linux-toradex.git/arch/powerpc/kernel/perf_event_fsl_emb.c, branch v3.2.34

perf: Remove the nmi parameter from the swevent and overflow interface

2011-07-01T09:06:35+00:00

The nmi parameter indicated if we could do wakeups from the current
context, if not, we would set some state and self-IPI and let the
resulting interrupt do the wakeup.

For the various event classes:

  - hardware: nmi=0; PMI is in fact an NMI or we run irq_work_run from
    the PMI-tail (ARM etc.)
  - tracepoint: nmi=0; since tracepoint could be from NMI context.
  - software: nmi=[0,1]; some, like the schedule thing cannot
    perform wakeups, and hence need 0.

As one can see, there is very little nmi=1 usage, and the down-side of
not using it is that on some platforms some software events can have a
jiffy delay in wakeup (when arch_irq_work_raise isn't implemented).

The up-side however is that we can remove the nmi parameter and save a
bunch of conditionals in fast paths.

Signed-off-by: Peter Zijlstra 
Cc: Michael Cree 
Cc: Will Deacon 
Cc: Deng-Cheng Zhu 
Cc: Anton Blanchard 
Cc: Eric B Munson 
Cc: Heiko Carstens 
Cc: Paul Mundt 
Cc: David S. Miller 
Cc: Frederic Weisbecker 
Cc: Jason Wessel 
Cc: Don Zickus 
Link: http://lkml.kernel.org/n/tip-agjev8eu666tvknpb3iaj0fg@git.kernel.org
Signed-off-by: Ingo Molnar

powerpc, perf: Fix frequency calculation for overflowing counters (FSL version)

2011-01-19T19:05:42+00:00

When fixing the frequency calculations for perf on powerpc I
forgot to fix the FSL version.

If we dont set event->hw.last_period the frequency to period
calculations in perf go haywire and we continually
throttle/unthrottle the PMU.

Signed-off-by: Anton Blanchard 
Acked-by: Benjamin Herrenschmidt 
Cc: Scott Wood 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Peter Zijlstra 
LKML-Reference: <20110118214404.2f42e634@kryten>
Signed-off-by: Ingo Molnar

perf: Dynamic pmu types

2010-12-16T10:36:43+00:00

Extend the perf_pmu_register() interface to allow for named and
dynamic pmu types.

Because we need to support the existing static types we cannot use
dynamic types for everything, hence provide a type argument.

If we want to enumerate the PMUs they need a name, provide one.

Signed-off-by: Peter Zijlstra 
LKML-Reference: <20101117222056.259707703@chello.nl>
Signed-off-by: Ingo Molnar

perf: Rework the PMU methods

2010-09-09T18:46:30+00:00

Replace pmu::{enable,disable,start,stop,unthrottle} with
pmu::{add,del,start,stop}, all of which take a flags argument.

The new interface extends the capability to stop a counter while
keeping it scheduled on the PMU. We replace the throttled state with
the generic stopped state.

This also allows us to efficiently stop/start counters over certain
code paths (like IRQ handlers).

It also allows scheduling a counter without it starting, allowing for
a generic frozen state (useful for rotating stopped counters).

The stopped state is implemented in two different ways, depending on
how the architecture implemented the throttled state:

 1) We disable the counter:
    a) the pmu has per-counter enable bits, we flip that
    b) we program a NOP event, preserving the counter state

 2) We store the counter state and ignore all read/overflow events

Signed-off-by: Peter Zijlstra 
Cc: paulus 
Cc: stephane eranian 
Cc: Robert Richter 
Cc: Will Deacon 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Cyrill Gorcunov 
Cc: Lin Ming 
Cc: Yanmin 
Cc: Deng-Cheng Zhu 
Cc: David Miller 
Cc: Michael Cree 
LKML-Reference: 
Signed-off-by: Ingo Molnar

perf: Per PMU disable

2010-09-09T18:46:29+00:00

Changes perf_disable() into perf_pmu_disable().

Signed-off-by: Peter Zijlstra 
Cc: paulus 
Cc: stephane eranian 
Cc: Robert Richter 
Cc: Will Deacon 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Cyrill Gorcunov 
Cc: Lin Ming 
Cc: Yanmin 
Cc: Deng-Cheng Zhu 
Cc: David Miller 
Cc: Michael Cree 
LKML-Reference: 
Signed-off-by: Ingo Molnar

perf: Reduce perf_disable() usage

2010-09-09T18:46:29+00:00

Since the current perf_disable() usage is only an optimization,
remove it for now. This eases the removal of the __weak
hw_perf_enable() interface.

Signed-off-by: Peter Zijlstra 
Cc: paulus 
Cc: stephane eranian 
Cc: Robert Richter 
Cc: Will Deacon 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Cyrill Gorcunov 
Cc: Lin Ming 
Cc: Yanmin 
Cc: Deng-Cheng Zhu 
Cc: David Miller 
Cc: Michael Cree 
LKML-Reference: 
Signed-off-by: Ingo Molnar

perf: Register PMU implementations

2010-09-09T18:46:28+00:00

Simple registration interface for struct pmu, this provides the
infrastructure for removing all the weak functions.

Signed-off-by: Peter Zijlstra 
Cc: paulus 
Cc: stephane eranian 
Cc: Robert Richter 
Cc: Will Deacon 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Cyrill Gorcunov 
Cc: Lin Ming 
Cc: Yanmin 
Cc: Deng-Cheng Zhu 
Cc: David Miller 
Cc: Michael Cree 
LKML-Reference: 
Signed-off-by: Ingo Molnar

perf: Deconstify struct pmu

2010-09-09T18:46:27+00:00

sed -ie 's/const struct pmu\>/struct pmu/g' `git grep -l "const struct pmu\>"`

Signed-off-by: Peter Zijlstra 
Cc: paulus 
Cc: stephane eranian 
Cc: Robert Richter 
Cc: Will Deacon 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Cyrill Gorcunov 
Cc: Lin Ming 
Cc: Yanmin 
Cc: Deng-Cheng Zhu 
Cc: David Miller 
Cc: Michael Cree 
LKML-Reference: 
Signed-off-by: Ingo Molnar

perf, powerpc: fsl_emb: Restore setting perf_sample_data.period

2010-08-03T00:56:45+00:00

Commit 6b95ed345b9faa4ab3598a82991968f2e9f851bb changed from
a struct initializer to perf_sample_data_init(), but the setting
of the .period member was left out.

Signed-off-by: Scott Wood 
Cc: stable@kernel.org
Signed-off-by: Paul Mackerras

perf, powerpc: Convert the FSL driver to use local64_t

2010-08-03T00:24:03+00:00

For some reason the FSL driver got left out when we converted perf
to use local64_t instead of atomic64_t.

Signed-off-by: Peter Zijlstra 
Acked-by: Kumar Gala 
Signed-off-by: Paul Mackerras