Dan Williams [Thu, 9 Jun 2011 23:04:28 +0000 (16:04 -0700)]
isci: cleanup/optimize queue increment macros
Every single i/o or event completion incurs a test and branch to see if
the cycle bit changed. For power-of-2 queue sizes the cycle bit can be
read directly from the rollover of the queue pointer.
Likely premature optimization, but the hidden if() and hidden
assignments / side-effects in the macros were already asking to be
cleaned up.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Thu, 9 Jun 2011 18:06:58 +0000 (11:06 -0700)]
isci: cleanup tag macros
A tag is a 16 bit number where the upper four bits is a sequence number
and the remainder is the task context index (tci). Sanitize the macro
names and shave 256-bytes out of scic_sds_controller by reducing the size of
io_request_sequence.
Dan Williams [Wed, 8 Jun 2011 01:50:55 +0000 (18:50 -0700)]
isci: cleanup/optimize pool implementation
The circ_buf macros are ~6% faster, as measured by perf, because they take
advantage of power-of-two math assumptions i.e. no test and branch for
rollover. Their semantics are clearer than the hidden side effects in pool.h
(like sci_pool_get() which hides an assignment).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Mon, 20 Jun 2011 22:11:22 +0000 (15:11 -0700)]
isci: fix isci_terminate_pending() list management
Walk through the list of pending requests being careful to consider that
multiple requests can be terminated when the lock is dropped (i.e.
invalidating the 'next' reference established by
list_for_each_entry_safe).
Also noticed that all callers to isci_terminate_pending_requests()
specifying terminating, so just drop the parameter.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
In the situation where a termination of an I/O times-out,
make sure that the linkage from the request to the task
is severed completely. Also make sure that the selection
of tasks to terminate occurs under scic_lock.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Jeff Skirvin [Mon, 20 Jun 2011 21:09:06 +0000 (14:09 -0700)]
isci: Add decode for SMP request retry error condition
There are situations with slow expanders in which a first attempt
to execute an SMP request will fail with a timeout. Immediate
subsequent retries will generally succeed. This change makes sure
SMP I/O failures are immediately failed to libsas so that retries
happen with no discovery process timeout delay.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Jeff Skirvin [Tue, 21 Jun 2011 19:16:33 +0000 (12:16 -0700)]
isci: filter broadcast change notifications during SMP phy resets
When resetting a sata device in the domain we have seen occasions where
libsas prematurely marks a device gone in the time it takes for the
device to re-establish the link. This plays badly with software raid
arrays. Other libsas drivers have non-uniform delays in their reset
handlers to try to cover this condition, but not sufficient to close the
hole. Given that a sata device can take many seconds to recover we
filter bcns and poll for the device reattach state before notifying
libsas that the port needs the domain to be rediscovered. Once this has
been proven out at the lldd level we can think about uplevelling this
feature to a common implementation in libsas.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
[ use kzalloc instead of kmem_cache ] Signed-off-by: Dave Jiang <dave.jiang@intel.com>
[ use eventq and time macros ] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Wed, 1 Jun 2011 23:00:01 +0000 (16:00 -0700)]
isci: remove 'min memory' infrastructure
The old 'core' had aspirations of running in severely memory constrained
environments like bios option-rom, it's not needed for Linux and gets in
the way of other cleanups (like unifying/reducing the number of structure
members in scic_sds_controller/isci_host).
This also fixes a theoretical bug in that the driver would blindly override
the silicon advertised limits for number of ports, task contexts, and remote
node contexts.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Adam Gruchala [Wed, 1 Jun 2011 22:31:03 +0000 (22:31 +0000)]
isci: Added support for C0 to SCU Driver
C0 silicon updates the pci revision id and requires new AFE parameters
for phy signal integrity. Support for previous silicon revisions is
deprecated (it's also broken for the theoretical case of multiple
controllers at different silicon revisions, all the more reason to get
it removed as soon as possible)
Signed-off-by: Adam Gruchala <adam.gruchala@intel.com>
[fixed up deprecated silicon support] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Edmund Nadolski [Thu, 2 Jun 2011 00:10:50 +0000 (00:10 +0000)]
isci: additional state machine cleanup
Additional state machine cleanups:
o Remove static functions sci_state_machine_exit_state() and
sci_state_machine_enter_state()
o Combines sci_base_state_machine_construct() and
sci_base_state_machine_start() into a single function,
sci_init_sm()
o Remove sci_base_state_machine_stop() which is unused.
o Kill state_machine.[ch]
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
[fixed too large to inline functions] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Edmund Nadolski [Thu, 2 Jun 2011 00:10:43 +0000 (00:10 +0000)]
isci: state machine cleanup
This cleans up several areas of the state machine mechanism:
o Rename sci_base_state_machine_change_state to sci_change_state
o Remove sci_base_state_machine_get_state function
o Rename 'state_machine' struct member to 'sm' in client structs
o Shorten the name of request states
o Shorten state machine state names as follows:
SCI_BASE_CONTROLLER_STATE_xxx to SCIC_xxx
SCI_BASE_PHY_STATE_xxx to SCI_PHY_xxx
SCIC_SDS_PHY_STARTING_SUBSTATE_xxx to SCI_PHY_SUB_xxx
SCI_BASE_PORT_STATE_xxx to SCI_PORT_xxx and
SCIC_SDS_PORT_READY_SUBSTATE_xxx to SCI_PORT_SUB_xxx
SCI_BASE_REMOTE_DEVICE_STATE_xxx to SCI_DEV_xxx
SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_xxx to SCI_STP_DEV_xxx
SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_xxx to SCI_SMP_DEV_xxx
SCIC_SDS_REMOTE_NODE_CONTEXT_xxx_STATE to SCI_RNC_xxx
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dave Jiang [Wed, 25 May 2011 02:21:57 +0000 (02:21 +0000)]
isci: removing the kmalloc in smp request construct
It doesn't look like there is any reason to do a kmalloc. We can do the
byte swap in place and avoid the allocation. This allow us to remove
a kmalloc and a memcpy.
Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Edmund Nadolski [Thu, 19 May 2011 11:59:10 +0000 (11:59 +0000)]
isci: replace isci_timer list with proper embedded timers
Rather than preallocating a list of timers and doling them out at runtime,
embed a struct timerlist in each object that needs one. A struct sci_timer
interface is introduced to manage the timer cancellation semantics which
currently need to guarantee the timer is cancelled while holding
spin_lock(ihost->scic_lock). Since the timeout functions also need to acquire
the lock it currently prevents the driver from using del_timer_sync() for
runtime cancellations.
del_timer_sync() is used however before the objects go out of scope.
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Thu, 12 May 2011 19:10:14 +0000 (19:10 +0000)]
isci: unify port link_up and link_down handlers
Unify the handlers and kill the state handler implementations.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Thu, 12 May 2011 19:10:08 +0000 (19:10 +0000)]
isci: remove port frame and event handlers
Unused infrastructure.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Thu, 12 May 2011 19:10:03 +0000 (19:10 +0000)]
isci: unify port reset, add_phy, and remove_phy handlers
Unify the implementations and remove the state handlers.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Wed, 11 May 2011 23:52:31 +0000 (23:52 +0000)]
isci: unify port stop handlers
Implement the stop handlers directly in scic_sds_port_stop()
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Wed, 11 May 2011 23:52:21 +0000 (23:52 +0000)]
isci: merge port ready substates into primary state machine
This conversion was complicated by the fact that the ready state exit routine
took unconditional action beyond just stopping the substate machine (like in
previous conversions). In order to ensure identical behaviour every state
transition needs to be instrumented to catch ready-->!ready transitions and
execute scic_sds_port_invalidate_dummy_remote_node()
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com>
[fix ready state exit handling] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Thu, 12 May 2011 13:00:31 +0000 (06:00 -0700)]
isci: clarify phy to port lookups
While cleaning up the driver it is very tempting to convert scic_sds_get_*
macros to their open coded equivalent. They are all just pointer dereferences
*except* scic_sds_phy_get_port() which returns NULL if the phy is assigned to
the dummy port. Clarify this by renaming it to phy_get_non_dummy_port().
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Adam Gruchala [Tue, 10 May 2011 23:54:23 +0000 (23:54 +0000)]
isci: merge phy substates
Merged states and substates into one state machine, as we always
unconditionally transitioned to the substate machine it was straightforward to
enter that substate from the starting state.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Adam Gruchala <adam.gruchala@intel.com>
[fixed construction, starting_state_enter, and starting check] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Wed, 11 May 2011 15:27:47 +0000 (08:27 -0700)]
isci: remove request task context completion state handler
Unlike the other conversions this only updates
scic_sds_io_request_tc_completion() to call the old state handlers directly
(with less verbose names). This was done for future patch readability, the
implementations have only minor differences for different completion codes.
Without a reference to the function name it would be difficult to dicern which
state is being updated. Considered changing the order to look up the
completion code before the state but that was not a clean conversion either.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Piotr Sawicki [Tue, 10 May 2011 23:50:32 +0000 (23:50 +0000)]
isci: unify request start handlers
Unify the implementation in scic_sds_request_start and kill the state
handler.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com>
[remove scic_sds_request_constructed_state_start_handler] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Tue, 10 May 2011 09:28:49 +0000 (02:28 -0700)]
isci: merge stp request substates into primary state machine
Remove usage of the request substate machine for stp requests, and kill
the request substate infrastructure.
Similar to the previous conversions this adds the substates to the
primary state machine and arranges for the 'started' state to transition
to the proper stp substate.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Tue, 10 May 2011 09:28:48 +0000 (02:28 -0700)]
isci: merge smp request substates into primary state machine
Remove usage of the request substate machine for smp requests identified by:
task->task_proto == SAS_PROTOCOL_SMP
While merging over the smp_request infrastructure noticed that all the
assign buffer implementations are now equal, so moved it to
scic_sds_general_request_construct.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Tue, 10 May 2011 09:28:47 +0000 (02:28 -0700)]
isci: merge ssp task management substates into primary state machine
Remove usage of the request substate machine for ssp task management
requests identified by:
ireq->ttype == tmf_task && dev->dev_type == SAS_END_DEV;
The only routine that checks the base 'started' state is
scic_sds_io_request_tc_completion which calls the substate machine
handler if we are not in the 'started' state or we are 'started' and no
substate machine is defined. This routine requires no conversion
because we have transitioned out of 'started' and the substate routine
will be called naturally as a result.
There are also no side effects of this conversion on exiting the
'started', state because it only stops the substate machine, which is no
longer relevant for this transaction type.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Sun, 8 May 2011 22:49:15 +0000 (15:49 -0700)]
isci: unify constants
cross driver constants are spread out over multiple header files, consolidate
them into isci.h, and push some includes out to the source files that need
them.
TODO: remove SCI_MODE_SIZE infrastructure.
TODO: task.h is full of inlines that are too large
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Sun, 8 May 2011 18:47:15 +0000 (11:47 -0700)]
isci: unify request data structures
Make scic_sds_request a proper member of isci_request. Also let's us
get rid of the dma pool object size tracking since we now know that all
requests are sizeof(isci_request). While cleaning up the construct
routine incidentally replaced SCI_FIELD_OFFSET with offsetof.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Sun, 8 May 2011 02:07:14 +0000 (19:07 -0700)]
isci: move task context alignment from run-time to compile time
Remove usage of PTR_ALIGN by arranging for the task context to be aligned by
the compiler. Another step towards unifying isci_request and
scic_sds_request. Once this is complete the task context in the request can
likely be removed in favor of building the task directly to tc memory (see:
scic_sds_controller_copy_task_context). It's not clear why this needs to be
cacheline aligned if we just end up copying before submission...
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Sat, 7 May 2011 17:11:43 +0000 (10:11 -0700)]
isci: unify port data structures
Make scic_sds_port a member of isci_port and merge their lifetimes which
means removing the port table from scic_sds_controller in favor of the
one at the isci_host level. Merge ihost->sas_ports into ihost->ports.
_ Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Sat, 7 May 2011 00:36:38 +0000 (17:36 -0700)]
isci: unify phy data structures
Make scic_sds_phy a member of isci_phy and merge their lifetimes which
means removing the phy table from scic_sds_controller in favor of the
one at that isci_host level.
Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dan Williams [Mon, 2 May 2011 20:59:25 +0000 (13:59 -0700)]
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>
Dan Williams [Fri, 6 May 2011 00:47:44 +0000 (17:47 -0700)]
isci: fix ata locking
Upstream commit a29b5dad "libata: fix locking for sas paths" switched
libsas ata locking to the ata_host lock. We need to do the same when
returning ata tasks from the execute path.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dave Jiang [Thu, 5 May 2011 01:28:32 +0000 (18:28 -0700)]
isci: Remove SCIC_SWAP_DWORD()
Use Linux native swab32() call instead of SCIC_SWAP_DWORD().
We need to swab() because the hardware munges the data into a
"big-endian dword" stream which is byte-swapped from the sas definition
regardless of host endian.
Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dave Jiang [Thu, 5 May 2011 01:22:33 +0000 (18:22 -0700)]
isci: fixup SAS iaf protocols data structure
Moved the actual data structure that's read from the phy register to phy
header. Removed the parsing of identify address frame protocol bits as
that seemed not necessary and we can use existing information.
Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dave Jiang [Thu, 5 May 2011 00:53:24 +0000 (17:53 -0700)]
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>
Dave Jiang [Wed, 4 May 2011 23:16:44 +0000 (16:16 -0700)]
isci: renaming sas_capabilities to scic_phy_cap
This seems to be a data structure that represents the phy capabilities
register from the hardware and has nothing to do with SAS data structs.
Moving and fixup
Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Dave Jiang [Wed, 4 May 2011 22:02:03 +0000 (15:02 -0700)]
isci: Convert ATA defines to Linux native defines
* Removing all intel_sata and intel_ata defines
* Removing the usage of SAT_PROTOCOL_*. We can get everything from sas_task
* Moved SATA FIS types to local sas.h. These defines will have to go
into include/scsi/sas.h eventually.
* Added offsets for SATA FIS header in order to grab the values
Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
projects / mirror_ubuntu-disco-kernel.git / log