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path: root/drivers/acpi/arm64/iort.c
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Diffstat (limited to 'drivers/acpi/arm64/iort.c')
-rw-r--r--drivers/acpi/arm64/iort.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 4c745a26226b..1f7e4c691d9e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1218,6 +1218,17 @@ static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node)
return pci_rc->ats_attribute & ACPI_IORT_ATS_SUPPORTED;
}
+static bool iort_pci_rc_supports_canwbs(struct acpi_iort_node *node)
+{
+ struct acpi_iort_memory_access *memory_access;
+ struct acpi_iort_root_complex *pci_rc;
+
+ pci_rc = (struct acpi_iort_root_complex *)node->node_data;
+ memory_access =
+ (struct acpi_iort_memory_access *)&pci_rc->memory_properties;
+ return memory_access->memory_flags & ACPI_IORT_MF_CANWBS;
+}
+
static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
u32 streamid)
{
@@ -1335,6 +1346,8 @@ int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
fwspec = dev_iommu_fwspec_get(dev);
if (fwspec && iort_pci_rc_supports_ats(node))
fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
+ if (fwspec && iort_pci_rc_supports_canwbs(node))
+ fwspec->flags |= IOMMU_FWSPEC_PCI_RC_CANWBS;
} else {
node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
iort_match_node_callback, dev);