timestamps: You can never have enough of them!

Now that we have timestamps in pre-RAM stages, let's actually make use
of them. This patch adds several timestamps to both the bootblock and
especially the verstage to allow more fine-grained boot time tracking.

Some of the introduced timestamps can appear more than once per boot.
This doesn't seem to be a problem for both coreboot and the cbmem
utility, and the context makes it clear which operation was timestamped
at what point.

Also simplifies cbmem's timestamp printing routine a bit, fixing a
display bug when a timestamp had a section of exactly ",000," in it
(e.g. 1,000,185).

BRANCH=None
BUG=None
TEST=Booted Pinky, Blaze and Falco, confirmed that all timestamps show
up and contained sane values. Booted Storm (no timestamps here since it
doesn't support pre-RAM timestamps yet).

Change-Id: I7f4d6aba3ebe3db0d003c7bcb2954431b74961b3
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 7a2ce81722aba85beefcc6c81f9908422b8da8fa
Original-Change-Id: I5979bfa9445a9e0aba98ffdf8006c21096743456
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/234063
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9608
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

3 files changed, 52 insertions, 16 deletions

diff --git a/src/vendorcode/google/chromeos/vboot2/vboot_handoff.c b/src/vendorcode/google/chromeos/vboot2/vboot_handoff.c
index 7e91432029..a5c7de617c 100644
--- a/src/vendorcode/google/chromeos/vboot2/vboot_handoff.c
+++ b/src/vendorcode/google/chromeos/vboot2/vboot_handoff.c
@@ -40,6 +40,7 @@ static void *load_ramstage(struct vboot_handoff *vboot_handoff,
 			   struct vboot_region *fw_main)
 {
 	struct vboot_components *fw_info;
+	void *ret;
 	int i;
 
 	fw_info = vboot_locate_components(fw_main);
@@ -53,7 +54,10 @@ static void *load_ramstage(struct vboot_handoff *vboot_handoff,
 		vboot_handoff->components[i].size = fw_info->entries[i].size;
 	}
 
-	return vboot_load_stage(CONFIG_VBOOT_RAMSTAGE_INDEX, fw_main, fw_info);
+	timestamp_add_now(TS_START_COPYRAM);
+	ret = vboot_load_stage(CONFIG_VBOOT_RAMSTAGE_INDEX, fw_main, fw_info);
+	timestamp_add_now(TS_END_COPYRAM);
+	return ret;
 }
 
 /**
diff --git a/src/vendorcode/google/chromeos/vboot2/verstage.c b/src/vendorcode/google/chromeos/vboot2/verstage.c
index 289b93fefc..569e6e569c 100644
--- a/src/vendorcode/google/chromeos/vboot2/verstage.c
+++ b/src/vendorcode/google/chromeos/vboot2/verstage.c
@@ -21,7 +21,9 @@
 #include <arch/exception.h>
 #include <console/console.h>
 #include <console/vtxprintf.h>
+#include <delay.h>
 #include <string.h>
+#include <timestamp.h>
 #include <vb2_api.h>
 
 #include "../chromeos.h"
@@ -91,12 +93,22 @@ int vb2ex_read_resource(struct vb2_context *ctx,
 
 static int hash_body(struct vb2_context *ctx, struct vboot_region *fw_main)
 {
+	uint64_t load_ts;
 	uint32_t expected_size;
 	MAYBE_STATIC uint8_t block[TODO_BLOCK_SIZE];
 	size_t block_size = sizeof(block);
 	uintptr_t offset;
 	int rv;
 
+	/*
+	 * Since loading the firmware and calculating its hash is intertwined,
+	 * we use this little trick to measure them separately and pretend it
+	 * was first loaded and then hashed in one piece with the timestamps.
+	 * (This split won't make sense with memory-mapped media like on x86.)
+	 */
+	load_ts = timestamp_get();
+	timestamp_add(TS_START_HASH_BODY, load_ts);
+
 	expected_size = fw_main->size;
 	offset = fw_main->offset_addr;
 
@@ -107,13 +119,17 @@ static int hash_body(struct vb2_context *ctx, struct vboot_region *fw_main)
 
 	/* Extend over the body */
 	while (expected_size) {
+		uint64_t temp_ts;
 		void *b;
 		if (block_size > expected_size)
 			block_size = expected_size;
 
+		temp_ts = timestamp_get();
 		b = vboot_get_region(offset, block_size, block);
 		if (b == NULL)
 			return VB2_ERROR_UNKNOWN;
+		load_ts += timestamp_get() - temp_ts;
+
 		rv = vb2api_extend_hash(ctx, b, block_size);
 		if (rv)
 			return rv;
@@ -122,11 +138,16 @@ static int hash_body(struct vb2_context *ctx, struct vboot_region *fw_main)
 		offset += block_size;
 	}
 
-	/* Check the result */
+	timestamp_add(TS_DONE_LOADING, load_ts);
+	timestamp_add_now(TS_DONE_HASHING);
+
+	/* Check the result (with RSA signature verification) */
 	rv = vb2api_check_hash(ctx);
 	if (rv)
 		return rv;
 
+	timestamp_add_now(TS_END_HASH_BODY);
+
 	return VB2_SUCCESS;
 }
 
@@ -173,6 +194,7 @@ void verstage_main(void)
 	struct vboot_region fw_main;
 	struct vb2_working_data *wd = vboot_get_working_data();
 	int rv;
+	timestamp_add_now(TS_START_VBOOT);
 
 	/* Set up context and work buffer */
 	memset(&ctx, 0, sizeof(ctx));
@@ -185,7 +207,9 @@ void verstage_main(void)
 	/* Read secdata from TPM. Initialize TPM if secdata not found. We don't
 	 * check the return value here because vb2api_fw_phase1 will catch
 	 * invalid secdata and tell us what to do (=reboot). */
+	timestamp_add_now(TS_START_TPMINIT);
 	antirollback_read_space_firmware(&ctx);
+	timestamp_add_now(TS_END_TPMINIT);
 
 	if (get_developer_mode_switch())
 		ctx.flags |= VB2_CONTEXT_FORCE_DEVELOPER_MODE;
@@ -194,17 +218,18 @@ void verstage_main(void)
 		ctx.flags |= VB2_CONTEXT_FORCE_RECOVERY_MODE;
 	}
 
-	/* Do early init */
+	/* Do early init (set up secdata and NVRAM, load GBB) */
 	printk(BIOS_INFO, "Phase 1\n");
 	rv = vb2api_fw_phase1(&ctx);
 	if (rv) {
 		printk(BIOS_INFO, "Recovery requested (%x)\n", rv);
 		/* If we need recovery mode, leave firmware selection now */
 		save_if_needed(&ctx);
+		timestamp_add_now(TS_END_VBOOT);
 		return;
 	}
 
-	/* Determine which firmware slot to boot */
+	/* Determine which firmware slot to boot (based on NVRAM) */
 	printk(BIOS_INFO, "Phase 2\n");
 	rv = vb2api_fw_phase2(&ctx);
 	if (rv) {
@@ -213,9 +238,11 @@ void verstage_main(void)
 		vboot_reboot();
 	}
 
-	/* Try that slot */
+	/* Try that slot (verify its keyblock and preamble) */
 	printk(BIOS_INFO, "Phase 3\n");
+	timestamp_add_now(TS_START_VERIFY_SLOT);
 	rv = vb2api_fw_phase3(&ctx);
+	timestamp_add_now(TS_END_VERIFY_SLOT);
 	if (rv) {
 		printk(BIOS_INFO, "Reboot requested (%x)\n", rv);
 		save_if_needed(&ctx);
@@ -245,6 +272,7 @@ void verstage_main(void)
 
 	printk(BIOS_INFO, "Slot %c is selected\n", is_slot_a(&ctx) ? 'A' : 'B');
 	vb2_set_selected_region(wd, &fw_main);
+	timestamp_add_now(TS_END_VBOOT);
 }
 
 #if IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE)
diff --git a/src/vendorcode/google/chromeos/vboot2/verstub.c b/src/vendorcode/google/chromeos/vboot2/verstub.c
index 8f2e9b2d49..323468333c 100644
--- a/src/vendorcode/google/chromeos/vboot2/verstub.c
+++ b/src/vendorcode/google/chromeos/vboot2/verstub.c
@@ -21,6 +21,7 @@
 #include <cbfs.h>
 #include <console/console.h>
 #include <string.h>
+#include <timestamp.h>
 #include "../chromeos.h"
 #include "misc.h"
 #include "symbols.h"
@@ -58,20 +59,22 @@ void vboot2_verify_firmware(void)
 
 	wd = init_vb2_working_data();
 
-#if CONFIG_RETURN_FROM_VERSTAGE
-	/* load verstage from RO */
-	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
-				CONFIG_CBFS_PREFIX "/verstage");
-	if (entry == (void *)-1)
-		die("failed to load verstage");
+	if (IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE)) {
+		/* load verstage from RO */
+		entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
+					CONFIG_CBFS_PREFIX "/verstage");
+		if (entry == (void *)-1)
+			die("failed to load verstage");
 
-	/* verify and select a slot */
-	stage_exit(entry);
-#else
-	verstage_main();
-#endif /* CONFIG_RETURN_FROM_VERSTAGE */
+		timestamp_add_now(TS_END_COPYVER);
+		/* verify and select a slot */
+		stage_exit(entry);
+	} else {
+		verstage_main();
+	}
 
 	/* jump to the selected slot */
+	timestamp_add_now(TS_START_COPYROM);
 	entry = NULL;
 	if (vboot_is_slot_selected(wd)) {
 		/* RW A or B */
@@ -88,6 +91,7 @@ void vboot2_verify_firmware(void)
 		entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
 					CONFIG_CBFS_PREFIX "/romstage");
 	}
+	timestamp_add_now(TS_END_COPYROM);
 
 	if (entry != NULL && entry != (void *)-1)
 		stage_exit(entry);