- 25 Oct, 2010 40 commits
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Sebastian Ott authored
Writing to /proc/dasd/statistics while the debug level of the generic dasd debug entry is set to DBF_DEBUG will lead to an use after free when accessing the debug entry later. Since for the format string "%s" in the s390 dbf only a pointer to the string is stored in the debug feature and the buffer used here is freed afterwards. To fix this just remove the debug message. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Christian Borntraeger authored
commit 050eef36 [S390] fix tlb flushing vs. concurrent /proc accesses broke KVM on s390x. On every schedule a Badness at include/asm/mmu_context.h:83 appears. s390_enable_sie replaces the mm on the __running__ task, therefore, we have to increase the attach count of the new mm. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Peter Oberparleiter authored
Function ccw_device_cancel_halt_clear may cause an unexpected kernel panic if a clear function is currently active at the subchannel for which it is called. In that case, the iretry counter used to determine the number of retries is never initialized, leading to an immediate failure of the function which results in a kernel panic. Fix this by initializing the iretry counter when the function is first called. Also replace the kernel panic with a return code: a single malfunctioning I/O device should not automatically cause a system-wide kernel panic. Signed-off-by:
Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Switch default value of the kernel parameter 'topology' from off to on. Various performance measurements have finally shown that there are no (known) regressions anywhere. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Up to now print_cpu_info() uses the cpu address stored in it's local lowcore to print a message to the console. The cpu address in the lowcore is (in this case) however not the physical cpu address of the local cpu. It's the address of the cpu that issued the sigp restart which started the local cpu. Fix this by using the store cpu address instruction instead. It's not that anybody really cares since this is broken since more than ten years... Signed-off-by:
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Martin Schwidefsky authored
The ieee_instruction_pointer can not be read from user space anymore since git commit 613e1def, the ptrace interface always returns zero. Remove it from the thread_struct. It is still present in the user_regs_struct for compatability reasons. Signed-off-by:
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Martin Schwidefsky authored
Do the setup of the stack overflow argument for the sixth system call parameter right before the branch to the system call function. That simplifies the system call parameter access code. Signed-off-by: -
Martin Schwidefsky authored
The store-cpu-id instruction has a minimum alignment of 8. Reflect that in the definition of struct cpuid. Signed-off-by: -
Martin Schwidefsky authored
Read external interrupts parameters from the lowcore in the first level interrupt handler in entry[64].S. Signed-off-by: -
Martin Schwidefsky authored
Read all required fields for program checks from the lowcore in the first level interrupt handler in entry[64].S. If the context that caused the fault was enabled for interrupts we can now re-enable the irqs in entry[64].S. Signed-off-by: -
Heiko Carstens authored
All architectures besides s390 have pte_mkhuge() defined in pgtable.h. So move the function to pgtable.h on s390 as well. Fixes a compile error introduced with "hugetlb: hugepage migration core" in linux-next which only happens on s390. Signed-off-by:
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Martin Schwidefsky authored
Raise SIGBUS with a siginfo structure. Deliver BUS_ADRERR as si_code and the address of the fault in the si_addr field. Signed-off-by: -
Sebastian Ott authored
This patch adds a notification mechanism to inform ccw drivers about changes to channel paths, which occured while the device is online. Signed-off-by:
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Sebastian Ott authored
Update the subchannel descriptor while resuming from hibernate in order to obtain current link addresses. Signed-off-by:
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Sebastian Ott authored
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:
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Sebastian Ott authored
Update the channel path descriptor at the beginning of to the vary_on operation. Signed-off-by:
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Sebastian Ott authored
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:
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Sebastian Ott authored
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:
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Sebastian Ott authored
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:
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Sebastian Ott authored
Serialize access to members of struct channel_path with a mutex. Signed-off-by:
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Sebastian Ott authored
If a ccwdevice is lost during hibernation and a different ccwdevice is attached to the same subchannel, we will deregister the old ccw device and register the new one. Since deregistration is not allowed in this context, we handle this action later. However, some parts of the registration process for the new device were started anyway, so that the old device structure is no longer accessible. Fix this by deferring both actions to the afterwards scheduled subchannel event. Signed-off-by:
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Andy Shevchenko authored
Signed-off-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by:
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Stefan Haberland authored
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:
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Sebastian Ott authored
fix this sparse warning: drivers/s390/cio/css.c:580:6: warning: symbol 'css_schedule_eval_all_unreg' was not declared. Should it be static? Signed-off-by:
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Hendrik Brueckner authored
If the iucv_register() functions fails, the error recovery calls iucv_unregister() which might cause the following stack backtrace: (<0000000000100ab2> show_trace+0xee/0x144) <00000000004f1842> panic+0xb6/0x248 <00000000001010a6> die+0x15a/0x16c <000000000011d936> do_no_context+0xa6/0xe4 <00000000004f84dc> do_protection_exception+0x2e8/0x3a4 <0000000000113afc> pgm_exit+0x0/0x14 <00000000004e786e> iucv_unregister+0x5a/0x17c (<00000000004e785e> iucv_unregister+0x4a/0x17c) <000000000076de74> hvc_iucv_init+0x228/0x5dc <00000000001000c2> do_one_initcall+0x3e/0x19c <00000000007524a2> kernel_init+0x28e/0x404 <0000000000105dd6> kernel_thread_starter+0x6/0xc <0000000000105dd0> kernel_thread_starter+0x0/0xc Remove the call to iucv_unregister() and remove the goto label as unregistering is the last step in the hvc_iucv initialization. If iucv_register() fails, simply clean up hvc terminals and free resources. Signed-off-by:
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
When the cmm module is compiled into the kernel it will crash when writing to the R/O data section. Reason is the lower to upper case conversion of the "sender" module parameter which ignored the fact that the pointer is preinitialized. Introduced with 41b42876 "cmm, smsgiucv_app: convert sender to uppercase" Signed-off-by:
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Joe Perches authored
Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
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Heiko Carstens authored
schedule() makes sure that prev != next before calling switch_to(). Therefore remove the redundant check. Signed-off-by:
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Heiko Carstens authored
If the previous task was a kernel thread there is no need to save the contents of the fpu and access registers since they aren't used in kernel mode. For the same reason it is not necessary to restore these registers if the next task is a kernel thread. Signed-off-by:
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Heiko Carstens authored
Add a kernel config option for the IBM zEnterprise 196. This will produce faster code on newer compilers using the -march=z196 option. Signed-off-by:
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Heiko Carstens authored
Display machine capacity adjustment indicator and capacity change reason if available in /proc/sysinfo. Signed-off-by:
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Martin Schwidefsky authored
Add the new instructions introduced with z196 to the kernel disassembler. Signed-off-by: -
Martin Schwidefsky authored
Improve performance of the sske operation by using the nonquiescing variant if the affected page has no mappings established. On machines with no support for the new sske variant the mask bit will be ignored. Signed-off-by: -
Martin Schwidefsky authored
Use the store indication bit in the translation exception code on page faults to avoid the protection faults that immediatly follow the page fault if the access has been a write. Signed-off-by: -
Heiko Carstens authored
There is no difference if cpu_die is called from enabled or disabled context. Except that the fast_gup code might be called via cpu_die -> idle_task_exit -> __mm_drop -> crst_table_free. Which in turn grabs and releases a spinlock using the _bh ops, which is not allowed in irq disabled context, since spin_unlock_bh will unconditionally enable interrupts again. To get rid of the warning emitted by the softirq code just move the code to enabled context. In this case this doesn't fix a bug, we just get rid of a warning. Signed-off-by:
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Martin Schwidefsky authored
Implement get_user_pages_fast without locking in the fastpath on s390. Signed-off-by: -
Christof Schmitt authored
Set ARCH_HAS_SG_CHAIN for scatter lists on s390. Without this flag the SCSI code limits the maximum number of segments, so set it to make proper use of the FCP channel hardware. Signed-off-by:
Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Introducing this Kbuild file allow us to: make arch/s390/ And thus building all the core part of s390. Same as on other architectures. Signed-off-by:
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Stefan Weinhuber authored
The usual way to recover a failed DASD ECKD request (cqr) is to create a new request with an appropriate recovery CCW program. Certain features, e.g. failfast, can be enabled per request and are stored in the requests flags. These flags have to be copied from the failed to the recovery request, to let the recovery request use the same features as the original one. Signed-off-by:
Stefan Weinhuber <wein@de.ibm.com> Signed-off-by:
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Martin Schwidefsky authored
If the zero page is mapped to virtual user space addresses that differ only in bit 2^12 or 2^13 we get L1 cache synonyms which can affect performance. Follow the mips model and use multiple zero pages to avoid the synonyms. Signed-off-by:
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