From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: Re: [RFC] Host1x/TegraDRM UAPI (sync points) Date: Mon, 29 Jun 2020 22:33:23 +0300 Message-ID: <8e78c18a-59da-a72f-e04a-ef6c23a49830@gmail.com> References: <9b06b7ec-f952-2561-7afb-5653514cd5d3@kapsi.fi> <5b1edaad-ba36-7b0f-5b02-457ae5b6d91e@gmail.com> <62859775-514c-2941-75ed-6905e9282a6f@kapsi.fi> <623c1eaa-31fb-8dff-f6c0-d8cd0be60070@gmail.com> <827c92a6-7fed-a81c-ba8e-6c69416c4ab9@kapsi.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <827c92a6-7fed-a81c-ba8e-6c69416c4ab9-/1wQRMveznE@public.gmane.org> Content-Language: en-US Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mikko Perttunen , Thierry Reding , Jon Hunter , David Airlie , Daniel Vetter , sumit.semwal-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, gustavo-THi1TnShQwVAfugRpC6u6w@public.gmane.org Cc: "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , dri-devel , talho-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, bhuntsman-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, Erik Faye-Lund List-Id: linux-tegra@vger.kernel.org 29.06.2020 13:27, Mikko Perttunen пишет: ... >>>> 3. Sync points should be properly refcounted. Job's sync points >>>> shouldn't be re-used while job is alive. >>>> >>>> 4. The job's sync point can't be re-used after job's submission (UAPI >>>> constraint!). Userspace must free sync point and allocate a new one for >>>> the next job submission. And now we: >>>> >>>>     - Know that job's sync point is always in a healthy state! >>>> >>>>     - We're not limited by a number of physically available hardware >>>> sync >>>> points! Allocation should block until free sync point is available. It also occurred to me that if allocation is blocking and if there is a need to allocate multiple sync points for a job, then the IOCTL should be able to allocate multiple sync points at once. This will prevent interlock situation where two context could block on each other. 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[79.139.237.54]) by smtp.googlemail.com with ESMTPSA id w4sm156488ljw.16.2020.06.29.12.33.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 29 Jun 2020 12:33:24 -0700 (PDT) Subject: Re: [RFC] Host1x/TegraDRM UAPI (sync points) To: Mikko Perttunen , Thierry Reding , Jon Hunter , David Airlie , Daniel Vetter , sumit.semwal@linaro.org, gustavo@padovan.org References: <9b06b7ec-f952-2561-7afb-5653514cd5d3@kapsi.fi> <5b1edaad-ba36-7b0f-5b02-457ae5b6d91e@gmail.com> <62859775-514c-2941-75ed-6905e9282a6f@kapsi.fi> <623c1eaa-31fb-8dff-f6c0-d8cd0be60070@gmail.com> <827c92a6-7fed-a81c-ba8e-6c69416c4ab9@kapsi.fi> From: Dmitry Osipenko Message-ID: <8e78c18a-59da-a72f-e04a-ef6c23a49830@gmail.com> Date: Mon, 29 Jun 2020 22:33:23 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <827c92a6-7fed-a81c-ba8e-6c69416c4ab9@kapsi.fi> Content-Language: en-US X-Mailman-Approved-At: Tue, 30 Jun 2020 07:34:54 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-tegra@vger.kernel.org" , talho@nvidia.com, bhuntsman@nvidia.com, dri-devel , Erik Faye-Lund Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" MjkuMDYuMjAyMCAxMzoyNywgTWlra28gUGVydHR1bmVuINC/0LjRiNC10YI6Ci4uLgo+Pj4+IDMu IFN5bmMgcG9pbnRzIHNob3VsZCBiZSBwcm9wZXJseSByZWZjb3VudGVkLiBKb2IncyBzeW5jIHBv aW50cwo+Pj4+IHNob3VsZG4ndCBiZSByZS11c2VkIHdoaWxlIGpvYiBpcyBhbGl2ZS4KPj4+Pgo+ Pj4+IDQuIFRoZSBqb2IncyBzeW5jIHBvaW50IGNhbid0IGJlIHJlLXVzZWQgYWZ0ZXIgam9iJ3Mg c3VibWlzc2lvbiAoVUFQSQo+Pj4+IGNvbnN0cmFpbnQhKS4gVXNlcnNwYWNlIG11c3QgZnJlZSBz eW5jIHBvaW50IGFuZCBhbGxvY2F0ZSBhIG5ldyBvbmUgZm9yCj4+Pj4gdGhlIG5leHQgam9iIHN1 Ym1pc3Npb24uIEFuZCBub3cgd2U6Cj4+Pj4KPj4+PiDCoMKgwqAgLSBLbm93IHRoYXQgam9iJ3Mg c3luYyBwb2ludCBpcyBhbHdheXMgaW4gYSBoZWFsdGh5IHN0YXRlIQo+Pj4+Cj4+Pj4gwqDCoMKg IC0gV2UncmUgbm90IGxpbWl0ZWQgYnkgYSBudW1iZXIgb2YgcGh5c2ljYWxseSBhdmFpbGFibGUg aGFyZHdhcmUKPj4+PiBzeW5jCj4+Pj4gcG9pbnRzISBBbGxvY2F0aW9uIHNob3VsZCBibG9jayB1 bnRpbCBmcmVlIHN5bmMgcG9pbnQgaXMgYXZhaWxhYmxlLgoKSXQgYWxzbyBvY2N1cnJlZCB0byBt ZSB0aGF0IGlmIGFsbG9jYXRpb24gaXMgYmxvY2tpbmcgYW5kIGlmIHRoZXJlIGlzIGEKbmVlZCB0 byBhbGxvY2F0ZSBtdWx0aXBsZSBzeW5jIHBvaW50cyBmb3IgYSBqb2IsIHRoZW4gdGhlIElPQ1RM IHNob3VsZApiZSBhYmxlIHRvIGFsbG9jYXRlIG11bHRpcGxlIHN5bmMgcG9pbnRzIGF0IG9uY2Uu IFRoaXMgd2lsbCBwcmV2ZW50CmludGVybG9jayBzaXR1YXRpb24gd2hlcmUgdHdvIGNvbnRleHQg Y291bGQgYmxvY2sgb24gZWFjaCBvdGhlci4KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMu ZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlz dGluZm8vZHJpLWRldmVsCg==