[PATCH 9/9] drm/ttm: Sanity check mapping attributes on powerpc in ttm_io_prot()

[Michel Dänzer]

On 04.09.2014 18:34, Benjamin Herrenschmidt wrote:
> On Thu, 2014-09-04 at 16:52 +0900, Michel Dänzer wrote:
>>>    #endif
>>> +#if defined(__powerpc__) && !defined(CONFIG_NOT_COHERENT_CACHE)
>>> +     /*
>>> +      * Using a non-cachable mapping of system memory on
>>> +      * cache coherent powerpc's can be fatal, let's make
>>> +      * sure this doesn't happen and warn if it does. The
>>> +      * only exception is powermac with AGP which has to
>>> +      * take the risk.
>>> +      */
>>> +     if (!machine_is(powermac) &&
>>> +         ((caching_flags & TTM_PL_FLAG_SYSTEM) ||
>>> +          (caching_flags & TTM_PL_FLAG_TT))) {
>>> +             pr_err_once("TTM: Attempt to use a non-cached"
>>> +                         " mapping on RAM unsupported !\n");
>>> +             return tmp;
>>
>> NAK, this breaks AGP on PowerMacs.
>
> No it doesn't :-)

Yeah sorry, I was blind.


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer