diff options
| author | Vikas Chaudhary <vikas.chaudhary@qlogic.com> | 2013-12-16 15:49:45 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2014-03-15 21:19:14 +0400 |
| commit | 4ebbb5cf640c5240cafde732c56fe24a5514bf8d (patch) | |
| tree | 9a588617ff7978c2ded8e777feb85c4cd6d473c5 /drivers/scsi/qla4xxx | |
| parent | 58e2bbe9851668a031afc678433040f6eaea4cb3 (diff) | |
| download | linux-4ebbb5cf640c5240cafde732c56fe24a5514bf8d.tar.xz | |
[SCSI] qla4xxx: Reduce rom-lock contention during reset recovery.
Issue:
Driver holds rom-lock for too long during reset recovery.
During adapter reset testing, it was found that the driver
holds the rom-lock for too long, because of which other
drivers fail to acquire the rom-lock, leading to reset
failures.
The primary cause is, in the bootstrap code, while
holding the rom-lock, the driver checks if the peg is
halted, causing a 2 second contention.
Fix:
When a reset recovery starts, the driver deduces the cause, and
sets appropriate flags in watchdog & recover_adapter routines.
This flag should be used to determine if bootstrap is invoked
from probe or reset context, reducing the rom-lock footprint of
the drivers.
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/qla4xxx')
| -rw-r--r-- | drivers/scsi/qla4xxx/ql4_nx.c | 33 |
1 files changed, 12 insertions, 21 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c index d2040b49120a..63328c812b70 100644 --- a/drivers/scsi/qla4xxx/ql4_nx.c +++ b/drivers/scsi/qla4xxx/ql4_nx.c @@ -2828,37 +2828,28 @@ int qla4_8xxx_device_bootstrap(struct scsi_qla_host *ha) int rval = QLA_ERROR; int i; uint32_t old_count, count; - int need_reset = 0, peg_stuck = 1; + int need_reset = 0; need_reset = ha->isp_ops->need_reset(ha); - old_count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER); - - for (i = 0; i < 10; i++) { - msleep(200); - count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER); - if (count != old_count) - peg_stuck = 0; - } if (need_reset) { /* We are trying to perform a recovery here. */ - if (peg_stuck) + if (test_bit(AF_FW_RECOVERY, &ha->flags)) ha->isp_ops->rom_lock_recovery(ha); - goto dev_initialize; } else { - /* Start of day for this ha context. */ - if (peg_stuck) { - /* Either we are the first or recovery in progress. */ - ha->isp_ops->rom_lock_recovery(ha); - goto dev_initialize; - } else { - /* Firmware already running. */ - rval = QLA_SUCCESS; - goto dev_ready; + old_count = qla4_8xxx_rd_direct(ha, QLA8XXX_PEG_ALIVE_COUNTER); + for (i = 0; i < 10; i++) { + msleep(200); + count = qla4_8xxx_rd_direct(ha, + QLA8XXX_PEG_ALIVE_COUNTER); + if (count != old_count) { + rval = QLA_SUCCESS; + goto dev_ready; + } } + ha->isp_ops->rom_lock_recovery(ha); } -dev_initialize: /* set to DEV_INITIALIZING */ ql4_printk(KERN_INFO, ha, "HW State: INITIALIZING\n"); qla4_8xxx_wr_direct(ha, QLA8XXX_CRB_DEV_STATE, |