Re: [Xen-devel] [edk2] [PATCH RFC v2 1/7] MdeModulePkg: introduce PcdPciAllowFullEnumeration

["Kinney, Michael D" <michael.d.kinney@xxxxxxxxx>]

Jordan,

There is an alternate module already available.

        DuetPkg/PciBusNoEnumeration

The concept was to have a different implementation that was smaller and just 
produced PCI I/O handles for PCI devices that are already enumerated.

Thanks,

Mike

-----Original Message-----
From: Jordan Justen [mailto:jljusten@xxxxxxxxx] 
Sent: Sunday, November 24, 2013 2:05 PM
To: edk2-devel@xxxxxxxxxxxxxxxxxxxxx; Tian, Feng; Wei Liu
Cc: xen-devel
Subject: Re: [edk2] [PATCH RFC v2 1/7] MdeModulePkg: introduce 
PcdPciAllowFullEnumeration

Feng, what do you think of this change to MdeModulePkg?

Wei, How about PcdPciDisableBusEnumeration instead?

-Jordan

On Tue, Nov 19, 2013 at 12:38 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> Platforms such as Xen already enumerates PCI bridges and devices. Use
> this PCD to control EDK2 behavior.
>
> The default behavior is to allow full PCI enumeration. This is the same
> behavior as before this change.
>
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Cc: Laszlo Ersek <lersek@xxxxxxxxxx>
> ---
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c      |    5 ++++-
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf |    1 +
>  MdeModulePkg/MdeModulePkg.dec                |    3 +++
>  3 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c 
> b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
> index 5afbb82..49c204c 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
> @@ -284,7 +284,10 @@ PciBusDriverBindingStart (
>            );
>    }
>
> -  gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE 
> : TRUE));
> +  if (PcdGetBool (PcdPciAllowFullEnumeration))
> +    gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? 
> FALSE : TRUE));
> +  else
> +    gFullEnumeration = FALSE;
>
>    //
>    // Open Device Path Protocol for PCI root bridge
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf 
> b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
> index 34eb672..626ae99 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
> @@ -108,6 +108,7 @@
>    gEfiMdeModulePkgTokenSpaceGuid.PcdSrIovSupport
>    gEfiMdeModulePkgTokenSpaceGuid.PcdAriSupport
>    gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport
> +  gEfiMdeModulePkgTokenSpaceGuid.PcdPciAllowFullEnumeration
>
>  # [Event]
>  #   ##
> diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
> index b627eb1..274d2e5 100644
> --- a/MdeModulePkg/MdeModulePkg.dec
> +++ b/MdeModulePkg/MdeModulePkg.dec
> @@ -737,6 +737,9 @@
>    ## This PCD specifies whether the Multi Root I/O virtualization support.
>    gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport|FALSE|BOOLEAN|0x10000046
>
> +  ## This PCD specifies whether full PCI enumeration is allowed.
> +  
> gEfiMdeModulePkgTokenSpaceGuid.PcdPciAllowFullEnumeration|TRUE|BOOLEAN|0x10000048
> +
>  [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
>    ## Single root I/O virtualization virtual function memory BAR alignment
>    #  BITN set indicates 2 of n+12 power
> --
> 1.7.10.4
>
>
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