On 2023-02-03 at 18:06:51 +0100, Marco Pagani wrote:
> Add fake FPGA region platform driver with support functions. This
> module is part of the KUnit test suite for the FPGA subsystem.
>
> Signed-off-by: Marco Pagani <marpagan@xxxxxxxxxx>
> ---
> drivers/fpga/tests/fake-fpga-region.c | 186 ++++++++++++++++++++++++++
> drivers/fpga/tests/fake-fpga-region.h | 37 +++++
> 2 files changed, 223 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..095397e41837
> --- /dev/null
> +++ b/drivers/fpga/tests/fake-fpga-region.c
> @@ -0,0 +1,186 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for fake FPGA region
> + *
> + * Copyright (C) 2023 Red Hat, Inc. All rights reserved.
> + *
> + * Author: Marco Pagani <marpagan@xxxxxxxxxx>
> + */
> +
> +#include <linux/device.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 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.
> + * @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 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;
> + }
> +
> + 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;
> +
> + 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.
> + */
> +int fake_fpga_region_add_bridge(struct fake_fpga_region *region_ctx,
> + struct fpga_bridge *bridge)
> +{
> + struct fake_region_priv *priv;
> + int ret;
> +
> + priv = region_ctx->region->priv;
> +
> + ret = fpga_bridge_get_to_list(bridge->dev.parent, NULL,
> + ®ion_ctx->region->bridge_list);
> +
> + if (priv->test && !ret)
> + kunit_info(priv->test, "Bridge added to fake FPGA region %d\n",
> + priv->id);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(fake_fpga_region_add_bridge);
> +
> +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;
> + static int id_count;
> +
> + dev = &pdev->dev;
> + pdata = dev_get_platdata(dev);
> +
> + 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);
> +
> + /*
> + * No get_bridges() method since the bridges list is
> + * pre-built using fake_fpga_region_add_bridge()
> + */
This is not the common use for drivers to associate the region & bridge,
Better to realize the get_bridges() method.
Thanks,
Yilun
> + region = fpga_region_register(dev, mgr, NULL);
> + if (IS_ERR(region)) {
> + fpga_mgr_put(mgr);
> + return PTR_ERR(region);
> + }
> +
> + priv->test = pdata->test;
> + priv->id = id_count++;
> + region->priv = priv;
> +
> + platform_set_drvdata(pdev, region);
> +
> + return 0;
> +}
