Subject: [PATCH] crash-trace-command: generate trace.dat from core-file This patch adds a command "trace dump -t" for crash-trace-command which is extension of crash(8) for analyzing and dumping ftrace from core-file.
This extension already has "trace show" to show what events had happened before crash, but it is just 1000 lines of code and it is not so smart as "trace-cmd report". New command "trace dump -t" generates a trace.dat, and then, we can use "trace-cmd report" for this trace.dat. trace-cmd(1) is a ftrace tool written by Steven Rostedt <[email protected]>. It includes two tools for showing ftrace events "trace-cmd report" and "kernelshark". SEE ALSO: trace-cmd(1), trace-cmd-report(1), trace-cmd.dat(5) Note, this patch does not just improve crash-trace-command, it improves trace-cmd also. It makes trace-cmd can handle ftrace even the kernel crashed. Usage: 1) start crash(8) for a core-file, and execute the following command in crash(8): 2) extend <your-path-to-crash-trace-command, example: /usr/lib/crash/trace.so> 3) trace dump -t 4) q<enter> to quit crash 5) trace-cmd report or kernelshark Signed-off-by: Lai Jiangshan <[email protected]> --- trace.c | 778 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 693 insertions(+), 85 deletions(-) diff --git a/extensions/trace.c b/extensions/trace.c index 89eb477..d100869 100755 --- a/extensions/trace.c +++ b/extensions/trace.c @@ -1,7 +1,7 @@ /* * trace extension module for crash * - * Copyright (C) 2009 FUJITSU LIMITED + * Copyright (C) 2009, 2010 FUJITSU LIMITED * Author: Lai Jiangshan <[email protected]> * * This program is free software; you can redistribute it and/or modify @@ -53,6 +53,7 @@ static int koffset(list_head, next); static int koffset(ftrace_event_call, list); static int koffset(ftrace_event_call, name); static int koffset(ftrace_event_call, system); +static int koffset(ftrace_event_call, print_fmt); static int koffset(ftrace_event_call, id); static int koffset(ftrace_event_call, fields); @@ -74,8 +75,11 @@ struct ring_buffer_per_cpu { ulong reader_page; ulong real_head_page; - ulong *pages; int head_page_index; + ulong *pages; + + ulong *linear_pages; + int nr_linear_pages; ulong overrun; ulong entries; @@ -112,6 +116,22 @@ static void ftrace_show_destroy(void); /* Remove the "const" qualifiers for ptr */ #define free(ptr) free((void *)(ptr)) +static int write_and_check(int fd, void *data, size_t size) +{ + size_t tot = 0; + size_t w; + + do { + w = write(fd, data, size - tot); + tot += w; + + if (w <= 0) + return -1; + } while (tot != size); + + return 0; +} + #ifndef PATH_MAX #define PATH_MAX 4096 #endif @@ -153,6 +173,7 @@ static void init_offsets(void) init_offset(ftrace_event_call, list); init_offset(ftrace_event_call, name); init_offset(ftrace_event_call, system); + init_offset(ftrace_event_call, print_fmt); init_offset(ftrace_event_call, id); init_offset(ftrace_event_call, fields); @@ -199,6 +220,7 @@ static void print_offsets(void) print_offset(ftrace_event_call, list); print_offset(ftrace_event_call, name); print_offset(ftrace_event_call, system); + print_offset(ftrace_event_call, print_fmt); print_offset(ftrace_event_call, id); print_offset(ftrace_event_call, fields); @@ -214,7 +236,7 @@ static void print_offsets(void) static int ftrace_init_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages) { - unsigned j = 0; + unsigned j = 0, count = 0; ulong head, page; ulong real_head_page = cpu_buffer->head_page; @@ -222,6 +244,12 @@ static int ftrace_init_pages(struct ring_buffer_per_cpu *cpu_buffer, if (cpu_buffer->pages == NULL) return -1; + cpu_buffer->linear_pages = calloc(sizeof(ulong), nr_pages + 1); + if (cpu_buffer->linear_pages == NULL) { + free(cpu_buffer->pages); + return -1; + } + if (lockless_ring_buffer) { read_value(head, cpu_buffer->kaddr, ring_buffer_per_cpu, pages); cpu_buffer->pages[j++] = head - koffset(buffer_page, list); @@ -253,6 +281,8 @@ static int ftrace_init_pages(struct ring_buffer_per_cpu *cpu_buffer, goto out_fail; } + /* find head page and head_page_index */ + cpu_buffer->real_head_page = real_head_page; cpu_buffer->head_page_index = -1; @@ -268,10 +298,38 @@ static int ftrace_init_pages(struct ring_buffer_per_cpu *cpu_buffer, goto out_fail; } + /* Setup linear pages */ + + cpu_buffer->linear_pages[count++] = cpu_buffer->reader_page; + + if (cpu_buffer->reader_page == cpu_buffer->commit_page) + goto done; + + j = cpu_buffer->head_page_index; + for (;;) { + cpu_buffer->linear_pages[count++] = cpu_buffer->pages[j]; + + if (cpu_buffer->pages[j] == cpu_buffer->commit_page) + break; + + j++; + if (j == nr_pages) + j = 0; + + if (j == cpu_buffer->head_page_index) { + /* cpu_buffer->commit_page may be corrupted */ + break; + } + } + +done: + cpu_buffer->nr_linear_pages = count; + return 0; out_fail: free(cpu_buffer->pages); + free(cpu_buffer->linear_pages); return -1; } @@ -284,6 +342,7 @@ static void ftrace_destroy_buffers(struct ring_buffer_per_cpu *buffers) continue; free(buffers[i].pages); + free(buffers[i].linear_pages); } } @@ -470,7 +529,7 @@ static void ftrace_destroy(void) free(global_buffers); } -static int ftrace_dump_page(FILE *out, ulong page, void *page_tmp) +static int ftrace_dump_page(int fd, ulong page, void *page_tmp) { ulong raw_page; @@ -480,7 +539,8 @@ static int ftrace_dump_page(FILE *out, ulong page, void *page_tmp) RETURN_ON_ERROR)) goto out_fail; - fwrite(page_tmp, 1, PAGESIZE(), out); + if (write_and_check(fd, page_tmp, PAGESIZE())) + return -1; return 0; @@ -489,33 +549,15 @@ out_fail: } static -void ftrace_dump_buffer(FILE *out, struct ring_buffer_per_cpu *cpu_buffer, +void ftrace_dump_buffer(int fd, struct ring_buffer_per_cpu *cpu_buffer, unsigned pages, void *page_tmp) { - unsigned i; - - if (ftrace_dump_page(out, cpu_buffer->reader_page, page_tmp) < 0) - return; - - if (cpu_buffer->reader_page == cpu_buffer->commit_page) - return; - - i = cpu_buffer->head_page_index; - for (;;) { - if (ftrace_dump_page(out, cpu_buffer->pages[i], page_tmp) < 0) - break; - - if (cpu_buffer->pages[i] == cpu_buffer->commit_page) - break; - - i++; - if (i == pages) - i = 0; + int i; - if (i == cpu_buffer->head_page_index) { - /* cpu_buffer->commit_page may be corrupted */ + for (i = 0; i < cpu_buffer->nr_linear_pages; i++) { + if (ftrace_dump_page(fd, cpu_buffer->linear_pages[i], + page_tmp) < 0) break; - } } } @@ -540,7 +582,7 @@ static int ftrace_dump_buffers(const char *per_cpu_path) int i; void *page_tmp; char path[PATH_MAX]; - FILE *out; + int fd; page_tmp = malloc(PAGESIZE()); if (page_tmp == NULL) @@ -558,12 +600,12 @@ static int ftrace_dump_buffers(const char *per_cpu_path) snprintf(path, sizeof(path), "%s/cpu%d/trace_pipe_raw", per_cpu_path, i); - out = fopen(path, "wb"); - if (out == NULL) + fd = open(path, O_WRONLY | O_CREAT, 0644); + if (fd < 0) goto out_fail; - ftrace_dump_buffer(out, cpu_buffer, global_pages, page_tmp); - fclose(out); + ftrace_dump_buffer(fd, cpu_buffer, global_pages, page_tmp); + close(fd); } free(page_tmp); @@ -727,6 +769,7 @@ static void ftrace_destroy_event_types(void) free(event_types[i]->fields); free(event_types[i]->system); free(event_types[i]->name); + free(event_types[i]->print_fmt); free(event_types[i]); } @@ -746,8 +789,8 @@ static int ftrace_init_event_types(void) read_value(event, ftrace_events, list_head, next); while (event != ftrace_events) { ulong call; - ulong name_addr, system_addr; - char name[128], system[128]; + ulong name_addr, system_addr, print_fmt_addr; + char name[128], system[128], print_fmt[4096]; int id; call = event - koffset(ftrace_event_call, list); @@ -756,11 +799,14 @@ static int ftrace_init_event_types(void) read_value(id, call, ftrace_event_call, id); read_value(name_addr, call, ftrace_event_call, name); read_value(system_addr, call, ftrace_event_call, system); + read_value(print_fmt_addr, call, ftrace_event_call, print_fmt); if (!read_string(name_addr, name, 128)) goto out_fail; if (!read_string(system_addr, system, 128)) goto out_fail; + if (!read_string(print_fmt_addr, print_fmt, 4096)) + goto out_fail; /* Enlarge event types array when need */ if (nr_event_types >= max_types) { @@ -782,6 +828,7 @@ static int ftrace_init_event_types(void) aevent_type->system = strdup(system); aevent_type->name = strdup(name); + aevent_type->print_fmt = strdup(print_fmt); aevent_type->id = id; aevent_type->nfields = 0; aevent_type->fields = NULL; @@ -812,6 +859,7 @@ static int ftrace_init_event_types(void) out_fail_free_aevent_type: free(aevent_type->system); free(aevent_type->name); + free(aevent_type->print_fmt); free(aevent_type); out_fail: ftrace_destroy_event_types(); @@ -868,6 +916,7 @@ static int ftrace_dump_event_type(struct event_type *t, const char *path) char format_path[PATH_MAX]; FILE *out; int i; + int common_field_count = 5; snprintf(format_path, sizeof(format_path), "%s/format", path); out = fopen(format_path, "w"); @@ -878,15 +927,40 @@ static int ftrace_dump_event_type(struct event_type *t, const char *path) fprintf(out, "ID: %d\n", t->id); fprintf(out, "format:\n"); - for (i = 0; i < t->nfields; i++) { - struct ftrace_field *f = &t->fields[i]; + for (i = t->nfields - 1; i >= 0; i--) { + /* + * Smartly shows the array type(except dynamic array). + * Normal: + * field:TYPE VAR + * If TYPE := TYPE[LEN], it is shown: + * field:TYPE VAR[LEN] + */ + struct ftrace_field *field = &t->fields[i]; + const char *array_descriptor = strchr(field->type, '['); + + if (!strncmp(field->type, "__data_loc", 10)) + array_descriptor = NULL; + + if (!array_descriptor) { + fprintf(out, "\tfield:%s %s;\toffset:%u;" + "\tsize:%u;\tsigned:%d;\n", + field->type, field->name, field->offset, + field->size, !!field->is_signed); + } else { + fprintf(out, "\tfield:%.*s %s%s;\toffset:%u;" + "\tsize:%u;\tsigned:%d;\n", + (int)(array_descriptor - field->type), + field->type, field->name, + array_descriptor, field->offset, + field->size, !!field->is_signed); + } - fprintf(out, "\tfield:%s %s;\toffset:%d;\tsize:%d;\n", - f->type, f->name, f->offset, f->size); + if (--common_field_count == 0) + fprintf(out, "\n"); } - /* TODO */ - fprintf(out, "\nprint fmt: \"unknow fmt from dump\"\n"); + fprintf(out, "\nprint fmt: %s\n", t->print_fmt); + fclose(out); return 0; @@ -918,9 +992,7 @@ static int ftrace_dump_event_types(const char *events_path) struct ring_buffer_per_cpu_stream { struct ring_buffer_per_cpu *cpu_buffer; - ulong *pages; void *curr_page; - int available_pages; int curr_page_indx; uint64_t ts; @@ -932,43 +1004,11 @@ static int ring_buffer_per_cpu_stream_init(struct ring_buffer_per_cpu *cpu_buffer, unsigned pages, struct ring_buffer_per_cpu_stream *s) { - unsigned i, count = 0; - s->cpu_buffer = cpu_buffer; s->curr_page = malloc(PAGESIZE()); if (s->curr_page == NULL) return -1; - s->pages = malloc(sizeof(ulong) * (pages + 1)); - if (s->pages == NULL) { - free(s->curr_page); - return -1; - } - - s->pages[count++] = cpu_buffer->reader_page; - - if (cpu_buffer->reader_page == cpu_buffer->commit_page) - goto pages_done; - - i = cpu_buffer->head_page_index; - for (;;) { - s->pages[count++] = cpu_buffer->pages[i]; - - if (cpu_buffer->pages[i] == cpu_buffer->commit_page) - break; - - i++; - if (i == pages) - i = 0; - - if (i == cpu_buffer->head_page_index) { - /* cpu_buffer->commit_page may be corrupted */ - break; - } - } - -pages_done: - s->available_pages = count; s->curr_page_indx = -1; return 0; } @@ -977,7 +1017,6 @@ static void ring_buffer_per_cpu_stream_destroy(struct ring_buffer_per_cpu_stream *s) { free(s->curr_page); - free(s->pages); } struct ftrace_event { @@ -1003,7 +1042,8 @@ int ring_buffer_per_cpu_stream_get_page(struct ring_buffer_per_cpu_stream *s) { ulong raw_page; - read_value(raw_page, s->pages[s->curr_page_indx], buffer_page, page); + read_value(raw_page, s->cpu_buffer->linear_pages[s->curr_page_indx], + buffer_page, page); if (!readmem(raw_page, KVADDR, s->curr_page, PAGESIZE(), "get page context", RETURN_ON_ERROR)) @@ -1027,18 +1067,18 @@ int ring_buffer_per_cpu_stream_pop_event(struct ring_buffer_per_cpu_stream *s, res->data = NULL; - if (s->curr_page_indx >= s->available_pages) + if (s->curr_page_indx >= s->cpu_buffer->nr_linear_pages) return -1; again: if ((s->curr_page_indx == -1) || (s->offset >= s->commit)) { s->curr_page_indx++; - if (s->curr_page_indx == s->available_pages) + if (s->curr_page_indx == s->cpu_buffer->nr_linear_pages) return -1; if (ring_buffer_per_cpu_stream_get_page(s) < 0) { - s->curr_page_indx = s->available_pages; + s->curr_page_indx = s->cpu_buffer->nr_linear_pages; return -1; } @@ -1350,6 +1390,39 @@ static int dump_saved_cmdlines(const char *dump_tracing_dir) return 0; } +static int dump_kallsyms(const char *dump_tracing_dir) +{ + char path[PATH_MAX]; + FILE *out; + int i; + struct syment *sp; + + snprintf(path, sizeof(path), "%s/kallsyms", dump_tracing_dir); + out = fopen(path, "w"); + if (out == NULL) + return -1; + + for (sp = st->symtable; sp < st->symend; sp++) + fprintf(out, "%lx %c %s\n", sp->value, sp->type, sp->name); + + for (i = 0; i < st->mods_installed; i++) { + struct load_module *lm = &st->load_modules[i]; + + for (sp = lm->mod_symtable; sp <= lm->mod_symend; sp++) { + if (!strncmp(sp->name, "_MODULE_", strlen("_MODULE_"))) + continue; + + fprintf(out, "%lx %c %s\t[%s]\n", sp->value, sp->type, + sp->name, lm->mod_name); + } + } + + fclose(out); + return 0; +} + +static int trace_cmd_data_output(int fd); + static void ftrace_dump(int argc, char *argv[]) { int c; @@ -1359,7 +1432,7 @@ static void ftrace_dump(int argc, char *argv[]) char path[PATH_MAX]; int ret; - while ((c = getopt(argc, argv, "sm")) != EOF) { + while ((c = getopt(argc, argv, "smt")) != EOF) { switch(c) { case 's': @@ -1368,6 +1441,23 @@ static void ftrace_dump(int argc, char *argv[]) case 'm': dump_meta_data = 1; break; + case 't': + if (dump_symbols || dump_meta_data || argc - optind > 1) + cmd_usage(pc->curcmd, SYNOPSIS); + else { + char *trace_dat; + int fd; + + if (argc - optind == 0) + trace_dat = "trace.dat"; + else if (argc - optind == 1) + trace_dat = argv[optind]; + fd = open(trace_dat, O_WRONLY | O_CREAT + | O_TRUNC, 0644); + trace_cmd_data_output(fd); + close(fd); + } + return; default: cmd_usage(pc->curcmd, SYNOPSIS); return; @@ -1413,10 +1503,7 @@ static void ftrace_dump(int argc, char *argv[]) if (dump_symbols) { /* Dump all symbols of the kernel */ - fprintf(fp, "\n-s option hasn't been implemented.\n"); - fprintf(fp, "symbols is not dumpped.\n"); - fprintf(fp, "You can use `sym -l > %s/kallsyms`\n\n", - dump_tracing_dir); + dump_kallsyms(dump_tracing_dir); } } @@ -2508,6 +2595,9 @@ static char *help_ftrace[] = { " the same as debugfs/tracing.", " -m: also dump metadata of ftrace.", " -s: also dump symbols of the kernel <not implemented>.", +"trace dump -t [output-file-name]", +" dump ring_buffers and all meta data to a file that can", +" be parsed by trace-cmd. Default output file name is \"trace.dat\".", NULL }; @@ -2536,3 +2626,521 @@ int _fini(void) return 1; } + +#define TRACE_CMD_FILE_VERSION_STRING "6" + +static inline int host_bigendian(void) +{ + unsigned char str[] = { 0x1, 0x2, 0x3, 0x4 }; + unsigned int *ptr; + + ptr = (unsigned int *)str; + return *ptr == 0x01020304; +} + +static char *tmp_file_buf; +static unsigned long long tmp_file_pos; +static unsigned long long tmp_file_size; +static int tmp_file_error; + +static int init_tmp_file(void) +{ + tmp_file_buf = malloc(4096); + if (tmp_file_buf == NULL) + return -1; + + tmp_file_pos = 0; + tmp_file_size = 4096; + tmp_file_error = 0; + + return 0; +} + +static void destory_tmp_file(void) +{ + free(tmp_file_buf); +} + +#define tmp_fprintf(fmt...) \ +do { \ + char *__buf = tmp_file_buf; \ + unsigned long long __pos; \ + \ + if (tmp_file_error) \ + break; \ + __pos = tmp_file_pos; \ + __pos += snprintf(__buf + __pos, tmp_file_size - __pos, fmt); \ + if (__pos > tmp_file_size) { \ + tmp_file_size = __pos + tmp_file_size; \ + __buf = realloc(__buf, tmp_file_size); \ + if (!__buf) { \ + tmp_file_error = 1; \ + break; \ + } \ + tmp_file_buf = __buf; \ + __pos = tmp_file_pos; \ + __pos += snprintf(__buf + __pos, tmp_file_size - __pos, fmt);\ + } \ + tmp_file_pos = __pos; \ +} while (0) + +static int tmp_file_record_size4(int fd) +{ + unsigned int size = tmp_file_pos; + + if (tmp_file_error) + return -1; + if (write_and_check(fd, &size, 4)) + return -1; + return 0; +} + +static int tmp_file_record_size8(int fd) +{ + if (tmp_file_error) + return -1; + if (write_and_check(fd, &tmp_file_pos, 8)) + return -1; + return 0; +} + +static int tmp_file_flush(int fd) +{ + if (tmp_file_error) + return -1; + if (write_and_check(fd, tmp_file_buf, tmp_file_pos)) + return -1; + tmp_file_pos = 0; + return 0; +} + +static int save_initial_data(int fd) +{ + int page_size; + char buf[20]; + + if (write_and_check(fd, "\027\010\104tracing", 10)) + return -1; + + if (write_and_check(fd, TRACE_CMD_FILE_VERSION_STRING, + strlen(TRACE_CMD_FILE_VERSION_STRING) + 1)) + return -1; + + /* Crash ensure core file endian and the host endian are the same */ + if (host_bigendian()) + buf[0] = 1; + else + buf[0] = 0; + + if (write_and_check(fd, buf, 1)) + return -1; + + /* save size of long (this may not be what the kernel is) */ + buf[0] = sizeof(long); + if (write_and_check(fd, buf, 1)) + return -1; + + page_size = PAGESIZE(); + if (write_and_check(fd, &page_size, 4)) + return -1; + + return 0; +} + +static int save_header_files(int fd) +{ + /* save header_page */ + if (write_and_check(fd, "header_page", 12)) + return -1; + + tmp_fprintf("\tfield: u64 timestamp;\toffset:0;\tsize:8;\tsigned:0;\n"); + + tmp_fprintf("\tfield: local_t commit;\toffset:8;\tsize:%u;\t" + "signed:1;\n", (unsigned int)sizeof(long)); + + tmp_fprintf("\tfield: int overwrite;\toffset:8;\tsize:%u;\tsigned:1;\n", + (unsigned int)sizeof(long)); + + tmp_fprintf("\tfield: char data;\toffset:%u;\tsize:%u;\tsigned:1;\n", + (unsigned int)(8 + sizeof(long)), + (unsigned int)(PAGESIZE() - 8 - sizeof(long))); + + if (tmp_file_record_size8(fd)) + return -1; + if (tmp_file_flush(fd)) + return -1; + + /* save header_event */ + if (write_and_check(fd, "header_event", 13)) + return -1; + + tmp_fprintf( + "# compressed entry header\n" + "\ttype_len : 5 bits\n" + "\ttime_delta : 27 bits\n" + "\tarray : 32 bits\n" + "\n" + "\tpadding : type == 29\n" + "\ttime_extend : type == 30\n" + "\tdata max type_len == 28\n" + ); + + if (tmp_file_record_size8(fd)) + return -1; + if (tmp_file_flush(fd)) + return -1; + + return 0; +} + +static int save_event_file(int fd, struct event_type *t) +{ + int i; + int common_field_count = 5; + + tmp_fprintf("name: %s\n", t->name); + tmp_fprintf("ID: %d\n", t->id); + tmp_fprintf("format:\n"); + + for (i = t->nfields - 1; i >= 0; i--) { + /* + * Smartly shows the array type(except dynamic array). + * Normal: + * field:TYPE VAR + * If TYPE := TYPE[LEN], it is shown: + * field:TYPE VAR[LEN] + */ + struct ftrace_field *field = &t->fields[i]; + const char *array_descriptor = strchr(field->type, '['); + + if (!strncmp(field->type, "__data_loc", 10)) + array_descriptor = NULL; + + if (!array_descriptor) { + tmp_fprintf("\tfield:%s %s;\toffset:%u;" + "\tsize:%u;\tsigned:%d;\n", + field->type, field->name, field->offset, + field->size, !!field->is_signed); + } else { + tmp_fprintf("\tfield:%.*s %s%s;\toffset:%u;" + "\tsize:%u;\tsigned:%d;\n", + (int)(array_descriptor - field->type), + field->type, field->name, + array_descriptor, field->offset, + field->size, !!field->is_signed); + } + + if (--common_field_count == 0) + tmp_fprintf("\n"); + } + + tmp_fprintf("\nprint fmt: %s\n", t->print_fmt); + + if (tmp_file_record_size8(fd)) + return -1; + return tmp_file_flush(fd); +} + +static int save_system_files(int fd, int *system_ids, int system_id) +{ + int i, total = 0; + + for (i = 0; i < nr_event_types; i++) { + if (system_ids[i] == system_id) + total++; + } + + if (write_and_check(fd, &total, 4)) + return -1; + + for (i = 0; i < nr_event_types; i++) { + if (system_ids[i] != system_id) + continue; + + if (save_event_file(fd, event_types[i])) + return -1; + } + + return 0; +} + +static int save_events_files(int fd) +{ + int system_id = 1, *system_ids; + const char *system = "ftrace"; + int i; + int nr_systems; + + system_ids = calloc(sizeof(*system_ids), nr_event_types); + if (system_ids == NULL) + return -1; + + for (;;) { + for (i = 0; i < nr_event_types; i++) { + if (system_ids[i]) + continue; + if (!system) { + system = event_types[i]->system; + system_ids[i] = system_id; + continue; + } + if (!strcmp(event_types[i]->system, system)) + system_ids[i] = system_id; + } + if (!system) + break; + system_id++; + system = NULL; + } + + /* ftrace events */ + if (save_system_files(fd, system_ids, 1)) + goto fail; + + /* other systems events */ + nr_systems = system_id - 2; + if (write_and_check(fd, &nr_systems, 4)) + goto fail; + for (system_id = 2; system_id < nr_systems + 2; system_id++) { + for (i = 0; i < nr_event_types; i++) { + if (system_ids[i] == system_id) + break; + } + if (write_and_check(fd, (void *)event_types[i]->system, + strlen(event_types[i]->system) + 1)) + goto fail; + if (save_system_files(fd, system_ids, system_id)) + goto fail; + } + + free(system_ids); + return 0; + +fail: + free(system_ids); + return -1; +} + +static int save_proc_kallsyms(int fd) +{ + int i; + struct syment *sp; + + for (sp = st->symtable; sp < st->symend; sp++) + tmp_fprintf("%lx %c %s\n", sp->value, sp->type, sp->name); + + for (i = 0; i < st->mods_installed; i++) { + struct load_module *lm = &st->load_modules[i]; + + for (sp = lm->mod_symtable; sp <= lm->mod_symend; sp++) { + if (!strncmp(sp->name, "_MODULE_", strlen("_MODULE_"))) + continue; + + tmp_fprintf("%lx %c %s\t[%s]\n", sp->value, sp->type, + sp->name, lm->mod_name); + } + } + + if (tmp_file_record_size4(fd)) + return -1; + return tmp_file_flush(fd); +} + +static int save_ftrace_printk(int fd) +{ + struct syment *s, *e; + long bprintk_fmt_s, bprintk_fmt_e; + char string[4096]; + long *address; + size_t i, count; + + s = symbol_search("__start___trace_bprintk_fmt"); + e = symbol_search("__stop___trace_bprintk_fmt"); + if (s == NULL || e == NULL) + return -1; + + bprintk_fmt_s = s->value; + bprintk_fmt_e = e->value; + count = (bprintk_fmt_e - bprintk_fmt_s) / sizeof(long); + + if (count == 0) { + unsigned int size = 0; + return write_and_check(fd, &size, 4); + } + + address = malloc(count * sizeof(long)); + if (address == NULL) + return -1; + + if (!readmem(bprintk_fmt_s, KVADDR, address, count * sizeof(long), + "get printk address", RETURN_ON_ERROR)) { + free(address); + return -1; + } + + for (i = 0; i < count; i++) { + size_t len = read_string(address[i], string, sizeof(string)); + if (!len) { + free(address); + return -1; + } + + tmp_fprintf("0x%lx : \"", address[i]); + + for (i = 0; string[i]; i++) { + switch (string[i]) { + case '\n': + tmp_fprintf("\\n"); + break; + case '\t': + tmp_fprintf("\\t"); + break; + case '\\': + tmp_fprintf("\\\\"); + break; + case '"': + tmp_fprintf("\\\""); + break; + default: + tmp_fprintf("%c", string[i]); + } + } + tmp_fprintf("\"\n"); + } + + free(address); + + if (tmp_file_record_size4(fd)) + return -1; + return tmp_file_flush(fd); +} + +static int save_ftrace_cmdlines(int fd) +{ + int i; + struct task_context *tc = FIRST_CONTEXT(); + + for (i = 0; i < RUNNING_TASKS(); i++) + tmp_fprintf("%d %s\n", (int)tc[i].pid, tc[i].comm); + + if (tmp_file_record_size8(fd)) + return -1; + return tmp_file_flush(fd); +} + +static int save_res_data(int fd, int nr_cpu_buffers) +{ + unsigned short option = 0; + + if (write_and_check(fd, &nr_cpu_buffers, 4)) + return -1; + + if (write_and_check(fd, "options ", 10)) + return -1; + + if (write_and_check(fd, &option, 2)) + return -1; + + if (write_and_check(fd, "flyrecord", 10)) + return -1; + + return 0; +} + +static int save_record_data(int fd, int nr_cpu_buffers) +{ + int i, j; + unsigned long long offset, buffer_offset; + void *page_tmp; + + offset = lseek(fd, 0, SEEK_CUR); + offset += nr_cpu_buffers * 16; + offset = (offset + (PAGESIZE() - 1)) & ~(PAGESIZE() - 1); + buffer_offset = offset; + + for (i = 0; i < nr_cpu_ids; i++) { + struct ring_buffer_per_cpu *cpu_buffer = &global_buffers[i]; + unsigned long long buffer_size; + + if (!cpu_buffer->kaddr) + continue; + + buffer_size = PAGESIZE() * cpu_buffer->nr_linear_pages; + if (write_and_check(fd, &buffer_offset, 8)) + return -1; + if (write_and_check(fd, &buffer_size, 8)) + return -1; + buffer_offset += buffer_size; + } + + page_tmp = malloc(PAGESIZE()); + if (page_tmp == NULL) + return -1; + + lseek(fd, offset, SEEK_SET); + for (i = 0; i < nr_cpu_ids; i++) { + struct ring_buffer_per_cpu *cpu_buffer = &global_buffers[i]; + + if (!cpu_buffer->kaddr) + continue; + + for (j = 0; j < cpu_buffer->nr_linear_pages; j++) { + if (ftrace_dump_page(fd, cpu_buffer->linear_pages[i], + page_tmp) < 0) { + free(page_tmp); + return -1; + } + } + } + + free(page_tmp); + + return 0; +} + +static int __trace_cmd_data_output(int fd) +{ + int i; + int nr_cpu_buffers = 0; + + for (i = 0; i < nr_cpu_ids; i++) { + struct ring_buffer_per_cpu *cpu_buffer = &global_buffers[i]; + + if (!cpu_buffer->kaddr) + continue; + + nr_cpu_buffers++; + } + + if (save_initial_data(fd)) + return -1; + if (save_header_files(fd)) + return -1; + if (save_events_files(fd)) /* ftrace events and other systems events */ + return -1; + if (save_proc_kallsyms(fd)) + return -1; + if (save_ftrace_printk(fd)) + return -1; + if (save_ftrace_cmdlines(fd)) + return -1; + if (save_res_data(fd, nr_cpu_buffers)) + return -1; + if (save_record_data(fd, nr_cpu_buffers)) + return -1; + + return 0; +} + +static int trace_cmd_data_output(int fd) +{ + int ret; + + if (init_tmp_file()) + return -1; + + ret = __trace_cmd_data_output(fd); + destory_tmp_file(); + + return ret; +} -- Crash-utility mailing list [email protected] https://www.redhat.com/mailman/listinfo/crash-utility
