Re: [PATCH v3 5/5] powerpc/powernv/eeh: Map VFIO EEH error injection to OPAL

[Sourabh Jain <sourabhjain@linux.ibm.com>]

On 05/08/26 11:53, Narayana Murty N wrote:
> Hi Sourabh,
>
> On 05/08/26 12:01 AM, Sourabh Jain wrote:
>>
>>
>> As per the title this series is about RTAS-based error injection on 
>> pSeries.
>>
>> Then why do we have powernv/opal patch part of this series?
>>
>> - Sourabh Jain
>>
> The guest running on povernv host also a pseries guest. VFIO will take 
> care of
> translating the calls to respective platforms. So as a platform 
> comparability
> the changes are made in this series.

Oh, okay. These changes are for a pSeries guest running on a PowerNV 
platform.
Thanks for the clarification.

- Sourabh Jain

>
> Regards,
> Narayana.
>
>>
>> On 21/07/26 09:08, Narayana Murty N wrote:
>>> The EEH error-injection interface passes the generic userspace ABI
>>> values EEH_ERR_TYPE_32 and EEH_ERR_TYPE_64 to the platform backend.
>>>
>>> The PowerNV backend currently compares those generic values directly
>>> with OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR and
>>> OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR64. Although the corresponding values
>>> are currently numerically identical, this implicitly couples the
>>> generic EEH ABI to the OPAL firmware encoding.
>>>
>>> Explicitly translate the generic EEH error types to their OPAL
>>> equivalents in pnv_eeh_err_inject(). Keep the platform-specific
>>> encoding within the PowerNV backend and reject unsupported generic
>>> types with -EINVAL.
>>>
>>> No userspace ABI values are changed.
>>>
>>> Signed-off-by: Narayana Murty N <nnmlinux@linux.ibm.com>
>>> ---
>>>   arch/powerpc/platforms/powernv/eeh-powernv.c | 36 
>>> +++++++++++++++++---
>>>   1 file changed, 32 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c 
>>> b/arch/powerpc/platforms/powernv/eeh-powernv.c
>>> index db3370d1673c..b0bcd014a133 100644
>>> --- a/arch/powerpc/platforms/powernv/eeh-powernv.c
>>> +++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
>>> @@ -1169,11 +1169,39 @@ static int pnv_eeh_err_inject(struct eeh_pe 
>>> *pe, int type, int func,
>>>       struct pnv_phb *phb = hose->private_data;
>>>       s64 rc;
>>>   -    if (type != OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR &&
>>> -        type != OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR64) {
>>> -        pr_warn("%s: Invalid error type %d\n",
>>> +    /*
>>> +     * Map generic EEH error-type ABI values to OPAL-specific type 
>>> codes.
>>> +     * EEH_ERR_TYPE_32 and EEH_ERR_TYPE_64 are the only types 
>>> supported by
>>> +     * OPAL.  Additional generic types defined in the UAPI header 
>>> are valid
>>> +     * for pSeries RTAS but unsupported here; return -EOPNOTSUPP 
>>> for those.
>>> +     * Unknown or invalid values return -EINVAL.
>>> +     *
>>> +     * Note: currently OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR  == 0 ==
>>> +     * EEH_ERR_TYPE_32 and OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR64 == 1 ==
>>> +     * EEH_ERR_TYPE_64, but the explicit switch makes the coupling
>>> +     * visible and allows the values to diverge independently.
>>> +     */
>>> +    switch (type) {
>>> +    case EEH_ERR_TYPE_32:
>>> +        type = OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR;
>>> +        break;
>>> +    case EEH_ERR_TYPE_64:
>>> +        type = OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR64;
>>> +        break;
>>> +    case EEH_ERR_TYPE_RECOVERED_SPECIAL_EVENT:
>>> +    case EEH_ERR_TYPE_CORRUPTED_PAGE:
>>> +    case EEH_ERR_TYPE_CORRUPTED_DCACHE_START:
>>> +    case EEH_ERR_TYPE_CORRUPTED_DCACHE_END:
>>> +    case EEH_ERR_TYPE_CORRUPTED_ICACHE_START:
>>> +    case EEH_ERR_TYPE_CORRUPTED_ICACHE_END:
>>> +    case EEH_ERR_TYPE_CORRUPTED_TLB_START:
>>> +    case EEH_ERR_TYPE_CORRUPTED_TLB_END:
>>> +        pr_warn("%s: EEH error type %d not supported by OPAL\n",
>>>               __func__, type);
>>> -        return -ERANGE;
>>> +        return -EOPNOTSUPP;
>>> +    default:
>>> +        pr_warn("%s: unsupported EEH error type %d\n", __func__, 
>>> type);
>>> +        return -EINVAL;
>>>       }
>>>         if (func < OPAL_ERR_INJECT_FUNC_IOA_LD_MEM_ADDR ||
>>
>