root/include/uapi/misc/cxl.h

/*
 * 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>


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)

#define CXL_READ_MIN_SIZE 0x1000 /* 4K */

/* Events from read() */
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 */