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Hello Danilo Krummrich, Commit bf32a3a12686 ("drm/nouveau: use GEM references instead of TTMs") from Jul 18, 2024 (linux-next), leads to the following Smatch static checker warning: drivers/gpu/drm/nouveau/dispnv50/disp.c:2818 nv50_display_destroy() error: we previously assumed 'disp->sync' could be null (see line 2816) drivers/gpu/drm/nouveau/dispnv50/disp.c 2804 st...

Am 09.01.24 um 09:14 schrieb Thomas Hellstr?m: > Hi, Christian > > On Tue, 2024-01-09 at 08:47 +0100, Christian K?nig wrote: >> Hi guys, >> >> I'm trying to make this functionality a bit more useful for years now >> since we multiple reports that behavior of drivers can be suboptimal >> when multiple placements be given. >> >> So basically

On 9 July 2014 22:29, Maarten Lankhorst <maarten.lankhorst at canonical.com> wrote: > Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com> > --- > drivers/gpu/drm/radeon/radeon.h | 15 +- > drivers/gpu/drm/radeon/radeon_device.c | 60 ++++++++- > drivers/gpu/drm/radeon/radeon_fence.c | 223 ++++++++++++++++++++++++++------ > 3 files

...istian. > > - Danilo > >> >>> >>> - Danilo >>> >>> Danilo Krummrich (3): >>> ?? drm/nouveau: prime: fix refcount underflow >>> ?? drm/nouveau: bo: remove unused functions >>> ?? drm/nouveau: use GEM references instead of TTMs >>> >>> ? drivers/gpu/drm/nouveau/dispnv04/crtc.c | 43 +++++++++++++++------ >>> ? drivers/gpu/drm/nouveau/dispnv50/disp.c |? 4 +- >>> ? drivers/gpu/drm/nouveau/nouveau_bo.h??? | 50 >>> ++----------------------- >>> ? drivers/gpu/drm/nouveau/no...

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...r driver you can just ignore that part and do process based waits everywhere. > >I'm sure you have some ideas and I think you really need to > >investigate them to move this thing forward, > >even it if means some issues with android sync pts. > > Actually I think that TTMs fence interface already gave quite a good hint > how it might look like. I can only guess that this won't fit with the > Android stuff, otherwise I can't see a good reason why we didn't stick with > that. Well the current plan for i915<->radeon sync from Maarten is to us...

...ginning. Good to know that I'm not the only one thinking that this isn't such a good idea. > I'm sure you have some ideas and I think you really need to > investigate them to move this thing forward, > even it if means some issues with android sync pts. Actually I think that TTMs fence interface already gave quite a good hint how it might look like. I can only guess that this won't fit with the Android stuff, otherwise I can't see a good reason why we didn't stick with that. > but none of the two major drivers seem to want the interface as-is so > some...

...e CPU to the GPU and vice-versa. Thanks to the feedback received on the previous revisions I believe this code looks rather good now. I also have extensively tested it and could not see any buffer corruption issue anymore. There is still one point which is not completely satisfying in my opinion: TTMs for TTM-backed objects are allocated in nouveau_sgdma_create_ttm() and populated in nouveau_ttm_tt_populate(). Coherently-allocated buffers need to use the ttm_dma API instead of the pool-based TTM API, and whether an object is coherent or not is stored in its instance of nouveau_bo. The problem i...