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Subject[PATCH v5 0/7] Add support for the ARMv8.2 Statistical Profiling Extension
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Hi all,

This is the seventh posting of the patches previously posted here:

rfcv1: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/476450.html
rfcv2: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/479387.html
v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/483684.html
v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-April/499938.html
v3: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-May/507132.html
v4: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-June/510799.html

There have been many changes since v4, mainly thanks to useful review
comments from Mark Rutland:

* Require CAP_SYS_ADMIN for sampling physical addresses, the physical
counter and context information (ASID/VMID)
* Handle AUX buffer allocations when cpu == -1
* Fix PERF_IDX2OFF for non-power-of-2 pages buffer sizes
* Use %016llx when printing PMBSR
* Fix masking of PMSIRR_EL1.INTERVAL
* Don't reject events based on sample period (for consistency with
PERF_EVENT_IOC_PERIOD)
* Consolidate isb() usage
* Add of_device_id table sentinel to avoid overrunning ID table
* Complete rewrite of __arm_spe_pmu_next_off, based on wakeup changes in core
* Rename cnt_width to counter_sz
* Ensure PMBPTR is aligned to record size when profiling is active
* Complete rewrite of exception handling
* Move register definitions into asm/sysreg.h
* Now tested on FPGA (as opposed to just on the FastModel)!

The architecture documentation is available here:

https://developer.arm.com/products/architecture/a-profile/docs/ddi0586/latest/arm-architecture-reference-manual-supplement-statistical-profiling-extension-for-armv8-a

and there's a high-level overview on this official ARM blog:

https://community.arm.com/processors/b/blog/posts/statistical-profiling-extension-for-armv8-a

All comments welcome,

Will

--->8

Will Deacon (7):
genirq: export irq_get_percpu_devid_partition to modules
perf/core: Export AUX buffer helpers to modules
perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples
arm64: sysreg: Move SPE registers and PSB into common header files
arm64: head: Init PMSCR_EL2.{PA,PCT} when entered at EL2 without VHE
drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension
dt-bindings: Document devicetree binding for ARM SPE

Documentation/devicetree/bindings/arm/spe-pmu.txt | 20 +
arch/arm64/include/asm/barrier.h | 2 +
arch/arm64/include/asm/sysreg.h | 93 ++
arch/arm64/kernel/head.S | 17 +-
arch/arm64/kvm/hyp/debug-sr.c | 24 +-
drivers/perf/Kconfig | 8 +
drivers/perf/Makefile | 1 +
drivers/perf/arm_spe_pmu.c | 1246 +++++++++++++++++++++
include/uapi/linux/perf_event.h | 1 +
kernel/events/ring_buffer.c | 4 +
kernel/irq/irqdesc.c | 1 +
11 files changed, 1395 insertions(+), 22 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/spe-pmu.txt
create mode 100644 drivers/perf/arm_spe_pmu.c

--
2.1.4

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