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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.c61
1 files changed, 34 insertions, 27 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index e842e756308..8b29c307f1a 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -193,7 +193,7 @@ dmar_parse_dev(struct dmar_drhd_unit *dmaru)
{
struct acpi_dmar_hardware_unit *drhd;
static int include_all;
- int ret;
+ int ret = 0;
drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr;
@@ -212,7 +212,7 @@ dmar_parse_dev(struct dmar_drhd_unit *dmaru)
include_all = 1;
}
- if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all)) {
+ if (ret) {
list_del(&dmaru->list);
kfree(dmaru);
}
@@ -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;
@@ -373,10 +397,10 @@ dmar_find_matched_drhd_unit(struct pci_dev *dev)
int __init dmar_dev_scope_init(void)
{
- struct dmar_drhd_unit *drhd;
+ struct dmar_drhd_unit *drhd, *drhd_n;
int ret = -ENODEV;
- for_each_drhd_unit(drhd) {
+ list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) {
ret = dmar_parse_dev(drhd);
if (ret)
return ret;
@@ -384,8 +408,8 @@ int __init dmar_dev_scope_init(void)
#ifdef CONFIG_DMAR
{
- struct dmar_rmrr_unit *rmrr;
- for_each_rmrr_units(rmrr) {
+ struct dmar_rmrr_unit *rmrr, *rmrr_n;
+ list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {
ret = rmrr_parse_dev(rmrr);
if (ret)
return ret;
@@ -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;
}