1*de68c051SAndrea Righi /* SPDX-License-Identifier: GPL-2.0 */ 2*de68c051SAndrea Righi /* 3*de68c051SAndrea Righi * Define struct user_exit_info which is shared between BPF and userspace parts 4*de68c051SAndrea Righi * to communicate exit status and other information. 5*de68c051SAndrea Righi * 6*de68c051SAndrea Righi * Copyright (c) 2022 Meta Platforms, Inc. and affiliates. 7*de68c051SAndrea Righi * Copyright (c) 2022 Tejun Heo <tj@kernel.org> 8*de68c051SAndrea Righi * Copyright (c) 2022 David Vernet <dvernet@meta.com> 9*de68c051SAndrea Righi */ 10*de68c051SAndrea Righi 11*de68c051SAndrea Righi #ifndef __USER_EXIT_INFO_BPF_H 12*de68c051SAndrea Righi #define __USER_EXIT_INFO_BPF_H 13*de68c051SAndrea Righi 14*de68c051SAndrea Righi #ifndef LSP 15*de68c051SAndrea Righi #include "vmlinux.h" 16*de68c051SAndrea Righi #endif 17*de68c051SAndrea Righi #include <bpf/bpf_core_read.h> 18*de68c051SAndrea Righi 19*de68c051SAndrea Righi #include "user_exit_info_common.h" 20*de68c051SAndrea Righi 21*de68c051SAndrea Righi #define UEI_DEFINE(__name) \ 22*de68c051SAndrea Righi char RESIZABLE_ARRAY(data, __name##_dump); \ 23*de68c051SAndrea Righi const volatile u32 __name##_dump_len; \ 24*de68c051SAndrea Righi struct user_exit_info __name SEC(".data") 25*de68c051SAndrea Righi 26*de68c051SAndrea Righi #define UEI_RECORD(__uei_name, __ei) ({ \ 27*de68c051SAndrea Righi bpf_probe_read_kernel_str(__uei_name.reason, \ 28*de68c051SAndrea Righi sizeof(__uei_name.reason), (__ei)->reason); \ 29*de68c051SAndrea Righi bpf_probe_read_kernel_str(__uei_name.msg, \ 30*de68c051SAndrea Righi sizeof(__uei_name.msg), (__ei)->msg); \ 31*de68c051SAndrea Righi bpf_probe_read_kernel_str(__uei_name##_dump, \ 32*de68c051SAndrea Righi __uei_name##_dump_len, (__ei)->dump); \ 33*de68c051SAndrea Righi if (bpf_core_field_exists((__ei)->exit_code)) \ 34*de68c051SAndrea Righi __uei_name.exit_code = (__ei)->exit_code; \ 35*de68c051SAndrea Righi /* use __sync to force memory barrier */ \ 36*de68c051SAndrea Righi __sync_val_compare_and_swap(&__uei_name.kind, __uei_name.kind, \ 37*de68c051SAndrea Righi (__ei)->kind); \ 38*de68c051SAndrea Righi }) 39*de68c051SAndrea Righi 40*de68c051SAndrea Righi #endif /* __USER_EXIT_INFO_BPF_H */ 41