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scsi: mpt3sas: Recognize and act on iopriority info

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This patch adds support for request iopriority handling in the mpt3sas
layer. This works only when a ATA device is behind the SATL. The ATA
device also has to indicate that it supports command priorities in the
identify information that is pulled from the SATL.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
Acked-by: Sreekanth Reddy <Sreekanth.Reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Adam Manzanares
2016-12-12 16:31:40 -08:00
committed by Martin K. Petersen
parent 093df73771
commit 307d9075a0
3 changed files with 80 additions and 3 deletions
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34
drivers/scsi/mpt3sas/mpt3sas_scsih.c
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@@ -4053,6 +4053,8 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
struct MPT3SAS_DEVICE *sas_device_priv_data;
struct MPT3SAS_TARGET *sas_target_priv_data;
struct _raid_device *raid_device;
struct request *rq = scmd->request;
int class;
Mpi2SCSIIORequest_t *mpi_request;
u32 mpi_control;
u16 smid;
@@ -4115,7 +4117,12 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
/* set tags */
mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
/* NCQ Prio supported, make sure control indicated high priority */
if (sas_device_priv_data->ncq_prio_enable) {
class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
if (class == IOPRIO_CLASS_RT)
mpi_control |= 1 << MPI2_SCSIIO_CONTROL_CMDPRI_SHIFT;
}
/* Make sure Device is not raid volume.
* We do not expose raid functionality to upper layer for warpdrive.
*/
@@ -9099,6 +9106,31 @@ scsih_pci_mmio_enabled(struct pci_dev *pdev)
return PCI_ERS_RESULT_RECOVERED;
}
/**
* scsih__ncq_prio_supp - Check for NCQ command priority support
* @sdev: scsi device struct
*
* This is called when a user indicates they would like to enable
* ncq command priorities. This works only on SATA devices.
*/
bool scsih_ncq_prio_supp(struct scsi_device *sdev)
{
unsigned char *buf;
bool ncq_prio_supp = false;
if (!scsi_device_supports_vpd(sdev))
return ncq_prio_supp;
buf = kmalloc(SCSI_VPD_PG_LEN, GFP_KERNEL);
if (!buf)
return ncq_prio_supp;
if (!scsi_get_vpd_page(sdev, 0x89, buf, SCSI_VPD_PG_LEN))
ncq_prio_supp = (buf[213] >> 4) & 1;
kfree(buf);
return ncq_prio_supp;
}
/*
* The pci device ids are defined in mpi/mpi2_cnfg.h.
*/