From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2130.oracle.com (userp2130.oracle.com. [156.151.31.86]) by gmr-mx.google.com with ESMTPS id q15si722157pfs.1.2020.12.11.06.29.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Dec 2020 06:29:45 -0800 (PST) Subject: Re: [patch 27/30] xen/events: Only force affinity mask for percpu interrupts References: <20201210192536.118432146@linutronix.de> <20201210194045.250321315@linutronix.de> <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> <2164a0ce-0e0d-c7dc-ac97-87c8f384ad82@suse.com> <871rfwiknd.fsf@nanos.tec.linutronix.de> From: boris.ostrovsky@oracle.com Message-ID: <9806692f-24a3-4b6f-ae55-86bd66481271@oracle.com> Date: Fri, 11 Dec 2020 09:29:09 -0500 MIME-Version: 1.0 In-Reply-To: <871rfwiknd.fsf@nanos.tec.linutronix.de> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Content-Language: en-US To: Thomas Gleixner , =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , LKML Cc: Peter Zijlstra , Marc Zyngier , Stefano Stabellini , xen-devel@lists.xenproject.org, "James E.J. Bottomley" , Helge Deller , afzal mohammed , linux-parisc@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Mark Rutland , Catalin Marinas , Will Deacon , Christian Borntraeger , Heiko Carstens , linux-s390@vger.kernel.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Pankaj Bharadiya , Chris Wilson , Wambui Karuga , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Tvrtko Ursulin , Linus Walleij , linux-gpio@vger.kernel.org, Lee Jones , Jon Mason , Dave Jiang , Allen Hubbe , linux-ntb@googlegroups.com, Lorenzo Pieralisi , Rob Herring , Bjorn Helgaas , Michal Simek , linux-pci@vger.kernel.org, Karthikeyan Mitran , Hou Zhiqiang , Tariq Toukan , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, Saeed Mahameed , Leon Romanovsky List-ID: On 12/11/20 7:37 AM, Thomas Gleixner wrote: > On Fri, Dec 11 2020 at 13:10, Jürgen Groß wrote: >> On 11.12.20 00:20, boris.ostrovsky@oracle.com wrote: >>> On 12/10/20 2:26 PM, Thomas Gleixner wrote: >>>> All event channel setups bind the interrupt on CPU0 or the target CPU for >>>> percpu interrupts and overwrite the affinity mask with the corresponding >>>> cpumask. That does not make sense. >>>> >>>> The XEN implementation of irqchip::irq_set_affinity() already picks a >>>> single target CPU out of the affinity mask and the actual target is stored >>>> in the effective CPU mask, so destroying the user chosen affinity mask >>>> which might contain more than one CPU is wrong. >>>> >>>> Change the implementation so that the channel is bound to CPU0 at the XEN >>>> level and leave the affinity mask alone. At startup of the interrupt >>>> affinity will be assigned out of the affinity mask and the XEN binding will >>>> be updated. >>> >>> If that's the case then I wonder whether we need this call at all and instead bind at startup time. >> After some discussion with Thomas on IRC and xen-devel archaeology the >> result is: this will be needed especially for systems running on a >> single vcpu (e.g. small guests), as the .irq_set_affinity() callback >> won't be called in this case when starting the irq. On UP are we not then going to end up with an empty affinity mask? Or are we guaranteed to have it set to 1 by interrupt generic code? This is actually why I brought this up in the first place --- a potential mismatch between the affinity mask and Xen-specific data (e.g. info->cpu and then protocol-specific data in event channel code). Even if they are re-synchronized later, at startup time (for SMP). I don't see anything that would cause a problem right now but I worry that this inconsistency may come up at some point. -boris > That's right, but not limited to ARM. The same problem exists on x86 UP. > So yes, the call makes sense, but the changelog is not really useful. > Let me add a comment to this. > > Thanks, > > tglx > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CAC5C433FE for ; Fri, 11 Dec 2020 20:36:38 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 11B6F2405C for ; Fri, 11 Dec 2020 20:36:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 11B6F2405C Authentication-Results: mail.kernel.org; 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Fri, 11 Dec 2020 14:29:20 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 358kstfcjw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 11 Dec 2020 14:29:20 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0BBETD7i006093; Fri, 11 Dec 2020 14:29:13 GMT Received: from [10.39.222.144] (/10.39.222.144) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 11 Dec 2020 06:29:13 -0800 To: Thomas Gleixner , =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , LKML References: <20201210192536.118432146@linutronix.de> <20201210194045.250321315@linutronix.de> <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> <2164a0ce-0e0d-c7dc-ac97-87c8f384ad82@suse.com> <871rfwiknd.fsf@nanos.tec.linutronix.de> From: boris.ostrovsky@oracle.com Organization: Oracle Corporation Message-ID: <9806692f-24a3-4b6f-ae55-86bd66481271@oracle.com> Date: Fri, 11 Dec 2020 09:29:09 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 In-Reply-To: <871rfwiknd.fsf@nanos.tec.linutronix.de> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9831 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 suspectscore=0 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012110094 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9831 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 clxscore=1015 malwarescore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012110093 X-Mailman-Approved-At: Fri, 11 Dec 2020 22:52:39 +0000 Subject: Re: [Intel-gfx] [patch 27/30] xen/events: Only force affinity mask for percpu interrupts X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Karthikeyan Mitran , Peter Zijlstra , Catalin Marinas , Linus Walleij , dri-devel@lists.freedesktop.org, Chris Wilson , "James E.J. Bottomley" , Saeed Mahameed , netdev@vger.kernel.org, Jakub Kicinski , Will Deacon , Michal Simek , linux-s390@vger.kernel.org, afzal mohammed , Stefano Stabellini , Dave Jiang , Leon Romanovsky , linux-rdma@vger.kernel.org, Marc Zyngier , Helge Deller , Russell King , Christian Borntraeger , linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Heiko Carstens , Wambui Karuga , Allen Hubbe , Rob Herring , David Airlie , linux-gpio@vger.kernel.org, Lorenzo Pieralisi , Bjorn Helgaas , Lee Jones , linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, Hou Zhiqiang , Tariq Toukan , Jon Mason , linux-ntb@googlegroups.com, intel-gfx@lists.freedesktop.org, "David S. Miller" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Ck9uIDEyLzExLzIwIDc6MzcgQU0sIFRob21hcyBHbGVpeG5lciB3cm90ZToKPiBPbiBGcmksIERl YyAxMSAyMDIwIGF0IDEzOjEwLCBKw7xyZ2VuIEdyb8OfIHdyb3RlOgo+PiBPbiAxMS4xMi4yMCAw MDoyMCwgYm9yaXMub3N0cm92c2t5QG9yYWNsZS5jb20gd3JvdGU6Cj4+PiBPbiAxMi8xMC8yMCAy OjI2IFBNLCBUaG9tYXMgR2xlaXhuZXIgd3JvdGU6Cj4+Pj4gQWxsIGV2ZW50IGNoYW5uZWwgc2V0 dXBzIGJpbmQgdGhlIGludGVycnVwdCBvbiBDUFUwIG9yIHRoZSB0YXJnZXQgQ1BVIGZvcgo+Pj4+ IHBlcmNwdSBpbnRlcnJ1cHRzIGFuZCBvdmVyd3JpdGUgdGhlIGFmZmluaXR5IG1hc2sgd2l0aCB0 aGUgY29ycmVzcG9uZGluZwo+Pj4+IGNwdW1hc2suIFRoYXQgZG9lcyBub3QgbWFrZSBzZW5zZS4K Pj4+Pgo+Pj4+IFRoZSBYRU4gaW1wbGVtZW50YXRpb24gb2YgaXJxY2hpcDo6aXJxX3NldF9hZmZp bml0eSgpIGFscmVhZHkgcGlja3MgYQo+Pj4+IHNpbmdsZSB0YXJnZXQgQ1BVIG91dCBvZiB0aGUg YWZmaW5pdHkgbWFzayBhbmQgdGhlIGFjdHVhbCB0YXJnZXQgaXMgc3RvcmVkCj4+Pj4gaW4gdGhl IGVmZmVjdGl2ZSBDUFUgbWFzaywgc28gZGVzdHJveWluZyB0aGUgdXNlciBjaG9zZW4gYWZmaW5p dHkgbWFzawo+Pj4+IHdoaWNoIG1pZ2h0IGNvbnRhaW4gbW9yZSB0aGFuIG9uZSBDUFUgaXMgd3Jv bmcuCj4+Pj4KPj4+PiBDaGFuZ2UgdGhlIGltcGxlbWVudGF0aW9uIHNvIHRoYXQgdGhlIGNoYW5u ZWwgaXMgYm91bmQgdG8gQ1BVMCBhdCB0aGUgWEVOCj4+Pj4gbGV2ZWwgYW5kIGxlYXZlIHRoZSBh ZmZpbml0eSBtYXNrIGFsb25lLiBBdCBzdGFydHVwIG9mIHRoZSBpbnRlcnJ1cHQKPj4+PiBhZmZp bml0eSB3aWxsIGJlIGFzc2lnbmVkIG91dCBvZiB0aGUgYWZmaW5pdHkgbWFzayBhbmQgdGhlIFhF TiBiaW5kaW5nIHdpbGwKPj4+PiBiZSB1cGRhdGVkLgo+Pj4KPj4+IElmIHRoYXQncyB0aGUgY2Fz ZSB0aGVuIEkgd29uZGVyIHdoZXRoZXIgd2UgbmVlZCB0aGlzIGNhbGwgYXQgYWxsIGFuZCBpbnN0 ZWFkIGJpbmQgYXQgc3RhcnR1cCB0aW1lLgo+PiBBZnRlciBzb21lIGRpc2N1c3Npb24gd2l0aCBU aG9tYXMgb24gSVJDIGFuZCB4ZW4tZGV2ZWwgYXJjaGFlb2xvZ3kgdGhlCj4+IHJlc3VsdCBpczog dGhpcyB3aWxsIGJlIG5lZWRlZCBlc3BlY2lhbGx5IGZvciBzeXN0ZW1zIHJ1bm5pbmcgb24gYQo+ PiBzaW5nbGUgdmNwdSAoZS5nLiBzbWFsbCBndWVzdHMpLCBhcyB0aGUgLmlycV9zZXRfYWZmaW5p dHkoKSBjYWxsYmFjawo+PiB3b24ndCBiZSBjYWxsZWQgaW4gdGhpcyBjYXNlIHdoZW4gc3RhcnRp bmcgdGhlIGlycS4KCgpPbiBVUCBhcmUgd2Ugbm90IHRoZW4gZ29pbmcgdG8gZW5kIHVwIHdpdGgg YW4gZW1wdHkgYWZmaW5pdHkgbWFzaz8gT3IgYXJlIHdlIGd1YXJhbnRlZWQgdG8gaGF2ZSBpdCBz ZXQgdG8gMSBieSBpbnRlcnJ1cHQgZ2VuZXJpYyBjb2RlPwoKClRoaXMgaXMgYWN0dWFsbHkgd2h5 IEkgYnJvdWdodCB0aGlzIHVwIGluIHRoZSBmaXJzdCBwbGFjZSAtLS0gYSBwb3RlbnRpYWwgbWlz bWF0Y2ggYmV0d2VlbiB0aGUgYWZmaW5pdHkgbWFzayBhbmQgWGVuLXNwZWNpZmljIGRhdGEgKGUu Zy4gaW5mby0+Y3B1IGFuZCB0aGVuIHByb3RvY29sLXNwZWNpZmljIGRhdGEgaW4gZXZlbnQgY2hh bm5lbCBjb2RlKS4gRXZlbiBpZiB0aGV5IGFyZSByZS1zeW5jaHJvbml6ZWQgbGF0ZXIsIGF0IHN0 YXJ0dXAgdGltZSAoZm9yIFNNUCkuCgoKSSBkb24ndCBzZWUgYW55dGhpbmcgdGhhdCB3b3VsZCBj YXVzZSBhIHByb2JsZW0gcmlnaHQgbm93IGJ1dCBJIHdvcnJ5IHRoYXQgdGhpcyBpbmNvbnNpc3Rl bmN5IG1heSBjb21lIHVwIGF0IHNvbWUgcG9pbnQuCgoKLWJvcmlzCgoKPiBUaGF0J3MgcmlnaHQs IGJ1dCBub3QgbGltaXRlZCB0byBBUk0uIFRoZSBzYW1lIHByb2JsZW0gZXhpc3RzIG9uIHg4NiBV UC4KPiBTbyB5ZXMsIHRoZSBjYWxsIG1ha2VzIHNlbnNlLCBidXQgdGhlIGNoYW5nZWxvZyBpcyBu b3QgcmVhbGx5IHVzZWZ1bC4KPiBMZXQgbWUgYWRkIGEgY29tbWVudCB0byB0aGlzLgo+Cj4gVGhh bmtzLAo+Cj4gICAgICAgICB0Z2x4Cj4KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJl ZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGlu Zm8vaW50ZWwtZ2Z4Cg==