Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754539AbbHIIzV (ORCPT ); Sun, 9 Aug 2015 04:55:21 -0400 Received: from mga01.intel.com ([192.55.52.88]:9018 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754099AbbHIIzP (ORCPT ); Sun, 9 Aug 2015 04:55:15 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,638,1432623600"; d="scan'208";a="764979271" From: Jiang Liu To: "Rafael J . Wysocki" , Nick Meier , "Rafael J. Wysocki" , Len Brown , Pavel Machek , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org Cc: Jiang Liu , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [Patch v1] x86, ACPI, irq: Fix a regression caused by Date: Sun, 9 Aug 2015 16:58:29 +0800 Message-Id: <1439110710-26498-1-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4070 Lines: 111 Nick Meier reported a regression with HyperV that " After rebooting the VM, the following messages are logged in syslog when trying to load the tulip driver: tulip: Linux Tulip drivers version 1.1.15 (Feb 27, 2007) tulip: 0000:00:0a.0: PCI INT A: failed to register GSI tulip: Cannot enable tulip board #0, aborting tulip: probe of 0000:00:0a.0 failed with error -16 Errors occur in 3.19.0 kernel Works in 3.17 kernel. " According to the ACPI dump file posted by Nick at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072 The ACPI MADT table includes an interrupt source overridden entry for ACPI SCI: [236h 0566 1] Subtable Type : 02 [237h 0567 1] Length : 0A [238h 0568 1] Bus : 00 [239h 0569 1] Source : 09 [23Ah 0570 4] Interrupt : 00000009 [23Eh 0574 2] Flags (decoded below) : 000D Polarity : 1 Trigger Mode : 3 That means ACPI SCI interrupt(Interrupt : 00000009) works in level(Trigger Mode : 3), high(Polarity : 1) mode. And in DSDT table, we have _PRT method to define PCI interrupts, which eventually goes to: Name (PRSA, ResourceTemplate () { IRQ (Level, ActiveLow, Shared, ) {3,4,5,7,9,10,11,12,14,15} }) Name (PRSB, ResourceTemplate () { IRQ (Level, ActiveLow, Shared, ) {3,4,5,7,9,10,11,12,14,15} }) Name (PRSC, ResourceTemplate () { IRQ (Level, ActiveLow, Shared, ) {3,4,5,7,9,10,11,12,14,15} }) Name (PRSD, ResourceTemplate () { IRQ (Level, ActiveLow, Shared, ) {3,4,5,7,9,10,11,12,14,15} }) which means it's also possible to use IRQ9 for PCI interrupt, but works in Level, ActiveLow mode. So it conflicts with ACPI SCI interrupt source overriddern. So implement a quirk to correct interrupt attribute for HyperV SCI interrupt. Nick reports the proposed patch fixes the regression as " Applied the above proposed patch with the DMI values substituted. The tulip driver loaded, and an address was assigned via DHCP. " Please refer to following links for more information: https://bugzilla.kernel.org/show_bug.cgi?id=101301 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072 Fixes: cd68f6bd53cf ("x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI") Reported-and-tested-by: Nick Meier Cc: # 3.19 Signed-off-by: Jiang Liu --- arch/x86/kernel/acpi/boot.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index e49ee24da85e..47d95a86d56d 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1308,6 +1308,13 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) return 0; } +static int __init acpi_force_hyperv_sci_attr(const struct dmi_system_id *d) +{ + acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW | + (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK); + return 0; +} + /* * ACPI offers an alternative platform interface model that removes * ACPI hardware requirements for platforms that do not implement @@ -1458,6 +1465,14 @@ static struct dmi_system_id __initdata acpi_dmi_table_late[] = { DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"), }, }, + { + .callback = acpi_force_hyperv_sci_attr, + .ident = "HyperV", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"), + }, + }, {} }; -- 1.7.10.4 -- 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/