From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Hellstrom Subject: Re: about mmap dma-buf and sync Date: Fri, 21 Aug 2015 07:25:07 +0200 Message-ID: <55D6B633.2070103@vmware.com> References: <55D50442.5080102@intel.com> <55D57837.4080301@vmware.com> <20150820145340.GA2309@gmail.com> <55D62CE0.5060904@shipmail.org> <20150820203437.GA3973@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from smtp-outbound-1.vmware.com (smtp-outbound-1.vmware.com [208.91.2.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id 267F36E149 for ; Thu, 20 Aug 2015 22:25:13 -0700 (PDT) In-Reply-To: <20150820203437.GA3973@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Jerome Glisse Cc: Thomas Hellstrom , "dri-devel@lists.freedesktop.org" List-Id: dri-devel@lists.freedesktop.org T24gMDgvMjAvMjAxNSAxMDozNCBQTSwgSmVyb21lIEdsaXNzZSB3cm90ZToKPiBPbiBUaHUsIEF1 ZyAyMCwgMjAxNSBhdCAwOTozOToxMlBNICswMjAwLCBUaG9tYXMgSGVsbHN0cm9tIHdyb3RlOgo+ PiBPbiAwOC8yMC8yMDE1IDA0OjUzIFBNLCBKZXJvbWUgR2xpc3NlIHdyb3RlOgo+Pj4gT24gVGh1 LCBBdWcgMjAsIDIwMTUgYXQgMDg6NDg6MjNBTSArMDIwMCwgVGhvbWFzIEhlbGxzdHJvbSB3cm90 ZToKPj4+PiBIaSwgVGlhZ28hCj4+Pj4KPj4+PiBPbiAwOC8yMC8yMDE1IDEyOjMzIEFNLCBUaWFn byBWaWduYXR0aSB3cm90ZToKPj4+Pj4gSGV5IFRob21hcywgeW91IGhhdmVuJ3QgYW5zd2VyZWQg bXkgZW1haWwgYWJvdXQgbWFraW5nIFNZTkNfKiBtYW5kYXRvcnk6Cj4+Pj4+Cj4+Pj4+IGh0dHA6 Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvYXJjaGl2ZXMvZHJpLWRldmVsLzIwMTUtQXVndXN0LzA4 ODM3Ni5odG1sCj4+Pj4gSG1tLCBmb3Igc29tZSByZWFzb24gaXQgZG9lc24ndCBzaG93IHVwIGlu IG15IG1haWwgYXBwLCBidXQgSSBmb3VuZCBpdAo+Pj4+IGluIHRoZSBhcmNoaXZlcy4gQW4gYXR0 ZW1wdCB0byBleHBsYWluIHRoZSBzaXR1YXRpb24gZnJvbSB0aGUgdm13Z2Z4Cj4+Pj4gcGVyc3Bl Y3RpdmUuCj4+Pj4KPj4+PiBUaGUgZmFjdCB0aGF0IHRoZSBpbnRlcmZhY2UgaXMgZ2VuZXJpYyBt ZWFucyB0aGF0IHBlb3BsZSB3aWxsIHN0YXJ0Cj4+Pj4gdXNpbmcgaXQgZm9yIHRoZSB6ZXJvLWNv cHkgY2FzZS4gVGhlcmUgaGFzIGJlZW4gYSBjb3VwbGUgb2YgbW9yZSBvciBsZXNzCj4+Pj4gaGFj a2lzaCBhdHRlbXB0cyB0byBkbyB0aGlzIGJlZm9yZSwgYW5kIGlmIGl0J3MgYSBfZHJpdmVyXyBp bnRlcmZhY2Ugd2UKPj4+PiBkb24ndCBuZWVkIHRvIGJlIHRoYXQgY2FyZWZ1bCBidXQgaWYgaXQg aXMgYSBfZ2VuZXJpY18gaW50ZXJmYWNlIHdlIG5lZWQKPj4+PiB0byBiZSB2ZXJ5IGNhcmVmdWwg dG8gbWFrZSBpdCBmaXQgKmFsbCogdGhlIGhhcmR3YXJlIG91dCB0aGVyZSBhbmQgdGhhdAo+Pj4+ IHdlIG1ha2UgYWxsIHBvdGVudGlhbCB1c2VycyB1c2UgdGhlIGludGVyZmFjZSBpbiBhIHdheSB0 aGF0IGNvbmZvcm1zCj4+Pj4gd2l0aCB0aGUgaW50ZXJmYWNlIHNwZWNpZmljYXRpb24uCj4+Pj4K Pj4+PiBXaGF0IHdpbGwgaGFwcGVuIG90aGVyd2lzZSBpcyB0aGF0IGFwcHMgd3JpdHRlbiBmb3Ig Y29oZXJlbnQgZmFzdAo+Pj4+IGhhcmR3YXJlIG1pZ2h0LCBmb3IgZXhhbXBsZSwgaWdub3JlIGNh bGxpbmcgdGhlIFNZTkMgYXBpLCBqdXN0IGJlY2F1c2UKPj4+PiB0aGUgYXBwIHdyaXRlciBvbmx5 IGNhcmVkIGFib3V0IGhpcyBvd24gaGFyZHdhcmUgb24gd2hpY2ggdGhlIGFwcCB3b3Jrcwo+Pj4+ IGZpbmUuIFRoYXQgd291bGQgZmFpbCBtaXNlcmFibHkgaWYgdGhlIHNhbWUgYXBwIHdhcyBydW4g b24gaW5jb2hlcmVudAo+Pj4+IGhhcmR3YXJlLCBvciB0aGUgaW5jb2hlcmVudCBoYXJkd2FyZSBk cml2ZXIgbWFpbnRhaW5lcnMgd291bGQgYmUgZm9yY2VkCj4+Pj4gdG8gYmFzZSBhbiBpbXBsZW1l bnRhdGlvbiBvbiBwYWdlLWZhdWx0cyB3aGljaCB3b3VsZCBiZSB2ZXJ5IHNsb3cuCj4+Pj4KPj4+ PiBTbyBhc3N1bWUgdGhlIGZvbGxvd2luZyB1c2UgY2FzZTogQW4gYXBwIHVwZGF0ZXMgYSAxMHgx MCBhcmVhIHVzaW5nIHRoZQo+Pj4+IENQVSBvbiBhIDE2MDB4MTIwMCBkbWEtYnVmLCBhbmQgaXQg d2lsbCB0aGVuIHVzZSB0aGUgZG1hLWJ1ZiBmb3IKPj4+PiB0ZXh0dXJpbmcuIE9uIHNvbWUgaGFy ZHdhcmUgdGhlIGRtYS1idWYgbWlnaHQgYmUgdGlsZWQgaW4gYSB2ZXJ5Cj4+Pj4gc3BlY2lmaWMg d2F5LCBvbiB2bXdnZnggdGhlIGRtYS1idWYgaXMgYSBHUFUgYnVmZmVyIG9uIHRoZSBob3N0LCBv bmx5Cj4+Pj4gYWNjZXNzaWJsZSB1c2luZyBETUEuIE9uIHZtd2dmeCB0aGUgU1lOQyBvcGVyYXRp b24gbXVzdCBjYXJyeSBvdXQgYQo+Pj4+IDEweDEwIERNQSBmcm9tIHRoZSBob3N0IEdQVSBidWZm ZXIgdG8gYSBndWVzdCBDUFUgYnVmZmVyIGJlZm9yZSB0aGUgQ1BVCj4+Pj4gd3JpdGUgYW5kIGEg RE1BIGJhY2sgYWdhaW4gYWZ0ZXIgdGhlIHdyaXRlLCBiZWZvcmUgR1BVIHVzYWdlLiBPbiB0aGUK Pj4+PiB0aWxlZCBhcmNoaXRlY3R1cmUgdGhlIFNZTkMgb3BlcmF0aW9uIG11c3QgdW50aWxlIGJl Zm9yZSBDUFUgYWNjZXNzIGFuZAo+Pj4+IHByb2JhYmx5IHRpbGUgYWdhaW4gYmVmb3JlIEdQVSBh Y2Nlc3MuCj4+Pj4KPj4+PiBJZiB3ZSBub3cgaGF2ZSBhIG9uZS1kaW1lbnNpb25hbCBTWU5DIGFw aSwgaW4gdGhpcyBwYXJ0aWN1bGFyIGNhc2Ugd2UnZAo+Pj4+IGVpdGhlciBuZWVkIHRvIHN5bmMg YSBmYXIgdG9vIGxhcmdlIGFyZWEgKDE2MDB4MTApIG9yIGNhbGwgU1lOQyAxMCB0aW1lcwo+Pj4+ IGJlZm9yZSB3cml0aW5nLCBhbmQgdGhlbiBhZ2FpbiBhZnRlciB3cml0aW5nLiBJZiB0aGUgYXBw IGZvcmdvdCB0byBjYWxsCj4+Pj4gU1lOQyB3ZSBtdXN0IGVycm9yLgo+Pj4+Cj4+Pj4gU28gdG8g c3VtbWFyaXplLCB0aGUgZmFjdCB0aGF0IHRoZSBpbnRlcmZhY2UgaXMgZ2VuZXJpYyBJTU8gbWVh bnM6Cj4+Pj4KPj4+PiAxKSBBbnkgdXNlciBtdXN0IGJlIGFibGUgdG8gbWFrZSB2YWxpZCBhc3N1 bXB0aW9ucyBhYm91dCB0aGUgaW50ZXJuYWwKPj4+PiBmb3JtYXQgb2YgdGhlIGRtYS1idWYuICh1 bnRpbGVkLCBjb2xvciBmb3JtYXQsIHN0cmlkZSBldGMuKQo+Pj4+IDIpIEFueSB1c2VyICptdXN0 KiBjYWxsIFNZTkMgYmVmb3JlIGFuZCBhZnRlciBDUFUgYWNjZXNzLiBPbiBjb2hlcmVudAo+Pj4+ IGFyY2hpdGVjdHVyZXMsIHRoZSBTWU5DIGlzIGEgTlVMTCBvcGVyYXRpb24gYW55d2F5LCBhbmQg dGhhdCBzaG91bGQgYmUKPj4+PiBkb2N1bWVudGVkIHNvbWV3aGVyZSBzbyB0aGF0IG1haW50YWlu ZXJzIG9mIGRyaXZlcnMgb2YgdW5jb2hlcmVudAo+Pj4+IGFyY2hpdGVjdHVyZXMgaGF2ZSBzb21l d2hlcmUgdG8gcG9pbnQgdGhlaXIgZmluZ2Vycy4KPj4+PiAzKSBEcml2ZXItc3BlY2lmaWMgaW1w bGVtZW50YXRpb25zIG11c3QgYmUgYWxsb3dlZCB0byBlcnJvciAoc2VnZmF1bHQpCj4+Pj4gaWYg U1lOQyBoYXMgbm90IGJlZW4gdXNlZC4KPj4+IEkgdGhpbmsgaGVyZSB5b3UgYXJlIHRvbyBsYXgs IHRoZSBjb21tb24gY29kZSBtdXN0IHNlZ2ZhdWx0IG9yCj4+PiBlcnJvciBiYWRseSBpZiBTWU5D IGhhcyBub3QgYmVlbiB1c2UgaW4gYWxsIGNhc2VzIGV2ZW4gb24gY2FjaGUKPj4+IGNvaGVyZW50 IGFyY2guIFRoZSBkZXZpY2UgZHJpdmVyIHN5bmMgY2FsbGJhY2sgY2FuIHN0aWxsIGJlIGEKPj4+ IG5vIG9wZXJhdGlvbi4gQnV0IGkgdGhpbmsgdGhhdCB3ZSBuZWVkIHRvIGluc2lzdCBzdHJvbmds eSBvbiBhCj4+PiBwcm9wZXIgc3luYyBjYWxsIGJlaW5nIG1hZGUgKGFuZCB3ZSBzaG91bGQgZm9y YmlkIGVtcHR5IGFyZWEKPj4+IHN5bmMgY2FsbCkuIFRoaXMgd291bGQgYmUgdGhlIG9ubHkgd2F5 IHRvIG1ha2Ugc3VyZSB1c2Vyc3BhY2UKPj4+IGJlaGF2ZSBwcm9wZXJseSBhcyBvdGhlcndpc2Ug d2UgZW5kdXAgaW4gdGhlIHNpdHVhdGlvbiB5b3Ugd2VyZQo+Pj4gZGVzY3JpYmluZyBhYm92ZSwg d2hlcmUgdGhlIGFwcCBpcyBkZXNpZ24gb24gYSBjYWNoZSBjb2hlcmVudAo+Pj4gYXJjaCBhbmQg d29ya3MgZmluZSB0aGVyZSBidXQgYnJva2UgaW4gc3VidGxlIHdheSBvbiBub24gY2FjaGUKPj4+ IGNvaGVyZW50IGFyY2ggYW5kIGFwcCBkZXZlbG9wZXIgaXMgY2x1ZWxlc3Mgb2Ygd2h5Lgo+Pj4K Pj4+IEkganVzdCBkbyBub3QgdHJ1c3QgdXNlcnNwYWNlLgo+PiBJIGFncmVlIGFuZCBpZGVhbGx5 IGknZCB3YW50IGl0IHRoaXMgd2F5IGFzIHdlbGwuIFRoZSBxdWVzdGlvbiBpcywgaXMgaXQKPj4g cG9zc2libGU/IENhbiB0aGlzIGJlIGRvbmUgd2l0aG91dCBhIGZhdWx0KCkgaGFuZGxlciBpbiB0 aGUgZ2VuZXJpYwo+PiBrZXJuZWwgY29kZT8KPj4KPj4+PiA0KSBUaGUgdXNlLWNhc2Ugc3RhdGVk IGFib3ZlIGNsZWFybHkgc2hvd3MgdGhlIGJlbmVmaXQgb2YgYQo+Pj4+IDItZGltZW5zaW9uYWwg c3luYyBpbnRlcmZhY2UgKHdlIHdhbnQgdG8gc3luYyB0aGUgMTB4MTAgcmVnaW9uKSwgYnV0Cj4+ Pj4gd2hhdCBpZiBzb21lb25lIGluIHRoZSBmdXR1cmUgd2FudHMgdG8gdXNlIHRoaXMgaW50ZXJm YWNlIGZvciBhIDNECj4+Pj4gdGV4dHVyZT8gV2lsbCBhIDJEIHN5bmMgc3VmZmljZT8gQ2FuIHdl IG1ha2UgdGhlIFNZTkMgaW50ZXJmYWNlCj4+Pj4gZXh0ZW5kYWJsZSBpbiBhIHdheSB0aGF0IGFu IGVudW0gc3luY190eXBlIG1lbWJlciBkZWZpbmVzIHRoZSBsYXlvdXQgb2YKPj4+PiB0aGUgYXJn dW1lbnQsIGFuZCBpbml0aWFsbHkgd2UgaW1wbGVtZW50IG9ubHkgMWQsIDJkIHN5bmMsIGxlYXZp bmcgM2QKPj4+PiBmb3IgdGhlIGZ1dHVyZT8KPj4+Pgo+Pj4+IEFsc28sIEkgYWdyZWUgdGhlcmUg aXMgcHJvYmFibHkgbm8gZ29vZCB3YXkgdG8gZ2VuZXJpY2FsbHkgaW1wbGVtZW50IGFuCj4+Pj4g ZXJyb3IgaWYgU1lOQyBoYXMgbm90IGJlZW4gY2FsbGVkLiBUaGF0IG5lZWRzIHRvIGJlIGxlZnQg YXMgYW4gb3B0aW9uIHRvCj4+Pj4gZHJpdmVycy4KPj4+IEkgdGhpbmsgdGhlcmUgaXMsIGp1c3Qg Zm9yYmlkIGFueSBmdXJ0aGVyIHVzZSBvZiB0aGUgZG1hIGJ1ZmZlciwgbWFyawo+Pj4gaXQgYXMg aW52YWxpZCBhbmQgcHJpbnRrIGEgYmlnIGVycm9yLiBVc2Vyc3BhY2UgYXBwIGRldmVsb3BlciB3 aWxsCj4+PiBxdWlja2x5IHNlZSB0aGF0IHNvbWV0aGluZyBpcyB3cm9uZyBhbmQgbG9va2luZyBh dCBrZXJuZWwgbG9nIHNob3VsZAo+Pj4gZXhwbGFpbiB3aHkuCj4+IFRoZSBwcm9ibGVtIGlzIGlm IHNvbWVvbmUgY2FsbHMgbW1hcCgpIGFuZCB0aGVuIGRlY2lkZXMgdG8gbm90IGFjY2Vzcwo+PiB0 aGUgYnVmZmVyIGJlZm9yZSBtdW5tYXAoKSBvciBHUFUgdXNhZ2UuIEhvdyBkbyB3ZSByZWNvZ25p emUgdGhhdCBjYXNlCj4+IGFuZCBzZXBhcmF0ZSBpdCBmcm9tIGEgQ1BVIGFjY2VzcyBvY2N1cmVk IG91dHNpZGUgYSBzeW5jPyBXZSBjb3VsZCwgYXMKPj4gbWVudGlvbmVkIGFib3ZlIGhhdmUgYSBm YXVsdCgpIGhhbmRsZXIgaW4gdGhlIGdlbmVyaWMga2VybmVsIGNvZGUgYW5kCj4+IG1ha2Ugc3Vy ZSBkcml2ZXJzIGRvbid0IHBvcHVsYXRlIFBURXMgdW50aWwgdGhlIGZpcnN0IGZhdWx0KCkuIEFu b3RoZXIKPj4gb3B0aW9uIHdvdWxkIGJlIHRvIHNjYW4gYWxsIFBURXMgZm9yIGFuICJhY2Nlc3Nl ZCIgZmxhZywgYnV0IEknbSBub3QKPj4gZXZlbiBzdXJlIGFsbCBDUFUgYXJjaGl0ZWN0dXJlcyBo YXZlIHN1Y2ggYSBmbGFnPwo+Pgo+PiBCdXQgdGhlcmUgbWlnaHQgYmUgYSBzaW1wbGVyIHNvbHV0 aW9uIHRoYXQgSSBoYXZlIG92ZXJsb29rZWQ/Cj4gQWxsIGFyY2ggaGF2ZSBhIGRpcnR5IGZsYWcs IHNvIHlvdSBjb3VsZCBjaGVjayB0aGF0LCBhcyBhbGwgd2UKPiByZWFsbHkgY2FyZSBhYm91dCBp cyBDUFUgd3JpdGUgYWNjZXNzLiBTbyBhbGwgeW91IG5lZWQgaXMgY2xlYXJpbmcKPiB0aGUgZGly dHkgYml0IGFmdGVyIGVhY2ggc3VjY2Vzc2Z1bGwgR1BVIGNvbW1hbmQgc3RyZWFtIGlvY3RsCj4g YW5kIGNoZWNraW5nIHRoYXQgbm8gZGlydHkgYml0IGlzIHNldCBpbiBhIHJlZ2lvbiBub3QgY292 ZXIgYnkKPiBhIGZsdXNoKCkuIE5vdGUgdGhhdCB0aGUgY2xlYXIgYW5kIGNoZWNrIGNhbiBoYXBw ZW4gaW4gdGhlIHNhbWUKPiBmdW5jdGlvbiBhcyBwYXJ0IG9mIGJ1ZmZlciB2YWxpZGF0aW9uIGZv ciB0aGUgR1BVIGNvbW1hbmQgc3RyZWFtLgoKQWN0dWFsbHksIEkgZG8gdGhpbmsgd2UgY2FyZSBh Ym91dCByZWFkaW5nIGFzIHdlbGwsIHNpbmNlIHJlYWRpbmcKd2l0aG91dCBmbHVzaGluZyBhbnl0 aGluZyB3cml0dGVuIGJ5IHRoZSBHUFUgd2lsbAp5aWVsZCBnYXJiYWdlIG9uIGEgbm9uLWNvaGVy ZW50IGFyY2hpdGVjdHVyZS4gSW5zdGVhZCB3ZSBtaWdodCBjaGVjayBmb3IKdGhlIFBBR0VfQUND RVNTRUQgYml0LgoKU28gdGhlIGZ1bGwgdmVyc2lvbiBvZiB0aGlzIHdvdWxkIGtlZXAgdHJhY2sg b2YgYWxsIHN5bmNlZCByZWdpb25zIGFuZAphdCBidWZmZXIgdmFsaWRhdGlvbiB0aW1lLCBvciB1 bm1hcCB0aW1lIGVycm9yIGlmIHRoZXJlCmlzIGEgcGFnZSBjb21wbGV0ZWx5IG91dHNpZGUgdGhl IHVuaW9uIG9mIGFsbCBzeW5jZWQgcmVnaW9ucyBpbiBhbnkgVk1BCmJlbG9uZ2luZyB0byB0aGUg ZG1hLWJ1ZiBhZGRyZXNzIHNwYWNlLCB0aGVuIHVubWFyayBhbGwgYWNjZXNzZWQgUFRFcwphbmQg aW52YWxpZGF0ZSBUTEJzIGFjY29yZGluZ2x5LCB0eXBpY2FsbHkgY2F1c2luZyBhIGdsb2JhbCBU TEIgZmx1c2guClllYWgsIHdlIGNvdWxkIHByb2JhYmx5IHB1dCB0b2dldGhlciBhIGhlbHBlciBm dW5jdGlvbiB0aGF0IGRvZXMgdGhpcywKYnV0IGl0IHdpbGwgYmUgZXhwZW5zaXZlIHRvIHJ1biBh bmQgdGhlIHdob2xlIHBvaW50IG9mIHRoaXMgQVBJIGlzIHRvIGJlCmFibGUgdG8gaW1wcm92ZSBw ZXJmb3JtYW5jZS4KCklNTyB3ZSBzaG91bGQgcHJvYmFibHkgZG8gdGhpcyBhbmQgYWZ0ZXIgcmVs ZXZhbnQgcGVyZm9ybWFuY2UgdGVzdGluZwpkZWNpZGUgd2hldGhlciB0byBlaXRoZXIgZXhwb3Nl IGEgd2F5IHRvIHR1cm4gaXQgb2ZmLCBlaXRoZXIgdXNpbmcgYQpjb21waWxlLXRpbWUgb3B0aW9u IG9yIHJ1bi10aW1lLCBsaWtlIGEgZmxhZyBpbiB0aGUgU1lOQyBpb2N0bC4KCi9UaG9tYXMKCj4K PiBDaGVlcnMsCj4gSsOpcsO0bWUKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5nIGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVk ZXNrdG9wLm9yZwpodHRwOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8v ZHJpLWRldmVsCg==