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2021 00:06:14 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Provags-ID: V03:K1:BRXG/GqK/eoiEeydPPkhZm4IaZ70DVtRZFB/d54YnB5JeidtjBk bORTtDi9ZlmucFW8578RMnV1RSOV9z1d618VN0bftXWFpxW6LwvX7Aqx3zE2HXkeynZhKyI AoLf31bWS38W1F25Sbl2xbHIl4OuQgcraC9J13np9SKEh8QJaub3i/Jk1bauzmOzLmPFiy3 mT9TSdaFxmekS8Syzo6WA== X-UI-Out-Filterresults: notjunk:1;V03:K0:ZSQfHOUokIw=:bf3OXrqU+18AswbaxmClKo 0/XzexXiUUVLymQKg3zPbiQwPaJSp0nnwseebZ7C4QCQCwgp3YvFsfVQzEP6bj6y+VUT2ElQB i82bDphx+bbMsjUAS8f/OaOi3Pi5tmA1SNIh8IUHhjKL3IohtHOZWhlFMxMy8Lauen2uFQMOE S2RIz2bbtyB8jvGCuGi5zkGD+M/L5w8udUtEXcztseFTf76zObWD9R0lAoWE5L/TeIWe8f+yF V+oyYgA/+EbpIMaCbN6bXF2nZ7ICajizOObA1C1ptbtF9lz8xqqFfa+y3thwyOOA3B3f7L+eF 24g62Sn85old19Xr023gKHdECOyTxtkuvWQpVD6AgioJ112dAqH0pm3yaGLPyu3xH6933FJiP 2fK/e+wWX4LZqZQJ6AgwwLfUxBpdXahAz6mF+2s7XgmKM69rVVKmjAUabtc7h38rQ1HX7UBy7 wCigI7Uh4uwst9rBzrxZTXgdEcxXdqiac3+4WQfszf1SeFTbKCd9Mmi6kaN5twQaK0cikID8b mf/4YjlJRlc6qNQlmSeOqg= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210614_150634_143726_691A345B X-CRM114-Status: GOOD ( 36.47 ) 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; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Am 14.06.21 um 21:32 schrieb Ojaswin Mujoo: > Greetings, > > I'm working on addressing item 10 of the following TODO list: > > drivers/staging/vc04-services/interface/TODO > > For reference, the task is: > > 10) Reorganize file structure: Move char driver to it's own file and join > both platform files > > The cdev is defined alongside with the platform code in vchiq_arm.c. 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 cleanliness. It > could even be interesting to create two different kernel modules, something > the likes of vchiq-core.ko and vchiq-dev.ko. This would also ease the > upstreaming process. > > > This patch is the first step towards decoupling the platform and the cdev code. > It moves all the cdev related code from vchiq_arm.c to vchiq_dev.c. However, for > now, I have aimed to keep the functionality untouched, hence the platform code > still calls the cdev initialisation function, and isn't truly decoupled yet. > > The summary of the changes is as follows: > > > * Definition of functions and variables shared by cdev and platform > code are moved to vchiq_arm.h while declaration stays in vchiq_arm.c > > * Declaration and definition of functions and variables only used by > cdev code are moved to vchiq_dev.c file. > > * Defined vchiq_deregister_chrdev() and vchiq_register_chrdev(..) in > vchiq_dev.c which handle cdev creation and deletion. They are called by the > platfrom code during probe(). looks like this should be 3 separate patches. So you have the pure move at the end. > > > I mainly wanted to put this patch out to see if I have the right idea of the > task at hand and to ensure I'm heading into the right direction. I would love to > hear your thoughts and suggestions on this. Once I have some feedback on this, I > can accordingly work towards a newer version to completely decouple the code. > > Lastly, I had some questions related to the the task: > > 1. So regarding the following line in the TODO: > > "For instance to be able to use bcm2835-audio without having /dev/vchiq > created." > > I was wondering about the possible ways to achieve this. Specifically, I was > thinking of the following 2 ways: > > 1.1 Making a KConfig entry for Cdev creation, like CONFIG_VCHIQ_CDEV, and > then do something like: > > vchiq_probe(..) > { > /* platform init code */ > > #if defined(CONFIG_VCHIQ_CDEV) > > /* Call cdev register function */ > > #endif > } A common pattern is to keep the calls, but have "empty" definitions of the those functions in the header file in case CONFIG_VCHIQ_CDEV is not defined. > > 1.2 The second approach is creating an entirely separate module for the cdev, > as suggested in the TODO. > > So I'm just wondering what the right approach should be? > > 2. Second, I currently tested by installing my patches to a pi3 B+ and running > `cat /dev/vchiq` to compare the output with the original kernel. Also, to > see if the platform code works without the cdev code, I commented out the > call to vchiq_register_cdev() and made sure the platform device (and > children) was registered but the char device was not present. However, I'm > not sure if these tests are comprehensive enough. What would be the right way > to test my changes? Sounds okay, but a functional test is still necessary (tool is provided by Raspberry Pi OS): vchiq_test -f 10 vchiq_test -p 10 Regards Stefan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel