flush_kernel_vmap_range() invalidate_kernel_vmap_range() API not exists for MIPS

flush_kernel_vmap_range() invalidate_kernel_vmap_range() API not exists for MIPS

[naveen yadav]

Dear All,

We are working on 2.6.35.9 linux kernel on MIPS 34kce core and our
cache is VIVT having cache aliasing .
When I check the implementation on ARM I can check the implemenation
exists , but there is not similar implementation exists on MIPS.
These API's are used by XFS module:

static inline void flush_kernel_vmap_range(void *vaddr, int size)
static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
static inline void flush_kernel_dcache_page(struct page *page)


I can check implementation on ARM at
http://git.kernel.org/?p=linux/kernel/git/longterm/linux-2.6.34.y.git;a=commit;h=252a9afff76097667429b583e8b5b170b47665a4
 and
----------------------------------------------------------------------------------------------------------------------------
--- a/arch/arm/include/asm/cacheflush.h+++ b/arch/arm/include/asm/cacheflush.h
@@ -432,6 +432,16
 @@ static inline void __flush_icache_all(void)
  : "r" (0)); #endif }
+static inline void flush_kernel_vmap_range(void *addr, int size)
+{
+       if ((cache_is_vivt() || cache_is_vipt_aliasing()))
+         __cpuc_flush_dcache_area(addr, (size_t)size);
+}
+static inline void invalidate_kernel_vmap_range(void *addr, int size)
+{
+       if ((cache_is_vivt() || cache_is_vipt_aliasing()))
+         __cpuc_flush_dcache_area(addr, (size_t)size);
+}
-------------------------------------------------------------------------------------------------------------------------------------


http://git.kernel.org/?p=linux/kernel/git/longterm/linux-2.6.34.y.git;a=blobdiff;f=arch/arm/include/asm/cacheflush.h;h=1a711ea8418b6045c581a576caa3f85496ee2673;hp=bb7d695f3900f70d635a3597cd19d7cb68c0d732;hb=73be1591579084a8103a7005dd3172f3e9dd7362;hpb=44b7532b8b464f606053562400719c9c21276037

======================================================
+#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+static inline void flush_kernel_dcache_page(struct page *page)
+{
+       /* highmem pages are always flushed upon kunmap already */
+       if ((cache_is_vivt() || cache_is_vipt_aliasing()) && !PageHighMem(page))
+               __cpuc_flush_dcache_page(page_address(page));
+}
+
==========================================================


Is there any similar API exists for MIPS.  I want to use for XFS these API's

thanks

Re: flush_kernel_vmap_range() invalidate_kernel_vmap_range() API not exists for MIPS

[Ralf Baechle]

On Fri, Mar 25, 2011 at 02:38:13PM +0530, naveen yadav wrote:

> We are working on 2.6.35.9 linux kernel on MIPS 34kce core and our
> cache is VIVT having cache aliasing .

No, they're VIPT unless you successfully modified your 34K core to
change it from a less than perfect cache design to the most lunatic
cache policy known to man kind ...

> When I check the implementation on ARM I can check the implemenation
> exists , but there is not similar implementation exists on MIPS.
> These API's are used by XFS module:
> 
> static inline void flush_kernel_vmap_range(void *vaddr, int size)
> static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
> static inline void flush_kernel_dcache_page(struct page *page)

A known problem for (too ...) long.  I'll finally take care of it.

  Ralf

Re: flush_kernel_vmap_range() invalidate_kernel_vmap_range() API not exists for MIPS

[naveen yadav]

I am sorry, Yes they are VIPT,


On Fri, Mar 25, 2011 at 10:57 PM, Ralf Baechle <ralf@linux-mips.org> wrote:
> On Fri, Mar 25, 2011 at 02:38:13PM +0530, naveen yadav wrote:
>
>> We are working on 2.6.35.9 linux kernel on MIPS 34kce core and our
>> cache is VIVT having cache aliasing .
>
> No, they're VIPT unless you successfully modified your 34K core to
> change it from a less than perfect cache design to the most lunatic
> cache policy known to man kind ...
>
>> When I check the implementation on ARM I can check the implemenation
>> exists , but there is not similar implementation exists on MIPS.
>> These API's are used by XFS module:
>>
>> static inline void flush_kernel_vmap_range(void *vaddr, int size)
>> static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
>> static inline void flush_kernel_dcache_page(struct page *page)
>
> A known problem for (too ...) long.  I'll finally take care of it.
>
>  Ralf
>

Re: flush_kernel_vmap_range() invalidate_kernel_vmap_range() API not exists for MIPS

[naveen yadav]

Hi Ralf,

Have you got time to look into this issue.

Regards


On Tue, Mar 29, 2011 at 11:24 AM, naveen yadav <yad.naveen@gmail.com> wrote:
> I am sorry, Yes they are VIPT,
>
>
> On Fri, Mar 25, 2011 at 10:57 PM, Ralf Baechle <ralf@linux-mips.org> wrote:
>> On Fri, Mar 25, 2011 at 02:38:13PM +0530, naveen yadav wrote:
>>
>>> We are working on 2.6.35.9 linux kernel on MIPS 34kce core and our
>>> cache is VIVT having cache aliasing .
>>
>> No, they're VIPT unless you successfully modified your 34K core to
>> change it from a less than perfect cache design to the most lunatic
>> cache policy known to man kind ...
>>
>>> When I check the implementation on ARM I can check the implemenation
>>> exists , but there is not similar implementation exists on MIPS.
>>> These API's are used by XFS module:
>>>
>>> static inline void flush_kernel_vmap_range(void *vaddr, int size)
>>> static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
>>> static inline void flush_kernel_dcache_page(struct page *page)
>>
>> A known problem for (too ...) long.  I'll finally take care of it.
>>
>>  Ralf
>>
>