> On Oct 28, 2015, at 5:06 PM, Don Brace <don.br...@pmcs.com> wrote:
>
> From: Scott Teel <scott.t...@pmcs.com>
>
> There are problems with getting configuration change notification
> in pass-through RAID environments. So, activate flag
> h->discovery_polling when one of these devices is detected in
> update_scsi_devices.
>
> After discovery_polling is set, execute a report luns from
> rescan_controller_worker (every 30 seconds).
>
> If the data from report_luns is different than last
> time (binary compare), execute a full rescan via update_scsi_devices.
>
> Reviewed-by: Scott Teel <scott.t...@pmcs.com>
> Reviewed-by: Justin Lindley <justin.lind...@pmcs.com>
> Reviewed-by: Kevin Barnett <kevin.barn...@pmcs.com>
> Signed-off-by: Don Brace <don.br...@pmcs.com>
> ---
> drivers/scsi/hpsa.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/hpsa.h | 2 ++
> 2 files changed, 70 insertions(+)
>
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 8d67648..e521acd 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -276,6 +276,7 @@ static int hpsa_scsi_ioaccel_queue_command(struct
> ctlr_info *h,
> static void hpsa_command_resubmit_worker(struct work_struct *work);
> static u32 lockup_detected(struct ctlr_info *h);
> static int detect_controller_lockup(struct ctlr_info *h);
> +static int hpsa_luns_changed(struct ctlr_info *h);
>
> static inline struct ctlr_info *sdev_to_hba(struct scsi_device *sdev)
> {
> @@ -3904,6 +3905,18 @@ static void hpsa_update_scsi_devices(struct ctlr_info
> *h, int hostno)
> hpsa_update_device_supports_aborts(h, tmpdevice, lunaddrbytes);
> this_device = currentsd[ncurrent];
>
> + /* Turn on discovery_polling if there are ext target devices.
> + * Event-based change notification is unreliable for those.
> + */
> + if (!h->discovery_polling) {
> + if (tmpdevice->external) {
> + h->discovery_polling = 1;
> + dev_info(&h->pdev->dev,
> + "External target, activate discovery
> polling.\n");
> + }
> + }
> +
> +
> *this_device = *tmpdevice;
> this_device->physical_device = physical_device;
>
> @@ -8022,6 +8035,41 @@ static int hpsa_offline_devices_ready(struct ctlr_info
> *h)
> return 0;
> }
>
> +static int hpsa_luns_changed(struct ctlr_info *h)
> +{
> + int rc = 1; /* assume there are changes */
> + struct ReportLUNdata *logdev = NULL;
> +
> + /* if we can't find out if lun data has changed,
> + * assume that it has.
> + */
> +
> + if (!h->lastlogicals)
> + goto out;
> +
> + logdev = kzalloc(sizeof(*logdev), GFP_KERNEL);
> + if (!logdev) {
> + dev_warn(&h->pdev->dev,
> + "Out of memory, can't track lun changes.\n");
> + goto out;
> + }
> + if (hpsa_scsi_do_report_luns(h, 1, logdev, sizeof(*logdev), 0)) {
> + dev_warn(&h->pdev->dev,
> + "report luns failed, can't track lun changes.\n");
> + goto out;
> + }
> + if (memcmp(logdev, h->lastlogicals, sizeof(*logdev))) {
> + dev_info(&h->pdev->dev,
> + "Lun changes detected.\n");
> + memcpy(h->lastlogicals, logdev, sizeof(*logdev));
> + goto out;
> + } else
> + rc = 0; /* no changes detected. */
> +out:
> + kfree(logdev);
> + return rc;
> +}
> +
> static void hpsa_rescan_ctlr_worker(struct work_struct *work)
> {
> unsigned long flags;
> @@ -8037,6 +8085,18 @@ static void hpsa_rescan_ctlr_worker(struct work_struct
> *work)
> hpsa_ack_ctlr_events(h);
> hpsa_scan_start(h->scsi_host);
> scsi_host_put(h->scsi_host);
> + } else if (h->discovery_polling) {
> + if (hpsa_luns_changed(h)) {
> + struct Scsi_Host *sh = NULL;
> +
> + dev_info(&h->pdev->dev,
> + "driver discovery polling rescan.\n");
> + sh = scsi_host_get(h->scsi_host);
> + if (sh != NULL) {
> + hpsa_scan_start(sh);
> + scsi_host_put(sh);
> + }
> + }
> }
> spin_lock_irqsave(&h->lock, flags);
> if (!h->remove_in_progress)
> @@ -8277,6 +8337,8 @@ reinit_after_soft_reset:
>
> /* Enable Accelerated IO path at driver layer */
> h->acciopath_status = 1;
> + /* Disable discovery polling.*/
> + h->discovery_polling = 0;
>
>
> /* Turn the interrupts on so we can service requests */
> @@ -8284,6 +8346,11 @@ reinit_after_soft_reset:
>
> hpsa_hba_inquiry(h);
>
> + h->lastlogicals = kzalloc(sizeof(*(h->lastlogicals)), GFP_KERNEL);
> + if (!h->lastlogicals)
> + dev_info(&h->pdev->dev,
> + "Can't track change to report lun data\n");
> +
> /* Monitor the controller for firmware lockups */
> h->heartbeat_sample_interval = HEARTBEAT_SAMPLE_INTERVAL;
> INIT_DELAYED_WORK(&h->monitor_ctlr_work, hpsa_monitor_ctlr_worker);
> @@ -8368,6 +8435,7 @@ static void hpsa_shutdown(struct pci_dev *pdev)
> hpsa_flush_cache(h);
> h->access.set_intr_mask(h, HPSA_INTR_OFF);
> hpsa_free_irqs(h); /* init_one 4 */
> + kfree(h->lastlogicals);
Is this the best place to free this memory? If your rescan worker is running
concurrently you might run into trouble.
> hpsa_disable_interrupt_mode(h); /* pci_init 2 */
> }
>
> diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
> index 0cf147b..6c82d3c 100644
> --- a/drivers/scsi/hpsa.h
> +++ b/drivers/scsi/hpsa.h
> @@ -262,6 +262,8 @@ struct ctlr_info {
> int acciopath_status;
> int drv_req_rescan;
> int raid_offload_debug;
> + int discovery_polling;
> + struct ReportLUNdata *lastlogicals;
> int needs_abort_tags_swizzled;
> struct workqueue_struct *resubmit_wq;
> struct workqueue_struct *rescan_ctlr_wq;
>
> --
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