On 28.10.2015 23:06, Don Brace wrote:
> From: Scott Teel <scott.t...@pmcs.com>
>
> When external target arrays are present, disable the firmware's
> normal behavior of returning a cached copy of the report lun data,
> and force it to collect new data each time we request a report luns.
>
> This is necessary for external arrays, since there may be no
> reliable signal from the external array to the smart array when
> lun configuration changes, and thus when driver requests
> report luns, it may be stale data.
>
> Use diag options to turn off RPL data caching.
>
> 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 | 86
> +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/hpsa_cmd.h | 3 ++
> 2 files changed, 89 insertions(+)
>
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index e521acd..33fd0aa 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 void hpsa_disable_rld_caching(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)
> @@ -6386,6 +6387,24 @@ static int fill_cmd(struct CommandList *c, u8 cmd,
> struct ctlr_info *h,
> c->Request.CDB[8] = (size >> 8) & 0xFF;
> c->Request.CDB[9] = size & 0xFF;
> break;
> + case BMIC_SENSE_DIAG_OPTIONS:
> + c->Request.CDBLen = 16;
> + c->Request.type_attr_dir =
> + TYPE_ATTR_DIR(cmd_type, ATTR_SIMPLE, XFER_READ);
> + c->Request.Timeout = 0;
> + /* Spec says this should be BMIC_WRITE */
> + c->Request.CDB[0] = BMIC_READ;
> + c->Request.CDB[6] = BMIC_SENSE_DIAG_OPTIONS;
> + break;
> + case BMIC_SET_DIAG_OPTIONS:
> + c->Request.CDBLen = 16;
> + c->Request.type_attr_dir =
> + TYPE_ATTR_DIR(cmd_type,
> + ATTR_SIMPLE, XFER_WRITE);
> + c->Request.Timeout = 0;
> + c->Request.CDB[0] = BMIC_WRITE;
> + c->Request.CDB[6] = BMIC_SET_DIAG_OPTIONS;
> + break;
> case HPSA_CACHE_FLUSH:
> c->Request.CDBLen = 12;
> c->Request.type_attr_dir =
> @@ -8086,6 +8105,7 @@ static void hpsa_rescan_ctlr_worker(struct work_struct
> *work)
> hpsa_scan_start(h->scsi_host);
> scsi_host_put(h->scsi_host);
> } else if (h->discovery_polling) {
> + hpsa_disable_rld_caching(h);
> if (hpsa_luns_changed(h)) {
> struct Scsi_Host *sh = NULL;
>
> @@ -8423,6 +8443,72 @@ out:
> kfree(flush_buf);
> }
>
> +/* Make controller gather fresh report lun data each time we
> + * send down a report luns request
> + */
> +static void hpsa_disable_rld_caching(struct ctlr_info *h)
> +{
> + u32 *options;
> + struct CommandList *c;
> + int rc;
> +
> + /* Don't bother trying to set diag options if locked up */
> + if (unlikely(h->lockup_detected))
> + return;
> +
> + options = kzalloc(sizeof(*options), GFP_KERNEL);
> + if (!options) {
> + dev_err(&h->pdev->dev,
> + "Error: failed to disable rld caching, during
> alloc.\n");
> + return;
> + }
> +
> + c = cmd_alloc(h);
> +
> + /* first, get the current diag options settings */
> + if (fill_cmd(c, BMIC_SENSE_DIAG_OPTIONS, h, options, 4, 0,
> + RAID_CTLR_LUNID, TYPE_CMD))
> + goto errout;
> +
> + rc = hpsa_scsi_do_simple_cmd_with_retry(h, c,
> + PCI_DMA_FROMDEVICE, NO_TIMEOUT);
> + if ((rc != 0) || (c->err_info->CommandStatus != 0))
> + goto errout;
> +
> + /* Now, set the bit for disabling the RLD caching */
> + *options |= HPSA_DIAG_OPTS_DISABLE_RLD_CACHING;
> +
> + if (fill_cmd(c, BMIC_SET_DIAG_OPTIONS, h, options, 4, 0,
> + RAID_CTLR_LUNID, TYPE_CMD))
> + goto errout;
> +
> + rc = hpsa_scsi_do_simple_cmd_with_retry(h, c,
> + PCI_DMA_TODEVICE, NO_TIMEOUT);
> + if ((rc != 0) || (c->err_info->CommandStatus != 0))
> + goto errout;
> +
> + /* Now verify that it got set: */
> + if (fill_cmd(c, BMIC_SENSE_DIAG_OPTIONS, h, options, 4, 0,
> + RAID_CTLR_LUNID, TYPE_CMD))
> + goto errout;
> +
> + rc = hpsa_scsi_do_simple_cmd_with_retry(h, c,
> + PCI_DMA_FROMDEVICE, NO_TIMEOUT);
> + if ((rc != 0) || (c->err_info->CommandStatus != 0))
> + goto errout;
> +
> + if (*options && HPSA_DIAG_OPTS_DISABLE_RLD_CACHING)
> + goto out;
> + else {
> +errout:
> + dev_err(&h->pdev->dev,
> + "Error: failed to disable report lun data caching.\n");
> + }
> +out:
> + cmd_free(h, c);
> + kfree(options);
> +}
The last if statement looks too complicated - what about :
+ if (*options && HPSA_DIAG_OPTS_DISABLE_RLD_CACHING)
goto out;
+errout:
+ dev_err(&h->pdev->dev,
+ "Error: failed to disable report lun data caching.\n");
+out:
+ cmd_free(h, c);
+ kfree(options);
+}
> +
> static void hpsa_shutdown(struct pci_dev *pdev)
> {
> struct ctlr_info *h;
> diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
> index c83eaf1..4910344 100644
> --- a/drivers/scsi/hpsa_cmd.h
> +++ b/drivers/scsi/hpsa_cmd.h
> @@ -287,6 +287,9 @@ struct SenseSubsystem_info {
> #define BMIC_SENSE_CONTROLLER_PARAMETERS 0x64
> #define BMIC_IDENTIFY_PHYSICAL_DEVICE 0x15
> #define BMIC_IDENTIFY_CONTROLLER 0x11
> +#define BMIC_SET_DIAG_OPTIONS 0xF4
> +#define BMIC_SENSE_DIAG_OPTIONS 0xF5
> +#define HPSA_DIAG_OPTS_DISABLE_RLD_CACHING 0x40000000
>
> /* Command List Structure */
> union SCSI3Addr {
>
> --
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