From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksandr Andrushchenko Subject: Re: [RfC PATCH] Add udmabuf misc device Date: Fri, 6 Apr 2018 12:34:45 +0300 Message-ID: <0351cf53-3e27-d0b4-a77b-8392c2b0a951@gmail.com> References: <20180313154826.20436-1-kraxel@redhat.com> <20180313161035.GL4788@phenom.ffwll.local> <20180314080301.366zycak3whqvvqx@sirius.home.kraxel.org> <20180406001117.GD31612@mdroper-desk.amr.corp.intel.com> <2411d2c1-33c0-2ba5-67ea-3bb9af5d5ec9@epam.com> <20180406090747.gwiegu22z4noj23i@sirius.home.kraxel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mail-wm0-x243.google.com (mail-wm0-x243.google.com [IPv6:2a00:1450:400c:c09::243]) by gabe.freedesktop.org (Postfix) with ESMTPS id E1B166E0A1 for ; Fri, 6 Apr 2018 09:34:48 +0000 (UTC) Received: by mail-wm0-x243.google.com with SMTP id x82so1998599wmg.1 for ; Fri, 06 Apr 2018 02:34:48 -0700 (PDT) In-Reply-To: <20180406090747.gwiegu22z4noj23i@sirius.home.kraxel.org> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Gerd Hoffmann , Oleksandr Andrushchenko Cc: Dongwon Kim , Tomeu Vizoso , David Airlie , qemu-devel@nongnu.org, dri-devel , open list , "moderated list:DMA BUFFER SHARING FRAMEWORK" , "open list:DMA BUFFER SHARING FRAMEWORK" List-Id: dri-devel@lists.freedesktop.org T24gMDQvMDYvMjAxOCAxMjowNyBQTSwgR2VyZCBIb2ZmbWFubiB3cm90ZToKPiAgICBIaSwKPgo+ Pj4gICAgKiBUaGUgZ2VuZXJhbCBpbnRlcmZhY2Ugc2hvdWxkIGJlIGFibGUgdG8gZXhwcmVzcyBz aGFyaW5nIGZyb20gYW55Cj4+PiAgICAgIGd1ZXN0Omd1ZXN0LCBub3QganVzdCBndWVzdDpob3N0 LiAgQXJiaXRyYXJ5IEc6RyBzaGFyaW5nIG1pZ2h0IGJlCj4+PiAgICAgIHNvbWV0aGluZyBzb21l IGh5cGVydmlzb3JzIHNpbXBseSBhcmVuJ3QgYWJsZSB0byBzdXBwb3J0LCBidXQgdGhlCj4+PiAg ICAgIHVzZXJzcGFjZSBBUEkgaXRzZWxmIHNob3VsZG4ndCBtYWtlIGFzc3VtcHRpb25zIG9yIHJl c3RyaWN0IHRoYXQuICBJCj4+PiAgICAgIHRoaW5rIGlkZWFsbHkgdGhlIHNoYXJpbmcgQVBJIHdv dWxkIGluY2x1ZGUgc29tZSBraW5kIG9mCj4+PiAgICAgIHF1ZXJ5X3RhcmdldHMgaW50ZXJmYWNl IHRoYXQgd291bGQgcmV0dXJuIGEgbGlzdCBvZiBWTSdzIHRoYXQgeW91cgo+Pj4gICAgICBjdXJy ZW50IE9TIGlzIGFsbG93ZWQgdG8gc2hhcmUgd2l0aDsgdGhhdCBsaXN0IHdvdWxkIGJlIGRlcGVu ZCBvbiB0aGUKPj4+ICAgICAgcG9saWN5IGVzdGFibGlzaGVkIGJ5IHRoZSBzeXN0ZW0gaW50ZWdy YXRvciwgYnV0IG9idmlvdXNseSB3b3VsZG4ndAo+Pj4gICAgICBpbmNsdWRlIHRhcmdldHMgdGhh dCB0aGUgaHlwZXJ2aXNvciBpdHNlbGYgd291bGRuJ3QgYmUgY2FwYWJsZSBvZgo+Pj4gICAgICBo YW5kbGluZy4KPj4gQ2FuIHlvdSBnaXZlIGEgdXNlLWNhc2UgZm9yIHRoaXM/IEkgbWVhbiB0aGF0 IHRoZSBzeXN0ZW0gaW50ZWdyYXRvcgo+PiBpcyB0aGUgb25lIHdobyBkZWZpbmVzIHdoaWNoIGd1 ZXN0cy9ob3N0cyB0YWxrIHRvIGVhY2ggb3RoZXIsCj4+IGJ1dCBxdWVyeWluZyBtZWFucyB0aGF0 IGl0IGlzIHBvc3NpYmxlIHRoYXQgVk1zIGhhdmUgc29tZSBzb3J0Cj4+IG9mIGRpc2NvdmVyeSBt ZWNoYW5pc20sIHNvIHRoZXkgY2FuIGRlY2lkZSBvbiB0aGVpciBvd24gd2hvbQo+PiB0byBjb25u ZWN0IHRvLgo+IE5vdGUgdGhhdCB2c29jayAoY3JlYXRlZCBieSB2bXdhcmUsIHRoZXNlIGRheXMg YWxzbyBoYXMgYSB2aXJ0aW8KPiB0cmFuc3BvcnQgZm9yIGt2bSkgc3RhcnRlZCB3aXRoIHN1cHBv cnQgZm9yIGJvdGggZ3Vlc3QgPD0+IGhvc3QgYW5kCj4gZ3Vlc3QgPD0+IGd1ZXN0IHN1cHBvcnQu ICBCdXQgbGF0ZXIgb24gZ3Vlc3QgPD0+IGd1ZXN0IHdhcyBkcm9wcGVkLgo+IEFzIGZhciBJIGtu b3cgdGhlIHJlYXNvbnMgd2hlcmUgKGEpIGxhY2sgb2YgdXNlIGNhc2VzIGFuZCAoYikgc2VjdXJp dHkuCj4KPiBTbywgSSBsaWtld2lzZSB3b3VsZCBrbm93IG1vcmUgZGV0YWlscyBvbiB0aGUgdXNl IGNhc2VzIHlvdSBoYXZlIGluIG1pbmQKPiBoZXJlLiAgVW5sZXNzIHdlIGhhdmUgYSBjb21wZWxs aW5nIHVzZSBjYXNlIGhlcmUgSSdkIHN1Z2dlc3QgdG8gZHJvcCB0aGUKPiBndWVzdCA8PT4gZ3Vl c3QgcmVxdWlyZW1lbnQgYXMgaXQgbWFrZXMgdGhlIHdob2xlIHRoaW5nIGFsb3QgbW9yZQo+IGNv bXBsZXguClRoaXMgaXMgZXhhY3RseSB0aGUgdXNlLWNhc2Ugd2UgaGF2ZTogaW4gb3VyIHNldHVw IERvbTAgZG9lc24ndApvd24gYW55IEhXIGF0IGFsbCBhbmQgYWxsIHRoZSBIVyBpcyBwYXNzZWQg aW50byBhIGRlZGljYXRlZApkcml2ZXIgZG9tYWluIChEb21EKSB3aGljaCBpcyBzdGlsbCBhIGd1 ZXN0IGRvbWFpbi4KVGhlbiwgYnVmZmVycyBhcmUgc2hhcmVkIGJldHdlZW4gdHdvIGd1ZXN0cywg Zm9yIGV4YW1wbGUsCkRvbUQgYW5kIERvbUEgKEFuZHJvaWQgZ3Vlc3QpCj4+PiAgICAqIFRoZSBz aGFyaW5nIEFQSSBjb3VsZCBiZSB1c2VkIHRvIHNoYXJlIG11bHRpcGxlIGtpbmRzIG9mIGNvbnRl bnQgaW4gYQo+Pj4gICAgICBzaW5nbGUgc3lzdGVtLiAgVGhlIHNoYXJpbmcgc2luayBkcml2ZXIg cnVubmluZyBpbiB0aGUgY29udGVudAo+Pj4gICAgICBwcm9kdWNlcidzIFZNIHNob3VsZCBhY2Nl cHQgc29tZSBhZGRpdGlvbmFsIG1ldGFkYXRhIHRoYXQgd2lsbCBiZQo+Pj4gICAgICBwYXNzZWQg b3ZlciB0byB0aGUgdGFyZ2V0IFZNIGFzIHdlbGwuCj4gTm90IHN1cmUgdGhpcyBzaG91bGQgYmUg cGFydCBvZiBoeXBlci1kbWFidWYuICBBIGRtYS1idWYgaXMgbm90aGluZyBidXQKPiBhIGJsb2Nr IG9mIGRhdGEsIHBlcmlvZC4gIFRoZXJlZm9yZSBwcm90b2NvbHMgd2l0aCBkbWEtYnVmIHN1cHBv cnQKPiAod2F5bGFuZCBmb3IgZXhhbXBsZSkgdHlwaWNhbGx5IGFscmVhZHkgc2VuZCBvdmVyIG1l dGFkYXRhIGRlc2NyaWJpbmcKPiB0aGUgY29udGVudCwgc28gZHVwbGljYXRpbmcgdGhhdCBpbiBo eXBlci1kbWFidWYgbG9va3MgcG9pbnRsZXNzLgo+Cj4+IDEuIFdlIGFyZSB0YXJnZXRpbmcgQVJN IGFuZCBvbmUgb2YgdGhlIG1ham9yIHJlcXVpcmVtZW50cyBmb3IgdGhlIGJ1ZmZlcgo+PiBzaGFy aW5nIGlzIHRoZSBhYmlsaXR5IHRvIGFsbG9jYXRlIHBoeXNpY2FsbHkgY29udGlndW91cyBidWZm ZXJzLCB3aGljaCBnZXRzCj4+IGV2ZW4gbW9yZSBjb21wbGljYXRlZCBmb3Igc3lzdGVtcyBub3Qg YmFja2VkIHdpdGggYW4gSU9NTVUuIFNvLCBmb3Igc29tZQo+PiB1c2UtY2FzZXMgaXQgaXMgZW5v dWdoIHRvIG1ha2UgdGhlIGJ1ZmZlcnMgY29udGlndW91cyBpbiB0ZXJtcyBvZiBJUEEgYW5kCj4+ IHNvbWV0aW1lcyB0aG9zZSBuZWVkIHRvIGJlIGNvbnRpZ3VvdXMgaW4gdGVybXMgb2YgUEEuCj4g V2hpY2ggcHJldHR5IG11Y2ggaW1wbGllcyB0aGUgaG9zdCBtdXN0IHRvIHRoZSBhbGxvY2F0aW9u Lgo+Cj4+IDIuIEZvciBYZW4gd2Ugd291bGQgbG92ZSB0byBzZWUgVUFQSSB0byBjcmVhdGUgYSBk bWEtYnVmIGZyb20gZ3JhbnQKPj4gcmVmZXJlbmNlcyBwcm92aWRlZCwgc28gd2UgY2FuIHVzZSB0 aGlzIGdlbmVyaWMgc29sdXRpb24gdG8gaW1wbGVtZW50Cj4+IHplcm8tY29weWluZyB3aXRob3V0 IGJyZWFraW5nIHRoZSBleGlzdGluZyBYZW4gcHJvdG9jb2xzLiBUaGlzIGNhbgo+PiBwcm9iYWJs eSBiZSBleHRlbmRlZCB0byBvdGhlciBoeXBlcnZpem9ycyBhcyB3ZWxsLgo+IEknbSBub3Qgc3Vy ZSB3ZSBjYW4gY3JlYXRlIHNvbWV0aGluZyB3aGljaCB3b3JrcyBvbiBib3RoIGt2bSBhbmQgeGVu Lgo+IFRoZSBtZW1vcnkgbWFuYWdlbWVudCBtb2RlbCBpcyBxdWl0ZSBkaWZmZXJlbnQgLi4uCj4K Pgo+IE9uIHhlbiB0aGUgaHlwZXJ2aXNvciBtYW5hZ2VzIGFsbCBtZW1vcnkuICBHdWVzdHMgY2Fu IGFsbG93IG90aGVyIGd1ZXN0cwo+IHRvIGFjY2VzcyBzcGVjaWZpYyBwYWdlcyAodXNpbmcgZ3Jh bnQgdGFibGVzKS4gIEluIHRoZW9yeSBhbnkgZ3Vlc3QgPD0+Cj4gZ3Vlc3QgY29tbXVuaWNhdGlv biBpcyBwb3NzaWJsZS4gIEluIHByYWN0aWNlIGlzIG1vc3RseSBndWVzdCA8PT4gZG9tMAo+IGJl Y2F1c2UgZ3Vlc3RzIGFjY2VzcyB0aGVpciB2aXJ0dWFsIGhhcmR3YXJlIHRoYXQgd2F5LiAgZG9t MCBpcyB0aGUKPiBwcml2aWxlZGdlZCBndWVzdCB3aGljaCBvd25zIGFueSBoYXJkd2FyZSBub3Qg bWFuYWdlZCBieSB4ZW4gaXRzZWxmLgpQbGVhc2Ugc2VlIGFib3ZlIGZvciBvdXIgc2V0dXAgd2l0 aCBEb21EIGFuZCBEb20wIGJlaW5nCmEgZ2VuZXJpYyBBUk12OCBkb21haW4sIG5vIEhXCj4gWGVu IGd1ZXN0cyBjYW4gYXNrIHRoZSBoeXBlcnZpc29yIHRvIHVwZGF0ZSB0aGUgbWFwcGluZyBvZiBn dWVzdAo+IHBoeXNpY2FsIHBhZ2VzLiAgVGhleSBjYW4gYmFsbG9uIGRvd24gKHVubWFwIGFuZCBm cmVlIHBhZ2VzKS4gIFRoZXkgY2FuCj4gYmFsbG9uIHVwIChhc2sgdGhlIGh5cGVydmlzb3IgdG8g bWFwIGZyZXNoIHBhZ2VzKS4gIFRoZXkgY2FuIG1hcCBwYWdlcwo+IGV4cG9ydGVkIGJ5IG90aGVy IGd1ZXN0cyB1c2luZyBncmFudCB0YWJsZXMuICB4ZW4temNvcHkgbWFrZXMgaGVhdnkgdXNlCj4g b2YgdGhpcy4gIEl0IGJhbGxvb25zIGRvd24sIHRvIG1ha2Ugcm9vbSBpbiB0aGUgZ3Vlc3QgcGh5 c2ljYWwgYWRkcmVzcwo+IHNwYWNlLCB0aGVuIGdvZXMgbWFwIHRoZSBleHBvcnRlZCBwYWdlcyB0 aGVyZSwgZmluYWxseSBjb21wb3NlcyBhCj4gZG1hLWJ1Zi4KVGhpcyBpcyB3aGF0IGl0IGRvZXMK Pgo+IE9uIGt2bSBxZW11IG1hbmFnZXMgYWxsIGd1ZXN0IG1lbW9yeS4gIHFlbXUgYWxzbyBoYXMg YWxsIGd1ZXN0IG1lbW9yeQo+IG1hcHBlZCwgc28gYSBncmFudC10YWJsZSBsaWtlIG1lY2hhbmlz bSBpc24ndCBuZWVkZWQgdG8gaW1wbGVtZW50Cj4gdmlydHVhbCBkZXZpY2VzLiAgcWVtdSBjYW4g ZGVjaWRlIGhvdyBpdCBiYWNrcyBtZW1vcnkgZm9yIHRoZSBndWVzdC4KPiBxZW11IHByb3BhZ2F0 ZXMgdGhlIGd1ZXN0IG1lbW9yeSBtYXAgdG8gdGhlIGt2bSBkcml2ZXIgaW4gdGhlIGxpbnV4Cj4g a2VybmVsLiAga3ZtIGd1ZXN0cyBoYXZlIHNvbWUgY29udHJvbCBvdmVyIHRoZSBndWVzdCBtZW1v cnkgbWFwLCBmb3IKPiBleGFtcGxlIHRoZXkgY2FuIG1hcCBwY2kgYmFycyB3aGVyZXZlciB0aGV5 IHdhbnQgaW4gdGhlaXIgZ3Vlc3QgcGh5c2ljYWwKPiBhZGRyZXNzIHNwYWNlIGJ5IHByb2dyYW1t aW5nIHRoZSBiYXNlIHJlZ2lzdGVycyBhY2NvcmRpbmdseSwgYnV0IHVubGlrZQo+IHhlbiBndWVz dHMgdGhleSBjYW4ndCBhc2sgdGhlIGhvc3QgdG8gcmVtYXAgaW5kaXZpZHVhbCBwYWdlcy4KPgo+ IER1ZSB0byBxZW11IGhhdmluZyBhbGwgZ3Vlc3QgbWVtb3J5IG1hcHBlZCB2aXJ0dWFsIGRldmlj ZXMgYXJlIHR5cGljYWxseQo+IGRlc2lnbmVkIHRvIGhhdmUgdGhlIGd1ZXN0IGFsbG9jYXRlIHJl c291cmNlcywgdGhlbiBub3RpZnkgdGhlIGhvc3QKPiB3aGVyZSB0aGV5IGFyZSBsb2NhdGVkLiAg VGhpcyBpcyB3aGVyZSB0aGUgdWRtYWJ1ZiBpZGVhIGNvbWVzIGZyb206Cj4gR3Vlc3QgdGVsbHMg dGhlIGhvc3QgKHFlbXUpIHdoZXJlIHRoZSBnZW0gb2JqZWN0IGlzLCBhbmQgcWVtdSB0aGVuIGNh bgo+IGNyZWF0ZSBhIGRtYWJ1ZiBiYWNrZWQgYnkgdGhvc2UgcGFnZXMgdG8gcGFzcyBpdCBvbiB0 byBvdGhlciBwcm9jZXNzZXMKPiBzdWNoIGFzIHRoZSB3YXlsYW5kIGRpc3BsYXkgc2VydmVyLiAg UG9zc2libHkgZXZlbiB3aXRob3V0IHRoZSBndWVzdAo+IGV4cGxpY2l0bHkgYXNraW5nIGZvciBp dCwgaS5lLiBleHBvcnQgdGhlIGZyYW1lYnVmZmVyIHBsYWNlZCBieSB0aGUKPiBndWVzdCBpbiB0 aGUgKHZpcnR1YWwpIHZnYSBwY2kgbWVtb3J5IGJhciBhcyBkbWEtYnVmLiAgQW5kIEkgY2FuIGlt YWdpbmUKPiB0aGF0IHRoaXMgaXMgdXNlZnVsIG91dHNpemUgdmlydHVhbGl6YXRpb24gdG9vLgo+ Cj4KPiBJIGZhaWwgdG8gc2VlIGFueSBjb21tb24gZ3JvdW5kIGZvciB4ZW4temNvcHkgYW5kIHVk bWFidWYgLi4uCj4KPiBCZXNpZGUgdGhhdCB0aGVyZSBpcyB0aGUgcHJvYmxlbSB0aGF0IHRoZSB1 ZG1hYnVmIGlkZWEgaGFzIGl0cyBvd24gc2hhcmUKPiBvZiBpc3N1ZXMsIGZvciBleGFtcGxlIHRo ZSBmb3JrKCkgaXNzdWUgcG9pbnRlZCBvdXQgYnkgQ2hyaXN0aWFuCj4gS8O2bmlnWzFdLiAgU28g SSBzdGlsbCBuZWVkIHRvIGZpbmQgc29tZXRoaW5nIHdoaWNoIGNhbiB3b3JrIGZvciBrdm0gLi4u Cj4KPiBjaGVlcnMsCj4gICAgR2VyZAo+Cj4gWzFdIGh0dHBzOi8vd3d3LnNwaW5pY3MubmV0L2xp c3RzL2RyaS1kZXZlbC9tc2cxNjk0NDIuaHRtbAo+IF9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCj4gZHJpLWRldmVsIG1haWxpbmcgbGlzdAo+IGRyaS1kZXZl bEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKPiBodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9t YWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMu ZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlz dGluZm8vZHJpLWRldmVsCg==