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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4CF3810F3DE2 for ; Sat, 28 Mar 2026 10:10:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zEfQ2xHD20u2SNJPKNUNUUMLTWyeWszA9wRDOE62vLc=; b=ZBh5WgIBDRTH1zmIbrLuLoJdvU AFkdRzOI5KyGZc4e3zGgeVNrwQdGuU4MY68GQK83qGkAzN5rfHtcLDhwClOJI1HpvLB97G1iEhMWf o5oEiC4G2dPYW8eEnbwHJ3jnbVt08IJS78QLkU/0hwasY33xboPc2ozpWZGVZ6u6KonBETPevi9lA poVFUzxci6Tdy2paBSKU68npykqdntqBnVMZkWXBbcj+VPT/AgtExNYxzSkWkQ4HDjLuUF/8dojrz B7KOybkZwIz01MMT7yL05PDrDd+IOtVAIBpEvNs5udeqH8CgiGGdIn7pCbedCTxkM7TLP53aQHxeF gfAg7Krg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w6QcJ-00000008oPX-2hIT; Sat, 28 Mar 2026 10:10:08 +0000 Received: from canpmsgout06.his.huawei.com ([113.46.200.221]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w6QcG-00000008oNN-0VYx for linux-arm-kernel@lists.infradead.org; Sat, 28 Mar 2026 10:10:06 +0000 dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=zEfQ2xHD20u2SNJPKNUNUUMLTWyeWszA9wRDOE62vLc=; b=cWsDiIDox67v1VfnLwL3COzpfWl/zHQy+xzjtvGgkgF5nnzZ69dsU/MT5LgpVfsBbXbqEogm1 yi+rkN5uJADT2kmyr5E3gdeQitAdEpzq/yul6Z0nefWUnNcLGzKaS+WKXKMof2ZS9LH0tZY1Bef liOWaPfDh1Tqhwehso/utHE= Received: from mail.maildlp.com (unknown [172.19.163.104]) by canpmsgout06.his.huawei.com (SkyGuard) with ESMTPS id 4fjY4j3Kx0zRhQc; Sat, 28 Mar 2026 18:03:49 +0800 (CST) Received: from kwepemj200003.china.huawei.com (unknown [7.202.194.15]) by mail.maildlp.com (Postfix) with ESMTPS id 2F04C4056A; Sat, 28 Mar 2026 18:09:56 +0800 (CST) Received: from localhost.huawei.com (10.90.31.46) by kwepemj200003.china.huawei.com (7.202.194.15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Sat, 28 Mar 2026 18:09:55 +0800 From: Qinxin Xia To: , , , CC: , , , , , , , , Subject: [RFC PATCH v2 4/5] iommu/arm-smmu-v3: Add device symlink in stream table debugfs Date: Sat, 28 Mar 2026 18:09:52 +0800 Message-ID: <20260328100953.3441915-5-xiaqinxin@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260328100953.3441915-1-xiaqinxin@huawei.com> References: <20260328100953.3441915-1-xiaqinxin@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.90.31.46] X-ClientProxiedBy: kwepems500001.china.huawei.com (7.221.188.70) To kwepemj200003.china.huawei.com (7.202.194.15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260328_031004_814989_83D14281 X-CRM114-Status: GOOD ( 10.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a symlink named under each stream table entry directory pointing to the sysfs directory of the actual device. This aids debugging by providing direct access to device attributes. /sys/kernel/debug/iommu/arm_smmu_v3/smmu0/stream_table/ └── / ├─── ste └─── Signed-off-by: Qinxin Xia --- .../arm/arm-smmu-v3/arm-smmu-v3-debugfs.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-debugfs.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-debugfs.c index 70623b480d64..dbcc8fce6d8e 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-debugfs.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-debugfs.c @@ -8,8 +8,9 @@ * ├── capabilities # SMMU feature capabilities and configuration * ├── registers # SMMU Key registers * └── stream_table - * └─── / # Stream ID 0 - * └── ste # Stream Table Entry + * └─── / # Stream ID + * ├─── ste # Stream Table Entry + * └── # Symlink to device sysfs directory * * The capabilities file provides detailed information about: * - translation stage support (Stage1/Stage2) @@ -31,6 +32,7 @@ #include #include +#include #include #include "arm-smmu-v3.h" @@ -295,6 +297,7 @@ int arm_smmu_debugfs_create_stream_table(struct device *dev, struct dentry *stream_dir, *dev_dir; struct arm_smmu_master *master; struct ste_context *ctx; + char *path, *full_path; char name[64]; u32 sid; int i; @@ -333,6 +336,18 @@ int arm_smmu_debugfs_create_stream_table(struct device *dev, debugfs_create_file("ste", 0444, dev_dir, ctx, &smmu_debugfs_ste_fops); + /* Create a symlink to the device's sysfs directory */ + path = kobject_get_path(&dev->kobj, GFP_KERNEL); + if (!path) + continue; + + full_path = kasprintf(GFP_KERNEL, "/sys%s", path); + if (full_path) { + debugfs_create_symlink(dev_name(dev), dev_dir, full_path); + kfree(full_path); + } + + kfree(path); } return 0; -- 2.33.0