From nobody Fri Feb 13 15:41:09 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C2E8E6FE52 for ; Fri, 22 Sep 2023 15:19:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232832AbjIVPTp (ORCPT ); Fri, 22 Sep 2023 11:19:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232655AbjIVPTi (ORCPT ); Fri, 22 Sep 2023 11:19:38 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E63FC100 for ; Fri, 22 Sep 2023 08:19:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695395972; x=1726931972; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lpncFO9EBL1O72rF23q9xrrFLTa4Sw3ZpdC9K4pRN7g=; b=BfOOt7818pmRpZ+9PZfwavJ1pO3jz+yViwdl+DQYR2HEHRs+KU+i5gK2 sC/Avd7rIDDvtLFi6RDcRC73yJh7+xkbgl6IC2U+aOGBFbfenLSKLk91m kbwKRG5Q+OAs/8cFNlsXc7IpyU3LeQnxY5jJXnVgZWUsxP7TC4qbABLF0 gMBXGZNY1HTCa9PRNb4wdB8xgUOm81V9zsBTsMTdKCS/WY/W4dV4P1+aw 2wFp8aFPNprk6NxPswbiAhi4o+T/1/auId1JIc345VPC6OWgwZ7h8ynCg q+tsjPyD2HJtAyzozBg7ZoH7FNvzFb2YE89R5MFGRkyRBJT4sgw94lFF4 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="360235278" X-IronPort-AV: E=Sophos;i="6.03,167,1694761200"; d="scan'208";a="360235278" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2023 08:19:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="741133159" X-IronPort-AV: E=Sophos;i="6.03,167,1694761200"; d="scan'208";a="741133159" Received: from cascade.sh.intel.com ([10.239.48.35]) by orsmga007.jf.intel.com with ESMTP; 22 Sep 2023 08:19:30 -0700 From: Jingqi Liu To: iommu@lists.linux.dev, Lu Baolu , Tian Kevin , Joerg Roedel , Will Deacon , Robin Murphy Cc: linux-kernel@vger.kernel.org, Jingqi Liu Subject: [PATCH v2 1/3] iommu/vt-d: debugfs: Dump entry pointing to huge page Date: Fri, 22 Sep 2023 23:16:34 +0800 Message-Id: <20230922151636.77139-2-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230922151636.77139-1-Jingqi.liu@intel.com> References: <20230922151636.77139-1-Jingqi.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" For the page table entry pointing to a huge page, the data below the level of the huge page is meaningless and does not need to be dumped. Signed-off-by: Jingqi Liu --- drivers/iommu/intel/debugfs.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 0255c4a23269..e2a3c37943a0 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -311,9 +311,14 @@ static inline unsigned long level_to_directory_size(in= t level) static inline void dump_page_info(struct seq_file *m, unsigned long iova, u64 *path) { - seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\t0x= %016llx\n", - iova >> VTD_PAGE_SHIFT, path[5], path[4], - path[3], path[2], path[1]); + seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx", + iova >> VTD_PAGE_SHIFT, path[5], path[4], path[3]); + if (path[2]) { + seq_printf(m, "\t0x%016llx", path[2]); + if (path[1]) + seq_printf(m, "\t0x%016llx", path[1]); + } + seq_putc(m, '\n'); } =20 static void pgtable_walk_level(struct seq_file *m, struct dma_pte *pde, --=20 2.21.3 From nobody Fri Feb 13 15:41:09 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF3D1E6FE54 for ; Fri, 22 Sep 2023 15:19:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232924AbjIVPTr (ORCPT ); Fri, 22 Sep 2023 11:19:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232775AbjIVPTl (ORCPT ); Fri, 22 Sep 2023 11:19:41 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08828100 for ; Fri, 22 Sep 2023 08:19:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695395974; x=1726931974; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IXYskJaCLZ+4OaCPYK8RdzCAFgSujuD6QEnWhzftS5U=; b=eMGg+KKdc9qGfN0G1QXJFHu6S1FMiWbDrZFu5W4eE/uE2bkpG7tLL9hQ k2gFtoYSTms6ijf6F4R0aSL/q4v4+1GTtmEiuJJm+g+zoqhYrUf5bzEEn YU34DOTD0JYaCZAXIUCyQrGTbIf6w7HkZw6GVSaJ81UAqWRzOrLKXk5qf YY4PCb/bllfvenYQda43rgoiRHkbU6ROt6qigvvlSc/Tqgxv1Rqqd5o5g 7cD4FEQ3i+ob3EgLcrTyWYYAEzNNaw/MIOx8vp0jRGBM3SAma+sNri6JD ONNT4AqmeMkbkWSJ3fnKzBOm26Mp9Whb2h8VazdoQ7RL0E+YT+o4zeKkB g==; X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="360235284" X-IronPort-AV: E=Sophos;i="6.03,167,1694761200"; d="scan'208";a="360235284" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2023 08:19:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="741133186" X-IronPort-AV: E=Sophos;i="6.03,167,1694761200"; d="scan'208";a="741133186" Received: from cascade.sh.intel.com ([10.239.48.35]) by orsmga007.jf.intel.com with ESMTP; 22 Sep 2023 08:19:32 -0700 From: Jingqi Liu To: iommu@lists.linux.dev, Lu Baolu , Tian Kevin , Joerg Roedel , Will Deacon , Robin Murphy Cc: linux-kernel@vger.kernel.org, Jingqi Liu Subject: [PATCH v2 2/3] iommu/vt-d: debugfs: Create/remove debugfs file per {device, pasid} Date: Fri, 22 Sep 2023 23:16:35 +0800 Message-Id: <20230922151636.77139-3-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230922151636.77139-1-Jingqi.liu@intel.com> References: <20230922151636.77139-1-Jingqi.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add a debugfs directory per pair of {device, pasid} if the mappings of its page table are created and destroyed by the iommu_map/unmap() interfaces. i.e. /sys/kernel/debug/iommu/intel//. Create a debugfs file in the directory for users to dump the page table corresponding to {device, pasid}. e.g. /sys/kernel/debug/iommu/intel/0000:00:02.0/0/domain_translation_struct. When attaching device without pasid, create a debugfs file with PASID#0, i.e. RID_PASID. When attaching a domain to a pasid of device, create a debugfs file with the specified pasid. When detaching without pasid, remove the directory and file for PASID#0. When detaching with pasid, remove the debugfs directory and file of the specified pasid. Remove the entire debugfs directory of the specified device for releasing device. e.g. /sys/kernel/debug/iommu/intel/0000:00:01.0 Signed-off-by: Jingqi Liu --- drivers/iommu/intel/debugfs.c | 117 ++++++++++++++++++++++++++++++++-- drivers/iommu/intel/iommu.c | 16 +++++ drivers/iommu/intel/iommu.h | 4 ++ 3 files changed, 132 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index e2a3c37943a0..9128febba3c6 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -32,6 +32,11 @@ struct iommu_regset { const char *regs; }; =20 +struct show_domain_info { + struct device *dev; + ioasid_t pasid; +}; + #define DEBUG_BUFFER_SIZE 1024 static char debug_buf[DEBUG_BUFFER_SIZE]; =20 @@ -111,6 +116,8 @@ static const struct iommu_regset iommu_regs_64[] =3D { IOMMU_REGSET_ENTRY(VCRSP), }; =20 +static struct dentry *intel_iommu_debug; + static int iommu_regset_show(struct seq_file *m, void *unused) { struct dmar_drhd_unit *drhd; @@ -673,16 +680,12 @@ static const struct file_operations dmar_perf_latency= _fops =3D { =20 void __init intel_iommu_debugfs_init(void) { - struct dentry *intel_iommu_debug =3D debugfs_create_dir("intel", - iommu_debugfs_dir); + intel_iommu_debug =3D debugfs_create_dir("intel", iommu_debugfs_dir); =20 debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL, &iommu_regset_fops); debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug, NULL, &dmar_translation_struct_fops); - debugfs_create_file("domain_translation_struct", 0444, - intel_iommu_debug, NULL, - &domain_translation_struct_fops); debugfs_create_file("invalidation_queue", 0444, intel_iommu_debug, NULL, &invalidation_queue_fops); #ifdef CONFIG_IRQ_REMAP @@ -692,3 +695,107 @@ void __init intel_iommu_debugfs_init(void) debugfs_create_file("dmar_perf_latency", 0644, intel_iommu_debug, NULL, &dmar_perf_latency_fops); } + +/* + * Create a debugfs directory per pair of {device, pasid}, + * then create the corresponding debugfs file in this directory + * for user to dump its page table. e.g. + * /sys/kernel/debug/iommu/intel/0000:00:01.0/0/domain_translation_struct + */ +void intel_iommu_debugfs_create_dev_pasid(struct device *dev, u32 pasid) +{ + struct dentry *pasid_dir =3D NULL, *dev_dir =3D NULL; + struct iommu_domain *domain =3D NULL; + struct show_domain_info *sinfo; + char pname[10]; + + if (pasid =3D=3D IOMMU_NO_PASID) { + struct device_domain_info *info =3D dev_iommu_priv_get(dev); + if (!info) + return; + domain =3D &info->domain->domain; + } else + domain =3D iommu_get_domain_for_dev_pasid(dev, pasid, 0); + + /* + * The debugfs only dumps the page tables whose mappings are created + * and destroyed by the iommu_map/unmap() interfaces. Check the + * mapping type of the domain before creating debugfs directory. + */ + if (!domain || !(domain->type & __IOMMU_DOMAIN_PAGING)) + return; + + dev_dir =3D debugfs_lookup(dev_name(dev), intel_iommu_debug); + if (!dev_dir) { + dev_dir =3D debugfs_create_dir(dev_name(dev), intel_iommu_debug); + if (IS_ERR(dev_dir)) + return; + } + + sprintf(pname, "%x", pasid); + pasid_dir =3D debugfs_create_dir(pname, dev_dir); + if (IS_ERR(pasid_dir)) + return; + + sinfo =3D kzalloc(sizeof(*sinfo), GFP_KERNEL); + if (!sinfo) + return; + + sinfo->dev =3D dev; + sinfo->pasid =3D pasid; + + debugfs_create_file("domain_translation_struct", 0444, + pasid_dir, sinfo, + &domain_translation_struct_fops); +} + +/* + * Remove the debugfs directory and file corresponding to each pair of + * {device, pasid}. There're two scenarios that will call this helper: + * 1) Detach the specified device with pasid. + * 2) IOMMU release a device. + */ +void intel_iommu_debugfs_remove_dev_pasid(struct device *dev, u32 pasid) +{ + struct dentry *pasid_dir =3D NULL, *dev_dir =3D NULL; + struct dentry *dentry =3D NULL; + char pname[10]; + + dev_dir =3D debugfs_lookup(dev_name(dev), intel_iommu_debug); + if (!dev_dir) + return; + + /* Check if the entire debugfs directory needs to be removed. */ + if (pasid =3D=3D IOMMU_PASID_INVALID) { + struct list_head *plist; + struct dentry *sub_dentry; + + list_for_each(plist, &(dev_dir->d_subdirs)) { + sub_dentry =3D list_entry(plist, struct dentry, d_child); + if(sub_dentry) { + dentry =3D debugfs_lookup("domain_translation_struct", sub_dentry); + if (!dentry) + continue; + + if (dentry->d_inode->i_private) + kfree(dentry->d_inode->i_private); + } + } + + debugfs_remove_recursive(dev_dir); + } else { /* Remove the directory with specified pasid. */ + sprintf(pname, "%x", pasid); + pasid_dir =3D debugfs_lookup(pname, dev_dir); + if (!pasid_dir) + return; + + dentry =3D debugfs_lookup("domain_translation_struct", pasid_dir); + if (!dentry) + return; + + if (dentry->d_inode->i_private) + kfree(dentry->d_inode->i_private); + + debugfs_remove_recursive(pasid_dir); + } +} diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index dd8ff358867d..8d3c3ef1d0e2 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2488,6 +2488,8 @@ static int dmar_domain_attach_device(struct dmar_doma= in *domain, =20 iommu_enable_pci_caps(info); =20 + intel_iommu_debugfs_create_dev_pasid(dev, IOMMU_NO_PASID); + return 0; } =20 @@ -3966,6 +3968,9 @@ static void dmar_remove_one_dev_info(struct device *d= ev) =20 domain_detach_iommu(domain, iommu); info->domain =3D NULL; + + /* Remove the entire debugfs directory specified by device. */ + intel_iommu_debugfs_remove_dev_pasid(dev, IOMMU_PASID_INVALID); } =20 /* @@ -3997,6 +4002,12 @@ static void device_block_translation(struct device *= dev) =20 domain_detach_iommu(info->domain, iommu); info->domain =3D NULL; + + /* + * Remove the debugfs directory specified by device and + * RID_PASID pasid. + */ + intel_iommu_debugfs_remove_dev_pasid(dev, IOMMU_NO_PASID); } =20 static int md_domain_init(struct dmar_domain *domain, int guest_width) @@ -4729,6 +4740,9 @@ static void intel_iommu_remove_dev_pasid(struct devic= e *dev, ioasid_t pasid) out_tear_down: intel_pasid_tear_down_entry(iommu, dev, pasid, false); intel_drain_pasid_prq(dev, pasid); + + /* Remove the debugfs directory specified by device and pasid. */ + intel_iommu_debugfs_remove_dev_pasid(dev, pasid); } =20 static int intel_iommu_set_dev_pasid(struct iommu_domain *domain, @@ -4777,6 +4791,8 @@ static int intel_iommu_set_dev_pasid(struct iommu_dom= ain *domain, list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids); spin_unlock_irqrestore(&dmar_domain->lock, flags); =20 + intel_iommu_debugfs_create_dev_pasid(dev, pasid); + return 0; out_detach_iommu: domain_detach_iommu(dmar_domain, iommu); diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h index c18fb699c87a..250178d8014b 100644 --- a/drivers/iommu/intel/iommu.h +++ b/drivers/iommu/intel/iommu.h @@ -883,8 +883,12 @@ static inline void intel_svm_remove_dev_pasid(struct d= evice *dev, ioasid_t pasid =20 #ifdef CONFIG_INTEL_IOMMU_DEBUGFS void intel_iommu_debugfs_init(void); +void intel_iommu_debugfs_create_dev_pasid(struct device *dev, u32 pasid); +void intel_iommu_debugfs_remove_dev_pasid(struct device *dev, u32 pasid); #else static inline void intel_iommu_debugfs_init(void) {} +void intel_iommu_debugfs_create_dev_pasid(struct device *dev, u32 pasid) {} +void intel_iommu_debugfs_remove_dev_pasid(struct device *dev, u32 pasid) {} #endif /* CONFIG_INTEL_IOMMU_DEBUGFS */ =20 extern const struct attribute_group *intel_iommu_groups[]; --=20 2.21.3 From nobody Fri Feb 13 15:41:09 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DFB7E6FE52 for ; Fri, 22 Sep 2023 15:19:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232941AbjIVPTu (ORCPT ); Fri, 22 Sep 2023 11:19:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232849AbjIVPTo (ORCPT ); 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22 Sep 2023 08:19:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="741133231" X-IronPort-AV: E=Sophos;i="6.03,167,1694761200"; d="scan'208";a="741133231" Received: from cascade.sh.intel.com ([10.239.48.35]) by orsmga007.jf.intel.com with ESMTP; 22 Sep 2023 08:19:34 -0700 From: Jingqi Liu To: iommu@lists.linux.dev, Lu Baolu , Tian Kevin , Joerg Roedel , Will Deacon , Robin Murphy Cc: linux-kernel@vger.kernel.org, Jingqi Liu Subject: [PATCH v2 3/3] iommu/vt-d: debugfs: Support dumping a specified page table Date: Fri, 22 Sep 2023 23:16:36 +0800 Message-Id: <20230922151636.77139-4-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230922151636.77139-1-Jingqi.liu@intel.com> References: <20230922151636.77139-1-Jingqi.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The original debugfs only dumps all page tables without pasid. With pasid supported, the page table with pasid also needs to be dumped. This patch supports dumping a specified page table in legacy mode or scalable mode with or without a specified pasid. For legacy mode, according to bus number and DEVFN, traverse the root table and context table to get the pointer of page table in the context table entry, then dump the specified page table. For scalable mode, according to bus number, DEVFN and pasid, traverse the root table, context table, pasid directory and pasid table to get the pointer of page table in the pasid table entry, then dump the specified page table.. Examples are as follows: 1) Dump the page table of device "0000:00:1f.0" that only supports legacy mode. $ sudo cat /sys/kernel/debug/iommu/intel/0000:00:1f.0/0/domain_translation_struct 2) Dump the page table of device "0000:00:0a.0" with PASID "1" that supports scalable mode. $ sudo cat /sys/kernel/debug/iommu/intel/0000:00:0a.0/1/domain_translation_struct Suggested-by: Kevin Tian Signed-off-by: Jingqi Liu --- drivers/iommu/intel/debugfs.c | 163 +++++++++++++++++++++++++--------- 1 file changed, 121 insertions(+), 42 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 9128febba3c6..51f0e022c06e 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -352,58 +352,137 @@ static void pgtable_walk_level(struct seq_file *m, s= truct dma_pte *pde, } } =20 -static int __show_device_domain_translation(struct device *dev, void *data) +static int domain_translation_struct_show(struct seq_file *m, void *unused) { - struct dmar_domain *domain; - struct seq_file *m =3D data; - u64 path[6] =3D { 0 }; + struct device_domain_info *info; + struct show_domain_info *sinfo; + bool scalable, found =3D false; + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + u16 devfn, bus, seg; =20 - domain =3D to_dmar_domain(iommu_get_domain_for_dev(dev)); - if (!domain) - return 0; + if (!m || !m->private) { + seq_puts(m, "Invalid device or pasid!\n"); + return -EINVAL; + } =20 - seq_printf(m, "Device %s @0x%llx\n", dev_name(dev), - (u64)virt_to_phys(domain->pgd)); - seq_puts(m, "IOVA_PFN\t\tPML5E\t\t\tPML4E\t\t\tPDPE\t\t\tPDE\t\t\tPTE\n"); + sinfo =3D (struct show_domain_info*)m->private; + if (!sinfo->dev || + !dev_iommu_priv_get(sinfo->dev) || + (sinfo->pasid =3D=3D IOMMU_PASID_INVALID)) { + seq_puts(m, "Please specify device or pasid!\n"); + return -ENODEV; + } =20 - pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path); - seq_putc(m, '\n'); + info =3D dev_iommu_priv_get(sinfo->dev); + bus =3D info->bus; + devfn =3D info->devfn; + seg =3D info->segment; =20 - /* Don't iterate */ - return 1; -} + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + struct context_entry *context; + u64 pgd, path[6] =3D { 0 }; + u32 sts, agaw; =20 -static int show_device_domain_translation(struct device *dev, void *data) -{ - struct iommu_group *group; + if (seg !=3D iommu->segment) + continue; =20 - device_lock(dev); - group =3D iommu_group_get(dev); - device_unlock(dev); - if (!group) - return 0; + sts =3D dmar_readl(iommu->reg + DMAR_GSTS_REG); + if (!(sts & DMA_GSTS_TES)) { + seq_printf(m, "DMA Remapping is not enabled on %s\n", + iommu->name); + continue; + } + if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) + scalable =3D true; + else + scalable =3D false; =20 - /* - * The group->mutex is held across the callback, which will - * block calls to iommu_attach/detach_group/device. Hence, - * the domain of the device will not change during traversal. - * - * All devices in an iommu group share a single domain, hence - * we only dump the domain of the first device. Even though, - * this code still possibly races with the iommu_unmap() - * interface. This could be solved by RCU-freeing the page - * table pages in the iommu_unmap() path. - */ - iommu_group_for_each_dev(group, data, __show_device_domain_translation); - iommu_group_put(group); + /* + * The iommu->lock is held across the callback, which will + * block calls to domain_attach/domain_detach. Hence, + * the domain of the device will not change during traversal. + * + * Traversing page table possibly races with the iommu_unmap() + * interface. This could be solved by RCU-freeing the page + * table pages in the iommu_unmap() path. + */ + spin_lock(&iommu->lock); =20 - return 0; -} + context =3D iommu_context_addr(iommu, bus, devfn, 0); + if (!context || !context_present(context)) + goto iommu_unlock; =20 -static int domain_translation_struct_show(struct seq_file *m, void *unused) -{ - return bus_for_each_dev(&pci_bus_type, NULL, m, - show_device_domain_translation); + if (scalable) { /* scalable mode */ + struct pasid_dir_entry *dir_tbl, *dir_entry; + struct pasid_entry *pasid_tbl, *pasid_tbl_entry; + u16 pasid_dir_size, dir_idx, tbl_idx, pgtt; + u64 pasid_dir_ptr; + + pasid_dir_ptr =3D context->lo & VTD_PAGE_MASK; + pasid_dir_size =3D get_pasid_dir_size(context); + + /* Dump specified device domain mappings with PASID. */ + dir_idx =3D sinfo->pasid >> PASID_PDE_SHIFT; + tbl_idx =3D sinfo->pasid & PASID_PTE_MASK; + + dir_tbl =3D phys_to_virt(pasid_dir_ptr); + dir_entry =3D &dir_tbl[dir_idx]; + + pasid_tbl =3D get_pasid_table_from_pde(dir_entry); + if (!pasid_tbl) + goto iommu_unlock; + + pasid_tbl_entry =3D &pasid_tbl[tbl_idx]; + if (!pasid_pte_is_present(pasid_tbl_entry)) + goto iommu_unlock; + + /* + * According to PASID Granular Translation Type(PGTT), + * get the page table pointer. + */ + pgtt =3D (u16)(pasid_tbl_entry->val[0] & GENMASK_ULL(8, 6)) >> 6; + agaw =3D (u8)(pasid_tbl_entry->val[0] & GENMASK_ULL(4, 2)) >> 2; + + switch (pgtt) { + case PASID_ENTRY_PGTT_FL_ONLY: + pgd =3D pasid_tbl_entry->val[2]; + break; + case PASID_ENTRY_PGTT_SL_ONLY: + case PASID_ENTRY_PGTT_NESTED: + pgd =3D pasid_tbl_entry->val[0]; + break; + default: + goto iommu_unlock; + } + pgd &=3D VTD_PAGE_MASK; + } else { /* legacy mode */ + pgd =3D context->lo & VTD_PAGE_MASK; + agaw =3D context->hi & 7; + } + + seq_printf(m, "Device %04x:%02x:%02x.%x ", + iommu->segment, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); + + if (scalable) + seq_printf(m, "with pasid %x @0x%llx\n", sinfo->pasid, pgd); + else + seq_printf(m, "@0x%llx\n", pgd); + + seq_printf(m, "%-17s\t%-18s\t%-18s\t%-18s\t%-18s\t%-s\n", + "IOVA_PFN", "PML5E", "PML4E", "PDPE", "PDE", "PTE"); + pgtable_walk_level(m, phys_to_virt(pgd), agaw + 2, 0, path); + + found =3D true; +iommu_unlock: + spin_unlock(&iommu->lock); + if (found) + break; + } + rcu_read_unlock(); + + return 0; } DEFINE_SHOW_ATTRIBUTE(domain_translation_struct); =20 --=20 2.21.3