1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Define struct user_exit_info which is shared between BPF and userspace parts 4 * to communicate exit status and other information. 5 * 6 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates. 7 * Copyright (c) 2022 Tejun Heo <tj@kernel.org> 8 * Copyright (c) 2022 David Vernet <dvernet@meta.com> 9 */ 10 #ifndef __USER_EXIT_INFO_H 11 #define __USER_EXIT_INFO_H 12 13 #include <stdio.h> 14 #include <stdbool.h> 15 16 #include "user_exit_info_common.h" 17 18 /* no need to call the following explicitly if SCX_OPS_LOAD() is used */ 19 #define UEI_SET_SIZE(__skel, __ops_name, __uei_name) ({ \ 20 u32 __len = (__skel)->struct_ops.__ops_name->exit_dump_len ?: UEI_DUMP_DFL_LEN; \ 21 (__skel)->rodata->__uei_name##_dump_len = __len; \ 22 RESIZE_ARRAY((__skel), data, __uei_name##_dump, __len); \ 23 }) 24 25 #define UEI_EXITED(__skel, __uei_name) ({ \ 26 /* use __sync to force memory barrier */ \ 27 __sync_val_compare_and_swap(&(__skel)->data->__uei_name.kind, -1, -1); \ 28 }) 29 30 #define UEI_REPORT(__skel, __uei_name) ({ \ 31 struct user_exit_info *__uei = &(__skel)->data->__uei_name; \ 32 char *__uei_dump = (__skel)->data_##__uei_name##_dump->__uei_name##_dump; \ 33 if (__uei_dump[0] != '\0') { \ 34 fputs("\nDEBUG DUMP\n", stderr); \ 35 fputs("================================================================================\n\n", stderr); \ 36 fputs(__uei_dump, stderr); \ 37 fputs("\n================================================================================\n\n", stderr); \ 38 } \ 39 fprintf(stderr, "EXIT: %s", __uei->reason); \ 40 if (__uei->msg[0] != '\0') \ 41 fprintf(stderr, " (%s)", __uei->msg); \ 42 fputs("\n", stderr); \ 43 __uei->exit_code; \ 44 }) 45 46 /* 47 * We can't import vmlinux.h while compiling user C code. Let's duplicate 48 * scx_exit_code definition. 49 */ 50 enum scx_exit_code { 51 /* Reasons */ 52 SCX_ECODE_RSN_HOTPLUG = 1LLU << 32, 53 54 /* Actions */ 55 SCX_ECODE_ACT_RESTART = 1LLU << 48, 56 }; 57 58 enum uei_ecode_mask { 59 UEI_ECODE_USER_MASK = ((1LLU << 32) - 1), 60 UEI_ECODE_SYS_RSN_MASK = ((1LLU << 16) - 1) << 32, 61 UEI_ECODE_SYS_ACT_MASK = ((1LLU << 16) - 1) << 48, 62 }; 63 64 /* 65 * These macro interpret the ecode returned from UEI_REPORT(). 66 */ 67 #define UEI_ECODE_USER(__ecode) ((__ecode) & UEI_ECODE_USER_MASK) 68 #define UEI_ECODE_SYS_RSN(__ecode) ((__ecode) & UEI_ECODE_SYS_RSN_MASK) 69 #define UEI_ECODE_SYS_ACT(__ecode) ((__ecode) & UEI_ECODE_SYS_ACT_MASK) 70 71 #define UEI_ECODE_RESTART(__ecode) (UEI_ECODE_SYS_ACT((__ecode)) == SCX_ECODE_ACT_RESTART) 72 73 #endif /* __USER_EXIT_INFO_H */ 74