In order to ensure seqno/irq coherency, we current read a ring register.
We are not sure quite how it works, only that is does. Experiments show
that e.g. doing a clflush(seqno) instead is not sufficient, but we can
remove the forcewake dance from the mmio access.
v2: Baytrail wants a clflush too.
On Mon, Jan 11, 2016 at 09:16:28AM +, Chris Wilson wrote:
> In order to ensure seqno/irq coherency, we current read a ring register.
currently
> We are not sure quite how it works, only that is does. Experiments show
> that e.g. doing a clflush(seqno) instead is not sufficient, but we can
> r
On 11/01/16 09:16, Chris Wilson wrote:
In order to ensure seqno/irq coherency, we current read a ring register.
We are not sure quite how it works, only that is does. Experiments show
that e.g. doing a clflush(seqno) instead is not sufficient, but we can
remove the forcewake dance from the mmio a
Dave Gordon writes:
> On 11/01/16 09:16, Chris Wilson wrote:
>> In order to ensure seqno/irq coherency, we current read a ring register.
>> We are not sure quite how it works, only that is does. Experiments show
>> that e.g. doing a clflush(seqno) instead is not sufficient, but we can
>> remove t
