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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Define struct user_exit_info which is shared between BPF and userspace parts
* to communicate exit status and other information.
*
* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2022 Tejun Heo <tj@kernel.org>
* Copyright (c) 2022 David Vernet <dvernet@meta.com>
*/
#ifndef __USER_EXIT_INFO_H
#define __USER_EXIT_INFO_H
#include <stdio.h>
#include <stdbool.h>
#include "user_exit_info_common.h"
/* no need to call the following explicitly if SCX_OPS_LOAD() is used */
#define UEI_SET_SIZE(__skel, __ops_name, __uei_name) ({ \
u32 __len = (__skel)->struct_ops.__ops_name->exit_dump_len ?: UEI_DUMP_DFL_LEN; \
(__skel)->rodata->__uei_name##_dump_len = __len; \
RESIZE_ARRAY((__skel), data, __uei_name##_dump, __len); \
})
#define UEI_EXITED(__skel, __uei_name) ({ \
/* use __sync to force memory barrier */ \
__sync_val_compare_and_swap(&(__skel)->data->__uei_name.kind, -1, -1); \
})
#define UEI_REPORT(__skel, __uei_name) ({ \
struct user_exit_info *__uei = &(__skel)->data->__uei_name; \
char *__uei_dump = (__skel)->data_##__uei_name##_dump->__uei_name##_dump; \
if (__uei_dump[0] != '\0') { \
fputs("\nDEBUG DUMP\n", stderr); \
fputs("================================================================================\n\n", stderr); \
fputs(__uei_dump, stderr); \
fputs("\n================================================================================\n\n", stderr); \
} \
fprintf(stderr, "EXIT: %s", __uei->reason); \
if (__uei->msg[0] != '\0') \
fprintf(stderr, " (%s)", __uei->msg); \
fputs("\n", stderr); \
__uei->exit_code; \
})
/*
* We can't import vmlinux.h while compiling user C code. Let's duplicate
* scx_exit_code definition.
*/
enum scx_exit_code {
/* Reasons */
SCX_ECODE_RSN_HOTPLUG = 1LLU << 32,
/* Actions */
SCX_ECODE_ACT_RESTART = 1LLU << 48,
};
enum uei_ecode_mask {
UEI_ECODE_USER_MASK = ((1LLU << 32) - 1),
UEI_ECODE_SYS_RSN_MASK = ((1LLU << 16) - 1) << 32,
UEI_ECODE_SYS_ACT_MASK = ((1LLU << 16) - 1) << 48,
};
/*
* These macro interpret the ecode returned from UEI_REPORT().
*/
#define UEI_ECODE_USER(__ecode) ((__ecode) & UEI_ECODE_USER_MASK)
#define UEI_ECODE_SYS_RSN(__ecode) ((__ecode) & UEI_ECODE_SYS_RSN_MASK)
#define UEI_ECODE_SYS_ACT(__ecode) ((__ecode) & UEI_ECODE_SYS_ACT_MASK)
#define UEI_ECODE_RESTART(__ecode) (UEI_ECODE_SYS_ACT((__ecode)) == SCX_ECODE_ACT_RESTART)
#endif /* __USER_EXIT_INFO_H */
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