Commit 043439ad authored by Haren Myneni's avatar Haren Myneni Committed by Madhavan Srinivasan
Browse files

powerpc/pseries: Define papr-hvpipe ioctl 



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: default avatarHaren Myneni <haren@linux.ibm.com>
Tested-by: default avatarShashank MS <shashank.gowda@in.ibm.com>
Reviewed-by: default avatarMahesh Salgaonkar <mahesh@linux.ibm.com>
Reviewed-by: default avatarTyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250909084402.1488456-2-haren@linux.ibm.com
parent daaa574a

Documentation/userspace-api/ioctl/ioctl-number.rst

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@@ -374,6 +374,8 @@ Code Seq# Include File Comments 
                                                                       <mailto:linuxppc-dev@lists.ozlabs.org>

0xB2  08     arch/powerpc/include/uapi/asm/papr-physical-attestation.h powerpc/pseries Physical Attestation API

                                                                       <mailto:linuxppc-dev@lists.ozlabs.org>

0xB2  09     arch/powerpc/include/uapi/asm/papr-hvpipe.h               powerpc/pseries HVPIPE API

                                                                       <mailto:linuxppc-dev@lists.ozlabs.org>

0xB3  00     linux/mmc/ioctl.h

0xB4  00-0F  linux/gpio.h                                              <mailto:linux-gpio@vger.kernel.org>

0xB5  00-0F  uapi/linux/rpmsg.h                                        <mailto:linux-remoteproc@vger.kernel.org>

arch/powerpc/include/uapi/asm/papr-hvpipe.h

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/* 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_ */