[PATCH v5 0/7] fs/resctrl: Fix some resctl bugs related to mpam

[Jinjie Ruan]

From: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>

Fix resctrl RMID allocation to report a retryable -EBUSY only when
the target CLOSID actually has RMIDs in limbo.

Split the domain-offline path out so it releases busy RMIDs without
allocating a monitor context it never uses.

Also unmount resctrl with the CDP state it was mounted with to fix
another bug with mpam cdp.

And do not allow monitor group move when the RMID index changes.

These fixes are split out of the v10 Narrow-PARTID series below.
        https://lore.kernel.org/all/20261020134239.3921377-1-ruanjinjie@xxxxxxxxxx/

Changes in v5:
- Update and split the patch as Reinette and Ben suggested.
- Adjust the commit message.
- Add Reviewed-by.
- Link to v4:
  - https://lore.kernel.org/all/20261105070934.2258613-1-ruanjinjie@xxxxxxxxxx/
  - https://lore.kernel.org/all/20261105123524.2282090-1-ruanjinjie@xxxxxxxxxx/

Changes in v4:
- Fix the unmount resctrl bug as Reinette suggested.
- Adjust the commit message.
- Add Reviewed-bys.
- Link to v3:
  - https://lore.kernel.org/all/20261031063634.1678345-1-ruanjinjie@xxxxxxxxxx/
  - https://lore.kernel.org/all/20261031094616.1691026-1-ruanjinjie@xxxxxxxxxx/

Changes in v3:
- Add Reviewed-by.
- Local varibles uses reverse Christmas tree style.
- Update the commit message as Reinette suggested.
- Link to v2: https://lore.kernel.org/all/20261030092144.1233551-1-ruanjinjie@xxxxxxxxxx/

Changes in v2
- Update the commit message as Reinette suggested.
- Link to v1: https://lore.kernel.org/all/20261029081513.924019-1-ruanjinjie@xxxxxxxxxx/

Jinjie Ruan (6):
  fs/resctrl: Report a temporary RMID shortage per CLOSID
  fs/resctrl: Do not allocate a monitor context when releasing limbo
    RMIDs
  fs/resctrl: Clear the CDP state after the cleanup
  fs/resctrl: Stop the limbo handler while resctrl is unmounted
  fs/resctrl: Release the limbo RMIDs when the CDP state changes
  fs/resctrl: Add info/moveable_mon_group

Peter Newman (1):
  fs/resctrl: Disallow monitor group move when the RMID index changes

 Documentation/filesystems/resctrl.rst |  15 ++-
 arch/x86/include/asm/resctrl.h        |   6 +
 drivers/resctrl/mpam_resctrl.c        |   9 ++
 fs/resctrl/internal.h                 |   3 +-
 fs/resctrl/monitor.c                  | 151 ++++++++++++++++++++------
 fs/resctrl/rdtgroup.c                 |  50 ++++++++-
 include/linux/arm_mpam.h              |   1 +
 7 files changed, 196 insertions(+), 39 deletions(-)

-- 
2.43.0