- 26 Mar, 2009 39 commits
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Peter Oberparleiter authored
Subchannel reprobing can block the kslowcrw workqueue indefinitely while waiting for device recognition to finish which is also scheduled to run on kslowcrw. Prevent this deadlock by moving the waiting portion of subchannel reprobing to the cio workqueue. Signed-off-by:
Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Sebastian Ott authored
Remove unused subchannel pointer in io_subchannel_recog_done. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
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Peter Oberparleiter authored
Fix incorrect check for active I/O in interrogate function. Signed-off-by:
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Sebastian Ott authored
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:
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Sebastian Ott authored
Writing only spaces to /proc/cio_ignore will cause a buffer overflow since the size_t value i will not become negative and so buf[-1UL] is accessed. Change the value of i to ssize_t. Signed-off-by:
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Sebastian Ott authored
For a ccw group device unbinding it from its driver should do the same as a call to ungroup, since this virtual device can not exist without a driver. Signed-off-by:
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Sebastian Ott authored
Some sanity checks in the ccw group driver test the output of container_of macros to be !NULL. Test the input parameters instead. Signed-off-by:
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Sebastian Ott authored
In case the ccw group driver refuses to set a device [on|off]line, we should transmit the return code to the caller. Signed-off-by:
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Sebastian Ott authored
MAX_ISC is a valid isc number, so arrays with an index of isc need to have a length of MAX_ISC+1 Signed-off-by:
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Sebastian Ott authored
Since some callers rely on for_each_subchannel_staged to not fail, fall back to brute force scanning using get_subchannel_by_schid in case of a oom situation. Signed-off-by:
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Heiko Carstens authored
Add barrier to prevent compiler from reloading pointer to irq handler. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
The crw_unregister_handler uses xchg + synchronize_sched when unregistering a crw_handler. This doesn't protect crw_collect_info to potentially jump to NULL since it has unlocked code like this: if (crw_handlers[i]) crw_handlers[i](NULL, NULL, 1); So add a mutex which protects the crw handler array for changes. Signed-off-by: -
Sebastian Ott authored
In case the ccw driver refuses to set a device offline, we should transmit the return code to the caller. Signed-off-by:
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Cornelia Huck authored
Use ccw_device_set_notoper() (which also deletes the device timer and disables the subchannel) instead of simply setting the state to DEV_STATE_NOT_OPER in the generic not operational handling code. This prevents unexpected interrupts popping up for devices that are deemed not operational. Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
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Cornelia Huck authored
Acting upon the assumption that cio_disable_subchannel() is only called when we really want to disable the subchannel (a) remove the check for activity (it is already done in ccw_device_offline(), which is the place where it matters) (b) collect pending status via tsch() and ignore it (it can't matter anymore since the subchannel will be disabled). Signed-off-by: -
Cornelia Huck authored
The common I/O layer may encounter a situation where the device number of a ccw device has changed or a device driver doesn't want to keep a formerly disconnected device becoming operational again. Instead of using device_del()/ device_add() as now, we can just unbind the driver from the device and rebind it to get the desired effect (rebinding) with less overhead. Signed-off-by:
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Heiko Carstens authored
Move all EXPORT_SYMBOLs to their corresponding definitions. Signed-off-by:
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Heiko Carstens authored
Signed-off-by:
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Heiko Carstens authored
Everybody enables it so there is no point for an extra config option. Signed-off-by:
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Heiko Carstens authored
Split machine check handler code and move it to cio and kernel code where it belongs to. No functional change. Signed-off-by:
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Sachin Sant authored
With CONFIG_NET not set appldata build breaks on s390. arch/s390/appldata/built-in.o: In function appldata_get_net_sum_data: appldata_net_sum.c:(.text+0x2684): undefined reference to dev_get_stats appldata_net_sum.c:(.text+0x2688): undefined reference to init_net appldata_net_sum.c:(.text+0x268c): undefined reference to init_net appldata_net_sum.c:(.text+0x2694): undefined reference to dev_base_lock The following patch fixes the issue for me. Signed-off-by:
Sachin Sant <sachinp@in.ibm.com> Signed-off-by:
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Heiko Carstens authored
The ftrace code is currently not reentrant, so we better don't trace our machine check handler. Machine checks are handled like NMIs on s390. Signed-off-by:
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Christian Borntraeger authored
Currently we use the cpuid (via STIDP instruction) to recognize LPAR, z/VM and KVM. The architecture states, that bit 0-7 of STIDP returns all zero, and if STIDP is executed in a virtual machine, the VM operating system will replace bits 0-7 with FF. KVM should not use FE to distinguish z/VM from KVM for interested guests. The proper way to detect the hypervisor is the STSI (Store System Information) instruction, which return information about the hypervisors via function code 3, selector1=2, selector2=2. This patch changes the detection routine of Linux to use STSI instead of STIDP. This detection is earlier than bootmem, we have to use a static buffer. Since STSI expects a 4kb block (4kb aligned) this patch also changes the init.data alignment for s390. As this section will be freed during boot, this should be no problem. Patch is tested with LPAR, z/VM, KVM on LPAR, and KVM under z/VM. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Carsten Otte authored
The sie instruction requires address spaces to be switched to run proper. This patch verifies that this is the case in s390_enable_sie, otherwise the kernel would crash badly as soon as the process runs into sie. Signed-off-by:
Carsten Otte <cotte@de.ibm.com> Signed-off-by:
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Christian Borntraeger authored
With lockdep we got the following trace after a panic: Badness at /home/autobuild/BUILD/linux-2.6.28-20090204/kernel/lockdep.c:2878 [...] Call Trace: [<0000000000176334>] lock_acquire+0x54/0xbc [<000000000050b4fe>] __atomic_notifier_call_chain+0x6e/0xdc [<000000000050b59c>] atomic_notifier_call_chain+0x30/0x44 [<0000000000504274>] panic+0xd0/0x1e8 [...] INFO: lockdep is turned off. Last Breaking-Event-Address: [<0000000000170e62>] check_flags+0xae/0x15c possible reason: unannotated irqs-off. lockdep is right. We missed a trace_hardirq_off in our smp_send_stop function and smp_send_stop is called before the panic call chain. Reported-by: Mijo <Safradin mijo@linux.vnet.ibm.com> Signed-off-by:
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Hendrik Brueckner authored
This patch introduces the kernel parameter hvc_iucv_allow= that specifies a comma-separated list of z/VM user IDs. If specified, the z/VM IUCV hypervisor console device driver accepts IUCV connections from listed z/VM user IDs only. Signed-off-by:
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by:
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Hendrik Brueckner authored
If the hvc_iucv= kernel parameter specifies a value that is not valid, display an error message. Minor changes to existing kernel messages. Signed-off-by:
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Heiko Carstens authored
Initialize per thread timer values instead of just copying them from the parent. That way it is easily possible to tell how much time a thread spent in user/system context. Doesn't fix a bug, this is just for debugging purposes. Signed-off-by:
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Heiko Carstens authored
Fix all the whitespace damage in process.c, especially copy_thread(). Next patch will add code to copy_thread() which needs to 'fixed' first. Signed-off-by:
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Heiko Carstens authored
Dead file. Seems to be a leftover from the 2.4->2.5 conversion. The used and uptodate version of this file is in arch/s390/kernel. Signed-off-by:
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Heiko Carstens authored
All in sysinfo.c is core kernel code and not driver code. So move it to arch/s390/kernel. Also includes some small cleanups. Signed-off-by:
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Stefan Haberland authored
Moved some Messages into s390 debug feature and changed remaining messages to use the dev_xxx and pr_xxx macros. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Stefan Weinhuber authored
To support High Performance FICON, the DASD device driver has to translate I/O requests into the new transport mode control words (TCW) instead of the traditional (command mode) CCW requests. Signed-off-by:
Stefan Weinhuber <wein@de.ibm.com> Signed-off-by:
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Stefan Weinhuber authored
The dasd device driver will now support ECKD devices with more then 65520 cylinders. In the traditional ECKD adressing scheme each track is addressed by a 16-bit cylinder and 16-bit head number. The new addressing scheme makes use of the fact that the actual number of heads is never larger then 15, so 12 bits of the head number can be redefined to be part of the cylinder address. Signed-off-by:
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Jean-Baptiste Joret authored
Permission is now granted to the subsystem to format write R0 with: * an ID = CCHHR, where CC = physical cylinder number, HH = physical head number, and R = 0 * a key length of zero * a data length of eight * a data field containing all zeros Signed-off-by:
Jean-Baptiste Joret <joret@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
All of the ioctls are compatible. Just enable them. Signed-off-by:
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Heiko Carstens authored
s390 arch backend for 1c0fe6e3 "mm: invoke oom-killer from page fault". Signed-off-by:
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Frank Munzert authored
Provide new shutdown action "dump_reipl" for automatic ipl after dump. Signed-off-by:
Frank Munzert <munzert@de.ibm.com> Signed-off-by:
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Christian Borntraeger authored
The s390 implemenation of dump_stack uses %p to display stack content. Since d97106ab (Make %p print '(null)' for NULL pointers) this causes a strange output for dump_stack: [...] Process basename (pid: 8822, task: 00000000b2ece038, ksp: 00000000b24d7b38) 04000000b5685c00 00000000b24d7760 0000000000000002 (null) 00000000b24d7800 00000000b24d7778 00000000b24d7778 00000000001052fe (null) 00000000b24d7b38 (null) 000000000000000a 000000000000000d (null) 00000000b24d7760 00000000b24d77d8 000000000051a7e8 00000000001052fe 00000000b24d7760 00000000b24d77b0 Call Trace: [...] This patch changes our dump_stack to use the appropriate %x format. Signed-off-by:
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- 23 Mar, 2009 1 commit
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Linus Torvalds authored
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