perf: Rework event_init checks

Hi all,

[ Note I'm only CC'ing lists for now to avoid spamming nearly 100
individual maintainers/reviewers while we work out the basics ]

Reviving my idea from a few years back, the aim here is to minimise the amount of event_init boilerplate that most new drivers have to implement (and so many get wrong), while also trying to establish some more consistent and easy-to-follow patterns for the things that drivers should still care about (mostly group validation).

It's ended up somewhat big and ugly, so to start with I've tried to optimise for ease of review - based on the typical "fixes, cleanup, new development" order the split of the current patches is like so:

* Group validation rework (patches #1-#15)
- Specific drivers with functional issues by inspection (#1-#7)
- Specific drivers where cleanup changes were non-trivial (#8-#11)
- Common patterns across remaining drivers (#12-#15)
* Capabilities rework (patches #16-#18)
* Giant bonfire of remaining boilerplate! (patch #19)

If the overall idea is acceptable then a more relaxed merge strategy might be to look at landing the common parts first (#16-#18 and maybe #13), then rearrange the rest into per-driver patches, but I'm sure nobody wants a ~70-patch series out of the gate :)

Thanks,
Robin.

Robin Murphy (19):
perf/arm-cmn: Fix event validation perf/hisilicon: Fix group validation perf/imx8_ddr: Fix group validation perf/starfive: Fix group validation iommu/vt-d: Fix perfmon group validation
ARM: l2x0: Fix group validation
ARM: imx: Fix MMDC PMU group validation perf/arm_smmu_v3: Improve group validation perf/qcom: Improve group validation perf/arm-ni: Improve event validation perf/arm-cci: Tidy up event validation
perf: Ignore event state for group validation
perf: Add helper for checking grouped events
perf: Clean up redundant group validation
perf: Simplify group validation
perf: Introduce positive capability for sampling
perf: Retire PERF_PMU_CAP_NO_INTERRUPT
perf: Introduce positive capability for raw events
perf: Garbage-collect event_init checks

 arch/alpha/kernel/perf_event.c                |  5 +-
 arch/arc/kernel/perf_event.c                  |  4 +-
 arch/arm/mach-imx/mmdc.c                      | 29 ++----
 arch/arm/mm/cache-l2x0-pmu.c                  | 19 +---
 arch/csky/kernel/perf_event.c                 |  3 +-
 arch/loongarch/kernel/perf_event.c            |  1 +
 arch/mips/kernel/perf_event_mipsxx.c          |  1 +
 arch/powerpc/perf/8xx-pmu.c                   |  3 +-
 arch/powerpc/perf/core-book3s.c               |  4 +-
 arch/powerpc/perf/core-fsl-emb.c              |  4 +-
 arch/powerpc/perf/hv-24x7.c                   | 11 ---
 arch/powerpc/perf/hv-gpci.c                   | 11 ---
 arch/powerpc/perf/imc-pmu.c                   | 31 +-----
 arch/powerpc/perf/kvm-hv-pmu.c                |  5 +-
 arch/powerpc/perf/vpa-pmu.c                   | 13 +--
 arch/powerpc/platforms/pseries/papr_scm.c     | 18 +---
 arch/s390/kernel/perf_cpum_cf.c               |  8 +-
 arch/s390/kernel/perf_cpum_sf.c               |  2 +
 arch/s390/kernel/perf_pai_crypto.c            |  1 +
 arch/s390/kernel/perf_pai_ext.c               |  1 +
 arch/sh/kernel/perf_event.c                   |  1 -
 arch/sparc/kernel/perf_event.c                |  4 +-
 arch/x86/events/amd/ibs.c                     | 32 ++-----
 arch/x86/events/amd/iommu.c                   | 15 ---
 arch/x86/events/amd/power.c                   |  7 --
 arch/x86/events/amd/uncore.c                  | 12 +--
 arch/x86/events/core.c                        |  7 +-
 arch/x86/events/intel/bts.c                   |  3 -
 arch/x86/events/intel/cstate.c                | 16 +---
 arch/x86/events/intel/pt.c                    |  3 -
 arch/x86/events/intel/uncore.c                | 16 +---
 arch/x86/events/intel/uncore_snb.c            | 18 ----
 arch/x86/events/msr.c                         |  8 +-
 arch/x86/events/rapl.c                        | 11 ---
 arch/xtensa/kernel/perf_event.c               |  1 +
 drivers/devfreq/event/rockchip-dfi.c          | 13 +--
 drivers/dma/idxd/perfmon.c                    | 17 +---
 drivers/fpga/dfl-fme-perf.c                   | 18 +---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c       |  4 -
 drivers/gpu/drm/i915/i915_pmu.c               | 13 ---
 drivers/gpu/drm/xe/xe_pmu.c                   | 13 ---
 .../hwtracing/coresight/coresight-etm-perf.c  |  5 -
 drivers/hwtracing/ptt/hisi_ptt.c              |  8 --
 drivers/iommu/intel/perfmon.c                 | 28 +++---
 drivers/perf/alibaba_uncore_drw_pmu.c         | 28 +-----
 drivers/perf/amlogic/meson_ddr_pmu_core.c     |  9 --
 drivers/perf/arm-cci.c                        | 56 +++--------
 drivers/perf/arm-ccn.c                        | 34 -------
 drivers/perf/arm-cmn.c                        | 15 +--
 drivers/perf/arm-ni.c                         | 35 +++----
 drivers/perf/arm_cspmu/arm_cspmu.c            | 34 +------
 drivers/perf/arm_dmc620_pmu.c                 | 28 +-----
 drivers/perf/arm_dsu_pmu.c                    | 26 +----
 drivers/perf/arm_pmu.c                        | 19 +---
 drivers/perf/arm_pmu_platform.c               |  2 +-
 drivers/perf/arm_smmuv3_pmu.c                 | 35 ++-----
 drivers/perf/arm_spe_pmu.c                    |  7 +-
 drivers/perf/cxl_pmu.c                        |  6 --
 drivers/perf/dwc_pcie_pmu.c                   | 21 +---
 drivers/perf/fsl_imx8_ddr_perf.c              | 32 +------
 drivers/perf/fsl_imx9_ddr_perf.c              | 27 ------
 drivers/perf/hisilicon/hisi_pcie_pmu.c        | 25 ++---
 drivers/perf/hisilicon/hisi_uncore_pmu.c      | 41 ++------
 drivers/perf/hisilicon/hns3_pmu.c             | 24 ++---
 drivers/perf/marvell_cn10k_ddr_pmu.c          | 18 ----
 drivers/perf/marvell_cn10k_tad_pmu.c          | 12 +--
 drivers/perf/marvell_pem_pmu.c                | 22 +----
 drivers/perf/qcom_l2_pmu.c                    | 96 ++++++-------------
 drivers/perf/qcom_l3_pmu.c                    | 33 ++-----
 drivers/perf/riscv_pmu_legacy.c               |  1 -
 drivers/perf/riscv_pmu_sbi.c                  |  3 +-
 drivers/perf/starfive_starlink_pmu.c          | 32 ++-----
 drivers/perf/thunderx2_pmu.c                  | 45 ++-------
 drivers/perf/xgene_pmu.c                      | 29 ------
 drivers/powercap/intel_rapl_common.c          |  9 +-
 include/linux/perf_event.h                    | 10 +-
 kernel/events/core.c                          | 35 +++++--
 kernel/events/hw_breakpoint.c                 |  1 +
 78 files changed, 244 insertions(+), 1053 deletions(-)

2.39.2.101.g768bb238c484.dirty