Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932096AbbEZMyh (ORCPT ); Tue, 26 May 2015 08:54:37 -0400 Received: from mail-pa0-f49.google.com ([209.85.220.49]:34023 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753037AbbEZMxO (ORCPT ); Tue, 26 May 2015 08:53:14 -0400 From: Hanjun Guo To: Bjorn Helgaas , Arnd Bergmann , Catalin Marinas , Will Deacon , "Rafael J. Wysocki" Cc: Jiang Liu , Liviu Dudau , Thomas Gleixner , Yijing Wang , Lorenzo Pieralisi , Tomasz Nowicki , Suravee Suthikulpanit , Mark Salter , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org, Hanjun Guo Subject: [PATCH 11/11] ARM64 / PCI / ACPI: support for ACPI based PCI hostbridge init Date: Tue, 26 May 2015 20:49:24 +0800 Message-Id: <1432644564-24746-12-git-send-email-hanjun.guo@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1432644564-24746-1-git-send-email-hanjun.guo@linaro.org> References: <1432644564-24746-1-git-send-email-hanjun.guo@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10091 Lines: 382 Based on Jiang Liu's common interface to support PCI host bridge init and refactoring of MMCONFIG, this patch using information from ACPI MCFG table and IO/irq resources from _CRS to init ARM64 PCI hostbridge, then PCI will work on ARM64. This patch is based on Mark Salter and Tomasz Nowicki's work. Signed-off-by: Hanjun Guo Tested-by: Suravee Suthikulpanit CC: Arnd Bergmann CC: Catalin Marinas CC: Liviu Dudau CC: Lorenzo Pieralisi CC: Will Deacon --- arch/arm64/Kconfig | 7 ++ arch/arm64/kernel/pci.c | 245 +++++++++++++++++++++++++++++++++++++++++++++--- drivers/pci/pci.c | 26 +++-- 3 files changed, 257 insertions(+), 21 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 9b80428..8e4b789 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -276,6 +276,13 @@ config PCI_DOMAINS_GENERIC config PCI_SYSCALL def_bool PCI +config PCI_MMCONFIG + def_bool y + select PCI_ECAM + select HAVE_PCI_ECAM + select GENERIC_PCI_ECAM + depends on ACPI + source "drivers/pci/Kconfig" source "drivers/pci/pcie/Kconfig" source "drivers/pci/hotplug/Kconfig" diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index 4095379..d1629dc 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -11,12 +11,15 @@ */ #include +#include #include #include #include #include +#include #include #include +#include #include #include @@ -43,31 +46,251 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res, */ int pcibios_add_device(struct pci_dev *dev) { - dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); + if (acpi_disabled) + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); return 0; } +#ifdef CONFIG_ACPI +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + struct pci_controller *sd = bridge->bus->sysdata; + + ACPI_COMPANION_SET(&bridge->dev, sd->companion); + return 0; +} + +void pcibios_add_bus(struct pci_bus *bus) +{ + acpi_pci_add_bus(bus); +} + +void pcibios_remove_bus(struct pci_bus *bus) +{ + acpi_pci_remove_bus(bus); +} + +int pcibios_enable_irq(struct pci_dev *dev) +{ + if (!pci_dev_msi_enabled(dev)) + acpi_pci_irq_enable(dev); + return 0; +} + +int pcibios_disable_irq(struct pci_dev *dev) +{ + if (!pci_dev_msi_enabled(dev)) + acpi_pci_irq_disable(dev); + return 0; +} + +int pcibios_enable_device(struct pci_dev *dev, int bars) +{ + int err; + + err = pci_enable_resources(dev, bars); + if (err < 0) + return err; + + return pcibios_enable_irq(dev); +} + +static int __init pcibios_assign_resources(void) +{ + struct pci_bus *root_bus; + + if (acpi_disabled) + return 0; + + list_for_each_entry(root_bus, &pci_root_buses, node) { + pcibios_resource_survey_bus(root_bus); + pci_assign_unassigned_root_bus_resources(root_bus); + } + return 0; +} /* - * raw_pci_read/write - Platform-specific PCI config space access. + * fs_initcall comes after subsys_initcall, so we know acpi scan + * has run. */ -int raw_pci_read(unsigned int domain, unsigned int bus, - unsigned int devfn, int reg, int len, u32 *val) +fs_initcall(pcibios_assign_resources); + +static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 *value) { - return -ENXIO; + return raw_pci_read(pci_domain_nr(bus), bus->number, + devfn, where, size, value); } -int raw_pci_write(unsigned int domain, unsigned int bus, - unsigned int devfn, int reg, int len, u32 val) +static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 value) { - return -ENXIO; + return raw_pci_write(pci_domain_nr(bus), bus->number, + devfn, where, size, value); } -#ifdef CONFIG_ACPI +struct pci_ops pci_root_ops = { + .read = pci_read, + .write = pci_write, +}; + +struct pci_root_info { + struct acpi_pci_root_info common; +#ifdef CONFIG_PCI_MMCONFIG + bool mcfg_added; + u8 start_bus; + u8 end_bus; +#endif +}; + +#ifdef CONFIG_PCI_MMCONFIG +static int pci_add_mmconfig_region(struct acpi_pci_root_info *ci) +{ + struct pci_mmcfg_region *cfg; + struct pci_root_info *info; + struct acpi_pci_root *root = ci->root; + int err, seg = ci->controller.segment; + + info = container_of(ci, struct pci_root_info, common); + info->start_bus = (u8)root->secondary.start; + info->end_bus = (u8)root->secondary.end; + info->mcfg_added = false; + + rcu_read_lock(); + cfg = pci_mmconfig_lookup(seg, info->start_bus); + rcu_read_unlock(); + if (cfg) + return 0; + + cfg = pci_mmconfig_alloc(seg, info->start_bus, info->end_bus, + root->mcfg_addr); + if (!cfg) + return -ENOMEM; + + err = pci_mmconfig_inject(cfg); + if (!err) + info->mcfg_added = true; + + return err; +} + +static void pci_remove_mmconfig_region(struct acpi_pci_root_info *ci) +{ + struct pci_root_info *info; + + info = container_of(ci, struct pci_root_info, common); + if (info->mcfg_added) { + pci_mmconfig_delete(ci->controller.segment, info->start_bus, + info->end_bus); + info->mcfg_added = false; + } +} +#else +static int pci_add_mmconfig_region(struct acpi_pci_root_info *ci) +{ + return 0; +} + +static void pci_remove_mmconfig_region(struct acpi_pci_root_info *ci) { } +#endif + +static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci) +{ + return pci_add_mmconfig_region(ci); +} + +static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci) +{ + struct pci_root_info *info; + + info = container_of(ci, struct pci_root_info, common); + pci_remove_mmconfig_region(ci); + kfree(info); +} + +static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci, + int status) +{ + struct resource_entry *entry, *tmp; + + resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { + struct resource *res = entry->res; + + /* + * Special handling for ARM IO range + * TODO: need to move pci_register_io_range() function out + * of drivers/of/address.c for both used by DT and ACPI + */ + if (res->flags & IORESOURCE_IO) { + unsigned long port; + int err; + resource_size_t length = res->end - res->start; + + err = pci_register_io_range(res->start, length); + if (err) { + resource_list_destroy_entry(entry); + continue; + } + + port = pci_address_to_pio(res->start); + if (port == (unsigned long)-1) { + resource_list_destroy_entry(entry); + continue; + } + + res->start = port; + res->end = res->start + length - 1; + + if (pci_remap_iospace(res, res->start) < 0) + resource_list_destroy_entry(entry); + } + } + + return status; +} + +static struct acpi_pci_root_ops acpi_pci_root_ops = { + .pci_ops = &pci_root_ops, + .init_info = pci_acpi_root_init_info, + .release_info = pci_acpi_root_release_info, + .prepare_resources = pci_acpi_root_prepare_resources, +}; + /* Root bridge scanning */ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) { - /* TODO: Should be revisited when implementing PCI on ACPI */ - return NULL; + struct pci_root_info *info; + int node; + int domain = root->segment; + int busnum = root->secondary.start; + struct pci_bus *bus; + + if (domain && !pci_domains_supported) { + pr_warn("PCI %04x:%02x: multiple domains not supported.\n", + domain, busnum); + return NULL; + } + + node = acpi_get_node(root->device->handle); + info = kzalloc_node(sizeof(*info), GFP_KERNEL, node); + if (!info) { + dev_err(&root->device->dev, "pci_bus %04x:%02x: ignored (out of memory)\n", + domain, busnum); + return NULL; + } + + bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &info->common); + + /* After the PCI-E bus has been walked and all devices discovered, + * configure any settings of the fabric that might be necessary. + */ + if (bus) { + struct pci_bus *child; + + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + } + + return bus; } #endif diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index acc4b6e..0268a1d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include "pci.h" @@ -4509,7 +4510,7 @@ int pci_get_new_domain_nr(void) void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) { static int use_dt_domains = -1; - int domain = of_get_pci_domain_nr(parent->of_node); + int domain; /* * Check DT domain and use_dt_domains values. @@ -4537,17 +4538,22 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) * invalidating the domain value (domain = -1) and printing a * corresponding error. */ - if (domain >= 0 && use_dt_domains) { - use_dt_domains = 1; - } else if (domain < 0 && use_dt_domains != 1) { - use_dt_domains = 0; - domain = pci_get_new_domain_nr(); + if (acpi_disabled) { + domain = of_get_pci_domain_nr(parent->of_node); + if (domain >= 0 && use_dt_domains) { + use_dt_domains = 1; + } else if (domain < 0 && use_dt_domains != 1) { + use_dt_domains = 0; + domain = pci_get_new_domain_nr(); + } else { + dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n", + parent->of_node->full_name); + domain = -1; + } } else { - dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n", - parent->of_node->full_name); - domain = -1; + struct pci_controller *sd = bus->sysdata; + domain = sd->segment; } - bus->domain_nr = domain; } #endif -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/