// SPDX-License-Identifier: GPL-2.0/* * in kernel monitor support: allows rv to control in-kernel monitors. * * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> */#include <getopt.h>#include <stdlib.h>#include <stdio.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <dirent.h> #include <trace.h>#include <utils.h>#include <rv.h> static int config_has_id;static int config_is_container;static int config_my_pid;static int config_trace; static char *config_initial_reactor;static char *config_reactor; /* * __ikm_read_enable - reads monitor's enable status * * __does not log errors. * * Returns the current status, or -1 if the monitor does not exist, * __hence not logging errors. */static int __ikm_read_enable(char *monitor_name){ char path[MAX_PATH]; long long enabled; int retval; snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); retval = tracefs_instance_file_read_number(NULL, path, &enabled); if (retval < 0) return -1; return enabled;} /* * __ikm_find_monitor - find the full name of a possibly nested module * * __does not log errors. * * Returns 1 if we found the monitor, -1 on error and 0 if it does not exist. * The string out_name is populated with the full name, which can be * equal to monitor_name or container/monitor_name if nested */static int __ikm_find_monitor_name(char *monitor_name, char *out_name){ char *available_monitors, *cursor, *line; int len = strlen(monitor_name); int found = 0; available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL); if (!available_monitors) return -1; config_is_container = 0; cursor = available_monitors; while ((line = strsep(&cursor, "\n"))) { char *colon = strchr(line, ':'); if (strcmp(line, monitor_name) && (!colon || strcmp(colon + 1, monitor_name))) continue; strncpy(out_name, line, 2 * MAX_DA_NAME_LEN); out_name[2 * MAX_DA_NAME_LEN - 1] = '\0'; if (colon) { out_name[colon - line] = '/'; } else { /* If there are children, they are on the next line. */ line = strsep(&cursor, "\n"); if (line && !strncmp(line, monitor_name, len) && line[len] == ':') config_is_container = 1; } found = 1; break; } free(available_monitors); return found;} /* * ikm_read_enable - reads monitor's enable status * * Returns the current status, or -1 on error. */static int ikm_read_enable(char *monitor_name){ int enabled; enabled = __ikm_read_enable(monitor_name); if (enabled < 0) { err_msg("ikm: fail read enabled: %d\n", enabled); return -1; } debug_msg("ikm: read enabled: %d\n", enabled); return enabled;} /* * ikm_write_enable - write to the monitor's enable file * * Return the number of bytes written, -1 on error. */static int ikm_write_enable(char *monitor_name, char *enable_disable){ char path[MAX_PATH]; int retval; debug_msg("ikm: writing enabled: %s\n", enable_disable); snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); retval = tracefs_instance_file_write(NULL, path, enable_disable); if (retval < strlen(enable_disable)) { err_msg("ikm: writing enabled: %s\n", enable_disable); return -1; } return retval;} /* * ikm_enable - enable a monitor * * Returns -1 on failure. Success otherwise. */static int ikm_enable(char *monitor_name){ return ikm_write_enable(monitor_name, "1");} /* * ikm_disable - disable a monitor * * Returns -1 on failure. Success otherwise. */static int ikm_disable(char *monitor_name){ return ikm_write_enable(monitor_name, "0");} /* * ikm_read_desc - read monitors' description * * Return a dynamically allocated string with the monitor's * description, NULL otherwise. */static char *ikm_read_desc(char *monitor_name){ char path[MAX_PATH]; char *desc; snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name); desc = tracefs_instance_file_read(NULL, path, NULL); if (!desc) { err_msg("ikm: error reading monitor %s desc\n", monitor_name); return NULL; } *strstr(desc, "\n") = '\0'; return desc;} /* * ikm_fill_monitor_definition - fill monitor's definition * * Returns -1 on error, 1 if the monitor does not belong in the container, 0 otherwise. * container can be NULL */static int ikm_fill_monitor_definition(char *name, struct monitor *ikm, char *container){ int enabled; char *desc, *nested_name; nested_name = strstr(name, ":"); if (nested_name) { /* it belongs in container if it starts with "container:" */ if (container) { int len = strlen(container); if (strncmp(name, container, len) || name[len] != ':') return 1; } *nested_name = '/'; ++nested_name; ikm->nested = 1; } else { if (container) return 1; nested_name = name; ikm->nested = 0; } enabled = ikm_read_enable(name); if (enabled < 0) { err_msg("ikm: monitor %s fail to read enable file, bug?\n", name); return -1; } desc = ikm_read_desc(name); if (!desc) { err_msg("ikm: monitor %s does not have desc file, bug?\n", name); return -1; } strncpy(ikm->name, nested_name, sizeof(ikm->name) - 1); ikm->name[sizeof(ikm->name) - 1] = '\0'; ikm->enabled = enabled; strncpy(ikm->desc, desc, sizeof(ikm->desc) - 1); ikm->desc[sizeof(ikm->desc) - 1] = '\0'; free(desc); return 0;} /* * ikm_write_reactor - switch the reactor to *reactor * * Return the number or characters written, -1 on error. */static int ikm_write_reactor(char *monitor_name, char *reactor){ char path[MAX_PATH]; int retval; snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); retval = tracefs_instance_file_write(NULL, path, reactor); debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval); return retval;} /* * ikm_read_reactor - read the reactors file * * Returns a dynamically allocated string with monitor's * available reactors, or NULL on error. */static char *ikm_read_reactor(char *monitor_name){ char path[MAX_PATH]; char *reactors; snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); reactors = tracefs_instance_file_read(NULL, path, NULL); if (!reactors) { err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name); return NULL; } return reactors;} /* * ikm_get_current_reactor - get the current enabled reactor * * Reads the reactors file and find the currently enabled * [reactor]. * * Returns a dynamically allocated memory with the current * reactor. NULL otherwise. */static char *ikm_get_current_reactor(char *monitor_name){ char *reactors = ikm_read_reactor(monitor_name); char *curr_reactor = NULL; char *start; char *end; if (!reactors) return NULL; start = strstr(reactors, "["); if (!start) goto out_free; start++; end = strstr(start, "]"); if (!end) goto out_free; *end = '\0'; curr_reactor = calloc(strlen(start) + 1, sizeof(char)); if (!curr_reactor) goto out_free; strncpy(curr_reactor, start, strlen(start)); debug_msg("ikm: read current reactor %s\n", curr_reactor); out_free: free(reactors); return curr_reactor;} static int ikm_has_id(char *monitor_name){ char path[MAX_PATH]; char *format; int has_id; snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name); format = tracefs_instance_file_read(NULL, path, NULL); if (!format) { err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name); return -1; } /* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */ has_id = !!strstr(format, "REC->id"); debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no"); free(format); return has_id;} /** * ikm_list_monitors - list all available monitors * * Returns 0 on success, -1 otherwise. */int ikm_list_monitors(char *container){ char *available_monitors; struct monitor ikm = {0}; char *curr, *next; int retval, list_monitor = 0; available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL); if (!available_monitors) { err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n"); return -1; } curr = available_monitors; do { next = strstr(curr, "\n"); *next = '\0'; retval = ikm_fill_monitor_definition(curr, &ikm, container); if (retval < 0) err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr); if (!retval) { int indent = ikm.nested && !container; list_monitor = 1; printf("%s%-*s %s %s\n", indent ? " - " : "", indent ? MAX_DA_NAME_LEN - 3 : MAX_DA_NAME_LEN, ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]"); } curr = ++next; } while (strlen(curr)); if (!list_monitor) { if (container) printf("-- No monitor found in container %s --\n", container); else printf("-- No monitor found --\n"); } free(available_monitors); return 0;} static void ikm_print_header(struct trace_seq *s){ trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE"); if (config_has_id) trace_seq_printf(s, "%8s ", "ID"); trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", "STATE", "EVENT", "NEXT_STATE", "FINAL"); trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | "); if (config_has_id) trace_seq_printf(s, "%8s ", " | "); trace_seq_printf(s, "%24s %-24s %-24s %s\n", " | ", " | ", " | ", "|"); } /* * ikm_event_handler - callback to handle event events * * Called any time a rv:"monitor"_event events is generated. * It parses and prints event. */static intikm_event_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *trace_event, void *context){ /* if needed: struct trace_instance *inst = context; */ char *state, *event, *next_state; unsigned long long final_state; unsigned long long pid; unsigned long long id; int val; bool missing_id; if (config_has_id) missing_id = tep_get_field_val(s, trace_event, "id", record, &id, 1); tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); if (config_has_id && (config_my_pid == id)) return 0; else if (config_my_pid == pid) return 0; tep_print_event(trace_event->tep, s, record, "%16s-%-8d [%.3d] ", TEP_PRINT_COMM, TEP_PRINT_PID, TEP_PRINT_CPU); if (config_is_container) tep_print_event(trace_event->tep, s, record, "%s ", TEP_PRINT_NAME); else trace_seq_printf(s, "event "); if (config_has_id) { if (missing_id) /* placeholder if we are dealing with a mixed-type container*/ trace_seq_printf(s, " "); else trace_seq_printf(s, "%8llu ", id); } state = tep_get_field_raw(s, trace_event, "state", record, &val, 0); event = tep_get_field_raw(s, trace_event, "event", record, &val, 0); next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0); tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1); trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", state, event, next_state, final_state ? "Y" : "N"); trace_seq_do_printf(s); trace_seq_reset(s); return 0;} /* * ikm_error_handler - callback to handle error events * * Called any time a rv:"monitor"_errors events is generated. * It parses and prints event. */static intikm_error_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *trace_event, void *context){ unsigned long long pid, id; int cpu = record->cpu; char *state, *event; int val; bool missing_id; if (config_has_id) missing_id = tep_get_field_val(s, trace_event, "id", record, &id, 1); tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); if (config_has_id && config_my_pid == id) return 0; else if (config_my_pid == pid)Lines 1–500 of 853. Load more
// SPDX-License-Identifier: GPL-2.0 /* * in kernel monitor support: allows rv to control in-kernel monitors. * * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> */ #include <getopt.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <dirent.h> #include <trace.h> #include <utils.h> #include <rv.h> static int config_has_id; static int config_is_container; static int config_my_pid; static int config_trace; static char *config_initial_reactor; static char *config_reactor; /* * __ikm_read_enable - reads monitor's enable status * * __does not log errors. * * Returns the current status, or -1 if the monitor does not exist, * __hence not logging errors. */ static int __ikm_read_enable(char *monitor_name) { char path[MAX_PATH]; long long enabled; int retval; snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); retval = tracefs_instance_file_read_number(NULL, path, &enabled); if (retval < 0) return -1; return enabled; } /* * __ikm_find_monitor - find the full name of a possibly nested module * * __does not log errors. * * Returns 1 if we found the monitor, -1 on error and 0 if it does not exist. * The string out_name is populated with the full name, which can be * equal to monitor_name or container/monitor_name if nested */ static int __ikm_find_monitor_name(char *monitor_name, char *out_name) { char *available_monitors, *cursor, *line; int len = strlen(monitor_name); int found = 0; available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL); if (!available_monitors) return -1; config_is_container = 0; cursor = available_monitors; while ((line = strsep(&cursor, "\n"))) { char *colon = strchr(line, ':'); if (strcmp(line, monitor_name) && (!colon || strcmp(colon + 1, monitor_name))) continue; strncpy(out_name, line, 2 * MAX_DA_NAME_LEN); out_name[2 * MAX_DA_NAME_LEN - 1] = '\0'; if (colon) { out_name[colon - line] = '/'; } else { /* If there are children, they are on the next line. */ line = strsep(&cursor, "\n"); if (line && !strncmp(line, monitor_name, len) && line[len] == ':') config_is_container = 1; } found = 1; break; } free(available_monitors); return found; } /* * ikm_read_enable - reads monitor's enable status * * Returns the current status, or -1 on error. */ static int ikm_read_enable(char *monitor_name) { int enabled; enabled = __ikm_read_enable(monitor_name); if (enabled < 0) { err_msg("ikm: fail read enabled: %d\n", enabled); return -1; } debug_msg("ikm: read enabled: %d\n", enabled); return enabled; } /* * ikm_write_enable - write to the monitor's enable file * * Return the number of bytes written, -1 on error. */ static int ikm_write_enable(char *monitor_name, char *enable_disable) { char path[MAX_PATH]; int retval; debug_msg("ikm: writing enabled: %s\n", enable_disable); snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); retval = tracefs_instance_file_write(NULL, path, enable_disable); if (retval < strlen(enable_disable)) { err_msg("ikm: writing enabled: %s\n", enable_disable); return -1; } return retval; } /* * ikm_enable - enable a monitor * * Returns -1 on failure. Success otherwise. */ static int ikm_enable(char *monitor_name) { return ikm_write_enable(monitor_name, "1"); } /* * ikm_disable - disable a monitor * * Returns -1 on failure. Success otherwise. */ static int ikm_disable(char *monitor_name) { return ikm_write_enable(monitor_name, "0"); } /* * ikm_read_desc - read monitors' description * * Return a dynamically allocated string with the monitor's * description, NULL otherwise. */ static char *ikm_read_desc(char *monitor_name) { char path[MAX_PATH]; char *desc; snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name); desc = tracefs_instance_file_read(NULL, path, NULL); if (!desc) { err_msg("ikm: error reading monitor %s desc\n", monitor_name); return NULL; } *strstr(desc, "\n") = '\0'; return desc; } /* * ikm_fill_monitor_definition - fill monitor's definition * * Returns -1 on error, 1 if the monitor does not belong in the container, 0 otherwise. * container can be NULL */ static int ikm_fill_monitor_definition(char *name, struct monitor *ikm, char *container) { int enabled; char *desc, *nested_name; nested_name = strstr(name, ":"); if (nested_name) { /* it belongs in container if it starts with "container:" */ if (container) { int len = strlen(container); if (strncmp(name, container, len) || name[len] != ':') return 1; } *nested_name = '/'; ++nested_name; ikm->nested = 1; } else { if (container) return 1; nested_name = name; ikm->nested = 0; } enabled = ikm_read_enable(name); if (enabled < 0) { err_msg("ikm: monitor %s fail to read enable file, bug?\n", name); return -1; } desc = ikm_read_desc(name); if (!desc) { err_msg("ikm: monitor %s does not have desc file, bug?\n", name); return -1; } strncpy(ikm->name, nested_name, sizeof(ikm->name) - 1); ikm->name[sizeof(ikm->name) - 1] = '\0'; ikm->enabled = enabled; strncpy(ikm->desc, desc, sizeof(ikm->desc) - 1); ikm->desc[sizeof(ikm->desc) - 1] = '\0'; free(desc); return 0; } /* * ikm_write_reactor - switch the reactor to *reactor * * Return the number or characters written, -1 on error. */ static int ikm_write_reactor(char *monitor_name, char *reactor) { char path[MAX_PATH]; int retval; snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); retval = tracefs_instance_file_write(NULL, path, reactor); debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval); return retval; } /* * ikm_read_reactor - read the reactors file * * Returns a dynamically allocated string with monitor's * available reactors, or NULL on error. */ static char *ikm_read_reactor(char *monitor_name) { char path[MAX_PATH]; char *reactors; snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); reactors = tracefs_instance_file_read(NULL, path, NULL); if (!reactors) { err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name); return NULL; } return reactors; } /* * ikm_get_current_reactor - get the current enabled reactor * * Reads the reactors file and find the currently enabled * [reactor]. * * Returns a dynamically allocated memory with the current * reactor. NULL otherwise. */ static char *ikm_get_current_reactor(char *monitor_name) { char *reactors = ikm_read_reactor(monitor_name); char *curr_reactor = NULL; char *start; char *end; if (!reactors) return NULL; start = strstr(reactors, "["); if (!start) goto out_free; start++; end = strstr(start, "]"); if (!end) goto out_free; *end = '\0'; curr_reactor = calloc(strlen(start) + 1, sizeof(char)); if (!curr_reactor) goto out_free; strncpy(curr_reactor, start, strlen(start)); debug_msg("ikm: read current reactor %s\n", curr_reactor); out_free: free(reactors); return curr_reactor; } static int ikm_has_id(char *monitor_name) { char path[MAX_PATH]; char *format; int has_id; snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name); format = tracefs_instance_file_read(NULL, path, NULL); if (!format) { err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name); return -1; } /* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */ has_id = !!strstr(format, "REC->id"); debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no"); free(format); return has_id; } /** * ikm_list_monitors - list all available monitors * * Returns 0 on success, -1 otherwise. */ int ikm_list_monitors(char *container) { char *available_monitors; struct monitor ikm = {0}; char *curr, *next; int retval, list_monitor = 0; available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL); if (!available_monitors) { err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n"); return -1; } curr = available_monitors; do { next = strstr(curr, "\n"); *next = '\0'; retval = ikm_fill_monitor_definition(curr, &ikm, container); if (retval < 0) err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr); if (!retval) { int indent = ikm.nested && !container; list_monitor = 1; printf("%s%-*s %s %s\n", indent ? " - " : "", indent ? MAX_DA_NAME_LEN - 3 : MAX_DA_NAME_LEN, ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]"); } curr = ++next; } while (strlen(curr)); if (!list_monitor) { if (container) printf("-- No monitor found in container %s --\n", container); else printf("-- No monitor found --\n"); } free(available_monitors); return 0; } static void ikm_print_header(struct trace_seq *s) { trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE"); if (config_has_id) trace_seq_printf(s, "%8s ", "ID"); trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", "STATE", "EVENT", "NEXT_STATE", "FINAL"); trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | "); if (config_has_id) trace_seq_printf(s, "%8s ", " | "); trace_seq_printf(s, "%24s %-24s %-24s %s\n", " | ", " | ", " | ", "|"); } /* * ikm_event_handler - callback to handle event events * * Called any time a rv:"monitor"_event events is generated. * It parses and prints event. */ static int ikm_event_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *trace_event, void *context) { /* if needed: struct trace_instance *inst = context; */ char *state, *event, *next_state; unsigned long long final_state; unsigned long long pid; unsigned long long id; int val; bool missing_id; if (config_has_id) missing_id = tep_get_field_val(s, trace_event, "id", record, &id, 1); tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); if (config_has_id && (config_my_pid == id)) return 0; else if (config_my_pid == pid) return 0; tep_print_event(trace_event->tep, s, record, "%16s-%-8d [%.3d] ", TEP_PRINT_COMM, TEP_PRINT_PID, TEP_PRINT_CPU); if (config_is_container) tep_print_event(trace_event->tep, s, record, "%s ", TEP_PRINT_NAME); else trace_seq_printf(s, "event "); if (config_has_id) { if (missing_id) /* placeholder if we are dealing with a mixed-type container*/ trace_seq_printf(s, " "); else trace_seq_printf(s, "%8llu ", id); } state = tep_get_field_raw(s, trace_event, "state", record, &val, 0); event = tep_get_field_raw(s, trace_event, "event", record, &val, 0); next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0); tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1); trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", state, event, next_state, final_state ? "Y" : "N"); trace_seq_do_printf(s); trace_seq_reset(s); return 0; } /* * ikm_error_handler - callback to handle error events * * Called any time a rv:"monitor"_errors events is generated. * It parses and prints event. */ static int ikm_error_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *trace_event, void *context) { unsigned long long pid, id; int cpu = record->cpu; char *state, *event; int val; bool missing_id; if (config_has_id) missing_id = tep_get_field_val(s, trace_event, "id", record, &id, 1); tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); if (config_has_id && config_my_pid == id) return 0; else if (config_my_pid == pid)