From patchwork Mon Mar 13 17:02:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenghua Yu X-Patchwork-Id: 13172967 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 90C82C7618E for ; Mon, 13 Mar 2023 17:07:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231359AbjCMRHK (ORCPT ); Mon, 13 Mar 2023 13:07:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231483AbjCMRGl (ORCPT ); Mon, 13 Mar 2023 13:06:41 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF6A87F01F; Mon, 13 Mar 2023 10:06:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678727164; x=1710263164; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U1FC6TvDrEJVxS1ZALZrUjW7uENM7EPrWiu39Wh5u84=; b=FHsPgXcLdH+8zZemriZhfqkjsxErnr3JK/3MVAAtDFe6Y9ePsEEGVN4U +0Jup3ANSRjVa5ROSO3wgGgn7zLXWRACMiquflbfP1sZwTqJ4OR7zAwXq W6jaE3jWg7H6iJ26IRDUITEJZvYGCl55Xs+eYAeCWsQkqbnYGqO8oBdGk q8r+SIf8QueRdzdwA3XoBa9MUysDmpCNuXJcw17WA8o2OKlQ6/EszDoIc bOZsfsa6ViT9J0zbE3vk/N2EAwjRW4uadFugTooMg9KYD2/NSayJng9va 4g7nYa4XEBAtrs5u+oDE7scJcMl7IMHTsjY1KPY+Rabd0HI4XHdZ57cx0 w==; X-IronPort-AV: E=McAfee;i="6500,9779,10648"; a="334679696" X-IronPort-AV: E=Sophos;i="5.98,257,1673942400"; d="scan'208";a="334679696" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2023 10:02:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10648"; a="708950959" X-IronPort-AV: E=Sophos;i="5.98,257,1673942400"; d="scan'208";a="708950959" Received: from fyu1.sc.intel.com ([172.25.103.126]) by orsmga008.jf.intel.com with ESMTP; 13 Mar 2023 10:02:43 -0700 From: Fenghua Yu To: "Vinod Koul" , "Dave Jiang" Cc: dmaengine@vger.kernel.org, "linux-kernel" , Tony Zhu , Fenghua Yu Subject: [PATCH v3 15/16] dmaengine: idxd: add pid to exported sysfs attribute for opened file Date: Mon, 13 Mar 2023 10:02:18 -0700 Message-Id: <20230313170219.1956012-16-fenghua.yu@intel.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230313170219.1956012-1-fenghua.yu@intel.com> References: <20230313170219.1956012-1-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 d93d26834dc7..3d905087cbff 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -49,6 +49,7 @@ 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); @@ -78,9 +79,18 @@ 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 }; @@ -238,6 +248,7 @@ 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);