From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH v3] drm/i915: Optimistically spin for the
 request completion
Date: Fri, 20 Mar 2015 15:54:01 +0100
Message-ID: <20150320145401.GR1349@phenom.ffwll.local>
References: <20150312091743.GT3800@phenom.ffwll.local>
 <1426158677-26261-1-git-send-email-chris@chris-wilson.co.uk>
 <20150319151615.GQ10812@nuc-i3427.alporthouse.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mail-wi0-f177.google.com (mail-wi0-f177.google.com
 [209.85.212.177])
 by gabe.freedesktop.org (Postfix) with ESMTP id 98D256EC56
 for <intel-gfx@lists.freedesktop.org>; Fri, 20 Mar 2015 07:52:50 -0700 (PDT)
Received: by wibgn9 with SMTP id gn9so16737141wib.1
 for <intel-gfx@lists.freedesktop.org>; Fri, 20 Mar 2015 07:52:49 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <20150319151615.GQ10812@nuc-i3427.alporthouse.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org, Daniel Vetter <daniel.vetter@ffwll.ch>
List-Id: intel-gfx@lists.freedesktop.org

T24gVGh1LCBNYXIgMTksIDIwMTUgYXQgMDM6MTY6MTVQTSArMDAwMCwgQ2hyaXMgV2lsc29uIHdy
b3RlOgo+IE9uIFRodSwgTWFyIDEyLCAyMDE1IGF0IDExOjExOjE3QU0gKzAwMDAsIENocmlzIFdp
bHNvbiB3cm90ZToKPiA+IFRoaXMgcHJvdmlkZXMgYSBuaWNlIGJvb3N0IHRvIG1lc2EgaW4gc3dh
cCBib3VuZCBzY2VuYXJpb3MgKGFzIG1lc2EKPiA+IHRocm90dGxlcyBpdHNlbGYgdG8gdGhlIHBy
ZXZpb3VzIGZyYW1lIGFuZCBnaXZlbiB0aGUgc2NlbmFyaW8gdGhhdCB3aWxsCj4gPiBjb21wbGV0
ZSBzaG9ydGx5KS4gSXQgd2lsbCBhbHNvIHByb3ZpZGUgYSBnb29kIGJvb3N0IHRvIHN5c3RlbXMg
cnVubmluZwo+ID4gd2l0aCBzZW1hcGhvcmVzIGRpc2FibGVkIGFuZCBzbyBmcmVxdWVudGx5IHdh
aXRpbmcgb24gdGhlIEdQVSBhcyBpdAo+ID4gc3dpdGNoZXMgcmluZ3MuIEluIHRoZSBtb3N0IGZh
dm91cmFibGUgb2YgbWljcm9iZW5jaG1hcmtzLCB0aGlzIGNhbgo+ID4gaW5jcmVhc2UgcGVyZm9y
bWFuY2UgYnkgYXJvdW5kIDE1JSAtIHRob3VnaCBpbiBwcmFjdGljZSBpbXByb3ZlbWVudHMKPiA+
IHdpbGwgYmUgbWFyZ2luYWwgYW5kIHJhcmVseSBub3RpY2VhYmxlLgo+ID4gCj4gPiB2MjogQWNj
b3VudCBmb3IgdXNlciB0aW1lb3V0cwo+ID4gdjM6IExpbWl0IHRoZSBzcGlubmluZyB0byBhIHNp
bmdsZSBqaWZmaWUgKH4xdXMpIGF0IG1vc3QuIE9uIGFuCj4gPiBvdGhlcndpc2UgaWRsZSBzeXN0
ZW0sIHRoZXJlIGlzIG5vIHNjaGVkdWxlciBjb250ZW50aW9uIGFuZCBzbyB3aXRob3V0IGEKPiA+
IGxpbWl0IHdlIHdvdWxkIHNwaW4gdW50aWwgdGhlIEdQVSBpcyByZWFkeS4KPiA+IAo+ID4gU2ln
bmVkLW9mZi1ieTogQ2hyaXMgV2lsc29uIDxjaHJpc0BjaHJpcy13aWxzb24uY28udWs+Cj4gPiBD
YzogRGFuaWVsIFZldHRlciA8ZGFuaWVsLnZldHRlckBmZndsbC5jaD4KPiAKPiBKdXN0IHJlY29y
ZGluZyBpZGVhcyBmb3IgdGhlIGZ1dHVyZS4gUmVwbGFjZSB0aGUgYnVzeS1zcGluIHdpdGgKPiBt
b25pdG9yL213YWl0LiBUaGlzIHJlcXVpcmVzIFBlbnRpdW00KywgYSBjb29wZXJhdGluZyBHUFUg
d2l0aCB3b3JraW5nCj4gY2FjaGVsaW5lIHNub29waW5nIGFuZCB0aGF0IHdlIHVzZSBIV1Mgc2Vx
bm8uCgpKdXN0IGZvciB0aGUgcmVjb3JkOiBEaWQgaXQgaGVscCB3aXRoIHBvd2Vyc2F2aW5nIG9y
IHdhcyBpdCBhbGwgaW4gdGhlCm5vaXNlPwotRGFuaWVsCgo+IGRpZmYgLS1naXQgYS9kcml2ZXJz
L2dwdS9kcm0vaTkxNS9pOTE1X2dlbS5jIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW0u
Ywo+IGluZGV4IDg1ZTcxZTBlMjM0MC4uNDU0YTM4ZDRjYWEzIDEwMDY0NAo+IC0tLSBhL2RyaXZl
cnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtLmMKPiArKysgYi9kcml2ZXJzL2dwdS9kcm0vaTkxNS9p
OTE1X2dlbS5jCj4gQEAgLTM3LDYgKzM3LDcgQEAKPiAgI2luY2x1ZGUgPGxpbnV4L3N3YXAuaD4K
PiAgI2luY2x1ZGUgPGxpbnV4L3BjaS5oPgo+ICAjaW5jbHVkZSA8bGludXgvZG1hLWJ1Zi5oPgo+
ICsjaW5jbHVkZSA8YXNtL213YWl0Lmg+Cj4gIAo+ICAjZGVmaW5lIFJRX0JVR19PTihleHByKQo+
ICAKPiBAQCAtMTE4NywxOCArMTE4OCw0MiBAQCBzdGF0aWMgaW50IF9faTkxNV9zcGluX3JlcXVl
c3Qoc3RydWN0IGRybV9pOTE1X2dlbV9yZXF1ZXN0ICpyZXEpCj4gICAgICAgICB1bnNpZ25lZCBs
b25nIHRpbWVvdXQ7Cj4gICAgICAgICBpbnQgcmV0ID0gLUVCVVNZOwo+ICAKPiArICAgICAgIGlm
IChyaW5nLT5pcnFfcmVmY291bnQpIC8qIElSUSBpcyBhbHJlYWR5IGFjdGl2ZSwga2VlcCB1c2lu
ZyBpdCAqLwo+ICsgICAgICAgICAgICAgICByZXR1cm4gcmV0Owo+ICsKPiAgICAgICAgIGludGVs
X3VuY29yZV9mb3JjZXdha2VfZ2V0KGRldl9wcml2LCBGT1JDRVdBS0VfQUxMKTsKPiAgICAgICAg
IHRpbWVvdXQgPSBqaWZmaWVzICsgMTsKPiAtICAgICAgIHdoaWxlICghbmVlZF9yZXNjaGVkKCkp
IHsKPiAtICAgICAgICAgICAgICAgaWYgKGk5MTVfZ2VtX3JlcXVlc3RfY29tcGxldGVkKHJlcSwg
dHJ1ZSkpIHsKPiAtICAgICAgICAgICAgICAgICAgICAgICByZXQgPSAwOwo+IC0gICAgICAgICAg
ICAgICAgICAgICAgIGdvdG8gb3V0Owo+IC0gICAgICAgICAgICAgICB9Cj4gKyAgICAgICBpZiAo
dGhpc19jcHVfaGFzKFg4Nl9GRUFUVVJFX01XQUlUKSkgewo+ICsgICAgICAgICAgICAgICBkbyB7
Cj4gKyAgICAgICAgICAgICAgICAgICAgICAgdW5zaWduZWQgbG9uZyBlY3ggPSAxOyAvKiBicmVh
ayBvbiBpbnRlcnJ1cHQgKi8KPiArICAgICAgICAgICAgICAgICAgICAgICB1bnNpZ25lZCBsb25n
IGVheCA9IDA7IC8qIGNzdGF0ZSAqLwo+ICAKPiAtICAgICAgICAgICAgICAgaWYgKHRpbWVfYWZ0
ZXJfZXEoamlmZmllcywgdGltZW91dCkpCj4gLSAgICAgICAgICAgICAgICAgICAgICAgYnJlYWs7
Cj4gKyAgICAgICAgICAgICAgICAgICAgICAgX19tb25pdG9yKCh2b2lkICopJnJpbmctPnN0YXR1
c19wYWdlLnBhZ2VfYWRkcltJOTE1X0dFTV9IV1NfSU5ERVhdLCAwLCAwKTsKPiArICAgICAgICAg
ICAgICAgICAgICAgICBpZiAobmVlZF9yZXNjaGVkKCkpCj4gKyAgICAgICAgICAgICAgICAgICAg
ICAgICAgICAgICBicmVhazsKPiArCj4gKyAgICAgICAgICAgICAgICAgICAgICAgaWYgKGk5MTVf
Z2VtX3JlcXVlc3RfY29tcGxldGVkKHJlcSwgdHJ1ZSkpIHsKPiArICAgICAgICAgICAgICAgICAg
ICAgICAgICAgICAgIHJldCA9IDA7Cj4gKyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBn
b3RvIG91dDsKPiArICAgICAgICAgICAgICAgICAgICAgICB9Cj4gIAo+IC0gICAgICAgICAgICAg
ICBjcHVfcmVsYXhfbG93bGF0ZW5jeSgpOwo+ICsgICAgICAgICAgICAgICAgICAgICAgIGlmICh0
aW1lX2FmdGVyX2VxKGppZmZpZXMsIHRpbWVvdXQpKQo+ICsgICAgICAgICAgICAgICAgICAgICAg
ICAgICAgICAgYnJlYWs7Cj4gKwo+ICsgICAgICAgICAgICAgICAgICAgICAgIF9fbXdhaXQoZWF4
LCBlY3gpOwo+ICsgICAgICAgICAgICAgICB9IHdoaWxlICgxKTsKPiArICAgICAgIH0gZWxzZSB7
Cj4gKyAgICAgICAgICAgICAgIHdoaWxlICghbmVlZF9yZXNjaGVkKCkpIHsKPiArICAgICAgICAg
ICAgICAgICAgICAgICBpZiAoaTkxNV9nZW1fcmVxdWVzdF9jb21wbGV0ZWQocmVxLCB0cnVlKSkg
ewo+ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgcmV0ID0gMDsKPiArICAgICAgICAg
ICAgICAgICAgICAgICAgICAgICAgIGdvdG8gb3V0Owo+ICsgICAgICAgICAgICAgICAgICAgICAg
IH0KPiArCj4gKyAgICAgICAgICAgICAgICAgICAgICAgaWYgKHRpbWVfYWZ0ZXJfZXEoamlmZmll
cywgdGltZW91dCkpCj4gKyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBicmVhazsKPiAr
Cj4gKyAgICAgICAgICAgICAgICAgICAgICAgY3B1X3JlbGF4X2xvd2xhdGVuY3koKTsKPiArICAg
ICAgICAgICAgICAgfQo+ICAgICAgICAgfQo+ICAgICAgICAgaWYgKGk5MTVfZ2VtX3JlcXVlc3Rf
Y29tcGxldGVkKHJlcSwgZmFsc2UpKQo+ICAgICAgICAgICAgICAgICByZXQgPSAwOwo+IAo+IAo+
IC0tIAo+IENocmlzIFdpbHNvbiwgSW50ZWwgT3BlbiBTb3VyY2UgVGVjaG5vbG9neSBDZW50cmUK
Ci0tIApEYW5pZWwgVmV0dGVyClNvZnR3YXJlIEVuZ2luZWVyLCBJbnRlbCBDb3Jwb3JhdGlvbgpo
dHRwOi8vYmxvZy5mZndsbC5jaApfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVz
a3RvcC5vcmcKaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lu
dGVsLWdmeAo=