linux-kernel - Re: [PATCH 3/3] powerpc: Set crashkernel offset to mid of RMA region

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Date:   Mon, 4 Oct 2021 22:47:24 +0530
From:   Sourabh Jain <sourabhjain@...ux.ibm.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>, mpe@...erman.id.au
Cc:     hbathini@...ux.ibm.com, mahesh@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
        Abdul haleem <abdhalee@...ux.vnet.ibm.com>
Subject: Re: [PATCH 3/3] powerpc: Set crashkernel offset to mid of RMA region

Hello Aneesh,

@@ -1235,6 +1235,9 @@ int __init early_init_dt_scan_rtas(unsigned long 
node,
>>       entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
>>       sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);
>>   +    if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL))
>> +        powerpc_firmware_features |= FW_FEATURE_LPAR;
>> +
>
> The equivalent check that we currently do more than checking 
> ibm,hypertas-functions.
>
>     if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
>         prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
>                        &len);
>         if (prop) {
>             powerpc_firmware_features |= FW_FEATURE_LPAR;
>             fw_hypertas_feature_init(prop, len);
> }
>
If ibm,hypertas-functions prop has to be part of rtas or rtas@0 node to 
decide we are on LPAR then how about splitting the probe_fw_features 
functions into two functions, one to detect FW_FEATURE_LPAR and another 
function to do the rest?
>
> also do we expect other firmware features to be set along with 
> FW_FEATURE_LPAR?


No only FW_FEATURE_LPAR feature so that kernel can decide the 
crashkernel offset accordingly.


Thanks for the review.

- Sourabh Jain