BMC/Intel-BMC/linux.git/arch/s390/include/asm/cpu_mf.h, branch dev

s390: add SMT support

2015-01-22T11:16:01+00:00

The multi-threading facility is introduced with the z13 processor family. This patch adds code to detect the multi-threading facility. With the facility enabled each core will surface multiple hardware threads to the system. Each hardware threads looks like a normal CPU to the operating system with all its registers and properties. The SCLP interface reports the SMT topology indirectly via the maximum thread id. Each reported CPU in the result of a read-scp-information is a core representing a number of hardware threads. To reflect the reduced CPU capacity if two hardware threads run on a single core the MT utilization counter set is used to normalize the raw cputime obtained by the CPU timer deltas. This scaled cputime is reported via the taskstats interface. The normal /proc/stat numbers are based on the raw cputime and are not affected by the normalization. Signed-off-by: Martin Schwidefsky

s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function

2013-12-16T13:38:00+00:00

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 Signed-off-by: Martin Schwidefsky

s390/cpum_sf: Add helper to read TOD from trailer entries

2013-12-16T13:37:58+00:00

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 Signed-off-by: Martin Schwidefsky

s390/cpum_sf: Atomically reset trailer entry fields of sample-data-blocks

2013-12-16T13:37:57+00:00

Ensure to reset the sample-data-block full indicator and the overflow counter at the same time. This must be done atomically because the sampling hardware is still active while full sample-data-block is processed. Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky

s390/perf: add support for the CPU-Measurement Sampling Facility

2013-12-16T13:37:51+00:00

Introduce a perf PMU, "cpum_sf", to support the CPU-Measurement Sampling Facility. You can control the sampling facility through this perf PMU interfaces. Perf sampling events are created for hardware samples. For details about the CPU-Measurement Sampling Facility, see "The Load-Program-Parameter and the CPU-Measurement Facilities" (SA23-2260). Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky

s390/oprofile: move hwsampler interfaces to cpu_mf.h

2013-12-16T13:37:50+00:00

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 Signed-off-by: Martin Schwidefsky

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-03-11T14:54:29+00:00

Pull perf fixes from Ingo Molnar: "Misc minor fixes mostly related to tracing" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: s390: Fix a header dependencies related build error tracing: update documentation of snapshot utility tracing: Do not return EINVAL in snapshot when not allocated tracing: Add help of snapshot feature when snapshot is empty ftrace: Update the kconfig for DYNAMIC_FTRACE

s390: Fix a header dependencies related build error

2013-03-11T09:43:35+00:00

Commit 877c685607925238e302cd3aa38788dca6c1b226 ("perf: Remove include of cgroup.h from perf_event.h") caused this build failure if PERF_EVENTS is enabled: In file included from arch/s390/include/asm/perf_event.h:9:0, from include/linux/perf_event.h:24, from kernel/events/ring_buffer.c:12: arch/s390/include/asm/cpu_mf.h: In function 'qctri': arch/s390/include/asm/cpu_mf.h:61:12: error: 'EINVAL' undeclared (first use in this function) cpu_mf.h had an implicit errno.h dependency, which was added indirectly via cgroups.h but not anymore. Add it explicitly. Reported-by: Fengguang Wu Tested-by: Fengguang Wu Signed-off-by: Li Zefan Cc: Martin Schwidefsky Cc: Heiko Carstens Link: http://lkml.kernel.org/r/51385F79.7000106@huawei.com Signed-off-by: Ingo Molnar

s390/cleanup: rename SPP to LPP

2013-02-14T14:55:24+00:00

The set-program-parameter (SPP) instruction has been renamed to load-program-parameter (LPP) (see SA23-2260). Reflect this change and rename all macro/instruction references. Also remove the duplicate SPP/LPP entry in the kernel disassembler instruction list. Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky

s390: add support for runtime instrumentation

2012-09-26T13:45:02+00:00

Allow user-space threads to use runtime instrumentation (RI). To enable RI for a thread there is a new s390 specific system call, sys_s390_runtime_instr, that takes as parameter a realtime signal number. If the RI facility is available the system call sets up a control block for the calling thread with the appropriate permissions for the thread to modify the control block. The user-space thread can then use the store and modify RI instructions to alter the control block and start/stop the instrumentation via RION/RIOFF. If the user specified program buffer runs full RI triggers an external interrupt. The external interrupt is translated to a real-time signal that is delivered to the thread that enabled RI on that CPU. The number of the real-time signal is the number specified in the RI system call. So, user-space can select any available real-time signal number in case the application itself uses real-time signals for other purposes. The kernel saves the RI control blocks on task switch only if the running thread was enabled for RI. Therefore, the performance impact on task switch should be negligible if RI is not used. RI is only enabled for user-space mode and is disabled for the supervisor state. Reviewed-by: Heiko Carstens Signed-off-by: Jan Glauber Signed-off-by: Martin Schwidefsky