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Commit 66b43081 authored by Ian Munsie's avatar Ian Munsie Committed by Michael Ellerman
Browse files

cxl: Add userspace header file 



This adds a header file for use by userspace programs wanting to interact with
the kernel cxl driver.  It defines structs and magic numbers required for
userspace to interact with devices in /dev/cxl/afuM.N.

Further documentation on this interface is added in a subsequent patch in
Documentation/powerpc/cxl.txt.

It also adds this new userspace header file to Kbuild so it's exported when
doing "make headers_installs".

Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f204e0b8

include/uapi/Kbuild

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@@ -12,3 +12,4 @@ header-y += video/ 
header-y += drm/

header-y += xen/

header-y += scsi/

header-y += misc/

include/uapi/misc/Kbuild

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+2 −0
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# misc Header export list

header-y += cxl.h

include/uapi/misc/cxl.h

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+87 −0
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/*

 * Copyright 2014 IBM Corp.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */



#ifndef _UAPI_MISC_CXL_H

#define _UAPI_MISC_CXL_H



#include <linux/types.h>

#include <linux/ioctl.h>



/* Structs for IOCTLS for userspace to talk to the kernel */

struct cxl_ioctl_start_work {

	__u64 flags;

	__u64 work_element_descriptor;

	__u64 amr;

	__s16 num_interrupts;

	__s16 reserved1;

	__s32 reserved2;

	__u64 reserved3;

	__u64 reserved4;

	__u64 reserved5;

	__u64 reserved6;

};

#define CXL_START_WORK_AMR		0x0000000000000001ULL

#define CXL_START_WORK_NUM_IRQS		0x0000000000000002ULL

#define CXL_START_WORK_ALL		(CXL_START_WORK_AMR |\

					 CXL_START_WORK_NUM_IRQS)



/* IOCTL numbers */

#define CXL_MAGIC 0xCA

#define CXL_IOCTL_START_WORK		_IOW(CXL_MAGIC, 0x00, struct cxl_ioctl_start_work)

#define CXL_IOCTL_GET_PROCESS_ELEMENT	_IOR(CXL_MAGIC, 0x01, __u32)



/* Events from read() */

#define CXL_READ_MIN_SIZE 0x1000 /* 4K */



enum cxl_event_type {

	CXL_EVENT_RESERVED      = 0,

	CXL_EVENT_AFU_INTERRUPT = 1,

	CXL_EVENT_DATA_STORAGE  = 2,

	CXL_EVENT_AFU_ERROR     = 3,

};



struct cxl_event_header {

	__u16 type;

	__u16 size;

	__u16 process_element;

	__u16 reserved1;

};



struct cxl_event_afu_interrupt {

	__u16 flags;

	__u16 irq; /* Raised AFU interrupt number */

	__u32 reserved1;

};



struct cxl_event_data_storage {

	__u16 flags;

	__u16 reserved1;

	__u32 reserved2;

	__u64 addr;

	__u64 dsisr;

	__u64 reserved3;

};



struct cxl_event_afu_error {

	__u16 flags;

	__u16 reserved1;

	__u32 reserved2;

	__u64 error;

};



struct cxl_event {

	struct cxl_event_header header;

	union {

		struct cxl_event_afu_interrupt irq;

		struct cxl_event_data_storage fault;

		struct cxl_event_afu_error afu_error;

	};

};



#endif /* _UAPI_MISC_CXL_H */