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Date: Wed, 26 Aug 2015 14:28:19 +0200
From: Alexander Holler <holler@...oftware.de>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
Greg KH <gregkh@...uxfoundation.org>,
Russel King <linux@....linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Grant Likely <grant.likely@...aro.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Alexander Holler <holler@...oftware.de>
Subject: [PATCH 07/16] deps: add debug configuration options
Add some debug options to print annotated initcalls, the ordered list of
annotated initcalls and to print a message right before an annotated
initcall is called.
Signed-off-by: Alexander Holler <holler@...oftware.de>
---
drivers/of/Kconfig | 18 ++++++++++++++
drivers/of/of_dependencies.c | 57 ++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 73 insertions(+), 2 deletions(-)
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 9bf6c73..26c4b1a 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -114,4 +114,22 @@ config OF_DEPENDENCIES
If unsure, say N here.
+config OF_DEPENDENCIES_PRINT_INIT_ORDER
+ bool "Print dependency based initialization order"
+ depends on OF_DEPENDENCIES
+ help
+ Used for debugging purposes.
+
+config OF_DEPENDENCIES_PRINT_ANNOTATED_INITCALLS
+ bool "Print names of annotated drivers"
+ depends on OF_DEPENDENCIES
+ help
+ Used for debugging purposes.
+
+config OF_DEPENDENCIES_DEBUG_CALLS_OF_ANNOTATED_INITCALLS
+ bool "Show when annotated initcalls are actually called"
+ depends on OF_DEPENDENCIES
+ help
+ Used for debugging purposes.
+
endif # OF
diff --git a/drivers/of/of_dependencies.c b/drivers/of/of_dependencies.c
index 64ed049..06435d5 100644
--- a/drivers/of/of_dependencies.c
+++ b/drivers/of/of_dependencies.c
@@ -336,6 +336,41 @@ static void __init of_init_remove_duplicates(void)
}
}
+#ifdef CONFIG_OF_DEPENDENCIES_PRINT_INIT_ORDER
+static void __init of_init_print_order(void)
+{
+ unsigned i;
+ struct property *prop;
+ const char *cp;
+
+ pr_info("Initialization order:\n");
+ for (i = 0; i < order.count; ++i) {
+ pr_info("init %u 0x%x", i, order.order[i]->phandle);
+ if (order.order[i]->name)
+ pr_cont(" %s", order.order[i]->name);
+ if (order.order[i]->full_name)
+ pr_cont(" (%s)", order.order[i]->full_name);
+ prop = __of_find_property(order.order[i], "compatible", NULL);
+ for (cp = of_prop_next_string(prop, NULL); cp;
+ cp = of_prop_next_string(prop, cp))
+ pr_cont(" %s", cp);
+ }
+}
+#endif
+
+#ifdef CONFIG_OF_DEPENDENCIES_PRINT_ANNOTATED_INITCALLS
+static void __init of_init_print_annotated(void)
+{
+ struct _annotated_initcall *ac;
+
+ pr_info("Annotated drivers:\n");
+ ac = __annotated_initcall_start;
+ for (; ac < __annotated_initcall_end; ++ac)
+ pr_info("Driver '%s' (%s)\n", ac->driver->name,
+ ac->driver->of_match_table->compatible);
+}
+#endif
+
static int __init of_init_build_order(void)
{
int rc = 0;
@@ -363,7 +398,12 @@ static int __init of_init_build_order(void)
return -EINVAL; /* cycle found */
of_init_remove_duplicates();
-
+#ifdef CONFIG_OF_DEPENDENCIES_PRINT_INIT_ORDER
+ of_init_print_order();
+#endif
+#ifdef CONFIG_OF_DEPENDENCIES_PRINT_ANNOTATED_INITCALLS
+ of_init_print_annotated();
+#endif
return rc;
}
@@ -386,6 +426,12 @@ static void __init init_if_matched(struct device_node *node)
if (ac->initcall && ac->driver->of_match_table)
if (of_match_node(ac->driver->of_match_table,
node)) {
+#ifdef CONFIG_OF_DEPENDENCIES_DEBUG_CALLS_OF_ANNOTATED_INITCALLS
+ pr_info("Calling (ordered) initcall for driver %s (%s)\n",
+ ac->driver->name,
+ ac->driver->of_match_table ?
+ ac->driver->of_match_table->compatible : "");
+#endif
do_one_initcall(*ac->initcall);
ac->initcall = 0;
}
@@ -404,7 +450,14 @@ void __init of_init_drivers(void)
}
ac = __annotated_initcall_start;
for (; ac < __annotated_initcall_end; ++ac) {
- if (ac->initcall)
+ if (ac->initcall) {
+#ifdef CONFIG_OF_DEPENDENCIES_DEBUG_CALLS_OF_ANNOTATED_INITCALLS
+ pr_info("Calling (unordered) initcall for driver %s (%s)\n",
+ ac->driver->name,
+ ac->driver->of_match_table ?
+ ac->driver->of_match_table->compatible : "");
+#endif
do_one_initcall(*ac->initcall);
+ }
}
}
--
2.1.0
--
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