]> git.karo-electronics.de Git - mv-sheeva.git/commit
intel-iommu: Fix kernel hang if interrupt remapping disabled in BIOS
authorYouquan Song <youquan.song@intel.com>
Wed, 9 Sep 2009 16:05:39 +0000 (12:05 -0400)
committerDavid Woodhouse <David.Woodhouse@intel.com>
Fri, 11 Sep 2009 15:40:10 +0000 (16:40 +0100)
commit074835f0143b83845af5044af2739c52c9f53808
treef573860163fda805b97656f7bc400f148179e1a9
parente936d0773df172ec8600777fdd72bbc1f75f22ad
intel-iommu: Fix kernel hang if interrupt remapping disabled in BIOS

BIOS clear DMAR table INTR_REMAP flag to disable interrupt remapping. Current
kernel only check interrupt remapping(IR) flag in DRHD's extended capability
register to decide interrupt remapping support or not. But IR flag will not
change when BIOS disable/enable interrupt remapping.

When user disable interrupt remapping in BIOS or BIOS often defaultly disable
interrupt remapping feature when BIOS is not mature.Though BIOS disable
interrupt remapping but intr_remapping_supported function will always report
to OS support interrupt remapping if VT-d2 chipset populated. On this
cases, kernel will continue enable interrupt remapping and result kernel panic.
This bug exist on almost all platforms with interrupt remapping support.

This patch add DMAR table INTR_REMAP flag check before enable interrupt
remapping.

Signed-off-by: Youquan Song <youquan.song@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
drivers/pci/dmar.c
drivers/pci/intr_remapping.c
include/linux/intel-iommu.h