Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756150Ab1FJMJ4 (ORCPT ); Fri, 10 Jun 2011 08:09:56 -0400 Received: from ch1ehsobe003.messaging.microsoft.com ([216.32.181.183]:26239 "EHLO CH1EHSOBE016.bigfish.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756012Ab1FJMIb (ORCPT ); Fri, 10 Jun 2011 08:08:31 -0400 X-SpamScore: 1 X-BigFish: VPS1(zzzz1202hzz8275bhz32i668h839h61h) X-Spam-TCS-SCL: 0:0 X-Forefront-Antispam-Report: CIP:163.181.249.108;KIP:(null);UIP:(null);IPVD:NLI;H:ausb3twp01.amd.com;RD:none;EFVD:NLI X-WSS-ID: 0LMKPQ2-01-6LU-02 X-M-MSG: From: Joerg Roedel To: , CC: Joerg Roedel Subject: [PATCH 2/9] x86/amd-iommu: Introduce global dev_data_list Date: Fri, 10 Jun 2011 14:08:42 +0200 Message-ID: <1307707729-29767-3-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1307707729-29767-1-git-send-email-joerg.roedel@amd.com> References: <1307707729-29767-1-git-send-email-joerg.roedel@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: amd.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4268 Lines: 148 This list keeps all allocated iommu_dev_data structs in a list together. This is needed for instances that have no associated device. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/amd_iommu_types.h | 1 + arch/x86/kernel/amd_iommu.c | 56 ++++++++++++++++++++++++++----- 2 files changed, 48 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h index 4c99829..35520e3 100644 --- a/arch/x86/include/asm/amd_iommu_types.h +++ b/arch/x86/include/asm/amd_iommu_types.h @@ -310,6 +310,7 @@ struct protection_domain { */ struct iommu_dev_data { struct list_head list; /* For domain->dev_list */ + struct list_head dev_data_list; /* For global dev_data_list */ struct device *dev; /* Device this data belong to */ struct device *alias; /* The Alias Device */ struct protection_domain *domain; /* Domain the device is bound to */ diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index cc6f6da6..8b84890 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -45,6 +45,10 @@ static DEFINE_RWLOCK(amd_iommu_devtable_lock); static LIST_HEAD(iommu_pd_list); static DEFINE_SPINLOCK(iommu_pd_list_lock); +/* List of all available dev_data structures */ +static LIST_HEAD(dev_data_list); +static DEFINE_SPINLOCK(dev_data_list_lock); + /* * Domain for untranslated devices - only allocated * if iommu=pt passed on kernel cmd line. @@ -68,6 +72,35 @@ static void update_domain(struct protection_domain *domain); * ****************************************************************************/ +static struct iommu_dev_data *alloc_dev_data(void) +{ + struct iommu_dev_data *dev_data; + unsigned long flags; + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return NULL; + + atomic_set(&dev_data->bind, 0); + + spin_lock_irqsave(&dev_data_list_lock, flags); + list_add_tail(&dev_data->dev_data_list, &dev_data_list); + spin_unlock_irqrestore(&dev_data_list_lock, flags); + + return dev_data; +} + +static void free_dev_data(struct iommu_dev_data *dev_data) +{ + unsigned long flags; + + spin_lock_irqsave(&dev_data_list_lock, flags); + list_del(&dev_data->dev_data_list); + spin_unlock_irqrestore(&dev_data_list_lock, flags); + + kfree(dev_data); +} + static inline u16 get_device_id(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); @@ -139,32 +172,28 @@ static int iommu_init_device(struct device *dev) { struct iommu_dev_data *dev_data; struct pci_dev *pdev; - u16 devid, alias; + u16 alias; if (dev->archdata.iommu) return 0; - dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + dev_data = alloc_dev_data(); if (!dev_data) return -ENOMEM; dev_data->dev = dev; - devid = get_device_id(dev); - alias = amd_iommu_alias_table[devid]; + alias = amd_iommu_alias_table[get_device_id(dev)]; pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff); if (pdev) dev_data->alias = &pdev->dev; else { - kfree(dev_data); + free_dev_data(dev_data); return -ENOTSUPP; } - atomic_set(&dev_data->bind, 0); - dev->archdata.iommu = dev_data; - return 0; } @@ -184,11 +213,16 @@ static void iommu_ignore_device(struct device *dev) static void iommu_uninit_device(struct device *dev) { - kfree(dev->archdata.iommu); + /* + * Nothing to do here - we keep dev_data around for unplugged devices + * and reuse it when the device is re-plugged - not doing so would + * introduce a ton of races. + */ } void __init amd_iommu_uninit_devices(void) { + struct iommu_dev_data *dev_data, *n; struct pci_dev *pdev = NULL; for_each_pci_dev(pdev) { @@ -198,6 +232,10 @@ void __init amd_iommu_uninit_devices(void) iommu_uninit_device(&pdev->dev); } + + /* Free all of our dev_data structures */ + list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list) + free_dev_data(dev_data); } int __init amd_iommu_init_devices(void) -- 1.7.4.1 -- 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/