unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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x86, intr-remap: add option to disable interrupt remapping

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Add option "nointremap" to disable interrupt remapping.

[ Impact: add new boot option ]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: allen.m.kay@intel.com
Cc: fenghua.yu@intel.com
LKML-Reference: <1239957736-6161-5-git-send-email-weidong.han@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Weidong Han 2009-04-17 16:42:15 +08:00 committed by Ingo Molnar
parent 937582382c
commit 03ea815506
2 changed files with 14 additions and 0 deletions
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3
Documentation/kernel-parameters.txt
View file

@ -1533,6 +1533,9 @@ and is between 256 and 4096 characters. It is defined in the file
noinitrd [RAM] Tells the kernel not to load any configured
initial RAM disk.
nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
remapping.
nointroute [IA-64]
nojitter [IA64] Disables jitter checking for ITC timers.

11
drivers/pci/intr_remapping.c
View file

@ -15,6 +15,14 @@ static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static int ir_ioapic_num;
int intr_remapping_enabled;
static int disable_intremap;
static __init int setup_nointremap(char *str)
{
disable_intremap = 1;
return 0;
}
early_param("nointremap", setup_nointremap);
struct irq_2_iommu {
struct intel_iommu *iommu;
u16 irte_index;
@ -506,6 +514,9 @@ int __init intr_remapping_supported(void)
{
struct dmar_drhd_unit *drhd;
if (disable_intremap)
return 0;
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;