[PATCH v8 0/4] perf: Add APM X-Gene SoC Performance Monitoring Unit driver

From: Tai Nguyen
Date: Mon Jul 11 2016 - 15:08:42 EST

In addition to the X-Gene ARM CPU performance monitoring unit (PMU), there
are PMU for the SoC system devices such as L3 cache(s), I/O bridge(s),
memory controller bridges and memory. These PMU devices are loosely
architected to follow the same model as the PMU for ARM cores.

Signed-off-by: Tai Nguyen <ttnguyen@xxxxxxx>

* MAINTAINERS: Fix section header in one line
* Change module_platform_driver to builtin_platform_driver
Get rid of the use of module.h and its no-ops macros

* Remove const from the definition of xgene_pmu_cpumask_attrs
* Validate the event group as a whole, disallow creating groups containing
mixed PMUs
* Implement pmu::pmu_enable() and pmu::pmu_disable() to let the perf core
starts and stops the counters properly
* Using list_for_each_entry() instead of list_for_each_entry_safe() to iterate
over the list of pmu sub-devices
* Fix resource leak issue in case of registering perf devices fails
* Pass on returned error if acpi_walk_namespace() fails
* Remove unused xgene_pmu_data::data
* Move enable interrupt after probing pmu sub-devices

* Add IRQF_NOBALANCING and IRQF_NO_THREAD flags to the PMU overflow interrupt
Exclude the interrupt from irq balancing and prevent the context from being

* Remove hw_perf_event::extra_reg field use
Change GET_CNTR to use hw_perf_event::idx
Change GET_AGENTID/GET_AGEN1ID to use hw_perf_event::config_base
* Use compound literal structure defines for format and event attribute groups
to statically define them at compile time
* Bitwise invert the meaning of agent mask in config1 field.
* Fix update pmu_counter_event pointer before starting event
* Add reset of pmu_dev->pmu_counter_event to NULL in xgene_perf_del
* Use exactly half of max period to fix the overflow counter issue and account
for the possiblity of extreme interrupt latency
* Use spin lock instead of interrupt masking in overflow interrupt handler
* Remove unnecessary update of hw_perf_event::period_left

* Alphabetically sorting header files
* Remove dynamic allocation for PMU format and event attribute groups
Create shared constant attribute groups per each class
* Remove perf_sample_data as this perf driver doesn't support sampling
* Consistently use the PCP_PMU_V{1,2} defines
* Set affinity to make sure the overflow interrupt is handled by the
same assigned CPU

* Remove index property use in PMU device sub nodes

* Use bitmask for event asignned counter mask pmu_dev->cntr_assign_mask
* Remove unnecessary spinlocks in perf add/del operations
* Remove unnecessary condition checks
* Enforce CPU assignment to one CPU for perf operarations
* Set the task_ctx_nr to perf_invalid_context for perf driver
* Remove irrelevant pt_rregs
* Change perf sysfs attributes to be fixed instead of dynamic
* Fix checking for an ACPI companion device instead of EFI enable
* Add documentation for config/config1 fields format and perf tool example


Tai Nguyen (4):
MAINTAINERS: Add entry for APM X-Gene SoC PMU driver
Documentation: Add documentation for APM X-Gene SoC PMU DTS binding
perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver
arm64: dts: apm: Add APM X-Gene SoC PMU DTS entries

.../devicetree/bindings/perf/apm-xgene-pmu.txt | 112 ++
Documentation/perf/xgene-pmu.txt | 48 +
arch/arm64/boot/dts/apm/apm-storm.dtsi | 58 +
drivers/perf/Kconfig | 7 +
drivers/perf/Makefile | 1 +
drivers/perf/xgene_pmu.c | 1392 ++++++++++++++++++++
7 files changed, 1625 insertions(+)
create mode 100644 Documentation/devicetree/bindings/perf/apm-xgene-pmu.txt
create mode 100644 Documentation/perf/xgene-pmu.txt
create mode 100644 drivers/perf/xgene_pmu.c