Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752596AbaB0NWY (ORCPT ); Thu, 27 Feb 2014 08:22:24 -0500 Received: from mail-yk0-f171.google.com ([209.85.160.171]:63102 "EHLO mail-yk0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752359AbaB0NWU (ORCPT ); Thu, 27 Feb 2014 08:22:20 -0500 MIME-Version: 1.0 X-Originating-IP: [78.145.137.174] In-Reply-To: <1393506402-11474-2-git-send-email-Liviu.Dudau@arm.com> References: <1393506402-11474-1-git-send-email-Liviu.Dudau@arm.com> <1393506402-11474-2-git-send-email-Liviu.Dudau@arm.com> Date: Thu, 27 Feb 2014 13:22:19 +0000 Message-ID: Subject: Re: [PATCH v2 1/4] pci: OF: Fix the conversion of IO ranges into IO resources. From: Andrew Murray To: Liviu Dudau Cc: linux-pci , Bjorn Helgaas , Catalin Marinas , Will Deacon , linaro-kernel , LKML , "devicetree@vger.kernel.org" , LAKML Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27 February 2014 13:06, Liviu Dudau wrote: > > The ranges property for a host bridge controller in DT describes > the mapping between the PCI bus address and the CPU physical address. > The resources framework however expects that the IO resources start > at a pseudo "port" address 0 (zero) and have a maximum size of 64kb. Is this just in the case of ARM? (I've tried to keep up with the conversation, but apologies if I've misunderstood). > The conversion from pci ranges to resources failed to take that into > account. > > In the process move the function into drivers/of/address.c as it > now depends on pci_address_to_pio() code. > > Signed-off-by: Liviu Dudau > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index 1a54f1f..7cf2b16 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -719,3 +719,34 @@ void __iomem *of_iomap(struct device_node *np, int index) > return ioremap(res.start, resource_size(&res)); > } > EXPORT_SYMBOL(of_iomap); > + > +/** > + * of_pci_range_to_resource - Create a resource from an of_pci_range > + * @range: the PCI range that describes the resource > + * @np: device node where the range belongs to > + * @res: pointer to a valid resource that will be updated to > + * reflect the values contained in the range. > + * Note that if the range is an IO range, the resource will be converted > + * using pci_address_to_pio() which can fail if it is called to early or > + * if the range cannot be matched to any host bridge IO space. > + */ > +void of_pci_range_to_resource(struct of_pci_range *range, > + struct device_node *np, struct resource *res) > +{ > + res->flags = range->flags; > + if (res->flags & IORESOURCE_IO) { > + unsigned long port; > + port = pci_address_to_pio(range->pci_addr); Is this likely to break existing users of of_pci_range_to_resource? For example arch/mips: IO_SPACE_LIMIT defaults to 0xffff and there is no overridden implementation for pci_address_to_pio, therefore this will set res->start to OF_BAD_ADDR whereas previously it would have been the CPU address for I/O (assuming the cpu_addr was previously > 64K). I have no idea if I/O previously worked for mips, but this patch seems to change that behavior. It may be a similar story for microblaze and powerpc. Andrew Murray > + if (port == (unsigned long)-1) { > + res->start = (resource_size_t)OF_BAD_ADDR; > + res->end = (resource_size_t)OF_BAD_ADDR; > + return; > + } > + res->start = port; > + } else { > + res->start = range->cpu_addr; > + } > + res->end = res->start + range->size - 1; > + res->parent = res->child = res->sibling = NULL; > + res->name = np->full_name; > +} > diff --git a/include/linux/of_address.h b/include/linux/of_address.h > index 5f6ed6b..a667762 100644 > --- a/include/linux/of_address.h > +++ b/include/linux/of_address.h > @@ -23,17 +23,8 @@ struct of_pci_range { > #define for_each_of_pci_range(parser, range) \ > for (; of_pci_range_parser_one(parser, range);) > > -static inline void of_pci_range_to_resource(struct of_pci_range *range, > - struct device_node *np, > - struct resource *res) > -{ > - res->flags = range->flags; > - res->start = range->cpu_addr; > - res->end = range->cpu_addr + range->size - 1; > - res->parent = res->child = res->sibling = NULL; > - res->name = np->full_name; > -} > - > +extern void of_pci_range_to_resource(struct of_pci_range *range, > + struct device_node *np, struct resource *res); > /* Translate a DMA address from device space to CPU space */ > extern u64 of_translate_dma_address(struct device_node *dev, > const __be32 *in_addr); > -- > 1.9.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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/