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path: root/drivers/s390/block/dasd_eckd.c
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* s390/dasd: fix unaccessible device after resumeStefan Haberland2012-11-30
| | | | | | | | | | | If a channel path is cabled incorrectly and the device is suspended and resumed the device may be inaccessible afterwards. Make the path connection check not interrupt the resume callback there could be other valid paths available. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reference-ID: RQM 1262 Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: fix multi-line printks with multiple KERN_<level>sSebastian Ott2012-11-23
| | | | | | | | Do not use more than one KERN_<level> per printk. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Acked-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: check count address during online settingStefan Haberland2012-09-26
| | | | | | | | | | | | | | | | | | | | | | | | | A common way to prepare a z/VM mini disk is to format the real device with a z/VM tool like CPFMTXA and then define a mini disk that excludes the first cylinder, i.e. the cylinder 0 of the virtual disk is located at cylinder 1 of the real device. The DASD device driver will recognize such a mini disk as formatted, as the uniform record layout on the disk matches that of an LDL formatted device. However, the cylinder value in the 'count' field of the ECKD records matches the geometry of the real device, and not that of the mini disk, so I/O requests will fail with 'record not found' errors. To make the mini disk usable, it needs to be formatted with a tool like dasdfmt. To enable tools like distribution installation tools to recognize this situation, the DASD device driver should report such a mini disk as 'not formatted'. To this end we need to extend the device recognition code to check not just for proper record sizes, but also for proper cylinder/head/record values. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reviewed-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/etr,stp: use -EOPNOTSUPP instead of -ENOSYSHeiko Carstens2012-09-26
| | | | | | | Change -ENOSYS to -EOPNOTSUPP. Return value is used only internally. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: add eadm facility bitsSebastian Ott2012-09-26
| | | | | | | | Add the eadm facility bits to the css characteristics and move them to a new header. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: fix pathgroup raceStefan Haberland2012-09-17
| | | | | | | | | | | | | | | | | | | If a new path is available we need to verify the path data. If it is the first path for a device the stop bits are removed after path verification. If a pathgroup is established we need to set system characteristics for the lcu. Therefore I/O has to be started. If the device is stopped the set system characteristics worker may block the path verification worker and the device is blocked. Turn on failfast for set system characteristics CQR to prevent a deadlock with the path verification worker. If a pathgroup is established on a device that is not in use trigger path verification. Maybe we were not informed about a working path. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reviewed-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/dasd: fix ioctl return valueHeiko Carstens2012-08-28
| | | | | | | | | For unimplemented ioctls the dasd driver should return -ENOTTY. Reported-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Acked-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/comments: unify copyright messages and remove file namesHeiko Carstens2012-07-20
| | | | | | | | | | | | | | 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>
* s390/dasd: add shutdown actionStefan Haberland2012-07-16
| | | | | | | | | | Add a mechanism to wait for outstanding IO during shutdown. Schedule the block_bh and device_bh and wait until our request queues are empty. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] drivers/s390/block/dasd_eckd.c: add missing dasd_sfree_requestJulia Lawall2012-04-11
| | | | | | | | Extend some error paths to call dasd_sfree_request as done earlier in the function. The error-handling code is also moved to the end of the function. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: prevent validate server for offline devicesStefan Haberland2012-03-11
| | | | | | | | | Calling validate server on devices in offline processing may cause an OOPS in the dasd_sleep_on function. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Reviewed-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* compat: fix compile breakage on s390Heiko Carstens2012-02-27
| | | | | | | | | | | The new is_compat_task() define for the !COMPAT case in include/linux/compat.h conflicts with a similar define in arch/s390/include/asm/compat.h. This is the minimal patch which fixes the build issues. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [S390] dasd: revalidate server for new pathgroupStefan Haberland2012-01-18
| | | | | | | | If a pathgroup is established we get an event and have to revalidate the server to propagate supported features like PAV and enable them. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: revert LCU optimizationStefan Haberland2012-01-18
| | | | | | | | | | | | Remove the optimization that validate server is only called once per LCU. If a device is set online we only know that we already know the LCU. But if the pathgroup was lost in between we have to do a validate server again to activate some features. Since we have no indication when a pathgroup gets lost we have to do a validate server every time a device is set online. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: fix fixpoint divide exception in define_extentStefan Haberland2011-12-27
| | | | | | | | | | | | If an IO request is build on an alias device without prefix enabled we try to calculate with zero data from the alias device. This triggers a BUG statement with fixpoint divide exception. This case is very unlikely and can only happen if the pathgroup is lost with an alias device already in use. Prevent the alias device from being used in this case. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: add sanity check to detect path connection errorStefan Haberland2011-12-27
| | | | | | | | Prevents possible data corruption by detecting cabling error. Therefor read and compare the UID for all available channel paths. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] sparse: fix sparse NULL pointer warningsMartin Schwidefsky2011-10-30
| | | | | | | | | Fix two NULL pointer warnings in the dasd driver: drivers/s390/block/dasd_eckd.c:2353:20: warning: Using plain integer as NULL pointer drivers/s390/block/dasd_eckd.c:2415:44: warning: Using plain integer as NULL pointer Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: prevent path verification before resumeStefan Haberland2011-10-30
| | | | | | | | Mark the device as suspended and delay execution of the path verification worker to prevent mix-up. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: re-initialize read_conf buffer for retriesStefan Haberland2011-10-30
| | | | | | | | | | | The buffer for read configuration data has to be initialized with an EBCDIC string to show support for extended UIDs to z/VM. If this read configuration data CQR needs to be retried, the buffer may have changed in between. So re-initialize the buffer to get a correct extended UID under z/VM. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] fix mismatch in summation of I/O IRQ statisticsPeter Oberparleiter2011-10-30
| | | | | | | | | | | | | | | | | | | | | | | | | | Current IRQ statistics support does not show detail counts for I/O interrupts which are processed internally only. The result is a summation count which is way off such as this one: CPU0 CPU1 CPU2 I/O: 1331 710 442 [...] QAI: 15 16 16 [I/O] QDIO Adapter Interrupt QDI: 1 0 0 [I/O] QDIO Interrupt DAS: 706 645 381 [I/O] DASD C15: 26 10 0 [I/O] 3215 C70: 0 0 0 [I/O] 3270 TAP: 0 0 0 [I/O] Tape VMR: 0 0 0 [I/O] Unit Record Devices LCS: 0 0 0 [I/O] LCS CLW: 0 0 0 [I/O] CLAW CTC: 0 0 0 [I/O] CTC APB: 0 0 0 [I/O] AP Bus Fix this by moving I/O interrupt accounting into the common I/O layer. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: check if raw track access is supportedStefan Haberland2011-08-03
| | | | | | | | | | | To use raw track access some special storage server commands are needed. Older storage hardware may not support these commands. So check if raw track access is possible while setting the DASD online. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] dasd: fix return code handlingHeiko Carstens2011-05-23
| | | | | | | Check return value of itcw_add_dcw() for error code and return it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] get rid of unused variablesHeiko Carstens2011-05-23
| | | | | | | Remove trivially unused variables as detected with -Wunused-but-set-variable. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: check sense type in device change handlerStefan Weinhuber2011-04-20
| | | | | | | | | When evaluating sense data in dasd_eckd_check_for_device_change, we must always check for the type of sense data in byte 27, bit 0, to make sure that the rest of the sense data is interpreted correctly. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Fix common misspellingsLucas De Marchi2011-03-31
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* [S390] ccw_driver: remove duplicate membersSebastian Ott2011-03-23
| | | | | | | | | Remove the owner and name members of struct ccw_driver and convert all drivers to store this data in the embedded struct device_driver. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: get rid of compile warningHeiko Carstens2011-03-15
| | | | | | | | | | Get rid of this: drivers/s390/block/dasd_eckd.c: In function 'dasd_eckd_build_cp_tpm_track.clone.8': drivers/s390/block/dasd_eckd.c:2589:34: warning: 'len_to_track_end' may be used uninitialized in this function Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: correct device tableStefan Haberland2011-02-17
| | | | | | | | | The 3880 storage control unit supports a 3380 device type, but not a 3390 device type. Reported-by: Stephen Powell <zlinuxman@wowway.com> Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: Add support for raw ECKD access.Stefan Haberland2011-01-05
| | | | | | | | | | Normal I/O operations through the DASD device driver give only access to the data fields of an ECKD device even for track based I/O. This patch extends the DASD device driver to give access to whole ECKD tracks including count, key and data fields. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: Improve handling of stolen DASD reservationStefan Weinhuber2011-01-05
| | | | | | | | | | | | If a DASD device has been reserved by a Linux system, and later this reservation is ‘stolen’ by a second system by means of an unconditional reserve, then the first system receives a notification about this fact. With this patch such an event can be either ignored, as before, or it can be used to let the device fail all I/O request, so that the device will not block anymore. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: do path verification for paths added at runtimeStefan Weinhuber2011-01-05
| | | | | | | | | | When a new path is added at runtime, the CIO layer will call the drivers path_event callback. The DASD device driver uses this callback to trigger a path verification for the new path. The driver will use only those paths for I/O, which have been successfully verified. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: add High Performance FICON multitrack supportStefan Weinhuber2011-01-05
| | | | | | | | | | Some storage systems support multitrack High Performance FICON requests, which read or write data to more than one track. This patch enables the DASD device driver to generate multitrack High Performance FICON requests. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: provide a Sense Path Group ID ioctlStefan Weinhuber2010-10-29
| | | | | | | | | | The BIODASDSNID ioctl executes a 'Sense Path Group ID' command on a DASD ECKD device. The returned path group data allows user space programs to determine path state and path group ID of the channel paths to the device. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: fix unsolicited interrupt recognitionStefan Weinhuber2010-10-25
| | | | | | | | | | | | | | | The dasd interrupt handler needs to distinguish solicited from unsolicited interrupts, as unsolicited interrupts may require special handling (e.g. summary unit checks) and solicited interrupts require proper error recovery for the failed I/O request. The interrupt handler needs to check several bit fields in the interrupt response block (irb) to make this distinction. So far our check of the status control bits has not been specific enough, which may lead to a failed request getting just retried instead of the necessary error recovery. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd fix dump_sense_dbfStefan Haberland2010-10-25
| | | | | | | | | | The dasd_eckd_dump_sense_dbf function uses a macro for s390 debug feature that can handle up to 8 parameters (for the DASD device driver). Fix the function to use only the maximum number of parameters. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Fix various typos of valid in commentsNikanth Karthikesan2010-09-21
| | | | | | | Fix various typos of valid. Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* [S390] dasd: tunable missing interrupt handlerStefan Haberland2010-08-09
| | | | | | | | This feature provides a user interface to specify the timeout for missing interrupts for standard I/O operations. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: allocate fallback cqr for reserve/releaseStefan Weinhuber2010-08-09
| | | | | | | | | | | | | | | The DASD reserve and release ioctls use the preallocated memory pool of the respective device to build their CCW requests. However, when the device is busy, the pool may already be empty and the ioctl fails. Usually this can be recovered by calling the ioctl again, but in a situation in which we need to issue an unconditional reserve to make a device operational again, this would be not recoverable. To avoid a failure due to lack of memory, DASD device driver will preallocate enough memory for a single reserve/release request, which can be used if normal allocation fails. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: unit check handling during internal cio I/OStefan Haberland2010-05-26
| | | | | | | | React on unit checks during cio internal I/O. Handle as unsolicited interrupt and advice cio to retry. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: remove uid from devmapStefan Haberland2010-05-17
| | | | | | | | | | | Remove the duplicate of the DASD uid from the devmap structure. Use the uid from the device private structure instead. This also removes a lockdep warning complaining about a possible SOFTIRQ-safe -> SOFTIRQ-unsafe lock order. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: add dynamic pav tolerationStefan Haberland2010-05-17
| | | | | | | | | | | | For base Parallel Access Volume (PAV) there is a fixed mapping of base and alias devices. With dynamic PAV this mapping can be changed so that an alias device is used with another base device. This patch enables the DASD device driver to tolerate dynamic PAV changes. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: check tsb validityStefan Haberland2010-03-24
| | | | | | | Check tsb validity before the tcw_get_tsb function is called. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: automatic recognition of read-only devicesStefan Weinhuber2010-03-08
| | | | | | | | | | In z/VM it is possible to attach a device as read-only. To prevent unintentional write requests and subsequent I/O errors, we can detect this configuration using the z/VM DIAG 210 interface and set the respective linux block device to read-only as well. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: security and PSF update patch for EMC CKD ioctlNigel Hislop2010-03-08
| | | | | | | | Remove the PSF order/suborder check from the Symmetrix CKD dasd ioctl. In exchange restrict the ioctl to CAP_SYS_ADMIN and CAP_SYS_RAWIO. Signed-off-by: Nigel Hislop <hislop_nigel@emc.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: fix possible NULL pointer errorsStefan Haberland2010-01-27
| | | | | | | | Fix possible NULL pointer in DASD messages and correct discipline checking. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: add proper compat pointer conversion for symmetrix ioctlHeiko Carstens2010-01-13
| | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: let device initialization wait for LCU setupStefan Weinhuber2009-12-07
| | | | | | | | | | | | The first DASD that is set online for a specific logical control unit has to do certain setup steps on the storage server to make full use of it, for example it will enable PAV. The features and characteristics reported by the storage server will depend on this setup, so all other devices on the same LCU will need to wait for the setup to be finished. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: remove strings from s390dbfStefan Haberland2009-12-07
| | | | | | | | | Remove strings from s390 debugfeature entries that could lead to a crash when the data is read from dbf because the strings do not exist any more. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: improve error recovery for internal I/OStefan Weinhuber2009-12-07
| | | | | | | | | | | | | | | | | | | Most of the error conditions reported by a FICON storage server indicate situations which can be recovered. Sometimes the host just needs to retry an I/O request, but sometimes the recovery is more complex and requires the device driver to wait, choose a different path, etc. The DASD device driver has a fully featured error recovery for normal block layer I/O, but not for internal I/O request which are for example used during the device bring up. This can lead to situations where the IPL of a system fails because DASD devices are not properly recognized. This patch will extend the internal I/O handling to use the existing error recovery procedures. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] dasd: enable prefix independent of pav supportStefan Weinhuber2009-12-07
| | | | | | | | | | | The DASD device driver needs to explicitly enable the prefix command on the storage server, before it can be used. Originally we enabled this command along with others only if we wanted to support PAV. However, today we require this command for other features like High Performance FICON as well, so we need to always enable prefix. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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