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* s390: cio: Delay uevents for subchannelsCornelia Huck2007-04-27
| | | | | | | | | | | | | | | | | We often have the situation that we register a subchannel and start device recognition, only to find out that the device is not usable after all, which triggers an unregister of the subchannel. This often happens on hundreds of subchannels on a LPAR, leading to a storm of events which aren't of any use. Therefore, use uevent_suppress to delay the KOBJ_ADD uevent for a subchannel until we know that its ccw_device is to be registered. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Eric Rannaud <eric.rannaud@gmail.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [S390] SPIN_LOCK_UNLOCKED cleanup in drivers/s390Milind Arun Choudhary2007-04-27
| | | | | | | | | SPIN_LOCK_UNLOCKED cleanup,use __SPIN_LOCK_UNLOCKED instead. Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Unregister ccw devices directly.Cornelia Huck2007-04-27
| | | | | | | | | | | We used to unregister ccw devices not directly from the I/O subchannel remove function in order to avoid lifelocks on the css bus semaphore. This semaphore is gone, and there is no reason to not unregister the ccw device directly (it is even better since it is more in keeping with the goal of immediate disconnect). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: cm_enable memory leak.Cornelia Huck2007-04-27
| | | | | | | | | We allocage two pages when channel path measurements are enabled via cm_enable. We must not forget to free them again when channel path measurements are disabled again. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: ccwgroup register vs. unregister.Cornelia Huck2007-04-27
| | | | | | | | Introduce a mutex for struct ccwgroup to prevent simuntaneous register/unregister on the same ccwgroup device. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Dont call css_update_ssd_info from interrupt context.Cornelia Huck2007-04-27
| | | | | Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: fix subchannel channel-path data usagePeter Oberparleiter2007-04-27
| | | | | | | | Ensure that channel-path related subchannel data is only retrieved and used when it is valid and that it is updated when it may have changed. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: replace subchannel evaluation queue with bitmapPeter Oberparleiter2007-04-27
| | | | | | | | | | | | Use a bitmap for indicating which subchannels require evaluation instead of allocating memory for each evaluation request. This approach reduces memory consumption during recovery in case of massive evaluation request occurrence and removes the need for memory allocation failure handling. Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Re-start path verification after aborting internal I/O.Stefan Bader2007-04-27
| | | | | | | | | | | | Path verification triggered by changes to the available CHPIDs will be interrupted by another change but not re-started. This results in an invalid path mask. To solve this make sure to completely re-start path verification when changing the available paths. Signed-off-by: Stefan Bader <shbader@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Use add_uevent_var.Cornelia Huck2007-04-27
| | | | | | | | Convert ccw_uevent to use add_uevent_var and adapt snprint_alias. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Channel-path configure function.Peter Oberparleiter2007-04-27
| | | | | | | | | | | Add a new attribute to the channel-path sysfs directory through which channel-path configure operations can be triggered. Also listen for hardware events requesting channel-path configure operations and process them accordingly. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio: Clean up online_store.Cornelia Huck2007-04-27
| | | | | | | | Detangle the online_store code and make it more readable. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: observe chpid valid flagPeter Oberparleiter2007-04-27
| | | | | | | | Check validity flag of CHPID description data before continuing with channel-path initialization. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Introduce separate files for channel-path related code.Peter Oberparleiter2007-04-27
| | | | | | Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio: Allow 0 and 1 as input for channel path status attribute.Peter Oberparleiter2007-04-27
| | | | | | | | | | Channel path status can now be modified by writing '0' and '1' to the sysfs status attribute in addition to 'offline' and 'online' respectively. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio: Introduce struct chp_id.Peter Oberparleiter2007-04-27
| | | | | | | | Introduce data type for channel-path IDs. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio/ipl: Clean interface between cio and ipl code.Heiko Carstens2007-04-27
| | | | | | | Clean interface between cio and ipl code, so Peter stops complaining. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio: Fix handling of interrupt for csch().Cornelia Huck2007-04-04
| | | | | | | | | Wipe internal irb if the clear function bit is set before accumulating bits from the irb in order to follow hardware behaviour. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Device status validity.Cornelia Huck2007-03-26
| | | | | | | | Only accumulate device status field in irb if it is valid. Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] cio: qdio slsb setupUrsula Braun2007-03-19
| | | | | | | | Make sure set_slsb problems are handled correctly in qdio_do_qdio_fill_input() and qdio_do_qdio_fill_output. Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [PATCH] sysfs and driver core: add callback helper, used by SCSI and S390Alan Stern2007-03-15
| | | | | | | | | | | | | | | | | | This patch (as868) adds a helper routine for device drivers that need to set up a callback to perform some action in a different process's context. This is intended for use by attribute methods that want to unregister themselves or their parent device. Attribute method calls are mutually exclusive with unregistration, so such actions cannot be taken directly. Two attribute methods are converted to use the new helper routine: one for SCSI device deletion and one for System/390 ccwgroup devices. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Hugh Dickins <hugh@veritas.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Oliver Neukum <oneukum@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [S390] cio: Call cancel_halt_clear even when actl == 0.Cornelia Huck2007-03-05
| | | | | | | | | The subchannel may just be status pending, even with actl == 0. We must go through the cancel_halt_clear procedure to put the subchannel into a defined state. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Use path verification to check for path state.Cornelia Huck2007-03-05
| | | | | | | | | After I/O has been killed by the common I/O layer, trigger path verification which will queue cio_device_nopath_notify itself if it finds a device to be without paths. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Fix locking when calling notify function.Cornelia Huck2007-03-05
| | | | | | | | Make sure we hold the device lock when we modify the ccw device structure but always call the notify function without the lock held. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] nss: Free unused memory in kernel image.Heiko Carstens2007-02-21
| | | | | | | | | | With CONFIG_SHARED_KERNEL the kernel text segment that might be in a read only memory sections starts at 1MB. Memory between 0x12000 and 0x100000 is unused then. Free this, so we have appr. an extra MB of memory available. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] New header file ipl.hMichael Holzheu2007-02-21
| | | | | | | | | Setup.h has been misused for ipl related stuff in the past. We now move everything, which has to do with ipl and reipl to a new header file named "ipl.h". Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds2007-02-12
|\ | | | | | | | | | | | | | | * 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [S390] remove __io_virt and mmiowb. [S390] cio: use ARRAY_SIZE in device_id.c [S390] cio: Fixup interface for setting options on ccw devices. [S390] smp_call_function/smp_call_function_on locking.
| * [S390] cio: use ARRAY_SIZE in device_id.cAhmed S. Darwish2007-02-12
| | | | | | | | | | | | Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: Fixup interface for setting options on ccw devices.Cornelia Huck2007-02-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current ccw_device_set_options() sets a specified mask of options and clears those not specified, but there is no way to find out which options have already been set. In order to fix this up, introduce the following interface changes: ccw_device_set_options() now only sets the specified bits, but does not clear those that are not specified. ccw_device_clear_options() clears the specified bits. ccw_device_set_options_mask() provides the old semantics (setting only the specified bits and clearing the others). Device drivers now work as expected. qdio has been adapted. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | [PATCH] mark struct file_operations const 5Arjan van de Ven2007-02-12
|/ | | | | | | | | | | Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [S390] Avoid excessive inlining.Heiko Carstens2007-02-05
| | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Convert memory detection into C code.Heiko Carstens2007-02-05
| | | | | | | | | | | | | | Hopefully this will make it more maintainable and less error prone. Code makes use of search_exception_tables(). Since it calls this function before the kernel exeception table is sorted, there is an early call to sort_main_extable(). This way it's easy to use the already present infrastructure of fixup sections. Also this would allows to easily convert the rest of head[31|64].S into C code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] ETR support.Martin Schwidefsky2007-02-05
| | | | | | | | | | | | | This patch adds support for clock synchronization to an external time reference (ETR). The external time reference sends an oscillator signal and a synchronization signal every 2^20 microseconds to keep the TOD clocks of all connected servers in sync. For availability two ETR units can be connected to a machine. If the clock deviates for more than the sync-check tolerance all cpus get a machine check that indicates that the clock is out of sync. For the lovely details how to get the clock back in sync see the code below. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Don't spam debug feature.Cornelia Huck2007-02-05
| | | | | | | | Lower priority of "Blacklisted device detected" messages so we don't overwrite more useful messages. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Cleanup of CHSC event handling.Peter Oberparleiter2007-02-05
| | | | | | | Change CHSC event handling to be more easily extensible. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: declare hardware structures packed.Peter Oberparleiter2007-02-05
| | | | | Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Catch operand exceptions on stsch.Cornelia Huck2007-02-05
| | | | | | | | | | If we have a subchannel id which has been generated via for_each_subchannel(), it might contain an invalid subchannel set id. We need to catch the ensuing operand exception by using stsch_err() instead of stsch() in all possible cases. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Use device_{create,remove}_bin_file.Cornelia Huck2007-02-05
| | | | | | | | Create/remove the channel measurement binary files with device_{create,remove}_bin_file instead of sysfs_{create,remove}_bin_file. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Restart path verification after unsolicited interrupt.Cornelia Huck2007-02-05
| | | | | | | | | | If we try to start path verification when an unsolicited interrupt is already pending, stctl shows status pending and we delay path verification again. We need to check for the doverify bit when the unsolicited interrupt comes in and then do path verification. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: Remove check for ssd in chpids_show().Cornelia Huck2007-02-05
| | | | | | | | Since ssd_info is now available before the subchannel is registered, we don't need to check whether it is available. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Get rid of a lot of sparse warnings.Heiko Carstens2007-02-05
| | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: use barrier() in stsch_reset.Heiko Carstens2007-01-09
| | | | | | | | | | | | | Use barrier() in stsch_reset() instead of duplicating the stsch() inline assembly and adding "memory" to the clobberlist. Pointed out by Chuck Ebbert. Real fix would be to add a fixup section to the stsch() and extend the basic program check handler so it searches the exception tables in case of a program check. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: fix stsch_reset.Michael Holzheu2006-12-27
| | | | | | | | | Copy inline assembly of stsch and add "memory" to clobber list in order to prevent gcc from optimizing away the checking of the global variable "pgm_check_occured". Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cio: css_register_subchannel race.Stefan Bader2006-12-15
| | | | | | | | | Asynchronous probe can release memory of a subchannel before css_get_ssd_info is called. To fix this call css_get_ssd_info before registering with driver core. Signed-off-by: Stefan Bader <shbader@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Fix reboot hang on LPARsMichael Holzheu2006-12-15
| | | | | | | | | | | | | | Reboot hangs on LPARs without diag308 support. The reason for this is, that before the reboot is done, the channel subsystem is shut down. During the reset on each possible subchannel a "store subchannel" is done. This operation can end in a program check interruption, if the specified subchannel set is not implemented by the hardware. During the reset, currently we do not have a program check handler, which leads to the described kernel bug. We install now a new program check handler for the reboot code to fix this problem. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Hipersocket multicast queue: make sure outbound handler is calledUrsula Braun2006-12-15
| | | | | | | | | | A HiperSocket multicast queue works asynchronously. When sending buffers, the buffer state change from PRIMED to EMPTY may happen delayed. Reschedule the checking for changes in the outbound queue, if there are still PRIMED buffers. Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Use dev->groups for adding/removing the subchannel attribute group.Cornelia Huck2006-12-08
| | | | | | | Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Support for disconnected devices reappearing on another subchannel.Cornelia Huck2006-12-08
| | | | | | | | | | | - create a 'pseudo_subchannel' per channel subsystem (the 'orphanage') - use the orphanage as a shelter for ccw_devices that can't remain on the same subchannel Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] subchannel lock conversion.Cornelia Huck2006-12-08
| | | | | | | | | | Convert the subchannel lock to a pointer to a lock. Needed for the dynamic subchannel mapping patch. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Some preparations for the dynamic subchannel mapping patch.Cornelia Huck2006-12-08
| | | | | | | | | | | - Move adding subchannel attributes to css_register_subchannel(). - Don't call device_trigger_reprobe() for non-operational devices. - Introduce io_subchannel_create_ccwdev(). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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