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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73E39C6FD1C for ; Wed, 22 Mar 2023 15:01:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229928AbjCVPBw (ORCPT ); Wed, 22 Mar 2023 11:01:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229482AbjCVPBv (ORCPT ); Wed, 22 Mar 2023 11:01:51 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FCAB11643; Wed, 22 Mar 2023 08:01:50 -0700 (PDT) Received: from pendragon.ideasonboard.com (213-243-189-158.bb.dnainternet.fi [213.243.189.158]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 5B113BC1; Wed, 22 Mar 2023 16:01:47 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1679497307; bh=Az9CmcJ+XBb4olbWe91Aj3r8+M/Mn03lE84beJHYWcQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WKXlws0YL/fxPG1M5ZQGaWla8QrHlrOYNJMXI2o/UFolpE4TobnpdShV9cjraTqeO MwA6homUVXpEZ5ca7dTz/vAQQhQlSiv7sA8a4cprGocH5iNqqFk8jBFOGn1mJ3u5mP wimrpwmLpPfLk6YPVwEV2dY/f3itqV+8uUElZbK8= Date: Wed, 22 Mar 2023 17:01:53 +0200 From: Laurent Pinchart To: Nicolas Dufresne Cc: Hans Verkuil , David Laight , Benjamin Gaignard , "tfiga@chromium.org" , "m.szyprowski@samsung.com" , "mchehab@kernel.org" , "ming.qian@nxp.com" , "shijie.qin@nxp.com" , "eagle.zhou@nxp.com" , "bin.liu@mediatek.com" , "matthias.bgg@gmail.com" , "angelogioacchino.delregno@collabora.com" , "tiffany.lin@mediatek.com" , "andrew-ct.chen@mediatek.com" , "yunfei.dong@mediatek.com" , "stanimir.k.varbanov@gmail.com" , "quic_vgarodia@quicinc.com" , "agross@kernel.org" , "andersson@kernel.org" , "konrad.dybcio@linaro.org" , "ezequiel@vanguardiasur.com.ar" , "p.zabel@pengutronix.de" , "daniel.almeida@collabora.com" , "linux-media@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "linux-rockchip@lists.infradead.org" , "kernel@collabora.com" Subject: Re: [RFC 2/4] media: videobuf2: Replace bufs array by a list Message-ID: <20230322150153.GO20234@pendragon.ideasonboard.com> References: <20230313135916.862852-1-benjamin.gaignard@collabora.com> <20230313135916.862852-3-benjamin.gaignard@collabora.com> <20230313181155.GC22646@pendragon.ideasonboard.com> <86df05244d974416903e919d387a0a0b@AcuMS.aculab.com> <20230319233358.GD20234@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Wed, Mar 22, 2023 at 10:50:52AM -0400, Nicolas Dufresne wrote: > Hi Laurent, > > Le lundi 20 mars 2023 à 01:33 +0200, Laurent Pinchart a écrit : > > > The typical usage is that applications allocate N buffers with the > > > VIDIOC_REQBUFS ioctl, and in most cases that's all they use. > > > > Note that once we get DELETE_BUF (or DELETE_BUFS) support I'd like to > > encourage applications to use the new API, and deprecate REQBUFS > > (dropping it isn't on my radar, as it would take forever before no > > userspace uses it anymore). > > I was wondering if you can extend on this. I'm worried the count semantic might > prevent emulating it over create_bufs() ops, but if that works, did you meant to > emulate it so driver no longer have to implement reqbufs() if they have > create_bufs() ? For drivers it should be fairly simply, as the reqbufs and create_bufs ioctl handlers should just point to the corresponding videobuf2 helpers. What I meant is that I'd like to encourage userspace to use the VIDIOC_CREATE_BUFS ioctl instead of VIDIOC_REQBUFS. -- Regards, Laurent Pinchart 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9F15CC6FD1F for ; Wed, 22 Mar 2023 15:02:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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c=relaxed/simple; d=ideasonboard.com; s=mail; t=1679497307; bh=Az9CmcJ+XBb4olbWe91Aj3r8+M/Mn03lE84beJHYWcQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WKXlws0YL/fxPG1M5ZQGaWla8QrHlrOYNJMXI2o/UFolpE4TobnpdShV9cjraTqeO MwA6homUVXpEZ5ca7dTz/vAQQhQlSiv7sA8a4cprGocH5iNqqFk8jBFOGn1mJ3u5mP wimrpwmLpPfLk6YPVwEV2dY/f3itqV+8uUElZbK8= Date: Wed, 22 Mar 2023 17:01:53 +0200 From: Laurent Pinchart To: Nicolas Dufresne Cc: Hans Verkuil , David Laight , Benjamin Gaignard , "tfiga@chromium.org" , "m.szyprowski@samsung.com" , "mchehab@kernel.org" , "ming.qian@nxp.com" , "shijie.qin@nxp.com" , "eagle.zhou@nxp.com" , "bin.liu@mediatek.com" , "matthias.bgg@gmail.com" , "angelogioacchino.delregno@collabora.com" , "tiffany.lin@mediatek.com" , "andrew-ct.chen@mediatek.com" , "yunfei.dong@mediatek.com" , "stanimir.k.varbanov@gmail.com" , "quic_vgarodia@quicinc.com" , "agross@kernel.org" , "andersson@kernel.org" , "konrad.dybcio@linaro.org" , "ezequiel@vanguardiasur.com.ar" , "p.zabel@pengutronix.de" , "daniel.almeida@collabora.com" , "linux-media@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "linux-rockchip@lists.infradead.org" , "kernel@collabora.com" Subject: Re: [RFC 2/4] media: videobuf2: Replace bufs array by a list Message-ID: <20230322150153.GO20234@pendragon.ideasonboard.com> References: <20230313135916.862852-1-benjamin.gaignard@collabora.com> <20230313135916.862852-3-benjamin.gaignard@collabora.com> <20230313181155.GC22646@pendragon.ideasonboard.com> <86df05244d974416903e919d387a0a0b@AcuMS.aculab.com> <20230319233358.GD20234@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230322_080151_286963_7A9A7186 X-CRM114-Status: GOOD ( 16.04 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Wed, 22 Mar 2023 15:01:54 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pezyJ-00GPw6-0G; Wed, 22 Mar 2023 15:01:52 +0000 Received: from pendragon.ideasonboard.com (213-243-189-158.bb.dnainternet.fi [213.243.189.158]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 5B113BC1; Wed, 22 Mar 2023 16:01:47 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1679497307; bh=Az9CmcJ+XBb4olbWe91Aj3r8+M/Mn03lE84beJHYWcQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WKXlws0YL/fxPG1M5ZQGaWla8QrHlrOYNJMXI2o/UFolpE4TobnpdShV9cjraTqeO MwA6homUVXpEZ5ca7dTz/vAQQhQlSiv7sA8a4cprGocH5iNqqFk8jBFOGn1mJ3u5mP wimrpwmLpPfLk6YPVwEV2dY/f3itqV+8uUElZbK8= Date: Wed, 22 Mar 2023 17:01:53 +0200 From: Laurent Pinchart To: Nicolas Dufresne Cc: Hans Verkuil , David Laight , Benjamin Gaignard , "tfiga@chromium.org" , "m.szyprowski@samsung.com" , "mchehab@kernel.org" , "ming.qian@nxp.com" , "shijie.qin@nxp.com" , "eagle.zhou@nxp.com" , "bin.liu@mediatek.com" , "matthias.bgg@gmail.com" , "angelogioacchino.delregno@collabora.com" , "tiffany.lin@mediatek.com" , "andrew-ct.chen@mediatek.com" , "yunfei.dong@mediatek.com" , "stanimir.k.varbanov@gmail.com" , "quic_vgarodia@quicinc.com" , "agross@kernel.org" , "andersson@kernel.org" , "konrad.dybcio@linaro.org" , "ezequiel@vanguardiasur.com.ar" , "p.zabel@pengutronix.de" , "daniel.almeida@collabora.com" , "linux-media@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "linux-rockchip@lists.infradead.org" , "kernel@collabora.com" Subject: Re: [RFC 2/4] media: videobuf2: Replace bufs array by a list Message-ID: <20230322150153.GO20234@pendragon.ideasonboard.com> References: <20230313135916.862852-1-benjamin.gaignard@collabora.com> <20230313135916.862852-3-benjamin.gaignard@collabora.com> <20230313181155.GC22646@pendragon.ideasonboard.com> <86df05244d974416903e919d387a0a0b@AcuMS.aculab.com> <20230319233358.GD20234@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230322_080151_286963_7A9A7186 X-CRM114-Status: GOOD ( 16.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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