Am 08.11.2016 um 08:31 schrieb Michel Dänzer:
On 07/11/16 06:33 PM, Christian König wrote:
Am 07.11.2016 um 10:29 schrieb Michel Dänzer:
On 07/11/16 06:21 PM, Christian König wrote:
From: Christian König <[email protected]>
We don't need to use the PCI BAR on APUs. This allows us to access
the full VRAM directly without being limited by the BAR size.
Signed-off-by: Christian König <[email protected]>
The series is
Reviewed-by: Michel Dänzer <[email protected]>
We could also drop the HDP flushes / invalidates in this case, right?
Could be, but I'm not 100% sure how those are actually wired up on APUs.
Might be that they are NOPs anyway, but could be that at least the
flushes are still vital.
My assumption is that since CPU access to VRAM doesn't go through the
HDP at all with this change, HDP flushes / invalidates can't have any
useful effect.
Well writes to GTT still use the HDP if I understand it correctly.
So we still need to handle either flushes or invalidations (I doesn't of
hand remember which was that).
Regards,
Christian.
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