linux-kernel - Re: [PATCH v5 09/17] pstore/ram: Use dynamic ramoops reserve resource

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Message-ID: <20425ace-3ef5-4eaf-8319-999bafa34a07@quicinc.com>
Date:   Mon, 11 Sep 2023 11:03:19 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
CC:     <corbet@....net>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
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Subject: Re: [PATCH v5 09/17] pstore/ram: Use dynamic ramoops reserve resource

On Sun, Sep 10, 2023 at 01:46:10AM +0530, Mukesh Ojha wrote:
> As dynamic ramoops command line parsing is now added, so
> lets add the support in ramoops driver to get the resource
> structure and add it during platform device registration.
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> ---
>  fs/pstore/ram.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 

Documentation/admin-guide/ramoops.rst might need an update as well.

> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index 2f625e1fa8d8..e73fbbc1b5b5 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> @@ -913,13 +913,17 @@ static void __init ramoops_register_dummy(void)
>  
>  	/*
>  	 * Prepare a dummy platform data structure to carry the module
> -	 * parameters. If mem_size isn't set, then there are no module
> -	 * parameters, and we can skip this.
> +	 * parameters. If mem_size isn't set, check for dynamic ramoops
> +	 * size and extract the information if it is set.
>  	 */
> -	if (!mem_size)
> +	if (!mem_size && !dyn_ramoops_res.end)
>  		return;
>  
>  	pr_info("using module parameters\n");
> +	if (dyn_ramoops_res.end) {
> +		mem_size = resource_size(&dyn_ramoops_res);
> +		mem_address = dyn_ramoops_res.start;
> +	}
>  
>  	memset(&pdata, 0, sizeof(pdata));
>  	pdata.mem_size = mem_size;

You might want to add "arch_" prefix to dyn_ramoops resource so that it
would be clear that it is coming from arch code. This code needs to
guard against arch not supplying this.

Thanks,
Pavan