A little bit of preparatory work to get ready for MPAM counter
assignment. Resctrl gained support last year for counter assignment for AMD
machines supporting ABMC. Tighten a few things up, that weren't needed for
AMD, so that the MPAM driver can emulate ABMC and hence support counter
assignment.

Based on v7.0-rc3. The last patch is only there to resolve the conflict
in the case that the mpam resctrl glue series [1] is merged first.

Changes since v1:
  https://lore.kernel.org/lkml/20260225201905.3568624-1-ben.horgan@arm.com/

Update the commit message for adding resctrl_arch_is_evt_configurable()
and change the new argument name to per_cntr
Make the event_filter file read only rather than hiding it
Include resctrl arch hook for fixed counter assignment mode.
This replaces:
  https://lore.kernel.org/lkml/20260204161952.685921-1-ben.horgan@arm.com/
Include both new helpers in the mpam build fix

[1] https://lore.kernel.org/linux-arm-kernel/20260313144617.3420416-1-ben.horgan@arm.com/

Ben Horgan (6):
  x86,fs/resctrl: Make resctrl_arch_is_evt_configurable() aware of
    mbm_assign_mode
  fs/resctrl: Tidy up the error path in resctrl_mkdir_event_configs()
  fs/resctrl: Make 'event_filter' files read only if they're not
    configurable
  fs/resctrl: Disallow the software controller when mbm counters are
    assignable
  x86,fs/resctrl: Add resctrl_arch_mbm_cntr_assign_fixed()
  arm_mpam: resctrl: Adapt to new or changed resctrl arch functions

 arch/x86/kernel/cpu/resctrl/core.c    | 12 +++++++++--
 arch/x86/kernel/cpu/resctrl/monitor.c |  5 +++++
 drivers/resctrl/mpam_resctrl.c        |  7 ++++++-
 fs/resctrl/monitor.c                  | 18 +++++++++++++---
 fs/resctrl/rdtgroup.c                 | 30 ++++++++++++++++++++-------
 include/linux/resctrl.h               | 12 ++++++++++-
 6 files changed, 70 insertions(+), 14 deletions(-)

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2.43.0