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path: root/drivers/pci/dmar.c
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Diffstat (limited to 'drivers/pci/dmar.c')
-rw-r--r--drivers/pci/dmar.c49
1 files changed, 28 insertions, 21 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index bd2c01674f5e..f2c5eb6e78f7 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -289,6 +289,24 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
}
}
+/**
+ * dmar_table_detect - checks to see if the platform supports DMAR devices
+ */
+static int __init dmar_table_detect(void)
+{
+ acpi_status status = AE_OK;
+
+ /* if we could find DMAR table, then there are DMAR devices */
+ status = acpi_get_table(ACPI_SIG_DMAR, 0,
+ (struct acpi_table_header **)&dmar_tbl);
+
+ if (ACPI_SUCCESS(status) && !dmar_tbl) {
+ printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
+ status = AE_NOT_FOUND;
+ }
+
+ return (ACPI_SUCCESS(status) ? 1 : 0);
+}
/**
* parse_dmar_table - parses the DMA reporting table
@@ -300,6 +318,12 @@ parse_dmar_table(void)
struct acpi_dmar_header *entry_header;
int ret = 0;
+ /*
+ * Do it again, earlier dmar_tbl mapping could be mapped with
+ * fixed map.
+ */
+ dmar_table_detect();
+
dmar = (struct acpi_table_dmar *)dmar_tbl;
if (!dmar)
return -ENODEV;
@@ -430,30 +454,11 @@ int __init dmar_table_init(void)
return 0;
}
-/**
- * early_dmar_detect - checks to see if the platform supports DMAR devices
- */
-int __init early_dmar_detect(void)
-{
- acpi_status status = AE_OK;
-
- /* if we could find DMAR table, then there are DMAR devices */
- status = acpi_get_table(ACPI_SIG_DMAR, 0,
- (struct acpi_table_header **)&dmar_tbl);
-
- if (ACPI_SUCCESS(status) && !dmar_tbl) {
- printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
- status = AE_NOT_FOUND;
- }
-
- return (ACPI_SUCCESS(status) ? 1 : 0);
-}
-
void __init detect_intel_iommu(void)
{
int ret;
- ret = early_dmar_detect();
+ ret = dmar_table_detect();
#ifdef CONFIG_DMAR
{
@@ -479,14 +484,16 @@ void __init detect_intel_iommu(void)
" x2apic support\n");
dmar_disabled = 1;
- return;
+ goto end;
}
if (ret && !no_iommu && !iommu_detected && !swiotlb &&
!dmar_disabled)
iommu_detected = 1;
}
+end:
#endif
+ dmar_tbl = NULL;
}