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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C3509C2BA1A for ; Thu, 20 Jun 2024 14:33:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-Type: References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5YxN3nX6bRn6nyiZlxwE/5OuYEREwWAIzQfbGzVr2I0=; b=pkkGdPyTbc38/NF6sHIQEUu15g Rw4gF54W0/zpHlp+T0hR4XjaWwAT2LFdqLsurULo5MtooN4PNX/+Oip3CNWmklUY/gfic46ThH4+h 4OoK/o8Wepbgnc5aRnQ5y+WIFeB7dp3VwGwPL5wLl92MKBfWdOBtVs72pf9fOETfyaVoPmFliK9ia juIVWsqVDvNI5VUaOhVr8IY+Plxx8uA28zgkH/x41yz3LC5E0cuTZ2l++NHJ3DphD7hWaIQskjkOp ruT4eKUwOQ3LqMopLDjWYoFYFeeISmRpKnMUIHFvoZR2gQwuO0hm3WS6I2a0mOOyFZn1IY2uK+uFk gfIfE+ew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKIqg-00000005TTk-2QUk; Thu, 20 Jun 2024 14:33:14 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKIqf-00000005TTQ-1THP for linux-arm-kernel@bombadil.infradead.org; Thu, 20 Jun 2024 14:33:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5YxN3nX6bRn6nyiZlxwE/5OuYEREwWAIzQfbGzVr2I0=; b=Nw5hDa6Tl5cKkuHwJGts77mShc 45KPu02za/4W6hGQ/hFlCT5kUiboH7eP7Te8gvCK8WgBgtY8w6jVA5DkbqW9itiWe5GTj491c9kS6 79hfYr4lrZGOAoCU2rzy8EhpMOqli6x4r/JW4G0YUbCnsGVvUV3ad7kXhTffvjsm6Dffs7TFDWH4y 4mHRrZsDwX0N/wWdDbAFrZO598b//0EmckMhkA61s+eRmmoXe15s7R05+15w1Wqn6hY4uJisZ4aRe fwt1kvzjcZ32k1ST07kbZ+pZci510KTYaJFUF+bmN8MAUJjMJTG6xjZuSnWJ3yRDfIhOxCAxtFKbq Sgc8a97A==; Received: from [2001:8b0:10b:5:e421:dd18:8da5:9cf5] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKIqZ-000000069fc-0MBe; Thu, 20 Jun 2024 14:33:07 +0000 Message-ID: <01e1d19f290f49e12c67dbe8aadb8be49cc53eb4.camel@infradead.org> Subject: Re: [RFC PATCH v3 5/7] virtio_rtc: Add PTP clocks From: David Woodhouse To: Peter Hilber , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, virtio-dev@lists.oasis-open.org Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Richard Cochran , netdev@vger.kernel.org, Marc Zyngier , Mark Rutland , Daniel Lezcano , Thomas Gleixner , linux-arm-kernel@lists.infradead.org Date: Thu, 20 Jun 2024 15:33:06 +0100 In-Reply-To: <647cfef4-bcf1-4156-b6ae-b2e089778096@opensynergy.com> References: <20231218073849.35294-1-peter.hilber@opensynergy.com> <20231218073849.35294-6-peter.hilber@opensynergy.com> <647cfef4-bcf1-4156-b6ae-b2e089778096@opensynergy.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-LoBongcHy+He7fUVCtsw" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --=-LoBongcHy+He7fUVCtsw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-06-20 at 14:01 +0200, Peter Hilber wrote: > On 15.06.24 10:01, David Woodhouse wrote: > > On Mon, 2023-12-18 at 08:38 +0100, Peter Hilber wrote: > > >=20 > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret =3D viortc_hw_xtstamp_param= s(&hw_counter, &cs_id); > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (ret) > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 return ret; > > > + > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ktime_get_snapshot(&history_beg= in); > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (history_begin.cs_id !=3D cs= _id) > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 return -EOPNOTSUPP; > >=20 > > I think you have to call ktime_get_snapshot() anyway to get a snapshot > > from before your crosststamp? But I still don't much like the fact that > > you need to use it to work out which cs_id is being used. >=20 > The actual cs_id check is in get_device_system_crosststamp(), where it wa= s > added recently [1]. So this additional check is just verifying that the > history_begin is usable. > > > Shouldn't get_device_system_crosststamp() pass that to its get_time_fn > > as a hint? >=20 > This is unneeded in this case, since get_device_system_crosststamp() does > the check already (but the driver is free to pass it through the > get_time_fn parameter ctx). The *check* is a different thing. As things stand, the device has to *choose* a cs_id to use, and takes a gamble on that check in get_device_system_crosststamp() throwing the crosststamp away with -ENODEV because the device picked the wrong cs_id. That's why I'm saying it would be nicer if the core code *told* the device what cs_id to use. Rather than just throwing it away if the device guesses wrong. (Yes, it would have to be considered a hint, because it could theoretically have *changed* by the time the result is obtained, just as with your code above.) > >=20 > > On x86, you are likely to find that history_begin.cs_id is the KVM > > clock, so this will return -EOPNOTSUPP and userspace will have to fall > > back to PTP_SYS_OFFSET. I note the KVM PTP clock actually *converts* a > > TSC-based crosststamp to kvmclock =C2=B5s for itself, so that it can re= port=20 > > *cs_id =3D CSID_X86_KVM_CLK. Not sure how I feel about that though. I'm > > inclined to suggest that it shouldn't, as anyone who wants accurate > > timekeeping shouldn't be using the KVM clock anyway. > >=20 > > But we should at least be relatively consistent about it. >=20 > ATM, the driver does indeed not have TSC support (for cross-timestamping) > enabled at all, so would always use fallback. If *not* using the KVM cloc= k, > I think TSC can just be enabled by adding architecture-specific code > similar to virtio_rtc_arm.c. >=20 > I am not familiar with the KVM clock, but maybe it would be sufficient to > allow CSID_X86_KVM_CLK as well? Sure, that's what the ptp_kvm clock does. It actually obtains a TSC reading from the "hardware", and then manually (and unconditionally) converts that to a kvmclock value so that it can return a clock pairing based on CSID_X86_KVM_CLK. Which works until the user configures the clocksource to be the TSC instead of kvmclock, and then hits that -ENODEV check and has to do the fallback. We should just tell the device which cs_id to use. --=-LoBongcHy+He7fUVCtsw Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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