linux-kernel - [PATCH 00/18] ARC mm updates to support 3 or 4 levels of paging

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Date:   Tue, 10 Aug 2021 17:42:40 -0700
From:   Vineet Gupta <vgupta@...nel.org>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mike Rapoport <rppt@...nel.org>,
        Vineet Gupta <vgupta@...nel.org>
Subject: [PATCH 00/18] ARC mm updates to support 3 or 4 levels of paging

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

Vineet Gupta (18):
  ARC: mm: simplify mmu scratch register assingment to mmu needs
  ARC: mm: remove tlb paranoid code
  ARC: mm: move mmu/cache externs out to setup.h
  ARC: mm: remove pgd_offset_fast
  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: 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          |  94 +++++++
 arch/arc/include/asm/mmu.h                |  73 +----
 arch/arc/include/asm/mmu_context.h        |  29 +-
 arch/arc/include/asm/page.h               |  72 +++--
 arch/arc/include/asm/pgalloc.h            |  70 ++++-
 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.S                   |   6 -
 arch/arc/mm/fault.c                       |  20 +-
 arch/arc/mm/ioremap.c                     |   3 +-
 arch/arc/mm/tlb.c                         |  71 ++---
 arch/arc/mm/tlbex.S                       |  80 ++----
 18 files changed, 617 insertions(+), 579 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