[SCSI] aacraid: expose physical devices

Received from Mark Salyzyn:

I am placing this functionality into an insmod parameter. Normally the physical
components are exported to sg, and are blocked from showing up in sd.

Note that the pass-through I/O path via the driver through the Firmware to the
physical disks is not an optimized path, the card is designed for Hardware
RAID, elevator sorting and caching. This should not be used as a means for
utilizing the aacraid based controllers as a generic scsi/SATA/SAS controller,
performance should suck by a few percentage points, any RAID meta-data on the
drives will confuse the controller about who owns the drives and there is a
high risk of destroying content in both directions. Unreliable and for
experimentation or strange controlled circumstances only.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index d67058f80816..6e4eafa4ecee 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -82,6 +82,8 @@ static LIST_HEAD(aac_devices);
 static int aac_cfg_major = -1;
 char aac_driver_version[] = AAC_DRIVER_FULL_VERSION;
 
+extern int expose_physicals;
+
 /*
  * Because of the way Linux names scsi devices, the order in this table has
  * become important.  Check for on-board Raid first, add-in cards second.
@@ -394,6 +396,7 @@ static int aac_slave_configure(struct scsi_device *sdev)
                 sdev->skip_ms_page_3f = 1;
         }
         if ((sdev->type == TYPE_DISK) &&
+                        !expose_physicals &&
                         (sdev_channel(sdev) != CONTAINER_CHANNEL)) {
                 struct aac_dev *aac = (struct aac_dev *)sdev->host->hostdata;
                 if (!aac->raid_scsi_mode || (sdev_channel(sdev) != 2))
@@ -928,7 +931,7 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
          * all containers are on the virtual channel 0 (CONTAINER_CHANNEL)
          * physical channels are address by their actual physical number+1
          */
-        if (aac->nondasd_support == 1)
+        if ((aac->nondasd_support == 1) || expose_physicals)
                 shost->max_channel = aac->maximum_num_channels;
         else
                 shost->max_channel = 0;