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=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 665A8C433B4 for ; Tue, 6 Apr 2021 13:49:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A6AD61279 for ; Tue, 6 Apr 2021 13:49:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344722AbhDFNtg (ORCPT ); Tue, 6 Apr 2021 09:49:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:35190 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232452AbhDFNtd (ORCPT ); Tue, 6 Apr 2021 09:49:33 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0090D61246; Tue, 6 Apr 2021 13:49:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617716965; bh=AHTodKbzDwdE4aT+sGBqYSzfgMa+SmLxo8yj2F+6ktU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=l8XVzr8pCamhBopVmKZDH1S/qhaNTTX6x5IgAXtZDVjhyYDucCaW/YPHzw/NdvDAO UcX5g9zsj0ofonVWjLzmzoQpioJDQujm2xCHsNkPljKqp36ohQ8gPFQIsTxulg3hax 9fUWtdIO+GunlUTPcyp+qpQhbxZR6jn4ic30VSag= Date: Tue, 6 Apr 2021 15:49:23 +0200 From: Greg KH To: Yicong Yang Cc: alexander.shishkin@linux.intel.com, helgaas@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, jonathan.cameron@huawei.com, song.bao.hua@hisilicon.com, prime.zeng@huawei.com, linux-doc@vger.kernel.org, linuxarm@huawei.com Subject: Re: [PATCH 0/4] Add support for HiSilicon PCIe Tune and Trace device Message-ID: References: <1617713154-35533-1-git-send-email-yangyicong@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1617713154-35533-1-git-send-email-yangyicong@hisilicon.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 06, 2021 at 08:45:50PM +0800, Yicong Yang wrote: > HiSilicon PCIe tune and trace device(PTT) is a PCIe Root Complex > integrated Endpoint(RCiEP) device, providing the capability > to dynamically monitor and tune the PCIe traffic(tune), > and trace the TLP headers(trace). The driver exposes the user > interface through debugfs, so no need for extra user space tools. > The usage is described in the document. Why use debugfs and not the existing perf tools for debugging? thanks, greg k-h