From: Quinn Tran qutran@marvell.com
commit 713b415726f100f6644971e75ebfe1edbef1a390 upstream.
For session recovery, driver relies on the dpc thread to initiate certain operations. The dpc thread runs exclusively without the Mailbox interface being occupied. A recent code change for heartbeat check via mailbox cmd 0 is preventing the dpc thread from carrying out its operation. This patch allows the higher priority error recovery to run first before running the lower priority heartbeat check.
Link: https://lore.kernel.org/r/20220310092604.22950-9-njavali@marvell.com Fixes: d94d8158e184 ("scsi: qla2xxx: Add heartbeat check") Cc: stable@vger.kernel.org Reviewed-by: Himanshu Madhani himanshu.madhani@oracle.com Signed-off-by: Quinn Tran qutran@marvell.com Signed-off-by: Nilesh Javali njavali@marvell.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/qla2xxx/qla_def.h | 1 + drivers/scsi/qla2xxx/qla_os.c | 20 +++++++++++++++++--- 2 files changed, 18 insertions(+), 3 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -4621,6 +4621,7 @@ struct qla_hw_data { struct workqueue_struct *wq; struct work_struct heartbeat_work; struct qlfc_fw fw_buf; + unsigned long last_heartbeat_run_jiffies;
/* FCP_CMND priority support */ struct qla_fcp_prio_cfg *fcp_prio_cfg; --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -7209,7 +7209,7 @@ skip: return do_heartbeat; }
-static void qla_heart_beat(struct scsi_qla_host *vha) +static void qla_heart_beat(struct scsi_qla_host *vha, u16 dpc_started) { struct qla_hw_data *ha = vha->hw;
@@ -7219,8 +7219,19 @@ static void qla_heart_beat(struct scsi_q if (vha->hw->flags.eeh_busy || qla2x00_chip_is_down(vha)) return;
- if (qla_do_heartbeat(vha)) + /* + * dpc thread cannot run if heartbeat is running at the same time. + * We also do not want to starve heartbeat task. Therefore, do + * heartbeat task at least once every 5 seconds. + */ + if (dpc_started && + time_before(jiffies, ha->last_heartbeat_run_jiffies + 5 * HZ)) + return; + + if (qla_do_heartbeat(vha)) { + ha->last_heartbeat_run_jiffies = jiffies; queue_work(ha->wq, &ha->heartbeat_work); + } }
/************************************************************************** @@ -7411,6 +7422,8 @@ qla2x00_timer(struct timer_list *t) start_dpc++; }
+ /* borrowing w to signify dpc will run */ + w = 0; /* Schedule the DPC routine if needed */ if ((test_bit(ISP_ABORT_NEEDED, &vha->dpc_flags) || test_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags) || @@ -7443,9 +7456,10 @@ qla2x00_timer(struct timer_list *t) test_bit(RELOGIN_NEEDED, &vha->dpc_flags), test_bit(PROCESS_PUREX_IOCB, &vha->dpc_flags)); qla2xxx_wake_dpc(vha); + w = 1; }
- qla_heart_beat(vha); + qla_heart_beat(vha, w);
qla2x00_restart_timer(vha, WATCH_INTERVAL); }