From patchwork Thu Sep 30 17:21:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12528933 X-Patchwork-Delegate: bhelgaas@google.com 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64F98C433FE for ; Thu, 30 Sep 2021 17:21:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3ED5F619E7 for ; Thu, 30 Sep 2021 17:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352539AbhI3RXY (ORCPT ); Thu, 30 Sep 2021 13:23:24 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:51510 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352498AbhI3RXX (ORCPT ); Thu, 30 Sep 2021 13:23:23 -0400 From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1633022500; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=GA+E0IP9wAji4oISu6ACw4UTTLxZjlZyU/M+r1RXI64=; b=OocumTjfdzaeeXe2YA+xo/7eisqf9hhrMQrNELBYo4DoMtylhXK2VroKlyHU3f+sLL8DcC mrhoA97ju7OHSRlEQmoHnSfSboUw5SCKDEOnJqHvTPd7PTNNE/ewIkgfuOaVetUl611pQR 0uphGDoRfXsL/vA8OKvNovBla6eTQ6d0r6TxCwt4vaxExX1P+evdfzuXNsbdjFW/FrVuZ2 5v5XdeWSJW3Lau9VthhrhskdsC0ykl7r9oNe78Qil0vOhy4ww8J8j34szv9/SImVEhBQHH Sl2aRPgrrX0m3JICsNzY8fysZ5WY/PpT06dV2mtmqs4DdjW8C3nDLWRYWqRXXQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1633022500; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=GA+E0IP9wAji4oISu6ACw4UTTLxZjlZyU/M+r1RXI64=; b=KpC7FemuoCU3saAzexR+zyGtoKX5BgAflK7A4YyltKE2m3KAShvUyE7oCpPkEghC9tCght LRK2H2/B/J317TAg== To: "Rafael J. Wysocki" Cc: Bjorn Helgaas , Jakub Kicinski , the arch/x86 maintainers , jose.souza@intel.com, "H. Peter Anvin" , Borislav Petkov , Ingo Molnar , Kai-Heng Feng , Bjorn Helgaas , Linux PCI , rudolph@fb.com, xapienz@fb.com, bmilton@fb.com, "Paul E. McKenney" , Stable , "Rafael J. Wysocki" , Dave Hansen , Feng Tang , Harry Pan Subject: [PATCH RFT v2] x86/hpet: Use another crystalball to evaluate HPET usability In-Reply-To: <87h7e26lh9.ffs@tglx> References: <20210929160550.GA773748@bhelgaas> <87mtnu77mr.ffs@tglx> <87k0iy71rw.ffs@tglx> <87h7e26lh9.ffs@tglx> Date: Thu, 30 Sep 2021 19:21:39 +0200 Message-ID: <87czoq6kt8.ffs@tglx> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On recent Intel systems the HPET stops working when the system reaches PC10 idle state. The approach of adding PCI ids to the early quirks to disable HPET on these systems is a whack a mole game which makes no sense. Check for PC10 instead and force disable HPET if supported. The check is overbroad as it does not take ACPI, intel_idle enablement and command line parameters into account. That's fine as long as there is at least PMTIMER available to calibrate the TSC frequency. The decision can be overruled by adding "hpet=force" on the kernel command line. Remove the related early PCI quirks for affected Ice Cake and Coffin Lake systems as they are not longer required. That should also cover all other systems, i.e. Tiger Rag and newer generations, which are most likely affected by this as well. Fixes: Yet another hardware trainwreck Reported-by: Jakub Kicinski Not-yet-signed-off-by: Thomas Gleixner Tested-by: Jakub Kicinski Reviewed-by: Rafael J. Wysocki --- Notes: Completely untested. Use at your own peril. V2: Move the substate check into the helper function. Adjust function name accordingly. --- arch/x86/kernel/early-quirks.c | 6 --- arch/x86/kernel/hpet.c | 81 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+), 6 deletions(-) --- a/arch/x86/kernel/early-quirks.c +++ b/arch/x86/kernel/early-quirks.c @@ -714,12 +714,6 @@ static struct chipset early_qrk[] __init */ { PCI_VENDOR_ID_INTEL, 0x0f00, PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, - { PCI_VENDOR_ID_INTEL, 0x3e20, - PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, - { PCI_VENDOR_ID_INTEL, 0x3ec4, - PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, - { PCI_VENDOR_ID_INTEL, 0x8a12, - PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet}, { PCI_VENDOR_ID_BROADCOM, 0x4331, PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset}, {} --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -10,6 +10,7 @@ #include #include #include +#include #undef pr_fmt #define pr_fmt(fmt) "hpet: " fmt @@ -916,6 +917,83 @@ static bool __init hpet_counting(void) return false; } +static bool __init mwait_pc10_supported(void) +{ + unsigned int eax, ebx, ecx, mwait_substates; + + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) + return false; + + if (!cpu_feature_enabled(X86_FEATURE_MWAIT)) + return false; + + if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF) + return false; + + cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates); + + return (ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) && + (ecx & CPUID5_ECX_INTERRUPT_BREAK) && + (mwait_substates & (0xF << 28)); +} + +/* + * Check whether the system supports PC10. If so force disable HPET as that + * stops counting in PC10. This check is overbroad as it does not take any + * of the following into account: + * + * - ACPI tables + * - Enablement of intel_idle + * - Command line arguments which limit intel_idle C-state support + * + * That's perfectly fine. HPET is a piece of hardware designed by committee + * and the only reasons why it is still in use on modern systems is the + * fact that it is impossible to reliably query TSC and CPU frequency via + * CPUID or firmware. + * + * If HPET is functional it is useful for calibrating TSC, but this can be + * done via PMTIMER as well which seems to be the last remaining timer on + * X86/INTEL platforms that has not been completely wreckaged by feature + * creep. + * + * In theory HPET support should be removed altogether, but there are older + * systems out there which depend on it because TSC and APIC timer are + * dysfunctional in deeper C-states. + * + * It's only 20 years now that hardware people have been asked to provide + * reliable and discoverable facilities which can be used for timekeeping + * and per CPU timer interrupts. + * + * The probability that this problem is going to be solved in the + * forseeable future is close to zero, so the kernel has to be cluttered + * with heuristics to keep up with the ever growing amount of hardware and + * firmware trainwrecks. Hopefully some day hardware people will understand + * that the approach of "This can be fixed in software" is not sustainable. + * Hope dies last... + */ +static bool __init hpet_is_pc10_damaged(void) +{ + unsigned long long pcfg; + + /* Check whether PC10 substates are supported */ + if (!mwait_pc10_supported()) + return false; + + /* Check whether PC10 is enabled in PKG C-state limit */ + rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, pcfg); + if ((pcfg & 0xF) < 8) + return false; + + if (hpet_force_user) { + pr_warn("HPET force enabled via command line, but dysfunctional in PC10.\n"); + return false; + } + + pr_info("HPET dysfunctional in PC10. Force disabled.\n"); + boot_hpet_disable = true; + return true; +} + /** * hpet_enable - Try to setup the HPET timer. Returns 1 on success. */ @@ -929,6 +1007,9 @@ int __init hpet_enable(void) if (!is_hpet_capable()) return 0; + if (hpet_is_pc10_damaged()) + return 0; + hpet_set_mapping(); if (!hpet_virt_address) return 0;