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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/sched_ext/include/scx/user_exit_info.bpf.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Define struct user_exit_info which is shared between BPF and userspace parts

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 * to communicate exit status and other information.

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 *

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 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates.

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 * Copyright (c) 2022 Tejun Heo <[email protected]>

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 * Copyright (c) 2022 David Vernet <[email protected]>

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 */

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#ifndef __USER_EXIT_INFO_BPF_H

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#define __USER_EXIT_INFO_BPF_H

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#ifndef LSP

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#include "vmlinux.h"

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#endif

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#include <bpf/bpf_core_read.h>

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#include "user_exit_info_common.h"

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#define UEI_DEFINE(__name)							\

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	char RESIZABLE_ARRAY(data, __name##_dump);				\

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	const volatile u32 __name##_dump_len;					\

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	struct user_exit_info __name SEC(".data")

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#define UEI_RECORD(__uei_name, __ei) ({						\

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	bpf_probe_read_kernel_str(__uei_name.reason,				\

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				  sizeof(__uei_name.reason), (__ei)->reason);	\

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	bpf_probe_read_kernel_str(__uei_name.msg,				\

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				  sizeof(__uei_name.msg), (__ei)->msg);		\

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	bpf_probe_read_kernel_str(__uei_name##_dump,				\

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				  __uei_name##_dump_len, (__ei)->dump);		\

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	if (bpf_core_field_exists((__ei)->exit_code))				\

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		__uei_name.exit_code = (__ei)->exit_code;			\

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	/* use __sync to force memory barrier */				\

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	__sync_val_compare_and_swap(&__uei_name.kind, __uei_name.kind,		\

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				    (__ei)->kind);				\

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})

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#endif /* __USER_EXIT_INFO_BPF_H */

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