The patch titled
Subject: loongarch/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
has been added to the -mm mm-unstable branch. Its filename is
loongarch-mm-enable-arch_has_vm_get_page_prot.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/loongarch-mm-enable-arch_has_vm_get_page_prot.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: loongarch/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
Date: Thu, 30 Jun 2022 10:46:13 +0530
This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports
standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT,
which looks up a private and static protection_map[] array. Subsequently
all __SXXX and __PXXX macros can be dropped which are no longer needed.
Link: https://lkml.kernel.org/r/20220630051630.1718927-10-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/loongarch/Kconfig | 1
arch/loongarch/include/asm/pgtable-bits.h | 19 --------
arch/loongarch/mm/cache.c | 46 ++++++++++++++++++++
3 files changed, 47 insertions(+), 19 deletions(-)
--- a/arch/loongarch/include/asm/pgtable-bits.h~loongarch-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/loongarch/include/asm/pgtable-bits.h
@@ -83,25 +83,6 @@
_PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC)
#define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC)
-
-#define __P000 __pgprot(_CACHE_CC | _PAGE_USER | _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ)
-#define __P001 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
-#define __P010 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
-#define __P011 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
-#define __P100 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-#define __P101 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-#define __P110 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-#define __P111 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-
-#define __S000 __pgprot(_CACHE_CC | _PAGE_USER | _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ)
-#define __S001 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
-#define __S010 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE)
-#define __S011 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE)
-#define __S100 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-#define __S101 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
-#define __S110 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE)
-#define __S111 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE)
-
#ifndef __ASSEMBLY__
#define pgprot_noncached pgprot_noncached
--- a/arch/loongarch/Kconfig~loongarch-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/loongarch/Kconfig
@@ -9,6 +9,7 @@ config LOONGARCH
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PTE_SPECIAL
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_INLINE_READ_LOCK if !PREEMPTION
select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
--- a/arch/loongarch/mm/cache.c~loongarch-mm-enable-arch_has_vm_get_page_prot
+++ a/arch/loongarch/mm/cache.c
@@ -139,3 +139,49 @@ void cpu_cache_init(void)
shm_align_mask = PAGE_SIZE - 1;
}
+
+static const pgprot_t protection_map[16] = {
+ [VM_NONE] = __pgprot(_CACHE_CC | _PAGE_USER |
+ _PAGE_PROTNONE | _PAGE_NO_EXEC |
+ _PAGE_NO_READ),
+ [VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC),
+ [VM_WRITE] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC),
+ [VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC),
+ [VM_EXEC] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_EXEC | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_EXEC | VM_WRITE] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_SHARED] = __pgprot(_CACHE_CC | _PAGE_USER |
+ _PAGE_PROTNONE | _PAGE_NO_EXEC |
+ _PAGE_NO_READ),
+ [VM_SHARED | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC),
+ [VM_SHARED | VM_WRITE] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC | _PAGE_WRITE),
+ [VM_SHARED | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_NO_EXEC | _PAGE_WRITE),
+ [VM_SHARED | VM_EXEC] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_SHARED | VM_EXEC | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT),
+ [VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_WRITE),
+ [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
+ _PAGE_USER | _PAGE_PRESENT |
+ _PAGE_WRITE)
+};
+DECLARE_VM_GET_PAGE_PROT
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-mmap-build-protect-protection_map-with-__p000.patch
mm-mmap-define-declare_vm_get_page_prot.patch
powerpc-mm-move-protection_map-inside-the-platform.patch
sparc-mm-move-protection_map-inside-the-platform.patch
arm64-mm-move-protection_map-inside-the-platform.patch
x86-mm-move-protection_map-inside-the-platform.patch
mm-mmap-build-protect-protection_map-with-arch_has_vm_get_page_prot.patch
microblaze-mm-enable-arch_has_vm_get_page_prot.patch
loongarch-mm-enable-arch_has_vm_get_page_prot.patch
openrisc-mm-enable-arch_has_vm_get_page_prot.patch
xtensa-mm-enable-arch_has_vm_get_page_prot.patch
hexagon-mm-enable-arch_has_vm_get_page_prot.patch
parisc-mm-enable-arch_has_vm_get_page_prot.patch
alpha-mm-enable-arch_has_vm_get_page_prot.patch
nios2-mm-enable-arch_has_vm_get_page_prot.patch
riscv-mm-enable-arch_has_vm_get_page_prot.patch
csky-mm-enable-arch_has_vm_get_page_prot.patch
s390-mm-enable-arch_has_vm_get_page_prot.patch
ia64-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
arc-mm-enable-arch_has_vm_get_page_prot.patch
arm-mm-enable-arch_has_vm_get_page_prot.patch
um-mm-enable-arch_has_vm_get_page_prot.patch
sh-mm-enable-arch_has_vm_get_page_prot.patch
mm-mmap-drop-arch_has_vm_get_page_prot.patch
