loongarch/mm: enable ARCH_HAS_VM_GET_PAGE_PROT

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/[email protected]
Signed-off-by: Anshuman Khandual <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: WANG Xuerui <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Brian Cain <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Jonas Bonn <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Russell King <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Stafford Horne <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Vineet Gupta <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

3 files changed, 47 insertions, 19 deletions

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index db2838cf8c02..adf8cf6ec5d5 100644
--- a/arch/loongarch/Kconfig
+++ b/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
diff --git a/arch/loongarch/include/asm/pgtable-bits.h b/arch/loongarch/include/asm/pgtable-bits.h
index 3badd112d9ab..9ca147a29bab 100644
--- a/arch/loongarch/include/asm/pgtable-bits.h
+++ b/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
diff --git a/arch/loongarch/mm/cache.c b/arch/loongarch/mm/cache.c
index 9e5ce5aa73f7..e8c68dcf6ab2 100644
--- a/arch/loongarch/mm/cache.c
+++ b/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