open-gpu-kernel-modules/kernel-open/nvidia-modeset/nvkms-ioctl.h

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2022-05-09 22:18:59 +02:00
/*
* SPDX-FileCopyrightText: Copyright (c) 2015 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.
*/
#if !defined(NVKMS_IOCTL_H)
#define NVKMS_IOCTL_H
#include "nvtypes.h"
/*!
* Some of the NVKMS ioctl parameter data structures are quite large
* and would exceed the parameter size constraints on at least SunOS.
*
* Redirect ioctls through a level of indirection: user-space assigns
* NvKmsIoctlParams with the real command, size, and pointer, and
* passes the NvKmsIoctlParams through the ioctl.
*/
struct NvKmsIoctlParams {
NvU32 cmd;
NvU32 size;
NvU64 address NV_ALIGN_BYTES(8);
};
#define NVKMS_IOCTL_MAGIC 'm'
#define NVKMS_IOCTL_CMD 0
#define NVKMS_IOCTL_IOWR \
_IOWR(NVKMS_IOCTL_MAGIC, NVKMS_IOCTL_CMD, struct NvKmsIoctlParams)
/*!
* User-space pointers are always passed to NVKMS in an NvU64.
* This user-space address is eventually passed into the platform's
* copyin/copyout functions, in a void* argument.
*
* This utility function converts from an NvU64 to a pointer.
*/
static inline void *nvKmsNvU64ToPointer(NvU64 value)
{
return (void *)(NvUPtr)value;
}
/*!
* Before casting the NvU64 to a void*, check that casting to a pointer
* size within the kernel does not lose any precision in the current
* environment.
*/
static inline NvBool nvKmsNvU64AddressIsSafe(NvU64 address)
{
return address == (NvU64)(NvUPtr)address;
}
#endif /* NVKMS_IOCTL_H */