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 <[email protected]> --- MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c | 22 +++++++++++++++++++- MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h | 2 ++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c index 4798bea86061..cdff1c3b8849 100644 --- a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c +++ b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c @@ -125,7 +125,7 @@ XhcGetCapability ( Xhc = XHC_FROM_THIS (This); *MaxSpeed = EFI_USB_SPEED_SUPER; *PortNumber = (UINT8) (Xhc->HcSParams1.Data.MaxPorts); - *Is64BitCapable = (UINT8) (Xhc->HcCParams.Data.Ac64); + *Is64BitCapable = (UINT8) Xhc->Support64BitDma; DEBUG ((EFI_D_INFO, "XhcGetCapability: %d ports, 64 bit %d\n", *PortNumber, *Is64BitCapable)); gBS->RestoreTPL (OldTpl); @@ -2020,6 +2020,26 @@ XhcDriverBindingStart ( return EFI_OUT_OF_RESOURCES; } + // + // Enable 64-bit DMA support in the PCI layer if this controller + // supports it. + // + if ((Xhc->HcCParams.Data.Ac64) != 0) { + Status = PciIo->Attributes ( + PciIo, + EfiPciIoAttributeOperationEnable, + EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE, + NULL + ); + if (!EFI_ERROR (Status)) { + Xhc->Support64BitDma = TRUE; + } else { + DEBUG ((EFI_D_WARN, + "XhcDriverBindingStart: failed to enable 64-bit DMA on 64-bit capable controller @ %p (%r)\n", + Controller, Status)); + } + } + XhcSetBiosOwnership (Xhc); XhcResetHC (Xhc, XHC_RESET_TIMEOUT); diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h index 7999151b3fde..0f53bb0eff7c 100644 --- a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h +++ b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h @@ -256,6 +256,8 @@ struct _USB_XHCI_INSTANCE { // The array supports up to 255 devices, entry 0 is reserved and should not be used. // USB_DEV_CONTEXT UsbDevContext[256]; + + BOOLEAN Support64BitDma; // Whether 64 bit DMA may be used with this device }; -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
