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path: root/drivers/s390/cio/chsc.c
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2016-01-26s390/cio: update measurement characteristicsSebastian Ott1-2/+15
Per channel path measurement characteristics are obtained during channel path registration. However if some properties of a channel path change we don't update the measurement characteristics. Make sure to update the characteristics when we change the properties of a channel path or receive a notification from FW about such a change. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-01-26s390/cio: ensure consistent measurement stateSebastian Ott1-4/+8
Make sure that in all cases where we could not obtain measurement characteristics the associated fields are set to invalid values. Note: without this change the "shared" capability of a channel path for which we could not obtain the measurement characteristics was incorrectly displayed as 0 (not shared). We will now correctly report "unknown" in this case. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-01-26s390/cio: fix measurement characteristics memleakSebastian Ott1-14/+2
Measurement characteristics are allocated during channel path registration but not freed during deregistration. Fix this by embedding these characteristics inside struct channel_path. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-11-11s390: add support for ipl devices in subchannel sets > 0Sebastian Ott1-20/+17
Allow to ipl from CCW based devices residing in any subchannel set. Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-07-22s390/cio: Implement proper Link Incident Record handlingPeter Oberparleiter1-42/+123
A hardware problem on a FICON link is reported by the Channel Subsystem to the operating system via a Link Incident Record (LIR). In response, the operating system should issue a message that enables hardware service personnel to identify and repair the failing component. Current Linux LIR handling is broken because LIR data is incorrectly interpreted and no log message is generated. This patch fixes Linux LIR handling by implementing a new log message for LIRs indicating a degraded or non-operational link. Also LIRs are no longer used to deactivate channel paths because the available data does not reliably allow to determine the affected channel path. Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-04-17s390/chsc: fix SEI usage on old FW levelsSebastian Ott1-5/+17
Using a notification type mask for the store event information chsc is unsupported on some firmware levels. Retry SEI with that mask set to zero (which is the old way of requesting only channel subsystem related events). Cc: <stable@vger.kernel.org> Reported-and-tested-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-02-21s390/cio: Fix missing subchannels after CHPID configure onPeter Oberparleiter1-0/+1
Performing a Channel-Path configure on operation on a Channel-Path ID (CHPID) does not trigger a scan for subchannels that might have become available through that CHPID. As a result, some subchannels and associated I/O devices might be missing. Fix this by adding the missing scan. This problem was introduced by commit c820de39, "[S390] cio: Rework css driver.", but wasn't noticed earlier because the machine usually also generates a Channel-Report-Word when the first CHPID of a subchannel is configured on, resulting in a separate scan for that subchannel. The problem only becomes apparent when this first CHPID is not working properly and additional working CHPIDs are subsequently configured on without any effect on the availability of the affected subchannel. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-01-14s390/qdio: bridgeport support - CHSC partEugene Crosser1-0/+33
Introduce function for the "Perform network-subchannel operation" CHSC command with operation code "bridgeport information", and bit definitions for "characteristics" pertaning to this command. Signed-off-by: Eugene Crosser <eugene.crosser@ru.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-12-16s390/cio: More efficient handling of CHPID availability eventsPeter Oberparleiter1-36/+4
The CIO layer processes hardware events that indicate that a channel path has become available by performing a scan of available subchannels using the Store Subchannel (STSCH) instruction. Performing too many STSCH instructions in a tight loop can cause high Hypervisor overhead which can negatively impact the performance of the virtual machine as a whole. This patch reduces the number of STSCH instructions performed while processing a resource accessibility event and while varying a CHPID online. In both cases, Linux first performs a STSCH instruction on each unused subchannel to see if the subchannel has become available. If the STSCH instruction indicates that the subchannel is available, a full evaluation of this subchannel is scheduled. Since the full evaluation includes performing a STSCH instruction, the initial STSCH is unnecessary and can be removed. Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-06-26s390/qdio: cleanup chsc SADC usageSebastian Ott1-0/+37
Move the code to issue the set adapter device controls command to chsc.c and make it accessible for the qdio code via the wrapper chsc_sadc. Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-06-26s390/qdio: cleanup chsc SSQD usageSebastian Ott1-0/+23
Cleanup the function qdio_setup_get_ssqd. Fix some possible memleaks and an unchecked allocation and create a wrapper for SSQD in chsc.c . Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-04-17s390/cio: collect format 1 channel-path description dataPeter Oberparleiter1-5/+6
Collect format 1 channel-path description data for each CHPID and update the information in one place. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-03-07s390/scm: process availabilitySebastian Ott1-0/+17
Let the bus code process scm availability information and notify scm device drivers about the new state. Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-02-14s390/chsc: cleanup SEI helper functionsSebastian Ott1-36/+32
Cleanup the functions used to call SEI. Also provide !CONFIG_PCI dummys for pci error handling. Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-01-16s390/chsc: fix SEI usageSebastian Ott1-19/+12
cbc0dd1 "s390/pci: CHSC PCI support for error and availability events" introduced a new SEI notification type as part of pci support. The way SEI was called with nt2 and nt0 consecutive broke the nt0 stuff used for channel subsystem notifications. The reason why this was broken with the mentioned patch is that you cannot selectively disable type 0 notifications (so even when asked for type 2 only, type 0 could be presented). The way to do it is to tell SEI which types of notification you can process and -this is the important part- look at the SEI result which notification type you actually received. Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-11-30s390/pci: CHSC PCI support for error and availability eventsJan Glauber1-44/+112
Add CHSC store-event-information support for PCI (notfication type 2) and report error and availability events to the PCI architecture layer. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-09-26s390: add scm notificationSebastian Ott1-0/+17
Detect an scm change notification in store event information. Update affected scm devices and notify their drivers. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-09-26s390/chsc: implement store SCM informationSebastian Ott1-0/+35
chsc_scm_info will be used to detect all available increments of storage class memory. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-07-20s390/comments: unify copyright messages and remove file namesHeiko Carstens1-2/+1
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2011-12-01[S390] cio: fix chsc_chp_varySebastian Ott1-5/+2
The functions called by chsc_chp_vary operate on pointers to channel path ids not channel path links. (This worked by chance since the id is the first member of the link structure) Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-05-23[S390] chsc: process channel-path-availability informationSebastian Ott1-1/+34
Update affected channel path descriptors when receiving channel path availability information. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-01-05[S390] cio: obtain mdc value per channel pathSebastian Ott1-0/+19
Add support to accumulate the number of 64K-bytes blocks all paths to a device at least support for a transport command. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-10-25[S390] css: update descriptor after hibernateSebastian Ott1-2/+3
Update the channel path descriptors after hibernation. This is done unlocked, since we are the only active task at this time. Note: chsc_determine_base_channel_path_desc is changed to use spin_lock_irqsave, since it's called with interrupts disabled in this case. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-10-25[S390] cio: update descriptor in chsc_chp_varySebastian Ott1-3/+5
Update the channel path descriptor at the beginning of to the vary_on operation. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-10-25[S390] chsc: use the global page to determine the chp desriptorSebastian Ott1-39/+15
chsc_determine_channel_path_desc is called by a wrapper who allocates a response struct. The response data is then memcpy'ed to this response struct by chsc_determine_channel_path_desc. Change chsc_determine_base_channel_path_desc to use the global chsc_page and deliver it to the function doing the actual chsc call. The channel path desriptor is then directly read from the response data. As a result we get rid of the additional allocation for the response struct. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-10-25[S390] chsc: consolidate memory allocationsSebastian Ott1-114/+112
Most wrappers around the channel subsystem call have their own logic to allocate memory (with proper alignment) or use preallocated or static memory. This patch converts most users of the channel subsystem call to use the same preallocated page (proteced by a spinlock). Note: The sei_page which is used in our crw handler to call "store event information" has to coexist, since a) in crw context, while accessing the sei_page, sleeping is allowed (which will conflict with the spinlock protection of the chsc_page) b) in crw context, while accessing the sei_page, channel subsystem calls are allowed (which itself would require the page). Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-10-25[S390] chsc: initialization fixesSebastian Ott1-6/+6
This patch fixes: * kfree vs. free_page usage * structure definition for determine_css_characteristics * naming convention for the chsc init function * deregistration of crw handlers in the cleanup path Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-08-09[S390] cio: CHSC SIOSL SupportMichael Ernst1-0/+48
A Linux interface for the CHSC command store-I/O-operation-status-and-initiate-logging (SIOSL). Model-dependent logging within the channel subsystem can be invoked via a helper function or a writable subchannel device attribute. Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-07-19[S390] cio: fix potential overflow in chpid descriptorSebastian Ott1-1/+1
The length filed in the chsc response block (if valid) has a value of n*(sizeof(chp_desc))+8 (for the response block header). When we memcopied from the response block to the actual descriptor we copied 8 bytes too much. The bug was not revealed since the descriptor is embedded in struct channel_path. Since we only write one descriptor at a time ignore the length value and use sizeof(*desc). Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-04-22[S390] cio: allow enable_facility from outside init functionsSebastian Ott1-15/+14
Prepare chsc_enable_facility to be used from outside init functions. Use static memory for the chsc call and protect its access by a spinlock (although there is no concurrent usage). Cc: <stable@kernel.org> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-02-26[S390] cio: fix storage key handlingHeiko Carstens1-1/+1
Some parts of cio do not shift PAGE_DEFAULT_KEY correctly and end up with an incorrect key in their data structures. Since the default key is zero this doesn't really matter. However if somebody would use key-controlled protection for debugging purposes it would be quite helpful if all of this would work as expected. Also remove a stale declaration. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-06-16[S390] pm: css bus power management callbacksSebastian Ott1-2/+1
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-03-26[S390] cio: fix rc generation after chsc callSebastian Ott1-0/+1
In some situations a rc in __chsc_do_secm will be overwritten by another one. This shouldn't do harm since todays callers don't check for _specific_ errors but fix it for the sake of correctness. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-03-26[S390] split/move machine check handler codeHeiko Carstens1-3/+3
Split machine check handler code and move it to cio and kernel code where it belongs to. No functional change. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-25[S390] convert cio printks to pr_xxx macros.Michael Ernst1-2/+6
Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-07-17[S390] cio: Export chsc_error_from_response().Cornelia Huck1-1/+8
Make chsc_error_from_response() available to chsc callers outside of chsc.c (namely qdio) to avoid duplicating error checking code. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14[S390] cio: Add chsc subchannel driver.Cornelia Huck1-7/+41
This patch adds a driver for subchannels of type chsc. A device /dev/chsc is created which may be used to issue ioctls to: - obtain information about the machine's I/O configuration - dynamically change the machine's I/O configuration via asynchronous chsc commands Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14[S390] cio: Repair chpid event handling.Cornelia Huck1-24/+31
Passing the affected chpid in chp_event() worked only by chance since chpid is the first element in res_acc_data. Make it work properly by generalizing res_acc_data as chp_link and always passing around a properly filled out chp_link structure in chp_event(). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14[S390] stp support.Martin Schwidefsky1-0/+49
Add support for clock synchronization with the server time protocol. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14[S390] cio: Cleanup crw interface.Cornelia Huck1-4/+21
Eliminate the need for the machine check handler to call into the common I/O layer directly by introducing an interface to register handlers for crws per rsc. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14[S390] cio: Rework css driver.Cornelia Huck1-202/+16
Rework the css driver methods to provide sane callbacks for subchannels of all types. As a bonus, this cleans up and simplyfies the machine check handling for I/O subchannels a lot. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-04-17[S390] cio: fix parallel cm_enable processing.Michael Ernst1-3/+0
It is now possible to trigger cm_enable processing several times in parallel without causing a kernel panic. Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-04-17[S390] cio: Fix race for "fast" path gone/path back situations.Cornelia Huck1-2/+10
Make sure we wait for previous evaluations triggered by path state changes to have settled before we manipulate path states again. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-02-05[S390] cio: Clean up chsc response code handling.Cornelia Huck1-92/+55
This provides unified return codes for common response codes and also makes the debug feature messages more similar and informational. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-01-26[S390] drivers/s390: Add missing "space"Joe Perches1-1/+1
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-01-26[S390] cio: reduce cpu utilization during device scanPeter Oberparleiter1-66/+32
Minimize calls to cpu intensive function get_subchannel_by_schid() by introducing function for_each_subchannel_staged() which temporarily caches the information about registered subchannels in a bitmap. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-01-26[S390] cio: I/O subchannel specific fields.Cornelia Huck1-2/+3
Some fields may be !0 only for I/O subchannels. Add some checks where required. Also adapt cio_enable_subchannel() to make the caller specify the intparm, which makes it more generic. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-01-26[S390] cio: css_driver: Use consistent parameters.Cornelia Huck1-8/+8
Make all callbacks in css_driver take a struct subchannel (and not a struct device). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-07-27[S390] cio: Reorganize initialization.Cornelia Huck1-4/+6
- Localize more of the init calls in init_channel_subsystem(). - Print a warning if init_channel_subsystem() failed. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-07-27[S390] cio: Clean up messages.Cornelia Huck1-8/+8
- Remove unneeded messages. - Move some messages into the debug feature. - Use dev_* where appropriate. - Use "cio: " prefix consistently. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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