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path: root/drivers/scsi/isci/port.h
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2012-05-17isci: Manage the link layer hang detect timer for RNC suspensions.Jeff Skirvin1-0/+5
For STP devices under certain protocol conditions, an RNC will not suspend until the current transfer state is broken with a SYNC/ESC sequence from the SCU. The SYNC/ESC driven by expiration of the SCU link layer hang detect timer, which has too small a dynamic range to support slow SATA devices, so normally it is disabled. This change enables the timer with the minimum period at the point when the suspension is requested. Note that there is potential collateral damage to other open connections to slow SATA devices on the same port, since there is no alternative but to enable the LLHANG timer on every phy in the port for the current suspension request - there is no way to tell on which phy the RNC in question is currently active. Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2012-05-17isci: kill isci_port.domain_dev_listDan Williams1-6/+0
Another unused field, and isci_port_init is overkill. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2012-02-29[SCSI] isci: debug, provide state-enum-to-string conversionsDan Williams1-63/+40
Debugging the driver requires tracing the state transtions and tracing state names is less work than decoding numbers. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-02-29[SCSI] isci: ->lldd_ata_check_ready handlerDan Williams1-0/+1
Report to libata whether the link to the given domain_device is up and the signature fis has been received. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-02-29[SCSI] isci: fix interpretation of "hard" resetDan Williams1-1/+2
A hard reset to isci in the direct-attached case is one where the driver internally manages debouncing the link. In the sas-expander-attached case a hard reset is one that clears affiliations. The driver should not be prematurely dropping affiliations at run time, that decision (to force expander hard resets to ata devices) is left to userspace to manage. So, arrange for I_T_nexus resets to be sas-link-resets in the expander-attached case and isci-hard-resets in the direct-attached case. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-02-29[SCSI] isci: kill isci_port->statusDan Williams1-5/+0
It only tracks whether the port is stopping in order to gate new devices being discovered while the port is stopping. However, since the check and subsequent handling is unlocked there is nothing to stop the port from going down immediately after the check. Driver is already prepared to handle devices arriving on stale ports, and those will be cleaned up by an eventual ->lldd_dev_gone() notification. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-02-29[SCSI] isci: kill iphy->isci_port lookupsDan Williams1-2/+0
This field is a holdover from the OS abstraction conversion. The stable phy to port lookups are done via iphy->ownining_port under scic_lock. After this conversion to use port->lldd_port the only volatile lookup is the initial lookup in isci_port_formed(). After that point any lookup via a successfully notified domain_device is guaranteed to be valid until the domain_device is destroyed. Delete ->start_complete as it is only set once and is set as a consequence of the port going link up, by definition of getting a port formed event the port is "ready". While we are correcting port lookups also move the asd_sas_port table out from under the isci_port. This is to preclude any temptation to use container_of() to convert an asd_sas_port to an isci_port, the association is dynamic and under libsas control. Tested-by: Maciej Trela <maciej.trela@intel.com> [dmilburn@redhat.com: fix i686 compile error] Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-01-16[SCSI] isci: fix, prevent port from getting stuck in the 'configuring' stateMarcin Tomczak1-0/+6
When expander connected in x2 or x4 mode and with IO runnning, if a cable from wideport is plugged out from the phy, IO's start failing on all the targets. Observed that when cable is pulled with IO running, cominit is happening on all the links and IO's start dropping to 0 and eventually the whole IO fails. Second observation, target is trying to open and SCU is responding with "Open reject no destination". A cause of the problem is when the port went from the "ready configuring substate" back to "ready configuring substate" as a result of phy being pulled off, scic suspended the port task scheduler register. As a result no IO was allowed and in the "substate configuring enter" routine the IO never goes back to 0. As a result the port never comes out of "ready substate configuring". The patch adds a mechanism of activate and deactivate phy when a port link up, which fixes the problem. Signed-off-by: Bartek Nowakowski <bartek.nowakowski@intel.com> Signed-off-by: Maciej Trela <maciej.trela@intel.com> Signed-off-by: Marcin Tomczak <marcin.tomczak@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-01-16[SCSI] isci: enable wide port targetsBartek Nowakowski1-0/+4
Arrange for task_contexts prepared for the wide targets to account for all the attached phys in the port. Signed-off-by: Bartek Nowakowski <bartek.nowakowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-10-31[SCSI] isci: revert bcn filteringDan Williams1-5/+0
The initial bcn filtering implementation was validated on a kernel baseline that predated the switch to new libata error handling. Also, prior to that conversion we borrowed the mvsas MVS_DEV_EH approach to prevent the unwanted extra ap->ops->phy_reset(ap) that occurred in the ata_bus_probe() path. After the conversion to new libata eh resets at discovery are more frequent and get filtered prematurely by IDEV_EH. The result is that our bcn filtering has been blocked from running and at discovery and it appears to stall discovery completion to the point of triggering hung task timeouts. So, revert the implementation for now. When it returns it will go into libsas proper. The domain rediscovery that takes place due to ->lldd_I_T_nexus_reset() events should now be properly waited for by the ata_port_wait_eh() call in ata_port_probe(). So the hard coded delay in the isci ->lldd_I_T_nexus_reset() and other libsas drivers should help debounce the libsas thread from seeing temporary device removals. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-10-31[SCSI] isci: Fix hard reset timeout conditions.Jeff Skirvin1-0/+1
A hard reset can timeout before or after the last phy in the port goes away. If after, then notify the OS that the last phy has failed. The recovery for the failed hard reset has been removed. This recovery code was unecessary in that the link would recover from the failure normally by a new link reset sequence or hotplug of the remote device. Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-07-03isci: kill 'get/set' macrosDan Williams1-17/+0
Most of these simple dereference macros are longer than their open coded equivalent. Deleting enum sci_controller_mode is thrown in for good measure. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: retire scic_sds_ and scic_ prefixesDan Williams1-37/+31
The distinction between scic_sds_ scic_ and sci_ are no longer relevant so just unify the prefixes on sci_. The distinction between isci_ and sci_ is historically significant, and useful for comparing the old 'core' to the current Linux driver. 'sci_' represents the former core as well as the routines that are closer to the hardware and protocol than their 'isci_' brethren. sci == sas controller interface. Also unwind the 'sds1' out of the parameter structs. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify isci_host and scic_sds_controllerDan Williams1-2/+2
Remove the distinction between these two implementations and unify on isci_host (local instances named ihost). Hmmm, we had two 'oem_parameters' instances, one was unused... nice. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify isci_remote_device and scic_sds_remote_deviceDan Williams1-3/+3
Remove the distinction between these two implementations and unify on isci_remote_device (local instances named idev). Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify isci_port and scic_sds_portDan Williams1-123/+51
Remove the distinction between these two implementations and unify on isci_port (local instances named iport). The duplicate '->owning_port' and '->isci_port' in both isci_phy and isci_remote_device will be fixed in a later patch... this is just the straightforward rename/unification. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify isci_phy and scic_sds_phyDan Williams1-8/+8
They are one in the same object so remove the distinction. The near duplicate fields (owning_port, and isci_port) will be cleaned up after the scic_sds_port isci_port unification. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify isci_request and scic_sds_requestDan Williams1-3/+3
They are one in the same object so remove the distinction. The near duplicate fields (owning_controller, and isci_host) will be cleaned up after the scic_sds_contoller isci_host unification. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify can_queue tracking on the tci_pool, uplevel tag assignmentDan Williams1-1/+1
The tci_pool tracks our outstanding command slots which are also the 'index' portion of our tags. Grabbing the tag early in ->lldd_execute_task let's us drop the isci_host_can_queue() and ->was_tag_assigned_by_user infrastructure. ->was_tag_assigned_by_user required the task context to be duplicated in request-local buffer. With the tci established early we can build the task_context directly into its final location and skip a memcpy. With the task context buffer at a known address at request construction we have the opportunity/obligation to also fix sgl handling. This rework feels like it belongs in another patch but the sgl handling and task_context are too intertwined. 1/ fix the 'ab' pair embedded in the task context to point to the 'cd' pair in the task context (previously we were prematurely linking to the staging buffer). 2/ fix the broken iteration of pio sgls that assumes all sgls are relative to the request, and does a dangerous looking reverse lookup of physical address to virtual address. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: filter broadcast change notifications during SMP phy resetsJeff Skirvin1-0/+5
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>
2011-07-03isci: state machine cleanupEdmund Nadolski1-9/+9
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>
2011-07-03isci: replace isci_timer list with proper embedded timersEdmund Nadolski1-4/+2
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>
2011-07-03isci: unify port start_io and complete_io handlersDan Williams1-53/+2
Unify the handlers and kill the state handler infrastructure. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify port link_up and link_down handlersPiotr Sawicki1-10/+4
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>
2011-07-03isci: remove port frame and event handlersPiotr Sawicki1-3/+0
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>
2011-07-03isci: unify port reset, add_phy, and remove_phy handlersPiotr Sawicki1-19/+0
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>
2011-07-03isci: remove port destruct handlerPiotr Sawicki1-6/+0
The handler was never used. Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify port stop handlersPiotr Sawicki1-6/+1
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>
2011-07-03isci: remove port start handlerPiotr Sawicki1-6/+2
remove the handler from the port state handler table and implement the logic directly in scic_sds_port_start(). Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> [remove a level of indirection] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: merge port ready substates into primary state machinePiotr Sawicki1-36/+21
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>
2011-07-03isci: uplevel port infrastructureDan Williams1-35/+390
* Move port configuration agent implementation * Merge core/scic_sds_port.[ch] into port.[ch] Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: unify constantsDan Williams1-0/+3
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>
2011-07-03isci: unify port data structuresDan Williams1-16/+9
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>
2011-07-03isci: unify isci_host data structuresArtur Wojcik1-5/+0
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>
2011-07-03isci: move remote_device handling out of the coreDan Williams1-0/+1
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>
2011-07-03isci: fix fragile/conditional isci_host lookupsDan Williams1-3/+2
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>
2011-07-03isci: Remove event_* calls as they are just wrappersDave Jiang1-0/+10
Removed isci_event_* calls and call those functions directly. Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: replace remote_device_lock with scic_lockDan Williams1-1/+0
The remote_device_lock is currently used to protect a controller global resource (RNCs), but the remote_device_lock is per-port. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03isci: kill "host quiesce" mechanismDan Williams1-1/+0
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>
2011-07-02isci: Intel(R) C600 Series Chipset Storage Control Unit DriverDan Williams1-0/+153
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>
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