From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp07.in.ibm.com (e28smtp07.in.ibm.com [122.248.162.7]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 56B1F1A0294 for ; Tue, 10 Jun 2014 11:57:11 +1000 (EST) Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 10 Jun 2014 07:27:09 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id 18F193940049 for ; Tue, 10 Jun 2014 07:27:07 +0530 (IST) Received: from d28av04.in.ibm.com (d28av04.in.ibm.com [9.184.220.66]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s5A1vJ6l46792840 for ; Tue, 10 Jun 2014 07:27:19 +0530 Received: from d28av04.in.ibm.com (localhost [127.0.0.1]) by d28av04.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s5A1v6CK013243 for ; Tue, 10 Jun 2014 07:27:06 +0530 From: Wei Yang To: benh@au1.ibm.com Subject: [RFC PATCH V3 08/17] PCI: Add weak pcibios_sriov_resource_size() interface Date: Tue, 10 Jun 2014 09:56:30 +0800 Message-Id: <1402365399-5121-9-git-send-email-weiyang@linux.vnet.ibm.com> In-Reply-To: <1402365399-5121-1-git-send-email-weiyang@linux.vnet.ibm.com> References: <1402365399-5121-1-git-send-email-weiyang@linux.vnet.ibm.com> Cc: Wei Yang , linux-pci@vger.kernel.org, gwshan@linux.vnet.ibm.com, qiudayu@linux.vnet.ibm.com, bhelgaas@google.com, yan@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , When retrieving sriov resource size in pci_sriov_resource_size(), it will divide the total IOV resource size with the totalVF number. This is true for most cases, while may not be correct on some specific platform. For example on powernv platform, in order to fix the IOV BAR into a hardware alignment, the IOV resource size would be expended. This means the original method couldn't work. This patch introduces a weak pcibios_sriov_resource_size() interface, which gives platform a chance to implement specific method to calculate the sriov resource size. Signed-off-by: Wei Yang --- drivers/pci/iov.c | 27 +++++++++++++++++++++++++-- include/linux/pci.h | 3 +++ 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index cc87773..9fd4648 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -45,6 +45,30 @@ static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) pci_remove_bus(virtbus); } +resource_size_t __weak pcibios_sriov_resource_size(struct pci_dev *dev, int resno) +{ + return 0; +} + +resource_size_t pci_sriov_resource_size(struct pci_dev *dev, int resno) +{ + u64 size; + struct pci_sriov *iov; + + if (!dev->is_physfn) + return 0; + + size = pcibios_sriov_resource_size(dev, resno); + if (size != 0) + return size; + + iov = dev->sriov; + size = resource_size(dev->resource + resno); + do_div(size, iov->total_VFs); + + return size; +} + static int virtfn_add(struct pci_dev *dev, int id, int reset) { int i; @@ -81,8 +105,7 @@ 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); + size = pci_sriov_resource_size(dev, i + PCI_IOV_RESOURCES); 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]); diff --git a/include/linux/pci.h b/include/linux/pci.h index ddb1ca0..315c150 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1637,6 +1637,7 @@ int pci_num_vf(struct pci_dev *dev); int pci_vfs_assigned(struct pci_dev *dev); int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_get_totalvfs(struct pci_dev *dev); +resource_size_t pci_sriov_resource_size(struct pci_dev *dev, int resno); #else static inline int pci_iov_virtfn_bus(struct pci_dev *dev, int id) { @@ -1658,6 +1659,8 @@ static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) { return 0; } static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) { return 0; } +static inline resource_size_t pci_sriov_resource_size(struct pci_dev *dev, int resno) +{ return -1; } #endif #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE) -- 1.7.9.5