[Intel-gfx] [PATCH] drm/mm: Support 4 GiB and larger ranges

[Thomas Hellstrom]

On 01/26/2015 11:51 PM, Dave Airlie wrote:
> On 23 January 2015 at 18:05, Thierry Reding <thierry.reding at gmail.com> wrote:
>> From: Thierry Reding <treding at nvidia.com>
>>
>> The current implementation is limited by the number of addresses that
>> fit into an unsigned long. This causes problems on 32-bit Tegra where
>> unsigned long is 32-bit but drm_mm is used to manage an IOVA space of
>> 4 GiB. Given the 32-bit limitation, the range is limited to 4 GiB - 1
>> (or 4 GiB - 4 KiB for page granularity).
>>
>> This commit changes the start and size of the range to be an unsigned
>> 64-bit integer, thus allowing much larger ranges to be supported.
> This seems fine to me, Chris, Daniel or Thomas, any objections?
>
> Dave.

This is perfectly fine with me, although I'm a bit curious why the
allocation granularity of the IOVA space needs to be 1 byte?

Thanks,
Thomas