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Adding userspace support for the MC (Management Complex) means exporting an ioctl capable device file representing the root resource container. This new functionality in the fsl-mc bus driver intends to provide userspace applications an interface to interact with the MC firmware. Commands that are composed in userspace are sent to the MC firmware through the FSL_MC_SEND_MC_COMMAND ioctl. By default the implicit MC I/O portal is used for this operation, but if the implicit one is busy, a dynamic portal is allocated and then freed upon execution. The command received through the ioctl interface is checked against a known whitelist of accepted MC commands. Commands that attempt a change in hardware configuration will need CAP_NET_ADMIN, while commands used in debugging do not need it. Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> Link: https://lore.kernel.org/r/20210114170752.2927915-4-ciorneiioana@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
34 lines
749 B
C
34 lines
749 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Management Complex (MC) userspace public interface
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*
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* Copyright 2021 NXP
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*
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*/
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#ifndef _UAPI_FSL_MC_H_
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#define _UAPI_FSL_MC_H_
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#include <linux/types.h>
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#define MC_CMD_NUM_OF_PARAMS 7
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/**
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* struct fsl_mc_command - Management Complex (MC) command structure
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* @header: MC command header
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* @params: MC command parameters
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*
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* Used by FSL_MC_SEND_MC_COMMAND
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*/
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struct fsl_mc_command {
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__le64 header;
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__le64 params[MC_CMD_NUM_OF_PARAMS];
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};
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#define FSL_MC_SEND_CMD_IOCTL_TYPE 'R'
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#define FSL_MC_SEND_CMD_IOCTL_SEQ 0xE0
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#define FSL_MC_SEND_MC_COMMAND \
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_IOWR(FSL_MC_SEND_CMD_IOCTL_TYPE, FSL_MC_SEND_CMD_IOCTL_SEQ, \
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struct fsl_mc_command)
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#endif /* _UAPI_FSL_MC_H_ */
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