diff mbox series

[V6,21/26] m68k/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT

Message ID 20220630051630.1718927-22-anshuman.khandual@arm.com
State New
Headers show
Series mm/mmap: Drop __SXXX/__PXXX macros from across platforms | expand

Commit Message

Anshuman Khandual June 30, 2022, 5:16 a.m. UTC 
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.

Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/m68k/Kconfig                        |  1 +
 arch/m68k/include/asm/mcf_pgtable.h      | 54 -----------------------
 arch/m68k/include/asm/motorola_pgtable.h | 22 ----------
 arch/m68k/include/asm/sun3_pgtable.h     | 17 --------
 arch/m68k/mm/mcfmmu.c                    | 55 ++++++++++++++++++++++++
 arch/m68k/mm/motorola.c                  | 20 +++++++++
 arch/m68k/mm/sun3mmu.c                   | 20 +++++++++
 7 files changed, 96 insertions(+), 93 deletions(-)

Comments

Geert Uytterhoeven July 6, 2022, 10:03 a.m. UTC | #1 
Hi Anshuman,

On Thu, Jun 30, 2022 at 7:19 AM Anshuman Khandual
<anshuman.khandual@arm.com> wrote:
> 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.
>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>

Thanks for your patch!

> --- a/arch/m68k/include/asm/mcf_pgtable.h
> +++ b/arch/m68k/include/asm/mcf_pgtable.h
> @@ -91,60 +91,6 @@
>   * for use. In general, the bit positions are xwr, and P-items are
>   * private, the S-items are shared.
>   */

The comment above should be removed, too.

> -#define __P000         PAGE_NONE
> -#define __P001         __pgprot(CF_PAGE_VALID \
> -                                | CF_PAGE_ACCESSED \
> -                                | CF_PAGE_READABLE)

> --- a/arch/m68k/include/asm/motorola_pgtable.h
> +++ b/arch/m68k/include/asm/motorola_pgtable.h
> @@ -83,28 +83,6 @@ extern unsigned long mm_cachebits;
>  #define PAGE_COPY_C    __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
>  #define PAGE_READONLY_C        __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)

You might move the *_C definitions above into arch/m68k/mm/motorola.c
as well, as they are only used in the latter.

>
> -/*
> - * The m68k can't do page protection for execute, and considers that the same are read.
> - * Also, write permissions imply read permissions. This is the closest we can get..
> - */
> -#define __P000 PAGE_NONE_C
> -#define __P001 PAGE_READONLY_C
> -#define __P010 PAGE_COPY_C
> -#define __P011 PAGE_COPY_C
> -#define __P100 PAGE_READONLY_C
> -#define __P101 PAGE_READONLY_C
> -#define __P110 PAGE_COPY_C
> -#define __P111 PAGE_COPY_C
> -
> -#define __S000 PAGE_NONE_C
> -#define __S001 PAGE_READONLY_C
> -#define __S010 PAGE_SHARED_C
> -#define __S011 PAGE_SHARED_C
> -#define __S100 PAGE_READONLY_C
> -#define __S101 PAGE_READONLY_C
> -#define __S110 PAGE_SHARED_C
> -#define __S111 PAGE_SHARED_C
> -
>  #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
>
>  /*
> diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
> index 5e4e753f0d24..9d919491765b 100644
> --- a/arch/m68k/include/asm/sun3_pgtable.h
> +++ b/arch/m68k/include/asm/sun3_pgtable.h
> @@ -71,23 +71,6 @@
>   * protection settings, valid (implying read and execute) and writeable. These
>   * are as close as we can get...
>   */

The comment above should be removed, too.

> -#define __P000 PAGE_NONE
> -#define __P001 PAGE_READONLY

With the above fixed:
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Anshuman Khandual July 6, 2022, 11:15 a.m. UTC | #2 
On 7/6/22 15:33, Geert Uytterhoeven wrote:
> Hi Anshuman,
> 
> On Thu, Jun 30, 2022 at 7:19 AM Anshuman Khandual
> <anshuman.khandual@arm.com> wrote:
>> 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.
>>
>> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
>> Cc: linux-m68k@lists.linux-m68k.org
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> 
> Thanks for your patch!
> 
>> --- a/arch/m68k/include/asm/mcf_pgtable.h
>> +++ b/arch/m68k/include/asm/mcf_pgtable.h
>> @@ -91,60 +91,6 @@
>>   * for use. In general, the bit positions are xwr, and P-items are
>>   * private, the S-items are shared.
>>   */
> 
> The comment above should be removed, too.

Sure, will do.

> 
>> -#define __P000         PAGE_NONE
>> -#define __P001         __pgprot(CF_PAGE_VALID \
>> -                                | CF_PAGE_ACCESSED \
>> -                                | CF_PAGE_READABLE)
> 
>> --- a/arch/m68k/include/asm/motorola_pgtable.h
>> +++ b/arch/m68k/include/asm/motorola_pgtable.h
>> @@ -83,28 +83,6 @@ extern unsigned long mm_cachebits;
>>  #define PAGE_COPY_C    __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
>>  #define PAGE_READONLY_C        __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
> 
> You might move the *_C definitions above into arch/m68k/mm/motorola.c
> as well, as they are only used in the latter.

Okay, will do.

> 
>>
>> -/*
>> - * The m68k can't do page protection for execute, and considers that the same are read.
>> - * Also, write permissions imply read permissions. This is the closest we can get..
>> - */
>> -#define __P000 PAGE_NONE_C
>> -#define __P001 PAGE_READONLY_C
>> -#define __P010 PAGE_COPY_C
>> -#define __P011 PAGE_COPY_C
>> -#define __P100 PAGE_READONLY_C
>> -#define __P101 PAGE_READONLY_C
>> -#define __P110 PAGE_COPY_C
>> -#define __P111 PAGE_COPY_C
>> -
>> -#define __S000 PAGE_NONE_C
>> -#define __S001 PAGE_READONLY_C
>> -#define __S010 PAGE_SHARED_C
>> -#define __S011 PAGE_SHARED_C
>> -#define __S100 PAGE_READONLY_C
>> -#define __S101 PAGE_READONLY_C
>> -#define __S110 PAGE_SHARED_C
>> -#define __S111 PAGE_SHARED_C
>> -
>>  #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
>>
>>  /*
>> diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
>> index 5e4e753f0d24..9d919491765b 100644
>> --- a/arch/m68k/include/asm/sun3_pgtable.h
>> +++ b/arch/m68k/include/asm/sun3_pgtable.h
>> @@ -71,23 +71,6 @@
>>   * protection settings, valid (implying read and execute) and writeable. These
>>   * are as close as we can get...
>>   */
> 
> The comment above should be removed, too.

Sure, will do.

> 
>> -#define __P000 PAGE_NONE
>> -#define __P001 PAGE_READONLY
> 
> With the above fixed:
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>
diff mbox series

Patch

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 936cce42ae9a..49aa0cf13e96 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -7,6 +7,7 @@  config M68K
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DMA_PREP_COHERENT if HAS_DMA && MMU && !COLDFIRE
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
+	select ARCH_HAS_VM_GET_PAGE_PROT
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select ARCH_NO_PREEMPT if !COLDFIRE
diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index 94f38d76e278..0e9c1b28dcab 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -91,60 +91,6 @@ 
  * for use. In general, the bit positions are xwr, and P-items are
  * private, the S-items are shared.
  */
-#define __P000		PAGE_NONE
-#define __P001		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE)
-#define __P010		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_WRITABLE)
-#define __P011		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE \
-				 | CF_PAGE_WRITABLE)
-#define __P100		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_EXEC)
-#define __P101		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE \
-				 | CF_PAGE_EXEC)
-#define __P110		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_WRITABLE \
-				 | CF_PAGE_EXEC)
-#define __P111		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE \
-				 | CF_PAGE_WRITABLE \
-				 | CF_PAGE_EXEC)
-
-#define __S000		PAGE_NONE
-#define __S001		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE)
-#define __S010		PAGE_SHARED
-#define __S011		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_SHARED \
-				 | CF_PAGE_READABLE)
-#define __S100		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_EXEC)
-#define __S101		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_READABLE \
-				 | CF_PAGE_EXEC)
-#define __S110		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_SHARED \
-				 | CF_PAGE_EXEC)
-#define __S111		__pgprot(CF_PAGE_VALID \
-				 | CF_PAGE_ACCESSED \
-				 | CF_PAGE_SHARED \
-				 | CF_PAGE_READABLE \
-				 | CF_PAGE_EXEC)
-
 #define PTE_MASK	PAGE_MASK
 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
 
diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
index 7c9b56e2a750..63aaece0722f 100644
--- a/arch/m68k/include/asm/motorola_pgtable.h
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -83,28 +83,6 @@  extern unsigned long mm_cachebits;
 #define PAGE_COPY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
 #define PAGE_READONLY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
 
-/*
- * The m68k can't do page protection for execute, and considers that the same are read.
- * Also, write permissions imply read permissions. This is the closest we can get..
- */
-#define __P000	PAGE_NONE_C
-#define __P001	PAGE_READONLY_C
-#define __P010	PAGE_COPY_C
-#define __P011	PAGE_COPY_C
-#define __P100	PAGE_READONLY_C
-#define __P101	PAGE_READONLY_C
-#define __P110	PAGE_COPY_C
-#define __P111	PAGE_COPY_C
-
-#define __S000	PAGE_NONE_C
-#define __S001	PAGE_READONLY_C
-#define __S010	PAGE_SHARED_C
-#define __S011	PAGE_SHARED_C
-#define __S100	PAGE_READONLY_C
-#define __S101	PAGE_READONLY_C
-#define __S110	PAGE_SHARED_C
-#define __S111	PAGE_SHARED_C
-
 #define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
 
 /*
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
index 5e4e753f0d24..9d919491765b 100644
--- a/arch/m68k/include/asm/sun3_pgtable.h
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -71,23 +71,6 @@ 
  * protection settings, valid (implying read and execute) and writeable. These
  * are as close as we can get...
  */
-#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
 
 /* Use these fake page-protections on PMDs. */
 #define SUN3_PMD_VALID	(0x00000001)
diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
index 6f1f25125294..70aa0979e027 100644
--- a/arch/m68k/mm/mcfmmu.c
+++ b/arch/m68k/mm/mcfmmu.c
@@ -234,3 +234,58 @@  void steal_context(void)
 	destroy_context(mm);
 }
 
+static const pgprot_t protection_map[16] = {
+	[VM_NONE]					= PAGE_NONE,
+	[VM_READ]					= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE),
+	[VM_WRITE]					= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_WRITABLE),
+	[VM_WRITE | VM_READ]				= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE |
+								   CF_PAGE_WRITABLE),
+	[VM_EXEC]					= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_EXEC),
+	[VM_EXEC | VM_READ]				= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE |
+								   CF_PAGE_EXEC),
+	[VM_EXEC | VM_WRITE]				= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_WRITABLE |
+								   CF_PAGE_EXEC),
+	[VM_EXEC | VM_WRITE | VM_READ]			=  __pgprot(CF_PAGE_VALID |
+								    CF_PAGE_ACCESSED |
+								    CF_PAGE_READABLE |
+								    CF_PAGE_WRITABLE |
+								    CF_PAGE_EXEC),
+	[VM_SHARED]					= PAGE_NONE,
+	[VM_SHARED | VM_READ]				= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE),
+	[VM_SHARED | VM_WRITE]				= PAGE_SHARED,
+	[VM_SHARED | VM_WRITE | VM_READ]		= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE |
+								   CF_PAGE_SHARED),
+	[VM_SHARED | VM_EXEC]				= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_EXEC),
+	[VM_SHARED | VM_EXEC | VM_READ]			= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE |
+								   CF_PAGE_EXEC),
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_SHARED |
+								   CF_PAGE_EXEC),
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= __pgprot(CF_PAGE_VALID |
+								   CF_PAGE_ACCESSED |
+								   CF_PAGE_READABLE |
+								   CF_PAGE_SHARED |
+								   CF_PAGE_EXEC)
+};
+DECLARE_VM_GET_PAGE_PROT
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index df7f797c908a..31fba64bc530 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -382,6 +382,26 @@  static void __init map_node(int node)
 #endif
 }
 
+static pgprot_t protection_map[16] __ro_after_init = {
+	[VM_NONE]					= PAGE_NONE_C,
+	[VM_READ]					= PAGE_READONLY_C,
+	[VM_WRITE]					= PAGE_COPY_C,
+	[VM_WRITE | VM_READ]				= PAGE_COPY_C,
+	[VM_EXEC]					= PAGE_READONLY_C,
+	[VM_EXEC | VM_READ]				= PAGE_READONLY_C,
+	[VM_EXEC | VM_WRITE]				= PAGE_COPY_C,
+	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_COPY_C,
+	[VM_SHARED]					= PAGE_NONE_C,
+	[VM_SHARED | VM_READ]				= PAGE_READONLY_C,
+	[VM_SHARED | VM_WRITE]				= PAGE_SHARED_C,
+	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_SHARED_C,
+	[VM_SHARED | VM_EXEC]				= PAGE_READONLY_C,
+	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_READONLY_C,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_SHARED_C,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_SHARED_C
+};
+DECLARE_VM_GET_PAGE_PROT
+
 /*
  * paging_init() continues the virtual memory environment setup which
  * was begun by the code in arch/head.S.
diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c
index dad494224497..b619d0d4319c 100644
--- a/arch/m68k/mm/sun3mmu.c
+++ b/arch/m68k/mm/sun3mmu.c
@@ -95,3 +95,23 @@  void __init paging_init(void)
 
 
 }
+
+static const pgprot_t protection_map[16] = {
+	[VM_NONE]					= PAGE_NONE,
+	[VM_READ]					= PAGE_READONLY,
+	[VM_WRITE]					= PAGE_COPY,
+	[VM_WRITE | VM_READ]				= PAGE_COPY,
+	[VM_EXEC]					= PAGE_READONLY,
+	[VM_EXEC | VM_READ]				= PAGE_READONLY,
+	[VM_EXEC | VM_WRITE]				= PAGE_COPY,
+	[VM_EXEC | VM_WRITE | VM_READ]			= PAGE_COPY,
+	[VM_SHARED]					= PAGE_NONE,
+	[VM_SHARED | VM_READ]				= PAGE_READONLY,
+	[VM_SHARED | VM_WRITE]				= PAGE_SHARED,
+	[VM_SHARED | VM_WRITE | VM_READ]		= PAGE_SHARED,
+	[VM_SHARED | VM_EXEC]				= PAGE_READONLY,
+	[VM_SHARED | VM_EXEC | VM_READ]			= PAGE_READONLY,
+	[VM_SHARED | VM_EXEC | VM_WRITE]		= PAGE_SHARED,
+	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= PAGE_SHARED
+};
+DECLARE_VM_GET_PAGE_PROT