Re: [RFC PATCH 4/7] arm64: tlbflush.h: add __tlbi() macro

Punit Agrawal
2016-08-19T13:34:56Z

Will Deacon <will.deacon@arm.com> writes:

> On Tue, Aug 16, 2016 at 11:45:09AM +0100, Punit Agrawal wrote:
>> From: Mark Rutland <mark.rutland@arm.com>
>>
>> As with dsb() and isb(), add a __tbli() helper so that we can avoid
>
> Minor typo: s/__tbli/__tlbi/

Thanks for spotting. I've fixed this locally now.

>
>> distracting asm boilerplate every time we want a TLBI. As some TLBI
>> operations take an argument while others do not, some pre-processor is
>> used to handle these two cases with different assembly blocks.
>>
>> The existing tlbflush.h code is moved over to use the helper.
>>
>> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>> Cc: Will Deacon <will.deacon@arm.com>
>> [ rename helper to __tlbi, update commit log ]
>> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
>> ---
>> arch/arm64/include/asm/tlbflush.h | 31 +++++++++++++++++++++++--------
>> 1 file changed, 23 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
>> index b460ae2..d57a0be 100644
>> --- a/arch/arm64/include/asm/tlbflush.h
>> +++ b/arch/arm64/include/asm/tlbflush.h
>> @@ -25,6 +25,21 @@
>> #include <asm/cputype.h>
>>
>> /*
>> + * Raw TLBI operations. Drivers and most kernel code should use the TLB
>> + * management routines below in preference to these. Where necessary, these can
>> + * be used to avoid asm() boilerplate.
>> + *
>> + * Can be used as __tlbi(op) or __tlbi(op, arg), depending on whether a
>> + * particular TLBI op takes an argument or not. The macros below handle invoking
>> + * the asm with or without the register argument as appropriate.
>> + */
>> +#define TLBI_0(op, arg) asm ("tlbi " #op)
>> +#define TLBI_1(op, arg) asm ("tlbi " #op ", %0" : : "r" (arg))
>> +#define TLBI_N(op, arg, n, ...) TLBI_##n(op, arg)
>
> Should this be prefixed with underscores, too?

As these were only used in the definition of __tlbi() I didn't
prefix them. I'll add them for the next posting.

Thanks for taking a look.

Punit

>
> Will
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