ArmVirtPkg: undo bogus component name and driver diagnostics disablement

The entry point function of any UEFI_DRIVER that conforms to the UEFI
driver model must install an instance of the EFI_DRIVER_BINDING_PROTOCOL
on the image handle. Beyond that, the following protocols are optional:

- EFI_COMPONENT_NAME_PROTOCOL
- EFI_COMPONENT_NAME2_PROTOCOL
- EFI_DRIVER_CONFIGURATION_PROTOCOL
- EFI_DRIVER_CONFIGURATION2_PROTOCOL
- EFI_DRIVER_DIAGNOSTICS_PROTOCOL
- EFI_DRIVER_DIAGNOSTICS2_PROTOCOL

The UefiLib functions

- EfiLibInstallAllDriverProtocols()
- EfiLibInstallAllDriverProtocols2()
- EfiLibInstallDriverBindingComponentName2()

are convenience helpers for such UEFI_DRIVERs. They simplify the
installation of the above protocols.

The UefiLib instance in "MdePkg/Library/UefiLib/UefiDriverModel.c" allows
platforms to control these functions through the MdePkg feature PCDs

- PcdComponentNameDisable
- PcdComponentName2Disable
- PcdDriverDiagnosticsDisable
- PcdDriverDiagnostics2Disable

If any of these PCDs are set to TRUE, then the helper functions will not
install the corresponding protocol interfaces on the image handle, even if
the driver passes in non-NULL protocol interfaces.

In other words, at build time, a platform can forcibly prevent all drivers
that employ UefiLib from producing these protocols.

In ArmVirtPkg, that's what we've been doing forever, for no reason at all.
This is why we haven't been seeing component and driver names from the DH,
DEVICES, DRIVERS and DEVTREE shell commands, unlike in OvmfPkg.

The default value for all these PCDs is FALSE, in "MdePkg/MdePkg.dec".
Revert ArmVirtPkg to the sane defaults.

This bug dates back to the inception of ArmVirtPkg (called
ArmPlatformPkg/ArmVirtualizationPkg at the time).

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Fixes: 6f5872b1f4013f58c6d2f446d885edd6c8ea6d21
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

diff --git a/ArmVirtPkg/ArmVirt.dsc.inc b/ArmVirtPkg/ArmVirt.dsc.inc
index c624b3cdbecd3d5b2361278a56ae2855301dc900..c071988ad8f5f624177b6a7d3e36e8d765b1e71f 100644 (file)
--- a/ArmVirtPkg/ArmVirt.dsc.inc
+++ b/ArmVirtPkg/ArmVirt.dsc.inc
@@ -254,10 +254,6 @@
 \r
 [PcdsFeatureFlag.common]\r
   gEfiMdeModulePkgTokenSpaceGuid.PcdHiiOsRuntimeSupport|FALSE\r
-  gEfiMdePkgTokenSpaceGuid.PcdComponentNameDisable|TRUE\r
-  gEfiMdePkgTokenSpaceGuid.PcdDriverDiagnosticsDisable|TRUE\r
-  gEfiMdePkgTokenSpaceGuid.PcdComponentName2Disable|TRUE\r
-  gEfiMdePkgTokenSpaceGuid.PcdDriverDiagnostics2Disable|TRUE\r
 \r
   #\r
   # Control what commands are supported from the UI\r