From patchwork Fri Oct 31 08:26:30 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suravee Suthikulpanit X-Patchwork-Id: 405237 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id DAC4C140080 for ; Fri, 31 Oct 2014 19:27:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756926AbaJaI1W (ORCPT ); Fri, 31 Oct 2014 04:27:22 -0400 Received: from [157.56.110.144] ([157.56.110.144]:34408 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1756918AbaJaI1Q (ORCPT ); Fri, 31 Oct 2014 04:27:16 -0400 Received: from BY2PR02CA0056.namprd02.prod.outlook.com (10.141.216.46) by BN1PR02MB198.namprd02.prod.outlook.com (10.242.214.151) with Microsoft SMTP Server (TLS) id 15.1.11.14; Fri, 31 Oct 2014 08:27:03 +0000 Received: from BL2FFO11FD054.protection.gbl (2a01:111:f400:7c09::145) by BY2PR02CA0056.outlook.office365.com (2a01:111:e400:2c40::46) with Microsoft SMTP Server (TLS) id 15.1.11.14 via Frontend Transport; Fri, 31 Oct 2014 08:27:02 +0000 Received: from atltwp02.amd.com (165.204.84.222) by BL2FFO11FD054.mail.protection.outlook.com (10.173.161.182) with Microsoft SMTP Server id 15.0.1049.20 via Frontend Transport; Fri, 31 Oct 2014 08:27:02 +0000 X-WSS-ID: 0NEAVGX-08-2HS-02 X-M-MSG: Received: from satlvexedge02.amd.com (satlvexedge02.amd.com [10.177.96.29]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by atltwp02.amd.com (Axway MailGate 5.3.1) with ESMTPS id 28AF5D16052; Fri, 31 Oct 2014 03:26:57 -0500 (CDT) Received: from SATLEXDAG03.amd.com (10.181.40.7) by SATLVEXEDGE02.amd.com (10.177.96.29) with Microsoft SMTP Server (TLS) id 14.3.195.1; Fri, 31 Oct 2014 03:27:01 -0500 Received: from ssuthiku-fedora-lt.amd.com (10.180.168.240) by satlexdag03.amd.com (10.181.40.7) with Microsoft SMTP Server id 14.3.195.1; Fri, 31 Oct 2014 04:27:00 -0400 From: To: , , , CC: , , , , , , , , , "Suravee Suthikulpanit" , Marc Zyngier , Mark Rutland Subject: [V9 PATCH 2/2] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X) Date: Fri, 31 Oct 2014 03:26:30 -0500 Message-ID: <1414743990-28421-3-git-send-email-suravee.suthikulpanit@amd.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1414743990-28421-1-git-send-email-suravee.suthikulpanit@amd.com> References: <1414743990-28421-1-git-send-email-suravee.suthikulpanit@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:165.204.84.222; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10019020)(6009001)(428002)(199003)(189002)(86362001)(85852003)(2201001)(86152002)(93916002)(575784001)(4396001)(50226001)(87286001)(120916001)(102836001)(99396003)(76482002)(92726001)(87936001)(46102003)(80022003)(88136002)(92566001)(31966008)(84676001)(101416001)(76176999)(50986999)(85306004)(95666004)(53416004)(97736003)(77096002)(68736004)(107046002)(48376002)(21056001)(50466002)(47776003)(62966002)(105586002)(33646002)(89996001)(229853001)(44976005)(19580395003)(36756003)(19580405001)(64706001)(20776003)(104166001)(77156001)(106466001); DIR:OUT; SFP:1102; SCL:1; SRVR:BN1PR02MB198; H:atltwp02.amd.com; FPR:; MLV:sfv; PTR:InfoDomainNonexistent; A:1; MX:1; LANG:en; X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;SRVR:BN1PR02MB198; X-Forefront-PRVS: 03818C953D Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) Authentication-Results: spf=none (sender IP is 165.204.84.222) smtp.mailfrom=Suravee.Suthikulpanit@amd.com; X-OriginatorOrg: amd4.onmicrosoft.com Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Suravee Suthikulpanit ARM GICv2m specification extends GICv2 to support MSI(-X) with a new set of register frame. This patch introduces support for the non-secure GICv2m register frame. Currently, GICV2m is available in certain version of GIC-400. The patch introduces a new property in ARM gic binding, the v2m subnode. It is optional. Cc: Marc Zyngier Cc: Mark Rutland Cc: Thomas Gleixner Cc: Jason Cooper Cc: Will Deacon Cc: Catalin Marinas Signed-off-by: Suravee Suthikulpanit --- Documentation/devicetree/bindings/arm/gic.txt | 53 ++++ arch/arm64/Kconfig | 1 + drivers/irqchip/Kconfig | 5 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-gic-v2m.c | 395 ++++++++++++++++++++++++++ drivers/irqchip/irq-gic-v2m.h | 7 + drivers/irqchip/irq-gic.c | 21 +- 7 files changed, 479 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt index c7d2fa1..ebf976a 100644 --- a/Documentation/devicetree/bindings/arm/gic.txt +++ b/Documentation/devicetree/bindings/arm/gic.txt @@ -96,3 +96,56 @@ Example: <0x2c006000 0x2000>; interrupts = <1 9 0xf04>; }; + + +* GICv2m extension for MSI/MSI-x support (Optional) + +Certain revisions of GIC-400 supports MSI/MSI-x via V2M register frame(s). +This is enabled by specifying v2m sub-node(s). + +Required properties: + +- compatible : The value here should contain "arm,gic-v2m-frame". + +- msi-controller : Identifies the node as an MSI controller. + +- reg : GICv2m MSI interface register base and size + +Optional properties: + +- arm,msi-base-spi : When the MSI_TYPER register contains an incorrect + value, this property should contain the SPI base of + the MSI frame, overriding the HW value. + +- arm,msi-num-spis : When the MSI_TYPER register contains an incorrect + value, this property should contain the number of + SPIs assigned to the frame, overriding the HW value. + +Example: + + interrupt-controller@e1101000 { + compatible = "arm,gic-400"; + #interrupt-cells = <3>; + #address-cells = <2>; + #size-cells = <2>; + interrupt-controller; + interrupts = <1 8 0xf04>; + ranges = <0 0 0 0xe1100000 0 0x100000>; + reg = <0x0 0xe1110000 0 0x01000>, + <0x0 0xe112f000 0 0x02000>, + <0x0 0xe1140000 0 0x10000>, + <0x0 0xe1160000 0 0x10000>; + v2m0: v2m@0x8000 { + compatible = "arm,gic-v2m-frame"; + msi-controller; + reg = <0x0 0x80000 0 0x1000>; + }; + + .... + + v2mN: v2m@0x9000 { + compatible = "arm,gic-v2m-frame"; + msi-controller; + reg = <0x0 0x90000 0 0x1000>; + }; + }; diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index cde2f72..cbcde2d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -12,6 +12,7 @@ config ARM64 select ARM_ARCH_TIMER select ARM_GIC select AUDIT_ARCH_COMPAT_GENERIC + select ARM_GIC_V2M select ARM_GIC_V3 select BUILDTIME_EXTABLE_SORT select CLONE_BACKWARDS diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 2a48e0a..39ce065 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -8,6 +8,11 @@ config ARM_GIC select IRQ_DOMAIN_HIERARCHY select MULTI_IRQ_HANDLER +config ARM_GIC_V2M + bool + depends on ARM_GIC + depends on PCI && PCI_MSI + config GIC_NON_BANKED bool diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 73052ba..3bda951 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_ARCH_SUNXI) += irq-sun4i.o obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi-nmi.o obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o obj-$(CONFIG_ARM_GIC) += irq-gic.o irq-gic-common.o +obj-$(CONFIG_ARM_GIC_V2M) += irq-gic-v2m.o obj-$(CONFIG_ARM_GIC_V3) += irq-gic-v3.o irq-gic-common.o obj-$(CONFIG_ARM_NVIC) += irq-nvic.o obj-$(CONFIG_ARM_VIC) += irq-vic.o diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c new file mode 100644 index 0000000..d82b668 --- /dev/null +++ b/drivers/irqchip/irq-gic-v2m.c @@ -0,0 +1,395 @@ +/* + * ARM GIC v2m MSI(-X) support + * Support for Message Signaled Interrupts for systems that + * implement ARM Generic Interrupt Controller: GICv2m. + * + * Copyright (C) 2014 Advanced Micro Devices, Inc. + * Authors: Suravee Suthikulpanit + * Harish Kasiviswanathan + * Brandon Anderson + * + * 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. + */ + +#define pr_fmt(fmt) "GICv2m: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "irqchip.h" +#include "irq-gic-v2m.h" + +/* +* MSI_TYPER: +* [31:26] Reserved +* [25:16] lowest SPI assigned to MSI +* [15:10] Reserved +* [9:0] Numer of SPIs assigned to MSI +*/ +#define V2M_MSI_TYPER 0x008 +#define V2M_MSI_TYPER_BASE_SHIFT 16 +#define V2M_MSI_TYPER_BASE_MASK 0x3FF +#define V2M_MSI_TYPER_NUM_MASK 0x3FF +#define V2M_MSI_SETSPI_NS 0x040 +#define V2M_MIN_SPI 32 +#define V2M_MAX_SPI 1019 + +#define V2M_MSI_TYPER_BASE_SPI(x) \ + (((x) >> V2M_MSI_TYPER_BASE_SHIFT) & V2M_MSI_TYPER_BASE_MASK) + +#define V2M_MSI_TYPER_NUM_SPI(x) ((x) & V2M_MSI_TYPER_NUM_MASK) + +struct v2m_data { + struct list_head list; + spinlock_t msi_cnt_lock; + struct msi_chip msi_chip; + struct resource res; /* GICv2m resource */ + void __iomem *base; /* GICv2m virt address */ + unsigned int spi_start; /* The SPI number that MSIs start */ + unsigned int nr_spis; /* The number of SPIs for MSIs */ + unsigned long *bm; /* MSI vector bitmap */ + struct irq_domain *domain; +}; + +static struct irq_chip v2m_chip; + +/* + * alloc_msi_irq - Allocate MSIs from available MSI bitmap. + * @data: Pointer to v2m_data + * @nvec: Number of interrupts to allocate + * @irq: Pointer to the allocated irq + * + * Allocates interrupts only if the contiguous range of MSIs + * with specified nvec are available. Otherwise return the number + * of available interrupts. If none are available, then returns -ENOENT. + */ +static int alloc_msi_irq(struct v2m_data *data, int nvec, int *irq) +{ + int size = data->nr_spis; + int next = size, i = nvec, ret; + + /* We should never allocate more than available nr_spis */ + if (i >= size) + i = size; + + spin_lock(&data->msi_cnt_lock); + + for (; i > 0; i--) { + next = bitmap_find_next_zero_area(data->bm, + size, 0, i, 0); + if (next < size) + break; + } + + if (i != nvec) { + ret = i ? : -ENOENT; + } else { + bitmap_set(data->bm, next, nvec); + *irq = data->spi_start + next; + ret = 0; + } + + spin_unlock(&data->msi_cnt_lock); + + return ret; +} + +static void gicv2m_teardown_msi_irq(struct msi_chip *chip, unsigned int irq) +{ + int pos; + struct v2m_data *data = container_of(chip, struct v2m_data, msi_chip); + + spin_lock(&data->msi_cnt_lock); + + pos = irq - data->spi_start; + if (pos >= 0 && pos < data->nr_spis) + bitmap_clear(data->bm, pos, 1); + + spin_unlock(&data->msi_cnt_lock); +} + +static int gicv2m_setup_msi_irq(struct msi_chip *chip, struct pci_dev *pdev, + struct msi_desc *desc) +{ + int hwirq = 0, virq, avail; + struct v2m_data *v2m = container_of(chip, struct v2m_data, msi_chip); + + if (!desc) { + dev_err(&pdev->dev, + "MSI setup failed. Invalid msi descriptor\n"); + return -EINVAL; + } + + avail = alloc_msi_irq(v2m, 1, &hwirq); + if (avail != 0) { + dev_err(&pdev->dev, + "MSI setup failed. Cannnot allocate IRQ\n"); + return -ENOSPC; + } + + virq = __irq_domain_alloc_irqs(v2m->domain, hwirq, + 1, NUMA_NO_NODE, v2m, true); + if (virq < 0) + return -EINVAL; + + irq_domain_set_hwirq_and_chip(v2m->domain, virq, hwirq, + &v2m_chip, v2m); + + + irq_set_msi_desc(hwirq, desc); + irq_set_irq_type(hwirq, IRQ_TYPE_EDGE_RISING); + + return 0; +} + +static int gicv2m_domain_activate(struct irq_domain *domain, + struct irq_data *data) +{ + struct msi_msg msg; + struct v2m_data *v2m; + phys_addr_t addr; + + v2m = container_of(data->chip_data, struct v2m_data, msi_chip); + addr = v2m->res.start + V2M_MSI_SETSPI_NS; + + msg.address_hi = (u32)(addr >> 32); + msg.address_lo = (u32)(addr); + msg.data = data->irq; + write_msi_msg(data->irq, &msg); + + return 0; +} + +static int gicv2m_domain_deactivate(struct irq_domain *domain, + struct irq_data *data) +{ + struct msi_msg msg; + + memset(&msg, 0, sizeof(msg)); + write_msi_msg(data->irq, &msg); + + return 0; +} + +static int gicv2m_domain_alloc(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + int i, ret, irq; + + for (i = 0; i < nr_irqs; i++) { + irq = virq + i; + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + irq_set_chip_and_handler_name(irq, &v2m_chip, + handle_fasteoi_irq, v2m_chip.name); + } + + ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, NULL); + if (ret < 0) + pr_err("Failed to allocate parent IRQ domain\n"); + + return ret; +} + +static void gicv2m_domain_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + int i, irq; + + for (i = 0; i < nr_irqs; i++) { + irq = virq + i; + irq_set_handler(irq, NULL); + irq_domain_set_hwirq_and_chip(d, irq, 0, NULL, NULL); + } + + irq_domain_free_irqs_parent(d, virq, nr_irqs); +} + +static bool is_msi_spi_valid(u32 base, u32 num) +{ + if (base < V2M_MIN_SPI) { + pr_err("Invalid MSI base SPI (base:%u)\n", base); + return false; + } + + if ((num == 0) || (base + num > V2M_MAX_SPI)) { + pr_err("Number of SPIs (%u) exceed maximum (%u)\n", + num, V2M_MAX_SPI - V2M_MIN_SPI + 1); + return false; + } + + return true; +} + +static void gicv2m_mask_irq(struct irq_data *d) +{ + irq_chip_mask_parent(d); + if (d->msi_desc) + mask_msi_irq(d); +} + +static void gicv2m_unmask_irq(struct irq_data *d) +{ + irq_chip_unmask_parent(d); + if (d->msi_desc) + unmask_msi_irq(d); +} + +static struct irq_chip v2m_chip = { + .name = "GICv2m", + .irq_mask = gicv2m_mask_irq, + .irq_unmask = gicv2m_unmask_irq, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_type = irq_chip_set_type_parent, + +#ifdef CONFIG_SMP + .irq_set_affinity = irq_chip_set_affinity_parent, +#endif +}; + +static const struct irq_domain_ops gicv2m_domain_ops = { + .alloc = gicv2m_domain_alloc, + .free = gicv2m_domain_free, + .activate = gicv2m_domain_activate, + .deactivate = gicv2m_domain_deactivate, +}; + +static int __init +gicv2m_init_one(struct device_node *node, + struct v2m_data **v, + struct irq_domain *parent) +{ + int ret; + struct v2m_data *v2m; + + *v = kzalloc(sizeof(struct v2m_data), GFP_KERNEL); + if (!*v) { + pr_err("Failed to allocate struct v2m_data.\n"); + return -ENOMEM; + } + + v2m = *v; + v2m->msi_chip.owner = THIS_MODULE; + v2m->msi_chip.of_node = node; + v2m->msi_chip.setup_irq = gicv2m_setup_msi_irq; + v2m->msi_chip.teardown_irq = gicv2m_teardown_msi_irq; + ret = of_address_to_resource(node, 0, &v2m->res); + if (ret) { + pr_err("Failed to allocate v2m resource.\n"); + goto err_out; + } + + v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res)); + if (!v2m->base) { + pr_err("Failed to map GICv2m resource\n"); + ret = -EINVAL; + goto err_out; + } + + ret = of_pci_msi_chip_add(&v2m->msi_chip); + if (ret) { + pr_info("Failed to add msi_chip.\n"); + goto err_out; + } + + if (!of_property_read_u32(node, "arm,msi-base-spi", &v2m->spi_start) && + !of_property_read_u32(node, "arm,msi-num-spis", &v2m->nr_spis)) { + pr_info("Overriding V2M MSI_TYPER (base:%u, num:%u)\n", + v2m->spi_start, v2m->nr_spis); + } else { + u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER); + + v2m->spi_start = V2M_MSI_TYPER_BASE_SPI(typer); + v2m->nr_spis = V2M_MSI_TYPER_NUM_SPI(typer); + } + + if (!is_msi_spi_valid(v2m->spi_start, v2m->nr_spis)) { + ret = -EINVAL; + goto err_out; + } + + v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis), + GFP_KERNEL); + if (!v2m->bm) { + pr_err("Failed to allocate MSI bitmap\n"); + ret = -ENOMEM; + goto err_out; + } + + v2m->domain = irq_domain_add_simple(node, v2m->nr_spis, v2m->spi_start, + &gicv2m_domain_ops, v2m); + if (!v2m->domain) { + pr_err("Failed to create GICv2m domain\n"); + ret = -EINVAL; + goto err_out; + } + + v2m->domain->parent = parent; + + spin_lock_init(&v2m->msi_cnt_lock); + + pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", node->name, + (unsigned long)v2m->res.start, (unsigned long)v2m->res.end, + v2m->spi_start, (v2m->spi_start + v2m->nr_spis)); + + return 0; +err_out: + of_pci_msi_chip_remove(&v2m->msi_chip); + if (v2m->base) + iounmap(v2m->base); + if (v2m->bm) + kzfree(v2m->bm); + kfree(v2m); + return ret; +} + +int __init gicv2m_of_init(struct device_node *node, + struct irq_domain *parent, + struct list_head *v2m_list) +{ + int ret = 0; + struct v2m_data *v2m; + struct device_node *child = NULL; + + INIT_LIST_HEAD(v2m_list); + + for (;;) { + child = of_get_next_child(node, child); + if (!child) + break; + + if (!of_device_is_compatible(child, "arm,gic-v2m-frame")) + continue; + + if (!of_find_property(child, "msi-controller", NULL)) + continue; + + ret = gicv2m_init_one(child, &v2m, parent); + if (ret) { + of_node_put(node); + break; + } + + list_add_tail(&v2m->list, v2m_list); + } + + if (ret && list_empty(v2m_list)) { + pr_warn("Warning: Failed to enable GICv2m support.\n"); + return -EINVAL; + } + + return ret; +} diff --git a/drivers/irqchip/irq-gic-v2m.h b/drivers/irqchip/irq-gic-v2m.h new file mode 100644 index 0000000..b5ae787 --- /dev/null +++ b/drivers/irqchip/irq-gic-v2m.h @@ -0,0 +1,7 @@ +#ifndef _IRQ_GIC_V2M_H_ +#define _IRQ_GIC_V2M_H_ + +extern int gicv2m_of_init(struct device_node *node, struct irq_domain *parent, + struct list_head *v2m_list) __init; + +#endif /* _IRQ_GIC_V2M_H_ */ diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index a99c211..4069eb3 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -46,6 +46,7 @@ #include #include "irq-gic-common.h" +#include "irq-gic-v2m.h" #include "irqchip.h" union gic_base { @@ -68,6 +69,9 @@ struct gic_chip_data { #ifdef CONFIG_GIC_NON_BANKED void __iomem *(*get_base)(union gic_base *); #endif +#ifdef CONFIG_ARM_GIC_V2M + struct list_head v2m_list; +#endif }; static DEFINE_RAW_SPINLOCK(irq_controller_lock); @@ -843,10 +847,14 @@ static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int type = IRQ_TYPE_NONE; struct of_phandle_args *irq_data = arg; - ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args, - irq_data->args_count, &hwirq, &type); - if (ret) - return ret; + if (irq_data) { + ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args, + irq_data->args_count, &hwirq, &type); + if (ret) + return ret; + } else { + hwirq = virq; + } for (i = 0; i < nr_irqs; i++) gic_irq_domain_map(domain, virq+i, hwirq+i); @@ -1055,6 +1063,11 @@ gic_of_init(struct device_node *node, struct device_node *parent) irq = irq_of_parse_and_map(node, 0); gic_cascade_irq(gic_cnt, irq); } + + if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) + gicv2m_of_init(node, gic_data[gic_cnt].domain, + &gic_data[gic_cnt].v2m_list); + gic_cnt++; return 0; }