linux-kernel - Re: [PATCH v2 01/11] of: Load KUnit DTB from of_core

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Date:   Tue, 21 Mar 2023 11:15:19 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        patches@...ts.linux.dev,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, Frank Rowand <frowand.list@...il.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, Maxime Ripard <maxime@...no.tech>
Subject: Re: [PATCH v2 01/11] of: Load KUnit DTB from of_core_init()

Quoting Rob Herring (2023-03-21 10:33:03)
> On Wed, Mar 15, 2023 at 11:37:18AM -0700, Stephen Boyd wrote:
> > diff --git a/drivers/of/of_test.c b/drivers/of/of_test.c
> > new file mode 100644
> > index 000000000000..a4d70ac344ad
> > --- /dev/null
> > +++ b/drivers/of/of_test.c
> > @@ -0,0 +1,43 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * KUnit tests for OF APIs
> > + */
> > +#include <linux/kconfig.h>
> > +#include <linux/of.h>
> > +
> > +#include <kunit/test.h>
> > +
> > +/*
> > + * Test that the root node / exists.
> > + */
> > +static void dtb_root_node_exists(struct kunit *test)
> > +{
> > +     KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_find_node_by_path("/"));
> > +}
> > +
> > +/*
> > + * Test that the /__symbols__ node exists.
> > + */
> > +static void dtb_symbols_node_exists(struct kunit *test)
> > +{
> > +     KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_find_node_by_path("/__symbols__"));
> > +}
> 
> Many base DTs will not have this. And the kunit tests themselves 
> shouldn't need it because they should be independent of the base tree.
> 

When I try to apply an overlay it fails 

 OF: overlay: no fragments or symbols in overlay
 OF: overlay: init_overlay_changeset() failed, ret = -22
     # of_overlay_apply_kunit_apply: ASSERTION FAILED at drivers/of/overlay_test.c:18
     Expected 0 == ({ extern uint8_t __dtbo_kunit_overlay_test_begin[]; extern uint8_t __dtbo_kunit_overlay_test_end[]; __of_overlay_apply_kunit((test), __dtbo_kunit_overlay_test_begin, __dtbo_kunit_overlay_test_end); }), but
         ({ extern uint8_t __dtbo_kunit_overlay_test_begin[]; extern uint8_t __dtbo_kunit_overlay_test_end[]; __of_overlay_apply_kunit((test), __dtbo_kunit_overlay_test_begin, __dtbo_kunit_overlay_test_end); }) == -12 (0xfffffffffffffff4)
 [FAILED] of_overlay_apply_kunit_apply

Now I'm trying to hack on the fake root node to see if I can make it work.

---8<---
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 090c5d7925e4..12c44c86b8ae 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -166,7 +166,7 @@ void __of_phandle_cache_inv_entry(phandle handle)
 		phandle_cache[handle_hash] = NULL;
 }
 
-#ifdef CONFIG_OF_KUNIT
+#if 0
 static int __init of_kunit_add_data(void)
 {
 	void *kunit_fdt;
diff --git a/drivers/of/kunit_overlay_test.dtso b/drivers/of/kunit_overlay_test.dtso
index 6e70e2f8cd90..e3ced1467dd9 100644
--- a/drivers/of/kunit_overlay_test.dtso
+++ b/drivers/of/kunit_overlay_test.dtso
@@ -2,7 +2,7 @@
 /dts-v1/;
 /plugin/;
 
-&kunit_bus {
+/ {
 	test-kunit {
 		compatible = "test,kunit-empty";
 	};
diff --git a/drivers/of/of_test.c b/drivers/of/of_test.c
index 543fdf0936f6..08b670aee083 100644
--- a/drivers/of/of_test.c
+++ b/drivers/of/of_test.c
@@ -15,17 +15,8 @@ static void dtb_root_node_exists(struct kunit *test)
 	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_find_node_by_path("/"));
 }
 
-/*
- * Test that the /__symbols__ node exists.
- */
-static void dtb_symbols_node_exists(struct kunit *test)
-{
-	KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_find_node_by_path("/__symbols__"));
-}
-
 static struct kunit_case dtb_test_cases[] = {
 	KUNIT_CASE(dtb_root_node_exists),
-	KUNIT_CASE(dtb_symbols_node_exists),
 	{}
 };