Commit Graph

34 Commits

Author SHA1 Message Date
Dan Williams
0d84366fbe isci: make sgl explicit/aligned request object member
Towards unifying request objects we need all members to be defined in the
object and not carved out of anonymous buffer space.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:47 -07:00
Dan Williams
827a84d4e0 isci: move stp request info to scic_sds_request
In preparation for unifying allocation of all request information make stp
data available in all requests.  Incidentally collapse indentation.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:47 -07:00
Artur Wojcik
cc3dbd0a91 isci: unify isci_host data structures
Make it explicit that isci_host and scic_sds_controller are one in the same
object.

Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>
[removed ->ihost back pointer]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:46 -07:00
Dan Williams
d06b487b78 isci: implement I_T_nexus_reset
This is a requirement for 2.6.39's new libata eh.

Still some questions about lldd_dev_gone racing against dev->lldd_dev
lookups, but we are at least no more broken than mvsas in this regard.

We also short-circuit I_T_nexus_reset invocations from the device
discovery path (IDEV_EH similar to MVS_DEV_EH) to filter out the
resulting domain rediscoveries triggered by the reset.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:46 -07:00
Dave Jiang
af5ae89350 isci: Convert of sci_ssp_response_iu to ssp_response_iu
Converting to Linux native format. However the isci driver does a lot of
the calculation based on the max size of this data structure and the
Linux data structure only has a pointer to the response data. Thus the
sizeof(struct ssp_response_iu) will be incorrect and we need to define
the max size.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:46 -07:00
Dave Jiang
0cfa890e5a isci: Fixup SSP command IU and task IU
Fixup of SSP command IU and SSP task IU to something that looks like Linux

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:46 -07:00
Dave Jiang
f2f300806f isci: Convert SATA fis data structures to Linux native
Converting of sata_fis_reg_d2h to dev_to_host_fis
Converting of sata_fis_reg_h2d to host_to_dev_fis

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:45 -07:00
Maciej Patelczyk
890cae9b8a isci: Removed sci_base_object from scic_sds_request.
The 'struct sci_base_object' was removed from the struct
scic_sds_request and was replaced by a pointer to
struct isci_request.

Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00
Dave Jiang
d2d61433a8 isci: Remove excessive log noise with expander hot-unplug
We are logging excessive output when hot unplug from expander. Moving
that to debug.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00
Dan Williams
a1a113b0a1 isci: kill smp_discover_response_protocols in favor of domain_device.dev_type
This is step 1 of removing the contortions to:
1/ unparse expander phy data into a smp discover frame
2/ open-code-parse the smp discover fram into a domain_device.dev_type equivalent

libsas has already spent cycles determining the dev_type, so now that
scic_sds_remote_device is unified with isci_remote_device we can
directly reference dev_type.

This might also change multi-level expander detection as we previously only
looked at dev_type == EDGE_DEV and we did not consider the FANOUT_DEV case.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00
Dan Williams
88f3b62ac1 isci: move remote_device handling out of the core
Now that the core/lldd remote_device data structures are nominally unified
merge the corresponding sources into the top-level directory.  Also move the
remote_node_context infrastructure which has no analog at the lldd level.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00
Dan Williams
57f20f4ed6 isci: unify remote_device data structures
Make it explicit that isci_remote_device and scic_sds_remote_device are
one in the same object.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:38 -07:00
Bartosz Barcinski
6cb4d6b382 isci: audit usage of BUG_ON macro in isci driver
Removes unnecessary usage of BUG_ON macro, excluding core directory.
In some cases macro is unnecesary, check is done in caller function.
In other cases macro is replaced by if construction with
appropriate warning.

Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
[changed some survivable bug conditions to WARN_ONCE]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:37 -07:00
Bartosz Barcinski
467e855a03 isci: sparse warnings cleanup
Clean warnings and errors reported by sparse tool.

request.c:430:50: warning: mixing different enum types
remote_device.c:534:39: warning: symbol 'flags' shadows an earlier one
task.c:495:44: warning: mixing different enum types
scic_sds_controller.c:2155:24: warning: mixing different enum types
scic_sds_controller.c:2272:36: warning: mixing different enum types
scic_sds_controller.c:2911:38: warning: incorrect type in initializer (different address spaces)
scic_sds_controller.c:2913:25: warning: incorrect type in argument 2 (different address spaces)
scic_sds_request.c:875:34: warning: cast removes address space of expression
scic_sds_request.c:876:123: warning: incorrect type in argument 2 (different address spaces)
scic_sds_port.c:585:51: warning: incorrect type in assignment (different address spaces)
scic_sds_port.c:712:9: warning: incorrect type in argument 2 (different address spaces)
scic_sds_port.c:1770:25: warning: incorrect type in argument 2 (different address spaces)

Signed-off-by: Bartosz Barcinski <Bartosz.Barcinski@intel.com>
Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
[fixed up some false positives and misconversions]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:37 -07:00
Christoph Hellwig
c629582d0d isci: remove scic_controller state handlers
Remove the state handler indirections for the scic_controller, and replace
them with procedural calls that check for the correct state first.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:37 -07:00
Dan Williams
4393aa4e6b isci: fix fragile/conditional isci_host lookups
A domain_device can always reference back to ->lldd_ha unlike local lldd
structures.  Fix up cases where the driver uses local objects to look up the
isci_host.  This also changes the calling conventions of some routines to
expect a valid isci_host parameter rather than re-lookup the pointer on entry.

Incidentally cleans up some macros that are longer to type than the open-coded
equivalent:
  isci_host_from_sas_ha
  isci_dev_from_domain_dev

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:36 -07:00
Jeff Skirvin
ed8a72d108 isci: Qualify when the host lock is managed for STP/SATA callbacks.
In the case of internal discovery related STP/SATA I/O started
through sas_execute_task the host lock is not taken by libsas before
calling lldd_execute_task, so the lock should not be managed before
calling back to libsas through task->task_done or sas_task_abort.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:36 -07:00
Jeff Skirvin
f219f010a3 isci: Properly handle requests in the "aborting" state.
When a TMF times-out, the request is set back to "aborting".
Requests in the "aborting" state must be terminated when
LUN and device resets occur.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:36 -07:00
Dan Williams
35173d579a isci: namespacecheck cleanups
* mark needlessly global routines static
* delete unused functions
* move kernel-doc blocks from header files to source
* reorder some functions to delete declarations
* more default handler cleanups phy

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:36 -07:00
Dan Williams
1077a57410 isci: fix incorrect assumptions about task->dev and task->dev->port being NULL
A domain_device has the same lifetime as its related scsi_target.  The
scsi_target is reference counted based on outstanding commands,
therefore it is safe to assume that if we have a valid sas_task that the
->dev pointer is also valid.

The asd_sas_port of a domain_device has the same lifetime as the driver
so it can also never be NULL as long as the sas_task is valid and the
driver is loaded.

This also cleans up isci_task_complete_for_upper_layer(), renames it to
isci_task_refuse() and notices that the isci_completion_selection
parameter was set to isci_perform_normal_io_completion by all callers.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Dan Williams
50e7f9b5a9 isci: Errors in the submit path for SATA devices manage the ap lock.
Since libsas takes the domain device sata_dev.ap->lock before submitting
a task, error completions in the submit path for SATA devices must
unlock/relock when completing the sas_task back to libsas.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
70957a94d7 isci: Fixed BUG_ON in isci_abort_task_process_cb callback.
The request may be in the "aborted" or the "completed" state when
performing a task management operation on it.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
c3f42feb0c isci: Fix TMF build for SAS/SATA LUN reset cases.
In the case where a SAS or SATA LUN reset TMF is built a NULL pointer
dereference occurred because of the (unused) callback data pointer.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
4dc043c410 isci: Termination handling cleanup, added termination timeouts.
Added a request "dead" state for use when a termination wait times-out.

isci_terminate_pending_requests now detaches the device's pending list
and terminates each entry on the detached list.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
cbb65c665b isci: Code review change for completion pointer cleanup.
Since the request structure contains a pointer to the completion to be
used if the request is being aborted or terminated, there is no reason
to pass the completion as a pointer to isci_terminate_request_core().

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
f0846c6891 isci: Cleaning up task execute path.
Made sure the device ready check accounts for all states.
Moved the aborted task check into the loop of pulling task requests
off of the submitted list.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
[remove host and device starting state checks]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
1fad9e934a isci: save the i/o tag outside the scic request structure.
The pointer to the core representation of a request is marked NULL at
completion, but we need to save the i/o tag for task management.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
[revise changelog]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:30 -07:00
Jeff Skirvin
a5fde22536 isci: fix completion / abort path.
Corrected use of the request state_lock in the completion callback.

In the case where an abort (or reset) thread is trying to terminate an
I/O request, it sets the request state to "aborting" (or "terminating")
if the state is still "starting".  One of the bugs was to never set the
state to "completed".  Another was to not correctly recognize the
situation where the I/O had completed but the sas_task was still pending
callback to task_done - this was typically a problem in the LUN and
device reset cases.

It is now possible that we leave isci_task_abort_task() with
request->io_request_completion pointing to localy allocated
aborted_io_completion struct. It may result in a system crash.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Maciej Trela <Maciej.Trela@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:29 -07:00
Jeff Skirvin
18d3d72a42 isci: isci_request_cleanup_completed_loiterer checks task before task_done
In the condition where outstanding I/Os are being cleaned from the device
requests in process list, the cleanup function needs to check that the
request is actually a sas-task and not a task management function.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:29 -07:00
Dan Williams
8acaec1593 isci: kill "host quiesce" mechanism
The midlayer is already throttling i/o in the places where host_quiesce
was trying to prevent further i/o to the device.  It's also problematic
in that it holds a lock over GFP_KERNEL allocations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:29 -07:00
Dan Williams
3a97eec6d7 isci: remove sci_device_handle
It belies the fact that isci_remote_device and scic_sds_remote_device
are one in same object with the same lifetime rules.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:29 -07:00
Dan Williams
7c40a80358 isci: rework timer api
Prepare the timer api for the arrival of dynamic creation and
destruction events from the core.  It pretended to do this previously
but the core to date only used it in a static init-time only fashion.
This is an interim fix until a cleaner event queue can be developed.

1/ make all locking external to the api (add WARN_ONCE to verify)
2/ add a timer_destroy interface (to be used by the core)
3/ use del_timer_sync() prior to deallocating timer data
4/ delete the "timer_list" indirection, we only have timers allocated
   for the isci_host
5/ fix detection of timer list allocation errors

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:28 -07:00
Dan Williams
0cf89d1d27 isci: cleanup "starting" state handling
The lldd actively disallows requests in the "starting" state.  Retrying
or holding off commands in this state is sub-optimal:
1/ it adds another state check to the fast path
2/ retrying can cause libsas to give up

However, isci's ->lldd_dev_found() routine already waits for controller
start to complete before allowing further progress.  Checking the
"starting" state in isci_task_execute_task and the isr is redundant and
misleading.  Clean this up and introduce a controller-wide event queue
to start reeling in "completion" proliferation in the driver.

The "stopping" state cleanups are in a similar vein, rely on the the isr
and other paths being precluded from occurring rather than implementing
state checking logic.

Reported-by: Christoph Hellwig <hch@infradead.org>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 03:55:27 -07:00
Dan Williams
6f231dda68 isci: Intel(R) C600 Series Chipset Storage Control Unit Driver
Support for the up to 2x4-port 6Gb/s SAS controllers embedded in the
chipset.

This is a snapshot of the first publicly available version of the driver,
commit 4c1db2d0 in the 'historical' branch.

   git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci.git historical

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-02 22:56:22 -07:00