sandbox: Reduce keyed autoboot delay

The autoboot tests are a recent addition to U-Boot, providing much-needed
coverage in this area.

A side effect of the keyed autoboot test is that this feature is enabled
in sandbox always. This changes the autoboot prompt and confuses the
pytests. Some tests become slower, for example the vboot tests take about
27s now instead of 3s.

We don't actually need this feature enabled to be able to run the tests.
Add a switch to allow sandbox to turn it on and off as needed. Use this
in the one test that needs it.

Add a command-line flag in case this is desired in normal use.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 25c8b9f298 ("test: add first autoboot unit tests")
Reviewed-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>

arch/sandbox/cpu/start.c

@@ -400,6 +400,15 @@ static int sandbox_cmdline_cb_signals(struct sandbox_state *state,
 SANDBOX_CMDLINE_OPT_SHORT(signals, 'S', 0,
 			  "Handle signals (such as SIGSEGV) in sandbox");
 
+static int sandbox_cmdline_cb_autoboot_keyed(struct sandbox_state *state,
+					     const char *arg)
+{
+	state->autoboot_keyed = true;
+
+	return 0;
+}
+SANDBOX_CMDLINE_OPT(autoboot_keyed, 0, "Allow keyed autoboot");
+
 static void setup_ram_buf(struct sandbox_state *state)
 {
 	/* Zero the RAM buffer if we didn't read it, to keep valgrind happy */

arch/sandbox/cpu/state.c

@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <autoboot.h>
 #include <bloblist.h>
 #include <errno.h>
 #include <fdtdec.h>
@@ -378,6 +379,23 @@ void state_reset_for_test(struct sandbox_state *state)
 	state->next_tag = state->ram_size;
 }
 
+bool autoboot_keyed(void)
+{
+	struct sandbox_state *state = state_get_current();
+
+	return IS_ENABLED(CONFIG_AUTOBOOT_KEYED) && state->autoboot_keyed;
+}
+
+bool autoboot_set_keyed(bool autoboot_keyed)
+{
+	struct sandbox_state *state = state_get_current();
+	bool old_val = state->autoboot_keyed;
+
+	state->autoboot_keyed = autoboot_keyed;
+
+	return old_val;
+}
+
 int state_init(void)
 {
 	state = &main_state;

arch/sandbox/include/asm/state.h

@@ -94,6 +94,7 @@ struct sandbox_state {
 	bool run_unittests;		/* Run unit tests */
 	const char *select_unittests;	/* Unit test to run */
 	bool handle_signals;		/* Handle signals within sandbox */
+	bool autoboot_keyed;		/* Use keyed-autoboot feature */
 
 	/* Pointer to information for each SPI bus/cs */
 	struct sandbox_spi_info spi[CONFIG_SANDBOX_SPI_MAX_BUS]

common/autoboot.c

@@ -406,7 +406,7 @@ static int abortboot(int bootdelay)
 	int abort = 0;
 
 	if (bootdelay >= 0) {
-		if (IS_ENABLED(CONFIG_AUTOBOOT_KEYED))
+		if (autoboot_keyed())
 			abort = abortboot_key_sequence(bootdelay);
 		else
 			abort = abortboot_single_key(bootdelay);
@@ -481,7 +481,7 @@ void autoboot_command(const char *s)
 		bool lock;
 		int prev;
 
-		lock = IS_ENABLED(CONFIG_AUTOBOOT_KEYED) &&
+		lock = autoboot_keyed() &&
 			!IS_ENABLED(CONFIG_AUTOBOOT_KEYED_CTRLC);
 		if (lock)
 			prev = disable_ctrlc(1); /* disable Ctrl-C checking */
@@ -498,4 +498,4 @@ void autoboot_command(const char *s)
 		if (s)
 			run_command_list(s, -1, 0);
 	}
-}
+}

include/autoboot.h

@@ -11,6 +11,42 @@
 #ifndef __AUTOBOOT_H
 #define __AUTOBOOT_H
 
+#include <stdbool.h>
+
+#ifdef CONFIG_SANDBOX
+
+/**
+ * autoboot_keyed() - check whether keyed autoboot should be used
+ *
+ * This is only implemented for sandbox since other platforms don't have a way
+ * of controlling the feature at runtime.
+ *
+ * @return true if enabled, false if not
+ */
+bool autoboot_keyed(void);
+
+/**
+ * autoboot_set_keyed() - set whether keyed autoboot should be used
+ *
+ * @autoboot_keyed: true to enable the feature, false to disable
+ * @return old value of the flag
+ */
+bool autoboot_set_keyed(bool autoboot_keyed);
+#else
+static inline bool autoboot_keyed(void)
+{
+	/* There is no runtime flag, so just use the CONFIG */
+	return IS_ENABLED(CONFIG_AUTOBOOT_KEYED);
+}
+
+static inline bool autoboot_set_keyed(bool autoboot_keyed)
+{
+	/* There is no runtime flag to set */
+	return false;
+}
+
+#endif
+
 #ifdef CONFIG_AUTOBOOT
 /**
  * bootdelay_process() - process the bootd delay

test/common/test_autoboot.c

@@ -16,13 +16,19 @@
 static int check_for_input(struct unit_test_state *uts, const char *in,
 			   bool correct)
 {
+	bool old_val;
 	/* The bootdelay is set to 1 second in test_autoboot() */
 	const char *autoboot_prompt =
 		"Enter password \"a\" in 1 seconds to stop autoboot";
 
 	console_record_reset_enable();
 	console_in_puts(in);
+
+	/* turn on keyed autoboot for the test, if possible */
+	old_val = autoboot_set_keyed(true);
 	autoboot_command("echo Autoboot password unlock not successful");
+	old_val = autoboot_set_keyed(old_val);
+
 	ut_assert_nextline(autoboot_prompt);
 	if (!correct)
 		ut_assert_nextline("Autoboot password unlock not successful");