From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933440AbZIDJj1 (ORCPT ); Fri, 4 Sep 2009 05:39:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933306AbZIDJjO (ORCPT ); Fri, 4 Sep 2009 05:39:14 -0400 Received: from tx2ehsobe003.messaging.microsoft.com ([65.55.88.13]:38884 "EHLO TX2EHSOBE006.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933367AbZIDJi2 (ORCPT ); Fri, 4 Sep 2009 05:38:28 -0400 X-SpamScore: 5 X-BigFish: VPS5(zba6lzzz1202hzzz32i203h62h) X-Spam-TCS-SCL: 1:0 X-FB-SS: 5, X-WSS-ID: 0KPFXG0-01-4M5-02 X-M-MSG: From: Joerg Roedel To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org CC: Joerg Roedel Subject: [PATCH 3/8] x86/amd-iommu: Add passthrough mode initialization functions Date: Fri, 4 Sep 2009 11:36:29 +0200 Message-ID: <1252056994-31980-4-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.6.3.3 In-Reply-To: <1252056994-31980-1-git-send-email-joerg.roedel@amd.com> References: <1252056994-31980-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 04 Sep 2009 09:36:43.0513 (UTC) FILETIME=[3692CE90:01CA2D43] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When iommu=pt is passed on kernel command line the devices should run untranslated. This requires the allocation of a special domain for that purpose. This patch implements the allocation and initialization path for iommu=pt. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/amd_iommu.h | 1 + arch/x86/include/asm/amd_iommu_types.h | 4 ++ arch/x86/kernel/amd_iommu.c | 72 ++++++++++++++++++++++++++++---- 3 files changed, 69 insertions(+), 8 deletions(-) diff --git a/arch/x86/include/asm/amd_iommu.h b/arch/x86/include/asm/amd_iommu.h index bdf96f1..ac95995 100644 --- a/arch/x86/include/asm/amd_iommu.h +++ b/arch/x86/include/asm/amd_iommu.h @@ -25,6 +25,7 @@ #ifdef CONFIG_AMD_IOMMU extern int amd_iommu_init(void); extern int amd_iommu_init_dma_ops(void); +extern int amd_iommu_init_passthrough(void); extern void amd_iommu_detect(void); extern irqreturn_t amd_iommu_int_handler(int irq, void *data); extern void amd_iommu_flush_all_domains(void); diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h index 0c878ca..49f7453 100644 --- a/arch/x86/include/asm/amd_iommu_types.h +++ b/arch/x86/include/asm/amd_iommu_types.h @@ -143,6 +143,7 @@ #define EVT_BUFFER_SIZE 8192 /* 512 entries */ #define EVT_LEN_MASK (0x9ULL << 56) +#define PAGE_MODE_NONE 0x00 #define PAGE_MODE_1_LEVEL 0x01 #define PAGE_MODE_2_LEVEL 0x02 #define PAGE_MODE_3_LEVEL 0x03 @@ -194,6 +195,9 @@ #define PD_DMA_OPS_MASK (1UL << 0) /* domain used for dma_ops */ #define PD_DEFAULT_MASK (1UL << 1) /* domain is a default dma_ops domain for an IOMMU */ +#define PD_PASSTHROUGH_MASK (1UL << 2) /* domain has no page + translation */ + extern bool amd_iommu_dump; #define DUMP_printk(format, arg...) \ do { \ diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 0934348..7987f20 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -41,6 +41,12 @@ static DEFINE_RWLOCK(amd_iommu_devtable_lock); static LIST_HEAD(iommu_pd_list); static DEFINE_SPINLOCK(iommu_pd_list_lock); +/* + * Domain for untranslated devices - only allocated + * if iommu=pt passed on kernel cmd line. + */ +static struct protection_domain *pt_domain; + #ifdef CONFIG_IOMMU_API static struct iommu_ops amd_iommu_ops; #endif @@ -1067,9 +1073,9 @@ static struct protection_domain *domain_for_device(u16 devid) * If a device is not yet associated with a domain, this function does * assigns it visible for the hardware */ -static void attach_device(struct amd_iommu *iommu, - struct protection_domain *domain, - u16 devid) +static void __attach_device(struct amd_iommu *iommu, + struct protection_domain *domain, + u16 devid) { unsigned long flags; u64 pte_root = virt_to_phys(domain->pt_root); @@ -1087,12 +1093,19 @@ static void attach_device(struct amd_iommu *iommu, amd_iommu_pd_table[devid] = domain; write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); +} - /* - * We might boot into a crash-kernel here. The crashed kernel - * left the caches in the IOMMU dirty. So we have to flush - * here to evict all dirty stuff. - */ +static void attach_device(struct amd_iommu *iommu, + struct protection_domain *domain, + u16 devid) +{ + __attach_device(iommu, domain, devid); + + /* + * We might boot into a crash-kernel here. The crashed kernel + * left the caches in the IOMMU dirty. So we have to flush + * here to evict all dirty stuff. + */ iommu_queue_inv_dev_entry(iommu, devid); iommu_flush_tlb_pde(iommu, domain->id); } @@ -2219,3 +2232,46 @@ static struct iommu_ops amd_iommu_ops = { .domain_has_cap = amd_iommu_domain_has_cap, }; +/***************************************************************************** + * + * The next functions do a basic initialization of IOMMU for pass through + * mode + * + * In passthrough mode the IOMMU is initialized and enabled but not used for + * DMA-API translation. + * + *****************************************************************************/ + +int __init amd_iommu_init_passthrough(void) +{ + struct pci_dev *dev = NULL; + u16 devid, devid2; + + /* allocate passthroug domain */ + pt_domain = protection_domain_alloc(); + if (!pt_domain) + return -ENOMEM; + + pt_domain->mode |= PAGE_MODE_NONE; + + while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { + struct amd_iommu *iommu; + + devid = calc_devid(dev->bus->number, dev->devfn); + if (devid > amd_iommu_last_bdf) + continue; + + devid2 = amd_iommu_alias_table[devid]; + + iommu = amd_iommu_rlookup_table[devid2]; + if (!iommu) + continue; + + __attach_device(iommu, pt_domain, devid); + __attach_device(iommu, pt_domain, devid2); + } + + pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); + + return 0; +} -- 1.6.3.3