27d4dc7116
Given a file descriptor on an afu device, libcxl currently uses the major/minor number obtained from fstat on the fd to construct path to the afu's sysfs directory. However it is possible that rather than using one of the device in /dev/cxl, a kernel driver creates its own device which export generic cxl interface to the userspace. This causes problems with libcxl as it tries to use a wrong major/minor number to construct the sysfs path and fail. So this patch introduces a new ioctl called CXL_IOCTL_GET_AFU_ID on the afu file descriptor to fetch the cxl_afu_id struct that holds the card/offset-id and mode information. These info is then used by libcxl to construct the correct path to the afu sysfs directory. Testing: - Build against pseries be/le configs - Testing with corresponding libcxl changes to verify that it constructs right sysfs path to the afu. Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_MISC_CXL_H
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#define _UAPI_MISC_CXL_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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struct cxl_ioctl_start_work {
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__u64 flags;
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__u64 work_element_descriptor;
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__u64 amr;
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__s16 num_interrupts;
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__s16 reserved1;
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__s32 reserved2;
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__u64 reserved3;
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__u64 reserved4;
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__u64 reserved5;
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__u64 reserved6;
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};
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#define CXL_START_WORK_AMR 0x0000000000000001ULL
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#define CXL_START_WORK_NUM_IRQS 0x0000000000000002ULL
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#define CXL_START_WORK_ALL (CXL_START_WORK_AMR |\
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CXL_START_WORK_NUM_IRQS)
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/* Possible modes that an afu can be in */
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#define CXL_MODE_DEDICATED 0x1
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#define CXL_MODE_DIRECTED 0x2
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/* possible flags for the cxl_afu_id flags field */
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#define CXL_AFUID_FLAG_SLAVE 0x1 /* In directed-mode afu is in slave mode */
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struct cxl_afu_id {
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__u64 flags; /* One of CXL_AFUID_FLAG_X */
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__u32 card_id;
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__u32 afu_offset;
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__u32 afu_mode; /* one of the CXL_MODE_X */
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__u32 reserved1;
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__u64 reserved2;
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__u64 reserved3;
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__u64 reserved4;
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__u64 reserved5;
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__u64 reserved6;
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};
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/* ioctl numbers */
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#define CXL_MAGIC 0xCA
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#define CXL_IOCTL_START_WORK _IOW(CXL_MAGIC, 0x00, struct cxl_ioctl_start_work)
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#define CXL_IOCTL_GET_PROCESS_ELEMENT _IOR(CXL_MAGIC, 0x01, __u32)
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#define CXL_IOCTL_GET_AFU_ID _IOR(CXL_MAGIC, 0x02, struct cxl_afu_id)
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#define CXL_READ_MIN_SIZE 0x1000 /* 4K */
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/* Events from read() */
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enum cxl_event_type {
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CXL_EVENT_RESERVED = 0,
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CXL_EVENT_AFU_INTERRUPT = 1,
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CXL_EVENT_DATA_STORAGE = 2,
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CXL_EVENT_AFU_ERROR = 3,
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};
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struct cxl_event_header {
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__u16 type;
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__u16 size;
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__u16 process_element;
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__u16 reserved1;
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};
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struct cxl_event_afu_interrupt {
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__u16 flags;
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__u16 irq; /* Raised AFU interrupt number */
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__u32 reserved1;
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};
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struct cxl_event_data_storage {
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__u16 flags;
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__u16 reserved1;
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__u32 reserved2;
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__u64 addr;
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__u64 dsisr;
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__u64 reserved3;
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};
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struct cxl_event_afu_error {
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__u16 flags;
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__u16 reserved1;
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__u32 reserved2;
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__u64 error;
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};
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struct cxl_event {
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struct cxl_event_header header;
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union {
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struct cxl_event_afu_interrupt irq;
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struct cxl_event_data_storage fault;
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struct cxl_event_afu_error afu_error;
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};
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};
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#endif /* _UAPI_MISC_CXL_H */
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