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ad3ad3f6 SS |
1 | #include <linux/dmar.h> |
2 | #include <asm/io_apic.h> | |
3 | #include "intel-iommu.h" | |
4 | #include "intr_remapping.h" | |
5 | ||
6 | static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; | |
7 | static int ir_ioapic_num; | |
8 | ||
9 | static int ir_parse_ioapic_scope(struct acpi_dmar_header *header, | |
10 | struct intel_iommu *iommu) | |
11 | { | |
12 | struct acpi_dmar_hardware_unit *drhd; | |
13 | struct acpi_dmar_device_scope *scope; | |
14 | void *start, *end; | |
15 | ||
16 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
17 | ||
18 | start = (void *)(drhd + 1); | |
19 | end = ((void *)drhd) + header->length; | |
20 | ||
21 | while (start < end) { | |
22 | scope = start; | |
23 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) { | |
24 | if (ir_ioapic_num == MAX_IO_APICS) { | |
25 | printk(KERN_WARNING "Exceeded Max IO APICS\n"); | |
26 | return -1; | |
27 | } | |
28 | ||
29 | printk(KERN_INFO "IOAPIC id %d under DRHD base" | |
30 | " 0x%Lx\n", scope->enumeration_id, | |
31 | drhd->address); | |
32 | ||
33 | ir_ioapic[ir_ioapic_num].iommu = iommu; | |
34 | ir_ioapic[ir_ioapic_num].id = scope->enumeration_id; | |
35 | ir_ioapic_num++; | |
36 | } | |
37 | start += scope->length; | |
38 | } | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | /* | |
44 | * Finds the assocaition between IOAPIC's and its Interrupt-remapping | |
45 | * hardware unit. | |
46 | */ | |
47 | int __init parse_ioapics_under_ir(void) | |
48 | { | |
49 | struct dmar_drhd_unit *drhd; | |
50 | int ir_supported = 0; | |
51 | ||
52 | for_each_drhd_unit(drhd) { | |
53 | struct intel_iommu *iommu = drhd->iommu; | |
54 | ||
55 | if (ecap_ir_support(iommu->ecap)) { | |
56 | if (ir_parse_ioapic_scope(drhd->hdr, iommu)) | |
57 | return -1; | |
58 | ||
59 | ir_supported = 1; | |
60 | } | |
61 | } | |
62 | ||
63 | if (ir_supported && ir_ioapic_num != nr_ioapics) { | |
64 | printk(KERN_WARNING | |
65 | "Not all IO-APIC's listed under remapping hardware\n"); | |
66 | return -1; | |
67 | } | |
68 | ||
69 | return ir_supported; | |
70 | } |