On 1/5/23 08:40, Anshuman Khandual wrote:

This series enables perf branch stack sampling support on arm64 platform
via a new arch feature called Branch Record Buffer Extension (BRBE). All
relevant register definitions could be accessed here.

https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers

This series applies on v6.2-r2.

Changes in V7:

- Folded [PATCH 7/7] into [PATCH 3/7] which enables branch stack sampling event
- Defined BRBFCR_EL1_BRANCH_FILTERS, BRBCR_EL1_DEFAULT_CONFIG in the header
- Defined BRBFCR_EL1_DEFAULT_CONFIG in the header
- Updated BRBCR_EL1_DEFAULT_CONFIG with BRBCR_EL1_FZP
- Defined BRBCR_EL1_DEFAULT_TS in the header
- Updated BRBCR_EL1_DEFAULT_CONFIG with BRBCR_EL1_DEFAULT_TS
- Moved BRBCR_EL1_DEFAULT_CONFIG check inside branch_type_to_brbcr()
- Moved down BRBCR_EL1_CC, BRBCR_EL1_MPRED later in branch_type_to_brbcr()
- Also set BRBE in paused state in armv8pmu_branch_disable()
- Dropped brbe_paused(), set_brbe_paused() helpers
- Extracted error string via branch_filter_error_msg[] for armv8pmu_branch_valid()
- Replaced brbe_v1p1 with brbe_version in struct brbe_hw_attr
- Added valid_brbe_[cc, format, version]() helpers
- Split a separate brbe_attributes_probe() from armv8pmu_branch_probe()
- Capture event->attr.branch_sample_type earlier in armv8pmu_branch_valid()
- Defined enum brbe_bank_idx with possible values for BRBE bank indices
- Changed armpmu->hw_attr into armpmu->private
- Added missing space in stub definition for armv8pmu_branch_valid()
- Replaced both kmalloc() with kzalloc()
- Added BRBE_BANK_MAX_ENTRIES
- Updated comment for capture_brbe_flags()
- Updated comment for struct brbe_hw_attr
- Dropped space after type cast in couple of places
- Replaced inverse with negation for testing BRBCR_EL1_FZP in armv8pmu_branch_read()
- Captured cpuc->branches->branch_entries[idx] in a local variable
- Dropped saved_priv from armv8pmu_branch_read()
- Reorganize PERF_SAMPLE_BRANCH_NO_[CYCLES|NO_FLAGS] related configuration
- Replaced with FIELD_GET() and FIELD_PREP() wherever applicable
- Replaced BRBCR_EL1_TS_PHYSICAL with BRBCR_EL1_TS_VIRTUAL
- Moved valid_brbe_nr(), valid_brbe_cc(), valid_brbe_format(), valid_brbe_version()
  select_brbe_bank(), select_brbe_bank_index() helpers inside the C implementation
- Reorganized brbe_valid_nr() and dropped the pr_warn() message
- Changed probe sequence in brbe_attributes_probe()
- Added 'brbcr' argument into capture_brbe_flags() to ascertain correct state
- Disable BRBE before disabling the PMU event counter
- Enable PERF_SAMPLE_BRANCH_HV filters when is_kernel_in_hyp_mode()
- Guard armv8pmu_reset() & armv8pmu_sched_task() with arm_pmu_branch_stack_supported()

Gentle ping, any updates on this series ?

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