The patch titled
Subject: arm/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm tree. Its filename is
arm-mm-enable-arch_has_vm_get_page_prot.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/arm-mm-enable-arch_has_vm_get_page_prot.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/arm-mm-enable-arch_has_vm_get_page_prot.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: arm/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.
Link: https://lkml.kernel.org/r/1645425519-9034-10-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/Kconfig | 1
arch/arm/include/asm/pgtable.h | 18 -----------
arch/arm/lib/uaccess_with_memcpy.c | 2 -
arch/arm/mm/mmu.c | 44 +++++++++++++++++++++++----
4 files changed, 40 insertions(+), 25 deletions(-)
--- a/arch/arm/include/asm/pgtable.h~arm-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm/include/asm/pgtable.h
@@ -137,24 +137,6 @@ extern pgprot_t phys_mem_access_prot(str
* 2) If we could do execute protection, then read is implied
* 3) write implies read permissions
*/
-#define __P000 __PAGE_NONE
-#define __P001 __PAGE_READONLY
-#define __P010 __PAGE_COPY
-#define __P011 __PAGE_COPY
-#define __P100 __PAGE_READONLY_EXEC
-#define __P101 __PAGE_READONLY_EXEC
-#define __P110 __PAGE_COPY_EXEC
-#define __P111 __PAGE_COPY_EXEC
-
-#define __S000 __PAGE_NONE
-#define __S001 __PAGE_READONLY
-#define __S010 __PAGE_SHARED
-#define __S011 __PAGE_SHARED
-#define __S100 __PAGE_READONLY_EXEC
-#define __S101 __PAGE_READONLY_EXEC
-#define __S110 __PAGE_SHARED_EXEC
-#define __S111 __PAGE_SHARED_EXEC
-
#ifndef __ASSEMBLY__
/*
* ZERO_PAGE is a global shared page that is always zero: used
--- a/arch/arm/Kconfig~arm-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm/Kconfig
@@ -23,6 +23,7 @@ config ARM
select ARCH_HAS_SYNC_DMA_FOR_CPU if SWIOTLB || !MMU
select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_V7 || CPU_V7M || CPU_V6K
select ARCH_HAS_GCOV_PROFILE_ALL
--- a/arch/arm/lib/uaccess_with_memcpy.c~arm-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm/lib/uaccess_with_memcpy.c
@@ -247,7 +247,7 @@ static int __init test_size_treshold(voi
if (!dst_page)
goto no_dst;
kernel_ptr = page_address(src_page);
- user_ptr = vmap(&dst_page, 1, VM_IOREMAP, __pgprot(__P010));
+ user_ptr = vmap(&dst_page, 1, VM_IOREMAP, __pgprot(__PAGE_COPY));
if (!user_ptr)
goto no_vmap;
--- a/arch/arm/mm/mmu.c~arm-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/arm/mm/mmu.c
@@ -403,6 +403,8 @@ void __set_fixmap(enum fixed_addresses i
local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
}
+static pteval_t user_pgprot;
+
/*
* Adjust the PMD section entries according to the CPU in use.
*/
@@ -410,7 +412,7 @@ static void __init build_mem_type_table(
{
struct cachepolicy *cp;
unsigned int cr = get_cr();
- pteval_t user_pgprot, kern_pgprot, vecs_pgprot;
+ pteval_t kern_pgprot, vecs_pgprot;
int cpu_arch = cpu_architecture();
int i;
@@ -627,11 +629,6 @@ static void __init build_mem_type_table(
user_pgprot |= PTE_EXT_PXN;
#endif
- for (i = 0; i < 16; i++) {
- pteval_t v = pgprot_val(protection_map[i]);
- protection_map[i] = __pgprot(v | user_pgprot);
- }
-
mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot;
mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot;
@@ -670,6 +667,41 @@ static void __init build_mem_type_table(
}
}
+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 __pgprot(pgprot_val(__PAGE_NONE) | user_pgprot);
+ case VM_READ:
+ return __pgprot(pgprot_val(__PAGE_READONLY) | user_pgprot);
+ case VM_WRITE:
+ case VM_WRITE | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_COPY) | user_pgprot);
+ case VM_EXEC:
+ case VM_EXEC | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_READONLY_EXEC) | user_pgprot);
+ case VM_EXEC | VM_WRITE:
+ case VM_EXEC | VM_WRITE | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_COPY_EXEC) | user_pgprot);
+ case VM_SHARED:
+ return __pgprot(pgprot_val(__PAGE_NONE) | user_pgprot);
+ case VM_SHARED | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_READONLY) | user_pgprot);
+ case VM_SHARED | VM_WRITE:
+ case VM_SHARED | VM_WRITE | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_SHARED) | user_pgprot);
+ case VM_SHARED | VM_EXEC:
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_READONLY_EXEC) | user_pgprot);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+ return __pgprot(pgprot_val(__PAGE_SHARED_EXEC) | user_pgprot);
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
+
#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx 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
