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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 8E3A8C433DF for ; Thu, 11 Jun 2020 12:35:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 706CF20747 for ; Thu, 11 Jun 2020 12:35:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727037AbgFKMfV (ORCPT ); Thu, 11 Jun 2020 08:35:21 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:48872 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726708AbgFKMfU (ORCPT ); Thu, 11 Jun 2020 08:35:20 -0400 Received: from [IPv6:2804:14c:483:73a8::1000] (unknown [IPv6:2804:14c:483:73a8::1000]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: koike) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 334322A4705; Thu, 11 Jun 2020 13:35:17 +0100 (BST) Subject: Re: [PATCH] v4l2-core: Print control name in VIDIOC_S/G_(EXT)_CTRL(S) To: Ezequiel Garcia , linux-media@vger.kernel.org Cc: Hans Verkuil , kernel@collabora.com References: <20200609121514.9414-1-ezequiel@collabora.com> From: Helen Koike Message-ID: Date: Thu, 11 Jun 2020 09:35:14 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200609121514.9414-1-ezequiel@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 6/9/20 9:15 AM, Ezequiel Garcia wrote: > While debugging, it's currently really hard to identify controls > by their ID. Print the control name making the print more helpful. > > With this change, the print changes from: > > video1: VIDIOC_S_EXT_CTRLS: which=0xf010000, count=5, error_idx=4, request_fd=45, id/size=0x990ce8/1048, id/size=0x990ce9/12, id/size=0x990cea/480, id/size=0x990ceb/896, id/size=0x990cec/400 > > to: > > video1: VIDIOC_S_EXT_CTRLS: which=0xf010000, count=5, error_idx=4, request_fd=42, name=H264 Sequence Parameter Set, id/size=0x990ce8/1048, name=H264 Picture Parameter Set, id/size=0x990ce9/12, name=H264 Scaling Matrix, id/size=0x990cea/480, name=H264 Slice Parameters, id/size=0x990ceb/896, name=H264 Decode Parameters, id/size=0x990cec/400 > > For instance, this is specially helpful when the ioctl fails. Consider > the following example: > > v4l2-ctrls: prepare_ext_ctrls: video1: pointer control id 0x990cec size too small, 400 bytes but 784 bytes needed > v4l2-ctrls: try_set_ext_ctrls: video1: video1: try_set_ext_ctrls_common failed (-14) > video1: VIDIOC_S_EXT_CTRLS: error -14: which=0xf010000, count=5, error_idx=5, request_fd=39, name=H264 Sequence Parameter Set, id/size=0x990ce8/1048, name=H264 Picture Parameter Set, id/size=0x990ce9/12, name=H264 Scaling Matrix, id/size=0x990cea/480, name=H264 Slice Parameters, id/size=0x990ceb/896, name=H264 Decode Parameters, id/size=0x990cec/400 > > Signed-off-by: Ezequiel Garcia Thanks Ezequiel, I'll include this in the next RFC. Regards, Helen > --- > drivers/media/v4l2-core/v4l2-ioctl.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > index 2322f08a98be..4264ac44c48b 100644 > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > @@ -582,8 +582,10 @@ static void v4l_print_querymenu(const void *arg, bool write_only) > static void v4l_print_control(const void *arg, bool write_only) > { > const struct v4l2_control *p = arg; > + const char *name = v4l2_ctrl_get_name(p->id); > > - pr_cont("id=0x%x, value=%d\n", p->id, p->value); > + pr_cont("name=%s, id=0x%x, value=%d\n", > + name ? name : "unknown", p->id, p->value); > } > > static void v4l_print_ext_controls(const void *arg, bool write_only) > @@ -594,12 +596,16 @@ static void v4l_print_ext_controls(const void *arg, bool write_only) > pr_cont("which=0x%x, count=%d, error_idx=%d, request_fd=%d", > p->which, p->count, p->error_idx, p->request_fd); > for (i = 0; i < p->count; i++) { > + unsigned int id = p->controls[i].id; > + const char *name = v4l2_ctrl_get_name(id); > + > + name = name ? name : "unknown"; > if (!p->controls[i].size) > - pr_cont(", id/val=0x%x/0x%x", > - p->controls[i].id, p->controls[i].value); > + pr_cont(", name=%s, id/val=0x%x/0x%x", > + name, id, p->controls[i].value); > else > - pr_cont(", id/size=0x%x/%u", > - p->controls[i].id, p->controls[i].size); > + pr_cont(", name=%s, id/size=0x%x/%u", > + name, id, p->controls[i].size); > } > pr_cont("\n"); > } >