sandbox: Add a flag to set the default log level

It is useful to be able to set the default log level from the command line
when running sandbox. Add a new -L command-line flag for this. The log
level is set using the enum log_level_t in log.h. At present a number must
be specified, e.g. -L7 for debug.

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

arch/sandbox/cpu/start.c

@@ -273,6 +273,16 @@ static int sandbox_cmdline_cb_verbose(struct sandbox_state *state,
 }
 SANDBOX_CMDLINE_OPT_SHORT(verbose, 'v', 0, "Show test output");
 
+static int sandbox_cmdline_cb_log_level(struct sandbox_state *state,
+					const char *arg)
+{
+	state->default_log_level = simple_strtol(arg, NULL, 10);
+
+	return 0;
+}
+SANDBOX_CMDLINE_OPT_SHORT(log_level, 'L', 1,
+			  "Set log level (0=panic, 7=debug)");
+
 int board_run_command(const char *cmdline)
 {
 	printf("## Commands are disabled. Please enable CONFIG_CMDLINE.\n");
@@ -313,6 +323,9 @@ int main(int argc, char *argv[])
 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
 	gd->malloc_base = CONFIG_MALLOC_F_ADDR;
 #endif
+#if CONFIG_IS_ENABLED(LOG)
+	gd->default_log_level = state->default_log_level;
+#endif
 	setup_ram_buf(state);
 
 	/* Do pre- and post-relocation init */

arch/sandbox/include/asm/state.h

@@ -89,6 +89,7 @@ struct sandbox_state {
 	enum state_terminal_raw term_raw;	/* Terminal raw/cooked */
 	bool skip_delays;		/* Ignore any time delays (for test) */
 	bool show_test_output;		/* Don't suppress stdout in tests */
+	int default_log_level;		/* Default log level for sandbox */
 
 	/* Pointer to information for each SPI bus/cs */
 	struct sandbox_spi_info spi[CONFIG_SANDBOX_SPI_MAX_BUS]

common/log.c

@@ -315,7 +315,8 @@ int log_init(void)
 		drv++;
 	}
 	gd->flags |= GD_FLG_LOG_READY;
-	gd->default_log_level = LOGL_INFO;
+	if (!gd->default_log_level)
+		gd->default_log_level = LOGL_INFO;
 	gd->log_fmt = LOGF_DEFAULT;
 
 	return 0;