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Diffstat (limited to 'arch/ia64/kernel/acpi.c')
-rw-r--r--arch/ia64/kernel/acpi.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 00936491933e..0635015d0aaa 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -92,6 +92,9 @@ acpi_get_sysname(void)
struct acpi_table_rsdp *rsdp;
struct acpi_table_xsdt *xsdt;
struct acpi_table_header *hdr;
+#ifdef CONFIG_DMAR
+ u64 i, nentries;
+#endif
rsdp_phys = acpi_find_rsdp();
if (!rsdp_phys) {
@@ -126,6 +129,18 @@ acpi_get_sysname(void)
return "xen";
}
+#ifdef CONFIG_DMAR
+ /* Look for Intel IOMMU */
+ nentries = (hdr->length - sizeof(*hdr)) /
+ sizeof(xsdt->table_offset_entry[0]);
+ for (i = 0; i < nentries; i++) {
+ hdr = __va(xsdt->table_offset_entry[i]);
+ if (strncmp(hdr->signature, ACPI_SIG_DMAR,
+ sizeof(ACPI_SIG_DMAR) - 1) == 0)
+ return "dig_vtd";
+ }
+#endif
+
return "dig";
#else
# if defined (CONFIG_IA64_HP_SIM)
@@ -142,6 +157,8 @@ acpi_get_sysname(void)
return "dig";
# elif defined (CONFIG_IA64_XEN_GUEST)
return "xen";
+# elif defined(CONFIG_IA64_DIG_VTD)
+ return "dig_vtd";
# else
# error Unknown platform. Fix acpi.c.
# endif