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authorKashyap, Desai <kashyap.desai@lsi.com>2009-12-16 18:56:28 +0530
committerJames Bottomley <James.Bottomley@suse.de>2010-02-08 18:19:44 -0600
commit84f0b04a0e3b279a0b0a851b93eb403a626ca4b8 (patch)
tree0e7437b032ad129b3b0f97c96c5831ef44b3967b /drivers/scsi
parentf4af3c14113d1b0d98d5a5e717b8aa1f484065b6 (diff)
[SCSI] mpt2sas: Enable TLR for SSP TAPE drives (Added SAS Transport APIs)
If TLR is supported for end device, MPT2SAS driver will enable the TLR bit in the SCSI_IO for every request. If there is a response with MPI2_SCSITASKMGMT_RSP_INVALID_FRAME, the driver will turn off the TLR logic. [jejb: updated to new transport class TLR API] Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Reviewed-by: Eric Moore <Eric.moore@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_scsih.c55
1 files changed, 35 insertions, 20 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index ca984cbc8e2..344a22ad2f3 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -1309,7 +1309,6 @@ _scsih_slave_alloc(struct scsi_device *sdev)
struct MPT2SAS_DEVICE *sas_device_priv_data;
struct scsi_target *starget;
struct _raid_device *raid_device;
- struct _sas_device *sas_device;
unsigned long flags;
sas_device_priv_data = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
@@ -1336,21 +1335,8 @@ _scsih_slave_alloc(struct scsi_device *sdev)
if (raid_device)
raid_device->sdev = sdev; /* raid is single lun */
spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
- } else {
- /* set TLR bit for SSP devices */
- if (!(ioc->facts.IOCCapabilities &
- MPI2_IOCFACTS_CAPABILITY_TLR))
- goto out;
- spin_lock_irqsave(&ioc->sas_device_lock, flags);
- sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
- sas_device_priv_data->sas_target->sas_address);
- spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
- if (sas_device && sas_device->device_info &
- MPI2_SAS_DEVICE_INFO_SSP_TARGET)
- sas_device_priv_data->flags |= MPT_DEVICE_TLR_ON;
}
- out:
return 0;
}
@@ -1617,6 +1603,32 @@ _scsih_get_volume_capabilities(struct MPT2SAS_ADAPTER *ioc,
}
/**
+ * _scsih_enable_tlr - setting TLR flags
+ * @ioc: per adapter object
+ * @sdev: scsi device struct
+ *
+ * Enabling Transaction Layer Retries for tape devices when
+ * vpd page 0x90 is present
+ *
+ */
+static void
+_scsih_enable_tlr(struct MPT2SAS_ADAPTER *ioc, struct scsi_device *sdev)
+{
+ /* only for TAPE */
+ if (sdev->type != TYPE_TAPE)
+ return;
+
+ if (!(ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR))
+ return;
+
+ sas_enable_tlr(sdev);
+ sdev_printk(KERN_INFO, sdev, "TLR %s\n",
+ sas_is_tlr_enabled(sdev) ? "Enabled" : "Disabled");
+ return;
+
+}
+
+/**
* _scsih_slave_configure - device configure routine.
* @sdev: scsi device struct
*
@@ -1761,8 +1773,10 @@ _scsih_slave_configure(struct scsi_device *sdev)
_scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
- if (ssp_target)
+ if (ssp_target) {
sas_read_port_mode_page(sdev);
+ _scsih_enable_tlr(ioc, sdev);
+ }
return 0;
}
@@ -3049,7 +3063,7 @@ _scsih_qcmd(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
} else
mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
- if ((sas_device_priv_data->flags & MPT_DEVICE_TLR_ON))
+ if (sas_is_tlr_enabled(scmd->device))
mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;
smid = mpt2sas_base_get_smid_scsiio(ioc, ioc->scsi_io_cb_idx, scmd);
@@ -3438,10 +3452,11 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
le32_to_cpu(mpi_reply->ResponseInfo) & 0xFF;
if (!sas_device_priv_data->tlr_snoop_check) {
sas_device_priv_data->tlr_snoop_check++;
- if ((sas_device_priv_data->flags & MPT_DEVICE_TLR_ON) &&
- response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME)
- sas_device_priv_data->flags &=
- ~MPT_DEVICE_TLR_ON;
+ if (sas_is_tlr_enabled(scmd->device) &&
+ response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME) {
+ sas_disable_tlr(scmd->device);
+ sdev_printk(KERN_INFO, scmd->device, "TLR disabled\n");
+ }
}
xfer_cnt = le32_to_cpu(mpi_reply->TransferCount);