From patchwork Thu Feb 11 09:08:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gustavo Pimentel X-Patchwork-Id: 1439356 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=synopsys.com header.i=@synopsys.com header.a=rsa-sha256 header.s=mail header.b=c9oa8/Jo; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Dbrch6zQzz9sB4 for ; Thu, 11 Feb 2021 20:17:24 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230182AbhBKJRJ (ORCPT ); Thu, 11 Feb 2021 04:17:09 -0500 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:56634 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230051AbhBKJKs (ORCPT ); Thu, 11 Feb 2021 04:10:48 -0500 Received: from mailhost.synopsys.com (mdc-mailhost1.synopsys.com [10.225.0.209]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 8598FC00C1; Thu, 11 Feb 2021 09:09:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1613034552; bh=xjFl0ry1f4kLV7eWV2SxeXcHKekFmdWi7FGEn+fooAU=; h=From:To:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=c9oa8/JoSw7uSH9p6L4Ib+NqMZwFbIFN25ltKb0zXddqcxTf6q8lJC3R4UCZYzHx+ MMBjrnZtUEjuDl8OGGcPBU7BjTXN1EBRIymoLXpl0DJgss3OgP6AHIegvrV6Kn+Ymh PziBW+HVMDa3YYBScHub/TVmVcnCbf9BOqlnCANwbs0ffJ/crMGLxLRF0y3MdEUbRc 5MScTwJHe7uC5hpWGNloqevPohQygy87OcGgAZPtwbgUh+oJ2cFMLK4aHDYTsC59A1 e5R5+emiwh8cNylEd+4KtNVBVR+XuYV/vYujqQxgGzvX+9m/hxMWWdWKVq9eUDIzoY eTJVhvmctLqrQ== Received: from de02dwia024.internal.synopsys.com (de02dwia024.internal.synopsys.com [10.225.19.81]) by mailhost.synopsys.com (Postfix) with ESMTP id 4AB11A005F; Thu, 11 Feb 2021 09:09:11 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Gustavo Pimentel To: linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Andrew Morton , Greg Kroah-Hartman , Jonathan Corbet , Bjorn Helgaas , Gustavo Pimentel Subject: [PATCH v5 4/6] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver Date: Thu, 11 Feb 2021 10:08:41 +0100 Message-Id: X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add Documentation for dw-xdata-pcie driver. Signed-off-by: Gustavo Pimentel --- Documentation/misc-devices/dw-xdata-pcie.rst | 40 ++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 Documentation/misc-devices/dw-xdata-pcie.rst diff --git a/Documentation/misc-devices/dw-xdata-pcie.rst b/Documentation/misc-devices/dw-xdata-pcie.rst new file mode 100644 index 00000000..3af9fad --- /dev/null +++ b/Documentation/misc-devices/dw-xdata-pcie.rst @@ -0,0 +1,40 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================================================================== +Driver for Synopsys DesignWare PCIe traffic generator (also known as xData) +=========================================================================== + +This driver should be used as a host-side (Root Complex) driver and Synopsys +DesignWare prototype that includes this IP. + +The "dw-xdata-pcie" driver can be used to enable/disable PCIe traffic +generator in either direction (mutual exclusion) besides allowing the +PCIe link performance analysis. + +The interaction with this driver is done through the module parameter and +can be changed in runtime. The driver outputs the requested command state +information to /var/log/kern.log or dmesg. + +Request write TLPs traffic generation - Root Complex to Endpoint direction +- Command: + echo 1 > /sys/kernel/dw-xdata-pcie/write + +Get write TLPs traffic link throughput +- Command: + cat /sys/kernel/dw-xdata-pcie/write +- Output example: + 204 MB/s + +Request read TLPs traffic generation - Endpoint to Root Complex direction: +- Command: + echo 1 > /sys/kernel/dw-xdata-pcie/read + +Get read TLPs traffic link throughput +- Command: + cat /sys/kernel/dw-xdata-pcie/read +- Output example: + 199 MB/s + +Request to stop any current TLP transfer: +- Command: + echo 1 > /sys/kernel/dw-xdata-pcie/stop