[edk2-devel] [PATCH v3 17/17] OvmfPkg/PvScsiDxe: Enable device 64-bit DMA addresses

[Liran Alon]

Enable PCI dual-address cycle attribute to signal device
supports 64-bit DMA addresses.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567
Reviewed-by: Laszlo Ersek <lersek at redhat.com>
Signed-off-by: Liran Alon <liran.alon at oracle.com>
---
 OvmfPkg/PvScsiDxe/PvScsi.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/OvmfPkg/PvScsiDxe/PvScsi.c b/OvmfPkg/PvScsiDxe/PvScsi.c
index d7f0d3c8790c..0a66c98421a9 100644
--- a/OvmfPkg/PvScsiDxe/PvScsi.c
+++ b/OvmfPkg/PvScsiDxe/PvScsi.c
@@ -874,6 +874,29 @@ PvScsiSetPciAttributes (
     return Status;
   }
 
+  //
+  // Signal device supports 64-bit DMA addresses
+  //
+  Status = Dev->PciIo->Attributes (
+                         Dev->PciIo,
+                         EfiPciIoAttributeOperationEnable,
+                         EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
+                         NULL
+                         );
+  if (EFI_ERROR (Status)) {
+    //
+    // Warn user that device will only be using 32-bit DMA addresses.
+    //
+    // Note that this does not prevent the device/driver from working
+    // and therefore we only warn and continue as usual.
+    //
+    DEBUG ((
+      DEBUG_WARN,
+      "%a: failed to enable 64-bit DMA addresses\n",
+      __FUNCTION__
+      ));
+  }
+
   return EFI_SUCCESS;
 }
 
-- 
2.20.1


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