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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Tue, 21 Jul 2020 at 18:47, Thomas Hellstr=C3=B6m (Intel) wrote: > > > On 7/21/20 9:45 AM, Christian K=C3=B6nig wrote: > > Am 21.07.20 um 09:41 schrieb Daniel Vetter: > >> On Mon, Jul 20, 2020 at 01:15:17PM +0200, Thomas Hellstr=C3=B6m (Intel= ) > >> wrote: > >>> Hi, > >>> > >>> On 7/9/20 2:33 PM, Daniel Vetter wrote: > >>>> Comes up every few years, gets somewhat tedious to discuss, let's > >>>> write this down once and for all. > >>>> > >>>> What I'm not sure about is whether the text should be more explicit = in > >>>> flat out mandating the amdkfd eviction fences for long running compu= te > >>>> workloads or workloads where userspace fencing is allowed. > >>> Although (in my humble opinion) it might be possible to completely > >>> untangle > >>> kernel-introduced fences for resource management and dma-fences used > >>> for > >>> completion- and dependency tracking and lift a lot of restrictions > >>> for the > >>> dma-fences, including prohibiting infinite ones, I think this makes > >>> sense > >>> describing the current state. > >> Yeah I think a future patch needs to type up how we want to make that > >> happen (for some cross driver consistency) and what needs to be > >> considered. Some of the necessary parts are already there (with like t= he > >> preemption fences amdkfd has as an example), but I think some clear do= cs > >> on what's required from both hw, drivers and userspace would be really > >> good. > > > > I'm currently writing that up, but probably still need a few days for > > this. > > Great! I put down some (very) initial thoughts a couple of weeks ago > building on eviction fences for various hardware complexity levels here: > > https://gitlab.freedesktop.org/thomash/docs/-/blob/master/Untangling%20dm= a-fence%20and%20memory%20allocation.odt We are seeing HW that has recoverable GPU page faults but only for compute tasks, and scheduler without semaphores hw for graphics. So a single driver may have to expose both models to userspace and also introduces the problem of how to interoperate between the two models on one card. Dave. 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Tue, 21 Jul 2020 15:46:04 -0700 (PDT) MIME-Version: 1.0 References: <20200707201229.472834-4-daniel.vetter@ffwll.ch> <20200709123339.547390-1-daniel.vetter@ffwll.ch> <93b673b7-bb48-96eb-dc2c-bd4f9304000e@shipmail.org> <20200721074157.GB3278063@phenom.ffwll.local> <3603bb71-318b-eb53-0532-9daab62dce86@amd.com> <57a5eb9d-b74f-8ce4-7199-94e911d9b68b@shipmail.org> In-Reply-To: <57a5eb9d-b74f-8ce4-7199-94e911d9b68b@shipmail.org> From: Dave Airlie Date: Wed, 22 Jul 2020 08:45:53 +1000 Message-ID: To: =?UTF-8?Q?Thomas_Hellstr=C3=B6m_=28Intel=29?= Subject: Re: [Intel-gfx] [Linaro-mm-sig] [PATCH 1/2] dma-buf.rst: Document why indefinite fences are a bad idea X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Felix Kuehling , Daniel Stone , linux-rdma , Daniel Vetter , Intel Graphics Development , DRI Development , "moderated list:DMA BUFFER SHARING FRAMEWORK" , Steve Pronovost , amd-gfx mailing list , Jesse Natalie , Daniel Vetter , Thomas Hellstrom , Linux Media Mailing List , =?UTF-8?Q?Christian_K=C3=B6nig?= , Mika Kuoppala Content-Type: text/plain; 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Tue, 21 Jul 2020 15:46:04 -0700 (PDT) MIME-Version: 1.0 References: <20200707201229.472834-4-daniel.vetter@ffwll.ch> <20200709123339.547390-1-daniel.vetter@ffwll.ch> <93b673b7-bb48-96eb-dc2c-bd4f9304000e@shipmail.org> <20200721074157.GB3278063@phenom.ffwll.local> <3603bb71-318b-eb53-0532-9daab62dce86@amd.com> <57a5eb9d-b74f-8ce4-7199-94e911d9b68b@shipmail.org> In-Reply-To: <57a5eb9d-b74f-8ce4-7199-94e911d9b68b@shipmail.org> From: Dave Airlie Date: Wed, 22 Jul 2020 08:45:53 +1000 Message-ID: Subject: Re: [Linaro-mm-sig] [PATCH 1/2] dma-buf.rst: Document why indefinite fences are a bad idea To: =?UTF-8?Q?Thomas_Hellstr=C3=B6m_=28Intel=29?= X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Felix Kuehling , Daniel Stone , linux-rdma , Daniel Vetter , Intel Graphics Development , Maarten Lankhorst , DRI Development , "moderated list:DMA BUFFER SHARING FRAMEWORK" , Steve Pronovost , amd-gfx mailing list , Daniel Vetter , Jesse Natalie , Daniel Vetter , Thomas Hellstrom , Linux Media Mailing List , =?UTF-8?Q?Christian_K=C3=B6nig?= , Jason Ekstrand , Mika Kuoppala Content-Type: text/plain; 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