Re: [Intel-gfx] [PATCH 2/4] drm/i915/gt: Wait for CSB entries on Tigerlake

2020-09-16 Thread Greg KH
On Wed, Sep 16, 2020 at 09:26:58AM +0100, Chris Wilson wrote: > Quoting Greg KH (2020-09-16 07:33:58) > > On Tue, Sep 15, 2020 at 01:41:48PM +0100, Chris Wilson wrote: > > > On Tigerlake, we are seeing a repeat of commit d8f505311717 > > > ("drm/i915/icl: > > > Forcibly evict stale csb entries") w

Re: [Intel-gfx] [PATCH 2/4] drm/i915/gt: Wait for CSB entries on Tigerlake

2020-09-16 Thread Chris Wilson
Quoting Greg KH (2020-09-16 07:33:58) > On Tue, Sep 15, 2020 at 01:41:48PM +0100, Chris Wilson wrote: > > On Tigerlake, we are seeing a repeat of commit d8f505311717 ("drm/i915/icl: > > Forcibly evict stale csb entries") where, presumably, due to a missing > > Global Observation Point synchronisati

Re: [Intel-gfx] [PATCH 2/4] drm/i915/gt: Wait for CSB entries on Tigerlake

2020-09-15 Thread Greg KH
On Tue, Sep 15, 2020 at 01:41:48PM +0100, Chris Wilson wrote: > On Tigerlake, we are seeing a repeat of commit d8f505311717 ("drm/i915/icl: > Forcibly evict stale csb entries") where, presumably, due to a missing > Global Observation Point synchronisation, the write pointer of the CSB > ringbuffer

Re: [Intel-gfx] [PATCH 2/4] drm/i915/gt: Wait for CSB entries on Tigerlake

2020-09-15 Thread Mika Kuoppala
Chris Wilson writes: > On Tigerlake, we are seeing a repeat of commit d8f505311717 ("drm/i915/icl: > Forcibly evict stale csb entries") where, presumably, due to a missing > Global Observation Point synchronisation, the write pointer of the CSB > ringbuffer is updated _prior_ to the contents of t

[Intel-gfx] [PATCH 2/4] drm/i915/gt: Wait for CSB entries on Tigerlake

2020-09-15 Thread Chris Wilson
On Tigerlake, we are seeing a repeat of commit d8f505311717 ("drm/i915/icl: Forcibly evict stale csb entries") where, presumably, due to a missing Global Observation Point synchronisation, the write pointer of the CSB ringbuffer is updated _prior_ to the contents of the ringbuffer. That is we see t