From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Subject: Re: [RFC PATCH] pci: prevent putting pcie devices into lower device states on certain intel bridges Date: Tue, 1 Oct 2019 14:34:27 -0500 Message-ID: <20191001193427.GA59137@google.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Karol Herbst Cc: Linux PM , nouveau , "Rafael J. Wysocki" , LKML , dri-devel , Linux PCI , Mika Westerberg List-Id: dri-devel@lists.freedesktop.org T24gVHVlLCBPY3QgMDEsIDIwMTkgYXQgMDY6MjE6MjhQTSArMDIwMCwgS2Fyb2wgSGVyYnN0IHdy b3RlOgo+IE9uIFR1ZSwgT2N0IDEsIDIwMTkgYXQgMzoyNyBQTSBCam9ybiBIZWxnYWFzIDxoZWxn YWFzQGtlcm5lbC5vcmc+IHdyb3RlOgo+ID4gT24gTW9uLCBTZXAgMzAsIDIwMTkgYXQgMDY6MzY6 MTJQTSArMDIwMCwgS2Fyb2wgSGVyYnN0IHdyb3RlOgo+ID4gPiBPbiBNb24sIFNlcCAzMCwgMjAx OSBhdCA2OjMwIFBNIE1pa2EgV2VzdGVyYmVyZwo+ID4gPiA8bWlrYS53ZXN0ZXJiZXJnQGxpbnV4 LmludGVsLmNvbT4gd3JvdGU6Cj4gPiA+ID4KPiA+ID4gPiBPbiBNb24sIFNlcCAzMCwgMjAxOSBh dCAwNjowNToxNFBNICswMjAwLCBLYXJvbCBIZXJic3Qgd3JvdGU6Cj4gPiA+ID4gPiBzdGlsbCBo YXBwZW5zIHdpdGggeW91ciBwYXRjaCBhcHBsaWVkLiBUaGUgbWFjaGluZSBzaW1wbHkgZ2V0cyBz aHV0IGRvd24uCj4gPiA+ID4gPgo+ID4gPiA+ID4gZG1lc2cgY2FuIGJlIGZvdW5kIGhlcmU6Cj4g PiA+ID4gPiBodHRwczovL2dpc3QuZ2l0aHVidXNlcmNvbnRlbnQuY29tL2thcm9saGVyYnN0LzQw ZWIwOTFjN2I3YjMzZWY5OTM1MjVkZTY2MGYxYTNiL3Jhdy8yMzgwZTMxZjU2NmU5M2U1YmE3Yzg3 ZWY1NDU0MjA5NjVkNGM0OTJjL2dpc3RmaWxlMS50eHQKPiA+ID4gPgo+ID4gPiA+IExvb2tpbmcg eW91ciBkbWVzZzoKPiA+ID4gPgo+ID4gPiA+IFNlcCAzMCAxNzoyNDoyNyBrZXJuZWw6IG5vdXZl YXUgMDAwMDowMTowMC4wOiBEUk06IERDQiB2ZXJzaW9uIDQuMQo+ID4gPiA+IFNlcCAzMCAxNzoy NDoyNyBrZXJuZWw6IG5vdXZlYXUgMDAwMDowMTowMC4wOiBEUk06IE1NOiB1c2luZyBDT1BZIGZv ciBidWZmZXIgY29waWVzCj4gPiA+ID4gU2VwIDMwIDE3OjI0OjI3IGtlcm5lbDogW2RybV0gSW5p dGlhbGl6ZWQgbm91dmVhdSAxLjMuMSAyMDEyMDgwMSBmb3IgMDAwMDowMTowMC4wIG9uIG1pbm9y IDEKPiA+ID4gPgo+ID4gPiA+IEkgd291bGQgYXNzdW1lIGl0IHJ1bnRpbWUgc3VzcGVuZHMgaGVy ZS4gVGhlbiBpdCB3YWtlcyB1cCBiZWNhdXNlIG9mIFBDSQo+ID4gPiA+IGFjY2VzcyBmcm9tIHVz ZXJzcGFjZToKPiA+ID4gPgo+ID4gPiA+IFNlcCAzMCAxNzoyNDo0MiBrZXJuZWw6IHBjaV9yYXdf c2V0X3Bvd2VyX3N0YXRlOiA1NiBjYWxsYmFja3Mgc3VwcHJlc3NlZAo+ID4gPiA+Cj4gPiA+ID4g YW5kIGZvciBzb21lIHJlYXNvbiBpdCBkb2VzIG5vdCBnZXQgcmVzdW1lZCBwcm9wZXJseS4gVGhl cmUgYXJlIGFsc28gZmV3Cj4gPiA+ID4gd2FybmluZ3MgZnJvbSBBQ1BJIHRoYXQgbWlnaHQgYmUg cmVsZXZhbnQ6Cj4gPiA+ID4KPiA+ID4gPiBTZXAgMzAgMTc6MjQ6Mjcga2VybmVsOiBBQ1BJIFdh cm5pbmc6IFxfU0IuUENJMC5HRlgwLl9EU006IEFyZ3VtZW50ICM0IHR5cGUgbWlzbWF0Y2ggLSBG b3VuZCBbQnVmZmVyXSwgQUNQSSByZXF1aXJlcyBbUGFja2FnZV0gKDIwMTkwNTA5L25zYXJndW1l bnRzLTU5KQo+ID4gPiA+IFNlcCAzMCAxNzoyNDoyNyBrZXJuZWw6IEFDUEkgV2FybmluZzogXF9T Qi5QQ0kwLlBFRzAuUEVHUC5fRFNNOiBBcmd1bWVudCAjNCB0eXBlIG1pc21hdGNoIC0gRm91bmQg W0J1ZmZlcl0sIEFDUEkgcmVxdWlyZXMgW1BhY2thZ2VdICgyMDE5MDUwOS9uc2FyZ3VtZW50cy01 OSkKPiA+ID4KPiA+ID4gYWZhaWsgdGhpcyBpcyB0aGUgY2FzZSBmb3IgZXNzZW50aWFsbHkgZXZl cnkgbGFwdG9wIG91dCB0aGVyZS4KPiA+Cj4gPiBJIHRoaW5rIHdlIHNob3VsZCBsb29rIGludG8g dGhpcyBhIGxpdHRsZSBiaXQuCj4gPiBhY3BpX25zX2NoZWNrX2FyZ3VtZW50X3R5cGVzKCkgY2hl Y2tzIHRoZSBhcmd1bWVudCB0eXBlIGFuZCBwcmludHMKPiA+IHRoaXMgbWVzc2FnZSwgYnV0IEFG QUlDVCBpdCBkb2Vzbid0IGFjdHVhbGx5IGZpeCBhbnl0aGluZyBvciBwcmV2ZW50Cj4gPiBleGVj dXRpb24gb2YgdGhlIG1ldGhvZCwgc28gSSBoYXZlIG5vIGlkZWEgd2hhdCBoYXBwZW5zIHdoZW4g d2UKPiA+IGFjdHVhbGx5IGV4ZWN1dGUgdGhlIF9EU00uCj4gCj4gSSBjYW4gYXNzdXJlIHlvdSB0 aGF0IHRoaXMgd2FybmluZyBoYXBwZW5zIG9uIGV2ZXJ5IHNpbmdsZSBsYXB0b3Agb3V0Cj4gdGhl cmUgd2l0aCBkdWFsIE52aWRpYSBncmFwaGljcyBhbmQgaXQncyBlc3NlbnRpYWxseSBqdXN0IGEg ZmlybXdhcmUKPiBidWcuIEFuZCBpdCBuZXZlciBjYXVzZWQgYW55IGlzc3VlcyBvbiBhbnkgb2Yg dGhlIG9sZGVyIGxhcHRvcHMgKG9yCj4gbmV3ZXN0IG9uZSBmb3IgdGhhdCBtYXR0ZXIpLgoKUmFm YWVsLCBkbyB5b3Uga25vdyBhbnl0aGluZyBhYm91dCB0aGlzPyAgSWYgQUNQSSBoYXMgc29tZSBz b3J0IG9mCndvcmthcm91bmQgc28gaXQgY2FuIGV4ZWN1dGUgdGhlIG1ldGhvZCBjb3JyZWN0bHkg YW55d2F5LCBtYXliZSB3ZQpzaG91bGQgcmVtb3ZlIG9yIHJld29yZCB0aGUgd2FybmluZz8KCk9y IGlmIHRoaXMgZG9lcyBwcmV2ZW50IGV4ZWN1dGlvbiBvZiB0aGUgbWV0aG9kLCBtYXliZSB3ZSBu ZWVkIHRvIGFkZAphIHdvcmthcm91bmQgc2luY2UgdGhlIHByb2JsZW0gaXMgc28gcHJldmFsZW50 IGluIHRoZSBmaWVsZD8KCj4gPiBJZiB3ZSBleGVjdXRlIHRoaXMgX0RTTSBhcyBwYXJ0IG9mIHBv d2VyIG1hbmFnZW1lbnQsIGFuZCB0aGUgX0RTTQo+ID4gZG9lc24ndCB3b3JrIHJpZ2h0LCBpdCB3 b3VsZCBiZSBubyBzdXJwcmlzZSB0aGF0IHdlIGhhdmUgcHJvYmxlbXMuCj4gPgo+ID4gTWF5YmUg d2UgY291bGQgbGVhcm4gc29tZXRoaW5nIGJ5IHR1cm5pbmcgb24gQUNQSV9EQl9QQVJTRSBvdXRw dXQgKHNlZQo+ID4gRG9jdW1lbnRhdGlvbi9maXJtd2FyZS1ndWlkZS9hY3BpL2RlYnVnLnJzdCku Cj4gPgo+ID4gWW91IG11c3QgaGF2ZSBhbiBhY3BpZHVtcCBhbHJlYWR5IGZyb20gYWxsIHlvdXIg aW52ZXN0aWdhdGlvbi4gIENhbgo+ID4geW91IHB1dCBpdCBzb21ld2hlcmUsIGUuZy4sIGJ1Z3pp bGxhLmtlcm5lbC5vcmcsIGFuZCBpbmNsdWRlIGEgVVJMPwo+IAo+IFdpbGwgZG8gc28gbGF0ZXIs IHJpZ2h0IG5vdyBJIGFtIHRyYXZlbGluZyB0byBYREMgYW5kIHdpbGwgaGF2ZSBtb3JlCj4gdGlt ZSBmb3IgdGhhdCB0aGVuLgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3Rv cC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmkt ZGV2ZWw=