From patchwork Mon Mar 6 16:31:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenghua Yu X-Patchwork-Id: 13161806 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 B08D3C678D4 for ; Mon, 6 Mar 2023 16:45:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230169AbjCFQp5 (ORCPT ); Mon, 6 Mar 2023 11:45:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230430AbjCFQoq (ORCPT ); Mon, 6 Mar 2023 11:44:46 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 344733E0B9; Mon, 6 Mar 2023 08:44:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678121052; x=1709657052; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7mSzveSNY4kQknpqyVT1O/9858OwAEHn5l3ARji8dAY=; b=OfDxNkdPUD3viI0Z/KfUkMLfwX4gGiKs/rRMhQP2WeRr/A+U/LaYKjpg 5GicFpOik0CHwkgfDhgBEsszrDyu/HsVcqy4aaM02fSTLUIBYDheydy36 Obmkwwv7udFJ3mgwzqMRB3oljDxHy74k6R5JpVKJuhnUxv4fD0GKQwp/v d3lv/J3pR1vRRdv0Hu+Z2iCKFJmaaOHRrC1EjNEuTHSNZhzG+w71cwURy B50UjetpjF4/XWIzkcw0trKbDx+fvfKfYbzsjwrDYWAdMbBm9mELGVFEP mA7tdN9DkkykRLcyp3JQXD6/sthGrGa4c0TZcbxf1x4qM6NRllHUNCsbU Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="398181189" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="398181189" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 08:31:59 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="669504562" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="669504562" Received: from fyu1.sc.intel.com ([172.25.103.126]) by orsmga007.jf.intel.com with ESMTP; 06 Mar 2023 08:31:59 -0800 From: Fenghua Yu To: "Vinod Koul" , "Dave Jiang" Cc: dmaengine@vger.kernel.org, "linux-kernel" , Tony Zhu , Fenghua Yu Subject: [PATCH v2 15/16] dmaengine: idxd: add pid to exported sysfs attribute for opened file Date: Mon, 6 Mar 2023 08:31:37 -0800 Message-Id: <20230306163138.587484-16-fenghua.yu@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230306163138.587484-1-fenghua.yu@intel.com> References: <20230306163138.587484-1-fenghua.yu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Dave Jiang Provide the pid of the application for the opened file. This allows the monitor daemon to easily correlate which app opened the file and easily kill the app by pid if that is desired action. Tested-by: Tony Zhu Signed-off-by: Dave Jiang Co-developed-by: Fenghua Yu Signed-off-by: Fenghua Yu --- Documentation/ABI/stable/sysfs-driver-dma-idxd | 8 ++++++++ drivers/dma/idxd/cdev.c | 11 +++++++++++ 2 files changed, 19 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd index 73ab86196a41..5d0df57f5298 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -335,3 +335,11 @@ Description: Show the number of Completion Record (CR) faults failures that this driver cannot fault in the address for the CR. Typically this is caused by a bad address programmed in the submitted descriptor or a malicious submitter is using bad CR address on purpose. + +What: /sys/bus/dsa/devices/wq./dsa\!wq./file/pid +Date: Sept 14, 2022 +KernelVersion: 6.4.0 +Contact: dmaengine@vger.kernel.org +Description: Show the process id of the application that opened the file. This is + helpful information for a monitor daemon that wants to kill the + application that opened the file. diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index 9fc6565bf807..e124f0628f1c 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -47,6 +47,7 @@ struct idxd_user_context { struct idxd_dev idxd_dev; u64 counters[COUNTER_MAX]; int id; + pid_t pid; }; static void idxd_cdev_evl_drain_pasid(struct idxd_wq *wq, u32 pasid); @@ -76,9 +77,18 @@ static ssize_t cr_fault_failures_show(struct device *dev, } static DEVICE_ATTR_RO(cr_fault_failures); +static ssize_t pid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct idxd_user_context *ctx = dev_to_uctx(dev); + + return sysfs_emit(buf, "%u\n", ctx->pid); +} +static DEVICE_ATTR_RO(pid); + static struct attribute *cdev_file_attributes[] = { &dev_attr_cr_faults.attr, &dev_attr_cr_fault_failures.attr, + &dev_attr_pid.attr, NULL }; @@ -236,6 +246,7 @@ static int idxd_cdev_open(struct inode *inode, struct file *filp) ctx->wq = wq; filp->private_data = ctx; + ctx->pid = current->pid; if (device_user_pasid_enabled(idxd)) { sva = iommu_sva_bind_device(dev, current->mm);