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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/sched_ext/include/scx/user_exit_info.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_H

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#define __USER_EXIT_INFO_H

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#include <stdio.h>

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#include <stdbool.h>

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#include "user_exit_info_common.h"

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/* no need to call the following explicitly if SCX_OPS_LOAD() is used */

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#define UEI_SET_SIZE(__skel, __ops_name, __uei_name) ({					\

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	u32 __len = (__skel)->struct_ops.__ops_name->exit_dump_len ?: UEI_DUMP_DFL_LEN;	\

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	(__skel)->rodata->__uei_name##_dump_len = __len;				\

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	RESIZE_ARRAY((__skel), data, __uei_name##_dump, __len);				\

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})

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#define UEI_EXITED(__skel, __uei_name) ({					\

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	/* use __sync to force memory barrier */				\

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	__sync_val_compare_and_swap(&(__skel)->data->__uei_name.kind, -1, -1);	\

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})

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#define UEI_REPORT(__skel, __uei_name) ({					\

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	struct user_exit_info *__uei = &(__skel)->data->__uei_name;		\

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	char *__uei_dump = (__skel)->data_##__uei_name##_dump->__uei_name##_dump; \

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	if (__uei_dump[0] != '\0') {						\

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		fputs("\nDEBUG DUMP\n", stderr);				\

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		fputs("================================================================================\n\n", stderr); \

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		fputs(__uei_dump, stderr);					\

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		fputs("\n================================================================================\n\n", stderr); \

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	}									\

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	fprintf(stderr, "EXIT: %s", __uei->reason);				\

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	if (__uei->msg[0] != '\0')						\

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		fprintf(stderr, " (%s)", __uei->msg);				\

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	fputs("\n", stderr);							\

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	__uei->exit_code;							\

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})

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/*

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 * We can't import vmlinux.h while compiling user C code. Let's duplicate

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 * scx_exit_code definition.

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 */

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enum scx_exit_code {

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	/* Reasons */

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	SCX_ECODE_RSN_HOTPLUG		= 1LLU << 32,

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	/* Actions */

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	SCX_ECODE_ACT_RESTART		= 1LLU << 48,

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};

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enum uei_ecode_mask {

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	UEI_ECODE_USER_MASK		= ((1LLU << 32) - 1),

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	UEI_ECODE_SYS_RSN_MASK		= ((1LLU << 16) - 1) << 32,

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	UEI_ECODE_SYS_ACT_MASK		= ((1LLU << 16) - 1) << 48,

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};

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/*

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 * These macro interpret the ecode returned from UEI_REPORT().

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 */

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#define UEI_ECODE_USER(__ecode)		((__ecode) & UEI_ECODE_USER_MASK)

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#define UEI_ECODE_SYS_RSN(__ecode)	((__ecode) & UEI_ECODE_SYS_RSN_MASK)

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#define UEI_ECODE_SYS_ACT(__ecode)	((__ecode) & UEI_ECODE_SYS_ACT_MASK)

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#define UEI_ECODE_RESTART(__ecode)	(UEI_ECODE_SYS_ACT((__ecode)) == SCX_ECODE_ACT_RESTART)

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#endif	/* __USER_EXIT_INFO_H */

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