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authorMark Haverkamp <markh@osdl.org>2006-09-19 08:59:43 -0700
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-23 20:09:03 -0500
commit653ba58d55feb708c6f97e6f3e84901b3a03c9c0 (patch)
tree833d63cf7fac90e693f0a2503e90d4a1f7362b9d
parent65101355450df2d935f8d56ac3abef279f28a0e2 (diff)
[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>
-rw-r--r--drivers/scsi/aacraid/aachba.c6
-rw-r--r--drivers/scsi/aacraid/linit.c5
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index b14f7cac30e9..ac108f9e2674 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -169,6 +169,10 @@ MODULE_PARM_DESC(numacb, "Request a limit to the number of adapter control block
int acbsize = -1;
module_param(acbsize, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(acbsize, "Request a specific adapter control block (FIB) size. Valid values are 512, 2048, 4096 and 8192. Default is to use suggestion from Firmware.");
+
+int expose_physicals = 0;
+module_param(expose_physicals, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(expose_physicals, "Expose physical components of the arrays. 0=off, 1=on");
/**
* aac_get_config_status - check the adapter configuration
* @common: adapter to query
@@ -1535,7 +1539,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd)
return 0;
}
} else { /* check for physical non-dasd devices */
- if(dev->nondasd_support == 1){
+ if ((dev->nondasd_support == 1) || expose_physicals) {
if (dev->in_reset)
return -1;
return aac_send_srb_fib(scsicmd);
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;