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Wed, 10 Sep 2014 04:15:36 -0500 (CDT) Received: from SATLEXDAG01.amd.com (10.181.40.3) by satlvexedge01.amd.com (10.177.96.28) with Microsoft SMTP Server (TLS) id 14.3.195.1; Wed, 10 Sep 2014 04:15:40 -0500 Received: from localhost.localdomain (10.180.168.240) by SATLEXDAG01.amd.com (10.181.40.3) with Microsoft SMTP Server id 14.3.195.1; Wed, 10 Sep 2014 05:15:36 -0400 From: To: , , Subject: [PATCH 2/2 V5] irqchip: gicv2m: Add support for multiple MSI for ARM64 GICv2m Date: Wed, 10 Sep 2014 04:15:01 -0500 Message-ID: <1410340501-30752-3-git-send-email-suravee.suthikulpanit@amd.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1410340501-30752-1-git-send-email-suravee.suthikulpanit@amd.com> References: <1410340501-30752-1-git-send-email-suravee.suthikulpanit@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:165.204.84.221; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10019019)(979002)(6009001)(428002)(199003)(189002)(20776003)(92726001)(85306004)(47776003)(2201001)(86152002)(83072002)(92566001)(81342001)(90102001)(84676001)(50226001)(21056001)(106466001)(4396001)(64706001)(50466002)(81542001)(95666004)(46102001)(97736003)(48376002)(77982001)(36756003)(80022001)(76176999)(50986999)(76482001)(88136002)(105586002)(89996001)(86362001)(77096002)(101416001)(19580405001)(19580395003)(83322001)(44976005)(68736004)(93916002)(87286001)(74502001)(102836001)(49486002)(62966002)(104166001)(31966008)(229853001)(74662001)(85852003)(107046002)(77156001)(99396002)(33646002)(87936001)(79102001)(2004002)(969003)(989001)(999001)(1009001)(1019001); DIR:OUT; SFP:1102; SCL:1; SRVR:BN1PR02MB038; H:atltwp01.amd.com; FPR:; MLV:ovrnspm; PTR:InfoDomainNonexistent; A:1; MX:1; LANG:en; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;UriScan:; X-Forefront-PRVS: 033054F29A Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) Authentication-Results: spf=none (sender IP is 165.204.84.221) smtp.mailfrom=Suravee.Suthikulpanit@amd.com; X-OriginatorOrg: amd4.onmicrosoft.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140910_021603_693389_32CB9E88 X-CRM114-Status: GOOD ( 23.42 ) X-Spam-Score: -1.8 (-) Cc: Mark Rutland , devicetree@vger.kernel.org, pawel.moll@arm.com, linux-doc@vger.kernel.org, Marc Zyngier , Catalin.Marinas@arm.com, Harish.Kasiviswanathan@amd.com, linux-kernel@vger.kernel.org, Will.Deacon@arm.com, Suravee Suthikulpanit , linux-pci@vger.kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Suravee Suthikulpanit This patch extend GICv2m MSI to support multiple MSI in ARM64. This requires the common arch_setup_msi_irqs() to be overwriten with ARM64 version which does not return 1 for PCI_CAP_ID_MSI and nvec > 1. Cc: Mark Rutland Cc: Marc Zyngier Cc: Jason Cooper Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Suravee Suthikulpanit --- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/msi.c | 41 ++++++++++++++++++++ drivers/irqchip/irq-gic-v2m.c | 87 ++++++++++++++++++++++++++++++++++++++----- 3 files changed, 119 insertions(+), 10 deletions(-) create mode 100644 arch/arm64/kernel/msi.c diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index df7ef87..a921c42 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -29,6 +29,7 @@ arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o arm64-obj-$(CONFIG_KGDB) += kgdb.o arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o +arm64-obj-$(CONFIG_PCI_MSI) += msi.o obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/msi.c b/arch/arm64/kernel/msi.c new file mode 100644 index 0000000..a295862 --- /dev/null +++ b/arch/arm64/kernel/msi.c @@ -0,0 +1,41 @@ +/* + * ARM64 architectural MSI implemention + * + * Support for Message Signalelled Interrupts for systems that + * implement ARM Generic Interrupt Controller: GICv2m. + * + * Copyright (C) 2014 Advanced Micro Devices, Inc. + * Authors: Suravee Suthikulpanit + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include +#include +#include + +/* + * ARM64 function for seting up MSI irqs. + * Based on driver/pci/msi.c: arch_setup_msi_irqs(). + * + * Note: + * Current implementation assumes that all interrupt controller used in + * ARM64 architecture _MUST_ supports multi-MSI. + */ +int arm64_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + struct msi_desc *entry; + int ret; + + list_for_each_entry(entry, &dev->msi_list, list) { + ret = arch_setup_msi_irq(dev, entry); + if (ret < 0) + return ret; + if (ret > 0) + return -ENOSPC; + } + + return 0; +} diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index 2471e4c..7b52e67 100644 --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -99,13 +99,26 @@ static void gicv2m_teardown_msi_irq(struct msi_chip *chip, unsigned int irq) spin_unlock(&data->msi_cnt_lock); } +static int gicv2m_msi_get_vec_count(struct pci_dev *pdev, struct msi_desc *desc) +{ + int ret = -EINVAL; +#ifdef CONFIG_PCI_MSI + if (desc->msi_attrib.is_msix) + ret = pci_msix_vec_count(pdev); + else + ret = pci_msi_vec_count(pdev); +#endif + return ret; +} + static int gicv2m_setup_msi_irq(struct msi_chip *chip, struct pci_dev *pdev, struct msi_desc *desc) { - int irq, avail; + int i, irq, nvec, avail; struct msi_msg msg; phys_addr_t addr; + struct msi_desc *entry; struct v2m_data *data = container_of(chip, struct v2m_data, msi_chip); if (!desc) { @@ -114,16 +127,70 @@ static int gicv2m_setup_msi_irq(struct msi_chip *chip, return -EINVAL; } - avail = alloc_msi_irq(data, 1, &irq); - if (avail != 0) { - dev_err(&pdev->dev, - "GICv2m: MSI setup failed. Cannnot allocate IRQ\n"); - return -ENOSPC; - } + if (desc->msi_attrib.is_msix) { + /** + * For MSIx: + * We allocate one irq at a time + */ + avail = alloc_msi_irq(data, 1, &irq); + if (avail != 0) { + dev_err(&pdev->dev, + "GICv2m: MSI setup failed. Cannnot allocate IRQ\n"); + return -ENOSPC; + } - irq_set_chip_data(irq, chip); - irq_set_msi_desc(irq, desc); - irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); + irq_set_chip_data(irq, chip); + irq_set_msi_desc(irq, desc); + irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); + } else { + /** + * For MSI and Multi-MSI: + * All requested irqs are allocated and setup at + * once. Subsequent calls to this function would simply return + * success. This is to avoid having to implement a separate + * function for setting up multiple irqs. + */ + BUG_ON(list_empty(&pdev->msi_list)); + WARN_ON(!list_is_singular(&pdev->msi_list)); + + nvec = gicv2m_msi_get_vec_count(pdev, desc); + if (WARN_ON(nvec <= 0)) + return nvec; + + entry = list_first_entry(&pdev->msi_list, + struct msi_desc, list); + + if ((nvec > 1) && (entry->msi_attrib.multiple)) + return 0; + + avail = alloc_msi_irq(data, nvec, &irq); + if (avail != 0) { + dev_err(&pdev->dev, + "GICv2m: Failed to allocate %d irqs.\n", nvec); + return avail; + } + + if (nvec > 1) { + /* Set lowest of the new interrupts assigned + * to the PCI device + */ + entry->nvec_used = nvec; + entry->msi_attrib.multiple = ilog2( + __roundup_pow_of_two(nvec)); + } + + for (i = 0; i < nvec; i++) { + irq_set_chip_data(irq+i, chip); + if (irq_set_msi_desc_off(irq, i, entry)) { + dev_err(&pdev->dev, + "GICv2m: Failed to set up MSI irq %d\n", + (irq+i)); + return -EINVAL; + } + + irq_set_irq_type((irq+i), IRQ_TYPE_EDGE_RISING); + } + } addr = data->res.start + V2M_MSI_SETSPI_NS; msg.address_hi = (u32)(addr >> 32);