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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: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ian Munsie 2014-10-08 19:55:03 +11:00 committed by Michael Ellerman
parent f204e0b8ce
commit 66b43081c0
3 changed files with 90 additions and 0 deletions
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1
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/

2
include/uapi/misc/Kbuild Normal file
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@ -0,0 +1,2 @@
# misc Header export list
header-y += cxl.h

87
include/uapi/misc/cxl.h Normal file
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@ -0,0 +1,87 @@
/*
* 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 */