linux-kernel - Re: How to pass software configuration to driver built as module in boot up phase

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Message-ID: <5266fe30-849d-4c84-ac5e-7b456ea15929@quicinc.com>
Date:   Tue, 31 Oct 2023 11:00:06 +0800
From:   Tingwei Zhang <quic_tingweiz@...cinc.com>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Jinlong Mao <quic_jinlmao@...cinc.com>
Subject: Re: How to pass software configuration to driver built as module in
 boot up phase

On 10/31/2023 7:35 AM, Masami Hiramatsu (Google) wrote:
> On Mon, 30 Oct 2023 19:21:48 +0800
> Tingwei Zhang <quic_tingweiz@...cinc.com> wrote:
> 
>> Hi Masami, Greg and Rafael,
>>
>> I have one driver that needs a bunch to software configuration like 1000
>> settings. These settings can be different according to the use case.
> 
> Is it an out-of-tree driver which can not be embedded?
Current it's out-of-tree and we are trying to get it accepted.
> 
>>
>> They are required in boot up phase so we can't reply on user space to
>> make the configuration.
>>
>> Boot config is not preferred since we'd like to build that driver as
>> dynamic load Kernel module.
>>
>> Could you let me know if there's any mechanism in Kernel to do that?
> 
> Hm, it is interesting situation. So I made the bootconfig API and data
> released after boot (only keep it in /proc/bootconfig). So I thought
> module loader script can parse it and pass params to the modules.
If we use bootconfig API in driver, it can't be built as module. 
Compilation won't pass.
> But I did not expected that the number of params is about 1000.
> 
> Thank you,
> 

-- 
Thanks,
Tingwei