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scsi: mpt3sas: Fix for Crusader to achieve product targets with SAS devices.

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Small glitch/degraded performance in Crusader is improved with SAS
drives by removing unnecessary spinlocks while clearing scsi command in
drivers internal lookup table.

Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chaitra P B
2017-01-23 15:26:08 +05:30
committed by Martin K. Petersen
parent 6c44c0fe91
commit 459325c466
4 changed files with 33 additions and 4 deletions
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31
drivers/scsi/mpt3sas/mpt3sas_scsih.c
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@@ -1073,6 +1073,26 @@ _scsih_scsi_lookup_get(struct MPT3SAS_ADAPTER *ioc, u16 smid)
return ioc->scsi_lookup[smid - 1].scmd;
}
/**
* __scsih_scsi_lookup_get_clear - returns scmd entry without
* holding any lock.
* @ioc: per adapter object
* @smid: system request message index
*
* Returns the smid stored scmd pointer.
* Then will dereference the stored scmd pointer.
*/
static inline struct scsi_cmnd *
__scsih_scsi_lookup_get_clear(struct MPT3SAS_ADAPTER *ioc,
u16 smid)
{
struct scsi_cmnd *scmd = NULL;
swap(scmd, ioc->scsi_lookup[smid - 1].scmd);
return scmd;
}
/**
* _scsih_scsi_lookup_get_clear - returns scmd entry
* @ioc: per adapter object
@@ -1088,8 +1108,7 @@ _scsih_scsi_lookup_get_clear(struct MPT3SAS_ADAPTER *ioc, u16 smid)
struct scsi_cmnd *scmd;
spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
scmd = ioc->scsi_lookup[smid - 1].scmd;
ioc->scsi_lookup[smid - 1].scmd = NULL;
scmd = __scsih_scsi_lookup_get_clear(ioc, smid);
spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
return scmd;
@@ -4646,7 +4665,13 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
unsigned long flags;
mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
scmd = _scsih_scsi_lookup_get_clear(ioc, smid);
if (ioc->broadcast_aen_busy || ioc->pci_error_recovery ||
ioc->got_task_abort_from_ioctl)
scmd = _scsih_scsi_lookup_get_clear(ioc, smid);
else
scmd = __scsih_scsi_lookup_get_clear(ioc, smid);
if (scmd == NULL)
return 1;