[PATCH V3 24/30] microblaze/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, geert@linux-m68k.org,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Christoph Hellwig <hch@infradead.org>,
	linuxppc-dev@lists.ozlabs.org,
	linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
	linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-alpha@vger.kernel.org, linux-sh@vger.kernel.org,
	linux-snps-arc@lists.infradead.org, linux-csky@vger.kernel.org,
	linux-xtensa@linux-xtensa.org, linux-parisc@vger.kernel.org,
	openrisc@lists.librecores.org, linux-um@lists.infradead.org,
	linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
	linux-arch@vger.kernel.org, Michal Simek <monstr@monstr.eu>
Subject: [PATCH V3 24/30] microblaze/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
Date: Mon, 28 Feb 2022 16:17:47 +0530	[thread overview]
Message-ID: <1646045273-9343-25-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1646045273-9343-1-git-send-email-anshuman.khandual@arm.com>

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: Michal Simek <monstr@monstr.eu>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/microblaze/Kconfig               |  1 +
 arch/microblaze/include/asm/pgtable.h | 17 -----------
 arch/microblaze/mm/init.c             | 41 +++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 59798e43cdb0..f2c25ba8621e 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -7,6 +7,7 @@ config MICROBLAZE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_TABLE_SORT
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index c136a01e467e..6df373077ff2 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -204,23 +204,6 @@ extern pte_t *va_to_pte(unsigned long address);
  * We consider execute permission the same as read.
  * Also, write permissions imply read permissions.
  */
-#define __P000	PAGE_NONE
-#define __P001	PAGE_READONLY_X
-#define __P010	PAGE_COPY
-#define __P011	PAGE_COPY_X
-#define __P100	PAGE_READONLY
-#define __P101	PAGE_READONLY_X
-#define __P110	PAGE_COPY
-#define __P111	PAGE_COPY_X
-
-#define __S000	PAGE_NONE
-#define __S001	PAGE_READONLY_X
-#define __S010	PAGE_SHARED
-#define __S011	PAGE_SHARED_X
-#define __S100	PAGE_READONLY
-#define __S101	PAGE_READONLY_X
-#define __S110	PAGE_SHARED
-#define __S111	PAGE_SHARED_X
 
 #ifndef __ASSEMBLY__
 /*
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index 952f35b335b2..68faf7d04faf 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -280,3 +280,44 @@ void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
 
 	return p;
 }
+
+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:
+		return PAGE_READONLY_X;
+	case VM_WRITE:
+		return PAGE_COPY;
+	case VM_WRITE | VM_READ:
+		return PAGE_COPY_X;
+	case VM_EXEC:
+		return PAGE_READONLY;
+	case VM_EXEC | VM_READ:
+		return PAGE_READONLY_X;
+	case VM_EXEC | VM_WRITE:
+		return PAGE_COPY;
+	case VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_COPY_X;
+	case VM_SHARED:
+		return PAGE_NONE;
+	case VM_SHARED | VM_READ:
+		return PAGE_READONLY_X;
+	case VM_SHARED | VM_WRITE:
+		return PAGE_SHARED;
+	case VM_SHARED | VM_WRITE | VM_READ:
+		return PAGE_SHARED_X;
+	case VM_SHARED | VM_EXEC:
+		return PAGE_READONLY;
+	case VM_SHARED | VM_EXEC | VM_READ:
+		return PAGE_READONLY_X;
+	case VM_SHARED | VM_EXEC | VM_WRITE:
+		return PAGE_SHARED;
+	case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ:
+		return PAGE_SHARED_X;
+	default:
+		BUILD_BUG();
+	}
+}
+EXPORT_SYMBOL(vm_get_page_prot);
-- 
2.25.1

