[PATCH v2 00/19] ARC mm updates: support 3/4 levels and asm-generic/pgalloc

[Vineet Gupta]

Hi,

Big pile of ARC mm changes to prepare for 3 or 4 levels of paging (from
current 2) needed for new hardware page walked MMUv6 (in aRCv3 ISA based
cores).

Most of these changes are incremental cleanups to make way for 14/18 and
15/18 which actually imeplement the new levels (in existing ARCv2 port)
and worth a critical eye.

CC'ing some of you guys dealing with page tables for a while :-)
to spot any obvious gotchas.

Thx,
-Vineet

Changes since v1 [1]
 - Switched ARC to asm-generic/pgalloc.h  (so struct page based pgtable_t)      [Mike Rapoport]
 - Dropped {pud,pmd}_alloc_one/{pud,pmd}_free provided by asm-generic/pgalloc.h [Mike Rapoport]
 - Negative diffstat now due to above
 - Added BUILD_BUG_ON() to arch/arc/mm/init.c for sanity of table sizes
 - Consolidated 2 patches related to ARC_USE_SCRATCH_REG			   [Mike Rapoport]
 - Reworked how mmu is re-enabled in entry code                                 [Jose Abreu]

[1] http://lists.infradead.org/pipermail/linux-snps-arc/2021-August/005326.html

Vineet Gupta (19):
  ARC: mm: use SCRATCH_DATA0 register for caching pgdir in ARCv2 only
  ARC: mm: remove tlb paranoid code
  ARC: mm: move mmu/cache externs out to setup.h
  ARC: mm: Fixes to allow STRICT_MM_TYPECHECKS
  ARC: mm: Enable STRICT_MM_TYPECHECKS
  ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag
  ARC: mm: pmd_populate* to use the canonical set_pmd (and drop pmd_set)
  ARC: mm: switch pgtable_t back to struct page *
  ARC: mm: switch to asm-generic/pgalloc.h
  ARC: mm: non-functional code cleanup ahead of 3 levels
  ARC: mm: move MMU specific bits out of ASID allocator
  ARC: mm: move MMU specific bits out of entry code ...
  ARC: mm: disintegrate mmu.h (arcv2 bits out)
  ARC: mm: disintegrate pgtable.h into levels and flags
  ARC: mm: hack to allow 2 level build with 4 level code
  ARC: mm: support 3 levels of page tables
  ARC: mm: support 4 levels of page tables
  ARC: mm: vmalloc sync from kernel to user table to update PMD ...
  ARC: mm: introduce _PAGE_TABLE to explicitly link pgd,pud,pmd entries

 arch/arc/Kconfig                          |   7 +-
 arch/arc/include/asm/cache.h              |   4 -
 arch/arc/include/asm/entry-compact.h      |   8 -
 arch/arc/include/asm/mmu-arcv2.h          | 103 +++++++
 arch/arc/include/asm/mmu.h                |  73 +----
 arch/arc/include/asm/mmu_context.h        |  28 +-
 arch/arc/include/asm/page.h               |  74 +++--
 arch/arc/include/asm/pgalloc.h            |  81 ++----
 arch/arc/include/asm/pgtable-bits-arcv2.h | 151 +++++++++++
 arch/arc/include/asm/pgtable-levels.h     | 179 ++++++++++++
 arch/arc/include/asm/pgtable.h            | 315 +---------------------
 arch/arc/include/asm/processor.h          |   2 +-
 arch/arc/include/asm/setup.h              |  12 +-
 arch/arc/kernel/entry-arcv2.S             |   1 +
 arch/arc/kernel/entry.S                   |   7 +-
 arch/arc/mm/fault.c                       |  20 +-
 arch/arc/mm/init.c                        |   5 +
 arch/arc/mm/ioremap.c                     |   3 +-
 arch/arc/mm/tlb.c                         |  68 +----
 arch/arc/mm/tlbex.S                       |  78 ++----
 20 files changed, 591 insertions(+), 628 deletions(-)
 create mode 100644 arch/arc/include/asm/mmu-arcv2.h
 create mode 100644 arch/arc/include/asm/pgtable-bits-arcv2.h
 create mode 100644 arch/arc/include/asm/pgtable-levels.h

-- 
2.25.1