x86, intr-remap: add option to disable interrupt remapping
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>
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937582382c
Коммит
03ea815506
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@ -1533,6 +1533,9 @@ and is between 256 and 4096 characters. It is defined in the file
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noinitrd [RAM] Tells the kernel not to load any configured
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initial RAM disk.
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nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
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remapping.
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nointroute [IA-64]
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nojitter [IA64] Disables jitter checking for ITC timers.
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@ -15,6 +15,14 @@ static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
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static int ir_ioapic_num;
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int intr_remapping_enabled;
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static int disable_intremap;
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static __init int setup_nointremap(char *str)
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{
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disable_intremap = 1;
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return 0;
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}
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early_param("nointremap", setup_nointremap);
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struct irq_2_iommu {
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struct intel_iommu *iommu;
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u16 irte_index;
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@ -506,6 +514,9 @@ int __init intr_remapping_supported(void)
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{
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struct dmar_drhd_unit *drhd;
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if (disable_intremap)
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return 0;
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for_each_drhd_unit(drhd) {
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struct intel_iommu *iommu = drhd->iommu;
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