From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 555631B3742; Thu, 1 Aug 2024 17:49:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722534565; cv=none; b=Rq/jZ3s2dtncIbApjfg5PbCIwC1PEPMOm37Hpr5jVhGr3JvpX9CQZnOZ/9o07hzt0mVccbiIyFthR9fTAGaAUwx5xXLOj5eO/mbpDLfDcG9LoUKiFUlDYfaUMc2uBnIYIkcYZgOvUWY3r3/LRdlghAHg+Rd1ZmPHav9qTMEXxng= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722534565; c=relaxed/simple; bh=6Bf+jCt4q1QeDc0N/rdODARUoK/GdHWpT2CS6sbw1YM=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=l55eLa2xQa5jzuWjn+DDFERQ4HFu4LDv27xbgNp650ZmN4BPKw6ypwflmg9u161q7Mh5YILlwTYGKG209ifh5lWxToPQZYbo8rrXigi3o79FyJIbBgcmJVn8CsRJ7UgZkaCawPgEjA8GWT1G/hjcC2/elWEDQqiDzWaMAMBWu7A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=GspRwBF4; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="GspRwBF4" 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:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=6Bf+jCt4q1QeDc0N/rdODARUoK/GdHWpT2CS6sbw1YM=; b=GspRwBF4C4g1UGzvi3YQE9QxsN LRHMFFqAEvOPcA8tciadu070stRn3kxPwSVny3oI24KTduUywU7vPJ7wUD1CQhPUSw38hKmBUwGMg wecjtTLSp1lDGgZHeCgFWsuA8FuIZJKbdhnSJ+2EZdSllHj/bM2ui7ad+E2SUa1sX+KGcku3DwnjK wlYdp+a1lYpVsMjrr6RSHqyIH7dCbkI8nQtfQJR4gz629DVX99bcLoVxinrV9FvMIs6itLQmmGU0l 3SF0AFCxr1CWZqJR9KPlQ1rwq6pSxvwz7CvDfOhN6PlBNFaF1DoNSlOzdhIydO8CZr17nie2SAZuj 4bvEV0PA==; Received: from [2001:8b0:10b:5:9c27:6796:c1af:9131] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZZvK-000000008X6-3CLj; Thu, 01 Aug 2024 17:49:10 +0000 Message-ID: Subject: Re: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown From: David Woodhouse To: Thomas Gleixner , lirongqing@baidu.com, seanjc@google.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 01 Aug 2024 18:49:10 +0100 In-Reply-To: <87ttg42uju.ffs@tglx> References: <1675732476-14401-1-git-send-email-lirongqing@baidu.com> <87ttg42uju.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-igDgmdeeroMfjB6DIbtQ" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-igDgmdeeroMfjB6DIbtQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-08-01 at 16:21 +0200, Thomas Gleixner wrote: > On Tue, Feb 07 2023 at 09:14, lirongqing@baidu.com=C2=A0wrote: > > @@ -117,11 +110,6 @@ static int pit_shutdown(struct clock_event_device = *evt) > > =C2=A0 > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0outb_p(0x30, PIT_MODE); > > =C2=A0 > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (i8253_clear_counter_on_s= hutdown) { > > -=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=C2=A0outb_p(0, PIT_CH0); > > -=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=C2=A0outb_p(0, PIT_CH0); > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} > > - >=20 > The stop sequence is wrong: >=20 > =C2=A0=C2=A0=C2=A0 When there is a count in progress, writing a new LSB b= efore the > =C2=A0=C2=A0=C2=A0 counter has counted down to 0 and rolled over to FFFFh= , WILL stop > =C2=A0=C2=A0=C2=A0 the counter.=C2=A0 However, if the LSB is loaded AFTER= the counter has > =C2=A0=C2=A0=C2=A0 rolled over to FFFFh, so that an MSB now exists in the= counter, then > =C2=A0=C2=A0=C2=A0 the counter WILL NOT stop. >=20 > The original i8253 datasheet says: >=20 > =C2=A0=C2=A0=C2=A0 1) Write 1st byte stops the current counting > =C2=A0=C2=A0=C2=A0 2) Write 2nd byte starts the new count It says that for mode zero ("Interrupt on Terminal Count"), yes. But in that mode, shouldn't the IRQ only fire *one* more time anyway, rather than repeatedly? That should be OK, shouldn't it? "When terminal count is reached, the output will go high and remain high until the selected count register is reloaded wityh the mode or a new count is loaded". It's OK for it to keep *counting* as long as it stops firing interrupts, isn't it?=20 Either way, this is somewhat orthogonal to the patch I posted in=20 https://lore.kernel.org/kvm/6cd62b5058e11a6262cb2e798cc85cc5daead3b1.camel@= infradead.org/T/#u for the fact that we don't shut down the PIT at *all* if we aren't ever going to use it. I'm glad I decided to export a function from the clocksource driver and just *call* it from pit_timer_init() though. Means we can bikeshed the shutdown sequence in *one* place and it isn't duplicated. --=-igDgmdeeroMfjB6DIbtQ 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 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