poirier
2020-11-20T21:43:09Z

Introduce __rpmsg{16|32|64} types along with byte order conversion
functions based on an rpmsg_device operation as a foundation to
make RPMSG modular and transport agnostic.

Suggested-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
include/linux/rpmsg.h | 51 ++++++++++++++++++++++++
include/linux/rpmsg/byteorder.h | 67 ++++++++++++++++++++++++++++++++
include/uapi/linux/rpmsg_types.h | 11 ++++++
3 files changed, 129 insertions(+)
create mode 100644 include/linux/rpmsg/byteorder.h
create mode 100644 include/uapi/linux/rpmsg_types.h

diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 9fe156d1c018..faf2daff6238 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -17,6 +17,7 @@
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/poll.h>
+#include <linux/rpmsg/byteorder.h>

#define RPMSG_ADDR_ANY 0xFFFFFFFF

@@ -46,6 +47,7 @@ struct rpmsg_channel_info {
* @dst: destination address
* @ept: the rpmsg endpoint of this channel
* @announce: if set, rpmsg will announce the creation/removal of this channel
+ * @little_endian: True if transport is using little endian byte representation
*/
struct rpmsg_device {
struct device dev;
@@ -55,6 +57,7 @@ struct rpmsg_device {
u32 dst;
struct rpmsg_endpoint *ept;
bool announce;
+ bool little_endian;

const struct rpmsg_device_ops *ops;
};
@@ -111,6 +114,54 @@ struct rpmsg_driver {
int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
};

+static inline u16 rpmsg16_to_cpu(struct rpmsg_device *rpdev, __rpmsg16 val)
+{
+ if (!rpdev)
+ return __rpmsg16_to_cpu(rpmsg_is_little_endian(), val);
+ else
+ return __rpmsg16_to_cpu(rpdev->little_endian, val);
+}
+
+static inline __rpmsg16 cpu_to_rpmsg16(struct rpmsg_device *rpdev, u16 val)
+{
+ if (!rpdev)
+ return __cpu_to_rpmsg16(rpmsg_is_little_endian(), val);
+ else
+ return __cpu_to_rpmsg16(rpdev->little_endian, val);
+}
+
+static inline u32 rpmsg32_to_cpu(struct rpmsg_device *rpdev, __rpmsg32 val)
+{
+ if (!rpdev)
+ return __rpmsg32_to_cpu(rpmsg_is_little_endian(), val);
+ else
+ return __rpmsg32_to_cpu(rpdev->little_endian, val);
+}
+
+static inline __rpmsg32 cpu_to_rpmsg32(struct rpmsg_device *rpdev, u32 val)
+{
+ if (!rpdev)
+ return __cpu_to_rpmsg32(rpmsg_is_little_endian(), val);
+ else
+ return __cpu_to_rpmsg32(rpdev->little_endian, val);
+}
+
+static inline u64 rpmsg64_to_cpu(struct rpmsg_device *rpdev, __rpmsg64 val)
+{
+ if (!rpdev)
+ return __rpmsg64_to_cpu(rpmsg_is_little_endian(), val);
+ else
+ return __rpmsg64_to_cpu(rpdev->little_endian, val);
+}
+
+static inline __rpmsg64 cpu_to_rpmsg64(struct rpmsg_device *rpdev, u64 val)
+{
+ if (!rpdev)
+ return __cpu_to_rpmsg64(rpmsg_is_little_endian(), val);
+ else
+ return __cpu_to_rpmsg64(rpdev->little_endian, val);
+}
+
#if IS_ENABLED(CONFIG_RPMSG)

int register_rpmsg_device(struct rpmsg_device *dev);
diff --git a/include/linux/rpmsg/byteorder.h b/include/linux/rpmsg/byteorder.h
new file mode 100644
index 000000000000..c0f565dbad6d
--- /dev/null
+++ b/include/linux/rpmsg/byteorder.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Follows implementation found in linux/virtio_byteorder.h
+ */
+#ifndef _LINUX_RPMSG_BYTEORDER_H
+#define _LINUX_RPMSG_BYTEORDER_H
+#include <linux/types.h>
+#include <uapi/linux/rpmsg_types.h>
+
+static inline bool rpmsg_is_little_endian(void)
+{
+#ifdef __LITTLE_ENDIAN
+ return true;
+#else
+ return false;
+#endif
+}
+
+static inline u16 __rpmsg16_to_cpu(bool little_endian, __rpmsg16 val)
+{
+ if (little_endian)
+ return le16_to_cpu((__force __le16)val);
+ else
+ return be16_to_cpu((__force __be16)val);
+}
+
+static inline __rpmsg16 __cpu_to_rpmsg16(bool little_endian, u16 val)
+{
+ if (little_endian)
+ return (__force __rpmsg16)cpu_to_le16(val);
+ else
+ return (__force __rpmsg16)cpu_to_be16(val);
+}
+
+static inline u32 __rpmsg32_to_cpu(bool little_endian, __rpmsg32 val)
+{
+ if (little_endian)
+ return le32_to_cpu((__force __le32)val);
+ else
+ return be32_to_cpu((__force __be32)val);
+}
+
+static inline __rpmsg32 __cpu_to_rpmsg32(bool little_endian, u32 val)
+{
+ if (little_endian)
+ return (__force __rpmsg32)cpu_to_le32(val);
+ else
+ return (__force __rpmsg32)cpu_to_be32(val);
+}
+
+static inline u64 __rpmsg64_to_cpu(bool little_endian, __rpmsg64 val)
+{
+ if (little_endian)
+ return le64_to_cpu((__force __le64)val);
+ else
+ return be64_to_cpu((__force __be64)val);
+}
+
+static inline __rpmsg64 __cpu_to_rpmsg64(bool little_endian, u64 val)
+{
+ if (little_endian)
+ return (__force __rpmsg64)cpu_to_le64(val);
+ else
+ return (__force __rpmsg64)cpu_to_be64(val);
+}
+
+#endif /* _LINUX_RPMSG_BYTEORDER_H */
diff --git a/include/uapi/linux/rpmsg_types.h b/include/uapi/linux/rpmsg_types.h
new file mode 100644
index 000000000000..36e3b9404391
--- /dev/null
+++ b/include/uapi/linux/rpmsg_types.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_RPMSG_TYPES_H
+#define _UAPI_LINUX_RPMSG_TYPES_H
+
+#include <linux/types.h>
+
+typedef __u16 __bitwise __rpmsg16;
+typedef __u32 __bitwise __rpmsg32;
+typedef __u64 __bitwise __rpmsg64;
+
+#endif /* _UAPI_LINUX_RPMSG_TYPES_H */
--
2.25.1