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=-8.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham 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 3F421C43219 for ; Sat, 4 May 2019 07:03:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C5F02085A for ; Sat, 4 May 2019 07:03:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556953432; bh=06o88Q/xn9ojq7khzJkjBbDh8svWhXIRLYGsoQ+OuOU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=fzvuLYTbwirn2LoY9iOOTBQbPi3kwhVikxJSBlaJmChvud/vsohaXDsi5rZMwN7VY 08SFcC6MQxElDBGMtNN4NhLV2tyEaH9NasUjLHYPaEYMmrtw/Ms5uhC+uZmSvs06I0 mQbMrADEx98p29UGoTaqspdtQrdKjXvAtxygXNGk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727063AbfEDHDu (ORCPT ); Sat, 4 May 2019 03:03:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:42438 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725802AbfEDHDu (ORCPT ); Sat, 4 May 2019 03:03:50 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7F73B206BB; Sat, 4 May 2019 07:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556953429; bh=06o88Q/xn9ojq7khzJkjBbDh8svWhXIRLYGsoQ+OuOU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=k2W1wzdjSC/WyY75j2/5/XcF4xTYDy7KFkG4lNjz+dD+W1OVD6XRKOqh+hTQQWWeN CIn2qtCmCOEaAPJzbK/hpphO2vJsIfwtidaHr5ZTcrJbQ7IKclRdskff34c3G1u3ts yE6NEl2TvI321zfcx7XCuJrB0q/5kfJrHMuw0GUM= Date: Sat, 4 May 2019 09:03:46 +0200 From: Greg KH To: Pierre-Louis Bossart Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, vkoul@kernel.org, liam.r.girdwood@linux.intel.com, jank@cadence.com, joe@perches.com, srinivas.kandagatla@linaro.org, Sanyog Kale Subject: Re: [RFC PATCH 6/7] soundwire: cadence_master: add debugfs register dump Message-ID: <20190504070346.GE9770@kroah.com> References: <20190504010030.29233-1-pierre-louis.bossart@linux.intel.com> <20190504010030.29233-7-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190504010030.29233-7-pierre-louis.bossart@linux.intel.com> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 03, 2019 at 08:00:29PM -0500, Pierre-Louis Bossart wrote: > Add debugfs file to dump the Cadence master registers > > Credits: this patch is based on an earlier internal contribution by > Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah. The main change > is the use of scnprintf to avoid known issues with snprintf. > > Signed-off-by: Pierre-Louis Bossart > --- > drivers/soundwire/cadence_master.c | 98 ++++++++++++++++++++++++++++++ > drivers/soundwire/cadence_master.h | 5 ++ > 2 files changed, 103 insertions(+) > > diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c > index 682789bb8ab3..e9c30f18ce25 100644 > --- a/drivers/soundwire/cadence_master.c > +++ b/drivers/soundwire/cadence_master.c > @@ -8,6 +8,7 @@ > > #include > #include > +#include > #include > #include > #include > @@ -222,6 +223,103 @@ static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) > return -EAGAIN; > } > > +/* > + * debugfs > + */ > + > +#define RD_BUF (2 * PAGE_SIZE) > + > +static ssize_t cdns_sprintf(struct sdw_cdns *cdns, > + char *buf, size_t pos, unsigned int reg) > +{ > + return scnprintf(buf + pos, RD_BUF - pos, > + "%4x\t%4x\n", reg, cdns_readl(cdns, reg)); > +} > + > +static ssize_t cdns_reg_read(struct file *file, char __user *user_buf, > + size_t count, loff_t *ppos) > +{ > + struct sdw_cdns *cdns = file->private_data; > + char *buf; > + ssize_t ret; > + int i, j; > + > + buf = kzalloc(RD_BUF, GFP_KERNEL); > + if (!buf) > + return -ENOMEM; > + > + ret = scnprintf(buf, RD_BUF, "Register Value\n"); > + ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); > + for (i = 0; i < 8; i++) /* 8 MCP registers */ > + ret += cdns_sprintf(cdns, buf, ret, i * 4); > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nStatus & Intr Registers\n"); > + for (i = 0; i < 13; i++) /* 13 Status & Intr registers */ > + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_STAT + i * 4); > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nSSP & Clk ctrl Registers\n"); > + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); > + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); > + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); > + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nDPn B0 Registers\n"); > + for (i = 0; i < 7; i++) { > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nDP-%d\n", i); > + for (j = 0; j < 6; j++) > + ret += cdns_sprintf(cdns, buf, ret, > + CDNS_DPN_B0_CONFIG(i) + j * 4); > + } > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nDPn B1 Registers\n"); > + for (i = 0; i < 7; i++) { > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nDP-%d\n", i); > + > + for (j = 0; j < 6; j++) > + ret += cdns_sprintf(cdns, buf, ret, > + CDNS_DPN_B1_CONFIG(i) + j * 4); > + } > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nDPn Control Registers\n"); > + for (i = 0; i < 7; i++) > + ret += cdns_sprintf(cdns, buf, ret, > + CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); > + > + ret += scnprintf(buf + ret, RD_BUF - ret, > + "\nPDIn Config Registers\n"); > + for (i = 0; i < 7; i++) > + ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); > + > + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); > + kfree(buf); > + > + return ret; > +} > + > +static const struct file_operations cdns_reg_fops = { > + .open = simple_open, > + .read = cdns_reg_read, > + .llseek = default_llseek, > +}; > + > +/** > + * sdw_cdns_debugfs_init() - Cadence debugfs init > + * @cdns: Cadence instance > + * @root: debugfs root > + */ > +void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) > +{ > + debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); > +} > +EXPORT_SYMBOL(sdw_cdns_debugfs_init); Don't wrap debugfs calls with export symbol without using EXPORT_SYMBOL_GPL() or you will get grumpy emails from me :) thanks, greg k-h