From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.13]) (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 27AF172 for ; Sun, 20 Jun 2021 13:34:35 +0000 (UTC) Received: from [192.168.1.107] ([37.4.249.157]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MA7Om-1m137H49TW-00Bbkk; Sun, 20 Jun 2021 15:28:46 +0200 Subject: Re: [PATCH v2 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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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:K1:6QQvsEy6On9Pi1VUBAxwves/APp0CRttuN83PHpbfIQTuOmCxip GrHD6YYBZHgjVdNjwPKcP2ZQVuGjHiNhSfrd6N39RXpLKws3QmKWt9FNNzyx8GrVteV8ecz rc0zUkf28CrqCYFyR6fM9TJJSNi0CvJ+84hJsyyzrjjZFcQVbKZZ2sM9OXVD5s4rjQMoEQU ElZ0W2v1Q2m3fVzchHEUQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:ssXJtmy5hm8=:60rsy+7WAM6HprzUHUeBEU Nvru6VhS1M7rWa47uZJQRrjZGrUlRy+4j4Y9TsWzOebiEjXmOnpFUbeeZ6ZzjuBtwoFB7H5Sd rVaXRzlZioPAZezrIR9AWFuEHF6WwlakWstjF/Axt79Ik1rmIFCUMRDhEfjCF2UO2DsovP63L BMzPpgdIa7FLIkN0FxWA+DZbICVR3svcdoXJXkkneaMm66KBp9kvTdR6v42mZ7lsLES0H5EGN ryGI6dzuan3tnOT3oYf57vX2kh98qvPPXeSAU1/tkvbzYdiyGDEJytvbjeUuRlfxqdRdoIICk qOmtZY9ADXb/ZAHcs6bSqqqougKkPs42kaQYXmDIhwD/Cz/GAcT0UgtEj7E8n0YW5+I3f/G4a oXYKSpaMh2A7VH7N4NDF/u7XrffWlWe2IVdKHnrPQG8EykKHepEOMzwvdGxAG+MmyR983xuDE LnqktGjIUoXi2Fr9PmAtDgFmtHGuR6/0YbFcYWQYzVzrZ5wYwSlH900C4x5pHtTGmBZS5K+/P 0gwLIxdnhvIjChtkifHQlQ= Hi Ojaswin, Am 20.06.21 um 14:55 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. > > As Stefan suggested in the last revision, I have split the commits into= > more finer parts for ease of readability and maintainability. I have > also added 2 more patches to define a KConfig entry for vchiq cdev, and= > to merge the code in vchiq_2835_arm.c to vchiq_arm.c > > A summary of the patches is now 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) > > > NOTE: This patchset is built against the raspberry pi mainline kernel = at > https://github.com/raspberrypi/linux/blob/rpi-5.10.y, and has been > tested on Raspberry Pi 3B+ please don't do this, because it's a waste of time. Greg can only apply patches against the mainline kernel and the patches must be tested with the mainline kernel. Additionally i've sent a lot of patches recently which are not applied against the vendor tree. > > At this point, I have some questions and ideas and would like to hear y= our > thoughts and suggestions on them: > > 1. So as mentioned, I have built this against the raspberry pi kernel, > since I was not able to figure out a way to build the vanilla > mainline kernel for Raspberry Pi. However, I understand that since > this will be applied to the mainline, I need to make sure it is > consistent with it. =20 Can you please describe the issue in detail? Or try this older guide [1] Best regards Stefan Wahren [1] - https://gist.github.com/lategoodbye/c7317a42bf7f9c07f5a91baed8c68f7= 5 > > Hence to confirm that, I tried to "git am" this patchset to the > mainline kernel but there are some merge conflicts in doing so. I > have an idea how to resolve most of them except the following: > > - The mainline vchiq_arm.c differs from the one in rapberry pi > mainline which caused conflict in Patch 3. > > I'm not sure which vchiq_arm.c to treat as the base for my patches. > The one in mainline? or the one in raspberry pi's git tree? > > > 2. 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 b= e > used in vchiq-dev.ko. Is this the right way to approach this?=20 > > Thank you in advance for looking into this and best regards! > Ojaswin > > > 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 > > arch/arm/configs/bcm2709_defconfig | 1 + > arch/arm/configs/bcm2711_defconfig | 1 + > arch/arm/configs/bcmrpi_defconfig | 1 + > drivers/staging/vc04_services/Kconfig | 10 + > drivers/staging/vc04_services/Makefile | 5 +- > .../interface/vchiq_arm/vchiq_2835_arm.c | 651 ----- > .../interface/vchiq_arm/vchiq_arm.c | 2477 ++++++-----------= > .../interface/vchiq_arm/vchiq_arm.h | 79 + > .../interface/vchiq_arm/vchiq_dev.c | 1488 ++++++++++ > 9 files changed, 2402 insertions(+), 2311 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 >