From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tvrtko Ursulin Subject: Re: [PATCH 13/13] drm/i915: Cache last IRQ seqno to reduce IRQ overhead Date: Fri, 11 Dec 2015 14:28:00 +0000 Message-ID: <566ADD70.4030201@linux.intel.com> References: <1449839521-21958-1-git-send-email-John.C.Harrison@Intel.com> <1449839521-21958-14-git-send-email-John.C.Harrison@Intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTP id 9FC5F7A25E for ; Fri, 11 Dec 2015 06:28:02 -0800 (PST) In-Reply-To: <1449839521-21958-14-git-send-email-John.C.Harrison@Intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: John.C.Harrison@Intel.com, Intel-GFX@Lists.FreeDesktop.Org List-Id: intel-gfx@lists.freedesktop.org CgpPbiAxMS8xMi8xNSAxMzoxMiwgSm9obi5DLkhhcnJpc29uQEludGVsLmNvbSB3cm90ZToKPiBG cm9tOiBKb2huIEhhcnJpc29uIDxKb2huLkMuSGFycmlzb25ASW50ZWwuY29tPgo+Cj4gVGhlIG5v dGlmeSBmdW5jdGlvbiBjYW4gYmUgY2FsbGVkIG1hbnkgdGltZXMgd2l0aG91dCB0aGUgc2Vxbm8K PiBjaGFuZ2luZy4gQSBsYXJnZSBudW1iZXIgb2YgZHVwbGljYXRlcyBhcmUgdG8gcHJldmVudCBy YWNlcyBkdWUgdG8gdGhlCj4gcmVxdWlyZW1lbnQgb2Ygbm90IGVuYWJsaW5nIGludGVycnVwdHMg dW50aWwgcmVxdWVzdGVkLiBIb3dldmVyLCB3aGVuCj4gaW50ZXJydXB0cyBhcmUgZW5hYmxlZCB0 aGUgSVJRIGhhbmRsZSBjYW4gYmUgY2FsbGVkIG11bHRpcGxlIHRpbWVzCj4gd2l0aG91dCB0aGUg cmluZydzIHNlcW5vIHZhbHVlIGNoYW5naW5nLiBUaGlzIHBhdGNoIHJlZHVjZXMgdGhlCj4gb3Zl cmhlYWQgb2YgdGhlc2UgZXh0cmEgY2FsbHMgYnkgY2FjaGluZyB0aGUgbGFzdCBwcm9jZXNzZWQg c2Vxbm8KPiB2YWx1ZSBhbmQgZWFybHkgZXhpdGluZyBpZiBpdCBoYXMgbm90IGNoYW5nZWQuCj4K PiB2MzogTmV3IHBhdGNoIGZvciBzZXJpZXMuCj4KPiBGb3I6IFZJWi01MTkwCj4gU2lnbmVkLW9m Zi1ieTogSm9obiBIYXJyaXNvbiA8Sm9obi5DLkhhcnJpc29uQEludGVsLmNvbT4KPiAtLS0KPiAg IGRyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtLmMgICAgICAgICB8IDE0ICsrKysrKysrKysr LS0tCj4gICBkcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9yaW5nYnVmZmVyLmggfCAgMSArCj4g ICAyIGZpbGVzIGNoYW5nZWQsIDEyIGluc2VydGlvbnMoKyksIDMgZGVsZXRpb25zKC0pCj4KPiBk aWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaTkxNV9nZW0uYyBiL2RyaXZlcnMvZ3B1 L2RybS9pOTE1L2k5MTVfZ2VtLmMKPiBpbmRleCAyNzlkNzlmLi4zYzg4Njc4IDEwMDY0NAo+IC0t LSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ2VtLmMKPiArKysgYi9kcml2ZXJzL2dwdS9k cm0vaTkxNS9pOTE1X2dlbS5jCj4gQEAgLTI0NTcsNiArMjQ1Nyw4IEBAIGk5MTVfZ2VtX2luaXRf c2Vxbm8oc3RydWN0IGRybV9kZXZpY2UgKmRldiwgdTMyIHNlcW5vKQo+Cj4gICAJCWZvciAoaiA9 IDA7IGogPCBBUlJBWV9TSVpFKHJpbmctPnNlbWFwaG9yZS5zeW5jX3NlcW5vKTsgaisrKQo+ICAg CQkJcmluZy0+c2VtYXBob3JlLnN5bmNfc2Vxbm9bal0gPSAwOwo+ICsKPiArCQlyaW5nLT5sYXN0 X2lycV9zZXFubyA9IDA7Cj4gICAJfQo+Cj4gICAJcmV0dXJuIDA7Cj4gQEAgLTI3ODgsMTEgKzI3 OTAsMTQgQEAgdm9pZCBpOTE1X2dlbV9yZXF1ZXN0X25vdGlmeShzdHJ1Y3QgaW50ZWxfZW5naW5l X2NzICpyaW5nLCBib29sIGZlbmNlX2xvY2tlZCkKPiAgIAkJcmV0dXJuOwo+ICAgCX0KPgo+IC0J aWYgKCFmZW5jZV9sb2NrZWQpCj4gLQkJc3Bpbl9sb2NrX2lycXNhdmUoJnJpbmctPmZlbmNlX2xv Y2ssIGZsYWdzKTsKPiAtCj4gICAJc2Vxbm8gPSByaW5nLT5nZXRfc2Vxbm8ocmluZywgZmFsc2Up Owo+ICAgCXRyYWNlX2k5MTVfZ2VtX3JlcXVlc3Rfbm90aWZ5KHJpbmcsIHNlcW5vKTsKPiArCWlm IChzZXFubyA9PSByaW5nLT5sYXN0X2lycV9zZXFubykKPiArCQlyZXR1cm47Cj4gKwlyaW5nLT5s YXN0X2lycV9zZXFubyA9IHNlcW5vOwoKSG1tbS4uIGRvIHlvdSB3YW50IHRvIG1ha2UgdGhlIGNo ZWNrICJzZXFubyA8PSByaW5nLT5sYXN0X2lycV9zZXFubyIgPwoKSXMgdGhlcmUgYSBwb3NzaWJp bGl0eSBmb3Igc29tZSB3ZWlyZCB0aW1pbmcgb3IgY2FjaGluZyBpc3N1ZSB3aGVyZSB0d28gCmNh bGxlcnMgZ2V0IGluIGFuZCBsYXN0X2lycV9zZXFubyBnb2VzIGJhY2t3YXJkcz8gTm90IHN1cmUg dGhhdCBpdCB3b3VsZCAKY2F1c2UgYSBwcm9ibGVtLCBidXQgcGF0dGVybiBpcyB1bnVzdWFsIGFu ZCBoYXJkIHRvIHVuZGVyc3RhbmQgZm9yIG1lLgoKQWxzbyBjaGVjayBhbmQgdGhlIGFzc2lnbm1l bnQgd291bGQgbmVlZCB0byBiZSB1bmRlciB0aGUgc3BpbmxvY2sgSSB0aGluay4KCj4gKwo+ICsJ aWYgKCFmZW5jZV9sb2NrZWQpCj4gKwkJc3Bpbl9sb2NrX2lycXNhdmUoJnJpbmctPmZlbmNlX2xv Y2ssIGZsYWdzKTsKPgo+ICAgCWxpc3RfZm9yX2VhY2hfZW50cnlfc2FmZShyZXEsIHJlcV9uZXh0 LCAmcmluZy0+ZmVuY2Vfc2lnbmFsX2xpc3QsIHNpZ25hbF9saW5rKSB7Cj4gICAJCWlmICghcmVx LT5jYW5jZWxsZWQpIHsKPiBAQCAtMzE2Myw3ICszMTY4LDEwIEBAIHN0YXRpYyB2b2lkIGk5MTVf Z2VtX3Jlc2V0X3JpbmdfY2xlYW51cChzdHJ1Y3QgZHJtX2k5MTVfcHJpdmF0ZSAqZGV2X3ByaXYs Cj4gICAJICogVGlkeSB1cCBhbnl0aGluZyBsZWZ0IG92ZXIuIFRoaXMgaW5jbHVkZXMgYSBjYWxs IHRvCj4gICAJICogaTkxNV9nZW1fcmVxdWVzdF9ub3RpZnkoKSB3aGljaCB3aWxsIG1ha2Ugc3Vy ZSB0aGF0IGFueSByZXF1ZXN0cwo+ICAgCSAqIHRoYXQgd2VyZSBvbiB0aGUgc2lnbmFsIHBlbmRp bmcgbGlzdCBnZXQgYWxzbyBjbGVhbmVkIHVwLgo+ICsJICogTkI6IFRoZSBzZXFubyBjYWNoZSBt dXN0IGJlIGNsZWFyZWQgb3RoZXJ3aXNlIHRoZSBub3RpZnkgY2FsbCB3aWxsCj4gKwkgKiBzaW1w bHkgcmV0dXJuIGltbWVkaWF0ZWx5Lgo+ICAgCSAqLwo+ICsJcmluZy0+bGFzdF9pcnFfc2Vxbm8g PSAwOwo+ICAgCWk5MTVfZ2VtX3JldGlyZV9yZXF1ZXN0c19yaW5nKHJpbmcpOwo+Cj4gICAJLyog SGF2aW5nIGZsdXNoZWQgYWxsIHJlcXVlc3RzIGZyb20gYWxsIHF1ZXVlcywgd2Uga25vdyB0aGF0 IGFsbAo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9yaW5nYnVmZmVy LmggYi9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9yaW5nYnVmZmVyLmgKPiBpbmRleCA5ZDA5 ZWRiLi4xOTg3YWJkIDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX3Jp bmdidWZmZXIuaAo+ICsrKyBiL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX3JpbmdidWZmZXIu aAo+IEBAIC0zNTYsNiArMzU2LDcgQEAgc3RydWN0ICBpbnRlbF9lbmdpbmVfY3Mgewo+ICAgCXNw aW5sb2NrX3QgZmVuY2VfbG9jazsKPiAgIAlzdHJ1Y3QgbGlzdF9oZWFkIGZlbmNlX3NpZ25hbF9s aXN0Owo+ICAgCXN0cnVjdCBsaXN0X2hlYWQgZmVuY2VfdW5zaWduYWxfbGlzdDsKPiArCXVpbnQz Ml90IGxhc3RfaXJxX3NlcW5vOwo+ICAgfTsKPgo+ICAgYm9vbCBpbnRlbF9yaW5nX2luaXRpYWxp emVkKHN0cnVjdCBpbnRlbF9lbmdpbmVfY3MgKnJpbmcpOwo+CgpSZWdhcmRzLAoKVHZydGtvCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBt YWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwOi8vbGlzdHMu ZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cg==