71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
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#include <linux/dmar.h>
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#include <asm/io_apic.h>
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#include "intel-iommu.h"
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#include "intr_remapping.h"
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static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
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static int ir_ioapic_num;
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static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
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struct intel_iommu *iommu)
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{
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struct acpi_dmar_hardware_unit *drhd;
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struct acpi_dmar_device_scope *scope;
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void *start, *end;
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drhd = (struct acpi_dmar_hardware_unit *)header;
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start = (void *)(drhd + 1);
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end = ((void *)drhd) + header->length;
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while (start < end) {
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scope = start;
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if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) {
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if (ir_ioapic_num == MAX_IO_APICS) {
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printk(KERN_WARNING "Exceeded Max IO APICS\n");
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return -1;
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}
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printk(KERN_INFO "IOAPIC id %d under DRHD base"
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" 0x%Lx\n", scope->enumeration_id,
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drhd->address);
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ir_ioapic[ir_ioapic_num].iommu = iommu;
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ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
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ir_ioapic_num++;
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}
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start += scope->length;
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}
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return 0;
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}
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/*
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* Finds the assocaition between IOAPIC's and its Interrupt-remapping
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* hardware unit.
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*/
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int __init parse_ioapics_under_ir(void)
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{
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struct dmar_drhd_unit *drhd;
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int ir_supported = 0;
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for_each_drhd_unit(drhd) {
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struct intel_iommu *iommu = drhd->iommu;
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if (ecap_ir_support(iommu->ecap)) {
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if (ir_parse_ioapic_scope(drhd->hdr, iommu))
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return -1;
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ir_supported = 1;
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}
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}
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if (ir_supported && ir_ioapic_num != nr_ioapics) {
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printk(KERN_WARNING
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"Not all IO-APIC's listed under remapping hardware\n");
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return -1;
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}
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return ir_supported;
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}
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