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| 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 |
Warning: That file was not part of the compilation database. It may have many parsing errors.