linux.git/arch/arm/kernel/perf_event_cpu.c, branch v3.15

ARM: perf: add support for the Cortex-A12 PMU

2014-02-21T11:11:23+00:00

Cortex-A12 implements Performance Monitors compliant with the PMUv2
architecture.

This patch adds support for the Cortex-A12 PMU to the ARM perf backend.

Signed-off-by: Albin Tonnerre 
Signed-off-by: Will Deacon

ARM: perf: remove unused PMU probing code

2014-02-21T11:11:22+00:00

The ARM perf backend can discover the type of PMU it needs to drive
either from DT or by probing a CPU it is running on. For
Cortex-A{5,7,15} there are no platforms in mainline not using dt, and
this probing won't work well for big.LITTLE systems with heterogeneous
PMUs.

This patch drops the probing for those CPUs, relying on information from
dt instead. Future platforms should describe their PMU(s) with dt.

Suggested-by: Will Deacon 
Signed-off-by: Mark Rutland 
Signed-off-by: Will Deacon

ARM: perf: add basic support for Krait CPU PMUs

2014-02-21T11:11:02+00:00

Add basic support for the Krait CPU PMU. This allows us to use
the architected functionality of the PMU.

This is based on code originally written by Ashwin Chaugule and
Neil Leeder [1].

[1] https://www.codeaurora.org/cgit/quic/la/kernel/msm/tree/arch/arm/kernel/perf_event_msm_krait.c?h=msm-3.4

Cc: Neil Leeder 
Cc: Ashwin Chaugule 
Signed-off-by: Stephen Boyd 
Signed-off-by: Will Deacon

ARM: perf: assign pdev pointer earlier for CPU PMUs

2014-02-21T11:10:52+00:00

We want to inspect the of_node that the pdev is pointing to in
the Krait CPU specific PMU initialization function. Assign it
earlier so that we don't crash with a NULL pointer dereference.

Signed-off-by: Stephen Boyd 
Signed-off-by: Will Deacon

ARM: perf: support percpu irqs for the CPU PMU

2014-02-21T11:10:44+00:00

Some CPU PMUs are wired up with one PPI for all the CPUs instead
of with a different SPI for each CPU. Add support for these
devices.

Signed-off-by: Stephen Boyd 
Signed-off-by: Will Deacon

ARM: 7937/1: perf_event: Silence sparse warning

2014-01-11T12:06:58+00:00

arch/arm/kernel/perf_event_cpu.c:274:25: warning: incorrect type in assignment (different modifiers)
arch/arm/kernel/perf_event_cpu.c:274:25: expected int ( *init_fn )( ... )
arch/arm/kernel/perf_event_cpu.c:274:25: got void const *const data

Acked-by: Will Deacon 
Signed-off-by: Stephen Boyd 
Signed-off-by: Russell King

ARM: 7862/1: pcpu: replace __get_cpu_var_uses

2013-10-29T11:06:27+00:00

This is the ARM part of Christoph's patchset cleaning up the various
uses of __get_cpu_var across the tree.

The idea is to convert __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 fewer
registers are used when code is generated.

[will: fixed debug ref counting checks and pcpu array accesses]

Acked-by: Catalin Marinas 
Signed-off-by: Christoph Lameter 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 7813/1: Mark pmu interupt IRQF_NO_THREAD

2013-08-19T23:12:23+00:00

PMU interrupts must not be threaded.

Acked-by: Will Deacon 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Russell King

arm: delete cpuinit/CPUINIT usage from all ARM users

2013-07-14T23:36:52+00:00

The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit  -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings.  In any case, they are temporary and harmless.

This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code.  It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: Russell King 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker

ARM: perf: handle armpmu_register failing

2013-01-18T13:46:09+00:00

Currently perf_pmu_register may fail for several reasons (e.g. being
unable to allocate memory for the struct device it associates with each
PMU), and while any error is propagated by armpmu_register, it is
ignored by cpu_pmu_device_probe and not propagated to the caller.  This
also results in a leak of a struct arm_pmu.

This patch adds cleanup if armpmu_register fails, and updates the info
messages to better differentiate this type of failure from a failure to
probe the PMU type from the hardware or dt.

Signed-off-by: Mark Rutland 
Signed-off-by: Will Deacon