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([2a00:1370:814d:ea25:a10:76ff:fe69:21b6]) by smtp.googlemail.com with ESMTPSA id b18sm823875lfj.140.2021.01.27.13.26.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Jan 2021 13:26:54 -0800 (PST) Subject: Re: [PATCH v5 00/21] Host1x/TegraDRM UAPI To: Mikko Perttunen , Mikko Perttunen , thierry.reding@gmail.com, jonathanh@nvidia.com, airlied@linux.ie, daniel@ffwll.ch Cc: linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, talho@nvidia.com, bhuntsman@nvidia.com References: <20210111130019.3515669-1-mperttunen@nvidia.com> <2f999b6d-d781-503a-78f4-d444bce72c58@kapsi.fi> From: Dmitry Osipenko Message-ID: <638c1aeb-921b-0ea2-5258-16c6d3183306@gmail.com> Date: Thu, 28 Jan 2021 00:26:53 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <2f999b6d-d781-503a-78f4-d444bce72c58@kapsi.fi> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 26.01.2021 05:45, Mikko Perttunen пишет: >> 5. The hardware state of sync points should be reset when sync point is >> requested, not when host1x driver is initialized. > > This may be doable, but I don't think it is critical for this UAPI, so > let's consider it after this series. > > The userspace should anyway not be able to assume the initial value of > the syncpoint upon allocation. The kernel should set it to some high > value to catch any issues related to wraparound. This is critical because min != max when sync point is requested. > Also, this makes code more complicated since it now needs to ensure all > waits on the syncpoint have completed before freeing the syncpoint, > which can be nontrivial e.g. if the waiter is in a different virtual > machine or some other device connected via PCIe (a real usecase). It sounds to me that these VM sync points should be treated very separately from a generic sync points, don't you think so? Let's not mix them and get the generic sync points usable first. 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([2a00:1370:814d:ea25:a10:76ff:fe69:21b6]) by smtp.googlemail.com with ESMTPSA id b18sm823875lfj.140.2021.01.27.13.26.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Jan 2021 13:26:54 -0800 (PST) Subject: Re: [PATCH v5 00/21] Host1x/TegraDRM UAPI To: Mikko Perttunen , Mikko Perttunen , thierry.reding@gmail.com, jonathanh@nvidia.com, airlied@linux.ie, daniel@ffwll.ch References: <20210111130019.3515669-1-mperttunen@nvidia.com> <2f999b6d-d781-503a-78f4-d444bce72c58@kapsi.fi> From: Dmitry Osipenko Message-ID: <638c1aeb-921b-0ea2-5258-16c6d3183306@gmail.com> Date: Thu, 28 Jan 2021 00:26:53 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <2f999b6d-d781-503a-78f4-d444bce72c58@kapsi.fi> Content-Language: en-US X-Mailman-Approved-At: Thu, 28 Jan 2021 08:15:36 +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@lists.freedesktop.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" MjYuMDEuMjAyMSAwNTo0NSwgTWlra28gUGVydHR1bmVuINC/0LjRiNC10YI6Cj4+IDUuIFRoZSBo YXJkd2FyZSBzdGF0ZSBvZiBzeW5jIHBvaW50cyBzaG91bGQgYmUgcmVzZXQgd2hlbiBzeW5jIHBv aW50IGlzCj4+IHJlcXVlc3RlZCwgbm90IHdoZW4gaG9zdDF4IGRyaXZlciBpcyBpbml0aWFsaXpl ZC4KPiAKPiBUaGlzIG1heSBiZSBkb2FibGUsIGJ1dCBJIGRvbid0IHRoaW5rIGl0IGlzIGNyaXRp Y2FsIGZvciB0aGlzIFVBUEksIHNvCj4gbGV0J3MgY29uc2lkZXIgaXQgYWZ0ZXIgdGhpcyBzZXJp ZXMuCj4gCj4gVGhlIHVzZXJzcGFjZSBzaG91bGQgYW55d2F5IG5vdCBiZSBhYmxlIHRvIGFzc3Vt ZSB0aGUgaW5pdGlhbCB2YWx1ZSBvZgo+IHRoZSBzeW5jcG9pbnQgdXBvbiBhbGxvY2F0aW9uLiBU aGUga2VybmVsIHNob3VsZCBzZXQgaXQgdG8gc29tZSBoaWdoCj4gdmFsdWUgdG8gY2F0Y2ggYW55 IGlzc3VlcyByZWxhdGVkIHRvIHdyYXBhcm91bmQuCgpUaGlzIGlzIGNyaXRpY2FsIGJlY2F1c2Ug bWluICE9IG1heCB3aGVuIHN5bmMgcG9pbnQgaXMgcmVxdWVzdGVkLgoKPiBBbHNvLCB0aGlzIG1h a2VzIGNvZGUgbW9yZSBjb21wbGljYXRlZCBzaW5jZSBpdCBub3cgbmVlZHMgdG8gZW5zdXJlIGFs bAo+IHdhaXRzIG9uIHRoZSBzeW5jcG9pbnQgaGF2ZSBjb21wbGV0ZWQgYmVmb3JlIGZyZWVpbmcg dGhlIHN5bmNwb2ludCwKPiB3aGljaCBjYW4gYmUgbm9udHJpdmlhbCBlLmcuIGlmIHRoZSB3YWl0 ZXIgaXMgaW4gYSBkaWZmZXJlbnQgdmlydHVhbAo+IG1hY2hpbmUgb3Igc29tZSBvdGhlciBkZXZp Y2UgY29ubmVjdGVkIHZpYSBQQ0llIChhIHJlYWwgdXNlY2FzZSkuCgpJdCBzb3VuZHMgdG8gbWUg dGhhdCB0aGVzZSBWTSBzeW5jIHBvaW50cyBzaG91bGQgYmUgdHJlYXRlZCB2ZXJ5CnNlcGFyYXRl bHkgZnJvbSBhIGdlbmVyaWMgc3luYyBwb2ludHMsIGRvbid0IHlvdSB0aGluayBzbz8gTGV0J3Mg bm90IG1peAp0aGVtIGFuZCBnZXQgdGhlIGdlbmVyaWMgc3luYyBwb2ludHMgdXNhYmxlIGZpcnN0 LgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2 ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9s aXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK