From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CDD47168 for ; Sun, 11 Jul 2021 10:29:31 +0000 (UTC) Received: from [192.168.1.107] ([37.4.249.97]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPSA (Nemesis) id 1Mtfa5-1lA9Is0i0V-00v4rH; Sun, 11 Jul 2021 12:29:13 +0200 Subject: Re: [PATCH v3 0/5] vchiq: Patch to separate platform and cdev code To: Ojaswin Mujoo , nsaenz@kernel.org Cc: gregkh@linuxfoundation.org, arnd@arndb.de, dan.carpenter@oracle.com, phil@raspberrypi.com, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org References: From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= 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Gecko/20100101 Thunderbird/68.10.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Provags-ID: V03:K1:GrAWME5fqWx84Fo7EV0UdeOMu/kwpUb6aK10lfrRKf/5PQIOf1a ZND1uKQSqolwdrUUX2O8fwWxssQ+yyalnVwECqMpn706TGm/bKmFCihdn0m5Jph8vt7OYJF CBd2agghAHOG6JOaxJTKTA8vaW6GINbSXCjMHvw651o7MybaaTN3vWxDexzPvv5793DlD2u dwYjtWlRFd3IvTwyvNTkA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:mTbicW4lBrM=:tNsWxgL0M6NHKgolW3DY4A O1mvqQGCWPscAy7UqSuaGn4TJONPEUa95XeKNTKBdB6SAU7/gcykqqXb847OzWaVpVMoN3KuJ ZbKaFPtU+ghi0Bko4k5G1s3PC4GOn++e9aXawjuWVlXqvnTVKTwNKPYzeMonvhOXWwhTsWJSL EW7tAMJfBlRPq/IGTO33L+FF81CsihjAengxTPCYqukdelLkhGCQckZus1QwbMlm0wN5sqLVd RVRbAMZbBDW4ZZ70i6TpuFIPt3rzMzjgZNnwJ+4L46Itm7nnVQMj6zYKN/9JS89M4ftQw2r1d jlrOC/TiBY1PDduG0z2+kSXeU4cZFmUBekMlYnkusuwzwnDa+ZgFZ5kQHSeA9NcdD9gALS+IV 3Qm7hdaBgeHM3T7//qszdcXXWhThqN9mJHt7lrpQPRvfDlss9khLxP35JYOjynHV8YhuzNNPC ++ZV45uE4+yUe4pJKWTE4twpgJh8L5sr9WThtbi5Ws2kgSAEi89PdeAPd//23JE8q+e4/DknS 7NhtMnA8FPdn+O7ou/ReneeGUDv8I3Y3qxdYAChEAWRQK2pcDvEHUbjFXQFwN52h7QBXKffHk Oh2zxLOu41xtf2iAF+7luSQiLgkeochjDZps1OVhO/9qhyP7DiDBn8Fb33EH93mmLR3bBgiNU h8F+/T0ZIjRL5+SDMoqph7c3DXMN3SLh+hkkQS3YKVsZDjeyYzxm6vE0A63vq7wjsI4hw0lhk 6R9v0+irMgQukBc1oQ+NYZ8fnBx2MEjyCRD8RA/3uFqt3f+SGaL0g4486cjLfI9JfAuvdxHaR dDFI2BJ4bS69bfj1ArzxY9xXQQXE9xC7hMx8cmGm4sSCqMmlmFiJsvOUuOfY66PTFdAyVs0RX Mp/yU7NelXJmOi4mbUjw== Hi Ojaswin, Am 04.07.21 um 17:56 schrieb Ojaswin Mujoo: > Hello, > > This patchset adderesses the TODO item number 10 specified at: > > drivers/staging/vc04-services/interface/TODO > > For reference, the task is: > > 10) Reorganize file structure: Move char driver to it's own file an= d join > both platform files > > The cdev is defined alongside with the platform code in vchiq_arm.c= =2E It > would be nice to completely decouple it from the actual core code. = For > instance to be able to use bcm2835-audio without having /dev/vchiq = created. > One could argue it's better for security reasons or general cleanli= ness. It > could even be interesting to create two different kernel modules, s= omething > the likes of vchiq-core.ko and vchiq-dev.ko. This would also ease t= he > upstreaming process. > > A summary of the patches is as follows: > > - Patch 1: Move cdev init code into a function > - Patch 2: Shift some devlarations from vchiq_arm.c to vchiq_arm.h for > sharing > - Patch 3: Move vchiq cdev init code from vchiq_arm.c into vchiq_dev.c > - Patch 4: Decouple cdev code by defining a Kconfig entry to allow > optional compilation of it. > - Patch 5: Merge code in vchiq_2835_arm.c to vchiq_arm.c > > (More details can be found in the commit messages) > > Changes since v2 [1]: > > * In Patch 1, as suggested, I have added error handling code back to > ensure the driver exits when there is an error in creating vchiq cdev= > =20 > * I have built this patch against the right kernel (gregkh/staging, > staging-next branch) to avoid introducing any unwanted inconsistencie= s > like whitespace changes > > I have tested the patch using vchiq_test utility on RPi 3B+. > > Additionally, I had a small question regarding the next steps here > (quoting my cover letter from v2): > > This question is more related to the next set of patches I'm > planning to submit. So the last thing left in this TODO is to > completely decouple vchiq platform and cdev code into 2 separate > modules and I am planning to do that in a different patchset.=20 > > The approach I have in mind is to start by using EXPORT_SYMBOL to > export all the functions (and accessor functions for variables like > g_state) that would be required for cdev init. Majority of these > would be exported from vchiq_arm.c and vchiq_core.c, and will then be > used in vchiq-dev.ko. Is this the right way to approach this?=20 i'm back from vacation and had some time for review. IMHO the patch series is fine (except some nits in patch 5) regarding the task in the TODO list. Making cdev a separate module is a cool idea, but it's not really necessary for moving this driver out of staging. There are more important things to do. Thank you Regards Stefan > > Thank you in advance for the help. Please let me know if any changes/ > additional info is required. > > Regards, > Ojaswin > > [1] v2: https://lkml.org/lkml/2021/6/20/63 > > Ojaswin Mujoo (5): > staging: vchiq: Refactor vchiq cdev code > staging: vchiq: Move certain declarations to vchiq_arm.h > staging: vchiq: Move vchiq char driver to its own file > staging: vchiq: Make creation of vchiq cdev optional > staging: vchiq: Combine vchiq platform code into single file > > drivers/staging/vc04_services/Kconfig | 10 + > drivers/staging/vc04_services/Makefile | 5 +- > .../interface/vchiq_arm/vchiq_2835_arm.c | 564 ---- > .../interface/vchiq_arm/vchiq_arm.c | 2344 +++++------------= > .../interface/vchiq_arm/vchiq_arm.h | 82 + > .../interface/vchiq_arm/vchiq_dev.c | 1440 ++++++++++ > 6 files changed, 2265 insertions(+), 2180 deletions(-) > delete mode 100644 drivers/staging/vc04_services/interface/vchiq_arm/v= chiq_2835_arm.c > create mode 100644 drivers/staging/vc04_services/interface/vchiq_arm/v= chiq_dev.c >