+ arm64-mm-enable-arch_has_vm_get_page_prot.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: arm64/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree.  Its filename is
     arm64-mm-enable-arch_has_vm_get_page_prot.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/arm64-mm-enable-arch_has_vm_get_page_prot.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/arm64-mm-enable-arch_has_vm_get_page_prot.patch

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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: arm64/mm: enable ARCH_HAS_VM_GET_PAGE_PROT

This defines and exports a platform specific custom vm_get_page_prot() via
subscribing ARCH_HAS_VM_GET_PAGE_PROT.  Subsequently all __SXXX and __PXXX
macros can be dropped which are no longer needed.  This also localizes
both arch_filter_pgprot and arch_vm_get_page_prot() helpers, unsubscribing
from ARCH_HAS_FILTER_PGPROT as well.  Moved both these localized functions
near vm_get_page_prot().

Link: https://lkml.kernel.org/r/1645425519-9034-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/Kconfig                    |    2 
 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 ++++++++++++++++++++++++
 5 files changed, 79 insertions(+), 54 deletions(-)

--- a/arch/arm64/include/asm/mman.h~arm64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm64/include/asm/mman.h
@@ -35,30 +35,6 @@ static inline unsigned long arch_calc_vm
 }
 #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags)
 
-static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
-{
-	pteval_t prot = 0;
-
-	if (vm_flags & VM_ARM64_BTI)
-		prot |= PTE_GP;
-
-	/*
-	 * There are two conditions required for returning a Normal Tagged
-	 * memory type: (1) the user requested it via PROT_MTE passed to
-	 * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
-	 * register (1) as VM_MTE in the vma->vm_flags and (2) as
-	 * VM_MTE_ALLOWED. Note that the latter can only be set during the
-	 * mmap() call since mprotect() does not accept MAP_* flags.
-	 * Checking for VM_MTE only is sufficient since arch_validate_flags()
-	 * does not permit (VM_MTE & !VM_MTE_ALLOWED).
-	 */
-	if (vm_flags & VM_MTE)
-		prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
-
-	return __pgprot(prot);
-}
-#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
-
 static inline bool arch_validate_prot(unsigned long prot,
 	unsigned long addr __always_unused)
 {
--- a/arch/arm64/include/asm/pgtable.h~arm64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm64/include/asm/pgtable.h
@@ -1017,17 +1017,6 @@ static inline bool arch_wants_old_prefau
 }
 #define arch_wants_old_prefaulted_pte	arch_wants_old_prefaulted_pte
 
-static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
-{
-	if (cpus_have_const_cap(ARM64_HAS_EPAN))
-		return prot;
-
-	if (pgprot_val(prot) != pgprot_val(PAGE_EXECONLY))
-		return prot;
-
-	return PAGE_READONLY_EXEC;
-}
-
 static inline bool pud_sect_supported(void)
 {
 	return PAGE_SIZE == SZ_4K;
--- a/arch/arm64/include/asm/pgtable-prot.h~arm64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm64/include/asm/pgtable-prot.h
@@ -88,24 +88,6 @@ extern bool arm64_use_ng_mappings;
 #define PAGE_READONLY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN)
 #define PAGE_EXECONLY		__pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN)
 
-#define __P000  PAGE_NONE
-#define __P001  PAGE_READONLY
-#define __P010  PAGE_READONLY
-#define __P011  PAGE_READONLY
-#define __P100  PAGE_EXECONLY
-#define __P101  PAGE_READONLY_EXEC
-#define __P110  PAGE_READONLY_EXEC
-#define __P111  PAGE_READONLY_EXEC
-
-#define __S000  PAGE_NONE
-#define __S001  PAGE_READONLY
-#define __S010  PAGE_SHARED
-#define __S011  PAGE_SHARED
-#define __S100  PAGE_EXECONLY
-#define __S101  PAGE_READONLY_EXEC
-#define __S110  PAGE_SHARED_EXEC
-#define __S111  PAGE_SHARED_EXEC
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_PROT_H */
--- a/arch/arm64/Kconfig~arm64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm64/Kconfig
@@ -23,7 +23,6 @@ config ARM64
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
 	select ARCH_HAS_FAST_MULTIPLIER
-	select ARCH_HAS_FILTER_PGPROT
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE
@@ -44,6 +43,7 @@ config ARM64
 	select ARCH_HAS_SYSCALL_WRAPPER
 	select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_HAS_ZONE_DMA_SET if EXPERT
 	select ARCH_HAVE_ELF_PROT
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
--- a/arch/arm64/mm/mmap.c~arm64-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm64/mm/mmap.c
@@ -10,6 +10,7 @@
 #include <linux/types.h>
 
 #include <asm/page.h>
+#include <asm/mman.h>
 
 /*
  * You really shouldn't be using read() or write() on /dev/mem.  This might go
@@ -38,3 +39,80 @@ int valid_mmap_phys_addr_range(unsigned
 {
 	return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK);
 }
+
+static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags)
+{
+	switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) {
+	case VM_NONE:
+		return PAGE_NONE;
+	case VM_READ:
+	case VM_WRITE:
+	case VM_WRITE | VM_READ:
+		return PAGE_READONLY;
+	case VM_EXEC:
+		return PAGE_EXECONLY;
+	case VM_EXEC | VM_READ:
+	case VM_EXEC | VM_WRITE:
+	case VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_READONLY_EXEC;
+	case VM_SHARED:
+		return PAGE_NONE;
+	case VM_SHARED | VM_READ:
+		return PAGE_READONLY;
+	case VM_SHARED | VM_WRITE:
+	case VM_SHARED | VM_WRITE | VM_READ:
+		return PAGE_SHARED;
+	case VM_SHARED | VM_EXEC:
+		return PAGE_EXECONLY;
+	case VM_SHARED | VM_EXEC | VM_READ:
+		return PAGE_READONLY_EXEC;
+	case VM_SHARED | VM_EXEC | VM_WRITE:
+	case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_SHARED_EXEC;
+	default:
+		BUILD_BUG();
+	}
+}
+
+static pgprot_t arm64_arch_filter_pgprot(pgprot_t prot)
+{
+	if (cpus_have_const_cap(ARM64_HAS_EPAN))
+		return prot;
+
+	if (pgprot_val(prot) != pgprot_val(PAGE_EXECONLY))
+		return prot;
+
+	return PAGE_READONLY_EXEC;
+}
+
+static pgprot_t arm64_arch_vm_get_page_prot(unsigned long vm_flags)
+{
+	pteval_t prot = 0;
+
+	if (vm_flags & VM_ARM64_BTI)
+		prot |= PTE_GP;
+
+	/*
+	 * There are two conditions required for returning a Normal Tagged
+	 * memory type: (1) the user requested it via PROT_MTE passed to
+	 * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
+	 * register (1) as VM_MTE in the vma->vm_flags and (2) as
+	 * VM_MTE_ALLOWED. Note that the latter can only be set during the
+	 * mmap() call since mprotect() does not accept MAP_* flags.
+	 * Checking for VM_MTE only is sufficient since arch_validate_flags()
+	 * does not permit (VM_MTE & !VM_MTE_ALLOWED).
+	 */
+	if (vm_flags & VM_MTE)
+		prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
+
+	return __pgprot(prot);
+}
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+	pgprot_t ret = __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) |
+			pgprot_val(arm64_arch_vm_get_page_prot(vm_flags)));
+
+	return arm64_arch_filter_pgprot(ret);
+}
+EXPORT_SYMBOL(vm_get_page_prot);
_

Patches currently in -mm which might be from anshuman.khandual@arm.com are

mm-generalize-arch_has_filter_pgprot.patch
mm-merge-pte_mkhuge-call-into-arch_make_huge_pte.patch
mm-debug_vm_pgtable-drop-protection_map-usage.patch
mm-mmap-clarify-protection_map-indices.patch
mm-mmap-add-new-config-arch_has_vm_get_page_prot.patch
powerpc-mm-enable-arch_has_vm_get_page_prot.patch
arm64-mm-enable-arch_has_vm_get_page_prot.patch
sparc-mm-enable-arch_has_vm_get_page_prot.patch
mips-mm-enable-arch_has_vm_get_page_prot.patch
m68k-mm-enable-arch_has_vm_get_page_prot.patch
arm-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-protection_map.patch
mm-mmap-drop-arch_filter_pgprot.patch
mm-mmap-drop-arch_vm_get_page_pgprot.patch
s390-mm-enable-arch_has_vm_get_page_prot.patch
riscv-mm-enable-arch_has_vm_get_page_prot.patch
alpha-mm-enable-arch_has_vm_get_page_prot.patch
sh-mm-enable-arch_has_vm_get_page_prot.patch
arc-mm-enable-arch_has_vm_get_page_prot.patch
csky-mm-enable-arch_has_vm_get_page_prot.patch
extensa-mm-enable-arch_has_vm_get_page_prot.patch
parisc-mm-enable-arch_has_vm_get_page_prot.patch
openrisc-mm-enable-arch_has_vm_get_page_prot.patch
um-mm-enable-arch_has_vm_get_page_prot.patch
microblaze-mm-enable-arch_has_vm_get_page_prot.patch
nios2-mm-enable-arch_has_vm_get_page_prot.patch
hexagon-mm-enable-arch_has_vm_get_page_prot.patch
nds32-mm-enable-arch_has_vm_get_page_prot.patch
ia64-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-generic-vm_get_page_prot.patch
mm-mmap-drop-arch_has_vm_get_page_prot.patch
mm-hugetlb-generalize-arch_want_general_hugetlb.patch
mm-migration-add-trace-events-for-thp-migrations.patch
mm-migration-add-trace-events-for-base-page-and-hugetlb-migrations.patch