The trace.c extension module moved to the separate repository: https://github.com/fujitsu/crash-trace
Remove the trace.c file from the crash repository and instead add trace.c.README file to point to the new repository for a while. Signed-off-by: Kazuhito Hagio <[email protected]> --- Lianbo, I can see that the spec file of RHEL's crash-trace-command points to the tarball in the crash-extensions repository, we can remove trace.c in the crash repository? extensions/trace.c | 2592 ------------------------------------- extensions/trace.c.README | 7 + 2 files changed, 7 insertions(+), 2592 deletions(-) delete mode 100644 extensions/trace.c create mode 100644 extensions/trace.c.README diff --git a/extensions/trace.c b/extensions/trace.c deleted file mode 100644 index c33907f98b00..000000000000 --- a/extensions/trace.c +++ /dev/null @@ -1,2592 +0,0 @@ -/* - * trace extension module for crash - * - * Copyright (C) 2009, 2010 FUJITSU LIMITED - * Author: Lai Jiangshan <[email protected]> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - */ - -#define _GNU_SOURCE -#include "defs.h" -#include <stdio.h> -#include <ctype.h> -#include <setjmp.h> -#include <stdlib.h> - -static int verbose = 0; - -static int nr_cpu_ids; - -/* - * lockless ring_buffer and old non-lockless ring_buffer are both supported. - */ -static int lockless_ring_buffer; -static int per_cpu_buffer_sizes; -/* - * global and encapsulated current_trace are both supported - */ -static int encapsulated_current_trace; -/* - * array_buffer (trace_buffer pre v5.6) is supported - */ -static int array_buffer_available; -/* - * max_buffer is supported - */ -static int max_buffer_available; -/* - * multiple trace instances are supported - */ -static int multiple_instances_available; - -/* - * buffer_page has "real_end" - */ -static int buffer_page_real_end_available; - -#define koffset(struct, member) struct##_##member##_offset - -static int koffset(trace_array, current_trace); -static int koffset(trace_array, array_buffer); -static int koffset(trace_array, max_buffer); -static int koffset(array_buffer, buffer); -static int koffset(trace_array, buffer); -static int koffset(tracer, name); - -static int koffset(trace_buffer, pages); -static int koffset(trace_buffer, flags); -static int koffset(trace_buffer, cpus); -static int koffset(trace_buffer, buffers); - -static int koffset(ring_buffer_per_cpu, cpu); -static int koffset(ring_buffer_per_cpu, pages); -static int koffset(ring_buffer_per_cpu, nr_pages); -static int koffset(ring_buffer_per_cpu, head_page); -static int koffset(ring_buffer_per_cpu, tail_page); -static int koffset(ring_buffer_per_cpu, commit_page); -static int koffset(ring_buffer_per_cpu, reader_page); -static int koffset(ring_buffer_per_cpu, overrun); -static int koffset(ring_buffer_per_cpu, entries); - -static int koffset(buffer_page, read); -static int koffset(buffer_page, list); -static int koffset(buffer_page, page); -static int koffset(buffer_page, real_end); - -static int koffset(list_head, next); - -static int koffset(ftrace_event_call, list); - -static int koffset(ftrace_event_field, link); -static int koffset(ftrace_event_field, name); -static int koffset(ftrace_event_field, type); -static int koffset(ftrace_event_field, offset); -static int koffset(ftrace_event_field, size); -static int koffset(ftrace_event_field, is_signed); - -static int koffset(trace_array, name); - -static int koffset(POINTER_SYM, POINTER) = 0; - -struct ring_buffer_per_cpu { - ulong kaddr; - - ulong head_page; - ulong tail_page; - ulong commit_page; - ulong reader_page; - ulong real_head_page; - - int head_page_index; - unsigned long nr_pages; - ulong *pages; - - ulong *linear_pages; - int nr_linear_pages; - - ulong overrun; - ulong entries; -}; - -static ulong global_trace; -static ulong max_tr_trace; - -struct trace_instance { - char name[NAME_MAX + 1]; - ulong array_buffer; - ulong max_buffer; - ulong trace_buffer; - unsigned pages; - struct ring_buffer_per_cpu *buffers; - - ulong max_tr_ring_buffer; - unsigned max_tr_pages; - struct ring_buffer_per_cpu *max_tr_buffers; -}; - -static ulong ftrace_trace_arrays; -static struct trace_instance global_trace_instance; -static struct trace_instance *trace_instances = NULL; -static int instance_count; - -static ulong ftrace_events; -static ulong current_trace; -static const char *current_tracer_name; - -static void ftrace_destroy_event_types(void); -static int ftrace_init_event_types(void); - -/* at = ((struct *)ptr)->member */ -#define read_value(at, ptr, struct, member) \ - do { \ - if (!readmem(ptr + koffset(struct, member), KVADDR, \ - &at, sizeof(at), #struct "'s " #member, \ - RETURN_ON_ERROR)) \ - goto out_fail;\ - } while (0) - -/* 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 - -static int init_offsets(void) -{ -#define check_offset(struct, member) do { \ - if (koffset(struct, member) < 0) { \ - fprintf(fp, "failed to init the offset, struct:"\ - #struct ", member:" #member); \ - fprintf(fp, "\n"); \ - return -1; \ - } \ - } while (0) - -#define init_offset(struct, member) do { \ - koffset(struct, member) = MEMBER_OFFSET(#struct, #member); \ - check_offset(struct, member); \ - } while (0) - -#define init_offset_alternative(struct, member, alt_struct, alt_member) do { \ - koffset(struct, member) = MEMBER_OFFSET(#alt_struct, #alt_member); \ - check_offset(struct, member); \ - } while (0) - - if (encapsulated_current_trace) - init_offset(trace_array, current_trace); - - if (array_buffer_available) { - if (MEMBER_EXISTS("trace_array", "array_buffer")) { - init_offset(trace_array, array_buffer); - init_offset(array_buffer, buffer); - } else { - init_offset_alternative(trace_array, array_buffer, - trace_array, trace_buffer); - init_offset_alternative(array_buffer, buffer, - trace_buffer, buffer); - } - - if (max_buffer_available) - init_offset(trace_array, max_buffer); - } else { - init_offset(trace_array, buffer); - } - init_offset(tracer, name); - - if (MEMBER_EXISTS("ring_buffer_per_cpu", "nr_pages")) { - per_cpu_buffer_sizes = 1; - if (verbose) - fprintf(fp, "per cpu buffer sizes\n"); - } - - if (machine_type("PPC64") && kernel_symbol_exists(".ring_buffer_read")) - gdb_set_crash_scope(symbol_value(".ring_buffer_read"), ".ring_buffer_read"); - else if (kernel_symbol_exists("ring_buffer_read")) - gdb_set_crash_scope(symbol_value("ring_buffer_read"), "ring_buffer_read"); - - if (STREQ(MEMBER_TYPE_NAME("trace_buffer", "buffer"), "ring_buffer")) { - if (!per_cpu_buffer_sizes) - init_offset_alternative(trace_buffer, pages, ring_buffer, pages); - init_offset_alternative(trace_buffer, flags, ring_buffer, flags); - init_offset_alternative(trace_buffer, cpus, ring_buffer, cpus); - init_offset_alternative(trace_buffer, buffers, ring_buffer, buffers); - } else { - if (!per_cpu_buffer_sizes) - init_offset(trace_buffer, pages); - init_offset(trace_buffer, flags); - init_offset(trace_buffer, cpus); - init_offset(trace_buffer, buffers); - } - - if (MEMBER_SIZE("ring_buffer_per_cpu", "pages") == sizeof(ulong)) { - lockless_ring_buffer = 1; - if (verbose) - fprintf(fp, "lockless\n"); - } - - if (per_cpu_buffer_sizes) - init_offset(ring_buffer_per_cpu, nr_pages); - init_offset(ring_buffer_per_cpu, cpu); - init_offset(ring_buffer_per_cpu, pages); - init_offset(ring_buffer_per_cpu, head_page); - init_offset(ring_buffer_per_cpu, tail_page); - init_offset(ring_buffer_per_cpu, commit_page); - init_offset(ring_buffer_per_cpu, reader_page); - init_offset(ring_buffer_per_cpu, overrun); - init_offset(ring_buffer_per_cpu, entries); - - init_offset(buffer_page, read); - init_offset(buffer_page, list); - init_offset(buffer_page, page); - init_offset(buffer_page, real_end); - - init_offset(list_head, next); - - koffset(ftrace_event_call, list) = MAX(MEMBER_OFFSET("ftrace_event_call", "list"), - MEMBER_OFFSET("trace_event_call", "list")); - if (koffset(ftrace_event_call, list) < 0) { - fprintf(fp, "failed to init the offset, struct:[f]trace_event_call member:list)\n"); - return -1; \ - } - - init_offset(ftrace_event_field, link); - init_offset(ftrace_event_field, name); - init_offset(ftrace_event_field, type); - init_offset(ftrace_event_field, offset); - init_offset(ftrace_event_field, size); - init_offset(ftrace_event_field, is_signed); - - if (MEMBER_EXISTS("trace_array", "name")) - init_offset(trace_array, name); - - return 0; -#undef init_offset -} - -static void print_offsets(void) -{ - if (!verbose) - return; - -#define print_offset(struct, member) fprintf(fp, \ - "koffset(" #struct ", " #member ") = %d\n", koffset(struct, member)) - - print_offset(trace_array, buffer); - print_offset(tracer, name); - - print_offset(trace_buffer, pages); - print_offset(trace_buffer, flags); - print_offset(trace_buffer, cpus); - print_offset(trace_buffer, buffers); - - print_offset(ring_buffer_per_cpu, cpu); - print_offset(ring_buffer_per_cpu, pages); - print_offset(ring_buffer_per_cpu, head_page); - print_offset(ring_buffer_per_cpu, tail_page); - print_offset(ring_buffer_per_cpu, commit_page); - print_offset(ring_buffer_per_cpu, reader_page); - print_offset(ring_buffer_per_cpu, overrun); - print_offset(ring_buffer_per_cpu, entries); - - print_offset(buffer_page, read); - print_offset(buffer_page, list); - print_offset(buffer_page, page); - print_offset(buffer_page, real_end); - - print_offset(list_head, next); - - print_offset(ftrace_event_call, list); - - print_offset(ftrace_event_field, link); - print_offset(ftrace_event_field, name); - print_offset(ftrace_event_field, type); - print_offset(ftrace_event_field, offset); - print_offset(ftrace_event_field, size); - print_offset(ftrace_event_field, is_signed); -#undef print_offset -} - -static int buffer_page_has_data(ulong page) -{ - uint end; - - if (!buffer_page_real_end_available) - return 1; - - /* Only write pages with data in it */ - read_value(end, page, buffer_page, real_end); - return end; -out_fail: - return 0; -} - -static int ftrace_init_pages(struct ring_buffer_per_cpu *cpu_buffer, - unsigned nr_pages) -{ - unsigned j = 0, count = 0; - ulong head, page; - ulong real_head_page = cpu_buffer->head_page; - - cpu_buffer->pages = calloc(sizeof(ulong), nr_pages); - if (cpu_buffer->pages == NULL) - return -1; - - cpu_buffer->linear_pages = calloc(sizeof(ulong), nr_pages + 1); - if (cpu_buffer->linear_pages == NULL) { - 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); - } else - head = cpu_buffer->kaddr + koffset(ring_buffer_per_cpu, pages); - - page = head; - for (;;) { - read_value(page, page, list_head, next); - if (page & 3) { - /* lockless_ring_buffer */ - page &= ~3; - real_head_page = page - koffset(buffer_page, list); - } - - if (j == nr_pages) - break; - - if (page == head) { - error(INFO, "Num of pages is less than %d\n", nr_pages); - goto out_fail; - } - - cpu_buffer->pages[j++] = page - koffset(buffer_page, list); - } - - if (page != head) { - error(INFO, "Num of pages is larger than %d\n", nr_pages); - goto out_fail; - } - - /* find head page and head_page_index */ - - cpu_buffer->real_head_page = real_head_page; - cpu_buffer->head_page_index = -1; - - for (j = 0; j < nr_pages; j++) { - if (cpu_buffer->pages[j] == real_head_page) { - cpu_buffer->head_page_index = j; - break; - } - } - - if (cpu_buffer->head_page_index == -1) { - error(INFO, "error for resolve head_page_index\n"); - goto out_fail; - } - - /* Setup linear pages */ - - if (buffer_page_has_data(cpu_buffer->reader_page)) - 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: - return -1; -} - -static void ftrace_destroy_buffers(struct ring_buffer_per_cpu *buffers) -{ - int i; - - for (i = 0; i < nr_cpu_ids; i++) { - if (!buffers[i].kaddr) - continue; - - free(buffers[i].pages); - free(buffers[i].linear_pages); - } -} - -static int ftrace_init_buffers(struct ring_buffer_per_cpu *buffers, - ulong trace_buffer, unsigned pages) -{ - int i; - ulong buffers_array; - - read_value(buffers_array, trace_buffer, trace_buffer, buffers); - - for (i = 0; i < nr_cpu_ids; i++) { - if (!readmem(buffers_array + sizeof(ulong) * i, KVADDR, - &buffers[i].kaddr, sizeof(ulong), - "ring_buffer's cpu buffer", RETURN_ON_ERROR)) - goto out_fail; - - if (!buffers[i].kaddr) - continue; - -#define buffer_read_value(member) read_value(buffers[i].member, \ - buffers[i].kaddr, ring_buffer_per_cpu, member) - - buffer_read_value(head_page); - buffer_read_value(tail_page); - buffer_read_value(commit_page); - buffer_read_value(reader_page); - buffer_read_value(overrun); - buffer_read_value(entries); - if (per_cpu_buffer_sizes) { - if (MEMBER_SIZE("ring_buffer_per_cpu", "nr_pages") == sizeof(unsigned int)) { - unsigned int tmp_nr_pages; - read_value(tmp_nr_pages, buffers[i].kaddr, ring_buffer_per_cpu, nr_pages); - buffers[i].nr_pages = (unsigned long) tmp_nr_pages; - } else { - buffer_read_value(nr_pages); - } - pages = buffers[i].nr_pages; - } else - buffers[i].nr_pages = pages; - -#undef buffer_read_value - - if (ftrace_init_pages(buffers + i, pages) < 0) - goto out_fail; - - if (verbose) { - fprintf(fp, "overrun=%lu\n", buffers[i].overrun); - fprintf(fp, "entries=%lu\n", buffers[i].entries); - } - } - - return 0; - -out_fail: - ftrace_destroy_buffers(buffers); - return -1; -} - -static int ftrace_init_trace(struct trace_instance *ti, ulong instance_addr) -{ - if (array_buffer_available) { - ti->array_buffer = instance_addr + - koffset(trace_array, array_buffer); - read_value(ti->trace_buffer, ti->array_buffer, - array_buffer, buffer); - - if (max_buffer_available) { - ti->max_buffer = instance_addr + - koffset(trace_array, max_buffer); - read_value(ti->max_tr_ring_buffer, ti->max_buffer, - array_buffer, buffer); - } - } else { - read_value(ti->trace_buffer, instance_addr, trace_array, buffer); - read_value(ti->pages, ti->trace_buffer, trace_buffer, pages); - - read_value(ti->max_tr_ring_buffer, max_tr_trace, trace_array, buffer); - if (ti->max_tr_ring_buffer) - read_value(ti->max_tr_pages, ti->max_tr_ring_buffer, trace_buffer, pages); - } - - ti->buffers = calloc(sizeof(*ti->buffers), nr_cpu_ids); - if (ti->buffers == NULL) - goto out_fail; - - if (ftrace_init_buffers(ti->buffers, ti->trace_buffer, - ti->pages) < 0) - goto out_fail; - - if (!ti->max_tr_ring_buffer) - return 0; - - ti->max_tr_buffers = calloc(sizeof(*ti->max_tr_buffers), nr_cpu_ids); - if (ti->max_tr_buffers == NULL) - goto out_fail; - - if (ftrace_init_buffers(ti->max_tr_buffers, ti->max_tr_ring_buffer, - ti->max_tr_pages) < 0) - goto out_fail; - - return 0; - -out_fail: - free(ti->max_tr_buffers); - free(ti->buffers); - return -1; -} - -static void ftrace_destroy_all_instance_buffers() -{ - int i; - - for (i = 0; i < instance_count; i++) - { - struct trace_instance *ti = &trace_instances[i]; - - if (ti->max_tr_ring_buffer) { - ftrace_destroy_buffers(ti->max_tr_buffers); - free(ti->max_tr_buffers); - } - - ftrace_destroy_buffers(ti->buffers); - free(ti->buffers); - } -} - -static void ftrace_destroy_instances() -{ - ftrace_destroy_all_instance_buffers(); - free(trace_instances); -} - -static int ftrace_init_instances() -{ - int i; - struct trace_instance *ti; - struct list_data list_data; - struct list_data *ld = &list_data; - - if (!multiple_instances_available) - return 0; - - BZERO(ld, sizeof(struct list_data)); - ld->start = ftrace_trace_arrays; - ld->end = global_trace; - ld->flags = LIST_ALLOCATE; - instance_count = do_list(ld); - - /* The do_list count includes the list_head, which is not a - * proper instance */ - instance_count--; - if (instance_count <= 0) - return 0; - - trace_instances = calloc(sizeof(struct trace_instance), instance_count); - - /* We start i at 1 to skip over the list_head and continue to the last - * instance, which lies at index instance_count */ - for (i = 1; i <= instance_count; i++) - { - ulong instance_ptr; - ulong name_addr; - int ret; - - ti = &trace_instances[i-1]; - instance_ptr = ld->list_ptr[i]; - read_value(name_addr, instance_ptr, trace_array, name); - if (!name_addr) - { - console("Instance name is NULL\n"); - } - else if (!read_string(name_addr, ti->name, sizeof(ti->name))) - { - console("Failed to read instance name at address %p\n", (void*)name_addr); - goto out_fail; - } - - ret = ftrace_init_trace(ti, instance_ptr); - if (ret < 0) - goto out_fail; - } - FREEBUF(ld->list_ptr); - - return 0; - -out_fail: - /* We've already freed the current instance's trace buffer info, so - * we'll clear that out to avoid double freeing in - * ftrace_destroy_instances() */ - BZERO(ti, sizeof(struct trace_instance)); - ftrace_destroy_instances(); - - return -1; -} - -static int ftrace_init_current_tracer(void) -{ - ulong addr; - char tmp[128]; - - /* Get current tracer name */ - if (encapsulated_current_trace) { - read_value(addr, global_trace, trace_array, current_trace); - } else { - read_value(addr, current_trace, POINTER_SYM, POINTER); - } - - read_value(addr, addr, tracer, name); - read_string(addr, tmp, 128); - - current_tracer_name = strdup(tmp); - if (current_tracer_name == NULL) - goto out_fail; - - return 0; - -out_fail: - return -1; -} - -static int ftrace_init(void) -{ - struct syment *sym_global_trace; - struct syment *sym_max_tr_trace; - struct syment *sym_ftrace_events; - struct syment *sym_current_trace; - struct syment *sym_ftrace_trace_arrays; - - sym_global_trace = symbol_search("global_trace"); - sym_ftrace_events = symbol_search("ftrace_events"); - sym_ftrace_trace_arrays = symbol_search("ftrace_trace_arrays"); - - if (sym_global_trace == NULL || sym_ftrace_events == NULL) - return -1; - - global_trace = sym_global_trace->value; - ftrace_events = sym_ftrace_events->value; - - if (sym_ftrace_trace_arrays) - { - multiple_instances_available = 1; - ftrace_trace_arrays = sym_ftrace_trace_arrays->value; - } - - if (MEMBER_EXISTS("buffer_page", "real_end")) - buffer_page_real_end_available = 1; - - if (MEMBER_EXISTS("trace_array", "current_trace")) { - encapsulated_current_trace = 1; - } else { - sym_current_trace = symbol_search("current_trace"); - if (sym_current_trace == NULL) - return -1; - - current_trace = sym_current_trace->value; - } - - if (MEMBER_EXISTS("trace_array", "array_buffer") || - MEMBER_EXISTS("trace_array", "trace_buffer")) { - array_buffer_available = 1; - - if (MEMBER_EXISTS("trace_array", "max_buffer")) - max_buffer_available = 1; - } else { - sym_max_tr_trace = symbol_search("max_tr"); - if (sym_max_tr_trace == NULL) - return -1; - - max_tr_trace = sym_max_tr_trace->value; - } - - if (!try_get_symbol_data("nr_cpu_ids", sizeof(int), &nr_cpu_ids)) - nr_cpu_ids = 1; - - if (init_offsets() < 0) - return -1; - print_offsets(); - - if (ftrace_init_trace(&global_trace_instance, global_trace) < 0) - goto out_0; - - if (ftrace_init_instances() < 0) - goto out_1; - - if (ftrace_init_event_types() < 0) - goto out_2; - - if (ftrace_init_current_tracer() < 0) - goto out_3; - - return 0; - -out_3: - ftrace_destroy_event_types(); -out_2: - ftrace_destroy_instances(); -out_1: - if (global_trace_instance.max_tr_ring_buffer) { - ftrace_destroy_buffers(global_trace_instance.max_tr_buffers); - free(global_trace_instance.max_tr_buffers); - } - ftrace_destroy_buffers(global_trace_instance.buffers); - free(global_trace_instance.buffers); -out_0: - return -1; -} - -static void ftrace_destroy(void) -{ - free(current_tracer_name); - ftrace_destroy_event_types(); - - ftrace_destroy_instances(); - - if (global_trace_instance.max_tr_ring_buffer) { - ftrace_destroy_buffers(global_trace_instance.max_tr_buffers); - free(global_trace_instance.max_tr_buffers); - } - - ftrace_destroy_buffers(global_trace_instance.buffers); - free(global_trace_instance.buffers); -} - -static int ftrace_dump_page(int fd, ulong page, void *page_tmp) -{ - ulong raw_page; - - read_value(raw_page, page, buffer_page, page); - - if (!readmem(raw_page, KVADDR, page_tmp, PAGESIZE(), "get page context", - RETURN_ON_ERROR)) - goto out_fail; - - if (write_and_check(fd, page_tmp, PAGESIZE())) - return -1; - - return 0; - -out_fail: - return -1; -} - -static -void ftrace_dump_buffer(int fd, struct ring_buffer_per_cpu *cpu_buffer, - unsigned pages, void *page_tmp) -{ - int i; - - for (i = 0; i < cpu_buffer->nr_linear_pages; i++) { - if (ftrace_dump_page(fd, cpu_buffer->linear_pages[i], - page_tmp) < 0) - break; - } -} - -static int try_mkdir(const char *pathname, mode_t mode) -{ - int ret; - - ret = mkdir(pathname, mode); - if (ret < 0) { - if (errno == EEXIST) - return 0; - - error(INFO, "mkdir failed\n"); - return -1; - } - - return 0; -} - -static int ftrace_dump_buffers(const char *per_cpu_path, - struct trace_instance *ti) -{ - int i; - void *page_tmp; - char path[PATH_MAX]; - int fd; - - page_tmp = malloc(PAGESIZE()); - if (page_tmp == NULL) - return -1; - - for (i = 0; i < nr_cpu_ids; i++) { - struct ring_buffer_per_cpu *cpu_buffer = &ti->buffers[i]; - - if (!cpu_buffer->kaddr) - continue; - - snprintf(path, sizeof(path), "%s/cpu%d", per_cpu_path, i); - if (try_mkdir(path, 0755) < 0) - goto out_fail; - - snprintf(path, sizeof(path), "%s/cpu%d/trace_pipe_raw", - per_cpu_path, i); - fd = open(path, O_WRONLY | O_CREAT, 0644); - if (fd < 0) - goto out_fail; - - ftrace_dump_buffer(fd, cpu_buffer, ti->pages, page_tmp); - close(fd); - } - - free(page_tmp); - return 0; - -out_fail: - free(page_tmp); - return -1; -} - -#define MAX_CACHE_ID 256 - -struct ftrace_field { - const char *name; - const char *type; - int offset; - int size; - int is_signed; -}; - -struct event_type { - struct event_type *next; - const char *system; - const char *name; - int plugin; - const char *print_fmt; - int id; - int nfields; - struct ftrace_field *fields; -}; - -static struct event_type *event_type_cache[MAX_CACHE_ID]; -static struct event_type **event_types; -static int nr_event_types; - -static struct ftrace_field *ftrace_common_fields; -static int ftrace_common_fields_count; - -static int syscall_get_enter_fields(ulong call, ulong *fields) -{ - static int inited; - static int data_offset; - static int enter_fields_offset; - - ulong metadata; - - if (inited) - goto work; - - inited = 1; - data_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "data"), - MEMBER_OFFSET("trace_event_call", "data")); - if (data_offset < 0) { - /* - * rhel-7.6 moved the .data member into an anonymous union. - */ - if (MEMBER_EXISTS("ftrace_event_call", "rh_data") && - MEMBER_EXISTS("ftrace_event_data", "data")) { - data_offset = MEMBER_OFFSET("ftrace_event_call", "rh_data") + - MEMBER_OFFSET("ftrace_event_data", "data"); - inited = 2; - } else - return -1; - } - - enter_fields_offset = MEMBER_OFFSET("syscall_metadata", "enter_fields"); - if (enter_fields_offset < 0) - return -1; - -work: - if (data_offset < 0 || enter_fields_offset < 0) - return -1; - - if (!readmem(call + data_offset, KVADDR, &metadata, sizeof(metadata), - "read ftrace_event_call data", RETURN_ON_ERROR)) - return -1; - - if (inited == 2) { - if (!readmem(metadata, KVADDR, &metadata, sizeof(metadata), - "read ftrace_event_call data (indirect rh_data)", RETURN_ON_ERROR)) - return -1; - } - - *fields = metadata + enter_fields_offset; - return 0; -} - -static int syscall_get_exit_fields_old(ulong call, ulong *fields) -{ - static int inited; - static int data_offset; - static int exit_fields_offset; - - ulong metadata; - - if (inited) - goto work; - - inited = 1; - data_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "data"), - MEMBER_OFFSET("trace_event_call", "data")); - if (data_offset < 0) - return -1; - - exit_fields_offset = MEMBER_OFFSET("syscall_metadata", "exit_fields"); - if (exit_fields_offset < 0) - return -1; - -work: - if (data_offset < 0 || exit_fields_offset < 0) - return -1; - - if (!readmem(call + data_offset, KVADDR, &metadata, sizeof(metadata), - "read ftrace_event_call data", RETURN_ON_ERROR)) - return -1; - - *fields = metadata + exit_fields_offset; - return 0; -} - -static int syscall_get_exit_fields(ulong call, ulong *fields) -{ - static int inited; - static ulong syscall_exit_fields_value; - - if (!inited) { - struct syment *sp; - - if (!(sp = symbol_search("syscall_exit_fields"))) { - inited = -1; - } else { - syscall_exit_fields_value = sp->value; - inited = 1; - } - } - - if (inited == -1) - return syscall_get_exit_fields_old(call, fields); - - *fields = syscall_exit_fields_value; - - return 0; -} - -static -int ftrace_get_event_type_fields(ulong call, ulong *fields) -{ - static int inited; - static int fields_offset; - static int class_offset; - static int get_fields_offset; - static ulong syscall_get_enter_fields_value; - static ulong syscall_get_exit_fields_value; - - struct syment *sp; - ulong class, get_fields; - - if (inited) - goto work; - - inited = 1; - fields_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "fields"), - MEMBER_OFFSET("trace_event_call", "fields")); - - class_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "class"), - MEMBER_OFFSET("trace_event_call", "class")); - if (class_offset < 0) - goto work; - - inited = 2; - fields_offset = MAX(MEMBER_OFFSET("ftrace_event_class", "fields"), - MEMBER_OFFSET("trace_event_class", "fields")); - if (fields_offset < 0) - return -1; - - get_fields_offset = MAX(MEMBER_OFFSET("ftrace_event_class", "get_fields"), - MEMBER_OFFSET("trace_event_class", "get_fields")); - if ((sp = symbol_search("syscall_get_enter_fields")) != NULL) - syscall_get_enter_fields_value = sp->value; - if ((sp = symbol_search("syscall_get_exit_fields")) != NULL) - syscall_get_exit_fields_value = sp->value; - -work: - if (fields_offset < 0) - return -1; - - if (inited == 1) { - *fields = call + fields_offset; - return 0; - } - - if (!readmem(call + class_offset, KVADDR, &class, sizeof(class), - "read ftrace_event_call class", RETURN_ON_ERROR)) - return -1; - - if (!readmem(class + get_fields_offset, KVADDR, &get_fields, - sizeof(get_fields), "read ftrace_event_call get_fields", - RETURN_ON_ERROR)) - return -1; - - if (!get_fields) { - *fields = class + fields_offset; - return 0; - } - - if (get_fields == syscall_get_enter_fields_value) - return syscall_get_enter_fields(call, fields); - - if (get_fields == syscall_get_exit_fields_value) - return syscall_get_exit_fields(call, fields); - - fprintf(fp, "Unkown get_fields function\n"); - return -1; -} - -static int ftrace_init_event_fields(ulong fields_head, int *pnfields, - struct ftrace_field **pfields) -{ - ulong pos; - - int nfields = 0, max_fields = 16; - struct ftrace_field *fields = NULL; - - read_value(pos, fields_head, list_head, next); - - if (pos == 0) { - if (verbose) - fprintf(fp, "no field, head: %lu\n", fields_head); - return 0; - } - - fields = malloc(sizeof(*fields) * max_fields); - if (fields == NULL) - return -1; - - while (pos != fields_head) { - ulong field; - ulong name_addr, type_addr; - char field_name[128], field_type[128]; - int offset, size, is_signed; - - field = pos - koffset(ftrace_event_field, link); - - /* Read a field from the core */ - read_value(name_addr, field, ftrace_event_field, name); - read_value(type_addr, field, ftrace_event_field, type); - read_value(offset, field, ftrace_event_field, offset); - read_value(size, field, ftrace_event_field, size); - read_value(is_signed, field, ftrace_event_field, is_signed); - - if (!read_string(name_addr, field_name, 128)) - goto out_fail; - if (!read_string(type_addr, field_type, 128)) - goto out_fail; - - /* Enlarge fields array when need */ - if (nfields >= max_fields) { - void *tmp; - - max_fields = nfields * 2; - tmp = realloc(fields, sizeof(*fields) * max_fields); - if (tmp == NULL) - goto out_fail; - - fields = tmp; - } - - /* Set up and Add a field */ - fields[nfields].offset = offset; - fields[nfields].size = size; - fields[nfields].is_signed = is_signed; - - fields[nfields].name = strdup(field_name); - if (fields[nfields].name == NULL) - goto out_fail; - - fields[nfields].type = strdup(field_type); - if (fields[nfields].type == NULL) { - free(fields[nfields].name); - goto out_fail; - } - - nfields++; - - /* Advance to the next field */ - read_value(pos, pos, list_head, next); - } - - *pnfields = nfields; - *pfields = fields; - - return 0; - -out_fail: - for (nfields--; nfields >= 0; nfields--) { - free(fields[nfields].name); - free(fields[nfields].type); - } - - free(fields); - return -1; -} - -static int ftrace_init_event_type(ulong call, struct event_type *aevent_type) -{ - ulong fields_head = 0; - - if (ftrace_get_event_type_fields(call, &fields_head) < 0) - return -1; - - return ftrace_init_event_fields(fields_head, &aevent_type->nfields, - &aevent_type->fields); -} - -static int ftrace_init_common_fields(void) -{ - ulong ftrace_common_fields_head; - struct syment *sp; - - sp = symbol_search("ftrace_common_fields"); - if (!sp) - return 0; - - ftrace_common_fields_head = sp->value; - - return ftrace_init_event_fields(ftrace_common_fields_head, - &ftrace_common_fields_count, &ftrace_common_fields); -} - -static void ftrace_destroy_event_types(void) -{ - int i, j; - - for (i = 0; i < nr_event_types; i++) { - for (j = 0; j < event_types[i]->nfields; j++) { - free(event_types[i]->fields[j].name); - free(event_types[i]->fields[j].type); - } - - 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]); - } - - free(event_types); - free(ftrace_common_fields); -} - -static -int ftrace_get_event_type_name(ulong call, char *name, int len) -{ - static int inited; - static int name_offset; - static int flags_offset; - static int tp_name_offset; - static long tracepoint_flag; - - uint flags; - ulong name_addr; - - if (inited) - goto work; - - name_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "tp"), - MEMBER_OFFSET("trace_event_call", "tp")); - if (name_offset >= 0) { - flags_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "flags"), - MEMBER_OFFSET("trace_event_call", "flags")); - if (flags_offset < 0) - return -1; - - tp_name_offset = MEMBER_OFFSET("tracepoint", "name"); - if (tp_name_offset < 0) - return -1; - - if (!enumerator_value("TRACE_EVENT_FL_TRACEPOINT", &tracepoint_flag)) - return -1; - - inited = 2; - } else { - name_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "name"), - MEMBER_OFFSET("trace_event_call", "name")); - inited = 1; - } - -work: - if (name_offset < 0) - return -1; - - if (!readmem(call + name_offset, KVADDR, &name_addr, sizeof(name_addr), - "read ftrace_event_call name_addr", RETURN_ON_ERROR)) - return -1; - - if (inited == 2) { - if (!readmem(call + flags_offset, KVADDR, &flags, - sizeof(flags), "read ftrace_event_call flags", - RETURN_ON_ERROR)) - return -1; - - if (flags & (uint)tracepoint_flag) { - if (!readmem(name_addr + tp_name_offset, KVADDR, - &name_addr, sizeof(name_addr), - "read tracepoint name", RETURN_ON_ERROR)) - return -1; - } - - } - - if (!read_string(name_addr, name, len)) - return -1; - - return 0; -} - -static -int ftrace_get_event_type_system(ulong call, char *system, int len) -{ - static int inited; - static int sys_offset; - static int class_offset; - - ulong ptr = call; - ulong sys_addr; - - if (inited) - goto work; - - inited = 1; - sys_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "system"), - MEMBER_OFFSET("trace_event_call", "system")); - - if (sys_offset >= 0) - goto work; - - class_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "class"), - MEMBER_OFFSET("trace_event_call", "class")); - if (class_offset < 0) - return -1; - - sys_offset = MAX(MEMBER_OFFSET("ftrace_event_class", "system"), - MEMBER_OFFSET("trace_event_class", "system")); - inited = 2; - -work: - if (sys_offset < 0) - return -1; - - if (inited == 2 && !readmem(call + class_offset, KVADDR, &ptr, - sizeof(ptr), "read ftrace_event_call class_addr", - RETURN_ON_ERROR)) - return -1; - - if (!readmem(ptr + sys_offset, KVADDR, &sys_addr, sizeof(sys_addr), - "read ftrace_event_call sys_addr", RETURN_ON_ERROR)) - return -1; - - if (!read_string(sys_addr, system, len)) - return -1; - - return 0; -} - -static int read_long_string(ulong kvaddr, char **buf) -{ - char strbuf[MIN_PAGE_SIZE], *ret_buf = NULL; - ulong kp; - int cnt1, cnt2, size; - -again: - kp = kvaddr; - size = 0; - - for (;;) { - cnt1 = MIN_PAGE_SIZE - (kp & (MIN_PAGE_SIZE-1)); - - if (!readmem(kp, KVADDR, strbuf, cnt1, - "readstring characters", QUIET|RETURN_ON_ERROR)) - return -1; - - cnt2 = strnlen(strbuf, cnt1); - if (ret_buf) - memcpy(ret_buf + size, strbuf, cnt2); - kp += cnt2; - size += cnt2; - - if (cnt2 < cnt1) { - if (ret_buf) { - break; - } else { - ret_buf = malloc(size + 1); - if (!ret_buf) - return -1; - goto again; - } - } - } - - ret_buf[size] = '\0'; - *buf = ret_buf; - return size; -} - -static -int ftrace_get_event_type_print_fmt(ulong call, char **print_fmt) -{ - static int inited; - static int fmt_offset; - - ulong fmt_addr; - - if (!inited) { - inited = 1; - fmt_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "print_fmt"), - MEMBER_OFFSET("trace_event_call", "print_fmt")); - } - - if (fmt_offset < 0) { - *print_fmt = strdup("Unknown print_fmt"); - return 0; - } - - if (!readmem(call + fmt_offset, KVADDR, &fmt_addr, sizeof(fmt_addr), - "read ftrace_event_call fmt_addr", RETURN_ON_ERROR)) - return -1; - - return read_long_string(fmt_addr, print_fmt); -} - -static -int ftrace_get_event_type_id(ulong call, int *id) -{ - static int inited; - static int id_offset; - - if (!inited) { - inited = 1; - id_offset = MAX(MEMBER_OFFSET("ftrace_event_call", "id"), - MEMBER_OFFSET("trace_event_call", "id")); - - if (id_offset < 0) { - /* id = call->event.type */ - int f1 = MAX(MEMBER_OFFSET("ftrace_event_call", "event"), - MEMBER_OFFSET("trace_event_call", "event")); - int f2 = MEMBER_OFFSET("trace_event", "type"); - - if (f1 >= 0 && f2 >= 0) - id_offset = f1 + f2; - } - } - - if (id_offset < 0) - return -1; - - if (!readmem(call + id_offset, KVADDR, id, sizeof(*id), - "read ftrace_event_call id", RETURN_ON_ERROR)) - return -1; - - return 0; -} - -static int ftrace_init_event_types(void) -{ - ulong event; - struct event_type *aevent_type; - int max_types = 128; - - event_types = malloc(sizeof(*event_types) * max_types); - if (event_types == NULL) - return -1; - - read_value(event, ftrace_events, list_head, next); - while (event != ftrace_events) { - ulong call; - char name[128], system[128], *print_fmt; - int id; - - call = event - koffset(ftrace_event_call, list); - - /* Read a event type from the core */ - if (ftrace_get_event_type_id(call, &id) < 0 || - ftrace_get_event_type_name(call, name, 128) < 0 || - ftrace_get_event_type_system(call, system, 128) < 0 || - ftrace_get_event_type_print_fmt(call, &print_fmt) < 0) - goto out_fail; - - /* Enlarge event types array when need */ - if (nr_event_types >= max_types) { - void *tmp; - - max_types = 2 * nr_event_types; - tmp = realloc(event_types, - sizeof(*event_types) * max_types); - if (tmp == NULL) { - free(print_fmt); - goto out_fail; - } - - event_types = tmp; - } - - /* Create a event type */ - aevent_type = malloc(sizeof(*aevent_type)); - if (aevent_type == NULL) { - free(print_fmt); - goto out_fail; - } - - aevent_type->system = strdup(system); - aevent_type->name = strdup(name); - aevent_type->print_fmt = print_fmt; - aevent_type->id = id; - aevent_type->nfields = 0; - aevent_type->fields = NULL; - - if (aevent_type->system == NULL || aevent_type->name == NULL) - goto out_fail_free_aevent_type; - - if (ftrace_init_event_type(call, aevent_type) < 0) - goto out_fail_free_aevent_type; - - if (!strcmp("ftrace", aevent_type->system)) - aevent_type->plugin = 1; - else - aevent_type->plugin = 0; - - /* Add a event type */ - event_types[nr_event_types++] = aevent_type; - if ((unsigned)id < MAX_CACHE_ID) - event_type_cache[id] = aevent_type; - - /* Advance to the next event type */ - read_value(event, event, list_head, next); - } - - if (ftrace_init_common_fields() < 0) - goto out_fail; - - return 0; - -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(); - return -1; -} - -#define default_common_field_count 5 - -static int ftrace_dump_event_type(struct event_type *t, const char *path) -{ - char format_path[PATH_MAX]; - FILE *out; - int i, nfields; - struct ftrace_field *fields; - int printed_common_field = 0; - - snprintf(format_path, sizeof(format_path), "%s/format", path); - out = fopen(format_path, "w"); - if (out == NULL) - return -1; - - fprintf(out, "name: %s\n", t->name); - fprintf(out, "ID: %d\n", t->id); - fprintf(out, "format:\n"); - - if (ftrace_common_fields_count) { - nfields = ftrace_common_fields_count; - fields = ftrace_common_fields; - } else { - nfields = default_common_field_count; - fields = &t->fields[t->nfields - nfields]; - } - -again: - for (i = 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 = &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); - } - } - - if (!printed_common_field) { - fprintf(out, "\n"); - - if (ftrace_common_fields_count) - nfields = t->nfields; - else - nfields = t->nfields - default_common_field_count; - fields = t->fields; - - printed_common_field = 1; - goto again; - } - - fprintf(out, "\nprint fmt: %s\n", t->print_fmt); - - fclose(out); - - return 0; -} - -static int ftrace_dump_event_types(const char *events_path) -{ - int i; - - for (i = 0; i < nr_event_types; i++) { - char path[PATH_MAX]; - struct event_type *t = event_types[i]; - - snprintf(path, sizeof(path), "%s/%s", events_path, t->system); - if (try_mkdir(path, 0755) < 0) - return -1; - - snprintf(path, sizeof(path), "%s/%s/%s", events_path, - t->system, t->name); - if (try_mkdir(path, 0755) < 0) - return -1; - - if (ftrace_dump_event_type(t, path) < 0) - return -1; - } - - return 0; -} - -static void show_basic_info(void) -{ - fprintf(fp, "current tracer is %s\n", current_tracer_name); -} - -static int dump_saved_cmdlines(const char *dump_tracing_dir) -{ - char path[PATH_MAX]; - FILE *out; - int i; - struct task_context *tc; - - snprintf(path, sizeof(path), "%s/saved_cmdlines", dump_tracing_dir); - out = fopen(path, "w"); - if (out == NULL) - return -1; - - tc = FIRST_CONTEXT(); - for (i = 0; i < RUNNING_TASKS(); i++) - fprintf(out, "%d %s\n", (int)tc[i].pid, tc[i].comm); - - fclose(out); - 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); - -#define FTRACE_DUMP_SYMBOLS (1 << 0) -#define FTRACE_DUMP_META_DATA (1 << 1) - -static int populate_ftrace_dir_tree(struct trace_instance *ti, - char *root, uint flags) -{ - char path[PATH_MAX]; - int ret; - - ret = mkdir(root, 0755); - if (ret < 0) { - if (errno == EEXIST) - error(INFO, "mkdir: %s exists\n", root); - return FALSE; - } - - snprintf(path, sizeof(path), "%s/per_cpu", root); - if (try_mkdir(path, 0755) < 0) - return FALSE; - - if (ftrace_dump_buffers(path, ti) < 0) - return FALSE; - - if (flags & FTRACE_DUMP_META_DATA) { - /* Dump event types */ - snprintf(path, sizeof(path), "%s/events", root); - if (try_mkdir(path, 0755) < 0) - return FALSE; - - if (ftrace_dump_event_types(path) < 0) - return FALSE; - - /* Dump pids with corresponding cmdlines */ - if (dump_saved_cmdlines(root) < 0) - return FALSE; - } - - if (flags & FTRACE_DUMP_SYMBOLS) { - /* Dump all symbols of the kernel */ - dump_kallsyms(root); - } - - return TRUE; -} - -static void ftrace_dump(int argc, char *argv[]) -{ - int c; - int i; - uint flags = 0; - char *dump_tracing_dir; - char instance_path[PATH_MAX]; - - while ((c = getopt(argc, argv, "smt")) != EOF) { - switch(c) - { - case 's': - flags |= FTRACE_DUMP_SYMBOLS; - break; - case 'm': - flags |= FTRACE_DUMP_META_DATA; - break; - case 't': - if (flags & FTRACE_DUMP_SYMBOLS || - flags & FTRACE_DUMP_META_DATA || - argc - optind > 1) - cmd_usage(pc->curcmd, SYNOPSIS); - else { - char *trace_dat = "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; - } - } - - if (argc - optind == 0) { - dump_tracing_dir = "dump_tracing_dir"; - } else if (argc - optind == 1) { - dump_tracing_dir = argv[optind]; - } else { - cmd_usage(pc->curcmd, SYNOPSIS); - return; - } - - if (!populate_ftrace_dir_tree(&global_trace_instance, dump_tracing_dir, flags)) - return; - - if (!multiple_instances_available || instance_count == 0) - return; - - /* Create an instances directory, and dump instance data in there */ - snprintf(instance_path, sizeof(instance_path), - "%s/instances", dump_tracing_dir); - if (try_mkdir(instance_path, 0755) < 0) - return; - - /* Don't care about the flags anymore */ - flags = 0; - - for (i = 0; i < instance_count; i++) - { - struct trace_instance *ti = &trace_instances[i]; - - snprintf(instance_path, sizeof(instance_path), - "%s/instances/%s", dump_tracing_dir, - ti->name); - - if (populate_ftrace_dir_tree(ti, instance_path, flags) < 0) - break; - } - - return; -} - -static void ftrace_show(int argc, char *argv[]) -{ - char buf[4096]; - char tmp[] = "/tmp/crash.trace_dat.XXXXXX"; - char *trace_cmd = "trace-cmd", *env_trace_cmd = getenv("TRACE_CMD"); - int fd; - FILE *file; - size_t ret; - size_t nitems __attribute__ ((__unused__)); - - /* check trace-cmd */ - if (env_trace_cmd) - trace_cmd = env_trace_cmd; - buf[0] = 0; - if ((file = popen(trace_cmd, "r"))) { - ret = fread(buf, 1, sizeof(buf), file); - buf[ret] = 0; - pclose(file); - } - if (!strstr(buf, "trace-cmd version")) { - if (env_trace_cmd) - fprintf(fp, "Invalid environment TRACE_CMD: %s\n", - env_trace_cmd); - else - fprintf(fp, "\"trace show\" requires trace-cmd.\n" - "please set the environment TRACE_CMD " - "if you installed it in a special path\n" - ); - return; - } - - /* dump trace.dat to the temp file */ - fd = mkstemp(tmp); - if (fd < 0) - return; - if (trace_cmd_data_output(fd) < 0) - goto out; - - /* splice the output of trace-cmd to user */ - snprintf(buf, sizeof(buf), "%s report %s", trace_cmd, tmp); - if (!(file = popen(buf, "r"))) - goto out; - for (;;) { - ret = fread(buf, 1, sizeof(buf), file); - if (ret == 0) - break; - nitems = fwrite(buf, 1, ret, fp); - } - pclose(file); -out: - close(fd); - unlink(tmp); - return; -} - -static void cmd_ftrace(void) -{ - if (argcnt == 1) - show_basic_info(); - else if (!strcmp(args[1], "dump")) - ftrace_dump(argcnt - 1, args + 1); - else if (!strcmp(args[1], "show")) - ftrace_show(argcnt - 1, args + 1); - else if (!strcmp(args[1], "report")) - ftrace_show(argcnt - 1, args + 1); - else - cmd_usage(pc->curcmd, SYNOPSIS); -} - -static char *help_ftrace[] = { -"trace", -"show or dump the tracing info", -"[ <show [-c <cpulist>] [-f [no]<flagname>]> | <dump [-sm] <dest-dir>> ] | <dump -t <trace.dat> ]", -"trace", -" shows the current tracer and other informations.", -"", -"trace show", -" shows all events with readability text(sorted by timestamp)", -"", -"trace report", -" the same as \"trace show\"", -"", -"trace dump [-sm] <dest-dir>", -" dump ring_buffers to dest-dir. Then you can parse it", -" by other tracing tools. The dirs and files are generated", -" the same as debugfs/tracing.", -" -m: also dump metadata of ftrace.", -" -s: also dump symbols of the kernel.", -"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 -}; - -static struct command_table_entry command_table[] = { - { "trace", cmd_ftrace, help_ftrace, 0 }, - { NULL, 0, 0, 0 } -}; - -static int ftrace_initialized; - -void __attribute__((constructor)) -trace_init(void) -{ - if (ftrace_init() < 0) - return; - - ftrace_initialized = 1; - register_extension(command_table); -} - -void __attribute__((destructor)) -trace_fini(void) -{ - if (ftrace_initialized) - ftrace_destroy(); -} - -#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, nfields; - struct ftrace_field *fields; - int printed_common_field = 0; - - tmp_fprintf("name: %s\n", t->name); - tmp_fprintf("ID: %d\n", t->id); - tmp_fprintf("format:\n"); - - if (ftrace_common_fields_count) { - nfields = ftrace_common_fields_count; - fields = ftrace_common_fields; - } else { - nfields = default_common_field_count; - fields = &t->fields[t->nfields - nfields]; - } - -again: - for (i = 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 = &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 (!printed_common_field) { - tmp_fprintf("\n"); - - if (ftrace_common_fields_count) - nfields = t->nfields; - else - nfields = t->nfields - default_common_field_count; - fields = t->fields; - - printed_common_field = 1; - goto again; - } - - 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; - - /* Currently sp->type for modules is not trusted */ - tmp_fprintf("%lx %c %s\t[%s]\n", sp->value, 'm', - sp->name, lm->mod_name); - } - } - - if (tmp_file_record_size4(fd)) - return -1; - return tmp_file_flush(fd); -} - -static int add_print_address(long address) -{ - char string[4096]; - size_t len; - int i; - - len = read_string(address, string, sizeof(string)); - if (!len) - return -1; - - tmp_fprintf("0x%lx : \"", address); - - 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"); - - return 0; -} - -static int save_ftrace_printk(int fd) -{ - struct kernel_list_head *mod_fmt; - struct syment *s, *e, *b; - long bprintk_fmt_s, bprintk_fmt_e; - long *address; - size_t i, count; - int addr_is_array = 0; - - 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) - goto do_mods; - - 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++) { - if (add_print_address(address[i]) < 0) { - free(address); - return -1; - } - } - - free(address); - - do_mods: - - /* Add modules */ - b = symbol_search("trace_bprintk_fmt_list"); - if (!b) - goto out; - - switch (MEMBER_TYPE("trace_bprintk_fmt", "fmt")) { - case TYPE_CODE_ARRAY: - addr_is_array = 1; - break; - case TYPE_CODE_PTR: - default: - /* default not array */ - break; - } - - mod_fmt = (struct kernel_list_head *)GETBUF(SIZE(list_head)); - if (!readmem(b->value, KVADDR, mod_fmt, - SIZE(list_head), "trace_bprintk_fmt_list contents", - RETURN_ON_ERROR)) - goto out_free; - - while ((unsigned long)mod_fmt->next != b->value) { - unsigned long addr; - - addr = (unsigned long)mod_fmt->next + SIZE(list_head); - if (!addr_is_array) { - if (!readmem(addr, KVADDR, &addr, sizeof(addr), - "trace_bprintk_fmt_list fmt field", - RETURN_ON_ERROR)) - goto out_free; - } - - if (!readmem((unsigned long)mod_fmt->next, KVADDR, mod_fmt, - SIZE(list_head), "trace_bprintk_fmt_list contents", - RETURN_ON_ERROR)) - goto out_free; - - if (add_print_address(addr) < 0) - goto out_free; - count++; - } - - out_free: - FREEBUF(mod_fmt); - out: - if (count == 0) { - unsigned int size = 0; - return write_and_check(fd, &size, 4); - } - 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); -} - -/* From trace-cmd.h */ -enum { - TRACECMD_OPTION_DONE, /* 0 */ - TRACECMD_OPTION_DATE, /* 1 */ - TRACECMD_OPTION_CPUSTAT, /* 2 */ - TRACECMD_OPTION_BUFFER, /* 3 */ - TRACECMD_OPTION_TRACECLOCK, /* 4 */ - TRACECMD_OPTION_UNAME, /* 5 */ - TRACECMD_OPTION_HOOK, /* 6 */ -}; - -static int write_options(int fd, unsigned long long *buffer_offsets) -{ - int i; - unsigned short option; - - if (!multiple_instances_available) - return 0; - - if (write_and_check(fd, "options ", 10)) - return -1; - - option = TRACECMD_OPTION_BUFFER; - for (i = 0; i < instance_count; i++) - { - char *name = trace_instances[i].name; - size_t name_size = strlen(name) + 1; /* Name length + '\0' */ - unsigned long long option_size = 8 + name_size; - unsigned long long offset; - - offset = buffer_offsets ? buffer_offsets[i] : 0; - if (write_and_check(fd, &option, 2)) - return -1; - if (write_and_check(fd, &option_size, 4)) - return -1; - if (write_and_check(fd, &offset, 8)) - return -1; - if (write_and_check(fd, name, name_size)) - return -1; - } - - option = TRACECMD_OPTION_DONE; - if (write_and_check(fd, &option, 2)) - return -1; - - return 0; -} - -static int save_res_data(int fd, int nr_cpu_buffers, unsigned long long *buffer_offsets) -{ - if (write_and_check(fd, &nr_cpu_buffers, 4)) - return -1; - - if (write_options(fd, buffer_offsets)) - return -1; - - if (write_and_check(fd, "flyrecord", 10)) - return -1; - - return 0; -} - -static int save_record_data(int fd, int nr_cpu_buffers, struct trace_instance *ti) -{ - 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 = &ti->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 = &ti->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[j], - page_tmp) < 0) { - free(page_tmp); - return -1; - } - } - } - - free(page_tmp); - - return 0; -} - -static int get_nr_cpu_buffers(struct trace_instance *ti) -{ - int i; - int nr_cpu_buffers = 0; - - for (i = 0; i < nr_cpu_ids; i++) { - struct ring_buffer_per_cpu *cpu_buffer = &ti->buffers[i]; - - if (!cpu_buffer->kaddr) - continue; - - nr_cpu_buffers++; - } - - return nr_cpu_buffers; -} - -static int __trace_cmd_data_output(int fd) -{ - int nr_cpu_buffers; - unsigned long long global_res_data_offset; - unsigned long long *instance_offsets; - - instance_offsets = calloc(sizeof(unsigned long long), instance_count); - - nr_cpu_buffers = get_nr_cpu_buffers(&global_trace_instance); - - 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; - - /* We don't have the instance buffer offsets yet, so we'll write in 0s - * for now, and fix it up after we have that information available */ - global_res_data_offset = lseek(fd, 0, SEEK_CUR); - if (save_res_data(fd, nr_cpu_buffers, NULL)) - return -1; - if (save_record_data(fd, nr_cpu_buffers, &global_trace_instance)) - return -1; - - if (multiple_instances_available) - { - int i; - - for (i = 0; i < instance_count; i++) - { - struct trace_instance *ti = &trace_instances[i]; - nr_cpu_buffers = get_nr_cpu_buffers(ti); - - /* Save off the instance offset for fixup later */ - instance_offsets[i] = lseek(fd, 0, SEEK_CUR); - - if (write_and_check(fd, "flyrecord", 10)) - return -1; - if (save_record_data(fd, nr_cpu_buffers, ti)) - return -1; - } - } - - /* Fix up the global trace's options header with the instance offsets */ - lseek(fd, global_res_data_offset, SEEK_SET); - nr_cpu_buffers = get_nr_cpu_buffers(&global_trace_instance); - if (save_res_data(fd, nr_cpu_buffers, instance_offsets)) - 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; -} diff --git a/extensions/trace.c.README b/extensions/trace.c.README new file mode 100644 index 000000000000..de1d43ce88a2 --- /dev/null +++ b/extensions/trace.c.README @@ -0,0 +1,7 @@ + +The trace.c extension module moved to the separate repository: + https://github.com/fujitsu/crash-trace + +See also: + https://crash-utility.github.io/extensions.html#TRACE + -- 2.18.4 -- Crash-utility mailing list [email protected] https://listman.redhat.com/mailman/listinfo/crash-utility
