On Thu, 24 Feb 2022 at 13:58, Tomas Pilar (tpilar)
<quic_tpi...@quicinc.com> wrote:
>
> Move the logic that sets EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE Pci
>
> attribute to DriverBindingStart() before the memory that backs the
>
> DMA engine is allocated.
>
>
>
> This ensures that the DMA-backing memory is not forcibly allocated
>
> below 4G in system address map. Otherwise the allocation fails on
>
> platforms that do not have any memory below the 4G mark and the drive
>
> initialisation fails.
>
>
>
> Cc: Ray Ni <ray...@intel.com>
>
> Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
>
> Cc: Leif Lindholm <l...@nuviainc.com>
>
> Signed-off-by: Tomas Pilar <quic_tpi...@quicinc.com>
Ehm, nope, that is not exactly what I meant.
The existing code stores the original PCI attributes in the controller
private data, enables MMIO/IO decoding and bus mastering, and only
then sets the dual address cycle attribute.
All of that needs to move, so that the captured attributes are accurate.
>
> ---
>
> MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpress.c | 13 +++++++++++++
>
> MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressHci.c | 13 -------------
>
> 2 files changed, 13 insertions(+), 13 deletions(-)
>
>
>
> diff --git a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpress.c
> b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpress.c
>
> index 9d40f67e8e..1f0fc5bb68 100644
>
> --- a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpress.c
>
> +++ b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpress.c
>
> @@ -959,6 +959,19 @@ NvmExpressDriverBindingStart (
>
> goto Exit;
>
> }
>
>
>
> + //
>
> + // Enable 64-bit DMA support in the PCI layer.
>
> + //
>
> + Status = PciIo->Attributes (
>
> + PciIo,
>
> + EfiPciIoAttributeOperationEnable,
>
> + EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
>
> + NULL
>
> + );
>
> + if (EFI_ERROR (Status)) {
>
> + DEBUG ((DEBUG_WARN, "NvmeControllerInit: failed to enable 64-bit DMA
> (%r)\n", Status));
>
> + }
>
> +
>
> //
>
> // 6 x 4kB aligned buffers will be carved out of this buffer.
>
> // 1st 4kB boundary is the start of the admin submission queue.
>
> diff --git a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressHci.c
> b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressHci.c
>
> index ac77afe113..748cb0ba24 100644
>
> --- a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressHci.c
>
> +++ b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressHci.c
>
> @@ -764,19 +764,6 @@ NvmeControllerInit (
>
> return Status;
>
> }
>
>
>
> - //
>
> - // Enable 64-bit DMA support in the PCI layer.
>
> - //
>
> - Status = PciIo->Attributes (
>
> - PciIo,
>
> - EfiPciIoAttributeOperationEnable,
>
> - EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
>
> - NULL
>
> - );
>
> - if (EFI_ERROR (Status)) {
>
> - DEBUG ((DEBUG_WARN, "NvmeControllerInit: failed to enable 64-bit DMA
> (%r)\n", Status));
>
> - }
>
> -
>
> //
>
> // Read the Controller Capabilities register and verify that the NVM
> command set is supported
>
> //
>
> --
>
> 2.30.2
>
>
>
>
>
>
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