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Date: Mon, 24 Jan 2022 18:26:43 +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>,
"David S. Miller" <davem@...emloft.net>,
Khalid Aziz <khalid.aziz@...cle.com>,
sparclinux@...r.kernel.org
Subject: [RFC V1 06/31] sparc/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: "David S. Miller" <davem@...emloft.net>
Cc: Khalid Aziz <khalid.aziz@...cle.com>
Cc: sparclinux@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
arch/sparc/Kconfig | 2 +
arch/sparc/include/asm/mman.h | 1 -
arch/sparc/include/asm/pgtable_32.h | 19 --------
arch/sparc/include/asm/pgtable_64.h | 19 --------
arch/sparc/mm/init_32.c | 41 +++++++++++++++++
arch/sparc/mm/init_64.c | 71 +++++++++++++++++++++--------
6 files changed, 95 insertions(+), 58 deletions(-)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 1cab1b284f1a..ff29156f2380 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -59,6 +59,7 @@ config SPARC32
select HAVE_UID16
select OLD_SIGACTION
select ZONE_DMA
+ select ARCH_HAS_VM_GET_PAGE_PROT
config SPARC64
def_bool 64BIT
@@ -84,6 +85,7 @@ config SPARC64
select PERF_USE_VMALLOC
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select HAVE_C_RECORDMCOUNT
+ select ARCH_HAS_VM_GET_PAGE_PROT
select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_DEBUG_PAGEALLOC
diff --git a/arch/sparc/include/asm/mman.h b/arch/sparc/include/asm/mman.h
index 274217e7ed70..874d21483202 100644
--- a/arch/sparc/include/asm/mman.h
+++ b/arch/sparc/include/asm/mman.h
@@ -46,7 +46,6 @@ static inline unsigned long sparc_calc_vm_prot_bits(unsigned long prot)
}
}
-#define arch_vm_get_page_prot(vm_flags) sparc_vm_get_page_prot(vm_flags)
static inline pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
{
return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index ffccfe3b22ed..060a435f96d6 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -64,25 +64,6 @@ void paging_init(void);
extern unsigned long ptr_in_current_pgd;
-/* xwr */
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_COPY
-#define __P011 PAGE_COPY
-#define __P100 PAGE_READONLY
-#define __P101 PAGE_READONLY
-#define __P110 PAGE_COPY
-#define __P111 PAGE_COPY
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_SHARED
-#define __S011 PAGE_SHARED
-#define __S100 PAGE_READONLY
-#define __S101 PAGE_READONLY
-#define __S110 PAGE_SHARED
-#define __S111 PAGE_SHARED
-
/* First physical page can be anywhere, the following is needed so that
* va-->pa and vice versa conversions work properly without performance
* hit for all __pa()/__va() operations.
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 4679e45c8348..a779418ceba9 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -187,25 +187,6 @@ bool kern_addr_valid(unsigned long addr);
#define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U
#define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V
-/* These are actually filled in at boot time by sun4{u,v}_pgprot_init() */
-#define __P000 __pgprot(0)
-#define __P001 __pgprot(0)
-#define __P010 __pgprot(0)
-#define __P011 __pgprot(0)
-#define __P100 __pgprot(0)
-#define __P101 __pgprot(0)
-#define __P110 __pgprot(0)
-#define __P111 __pgprot(0)
-
-#define __S000 __pgprot(0)
-#define __S001 __pgprot(0)
-#define __S010 __pgprot(0)
-#define __S011 __pgprot(0)
-#define __S100 __pgprot(0)
-#define __S101 __pgprot(0)
-#define __S110 __pgprot(0)
-#define __S111 __pgprot(0)
-
#ifndef __ASSEMBLY__
pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long);
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index 1e9f577f084d..efb3d6e6d7f6 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -302,3 +302,44 @@ void sparc_flush_page_to_ram(struct page *page)
__flush_page_to_ram(vaddr);
}
EXPORT_SYMBOL(sparc_flush_page_to_ram);
+
+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;
+ case VM_WRITE:
+ return PAGE_COPY;
+ case VM_READ | VM_WRITE:
+ return PAGE_COPY;
+ case VM_EXEC:
+ return PAGE_READONLY;
+ case VM_EXEC | VM_READ:
+ return PAGE_READONLY;
+ case VM_EXEC | VM_WRITE:
+ return PAGE_COPY;
+ case VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_COPY;
+ case VM_SHARED:
+ return PAGE_NONE;
+ case VM_SHARED | VM_READ:
+ return PAGE_READONLY;
+ case VM_SHARED | VM_WRITE:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_READ | VM_WRITE:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_EXEC:
+ return PAGE_READONLY;
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_READONLY;
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return PAGE_SHARED;
+ case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_SHARED;
+ default:
+ BUILD_BUG();
+ }
+}
+EXPORT_SYMBOL(vm_get_page_prot);
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 1b23639e2fcd..46b5366f7f69 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -50,6 +50,7 @@
#include <asm/cpudata.h>
#include <asm/setup.h>
#include <asm/irq.h>
+#include <asm/mman.h>
#include "init_64.h"
@@ -2641,29 +2642,13 @@ static void prot_init_common(unsigned long page_none,
{
PAGE_COPY = __pgprot(page_copy);
PAGE_SHARED = __pgprot(page_shared);
-
- protection_map[0x0] = __pgprot(page_none);
- protection_map[0x1] = __pgprot(page_readonly & ~page_exec_bit);
- protection_map[0x2] = __pgprot(page_copy & ~page_exec_bit);
- protection_map[0x3] = __pgprot(page_copy & ~page_exec_bit);
- protection_map[0x4] = __pgprot(page_readonly);
- protection_map[0x5] = __pgprot(page_readonly);
- protection_map[0x6] = __pgprot(page_copy);
- protection_map[0x7] = __pgprot(page_copy);
- protection_map[0x8] = __pgprot(page_none);
- protection_map[0x9] = __pgprot(page_readonly & ~page_exec_bit);
- protection_map[0xa] = __pgprot(page_shared & ~page_exec_bit);
- protection_map[0xb] = __pgprot(page_shared & ~page_exec_bit);
- protection_map[0xc] = __pgprot(page_readonly);
- protection_map[0xd] = __pgprot(page_readonly);
- protection_map[0xe] = __pgprot(page_shared);
- protection_map[0xf] = __pgprot(page_shared);
}
+static unsigned long page_none, page_shared, page_copy, page_readonly;
+static unsigned long page_exec_bit;
+
static void __init sun4u_pgprot_init(void)
{
- unsigned long page_none, page_shared, page_copy, page_readonly;
- unsigned long page_exec_bit;
int i;
PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
@@ -3183,3 +3168,51 @@ void copy_highpage(struct page *to, struct page *from)
}
}
EXPORT_SYMBOL(copy_highpage);
+
+static inline 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 __pgprot(page_none);
+ case VM_READ:
+ return __pgprot(page_readonly & ~page_exec_bit);
+ case VM_WRITE:
+ return __pgprot(page_copy & ~page_exec_bit);
+ case VM_READ | VM_WRITE:
+ return __pgprot(page_copy & ~page_exec_bit);
+ case VM_EXEC:
+ return __pgprot(page_readonly);
+ case VM_EXEC | VM_READ:
+ return __pgprot(page_readonly);
+ case VM_EXEC | VM_WRITE:
+ return __pgprot(page_copy);
+ case VM_EXEC | VM_READ | VM_WRITE:
+ return __pgprot(page_copy);
+ case VM_SHARED:
+ return __pgprot(page_none);
+ case VM_SHARED | VM_READ:
+ return __pgprot(page_readonly & ~page_exec_bit);
+ case VM_SHARED | VM_WRITE:
+ return __pgprot(page_shared & ~page_exec_bit);
+ case VM_SHARED | VM_READ | VM_WRITE:
+ return __pgprot(page_shared & ~page_exec_bit);
+ case VM_SHARED | VM_EXEC:
+ return __pgprot(page_readonly);
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return __pgprot(page_readonly);
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return __pgprot(page_shared);
+ case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+ return __pgprot(page_shared);
+ default:
+ BUILD_BUG();
+ }
+}
+
+pgprot_t vm_get_page_prot(unsigned long vm_flags)
+{
+ return __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) |
+ pgprot_val(sparc_vm_get_page_prot(vm_flags)));
+
+}
+EXPORT_SYMBOL(vm_get_page_prot);
--
2.25.1
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