From: Haren Myneni Date: Tue, 9 Sep 2025 08:43:53 +0000 (-0700) Subject: powerpc/pseries: Define papr-hvpipe ioctl X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=043439ad1a23cd3f65628310d1f5a06e61f8b431;p=users%2Fhch%2Fmisc.git 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: Haren Myneni Tested-by: Shashank MS Reviewed-by: Mahesh Salgaonkar Reviewed-by: Tyrel Datwyler Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250909084402.1488456-2-haren@linux.ibm.com --- diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 406a9f4d0869..7c527a01d1cf 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -374,6 +374,8 @@ Code Seq# Include File Comments 0xB2 08 arch/powerpc/include/uapi/asm/papr-physical-attestation.h powerpc/pseries Physical Attestation API +0xB2 09 arch/powerpc/include/uapi/asm/papr-hvpipe.h powerpc/pseries HVPIPE API + 0xB3 00 linux/mmc/ioctl.h 0xB4 00-0F linux/gpio.h 0xB5 00-0F uapi/linux/rpmsg.h 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 +#include +#include + +/* + * 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_ */