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[109.252.192.57]) by smtp.googlemail.com with ESMTPSA id y9sm387492ljm.94.2021.01.14.00.36.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jan 2021 00:36:09 -0800 (PST) Subject: Re: [PATCH v5 15/21] drm/tegra: Add new UAPI to header 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> <20210111130019.3515669-16-mperttunen@nvidia.com> From: Dmitry Osipenko Message-ID: Date: Thu, 14 Jan 2021 11:36:07 +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: 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 13.01.2021 21:56, Mikko Perttunen пишет: > On 1/13/21 8:14 PM, Dmitry Osipenko wrote: >> 11.01.2021 16:00, Mikko Perttunen пишет: >>> +struct drm_tegra_submit_buf { >>> +    /** >>> +     * @mapping_id: [in] >>> +     * >>> +     * Identifier of the mapping to use in the submission. >>> +     */ >>> +    __u32 mapping_id; >> >> I'm now in process of trying out the UAPI using grate drivers and this >> becomes the first obstacle. >> >> Looks like this is not going to work well for older Tegra SoCs, in >> particular for T20, which has a small GART. >> >> Given that the usefulness of the partial mapping feature is very >> questionable until it will be proven with a real userspace, we should >> start with a dynamic mappings that are done at a time of job submission. >> >> DRM already should have everything necessary for creating and managing >> caches of mappings, grate kernel driver has been using drm_mm_scan for a >> long time now for that. >> >> It should be fine to support the static mapping feature, but it should >> be done separately with the drm_mm integration, IMO. >> >> What do think? >> > > Can you elaborate on the requirements to be able to use GART? Are there > any other reasons this would not work on older chips? We have all DRM devices in a single address space on T30+, hence having duplicated mappings for each device should be a bit wasteful. > I think we should keep CHANNEL_MAP and mapping_ids, but if e.g. for GART > we cannot do mapping immediately at CHANNEL_MAP time, we can just treat > it as a "registration" call for the GEM object - potentially no-op like > direct physical addressing is. We can then do whatever is needed at > submit time. This way we can have the best of both worlds. I have some thoughts now, but nothing concrete yet. Maybe we will need to create a per-SoC ops for MM. I'll finish with trying what we currently have to see what else is missing and then we will decide what to do about it. > Note that partial mappings are already not present in this version of > the UAPI. Oh, right :) I haven't got closely to this part of reviewing yet. 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[109.252.192.57]) by smtp.googlemail.com with ESMTPSA id y9sm387492ljm.94.2021.01.14.00.36.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jan 2021 00:36:09 -0800 (PST) Subject: Re: [PATCH v5 15/21] drm/tegra: Add new UAPI to header 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> <20210111130019.3515669-16-mperttunen@nvidia.com> From: Dmitry Osipenko Message-ID: Date: Thu, 14 Jan 2021 11:36:07 +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: Content-Language: en-US X-Mailman-Approved-At: Thu, 14 Jan 2021 09:28:31 +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" MTMuMDEuMjAyMSAyMTo1NiwgTWlra28gUGVydHR1bmVuINC/0LjRiNC10YI6Cj4gT24gMS8xMy8y MSA4OjE0IFBNLCBEbWl0cnkgT3NpcGVua28gd3JvdGU6Cj4+IDExLjAxLjIwMjEgMTY6MDAsIE1p a2tvIFBlcnR0dW5lbiDQv9C40YjQtdGCOgo+Pj4gK3N0cnVjdCBkcm1fdGVncmFfc3VibWl0X2J1 ZiB7Cj4+PiArwqDCoMKgIC8qKgo+Pj4gK8KgwqDCoMKgICogQG1hcHBpbmdfaWQ6IFtpbl0KPj4+ ICvCoMKgwqDCoCAqCj4+PiArwqDCoMKgwqAgKiBJZGVudGlmaWVyIG9mIHRoZSBtYXBwaW5nIHRv IHVzZSBpbiB0aGUgc3VibWlzc2lvbi4KPj4+ICvCoMKgwqDCoCAqLwo+Pj4gK8KgwqDCoCBfX3Uz MiBtYXBwaW5nX2lkOwo+Pgo+PiBJJ20gbm93IGluIHByb2Nlc3Mgb2YgdHJ5aW5nIG91dCB0aGUg VUFQSSB1c2luZyBncmF0ZSBkcml2ZXJzIGFuZCB0aGlzCj4+IGJlY29tZXMgdGhlIGZpcnN0IG9i c3RhY2xlLgo+Pgo+PiBMb29rcyBsaWtlIHRoaXMgaXMgbm90IGdvaW5nIHRvIHdvcmsgd2VsbCBm b3Igb2xkZXIgVGVncmEgU29DcywgaW4KPj4gcGFydGljdWxhciBmb3IgVDIwLCB3aGljaCBoYXMg YSBzbWFsbCBHQVJULgo+Pgo+PiBHaXZlbiB0aGF0IHRoZSB1c2VmdWxuZXNzIG9mIHRoZSBwYXJ0 aWFsIG1hcHBpbmcgZmVhdHVyZSBpcyB2ZXJ5Cj4+IHF1ZXN0aW9uYWJsZSB1bnRpbCBpdCB3aWxs IGJlIHByb3ZlbiB3aXRoIGEgcmVhbCB1c2Vyc3BhY2UsIHdlIHNob3VsZAo+PiBzdGFydCB3aXRo IGEgZHluYW1pYyBtYXBwaW5ncyB0aGF0IGFyZSBkb25lIGF0IGEgdGltZSBvZiBqb2Igc3VibWlz c2lvbi4KPj4KPj4gRFJNIGFscmVhZHkgc2hvdWxkIGhhdmUgZXZlcnl0aGluZyBuZWNlc3Nhcnkg Zm9yIGNyZWF0aW5nIGFuZCBtYW5hZ2luZwo+PiBjYWNoZXMgb2YgbWFwcGluZ3MsIGdyYXRlIGtl cm5lbCBkcml2ZXIgaGFzIGJlZW4gdXNpbmcgZHJtX21tX3NjYW4gZm9yIGEKPj4gbG9uZyB0aW1l IG5vdyBmb3IgdGhhdC4KPj4KPj4gSXQgc2hvdWxkIGJlIGZpbmUgdG8gc3VwcG9ydCB0aGUgc3Rh dGljIG1hcHBpbmcgZmVhdHVyZSwgYnV0IGl0IHNob3VsZAo+PiBiZSBkb25lIHNlcGFyYXRlbHkg d2l0aCB0aGUgZHJtX21tIGludGVncmF0aW9uLCBJTU8uCj4+Cj4+IFdoYXQgZG8gdGhpbms/Cj4+ Cj4gCj4gQ2FuIHlvdSBlbGFib3JhdGUgb24gdGhlIHJlcXVpcmVtZW50cyB0byBiZSBhYmxlIHRv IHVzZSBHQVJUPyBBcmUgdGhlcmUKPiBhbnkgb3RoZXIgcmVhc29ucyB0aGlzIHdvdWxkIG5vdCB3 b3JrIG9uIG9sZGVyIGNoaXBzPwoKV2UgaGF2ZSBhbGwgRFJNIGRldmljZXMgaW4gYSBzaW5nbGUg YWRkcmVzcyBzcGFjZSBvbiBUMzArLCBoZW5jZSBoYXZpbmcKZHVwbGljYXRlZCBtYXBwaW5ncyBm b3IgZWFjaCBkZXZpY2Ugc2hvdWxkIGJlIGEgYml0IHdhc3RlZnVsLgoKPiBJIHRoaW5rIHdlIHNo b3VsZCBrZWVwIENIQU5ORUxfTUFQIGFuZCBtYXBwaW5nX2lkcywgYnV0IGlmIGUuZy4gZm9yIEdB UlQKPiB3ZSBjYW5ub3QgZG8gbWFwcGluZyBpbW1lZGlhdGVseSBhdCBDSEFOTkVMX01BUCB0aW1l LCB3ZSBjYW4ganVzdCB0cmVhdAo+IGl0IGFzIGEgInJlZ2lzdHJhdGlvbiIgY2FsbCBmb3IgdGhl IEdFTSBvYmplY3QgLSBwb3RlbnRpYWxseSBuby1vcCBsaWtlCj4gZGlyZWN0IHBoeXNpY2FsIGFk ZHJlc3NpbmcgaXMuIFdlIGNhbiB0aGVuIGRvIHdoYXRldmVyIGlzIG5lZWRlZCBhdAo+IHN1Ym1p dCB0aW1lLiBUaGlzIHdheSB3ZSBjYW4gaGF2ZSB0aGUgYmVzdCBvZiBib3RoIHdvcmxkcy4KCkkg aGF2ZSBzb21lIHRob3VnaHRzIG5vdywgYnV0IG5vdGhpbmcgY29uY3JldGUgeWV0LiBNYXliZSB3 ZSB3aWxsIG5lZWQKdG8gY3JlYXRlIGEgcGVyLVNvQyBvcHMgZm9yIE1NLgoKSSdsbCBmaW5pc2gg d2l0aCB0cnlpbmcgd2hhdCB3ZSBjdXJyZW50bHkgaGF2ZSB0byBzZWUgd2hhdCBlbHNlIGlzCm1p c3NpbmcgYW5kIHRoZW4gd2Ugd2lsbCBkZWNpZGUgd2hhdCB0byBkbyBhYm91dCBpdC4KCj4gTm90 ZSB0aGF0IHBhcnRpYWwgbWFwcGluZ3MgYXJlIGFscmVhZHkgbm90IHByZXNlbnQgaW4gdGhpcyB2 ZXJzaW9uIG9mCj4gdGhlIFVBUEkuCgpPaCwgcmlnaHQgOikgSSBoYXZlbid0IGdvdCBjbG9zZWx5 IHRvIHRoaXMgcGFydCBvZiByZXZpZXdpbmcgeWV0LgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBs aXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1h bi9saXN0aW5mby9kcmktZGV2ZWwK