Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756790AbaDPW4I (ORCPT ); Wed, 16 Apr 2014 18:56:08 -0400 Received: from mail-ie0-f170.google.com ([209.85.223.170]:38463 "EHLO mail-ie0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752459AbaDPW4E (ORCPT ); Wed, 16 Apr 2014 18:56:04 -0400 Date: Wed, 16 Apr 2014 16:56:00 -0600 From: Bjorn Helgaas To: Dave Jones , Borislav Petkov , "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: <20140416225600.GA23781@google.com> References: <20140224162400.GE16457@pd.tnic> <744357E9AAD1214791ACBA4B0B9092630121F201@SHSMSX101.ccr.corp.intel.com> <1558044.S1G2VU7srO@vostro.rjw.lan> <20140416190404.GA7070@pd.tnic> <20140416203138.GA17661@google.com> <20140416223122.GA2767@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140416223122.GA2767@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 16, 2014 at 06:31:22PM -0400, Dave Jones wrote: > On Wed, Apr 16, 2014 at 02:31:38PM -0600, Bjorn Helgaas wrote: > > 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? > > I'm seeing the exact same message on my thinkpad t430s. > When I try your patch, modesetting no longer works. When it tries > to change to the framebuffer I get a black screen and lockup. > If I boot with nomodeset it locks up when it gets to X. > It all scrolls by too fast to read, but it looks like there's still > a backtrace present. Ouch, sorry about that. I do see a bug in my patch (fixed below), but I don't see how that could cause what you're seeing. Maybe I could figure out something from this info (this can be from a kernel without my patch): - dmesg log - output of "find /sys/devices/pnp0 -name id -o -name resources | xargs grep ." - output of "sudo lspci -s00:00.0 -xxx" 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 | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c index 258fef272ea7..8402088d4145 100644 --- a/drivers/pnp/quirks.c +++ b/drivers/pnp/quirks.c @@ -334,6 +334,60 @@ 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 ; + + memset(&mch, 0, sizeof(mch)); + mch.flags = IORESOURCE_MEM; + 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 +418,7 @@ static struct pnp_fixup pnp_fixups[] = { #ifdef CONFIG_AMD_NB {"PNP0c01", quirk_amd_mmconfig_area}, #endif + {"PNP0c02", quirk_intel_haswell_mch}, {""} }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/