From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: [PATCH] drm/i915: Preallocate request before access of the ring Date: Mon, 29 Jun 2015 14:39:32 +0300 Message-ID: <87pp4eyc97.fsf@intel.com> References: <1430323845-28906-1-git-send-email-yu.dai@intel.com> <55422611.7030902@intel.com> <20150506100603.GN30184@phenom.ffwll.local> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTP id 6A6786E878 for ; Mon, 29 Jun 2015 04:37:01 -0700 (PDT) In-Reply-To: <20150506100603.GN30184@phenom.ffwll.local> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Daniel Vetter , Dave Gordon Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org T24gV2VkLCAwNiBNYXkgMjAxNSwgRGFuaWVsIFZldHRlciA8ZGFuaWVsQGZmd2xsLmNoPiB3cm90 ZToKPiBPbiBUaHUsIEFwciAzMCwgMjAxNSBhdCAwMTo1NDo0MVBNICswMTAwLCBEYXZlIEdvcmRv biB3cm90ZToKPj4gT24gMjkvMDQvMTUgMTc6MTAsIHl1LmRhaUBpbnRlbC5jb20gd3JvdGU6Cj4+ ID4gRnJvbTogQWxleCBEYWkgPHl1LmRhaUBpbnRlbC5jb20+Cj4+ID4gCj4+ID4gVGhpcyBpcyB0 byBhdm9pZCBiYWQgSU8gYWNjZXNzIGNhdXNlZCBieSB3cml0aW5nIE5PT1AgdG8gd3JhcCB0aGUK Pj4gPiByaW5nIGJ1ZmZlciB3aGlsc3QgcmluZyBpcyB1bnBpbm5lZC4KPj4gPiAKPj4gPiBTaWdu ZWQtb2ZmLWJ5OiBBbGV4IERhaSA8eXUuZGFpQGludGVsLmNvbT4KPj4gPiAtLS0KPj4gPiAgZHJp dmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfbHJjLmMgfCA2ICsrKy0tLQo+PiA+ICAxIGZpbGUgY2hh bmdlZCwgMyBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygtKQo+PiA+IAo+PiA+IGRpZmYgLS1n aXQgYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9scmMuYyBiL2RyaXZlcnMvZ3B1L2RybS9p OTE1L2ludGVsX2xyYy5jCj4+ID4gaW5kZXggNzMyZmQ2My4uM2U4ZmNmZCAxMDA2NDQKPj4gPiAt LS0gYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9scmMuYwo+PiA+ICsrKyBiL2RyaXZlcnMv Z3B1L2RybS9pOTE1L2ludGVsX2xyYy5jCj4+ID4gQEAgLTgwMywxMiArODAzLDEyIEBAIHN0YXRp YyBpbnQgaW50ZWxfbG9naWNhbF9yaW5nX2JlZ2luKHN0cnVjdCBpbnRlbF9yaW5nYnVmZmVyICpy aW5nYnVmLAo+PiA+ICAJaWYgKHJldCkKPj4gPiAgCQlyZXR1cm4gcmV0Owo+PiA+ICAKPj4gPiAt CXJldCA9IGxvZ2ljYWxfcmluZ19wcmVwYXJlKHJpbmdidWYsIGN0eCwgbnVtX2R3b3JkcyAqIHNp emVvZih1aW50MzJfdCkpOwo+PiA+ICsJLyogUHJlYWxsb2NhdGUgdGhlIG9sciBiZWZvcmUgdG91 Y2hpbmcgdGhlIHJpbmcgKi8KPj4gPiArCXJldCA9IGk5MTVfZ2VtX3JlcXVlc3RfYWxsb2Mocmlu ZywgY3R4KTsKPj4gPiAgCWlmIChyZXQpCj4+ID4gIAkJcmV0dXJuIHJldDsKPj4gPiAgCj4+ID4g LQkvKiBQcmVhbGxvY2F0ZSB0aGUgb2xyIGJlZm9yZSB0b3VjaGluZyB0aGUgcmluZyAqLwo+PiA+ IC0JcmV0ID0gaTkxNV9nZW1fcmVxdWVzdF9hbGxvYyhyaW5nLCBjdHgpOwo+PiA+ICsJcmV0ID0g bG9naWNhbF9yaW5nX3ByZXBhcmUocmluZ2J1ZiwgY3R4LCBudW1fZHdvcmRzICogc2l6ZW9mKHVp bnQzMl90KSk7Cj4+ID4gIAlpZiAocmV0KQo+PiA+ICAJCXJldHVybiByZXQ7Cj4+IAo+PiBSZXZp ZXdlZC1ieTogRGF2ZSBHb3Jkb24gPGRhdmlkLnMuZ29yZG9uQGludGVsLmNvbT4KPj4gCj4+IHdp dGggaW5wdXQgYWxzbyBmcm9tIEpvaG4gSGFycmlzb24gPGpvaG4uYy5oYXJyaXNvbkBpbnRlbC5j b20+LCB3aG8KPj4gd291bGQgbGlrZSB0byBwb2ludCBvdXQgdGhhdCB0aGlzIHdpbGwgYmUgc3Vw ZXJjZWRlZCBieSB0aGUgQW50aS1PTFIKPj4gcGF0Y2hlcyBhbHJlYWR5IHBvc3RlZC4gKEluIHRo YXQgbW9kZWwsIHRoZSByZXF1ZXN0IHdpbGwgYmUgYWxsb2NhdGVkCj4+IG11Y2ggZWFybGllciwg YW5kIHBhc3NlZCBhcm91bmQgZXhwbGljaXRseSByYXRoZXIgdGhhbiBkYW5nbGluZyBmcm9tIHRo ZQo+PiBjb250ZXh0KS4KPgo+IERvIHdlIG5lZWQgdGhpcyBmb3IgZXhlY2xpc3QgaW4gZ2VuZXJh bCwgaS5lLiBjYzogc3RhYmxlPyBXaGVyZSdzIHRoZSBidWcKPiByZXBvcnQvaWd0IHRlc3RjYXNl Pwo+Cj4gRm9yIHNlcmlvdXMtbG9va2luZyBidWdzIHBsZWFzZSBhZGQgbW9yZSBkZXRhaWxzIGxp a2UgdGhhdCB0byB0aGUgY29tbWl0Cj4gbWVzc2FnZSwgb3RoZXJ3aXNlIG1haW50YWluZXJzIGhh dmUgbm8gaWRlYSB3aGVyZSB0byBhcHBseSBhIHBhdGNoLgoKQW5kIGR1ZSB0byBubyByZXBseSwg dGhlIG1haW50YWluZXJzIGhhdmUgZm9yZ290dGVuIGFib3V0IHBhdGNoZXMgbGlrZQp0aGlzLiBE cm9wcGluZyBmcm9tIG15IGZpeGVzIHF1ZXVlLgoKQlIsCkphbmkuCgoKCgoKCj4KPiBUaGFua3Ms IERhbmllbAo+IC0tIAo+IERhbmllbCBWZXR0ZXIKPiBTb2Z0d2FyZSBFbmdpbmVlciwgSW50ZWwg Q29ycG9yYXRpb24KPiBodHRwOi8vYmxvZy5mZndsbC5jaAoKLS0gCkphbmkgTmlrdWxhLCBJbnRl bCBPcGVuIFNvdXJjZSBUZWNobm9sb2d5IENlbnRlcgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBs aXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFu L2xpc3RpbmZvL2ludGVsLWdmeAo=