On Sat, Dec 28, 2013 at 09:20:04AM +1100, Benjamin Herrenschmidt wrote:
>On Wed, 2013-12-25 at 16:58 +0800, Gavin Shan wrote:
>> After reset on the specific PE or PHB, we never configure AER
>> correctly on PowerNV platform. We needn't care it on pSeries
>> platform. The patch introduces additional EEH operation eeh_ops::
>> restore_bars() so that we have chance to configure AER correctly
>> for PowerNV platform.
>
>Why call it "restore_bars" if it restores something else (in this case
>AER) ?
>
>I would call it "restore_config" instead... Also rather than adding
>the knowledge of what AER bit works or not for the device, would it
>make sense to instead have a FW call to re-init the device ?
>
>Otherwise, you introduce duplication between Linux and Firmware with
>the risk of getting out of sync...
>
Thanks for your comments, Ben. It's reasonable to have name "restore_config"
and I'll introduce a FW call in next revision as you suggested :-)
Thanks,
Gavin
>> Signed-off-by: Gavin Shan <sha...@linux.vnet.ibm.com>
>> ---
>> arch/powerpc/include/asm/eeh.h | 1 +
>> arch/powerpc/kernel/eeh_pe.c | 3 +++
>> arch/powerpc/platforms/pseries/eeh_pseries.c | 4 +++-
>> 3 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
>> index d3e5e9b..4b709bf 100644
>> --- a/arch/powerpc/include/asm/eeh.h
>> +++ b/arch/powerpc/include/asm/eeh.h
>> @@ -157,6 +157,7 @@ struct eeh_ops {
>> int (*read_config)(struct device_node *dn, int where, int size, u32
>> *val);
>> int (*write_config)(struct device_node *dn, int where, int size, u32
>> val);
>> int (*next_error)(struct eeh_pe **pe);
>> + void (*restore_bars)(struct device_node *dn);
>> };
>>
>> extern struct eeh_ops *eeh_ops;
>> diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
>> index f945053..19eb95a 100644
>> --- a/arch/powerpc/kernel/eeh_pe.c
>> +++ b/arch/powerpc/kernel/eeh_pe.c
>> @@ -737,6 +737,9 @@ static void *eeh_restore_one_device_bars(void *data,
>> void *flag)
>> else
>> eeh_restore_device_bars(edev, dn);
>>
>> + if (eeh_ops->restore_bars)
>> + eeh_ops->restore_bars(dn);
>> +
>> return NULL;
>> }
>>
>> diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c
>> b/arch/powerpc/platforms/pseries/eeh_pseries.c
>> index ccb633e..623adaf 100644
>> --- a/arch/powerpc/platforms/pseries/eeh_pseries.c
>> +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
>> @@ -689,7 +689,9 @@ static struct eeh_ops pseries_eeh_ops = {
>> .get_log = pseries_eeh_get_log,
>> .configure_bridge = pseries_eeh_configure_bridge,
>> .read_config = pseries_eeh_read_config,
>> - .write_config = pseries_eeh_write_config
>> + .write_config = pseries_eeh_write_config,
>> + .next_error = NULL,
>> + .restore_bars = NULL
>> };
>>
>> /**
>
>
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