[{"id":3071,"web_url":"https://patchwork.libcamera.org/comment/3071/","msgid":"<20191118191442.GF4888@pendragon.ideasonboard.com>","date":"2019-11-18T19:14:42","subject":"Re: [libcamera-devel] [RFC 03/12] libcamera: pipeline: Add helper\n\tto find request from buffer","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/people/2/","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"content":"Hi Niklas,\n\nThank you for the patch.\n\nOn Mon, Oct 28, 2019 at 03:25:16AM +0100, Niklas Söderlund wrote:\n> The pipeline knows which buffer coming from the application belongs to\n> which request. Add a helper to allow pipeline implementations to access\n> this knowledge.\n> \n> Signed-off-by: Niklas Söderlund \n\nWhy is this needed, given that Buffer stores a pointer to Request ? I\nassume I'll find out later in the series, but it seems more efficient to\nrely on the pointer.\n\n> ---\n> src/libcamera/include/pipeline_handler.h | 2 ++\n> src/libcamera/pipeline_handler.cpp | 10 ++++++++++\n> 2 files changed, 12 insertions(+)\n> \n> diff --git a/src/libcamera/include/pipeline_handler.h b/src/libcamera/include/pipeline_handler.h\n> index 320740746bc6e998..6024357e266c2e2b 100644\n> --- a/src/libcamera/include/pipeline_handler.h\n> +++ b/src/libcamera/include/pipeline_handler.h\n> @@ -39,6 +39,8 @@ public:\n> \t}\n> \tvirtual ~CameraData() {}\n> \n> +\tRequest *requestFromBuffer(Buffer *buffer);\n> +\n> \tCamera *camera_;\n> \tPipelineHandler *pipe_;\n> \tstd::list queuedRequests_;\n> diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp\n> index f9ae767d529d44d9..d70e286661aded8e 100644\n> --- a/src/libcamera/pipeline_handler.cpp\n> +++ b/src/libcamera/pipeline_handler.cpp\n> @@ -58,6 +58,16 @@ LOG_DEFINE_CATEGORY(Pipeline)\n> * exists.\n> */\n> \n> +Request *CameraData::requestFromBuffer(Buffer *buffer)\n> +{\n> +\tfor (Request *request : queuedRequests_)\n> +\t\tfor (const auto &it : request->buffers())\n> +\t\t\tif (it.second == buffer)\n> +\t\t\t\treturn request;\n> +\n> +\treturn nullptr;\n> +}\n> +\n> /**\n> * \\var CameraData::camera_\n> * \\brief The camera related to this CameraData instance","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2492A60F1C\n\tfor ;\n\tMon, 18 Nov 2019 20:15:01 +0100 (CET)","from pendragon.ideasonboard.com (unknown [38.98.37.142])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 29C76311;\n\tMon, 18 Nov 2019 20:14:58 +0100 (CET)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1574104500;\n\tbh=LW3nVVL8YM4I6OvYnKrWre0b+SuGXN69vVyYhXIOVX8=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=Lppkfs+MHCXPZNvS6BuEJqOcNiP0SCg7MmDTUqxqH0vuF29twKvcOiUDzQE9/dX+O\n\t3QNndqJF6vIhw3fONYivwm9UFiKEIllCQLPkRtjq0ADzAqup663oOu5cWXic07Fft3\n\txGWKPZRy6uftUZyhzGNnZkn4Pqrx97wJCzl5Vq5s=","Date":"Mon, 18 Nov 2019 21:14:42 +0200","From":"Laurent Pinchart ","To":"Niklas =?utf-8?q?S=C3=B6derlund?= ","Cc":"libcamera-devel@lists.libcamera.org","Message-ID":"<20191118191442.GF4888@pendragon.ideasonboard.com>","References":"<20191028022525.796995-1-niklas.soderlund@ragnatech.se>\n\t<20191028022525.796995-4-niklas.soderlund@ragnatech.se>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"<20191028022525.796995-4-niklas.soderlund@ragnatech.se>","User-Agent":"Mutt/1.10.1 (2018-07-13)","Subject":"Re: [libcamera-devel] [RFC 03/12] libcamera: pipeline: Add helper\n\tto find request from buffer","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Mon, 18 Nov 2019 19:15:01 -0000"}},{"id":3120,"web_url":"https://patchwork.libcamera.org/comment/3120/","msgid":"<20191120163356.GA10793@bigcity.dyn.berto.se>","date":"2019-11-20T16:33:56","subject":"Re: [libcamera-devel] [RFC 03/12] libcamera: pipeline: Add helper\n\tto find request from buffer","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/people/5/","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"content":"Hi Laurent,\n\nThanks for your feedback.\n\nOn 2019-11-18 21:14:42 +0200, Laurent Pinchart wrote:\n> Hi Niklas,\n> \n> Thank you for the patch.\n> \n> On Mon, Oct 28, 2019 at 03:25:16AM +0100, Niklas Söderlund wrote:\n> > The pipeline knows which buffer coming from the application belongs to\n> > which request. Add a helper to allow pipeline implementations to access\n> > this knowledge.\n> > \n> > Signed-off-by: Niklas Söderlund \n> \n> Why is this needed, given that Buffer stores a pointer to Request ? I\n> assume I'll find out later in the series, but it seems more efficient to\n> rely on the pointer.\n\nThis is needed as the Buffer will no longer keep a reference to a \nRequest.\n\n> \n> > ---\n> > src/libcamera/include/pipeline_handler.h | 2 ++\n> > src/libcamera/pipeline_handler.cpp | 10 ++++++++++\n> > 2 files changed, 12 insertions(+)\n> > \n> > diff --git a/src/libcamera/include/pipeline_handler.h b/src/libcamera/include/pipeline_handler.h\n> > index 320740746bc6e998..6024357e266c2e2b 100644\n> > --- a/src/libcamera/include/pipeline_handler.h\n> > +++ b/src/libcamera/include/pipeline_handler.h\n> > @@ -39,6 +39,8 @@ public:\n> > \t}\n> > \tvirtual ~CameraData() {}\n> > \n> > +\tRequest *requestFromBuffer(Buffer *buffer);\n> > +\n> > \tCamera *camera_;\n> > \tPipelineHandler *pipe_;\n> > \tstd::list queuedRequests_;\n> > diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp\n> > index f9ae767d529d44d9..d70e286661aded8e 100644\n> > --- a/src/libcamera/pipeline_handler.cpp\n> > +++ b/src/libcamera/pipeline_handler.cpp\n> > @@ -58,6 +58,16 @@ LOG_DEFINE_CATEGORY(Pipeline)\n> > * exists.\n> > */\n> > \n> > +Request *CameraData::requestFromBuffer(Buffer *buffer)\n> > +{\n> > +\tfor (Request *request : queuedRequests_)\n> > +\t\tfor (const auto &it : request->buffers())\n> > +\t\t\tif (it.second == buffer)\n> > +\t\t\t\treturn request;\n> > +\n> > +\treturn nullptr;\n> > +}\n> > +\n> > /**\n> > * \\var CameraData::camera_\n> > * \\brief The camera related to this CameraData instance\n> \n> -- \n> Regards,\n> \n> Laurent Pinchart","headers":{"Return-Path":"","Received":["from mail-lf1-x144.google.com (mail-lf1-x144.google.com\n\t[IPv6:2a00:1450:4864:20::144])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 0806C60C21\n\tfor ;\n\tWed, 20 Nov 2019 17:33:59 +0100 (CET)","by mail-lf1-x144.google.com with SMTP id f18so50962lfj.6\n\tfor ;\n\tWed, 20 Nov 2019 08:33:58 -0800 (PST)","from localhost (h-93-159.A463.priv.bahnhof.se. 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Add a helper to allow pipeline implementations to access\n> > > this knowledge.\n> > > \n> > > Signed-off-by: Niklas Söderlund \n> > \n> > Why is this needed, given that Buffer stores a pointer to Request ? I\n> > assume I'll find out later in the series, but it seems more efficient to\n> > rely on the pointer.\n> \n> This is needed as the Buffer will no longer keep a reference to a \n> Request.\n\nBut why can't it keep a reference to a request ? I understand the Buffer\nobject won't be transient anymore, but can't we still have a request\npointer, that will only be valid from the time the buffer is added to\nthe request to the time the request completes ? As long as we document\nthe lifetime of that pointer, I think it should be fine.\n\n> > > ---\n> > > src/libcamera/include/pipeline_handler.h | 2 ++\n> > > src/libcamera/pipeline_handler.cpp | 10 ++++++++++\n> > > 2 files changed, 12 insertions(+)\n> > > \n> > > diff --git a/src/libcamera/include/pipeline_handler.h b/src/libcamera/include/pipeline_handler.h\n> > > index 320740746bc6e998..6024357e266c2e2b 100644\n> > > --- a/src/libcamera/include/pipeline_handler.h\n> > > +++ b/src/libcamera/include/pipeline_handler.h\n> > > @@ -39,6 +39,8 @@ public:\n> > > \t}\n> > > \tvirtual ~CameraData() {}\n> > > \n> > > +\tRequest *requestFromBuffer(Buffer *buffer);\n> > > +\n> > > \tCamera *camera_;\n> > > \tPipelineHandler *pipe_;\n> > > \tstd::list queuedRequests_;\n> > > diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp\n> > > index f9ae767d529d44d9..d70e286661aded8e 100644\n> > > --- a/src/libcamera/pipeline_handler.cpp\n> > > +++ b/src/libcamera/pipeline_handler.cpp\n> > > @@ -58,6 +58,16 @@ LOG_DEFINE_CATEGORY(Pipeline)\n> > > * exists.\n> > > */\n> > > \n> > > +Request *CameraData::requestFromBuffer(Buffer *buffer)\n> > > +{\n> > > +\tfor (Request *request : queuedRequests_)\n> > > +\t\tfor (const auto &it : request->buffers())\n> > > +\t\t\tif (it.second == buffer)\n> > > +\t\t\t\treturn request;\n> > > +\n> > > +\treturn nullptr;\n> > > +}\n> > > +\n> > > /**\n> > > * \\var CameraData::camera_\n> > > * \\brief The camera related to this CameraData instance","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 87F976136C\n\tfor ;\n\tThu, 21 Nov 2019 04:12:03 +0100 (CET)","from pendragon.ideasonboard.com (unknown [124.219.31.93])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E431497D;\n\tThu, 21 Nov 2019 04:12:01 +0100 (CET)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1574305923;\n\tbh=0wMQxpWDzAw2f72bYTqcGaPYn6MWGhUcXcPnvc6tg+s=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=mldzF7a/FvopchscdmS4Mn+yl+QJOgtJjDuJ2b1T+P9MVuywvA1Eu9T4Rif9Jbx28\n\tlhrt6FwQL0iXIOPQJ10QOQJB8sc03JZ2cinKNWbBfPJUcdLFKY8nFIstzXuskT5fd2\n\tG3NDbSStXt8YjuGfTnvfx8TZpEPpcgu9W4DkXEs8=","Date":"Thu, 21 Nov 2019 05:11:53 +0200","From":"Laurent Pinchart ","To":"Niklas =?utf-8?q?S=C3=B6derlund?= ","Cc":"libcamera-devel@lists.libcamera.org","Message-ID":"<20191121031153.GC4958@pendragon.ideasonboard.com>","References":"<20191028022525.796995-1-niklas.soderlund@ragnatech.se>\n\t<20191028022525.796995-4-niklas.soderlund@ragnatech.se>\n\t<20191118191442.GF4888@pendragon.ideasonboard.com>\n\t<20191120163356.GA10793@bigcity.dyn.berto.se>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"<20191120163356.GA10793@bigcity.dyn.berto.se>","User-Agent":"Mutt/1.10.1 (2018-07-13)","Subject":"Re: [libcamera-devel] [RFC 03/12] libcamera: pipeline: Add helper\n\tto find request from buffer","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Thu, 21 Nov 2019 03:12:03 -0000"}},{"id":3132,"web_url":"https://patchwork.libcamera.org/comment/3132/","msgid":"<20191121210445.GD10793@bigcity.dyn.berto.se>","date":"2019-11-21T21:04:45","subject":"Re: [libcamera-devel] [RFC 03/12] libcamera: pipeline: Add helper\n\tto find request from buffer","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/people/5/","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"content":"Hi Laurent,\n\nOn 2019-11-21 05:11:53 +0200, Laurent Pinchart wrote:\n> Hi Niklas,\n> \n> On Wed, Nov 20, 2019 at 05:33:56PM +0100, Niklas Söderlund wrote:\n> > On 2019-11-18 21:14:42 +0200, Laurent Pinchart wrote:\n> > > On Mon, Oct 28, 2019 at 03:25:16AM +0100, Niklas Söderlund wrote:\n> > > > The pipeline knows which buffer coming from the application belongs to\n> > > > which request. Add a helper to allow pipeline implementations to access\n> > > > this knowledge.\n> > > > \n> > > > Signed-off-by: Niklas Söderlund \n> > > \n> > > Why is this needed, given that Buffer stores a pointer to Request ? I\n> > > assume I'll find out later in the series, but it seems more efficient to\n> > > rely on the pointer.\n> > \n> > This is needed as the Buffer will no longer keep a reference to a \n> > Request.\n> \n> But why can't it keep a reference to a request ? I understand the Buffer\n> object won't be transient anymore, but can't we still have a request\n> pointer, that will only be valid from the time the buffer is added to\n> the request to the time the request completes ? As long as we document\n> the lifetime of that pointer, I think it should be fine.\n\nYou convinced me, I have restored the request reference in the next \nversion.\n\n> \n> > > > ---\n> > > > src/libcamera/include/pipeline_handler.h | 2 ++\n> > > > src/libcamera/pipeline_handler.cpp | 10 ++++++++++\n> > > > 2 files changed, 12 insertions(+)\n> > > > \n> > > > diff --git a/src/libcamera/include/pipeline_handler.h b/src/libcamera/include/pipeline_handler.h\n> > > > index 320740746bc6e998..6024357e266c2e2b 100644\n> > > > --- a/src/libcamera/include/pipeline_handler.h\n> > > > +++ b/src/libcamera/include/pipeline_handler.h\n> > > > @@ -39,6 +39,8 @@ public:\n> > > > \t}\n> > > > \tvirtual ~CameraData() {}\n> > > > \n> > > > +\tRequest *requestFromBuffer(Buffer *buffer);\n> > > > +\n> > > > \tCamera *camera_;\n> > > > \tPipelineHandler *pipe_;\n> > > > \tstd::list queuedRequests_;\n> > > > diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp\n> > > > index f9ae767d529d44d9..d70e286661aded8e 100644\n> > > > --- a/src/libcamera/pipeline_handler.cpp\n> > > > +++ b/src/libcamera/pipeline_handler.cpp\n> > > > @@ -58,6 +58,16 @@ LOG_DEFINE_CATEGORY(Pipeline)\n> > > > * exists.\n> > > > */\n> > > > \n> > > > +Request *CameraData::requestFromBuffer(Buffer *buffer)\n> > > > +{\n> > > > +\tfor (Request *request : queuedRequests_)\n> > > > +\t\tfor (const auto &it : request->buffers())\n> > > > +\t\t\tif (it.second == buffer)\n> > > > +\t\t\t\treturn request;\n> > > > +\n> > > > +\treturn nullptr;\n> > > > +}\n> > > > +\n> > > > /**\n> > > > * \\var CameraData::camera_\n> > > > * \\brief The camera related to this CameraData instance\n> \n> -- \n> Regards,\n> \n> Laurent Pinchart","headers":{"Return-Path":"","Received":["from mail-lj1-x243.google.com (mail-lj1-x243.google.com\n\t[IPv6:2a00:1450:4864:20::243])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 0FC3060C22\n\tfor ;\n\tThu, 21 Nov 2019 22:04:47 +0100 (CET)","by mail-lj1-x243.google.com with SMTP id 139so4867681ljf.1\n\tfor ;\n\tThu, 21 Nov 2019 13:04:47 -0800 (PST)","from localhost (h-93-159.A463.priv.bahnhof.se. 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