From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Kuoppala Subject: Re: [PATCH] drm/i915: Only apply a rmw mmio update if the value changes Date: Tue, 17 Sep 2019 16:49:51 +0300 Message-ID: <87ftkvqbgg.fsf@gaia.fi.intel.com> References: <20190917080029.27632-1-chris@chris-wilson.co.uk> 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 ESMTPS id E7FC06EC8D for ; Tue, 17 Sep 2019 13:50:11 +0000 (UTC) In-Reply-To: <20190917080029.27632-1-chris@chris-wilson.co.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Chris Wilson , intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Q2hyaXMgV2lsc29uIDxjaHJpc0BjaHJpcy13aWxzb24uY28udWs+IHdyaXRlczoKCj4gSWYgd2Ug dHJ5IHRvIGNsZWFyLCBvciBldmVuIHNldCwgYSBiaXQgaW4gdGhlIHJlZ2lzdGVyIHRoYXQgZG9l c24ndAo+IGNoYW5nZSB0aGUgcmVnaXN0ZXIgc3RhdGU7IHNraXAgdGhlIHdyaXRlLiBUaGVyZSdz IGEgc2xpZ2h0IGRhbmdlciBpbgo+IHRoYXQgdGhlIHJlZ2lzdGVyIGFjdHMgYXMgYSBsYXRjaC1v bi13cml0ZSwgYnV0IEkgZG8gbm90IHRoaW5rIHdlIHVzZSBhCj4gcm13IGN5Y2xlIHdpdGggYW55 IHN1Y2ggbGF0Y2ggcmVnaXN0ZXJzLgo+Cj4gU3VnZ2VzdGVkLWJ5OiBEYW5pZWxlIENlcmFvbG8g U3B1cmlvIDxkYW5pZWxlLmNlcmFvbG9zcHVyaW9AaW50ZWwuY29tPgo+IFNpZ25lZC1vZmYtYnk6 IENocmlzIFdpbHNvbiA8Y2hyaXNAY2hyaXMtd2lsc29uLmNvLnVrPgo+IENjOiBEYW5pZWxlIENl cmFvbG8gU3B1cmlvIDxkYW5pZWxlLmNlcmFvbG9zcHVyaW9AaW50ZWwuY29tPgo+IENjOiBUdnJ0 a28gVXJzdWxpbiA8dHZydGtvLnVyc3VsaW5AaW50ZWwuY29tPgoKTXkgc3RhbmNlIHdhcyB0aGF0 IHdpdGggY2xlYXIgfjAsIHVzZXIgc2hvdWxkIGJlIG5vdGlmaWVkLgpCdXQgSSBndWVzcyBvbiB0 aGlzIGxldmVsIG9mIHRvb2xpbmcsIHlvdSBzaG91bGQgYmUgZnJlZQp0byBkbyB0aGUgdXNlbGVz cyByZWFkLgoKUmV2aWV3ZWQtYnk6IE1pa2EgS3VvcHBhbGEgPG1pa2Eua3VvcHBhbGFAbGludXgu aW50ZWwuY29tPgoKPiAtLS0KPiAgZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfdW5jb3JlLmgg fCAyMCArKysrKysrKysrLS0tLS0tLS0tLQo+ICAxIGZpbGUgY2hhbmdlZCwgMTAgaW5zZXJ0aW9u cygrKSwgMTAgZGVsZXRpb25zKC0pCj4KPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2k5 MTUvaW50ZWxfdW5jb3JlLmggYi9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF91bmNvcmUuaAo+ IGluZGV4IDQxNGZjMmNiMDQ1OS4uZGNmYTI0Mzg5MmM2IDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMv Z3B1L2RybS9pOTE1L2ludGVsX3VuY29yZS5oCj4gKysrIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUv aW50ZWxfdW5jb3JlLmgKPiBAQCAtMzc4LDIzICszNzgsMjMgQEAgaW50ZWxfdW5jb3JlX3JlYWQ2 NF8yeDMyKHN0cnVjdCBpbnRlbF91bmNvcmUgKnVuY29yZSwKPiAgc3RhdGljIGlubGluZSB2b2lk IGludGVsX3VuY29yZV9ybXcoc3RydWN0IGludGVsX3VuY29yZSAqdW5jb3JlLAo+ICAJCQkJICAg IGk5MTVfcmVnX3QgcmVnLCB1MzIgY2xlYXIsIHUzMiBzZXQpCj4gIHsKPiAtCXUzMiB2YWw7Cj4g Kwl1MzIgb2xkLCB2YWw7Cj4gIAo+IC0JdmFsID0gaW50ZWxfdW5jb3JlX3JlYWQodW5jb3JlLCBy ZWcpOwo+IC0JdmFsICY9IH5jbGVhcjsKPiAtCXZhbCB8PSBzZXQ7Cj4gLQlpbnRlbF91bmNvcmVf d3JpdGUodW5jb3JlLCByZWcsIHZhbCk7Cj4gKwlvbGQgPSBpbnRlbF91bmNvcmVfcmVhZCh1bmNv cmUsIHJlZyk7Cj4gKwl2YWwgPSAob2xkICYgfmNsZWFyKSB8IHNldDsKPiArCWlmICh2YWwgIT0g b2xkKQo+ICsJCWludGVsX3VuY29yZV93cml0ZSh1bmNvcmUsIHJlZywgdmFsKTsKPiAgfQo+ICAK PiAgc3RhdGljIGlubGluZSB2b2lkIGludGVsX3VuY29yZV9ybXdfZncoc3RydWN0IGludGVsX3Vu Y29yZSAqdW5jb3JlLAo+ICAJCQkJICAgICAgIGk5MTVfcmVnX3QgcmVnLCB1MzIgY2xlYXIsIHUz MiBzZXQpCj4gIHsKPiAtCXUzMiB2YWw7Cj4gKwl1MzIgb2xkLCB2YWw7Cj4gIAo+IC0JdmFsID0g aW50ZWxfdW5jb3JlX3JlYWRfZncodW5jb3JlLCByZWcpOwo+IC0JdmFsICY9IH5jbGVhcjsKPiAt CXZhbCB8PSBzZXQ7Cj4gLQlpbnRlbF91bmNvcmVfd3JpdGVfZncodW5jb3JlLCByZWcsIHZhbCk7 Cj4gKwlvbGQgPSBpbnRlbF91bmNvcmVfcmVhZF9mdyh1bmNvcmUsIHJlZyk7Cj4gKwl2YWwgPSAo b2xkICYgfmNsZWFyKSB8IHNldDsKPiArCWlmICh2YWwgIT0gb2xkKQo+ICsJCWludGVsX3VuY29y ZV93cml0ZV9mdyh1bmNvcmUsIHJlZywgdmFsKTsKPiAgfQo+ICAKPiAgc3RhdGljIGlubGluZSBp bnQgaW50ZWxfdW5jb3JlX3dyaXRlX2FuZF92ZXJpZnkoc3RydWN0IGludGVsX3VuY29yZSAqdW5j b3JlLAo+IC0tIAo+IDIuMjMuMAo+Cj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX18KPiBJbnRlbC1nZnggbWFpbGluZyBsaXN0Cj4gSW50ZWwtZ2Z4QGxpc3Rz LmZyZWVkZXNrdG9wLm9yZwo+IGh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4v bGlzdGluZm8vaW50ZWwtZ2Z4Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxpc3RzLmZyZWVkZXNr dG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lu dGVsLWdmeA==