Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755923AbaDGX6h (ORCPT ); Mon, 7 Apr 2014 19:58:37 -0400 Received: from mail-ig0-f169.google.com ([209.85.213.169]:32922 "EHLO mail-ig0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754665AbaDGX6e (ORCPT ); Mon, 7 Apr 2014 19:58:34 -0400 Date: Mon, 7 Apr 2014 17:58:30 -0600 From: Bjorn Helgaas To: Liviu Dudau Cc: linux-pci , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , linaro-kernel , Arnd Bergmann , LKML , "devicetree@vger.kernel.org" , LAKML , Tanmay Inamdar , Grant Likely Subject: Re: [PATCH v7 3/3] arm64: Add architecture support for PCI Message-ID: <20140407235830.GA9959@google.com> References: <1394811258-1500-1-git-send-email-Liviu.Dudau@arm.com> <1394811258-1500-4-git-send-email-Liviu.Dudau@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1394811258-1500-4-git-send-email-Liviu.Dudau@arm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 14, 2014 at 03:34:18PM +0000, Liviu Dudau wrote: > Use the generic host bridge functions to provide support for > PCI Express on arm64. There is no support for ISA memory. > > Signed-off-by: Liviu Dudau > Tested-by: Tanmay Inamdar > --- > arch/arm64/Kconfig | 19 +++- > arch/arm64/include/asm/Kbuild | 1 + > arch/arm64/include/asm/io.h | 3 +- > arch/arm64/include/asm/pci.h | 51 ++++++++++ > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/pci.c | 173 ++++++++++++++++++++++++++++++++ > 6 files changed, 246 insertions(+), 2 deletions(-) > create mode 100644 arch/arm64/include/asm/pci.h > create mode 100644 arch/arm64/kernel/pci.c > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 27bbcfc..d1c8568 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -62,7 +62,7 @@ config MMU > def_bool y > > config NO_IOPORT > - def_bool y > + def_bool y if !PCI > > config STACKTRACE_SUPPORT > def_bool y > @@ -134,6 +134,23 @@ menu "Bus support" > config ARM_AMBA > bool > > +config PCI > + bool "PCI support" > + help > + This feature enables support for PCIe bus system. If you say Y > + here, the kernel will include drivers and infrastructure code > + to support PCIe bus devices. > + > +config PCI_DOMAINS > + def_bool PCI > + > +config PCI_SYSCALL > + def_bool PCI > + > +source "drivers/pci/Kconfig" > +source "drivers/pci/pcie/Kconfig" > +source "drivers/pci/hotplug/Kconfig" > + > endmenu > > menu "Kernel Features" > diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild > index 71c53ec..46924bc 100644 > --- a/arch/arm64/include/asm/Kbuild > +++ b/arch/arm64/include/asm/Kbuild > @@ -26,6 +26,7 @@ generic-y += mman.h > generic-y += msgbuf.h > generic-y += mutex.h > generic-y += pci.h > +generic-y += pci-bridge.h > generic-y += poll.h > generic-y += posix_types.h > generic-y += resource.h > diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h > index 7846a6b..67463a5 100644 > --- a/arch/arm64/include/asm/io.h > +++ b/arch/arm64/include/asm/io.h > @@ -120,7 +120,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) > /* > * I/O port access primitives. > */ > -#define IO_SPACE_LIMIT 0xffff > +#define arch_has_dev_port() (1) > +#define IO_SPACE_LIMIT 0x1ffffff > #define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M)) > > static inline u8 inb(unsigned long addr) > diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h > new file mode 100644 > index 0000000..d93576f > --- /dev/null > +++ b/arch/arm64/include/asm/pci.h > @@ -0,0 +1,51 @@ > +#ifndef __ASM_PCI_H > +#define __ASM_PCI_H > +#ifdef __KERNEL__ > + > +#include > +#include > +#include > + > +#include > +#include > +#include > + > +#define PCIBIOS_MIN_IO 0x1000 > +#define PCIBIOS_MIN_MEM 0 > + > +struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus); > + > +/* > + * Set to 1 if the kernel should re-assign all PCI bus numbers > + */ > +#define pcibios_assign_all_busses() \ > + (pci_has_flag(PCI_REASSIGN_ALL_BUS)) > + > +/* > + * PCI address space differs from physical memory address space > + */ > +#define PCI_DMA_BUS_IS_PHYS (0) > + > +extern int isa_dma_bridge_buggy; > + > +#ifdef CONFIG_PCI > +static inline int pci_domain_nr(struct pci_bus *bus) > +{ > + struct pci_host_bridge *bridge = find_pci_host_bridge(bus); > + > + if (bridge) > + return bridge->domain_nr; > + > + return 0; > +} > + > +static inline int pci_proc_domain(struct pci_bus *bus) > +{ > + return 1; > +} > +#endif > + > +extern unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr); > + > +#endif /* __KERNEL__ */ > +#endif /* __ASM_PCI_H */ > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile > index 2d4554b..64fc479 100644 > --- a/arch/arm64/kernel/Makefile > +++ b/arch/arm64/kernel/Makefile > @@ -20,6 +20,7 @@ arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o > arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o > arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o > arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o > +arm64-obj-$(CONFIG_PCI) += pci.o > > obj-y += $(arm64-obj-y) vdso/ > obj-m += $(arm64-obj-m) > diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c > new file mode 100644 > index 0000000..9f29c9a > --- /dev/null > +++ b/arch/arm64/kernel/pci.c > @@ -0,0 +1,173 @@ > +/* > + * Code borrowed from powerpc/kernel/pci-common.c > + * > + * Copyright (C) 2003 Anton Blanchard , IBM > + * Copyright (C) 2014 ARM Ltd. > + * > + * 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 > +#include > +#include > +#include > +#include > + > +#include > + > +struct ioresource { > + struct list_head list; > + phys_addr_t start; > + resource_size_t size; > +}; > + > +static LIST_HEAD(io_list); > + > +int pci_register_io_range(phys_addr_t address, resource_size_t size) > +{ > + struct ioresource *res; > + resource_size_t allocated_size = 0; > + > + /* find if the range has not been already allocated */ > + list_for_each_entry(res, &io_list, list) { > + if (address >= res->start && > + address + size <= res->start + size) > + return 0; > + allocated_size += res->size; > + } > + > + /* range not already registered, check for space */ > + if (allocated_size + size > IO_SPACE_LIMIT) > + return -E2BIG; > + > + /* add the range in the list */ > + res = kzalloc(sizeof(*res), GFP_KERNEL); > + if (!res) > + return -ENOMEM; > + res->start = address; > + res->size = size; > + > + list_add_tail(&res->list, &io_list); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(pci_register_io_range); > + > +unsigned long pci_address_to_pio(phys_addr_t address) > +{ > + struct ioresource *res; > + > + list_for_each_entry(res, &io_list, list) { > + if (address >= res->start && > + address < res->start + res->size) { > + return res->start - address; > + } > + } > + > + return (unsigned long)-1; > +} > +EXPORT_SYMBOL_GPL(pci_address_to_pio); > + > +/* > + * Called after each bus is probed, but before its children are examined > + */ > +void pcibios_fixup_bus(struct pci_bus *bus) > +{ > + struct pci_dev *dev; > + struct resource *res; > + int i; > + > + if (!pci_is_root_bus(bus)) { > + pci_read_bridge_bases(bus); > + > + pci_bus_for_each_resource(bus, res, i) { > + if (!res || !res->flags || res->parent) > + continue; > + > + /* > + * If we are going to reassign everything, we can > + * shrink the P2P resource to have zero size to > + * save space > + */ > + if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { > + res->flags |= IORESOURCE_UNSET; > + res->start = 0; > + res->end = -1; > + continue; > + } > + } > + } Is there any other place we can put this? I'm trying to nuke pcibios_fixup_bus() because things like hotplug work better if we can do them in a per-device way rather than a per-bus way. > + > + list_for_each_entry(dev, &bus->devices, bus_list) { > + /* Ignore fully discovered devices */ > + if (dev->is_added) > + continue; > + > + set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); Do you really need this? pci_device_add() already contains the same line. > + > + /* Read default IRQs and fixup if necessary */ > + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); Could this be done in pcibios_add_device() or someplace similar? > + } > +} > +EXPORT_SYMBOL(pcibios_fixup_bus); > + > +/* > + * We don't have to worry about legacy ISA devices, so nothing to do here > + */ > +resource_size_t pcibios_align_resource(void *data, const struct resource *res, > + resource_size_t size, resource_size_t align) > +{ > + return res->start; > +} > + > +int pcibios_enable_device(struct pci_dev *dev, int mask) > +{ > + return pci_enable_resources(dev, mask); > +} There is already a weak default implementation of pcibios_enable_device() that does this, so you should be able to just drop this. > +#define IO_SPACE_PAGES ((IO_SPACE_LIMIT + 1) / PAGE_SIZE) > +static DECLARE_BITMAP(pci_iospace, IO_SPACE_PAGES); > + > +unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr) > +{ > + unsigned long start, len, virt_start; > + int err; > + > + if (res->end > IO_SPACE_LIMIT) > + return -EINVAL; > + > + /* > + * try finding free space for the whole size first, > + * fall back to 64K if not available > + */ > + len = resource_size(res); > + start = bitmap_find_next_zero_area(pci_iospace, IO_SPACE_PAGES, > + res->start / PAGE_SIZE, len / PAGE_SIZE, 0); > + if (start == IO_SPACE_PAGES && len > SZ_64K) { > + len = SZ_64K; > + start = 0; > + start = bitmap_find_next_zero_area(pci_iospace, IO_SPACE_PAGES, > + start, len / PAGE_SIZE, 0); > + } > + > + /* no 64K area found */ > + if (start == IO_SPACE_PAGES) > + return -ENOMEM; > + > + /* ioremap physical aperture to virtual aperture */ > + virt_start = start * PAGE_SIZE + (unsigned long)PCI_IOBASE; > + err = ioremap_page_range(virt_start, virt_start + len, > + phys_addr, __pgprot(PROT_DEVICE_nGnRE)); > + if (err) > + return err; > + > + bitmap_set(pci_iospace, start, len / PAGE_SIZE); > + > + /* return io_offset */ > + return start * PAGE_SIZE - res->start; > +} > -- > 1.9.0 > -- 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/