Suresh Siddha | ad3ad3f | 2008-07-10 11:16:40 -0700 | [diff] [blame^] | 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 | } |