protection_map[] is an array based construct that translates given vm_flags combination. This array contains page protection map, which is populated by the platform via [__S000 .. __S111] and [__P000 .. __P111] exported macros. Primary usage for protection_map[] is for vm_get_page_prot(), which is used to determine page protection value for a given vm_flags. vm_get_page_prot() implementation, could again call platform overrides arch_vm_get_page_prot() and arch_filter_pgprot(). Some platforms override protection_map[] that was originally built with __SXXX/__PXXX with different runtime values.
Currently there are multiple layers of abstraction i.e __SXXX/__PXXX macros , protection_map[], arch_vm_get_page_prot() and arch_filter_pgprot() built between the platform and generic MM, finally defining vm_get_page_prot(). Hence this series proposes to drop all these abstraction levels and instead just move the responsibility of defining vm_get_page_prot() to the platform itself making it clean and simple. This first introduces ARCH_HAS_VM_GET_PAGE_PROT which enables the platforms to define custom vm_get_page_prot(). This starts converting platforms that either change protection_map[] or define the overrides arch_filter_pgprot() or arch_vm_get_page_prot() which enables for those constructs to be dropped off completely. This series then converts remaining platforms which enables for __SXXX/__PXXX constructs to be dropped off completely. Finally it drops the generic vm_get_page_prot() and then ARCH_HAS_VM_GET_PAGE_PROT as every platform now defines their own vm_get_page_prot(). The series has been inspired from an earlier discuss with Christoph Hellwig https://lore.kernel.org/all/1632712920-8171-1-git-send-email-anshuman.khand...@arm.com/ This series applies on 5.17-rc6 after the following patch. https://lore.kernel.org/all/1643004823-16441-1-git-send-email-anshuman.khand...@arm.com/ This series has been cross built for multiple platforms. - Anshuman Cc: Christoph Hellwig <h...@infradead.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-arm-ker...@lists.infradead.org Cc: sparcli...@vger.kernel.org Cc: linux-m...@vger.kernel.org Cc: linux-m...@lists.linux-m68k.org Cc: linux-s...@vger.kernel.org Cc: linux-ri...@lists.infradead.org Cc: linux-al...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linux-snps-...@lists.infradead.org Cc: linux-c...@vger.kernel.org Cc: linux-xte...@linux-xtensa.org Cc: linux-par...@vger.kernel.org Cc: openr...@lists.librecores.org Cc: linux...@lists.infradead.org Cc: linux-hexa...@vger.kernel.org Cc: linux-i...@vger.kernel.org Cc: linux...@kvack.org Cc: linux-a...@vger.kernel.org Cc: linux-ker...@vger.kernel.org Changes in V3: - Dropped variable 'i' from sme_early_init() on x86 platform - Moved CONFIG_COLDFIRE vm_get_page_prot() inside arch/m68k/mm/mcfmmu.c - Moved CONFIG_SUN3 vm_get_page_prot() inside arch/m68k/mm/sun3mmu.c - Dropped cachebits for vm_get_page_prot() inside arch/m68k/mm/motorola.c - Dropped PAGE_XXX_C definitions from arch/m68k/include/asm/motorola_pgtable.h - Used PAGE_XXX instead for vm_get_page_prot() inside arch/m68k/mm/motorola.c - Dropped all references to protection_map[] in the tree - Replaced s/extensa/xtensa/ on the patch title - Moved left over comments from pgtable.h into init.c on nios2 platform Changes in V2: https://lore.kernel.org/all/1645425519-9034-1-git-send-email-anshuman.khand...@arm.com/ - Dropped the entire comment block in [PATCH 30/30] per Geert - Replaced __P010 (although commented) with __PAGE_COPY on arm platform - Replaced __P101 with PAGE_READONLY on um platform Changes in V1: https://lore.kernel.org/all/1644805853-21338-1-git-send-email-anshuman.khand...@arm.com/ - Add white spaces around the | operators - Moved powerpc_vm_get_page_prot() near vm_get_page_prot() on powerpc - Moved arm64_vm_get_page_prot() near vm_get_page_prot() on arm64 - Moved sparc_vm_get_page_prot() near vm_get_page_prot() on sparc - Compacted vm_get_page_prot() switch cases on all platforms - _PAGE_CACHE040 inclusion is dependent on CPU_IS_040_OR_060 - VM_SHARED case should return PAGE_NONE (not PAGE_COPY) on SH platform - Reorganized VM_SHARED, VM_EXEC, VM_WRITE, VM_READ - Dropped the last patch [RFC V1 31/31] which added macros for vm_flags combinations https://lore.kernel.org/all/1643029028-12710-32-git-send-email-anshuman.khand...@arm.com/ Changes in RFC: https://lore.kernel.org/all/1643029028-12710-1-git-send-email-anshuman.khand...@arm.com/ Anshuman Khandual (29): mm/debug_vm_pgtable: Drop protection_map[] usage mm/mmap: Clarify protection_map[] indices mm/mmap: Add new config ARCH_HAS_VM_GET_PAGE_PROT powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT arm64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT sparc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT mips/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT m68k/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT arm/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT mm/mmap: Drop protection_map[] mm/mmap: Drop arch_filter_pgprot() mm/mmap: Drop arch_vm_get_page_pgprot() s390/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT riscv/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT alpha/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT sh/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT arc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT csky/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT xtensa/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT parisc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT openrisc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT um/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT microblaze/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT hexagon/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT nds32/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT ia64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT mm/mmap: Drop generic vm_get_page_prot() mm/mmap: Drop ARCH_HAS_VM_GET_PAGE_PROT Christoph Hellwig (1): x86/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT arch/alpha/include/asm/pgtable.h | 17 ----- arch/alpha/mm/init.c | 37 +++++++++++ arch/arc/include/asm/pgtable-bits-arcv2.h | 17 ----- arch/arc/mm/mmap.c | 41 ++++++++++++ arch/arm/include/asm/pgtable.h | 20 +----- arch/arm/lib/uaccess_with_memcpy.c | 2 +- arch/arm/mm/mmu.c | 44 +++++++++++-- arch/arm64/Kconfig | 1 - arch/arm64/include/asm/memory.h | 3 +- arch/arm64/include/asm/mman.h | 24 ------- arch/arm64/include/asm/pgtable-prot.h | 18 ------ arch/arm64/include/asm/pgtable.h | 11 ---- arch/arm64/mm/mmap.c | 78 +++++++++++++++++++++++ arch/csky/include/asm/pgtable.h | 18 ------ arch/csky/mm/init.c | 32 ++++++++++ arch/hexagon/include/asm/pgtable.h | 24 ------- arch/hexagon/mm/init.c | 67 +++++++++++++++++++ arch/ia64/include/asm/pgtable.h | 17 ----- arch/ia64/mm/init.c | 41 +++++++++++- arch/m68k/include/asm/mcf_pgtable.h | 59 ----------------- arch/m68k/include/asm/motorola_pgtable.h | 29 --------- arch/m68k/include/asm/sun3_pgtable.h | 22 ------- arch/m68k/mm/mcfmmu.c | 59 +++++++++++++++++ arch/m68k/mm/motorola.c | 43 ++++++++++++- arch/m68k/mm/sun3mmu.c | 39 ++++++++++++ arch/microblaze/include/asm/pgtable.h | 17 ----- arch/microblaze/mm/init.c | 41 ++++++++++++ arch/mips/include/asm/pgtable.h | 22 ------- arch/mips/mm/cache.c | 60 +++++++++-------- arch/nds32/include/asm/pgtable.h | 17 ----- arch/nds32/mm/mmap.c | 37 +++++++++++ arch/nios2/include/asm/pgtable.h | 24 ------- arch/nios2/mm/init.c | 47 ++++++++++++++ arch/openrisc/include/asm/pgtable.h | 18 ------ arch/openrisc/mm/init.c | 41 ++++++++++++ arch/parisc/include/asm/pgtable.h | 20 ------ arch/parisc/mm/init.c | 40 ++++++++++++ arch/powerpc/include/asm/mman.h | 12 ---- arch/powerpc/include/asm/pgtable.h | 19 ------ arch/powerpc/mm/mmap.c | 59 +++++++++++++++++ arch/riscv/include/asm/pgtable.h | 16 ----- arch/riscv/mm/init.c | 42 ++++++++++++ arch/s390/include/asm/pgtable.h | 17 ----- arch/s390/mm/mmap.c | 33 ++++++++++ arch/sh/include/asm/pgtable.h | 17 ----- arch/sh/mm/mmap.c | 38 +++++++++++ arch/sparc/include/asm/mman.h | 6 -- arch/sparc/include/asm/pgtable_32.h | 19 ------ arch/sparc/include/asm/pgtable_64.h | 19 ------ arch/sparc/mm/init_32.c | 35 ++++++++++ arch/sparc/mm/init_64.c | 70 ++++++++++++++------ arch/um/include/asm/pgtable.h | 17 ----- arch/um/kernel/mem.c | 35 ++++++++++ arch/x86/Kconfig | 1 - arch/x86/include/asm/pgtable.h | 5 -- arch/x86/include/asm/pgtable_types.h | 19 ------ arch/x86/include/uapi/asm/mman.h | 14 ---- arch/x86/mm/Makefile | 2 +- arch/x86/mm/mem_encrypt_amd.c | 6 -- arch/x86/mm/pgprot.c | 71 +++++++++++++++++++++ arch/x86/um/mem_32.c | 2 +- arch/xtensa/include/asm/pgtable.h | 19 ------ arch/xtensa/mm/init.c | 35 ++++++++++ drivers/gpu/drm/drm_vm.c | 4 +- include/linux/mm.h | 6 -- include/linux/mman.h | 4 -- mm/Kconfig | 3 - mm/debug_vm_pgtable.c | 31 +++++---- mm/mmap.c | 44 +------------ 69 files changed, 1138 insertions(+), 729 deletions(-) create mode 100644 arch/x86/mm/pgprot.c -- 2.25.1
