linux-kernel - [RFC V1 22/31] openrisc/mm: Enable ARCH_HAS_VM_GET_PAGE

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Message-Id: <1643029028-12710-23-git-send-email-anshuman.khandual@arm.com>
Date:   Mon, 24 Jan 2022 18:26:59 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, hch@...radead.org,
        akpm@...ux-foundation.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Jonas Bonn <jonas@...thpole.se>, openrisc@...ts.librecores.org
Subject: [RFC V1 22/31] openrisc/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.

Cc: Jonas Bonn <jonas@...thpole.se>
Cc: openrisc@...ts.librecores.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/openrisc/Kconfig               |  1 +
 arch/openrisc/include/asm/pgtable.h | 18 -------------
 arch/openrisc/mm/init.c             | 41 +++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 18 deletions(-)

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index f724b3f1aeed..842a61426816 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -10,6 +10,7 @@ config OPENRISC
 	select ARCH_HAS_DMA_SET_UNCACHED
 	select ARCH_HAS_DMA_CLEAR_UNCACHED
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select COMMON_CLK
 	select OF
 	select OF_EARLY_FLATTREE
diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
index cdd657f80bfa..fe686c4b7065 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -176,24 +176,6 @@ extern void paging_init(void);
 	__pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE \
 		 | _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | _PAGE_CI)
 
-#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
-
 /* zero page used for uninitialized stuff */
 extern unsigned long empty_zero_page[2048];
 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index 97305bde1b16..c9f5e7d6bb59 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -210,3 +210,44 @@ void __init mem_init(void)
 	mem_init_done = 1;
 	return;
 }
+
+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_READ | VM_WRITE:
+		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_READ | VM_WRITE:
+		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_READ | VM_WRITE:
+		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_READ | VM_WRITE:
+		return PAGE_SHARED_X;
+	default:
+		BUILD_BUG();
+	}
+}
+EXPORT_SYMBOL(vm_get_page_prot);
-- 
2.25.1