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Date: Mon, 24 Apr 2017 12:16:46 -0500
From: Rob Herring <robh+dt@...nel.org>
To: Frank Rowand <frowand.list@...il.com>
Cc: Stephen Boyd <stephen.boyd@...aro.org>,
Michal Marek <mmarek@...e.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/2] of: Add unit tests for applying overlays.
On Mon, Apr 24, 2017 at 12:43 AM, <frowand.list@...il.com> wrote:
> From: Frank Rowand <frank.rowand@...y.com>
>
> Existing overlay unit tests examine individual pieces of the overlay
> code. The new tests target the entire process of applying an overlay.
>
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
>
> There are checkpatch warnings. I have reviewed them and feel they
> can be ignored.
>
> drivers/of/fdt.c | 45 +++++
> drivers/of/of_private.h | 2 +
> drivers/of/unittest-data/Makefile | 17 +-
> drivers/of/unittest-data/ot.dts | 53 ++++++
> drivers/of/unittest-data/ot_bad_phandle.dts | 20 +++
> drivers/of/unittest-data/ot_base.dts | 71 ++++++++
> drivers/of/unittest.c | 264 ++++++++++++++++++++++++++++
> 7 files changed, 469 insertions(+), 3 deletions(-)
> create mode 100644 drivers/of/unittest-data/ot.dts
> create mode 100644 drivers/of/unittest-data/ot_bad_phandle.dts
> create mode 100644 drivers/of/unittest-data/ot_base.dts
ot? Overlay Test? That's not very obvious if so.
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index e5ce4b59e162..54120ab8f322 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -31,6 +31,8 @@
> #include <asm/setup.h> /* for COMMAND_LINE_SIZE */
> #include <asm/page.h>
>
> +#include "of_private.h"
> +
> /*
> * of_fdt_limit_memory - limit the number of regions in the /memory node
> * @limit: maximum entries
> @@ -1256,11 +1258,54 @@ bool __init early_init_dt_scan(void *params)
> */
> void __init unflatten_device_tree(void)
> {
> +#ifdef CONFIG_OF_UNITTEST
> + extern uint8_t __dtb_ot_base_begin[];
> + extern uint8_t __dtb_ot_base_end[];
> + struct device_node *ot_base_root;
> + void *ot_base;
> + u32 data_size;
> + u32 size;
> +#endif
> +
> __unflatten_device_tree(initial_boot_params, NULL, &of_root,
> early_init_dt_alloc_memory_arch, false);
>
> /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
> of_alias_scan(early_init_dt_alloc_memory_arch);
Just make __unflatten_device_tree accessible to the unit test code and
move all this to it. Then you don't need the ifdefery.
Does this need to be immediately after unflattening the base tree?
> +
> +#ifdef CONFIG_OF_UNITTEST
> + /*
> + * Base device tree for the overlay unittest.
> + * Do as much as possible the same way as done for the normal FDT.
> + * Have to stop before resolving phandles, because that uses kmalloc.
> + */
> +
> + data_size = __dtb_ot_base_end - __dtb_ot_base_begin;
> + if (!data_size) {
> + pr_err("No __dtb_ot_base_begin to attach\n");
> + return;
> + }
> +
> + size = fdt_totalsize(__dtb_ot_base_begin);
> + if (size != data_size) {
> + pr_err("__dtb_ot_base_begin header totalsize != actual size");
> + return;
> + }
> +
> + ot_base = early_init_dt_alloc_memory_arch(size,
> + roundup_pow_of_two(FDT_V17_SIZE));
> + if (!ot_base) {
> + pr_err("alloc of ot_base failed");
> + return;
> + }
> +
> + memcpy(ot_base, __dtb_ot_base_begin, size);
> +
> + __unflatten_device_tree(ot_base, NULL, &ot_base_root,
> + early_init_dt_alloc_memory_arch, true);
> +
> + unittest_set_ot_base_root(ot_base_root);
> +#endif
> }
>
> /**
> diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
> index f4f6793d2f04..02d54da078ac 100644
> --- a/drivers/of/of_private.h
> +++ b/drivers/of/of_private.h
> @@ -55,6 +55,8 @@ static inline int of_property_notify(int action, struct device_node *np,
> }
> #endif /* CONFIG_OF_DYNAMIC */
>
> +extern void unittest_set_ot_base_root(struct device_node *dn);
> +
> /**
> * General utilities for working with live trees.
> *
> diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
> index 1ac5cc01d627..6879befe29d2 100644
> --- a/drivers/of/unittest-data/Makefile
> +++ b/drivers/of/unittest-data/Makefile
> @@ -1,7 +1,18 @@
> obj-y += testcases.dtb.o
> +obj-y += ot.dtb.o
> +obj-y += ot_bad_phandle.dtb.o
> +obj-y += ot_base.dtb.o
>
> targets += testcases.dtb testcases.dtb.S
> +targets += ot.dtb ot.dtb.S
> +targets += ot_bad_phandle.dtb ot_bad_phandle.dtb.S
> +targets += ot_base.dtb ot_base.dtb.S
>
> -.SECONDARY: \
> - $(obj)/testcases.dtb.S \
> - $(obj)/testcases.dtb
> +.PRECIOUS: \
> + $(obj)/%.dtb.S \
> + $(obj)/%.dtb
> +
> +# enable creation of __symbols__ node
> +DTC_FLAGS_ot := -@
> +DTC_FLAGS_ot_base := -@
> +DTC_FLAGS_ot_bad_phandle := -@
> diff --git a/drivers/of/unittest-data/ot.dts b/drivers/of/unittest-data/ot.dts
> new file mode 100644
> index 000000000000..37e105622b7a
> --- /dev/null
> +++ b/drivers/of/unittest-data/ot.dts
> @@ -0,0 +1,53 @@
> +/dts-v1/;
> +/plugin/;
> +
> +/ {
> +
> + fragment@0 {
> + target = <&electric_1>;
> +
> + __overlay__ {
> + status = "ok";
> +
> + hvac_2: hvac_large_1 {
We should follow best practice here and not use '_' for node names. I
wonder what warnings dtc throws with W=2 for the unittests. Don't
think I tried that when adding them.
> + compatible = "ot,hvac-large";
> + heat-range = < 40 75 >;
> + cool-range = < 65 80 >;
> + };
> + };
> + };
> +
> + fragment@1 {
> + target = <&rides_1>;
> +
> + __overlay__ {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + status = "ok";
> +
> + ride@200 {
> + compatible = "ot,ferris-wheel";
> + reg = < 0x00000200 0x100 >;
> + hvac-provider = < &hvac_2 >;
> + hvac-thermostat = < 27 32 > ;
> + hvac-zones = < 12 5 >;
> + hvac-zone-names = "operator", "snack-bar";
> + spin-controller = < &spin_ctrl_1 3 >;
> + spin-rph = < 30 >;
> + gondolas = < 16 >;
> + gondola-capacity = < 6 >;
> + };
> + };
> + };
> +
> + fragment@2 {
> + target = <&lights_2>;
> +
> + __overlay__ {
> + status = "ok";
> + color = "purple", "white", "red", "green";
> + rate = < 3 256 >;
> + };
> + };
> +
> +};
> diff --git a/drivers/of/unittest-data/ot_bad_phandle.dts b/drivers/of/unittest-data/ot_bad_phandle.dts
> new file mode 100644
> index 000000000000..234d5f1dcfe4
> --- /dev/null
> +++ b/drivers/of/unittest-data/ot_bad_phandle.dts
> @@ -0,0 +1,20 @@
> +/dts-v1/;
> +/plugin/;
> +
> +/ {
> +
> + fragment@0 {
> + target = <&electric_1>;
> +
> + __overlay__ {
> +
> + // This label should cause an error when the overlay
> + // is applied. There is already a phandle value
> + // in the base tree for motor_1.
> + spin_ctrl_1_conflict: motor_1 {
> + accelerate = < 3 >;
> + decelerate = < 5 >;
> + };
> + };
> + };
> +};
> diff --git a/drivers/of/unittest-data/ot_base.dts b/drivers/of/unittest-data/ot_base.dts
> new file mode 100644
> index 000000000000..0a4fbe598b02
> --- /dev/null
> +++ b/drivers/of/unittest-data/ot_base.dts
> @@ -0,0 +1,71 @@
> +/dts-v1/;
> +/plugin/;
> +
> +/ {
> + testcase-data-2 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + electric_1: substation@100 {
> + compatible = "ot,big-volts-control";
> + reg = < 0x00000100 0x100 >;
> + status = "disabled";
> +
> + hvac_1: hvac_medium_1 {
> + compatible = "ot,hvac-medium";
> + heat-range = < 50 75 >;
> + cool-range = < 60 80 >;
> + };
> +
> + spin_ctrl_1: motor_1 {
> + compatible = "ot,ferris-wheel-motor";
> + spin = "clockwise";
> + };
> +
> + spin_ctrl_2: motor_8 {
> + compatible = "ot,roller-coaster-motor";
> + };
> + };
> +
> + rides_1: fairway_1 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "ot,rides";
> + status = "disabled";
> + orientation = < 127 >;
> +
> + ride@100 {
> + compatible = "ot,roller-coaster";
> + reg = < 0x00000100 0x100 >;
> + hvac-provider = < &hvac_1 >;
> + hvac-thermostat = < 29 > ;
> + hvac-zones = < 14 >;
> + hvac-zone-names = "operator";
> + spin-controller = < &spin_ctrl_2 5 &spin_ctrl_2 7 >;
> + spin-controller-names = "track_1", "track_2";
> + queues = < 2 >;
> + };
> + };
> +
> + lights_1: lights@...00 {
> + compatible = "ot,work-lights";
> + reg = < 0x00030000 0x1000 >;
> + status = "disabled";
> + };
> +
> + lights_2: lights@...00 {
> + compatible = "ot,show-lights";
> + reg = < 0x00040000 0x1000 >;
> + status = "disabled";
> + rate = < 13 138 >;
> + };
> +
> + retail_1: vending@...00 {
> + reg = < 0x00050000 0x1000 >;
> + compatible = "ot,tickets";
> + status = "disabled";
> + };
> +
> + };
> +};
> +
> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 62db55b97c10..599eb10e9b40 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -8,6 +8,7 @@
> #include <linux/err.h>
> #include <linux/errno.h>
> #include <linux/hashtable.h>
> +#include <linux/libfdt.h>
> #include <linux/of.h>
> #include <linux/of_fdt.h>
> #include <linux/of_irq.h>
> @@ -42,6 +43,13 @@
> failed; \
> })
>
> +static struct device_node *ot_base_root;
> +
> +void unittest_set_ot_base_root(struct device_node *dn)
> +{
> + ot_base_root = dn;
> +}
> +
> static void __init of_unittest_find_node_by_name(void)
> {
> struct device_node *np;
> @@ -1925,6 +1933,259 @@ static void __init of_unittest_overlay(void)
> static inline void __init of_unittest_overlay(void) { }
> #endif
>
> +#define OVERLAY_INFO_EXTERN(name) \
> + extern uint8_t __dtb_##name##_begin[]; \
> + extern uint8_t __dtb_##name##_end[]
> +
> +#define OVERLAY_INFO(name, expected) \
> +{ .dtb_begin = __dtb_##name##_begin, \
> + .dtb_end = __dtb_##name##_end, \
> + .expected_result = expected, \
> +}
> +
> +struct overlay_info {
> + uint8_t *dtb_begin;
> + uint8_t *dtb_end;
> + void *data;
> + struct device_node *np_overlay;
> + int expected_result;
> + int overlay_id;
> +};
> +
> +OVERLAY_INFO_EXTERN(ot);
> +OVERLAY_INFO_EXTERN(ot_bad_phandle);
> +
> +struct overlay_info overlays[] = {
> + OVERLAY_INFO(ot, 0),
> + OVERLAY_INFO(ot_bad_phandle, -EINVAL),
> + {}
> +};
> +
> +#ifdef CONFIG_OF_OVERLAY
> +/*
> + * The purpose of of_unittest_overlay_test_data_add is to add an
> + * overlay in the normal fashion. This is a test of the whole
> + * picture, instead of testing individual elements.
> + *
> + * A secondary purpose is to be able to verify that the contents of
> + * /proc/device-tree/ contains the updated structure and values from
> + * the overlay. That must be verified separately in user space.
> + *
> + * Return 0 on unexpected error.
> + */
> +static int __init overlay_test_data_add(int onum)
There's a need for a general function to apply built-in overlays
beyond just unittests. See
drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c. It's pretty close to the
same set of calls.
Rob
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