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authorKashyap, Desai <kashyap.desai@lsi.com>2009-12-16 16:31:13 +0300
committerJames Bottomley <James.Bottomley@suse.de>2010-01-18 19:48:10 +0300
commit65f89c2396aa113a06fe7e2f6ba46f0712cb4806 (patch)
treed5b17f982a8071d7b757f140e20bb7d878d9479e /drivers/message
parent02507a80b35edd720480540d917e9f92cc371009 (diff)
downloadlinux-65f89c2396aa113a06fe7e2f6ba46f0712cb4806.tar.xz
[SCSI] mptfusion: Added MPI_SCSIIO_CONTROL_HEADOFQ priority
There is a 'ioprio' field in the BIO and the Request structure. check this priority field and set MPI_SCSIIO_CONTROL_HEADOFQ to pass down I/O priority. An enhancement to the LSI Disk Array Controller firmware is being developed to look at the Head Of Queue bit to allow I/Os with the HOQ bit set to be processed before I/Os which do not have the HOQ bit set. In order to set the HOQ bit, the mpt fusion driver needs to look at the 'ioprio' field in the request structure associated with the scsi command. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/message')
-rw-r--r--drivers/message/fusion/mptscsih.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 57752751712b..8128d3095f9f 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1438,9 +1438,14 @@ mptscsih_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
&& (vdevice->vtarget->tflags & MPT_TARGET_FLAGS_Q_YES)
&& (SCpnt->device->tagged_supported)) {
scsictl = scsidir | MPI_SCSIIO_CONTROL_SIMPLEQ;
- } else {
+ if (SCpnt->request && SCpnt->request->ioprio) {
+ if (((SCpnt->request->ioprio & 0x7) == 1) ||
+ !(SCpnt->request->ioprio & 0x7))
+ scsictl |= MPI_SCSIIO_CONTROL_HEADOFQ;
+ }
+ } else
scsictl = scsidir | MPI_SCSIIO_CONTROL_UNTAGGED;
- }
+
/* Use the above information to set up the message frame
*/