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

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Date:   Thu, 23 Feb 2023 15:13:20 -0800
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     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 2/23/2023 2:29 AM, Srinivas Kandagatla wrote:
> 
> 
> On 22/02/2023 23:18, Elliot Berman wrote:
>>>>
>>>> +EXPORT_SYMBOL_GPL(gh_rm_notifier_unregister);
>>>> +
>>>> +void get_gh_rm(struct gh_rm *rm)
>>>> +{
>>>> +    get_device(rm->dev);
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(get_gh_rm);
>>>
>>> Can we have some consistency in the exported symbol naming,
>>> we have two combinations now.
>>>
>>> EXPORT_SYMBOL_GPL(gh_rm_notifier_register);
>>> EXPORT_SYMBOL_GPL(get_gh_rm);
>>>
>>> lets stick to one.
>>
>> done.
>>
>>>> +
>>>> +void put_gh_rm(struct gh_rm *rm)
>>>> +{
>>>> +    put_device(rm->dev);
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(put_gh_rm);
>>>>
>>> ...
>>>
>>>> +
>>>> +static int gh_rm_drv_probe(struct platform_device *pdev)
>>>> +{
>>>> +    struct gh_msgq_tx_data *msg;
>>>> +    struct gh_rm *rm;
>>>> +    int ret;
>>>> +
>>> How are we ensuring that gunyah driver is probed before this driver?
>>>
>>>
>>
>> Which driver?
> 
> Am referring to gunyah.ko
> 
> 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.

Thanks,
Elliot