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2016-10-17s390/dumpstack: restore reliable indicator for call tracesHeiko Carstens1-1/+1
Before merging all different stack tracers the call traces printed had an indicator if an entry can be considered reliable or not. Unreliable entries were put in braces, reliable not. Currently all lines contain these extra braces. This patch restores the old behaviour by adding an extra "reliable" parameter to the callback functions. Only show_trace makes currently use of it. Before: [ 0.804751] Call Trace: [ 0.804753] ([<000000000017d0e0>] try_to_wake_up+0x318/0x5e0) [ 0.804756] ([<0000000000161d64>] create_worker+0x174/0x1c0) After: [ 0.804751] Call Trace: [ 0.804753] ([<000000000017d0e0>] try_to_wake_up+0x318/0x5e0) [ 0.804756] [<0000000000161d64>] create_worker+0x174/0x1c0 Fixes: 758d39ebd3d5 ("s390/dumpstack: merge all four stack tracers") Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-06-28s390/oprofile: remove hardware sampler supportHeiko Carstens5-1752/+0
Remove hardware sampler support from oprofile module. The oprofile user space utilty has been switched to use the kernel perf interface, for which we also provide hardware sampling support. In addition the hardware sampling support is also slightly broken: it supports only 16 bits for the pid and therefore would generate wrong results on machines which have a pid >64k. Also the pt_regs structure which was passed to oprofile common code cannot necessarily be used to generate sane backtraces, since the task(s) in question may run while the samples are fed to oprofile. So the result would be more or less random. However given that the only user space tools switched to the perf interface already four years ago the hardware sampler code seems to be unused code, and therefore it should be reasonable to remove it. The timer based oprofile support continues to work. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Andreas Arnez <arnez@linux.vnet.ibm.com> Acked-by: Andreas Krebbel <krebbel@linux.vnet.ibm.com> Acked-by: Robert Richter <rric@kernel.org> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-02-24s390/oprofile: add z13/z13s model numbersHeiko Carstens1-0/+1
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-02-23s390/dumpstack: merge all four stack tracersHeiko Carstens3-81/+19
We have four different stack tracers of which three had bugs. So it's time to merge them to a single stack tracer which allows to specify a call back function which will be called for each step. This patch changes behavior a bit: - the "nosched" and "in_sched_functions" check within save_stack_trace_tsk did work only for the last stack frame within a context. Now it considers the check for each stack frame like it should. - both the oprofile variant and the perf_events variant did save a return address twice if a zero back chain was detected, which indicates an interrupt frame. The new dump_trace function will call the oprofile and perf_events backends with the psw address that is contained within the corresponding pt_regs structure instead. - the original show_trace and save_context_stack functions did already use the psw address of the pt_regs structure if a zero back chain was detected. However now we ignore the psw address if it is a user space address. After all we trace the kernel stack and not the user space stack. This way we also get rid of the garbage user space address in case of warnings and / or panic call traces. So this should make life easier since now there is only one stack tracer left which we can break. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-02-10s390/oprofile: fix address range for asynchronous stackHeiko Carstens1-3/+5
git commit dc7ee00d4771 ("s390: lowcore stack pointer offsets") introduced a regression in regard to s390_backtrace(). The stack pointer for the asynchronous stack in the lowcore now has an additional offset applied. This offset needs to be taken into account in the calculation for the low and high address for the stack. This bug was already partially fixed with commit 9cc5c206d9b4 ("s390/dumpstack: fix address ranges for asynchronous and panic stack"). This patch fixes it also for the oprofile code. Fixes: dc7ee00d4771 ("s390: lowcore stack pointer offsets") Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-01-19s390: remove all usages of PSW_ADDR_INSNHeiko Carstens1-5/+4
Yet another leftover from the 31 bit era. The usual operation "y = x & PSW_ADDR_INSN" with the PSW_ADDR_INSN mask is a nop for CONFIG_64BIT. Therefore remove all usages and hope the code is a bit less confusing. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
2015-07-01s390/oprofile: fix compile errorSebastian Ott1-0/+1
Fix these errors when compiling with CONFIG_OPROFILE=y and CONFIG_PERF_EVENTS=n: arch/s390/oprofile/init.c: In function ‘oprofile_hwsampler_start’: arch/s390/oprofile/init.c:93:2: error: implicit declaration of function 'perf_reserve_sampling' [-Werror=implicit-function-declaration] retval = perf_reserve_sampling(); ^ arch/s390/oprofile/init.c:99:3: error: implicit declaration of function 'perf_release_sampling' [-Werror=implicit-function-declaration] perf_release_sampling(); ^ Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-03-25s390: remove 31 bit supportHeiko Carstens2-12/+1
Remove the 31 bit support in order to reduce maintenance cost and effectively remove dead code. Since a couple of years there is no distribution left that comes with a 31 bit kernel. The 31 bit kernel also has been broken since more than a year before anybody noticed. In addition I added a removal warning to the kernel shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning message") which let everybody know about the plan to remove 31 bit code. We didn't get any response. Given that the last 31 bit only machine was introduced in 1999 let's remove the code. Anybody with 31 bit user space code can still use the compat mode. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-08-26s390: Replace __get_cpu_var usesChristoph Lameter1-1/+1
__get_cpu_var() is used for multiple purposes in the kernel source. One of them is address calculation via the form &__get_cpu_var(x). This calculates the address for the instance of the percpu variable of the current processor based on an offset. Other use cases are for storing and retrieving data from the current processors percpu area. __get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment. __get_cpu_var() is defined as : #define __get_cpu_var(var) (*this_cpu_ptr(&(var))) __get_cpu_var() always only does an address determination. However, store and retrieve operations could use a segment prefix (or global register on other platforms) to avoid the address calculation. this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use optimized assembly code to read and write per cpu variables. This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr() or into a use of this_cpu operations that use the offset. Thereby address calculations are avoided and less registers are used when code is generated. At the end of the patch set all uses of __get_cpu_var have been removed so the macro is removed too. The patch set includes passes over all arches as well. Once these operations are used throughout then specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by f.e. using a global register that may be set to the per cpu base. Transformations done to __get_cpu_var() 1. Determine the address of the percpu instance of the current processor. DEFINE_PER_CPU(int, y); int *x = &__get_cpu_var(y); Converts to int *x = this_cpu_ptr(&y); 2. Same as #1 but this time an array structure is involved. DEFINE_PER_CPU(int, y[20]); int *x = __get_cpu_var(y); Converts to int *x = this_cpu_ptr(y); 3. Retrieve the content of the current processors instance of a per cpu variable. DEFINE_PER_CPU(int, y); int x = __get_cpu_var(y) Converts to int x = __this_cpu_read(y); 4. Retrieve the content of a percpu struct DEFINE_PER_CPU(struct mystruct, y); struct mystruct x = __get_cpu_var(y); Converts to memcpy(&x, this_cpu_ptr(&y), sizeof(x)); 5. Assignment to a per cpu variable DEFINE_PER_CPU(int, y) __get_cpu_var(y) = x; Converts to this_cpu_write(y, x); 6. Increment/Decrement etc of a per cpu variable DEFINE_PER_CPU(int, y); __get_cpu_var(y)++ Converts to this_cpu_inc(y) Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> CC: linux390@de.ibm.com Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-05-27s390/oprofile: make return of 0 explicitJulia Lawall1-10/+4
Delete unnecessary local variable whose value is always 0 and that hides the fact that the result is always 0. A simplified version of the semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r exists@ local idexpression ret; expression e; position p; @@ -ret = 0; ... when != ret = e return - ret + 0 ; // </smpl> [heiko.carstens: turn prepare_cpu_buffers into a void returning function] Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-04-03s390/irq: Use defines for external interruption codesThomas Huth1-2/+2
Use the new defines for external interruption codes to get rid of "magic" numbers in the s390 source code. And while we're at it, also rename the (un-)register_external_interrupt function to something shorter so that this patch does not exceed the 80 columns all over the place. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-12-16s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling functionHendrik Brueckner1-2/+2
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>
2013-12-16s390/perf,oprofile: Share sampling facilityHendrik Brueckner2-3/+27
Introduce reserve/release functions to share the sampling facility between perf and oprofile. Also improve error handling for the sampling facility support in perf. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-12-16s390/oprofile: move hwsampler interfaces to cpu_mf.hHendrik Brueckner2-115/+4
Extract and move the oprofile hwsampler data structures and interfaces to the cpu_mf.h header file which contains common interface definitions for the various CPU-measurement facilities. This change is necessary for a new perf PMU. Few interface names have been revised to fit to the latest CPU-measurement facilities documentation. Also declare the data structures as __packed and correct checkpatch findings. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-09-11Merge branch 'for-linus' of ↵Linus Torvalds1-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull more s390 updates from Heiko Carstens: "This includes one bpf/jit bug fix where the jit compiler could sometimes write generated code out of bounds of the allocated memory area. The rest of the patches are only cleanups and minor improvements" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/irq: reduce size of external interrupt handler hash array s390/compat,uid16: use current_cred() s390/ap_bus: use and-mask instead of a cast s390/ftrace: avoid pointer arithmetics with function pointers s390: make various functions static, add declarations to header files s390/compat signal: add couple of __force annotations s390/mm: add __releases()/__acquires() annotations to gmap_alloc_table() s390: keep Kconfig sorted s390/irq: rework irq subclass handling s390/irq: use hlists for external interrupt handler array s390/dumpstack: convert print_symbol to %pSR s390/perf: Remove print_hex_dump_bytes() debug output s390: update defconfig s390/bpf,jit: fix address randomization
2013-09-04s390/irq: rework irq subclass handlingHeiko Carstens1-3/+3
Let's not add a function for every external interrupt subclass for which we need reference counting. Just have two register/unregister functions which have a subclass parameter: void irq_subclass_register(enum irq_subclass subclass); void irq_subclass_unregister(enum irq_subclass subclass); Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2013-09-04oprofilefs_create_...() do not need superblock argumentAl Viro1-13/+13
same story as with oprofilefs_mkdir() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-04oprofilefs_mkdir() doesn't need superblock argumentAl Viro1-3/+3
it's always equal to ->d_sb of the second argument (parent dentry), due to either being literally that, or ->d_sb of parent's parent. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-04oprofile: don't bother with passing superblock to ->create_files()Al Viro1-18/+17
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-07-26s390: add support for IBM zBC12 machineHeiko Carstens1-1/+1
Just add the new model number where appropiate. Cc: stable@vger.kernel.org # v3.10 Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-07-01s390/hwsampler: Updated misleading member names in hws_data_entryHendrik Brueckner1-2/+2
There is a misleading naming of the program parameter fields, so correct them according to their names as outlined in "The Load-Program-Parameter and the CPU-measurement Facilities" (SA23-2260-03). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-04-06oprofile, s390: Add support for IBM zEnterprise EC12Andreas Krebbel1-0/+1
This patch adds support for the latest release of the IBM mainframe series - the IBM zEnterprise EC12 (zEC12). The CPU measurement facility didn't change. So only the new CPU type has to be tolerated. Signed-off-by: Andreas Krebbel <krebbel@linux.vnet.ibm.com> Signed-off-by: Robert Richter <rric@kernel.org>
2013-01-08s390/irq: remove split irq fields from /proc/statHeiko Carstens1-1/+1
Now that irq sum accounting for /proc/stat's "intr" line works again we have the oddity that the sum field (first field) contains only the sum of the second (external irqs) and third field (I/O interrupts). The reason for that is that these two fields are already sums of all other fields. So if we would sum up everything we would count every interrupt twice. This is broken since the split interrupt accounting was merged two years ago: 052ff461c8427629aee887ccc27478fc7373237c "[S390] irq: have detailed statistics for interrupt types". To fix this remove the split interrupt fields from /proc/stat's "intr" line again and only have them in /proc/interrupts. This restores the old behaviour, seems to be the only sane fix and mimics a behaviour from other architectures where /proc/interrupts also contains more than /proc/stat's "intr" line does. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-08-27oprofile, s390: Fix uninitialized memory access when writing to oprofilefsRobert Richter1-5/+5
If oprofilefs_ulong_from_user() is called with count equals zero, *val remains unchanged. Depending on the implementation it might be uninitialized. Fixing users of oprofilefs_ulong_ from_user(). We missed these s390 changes with: 913050b oprofile: Fix uninitialized memory access when writing to writing to oprofilefs Cc: stable@vger.kernel.org # 3.3+ Signed-off-by: Robert Richter <robert.richter@amd.com>
2012-07-30s390: make use of user_mode() macro where possibleHeiko Carstens1-1/+1
We use the user_mode() helper already at several places but also have the open coded variant at other places. Convert the code to always use the helper function. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-07-20s390/comments: unify copyright messages and remove file namesHeiko Carstens4-15/+7
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2012-05-23s390/irq: split irq stats for cpu-measurement alert facilitiesHendrik Brueckner1-1/+1
CPU-measurement alerts are generated for different CPU-measurement facilities, for example, the sampling and counter facilities. Split the irq stats according to available facilities. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-03-29Merge tag 'split-asm_system_h-for-linus-20120328' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
2012-03-28Disintegrate asm/system.h for S390David Howells1-0/+1
Disintegrate asm/system.h for S390. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-s390@vger.kernel.org
2012-03-23[S390] oprofile: Allow multiple users of the measurement alert interruptJan Glauber1-30/+22
Prepare the measurement facility which is currently only used by oprofile for multiple users. To achieve that the measurement alert interrupt control bit needs to be protected. The measurement alert definitions are moved to a header file and an interrupt mask is added so that users can discard interrupts if they are for a different measurement subsystem. Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-03-11[S390] irq: external interrupt code passingHeiko Carstens1-3/+3
The external interrupt handlers have a parameter called ext_int_code. Besides the name this paramter does not only contain the ext_int_code but in addition also the "cpu address" (POP) which caused the external interrupt. To make the code a bit more obvious pass a struct instead so the called function can easily distinguish between external interrupt code and cpu address. The cpu address field however is named "subcode" since some external interrupt sources do not pass a cpu address but a different parameter (or none at all). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-01-06Merge branch 'perf-core-for-linus' of ↵Linus Torvalds3-31/+372
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (106 commits) perf kvm: Fix copy & paste error in description perf script: Kill script_spec__delete perf top: Fix a memory leak perf stat: Introduce get_ratio_color() helper perf session: Remove impossible condition check perf tools: Fix feature-bits rework fallout, remove unused variable perf script: Add generic perl handler to process events perf tools: Use for_each_set_bit() to iterate over feature flags perf tools: Unify handling of features when writing feature section perf report: Accept fifos as input file perf tools: Moving code in some files perf tools: Fix out-of-bound access to struct perf_session perf tools: Continue processing header on unknown features perf tools: Improve macros for struct feature_ops perf: builtin-record: Document and check that mmap_pages must be a power of two. perf: builtin-record: Provide advice if mmap'ing fails with EPERM. perf tools: Fix truncated annotation perf script: look up thread using tid instead of pid perf tools: Look up thread names for system wide profiling perf tools: Fix comm for processes with named threads ...
2011-12-20Merge branch 'for-tip' of ↵Ingo Molnar3-31/+372
git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile into perf/core
2011-12-19oprofile: Fix uninitialized memory access when writing to writing to oprofilefsRobert Richter1-1/+1
If oprofilefs_ulong_from_user() is called with count equals zero, *val remains unchanged. Depending on the implementation it might be uninitialized. Change oprofilefs_ulong_from_user()'s interface to return count on success. Thus, we are able to return early if count equals zero which avoids using *val uninitialized. Fixing all users of oprofilefs_ulong_ from_user(). This follows write syscall implementation when count is zero: "If count is zero ... [and if] no errors are detected, 0 will be returned without causing any other effect." (man 2 write) Reported-By: Mike Waychison <mikew@google.com> Signed-off-by: Robert Richter <robert.richter@amd.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@vger.kernel.org> Cc: oprofile-list <oprofile-list@lists.sourceforge.net> Link: http://lkml.kernel.org/r/20111219153830.GH16765@erda.amd.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-12-07oprofile, s390: Add event interface to the System z hardware sampling moduleAndreas Krebbel3-30/+372
With this patch the OProfile Basic Mode Sampling support for System z is enhanced with a counter file system. That way hardware sampling can be configured using the user space tools with only little modifications. With the patch by default new cpu_types (s390/z10, s390/z196) are returned in order to indicate that we are running a CPU which provides the hardware sampling facility. Existing user space tools will complain about an unknown cpu type. In order to be compatible with existing user space tools the `cpu_type' module parameter has been added. Setting the parameter to `timer' will force the module to return `timer' as cpu_type. The module will still try to use hardware sampling if available and the hwsampling virtual filesystem will be also be available for configuration. So this has a different effect than using the generic oprofile module parameter `timer=1'. If the basic mode sampling is enabled on the machine and the cpu_type=timer parameter is not used the kernel module will provide the following virtual filesystem: /dev/oprofile/0/enabled /dev/oprofile/0/event /dev/oprofile/0/count /dev/oprofile/0/unit_mask /dev/oprofile/0/kernel /dev/oprofile/0/user In the counter file system only the values of 'enabled', 'count', 'kernel', and 'user' are evaluated by the kernel module. Everything else must contain fixed values. The 'event' value only supports a single event - HWSAMPLING with value 0. The 'count' value specifies the hardware sampling rate as it is passed to the CPU measurement facility. The 'kernel' and 'user' flags can now be used to filter for samples when using hardware sampling. Additionally also the following file will be created: /dev/oprofile/timer/enabled This will always be the inverted value of /dev/oprofile/0/enabled. 0 is not accepted without hardware sampling. Signed-off-by: Andreas Krebbel <krebbel@linux.vnet.ibm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2011-12-07oprofile: Fix oprofile_timer_exit() breakageRobert Richter1-1/+0
Removing remainings of oprofile_timer_exit() completly. Signed-off-by: Robert Richter <robert.richter@amd.com>
2011-10-30[S390] sparse: fix sparse ANSI-C warningsMartin Schwidefsky1-4/+4
Fix prototype of some functions in arch/s390/oprofile to avoid non-ANSI warnings from sparse. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-07-11Merge branch 'master' into for-nextJiri Kosina1-1/+7
Sync with Linus' tree to be able to apply pending patches that are based on newer code already present upstream.
2011-06-22[S390] hwsampler: Set a sane default sampling rateChristian Borntraeger1-1/+1
The sampling interval for the hardware sampler is specified in cycles. (see SA23-2260-01 The Load-Program-Parameter and the CPU-Measurement Facilities) The current default value will therefore result in millions of samples. This patch changes the default sampling interval to 4M, which will result in ~1500 samples per second on a z196 reducing the overhead of sampling. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-06-22[S390] s390: enforce HW limits for the initial sampling rateChristian Borntraeger1-0/+6
On specific configurations with hwsampler opcontrol --start returns an error on "echo 1 >/dev/oprofile/enable". Turns out that the hw sampling interval is not checked against the hardware limits. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-06-20treewide: remove duplicate includesVitaliy Ivanov1-2/+0
Many stupid corrections of duplicated includes based on the output of scripts/checkincludes.pl. Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-05-26[S390] hwsampler: allow cpu hotplugMartin Schwidefsky1-1/+1
The hardware sample cpu hotplug notifier always returns NOTIFY_BAD. That will prevent cpu hotplug if the machine is enabled for hardware sampling even if it is not used. Fix the cpu hotplug notifier and allow cpu hotplug if hardware sampling is unused. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2011-05-26[S390] irq: merge irq.c and s390_ext.cHeiko Carstens1-1/+1
Merge irq.c and s390_ext.c into irq.c. That way all external interrupt related functions are together. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-05-23[S390] oprofile: dont access lowcoreHeiko Carstens1-9/+2
The external interrupt parameter is passed as function call parameter. No need to access lowcore. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2011-05-23[S390] oprofile: add missing irq stats counterHeiko Carstens1-0/+2
Count CPU measurement external interrupts as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2011-05-23[S390] s390,oprofile: fix compile error for !CONFIG_SMPJan Glauber1-3/+3
Use ctl_set_bit instead of the smp_ctl_set_bit (likewise for clear bit) to prevent the following build error for !CONFIG_SMP: CC arch/s390/oprofile/hwsampler.o arch/s390/oprofile/hwsampler.c: In function ‘hwsampler_deallocate’: arch/s390/oprofile/hwsampler.c:1012: error: implicit declaration of function ‘smp_ctl_clear_bit’ arch/s390/oprofile/hwsampler.c: In function ‘hwsampler_start_all’: arch/s390/oprofile/hwsampler.c:1201: error: implicit declaration of function ‘smp_ctl_set_bit’ CC kernel/seccomp.o make[1]: *** [arch/s390/oprofile/hwsampler.o] Error 1 make: *** [arch/s390/oprofile] Error 2 Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-05-23[S390] s390,oprofile: fix alert counter incrementJan Glauber1-1/+1
The counter for requested interrupts should be incremented if the program-request-alert bit is set and not the invalid-address-entry bit. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-05-10[S390] oprofile: fix min/max interval query checksMartin Schwidefsky3-18/+8
oprofile_min_interval and oprofile_max_interval are unsigned, checking for negative values doesn't work. Change hwsampler_query_min_interval and hwsampler_query_max_interval to return an unsigned long and check for a zero value instead. Reported-by: Nicolas Kaiser <nikai@nikai.net> Acked-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-04-04[S390] oprofile s390: prevent stack corruptionJan Glauber1-5/+1
Prevent stack corruption by memcpy which copies more bytes then available at the destination. While at it use the new test_facility to test for the facility bit. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-03-23[S390] oprofile: disable hw sampling for CONFIG_32BITHeiko Carstens2-3/+15
Doesn't work and build for CONFIG_32BIT. So disable it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>