Re: [PATCH] ArmPkg: Enable boot discovery policy for ARM package.

["Ard Biesheuvel" <ardb@kernel.org>]

On Wed, 11 Aug 2021 at 13:57, Ard Biesheuvel <ardb@kernel.org> wrote:
>
> On Tue, 10 Aug 2021 at 17:23, Sunny Wang <Sunny.Wang@arm.com> wrote:
> >
> > Hi Ard,
> >
> > Yeah, this is a good point. Greg and I offline discussed this as well.
> > If we don't miss anything, only applying this patch without platform changes should be fine. There should be no behavior change. I added some details below for your reference.
> >   - if the platform doesn’t add PcdBootDiscoveryPolicy to platform's dsc file and add BootDiscoveryPolicyUiLib to UiApp. BootDiscoveryPolicyHandler() would just get PcdBootDiscoveryPolicy default value and do nothing.
> >   - if the platform doesn't include BootManagerPolicyDxe driver or produce EfiBootManagerPolicyProtocol, BootDiscoveryPolicyHandler() would just return with only printing a message to remind users/developers that Boot Discovery Policy doesn't work (driver connect will be skipped).
> >
>
> OK, thanks for double checking.
>
> I tried to submit this but I get CI errors:

https://github.com/tianocore/edk2/pull/1895


>
>
>
> >
> > -----Original Message-----
> > From: Ard Biesheuvel <ardb@kernel.org>
> > Sent: Friday, August 6, 2021 9:45 PM
> > To: Grzegorz Bernacki <gjb@semihalf.com>
> > Cc: edk2-devel-groups-io <devel@edk2.groups.io>; Leif Lindholm <leif@nuviainc.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>; Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>; Sunny Wang <Sunny.Wang@arm.com>; Marcin Wojtas <mw@semihalf.com>; upstream@semihalf.com
> > Subject: Re: [PATCH] ArmPkg: Enable boot discovery policy for ARM package.
> >
> > On Fri, 6 Aug 2021 at 10:30, Grzegorz Bernacki <gjb@semihalf.com> wrote:
> > >
> > > This commit adds code which check BootDiscoveryPolicy variable and
> > > calls Boot Policy Manager Protocol to connect device specified by
> > > the variable. To enable that mechanism for platform
> > > EfiMdeModulePkgTokenSpaceGuid.PcdBootDiscoveryPolicy PCD must be
> > > added to DSC file and BootDiscoveryPolicyUiLib should be added to
> > > UiApp libraries.
> > >
> >
> > ... or the platform will be broken once we apply this patch, right? If
> > so, please propose patches for all platforms in edk2-platforms that
> > use this library - we can't just break them.
> >
> > > Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
> > > ---
> > >  ArmPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf |  5 +
> > >  ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c               | 96 +++++++++++++++++++-
> > >  2 files changed, 100 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/ArmPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf b/ArmPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
> > > index 353d7a967b..86751b45f8 100644
> > > --- a/ArmPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
> > > +++ b/ArmPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
> > > @@ -65,11 +65,15 @@
> > >
> > >  [Pcd]
> > >    gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut
> > > +  gEfiMdeModulePkgTokenSpaceGuid.PcdBootDiscoveryPolicy
> > >
> > >  [Guids]
> > > +  gBootDiscoveryPolicyMgrFormsetGuid
> > >    gEdkiiNonDiscoverableEhciDeviceGuid
> > >    gEdkiiNonDiscoverableUhciDeviceGuid
> > >    gEdkiiNonDiscoverableXhciDeviceGuid
> > > +  gEfiBootManagerPolicyNetworkGuid
> > > +  gEfiBootManagerPolicyConnectAllGuid
> > >    gEfiFileInfoGuid
> > >    gEfiFileSystemInfoGuid
> > >    gEfiFileSystemVolumeLabelInfoIdGuid
> > > @@ -79,6 +83,7 @@
> > >
> > >  [Protocols]
> > >    gEdkiiNonDiscoverableDeviceProtocolGuid
> > > +  gEfiBootManagerPolicyProtocolGuid
> > >    gEfiDevicePathProtocolGuid
> > >    gEfiGraphicsOutputProtocolGuid
> > >    gEfiLoadedImageProtocolGuid
> > > diff --git a/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c b/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
> > > index 5ceb23d822..4332c45bb7 100644
> > > --- a/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
> > > +++ b/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
> > > @@ -2,9 +2,10 @@
> > >    Implementation for PlatformBootManagerLib library class interfaces.
> > >
> > >    Copyright (C) 2015-2016, Red Hat, Inc.
> > > -  Copyright (c) 2014 - 2019, ARM Ltd. All rights reserved.<BR>
> > > +  Copyright (c) 2014 - 2021, ARM Ltd. All rights reserved.<BR>
> > >    Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
> > >    Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
> > > +  Copyright (c) 2021, Semihalf All rights reserved.<BR>
> > >
> > >    SPDX-License-Identifier: BSD-2-Clause-Patent
> > >
> > > @@ -19,6 +20,7 @@
> > >  #include <Library/UefiBootManagerLib.h>
> > >  #include <Library/UefiLib.h>
> > >  #include <Library/UefiRuntimeServicesTableLib.h>
> > > +#include <Protocol/BootManagerPolicy.h>
> > >  #include <Protocol/DevicePath.h>
> > >  #include <Protocol/EsrtManagement.h>
> > >  #include <Protocol/GraphicsOutput.h>
> > > @@ -27,6 +29,7 @@
> > >  #include <Protocol/PciIo.h>
> > >  #include <Protocol/PciRootBridgeIo.h>
> > >  #include <Protocol/PlatformBootManager.h>
> > > +#include <Guid/BootDiscoveryPolicy.h>
> > >  #include <Guid/EventGroup.h>
> > >  #include <Guid/NonDiscoverableDevice.h>
> > >  #include <Guid/TtyTerm.h>
> > > @@ -703,6 +706,91 @@ HandleCapsules (
> > >
> > >  #define VERSION_STRING_PREFIX    L"Tianocore/EDK2 firmware version "
> > >
> > > +/**
> > > +  This functions checks the value of BootDiscoverPolicy variable and
> > > +  connect devices of class specified by that variable. Then it refreshes
> > > +  Boot order for newly discovered boot device.
> > > +
> > > +  @retval  EFI_SUCCESS  Devices connected succesfully or connection
> > > +                        not required.
> > > +  @retval  others       Return values from GetVariable(), LocateProtocol()
> > > +                        and ConnectDeviceClass().
> > > +--*/
> > > +STATIC
> > > +EFI_STATUS
> > > +BootDiscoveryPolicyHandler (
> > > +  VOID
> > > +  )
> > > +{
> > > +  EFI_STATUS                       Status;
> > > +  UINT32                           DiscoveryPolicy;
> > > +  UINTN                            Size;
> > > +  EFI_BOOT_MANAGER_POLICY_PROTOCOL *BMPolicy;
> > > +  EFI_GUID                         *Class;
> > > +
> > > +  Size = sizeof (DiscoveryPolicy);
> > > +  Status = gRT->GetVariable (
> > > +                  BOOT_DISCOVERY_POLICY_VAR,
> > > +                  &gBootDiscoveryPolicyMgrFormsetGuid,
> > > +                  NULL,
> > > +                  &Size,
> > > +                  &DiscoveryPolicy
> > > +                  );
> > > +  if (Status == EFI_NOT_FOUND) {
> > > +    Status = PcdSet32S (PcdBootDiscoveryPolicy, PcdGet32 (PcdBootDiscoveryPolicy));
> > > +    if (Status == EFI_NOT_FOUND) {
> > > +      return EFI_SUCCESS;
> > > +    } else if (EFI_ERROR (Status)) {
> > > +      return Status;
> > > +    }
> > > +    DiscoveryPolicy = PcdGet32 (PcdBootDiscoveryPolicy);
> > > +  } else if (EFI_ERROR (Status)) {
> > > +    return Status;
> > > +  }
> > > +
> > > +  if (DiscoveryPolicy == BDP_CONNECT_MINIMAL) {
> > > +    return EFI_SUCCESS;
> > > +  }
> > > +
> > > +  switch (DiscoveryPolicy) {
> > > +    case BDP_CONNECT_NET:
> > > +      Class = &gEfiBootManagerPolicyNetworkGuid;
> > > +      break;
> > > +    case BDP_CONNECT_ALL:
> > > +      Class = &gEfiBootManagerPolicyConnectAllGuid;
> > > +      break;
> > > +    default:
> > > +      DEBUG ((
> > > +        DEBUG_INFO,
> > > +        "%a - Unexpected DiscoveryPolicy (0x%x). Run Minimal Discovery Policy\n",
> > > +        __FUNCTION__,
> > > +        DiscoveryPolicy
> > > +        ));
> > > +      return EFI_SUCCESS;
> > > +  }
> > > +
> > > +  Status = gBS->LocateProtocol (
> > > +                  &gEfiBootManagerPolicyProtocolGuid,
> > > +                  NULL,
> > > +                  (VOID **)&BMPolicy
> > > +                  );
> > > +  if (EFI_ERROR (Status)) {
> > > +    DEBUG ((DEBUG_INFO, "%a - Failed to locate gEfiBootManagerPolicyProtocolGuid."
> > > +      "Driver connect will be skipped.\n", __FUNCTION__));
> > > +    return Status;
> > > +  }
> > > +
> > > +  Status = BMPolicy->ConnectDeviceClass (BMPolicy, Class);
> > > +  if (EFI_ERROR (Status)){
> > > +    DEBUG ((DEBUG_ERROR, "%a - ConnectDeviceClass returns - %r\n", __FUNCTION__, Status));
> > > +    return Status;
> > > +  }
> > > +
> > > +  EfiBootManagerRefreshAllBootOption();
> > > +
> > > +  return EFI_SUCCESS;
> > > +}
> > > +
> > >  /**
> > >    Do the platform specific action after the console is ready
> > >    Possible things that can be done in PlatformBootManagerAfterConsole:
> > > @@ -753,6 +841,12 @@ PlatformBootManagerAfterConsole (
> > >      }
> > >    }
> > >
> > > +  //
> > > +  // Connect device specified by BootDiscoverPolicy variable and
> > > +  // refresh Boot order for newly discovered boot devices
> > > +  //
> > > +  BootDiscoveryPolicyHandler ();
> > > +
> > >    //
> > >    // On ARM, there is currently no reason to use the phased capsule
> > >    // update approach where some capsules are dispatched before EndOfDxe
> > > --
> > > 2.25.1
> > >
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