On 04/18/2015 06:47 AM, Chris Wilson wrote:
On Fri, Apr 17, 2015 at 02:21:12PM -0700, yu.dai@xxxxxxxxx wrote:
> From: Alex Dai <yu.dai@xxxxxxxxx>
>
> All gem objects used by GuC are pinned to ggtt space out of range
> [0, WOPCM size]. In GuC address space mapping, [0, WPOCM size] is
> used internally for its Boot ROM, SRAM etc. Currently this WPOCM
> size is 512K. This is done by using of PIN_OFFSET_BIAS.
If the region is reserved, remove that region from the GGTT drm_mm range
manager. Then the restriction is applied to all objects and not in a
hodge-podge fashion like this.
I don't think I have clearly explained this. GTT range [0, WPOCM size]
can't be used by GuC firmware, but still others can use it without any
issue. PIN_OFFSET_BIAS is great for such use case.
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