> On Oct 30, 2015, at 9:08 AM, Don Brace <brace77...@gmail.com> wrote:
>
> On 10/29/2015 03:59 PM, Matthew R. Ochs wrote:
>>> On Oct 29, 2015, at 3:51 PM, Don Brace <brace77...@gmail.com> wrote:
>>> On 10/29/2015 03:20 PM, Matthew R. Ochs wrote:
>>>>> 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.
>>>>
>>> Since hpsa_shutdown is called from hpsa_remove_one, at a point after
>>> cancel_delayed_work_sync(&h->rescan_ctlr_work) has already been called,
>>> I think that the rescan worker won’t be running at this point.
>> My concern wasn't about the remove path but rather the shutdown notification
>> path.
>> ]
> You are correct. I moved this to hpsa_remove_one.
With this change
Reviewed-by: Matthew R. Ochs <mro...@linux.vnet.ibm.com>
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