diff mbox series

[RFC,v2,3/4] fpga: add fake FPGA region

Message ID 20230310170412.708363-4-marpagan@redhat.com (mailing list archive)
State New
Headers show
Series fpga: add initial KUnit tests for the subsystem | expand

Commit Message

Marco Pagani March 10, 2023, 5:04 p.m. UTC 
Add fake FPGA region platform driver with support functions. This
module is part of the KUnit tests for the FPGA subsystem.

Signed-off-by: Marco Pagani <marpagan@redhat.com>
---
 drivers/fpga/tests/fake-fpga-region.c | 219 ++++++++++++++++++++++++++
 drivers/fpga/tests/fake-fpga-region.h |  38 +++++
 2 files changed, 257 insertions(+)
 create mode 100644 drivers/fpga/tests/fake-fpga-region.c
 create mode 100644 drivers/fpga/tests/fake-fpga-region.h

Comments

Xu Yilun March 17, 2023, 10:40 a.m. UTC | #1 
On 2023-03-10 at 18:04:11 +0100, Marco Pagani wrote:
> Add fake FPGA region platform driver with support functions. This
> module is part of the KUnit tests for the FPGA subsystem.
> 
> Signed-off-by: Marco Pagani <marpagan@redhat.com>
> ---
>  drivers/fpga/tests/fake-fpga-region.c | 219 ++++++++++++++++++++++++++
>  drivers/fpga/tests/fake-fpga-region.h |  38 +++++
>  2 files changed, 257 insertions(+)
>  create mode 100644 drivers/fpga/tests/fake-fpga-region.c
>  create mode 100644 drivers/fpga/tests/fake-fpga-region.h
> 
> diff --git a/drivers/fpga/tests/fake-fpga-region.c b/drivers/fpga/tests/fake-fpga-region.c
> new file mode 100644
> index 000000000000..54d0e564728b
> --- /dev/null
> +++ b/drivers/fpga/tests/fake-fpga-region.c
> @@ -0,0 +1,219 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for the fake FPGA region
> + *
> + * Copyright (C) 2023 Red Hat, Inc.
> + *
> + * Author: Marco Pagani <marpagan@redhat.com>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/list.h>
> +#include <linux/platform_device.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/fpga/fpga-region.h>
> +#include <linux/fpga/fpga-bridge.h>
> +#include <kunit/test.h>
> +
> +#include "fake-fpga-region.h"
> +
> +#define FAKE_FPGA_REGION_DEV_NAME	"fake_fpga_region"
> +
> +struct fake_region_priv {
> +	int id;
> +	struct kunit *test;
> +	struct list_head bridge_list;
> +};
> +
> +struct fake_region_data {
> +	struct fpga_manager *mgr;
> +	struct kunit *test;
> +};
> +
> +/**
> + * fake_fpga_region_register() - register a fake FPGA region.
> + * @region_ctx: fake FPGA region context data structure.
> + * @mgr: associated FPGA manager.
> + * @parent: parent device.
> + * @test: KUnit test context object.
> + *
> + * Return: 0 if registration succeeded, an error code otherwise.
> + */
> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
> +			      struct fpga_manager *mgr, struct device *parent,
> +			      struct kunit *test)
> +{
> +	struct fake_region_data pdata;
> +	struct fake_region_priv *priv;
> +	int ret;
> +
> +	pdata.mgr = mgr;
> +	pdata.test = test;
> +
> +	region_ctx->pdev = platform_device_alloc(FAKE_FPGA_REGION_DEV_NAME,
> +						 PLATFORM_DEVID_AUTO);
> +	if (IS_ERR(region_ctx->pdev)) {
> +		pr_err("Fake FPGA region device allocation failed\n");
> +		return -ENOMEM;
> +	}
> +
> +	region_ctx->pdev->dev.parent = parent;
> +	platform_device_add_data(region_ctx->pdev, &pdata, sizeof(pdata));
> +
> +	ret = platform_device_add(region_ctx->pdev);
> +	if (ret) {
> +		pr_err("Fake FPGA region device add failed\n");
> +		platform_device_put(region_ctx->pdev);
> +		return ret;
> +	}
> +
> +	region_ctx->region = platform_get_drvdata(region_ctx->pdev);
> +
> +	if (test) {
> +		priv = region_ctx->region->priv;
> +		kunit_info(test, "Fake FPGA region %d registered\n", priv->id);
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(fake_fpga_region_register);
> +
> +/**
> + * fake_fpga_region_unregister() - unregister a fake FPGA region.
> + * @region_ctx: fake FPGA region context data structure.
> + */
> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx)
> +{
> +	struct fake_region_priv *priv;
> +	struct kunit *test;
> +	int id;
> +
> +	if (!region_ctx)
> +		return;
> +
> +	priv = region_ctx->region->priv;
> +	test = priv->test;
> +	id = priv->id;
> +
> +	if (region_ctx->pdev) {
> +		platform_device_unregister(region_ctx->pdev);
> +		if (test)
> +			kunit_info(test, "Fake FPGA region %d unregistered\n", id);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(fake_fpga_region_unregister);
> +
> +/**
> + * fake_fpga_region_add_bridge() - add a bridge to a fake FPGA region.
> + * @region_ctx: fake FPGA region context data structure.
> + * @bridge: FPGA bridge.
> + *
> + * Return: 0 if registration succeeded, an error code otherwise.
> + */
> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
> +				 struct fpga_bridge *bridge)
> +{
> +	struct fake_region_priv *priv;
> +
> +	priv = region_ctx->region->priv;
> +
> +	/* Add bridge to the list of bridges in the private context */
> +	list_add(&bridge->node, &priv->bridge_list);
> +
> +	if (priv->test)
> +		kunit_info(priv->test, "Bridge added to fake FPGA region %d\n",
> +			   priv->id);
> +}
> +EXPORT_SYMBOL_GPL(fake_fpga_region_add_bridge);
> +
> +static int fake_region_get_bridges(struct fpga_region *region)
> +{
> +	struct fake_region_priv *priv;
> +	struct fpga_bridge *bridge, *tmp;
> +	int ret;
> +
> +	priv = region->priv;
> +
> +	list_for_each_entry_safe(bridge, tmp, &priv->bridge_list, node) {
> +		list_del(&bridge->node);

I think the fake_fpga_region user just need to call
fake_fpga_region_add_bridge() once on init, and may call
fpga_bridges_put() at any time after fpga_region_program_fpga(), then
you may lose the track of the bridges, which breaks the next
fpga_region_program_fpga().

Thanks,
Yilun

> +		ret = fpga_bridge_get_to_list(bridge->dev.parent,
> +					      region->info,
> +					      &region->bridge_list);
> +		if (ret)
> +			break;
> +	}
> +
> +	return ret;
> +}
> +
> +static int fake_fpga_region_probe(struct platform_device *pdev)
> +{
> +	struct device *dev;
> +	struct fpga_region *region;
> +	struct fpga_manager *mgr;
> +	struct fake_region_data *pdata;
> +	struct fake_region_priv *priv;
> +	struct fpga_region_info info;
> +	static int id_count;
> +
> +	dev = &pdev->dev;
> +	pdata = dev_get_platdata(dev);
> +
> +	if (!pdata) {
> +		dev_err(&pdev->dev, "Missing platform data\n");
> +		return -EINVAL;
> +	}
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	mgr = fpga_mgr_get(pdata->mgr->dev.parent);
> +	if (IS_ERR(mgr))
> +		return PTR_ERR(mgr);
> +
> +	INIT_LIST_HEAD(&priv->bridge_list);
> +	priv->id = id_count++;
> +	priv->test = pdata->test;
> +
> +	memset(&info, 0, sizeof(info));
> +	info.priv = priv;
> +	info.mgr = mgr;
> +	info.get_bridges = fake_region_get_bridges;
> +
> +	region = fpga_region_register_full(dev, &info);
> +	if (IS_ERR(region)) {
> +		fpga_mgr_put(mgr);
> +		return PTR_ERR(region);
> +	}
> +
> +	platform_set_drvdata(pdev, region);
> +
> +	return 0;
> +}
> +
> +static int fake_fpga_region_remove(struct platform_device *pdev)
> +{
> +	struct fpga_region *region = platform_get_drvdata(pdev);
> +	struct fpga_manager *mgr = region->mgr;
> +
> +	fpga_mgr_put(mgr);
> +	fpga_bridges_put(&region->bridge_list);
> +	fpga_region_unregister(region);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver fake_fpga_region_drv = {
> +	.driver = {
> +		.name = FAKE_FPGA_REGION_DEV_NAME
> +	},
> +	.probe = fake_fpga_region_probe,
> +	.remove = fake_fpga_region_remove,
> +};
> +
> +module_platform_driver(fake_fpga_region_drv);
> +
> +MODULE_AUTHOR("Marco Pagani <marpagan@redhat.com>");
> +MODULE_DESCRIPTION("Fake FPGA Bridge");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/fpga/tests/fake-fpga-region.h b/drivers/fpga/tests/fake-fpga-region.h
> new file mode 100644
> index 000000000000..9268ca335662
> --- /dev/null
> +++ b/drivers/fpga/tests/fake-fpga-region.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Header file for the fake FPGA region
> + *
> + * Copyright (C) 2023 Red Hat, Inc.
> + *
> + * Author: Marco Pagani <marpagan@redhat.com>
> + */
> +
> +#ifndef __FPGA_FAKE_RGN_H
> +#define __FPGA_FAKE_RGN_H
> +
> +#include <linux/platform_device.h>
> +#include <kunit/test.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/fpga/fpga-bridge.h>
> +
> +/**
> + * struct fake_fpga_region - fake FPGA region context data structure
> + *
> + * @region: FPGA region.
> + * @pdev: platform device of the FPGA region.
> + */
> +struct fake_fpga_region {
> +	struct fpga_region *region;
> +	struct platform_device *pdev;
> +};
> +
> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
> +			      struct fpga_manager *mgr, struct device *parent,
> +			      struct kunit *test);
> +
> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
> +				 struct fpga_bridge *bridge);
> +
> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx);
> +
> +#endif /* __FPGA_FAKE_RGN_H */
> -- 
> 2.39.2
>
Marco Pagani March 21, 2023, 8:07 p.m. UTC | #2 
On 2023-03-17 11:40, Xu Yilun wrote:
> On 2023-03-10 at 18:04:11 +0100, Marco Pagani wrote:
>> Add fake FPGA region platform driver with support functions. This
>> module is part of the KUnit tests for the FPGA subsystem.
>>
>> Signed-off-by: Marco Pagani <marpagan@redhat.com>
>> ---
>>  drivers/fpga/tests/fake-fpga-region.c | 219 ++++++++++++++++++++++++++
>>  drivers/fpga/tests/fake-fpga-region.h |  38 +++++
>>  2 files changed, 257 insertions(+)
>>  create mode 100644 drivers/fpga/tests/fake-fpga-region.c
>>  create mode 100644 drivers/fpga/tests/fake-fpga-region.h
>>
>> diff --git a/drivers/fpga/tests/fake-fpga-region.c b/drivers/fpga/tests/fake-fpga-region.c
>> new file mode 100644
>> index 000000000000..54d0e564728b
>> --- /dev/null
>> +++ b/drivers/fpga/tests/fake-fpga-region.c
>> @@ -0,0 +1,219 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Driver for the fake FPGA region
>> + *
>> + * Copyright (C) 2023 Red Hat, Inc.
>> + *
>> + * Author: Marco Pagani <marpagan@redhat.com>
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/list.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/fpga/fpga-mgr.h>
>> +#include <linux/fpga/fpga-region.h>
>> +#include <linux/fpga/fpga-bridge.h>
>> +#include <kunit/test.h>
>> +
>> +#include "fake-fpga-region.h"
>> +
>> +#define FAKE_FPGA_REGION_DEV_NAME	"fake_fpga_region"
>> +
>> +struct fake_region_priv {
>> +	int id;
>> +	struct kunit *test;
>> +	struct list_head bridge_list;
>> +};
>> +
>> +struct fake_region_data {
>> +	struct fpga_manager *mgr;
>> +	struct kunit *test;
>> +};
>> +
>> +/**
>> + * fake_fpga_region_register() - register a fake FPGA region.
>> + * @region_ctx: fake FPGA region context data structure.
>> + * @mgr: associated FPGA manager.
>> + * @parent: parent device.
>> + * @test: KUnit test context object.
>> + *
>> + * Return: 0 if registration succeeded, an error code otherwise.
>> + */
>> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
>> +			      struct fpga_manager *mgr, struct device *parent,
>> +			      struct kunit *test)
>> +{
>> +	struct fake_region_data pdata;
>> +	struct fake_region_priv *priv;
>> +	int ret;
>> +
>> +	pdata.mgr = mgr;
>> +	pdata.test = test;
>> +
>> +	region_ctx->pdev = platform_device_alloc(FAKE_FPGA_REGION_DEV_NAME,
>> +						 PLATFORM_DEVID_AUTO);
>> +	if (IS_ERR(region_ctx->pdev)) {
>> +		pr_err("Fake FPGA region device allocation failed\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	region_ctx->pdev->dev.parent = parent;
>> +	platform_device_add_data(region_ctx->pdev, &pdata, sizeof(pdata));
>> +
>> +	ret = platform_device_add(region_ctx->pdev);
>> +	if (ret) {
>> +		pr_err("Fake FPGA region device add failed\n");
>> +		platform_device_put(region_ctx->pdev);
>> +		return ret;
>> +	}
>> +
>> +	region_ctx->region = platform_get_drvdata(region_ctx->pdev);
>> +
>> +	if (test) {
>> +		priv = region_ctx->region->priv;
>> +		kunit_info(test, "Fake FPGA region %d registered\n", priv->id);
>> +	}
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(fake_fpga_region_register);
>> +
>> +/**
>> + * fake_fpga_region_unregister() - unregister a fake FPGA region.
>> + * @region_ctx: fake FPGA region context data structure.
>> + */
>> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx)
>> +{
>> +	struct fake_region_priv *priv;
>> +	struct kunit *test;
>> +	int id;
>> +
>> +	if (!region_ctx)
>> +		return;
>> +
>> +	priv = region_ctx->region->priv;
>> +	test = priv->test;
>> +	id = priv->id;
>> +
>> +	if (region_ctx->pdev) {
>> +		platform_device_unregister(region_ctx->pdev);
>> +		if (test)
>> +			kunit_info(test, "Fake FPGA region %d unregistered\n", id);
>> +	}
>> +}
>> +EXPORT_SYMBOL_GPL(fake_fpga_region_unregister);
>> +
>> +/**
>> + * fake_fpga_region_add_bridge() - add a bridge to a fake FPGA region.
>> + * @region_ctx: fake FPGA region context data structure.
>> + * @bridge: FPGA bridge.
>> + *
>> + * Return: 0 if registration succeeded, an error code otherwise.
>> + */
>> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
>> +				 struct fpga_bridge *bridge)
>> +{
>> +	struct fake_region_priv *priv;
>> +
>> +	priv = region_ctx->region->priv;
>> +
>> +	/* Add bridge to the list of bridges in the private context */
>> +	list_add(&bridge->node, &priv->bridge_list);
>> +
>> +	if (priv->test)
>> +		kunit_info(priv->test, "Bridge added to fake FPGA region %d\n",
>> +			   priv->id);
>> +}
>> +EXPORT_SYMBOL_GPL(fake_fpga_region_add_bridge);
>> +
>> +static int fake_region_get_bridges(struct fpga_region *region)
>> +{
>> +	struct fake_region_priv *priv;
>> +	struct fpga_bridge *bridge, *tmp;
>> +	int ret;
>> +
>> +	priv = region->priv;
>> +
>> +	list_for_each_entry_safe(bridge, tmp, &priv->bridge_list, node) {
>> +		list_del(&bridge->node);
> 
> I think the fake_fpga_region user just need to call
> fake_fpga_region_add_bridge() once on init, and may call
> fpga_bridges_put() at any time after fpga_region_program_fpga(), then
> you may lose the track of the bridges, which breaks the next
> fpga_region_program_fpga().
> 
> Thanks,
> Yilun
>

That's right, fake_fpga_region_add_bridge() is intended to be called once
(for each bridge) just after registering the region. I should have added
this to the kernel-doc description of the function.

When a fake region is unregistered, its bridges are released using
fpga_bridges_put() by the remove method of the platform driver.

In the fpga_test_static_cfg test case, the base region is configured
twice. Then, when the base region is unregistered by the exit method of
the test suite, the base bridge is released.

Here's the raw test output with dev_dbg() prints of the FPGA bridge
enabled:

    # Subtest: fpga
    1..2
    # fpga_test_static_cfg: Fake FPGA manager: state
    # fpga_test_static_cfg: Fake FPGA manager registered
    # fpga_test_static_cfg: Fake FPGA bridge 3 registered
    # fpga_test_static_cfg: Fake FPGA region 0 registered
    # fpga_test_static_cfg: Bridge added to fake FPGA region 0
    # fpga_test_static_cfg: FPGA base system built
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
    # fpga_test_static_cfg: FPGA image allocated in a buffer, size: 16384
fpga_bridge br0: get <---
fpga_bridge br0: disable
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 0
    # fpga_test_static_cfg: Fake FPGA manager: parse_header
    # fpga_test_static_cfg: Fake FPGA manager: write_init
    # fpga_test_static_cfg: Fake FPGA manager: write
    # fpga_test_static_cfg: Fake FPGA manager: write_complete
fpga_bridge br0: enable
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 1
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
    # fpga_test_static_cfg: FPGA configuration completed using a buffer image
    # fpga_test_static_cfg: FPGA image allocated in a scatter gather table, size: 16384
fpga_bridge br0: disable
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 0
    # fpga_test_static_cfg: Fake FPGA manager: parse_header
    # fpga_test_static_cfg: Fake FPGA manager: write_init
    # fpga_test_static_cfg: Fake FPGA manager: write_sg
    # fpga_test_static_cfg: Fake FPGA manager: write_complete
fpga_bridge br0: enable
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 1
    # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
    # fpga_test_static_cfg: FPGA configuration completed using scatter gather table image
fpga_bridge br0: put <---
    # fpga_test_static_cfg: Fake FPGA region 0 unregistered
    # fpga_test_static_cfg: Fake FPGA bridge: remove
    # fpga_test_static_cfg: Fake FPGA bridge 3 unregistered
fpga_manager fpga0: fpga_mgr_unregister Fake FPGA Manager
    # fpga_test_static_cfg: Fake FPGA manager: remove
    # fpga_test_static_cfg: Fake FPGA manager unregistered
    ok 1 fpga_test_static_cfg

In my understanding, of-region uses a similar approach by releasing
bridges only when the overlay is removed.


>> +		ret = fpga_bridge_get_to_list(bridge->dev.parent,
>> +					      region->info,
>> +					      &region->bridge_list);
>> +		if (ret)
>> +			break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int fake_fpga_region_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev;
>> +	struct fpga_region *region;
>> +	struct fpga_manager *mgr;
>> +	struct fake_region_data *pdata;
>> +	struct fake_region_priv *priv;
>> +	struct fpga_region_info info;
>> +	static int id_count;
>> +
>> +	dev = &pdev->dev;
>> +	pdata = dev_get_platdata(dev);
>> +
>> +	if (!pdata) {
>> +		dev_err(&pdev->dev, "Missing platform data\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>> +	if (!priv)
>> +		return -ENOMEM;
>> +
>> +	mgr = fpga_mgr_get(pdata->mgr->dev.parent);
>> +	if (IS_ERR(mgr))
>> +		return PTR_ERR(mgr);
>> +
>> +	INIT_LIST_HEAD(&priv->bridge_list);
>> +	priv->id = id_count++;
>> +	priv->test = pdata->test;
>> +
>> +	memset(&info, 0, sizeof(info));
>> +	info.priv = priv;
>> +	info.mgr = mgr;
>> +	info.get_bridges = fake_region_get_bridges;
>> +
>> +	region = fpga_region_register_full(dev, &info);
>> +	if (IS_ERR(region)) {
>> +		fpga_mgr_put(mgr);
>> +		return PTR_ERR(region);
>> +	}
>> +
>> +	platform_set_drvdata(pdev, region);
>> +
>> +	return 0;
>> +}
>> +
>> +static int fake_fpga_region_remove(struct platform_device *pdev)
>> +{
>> +	struct fpga_region *region = platform_get_drvdata(pdev);
>> +	struct fpga_manager *mgr = region->mgr;
>> +
>> +	fpga_mgr_put(mgr);
>> +	fpga_bridges_put(&region->bridge_list);
>> +	fpga_region_unregister(region);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct platform_driver fake_fpga_region_drv = {
>> +	.driver = {
>> +		.name = FAKE_FPGA_REGION_DEV_NAME
>> +	},
>> +	.probe = fake_fpga_region_probe,
>> +	.remove = fake_fpga_region_remove,
>> +};
>> +
>> +module_platform_driver(fake_fpga_region_drv);
>> +
>> +MODULE_AUTHOR("Marco Pagani <marpagan@redhat.com>");
>> +MODULE_DESCRIPTION("Fake FPGA Bridge");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/fpga/tests/fake-fpga-region.h b/drivers/fpga/tests/fake-fpga-region.h
>> new file mode 100644
>> index 000000000000..9268ca335662
>> --- /dev/null
>> +++ b/drivers/fpga/tests/fake-fpga-region.h
>> @@ -0,0 +1,38 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Header file for the fake FPGA region
>> + *
>> + * Copyright (C) 2023 Red Hat, Inc.
>> + *
>> + * Author: Marco Pagani <marpagan@redhat.com>
>> + */
>> +
>> +#ifndef __FPGA_FAKE_RGN_H
>> +#define __FPGA_FAKE_RGN_H
>> +
>> +#include <linux/platform_device.h>
>> +#include <kunit/test.h>
>> +#include <linux/fpga/fpga-mgr.h>
>> +#include <linux/fpga/fpga-bridge.h>
>> +
>> +/**
>> + * struct fake_fpga_region - fake FPGA region context data structure
>> + *
>> + * @region: FPGA region.
>> + * @pdev: platform device of the FPGA region.
>> + */
>> +struct fake_fpga_region {
>> +	struct fpga_region *region;
>> +	struct platform_device *pdev;
>> +};
>> +
>> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
>> +			      struct fpga_manager *mgr, struct device *parent,
>> +			      struct kunit *test);
>> +
>> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
>> +				 struct fpga_bridge *bridge);
>> +
>> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx);
>> +
>> +#endif /* __FPGA_FAKE_RGN_H */
>> -- 
>> 2.39.2
>>
> 

Thanks,
Marco
Xu Yilun March 25, 2023, 7:11 a.m. UTC | #3 
On 2023-03-21 at 21:07:43 +0100, Marco Pagani wrote:
> 
> 
> On 2023-03-17 11:40, Xu Yilun wrote:
> > On 2023-03-10 at 18:04:11 +0100, Marco Pagani wrote:
> >> Add fake FPGA region platform driver with support functions. This
> >> module is part of the KUnit tests for the FPGA subsystem.
> >>
> >> Signed-off-by: Marco Pagani <marpagan@redhat.com>
> >> ---
> >>  drivers/fpga/tests/fake-fpga-region.c | 219 ++++++++++++++++++++++++++
> >>  drivers/fpga/tests/fake-fpga-region.h |  38 +++++
> >>  2 files changed, 257 insertions(+)
> >>  create mode 100644 drivers/fpga/tests/fake-fpga-region.c
> >>  create mode 100644 drivers/fpga/tests/fake-fpga-region.h
> >>
> >> diff --git a/drivers/fpga/tests/fake-fpga-region.c b/drivers/fpga/tests/fake-fpga-region.c
> >> new file mode 100644
> >> index 000000000000..54d0e564728b
> >> --- /dev/null
> >> +++ b/drivers/fpga/tests/fake-fpga-region.c
> >> @@ -0,0 +1,219 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * Driver for the fake FPGA region
> >> + *
> >> + * Copyright (C) 2023 Red Hat, Inc.
> >> + *
> >> + * Author: Marco Pagani <marpagan@redhat.com>
> >> + */
> >> +
> >> +#include <linux/device.h>
> >> +#include <linux/list.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/fpga/fpga-mgr.h>
> >> +#include <linux/fpga/fpga-region.h>
> >> +#include <linux/fpga/fpga-bridge.h>
> >> +#include <kunit/test.h>
> >> +
> >> +#include "fake-fpga-region.h"
> >> +
> >> +#define FAKE_FPGA_REGION_DEV_NAME	"fake_fpga_region"
> >> +
> >> +struct fake_region_priv {
> >> +	int id;
> >> +	struct kunit *test;
> >> +	struct list_head bridge_list;
> >> +};
> >> +
> >> +struct fake_region_data {
> >> +	struct fpga_manager *mgr;
> >> +	struct kunit *test;
> >> +};
> >> +
> >> +/**
> >> + * fake_fpga_region_register() - register a fake FPGA region.
> >> + * @region_ctx: fake FPGA region context data structure.
> >> + * @mgr: associated FPGA manager.
> >> + * @parent: parent device.
> >> + * @test: KUnit test context object.
> >> + *
> >> + * Return: 0 if registration succeeded, an error code otherwise.
> >> + */
> >> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
> >> +			      struct fpga_manager *mgr, struct device *parent,
> >> +			      struct kunit *test)
> >> +{
> >> +	struct fake_region_data pdata;
> >> +	struct fake_region_priv *priv;
> >> +	int ret;
> >> +
> >> +	pdata.mgr = mgr;
> >> +	pdata.test = test;
> >> +
> >> +	region_ctx->pdev = platform_device_alloc(FAKE_FPGA_REGION_DEV_NAME,
> >> +						 PLATFORM_DEVID_AUTO);
> >> +	if (IS_ERR(region_ctx->pdev)) {
> >> +		pr_err("Fake FPGA region device allocation failed\n");
> >> +		return -ENOMEM;
> >> +	}
> >> +
> >> +	region_ctx->pdev->dev.parent = parent;
> >> +	platform_device_add_data(region_ctx->pdev, &pdata, sizeof(pdata));
> >> +
> >> +	ret = platform_device_add(region_ctx->pdev);
> >> +	if (ret) {
> >> +		pr_err("Fake FPGA region device add failed\n");
> >> +		platform_device_put(region_ctx->pdev);
> >> +		return ret;
> >> +	}
> >> +
> >> +	region_ctx->region = platform_get_drvdata(region_ctx->pdev);
> >> +
> >> +	if (test) {
> >> +		priv = region_ctx->region->priv;
> >> +		kunit_info(test, "Fake FPGA region %d registered\n", priv->id);
> >> +	}
> >> +
> >> +	return 0;
> >> +}
> >> +EXPORT_SYMBOL_GPL(fake_fpga_region_register);
> >> +
> >> +/**
> >> + * fake_fpga_region_unregister() - unregister a fake FPGA region.
> >> + * @region_ctx: fake FPGA region context data structure.
> >> + */
> >> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx)
> >> +{
> >> +	struct fake_region_priv *priv;
> >> +	struct kunit *test;
> >> +	int id;
> >> +
> >> +	if (!region_ctx)
> >> +		return;
> >> +
> >> +	priv = region_ctx->region->priv;
> >> +	test = priv->test;
> >> +	id = priv->id;
> >> +
> >> +	if (region_ctx->pdev) {
> >> +		platform_device_unregister(region_ctx->pdev);
> >> +		if (test)
> >> +			kunit_info(test, "Fake FPGA region %d unregistered\n", id);
> >> +	}
> >> +}
> >> +EXPORT_SYMBOL_GPL(fake_fpga_region_unregister);
> >> +
> >> +/**
> >> + * fake_fpga_region_add_bridge() - add a bridge to a fake FPGA region.
> >> + * @region_ctx: fake FPGA region context data structure.
> >> + * @bridge: FPGA bridge.
> >> + *
> >> + * Return: 0 if registration succeeded, an error code otherwise.
> >> + */
> >> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
> >> +				 struct fpga_bridge *bridge)
> >> +{
> >> +	struct fake_region_priv *priv;
> >> +
> >> +	priv = region_ctx->region->priv;
> >> +
> >> +	/* Add bridge to the list of bridges in the private context */
> >> +	list_add(&bridge->node, &priv->bridge_list);
> >> +
> >> +	if (priv->test)
> >> +		kunit_info(priv->test, "Bridge added to fake FPGA region %d\n",
> >> +			   priv->id);
> >> +}
> >> +EXPORT_SYMBOL_GPL(fake_fpga_region_add_bridge);
> >> +
> >> +static int fake_region_get_bridges(struct fpga_region *region)
> >> +{
> >> +	struct fake_region_priv *priv;
> >> +	struct fpga_bridge *bridge, *tmp;
> >> +	int ret;
> >> +
> >> +	priv = region->priv;
> >> +
> >> +	list_for_each_entry_safe(bridge, tmp, &priv->bridge_list, node) {
> >> +		list_del(&bridge->node);
> > 
> > I think the fake_fpga_region user just need to call
> > fake_fpga_region_add_bridge() once on init, and may call
> > fpga_bridges_put() at any time after fpga_region_program_fpga(), then
> > you may lose the track of the bridges, which breaks the next
> > fpga_region_program_fpga().
> > 
> > Thanks,
> > Yilun
> >
> 
> That's right, fake_fpga_region_add_bridge() is intended to be called once
> (for each bridge) just after registering the region. I should have added
> this to the kernel-doc description of the function.
> 
> When a fake region is unregistered, its bridges are released using
> fpga_bridges_put() by the remove method of the platform driver.

Please check the kernel-doc:

/**
 * fpga_region_program_fpga - program FPGA
 *
 * @region: FPGA region
 *
 * Program an FPGA using fpga image info (region->info).
 * If the region has a get_bridges function, the exclusive reference for the
 * bridges will be held if programming succeeds.  This is intended to prevent
 * reprogramming the region until the caller considers it safe to do so.
 * The caller will need to call fpga_bridges_put() before attempting to
 * reprogram the region.
 *
 * Return 0 for success or negative error code.
 */
int fpga_region_program_fpga(struct fpga_region *region)

That means the fpga test should call fpga_bridges_put() before a second
fpga_region_program_fpga().

> 
> In the fpga_test_static_cfg test case, the base region is configured
> twice. Then, when the base region is unregistered by the exit method of
> the test suite, the base bridge is released.
> 
> Here's the raw test output with dev_dbg() prints of the FPGA bridge
> enabled:
> 
>     # Subtest: fpga
>     1..2
>     # fpga_test_static_cfg: Fake FPGA manager: state
>     # fpga_test_static_cfg: Fake FPGA manager registered
>     # fpga_test_static_cfg: Fake FPGA bridge 3 registered
>     # fpga_test_static_cfg: Fake FPGA region 0 registered
>     # fpga_test_static_cfg: Bridge added to fake FPGA region 0
>     # fpga_test_static_cfg: FPGA base system built
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
>     # fpga_test_static_cfg: FPGA image allocated in a buffer, size: 16384
> fpga_bridge br0: get <---
> fpga_bridge br0: disable
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 0
>     # fpga_test_static_cfg: Fake FPGA manager: parse_header
>     # fpga_test_static_cfg: Fake FPGA manager: write_init
>     # fpga_test_static_cfg: Fake FPGA manager: write
>     # fpga_test_static_cfg: Fake FPGA manager: write_complete
> fpga_bridge br0: enable
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 1
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
>     # fpga_test_static_cfg: FPGA configuration completed using a buffer image
>     # fpga_test_static_cfg: FPGA image allocated in a scatter gather table, size: 16384
> fpga_bridge br0: disable
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 0
>     # fpga_test_static_cfg: Fake FPGA manager: parse_header
>     # fpga_test_static_cfg: Fake FPGA manager: write_init
>     # fpga_test_static_cfg: Fake FPGA manager: write_sg
>     # fpga_test_static_cfg: Fake FPGA manager: write_complete
> fpga_bridge br0: enable
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_set: 1
>     # fpga_test_static_cfg: Fake FPGA bridge 3: enable_show
>     # fpga_test_static_cfg: FPGA configuration completed using scatter gather table image
> fpga_bridge br0: put <---
>     # fpga_test_static_cfg: Fake FPGA region 0 unregistered
>     # fpga_test_static_cfg: Fake FPGA bridge: remove
>     # fpga_test_static_cfg: Fake FPGA bridge 3 unregistered
> fpga_manager fpga0: fpga_mgr_unregister Fake FPGA Manager
>     # fpga_test_static_cfg: Fake FPGA manager: remove
>     # fpga_test_static_cfg: Fake FPGA manager unregistered
>     ok 1 fpga_test_static_cfg
> 
> In my understanding, of-region uses a similar approach by releasing
> bridges only when the overlay is removed.

The overlay removal is not equal to the of-fpga-region removal. Actually
the overlay could be applied & removed multiple times, and
fpga_region_program_fpga & fpga_bridges_put() are called each time.


Thanks,
Yilun

> 
> 
> >> +		ret = fpga_bridge_get_to_list(bridge->dev.parent,
> >> +					      region->info,
> >> +					      &region->bridge_list);
> >> +		if (ret)
> >> +			break;
> >> +	}
> >> +
> >> +	return ret;
> >> +}
> >> +
> >> +static int fake_fpga_region_probe(struct platform_device *pdev)
> >> +{
> >> +	struct device *dev;
> >> +	struct fpga_region *region;
> >> +	struct fpga_manager *mgr;
> >> +	struct fake_region_data *pdata;
> >> +	struct fake_region_priv *priv;
> >> +	struct fpga_region_info info;
> >> +	static int id_count;
> >> +
> >> +	dev = &pdev->dev;
> >> +	pdata = dev_get_platdata(dev);
> >> +
> >> +	if (!pdata) {
> >> +		dev_err(&pdev->dev, "Missing platform data\n");
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> >> +	if (!priv)
> >> +		return -ENOMEM;
> >> +
> >> +	mgr = fpga_mgr_get(pdata->mgr->dev.parent);
> >> +	if (IS_ERR(mgr))
> >> +		return PTR_ERR(mgr);
> >> +
> >> +	INIT_LIST_HEAD(&priv->bridge_list);
> >> +	priv->id = id_count++;
> >> +	priv->test = pdata->test;
> >> +
> >> +	memset(&info, 0, sizeof(info));
> >> +	info.priv = priv;
> >> +	info.mgr = mgr;
> >> +	info.get_bridges = fake_region_get_bridges;
> >> +
> >> +	region = fpga_region_register_full(dev, &info);
> >> +	if (IS_ERR(region)) {
> >> +		fpga_mgr_put(mgr);
> >> +		return PTR_ERR(region);
> >> +	}
> >> +
> >> +	platform_set_drvdata(pdev, region);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static int fake_fpga_region_remove(struct platform_device *pdev)
> >> +{
> >> +	struct fpga_region *region = platform_get_drvdata(pdev);
> >> +	struct fpga_manager *mgr = region->mgr;
> >> +
> >> +	fpga_mgr_put(mgr);
> >> +	fpga_bridges_put(&region->bridge_list);
> >> +	fpga_region_unregister(region);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static struct platform_driver fake_fpga_region_drv = {
> >> +	.driver = {
> >> +		.name = FAKE_FPGA_REGION_DEV_NAME
> >> +	},
> >> +	.probe = fake_fpga_region_probe,
> >> +	.remove = fake_fpga_region_remove,
> >> +};
> >> +
> >> +module_platform_driver(fake_fpga_region_drv);
> >> +
> >> +MODULE_AUTHOR("Marco Pagani <marpagan@redhat.com>");
> >> +MODULE_DESCRIPTION("Fake FPGA Bridge");
> >> +MODULE_LICENSE("GPL v2");
> >> diff --git a/drivers/fpga/tests/fake-fpga-region.h b/drivers/fpga/tests/fake-fpga-region.h
> >> new file mode 100644
> >> index 000000000000..9268ca335662
> >> --- /dev/null
> >> +++ b/drivers/fpga/tests/fake-fpga-region.h
> >> @@ -0,0 +1,38 @@
> >> +/* SPDX-License-Identifier: GPL-2.0 */
> >> +/*
> >> + * Header file for the fake FPGA region
> >> + *
> >> + * Copyright (C) 2023 Red Hat, Inc.
> >> + *
> >> + * Author: Marco Pagani <marpagan@redhat.com>
> >> + */
> >> +
> >> +#ifndef __FPGA_FAKE_RGN_H
> >> +#define __FPGA_FAKE_RGN_H
> >> +
> >> +#include <linux/platform_device.h>
> >> +#include <kunit/test.h>
> >> +#include <linux/fpga/fpga-mgr.h>
> >> +#include <linux/fpga/fpga-bridge.h>
> >> +
> >> +/**
> >> + * struct fake_fpga_region - fake FPGA region context data structure
> >> + *
> >> + * @region: FPGA region.
> >> + * @pdev: platform device of the FPGA region.
> >> + */
> >> +struct fake_fpga_region {
> >> +	struct fpga_region *region;
> >> +	struct platform_device *pdev;
> >> +};
> >> +
> >> +int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
> >> +			      struct fpga_manager *mgr, struct device *parent,
> >> +			      struct kunit *test);
> >> +
> >> +void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
> >> +				 struct fpga_bridge *bridge);
> >> +
> >> +void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx);
> >> +
> >> +#endif /* __FPGA_FAKE_RGN_H */
> >> -- 
> >> 2.39.2
> >>
> > 
> 
> Thanks,
> Marco
>
diff mbox series

Patch

diff --git a/drivers/fpga/tests/fake-fpga-region.c b/drivers/fpga/tests/fake-fpga-region.c
new file mode 100644
index 000000000000..54d0e564728b
--- /dev/null
+++ b/drivers/fpga/tests/fake-fpga-region.c
@@ -0,0 +1,219 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the fake FPGA region
+ *
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * Author: Marco Pagani <marpagan@redhat.com>
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/fpga/fpga-region.h>
+#include <linux/fpga/fpga-bridge.h>
+#include <kunit/test.h>
+
+#include "fake-fpga-region.h"
+
+#define FAKE_FPGA_REGION_DEV_NAME	"fake_fpga_region"
+
+struct fake_region_priv {
+	int id;
+	struct kunit *test;
+	struct list_head bridge_list;
+};
+
+struct fake_region_data {
+	struct fpga_manager *mgr;
+	struct kunit *test;
+};
+
+/**
+ * fake_fpga_region_register() - register a fake FPGA region.
+ * @region_ctx: fake FPGA region context data structure.
+ * @mgr: associated FPGA manager.
+ * @parent: parent device.
+ * @test: KUnit test context object.
+ *
+ * Return: 0 if registration succeeded, an error code otherwise.
+ */
+int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
+			      struct fpga_manager *mgr, struct device *parent,
+			      struct kunit *test)
+{
+	struct fake_region_data pdata;
+	struct fake_region_priv *priv;
+	int ret;
+
+	pdata.mgr = mgr;
+	pdata.test = test;
+
+	region_ctx->pdev = platform_device_alloc(FAKE_FPGA_REGION_DEV_NAME,
+						 PLATFORM_DEVID_AUTO);
+	if (IS_ERR(region_ctx->pdev)) {
+		pr_err("Fake FPGA region device allocation failed\n");
+		return -ENOMEM;
+	}
+
+	region_ctx->pdev->dev.parent = parent;
+	platform_device_add_data(region_ctx->pdev, &pdata, sizeof(pdata));
+
+	ret = platform_device_add(region_ctx->pdev);
+	if (ret) {
+		pr_err("Fake FPGA region device add failed\n");
+		platform_device_put(region_ctx->pdev);
+		return ret;
+	}
+
+	region_ctx->region = platform_get_drvdata(region_ctx->pdev);
+
+	if (test) {
+		priv = region_ctx->region->priv;
+		kunit_info(test, "Fake FPGA region %d registered\n", priv->id);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fake_fpga_region_register);
+
+/**
+ * fake_fpga_region_unregister() - unregister a fake FPGA region.
+ * @region_ctx: fake FPGA region context data structure.
+ */
+void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx)
+{
+	struct fake_region_priv *priv;
+	struct kunit *test;
+	int id;
+
+	if (!region_ctx)
+		return;
+
+	priv = region_ctx->region->priv;
+	test = priv->test;
+	id = priv->id;
+
+	if (region_ctx->pdev) {
+		platform_device_unregister(region_ctx->pdev);
+		if (test)
+			kunit_info(test, "Fake FPGA region %d unregistered\n", id);
+	}
+}
+EXPORT_SYMBOL_GPL(fake_fpga_region_unregister);
+
+/**
+ * fake_fpga_region_add_bridge() - add a bridge to a fake FPGA region.
+ * @region_ctx: fake FPGA region context data structure.
+ * @bridge: FPGA bridge.
+ *
+ * Return: 0 if registration succeeded, an error code otherwise.
+ */
+void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
+				 struct fpga_bridge *bridge)
+{
+	struct fake_region_priv *priv;
+
+	priv = region_ctx->region->priv;
+
+	/* Add bridge to the list of bridges in the private context */
+	list_add(&bridge->node, &priv->bridge_list);
+
+	if (priv->test)
+		kunit_info(priv->test, "Bridge added to fake FPGA region %d\n",
+			   priv->id);
+}
+EXPORT_SYMBOL_GPL(fake_fpga_region_add_bridge);
+
+static int fake_region_get_bridges(struct fpga_region *region)
+{
+	struct fake_region_priv *priv;
+	struct fpga_bridge *bridge, *tmp;
+	int ret;
+
+	priv = region->priv;
+
+	list_for_each_entry_safe(bridge, tmp, &priv->bridge_list, node) {
+		list_del(&bridge->node);
+		ret = fpga_bridge_get_to_list(bridge->dev.parent,
+					      region->info,
+					      &region->bridge_list);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int fake_fpga_region_probe(struct platform_device *pdev)
+{
+	struct device *dev;
+	struct fpga_region *region;
+	struct fpga_manager *mgr;
+	struct fake_region_data *pdata;
+	struct fake_region_priv *priv;
+	struct fpga_region_info info;
+	static int id_count;
+
+	dev = &pdev->dev;
+	pdata = dev_get_platdata(dev);
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "Missing platform data\n");
+		return -EINVAL;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	mgr = fpga_mgr_get(pdata->mgr->dev.parent);
+	if (IS_ERR(mgr))
+		return PTR_ERR(mgr);
+
+	INIT_LIST_HEAD(&priv->bridge_list);
+	priv->id = id_count++;
+	priv->test = pdata->test;
+
+	memset(&info, 0, sizeof(info));
+	info.priv = priv;
+	info.mgr = mgr;
+	info.get_bridges = fake_region_get_bridges;
+
+	region = fpga_region_register_full(dev, &info);
+	if (IS_ERR(region)) {
+		fpga_mgr_put(mgr);
+		return PTR_ERR(region);
+	}
+
+	platform_set_drvdata(pdev, region);
+
+	return 0;
+}
+
+static int fake_fpga_region_remove(struct platform_device *pdev)
+{
+	struct fpga_region *region = platform_get_drvdata(pdev);
+	struct fpga_manager *mgr = region->mgr;
+
+	fpga_mgr_put(mgr);
+	fpga_bridges_put(&region->bridge_list);
+	fpga_region_unregister(region);
+
+	return 0;
+}
+
+static struct platform_driver fake_fpga_region_drv = {
+	.driver = {
+		.name = FAKE_FPGA_REGION_DEV_NAME
+	},
+	.probe = fake_fpga_region_probe,
+	.remove = fake_fpga_region_remove,
+};
+
+module_platform_driver(fake_fpga_region_drv);
+
+MODULE_AUTHOR("Marco Pagani <marpagan@redhat.com>");
+MODULE_DESCRIPTION("Fake FPGA Bridge");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/fpga/tests/fake-fpga-region.h b/drivers/fpga/tests/fake-fpga-region.h
new file mode 100644
index 000000000000..9268ca335662
--- /dev/null
+++ b/drivers/fpga/tests/fake-fpga-region.h
@@ -0,0 +1,38 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header file for the fake FPGA region
+ *
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * Author: Marco Pagani <marpagan@redhat.com>
+ */
+
+#ifndef __FPGA_FAKE_RGN_H
+#define __FPGA_FAKE_RGN_H
+
+#include <linux/platform_device.h>
+#include <kunit/test.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/fpga/fpga-bridge.h>
+
+/**
+ * struct fake_fpga_region - fake FPGA region context data structure
+ *
+ * @region: FPGA region.
+ * @pdev: platform device of the FPGA region.
+ */
+struct fake_fpga_region {
+	struct fpga_region *region;
+	struct platform_device *pdev;
+};
+
+int fake_fpga_region_register(struct fake_fpga_region *region_ctx,
+			      struct fpga_manager *mgr, struct device *parent,
+			      struct kunit *test);
+
+void fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
+				 struct fpga_bridge *bridge);
+
+void fake_fpga_region_unregister(struct fake_fpga_region *region_ctx);
+
+#endif /* __FPGA_FAKE_RGN_H */