bootstage: Implement core microsecond boot time measurement

This defines the basics of a new boot time measurement feature. This allows
logging of very accurate time measurements as the boot proceeds, by using
an available microsecond counter.

To enable the feature, define CONFIG_BOOTSTAGE in your board config file.
Also available is CONFIG_BOOTSTAGE_REPORT which will cause a report to be
printed just before handing off to the OS.

Most IDs are not named at this stage. For that I would first like to
renumber them all.

Timer summary in microseconds:
       Mark    Elapsed  Stage
          0          0  reset
    205,000    205,000  board_init_f
  6,053,000  5,848,000  bootm_start
  6,053,000          0  id=1
  6,058,000      5,000  id=101
  6,058,000          0  id=100
  6,061,000      3,000  id=103
  6,064,000      3,000  id=104
  6,093,000     29,000  id=107
  6,093,000          0  id=106
  6,093,000          0  id=105
  6,093,000          0  id=108
  7,089,000    996,000  id=7
  7,089,000          0  id=15
  7,089,000          0  id=8
  7,097,000      8,000  start_kernel

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/include/bootstage.h b/include/bootstage.h
index b56d95351c..06ab2c8ef0 100644
--- a/include/bootstage.h
+++ b/include/bootstage.h
@@ -26,6 +26,11 @@
 #ifndef _BOOTSTAGE_H
 #define _BOOTSTAGE_H
 
+/* The number of boot stage records available for the user */
+#ifndef CONFIG_BOOTSTAGE_USER_COUNT
+#define CONFIG_BOOTSTAGE_USER_COUNT	20
+#endif
+
 /*
  * A list of boot stages that we know about. Each of these indicates the
  * state that we are at, and the action that we are about to perform. For
@@ -169,6 +174,33 @@ enum bootstage_id {
 
 	BOOTSTAGE_ID_NAND_FIT_READ = 150,
 	BOOTSTAGE_ID_NAND_FIT_READ_OK,
+
+	/*
+	 * These boot stages are new, higher level, and not directly related
+	 * to the old boot progress numbers. They are useful for recording
+	 * rough boot timing information.
+	 */
+	BOOTSTAGE_ID_AWAKE,
+	BOOTSTAGE_ID_START_UBOOT_F,
+	BOOTSTAGE_ID_START_UBOOT_R,
+	BOOTSTAGE_ID_USB_START,
+	BOOTSTAGE_ID_ETH_START,
+	BOOTSTAGE_ID_BOOTP_START,
+	BOOTSTAGE_ID_BOOTP_STOP,
+	BOOTSTAGE_ID_BOOTM_START,
+	BOOTSTAGE_ID_BOOTM_HANDOFF,
+	BOOTSTAGE_ID_MAIN_LOOP,
+	BOOTSTAGE_KERNELREAD_START,
+	BOOTSTAGE_KERNELREAD_STOP,
+
+	BOOTSTAGE_ID_CPU_AWAKE,
+	BOOTSTAGE_ID_MAIN_CPU_AWAKE,
+	BOOTSTAGE_ID_MAIN_CPU_READY,
+
+	/* a few spare for the user, from here */
+	BOOTSTAGE_ID_USER,
+	BOOTSTAGE_ID_COUNT = BOOTSTAGE_ID_USER + CONFIG_BOOTSTAGE_USER_COUNT,
+	BOOTSTAGE_ID_ALLOC,
 };
 
 /*
@@ -189,6 +221,11 @@ ulong bootstage_mark(enum bootstage_id id);
 
 ulong bootstage_error(enum bootstage_id id);
 
+ulong bootstage_mark_name(enum bootstage_id id, const char *name);
+
+/* Print a report about boot time */
+void bootstage_report(void);
+
 #else
 /*
  * This is a dummy implementation which just calls show_boot_progress(),
@@ -207,6 +244,12 @@ static inline ulong bootstage_error(enum bootstage_id id)
 	return 0;
 }
 
+static inline ulong bootstage_mark_name(enum bootstage_id id, const char *name)
+{
+	return 0;
+}
+
+
 #endif /* CONFIG_BOOTSTAGE */
 
 #endif