From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH] drm/i915: RMW register cycles considered evil Date: Mon, 6 Jul 2015 17:00:43 +0200 Message-ID: <20150706150043.GQ2156@phenom.ffwll.local> References: <1436186522-7834-1-git-send-email-daniel.vetter@ffwll.ch> <20150706125049.GO5176@intel.com> <559A8B94.1050701@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail-wg0-f51.google.com (mail-wg0-f51.google.com [74.125.82.51]) by gabe.freedesktop.org (Postfix) with ESMTPS id 769596E0BF for ; Mon, 6 Jul 2015 07:57:57 -0700 (PDT) Received: by wguu7 with SMTP id u7so142970855wgu.3 for ; Mon, 06 Jul 2015 07:57:56 -0700 (PDT) Content-Disposition: inline In-Reply-To: <559A8B94.1050701@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Dave Gordon Cc: Daniel Vetter , Intel Graphics Development List-Id: intel-gfx@lists.freedesktop.org T24gTW9uLCBKdWwgMDYsIDIwMTUgYXQgMDM6MDc6MTZQTSArMDEwMCwgRGF2ZSBHb3Jkb24gd3Jv dGU6Cj4gT24gMDYvMDcvMTUgMTM6NTAsIFZpbGxlIFN5cmrDpGzDpCB3cm90ZToKPiA+T24gTW9u LCBKdWwgMDYsIDIwMTUgYXQgMDI6NDI6MDJQTSArMDIwMCwgRGFuaWVsIFZldHRlciB3cm90ZToK PiA+PkVzcGVjaWFsbHkgZm9yIHdvcmthcm91bmRzIHdoaWNoIGlzIHN0dWZmIHRoYXQncyBhbG1v c3QgaW1wb3NzaWJsZSB0bwo+ID4+dmVyaWZ5OiBUaGUgaW5pdGlhbCBzdGF0ZSBmcm9tIHRoZSBm aXJtd2FyZSBvbiBib290LXVwIGFuZCBhZnRlcgo+ID4+cmVzdW1lIGNvdWxkIGJlIGRpZmZlcmVu dCwgd2hpY2ggd2lsbCBoaWRlIGJ1Z3Mgd2hlbiB3ZSBkbyBhbiBSTVcKPiA+PmN5Y2xlLgo+ID4K PiA+SWYgeW91J3JlIHJlYWxseSB3b3JyaWVkIGFib3V0IHRoYXQgdGhlbiB3ZSBzaG91bGQgdGhl biBleHBsaWNpdGx5Cj4gPmluaXRpYWxpemUgYWxsIHRoZSByZWdpc3RlcnMgdGhhdCBtaWdodCBh ZmZlY3Qgc3R1ZmYuCj4gPgo+ID5Gb3IgYSBidW5jaCBvZiBHVCByZWdpc3RlcnMgd2UgY291bGQg anVzdCBkbyBhIEdQVSByZXNldCBhdCBkcml2ZXIKPiA+aW5pdC4gVGhhdCB0aGF0IHdvbid0IGhl bHAgd2l0aCBVQ0dDVEwgYW5kIHN1Y2guCj4gPgo+ID5JJ20gYWxzbyB3b3JyaWVkIHRoYXQgaWYg d2UgZG9uJ3QgdXNlIFJNV3MgZm9yIGVhcmx5IHBhcnRzLCB0aGUgaGFyZHdhcmUKPiA+Zm9sa3Mg bWF5IHN0aWxsIGNoYW5nZSB0aGUgZGVmYXVsdCBmb3Igc29tZSBvZmh0ZSBvdGhlciBiaXRzLCBh bmQgdGhlbgo+ID53ZSBlbmQgdXAgY2xvYmJlcmluZyB0aG9zZS4KPiAKPiBJbiBvdGhlciBkcml2 ZXJzLCBJJ3ZlIGZvdW5kIGEgZ29vZCBwYXR0ZXJuIHRvIGJlOgo+IAo+IDEuCWR1cmluZyBkcml2 ZXIgbG9hZCwgc25hcHNob3QgKGp1c3Qgb25jZSkgYW55dGhpbmcgdGhhdCB0aGUgQklPUwo+IAlt YXkgaGF2ZSBwcm9ncmFtbWVkIHRoYXQgd2UgbWF5IG5lZWQgbGF0ZXIKPiAyLgl0aGVuIHJlc2V0 IHRoZSBoL3cgYW5kIHJlcHJvZ3JhbSBpdCB0b3RhbGx5IHRvIG91ciBwcmVmZXJyZWQKPiAJdmFs dWVzLCB3aGljaCBtYXkgdG8gYSBncmVhdGVyIG9yIGxlc3NlciBkZWdyZWUgYmUgZGVyaXZlZCBm cm9tCj4gCXRoZSBzYXZlZCBCSU9TIHNldHRpbmdzCj4gMy4JZHVyaW5nIHVubG9hZCwgcmVzZXQg dGhlIGgvdyBhZ2FpbiBhbmQgcmVwcm9ncmFtIGl0IHdpdGggdGhlCj4gCUJJT1Mgc2V0dGluZ3MK PiAKPiAyYS4JcmVzdW1lIGlzIGp1c3QgbGlrZSBsb2FkLCBleGNlcHQgd2UgZG9uJ3QgbmVlZCBv ciB3YW50IHRvCj4gCWNhcHR1cmUgdGhlIEJJT1Mgc2V0dGluZ3MgZmlyc3QKPiAzYS4Jc3VzcGVu ZCBpcyBsaWtlIHVubG9hZCwgZXhjZXB0IGluIHNvbWUgY2FzZXMgdGhlIEJJT1MgdmFsdWVzCj4g CW1pZ2h0IG5lZWQgdG8gYmUgdHdlYWtlZCB3aGVuIHdyaXRpbmcgdGhlbSBiYWNrIGluIG9yZGVy IHRvCj4gCWVuc3VyZSB0aGUgZGV2aWNlIGRvZXNuJ3QgZ2VuZXJhdGUgZnVydGhlciBhY3Rpdml0 eS4KPiAKPiBTdGVwIDEgZW5zdXJlcyB0aGF0IHdlIGRvbid0IGxvc2UgdXNlZnVsIHNldHRpbmdz IHdoZXJlIHRoZSBCSU9TIGtub3dzCj4gYmV0dGVyIHRoYW4gdGhlIGRyaXZlciB3aGF0IHRoZSBn b29kIHZhbHVlcyBhcmUuCj4gU3RlcCAyLzJhLiBlbnN1cmVzIHRoYXQgdGhlIGRldmljZSBzdGFy dHMgb3V0IGluIGEgd2VsbC1kZWZpbmVkIHN0YXRlLAo+IHJlZ2FyZGxlc3Mgb2YgaG93IGNvbXBy ZWhlbnNpdmVseSAob3IgYmFkbHkpIHRoZSBCSU9TIGhhcyBzZXQgaXQgdXAuCj4gSXQgc2VlbXMg YSByZWFzb25hYmxlIGNvbXByb21pc2UgYmV0d2VlbiB0YWtpbmcgYWR2YW50YWdlIG9mIGdvb2Qg QklPU2VzCj4gd2hpbGUgbm90IGdldHRpbmcgdG9vIG11Y2ggaGFzc2xlIGZyb20gYnJva2VuIG9u ZXMuCgpXZSd2ZSBoYWQgbGFyZ2Utc2NhbGUgc2F2ZS9yZXN0b3JlIGhvb2tzIGFuZCB0aGV5J3Jl IGFub3RoZXIga2luZCBvZgp0cm91YmxlOiBJdCB1c3VhbGx5IG1lYW5zIHlvdSBlbmQgdXAgZHVw bGljYXRpbmcgYmV0d2VlbiBob3cgeW91IHRvdWNoCnJlZ2lzdGVycyBhdCBydW50aW1lIGFuZCB0 aGUgZ2lhbnQgcmVzdW1lIGNvZGUuIEFuZCB0aGVyZSdzIGFsd2F5cyBnb2luZwp0byBiZSBzb21l IG92ZXJsYXAgKG91ciBodyBlbmdpbmVlcnMgYXJlIGNyZWF0aXZlIGVub3VnaCBmb3IgdGhhdCkg d2hpY2gKbWVhbnMgaWYgdGhlcmUncyBzdWJ0bGUgb3JkZXJpbmcgcnVsZXMgdGhvc2UgdHdvIHBh dGhzIGluZXZpdGFibHkgd2lsbApkaXZlcmdlLgotRGFuaWVsCi0tIApEYW5pZWwgVmV0dGVyClNv ZnR3YXJlIEVuZ2luZWVyLCBJbnRlbCBDb3Jwb3JhdGlvbgpodHRwOi8vYmxvZy5mZndsbC5jaApf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpJbnRlbC1nZngg bWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cDovL2xpc3Rz LmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVsLWdmeAo=