forked from luck/tmp_suning_uos_patched
03bbcb2e7e
A few years back intel published a spec update: http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chipset-ioh-specification-update.pdf For the 5520 and 5500 chipsets which contained an errata (specificially errata 53), which noted that these chipsets can't properly do interrupt remapping, and as a result the recommend that interrupt remapping be disabled in bios. While many vendors have a bios update to do exactly that, not all do, and of course not all users update their bios to a level that corrects the problem. As a result, occasionally interrupts can arrive at a cpu even after affinity for that interrupt has be moved, leading to lost or spurrious interrupts (usually characterized by the message: kernel: do_IRQ: 7.71 No irq handler for vector (irq -1) There have been several incidents recently of people seeing this error, and investigation has shown that they have system for which their BIOS level is such that this feature was not properly turned off. As such, it would be good to give them a reminder that their systems are vulnurable to this problem. For details of those that reported the problem, please see: https://bugzilla.redhat.com/show_bug.cgi?id=887006 [ Joerg: Removed CONFIG_IRQ_REMAP ifdef from early-quirks.c ] Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Prarit Bhargava <prarit@redhat.com> CC: Don Zickus <dzickus@redhat.com> CC: Don Dutile <ddutile@redhat.com> CC: Bjorn Helgaas <bhelgaas@google.com> CC: Asit Mallick <asit.k.mallick@intel.com> CC: David Woodhouse <dwmw2@infradead.org> CC: linux-pci@vger.kernel.org CC: Joerg Roedel <joro@8bytes.org> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> CC: Arkadiusz Miśkiewicz <arekm@maven.pl> Signed-off-by: Joerg Roedel <joro@8bytes.org>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Copyright (C) 2012 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <joerg.roedel@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This header file contains stuff that is shared between different interrupt
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* remapping drivers but with no need to be visible outside of the IOMMU layer.
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*/
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#ifndef __IRQ_REMAPPING_H
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#define __IRQ_REMAPPING_H
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#ifdef CONFIG_IRQ_REMAP
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struct IO_APIC_route_entry;
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struct io_apic_irq_attr;
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struct irq_data;
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struct cpumask;
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struct pci_dev;
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struct msi_msg;
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extern int disable_irq_remap;
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extern int irq_remap_broken;
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extern int disable_sourceid_checking;
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extern int no_x2apic_optout;
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extern int irq_remapping_enabled;
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struct irq_remap_ops {
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/* Check whether Interrupt Remapping is supported */
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int (*supported)(void);
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/* Initializes hardware and makes it ready for remapping interrupts */
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int (*prepare)(void);
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/* Enables the remapping hardware */
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int (*enable)(void);
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/* Disables the remapping hardware */
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void (*disable)(void);
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/* Reenables the remapping hardware */
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int (*reenable)(int);
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/* Enable fault handling */
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int (*enable_faulting)(void);
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/* IO-APIC setup routine */
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int (*setup_ioapic_entry)(int irq, struct IO_APIC_route_entry *,
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unsigned int, int,
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struct io_apic_irq_attr *);
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/* Set the CPU affinity of a remapped interrupt */
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int (*set_affinity)(struct irq_data *data, const struct cpumask *mask,
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bool force);
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/* Free an IRQ */
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int (*free_irq)(int);
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/* Create MSI msg to use for interrupt remapping */
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void (*compose_msi_msg)(struct pci_dev *,
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unsigned int, unsigned int,
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struct msi_msg *, u8);
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/* Allocate remapping resources for MSI */
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int (*msi_alloc_irq)(struct pci_dev *, int, int);
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/* Setup the remapped MSI irq */
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int (*msi_setup_irq)(struct pci_dev *, unsigned int, int, int);
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/* Setup interrupt remapping for an HPET MSI */
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int (*setup_hpet_msi)(unsigned int, unsigned int);
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};
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extern struct irq_remap_ops intel_irq_remap_ops;
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extern struct irq_remap_ops amd_iommu_irq_ops;
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#else /* CONFIG_IRQ_REMAP */
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#define irq_remapping_enabled 0
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#define disable_irq_remap 1
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#define irq_remap_broken 0
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#endif /* CONFIG_IRQ_REMAP */
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#endif /* __IRQ_REMAPPING_H */
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