* [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
[not found] <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com>
@ 2022-01-24 12:56 ` Anshuman Khandual
2022-02-03 18:15 ` Mike Rapoport
0 siblings, 1 reply; 4+ messages in thread
From: Anshuman Khandual @ 2022-01-24 12:56 UTC (permalink / raw)
To: linux-mm
Cc: Anshuman Khandual, linux-kernel, hch, Paul Mackerras, akpm,
linuxppc-dev
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. While here, this also
localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot().
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/mman.h | 3 +-
arch/powerpc/include/asm/pgtable.h | 19 ------------
arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++
4 files changed, 49 insertions(+), 21 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b779603978e1..ddb4a3687c05 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -135,6 +135,7 @@ config PPC
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UACCESS_FLUSHCACHE
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_KEEP_MEMBLOCK
select ARCH_MIGHT_HAVE_PC_PARPORT
diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
index 7cb6d18f5cd6..7b10c2031e82 100644
--- a/arch/powerpc/include/asm/mman.h
+++ b/arch/powerpc/include/asm/mman.h
@@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
}
#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
-static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
+static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags)
{
#ifdef CONFIG_PPC_MEM_KEYS
return (vm_flags & VM_SAO) ?
@@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
#endif
}
-#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
{
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index d564d0ecd4cd..3cbb6de20f9d 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -20,25 +20,6 @@ struct mm_struct;
#include <asm/nohash/pgtable.h>
#endif /* !CONFIG_PPC_BOOK3S */
-/* Note due to the way vm flags are laid out, the bits are XWR */
-#define __P000 PAGE_NONE
-#define __P001 PAGE_READONLY
-#define __P010 PAGE_COPY
-#define __P011 PAGE_COPY
-#define __P100 PAGE_READONLY_X
-#define __P101 PAGE_READONLY_X
-#define __P110 PAGE_COPY_X
-#define __P111 PAGE_COPY_X
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_READONLY
-#define __S010 PAGE_SHARED
-#define __S011 PAGE_SHARED
-#define __S100 PAGE_READONLY_X
-#define __S101 PAGE_READONLY_X
-#define __S110 PAGE_SHARED_X
-#define __S111 PAGE_SHARED_X
-
#ifndef __ASSEMBLY__
#ifndef MAX_PTRS_PER_PGD
diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
index c475cf810aa8..7f05e7903bd2 100644
--- a/arch/powerpc/mm/mmap.c
+++ b/arch/powerpc/mm/mmap.c
@@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
+
+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 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_X;
+ case VM_EXEC | VM_READ:
+ return PAGE_READONLY_X;
+ case VM_EXEC | VM_WRITE:
+ return PAGE_COPY_X;
+ 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;
+ 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_X;
+ case VM_SHARED | VM_EXEC | VM_READ:
+ return PAGE_READONLY_X;
+ case VM_SHARED | VM_EXEC | VM_WRITE:
+ return PAGE_SHARED_X;
+ case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
+ return PAGE_SHARED_X;
+ 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(powerpc_vm_get_page_prot(vm_flags)));
+}
+EXPORT_SYMBOL(vm_get_page_prot);
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
2022-01-24 12:56 ` [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
@ 2022-02-03 18:15 ` Mike Rapoport
2022-02-04 2:57 ` Anshuman Khandual
0 siblings, 1 reply; 4+ messages in thread
From: Mike Rapoport @ 2022-02-03 18:15 UTC (permalink / raw)
To: Anshuman Khandual
Cc: linux-kernel, hch, linux-mm, Paul Mackerras, akpm, linuxppc-dev
On Mon, Jan 24, 2022 at 06:26:41PM +0530, 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. While here, this also
> localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot().
>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/include/asm/mman.h | 3 +-
> arch/powerpc/include/asm/pgtable.h | 19 ------------
> arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++
> 4 files changed, 49 insertions(+), 21 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index b779603978e1..ddb4a3687c05 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -135,6 +135,7 @@ config PPC
> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> select ARCH_HAS_UACCESS_FLUSHCACHE
> select ARCH_HAS_UBSAN_SANITIZE_ALL
> + select ARCH_HAS_VM_GET_PAGE_PROT
> select ARCH_HAVE_NMI_SAFE_CMPXCHG
> select ARCH_KEEP_MEMBLOCK
> select ARCH_MIGHT_HAVE_PC_PARPORT
> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
> index 7cb6d18f5cd6..7b10c2031e82 100644
> --- a/arch/powerpc/include/asm/mman.h
> +++ b/arch/powerpc/include/asm/mman.h
> @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
> }
> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
>
> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
> +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags)
> {
> #ifdef CONFIG_PPC_MEM_KEYS
> return (vm_flags & VM_SAO) ?
> @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
> return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
> #endif
> }
> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
>
> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
> {
> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> index d564d0ecd4cd..3cbb6de20f9d 100644
> --- a/arch/powerpc/include/asm/pgtable.h
> +++ b/arch/powerpc/include/asm/pgtable.h
> @@ -20,25 +20,6 @@ struct mm_struct;
> #include <asm/nohash/pgtable.h>
> #endif /* !CONFIG_PPC_BOOK3S */
>
> -/* Note due to the way vm flags are laid out, the bits are XWR */
> -#define __P000 PAGE_NONE
> -#define __P001 PAGE_READONLY
> -#define __P010 PAGE_COPY
> -#define __P011 PAGE_COPY
> -#define __P100 PAGE_READONLY_X
> -#define __P101 PAGE_READONLY_X
> -#define __P110 PAGE_COPY_X
> -#define __P111 PAGE_COPY_X
> -
> -#define __S000 PAGE_NONE
> -#define __S001 PAGE_READONLY
> -#define __S010 PAGE_SHARED
> -#define __S011 PAGE_SHARED
> -#define __S100 PAGE_READONLY_X
> -#define __S101 PAGE_READONLY_X
> -#define __S110 PAGE_SHARED_X
> -#define __S111 PAGE_SHARED_X
> -
> #ifndef __ASSEMBLY__
>
> #ifndef MAX_PTRS_PER_PGD
> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
> index c475cf810aa8..7f05e7903bd2 100644
> --- a/arch/powerpc/mm/mmap.c
> +++ b/arch/powerpc/mm/mmap.c
> @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> mm->get_unmapped_area = arch_get_unmapped_area_topdown;
> }
> }
> +
> +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 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_X;
> + case VM_EXEC | VM_READ:
> + return PAGE_READONLY_X;
> + case VM_EXEC | VM_WRITE:
> + return PAGE_COPY_X;
> + 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;
> + 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_X;
> + case VM_SHARED | VM_EXEC | VM_READ:
> + return PAGE_READONLY_X;
> + case VM_SHARED | VM_EXEC | VM_WRITE:
> + return PAGE_SHARED_X;
> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
> + return PAGE_SHARED_X;
> + 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(powerpc_vm_get_page_prot(vm_flags)));
Any reason to keep powerpc_vm_get_page_prot() rather than open code it
here?
This applies to other architectures that implement arch_vm_get_page_prot()
and/or arch_filter_pgprot() as well.
> +}
> +EXPORT_SYMBOL(vm_get_page_prot);
> --
> 2.25.1
>
>
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
2022-02-03 18:15 ` Mike Rapoport
@ 2022-02-04 2:57 ` Anshuman Khandual
2022-02-04 4:44 ` Mike Rapoport
0 siblings, 1 reply; 4+ messages in thread
From: Anshuman Khandual @ 2022-02-04 2:57 UTC (permalink / raw)
To: Mike Rapoport
Cc: linux-kernel, hch, linux-mm, Paul Mackerras, akpm, linuxppc-dev
On 2/3/22 11:45 PM, Mike Rapoport wrote:
> On Mon, Jan 24, 2022 at 06:26:41PM +0530, 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. While here, this also
>> localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot().
>>
>> Cc: Michael Ellerman <mpe@ellerman.id.au>
>> Cc: Paul Mackerras <paulus@samba.org>
>> Cc: linuxppc-dev@lists.ozlabs.org
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>> ---
>> arch/powerpc/Kconfig | 1 +
>> arch/powerpc/include/asm/mman.h | 3 +-
>> arch/powerpc/include/asm/pgtable.h | 19 ------------
>> arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++
>> 4 files changed, 49 insertions(+), 21 deletions(-)
>>
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index b779603978e1..ddb4a3687c05 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -135,6 +135,7 @@ config PPC
>> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>> select ARCH_HAS_UACCESS_FLUSHCACHE
>> select ARCH_HAS_UBSAN_SANITIZE_ALL
>> + select ARCH_HAS_VM_GET_PAGE_PROT
>> select ARCH_HAVE_NMI_SAFE_CMPXCHG
>> select ARCH_KEEP_MEMBLOCK
>> select ARCH_MIGHT_HAVE_PC_PARPORT
>> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
>> index 7cb6d18f5cd6..7b10c2031e82 100644
>> --- a/arch/powerpc/include/asm/mman.h
>> +++ b/arch/powerpc/include/asm/mman.h
>> @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
>> }
>> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
>>
>> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
>> +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags)
>> {
>> #ifdef CONFIG_PPC_MEM_KEYS
>> return (vm_flags & VM_SAO) ?
>> @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
>> return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
>> #endif
>> }
>> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
>>
>> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
>> {
>> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
>> index d564d0ecd4cd..3cbb6de20f9d 100644
>> --- a/arch/powerpc/include/asm/pgtable.h
>> +++ b/arch/powerpc/include/asm/pgtable.h
>> @@ -20,25 +20,6 @@ struct mm_struct;
>> #include <asm/nohash/pgtable.h>
>> #endif /* !CONFIG_PPC_BOOK3S */
>>
>> -/* Note due to the way vm flags are laid out, the bits are XWR */
>> -#define __P000 PAGE_NONE
>> -#define __P001 PAGE_READONLY
>> -#define __P010 PAGE_COPY
>> -#define __P011 PAGE_COPY
>> -#define __P100 PAGE_READONLY_X
>> -#define __P101 PAGE_READONLY_X
>> -#define __P110 PAGE_COPY_X
>> -#define __P111 PAGE_COPY_X
>> -
>> -#define __S000 PAGE_NONE
>> -#define __S001 PAGE_READONLY
>> -#define __S010 PAGE_SHARED
>> -#define __S011 PAGE_SHARED
>> -#define __S100 PAGE_READONLY_X
>> -#define __S101 PAGE_READONLY_X
>> -#define __S110 PAGE_SHARED_X
>> -#define __S111 PAGE_SHARED_X
>> -
>> #ifndef __ASSEMBLY__
>>
>> #ifndef MAX_PTRS_PER_PGD
>> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
>> index c475cf810aa8..7f05e7903bd2 100644
>> --- a/arch/powerpc/mm/mmap.c
>> +++ b/arch/powerpc/mm/mmap.c
>> @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
>> mm->get_unmapped_area = arch_get_unmapped_area_topdown;
>> }
>> }
>> +
>> +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 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_X;
>> + case VM_EXEC | VM_READ:
>> + return PAGE_READONLY_X;
>> + case VM_EXEC | VM_WRITE:
>> + return PAGE_COPY_X;
>> + 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;
>> + 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_X;
>> + case VM_SHARED | VM_EXEC | VM_READ:
>> + return PAGE_READONLY_X;
>> + case VM_SHARED | VM_EXEC | VM_WRITE:
>> + return PAGE_SHARED_X;
>> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
>> + return PAGE_SHARED_X;
>> + 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(powerpc_vm_get_page_prot(vm_flags)));
> Any reason to keep powerpc_vm_get_page_prot() rather than open code it
> here?
>
> This applies to other architectures that implement arch_vm_get_page_prot()
> and/or arch_filter_pgprot() as well.
Just to minimize the code churn ! But I will be happy to open code them
here (and in other platforms) if that will be preferred.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
2022-02-04 2:57 ` Anshuman Khandual
@ 2022-02-04 4:44 ` Mike Rapoport
0 siblings, 0 replies; 4+ messages in thread
From: Mike Rapoport @ 2022-02-04 4:44 UTC (permalink / raw)
To: Anshuman Khandual
Cc: linux-kernel, hch, linux-mm, Paul Mackerras, akpm, linuxppc-dev
On Fri, Feb 04, 2022 at 08:27:37AM +0530, Anshuman Khandual wrote:
>
> On 2/3/22 11:45 PM, Mike Rapoport wrote:
> > On Mon, Jan 24, 2022 at 06:26:41PM +0530, 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. While here, this also
> >> localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot().
> >>
> >> Cc: Michael Ellerman <mpe@ellerman.id.au>
> >> Cc: Paul Mackerras <paulus@samba.org>
> >> Cc: linuxppc-dev@lists.ozlabs.org
> >> Cc: linux-kernel@vger.kernel.org
> >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> >> ---
> >> arch/powerpc/Kconfig | 1 +
> >> arch/powerpc/include/asm/mman.h | 3 +-
> >> arch/powerpc/include/asm/pgtable.h | 19 ------------
> >> arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++
> >> 4 files changed, 49 insertions(+), 21 deletions(-)
> >>
> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> >> index b779603978e1..ddb4a3687c05 100644
> >> --- a/arch/powerpc/Kconfig
> >> +++ b/arch/powerpc/Kconfig
> >> @@ -135,6 +135,7 @@ config PPC
> >> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> >> select ARCH_HAS_UACCESS_FLUSHCACHE
> >> select ARCH_HAS_UBSAN_SANITIZE_ALL
> >> + select ARCH_HAS_VM_GET_PAGE_PROT
> >> select ARCH_HAVE_NMI_SAFE_CMPXCHG
> >> select ARCH_KEEP_MEMBLOCK
> >> select ARCH_MIGHT_HAVE_PC_PARPORT
> >> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
> >> index 7cb6d18f5cd6..7b10c2031e82 100644
> >> --- a/arch/powerpc/include/asm/mman.h
> >> +++ b/arch/powerpc/include/asm/mman.h
> >> @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
> >> }
> >> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
> >>
> >> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
> >> +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags)
> >> {
> >> #ifdef CONFIG_PPC_MEM_KEYS
> >> return (vm_flags & VM_SAO) ?
> >> @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
> >> return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
> >> #endif
> >> }
> >> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
> >>
> >> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
> >> {
> >> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> >> index d564d0ecd4cd..3cbb6de20f9d 100644
> >> --- a/arch/powerpc/include/asm/pgtable.h
> >> +++ b/arch/powerpc/include/asm/pgtable.h
> >> @@ -20,25 +20,6 @@ struct mm_struct;
> >> #include <asm/nohash/pgtable.h>
> >> #endif /* !CONFIG_PPC_BOOK3S */
> >>
> >> -/* Note due to the way vm flags are laid out, the bits are XWR */
> >> -#define __P000 PAGE_NONE
> >> -#define __P001 PAGE_READONLY
> >> -#define __P010 PAGE_COPY
> >> -#define __P011 PAGE_COPY
> >> -#define __P100 PAGE_READONLY_X
> >> -#define __P101 PAGE_READONLY_X
> >> -#define __P110 PAGE_COPY_X
> >> -#define __P111 PAGE_COPY_X
> >> -
> >> -#define __S000 PAGE_NONE
> >> -#define __S001 PAGE_READONLY
> >> -#define __S010 PAGE_SHARED
> >> -#define __S011 PAGE_SHARED
> >> -#define __S100 PAGE_READONLY_X
> >> -#define __S101 PAGE_READONLY_X
> >> -#define __S110 PAGE_SHARED_X
> >> -#define __S111 PAGE_SHARED_X
> >> -
> >> #ifndef __ASSEMBLY__
> >>
> >> #ifndef MAX_PTRS_PER_PGD
> >> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
> >> index c475cf810aa8..7f05e7903bd2 100644
> >> --- a/arch/powerpc/mm/mmap.c
> >> +++ b/arch/powerpc/mm/mmap.c
> >> @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
> >> mm->get_unmapped_area = arch_get_unmapped_area_topdown;
> >> }
> >> }
> >> +
> >> +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 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_X;
> >> + case VM_EXEC | VM_READ:
> >> + return PAGE_READONLY_X;
> >> + case VM_EXEC | VM_WRITE:
> >> + return PAGE_COPY_X;
> >> + 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;
> >> + 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_X;
> >> + case VM_SHARED | VM_EXEC | VM_READ:
> >> + return PAGE_READONLY_X;
> >> + case VM_SHARED | VM_EXEC | VM_WRITE:
> >> + return PAGE_SHARED_X;
> >> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
> >> + return PAGE_SHARED_X;
> >> + 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(powerpc_vm_get_page_prot(vm_flags)));
> > Any reason to keep powerpc_vm_get_page_prot() rather than open code it
> > here?
> >
> > This applies to other architectures that implement arch_vm_get_page_prot()
> > and/or arch_filter_pgprot() as well.
>
> Just to minimize the code churn ! But I will be happy to open code them
> here (and in other platforms) if that will be preferred.
I think this will be clearer because all the processing will be at one place.
Besides, this way include/asm/pgtable.h becomes shorter and less crowded.
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-02-04 4:45 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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[not found] <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com>
2022-01-24 12:56 ` [RFC V1 04/31] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-02-03 18:15 ` Mike Rapoport
2022-02-04 2:57 ` Anshuman Khandual
2022-02-04 4:44 ` Mike Rapoport
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