From patchwork Mon Jan 10 01:49:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 12708066 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 97C37C433EF for ; Mon, 10 Jan 2022 01:52:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PZnTy1TSXef2lDIPp33a9I2IoI0ITtzHCHynYv5ckbw=; b=JNCGMGD2HT1kXv mIZRE2zqi0ZfUxV2/7wM5GSwQPKW2cd5XfrhXJWE0iswJ+6/dSWIIEXQB+5R9LauufAHdB4ctYaKw 06X7KExAe/Vo/UZ5nBC0SyZb8g0zQdIpksqNFh0oP/y5gReKm/FgJDnqpxbcJk3nj8ntKdhLcWpp0 7Wh8zVoc8zqzLBJW6J490odbH3LCe8sSpCyrbli4/PeibWj8/ip7WxkKBT1Ju/d/S09WOwZUOiclh oeTJIzUJ0jRL1tarvt6xRz96ifHe1OhA0wPkanhPfSCpyFQfKl/XGLZzildT1ofoUBALHYdMP1g09 3QeCwYPZkBB//d2Oj9+g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n6jq5-008lt8-1d; Mon, 10 Jan 2022 01:51:13 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n6jpR-008lbG-FT for linux-arm-kernel@lists.infradead.org; Mon, 10 Jan 2022 01:50:35 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0082160F4A; Mon, 10 Jan 2022 01:50:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8E53C36AEF; Mon, 10 Jan 2022 01:50:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641779432; bh=PYUoajvMFfvEnqE0r+a8fDw7RtXce9LHMlxeX26VGPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dFTGKK3inThb2/bhj0UvK47MlHsLxMchmS8oR8padAsO+phJABtdaTWPUtKihbiRp wlVY7SZR0pu5GfBILOYzCEX6g4hsbe9aT/4WfwWbQ5otXyb1oirYan/2UFYp5fzDTN DFJAi9udUGOD8enpZQVP8cYBbVE0LTRShB0jVHXG044v7ARFSknQF0g5yMIvu9PkcW T0d2tXlQngWAcQ3wQSEz6ClF5X4jxjaAPT7at97uKLmlehlX+T9XFCuicafu7HsTVt 7IvdBnPdsi+bm4Xnq20upi5BiM12qfr8QnrrGCLNWJV/KP5vSGd0urle39yJSX/OGk NlEnDbbwNW9Gg== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: Marc Zyngier , Lorenzo Pieralisi , Bjorn Helgaas Cc: pali@kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH v2 04/23] PCI: aardvark: Rewrite IRQ code to chained IRQ handler Date: Mon, 10 Jan 2022 02:49:59 +0100 Message-Id: <20220110015018.26359-5-kabel@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220110015018.26359-1-kabel@kernel.org> References: <20220110015018.26359-1-kabel@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220109_175033_623838_A9CA41C2 X-CRM114-Status: GOOD ( 18.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Pali Rohár Rewrite the code to use irq_set_chained_handler_and_data() handler with chained_irq_enter() and chained_irq_exit() processing instead of using devm_request_irq(). advk_pcie_irq_handler() reads IRQ status bits and calls other functions based on which bits are set. These functions then read its own IRQ status bits and calls other aardvark functions based on these bits. Finally generic_handle_domain_irq() with translated linux IRQ numbers are called. Signed-off-by: Pali Rohár Signed-off-by: Marek Behún --- drivers/pci/controller/pci-aardvark.c | 48 +++++++++++++++------------ 1 file changed, 26 insertions(+), 22 deletions(-) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 346d38835539..315147f2812f 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -269,6 +269,7 @@ struct advk_pcie { u32 actions; } wins[OB_WIN_COUNT]; u8 wins_count; + int irq; struct irq_domain *irq_domain; struct irq_chip irq_chip; raw_spinlock_t irq_lock; @@ -1437,21 +1438,26 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie) } } -static irqreturn_t advk_pcie_irq_handler(int irq, void *arg) +static void advk_pcie_irq_handler(struct irq_desc *desc) { - struct advk_pcie *pcie = arg; - u32 status; + struct advk_pcie *pcie = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 val, mask, status; - status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG); - if (!(status & PCIE_IRQ_CORE_INT)) - return IRQ_NONE; + chained_irq_enter(chip, desc); - advk_pcie_handle_int(pcie); + val = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG); + mask = advk_readl(pcie, HOST_CTRL_INT_MASK_REG); + status = val & ((~mask) & PCIE_IRQ_ALL_MASK); - /* Clear interrupt */ - advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG); + if (status & PCIE_IRQ_CORE_INT) { + advk_pcie_handle_int(pcie); - return IRQ_HANDLED; + /* Clear interrupt */ + advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG); + } + + chained_irq_exit(chip, desc); } static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie) @@ -1518,7 +1524,7 @@ static int advk_pcie_probe(struct platform_device *pdev) struct advk_pcie *pcie; struct pci_host_bridge *bridge; struct resource_entry *entry; - int ret, irq; + int ret; bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie)); if (!bridge) @@ -1604,17 +1610,9 @@ static int advk_pcie_probe(struct platform_device *pdev) if (IS_ERR(pcie->base)) return PTR_ERR(pcie->base); - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return irq; - - ret = devm_request_irq(dev, irq, advk_pcie_irq_handler, - IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie", - pcie); - if (ret) { - dev_err(dev, "Failed to register interrupt\n"); - return ret; - } + pcie->irq = platform_get_irq(pdev, 0); + if (pcie->irq < 0) + return pcie->irq; pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node, "reset-gpios", 0, @@ -1663,11 +1661,14 @@ static int advk_pcie_probe(struct platform_device *pdev) return ret; } + irq_set_chained_handler_and_data(pcie->irq, advk_pcie_irq_handler, pcie); + bridge->sysdata = pcie; bridge->ops = &advk_pcie_ops; ret = pci_host_probe(bridge); if (ret < 0) { + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); advk_pcie_remove_msi_irq_domain(pcie); advk_pcie_remove_irq_domain(pcie); return ret; @@ -1715,6 +1716,9 @@ static int advk_pcie_remove(struct platform_device *pdev) advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG); advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG); + /* Remove IRQ handler */ + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); + /* Remove IRQ domains */ advk_pcie_remove_msi_irq_domain(pcie); advk_pcie_remove_irq_domain(pcie);