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| * | | | s390/perf: make print_debug_cf() staticHeiko Carstens2014-03-14
| | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/topology: Remove call to update_cpu_masks()Philipp Hachtmann2014-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The call to update_cpu_masks() from within topology_init() is completely redundant. This patch removes it. Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/compat: remove compat exec domainHeiko Carstens2014-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The whole compat exec domain code doesn't make any difference. From the registered s390_exec_domain: - exec domain name is only displayed in /proc/execdomains - handler is unused - pers_low and pers_high are only used internally to find this specific exec domain otherwise the default exec domain will be used - all other fields match the default exec domain So let's get rid of this. Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/mm,tlb: race of lazy TLB flush vs. recreation of TLB entriesMartin Schwidefsky2014-02-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Git commit 050eef364ad70059 "[S390] fix tlb flushing vs. concurrent /proc accesses" introduced the attach counter to avoid using the mm_users value to decide between IPTE for every PTE and lazy TLB flushing with IDTE. That fixed the problem with mm_users but it introduced another subtle race, fortunately one that is very hard to hit. The background is the requirement of the architecture that a valid PTE may not be changed while it can be used concurrently by another cpu. The decision between IPTE and lazy TLB flushing needs to be done while the PTE is still valid. Now if the virtual cpu is temporarily stopped after the decision to use lazy TLB flushing but before the invalid bit of the PTE has been set, another cpu can attach the mm, find that flush_mm is set, do the IDTE, return to userspace, and recreate a TLB that uses the PTE in question. When the first, stopped cpu continues it will change the PTE while it is attached on another cpu. The first cpu will do another IDTE shortly after the modification of the PTE which makes the race window quite short. To fix this race the CPU that wants to attach the address space of a user space thread needs to wait for the end of the PTE modification. The number of concurrent TLB flushers for an mm is tracked in the upper 16 bits of the attach_count and finish_arch_post_lock_switch is used to wait for the end of the flush operation if required. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/uaccess: remove dead kernel parameter 'user_mode='Heiko Carstens2014-02-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove another leftover from the time when we supported running user space in either home or primary address space. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/setup: get rid of MACHINE_HAS_MVCOS machine flagHeiko Carstens2014-02-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | MACHINE_HAS_MVCOS is used exactly once when the machine is brought up. There is no need to cache the flag in the machine_flags. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | | s390/uaccess: get rid of indirect function callsHeiko Carstens2014-02-21
| |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are only two uaccess variants on s390 left: the version that is used if the mvcos instruction is available, and the page table walk variant. So there is no need for expensive indirect function calls. By default the mvcos variant will be called. If the mvcos instruction is not available it will call the page table walk variant. For minimal performance impact the "if (mvcos_is_available)" is implemented with a jump label, which will be a six byte nop on machines with mvcos. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | | s390/compat: add copyright statementHeiko Carstens2014-03-29
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: get rid of compat wrapper assembly codeHeiko Carstens2014-03-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that all compat syscalls have been converted to use the COMPAT_SYSCALL_DEFINE macros, we don't need to compat syscall wrapper assembly code anymore. So remove it and fix up the system call table accordingly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: partial parameter conversion within syscall wrappersHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Parameter conversion within the system call wrappers is only needed for parameters which differ in size and have a size of eight bytes on 64 bit. For system call parameters with a size of less than eight byte the called system call itself will perform parameter conversion anyway. So we can save the double conversion of e.g. int parameters. The only types which need to be converted are therefore pointer and (unsigned) long parameters. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: automatic zero, sign and pointer conversion of syscallsHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of explicitly changing compat system call parameters from e.g. unsigned long to compat_ulong_t let the COMPAT_SYSCALL_WRAP macros automatically detect (unsigned) long parameters and zero and sign extend them automatically. The resulting binary is completely identical. In addition add a sys_[system call name] prototype for each system call wrapper. This will cause compile errors if the prototype does not match the prototype in include/linux/syscall.h. Therefore we should now always get the correct zero and sign extension of system call parameters. Pointers are handled like before. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: add sync_file_range and fallocate compat syscallsHeiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The compat syscall wrappers for sync_file_range and fallocate merged 32 bit parameters into 64 bit parameters. Therefore they did more than just the usual zero and/or sign extension of system call parameters. So convert these two wrappers to full s390 specific compat sytem calls. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 15Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 14Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 13Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 12Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 11Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 10Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 09Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 08Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 07Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 06Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 05Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 04Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 03Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 02Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert system call wrappers to C part 01Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a new compat_wrap.c file which contains the s390 specific compat system call wrappers. The s390 specific system call wrappers only perform sign, zero and pointer conversion of system call arguments before actually calling the non-compat system call. Therefore introduce COMPAT_SYSCALL_WRAPx macros which generate C code that is nearly identical to the assembly code. This has the advantage that the compile will generate correct code, and we avoid the frequent copy-paste errors seen in the compat_wrapper.S file. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 7Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 6Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 5Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 4Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 3Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 2Heiko Carstens2014-03-04
| | | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | | s390/compat: convert to COMPAT_SYSCALL_DEFINEx part 1Heiko Carstens2014-03-04
| |/ / |/| | | | | | | | | | | | | | | | | Convert s390 specific system calls to to the new COMPAT_SYSCALL_DEFINE macro. This allows us to get rid of the assembly compat wrappers. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* | | s390/compat: fix sys_sched_getattr compat wrapperHeiko Carstens2014-02-21
|/ / | | | | | | | | | | | | Fix stupid typo. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2014-02-11
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 bugfixes from Martin Schwidefsky: "A collection a bug fixes. Most of them are minor but two of them are more severe. The linkage stack bug can be used by user space to force an oops, with panic_on_oops this is a denial-of-service. And the dump memory detection issue can cause incomplete memory dumps" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/cio: improve cio_commit_config s390: fix kernel crash due to linkage stack instructions s390/dump: Fix dump memory detection s390/appldata: restore missing init_virt_timer() s390/qdio: correct program-controlled interruption checking s390/qdio: for_each macro correctness
| * s390: fix kernel crash due to linkage stack instructionsMartin Schwidefsky2014-02-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The kernel currently crashes with a low-address-protection exception if a user space process executes an instruction that tries to use the linkage stack. Set the base-ASTE origin and the subspace-ASTE origin of the dispatchable-unit-control-table to point to a dummy ASTE. Set up control register 15 to point to an empty linkage stack with no room left. A user space process with a linkage stack instruction will still crash but with a different exception which is correctly translated to a segmentation fault instead of a kernel oops. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | s390/compat: change parameter types from unsigned long to compat_ulong_tHeiko Carstens2014-01-29
|/ | | | | | | | | | | | | | | | | | | | | Change parameter types of s390's compat ipc syscall from unsigned long to compat_ulong_t to enforce zero extension of these parameters. This is not really a bug, since s390_ipc compat syscall is only a wrapper to the generic compat_sys_ipc() syscall, which performs correct zero and sign extension. This was introduced with commit 56e41d3c5aa8 ("merge compat sys_ipc instances"). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ingo Molnar <mingo@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* s390: wire up sys_sched_setattr/sys_sched_getattrHeiko Carstens2014-01-22
| | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2014-01-20
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Martin Schwidefsky: "The bulk of the s390 updates for v3.14. New features are the perf support for the CPU-Measurement Sample Facility and the EP11 support for the crypto cards. And the normal cleanups and bug-fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (44 commits) s390/cpum_sf: fix printk format warnings s390: Fix misspellings using 'codespell' tool s390/qdio: bridgeport support - CHSC part s390: delete new instances of __cpuinit usage s390/compat: fix PSW32_USER_BITS definition s390/zcrypt: add support for EP11 coprocessor cards s390/mm: optimize randomize_et_dyn for !PF_RANDOMIZE s390: use IS_ENABLED to check if a CONFIG is set to y or m s390/cio: use device_lock to synchronize calls to the ccwgroup driver s390/cio: use device_lock to synchronize calls to the ccw driver s390/cio: fix unlocked access of online member s390/cpum_sf: Add flag to process full SDBs only s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function s390/cpum_sf: Filter perf events based event->attr.exclude_* settings s390/cpum_sf: Detect KVM guest samples s390/cpum_sf: Add helper to read TOD from trailer entries s390/cpum_sf: Atomically reset trailer entry fields of sample-data-blocks s390/cpum_sf: Dynamically extend the sampling buffer if overflows occur s390/pci: reenable per default s390/pci/dma: fix accounting of allocated_pages ...
| * s390/cpum_sf: fix printk format warningsHendrik Brueckner2014-01-16
| | | | | | | | | | Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390: Fix misspellings using 'codespell' toolHendrik Brueckner2014-01-16
| | | | | | | | | | Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390: delete new instances of __cpuinit usagePaul Gortmaker2014-01-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch "s390/perf: add support for the CPU-Measurement Sampling Facility" added a new instance of the __cpuinit macro usage. We removed this a couple versions ago; we now want to remove the compat no-op stubs. Introducing new users is not what we want to see at this point in time, as it will break once the stubs are gone. Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/mm: optimize randomize_et_dyn for !PF_RANDOMIZEMartin Schwidefsky2013-12-18
| | | | | | | | | | | | | | | | Skip the call to brk_rnd() if the PF_RANDOMIZE flag is not set for the process. This avoids the costly get_random_int() call. Modify arch_randomize_brk() as well to make it look like randomize_et_dyn(). Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390: use IS_ENABLED to check if a CONFIG is set to y or mHeiko Carstens2013-12-16
| | | | | | | | | | | | | | | | This is shorter and should be used instead of the longer form which checks for both possible config options. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Add flag to process full SDBs onlyHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the PERF_CPUM_SF_FULL_BLOCKS flag to process only sample-data-blocks that have the block-full-indicator bit set. Sample-data-blocks that are partially filled are discarded. Use this flag if the sampling buffer is likely to be shared among perf events that use different sampling modes. In such environments, flushing sample-data-blocks that are not completely filled, might cause invalid-data-formats. Setting PERF_CPUM_SF_FULL_BLOCKS prevents potentially invalid sampling data to be processed but, in contrast, also discards valid samples in partially filled sample-data-blocks. Note that sample-data-blocks might not become full for small sampling frequencies or for workload that is scheduled for tiny intervals. To sample with the PERF_CPUM_SF_FULL_BLOCKS flag, set the perf->attr.config1 to 0x0004. For example: perf record -e cpum_sf/config=0xB000,config1=0x0004/ Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling functionHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Also support the diagnostic-sampling function in addition to the basic-sampling function. Diagnostic-sampling data entries contain hardware model specific sampling data and additional programs are required to analyze the data. To deliver diagnostic-sampling, as well, as basis-sampling data entries to user space, introduce support for sampling "raw data". If this particular perf sampling type (PERF_SAMPLE_RAW) is used, sampling data entries are copied to user space. External programs can then analyze these data. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Filter perf events based event->attr.exclude_* settingsHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | Introduce the perf_exclude_event() function to filter perf samples according to event->attr.exclude_* settings. During event initialization, reset event exclude settings that are not supported. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Detect KVM guest samplesHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The host-program-parameter (hpp) value of basic sample-data-entries designates a SIE control block that is set by the LPP instruction in sie64a(). Non-zero values indicate guest samples, a value of zero indicates a host sample. For perf samples, host and guest samples are distinguished using particular PERF_MISC_* flags. The perf layer calls perf_misc_flags() to set the flags based on the pt_regs content. For each sample-data-entry, the cpum_sf PMU creates a pt_regs structure with the sample-data information. An additional flag structure is added to easily distinguish between host and guest samples. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Add helper to read TOD from trailer entriesHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | The trailer entry contains a timestamp of the time when the sample-data-block became full. The timestamp specifies a TOD (time-of-day) value in either the STCK or STCKE format. Provide a helper function to return the TOD value depending on the setting of time format indicator. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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