xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ

Browse Source 
Avoid IRQs occupied by ISA IRQs when allocating IRQs for PCI link devices,
otherwise it may cause interrupt storm due to incompatible pin attributes.

This issue was triggered on a KVM virtual machine, which
 1) uses IRQ9 for SCI in high level mode.
 2) defines an PCI interrupt link device (LNKS) with IRQ9 as the only
    possible irq.
 3) has an PCI device referring to link device LNKS.
So it causes interrupt storm when enabling the PCI device because PCI IRQ
works in low level mode.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu
2015-09-17 14:02:45 +08:00
committed by Rafael J. Wysocki
parent 1f93e4a96c
commit 5ebc760353
3 changed files with 15 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/acpi.h
View File

@@ -217,6 +217,7 @@ struct pci_dev;
int acpi_pci_irq_enable (struct pci_dev *dev);
void acpi_penalize_isa_irq(int irq, int active);
bool acpi_isa_irq_available(int irq);
void acpi_penalize_sci_irq(int irq, int trigger, int polarity);
void acpi_pci_irq_disable (struct pci_dev *dev);