From mboxrd@z Thu Jan 1 00:00:00 1970 From: Imre Deak Subject: Re: [PATCH 1/2] drm/i915: fix race when clearing RPS IIR bits Date: Tue, 24 Mar 2015 22:52:32 +0200 Message-ID: <1427230352.3400.67.camel@ideak-mobl> References: <1427130695-5705-1-git-send-email-imre.deak@intel.com> <20150323211015.GA4586@nuc-i3427.alporthouse.com> <20150324091403.GC1349@phenom.ffwll.local> <20150324092410.GB4586@nuc-i3427.alporthouse.com> Reply-To: imre.deak@intel.com Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id EE48E6E77F for ; Tue, 24 Mar 2015 13:52:35 -0700 (PDT) In-Reply-To: <20150324092410.GB4586@nuc-i3427.alporthouse.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Chris Wilson Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org T24gVHVlLCAyMDE1LTAzLTI0IGF0IDA5OjI0ICswMDAwLCBDaHJpcyBXaWxzb24gd3JvdGU6Cj4g T24gVHVlLCBNYXIgMjQsIDIwMTUgYXQgMTA6MTQ6MDNBTSArMDEwMCwgRGFuaWVsIFZldHRlciB3 cm90ZToKPiA+IE9uIE1vbiwgTWFyIDIzLCAyMDE1IGF0IDA5OjEwOjE1UE0gKzAwMDAsIENocmlz IFdpbHNvbiB3cm90ZToKPiA+ID4gT24gTW9uLCBNYXIgMjMsIDIwMTUgYXQgMDc6MTE6MzRQTSAr MDIwMCwgSW1yZSBEZWFrIHdyb3RlOgo+ID4gPiA+IFdoZW4gZGlzYWJsaW5nIFJQUyBpbnRlcnJ1 cHRzIHRoZXJlIGlzIGEgcmFjZSB3aGVyZSB3ZSBkaXNhYmxlIFJQUwo+ID4gPiA+IGluZXJydXB0 cyB3aGlsZSB0aGUgaW50ZXJydXB0IGhhbmRsZXIgaXMgcnVubmluZyBhbmQgdGhlIGhhbmRsZXIg aGFzCj4gPiA+ID4gYWxyZWFkeSBsYXRjaGVkIHRoZSBwZW5kaW5nIFJQUyBpbnRlcnJ1cHQgZnJv bSB0aGUgbWFzdGVyIElJUiByZWdpc3Rlci4KPiA+ID4gPiBBZnRlcndhcmRzIHRoZSBkaXNhYmxp bmcgcGF0aCBjbGVhcnMgdGhlIFBNIElJUiBiaXRzLCBtYWtpbmcgdGhlIHN0YXRlCj4gPiA+ID4g b2YgcGVuZGluZyBpbnRlcnJ1cHRzIGluY29uc2lzdGVudCBmcm9tIHRoZSBpbnRlcnJ1cHQgaGFu ZGxlcidzIHBvaW50IG9mCj4gPiA+ID4gdmlldy4gVGhpcyB0cmlnZ2VycyB0aGUgZm9sbG93aW5n IHdhcm5pbmc6ICJUaGUgbWFzdGVyIGNvbnRyb2wgaW50ZXJydXB0Cj4gPiA+ID4gbGllZCAoUE0p ISIuCj4gPiA+ID4gCj4gPiA+ID4gVG8gZml4IHRoaXMgbWFrZSBzdXJlIHRoYXQgYW55IHJ1bm5p bmcgaW50ZXJydXB0IGhhbmRsZXIgKHdoaWNoIG1heQo+ID4gPiA+IGhhdmUgYWxyZWFkeSBsYXRj aGVkIHRoZSBtYXN0ZXIgSUlSKSBmaW5pc2hlcyBiZWZvcmUgY2xlYXJpbmcgdGhlIElJUgo+ID4g PiA+IGJpdHMuCj4gPiA+ID4gCj4gPiA+IAo+ID4gPiBJc24ndCB0aGlzIG92ZXJraWxsIGZvciB3 aGF0IGlzIGp1c3QgYSBib2d1cyBXQVJOPyBJZiB0aGUgV0FSTiBpcyBhCj4gPiA+IGxvZ2ljYWwg Y29uc2VxdWVuY2Ugb2YgdGhlIGNvZGUsIGxldCdzIGp1c3QgcmVtb3ZlIHRoZSBXQVJOLgo+ID4g PiAKPiA+ID4gT3IgaW93IGNhbiB5b3Ugbm90IGZpbmQgYSBjaGVhcGVyIHdheSB0byBmaXggdGhp cz8KPiA+IAo+ID4gV2Ugb25seSBydW4gdGhpcyBvbiBzdXNwZW5kL3Jlc3VtZSBhZmFpaywgb3Zl cmhlYWQgc2hvdWxkIGJlIGFjY2VwdGFibGUuCj4gPiBBbmQgd2UndmUgaGFkIHRoYXQgbXVjaCBv dmVyaGVhZCBiZWZvcmUgd2UndmUgZG9uZSBhbGwgdGhlIHJ1bnRpbWUgcG0KPiA+IHVuaWZpY2F0 aW9uLCBpdCdzIHN0aWxsIGxlc3Mgc3luY2hyb25pemF0aW9uIHRoYW4gZGlzYWJsaW5nIGludGVy cnVwdHMKPiA+IGNvbXBsZXRlbHkuCj4gCj4gSG1tLCBJIHRob3VnaHQgdGhpcyB3YXMgaW4gY29u anVuY3Rpb24gd2l0aCBSUFMgcG0gbWFza2luZyAoaS5lLiBmaXJlZAo+IGV2ZXJ5dGltZSB3ZSBu byBsb25nZXIgZXhwZWN0IHRvIHJlY2VpdmUgUlBTIGludGVycnVwdHMpLgoKWWVzLCBpdCBhZmZl Y3RzIG9ubHkgdGhlIGRyaXZlciBsb2FkaW5nICh3aGVyZSBpdCdzIGEgbm9wKSBhbmQgdGhlCnJ1 bnRpbWUvc3lzdGVtIHN1c3BlbmQgcGF0aC4KCj4gSWYgaXQgaXMgb25seSB0aGUgaW5mcmVxdWVu dCwgdGhlbiB5ZWFoIEkgY2FuJ3QgY29tcGxhaW4gdG9vIG11Y2ggLSBJCj4gc3RpbGwgdGhpbmsg aXQgaXMgc2xpZ2h0bHkgZmlzaHksIGJ1dCBJIGNhbiBhY2NlcHQgdGhhdCBpdCBpcyBqdXN0IGEK PiBxdWlyayBvZiB0aGUgYnVmZmVyaW5nIHRoZSBpbnRlcnJ1cHQgZG9lcy4KClRoZSByZWFzb24g Zm9yIHN5bmNfaXJxIGlzIHRvIHByZXZlbnQgYW55IHN1YnNlcXVlbnQKZ2VuNl9lbmFibGVfcnBz X2ludGVycnVwdHMoKSBjYWxsIHRvIHRyaWdnZXIgc3B1cmlvdXMgaW50ZXJydXB0cy4KV2l0aG91 dCBpdCB3ZSBjb3VsZCBoYXZlOgoKQ1BVIDAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg Q1BVIDEKZ2VuOF9ndF9pcnFfaGFuZGxlcigpCnRtcCA9IEk5MTVfUkVBRChHRU44X0dUX0lJUigy KSkKPHRtcCBoYXMgcGVuZGluZyBSUFMgYml0cz4KICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgZ2VuNl9kaXNhYmxlX3Jwc19pbnRlcnJ1cHRzKCkKICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgZ2VuNl9yZXNldF9ycHNfaW50ZXJydXB0cygpCiAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgIDxjbGVhciBHRU44X0dUX0lJUigyKT4KICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgZ2VuNl9lbmFibGVfcnBzX2ludGVycnVwdHMoKQog ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAKZ2VuNl9ycHNfaXJxX2hhbmRsZXIodG1w KQo8aGFuZGxlIHRoZSBub3cgc3RhbGUgUlBTIGV2ZW50cz4KCk5vdyBJIGFkbWl0IHRoZSBhYm92 ZSBpcyBxdWl0ZSB1bmxpa2VseSwgb3IgZXZlbiBpbXBvc3NpYmxlIGR1ZSB0byB3aGF0CmhhcHBl bnMgYmV0d2VlbiBnZW42X2Rpc2FibGVfcnBzX2ludGVycnVwdHMoKSBhbmQKZ2VuNl9lbmFibGVf cnBzX2ludGVycnVwdHMoKSBpbiBvdXIgY29kZSBhdG0uIEkgc3RpbGwgdGhvdWdodCBpdCdzIHNh ZmVyCm5vdCB0byByZWx5IG9uIHRob3NlLgoKT25lIGFsdGVybmF0aXZlIHdvdWxkIGhhdmUgYmVl biB0byBleHRlbmQgdGhlIGlycV9sb2NrIGluIHRoZSBpbnRlcnJ1cHQKaGFuZGxlciwgc28gdGhh dCB3ZSByZWFkIEdFTjhfR1RfSUlSKDIpIGFuZCBoYW5kbGUgYW55IGV2ZW50cyBpbiBpdCBpbgpv bmUgY3JpdGljYWwgc2VjdGlvbiwgYnV0IHRoYXQgd291bGQgYWRkIHRoZSBvdmVyaGVhZCB3aGVy ZSBpdCBhY3R1YWxseQptYXR0ZXJzLgoKLS1JbXJlCgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhA bGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1h bi9saXN0aW5mby9pbnRlbC1nZngK