From patchwork Wed Apr 16 20:31:38 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 4004011 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id DFA889F336 for ; Wed, 16 Apr 2014 20:31:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F17AA20306 for ; Wed, 16 Apr 2014 20:31:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E2D372034C for ; Wed, 16 Apr 2014 20:31:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756397AbaDPUbm (ORCPT ); Wed, 16 Apr 2014 16:31:42 -0400 Received: from mail-ie0-f170.google.com ([209.85.223.170]:35052 "EHLO mail-ie0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751357AbaDPUbl (ORCPT ); Wed, 16 Apr 2014 16:31:41 -0400 Received: by mail-ie0-f170.google.com with SMTP id rd18so11028239iec.15 for ; Wed, 16 Apr 2014 13:31:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=N6xPnTeK0C0cHzie7Q/reFkYSnu9rCsI3K1nZvcUEGQ=; b=T1Fv2ZcNDZw/Xqj2Sap7R1q0gNFp0eg02FgzofkJHe/WTB5sayLYdOT1gpP1WhNBAA 1jZBpIOLT60Mtu7ADnw8L0rbCM+u5pfPgZoYKiIWtV0HrZOpvMGGCW3YsF75mKSGsLJg VLXTfd66FtuWkqEOAgXxjKo7WZTPm4pdDgDMaubNEXZj647Jj8ZP0rPoHdpO6WRLF4Hy qGguktTWZtVgI9gbrzjHfK9tR4vGypq+vwDIIHi253Uzz5Y6Vtdupn9U+5I2K3lHjAd7 hueEhNbgkvyapuy39cxb9V2pUuypOGPFJecdg/XQCsqvn6Un1gpANO/XWdIqlrJBj5bZ bAlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-type:content-disposition:in-reply-to :user-agent; bh=N6xPnTeK0C0cHzie7Q/reFkYSnu9rCsI3K1nZvcUEGQ=; b=hSYrhK+TGlJOBUAlAThqsRHwcXoIHxsptkk8dxsrPaAxMaUwdWGiVtMZ8MR3M0+krR odIfu378RUV3o8mmDdFKc1DUxaU8CFnCV2AAP24inoCKk1OGbEIZWcL0pXl7gvbOe60P sdo3IBu7jN9I+qTrZCbWCsJc0O9VGpIKh6enGGbIYkYRfVaDCn5vkeZDwE2bFcTLI8Jb c8QYOGdGuov2DpkZNGp4XRgMmaBY2EgzAX7dNBSLoeYvRrxigFMM2xYl946wgUdLR8/V cKAddzqQPDPJEI2nGi3whUe/XIlMsxo83QfYf1QDhGfCD7bkpASM13wdrSEIo+JzAV0t J/MA== X-Gm-Message-State: ALoCoQlduR/+2QnsppTUjjW/uBinRECInugb1PXj1Htn+aMQXNGzlPLsRjN6xsf38IeyrMrLFhtBNXjYY2vqUP9wau183tupxfysrP2fC1aKdd4UrpoW861/k35VCtCXP1AEQYtWCB0ABy+M7aBqdfTxyFtb0d0or7Im/qZFd2+THQplwSqLErfkKeJL0OtqdpYefgjr4yimfU2rTDNzg66lTTbdp/ILOw== X-Received: by 10.43.134.3 with SMTP id ia3mr4017146icc.69.1397680300857; Wed, 16 Apr 2014 13:31:40 -0700 (PDT) Received: from google.com ([172.16.50.112]) by mx.google.com with ESMTPSA id sc8sm656443igb.0.2014.04.16.13.31.39 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Wed, 16 Apr 2014 13:31:40 -0700 (PDT) Date: Wed, 16 Apr 2014 14:31:38 -0600 From: Bjorn Helgaas To: Borislav Petkov Cc: "Rafael J. Wysocki" , "Zhang, Rui" , "Lu, Aaron" , lkml , "x86@kernel.org" , Linux PCI , ACPI Devel Maling List , Yinghai Lu , "H. Peter Anvin" , Stephane Eranian , "Yan, Zheng Z" Subject: Re: Info: mapping multiple BARs. Your kernel is fine. Message-ID: <20140416203138.GA17661@google.com> References: <20140224162400.GE16457@pd.tnic> <744357E9AAD1214791ACBA4B0B9092630121F201@SHSMSX101.ccr.corp.intel.com> <1558044.S1G2VU7srO@vostro.rjw.lan> <20140416190404.GA7070@pd.tnic> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20140416190404.GA7070@pd.tnic> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Wed, Apr 16, 2014 at 09:04:04PM +0200, Borislav Petkov wrote: > On Thu, Mar 20, 2014 at 02:48:30PM -0600, Bjorn Helgaas wrote: > > Right. Even if we had this long-term solution, we'd still have > > Stephane's current problem, because the PNP0C02 _CRS is still wrong. > > > > We do have a drivers/pnp/quirks.c where we could conceivably adjust > > the PNP resource if we found the matching PCI device and MCHBAR. That > > should solve Stephane's problem even with the current > > drivers/pnp/system.c. > > Guys, this still triggers in -rc1. Do we have a fix or something > testable at least? Hi Boris, Can you try the patch below? PNP: Work around Haswell BIOS defect in MCH area reporting From: Bjorn Helgaas Work around a Haswell BIOS defect that causes part of the MCH area to be unreported. MCHBAR is not an architected PCI BAR, so MCH space is usually reported as a PNP0C02 resource. The MCH space was 16KB prior to Haswell, but it is 32KB in Haswell. Some Haswell BIOSes still report a PNP0C02 resource that is only 16KB, which means the rest of the MCH space is consumed but unreported. This can cause resource map sanity check warnings or (theoretically) a device conflict if we assigned the unreported space to another device. The Intel perf event uncore driver tripped over this when it claimed the MCH region: resource map sanity check conflict: 0xfed10000 0xfed15fff 0xfed10000 0xfed13fff pnp 00:01 Info: mapping multiple BARs. Your kernel is fine. To prevent this, if we find a PNP0C02 resource that covers part of the MCH space, extend it to cover the entire space. Link: http://lkml.kernel.org/r/20140224162400.GE16457@pd.tnic Reported-by: Borislav Petkov Signed-off-by: Bjorn Helgaas --- drivers/pnp/quirks.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c index 258fef272ea7..023edf592371 100644 --- a/drivers/pnp/quirks.c +++ b/drivers/pnp/quirks.c @@ -334,6 +334,57 @@ static void quirk_amd_mmconfig_area(struct pnp_dev *dev) } #endif +static void quirk_intel_haswell_mch(struct pnp_dev *dev) +{ + struct pci_dev *host; + u32 addr_lo, addr_hi; + struct pci_bus_region region; + struct resource mch; + struct pnp_resource *pnp_res; + struct resource *res; + + host = pci_get_device(PCI_VENDOR_ID_INTEL, 0x0c00, NULL); + if (!host) + return; + + /* + * MCHBAR is not an architected PCI BAR, so MCH space is usually + * reported as a PNP0C02 resource. The MCH space was 16KB prior to + * Haswell, but it is 32KB in Haswell. Some Haswell BIOSes still + * report a PNP0C02 resource that is only 16KB, which means the + * rest of the MCH space is consumed but unreported. + */ + + /* + * Read MCHBAR for Host Member Mapped Register Range Base + * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet + * Sec 3.1.12. + */ + pci_read_config_dword(host, 0x48, &addr_lo); + region.start = addr_lo & ~0x7fff; + pci_read_config_dword(host, 0x4c, &addr_hi); + region.start |= (dma_addr_t) addr_hi << 32; + region.end = region.start + 32*1024 - 1 ; + pcibios_bus_to_resource(host->bus, &mch, ®ion); + + list_for_each_entry(pnp_res, &dev->resources, list) { + res = &pnp_res->res; + if (res->end < mch.start || res->start > mch.end) + continue; /* no overlap */ + if (res->start == mch.start && res->end == mch.end) + continue; /* exact match */ + + dev_info(&dev->dev, FW_BUG + "%pR covers only part of Intel Haswell MCH; extending to %pR\n", + res, &mch); + res->start = mch.start; + res->end = mch.end; + break; + } + + pci_dev_put(host); +} + /* * PnP Quirks * Cards or devices that need some tweaking due to incomplete resource info @@ -364,6 +415,7 @@ static struct pnp_fixup pnp_fixups[] = { #ifdef CONFIG_AMD_NB {"PNP0c01", quirk_amd_mmconfig_area}, #endif + {"PNP0c02", quirk_intel_haswell_mch}, {""} };