539 lines
8.8 KiB
C
539 lines
8.8 KiB
C
#include "../perf.h"
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#include "util.h"
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#include "debug.h"
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#include <api/fs/fs.h>
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#include <sys/mman.h>
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#ifdef HAVE_BACKTRACE_SUPPORT
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#include <execinfo.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <byteswap.h>
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#include <linux/kernel.h>
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/*
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* XXX We need to find a better place for these things...
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*/
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unsigned int page_size;
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int cacheline_size;
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bool test_attr__enabled;
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bool perf_host = true;
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bool perf_guest = false;
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char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
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void event_attr_init(struct perf_event_attr *attr)
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{
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if (!perf_host)
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attr->exclude_host = 1;
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if (!perf_guest)
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attr->exclude_guest = 1;
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/* to capture ABI version */
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attr->size = sizeof(*attr);
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}
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int mkdir_p(char *path, mode_t mode)
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{
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struct stat st;
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int err;
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char *d = path;
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if (*d != '/')
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return -1;
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if (stat(path, &st) == 0)
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return 0;
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while (*++d == '/');
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while ((d = strchr(d, '/'))) {
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*d = '\0';
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err = stat(path, &st) && mkdir(path, mode);
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*d++ = '/';
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if (err)
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return -1;
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while (*d == '/')
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++d;
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}
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return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
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}
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static int slow_copyfile(const char *from, const char *to, mode_t mode)
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{
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int err = -1;
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char *line = NULL;
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size_t n;
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FILE *from_fp = fopen(from, "r"), *to_fp;
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mode_t old_umask;
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if (from_fp == NULL)
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goto out;
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old_umask = umask(mode ^ 0777);
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to_fp = fopen(to, "w");
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umask(old_umask);
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if (to_fp == NULL)
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goto out_fclose_from;
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while (getline(&line, &n, from_fp) > 0)
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if (fputs(line, to_fp) == EOF)
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goto out_fclose_to;
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err = 0;
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out_fclose_to:
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fclose(to_fp);
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free(line);
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out_fclose_from:
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fclose(from_fp);
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out:
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return err;
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}
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int copyfile_mode(const char *from, const char *to, mode_t mode)
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{
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int fromfd, tofd;
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struct stat st;
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void *addr;
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int err = -1;
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if (stat(from, &st))
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goto out;
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if (st.st_size == 0) /* /proc? do it slowly... */
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return slow_copyfile(from, to, mode);
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fromfd = open(from, O_RDONLY);
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if (fromfd < 0)
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goto out;
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tofd = creat(to, mode);
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if (tofd < 0)
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goto out_close_from;
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addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
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if (addr == MAP_FAILED)
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goto out_close_to;
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if (write(tofd, addr, st.st_size) == st.st_size)
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err = 0;
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munmap(addr, st.st_size);
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out_close_to:
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close(tofd);
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if (err)
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unlink(to);
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out_close_from:
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close(fromfd);
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out:
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return err;
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}
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int copyfile(const char *from, const char *to)
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{
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return copyfile_mode(from, to, 0755);
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}
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unsigned long convert_unit(unsigned long value, char *unit)
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{
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*unit = ' ';
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if (value > 1000) {
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value /= 1000;
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*unit = 'K';
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}
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if (value > 1000) {
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value /= 1000;
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*unit = 'M';
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}
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if (value > 1000) {
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value /= 1000;
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*unit = 'G';
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}
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return value;
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}
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static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
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{
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void *buf_start = buf;
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size_t left = n;
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while (left) {
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ssize_t ret = is_read ? read(fd, buf, left) :
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write(fd, buf, left);
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if (ret < 0 && errno == EINTR)
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continue;
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if (ret <= 0)
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return ret;
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left -= ret;
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buf += ret;
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}
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BUG_ON((size_t)(buf - buf_start) != n);
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return n;
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}
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/*
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* Read exactly 'n' bytes or return an error.
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*/
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ssize_t readn(int fd, void *buf, size_t n)
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{
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return ion(true, fd, buf, n);
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}
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/*
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* Write exactly 'n' bytes or return an error.
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*/
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ssize_t writen(int fd, void *buf, size_t n)
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{
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return ion(false, fd, buf, n);
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}
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size_t hex_width(u64 v)
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{
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size_t n = 1;
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while ((v >>= 4))
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++n;
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return n;
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}
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static int hex(char ch)
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{
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if ((ch >= '0') && (ch <= '9'))
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return ch - '0';
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if ((ch >= 'a') && (ch <= 'f'))
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return ch - 'a' + 10;
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if ((ch >= 'A') && (ch <= 'F'))
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return ch - 'A' + 10;
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return -1;
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}
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/*
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* While we find nice hex chars, build a long_val.
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* Return number of chars processed.
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*/
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int hex2u64(const char *ptr, u64 *long_val)
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{
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const char *p = ptr;
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*long_val = 0;
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while (*p) {
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const int hex_val = hex(*p);
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if (hex_val < 0)
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break;
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*long_val = (*long_val << 4) | hex_val;
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p++;
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}
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return p - ptr;
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}
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/* Obtain a backtrace and print it to stdout. */
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#ifdef HAVE_BACKTRACE_SUPPORT
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void dump_stack(void)
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{
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void *array[16];
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size_t size = backtrace(array, ARRAY_SIZE(array));
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char **strings = backtrace_symbols(array, size);
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size_t i;
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printf("Obtained %zd stack frames.\n", size);
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for (i = 0; i < size; i++)
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printf("%s\n", strings[i]);
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free(strings);
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}
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#else
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void dump_stack(void) {}
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#endif
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void get_term_dimensions(struct winsize *ws)
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{
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char *s = getenv("LINES");
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if (s != NULL) {
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ws->ws_row = atoi(s);
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s = getenv("COLUMNS");
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if (s != NULL) {
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ws->ws_col = atoi(s);
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if (ws->ws_row && ws->ws_col)
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return;
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}
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}
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#ifdef TIOCGWINSZ
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if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
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ws->ws_row && ws->ws_col)
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return;
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#endif
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ws->ws_row = 25;
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ws->ws_col = 80;
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}
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static void set_tracing_events_path(const char *mountpoint)
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{
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snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s",
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mountpoint, "tracing/events");
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}
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const char *perf_debugfs_mount(const char *mountpoint)
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{
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const char *mnt;
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mnt = debugfs_mount(mountpoint);
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if (!mnt)
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return NULL;
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set_tracing_events_path(mnt);
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return mnt;
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}
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void perf_debugfs_set_path(const char *mntpt)
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{
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snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
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set_tracing_events_path(mntpt);
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}
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static const char *find_debugfs(void)
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{
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const char *path = perf_debugfs_mount(NULL);
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if (!path)
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fprintf(stderr, "Your kernel does not support the debugfs filesystem");
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return path;
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}
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/*
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* Finds the path to the debugfs/tracing
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* Allocates the string and stores it.
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*/
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const char *find_tracing_dir(void)
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{
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static char *tracing;
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static int tracing_found;
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const char *debugfs;
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if (tracing_found)
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return tracing;
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debugfs = find_debugfs();
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if (!debugfs)
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return NULL;
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if (asprintf(&tracing, "%s/tracing", debugfs) < 0)
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return NULL;
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tracing_found = 1;
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return tracing;
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}
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char *get_tracing_file(const char *name)
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{
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const char *tracing;
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char *file;
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tracing = find_tracing_dir();
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if (!tracing)
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return NULL;
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if (asprintf(&file, "%s/%s", tracing, name) < 0)
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return NULL;
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return file;
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}
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void put_tracing_file(char *file)
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{
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free(file);
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}
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int parse_nsec_time(const char *str, u64 *ptime)
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{
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u64 time_sec, time_nsec;
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char *end;
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time_sec = strtoul(str, &end, 10);
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if (*end != '.' && *end != '\0')
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return -1;
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if (*end == '.') {
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int i;
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char nsec_buf[10];
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if (strlen(++end) > 9)
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return -1;
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strncpy(nsec_buf, end, 9);
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nsec_buf[9] = '\0';
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/* make it nsec precision */
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for (i = strlen(nsec_buf); i < 9; i++)
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nsec_buf[i] = '0';
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time_nsec = strtoul(nsec_buf, &end, 10);
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if (*end != '\0')
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return -1;
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} else
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time_nsec = 0;
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*ptime = time_sec * NSEC_PER_SEC + time_nsec;
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return 0;
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}
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unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
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{
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struct parse_tag *i = tags;
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while (i->tag) {
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char *s;
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s = strchr(str, i->tag);
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if (s) {
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unsigned long int value;
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char *endptr;
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value = strtoul(str, &endptr, 10);
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if (s != endptr)
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break;
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if (value > ULONG_MAX / i->mult)
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break;
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value *= i->mult;
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return value;
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}
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i++;
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}
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return (unsigned long) -1;
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}
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int filename__read_int(const char *filename, int *value)
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{
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char line[64];
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int fd = open(filename, O_RDONLY), err = -1;
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if (fd < 0)
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return -1;
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if (read(fd, line, sizeof(line)) > 0) {
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*value = atoi(line);
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err = 0;
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}
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close(fd);
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return err;
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}
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int filename__read_str(const char *filename, char **buf, size_t *sizep)
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{
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size_t size = 0, alloc_size = 0;
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void *bf = NULL, *nbf;
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int fd, n, err = 0;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return -errno;
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do {
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if (size == alloc_size) {
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alloc_size += BUFSIZ;
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nbf = realloc(bf, alloc_size);
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if (!nbf) {
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err = -ENOMEM;
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break;
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}
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bf = nbf;
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}
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n = read(fd, bf + size, alloc_size - size);
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if (n < 0) {
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if (size) {
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pr_warning("read failed %d: %s\n",
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errno, strerror(errno));
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err = 0;
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} else
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err = -errno;
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break;
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}
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size += n;
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} while (n > 0);
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if (!err) {
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*sizep = size;
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*buf = bf;
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} else
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free(bf);
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close(fd);
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return err;
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}
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const char *get_filename_for_perf_kvm(void)
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{
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const char *filename;
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if (perf_host && !perf_guest)
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filename = strdup("perf.data.host");
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else if (!perf_host && perf_guest)
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filename = strdup("perf.data.guest");
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else
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filename = strdup("perf.data.kvm");
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return filename;
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}
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int perf_event_paranoid(void)
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{
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char path[PATH_MAX];
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const char *procfs = procfs__mountpoint();
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int value;
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if (!procfs)
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return INT_MAX;
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scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs);
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if (filename__read_int(path, &value))
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return INT_MAX;
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return value;
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}
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void mem_bswap_32(void *src, int byte_size)
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{
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u32 *m = src;
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while (byte_size > 0) {
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*m = bswap_32(*m);
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byte_size -= sizeof(u32);
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++m;
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}
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}
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void mem_bswap_64(void *src, int byte_size)
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{
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u64 *m = src;
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while (byte_size > 0) {
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*m = bswap_64(*m);
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byte_size -= sizeof(u64);
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++m;
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}
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}
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