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, 3 insertions, 38 deletions

diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index 8d004bad33..1d5b6f9e72 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -24,6 +24,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 
+#include "acpi-fpdt.h"
 #include "util.h"
 #include "utf8.h"
 #include "efivars.h"
@@ -413,7 +414,7 @@ static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
         return 0;
 }
 
-static int get_boot_usec(usec_t *firmware, usec_t *loader) {
+int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) {
         uint64_t x, y;
         int r;
 
@@ -440,43 +441,7 @@ static int get_boot_usec(usec_t *firmware, usec_t *loader) {
         return 0;
 }
 
-int efi_get_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 = 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;
-}
-
-int efi_get_loader_device_part_uuid(sd_id128_t *u) {
+int efi_loader_get_device_part_uuid(sd_id128_t *u) {
         _cleanup_free_ char *p = NULL;
         int r, parsed[16];
         unsigned i;