From patchwork Thu May 22 23:08:26 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 4227301 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9EEB2BF90B for ; Thu, 22 May 2014 23:12:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A38142037D for ; Thu, 22 May 2014 23:12:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76F842037A for ; Thu, 22 May 2014 23:12:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753227AbaEVXIf (ORCPT ); Thu, 22 May 2014 19:08:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28097 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752617AbaEVXIc (ORCPT ); Thu, 22 May 2014 19:08:32 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s4MN8RwK009414 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 22 May 2014 19:08:27 -0400 Received: from bling.home ([10.3.113.18]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id s4MN8RXO020625; Thu, 22 May 2014 19:08:27 -0400 Subject: [PATCH v4 10/16] iommu/amd: Use iommu_group_get_for_dev() From: Alex Williamson To: linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org Cc: Joerg Roedel , linux-kernel@vger.kernel.org, acooks@gmail.com, linux@horizon.com, bhelgaas@google.com, eddy0596@gmail.com Date: Thu, 22 May 2014 17:08:26 -0600 Message-ID: <20140522230826.2856.70391.stgit@bling.home> In-Reply-To: <20140522230230.2856.40017.stgit@bling.home> References: <20140522230230.2856.40017.stgit@bling.home> User-Agent: StGit/0.17-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The common iommu_group_get_for_dev() allows us to greatly simplify our group lookup for a new device. Also, since we insert IVRS aliases into the PCI DMA alias quirks, we should alway come up with the same results as the existing code. Signed-off-by: Alex Williamson Cc: Joerg Roedel --- drivers/iommu/amd_iommu.c | 164 +-------------------------------------- drivers/iommu/amd_iommu_types.h | 1 2 files changed, 5 insertions(+), 160 deletions(-) -- 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 diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index a73a7ed..ca85615 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -46,7 +46,6 @@ #include "amd_iommu_proto.h" #include "amd_iommu_types.h" #include "irq_remapping.h" -#include "pci.h" #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) @@ -133,9 +132,6 @@ static void free_dev_data(struct iommu_dev_data *dev_data) list_del(&dev_data->dev_data_list); spin_unlock_irqrestore(&dev_data_list_lock, flags); - if (dev_data->group) - iommu_group_put(dev_data->group); - kfree(dev_data); } @@ -264,167 +260,17 @@ static bool check_device(struct device *dev) return true; } -static struct pci_bus *find_hosted_bus(struct pci_bus *bus) -{ - while (!bus->self) { - if (!pci_is_root_bus(bus)) - bus = bus->parent; - else - return ERR_PTR(-ENODEV); - } - - return bus; -} - -#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF) - -static struct pci_dev *get_isolation_root(struct pci_dev *pdev) -{ - struct pci_dev *dma_pdev = pdev; - - /* Account for quirked devices */ - swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev)); - - /* - * If it's a multifunction device that does not support our - * required ACS flags, add to the same group as lowest numbered - * function that also does not suport the required ACS flags. - */ - if (dma_pdev->multifunction && - !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) { - u8 i, slot = PCI_SLOT(dma_pdev->devfn); - - for (i = 0; i < 8; i++) { - struct pci_dev *tmp; - - tmp = pci_get_slot(dma_pdev->bus, PCI_DEVFN(slot, i)); - if (!tmp) - continue; - - if (!pci_acs_enabled(tmp, REQ_ACS_FLAGS)) { - swap_pci_ref(&dma_pdev, tmp); - break; - } - pci_dev_put(tmp); - } - } - - /* - * Devices on the root bus go through the iommu. If that's not us, - * find the next upstream device and test ACS up to the root bus. - * Finding the next device may require skipping virtual buses. - */ - while (!pci_is_root_bus(dma_pdev->bus)) { - struct pci_bus *bus = find_hosted_bus(dma_pdev->bus); - if (IS_ERR(bus)) - break; - - if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS)) - break; - - swap_pci_ref(&dma_pdev, pci_dev_get(bus->self)); - } - - return dma_pdev; -} - -static int use_pdev_iommu_group(struct pci_dev *pdev, struct device *dev) -{ - struct iommu_group *group = iommu_group_get(&pdev->dev); - int ret; - - if (!group) { - group = iommu_group_alloc(); - if (IS_ERR(group)) - return PTR_ERR(group); - - WARN_ON(&pdev->dev != dev); - } - - ret = iommu_group_add_device(group, dev); - iommu_group_put(group); - return ret; -} - -static int use_dev_data_iommu_group(struct iommu_dev_data *dev_data, - struct device *dev) -{ - if (!dev_data->group) { - struct iommu_group *group = iommu_group_alloc(); - if (IS_ERR(group)) - return PTR_ERR(group); - - dev_data->group = group; - } - - return iommu_group_add_device(dev_data->group, dev); -} - static int init_iommu_group(struct device *dev) { - struct iommu_dev_data *dev_data; struct iommu_group *group; - struct pci_dev *dma_pdev; - int ret; - group = iommu_group_get(dev); - if (group) { - iommu_group_put(group); - return 0; - } + group = iommu_group_get_for_dev(dev); - dev_data = find_dev_data(get_device_id(dev)); - if (!dev_data) - return -ENOMEM; - - if (dev_data->alias_data) { - u16 alias; - struct pci_bus *bus; - - if (dev_data->alias_data->group) - goto use_group; + if (IS_ERR(group)) + return PTR_ERR(group); - /* - * If the alias device exists, it's effectively just a first - * level quirk for finding the DMA source. - */ - alias = amd_iommu_alias_table[dev_data->devid]; - dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff); - if (dma_pdev) { - dma_pdev = get_isolation_root(dma_pdev); - goto use_pdev; - } - - /* - * If the alias is virtual, try to find a parent device - * and test whether the IOMMU group is actualy rooted above - * the alias. Be careful to also test the parent device if - * we think the alias is the root of the group. - */ - bus = pci_find_bus(0, alias >> 8); - if (!bus) - goto use_group; - - bus = find_hosted_bus(bus); - if (IS_ERR(bus) || !bus->self) - goto use_group; - - dma_pdev = get_isolation_root(pci_dev_get(bus->self)); - if (dma_pdev != bus->self || (dma_pdev->multifunction && - !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS))) - goto use_pdev; - - pci_dev_put(dma_pdev); - goto use_group; - } - - dma_pdev = get_isolation_root(pci_dev_get(to_pci_dev(dev))); -use_pdev: - ret = use_pdev_iommu_group(dma_pdev, dev); - pci_dev_put(dma_pdev); - return ret; -use_group: - return use_dev_data_iommu_group(dev_data->alias_data, dev); + iommu_group_put(group); + return 0; } static int __last_alias(struct pci_dev *pdev, u16 alias, void *data) diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index f1a5abf..7277a20 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -432,7 +432,6 @@ struct iommu_dev_data { struct iommu_dev_data *alias_data;/* The alias dev_data */ struct protection_domain *domain; /* Domain the device is bound to */ atomic_t bind; /* Domain attach reference count */ - struct iommu_group *group; /* IOMMU group for virtual aliases */ u16 devid; /* PCI Device ID */ bool iommu_v2; /* Device can make use of IOMMUv2 */ bool passthrough; /* Default for device is pt_domain */