Unable to Loacte EdkiiIoMmuProtocol.

Unable to Loacte EdkiiIoMmuProtocol.

[Amit kumar]

Hi.
I am trying to allocate a mem buffer above 4Gb address but the allocation
since i am unable to locate EdkiiIoMmuProtocol.

Status = gBS->LocateProtocol (&gEdkiiIoMmuProtocolGuid, NULL, (VOID **)&mIoMmuProtocol);
      Status = mIoMmuProtocol->AllocateBuffer (
                   mIoMmuProtocol,
                   MaxAllocateType,
                   EfiBootServicesData,
                   1,
                  HostAddress,
                  EDKII_IOMMU_ATTRIBUTE_DUAL_ADDRESS_CYCLE
                  );


can somebody tell me the right way to do it. ?


Best Regards
Amit Kumar

Re: Unable to Loacte EdkiiIoMmuProtocol.

[Yao, Jiewen]

You need include a driver to produce gEdkiiIoMmuProtocolGuid.

One sample is IntelSiliconPkg\Feature\VTd\IntelVTdDxe

Thank you
Yao Jiewen

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Amit
> kumar
> Sent: Monday, November 27, 2017 7:24 PM
> To: edk2-devel@lists.01.org
> Subject: [edk2] Unable to Loacte EdkiiIoMmuProtocol.
> 
> Hi.
> I am trying to allocate a mem buffer above 4Gb address but the allocation
> since i am unable to locate EdkiiIoMmuProtocol.
> 
> Status = gBS->LocateProtocol (&gEdkiiIoMmuProtocolGuid, NULL, (VOID
> **)&mIoMmuProtocol);
>       Status = mIoMmuProtocol->AllocateBuffer (
>                    mIoMmuProtocol,
>                    MaxAllocateType,
>                    EfiBootServicesData,
>                    1,
>                   HostAddress,
>                   EDKII_IOMMU_ATTRIBUTE_DUAL_ADDRESS_CYCLE
>                   );
> 
> 
> can somebody tell me the right way to do it. ?
> 
> 
> Best Regards
> Amit Kumar
> 
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel

Re: Unable to Loacte EdkiiIoMmuProtocol.

[Andrew Fish]

Should drivers call gEdkiiIoMmuProtocolGuid directly or just use PciIo Protocol? 

Thanks,

Andrew Fish


> On Nov 27, 2017, at 3:24 AM, Amit kumar <akamit91@hotmail.com> wrote:
> 
> Hi.
> I am trying to allocate a mem buffer above 4Gb address but the allocation
> since i am unable to locate EdkiiIoMmuProtocol.
> 
> Status = gBS->LocateProtocol (&gEdkiiIoMmuProtocolGuid, NULL, (VOID **)&mIoMmuProtocol);
>      Status = mIoMmuProtocol->AllocateBuffer (
>                   mIoMmuProtocol,
>                   MaxAllocateType,
>                   EfiBootServicesData,
>                   1,
>                  HostAddress,
>                  EDKII_IOMMU_ATTRIBUTE_DUAL_ADDRESS_CYCLE
>                  );
> 
> 
> can somebody tell me the right way to do it. ?
> 
> 
> Best Regards
> Amit Kumar
> 
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel