support acpi firmware performance data (FPDT)

Prefer firmware-provided performance data over loader-exported ones; if
ACPI data is available, always use it, otherwise try to read the loader
data.

The firmware-provided variables start at the time the first EFI image
is executed and end when the operating system exits the boot services;
the (loader) time calculated in systemd-analyze increases.

1 files changed, 98 insertions, 0 deletions

diff --git a/src/test/test-boot-timestamps.c b/src/test/test-boot-timestamps.c
new file mode 100644
index 000000000..4ede318e3
--- /dev/null
+++ b/src/test/test-boot-timestamps.c
@@ -0,0 +1,98 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+  Copyright 2013 Kay Sievers
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "log.h"
+#include "boot-timestamps.h"
+#include "efivars.h"
+#include "acpi-fpdt.h"
+
+static int test_acpi_fpdt(void) {
+        usec_t loader_start;
+        usec_t loader_exit;
+        char ts_start[FORMAT_TIMESPAN_MAX];
+        char ts_exit[FORMAT_TIMESPAN_MAX];
+        char ts_span[FORMAT_TIMESPAN_MAX];
+        int r;
+
+        r = acpi_get_boot_usec(&loader_start, &loader_exit);
+        if (r < 0) {
+                if (r != -ENOENT)
+                        log_error("Failed to read ACPI FPDT: %s", strerror(-r));
+                return r;
+        }
+
+        log_info("ACPI FPDT: loader start=%s exit=%s duration=%s",
+                 format_timespan(ts_start, sizeof(ts_start), loader_start, USEC_PER_MSEC),
+                 format_timespan(ts_exit, sizeof(ts_exit), loader_exit, USEC_PER_MSEC),
+                 format_timespan(ts_span, sizeof(ts_span), loader_exit - loader_start, USEC_PER_MSEC));
+
+        return 0;
+}
+
+static int test_efi_loader(void) {
+        usec_t loader_start;
+        usec_t loader_exit;
+        char ts_start[FORMAT_TIMESPAN_MAX];
+        char ts_exit[FORMAT_TIMESPAN_MAX];
+        char ts_span[FORMAT_TIMESPAN_MAX];
+        int r;
+
+        r = efi_loader_get_boot_usec(&loader_start, &loader_exit);
+        if (r < 0) {
+                if (r != -ENOENT)
+                        log_error("Failed to read EFI loader data: %s", strerror(-r));
+                return r;
+        }
+
+        log_info("EFI Loader: start=%s exit=%s duration=%s",
+                 format_timespan(ts_start, sizeof(ts_start), loader_start, USEC_PER_MSEC),
+                 format_timespan(ts_exit, sizeof(ts_exit), loader_exit, USEC_PER_MSEC),
+                 format_timespan(ts_span, sizeof(ts_span), loader_exit - loader_start, USEC_PER_MSEC));
+
+        return 0;
+}
+
+int main(int argc, char* argv[]) {
+        char s[MAX(FORMAT_TIMESPAN_MAX, FORMAT_TIMESTAMP_MAX)];
+        int r;
+        dual_timestamp fw, l, k;
+
+        test_acpi_fpdt();
+        test_efi_loader();
+
+        dual_timestamp_from_monotonic(&k, 0);
+
+        r = boot_timestamps(NULL, &fw, &l);
+        if (r < 0) {
+                log_error("Failed to read variables: %s", strerror(-r));
+                return 1;
+        }
+
+        log_info("Firmware began %s before kernel.", format_timespan(s, sizeof(s), fw.monotonic, 0));
+        log_info("Loader began %s before kernel.", format_timespan(s, sizeof(s), l.monotonic, 0));
+        log_info("Firmware began %s.", format_timestamp(s, sizeof(s), fw.realtime));
+        log_info("Loader began %s.", format_timestamp(s, sizeof(s), l.realtime));
+        log_info("Kernel began %s.", format_timestamp(s, sizeof(s), k.realtime));
+
+        return 0;
+}