- 09 Oct, 2014 5 commits
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Martin Schwidefsky authored
Move the C functions and definitions related to the idle state handling to arch/s390/include/asm/idle.h and arch/s390/kernel/idle.c. The function s390_get_idle_time is renamed to arch_cpu_idle_time and vtime_stop_cpu to enabled_wait. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Move the nohz_delay bit from the s390_idle data structure to the per-cpu flags. Clear the nohz delay flag in __cpu_disable and remove the cpu hotplug notifier that used to do this. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
The sysfs attributes /sys/devices/system/cpu/cpu0/idle_count and /sys/devices/system/cpu/cpu0/idle_time_us are reset to zero every time a CPU is set online. The idle and iowait fields in /proc/stat corresponding to idle_time_us are not reset. To make things consistent do not reset the data for the sys attributes. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Stefan Haberland authored
Add support for Control Unit Initiated Reconfiguration (CUIR) to Linux, a storage server interface to reconcile concurrent hardware changes between storage and host. Reviewed-by:
Stefan Weinhuber <wein@de.ibm.com> Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Stefan Haberland authored
Error recovery requests may not be cleaned up correctly so that other needed erp requests can not be build because of insufficient memory. This would lead to an infinite loop trying to build erp requests. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 30 Sep, 2014 1 commit
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Heiko Carstens authored
Invalidate several pte entries at once if the ipte range facility is available. Currently this works only for DEBUG_PAGE_ALLOC where several up to 2 ^ MAX_ORDER may be invalidated at once. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 26 Sep, 2014 2 commits
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Martin Schwidefsky authored
Fix calculation to decide if a 4-level kernel page table is required. Git commit c972cc60 "s390/vmalloc: have separate modules area" added the separate module area which reduces the size of the vmalloc area but fails to take it into account for the 3 vs 4 level page table decision. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
The call to topology_init is too late for the set_sched_topology call. The initial scheduling domain structure has already been established with default topology array. Use the smp_cpus_done() call to get the s390 specific topology array registered early enough. Cc: stable@vger.kernel.org # v3.16+ Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 25 Sep, 2014 14 commits
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Jan Willeke authored
Signed-off-by:
Jan Willeke <willeke@de.ibm.com> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Jan Willeke authored
This patch moves common functions from kprobes.c to probes.c. Thus its possible for uprobes to use them without enabling kprobes. Signed-off-by:
Jan Willeke <willeke@de.ibm.com> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Make use of the load-and-add, load-and-or and load-and-and instructions to atomically update the read-write lock without a compare-and-swap loop. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Set the write-lock bit in the out-of-line rwlock code to indicate that a writer is waiting. Additional readers will no be able to get the lock until at least one writer got the lock. Additional writers have to wait for the first writer to release the lock again. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
If the vmemmap array gets filled with large pages we allocate those pages with vmemmap_alloc_block(), which returns cleared pages. Only for single 4k pages we call our own vmem_alloc_pages() which does not return cleared pages. However we can also call vmemmap_alloc_block() to allocate the 4k pages. This way we can also make sure the vmemmap array is cleared after its population. Therefore we can remove the memset at the end of the function which would clear the vmmemmap array a second time on machines which do support EDAT1. On very large configurations this can save us several seconds. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Christian Borntraeger authored
The architecture suggests to use address 0 as parameter for stfl, to allow for future extensions. Using __LC_STFL_FAC_LIST (0x200) shows which address is used, but might be not future proof. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Add an owner field to the arch_rwlock_t to be able to pass the timeslice of a virtual CPU with diagnose 0x9c to the lock owner in case the rwlock is write-locked. The undirected yield in case the rwlock is acquired writable but the lock is read-locked is removed. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Ingo Tuchscherer authored
Signed-off-by:
Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Stefan Haberland authored
Remove tape_state from status register and report the drive's current setting for block size instead as known from other tapes. Density is not supported so nothing to report here. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Ralf Hoppe authored
This device driver allows accessing a HMC drive CD/DVD-ROM. It can be used in a LPAR and z/VM environment. Reviewed-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Ralf Hoppe <rhoppe@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
The event type masks can change asynchronously. These changes are reported by SCLP to the OS by state-change events which are retrieved with the read event data command. The SCLP driver has a request queue, there is a window where the read event data request has not completed yet but the SCLP console drivers are trying to queue output requests. As the masks are not updated yet the requests are discarded. The simplest fix is to queue the console requests independent of the event type masks and rely on SCLP to return with an error code if a specific event type is not available. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Ingo Tuchscherer authored
Extends the number of ap domains within the zcrypt device driver up to 256. AP domains in the range 00..255 will be detected. Signed-off-by:
Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 09 Sep, 2014 11 commits
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Heiko Carstens authored
Use a memory barrier + store sequence instead of a load + compare and swap sequence to unlock a spinlock and an rw lock. For the spinlock case this saves us two memory reads and a not needed cpu serialization after the compare and swap instruction stored the new value. The kernel size (performance_defconfig) gets reduced by ~14k. Average execution time of a tight inlined spin_unlock loop drops from 5.8ns to 0.7ns on a zEC12 machine. An artificial stress test case where several counters are protected with a single spinlock and which are only incremented while holding the spinlock shows ~30% improvement on a 4 cpu machine. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Reduce the number of executed instructions within the mcount block if function tracing is enabled. We achieve that by using a non-standard C function call ABI. Since the called function is also written in assembler this is not a problem. This also allows to replace the unconditional store at the beginning of the mcount block with a larl instruction, which doesn't touch memory. In theory we could also patch the first instruction of the mcount block to enable and disable function tracing. However this would break kprobes. This could be fixed with implementing the "kprobes_on_ftrace" feature; however keeping the odd jprobes working seems not to be possible without a lot of code churn. Therefore keep the code easy and simply accept one wasted 1-cycle "larl" instruction per function prologue. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Even if it has a __used annotation it is actually unused. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
We have too many combinations for function tracing. Lets simply stick to the most advanced option, so we don't have to care of other combinations. This means we always select DYNAMIC_FTRACE if FUNCTION_TRACER is selected. In the s390 Makefile also remove CONFIG_FTRACE_SYSCALLS since that functionality got moved to architecture independent code in the meantime. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
This code is based on a patch from Vojtech Pavlik. http://marc.info/?l=linux-s390&m=140438885114413&w=2 The actual implementation now differs significantly: Instead of adding a second function "ftrace_regs_caller" which would be nearly identical to the existing ftrace_caller function, the current ftrace_caller function is now an alias to ftrace_regs_caller and always passes the needed pt_regs structure and function_trace_op parameters unconditionally. Besides that also use asm offsets to correctly allocate and access the new struct pt_regs on the stack. While at it we can make use of new instruction to get rid of some indirect loads if compiled for new machines. The passed struct pt_regs can be changed by the called function and it's new contents will replace the current contents. Note: to change the return address the embedded psw member of the pt_regs structure must be changed. The psw member is right now incomplete, since the mask part is missing. For all current use cases this should be sufficent. Providing and restoring a sane mask would mean we need to add an epsw/lpswe pair to the mcount code. Only these two instruction would cost us ~120 cycles which currently seems not necessary. Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
When the function graph tracer is disabled we can skip three additional instructions. So let's just do this. So if function tracing is enabled but function graph tracing is runtime disabled, we get away with a single unconditional branch. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Currently the march flag gets only passed to C files, but not to assembler files. This means that we can't add new instructions like e.g. aghik to asm files, since the assembler doesn't know of the new instructions if the appropriate march flag isn't specified. So also pass the march flag when compiling assembler files as well. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
Add CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE optimization to the 64-bit and 31-bit vdso. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Martin Schwidefsky authored
If gettimeofday / clock_gettime are called multiple times in a row the STCK instruction will stall until a difference in the result is visible. This unnecessarily slows down the vdso calls, use stcke instead of stck to get rid of the stall. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
s390 supports kprobes since 2006 but is missing in the list of architectures that support kprobes. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 08 Sep, 2014 7 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4Linus Torvalds authored
Pull ext4 bugfix from Ted Ts'o. [ Hmm. It's possible we should make kfree() aware of error pointers, and use IS_ERR_OR_NULL rather than a NULL check. But in the meantime this is obviously the right fix. - Linus ] * 'for_linus_urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: avoid trying to kfree an ERR_PTR pointer
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git://linux-nfs.org/~bfields/linuxLinus Torvalds authored
Pull nfsd bugfixes from Bruce Fields: "A couple minor nfsd bugfixes" * 'for-3.17' of git://linux-nfs.org/~bfields/linux: lockd: fix rpcbind crash on lockd startup failure nfsd4: fix rd_dircount enforcement
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J. Bruce Fields authored
Nikita Yuschenko reported that booting a kernel with init=/bin/sh and then nfs mounting without portmap or rpcbind running using a busybox mount resulted in: # mount -t nfs 10.30.130.21:/opt /mnt svc: failed to register lockdv1 RPC service (errno 111). lockd_up: makesock failed, error=-111 Unable to handle kernel paging request for data at address 0x00000030 Faulting instruction address: 0xc055e65c Oops: Kernel access of bad area, sig: 11 [#1] MPC85xx CDS Modules linked in: CPU: 0 PID: 1338 Comm: mount Not tainted 3.10.44.cge #117 task: cf29cea0 ti: cf35c000 task.ti: cf35c000 NIP: c055e65c LR: c0566490 CTR: c055e648 REGS: cf35dad0 TRAP: 0300 Not tainted (3.10.44.cge) MSR: 00029000 <CE,EE,ME> CR: 22442488 XER: 20000000 DEAR: 00000030, ESR: 00000000 GPR00: c05606f4 cf35db80 cf29cea0 cf0ded80 cf0dedb8 00000001 1dec3086 00000000 GPR08: 00000000 c07b1640 00000007 1dec3086 22442482 100b9758 00000000 10090ae8 GPR16: 00000000 000186a5 00000000 00000000 100c3018 bfa46edc 100b0000 bfa46ef0 GPR24: cf386ae0 c07834f0 00000000 c0565f88 00000001 cf0dedb8 00000000 cf0ded80 NIP [c055e65c] call_start+0x14/0x34 LR [c0566490] __rpc_execute+0x70/0x250 Call Trace: [cf35db80] [00000080] 0x80 (unreliable) [cf35dbb0] [c05606f4] rpc_run_task+0x9c/0xc4 [cf35dbc0] [c0560840] rpc_call_sync+0x50/0xb8 [cf35dbf0] [c056ee90] rpcb_register_call+0x54/0x84 [cf35dc10] [c056f24c] rpcb_register+0xf8/0x10c [cf35dc70] [c0569e18] svc_unregister.isra.23+0x100/0x108 [cf35dc90] [c0569e38] svc_rpcb_cleanup+0x18/0x30 [cf35dca0] [c0198c5c] lockd_up+0x1dc/0x2e0 [cf35dcd0] [c0195348] nlmclnt_init+0x2c/0xc8 [cf35dcf0] [c015bb5c] nfs_start_lockd+0x98/0xec [cf35dd20] [c015ce6c] nfs_create_server+0x1e8/0x3f4 [cf35dd90] [c0171590] nfs3_create_server+0x10/0x44 [cf35dda0] [c016528c] nfs_try_mount+0x158/0x1e4 [cf35de20] [c01670d0] nfs_fs_mount+0x434/0x8c8 [cf35de70] [c00cd3bc] mount_fs+0x20/0xbc [cf35de90] [c00e4f88] vfs_kern_mount+0x50/0x104 [cf35dec0] [c00e6e0c] do_mount+0x1d0/0x8e0 [cf35df10] [c00e75ac] SyS_mount+0x90/0xd0 [cf35df40] [c000ccf4] ret_from_syscall+0x0/0x3c The addition of svc_shutdown_net() resulted in two calls to svc_rpcb_cleanup(); the second is no longer necessary and crashes when it calls rpcb_register_call with clnt=NULL. Reported-by:
Nikita Yushchenko <nyushchenko@dev.rtsoft.ru> Fixes: 679b033d "lockd: ensure we tear down any live sockets when socket creation fails during lockd_up" Cc: stable@vger.kernel.org Acked-by:
Jeff Layton <jlayton@primarydata.com> Signed-off-by:
J. Bruce Fields <bfields@redhat.com>
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J. Bruce Fields authored
Commit 3b299709 "nfsd4: enforce rd_dircount" totally misunderstood rd_dircount; it refers to total non-attribute bytes returned, not number of directory entries returned. Bring the code into agreement with RFC 3530 section 14.2.24. Cc: stable@vger.kernel.org Fixes: 3b299709 "nfsd4: enforce rd_dircount" Signed-off-by:
J. Bruce Fields <bfields@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linuxLinus Torvalds authored
Pull s390 fixes from Martin Schwidefsky: "A bug fix for the vdso code, the loadparm for booting from SCSI is added and the access permissions for the dasd module parameters are corrected" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/vdso: remove NULL pointer check from clock_gettime s390/ipl: Add missing SCSI loadparm attributes to /sys/firmware s390/dasd: Make module parameter visible in sysfs
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroupLinus Torvalds authored
Pull cgroup fixes from Tejun Heo: "This pull request includes Alban's patch to disallow '\n' in cgroup names. Two other patches from Li to fix a possible oops when cgroup destruction races against other file operations and one from Vivek to fix a unified hierarchy devel behavior" * 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: check cgroup liveliness before unbreaking kernfs cgroup: delay the clearing of cgrp->kn->priv cgroup: Display legacy cgroup files on default hierarchy cgroup: reject cgroup names with '\n'
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpuLinus Torvalds authored
Pull percpu fixes from Tejun Heo: "One patch to fix a failure path in the alloc path. The bug is dangerous but probably not too likely to actually trigger in the wild given that there hasn't been any report yet. The other two are low impact fixes" * 'for-3.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: free percpu allocation info for uniprocessor system percpu: perform tlb flush after pcpu_map_pages() failure percpu: fix pcpu_alloc_pages() failure path
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