From nobody Tue Feb 10 23:11:56 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8988EC7EE22 for ; Thu, 11 May 2023 14:20:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238292AbjEKOU6 (ORCPT ); Thu, 11 May 2023 10:20:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238169AbjEKOUs (ORCPT ); Thu, 11 May 2023 10:20:48 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6291C1BFF for ; Thu, 11 May 2023 07:20:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1683814799; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=y7yrARP0OaOnDRJGgagTj/prTEpIs9t+1o9Qdk5PnIg=; b=YEa2O6t3RL2YJIKfqBmu9DwNFsdG8Y7pRW0/6XO2IY5Su8/vNuiRP0YEE9gP76zkaoHG9Q cVQpJ9QJ955eR4sEUwHgDVkQIU7QPO4TuhlktXws3lKfbWvqYV9bZwCWkcHn8oc0UNd3kq /TWTR9URPf98e5tqw7M1nm0Ypm5G41c= Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-652-7WMy54S9OeiM798loCMD2Q-1; Thu, 11 May 2023 10:19:58 -0400 X-MC-Unique: 7WMy54S9OeiM798loCMD2Q-1 Received: by mail-qt1-f199.google.com with SMTP id d75a77b69052e-3f4e2e7c742so13076111cf.0 for ; Thu, 11 May 2023 07:19:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683814798; x=1686406798; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=y7yrARP0OaOnDRJGgagTj/prTEpIs9t+1o9Qdk5PnIg=; b=f0MtOld9jnL22r64blX8kQXscFUW5X7PSYY0st4DpQKyTXpRRWQOhaId3w2FQ3ARgo /nxDi9lMdTBM2E7tXcv21rnQgXUv2mLBnzsU+NtwbgzSXZ6XGO8jN4RAbxcSBacjhSb2 eCwhpaZsKjB5IF57V0L+26P8hYMnXe+mHJ4JEmwIl+8otEMyB+0MDZ1OKxeGIf16ntae uC5z3jdfJuOwEO7jqBm3l9lWxunBEkvWgTdfQSwltsTWXgRtJwgGr9+NL26SzGAMb1Yp b5hMzOgeFLe7l7GeNzWZ2k++YSBWbQocc882GoNAlya5tqyhSbD9BrqpdoDleBQWUj4c KoxA== X-Gm-Message-State: AC+VfDw39iEvaSwHCMdrOeqFtPUo0Hi3EMtcXdVJR1d+Ce9S/q39MJKQ afG3rBwzV3piYBl2Vnnc0OqGQuUAzBOtkrZObH1jH3vr4IwqKzEkfPG0qeLpERhIhHJnzvelvy0 VstBffL1JjOZoackafnhLvp8= X-Received: by 2002:a05:622a:651:b0:3f3:8f4a:a5e1 with SMTP id a17-20020a05622a065100b003f38f4aa5e1mr22159272qtb.19.1683814798090; Thu, 11 May 2023 07:19:58 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5v5fa81D4Bi+Q+dtmG0kwAX1l9T0KPFKUGBDlDmc5hkH/928w5eIdxzLDHy9uqFl5EJf5x/A== X-Received: by 2002:a05:622a:651:b0:3f3:8f4a:a5e1 with SMTP id a17-20020a05622a065100b003f38f4aa5e1mr22159231qtb.19.1683814797771; Thu, 11 May 2023 07:19:57 -0700 (PDT) Received: from klayman.redhat.com (net-2-34-28-169.cust.vodafonedsl.it. [2.34.28.169]) by smtp.gmail.com with ESMTPSA id oo11-20020a05620a530b00b0074db94ed42fsm965516qkn.116.2023.05.11.07.19.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 May 2023 07:19:57 -0700 (PDT) From: Marco Pagani To: Moritz Fischer , Wu Hao , Xu Yilun , Tom Rix Cc: Marco Pagani , linux-kernel@vger.kernel.org, linux-fpga@vger.kernel.org Subject: [RFC PATCH v5 2/4] fpga: add fake FPGA bridge Date: Thu, 11 May 2023 16:19:20 +0200 Message-Id: <20230511141922.437328-3-marpagan@redhat.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230511141922.437328-1-marpagan@redhat.com> References: <20230511141922.437328-1-marpagan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add fake FPGA bridge platform driver with support functions. This module is part of the KUnit tests for the FPGA subsystem. Signed-off-by: Marco Pagani --- drivers/fpga/tests/fake-fpga-bridge.c | 203 ++++++++++++++++++++++++++ drivers/fpga/tests/fake-fpga-bridge.h | 40 +++++ 2 files changed, 243 insertions(+) create mode 100644 drivers/fpga/tests/fake-fpga-bridge.c create mode 100644 drivers/fpga/tests/fake-fpga-bridge.h diff --git a/drivers/fpga/tests/fake-fpga-bridge.c b/drivers/fpga/tests/fak= e-fpga-bridge.c new file mode 100644 index 000000000000..e5db0a809ee3 --- /dev/null +++ b/drivers/fpga/tests/fake-fpga-bridge.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for the fake FPGA bridge + * + * Copyright (C) 2023 Red Hat, Inc. + * + * Author: Marco Pagani + */ + +#include +#include +#include +#include +#include + +#include "fake-fpga-bridge.h" + +#define FAKE_FPGA_BRIDGE_DEV_NAME "fake_fpga_bridge" + +struct fake_bridge_pdata { + struct kunit *test; + struct fake_fpga_bridge_stats *stats; +}; + +struct fake_bridge_priv { + bool state; + struct fake_bridge_pdata *pdata; +}; + +static int op_enable_show(struct fpga_bridge *bridge) +{ + struct fake_bridge_priv *priv; + + priv =3D bridge->priv; + + kunit_info(priv->pdata->test, "Fake FPGA bridge %u: enable_show\n", + bridge->dev.id); + + return priv->state; +} + +static int op_enable_set(struct fpga_bridge *bridge, bool enable) +{ + struct fake_bridge_priv *priv; + + priv =3D bridge->priv; + + if (enable && !priv->state) + priv->pdata->stats->cycles_count++; + + priv->state =3D enable; + priv->pdata->stats->enable =3D priv->state; + + kunit_info(priv->pdata->test, "Fake FPGA bridge %u: enable_set: %d\n", + bridge->dev.id, enable); + + return 0; +} + +static void op_remove(struct fpga_bridge *bridge) +{ + struct fake_bridge_priv *priv; + + priv =3D bridge->priv; + + kunit_info(priv->pdata->test, "Fake FPGA bridge %u: remove\n", + bridge->dev.id); +} + +static const struct fpga_bridge_ops fake_fpga_bridge_ops =3D { + .enable_show =3D op_enable_show, + .enable_set =3D op_enable_set, + .fpga_bridge_remove =3D op_remove, +}; + +/** + * fake_fpga_bridge_register() - register a fake FPGA bridge. + * @test: KUnit test context object. + * @parent: parent device. + * + * Return: pointer to a new fake FPGA bridge on success, an ERR_PTR() + * encoded error code on failure. + */ +struct fake_fpga_bridge * +fake_fpga_bridge_register(struct kunit *test, struct device *parent) +{ + struct fake_fpga_bridge *bridge_ctx; + struct fake_bridge_pdata pdata; + struct fake_bridge_priv *priv; + int ret; + + bridge_ctx =3D kunit_kzalloc(test, sizeof(*bridge_ctx), GFP_KERNEL); + if (!bridge_ctx) { + ret =3D -ENOMEM; + goto err_mem; + } + + bridge_ctx->pdev =3D platform_device_alloc(FAKE_FPGA_BRIDGE_DEV_NAME, + PLATFORM_DEVID_AUTO); + if (!bridge_ctx->pdev) { + pr_err("Fake FPGA bridge device allocation failed\n"); + ret =3D -ENOMEM; + goto err_mem; + } + + pdata.test =3D test; + pdata.stats =3D &bridge_ctx->stats; + platform_device_add_data(bridge_ctx->pdev, &pdata, sizeof(pdata)); + + bridge_ctx->pdev->dev.parent =3D parent; + ret =3D platform_device_add(bridge_ctx->pdev); + if (ret) { + pr_err("Fake FPGA bridge device add failed\n"); + goto err_pdev; + } + + bridge_ctx->bridge =3D platform_get_drvdata(bridge_ctx->pdev); + + priv =3D bridge_ctx->bridge->priv; + bridge_ctx->stats.enable =3D priv->state; + + kunit_info(test, "Fake FPGA bridge %u: registered\n", + bridge_ctx->bridge->dev.id); + + return bridge_ctx; + +err_pdev: + platform_device_put(bridge_ctx->pdev); +err_mem: + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(fake_fpga_bridge_register); + +/** + * fake_fpga_bridge_unregister() - unregister a fake FPGA bridge. + * @bridge_ctx: fake FPGA bridge context data structure. + */ +void fake_fpga_bridge_unregister(struct fake_fpga_bridge *bridge_ctx) +{ + struct fake_bridge_priv *priv; + struct kunit *test; + u32 id; + + if (!bridge_ctx) + return; + + id =3D bridge_ctx->bridge->dev.id; + priv =3D bridge_ctx->bridge->priv; + test =3D priv->pdata->test; + + platform_device_unregister(bridge_ctx->pdev); + + kunit_info(test, "Fake FPGA bridge %u: unregistered\n", id); +} +EXPORT_SYMBOL_GPL(fake_fpga_bridge_unregister); + +static int fake_fpga_bridge_probe(struct platform_device *pdev) +{ + struct device *dev; + struct fake_bridge_pdata *pdata; + struct fpga_bridge *bridge; + struct fake_bridge_priv *priv; + + dev =3D &pdev->dev; + pdata =3D dev_get_platdata(dev); + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->pdata =3D pdata; + priv->state =3D true; + + bridge =3D fpga_bridge_register(dev, "Fake FPGA Bridge", + &fake_fpga_bridge_ops, priv); + if (IS_ERR(bridge)) + return PTR_ERR(bridge); + + platform_set_drvdata(pdev, bridge); + + return 0; +} + +static int fake_fpga_bridge_remove(struct platform_device *pdev) +{ + struct fpga_bridge *bridge =3D platform_get_drvdata(pdev); + + fpga_bridge_unregister(bridge); + + return 0; +} + +static struct platform_driver fake_fpga_bridge_drv =3D { + .driver =3D { + .name =3D FAKE_FPGA_BRIDGE_DEV_NAME + }, + .probe =3D fake_fpga_bridge_probe, + .remove =3D fake_fpga_bridge_remove, +}; + +module_platform_driver(fake_fpga_bridge_drv); + +MODULE_LICENSE("GPL"); diff --git a/drivers/fpga/tests/fake-fpga-bridge.h b/drivers/fpga/tests/fak= e-fpga-bridge.h new file mode 100644 index 000000000000..3ecfab7e2890 --- /dev/null +++ b/drivers/fpga/tests/fake-fpga-bridge.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Header file for the fake FPGA bridge + * + * Copyright (C) 2023 Red Hat, Inc. + * + * Author: Marco Pagani + */ + +#ifndef __FPGA_FAKE_BRIDGE_H +#define __FPGA_FAKE_BRIDGE_H + +#include +#include +#include + +struct fake_fpga_bridge_stats { + bool enable; + u32 cycles_count; +}; + +/** + * struct fake_fpga_bridge - fake FPGA bridge context data structure + * + * @bridge: FPGA bridge. + * @pdev: platform device of the FPGA bridge. + * @stats: info from the low level driver. + */ +struct fake_fpga_bridge { + struct fpga_bridge *bridge; + struct platform_device *pdev; + struct fake_fpga_bridge_stats stats; +}; + +struct fake_fpga_bridge * +fake_fpga_bridge_register(struct kunit *test, struct device *parent); + +void fake_fpga_bridge_unregister(struct fake_fpga_bridge *bridge_ctx); + +#endif /* __FPGA_FAKE_BRIDGE_H */ --=20 2.40.1