PowerPC FW introduced HVPIPE RTAS calls such as
ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg for the user space
to exchange information with different sources such as Hardware
Management Consoles (HMC).
HVPIPE_IOC_CREATE_HANDLE is defined to use /dev/papr-hvpipe
interface for ibm,send-hvpipe-msg and ibm,receive-hvpipe-msg
RTAS calls.
Also defined papr_hvpipe_hdr which will added in the payload
that is passed between the kernel and the user space.
Signed-off-by: Haren Myneni <ha...@linux.ibm.com>
---
.../userspace-api/ioctl/ioctl-number.rst | 2 ++
arch/powerpc/include/uapi/asm/papr-hvpipe.h | 33 +++++++++++++++++++
2 files changed, 35 insertions(+)
create mode 100644 arch/powerpc/include/uapi/asm/papr-hvpipe.h
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst
b/Documentation/userspace-api/ioctl/ioctl-number.rst
index bc91756bde73..8ed8eb54cb7d 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -371,6 +371,8 @@ Code Seq# Include File
Comments
<mailto:linuxppc-dev>
0xB2 08 powerpc/include/uapi/asm/papr-physical-attestation.h
powerpc/pseries Physical Attestation API
<mailto:linuxppc-dev>
+0xB2 09 arch/powerpc/include/uapi/asm/papr-hvpipe.h
powerpc/pseries HVPIPE API
+
<mailto:linuxppc-dev>
0xB3 00 linux/mmc/ioctl.h
0xB4 00-0F linux/gpio.h
<mailto:linux-g...@vger.kernel.org>
0xB5 00-0F uapi/linux/rpmsg.h
<mailto:linux-remotep...@vger.kernel.org>
diff --git a/arch/powerpc/include/uapi/asm/papr-hvpipe.h
b/arch/powerpc/include/uapi/asm/papr-hvpipe.h
new file mode 100644
index 000000000000..459a7bb0e6c9
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/papr-hvpipe.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_PAPR_HVPIPE_H_
+#define _UAPI_PAPR_HVPIPE_H_
+
+#include <linux/types.h>
+#include <asm/ioctl.h>
+#include <asm/papr-miscdev.h>
+
+/*
+ * This header is included in payload between OS and the user
+ * space.
+ * flags: OS notifies the user space whether the hvpipe is
+ * closed or the buffer has the payload.
+ */
+struct papr_hvpipe_hdr {
+ u8 version;
+ u8 reserved[3];
+ u32 flags;
+ u8 reserved2[40];
+};
+
+/*
+ * ioctl for /dev/papr-hvpipe
+ */
+#define PAPR_HVPIPE_IOC_CREATE_HANDLE _IOW(PAPR_MISCDEV_IOC_ID, 9, __u32)
+
+/*
+ * hvpipe_hdr flags used for read()
+ */
+#define HVPIPE_MSG_AVAILABLE 0x01 /* Payload is available */
+#define HVPIPE_LOST_CONNECTION 0x02 /* Pipe connection is closed/unavailable */
+
+#endif /* _UAPI_PAPR_HVPIPE_H_ */
--
2.43.5
