Make sure the early sclp code does not generate any sclp requests
anymore as soon as the base sclp driver is active. Otherwise both
drivers may see unexpected requests or may miss expected interrupts.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Move the early sclp printk code to the drivers folder where also the
rest of the sclp code can be found. This way it is possible to use the
sclp private header files for further cleanups.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
With multiple input queues, these DBFs turned out to be not
very helpful...
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
In tiqdio_call_inq_handlers(), we're looping over all
input queues on the *same* irq. So instead of using the
queues' back pointer, we can just access the irq directly.
No functional change.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
For devices with multiple input queues, tiqdio_call_inq_handlers()
iterates over all input queues and clears the device's DSCI
during each iteration. If the DSCI is re-armed during one
of the later iterations, we therefore do not scan the previous
queues again.
The re-arming also raises a new adapter interrupt. But its
handler does not trigger a rescan for the device, as the DSCI
has already been erroneously cleared.
This can result in queue stalls on devices with multiple
input queues.
Fix it by clearing the DSCI just once, prior to scanning the queues.
As the code is moved in front of the loop, we also need to access
the DSCI directly (ie irq->dsci) instead of going via each queue's
parent pointer to the same irq. This is not a functional change,
and a follow-up patch will clean up the other users.
In practice, this bug only affects CQ-enabled HiperSockets devices,
ie. devices with sysfs-attribute "hsuid" set. Setting a hsuid is
needed for AF_IUCV socket applications that use HiperSockets
communication.
Fixes: 104ea556ee ("qdio: support asynchronous delivery of storage blocks")
Cc: <stable@vger.kernel.org> # v3.2+
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Since commit dd22f551 "block: Change direct_access calling convention",
the device size calculation in dcssblk_direct_access() is off-by-one.
This results in bdev_direct_access() always returning -ENXIO because the
returned value is not page aligned.
Fix this by adding 1 to the dev_sz calculation.
Fixes: dd22f551 ("block: Change direct_access calling convention")
Cc: <stable@vger.kernel.org> # 4.0+
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
If safe offline is called for a DASD alias device a null pointer is passed
to fsync_bdev. So check for existence of the blockdevice before calling
fsync_bdev.
Should not be a real world problem since safe offline for an alias device
does not make sense and fsync_bdev can deal with a NULL pointer which it
gets after successful NULL pointer dereferencing on s390.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Check if the device pointer is valid. Just a sanity check since we already
are in the int handler of the device.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Allow 0 as valid input for the path_threshold attribute to deactivate
the IFCC/CCC error handling.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The function dasd_busid() still uses simple_strtoul() to convert a
string to an integer value. This function is obsolete for quite some
time already and should be replaced.
The whole parameter parsing semantic still relies somewhat on the fact,
that simple_strtoul() parses a string containing literals without
complains and just returns the parsed integer value plus the residual
string. kstrtoint(), however, would return -EINVAL in such a case.
Since we want to get rid of simple_strtoul() and now have a nice dasd[]
containing only single elements, we can clean up and simplify a few
things.
Replace simple_strtoul() with kstrtouint(), improve and simplify the
overall parameter parsing by the following:
- instead of residual strings return proper error codes
- remove dasd_parse_next_element() and decide directly what sort of
element is being parsed
- if we parse a device or a range of devices, split that element into
separate bits with a new function
- remove warning about invalid ending as it doesn't apply anymore
- annotate all parsing functions and data that can be freed after
initialisation with __init and __initdata respectively
- clean up bits and pieces while at it
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
When the DASD driver is built into the kernel, the entire comma
separated parameter list is stored as one single element in the dasd[]
array, opposed to the module build where each element is stored
separately in dasd[].
There is no point in doing so. Therefore, store each part of the list as
single elements in dasd[] as well when built into the kernel.
Also, create a define for the maximum of 256 parameters.
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
During tests the Kernel complained about inconsistend lock state:
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
Now all the queue locks use spin_lock_bh/spin_unlock_bh.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This is a leftover from the 31 bit era to avoid 64 bit divisions.
Get rid of it.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Yet another trivial patch to reduce the noise that coccinelle
generates.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Keep sparse and other static code checkers from emitting warnings like:
arch/s390/kernel/ipl.c:1549:14: warning: incorrect type in assignment (different base types)
arch/s390/kernel/ipl.c:1549:14: expected unsigned int [unsigned] csum
arch/s390/kernel/ipl.c:1549:14: got restricted __wsum
All usages in s390 code are ok. Therefore add proper casts.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
drivers/s390/char/zcore.c does not contain any miscdevice so the
inclusion of linux/miscdevice.h is uncessary.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Remove an unused member of struct channel subsystem.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Simplify error handling during css initialization by moving the error
handling code to setup_css (which now cleans up after itself).
Also remove the odd special cleanup handling of the pseudo_subchannel.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cleanup the code to handle the css device attribute. Move everything
to an attribute group to let the driver core handle attribute
creation and removal.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Obtain the real channel subsystem id and use that for the generation
of a unique path group id. Note that this change does not affect the
channel subsystem id as used in the user-visible naming of subchannels
and friends.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshik@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Currently the cssid in various structures is used as the id of
the respective channel subsystem. Sometimes however we call the
index in the channel_subsystems array cssid. In some places the
id is even used as the index.
Provide a new define MAX_CSS_IDX and use it where appropriate.
In addition to that provide a dummy function to find a channel
subsystem by its id and a macro to iterate over the channel
subsystems.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The variable length arrays used to specify clobbered memory within
ap_nqap and ap_dqap would only work if the length would be known at
compile time.
This is not the case for both usages. Therefore simply use a full
memory clobber and get rid of the old construct.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Get rid of these:
drivers/s390/crypto/ap_card.c:140:20:
warning: symbol 'ap_card_type' was not declared. Should it be static?
drivers/s390/crypto/ap_queue.c:567:20:
warning: symbol 'ap_queue_type' was not declared. Should it be static?
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Use a flexible array instead. The size of the structure is not used
within chsc_sstpi, therefore no change in semantics but one less
sparse warning:
drivers/s390/cio/chsc.c:1219:27: warning: Variable length array is used.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
ktime_set(S,N) was required for the timespec storage type and is still
useful for situations where a Seconds and Nanoseconds part of a time value
needs to be converted. For anything where the Seconds argument is 0, this
is pointless and can be replaced with a simple assignment.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
This was entirely automated, using the script by Al:
PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>'
sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \
$(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)
to do the replacement at the end of the merge window.
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is mostly stuff which missed the initial pull. There's a new
driver: qedi, some ufs, ibmvscsis and ncr5380 updates plus some
assorted driver fixes and also a fix for the bug where if a device
goes into a blocked state between configuration and sysfs device add
(which can be a long time under async probing) it would become
permanently blocked.
Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2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=Zofc
-----END PGP SIGNATURE-----
Merge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull late SCSI updates from James Bottomley:
"This is mostly stuff which missed the initial pull.
There's a new driver: qedi, and some ufs, ibmvscsis and ncr5380
updates plus some assorted driver fixes and also a fix for the bug
where if a device goes into a blocked state between configuration and
sysfs device add (which can be a long time under async probing) it
would become permanently blocked"
* tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (30 commits)
scsi: avoid a permanent stop of the scsi device's request queue
scsi: mpt3sas: Recognize and act on iopriority info
scsi: qla2xxx: Fix Target mode handling with Multiqueue changes.
scsi: qla2xxx: Add Block Multi Queue functionality.
scsi: qla2xxx: Add multiple queue pair functionality.
scsi: qla2xxx: Utilize pci_alloc_irq_vectors/pci_free_irq_vectors calls.
scsi: qla2xxx: Only allow operational MBX to proceed during RESET.
scsi: hpsa: remove memory allocate failure message
scsi: Update 3ware driver email addresses
scsi: zfcp: fix rport unblock race with LUN recovery
scsi: zfcp: do not trace pure benign residual HBA responses at default level
scsi: zfcp: fix use-after-"free" in FC ingress path after TMF
scsi: libcxgbi: return error if interface is not up
scsi: cxgb4i: libcxgbi: add missing module_put()
scsi: cxgb4i: libcxgbi: cxgb4: add T6 iSCSI completion feature
scsi: cxgb4i: libcxgbi: add active open cmd for T6 adapters
scsi: cxgb4i: use cxgb4_tp_smt_idx() to get smt_idx
scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.
scsi: aacraid: remove wildcard for series 9 controllers
scsi: ibmvscsi: add write memory barrier to CRQ processing
...
Pull m ore s390 updates from Martin Schwidefsky:
"Over 95% of the changes in this pull request are related to the zcrypt
driver. There are five improvements for zcrypt: the ID for the CEX6
cards is added, workload balancing and multi-domain support are
introduced, the debug logs are overhauled and a set of tracepoints is
added.
Then there are several patches in regard to inline assemblies. One
compile fix and several missing memory clobbers. As far as we can tell
the omitted memory clobbers have not caused any breakage.
A small change to the PCI arch code, the machine can tells us how big
the function measurement blocks are. The PCI function measurement will
be disabled for a device if the queried length is larger than the
allocated size for these blocks.
And two more patches to correct five printk messages.
That is it for s390 in regard to the 4.10 merge window. Happy holidays"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (23 commits)
s390/pci: query fmb length
s390/zcrypt: add missing memory clobber to ap_qci inline assembly
s390/extmem: add missing memory clobber to dcss_set_subcodes
s390/nmi: fix inline assembly constraints
s390/lib: add missing memory barriers to string inline assemblies
s390/cpumf: fix qsi inline assembly
s390/setup: reword printk messages
s390/dasd: fix typos in DASD error messages
s390: fix compile error with memmove_early() inline assembly
s390/zcrypt: tracepoint definitions for zcrypt device driver.
s390/zcrypt: Rework debug feature invocations.
s390/zcrypt: Improved invalid domain response handling.
s390/zcrypt: Fix ap_max_domain_id for older machine types
s390/zcrypt: Correct function bits for CEX2x and CEX3x cards.
s390/zcrypt: Fixed attrition of AP adapters and domains
s390/zcrypt: Introduce new zcrypt device status API
s390/zcrypt: add multi domain support
s390/zcrypt: Introduce workload balancing
s390/zcrypt: get rid of ap_poll_requests
s390/zcrypt: header for the AP inline assmblies
...
It is unavoidable that zfcp_scsi_queuecommand() has to finish requests
with DID_IMM_RETRY (like fc_remote_port_chkready()) during the time
window when zfcp detected an unavailable rport but
fc_remote_port_delete(), which is asynchronous via
zfcp_scsi_schedule_rport_block(), has not yet blocked the rport.
However, for the case when the rport becomes available again, we should
prevent unblocking the rport too early. In contrast to other FCP LLDDs,
zfcp has to open each LUN with the FCP channel hardware before it can
send I/O to a LUN. So if a port already has LUNs attached and we
unblock the rport just after port recovery, recoveries of LUNs behind
this port can still be pending which in turn force
zfcp_scsi_queuecommand() to unnecessarily finish requests with
DID_IMM_RETRY.
This also opens a time window with unblocked rport (until the followup
LUN reopen recovery has finished). If a scsi_cmnd timeout occurs during
this time window fc_timed_out() cannot work as desired and such command
would indeed time out and trigger scsi_eh. This prevents a clean and
timely path failover. This should not happen if the path issue can be
recovered on FC transport layer such as path issues involving RSCNs.
Fix this by only calling zfcp_scsi_schedule_rport_register(), to
asynchronously trigger fc_remote_port_add(), after all LUN recoveries as
children of the rport have finished and no new recoveries of equal or
higher order were triggered meanwhile. Finished intentionally includes
any recovery result no matter if successful or failed (still unblock
rport so other successful LUNs work). For simplicity, we check after
each finished LUN recovery if there is another LUN recovery pending on
the same port and then do nothing. We handle the special case of a
successful recovery of a port without LUN children the same way without
changing this case's semantics.
For debugging we introduce 2 new trace records written if the rport
unblock attempt was aborted due to still unfinished or freshly triggered
recovery. The records are only written above the default trace level.
Benjamin noticed the important special case of new recovery that can be
triggered between having given up the erp_lock and before calling
zfcp_erp_action_cleanup() within zfcp_erp_strategy(). We must avoid the
following sequence:
ERP thread rport_work other context
------------------------- -------------- --------------------------------
port is unblocked, rport still blocked,
due to pending/running ERP action,
so ((port->status & ...UNBLOCK) != 0)
and (port->rport == NULL)
unlock ERP
zfcp_erp_action_cleanup()
case ZFCP_ERP_ACTION_REOPEN_LUN:
zfcp_erp_try_rport_unblock()
((status & ...UNBLOCK) != 0) [OLD!]
zfcp_erp_port_reopen()
lock ERP
zfcp_erp_port_block()
port->status clear ...UNBLOCK
unlock ERP
zfcp_scsi_schedule_rport_block()
port->rport_task = RPORT_DEL
queue_work(rport_work)
zfcp_scsi_rport_work()
(port->rport_task != RPORT_ADD)
port->rport_task = RPORT_NONE
zfcp_scsi_rport_block()
if (!port->rport) return
zfcp_scsi_schedule_rport_register()
port->rport_task = RPORT_ADD
queue_work(rport_work)
zfcp_scsi_rport_work()
(port->rport_task == RPORT_ADD)
port->rport_task = RPORT_NONE
zfcp_scsi_rport_register()
(port->rport == NULL)
rport = fc_remote_port_add()
port->rport = rport;
Now the rport was erroneously unblocked while the zfcp_port is blocked.
This is another situation we want to avoid due to scsi_eh
potential. This state would at least remain until the new recovery from
the other context finished successfully, or potentially forever if it
failed. In order to close this race, we take the erp_lock inside
zfcp_erp_try_rport_unblock() when checking the status of zfcp_port or
LUN. With that, the possible corresponding rport state sequences would
be: (unblock[ERP thread],block[other context]) if the ERP thread gets
erp_lock first and still sees ((port->status & ...UNBLOCK) != 0),
(block[other context],NOP[ERP thread]) if the ERP thread gets erp_lock
after the other context has already cleard ...UNBLOCK from port->status.
Since checking fields of struct erp_action is unsafe because they could
have been overwritten (re-used for new recovery) meanwhile, we only
check status of zfcp_port and LUN since these are only changed under
erp_lock elsewhere. Regarding the check of the proper status flags (port
or port_forced are similar to the shown adapter recovery):
[zfcp_erp_adapter_shutdown()]
zfcp_erp_adapter_reopen()
zfcp_erp_adapter_block()
* clear UNBLOCK ---------------------------------------+
zfcp_scsi_schedule_rports_block() |
write_lock_irqsave(&adapter->erp_lock, flags);-------+ |
zfcp_erp_action_enqueue() | |
zfcp_erp_setup_act() | |
* set ERP_INUSE -----------------------------------|--|--+
write_unlock_irqrestore(&adapter->erp_lock, flags);--+ | |
.context-switch. | |
zfcp_erp_thread() | |
zfcp_erp_strategy() | |
write_lock_irqsave(&adapter->erp_lock, flags);------+ | |
... | | |
zfcp_erp_strategy_check_target() | | |
zfcp_erp_strategy_check_adapter() | | |
zfcp_erp_adapter_unblock() | | |
* set UNBLOCK -----------------------------------|--+ |
zfcp_erp_action_dequeue() | |
* clear ERP_INUSE ---------------------------------|-----+
... |
write_unlock_irqrestore(&adapter->erp_lock, flags);-+
Hence, we should check for both UNBLOCK and ERP_INUSE because they are
interleaved. Also we need to explicitly check ERP_FAILED for the link
down case which currently does not clear the UNBLOCK flag in
zfcp_fsf_link_down_info_eval().
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Fixes: 8830271c48 ("[SCSI] zfcp: Dont fail SCSI commands when transitioning to blocked fc_rport")
Fixes: a2fa0aede0 ("[SCSI] zfcp: Block FC transport rports early on errors")
Fixes: 5f852be9e1 ("[SCSI] zfcp: Fix deadlock between zfcp ERP and SCSI")
Fixes: 338151e066 ("[SCSI] zfcp: make use of fc_remote_port_delete when target port is unavailable")
Fixes: 3859f6a248 ("[PATCH] zfcp: add rports to enable scsi_add_device to work again")
Cc: <stable@vger.kernel.org> #2.6.32+
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Since quite a while, Linux issues enough SCSI commands per scsi_device
which successfully return with FCP_RESID_UNDER, FSF_FCP_RSP_AVAILABLE,
and SAM_STAT_GOOD. This floods the HBA trace area and we cannot see
other and important HBA trace records long enough.
Therefore, do not trace HBA response errors for pure benign residual
under counts at the default trace level.
This excludes benign residual under count combined with other validity
bits set in FCP_RSP_IU, such as FCP_SNS_LEN_VAL. For all those other
cases, we still do want to see both the HBA record and the corresponding
SCSI record by default.
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Fixes: a54ca0f62f ("[SCSI] zfcp: Redesign of the debug tracing for HBA records.")
Cc: <stable@vger.kernel.org> #2.6.37+
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
When SCSI EH invokes zFCP's callbacks for eh_device_reset_handler() and
eh_target_reset_handler(), it expects us to relent the ownership over
the given scsi_cmnd and all other scsi_cmnds within the same scope - LUN
or target - when returning with SUCCESS from the callback ('release'
them). SCSI EH can then reuse those commands.
We did not follow this rule to release commands upon SUCCESS; and if
later a reply arrived for one of those supposed to be released commands,
we would still make use of the scsi_cmnd in our ingress tasklet. This
will at least result in undefined behavior or a kernel panic because of
a wrong kernel pointer dereference.
To fix this, we NULLify all pointers to scsi_cmnds (struct zfcp_fsf_req
*)->data in the matching scope if a TMF was successful. This is done
under the locks (struct zfcp_adapter *)->abort_lock and (struct
zfcp_reqlist *)->lock to prevent the requests from being removed from
the request-hashtable, and the ingress tasklet from making use of the
scsi_cmnd-pointer in zfcp_fsf_fcp_cmnd_handler().
For cases where a reply arrives during SCSI EH, but before we get a
chance to NULLify the pointer - but before we return from the callback
-, we assume that the code is protected from races via the CAS operation
in blk_complete_request() that is called in scsi_done().
The following stacktrace shows an example for a crash resulting from the
previous behavior:
Unable to handle kernel pointer dereference at virtual kernel address fffffee17a672000
Oops: 0038 [#1] SMP
CPU: 2 PID: 0 Comm: swapper/2 Not tainted
task: 00000003f7ff5be0 ti: 00000003f3d38000 task.ti: 00000003f3d38000
Krnl PSW : 0404d00180000000 00000000001156b0 (smp_vcpu_scheduled+0x18/0x40)
R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 EA:3
Krnl GPRS: 000000200000007e 0000000000000000 fffffee17a671fd8 0000000300000015
ffffffff80000000 00000000005dfde8 07000003f7f80e00 000000004fa4e800
000000036ce8d8f8 000000036ce8d9c0 00000003ece8fe00 ffffffff969c9e93
00000003fffffffd 000000036ce8da10 00000000003bf134 00000003f3b07918
Krnl Code: 00000000001156a2: a7190000 lghi %r1,0
00000000001156a6: a7380015 lhi %r3,21
#00000000001156aa: e32050000008 ag %r2,0(%r5)
>00000000001156b0: 482022b0 lh %r2,688(%r2)
00000000001156b4: ae123000 sigp %r1,%r2,0(%r3)
00000000001156b8: b2220020 ipm %r2
00000000001156bc: 8820001c srl %r2,28
00000000001156c0: c02700000001 xilf %r2,1
Call Trace:
([<0000000000000000>] 0x0)
[<000003ff807bdb8e>] zfcp_fsf_fcp_cmnd_handler+0x3de/0x490 [zfcp]
[<000003ff807be30a>] zfcp_fsf_req_complete+0x252/0x800 [zfcp]
[<000003ff807c0a48>] zfcp_fsf_reqid_check+0xe8/0x190 [zfcp]
[<000003ff807c194e>] zfcp_qdio_int_resp+0x66/0x188 [zfcp]
[<000003ff80440c64>] qdio_kick_handler+0xdc/0x310 [qdio]
[<000003ff804463d0>] __tiqdio_inbound_processing+0xf8/0xcd8 [qdio]
[<0000000000141fd4>] tasklet_action+0x9c/0x170
[<0000000000141550>] __do_softirq+0xe8/0x258
[<000000000010ce0a>] do_softirq+0xba/0xc0
[<000000000014187c>] irq_exit+0xc4/0xe8
[<000000000046b526>] do_IRQ+0x146/0x1d8
[<00000000005d6a3c>] io_return+0x0/0x8
[<00000000005d6422>] vtime_stop_cpu+0x4a/0xa0
([<0000000000000000>] 0x0)
[<0000000000103d8a>] arch_cpu_idle+0xa2/0xb0
[<0000000000197f94>] cpu_startup_entry+0x13c/0x1f8
[<0000000000114782>] smp_start_secondary+0xda/0xe8
[<00000000005d6efe>] restart_int_handler+0x56/0x6c
[<0000000000000000>] 0x0
Last Breaking-Event-Address:
[<00000000003bf12e>] arch_spin_lock_wait+0x56/0xb0
Suggested-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Fixes: ea127f9754 ("[PATCH] s390 (7/7): zfcp host adapter.") (tglx/history.git)
Cc: <stable@vger.kernel.org> #2.6.32+
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This update includes the usual round of major driver updates (ncr5380,
lpfc, hisi_sas, megaraid_sas, ufs, ibmvscsis, mpt3sas). There's also
an assortment of minor fixes, mostly in error legs or other not very
user visible stuff. The major change is the pci_alloc_irq_vectors
replacement for the old pci_msix_.. calls; this effectively makes IRQ
mapping generic for the drivers and allows blk_mq to use the
information.
Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2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=sPXh
-----END PGP SIGNATURE-----
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI updates from James Bottomley:
"This update includes the usual round of major driver updates (ncr5380,
lpfc, hisi_sas, megaraid_sas, ufs, ibmvscsis, mpt3sas).
There's also an assortment of minor fixes, mostly in error legs or
other not very user visible stuff. The major change is the
pci_alloc_irq_vectors replacement for the old pci_msix_.. calls; this
effectively makes IRQ mapping generic for the drivers and allows
blk_mq to use the information"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (256 commits)
scsi: qla4xxx: switch to pci_alloc_irq_vectors
scsi: hisi_sas: support deferred probe for v2 hw
scsi: megaraid_sas: switch to pci_alloc_irq_vectors
scsi: scsi_devinfo: remove synchronous ALUA for NETAPP devices
scsi: be2iscsi: set errno on error path
scsi: be2iscsi: set errno on error path
scsi: hpsa: fallback to use legacy REPORT PHYS command
scsi: scsi_dh_alua: Fix RCU annotations
scsi: hpsa: use %phN for short hex dumps
scsi: hisi_sas: fix free'ing in probe and remove
scsi: isci: switch to pci_alloc_irq_vectors
scsi: ipr: Fix runaway IRQs when falling back from MSI to LSI
scsi: dpt_i2o: double free on error path
scsi: cxlflash: Migrate scsi command pointer to AFU command
scsi: cxlflash: Migrate IOARRIN specific routines to function pointers
scsi: cxlflash: Cleanup queuecommand()
scsi: cxlflash: Cleanup send_tmf()
scsi: cxlflash: Remove AFU command lock
scsi: cxlflash: Wait for active AFU commands to timeout upon tear down
scsi: cxlflash: Remove private command pool
...
The ap_qci() inline assembly writes to memory (*config) but misses to
tell the compiler about it. Add the missing memory clobber to fix
this.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This patch introduces tracepoint definitions and tracepoint
event invocations for the s390 zcrypt device.
Currently there are just two tracepoint events defined.
An s390_zcrypt_req request event occurs as soon as the
request is recognized by the zcrypt ioctl function. This
event may act as some kind of request-processing-starts-now
indication.
As late as possible within the zcrypt ioctl function there
occurs the s390_zcrypt_rep event which may act as the point
in time where the request has been processed by the kernel
and the result is about to be transferred back to userspace.
The glue which binds together request and reply event is the
ptr parameter, which is the local buffer address where the
request from userspace has been stored by the ioctl function.
The main purpose of this zcrypt tracepoint patch is to get
some data for performance measurements together with
information about the kind of request and on which card and
queue the request has been processed. It is not an ffdc
interface as there is already code in the zcrypt device
driver to serve the s390 debug feature interface.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Rework the debug feature calls and initialization. There
are now two debug feature entries used by the zcrypt code.
The first is 'ap' with all the AP bus related stuff and the
second is 'zcrypt' with all the zcrypt and devices and
driver related entries. However, there isn't much traffic on
both debug features. The ap bus code emits only some debug
info and for zcrypt devices on appearance and disappearance
there is an entry written.
The new dbf invocations use the sprintf buffer layout,
whereas the old implementation used the ascii dbf buffer.
There are now 5*8=40 bytes used for each entry, resulting in
5 parameters per call. As the sprintf buffer needs a format
string the first parameter provides this and so up to 4 more
parameters can be used. Alltogehter the new layout should be
much more human readable for customers and test.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Add defines and switch case code to handle the two invalid
domain response codes better. Until now these two response
codes are handled via default resulting in -EAGAIN and
switching the processed queue to offline. So this kind of
malformed request bounced through all suitable queues and
switched them off. Now this kind of malformed request is
just rejected with EINVAL without switching off the queue.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
According to the system architecture the current implementation
requires the presence of the N bit in GR2 in the TAPQ response
field to validate the max. number of domains (Nd).
Older machine types don't have this N bit, hence the max. domain
field was ignored.
Before the N bit was introduced the maximum number of domain was
a constant value of 15. So set this value in case of N bit absence.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
For the older CEX2x and CEX3x cards the function bits returned
by TAPQ do not reflect the functions of the card. Instead the
functionality is implicit by the type of the card. The reworked
zcrypt requires to have the function bits set correct, so this
patch fixes this. The queue selection is not only based on these
function bits but also on function pointers set by the individual
drivers.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Currently the first eligible AP adapter respectively domain will be
selected to service requests. In case of sequential workload, the
very same adapter/domain will be used.
The adapter/domain selection algorithm now considers the completed
transactions per adaper/domain and therefore ensures a homogeneous
utilization.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Introduce new ioctl (ZDEVICESTATUS) to provide detailed
information, like hardware type, domains, status and functionality
of available crypto devices.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Currently the ap infrastructure only supports one domain at a time.
This feature extends the generic cryptographic device driver to
support multiple cryptographic domains simultaneously.
There are now card and queue devices on the AP bus with independent
card and queue drivers. The new /sys layout is as follows:
/sys/bus/ap
devices
<xx>.<yyyy> -> ../../../devices/ap/card<xx>/<xx>.<yyyy>
...
card<xx> -> ../../../devices/ap/card<xx>
...
drivers
<drv>card
card<xx> -> ../../../../devices/ap/card<xx>
<drv>queue
<xx>.<yyyy> -> ../../../../devices/ap/card<xx>/<xx>.<yyyy>
...
/sys/devices/ap
card<xx>
<xx>.<yyyy>
driver -> ../../../../bus/ap/drivers/<zzz>queue
...
driver -> ../../../bus/ap/drivers/<drv>card
...
The two digit <xx> field is the card number, the four digit <yyyy>
field is the queue number and <drv> is the name of the device driver,
e.g. "cex4".
For compatability /sys/bus/ap/card<xx> for the old layout has to exist,
including the attributes that used to reside there.
With additional contributions from Harald Freudenberger and
Martin Schwidefsky.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Crypto requests are very different in complexity and thus runtime.
Also various crypto adapters are differ with regard to the execution
time. Crypto requests can be balanced much better when the request
type and eligible crypto adapters are rated in a more precise
granularity. Therefore, request weights and adapter speed rates for
dedicated requests will be introduced.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The poll thread of the AP bus is burning CPU while waiting for
crypto requests to complete. We can as well burn a few more cycles
in the poll thread to check if there are pending requests and
remove the atomic operations with the ap_poll_requests.
This improves the code if the machine has adapter interrupts.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Now that the message type modules are linked with the zcrypt_api
into a single module the zcrypt_ops_list is initialized by
the module init function of the zcyppt.ko module. After that
the list is static and all message types are present.
Drop the zcrypt_ops_list_lock spinlock and the module handling
in regard to the message types.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Move the ap bus into the kernel and make it general available.
Additionally include the message types and the API layer as a
preparation for the workload management facility.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Heiko Carstens