diff options
| author | Ian Munsie <imunsie@au1.ibm.com> | 2014-10-08 19:55:03 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2014-10-08 20:15:57 +1100 |
| commit | 66b43081c0bde3171208a7cb52f5807dce4a79e4 (patch) | |
| tree | 65715b6e6dccf426bf6de100bb58ec3da955fdcf /include/uapi/misc | |
| parent | f204e0b8cedd7da1dfcfd05ed6b7692737e24029 (diff) | |
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>
Diffstat (limited to 'include/uapi/misc')
| -rw-r--r-- | include/uapi/misc/Kbuild | 2 | ||||
| -rw-r--r-- | include/uapi/misc/cxl.h | 87 |
2 files changed, 89 insertions, 0 deletions
diff --git a/include/uapi/misc/Kbuild b/include/uapi/misc/Kbuild new file mode 100644 index 000000000000..e96cae7d58c9 --- /dev/null +++ b/include/uapi/misc/Kbuild @@ -0,0 +1,2 @@ +# misc Header export list +header-y += cxl.h diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h new file mode 100644 index 000000000000..c232be6ae21f --- /dev/null +++ b/include/uapi/misc/cxl.h @@ -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 */ |