On 11.5.2016 05:53, Sreekanth Reddy wrote:
> On Tue, May 10, 2016 at 6:41 PM, Tomas Henzl <thenzl@xxxxxxxxxx> wrote:
>> On 6.5.2016 10:59, Chaitra P B wrote:
>>> Replaced mpt3sas_base_flush_reply_queues()with
>>> mpt3sas_base_sync_reply_irqs(),as mpt3sas_base_flush_reply_queues()
>>> skips over reply queues that are currently busy (i.e. being handled
>>> by interrupt processing in another core). If a reply queue is busy,
>>> then call to synchronize_irq()in mpt3sas_base_sync_reply_irqs()make
>>> sures the other core has finished flushing the queue and completed
>>> any calls to the mid-layer scsi_done() routine.
>>>
>>> Signed-off-by: Chaitra P B <chaitra.basappa@xxxxxxxxxxxx>
>>> ---
>>> drivers/scsi/mpt3sas/mpt3sas_base.c | 15 +++++++--------
>>> drivers/scsi/mpt3sas/mpt3sas_base.h | 3 ++-
>>> drivers/scsi/mpt3sas/mpt3sas_scsih.c | 4 +++-
>>> 3 files changed, 12 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
>>> index 4e9142f..fd9002d 100644
>>> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
>>> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
>>> @@ -1103,18 +1103,16 @@ _base_is_controller_msix_enabled(struct MPT3SAS_ADAPTER *ioc)
>>> }
>>>
>>> /**
>>> - * mpt3sas_base_flush_reply_queues - flushing the MSIX reply queues
>>> + * mpt3sas_base_sync_reply_irqs - flush pending MSIX interrupts
>>> * @ioc: per adapter object
>>> - * Context: ISR conext
>>> + * Context: non ISR conext
>>> *
>>> - * Called when a Task Management request has completed. We want
>>> - * to flush the other reply queues so all the outstanding IO has been
>>> - * completed back to OS before we process the TM completetion.
>>> + * Called when a Task Management request has completed.
>>> *
>>> * Return nothing.
>>> */
>>> void
>>> -mpt3sas_base_flush_reply_queues(struct MPT3SAS_ADAPTER *ioc)
>>> +mpt3sas_base_sync_reply_irqs(struct MPT3SAS_ADAPTER *ioc)
>>> {
>>> struct adapter_reply_queue *reply_q;
>>>
>>> @@ -1125,12 +1123,13 @@ mpt3sas_base_flush_reply_queues(struct MPT3SAS_ADAPTER *ioc)
>>> return;
>>>
>>> list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {
>>> - if (ioc->shost_recovery)
>>> + if (ioc->shost_recovery || ioc->remove_host ||
>>> + ioc->pci_error_recovery)
>> Hi Chaitra,
>> how is this change + (ioc->remove_host || ioc->pci_error_recovery)
>> related to the subject?
> [Sreekanth] These changes are actually not related to this subject, but these
> sanity checks were missing previously.
Please next time put in a separated patch.
>
>>> return;
>>> /* TMs are on msix_index == 0 */
>>> if (reply_q->msix_index == 0)
>>> continue;
>>> - _base_interrupt(reply_q->vector, (void *)reply_q);
>>> + synchronize_irq(reply_q->vector);
>>> }
>> One thing I don't understand - what if an interrupt comes after
>> the synchronize_irq has finished ?
> [Sreekanth] Tomas, we are calling this function
> 'mpt3sas_base_flush_reply_queues()'
> only after we got the reply for the TM. Also our firmware will send
> reply for the TM only after
> it sends reply for the all terminated IOs (due to this TM). So by this
> time firmware has already
> raised interrupts for all the terminated IOs before it raising
> interrupt for TM. So we won't get
> any interrupts (which we are interested) after synchronize_irq.
Thanks.
Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Tomas
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