From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B90CC04ABB for ; Wed, 12 Sep 2018 00:10:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E44A520882 for ; Wed, 12 Sep 2018 00:10:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E44A520882 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728204AbeILFMX (ORCPT ); Wed, 12 Sep 2018 01:12:23 -0400 Received: from mga03.intel.com ([134.134.136.65]:25689 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728059AbeILFMM (ORCPT ); Wed, 12 Sep 2018 01:12:12 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Sep 2018 17:10:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,362,1531810800"; d="scan'208";a="72213175" Received: from sohilbuildbox.sc.intel.com (HELO localhost.localdomain) ([172.25.110.4]) by orsmga007.jf.intel.com with ESMTP; 11 Sep 2018 17:10:15 -0700 From: Sohil Mehta To: Joerg Roedel Cc: Ashok Raj , David Woodhouse , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Jacob Pan , Gayatri Kammela , Sohil Mehta , Ravi V Shankar , Andy Shevchenko , Lu Baolu , Fenghua Yu Subject: [PATCH v8 6/6] iommu/vt-d: Add debugfs support to show context internals Date: Tue, 11 Sep 2018 17:11:41 -0700 Message-Id: <20180912001141.64025-7-sohil.mehta@intel.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180912001141.64025-1-sohil.mehta@intel.com> References: <20180912001141.64025-1-sohil.mehta@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Export Intel IOMMU DMA remapping internal states, such as root and context table entries in debugfs. Example of such dump in Kabylake: /sys/kernel/debug/iommu/intel/dmar_translation_struct IOMMU dmar0: Root Table Address:45699c000 Root Table Entries: Bus: 0 H: 0 L: 45699f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 16 00:02.0 102 45699e005 IOMMU dmar1: Root Table Address:45699d000 Root Table Entries: Bus: 0 H: 0 L: 45644f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 160 00:14.0 102 45644e001 184 00:17.0 302 456310001 248 00:1f.0 202 4564bf001 Cc: Lu Baolu Cc: Fenghua Yu Cc: Ashok Raj Cc: Jacob Pan Co-Developed-by: Gayatri Kammela Signed-off-by: Gayatri Kammela Reviewed-by: Andy Shevchenko Reviewed-by: Lu Baolu Signed-off-by: Sohil Mehta --- v8: Remove extended context support since it is deprecated in the new spec Use iommu lock to protect context table access Simplify and split the patches differently v7: Split patch 1/5 and 2/5 differently Update commit message and copyright year Fix typo in a comment Simplify code v6: Change the order of includes to an alphabetical order Change seq_printf formatting v5: Change to a SPDX license tag Fix seq_printf formatting v4: Remove the unused function parameter Fix checkpatch.pl warnings Remove error reporting for debugfs_create_file function Fix unnecessary reprogramming of the context entries Simplify and merge the show context and extended context patch into one Remove redundant IOMMU null check under for_each_active_iommu v3: Add a macro for seq file operations Change the intel_iommu_ctx file name to dmar_translation_struct v2: No change drivers/iommu/intel-iommu-debugfs.c | 65 +++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c index 2becbd78620f..7fabf9b1c2dc 100644 --- a/drivers/iommu/intel-iommu-debugfs.c +++ b/drivers/iommu/intel-iommu-debugfs.c @@ -131,6 +131,69 @@ static int iommu_regset_show(struct seq_file *m, void *unused) } DEFINE_SHOW_ATTRIBUTE(iommu_regset); +static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu, + int bus) +{ + struct context_entry *context; + int devfn; + + seq_printf(m, " Context Table Entries for Bus: %d\n", bus); + seq_puts(m, " Entry\tB:D.F\tHigh\tLow\n"); + + for (devfn = 0; devfn < 256; devfn++) { + context = iommu_context_addr(iommu, bus, devfn, 0); + if (!context) + return; + + if (!context_present(context)) + continue; + + seq_printf(m, " %-5d\t%02x:%02x.%x\t%-6llx\t%llx\n", devfn, + bus, PCI_SLOT(devfn), PCI_FUNC(devfn), + context[0].hi, context[0].lo); + } +} + +static void root_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu) +{ + unsigned long flags; + int bus; + + spin_lock_irqsave(&iommu->lock, flags); + seq_printf(m, "IOMMU %s: Root Table Address:%llx\n", iommu->name, + (u64)virt_to_phys(iommu->root_entry)); + seq_puts(m, "Root Table Entries:\n"); + + for (bus = 0; bus < 256; bus++) { + if (!(iommu->root_entry[bus].lo & 1)) + continue; + + seq_printf(m, " Bus: %d H: %llx L: %llx\n", bus, + iommu->root_entry[bus].hi, + iommu->root_entry[bus].lo); + + ctx_tbl_entry_show(m, iommu, bus); + seq_putc(m, '\n'); + } + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static int dmar_translation_struct_show(struct seq_file *m, void *unused) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + root_tbl_entry_show(m, iommu); + seq_putc(m, '\n'); + } + rcu_read_unlock(); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct); + #ifdef CONFIG_IRQ_REMAP static void ir_tbl_remap_entry_show(struct seq_file *m, struct intel_iommu *iommu) @@ -242,6 +305,8 @@ void __init intel_iommu_debugfs_init(void) 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); #ifdef CONFIG_IRQ_REMAP debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug, NULL, &ir_translation_struct_fops); -- 2.18.0