This patch adds overlay tests to the OF selftest.
It tests overlay device addition/removal and whether
the apply revert sequence is correct.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
Documentation/devicetree/bindings/selftest.txt | 14 +
drivers/of/selftest.c | 481 +++++++++++++++++++++++++
drivers/of/testcase-data/testcases.dtsi | 1 +
drivers/of/testcase-data/tests-overlay.dtsi | 180 +++++++++
4 files changed, 676 insertions(+)
create mode 100644 Documentation/devicetree/bindings/selftest.txt
create mode 100644 drivers/of/testcase-data/tests-overlay.dtsi
diff --git a/Documentation/devicetree/bindings/selftest.txt b/Documentation/devicetree/bindings/selftest.txt
new file mode 100644
index 0000000..0f92a22
--- /dev/null
+++ b/Documentation/devicetree/bindings/selftest.txt
@@ -0,0 +1,14 @@
+* OF selftest platform device
+
+** selftest
+
+Required properties:
+- compatible: must be "selftest"
+
+All other properties are optional.
+
+Example:
+ selftest {
+ compatible = "selftest";
+ status = "okay";
+ };
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 077314e..1c74676 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -15,6 +15,8 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
static struct selftest_results {
int passed;
@@ -517,6 +519,484 @@ static void __init of_selftest_platform_populate(void)
}
}
+#ifdef CONFIG_OF_OVERLAY
+
+static int selftest_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+
+ if (np == NULL) {
+ dev_err(dev, "No OF data for device\n");
+ return -EINVAL;
+
+ }
+
+ dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+ return 0;
+}
+
+static int selftest_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+
+ dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+ return 0;
+}
+
+static struct of_device_id selftest_match[] = {
+ { .compatible = "selftest", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, altera_jtaguart_match);
+
+static struct platform_driver selftest_driver = {
+ .probe = selftest_probe,
+ .remove = selftest_remove,
+ .driver = {
+ .name = "selftest",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(selftest_match),
+ },
+};
+
+/* get the platform device instantiated at the path */
+static struct platform_device *of_path_to_platform_device(const char *path)
+{
+ struct device_node *np;
+ struct platform_device *pdev;
+
+ np = of_find_node_by_path(path);
+ if (np == NULL)
+ return NULL;
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+
+ return pdev;
+}
+
+/* find out if a platform device exists at that path */
+static int of_path_platform_device_exists(const char *path)
+{
+ struct platform_device *pdev;
+
+ pdev = of_path_to_platform_device(path);
+ platform_device_put(pdev);
+ return pdev != NULL;
+}
+
+static const char *selftest_path(int nr)
+{
+ static char buf[256];
+
+ snprintf(buf, sizeof(buf) - 1,
+ "/testcase-data/overlay-node/test-bus/test-selftest%d", nr);
+ buf[sizeof(buf) - 1] = '\0';
+
+ return buf;
+}
+
+static const char *overlay_path(int nr)
+{
+ static char buf[256];
+
+ snprintf(buf, sizeof(buf) - 1,
+ "/testcase-data/overlay%d", nr);
+ buf[sizeof(buf) - 1] = '\0';
+
+ return buf;
+}
+
+static const char *bus_path = "/testcase-data/overlay-node/test-bus";
+
+static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
+ int *overlay_id)
+{
+ struct device_node *np = NULL;
+ int ret, id = -1;
+
+ np = of_find_node_by_path(overlay_path(overlay_nr));
+ if (np == NULL) {
+ selftest(0, "could not find overlay node @\"%s\"\n",
+ overlay_path(overlay_nr));
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = of_overlay_create(np);
+ if (ret < 0) {
+ selftest(0, "could not create overlay from \"%s\"\n",
+ overlay_path(overlay_nr));
+ goto out;
+ }
+ id = ret;
+
+ ret = 0;
+
+out:
+ of_node_put(np);
+
+ if (overlay_id)
+ *overlay_id = id;
+
+ return ret;
+}
+
+/* apply an overlay while checking before and after states */
+static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
+ int before, int after)
+{
+ int ret;
+
+ /* selftest device must not be in before state */
+ if (of_path_platform_device_exists(selftest_path(selftest_nr))
+ != before) {
+ selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr),
+ !before ? "enabled" : "disabled");
+ return -EINVAL;
+ }
+
+ ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, NULL);
+ if (ret != 0) {
+ /* of_selftest_apply_overlay already called selftest() */
+ return ret;
+ }
+
+ /* selftest device must be to set to after state */
+ if (of_path_platform_device_exists(selftest_path(selftest_nr))
+ != after) {
+ selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr),
+ !after ? "enabled" : "disabled");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* apply an overlay and then revert it while checking before, after states */
+static int of_selftest_apply_revert_overlay_check(int overlay_nr,
+ int selftest_nr, int before, int after)
+{
+ int ret, ov_id;
+
+ /* selftest device must be in before state */
+ if (of_path_platform_device_exists(selftest_path(selftest_nr))
+ != before) {
+ selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr),
+ !before ? "enabled" : "disabled");
+ return -EINVAL;
+ }
+
+ /* apply the overlay */
+ ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, &ov_id);
+ if (ret != 0) {
+ /* of_selftest_apply_overlay already called selftest() */
+ return ret;
+ }
+
+ /* selftest device must be in after state */
+ if (of_path_platform_device_exists(selftest_path(selftest_nr))
+ != after) {
+ selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr),
+ !after ? "enabled" : "disabled");
+ return -EINVAL;
+ }
+
+ ret = of_overlay_destroy(ov_id);
+ if (ret != 0) {
+ selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr));
+ return ret;
+ }
+
+ /* selftest device must be again in before state */
+ if (of_path_platform_device_exists(selftest_path(selftest_nr))
+ != before) {
+ selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
+ overlay_path(overlay_nr),
+ selftest_path(selftest_nr),
+ !before ? "enabled" : "disabled");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* test activation of device */
+static void of_selftest_overlay_0(void)
+{
+ int ret;
+
+ /* device should enable */
+ ret = of_selftest_apply_overlay_check(0, 0, 0, 1);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 0);
+}
+
+/* test deactivation of device */
+static void of_selftest_overlay_1(void)
+{
+ int ret;
+
+ /* device should disable */
+ ret = of_selftest_apply_overlay_check(1, 1, 1, 0);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 1);
+}
+
+/* test activation of device */
+static void of_selftest_overlay_2(void)
+{
+ int ret;
+
+ /* device should enable */
+ ret = of_selftest_apply_overlay_check(2, 2, 0, 1);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 2);
+}
+
+/* test deactivation of device */
+static void of_selftest_overlay_3(void)
+{
+ int ret;
+
+ /* device should disable */
+ ret = of_selftest_apply_overlay_check(3, 3, 1, 0);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 3);
+}
+
+/* test activation of a full device node */
+static void of_selftest_overlay_4(void)
+{
+ int ret;
+
+ /* device should disable */
+ ret = of_selftest_apply_overlay_check(4, 4, 0, 1);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 4);
+}
+
+/* test overlay apply/revert sequence */
+static void of_selftest_overlay_5(void)
+{
+ int ret;
+
+ /* device should disable */
+ ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1);
+ if (ret != 0)
+ return;
+
+ selftest(1, "overlay test %d passed\n", 5);
+}
+
+/* test overlay application in sequence */
+static void of_selftest_overlay_6(void)
+{
+ struct device_node *np;
+ int ret, i, ov_id[2];
+ int overlay_nr = 6, selftest_nr = 6;
+ int before = 0, after = 1;
+
+ /* selftest device must be in before state */
+ for (i = 0; i < 2; i++) {
+ if (of_path_platform_device_exists(
+ selftest_path(selftest_nr + i))
+ != before) {
+ selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
+ overlay_path(overlay_nr + i),
+ selftest_path(selftest_nr + i),
+ !before ? "enabled" : "disabled");
+ return;
+ }
+ }
+
+ /* apply the overlays */
+ for (i = 0; i < 2; i++) {
+
+ np = of_find_node_by_path(overlay_path(overlay_nr + i));
+ if (np == NULL) {
+ selftest(0, "could not find overlay node @\"%s\"\n",
+ overlay_path(overlay_nr + i));
+ return;
+ }
+
+ ret = of_overlay_create(np);
+ if (ret < 0) {
+ selftest(0, "could not create overlay from \"%s\"\n",
+ overlay_path(overlay_nr + i));
+ return;
+ }
+ ov_id[i] = ret;
+ }
+
+ for (i = 0; i < 2; i++) {
+ /* selftest device must be in after state */
+ if (of_path_platform_device_exists(
+ selftest_path(selftest_nr + i))
+ != after) {
+ selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
+ overlay_path(overlay_nr + i),
+ selftest_path(selftest_nr + i),
+ !after ? "enabled" : "disabled");
+ return;
+ }
+ }
+
+ for (i = 1; i >= 0; i--) {
+ ret = of_overlay_destroy(ov_id[i]);
+ if (ret != 0) {
+ selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
+ overlay_path(overlay_nr + i),
+ selftest_path(selftest_nr + i));
+ return;
+ }
+ }
+
+ for (i = 0; i < 2; i++) {
+ /* selftest device must be again in before state */
+ if (of_path_platform_device_exists(
+ selftest_path(selftest_nr + i))
+ != before) {
+ selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
+ overlay_path(overlay_nr + i),
+ selftest_path(selftest_nr + i),
+ !before ? "enabled" : "disabled");
+ return;
+ }
+ }
+
+ selftest(1, "overlay test %d passed\n", 6);
+}
+
+/* test overlay application in sequence */
+static void of_selftest_overlay_8(void)
+{
+ struct device_node *np;
+ int ret, i, ov_id[2];
+ int overlay_nr = 8, selftest_nr = 8;
+
+ /* we don't care about device state in this test */
+
+ /* apply the overlays */
+ for (i = 0; i < 2; i++) {
+
+ np = of_find_node_by_path(overlay_path(overlay_nr + i));
+ if (np == NULL) {
+ selftest(0, "could not find overlay node @\"%s\"\n",
+ overlay_path(overlay_nr + i));
+ return;
+ }
+
+ ret = of_overlay_create(np);
+ if (ret < 0) {
+ selftest(0, "could not create overlay from \"%s\"\n",
+ overlay_path(overlay_nr + i));
+ return;
+ }
+ ov_id[i] = ret;
+ }
+
+ /* now try to remove first overlay (it should fail) */
+ ret = of_overlay_destroy(ov_id[0]);
+ if (ret == 0) {
+ selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
+ overlay_path(overlay_nr + 0),
+ selftest_path(selftest_nr));
+ return;
+ }
+
+ /* removing them in order should work */
+ for (i = 1; i >= 0; i--) {
+ ret = of_overlay_destroy(ov_id[i]);
+ if (ret != 0) {
+ selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
+ overlay_path(overlay_nr + i),
+ selftest_path(selftest_nr));
+ return;
+ }
+ }
+
+ selftest(1, "overlay test %d passed\n", 8);
+}
+
+static void __init of_selftest_overlay(void)
+{
+ struct device_node *bus_np = NULL;
+ int ret;
+
+ ret = platform_driver_register(&selftest_driver);
+ if (ret != 0) {
+ selftest(0, "could not register selftest driver\n");
+ goto out;
+ }
+
+ bus_np = of_find_node_by_path(bus_path);
+ if (bus_np == NULL) {
+ selftest(0, "could not find bus_path \"%s\"\n", bus_path);
+ goto out;
+ }
+
+ ret = of_platform_populate(bus_np, of_default_bus_match_table,
+ NULL, NULL);
+ if (ret != 0) {
+ selftest(0, "could not populate bus @ \"%s\"\n", bus_path);
+ goto out;
+ }
+
+ if (!of_path_platform_device_exists(selftest_path(100))) {
+ selftest(0, "could not find selftest0 @ \"%s\"\n",
+ selftest_path(100));
+ goto out;
+ }
+
+ if (of_path_platform_device_exists(selftest_path(101))) {
+ selftest(0, "selftest1 @ \"%s\" should not exist\n",
+ selftest_path(101));
+ goto out;
+ }
+
+ selftest(1, "basic infrastructure of overlays passed");
+
+ /* tests in sequence */
+ of_selftest_overlay_0();
+ of_selftest_overlay_1();
+ of_selftest_overlay_2();
+ of_selftest_overlay_3();
+ of_selftest_overlay_4();
+ of_selftest_overlay_5();
+ of_selftest_overlay_6();
+ of_selftest_overlay_8();
+
+out:
+ of_node_put(bus_np);
+}
+
+#else
+static inline void __init of_selftest_overlay(void) { }
+#endif
+
static int __init of_selftest(void)
{
struct device_node *np;
@@ -537,6 +1017,7 @@ static int __init of_selftest(void)
of_selftest_parse_interrupts_extended();
of_selftest_match_node();
of_selftest_platform_populate();
+ of_selftest_overlay();
pr_info("end of selftest - %i passed, %i failed\n",
selftest_results.passed, selftest_results.failed);
return 0;
diff --git a/drivers/of/testcase-data/testcases.dtsi b/drivers/of/testcase-data/testcases.dtsi
index 6d8d980a..a54fd68 100644
--- a/drivers/of/testcase-data/testcases.dtsi
+++ b/drivers/of/testcase-data/testcases.dtsi
@@ -2,3 +2,4 @@
#include "tests-interrupts.dtsi"
#include "tests-match.dtsi"
#include "tests-platform.dtsi"
+#include "tests-overlay.dtsi"
diff --git a/drivers/of/testcase-data/tests-overlay.dtsi b/drivers/of/testcase-data/tests-overlay.dtsi
new file mode 100644
index 0000000..75976da
--- /dev/null
+++ b/drivers/of/testcase-data/tests-overlay.dtsi
@@ -0,0 +1,180 @@
+
+/ {
+ testcase-data {
+ overlay-node {
+
+ /* test bus */
+ selftestbus: test-bus {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ selftest100: test-selftest100 {
+ compatible = "selftest";
+ status = "okay";
+ reg = <100>;
+ };
+
+ selftest101: test-selftest101 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <101>;
+ };
+
+ selftest0: test-selftest0 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <0>;
+ };
+
+ selftest1: test-selftest1 {
+ compatible = "selftest";
+ status = "okay";
+ reg = <1>;
+ };
+
+ selftest2: test-selftest2 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <2>;
+ };
+
+ selftest3: test-selftest3 {
+ compatible = "selftest";
+ status = "okay";
+ reg = <3>;
+ };
+
+ selftest5: test-selftest5 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <5>;
+ };
+
+ selftest6: test-selftest6 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <6>;
+ };
+
+ selftest7: test-selftest7 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <7>;
+ };
+
+ selftest8: test-selftest8 {
+ compatible = "selftest";
+ status = "disabled";
+ reg = <8>;
+ };
+ };
+ };
+
+ /* test enable using absolute target path */
+ overlay0 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest0";
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+
+ /* test disable using absolute target path */
+ overlay1 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest1";
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+ };
+
+ /* test enable using label */
+ overlay2 {
+ fragment@0 {
+ target = <&selftest2>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+
+ /* test disable using label */
+ overlay3 {
+ fragment@0 {
+ target = <&selftest3>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+ };
+
+ /* test insertion of a full node */
+ overlay4 {
+ fragment@0 {
+ target = <&selftestbus>;
+ __overlay__ {
+
+ /* suppress DTC warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ test-selftest4 {
+ compatible = "selftest";
+ status = "okay";
+ reg = <4>;
+ };
+ };
+ };
+ };
+
+ /* test overlay apply revert */
+ overlay5 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest5";
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+
+ /* test overlays application and removal in sequence */
+ overlay6 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest6";
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+ overlay7 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest7";
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+
+ /* test overlays application and removal in bad sequence */
+ overlay8 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest8";
+ __overlay__ {
+ status = "okay";
+ };
+ };
+ };
+ overlay9 {
+ fragment@0 {
+ target-path = "/testcase-data/overlay-node/test-bus/test-selftest8";
+ __overlay__ {
+ property-foo = "bar";
+ };
+ };
+ };
+
+ };
+};
--
1.7.12
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