linux-kernel - Re: [PATCH v10 08/26] gunyah: rsc_mgr: Add resource manager RPC core

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Date:   Tue, 28 Feb 2023 14:49:50 -0800
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Alex Elder <alex.elder@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Alex Elder <elder@...aro.org>,
        "Prakruthi Deepak Heragu" <quic_pheragu@...cinc.com>
CC:     Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v10 08/26] gunyah: rsc_mgr: Add resource manager RPC core



On 2/27/2023 4:52 PM, Alex Elder wrote:
> On 2/23/23 5:13 PM, Elliot Berman wrote:
>>> TBH, gunyah.c should be merged as part of resource manager, and check 
>>> if uuids and features in probe before proceeding further.
>>>
>>
>>
>> Ah -- gunyah_rsc_mgr.ko has symbol dependency on gunyah-msgq.ko. 
>> gunyah-msgq.ko has symbol dependency on gunyah.ko. gunyah.ko doesn't 
>> have any probe and does all its work on module_init.
>>
>> In order to merge gunyah.c with resource manager, I would need to 
>> incorporate message queue mailbox into resource manager. IMO, this 
>> rapidly moves towards a mega-module which was discouraged previously.
> 
> I missed this discussion; why was it discouraged?
> 
> I can think of some reasons why I guess.  But I don't see what
> problem comes from linking together a "mega module" that's made
> up of well-isolated source files that expose minimal APIs to
> one another.  All inter-dependent modules will required at once
> anyway; I don't understand the benefit of implementing them
> separately.  Can you explain, or provide some context?  Thanks.

I came from some earlier comments from Dmitry:

https://lore.kernel.org/all/250945d2-3940-9830-63e5-beec5f44010b@linaro.org/

Earlier comments from Dmitry were about having bus and drivers in same 
module. I think same comment applies with mailbox built into the 
gunyah.ko (message queue is the provider and rsr_mgr is the consumer).

Thanks,
Elliot