From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp07.au.ibm.com (e23smtp07.au.ibm.com [202.81.31.140]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 2E0781A02DC for ; Thu, 24 Jul 2014 16:22:41 +1000 (EST) Received: from /spool/local by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 24 Jul 2014 16:22:35 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id AF34D2CE8051 for ; Thu, 24 Jul 2014 16:22:36 +1000 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s6O5xhZu55574586 for ; Thu, 24 Jul 2014 15:59:43 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s6O6MZoo000749 for ; Thu, 24 Jul 2014 16:22:36 +1000 From: Wei Yang To: linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, bhelgaas@google.com, benh@au1.ibm.com, gwshan@linux.vnet.ibm.com, yan@linux.vnet.ibm.com, qiudayu@linux.vnet.ibm.com Subject: [PATCH V7 02/17] PCI/IOV: Get VF BAR size from hardware directly when platform needs Date: Thu, 24 Jul 2014 14:22:12 +0800 Message-Id: <1406182947-11302-3-git-send-email-weiyang@linux.vnet.ibm.com> In-Reply-To: <1406182947-11302-1-git-send-email-weiyang@linux.vnet.ibm.com> References: <1406182947-11302-1-git-send-email-weiyang@linux.vnet.ibm.com> Cc: Wei Yang List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Current implementation calculates VF BAR size from dividing the total size of IOV BAR by total VF number. It won't work on PowerNV platform because we're going to expand IOV BAR size for finely alignment. The patch enforces getting IOV BAR size from hardware and then calculate the VF BAR size based on that when platform wants so. Signed-off-by: Wei Yang --- drivers/pci/iov.c | 28 ++++++++++++++++++++++++---- include/linux/ioport.h | 1 + 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 7566238..ef1c546 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -55,6 +55,9 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset) struct resource *res; struct pci_sriov *iov = dev->sriov; struct pci_bus *bus; + struct resource tmp; + enum pci_bar_type type; + int reg; mutex_lock(&iov->dev->sriov->lock); bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id)); @@ -80,12 +83,29 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset) continue; virtfn->resource[i].name = pci_name(virtfn); virtfn->resource[i].flags = res->flags; - size = resource_size(res); - do_div(size, iov->total_VFs); + /* When res has IORESOURCE_ARCH, retrieve the IOV BAR size + * from hardware directly. + */ + if (res->flags & IORESOURCE_ARCH) { + reg = pci_iov_resource_bar(dev, i + PCI_IOV_RESOURCES, &type); + __pci_read_base(dev, type, &tmp, reg); + size = resource_size(&tmp); + /* When __pci_read_base fails, flags is set to 0. + * In this case, reset size to 0, which means the VF + * will not be enabled. + */ + if (!tmp.flags) + size = 0; + } else { + size = resource_size(res); + do_div(size, iov->total_VFs); + } virtfn->resource[i].start = res->start + size * id; virtfn->resource[i].end = virtfn->resource[i].start + size - 1; - rc = request_resource(res, &virtfn->resource[i]); - BUG_ON(rc); + if (resource_size(&virtfn->resource[i])) { + rc = request_resource(res, &virtfn->resource[i]); + BUG_ON(rc); + } } if (reset) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 5e3a906..de8b57c 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -48,6 +48,7 @@ struct resource { #define IORESOURCE_MEM_64 0x00100000 #define IORESOURCE_WINDOW 0x00200000 /* forwarded by bridge */ #define IORESOURCE_MUXED 0x00400000 /* Resource is software muxed */ +#define IORESOURCE_ARCH 0x00800000 /* Resource arch tagged */ #define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */ #define IORESOURCE_DISABLED 0x10000000 -- 1.7.9.5