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[edk2,1/7] MdeModulePkg/AtaAtapiPassThru: enable 64-bit PCI DMA

Message ID 1473067049-16252-2-git-send-email-ard.biesheuvel@linaro.org
State Accepted
Commit a2c9b0873a7713df3d491307009b63ad0acd52f0
Headers show

Commit Message

Ard Biesheuvel Sept. 5, 2016, 9:17 a.m. UTC 
PCI controller drivers must set the EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE
attribute if the controller supports 64-bit DMA addressing.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

-- 
2.7.4

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diff mbox

Patch

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 469a40ac392a..68bce94810a6 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -2258,7 +2258,25 @@  AhciModeInitialization (
   if ((Capability & EFI_AHCI_CAP_SAM) == 0) {
     AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);
   }
-  
+
+  //
+  // Enable 64-bit DMA support in the PCI layer if this controller
+  // supports it.
+  //
+  if ((Capability & EFI_AHCI_CAP_S64A) != 0) {
+    Status = PciIo->Attributes (
+                      PciIo,
+                      EfiPciIoAttributeOperationEnable,
+                      EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
+                      NULL
+                      );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_WARN,
+        "AhciModeInitialization: failed to enable 64-bit DMA on 64-bit capable controller (%r)\n",
+        Status));
+    }
+  }
+
   //
   // Get the number of command slots per port supported by this HBA.
   //