From nobody Sun Dec 14 02:06:04 2025 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 40F6FCDB47E for ; Fri, 13 Oct 2023 14:04:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232052AbjJMOEM (ORCPT ); Fri, 13 Oct 2023 10:04:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232029AbjJMOEF (ORCPT ); Fri, 13 Oct 2023 10:04:05 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42B83BF for ; Fri, 13 Oct 2023 07:04:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697205843; x=1728741843; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1MbYs6JgegSN2mIA//yZ0XYbUKs0DkULemhAxSRyXp4=; b=PGZG0xFPHZNm7YQsSKfFdHgvgwOWEEerZTRO/aN6rS/wZICsbolq4Tz5 Y5I4d21lM4A450zkvQ8T3Zgk5BeZ8Bf16GroWTMJM6nJuauHhC3PgfJYN Qbb0T4Po87n8RNrOiTlE3L1JdWKCcrSIc60doWSeDY71GI7K2JKVbZGjB TNfeJ+dfV4UWiSu7rVWDkrC1532ttntxiiS6huaYQgG8R3w+h/U408sP3 cDfPS50F2beHAB4q0Zr1pnDp4zfRyEFEFaXmXq0jus93jjCwjnHk7Ag39 5quZbJzX2CR+PalWGT68wB2foTCPbAcjcUUidor1HfQaILKBqm5y7Tx2t g==; X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="384049322" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="384049322" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2023 07:04:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="1086156354" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="1086156354" Received: from cascade.sh.intel.com ([10.239.48.35]) by fmsmga005.fm.intel.com with ESMTP; 13 Oct 2023 07:03:59 -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: [PATH v5 1/3] iommu/vt-d: debugfs: Dump entry pointing to huge page Date: Fri, 13 Oct 2023 21:58:09 +0800 Message-Id: <20231013135811.73953-2-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20231013135811.73953-1-Jingqi.liu@intel.com> References: <20231013135811.73953-1-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 1f925285104e..497c1561d3d2 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 Sun Dec 14 02:06:04 2025 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 E0825CDB483 for ; Fri, 13 Oct 2023 14:04:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232067AbjJMOEO (ORCPT ); Fri, 13 Oct 2023 10:04:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232022AbjJMOEH (ORCPT ); Fri, 13 Oct 2023 10:04:07 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B348595 for ; Fri, 13 Oct 2023 07:04:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697205845; x=1728741845; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=woZcGizHqGMuxdsTWPfygMZnJcyw/9NNvZJu26WAGmo=; b=Ge0bXdyo4wjc0gCIGcXbZcDn0XDFMx7uKI8P2P8hKkHNltXJEIAiEerA BU/eOB2Y+GkOw5ASglM30SY7iJA9gxGD19/UAd/V5drZYAgr8Y3Udt8Vm e63fbTo8zfqVtxYpvYtGrzUqZDzA6ZCmpcDm4rt7ibv2NiKfe2JmPGMpe Al6b8IYxGet8uxwCmuq0seue44n36bZXDo8a26dZbn/DUht10222fqb95 X8FnM2IVuoyewqrNSL1HaeOHzR7pa/9xitibpzoRyvdgWmraWGrabKZo6 ikqwFzQB9TQ8C2fCGbGccXIIV/iqwo0bgZn2sl44FuhRzzbjr1b1nK++I A==; X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="384049360" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="384049360" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2023 07:04:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="1086156406" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="1086156406" Received: from cascade.sh.intel.com ([10.239.48.35]) by fmsmga005.fm.intel.com with ESMTP; 13 Oct 2023 07:04:01 -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: [PATH v5 2/3] iommu/vt-d: debugfs: Create/remove debugfs file per {device, pasid} Date: Fri, 13 Oct 2023 21:58:10 +0800 Message-Id: <20231013135811.73953-3-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20231013135811.73953-1-Jingqi.liu@intel.com> References: <20231013135811.73953-1-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/0000:00:02.0/1/domain_translation_struct. For the default domain without pasid, it creates a debugfs file in the debugfs device directory for users to dump its page table. e.g. /sys/kernel/debug/iommu/intel/0000:00:02.0/domain_translation_struct. When setting a domain to a PASID of device, create a debugfs file in the pasid debugfs directory for users to dump the page table of the specified pasid. Remove the debugfs device directory of the device when releasing a device. e.g. /sys/kernel/debug/iommu/intel/0000:00:01.0 Signed-off-by: Jingqi Liu --- drivers/iommu/intel/debugfs.c | 53 +++++++++++++++++++++++++++++++---- drivers/iommu/intel/iommu.c | 7 +++++ drivers/iommu/intel/iommu.h | 14 +++++++++ 3 files changed, 69 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 497c1561d3d2..8a18a7be5215 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -111,6 +111,8 @@ 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; @@ -671,16 +673,12 @@ 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 @@ -690,3 +688,48 @@ 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 for each device, and then create a + * debugfs file in this directory for users to dump the page table + * of the default domain. e.g. + * /sys/kernel/debug/iommu/intel/0000:00:01.0/domain_translation_struct + */ +void intel_iommu_debugfs_create_dev(struct device_domain_info *info) +{ + info->debugfs_dentry =3D debugfs_create_dir(dev_name(info->dev), intel_io= mmu_debug); + + debugfs_create_file("domain_translation_struct", 0444, info->debugfs_dent= ry, + NULL, &domain_translation_struct_fops); +} + +/* Remove the device debugfs directory. */ +void intel_iommu_debugfs_remove_dev(struct device_domain_info *info) +{ + debugfs_remove_recursive(info->debugfs_dentry); +} + +/* + * Create a debugfs directory per pair of {device, pasid}, then create the + * corresponding debugfs file in this directory for users to dump its page + * table. e.g. + * /sys/kernel/debug/iommu/intel/0000:00:01.0/1/domain_translation_struct + * + * 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. + */ +void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_info *dev_pasid) +{ + struct device_domain_info *info =3D dev_iommu_priv_get(dev_pasid->dev); + char dir_name[10]; + + sprintf(dir_name, "%x", dev_pasid->pasid); + dev_pasid->debugfs_dentry =3D debugfs_create_dir(dir_name, info->debugfs_= dentry); +} + +/* Remove the device pasid debugfs directory. */ +void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_info *dev_pasid) +{ + debugfs_remove_recursive(dev_pasid->debugfs_dentry); +} diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 3685ba90ec88..d77d60bc418f 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4409,6 +4409,8 @@ static struct iommu_device *intel_iommu_probe_device(= struct device *dev) } } =20 + intel_iommu_debugfs_create_dev(info); + return &iommu->iommu; } =20 @@ -4418,6 +4420,7 @@ static void intel_iommu_release_device(struct device = *dev) =20 dmar_remove_one_dev_info(dev); intel_pasid_free_table(dev); + intel_iommu_debugfs_remove_dev(info); dev_iommu_priv_set(dev, NULL); kfree(info); set_dma_ops(dev, NULL); @@ -4710,6 +4713,7 @@ static void intel_iommu_remove_dev_pasid(struct devic= e *dev, ioasid_t pasid) spin_unlock_irqrestore(&dmar_domain->lock, flags); =20 domain_detach_iommu(dmar_domain, iommu); + intel_iommu_debugfs_remove_dev_pasid(dev_pasid); kfree(dev_pasid); out_tear_down: intel_pasid_tear_down_entry(iommu, dev, pasid, false); @@ -4762,6 +4766,9 @@ 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 + if (domain->type & __IOMMU_DOMAIN_PAGING) + 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 7dac94f62b4e..f9c1dd1ccff8 100644 --- a/drivers/iommu/intel/iommu.h +++ b/drivers/iommu/intel/iommu.h @@ -716,12 +716,18 @@ struct device_domain_info { struct intel_iommu *iommu; /* IOMMU used by this device */ struct dmar_domain *domain; /* pointer to domain */ struct pasid_table *pasid_table; /* pasid table */ +#ifdef CONFIG_INTEL_IOMMU_DEBUGFS + struct dentry *debugfs_dentry; /* pointer to device directory dentry */ +#endif }; =20 struct dev_pasid_info { struct list_head link_domain; /* link to domain siblings */ struct device *dev; ioasid_t pasid; +#ifdef CONFIG_INTEL_IOMMU_DEBUGFS + struct dentry *debugfs_dentry; /* pointer to pasid directory dentry */ +#endif }; =20 static inline void __iommu_flush_cache( @@ -883,8 +889,16 @@ 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(struct device_domain_info *info); +void intel_iommu_debugfs_remove_dev(struct device_domain_info *info); +void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_info *dev_pasid= ); +void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_info *dev_pasid= ); #else static inline void intel_iommu_debugfs_init(void) {} +static inline void intel_iommu_debugfs_create_dev(struct device_domain_inf= o *info) {} +static inline void intel_iommu_debugfs_remove_dev(struct device_domain_inf= o *info) {} +static inline void intel_iommu_debugfs_create_dev_pasid(struct dev_pasid_i= nfo *dev_pasid) {} +static inline void intel_iommu_debugfs_remove_dev_pasid(struct dev_pasid_i= nfo *dev_pasid) {} #endif /* CONFIG_INTEL_IOMMU_DEBUGFS */ =20 extern const struct attribute_group *intel_iommu_groups[]; --=20 2.21.3 From nobody Sun Dec 14 02:06:04 2025 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 B66DECDB486 for ; Fri, 13 Oct 2023 14:04:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232081AbjJMOEQ (ORCPT ); Fri, 13 Oct 2023 10:04:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232040AbjJMOEJ (ORCPT ); Fri, 13 Oct 2023 10:04:09 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C9F295 for ; Fri, 13 Oct 2023 07:04:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697205847; x=1728741847; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GdoVLgn6xyujFvF9/jEaVemFQ4kZTnFMaRtkIlR8N7U=; b=YqzzF/oH2m3N/wyeWAX1lfoi34CVN/LnPukMSZpOYggZqY9aB/vli8G6 gZHUsej0WX5y9XOU/Km4qMUcujHPPrGhZVdOOMgFgIvs96FjJYjLVxENu sO96Lj/FteCD94N3jppBRvNJPbQgl0phAUmSRfUnLtiVeUtVZzJTUCYJ1 exKOmH4o1Yj4xdWzY8aCRjBk+hZVqs01+t0my/l6vJOXKAhnOwtYAyWTt SuWdCUG71uhMnIhYEaHIy98WWWOLUTSAW1xpSAhKrp841tuFweeCezCCr IWD85q2EgmnBNswSqQWAcC18hBwZk+mCQQ5TOASW/DwOIYTOTbmSAD1jl w==; X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="384049380" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="384049380" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2023 07:04:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10862"; a="1086156479" X-IronPort-AV: E=Sophos;i="6.03,222,1694761200"; d="scan'208";a="1086156479" Received: from cascade.sh.intel.com ([10.239.48.35]) by fmsmga005.fm.intel.com with ESMTP; 13 Oct 2023 07:04:04 -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: [PATH v5 3/3] iommu/vt-d: debugfs: Support dumping a specified page table Date: Fri, 13 Oct 2023 21:58:11 +0800 Message-Id: <20231013135811.73953-4-Jingqi.liu@intel.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20231013135811.73953-1-Jingqi.liu@intel.com> References: <20231013135811.73953-1-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/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 | 154 ++++++++++++++++++++++++++-------- 1 file changed, 120 insertions(+), 34 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 8a18a7be5215..239136727ac4 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -347,58 +347,141 @@ 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, + struct device_domain_info *info, + ioasid_t pasid) { - struct dmar_domain *domain; - struct seq_file *m =3D data; - u64 path[6] =3D { 0 }; - - domain =3D to_dmar_domain(iommu_get_domain_for_dev(dev)); - if (!domain) - return 0; + bool scalable, found =3D false; + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + u16 devfn, bus, seg; =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"); + bus =3D info->bus; + devfn =3D info->devfn; + seg =3D info->segment; =20 - pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path); - seq_putc(m, '\n'); + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + struct context_entry *context; + u64 pgd, path[6] =3D { 0 }; + u32 sts, agaw; =20 - /* Don't iterate */ - return 1; -} + if (seg !=3D iommu->segment) + continue; =20 -static int show_device_domain_translation(struct device *dev, void *data) -{ - struct iommu_group *group; + 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 - group =3D iommu_group_get(dev); - if (group) { /* - * The group->mutex is held across the callback, which will - * block calls to iommu_attach/detach_group/device. Hence, + * 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. * - * 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() + * 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. */ - iommu_group_for_each_dev(group, data, - __show_device_domain_translation); - iommu_group_put(group); + spin_lock(&iommu->lock); + + context =3D iommu_context_addr(iommu, bus, devfn, 0); + if (!context || !context_present(context)) + goto iommu_unlock; + + 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 pasid >> PASID_PDE_SHIFT; + tbl_idx =3D 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", 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(); =20 return 0; } =20 -static int domain_translation_struct_show(struct seq_file *m, void *unused) +static int dev_domain_translation_struct_show(struct seq_file *m, void *un= used) { - return bus_for_each_dev(&pci_bus_type, NULL, m, - show_device_domain_translation); + struct device_domain_info *info =3D (struct device_domain_info *)m->priva= te; + + return domain_translation_struct_show(m, info, IOMMU_NO_PASID); } -DEFINE_SHOW_ATTRIBUTE(domain_translation_struct); +DEFINE_SHOW_ATTRIBUTE(dev_domain_translation_struct); + +static int pasid_domain_translation_struct_show(struct seq_file *m, void *= unused) +{ + struct dev_pasid_info *dev_pasid =3D (struct dev_pasid_info *)m->private; + struct device_domain_info *info =3D dev_iommu_priv_get(dev_pasid->dev); + + return domain_translation_struct_show(m, info, dev_pasid->pasid); +} +DEFINE_SHOW_ATTRIBUTE(pasid_domain_translation_struct); =20 static void invalidation_queue_entry_show(struct seq_file *m, struct intel_iommu *iommu) @@ -700,7 +783,7 @@ void intel_iommu_debugfs_create_dev(struct device_domai= n_info *info) info->debugfs_dentry =3D debugfs_create_dir(dev_name(info->dev), intel_io= mmu_debug); =20 debugfs_create_file("domain_translation_struct", 0444, info->debugfs_dent= ry, - NULL, &domain_translation_struct_fops); + info, &dev_domain_translation_struct_fops); } =20 /* Remove the device debugfs directory. */ @@ -726,6 +809,9 @@ void intel_iommu_debugfs_create_dev_pasid(struct dev_pa= sid_info *dev_pasid) =20 sprintf(dir_name, "%x", dev_pasid->pasid); dev_pasid->debugfs_dentry =3D debugfs_create_dir(dir_name, info->debugfs_= dentry); + + debugfs_create_file("domain_translation_struct", 0444, dev_pasid->debugfs= _dentry, + dev_pasid, &pasid_domain_translation_struct_fops); } =20 /* Remove the device pasid debugfs directory. */ --=20 2.21.3