From patchwork Wed Aug 17 23:00:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12946560 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 A2149C25B08 for ; Wed, 17 Aug 2022 23:05:05 +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=b+hJS4xmMWzr+n0ILvvzJWFPL6rdTaPXQthwI3b/iT0=; b=LQWXceGFyOu8GU GWBeHP8TU6fp12FTAEPLv3S/gTU2nkl7i1FyCqvzNYhx3KmmxuU4dJQj0z1oB36FiR1WOxrSXNP3D mr6mMRixDYzkG6a2N4JjbLZr4ZA+o3yDv3yFpN9KDDPYnFGZEr5kXoX8o54wxp+9P8jxwdo7ywEt4 2Gr3mnZtd1iAFSFLHZII/DxsSN3IRvIIvBl/f+jpzfl22rwvUmMLIpvrfnGTcMacymDsZLt5OZ4bu QKyF0hRaqOO/NXkIxRedUiI2GuXxr7guEG3j2C7bfLBq1cVj5aIik94sl6m9MCFjfPiRcXj7WxdDF aNlat+DMQxUIpvs5rnCQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOS4u-008DdG-QH; Wed, 17 Aug 2022 23:04:00 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOS4W-008D8h-Gw for linux-arm-kernel@lists.infradead.org; Wed, 17 Aug 2022 23:03:39 +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 1C70260F4D; Wed, 17 Aug 2022 23:03:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55F48C433B5; Wed, 17 Aug 2022 23:03:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660777415; bh=fekDNg1F4N2wBEf7RoTG3BeHW051EFSYazNh7Asi3Z4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lPokxyBzKMnKW8r7xusjkJRmM7NtARTr/Aj2BZBFZ5IPR+UPbR4RpxqjANXAagSVl doOyrUZEfkMmHDvBL26XwMg44wiU0yloMMOg752WHG2UrmmrlUm59GkvJpiQdksuQV u683XBUzRAH9UWZr1DNq9nX2svxeswlWNFRVbLpjwH2f4BBCQ0IN7cKJFsL5mgVMXV oMF3qZAsq4kmpMXpKCanRIuNgvqYLleF2Zq5wKHeqwSgndTlsY+S6U6R2chHqYcTs2 LsF0VvR1Lt1zsuuIc2SiubHULZiV9kJ366rv5tJWAUY7BCm/RTmOmYz1OMknZlRw6g FoOkRwTnONsUg== Received: by pali.im (Postfix) id 671912799; Thu, 18 Aug 2022 01:03:32 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilcz?= =?utf-8?q?y=C5=84ski?= , Bjorn Helgaas , Rob Herring , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Thomas Petazzoni Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/4] dt-bindings: PCI: mvebu: Update information about error interrupt Date: Thu, 18 Aug 2022 01:00:33 +0200 Message-Id: <20220817230036.817-2-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220817230036.817-1-pali@kernel.org> References: <20220817230036.817-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220817_160336_947188_F237D735 X-CRM114-Status: GOOD ( 10.97 ) 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 mvebu error interrupt is triggered by any non-intx event, which is mainly some pcie error. Signed-off-by: Pali Rohár Acked-by: Rob Herring Reviewed-by: Andrew Lunn --- Documentation/devicetree/bindings/pci/mvebu-pci.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/pci/mvebu-pci.txt b/Documentation/devicetree/bindings/pci/mvebu-pci.txt index 6d022a9d36ee..8f0bca42113f 100644 --- a/Documentation/devicetree/bindings/pci/mvebu-pci.txt +++ b/Documentation/devicetree/bindings/pci/mvebu-pci.txt @@ -83,6 +83,7 @@ and the following optional properties: specified will default to 100ms, as required by the PCIe specification. - interrupt-names: list of interrupt names, supported are: - "intx" - interrupt line triggered by one of the legacy interrupt + - "error" - interrupt line triggered by any other event (non-intx) - interrupts or interrupts-extended: List of the interrupt sources which corresponding to the "interrupt-names". If non-empty then also additional 'interrupt-controller' subnode must be defined. From patchwork Wed Aug 17 23:00:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12946562 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 20BD7C25B08 for ; Wed, 17 Aug 2022 23:05:32 +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=pcR5GI7plMGCL4kMtFQuFVZsAoQHKTfSaATjbModFbM=; b=tXjSN1Q0x4LC65 TyROBh3acRiNvFhXhzj/iO/stmYDurAN3n/tK/+Ps75O196XI/cjQPVUA3MVTpueDqArvHsCwNztM VDSkxhUgr+cBILGk+czZGvWBKYa9Lj+n5YkOv/JRIQ6QNxV3XKqZksUJGCvIFXPZ2ET4l1ioGTxeu 5D4NxOXUVA5QODUycDt32rTNwl4z3jmHA5hfOxG6mhJmLJRdk31cXFcsJcaCajdoy582/hvxdrunP Udhz5HF77j/uO1Wuh6YwfQXcr0Xvy3qGqPLzhHC07Vu2gVt5XJF+Eu4yKnItbslQ79qfjJ14H9ntX 8h/EUaX4XtZuENvTSEgg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOS5G-008Dyc-Kc; Wed, 17 Aug 2022 23:04:22 +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 1oOS4Y-008DB4-4s for linux-arm-kernel@lists.infradead.org; Wed, 17 Aug 2022 23:03:40 +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 0230660EFA; Wed, 17 Aug 2022 23:03:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F1C4C43140; Wed, 17 Aug 2022 23:03:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660777416; bh=lgW5f/v0qSxgkHrNjAqybtRTzfetRdmdVzUBSAlIV5w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZFaYqrKzgvt6kvzkh+Npk/YVeKgZI0fzIbR//n3JUdyyEtGVS9P5H5Q5GdfgPaIgQ /7qDmuvHATEpBajqKaB5miDiVpR+ombNoJZaS2siIY2aojzXqnZEolBcsIgbU78vTZ KVhf7iGy/U6Zpy/jOKMBzhqNmtmD7K1/bvYq14fgpT5lwl12IOaIRmJtDyid2tl17w 0xKFpcDK4nuC7eyC7F9mJNn0p/N4STKPqrly/UjVpejaQ7I5eeQnhhnAVbdYQYjHnU iSM4iFPf4wzKOxkrOPcQ8Lrg/Lg3kWmJINAasvEoFB1GllriVqPVJwvA4T6wax7Eik q7V3/LWcySvZg== Received: by pali.im (Postfix) id 618D927CB; Thu, 18 Aug 2022 01:03:33 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilcz?= =?utf-8?q?y=C5=84ski?= , Bjorn Helgaas , Rob Herring , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Thomas Petazzoni Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/4] PCI: mvebu: Implement support for interrupts on emulated bridge Date: Thu, 18 Aug 2022 01:00:34 +0200 Message-Id: <20220817230036.817-3-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220817230036.817-1-pali@kernel.org> References: <20220817230036.817-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220817_160338_328149_1032F8D1 X-CRM114-Status: GOOD ( 38.32 ) 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 This adds support for PME and ERR interrupts reported by emulated bridge (for PME and AER kernel drivers) via new Root Port irq chip as these interrupts from PCIe Root Ports are handled by mvebu hardware completely separately from INTx and MSI interrupts send by real PCIe devices. With this change, kernel PME and AER drivers start working as they can acquire required interrupt lines (provided by mvebu rp virtual irq chip). Note that for this support, device tree files has to be properly adjusted to provide "interrupts" or "interrupts-extended" property with error interrupt source and "interrupt-names" property with "error" string. If device tree files do not provide these properties then driver would work as before and would not provide interrupts on emulated bridge, like before. Signed-off-by: Pali Rohár --- drivers/pci/controller/pci-mvebu.c | 256 ++++++++++++++++++++++++++--- 1 file changed, 237 insertions(+), 19 deletions(-) diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c index 54ce5d43b695..e69bdaa8de43 100644 --- a/drivers/pci/controller/pci-mvebu.c +++ b/drivers/pci/controller/pci-mvebu.c @@ -56,8 +56,16 @@ #define PCIE_CONF_DATA_OFF 0x18fc #define PCIE_INT_CAUSE_OFF 0x1900 #define PCIE_INT_UNMASK_OFF 0x1910 +#define PCIE_INT_DET_COR BIT(8) +#define PCIE_INT_DET_NONFATAL BIT(9) +#define PCIE_INT_DET_FATAL BIT(10) +#define PCIE_INT_ERR_FATAL BIT(16) +#define PCIE_INT_ERR_NONFATAL BIT(17) +#define PCIE_INT_ERR_COR BIT(18) #define PCIE_INT_INTX(i) BIT(24+i) #define PCIE_INT_PM_PME BIT(28) +#define PCIE_INT_DET_MASK (PCIE_INT_DET_COR | PCIE_INT_DET_NONFATAL | PCIE_INT_DET_FATAL) +#define PCIE_INT_ERR_MASK (PCIE_INT_ERR_FATAL | PCIE_INT_ERR_NONFATAL | PCIE_INT_ERR_COR) #define PCIE_INT_ALL_MASK GENMASK(31, 0) #define PCIE_CTRL_OFF 0x1a00 #define PCIE_CTRL_X1_MODE 0x0001 @@ -120,9 +128,12 @@ struct mvebu_pcie_port { struct resource regs; u8 slot_power_limit_value; u8 slot_power_limit_scale; + struct irq_domain *rp_irq_domain; struct irq_domain *intx_irq_domain; raw_spinlock_t irq_lock; + int error_irq; int intx_irq; + bool pme_pending; }; static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg) @@ -321,9 +332,19 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) /* Clear all interrupt causes. */ mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF); - /* Check if "intx" interrupt was specified in DT. */ - if (port->intx_irq > 0) - return; + /* + * Unmask all error interrupts which are internally generated. + * They cannot be disabled by SERR# Enable bit in PCI Command register, + * see Figure 6-3: Pseudo Logic Diagram for Error Message Controls in + * PCIe base specification. + * Internally generated mvebu interrupts are reported via mvebu summary + * interrupt which requires "error" interrupt to be specified in DT. + */ + if (port->error_irq > 0) { + unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + unmask |= PCIE_INT_DET_MASK; + mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); + } /* * Fallback code when "intx" interrupt was not specified in DT: @@ -335,10 +356,12 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) * performance penalty as every PCIe interrupt handler needs to be * called when some interrupt is triggered. */ - unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); - unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | - PCIE_INT_INTX(2) | PCIE_INT_INTX(3); - mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); + if (port->intx_irq <= 0) { + unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | + PCIE_INT_INTX(2) | PCIE_INT_INTX(3); + mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); + } } static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie, @@ -603,11 +626,16 @@ mvebu_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge, case PCI_INTERRUPT_LINE: { /* * From the whole 32bit register we support reading from HW only - * one bit: PCI_BRIDGE_CTL_BUS_RESET. + * two bits: PCI_BRIDGE_CTL_BUS_RESET and PCI_BRIDGE_CTL_SERR. * Other bits are retrieved only from emulated config buffer. */ __le32 *cfgspace = (__le32 *)&bridge->conf; u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]); + if ((mvebu_readl(port, PCIE_INT_UNMASK_OFF) & + PCIE_INT_ERR_MASK) == PCIE_INT_ERR_MASK) + val |= PCI_BRIDGE_CTL_SERR << 16; + else + val &= ~(PCI_BRIDGE_CTL_SERR << 16); if (mvebu_readl(port, PCIE_CTRL_OFF) & PCIE_CTRL_MASTER_HOT_RESET) val |= PCI_BRIDGE_CTL_BUS_RESET << 16; else @@ -675,6 +703,11 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, break; } + case PCI_EXP_RTCTL: + *value = (mvebu_readl(port, PCIE_INT_UNMASK_OFF) & + PCIE_INT_PM_PME) ? PCI_EXP_RTCTL_PMEIE : 0; + break; + case PCI_EXP_RTSTA: *value = mvebu_readl(port, PCIE_RC_RTSTA); break; @@ -780,6 +813,14 @@ mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge, break; case PCI_INTERRUPT_LINE: + if ((mask & (PCI_BRIDGE_CTL_SERR << 16)) && port->error_irq > 0) { + u32 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + if (new & (PCI_BRIDGE_CTL_SERR << 16)) + unmask |= PCIE_INT_ERR_MASK; + else + unmask &= ~PCIE_INT_ERR_MASK; + mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); + } if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) { u32 ctrl = mvebu_readl(port, PCIE_CTRL_OFF); if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16)) @@ -838,10 +879,25 @@ mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge, * PME Status bit in Root Status Register (PCIE_RC_RTSTA) * is read-only and can be cleared only by writing 0b to the * Interrupt Cause RW0C register (PCIE_INT_CAUSE_OFF). So - * clear PME via Interrupt Cause. + * clear PME via Interrupt Cause and also set port->pme_pending + * variable to false value to start processing PME interrupts + * in interrupt handler again. */ - if (new & PCI_EXP_RTSTA_PME) + if (new & PCI_EXP_RTSTA_PME) { mvebu_writel(port, ~PCIE_INT_PM_PME, PCIE_INT_CAUSE_OFF); + port->pme_pending = false; + } + break; + + case PCI_EXP_RTCTL: + if ((mask & PCI_EXP_RTCTL_PMEIE) && port->error_irq > 0) { + u32 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + if (new & PCI_EXP_RTCTL_PMEIE) + unmask |= PCIE_INT_PM_PME; + else + unmask &= ~PCIE_INT_PM_PME; + mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); + } break; case PCI_EXP_DEVCTL2: @@ -924,6 +980,14 @@ static int mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port) bridge_flags |= PCI_BRIDGE_EMUL_NO_IO_FORWARD; } + /* + * Interrupts on emulated bridge are supported only when "error" + * interrupt was specified in DT. Without it emulated bridge cannot + * emulate interrupts. + */ + if (port->error_irq > 0) + bridge->conf.intpin = PCI_INTERRUPT_INTA; + /* * Older mvebu hardware provides PCIe Capability structure only in * version 1. New hardware provides it in version 2. @@ -1072,6 +1136,26 @@ static const struct irq_domain_ops mvebu_pcie_intx_irq_domain_ops = { .xlate = irq_domain_xlate_onecell, }; +static struct irq_chip rp_irq_chip = { + .name = "mvebu-rp", +}; + +static int mvebu_pcie_rp_irq_map(struct irq_domain *h, + unsigned int virq, irq_hw_number_t hwirq) +{ + struct mvebu_pcie_port *port = h->host_data; + + irq_set_chip_and_handler(virq, &rp_irq_chip, handle_simple_irq); + irq_set_chip_data(virq, port); + + return 0; +} + +static const struct irq_domain_ops mvebu_pcie_rp_irq_domain_ops = { + .map = mvebu_pcie_rp_irq_map, + .xlate = irq_domain_xlate_onecell, +}; + static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port) { struct device *dev = &port->pcie->pdev->dev; @@ -1094,10 +1178,72 @@ static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port) return -ENOMEM; } + /* + * When "error" interrupt was not specified in DT then there is no + * support for interrupts on emulated root bridge. So skip following + * initialization. + */ + if (port->error_irq <= 0) + return 0; + + port->rp_irq_domain = irq_domain_add_linear(NULL, 1, + &mvebu_pcie_rp_irq_domain_ops, + port); + if (!port->rp_irq_domain) { + irq_domain_remove(port->intx_irq_domain); + dev_err(dev, "Failed to add Root Port IRQ domain for %s\n", port->name); + return -ENOMEM; + } + return 0; } -static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) +static irqreturn_t mvebu_pcie_error_irq_handler(int irq, void *arg) +{ + struct mvebu_pcie_port *port = arg; + struct device *dev = &port->pcie->pdev->dev; + u32 cause, unmask, status; + + cause = mvebu_readl(port, PCIE_INT_CAUSE_OFF); + unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); + status = cause & unmask; + + /* "error" interrupt handler does not process INTX interrupts */ + status &= ~(PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | + PCIE_INT_INTX(2) | PCIE_INT_INTX(3)); + + /* Process PME interrupt */ + if ((status & PCIE_INT_PM_PME) && !port->pme_pending) { + /* + * Do not clear PME interrupt bit in Cause Register as it + * invalidates also content of Root Status Register. Instead + * set port->pme_pending variable to true to indicate that + * next time PME interrupt should be ignored until variable + * is back to the false value. + */ + port->pme_pending = true; + if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) + dev_err_ratelimited(dev, "unhandled PME IRQ\n"); + } + + /* Process ERR interrupt */ + if (status & PCIE_INT_ERR_MASK) { + mvebu_writel(port, ~PCIE_INT_ERR_MASK, PCIE_INT_CAUSE_OFF); + if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) + dev_err_ratelimited(dev, "unhandled ERR IRQ\n"); + } + + /* Process local ERR interrupt */ + if (status & PCIE_INT_DET_MASK) { + mvebu_writel(port, ~PCIE_INT_DET_MASK, PCIE_INT_CAUSE_OFF); + if (generic_handle_domain_irq(port->rp_irq_domain, 0) == -EINVAL) + dev_err_ratelimited(dev, "unhandled ERR IRQ\n"); + } + + return status ? IRQ_HANDLED : IRQ_NONE; +} + +static irqreturn_t mvebu_pcie_intx_irq_handler(int irq, void *arg) { struct mvebu_pcie_port *port = arg; struct device *dev = &port->pcie->pdev->dev; @@ -1108,6 +1254,10 @@ static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); status = cause & unmask; + /* "intx" interrupt handler process only INTX interrupts */ + status &= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | + PCIE_INT_INTX(2) | PCIE_INT_INTX(3); + /* Process legacy INTx interrupts */ for (i = 0; i < PCI_NUM_INTX; i++) { if (!(status & PCIE_INT_INTX(i))) @@ -1122,9 +1272,29 @@ static irqreturn_t mvebu_pcie_irq_handler(int irq, void *arg) static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { - /* Interrupt support on mvebu emulated bridges is not implemented yet */ - if (dev->bus->number == 0) - return 0; /* Proper return code 0 == NO_IRQ */ + struct mvebu_pcie_port *port; + struct mvebu_pcie *pcie; + + if (dev->bus->number == 0) { + /* + * Each emulated root bridge for every mvebu port has its own + * Root Port irq chip and irq domain. Argument pin is the INTx + * pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) and hwirq for function + * irq_create_mapping() is indexed from zero. + */ + pcie = dev->bus->sysdata; + port = mvebu_pcie_find_port(pcie, dev->bus, PCI_DEVFN(slot, 0)); + if (!port) + return 0; /* Proper return code 0 == NO_IRQ */ + /* + * port->rp_irq_domain is available only when "error" interrupt + * was specified in DT. When is not available then interrupts + * for emulated root bridge are not provided. + */ + if (port->error_irq <= 0) + return 0; /* Proper return code 0 == NO_IRQ */ + return irq_create_mapping(port->rp_irq_domain, pin - 1); + } return of_irq_parse_and_map_pci(dev, slot, pin); } @@ -1333,6 +1503,21 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, port->name, child); } + /* + * Old DT bindings do not contain "error" interrupt + * so do not fail probing driver when interrupt does not exist. + */ + port->error_irq = of_irq_get_byname(child, "error"); + if (port->error_irq == -EPROBE_DEFER) { + ret = port->error_irq; + goto err; + } + if (port->error_irq <= 0) { + dev_warn(dev, "%s: interrupts on Root Port are unsupported, " + "%pOF does not contain error interrupt\n", + port->name, child); + } + reset_gpio = of_get_named_gpio_flags(child, "reset-gpios", 0, &flags); if (reset_gpio == -EPROBE_DEFER) { ret = reset_gpio; @@ -1538,7 +1723,6 @@ static int mvebu_pcie_probe(struct platform_device *pdev) for (i = 0; i < pcie->nports; i++) { struct mvebu_pcie_port *port = &pcie->ports[i]; - int irq = port->intx_irq; child = port->dn; if (!child) @@ -1566,7 +1750,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev) continue; } - if (irq > 0) { + if (port->error_irq > 0 || port->intx_irq > 0) { ret = mvebu_pcie_init_irq_domain(port); if (ret) { dev_err(dev, "%s: cannot init irq domain\n", @@ -1577,14 +1761,42 @@ static int mvebu_pcie_probe(struct platform_device *pdev) mvebu_pcie_powerdown(port); continue; } + } + + if (port->error_irq > 0) { + ret = devm_request_irq(dev, port->error_irq, + mvebu_pcie_error_irq_handler, + IRQF_SHARED | IRQF_NO_THREAD, + port->name, port); + if (ret) { + dev_err(dev, "%s: cannot register error interrupt handler: %d\n", + port->name, ret); + if (port->intx_irq_domain) + irq_domain_remove(port->intx_irq_domain); + if (port->rp_irq_domain) + irq_domain_remove(port->rp_irq_domain); + pci_bridge_emul_cleanup(&port->bridge); + devm_iounmap(dev, port->base); + port->base = NULL; + mvebu_pcie_powerdown(port); + continue; + } + } - ret = devm_request_irq(dev, irq, mvebu_pcie_irq_handler, + if (port->intx_irq > 0) { + ret = devm_request_irq(dev, port->intx_irq, + mvebu_pcie_intx_irq_handler, IRQF_SHARED | IRQF_NO_THREAD, port->name, port); if (ret) { - dev_err(dev, "%s: cannot register interrupt handler: %d\n", + dev_err(dev, "%s: cannot register intx interrupt handler: %d\n", port->name, ret); - irq_domain_remove(port->intx_irq_domain); + if (port->error_irq > 0) + devm_free_irq(dev, port->error_irq, port); + if (port->intx_irq_domain) + irq_domain_remove(port->intx_irq_domain); + if (port->rp_irq_domain) + irq_domain_remove(port->rp_irq_domain); pci_bridge_emul_cleanup(&port->bridge); devm_iounmap(dev, port->base); port->base = NULL; @@ -1722,6 +1934,12 @@ static int mvebu_pcie_remove(struct platform_device *pdev) } irq_domain_remove(port->intx_irq_domain); } + if (port->rp_irq_domain) { + int virq = irq_find_mapping(port->rp_irq_domain, 0); + if (virq > 0) + irq_dispose_mapping(virq); + irq_domain_remove(port->rp_irq_domain); + } /* Free config space for emulated root bridge. */ pci_bridge_emul_cleanup(&port->bridge); From patchwork Wed Aug 17 23:00:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12946558 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 98291C25B08 for ; Wed, 17 Aug 2022 23:04:58 +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; 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Wed, 17 Aug 2022 23:03:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA13DC433C1; Wed, 17 Aug 2022 23:03:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660777415; bh=JELlqfEhsdApV8P72cKb67VDmduJhfcW++RF8mpUbiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S2LTdRPtqZMQj0xPZD/ddzoBoQJv6vtfDtwaHFOZgcrj31nsv20UeerQ0tU1dwdKv r7b5TcACIXKklUWL73+X80ihZuriqjo8OX5AdQuH1aQ5VqJd1d5frikQ9V4tmG8JBZ htDilh7cyogNHsykKf0/IqlbpSmUJ/UQS7NrOhqfzyY/1GWJPRjHvEAWFyzSVSjQ2a beKLFVYrtcHpT/ovj/kQ3rL5q/9QUpxV/h0dF+yjLLXGbJqc4oHI9WuP1kCiL3VtfX Q/kSq2ZYCujHXAVLBsrVzbozxowoHW35pZg6Wuj7isMmWQBXX2fRbTTLQKO/r9yrgb EVEADnwAiLjyw== Received: by pali.im (Postfix) id 62C1827E1; Thu, 18 Aug 2022 01:03:34 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilcz?= =?utf-8?q?y=C5=84ski?= , Bjorn Helgaas , Rob Herring , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Thomas Petazzoni Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 3/4] ARM: dts: kirkwood: Add definitions for PCIe error interrupts Date: Thu, 18 Aug 2022 01:00:35 +0200 Message-Id: <20220817230036.817-4-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220817230036.817-1-pali@kernel.org> References: <20220817230036.817-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220817_160336_600890_4D219F86 X-CRM114-Status: GOOD ( 13.50 ) 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 First PCIe controller on Kirkwood SoC reports error interrupt via IRQ 44 and second PCIe controller via IRQ 45. Signed-off-by: Pali Rohár Reviewed-by: Andrew Lunn --- arch/arm/boot/dts/kirkwood-6192.dtsi | 4 ++-- arch/arm/boot/dts/kirkwood-6281.dtsi | 4 ++-- arch/arm/boot/dts/kirkwood-6282.dtsi | 8 ++++---- arch/arm/boot/dts/kirkwood-98dx4122.dtsi | 4 ++-- 4 files changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/arm/boot/dts/kirkwood-6192.dtsi b/arch/arm/boot/dts/kirkwood-6192.dtsi index 07f4f7f98c0c..705c0d7effed 100644 --- a/arch/arm/boot/dts/kirkwood-6192.dtsi +++ b/arch/arm/boot/dts/kirkwood-6192.dtsi @@ -26,8 +26,8 @@ ranges = <0x82000000 0 0 0x82000000 0x1 0 1 0 0x81000000 0 0 0x81000000 0x1 0 1 0>; bus-range = <0x00 0xff>; - interrupt-names = "intx"; - interrupts = <9>; + interrupt-names = "intx", "error"; + interrupts = <9>, <44>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie_intc 0>, <0 0 0 2 &pcie_intc 1>, diff --git a/arch/arm/boot/dts/kirkwood-6281.dtsi b/arch/arm/boot/dts/kirkwood-6281.dtsi index d08a9a5ecc26..8e311165fd13 100644 --- a/arch/arm/boot/dts/kirkwood-6281.dtsi +++ b/arch/arm/boot/dts/kirkwood-6281.dtsi @@ -26,8 +26,8 @@ ranges = <0x82000000 0 0 0x82000000 0x1 0 1 0 0x81000000 0 0 0x81000000 0x1 0 1 0>; bus-range = <0x00 0xff>; - interrupt-names = "intx"; - interrupts = <9>; + interrupt-names = "intx", "error"; + interrupts = <9>, <44>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie_intc 0>, <0 0 0 2 &pcie_intc 1>, diff --git a/arch/arm/boot/dts/kirkwood-6282.dtsi b/arch/arm/boot/dts/kirkwood-6282.dtsi index 2eea5b304f47..e33723160ce7 100644 --- a/arch/arm/boot/dts/kirkwood-6282.dtsi +++ b/arch/arm/boot/dts/kirkwood-6282.dtsi @@ -30,8 +30,8 @@ ranges = <0x82000000 0 0 0x82000000 0x1 0 1 0 0x81000000 0 0 0x81000000 0x1 0 1 0>; bus-range = <0x00 0xff>; - interrupt-names = "intx"; - interrupts = <9>; + interrupt-names = "intx", "error"; + interrupts = <9>, <44>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie0_intc 0>, <0 0 0 2 &pcie0_intc 1>, @@ -58,8 +58,8 @@ ranges = <0x82000000 0 0 0x82000000 0x2 0 1 0 0x81000000 0 0 0x81000000 0x2 0 1 0>; bus-range = <0x00 0xff>; - interrupt-names = "intx"; - interrupts = <10>; + interrupt-names = "intx", "error"; + interrupts = <10>, <45>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie1_intc 0>, <0 0 0 2 &pcie1_intc 1>, diff --git a/arch/arm/boot/dts/kirkwood-98dx4122.dtsi b/arch/arm/boot/dts/kirkwood-98dx4122.dtsi index 070bc13242b8..c3469a2fc58a 100644 --- a/arch/arm/boot/dts/kirkwood-98dx4122.dtsi +++ b/arch/arm/boot/dts/kirkwood-98dx4122.dtsi @@ -26,8 +26,8 @@ ranges = <0x82000000 0 0 0x82000000 0x1 0 1 0 0x81000000 0 0 0x81000000 0x1 0 1 0>; bus-range = <0x00 0xff>; - interrupt-names = "intx"; - interrupts = <9>; + interrupt-names = "intx", "error"; + interrupts = <9>, <44>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie_intc 0>, <0 0 0 2 &pcie_intc 1>, From patchwork Wed Aug 17 23:00:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12946561 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 1579CC25B08 for ; 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Thu, 18 Aug 2022 01:03:35 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilcz?= =?utf-8?q?y=C5=84ski?= , Bjorn Helgaas , Rob Herring , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Thomas Petazzoni Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 4/4] ARM: dts: dove: Add definitions for PCIe error interrupts Date: Thu, 18 Aug 2022 01:00:36 +0200 Message-Id: <20220817230036.817-5-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220817230036.817-1-pali@kernel.org> References: <20220817230036.817-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220817_160337_046111_906F65B2 X-CRM114-Status: GOOD ( 12.51 ) 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 First PCIe controller on Dove SoC reports error interrupt via IRQ 15 and second PCIe controller via IRQ 17. Signed-off-by: Pali Rohár Reviewed-by: Andrew Lunn --- arch/arm/boot/dts/dove.dtsi | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm/boot/dts/dove.dtsi b/arch/arm/boot/dts/dove.dtsi index 70d45d2b1258..9aee3cfd3e98 100644 --- a/arch/arm/boot/dts/dove.dtsi +++ b/arch/arm/boot/dts/dove.dtsi @@ -122,8 +122,8 @@ bus-range = <0x00 0xff>; #interrupt-cells = <1>; - interrupt-names = "intx"; - interrupts = <16>; + interrupt-names = "intx", "error"; + interrupts = <16>, <15>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie0_intc 0>, <0 0 0 2 &pcie0_intc 1>, @@ -151,8 +151,8 @@ bus-range = <0x00 0xff>; #interrupt-cells = <1>; - interrupt-names = "intx"; - interrupts = <18>; + interrupt-names = "intx", "error"; + interrupts = <18>, <17>; interrupt-map-mask = <0 0 0 7>; interrupt-map = <0 0 0 1 &pcie1_intc 0>, <0 0 0 2 &pcie1_intc 1>,