- 25 Dec, 2008 40 commits
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Sebastian Ott authored
To change the configuration of a subchannel we alter the modifiable bits of the subchannel's schib field and issue a modify subchannel. There can be the case that not all changes were applied -or worse- quietly overwritten by the hardware. With the next store subchannel we obtain the current state of the hardware but lose our target configuration. With this patch we introduce a subchannel_config structure which contains the target subchannel configuration. Additionally the msch wrapper cio_modify is replaced with cio_commit_config which copies the desired changes to a temporary schib. msch is then called with the temporary schib. This schib is only written back to the subchannel if all changes were applied. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Sebastian Ott authored
There is the chance that we get condition code 0 for a stsch but the resulting schib is not vaild. In the current code there are 2 cases: * we do a check for validity of the schib after stsch, but at this time we have already stored the invaild schib in the subchannel structure. This may lead to problems. * we don't do a check for validity, which is not that good either. The patch addresses both issues by introducing the stsch wrapper cio_update_schib which performs stsch on a local schib. This schib is only written back to the subchannel if it's valid. side note: For some functions (chp_events) the return codes are different now (-ENXIO vs -ENODEV) but this shouldn't do harm since the caller doesn't check for _specific_ errors. Signed-off-by:
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Cornelia Huck authored
Check if a ccw device is registered via device_is_registered() and not via the old kludge of checking the membership in driver core internal klists. Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
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Cornelia Huck authored
Just put the cdev's reference count to give up our reference. Signed-off-by:
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Cornelia Huck authored
If we fail the probe for an I/O subchannel, we won't be able to unregister it again since there are no sch_event() callbacks for unbound subchannels. Just succeed the probe in any case and schedule unregistering the subchannel. Signed-off-by:
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Cornelia Huck authored
There is a race between io_subchannel_register() and io_subchannel_sch_event() which may cause a subchannel to be unregistered because it is no longer operational before io_subchannel_register() had run. We need to check whether the subchannel is still registered before the ccw device can be registered and just bail out if it is not. Signed-off-by:
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Cornelia Huck authored
Subchannel refcounting was incorrect in some places, especially a refcount was missing when ccw_device_call_sch_unregister() was called and the refcount was not correctly switched after moving devices. Fix this by establishing the following rules: - The ccw_device obtains a reference on its parent subchannel when dev.parent is set and gives it up in its release function. This is needed because we need a parent reference for correct refcounting even before the ccw device is (if at all) registered. - When calling device_move(), obtain a reference on the new subchannel before moving the ccw device and give up the reference on the old parent after moving. This brings the refcount in line with the first rule. Signed-off-by:
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Cornelia Huck authored
The current code attempts to get an extra reference count for online devices by doing a get_device() in ccw_device_online() and a put_device() in ccw_device_done(). However, this - incorrectly obtains an extra reference for disconnected devices becoming available again (since they are already online) - needs special checks for css_init_done in order to handle the console device - is not obvious and - may incorretly drop a reference count in ccw_device_done() if that function is called after path verification for a device that just became not operational. So let's just get the reference in ccw_device_set_online() and drop it in ccw_device_set_offline(). (Unfortunately, we still need the special case in io_subchannel_probe().) Signed-off-by:
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Cornelia Huck authored
Signed-off-by:
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Peter Oberparleiter authored
Ensure atomicity of ungroup operation to prevent concurrent ungroup and online processing which may lead to use-after-release situations. Signed-off-by:
Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by:
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Sebastian Ott authored
Due to former patches a comment and device id initialization were split from the addressed function call in io_subchannel_probe. Move it back to where it belongs. Signed-off-by:
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Peter Oberparleiter authored
Values for the sac field have changed - update code accordingly. Signed-off-by:
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Heiko Carstens authored
Move cio_tpi() to the rest of the CONFIG_CCW_CONSOLE functions to get rid of this one: drivers/s390/cio/cio.c:115: warning: 'cio_tpi' defined but not used Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
A kernel compile on 31 bit gives the following warnings in ptrace.c: arch/s390/kernel/ptrace.c: In function 'peek_user': arch/s390/kernel/ptrace.c:207: warning: unused variable 'dummy' arch/s390/kernel/ptrace.c: In function 'poke_user': arch/s390/kernel/ptrace.c:315: warning: unused variable 'dummy' Getting rid of the dummy variables removes the warnings. Signed-off-by: -
Martin Schwidefsky authored
For CONFIG_SPARSEMEM_VMEMMAP=y on s390 I get warnings like init/main.c: In function 'start_kernel': init/main.c:641: warning: format '%08lx' expects type 'long unsigned int', but argument 2 has type 'int' The warning can be suppressed with a cast to unsigned long in the CONFIG_SPARSEMEM_VMEMMAP=y version of __page_to_pfn. Signed-off-by: -
Hendrik Brueckner authored
Provide a locking free version of iucv_message_receive and iucv_message_send that do not call local_bh_enable in a spin_lock_(bh|irqsave)() context. Signed-off-by:Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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Hendrik Brueckner authored
This patch introduces a new hypervisor console (HVC) back-end that provides terminal access over the z/VM inter-user communication vehicle (IUCV). The z/VM IUCV communication is independent of the regular tcp/ip network and allows access even if there is no network connection between two z/VM guest virtual machines. The z/VM IUCV hypervisor console back-end helps the user to access a z/VM guest virtual machine that lacks of network connectivity; and thus, provides a "full-screen" terminal alternative to 3215/3270 terminal sessions. Use the hvc_iucv=[0..8] kernel boot parameter to specify the number of HVC terminals using a z/VM IUCV back-end. A recent version of the s390-tools package is required to establish a terminal connection to a z/VM IUCV hypervisor console back-end. Signed-off-by:
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Heiko Carstens authored
This implements just the basic function tracer (_mcount) backend for s390. The dynamic variant will come later. Signed-off-by:
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Kay Sievers authored
Acked-by:
Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:
Kay Sievers <kay.sievers@vrfy.org> Signed-off-by:
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Stefan Haberland authored
__dasd_cleanup_cqr should be called with request_queue_lock held and __dasd_block_process_erp with queue_lock Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Stefan Haberland authored
SIM sense data are always 32 bit sense data so sense byte 27 bit 0 has not to be set. Signed-off-by:
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Cornelia Huck authored
Signed-off-by:
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Stefan Haberland authored
For a large number of I/O requests the values were shifted binary. The shift was not transparent for the user because the shift value was not displayed. To make this interface more human readable the values are shifted decimal and the scale factor is displayed. Signed-off-by:
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Christof Schmitt authored
Register zfcp with the new /proc/service_level interface to report the FCP microcode level. When the adapter goes offline or a channel path disappears, zfcp unregisters, since the microcode version might change and zfcp does not know about it. Signed-off-by:
Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
Add a new proc interface /proc/service_levels that allows any code to report a relevant service level, e.g. the microcode level of devices, the service level of the hypervisor, etc. Signed-off-by: -
Jan Glauber authored
Hipersocket connections can encounter temporary busy conditions. In case of the busy bit set we retry the SIGA operation immediatelly. If the busy condition still persists after 100 ms we fail and report the error to the upper layer. The second stage retry logic is removed. In case of ongoing busy conditions the upper layer needs to reset the connection. The reporting of a SIGA error is now done synchronously to allow the network driver to requeue the buffers. Also no error trace is created for the temporary SIGA errors so the error message view is not flooded. Signed-off-by:
Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by:
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Jan Glauber authored
- Use automatic acknowledgement of incoming buffers in QEBSM mode - Move ACK for non-QEBSM mode always to the newest buffer to prevent a race with qdio_stop_polling - Remove the polling spinlock, the upper layer drivers return new buffers in the same code path and could not run in parallel - Don't flood the error log in case of no-target-buffer-empty - In handle_inbound we check if we would overwrite an ACK'ed buffer, if so advance the pointer to the oldest ACK'ed buffer so we don't overwrite an empty buffer in qdio_stop_polling Signed-off-by:
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Jan Glauber authored
- make qdio_trace a per device view - remove s390dbf exceptions - remove CONFIG_QDIO_DEBUG, not needed anymore if we check for the level before calling sprintf - use snprintf for dbf entries - add start markers to see if the dbf view wrapped - add a global error view for all queues Signed-off-by:
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Jan Glauber authored
The QEBSM instructions are only available for CONFIG_64BIT, they are not used under 31 bit. Make compiler happy about the false positive: drivers/s390/cio/qdio_main.c: In function ?qdio_inbound_q_done?: drivers/s390/cio/qdio_main.c:532: warning: ?state? may be used uninitialized in this function Signed-off-by:
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Jan Glauber authored
Add counters for the eqbs and sqbs instructions that indicate how often we issued the instructions and how often the instructions returned with less buffers than specified. Signed-off-by:
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Jan Glauber authored
qeth needs to get the port count information before qdio has allocated a page for the chsc operation. Extend qdio_get_ssqd_desc() to store the data in the specified structure. Signed-off-by:
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Christian Maaser authored
Changed some symbol names for a better and clearer code. Signed-off-by:
Christian Maaser <cmaaser@de.ibm.com> Signed-off-by:
Felix Beck <beckf@de.ibm.com> Signed-off-by:
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Felix Beck authored
When the machine supports AP adapter interrupts polling will be switched off at module initialization and the driver will work in interrupt mode. Signed-off-by:
Felix Beck <felix.beck@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
stfle will be needed by the ap_bus module to figure out wether the AP queue adapter interruption facility is installed. Signed-off-by:
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Heiko Carstens authored
Since etr/stp don't need the old smp_call_function semantics anymore we can convert s390 to the generic IPI infrastructure. Signed-off-by:
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Martin Schwidefsky authored
The work function dispatched with schedule_work() can be run twice on different cpus because run_workqueue clears the WORK_STRUCT_PENDING bit and then executes the function. Another cpu can call schedule_work() again and run the work function a second time before the first call is completed. This patch serialized the etr and stp work function with a mutex. Signed-off-by: -
Heiko Carstens authored
This converts the etr and stp code to the new stop_machine interface which allows to synchronize all cpus without allocating any memory. This way we get rid of the only reason why we haven't converted s390 to the generic IPI interface yet. Signed-off-by:
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Martin Schwidefsky authored
Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for CLOCK_REALTIME/CLOCK_MONOTONIC. Signed-off-by: -
Martin Schwidefsky authored
arch_setup_additional_pages currently gets two arguments, the binary format descripton and an indication if the process uses an executable stack or not. The second argument is not used by anybody, it could be removed without replacement. What actually does make sense is to pass an indication if the process uses the elf interpreter or not. The glibc code will not use anything from the vdso if the process does not use the dynamic linker, so for statically linked binaries the architecture backend can choose not to map the vdso. Acked-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Christian Borntraeger authored
The vmcp driver uses the session->mutex for concurrent access of the data structures. Therefore, the BKL in vmcp_open does not protect against any other function in the driver. The BLK in vmcp_open would protect concurrent access to the module init but all necessary steps ave finished before misc_register is called. We can safely remove the lock_kernel from vcmp. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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