From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753094AbbIPNKL (ORCPT ); Wed, 16 Sep 2015 09:10:11 -0400 Received: from casper.infradead.org ([85.118.1.10]:52484 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752362AbbIPNKJ (ORCPT ); Wed, 16 Sep 2015 09:10:09 -0400 Message-ID: <1442409003.131189.87.camel@infradead.org> Subject: [PATCH] Fix Geode LX timekeeping in generic build From: David Woodhouse To: Andres Salomon , x86@kernel.org Cc: linux-kernel@vger.kernel.org, Marcelo Tosatti , stable@vger.kernel.org Date: Wed, 16 Sep 2015 14:10:03 +0100 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-4Vi6UoPq0ZDhOxfWqocn" X-Mailer: Evolution 3.16.5 (3.16.5-1.fc22) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-4Vi6UoPq0ZDhOxfWqocn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable In 2007, commit 07190a08eef36 ("Mark TSC on GeodeLX reliable") bypassed verification of the TSC on Geode LX. However, this code (now in the check_system_tsc_reliable() function in arch/x86/kernel/tsc.c) was only present if CONFIG_MGEODE_LX was set.=20 OpenWRT has recently started building its generic Geode target for Geode GX, not LX, to include support for additional platforms. This broke the timekeeping on LX-based devices, because the TSC wasn't marked as reliable: https://dev.openwrt.org/ticket/20531 By adding a runtime check on is_geode_lx(), we can also include the fix if CONFIG_MGEODEGX1 or CONFIG_X86_GENERIC are set, thus fixing the problem. Signed-off-by: David Woodhouse Cc: stable@vger.kernel.org --- I'm slightly concerned about bypassing verification though, when the reason I *noticed* this issue is because the verification *failed*: [ 8.893307] xt_time: kernel timezone is -0000 = =20 [ 14.522754] clocksource: timekeeping watchdog: Marking clocksource 'tsc'= as unstable because the skew is too large: = =20 [ 14.555090] clocksource: 'pit' wd_now: eba5b2f7 wd= _last: eb9ca2c8 mask: ffffffff = =20 [ 14.564406] clocksource: 'tsc' cs_now: 29eb8ba17 c= s_last: 28c61a5f6 mask: ffffffffffffffff = =20 [ 14.598508] clocksource: Switched to clocksource pit =20 If the bypass is supposed to be just an optimisation, surely this means there's something else wrong? Or that bypassing the validation wasn't the right thing to do in the first place? FWIW the clock *does* run correctly if using the TSC, after applying this patch. If I let it fall back to the PIT, it gains time wildly. diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 7437b41..dc9af7a 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -21,6 +21,7 @@ #include #include #include +#include =20 unsigned int __read_mostly cpu_khz; /* TSC clocks / usec, not used here */ EXPORT_SYMBOL(cpu_khz); @@ -1013,15 +1014,17 @@ EXPORT_SYMBOL_GPL(mark_tsc_unstable); =20 static void __init check_system_tsc_reliable(void) { -#ifdef CONFIG_MGEODE_LX - /* RTSC counts during suspend */ +#if defined(CONFIG_MGEODEGX1) || defined(CONFIG_MGEODE_LX) || defined(CONF= IG_X86_GENERIC) + if (is_geode_lx()) { + /* RTSC counts during suspend */ #define RTSC_SUSP 0x100 - unsigned long res_low, res_high; + unsigned long res_low, res_high; =20 - rdmsr_safe(MSR_GEODE_BUSCONT_CONF0, &res_low, &res_high); - /* Geode_LX - the OLPC CPU has a very reliable TSC */ - if (res_low & RTSC_SUSP) - tsc_clocksource_reliable =3D 1; + rdmsr_safe(MSR_GEODE_BUSCONT_CONF0, &res_low, &res_high); + /* Geode_LX - the OLPC CPU has a very reliable TSC */ + if (res_low & RTSC_SUSP) + tsc_clocksource_reliable =3D 1; + } #endif if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE)) tsc_clocksource_reliable =3D 1; --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-4Vi6UoPq0ZDhOxfWqocn Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN 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