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67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/*******************************************************************************
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Copyright (c) 2022 NVidia Corporation
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*******************************************************************************/
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#ifndef NVLINK_INBAND_DRV_HDR_H
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#define NVLINK_INBAND_DRV_HDR_H
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/*
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* This header file defines the header that should be used by RM and NVSwitch
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* driver to sync minions on both the sides before an actual inband message
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* transfer is initiated.
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*
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* Modifying the existing header structure is not allowed. A versioning
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* policy must be enforced if such changes are needed in the future.
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*
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* - Avoid use of enums or bit fields. Always use fixed types.
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* - Avoid conditional fields in the structs
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* - Avoid nested and complex structs. Keep them simple and flat for ease of
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* encoding and decoding.
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* - Avoid embedded pointers. Flexible arrays at the end of the struct are allowed.
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* - Always use the packed struct to typecast inband messages. More details:
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* - Always have reserved flags or fields to CYA given the stable ABI conditions.
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*/
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/* Align to byte boundaries */
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#pragma pack(push, 1)
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#include "nvtypes.h"
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#define NVLINK_INBAND_MAX_XFER_SIZE 0x100
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#define NVLINK_INBAND_MAX_XFER_AT_ONCE 4
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#define NVLINK_INBAND_DRV_HDR_TYPE_START NVBIT(0)
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#define NVLINK_INBAND_DRV_HDR_TYPE_MID NVBIT(1)
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#define NVLINK_INBAND_DRV_HDR_TYPE_END NVBIT(2)
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/* Rest of the bits are reserved for future use and must be always set zero. */
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typedef struct
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{
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NvU8 data;
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} nvlink_inband_drv_hdr_t;
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#pragma pack(pop)
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/* Don't add any code after this line */
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#endif
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