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authorKay Sievers <kay@vrfy.org>2013-09-23 17:23:35 -0500
committerKay Sievers <kay@vrfy.org>2013-09-24 15:43:41 +0200
commitc51d84dc09476d9c06b8aac726220bf3c7d62e8d (patch)
tree3440df30c67dc883a896c88b653804240f5bf783 /src/shared/boot-timestamps.c
parent036ae95ac4a425475b58e1a8e53d5c52b2c8a218 (diff)
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.
Diffstat (limited to 'src/shared/boot-timestamps.c')
-rw-r--r--src/shared/boot-timestamps.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/shared/boot-timestamps.c b/src/shared/boot-timestamps.c
new file mode 100644
index 0000000000..944996582e
--- /dev/null
+++ b/src/shared/boot-timestamps.c
@@ -0,0 +1,65 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 <unistd.h>
+
+#include "boot-timestamps.h"
+#include "acpi-fpdt.h"
+#include "efivars.h"
+
+int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) {
+ usec_t x, y, a;
+ int r;
+ dual_timestamp _n;
+
+ assert(firmware);
+ assert(loader);
+
+ if (!n) {
+ dual_timestamp_get(&_n);
+ n = &_n;
+ }
+
+ r = acpi_get_boot_usec(&x, &y);
+ if (r < 0) {
+ r = efi_loader_get_boot_usec(&x, &y);
+ if (r < 0)
+ return r;
+ }
+
+ /* Let's convert this to timestamps where the firmware
+ * began/loader began working. To make this more confusing:
+ * since usec_t is unsigned and the kernel's monotonic clock
+ * begins at kernel initialization we'll actually initialize
+ * the monotonic timestamps here as negative of the actual
+ * value. */
+
+ firmware->monotonic = y;
+ loader->monotonic = y - x;
+
+ a = n->monotonic + firmware->monotonic;
+ firmware->realtime = n->realtime > a ? n->realtime - a : 0;
+
+ a = n->monotonic + loader->monotonic;
+ loader->realtime = n->realtime > a ? n->realtime - a : 0;
+
+ return 0;
+}