linux-toradex.git/drivers/scsi/isci/task.c, branch v3.6-rc1

isci: Check IDEV_GONE before performing abort path operations.

2012-05-17T21:33:43+00:00

In the link fail path, set IDEV_GONE for every device on the domain
when the last link in the port fails.

In the abort path functions like isci_reset_device, make sure that
there has not already been a detected domain failure with the device
by checking IDEV_GONE, before performing any kind of hard reset, SMP
phy control, or TMF operation.

The check for IDEV_GONE makes sure that the device in the abort path
really has control of the port with which it is associated.  This
prevents starting hard resets at incorrect times and scheduling
unnecessary LUN resets for SATA devices.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Directly control IREQ_ABORT_PATH_ACTIVE when completing TMFs.

2012-05-17T21:33:42+00:00

TMF requests, unlike normal I/O requests, need to handle I/O management
conditions in the completion function because TMFs are not handled in the
completion tasklet.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Manage tag releases differently when aborting tasks.

2012-05-17T21:33:41+00:00

When an individual request is being terminated, the request's tag
is managed in the terminate function.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Implement waiting for suspend in the abort path.

2012-05-17T21:33:41+00:00

In order to prevent a device from receiving an I/O request while still
in an RNC suspending or resuming state (and therefore failing that
I/O back to libsas with a reset required status) wait for the RNC state
change before proceding in the abort path.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Make sure all TCs are terminated and cleaned in LUN reset.

2012-05-17T21:33:40+00:00

In the libsas error path, SATA disks require extra handling in
libata to recover operation.  However, libsas expects to be able
to immediately recover all outstanding I/O once the error handler
escalation stops.  This patch fixes the condition where the libata
error handler is scheduled for operation but libsas has already
deleted the outstanding sas_tasks.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Remove isci_device reqs_in_process and dev_node from isci_device.

2012-05-17T21:33:39+00:00

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Device access in the error path does not depend on IDEV_GONE.

2012-05-17T21:33:39+00:00

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Redesign device suspension, abort, cleanup.

2012-05-17T21:33:38+00:00

This commit changes the means by which outstanding I/Os are handled
for cleanup.
The likelihood is that this commit will be broken into smaller pieces,
however that will be a later revision.  Among the changes:

- All completion structures have been removed from the tmf and
abort paths.
- Now using one completed I/O list, with the I/O completed in host bit being
used to select error or normal callback paths.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Escalate to I_T_Nexus_Reset when the device is gone.

2012-05-17T21:33:38+00:00

If LUN reset sees that the device is gone, it returns TMF_RESP_FUNC_FAILED
to cause libsas to escalate to an I_T_Nexus_Reset.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams

isci: Manage device suspensions during TC terminations.

2012-05-17T21:33:37+00:00

TCs must be terminated only while the RNC is suspended.  This commit
adds remote device suspensions and resumptions in the abort, reset and
termination paths.

Signed-off-by: Jeff Skirvin 
Signed-off-by: Dan Williams