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/Ata/AtaAtapiPassThru/AhciMode.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) 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. // -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
