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 1FBD2CD4F54 for ; Wed, 20 May 2026 06:37:43 +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=Vu3EZBeWinYUHPBmY/X090V8/6NEcv7XCtOXv6H294Q=; b=3GEFDRkfcb/N4VzcsorL/LxYsr j4C+khbMmiNozRFGW6ZbEgAPv14Mv04wxJjeziX39yJMPlsel+FcBweuB6J9UNeifPEXoaB9BWRf8 ZhlyuhCKL8Q2cGxJ9EalIHq/JTjsMbB+jir7m862N8DsFgnBMZFZ1P/XFPKZ00ViF7NjA5qUviVYe 9Zk0lDAeA1Ez1X5NjeF8duIoHMcgLFcVb0IBVz+mvbTd65xjNO51AjRKj4VydrpZ6sJvMZJGBiGQc laFMkACOczkxzpGMUp+AIq3yKe5trem5zHhsOv8Y4YwySd5MJqFmWRFtyvCkcrrEBctInTiuoVdCA kYcDg8Ag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPaYm-00000003fya-1au3; Wed, 20 May 2026 06:37:40 +0000 Received: from canpmsgout05.his.huawei.com ([113.46.200.220]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPaYd-00000003fu3-0DxN for linux-arm-kernel@lists.infradead.org; Wed, 20 May 2026 06:37:32 +0000 dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=Vu3EZBeWinYUHPBmY/X090V8/6NEcv7XCtOXv6H294Q=; b=DTUgcXX0QCOxzf8m0FRgEYq6mHvJ8fm5/LaunYVYwK8xC/eRMYpl+bJhsuFUryDpThYXxX4SD zD5E2giVkd242GleR1g//3guxL955J3f6aBVzlkV2nSgD1kadg92DnjwG042X0ideouW+DMHrsE PjSrMIPTDI/RKohWj9cLQ1I= Received: from mail.maildlp.com (unknown [172.19.163.0]) by canpmsgout05.his.huawei.com (SkyGuard) with ESMTPS id 4gL1qt6q77z12LDX; Wed, 20 May 2026 14:30:18 +0800 (CST) Received: from kwepemj200003.china.huawei.com (unknown [7.202.194.15]) by mail.maildlp.com (Postfix) with ESMTPS id 307AB40537; Wed, 20 May 2026 14:37:20 +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; Wed, 20 May 2026 14:37:19 +0800 From: Qinxin Xia To: , , , CC: , , , , , , , , , Subject: [PATCH 4/5] iommu/arm-smmu-v3: Add device symlink in stream table debugfs Date: Wed, 20 May 2026 14:37:10 +0800 Message-ID: <20260520063714.2440584-4-xiaqinxin@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260328101706.3448655-1-xiaqinxin@huawei.com> References: <20260328101706.3448655-1-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: kwepems500002.china.huawei.com (7.221.188.17) To kwepemj200003.china.huawei.com (7.202.194.15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260519_233731_412663_47C8E25C X-CRM114-Status: GOOD ( 12.73 ) 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 --- .../iommu/arm/arm-smmu-v3/arm-smmu-v3-debugfs.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) 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 a5866f34264f..9babc7d640fd 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 @@ -10,6 +10,7 @@ * ├── stream_table * ├── / # 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" @@ -314,6 +316,7 @@ int arm_smmu_debugfs_create_stream_table(struct arm_smmu_device *smmu, struct dentry *stream_dir, *dev_dir; struct arm_smmu_master *master; struct ste_context *ctx; + char *path = NULL, *full_path; char name[64]; u32 sid; int i; @@ -338,6 +341,9 @@ int arm_smmu_debugfs_create_stream_table(struct arm_smmu_device *smmu, if (!master || !master->num_streams) return -ENODEV; + /* Get device sysfs path once, reuse for all streams */ + path = kobject_get_path(&dev->kobj, GFP_KERNEL); + for (i = 0; i < master->num_streams; i++) { sid = master->streams[i].id; snprintf(name, sizeof(name), "%u", sid); @@ -357,8 +363,19 @@ int arm_smmu_debugfs_create_stream_table(struct arm_smmu_device *smmu, spin_unlock(&smmu->debugfs->stream_lock); debugfs_create_file("ste", 0444, dev_dir, ctx, &smmu_debugfs_ste_fops); + + /* Create a symlink to the device's sysfs directory */ + if (path) { + 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