Re: [RFC V1 25/31] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

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On 1/24/22 06:57, Anshuman Khandual wrote:
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.

Cc: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
  arch/nios2/Kconfig               |  1 +
  arch/nios2/include/asm/pgtable.h | 16 -------------
  arch/nios2/mm/init.c             | 41 ++++++++++++++++++++++++++++++++
  3 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 33fd06f5fa41..85a58a357a3b 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -6,6 +6,7 @@ config NIOS2
  	select ARCH_HAS_SYNC_DMA_FOR_CPU
  	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
  	select ARCH_HAS_DMA_SET_UNCACHED
+	select ARCH_HAS_VM_GET_PAGE_PROT
  	select ARCH_NO_SWAP
  	select COMMON_CLK
  	select TIMER_OF
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
index 4a995fa628ee..2678dad58a63 100644
--- a/arch/nios2/include/asm/pgtable.h
+++ b/arch/nios2/include/asm/pgtable.h
@@ -40,24 +40,8 @@ struct mm_struct;
   */
/* Remove W bit on private pages for COW support */
-#define __P000	MKP(0, 0, 0)
-#define __P001	MKP(0, 0, 1)
-#define __P010	MKP(0, 0, 0)	/* COW */
-#define __P011	MKP(0, 0, 1)	/* COW */
-#define __P100	MKP(1, 0, 0)
-#define __P101	MKP(1, 0, 1)
-#define __P110	MKP(1, 0, 0)	/* COW */
-#define __P111	MKP(1, 0, 1)	/* COW */
/* Shared pages can have exact HW mapping */
-#define __S000	MKP(0, 0, 0)
-#define __S001	MKP(0, 0, 1)
-#define __S010	MKP(0, 1, 0)
-#define __S011	MKP(0, 1, 1)
-#define __S100	MKP(1, 0, 0)
-#define __S101	MKP(1, 0, 1)
-#define __S110	MKP(1, 1, 0)
-#define __S111	MKP(1, 1, 1)
/* Used all over the kernel */
  #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c
index 613fcaa5988a..4f8251e62f31 100644
--- a/arch/nios2/mm/init.c
+++ b/arch/nios2/mm/init.c
@@ -124,3 +124,44 @@ const char *arch_vma_name(struct vm_area_struct *vma)
  {
  	return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
  }
+
+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 MKP(0, 0, 0);
+	case VM_READ:
+		return MKP(0, 0, 1);
+	case VM_WRITE:
+		return MKP(0, 0, 0);
+	case VM_READ | VM_WRITE:
+		return MKP(0, 0, 1);
+	case VM_EXEC:
+		return MKP(1, 0, 0);
+	case VM_EXEC | VM_READ:
+		return MKP(1, 0, 1);
+	case VM_EXEC | VM_WRITE:
+		return MKP(1, 0, 0);
+	case VM_EXEC | VM_READ | VM_WRITE:
+		return MKP(1, 0, 1);
+	case VM_SHARED:
+		return MKP(0, 0, 0);
+	case VM_SHARED | VM_READ:
+		return MKP(0, 0, 1);
+	case VM_SHARED | VM_WRITE:
+		return MKP(0, 1, 0);
+	case VM_SHARED | VM_READ | VM_WRITE:
+		return MKP(0, 1, 1);
+	case VM_SHARED | VM_EXEC:
+		return MKP(1, 0, 0);
+	case VM_SHARED | VM_EXEC | VM_READ:
+		return MKP(1, 0, 1);
+	case VM_SHARED | VM_EXEC | VM_WRITE:
+		return MKP(1, 1, 0);
+	case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+		return MKP(1, 1, 1);
+	default:
+		BUILD_BUG();
+	}
+}
+EXPORT_SYMBOL(vm_get_page_prot);


Acked-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>




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