ae39ba1655
Build ID injection wasn't inserting a sample ID and aligning events to 64 bytes rather than 8. No sample ID means events are unordered and two different build_id events for the same path, as happens when a file is replaced, can't be differentiated. Add in sample ID insertion for the build_id events alongside some refactoring. The refactoring better aligns the function arguments for different use cases, such as synthesizing build_id events without needing to have a dso. The misc bits are explicitly passed as with callchains the maps/dsos may span user and kernel land, so using sample->cpumode isn't good enough. Signed-off-by: Ian Rogers <irogers@google.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Anne Macedo <retpolanne@posteo.net> Cc: Casey Chen <cachen@purestorage.com> Cc: Colin Ian King <colin.i.king@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sun Haiyong <sunhaiyong@loongson.cn> Link: https://lore.kernel.org/r/20240909203740.143492-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
963 lines
22 KiB
C
963 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* build-id.c
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*
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* build-id support
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*
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* Copyright (C) 2009, 2010 Red Hat Inc.
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* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "util.h" // lsdir(), mkdir_p(), rm_rf()
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#include <dirent.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "util/copyfile.h"
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#include "dso.h"
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#include "build-id.h"
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#include "event.h"
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#include "namespaces.h"
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#include "map.h"
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#include "symbol.h"
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#include "thread.h"
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#include <linux/kernel.h>
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#include "debug.h"
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#include "session.h"
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#include "tool.h"
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#include "header.h"
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#include "vdso.h"
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#include "path.h"
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#include "probe-file.h"
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#include "strlist.h"
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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#include <elfutils/debuginfod.h>
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#endif
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#include <linux/ctype.h>
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#include <linux/zalloc.h>
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#include <linux/string.h>
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#include <asm/bug.h>
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static bool no_buildid_cache;
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int build_id__mark_dso_hit(const struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample,
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struct evsel *evsel __maybe_unused,
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struct machine *machine)
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{
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struct addr_location al;
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struct thread *thread = machine__findnew_thread(machine, sample->pid,
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sample->tid);
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if (thread == NULL) {
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pr_err("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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addr_location__init(&al);
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if (thread__find_map(thread, sample->cpumode, sample->ip, &al))
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dso__set_hit(map__dso(al.map));
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addr_location__exit(&al);
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thread__put(thread);
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return 0;
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}
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int build_id__sprintf(const struct build_id *build_id, char *bf)
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{
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char *bid = bf;
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const u8 *raw = build_id->data;
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size_t i;
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bf[0] = 0x0;
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for (i = 0; i < build_id->size; ++i) {
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sprintf(bid, "%02x", *raw);
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++raw;
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bid += 2;
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}
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return (bid - bf) + 1;
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}
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int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
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{
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char notes[PATH_MAX];
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struct build_id bid;
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int ret;
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if (!root_dir)
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root_dir = "";
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scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
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ret = sysfs__read_build_id(notes, &bid);
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if (ret < 0)
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return ret;
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return build_id__sprintf(&bid, sbuild_id);
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}
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int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
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{
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struct build_id bid;
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int ret;
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ret = filename__read_build_id(pathname, &bid);
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if (ret < 0)
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return ret;
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return build_id__sprintf(&bid, sbuild_id);
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}
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/* asnprintf consolidates asprintf and snprintf */
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static int asnprintf(char **strp, size_t size, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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if (!strp)
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return -EINVAL;
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va_start(ap, fmt);
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if (*strp)
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ret = vsnprintf(*strp, size, fmt, ap);
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else
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ret = vasprintf(strp, fmt, ap);
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va_end(ap);
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return ret;
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}
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char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
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size_t size)
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{
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bool retry_old = true;
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snprintf(bf, size, "%s/%s/%s/kallsyms",
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
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retry:
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if (!access(bf, F_OK))
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return bf;
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if (retry_old) {
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/* Try old style kallsyms cache */
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snprintf(bf, size, "%s/%s/%s",
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
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retry_old = false;
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goto retry;
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}
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return NULL;
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}
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char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
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{
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char *tmp = bf;
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int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
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sbuild_id, sbuild_id + 2);
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if (ret < 0 || (tmp && size < (unsigned int)ret))
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return NULL;
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return bf;
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}
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/* The caller is responsible to free the returned buffer. */
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char *build_id_cache__origname(const char *sbuild_id)
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{
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char *linkname;
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char buf[PATH_MAX];
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char *ret = NULL, *p;
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size_t offs = 5; /* == strlen("../..") */
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ssize_t len;
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
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if (!linkname)
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return NULL;
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len = readlink(linkname, buf, sizeof(buf) - 1);
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if (len <= 0)
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goto out;
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buf[len] = '\0';
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/* The link should be "../..<origpath>/<sbuild_id>" */
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p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
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if (p && (p > buf + offs)) {
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*p = '\0';
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if (buf[offs + 1] == '[')
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offs++; /*
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* This is a DSO name, like [kernel.kallsyms].
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* Skip the first '/', since this is not the
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* cache of a regular file.
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*/
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ret = strdup(buf + offs); /* Skip "../..[/]" */
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}
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out:
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free(linkname);
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return ret;
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}
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/* Check if the given build_id cache is valid on current running system */
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static bool build_id_cache__valid_id(char *sbuild_id)
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{
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char real_sbuild_id[SBUILD_ID_SIZE] = "";
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char *pathname;
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int ret = 0;
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bool result = false;
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pathname = build_id_cache__origname(sbuild_id);
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if (!pathname)
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return false;
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if (!strcmp(pathname, DSO__NAME_KALLSYMS))
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ret = sysfs__sprintf_build_id("/", real_sbuild_id);
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else if (pathname[0] == '/')
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ret = filename__sprintf_build_id(pathname, real_sbuild_id);
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else
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ret = -EINVAL; /* Should we support other special DSO cache? */
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if (ret >= 0)
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result = (strcmp(sbuild_id, real_sbuild_id) == 0);
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free(pathname);
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return result;
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}
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static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso,
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bool is_debug)
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{
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return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ?
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"debug" : "elf"));
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}
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char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
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bool is_debug, bool is_kallsyms)
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{
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bool is_vdso = dso__is_vdso((struct dso *)dso);
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char sbuild_id[SBUILD_ID_SIZE];
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char *linkname;
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bool alloc = (bf == NULL);
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int ret;
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if (!dso__has_build_id(dso))
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return NULL;
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build_id__sprintf(dso__bid_const(dso), sbuild_id);
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
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if (!linkname)
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return NULL;
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/* Check if old style build_id cache */
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if (is_regular_file(linkname))
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ret = asnprintf(&bf, size, "%s", linkname);
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else
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ret = asnprintf(&bf, size, "%s/%s", linkname,
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build_id_cache__basename(is_kallsyms, is_vdso,
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is_debug));
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if (ret < 0 || (!alloc && size < (unsigned int)ret))
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bf = NULL;
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free(linkname);
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return bf;
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}
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char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
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bool is_debug)
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{
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bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
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return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms);
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}
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static int write_buildid(const char *name, size_t name_len, struct build_id *bid,
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pid_t pid, u16 misc, struct feat_fd *fd)
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{
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int err;
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struct perf_record_header_build_id b;
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size_t len;
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len = sizeof(b) + name_len + 1;
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len = PERF_ALIGN(len, sizeof(u64));
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memset(&b, 0, sizeof(b));
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memcpy(&b.data, bid->data, bid->size);
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b.size = (u8) bid->size;
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misc |= PERF_RECORD_MISC_BUILD_ID_SIZE;
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b.pid = pid;
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b.header.misc = misc;
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b.header.size = len;
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err = do_write(fd, &b, sizeof(b));
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if (err < 0)
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return err;
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return write_padded(fd, name, name_len + 1, len);
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}
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struct machine__write_buildid_table_cb_args {
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struct machine *machine;
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struct feat_fd *fd;
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u16 kmisc, umisc;
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};
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static int machine__write_buildid_table_cb(struct dso *dso, void *data)
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{
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struct machine__write_buildid_table_cb_args *args = data;
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const char *name;
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size_t name_len;
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bool in_kernel = false;
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if (!dso__has_build_id(dso))
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return 0;
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if (!dso__hit(dso) && !dso__is_vdso(dso))
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return 0;
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if (dso__is_vdso(dso)) {
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name = dso__short_name(dso);
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name_len = dso__short_name_len(dso);
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} else if (dso__is_kcore(dso)) {
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name = args->machine->mmap_name;
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name_len = strlen(name);
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} else {
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name = dso__long_name(dso);
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name_len = dso__long_name_len(dso);
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}
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in_kernel = dso__kernel(dso) || is_kernel_module(name, PERF_RECORD_MISC_CPUMODE_UNKNOWN);
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return write_buildid(name, name_len, dso__bid(dso), args->machine->pid,
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in_kernel ? args->kmisc : args->umisc, args->fd);
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}
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static int machine__write_buildid_table(struct machine *machine, struct feat_fd *fd)
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{
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struct machine__write_buildid_table_cb_args args = {
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.machine = machine,
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.fd = fd,
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.kmisc = PERF_RECORD_MISC_KERNEL,
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.umisc = PERF_RECORD_MISC_USER,
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};
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if (!machine__is_host(machine)) {
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args.kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
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args.umisc = PERF_RECORD_MISC_GUEST_USER;
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}
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return dsos__for_each_dso(&machine->dsos, machine__write_buildid_table_cb, &args);
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}
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int perf_session__write_buildid_table(struct perf_session *session,
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struct feat_fd *fd)
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{
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struct rb_node *nd;
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int err = machine__write_buildid_table(&session->machines.host, fd);
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if (err)
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return err;
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for (nd = rb_first_cached(&session->machines.guests); nd;
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nd = rb_next(nd)) {
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struct machine *pos = rb_entry(nd, struct machine, rb_node);
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err = machine__write_buildid_table(pos, fd);
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if (err)
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break;
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}
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return err;
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}
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void disable_buildid_cache(void)
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{
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no_buildid_cache = true;
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}
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static bool lsdir_bid_head_filter(const char *name __maybe_unused,
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struct dirent *d)
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{
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return (strlen(d->d_name) == 2) &&
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isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
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}
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static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
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struct dirent *d)
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{
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int i = 0;
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while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
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i++;
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return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) &&
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(d->d_name[i] == '\0');
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}
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struct strlist *build_id_cache__list_all(bool validonly)
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{
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struct strlist *toplist, *linklist = NULL, *bidlist;
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struct str_node *nd, *nd2;
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char *topdir, *linkdir = NULL;
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char sbuild_id[SBUILD_ID_SIZE];
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/* for filename__ functions */
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if (validonly)
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symbol__init(NULL);
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/* Open the top-level directory */
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if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
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return NULL;
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bidlist = strlist__new(NULL, NULL);
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if (!bidlist)
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goto out;
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toplist = lsdir(topdir, lsdir_bid_head_filter);
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if (!toplist) {
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pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
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/* If there is no buildid cache, return an empty list */
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if (errno == ENOENT)
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goto out;
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goto err_out;
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}
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strlist__for_each_entry(nd, toplist) {
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if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
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goto err_out;
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/* Open the lower-level directory */
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linklist = lsdir(linkdir, lsdir_bid_tail_filter);
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if (!linklist) {
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pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
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goto err_out;
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}
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strlist__for_each_entry(nd2, linklist) {
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if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
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nd->s, nd2->s) > SBUILD_ID_SIZE - 1)
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goto err_out;
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if (validonly && !build_id_cache__valid_id(sbuild_id))
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continue;
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if (strlist__add(bidlist, sbuild_id) < 0)
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goto err_out;
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}
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strlist__delete(linklist);
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zfree(&linkdir);
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}
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out_free:
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strlist__delete(toplist);
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out:
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free(topdir);
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return bidlist;
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err_out:
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strlist__delete(linklist);
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zfree(&linkdir);
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strlist__delete(bidlist);
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bidlist = NULL;
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goto out_free;
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}
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static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
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{
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size_t i;
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for (i = 0; i < len; i++) {
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if (!isxdigit(maybe_sbuild_id[i]))
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return false;
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}
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return true;
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}
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/* Return the valid complete build-id */
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char *build_id_cache__complement(const char *incomplete_sbuild_id)
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{
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struct strlist *bidlist;
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struct str_node *nd, *cand = NULL;
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char *sbuild_id = NULL;
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size_t len = strlen(incomplete_sbuild_id);
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if (len >= SBUILD_ID_SIZE ||
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!str_is_build_id(incomplete_sbuild_id, len))
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return NULL;
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bidlist = build_id_cache__list_all(true);
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if (!bidlist)
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return NULL;
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strlist__for_each_entry(nd, bidlist) {
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if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
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continue;
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if (cand) { /* Error: There are more than 2 candidates. */
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cand = NULL;
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break;
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}
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cand = nd;
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}
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if (cand)
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sbuild_id = strdup(cand->s);
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strlist__delete(bidlist);
|
|
|
|
return sbuild_id;
|
|
}
|
|
|
|
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms,
|
|
bool is_vdso)
|
|
{
|
|
char *realname = NULL, *filename;
|
|
bool slash = is_kallsyms || is_vdso;
|
|
|
|
if (!slash)
|
|
realname = nsinfo__realpath(name, nsi);
|
|
|
|
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
|
|
is_vdso ? DSO__NAME_VDSO : (realname ? realname : name),
|
|
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
|
|
filename = NULL;
|
|
|
|
free(realname);
|
|
return filename;
|
|
}
|
|
|
|
int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi,
|
|
struct strlist **result)
|
|
{
|
|
char *dir_name;
|
|
int ret = 0;
|
|
|
|
dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false);
|
|
if (!dir_name)
|
|
return -ENOMEM;
|
|
|
|
*result = lsdir(dir_name, lsdir_no_dot_filter);
|
|
if (!*result)
|
|
ret = -errno;
|
|
free(dir_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
|
|
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
|
|
const char *realname,
|
|
struct nsinfo *nsi)
|
|
{
|
|
struct probe_cache *cache;
|
|
int ret;
|
|
struct nscookie nsc;
|
|
|
|
cache = probe_cache__new(sbuild_id, nsi);
|
|
if (!cache)
|
|
return -1;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = probe_cache__scan_sdt(cache, realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
if (ret >= 0) {
|
|
pr_debug4("Found %d SDTs in %s\n", ret, realname);
|
|
if (probe_cache__commit(cache) < 0)
|
|
ret = -1;
|
|
}
|
|
probe_cache__delete(cache);
|
|
return ret;
|
|
}
|
|
#else
|
|
#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0)
|
|
#endif
|
|
|
|
static char *build_id_cache__find_debug(const char *sbuild_id,
|
|
struct nsinfo *nsi,
|
|
const char *root_dir)
|
|
{
|
|
const char *dirname = "/usr/lib/debug/.build-id/";
|
|
char *realname = NULL;
|
|
char dirbuf[PATH_MAX];
|
|
char *debugfile;
|
|
struct nscookie nsc;
|
|
size_t len = 0;
|
|
|
|
debugfile = calloc(1, PATH_MAX);
|
|
if (!debugfile)
|
|
goto out;
|
|
|
|
if (root_dir) {
|
|
path__join(dirbuf, PATH_MAX, root_dir, dirname);
|
|
dirname = dirbuf;
|
|
}
|
|
|
|
len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);
|
|
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
|
|
sbuild_id + 2);
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
realname = realpath(debugfile, NULL);
|
|
if (realname && access(realname, R_OK))
|
|
zfree(&realname);
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT
|
|
if (realname == NULL) {
|
|
debuginfod_client* c;
|
|
|
|
pr_debug("Downloading debug info with build id %s\n", sbuild_id);
|
|
|
|
c = debuginfod_begin();
|
|
if (c != NULL) {
|
|
int fd = debuginfod_find_debuginfo(c,
|
|
(const unsigned char*)sbuild_id, 0,
|
|
&realname);
|
|
if (fd >= 0)
|
|
close(fd); /* retaining reference by realname */
|
|
debuginfod_end(c);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
free(debugfile);
|
|
return realname;
|
|
}
|
|
|
|
int
|
|
build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
|
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name, const char *root_dir)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
|
|
char *debugfile = NULL;
|
|
int err = -1;
|
|
|
|
if (!proper_name)
|
|
proper_name = name;
|
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,
|
|
is_vdso);
|
|
if (!dir_name)
|
|
goto out_free;
|
|
|
|
/* Remove old style build-id cache */
|
|
if (is_regular_file(dir_name))
|
|
if (unlink(dir_name))
|
|
goto out_free;
|
|
|
|
if (mkdir_p(dir_name, 0755))
|
|
goto out_free;
|
|
|
|
/* Save the allocated buildid dirname */
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(is_kallsyms, is_vdso,
|
|
false)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (access(filename, F_OK)) {
|
|
if (is_kallsyms) {
|
|
if (copyfile("/proc/kallsyms", filename))
|
|
goto out_free;
|
|
} else if (nsi && nsinfo__need_setns(nsi)) {
|
|
if (copyfile_ns(name, filename, nsi))
|
|
goto out_free;
|
|
} else if (link(realname, filename) && errno != EEXIST) {
|
|
struct stat f_stat;
|
|
|
|
if (!(stat(name, &f_stat) < 0) &&
|
|
copyfile_mode(name, filename, f_stat.st_mode))
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
/* Some binaries are stripped, but have .debug files with their symbol
|
|
* table. Check to see if we can locate one of those, since the elf
|
|
* file itself may not be very useful to users of our tools without a
|
|
* symtab.
|
|
*/
|
|
if (!is_kallsyms && !is_vdso &&
|
|
strncmp(".ko", name + strlen(name) - 3, 3)) {
|
|
debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);
|
|
if (debugfile) {
|
|
zfree(&filename);
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(false, false, true)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
if (access(filename, F_OK)) {
|
|
if (nsi && nsinfo__need_setns(nsi)) {
|
|
if (copyfile_ns(debugfile, filename,
|
|
nsi))
|
|
goto out_free;
|
|
} else if (link(debugfile, filename) &&
|
|
errno != EEXIST &&
|
|
copyfile(debugfile, filename))
|
|
goto out_free;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
tmp = strrchr(linkname, '/');
|
|
*tmp = '\0';
|
|
|
|
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
|
|
goto out_free;
|
|
|
|
*tmp = '/';
|
|
tmp = dir_name + strlen(buildid_dir) - 5;
|
|
memcpy(tmp, "../..", 5);
|
|
|
|
if (symlink(tmp, linkname) == 0) {
|
|
err = 0;
|
|
} else if (errno == EEXIST) {
|
|
char path[PATH_MAX];
|
|
ssize_t len;
|
|
|
|
len = readlink(linkname, path, sizeof(path) - 1);
|
|
if (len <= 0) {
|
|
pr_err("Can't read link: %s\n", linkname);
|
|
goto out_free;
|
|
}
|
|
path[len] = '\0';
|
|
|
|
if (strcmp(tmp, path)) {
|
|
pr_debug("build <%s> already linked to %s\n",
|
|
sbuild_id, linkname);
|
|
}
|
|
err = 0;
|
|
}
|
|
|
|
/* Update SDT cache : error is just warned */
|
|
if (realname &&
|
|
build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0)
|
|
pr_debug4("Failed to update/scan SDT cache for %s\n", realname);
|
|
|
|
out_free:
|
|
free(filename);
|
|
free(debugfile);
|
|
free(dir_name);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
int __build_id_cache__add_s(const char *sbuild_id, const char *name,
|
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name, const char *root_dir)
|
|
{
|
|
char *realname = NULL;
|
|
int err = -1;
|
|
|
|
if (!is_kallsyms) {
|
|
if (!is_vdso)
|
|
realname = nsinfo__realpath(name, nsi);
|
|
else
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
goto out_free;
|
|
}
|
|
|
|
err = build_id_cache__add(sbuild_id, name, realname, nsi,
|
|
is_kallsyms, is_vdso, proper_name, root_dir);
|
|
out_free:
|
|
if (!is_kallsyms)
|
|
free(realname);
|
|
return err;
|
|
}
|
|
|
|
static int build_id_cache__add_b(const struct build_id *bid,
|
|
const char *name, struct nsinfo *nsi,
|
|
bool is_kallsyms, bool is_vdso,
|
|
const char *proper_name,
|
|
const char *root_dir)
|
|
{
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
build_id__sprintf(bid, sbuild_id);
|
|
|
|
return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
|
|
is_vdso, proper_name, root_dir);
|
|
}
|
|
|
|
bool build_id_cache__cached(const char *sbuild_id)
|
|
{
|
|
bool ret = false;
|
|
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
|
|
if (filename && !access(filename, F_OK))
|
|
ret = true;
|
|
free(filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int build_id_cache__remove_s(const char *sbuild_id)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = zalloc(size),
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (filename == NULL || linkname == NULL)
|
|
goto out_free;
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
|
|
if (access(linkname, F_OK))
|
|
goto out_free;
|
|
|
|
if (readlink(linkname, filename, size - 1) < 0)
|
|
goto out_free;
|
|
|
|
if (unlink(linkname))
|
|
goto out_free;
|
|
|
|
/*
|
|
* Since the link is relative, we must make it absolute:
|
|
*/
|
|
tmp = strrchr(linkname, '/') + 1;
|
|
snprintf(tmp, size - (tmp - linkname), "%s", filename);
|
|
|
|
if (rm_rf(linkname))
|
|
goto out_free;
|
|
|
|
err = 0;
|
|
out_free:
|
|
free(filename);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int filename__read_build_id_ns(const char *filename,
|
|
struct build_id *bid,
|
|
struct nsinfo *nsi)
|
|
{
|
|
struct nscookie nsc;
|
|
int ret;
|
|
|
|
nsinfo__mountns_enter(nsi, &nsc);
|
|
ret = filename__read_build_id(filename, bid);
|
|
nsinfo__mountns_exit(&nsc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool dso__build_id_mismatch(struct dso *dso, const char *name)
|
|
{
|
|
struct build_id bid;
|
|
bool ret = false;
|
|
|
|
mutex_lock(dso__lock(dso));
|
|
if (filename__read_build_id_ns(name, &bid, dso__nsinfo(dso)) >= 0)
|
|
ret = !dso__build_id_equal(dso, &bid);
|
|
|
|
mutex_unlock(dso__lock(dso));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dso__cache_build_id(struct dso *dso, struct machine *machine,
|
|
void *priv __maybe_unused)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms(dso);
|
|
bool is_vdso = dso__is_vdso(dso);
|
|
const char *name = dso__long_name(dso);
|
|
const char *proper_name = NULL;
|
|
const char *root_dir = NULL;
|
|
char *allocated_name = NULL;
|
|
int ret = 0;
|
|
|
|
if (!dso__has_build_id(dso))
|
|
return 0;
|
|
|
|
if (dso__is_kcore(dso)) {
|
|
is_kallsyms = true;
|
|
name = machine->mmap_name;
|
|
}
|
|
|
|
if (!machine__is_host(machine)) {
|
|
if (*machine->root_dir) {
|
|
root_dir = machine->root_dir;
|
|
ret = asprintf(&allocated_name, "%s/%s", root_dir, name);
|
|
if (ret < 0)
|
|
return ret;
|
|
proper_name = name;
|
|
name = allocated_name;
|
|
} else if (is_kallsyms) {
|
|
/* Cannot get guest kallsyms */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!is_kallsyms && dso__build_id_mismatch(dso, name))
|
|
goto out_free;
|
|
|
|
mutex_lock(dso__lock(dso));
|
|
ret = build_id_cache__add_b(dso__bid(dso), name, dso__nsinfo(dso),
|
|
is_kallsyms, is_vdso, proper_name, root_dir);
|
|
mutex_unlock(dso__lock(dso));
|
|
out_free:
|
|
free(allocated_name);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv)
|
|
{
|
|
int ret = machine__for_each_dso(&machines->host, fn, priv);
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first_cached(&machines->guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
|
|
ret |= machine__for_each_dso(pos, fn, priv);
|
|
}
|
|
return ret ? -1 : 0;
|
|
}
|
|
|
|
int __perf_session__cache_build_ids(struct perf_session *session,
|
|
machine__dso_t fn, void *priv)
|
|
{
|
|
if (no_buildid_cache)
|
|
return 0;
|
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
|
|
return -1;
|
|
|
|
return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0;
|
|
}
|
|
|
|
int perf_session__cache_build_ids(struct perf_session *session)
|
|
{
|
|
return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL);
|
|
}
|
|
|
|
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
|
|
{
|
|
return dsos__read_build_ids(&machine->dsos, with_hits);
|
|
}
|
|
|
|
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
|
|
{
|
|
struct rb_node *nd;
|
|
bool ret = machine__read_build_ids(&session->machines.host, with_hits);
|
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd;
|
|
nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__read_build_ids(pos, with_hits);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void build_id__init(struct build_id *bid, const u8 *data, size_t size)
|
|
{
|
|
WARN_ON(size > BUILD_ID_SIZE);
|
|
memcpy(bid->data, data, size);
|
|
bid->size = size;
|
|
}
|
|
|
|
bool build_id__is_defined(const struct build_id *bid)
|
|
{
|
|
return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false;
|
|
}
|