nvidia-open-gpu-kernel-modules/kernel-open/nvidia/ioctl_common_nvswitch.h

/*
 * SPDX-FileCopyrightText: Copyright (c) 2019-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef _IOCTL_COMMON_NVSWITCH_H_
#define _IOCTL_COMMON_NVSWITCH_H_

#ifdef __cplusplus
extern "C"
{
#endif

#define NVSWITCH_DEV_IO_TYPE 'd'
#define NVSWITCH_CTL_IO_TYPE 'c'

/*
 * Defines for IOCTL Hints
 *
 * NVSWITCH_IO_READ_ONLY :
 *      Only reads parameters from the kernel and does not pass any to it
 *
 * NVSWITCH_IO_WRITE_ONLY :
 *      Only writes parameters to the kernel, but does not want anything back.
 *
 * NVSWITCH_IO_WRITE_READ :
 *      Writes data to the kernel and wants information back
 *
 * NVSWITCH_IO_DEFAULT :
 *      Don't copy anything into the kernel, nor copy anything back.
 */
#define NVSWITCH_IO_READ_ONLY             0x0
#define NVSWITCH_IO_WRITE_ONLY            0x1
#define NVSWITCH_IO_WRITE_READ            0x2
#define NVSWITCH_IO_DEFAULT               0x3

#if (defined(_WIN32) || defined(_WIN64))
/*
 * Values of less than 0x800 are reserved for Microsoft.
 * Values of 0x800 and higher can be used by vendors.
 */
#define IOCTL_START_INDEX             0x800

/*
 * Macro for defining new IOCTLs in a platform independent way.
 */
#define NVSWITCH_IOCTL_CODE(ioType, ctrl, paramType, direction)                \
    CTL_CODE(FILE_DEVICE_UNKNOWN, IOCTL_START_INDEX + ctrl, METHOD_BUFFERED,   \
            (FILE_READ_DATA | FILE_WRITE_DATA))
#else

/*
 * Macro for defining new IOCTLs in a platform independent way.
 *
 * Select Linux specific IOCTL defining macro (_IO, _IOR, _IOW, _IOWR)
 * based on IOCTL direction.
 */
#define NVSWITCH_IOCTL_CODE(ioType, ctrl, paramType, direction)               \
    ((direction == NVSWITCH_IO_READ_ONLY)  ? _IOR(ioType, ctrl, paramType)  : \
     (direction == NVSWITCH_IO_WRITE_ONLY) ? _IOW(ioType, ctrl, paramType)  : \
     (direction == NVSWITCH_IO_WRITE_READ) ? _IOWR(ioType, ctrl, paramType) : \
     _IO(ioType, ctrl))

#endif // (defined(_WIN32) || defined(_WIN64))

/*
 * NVSWITCH_NVLINK_MAX_LANES is used by both internal and exteranl IOCTLs.
 */
#define NVSWITCH_NVLINK_MAX_LANES  4

/*
 * Common Fabric State enums
 *
 * Definitions:
 *    Driver Fabric State is intended to reflect the state of the driver and
 *    fabric manager.  Once FM sets the Driver State to CONFIGURED, it is
 *    expected the FM will send heartbeat updates.  If the heartbeat is not
 *    received before the session timeout, then the driver reports status
 *    as MANAGER_TIMEOUT.
 *
 *    Device Fabric State reflects the state of the nvswitch device.
 *    FM sets the Device Fabric State to CONFIGURED once FM is managing the
 *    device.  If the Device Fabric State is BLACKLISTED then the device is
 *    not available for use; opens fail for a blacklisted device, and interrupts
 *    are disabled.
 *
 *    Blacklist Reason provides additional detail of why a device is blacklisted.
 */
typedef enum nvswitch_driver_fabric_state
{
    NVSWITCH_DRIVER_FABRIC_STATE_OFFLINE = 0,      // offline (No driver loaded)
    NVSWITCH_DRIVER_FABRIC_STATE_STANDBY,          // driver up, no FM
    NVSWITCH_DRIVER_FABRIC_STATE_CONFIGURED,       // driver up, FM up
    NVSWITCH_DRIVER_FABRIC_STATE_MANAGER_TIMEOUT,  // driver up, FM timed out
    NVSWITCH_DRIVER_FABRIC_STATE_MANAGER_ERROR,    // driver up, FM in error state
    NVSWITCH_DRIVER_FABRIC_STATE_COUNT
} NVSWITCH_DRIVER_FABRIC_STATE;

typedef enum nvswitch_device_fabric_state
{
    NVSWITCH_DEVICE_FABRIC_STATE_OFFLINE = 0,      // offline: No driver, no FM
    NVSWITCH_DEVICE_FABRIC_STATE_STANDBY,          // driver up, no FM, not blacklisted
    NVSWITCH_DEVICE_FABRIC_STATE_CONFIGURED,       // driver up, FM up, not blacklisted
    NVSWITCH_DEVICE_FABRIC_STATE_BLACKLISTED,      // device is blacklisted
    NVSWITCH_DEVICE_FABRIC_STATE_COUNT
} NVSWITCH_DEVICE_FABRIC_STATE;

typedef enum nvswitch_device_blacklist_mode
{
    NVSWITCH_DEVICE_BLACKLIST_REASON_NONE = 0,                  // device is not blacklisted
    NVSWITCH_DEVICE_BLACKLIST_REASON_MANUAL_OUT_OF_BAND,        // manually blacklisted by out-of-band client
    NVSWITCH_DEVICE_BLACKLIST_REASON_MANUAL_IN_BAND,            // manually blacklisted by in-band OS config
    NVSWITCH_DEVICE_BLACKLIST_REASON_MANUAL_PEER,               // FM indicates blacklisted due to peer manual blacklisted
    NVSWITCH_DEVICE_BLACKLIST_REASON_TRUNK_LINK_FAILURE,        // FM indicates blacklisted due to trunk link failure
    NVSWITCH_DEVICE_BLACKLIST_REASON_TRUNK_LINK_FAILURE_PEER,   // FM indicates blacklisted due to trunk link failure of peer
    NVSWITCH_DEVICE_BLACKLIST_REASON_ACCESS_LINK_FAILURE,       // FM indicates blacklisted due to access link failure
    NVSWITCH_DEVICE_BLACKLIST_REASON_ACCESS_LINK_FAILURE_PEER,  // FM indicates blacklisted due to access link failure of peer
    NVSWITCH_DEVICE_BLACKLIST_REASON_UNSPEC_DEVICE_FAILURE,     // FM indicates blacklisted due to unspecified device failure
    NVSWITCH_DEVICE_BLACKLIST_REASON_UNSPEC_DEVICE_FAILURE_PEER // FM indicates blacklisted due to unspec device failure of peer
} NVSWITCH_DEVICE_BLACKLIST_REASON;

#ifdef __cplusplus
}
#endif // __cplusplus

#endif //_IOCTL_COMMON_NVSWITCH_H_