From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruce Richardson Subject: Re: [PATCH] eal: map io resources for non x86 architectures Date: Wed, 16 Dec 2015 13:15:41 +0000 Message-ID: <20151216131540.GD10020@bricha3-MOBL3> References: <1450269064-23608-1-git-send-email-david.marchand@6wind.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: dev@dpdk.org To: David Marchand Return-path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id F08E39E7 for ; Wed, 16 Dec 2015 14:15:51 +0100 (CET) Content-Disposition: inline In-Reply-To: <1450269064-23608-1-git-send-email-david.marchand@6wind.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Wed, Dec 16, 2015 at 01:31:04PM +0100, David Marchand wrote: > x86 requires a special set of instructions to access ioports, but other > architectures let you remap io resources. > So let eal remap io resources by accepting IORESOURCE_IO flag for > architectures other than x86. > > Signed-off-by: David Marchand > --- > lib/librte_eal/common/include/rte_pci.h | 3 ++- > lib/librte_eal/linuxapp/eal/eal_pci.c | 21 +++++++++++++++------ > 2 files changed, 17 insertions(+), 7 deletions(-) > > diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h > index 334c12e..8aaab4a 100644 > --- a/lib/librte_eal/common/include/rte_pci.h > +++ b/lib/librte_eal/common/include/rte_pci.h > @@ -105,7 +105,8 @@ extern struct pci_device_list pci_device_list; /**< Global list of PCI devices. > /** Nb. of values in PCI resource format. */ > #define PCI_RESOURCE_FMT_NVAL 3 > > -/** IO resource type: memory address space */ > +/** IO resource type: */ > +#define IORESOURCE_IO 0x00000100 > #define IORESOURCE_MEM 0x00000200 > > /** > diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c > index bc5b5be..9c4651d 100644 > --- a/lib/librte_eal/linuxapp/eal/eal_pci.c > +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c > @@ -236,12 +236,21 @@ pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev) > goto error; > } > > - if (flags & IORESOURCE_MEM) { > - dev->mem_resource[i].phys_addr = phys_addr; > - dev->mem_resource[i].len = end_addr - phys_addr + 1; > - /* not mapped for now */ > - dev->mem_resource[i].addr = NULL; > - } > + /* we only care about IORESOURCE_IO or IORESOURCE_MEM */ > + if (!(flags & IORESOURCE_IO) && > + !(flags & IORESOURCE_MEM)) > + continue; > + > +#if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686) > + /* x86 can not remap ioports, so skip it, remapping code will > + * look at dev->mem_resource[i].phys_addr == 0 and skip it */ > + if (flags & IORESOURCE_IO) > + continue; > +#endif As a tangential comment: We maybe could look to make certain preprocessor defines available as C globals as well. There is no reason that the ifdef here could not be implemented as a runtime check in C code. /Bruce