mirror of https://github.com/acidanthera/audk.git
818bc86aa7
SVN r16411 delayed ACPI table installation until PCI enumeration was complete, because on QEMU the ACPI-related fw_cfg files should have been downloaded only after PCI enumeration. Said commit implemented the dependency by tightening the module's depex. This patch replaces the EFI_PCI_ENUMERATION_COMPLETE_PROTOCOL depex with a matching protocol registration callback. The depex was static, and it could not handle dynamically discovered situations when the dependency would turn out invalid. Namely: - At the moment, the depex in "QemuFwCfgAcpiPlatformDxe.inf" assumes that "ArmPlatformPkg/ArmVirtualizationPkg/ArmVirtualizationQemu.dsc" lacks PCI support. However, PCI support is about to become run-time discoverable on that platform. If PCI support is missing, then ArmVirtualizationPkg will set PcdPciDisableBusEnumeration to TRUE. Hence, when PcdPciDisableBusEnumeration is TRUE, we invalidate the dependency by not registering the callback and installing the ACPI tables right away. - InitializeXen() in "OvmfPkg/PlatformPei/Xen.c" sets PcdPciDisableBusEnumeration to TRUE. This causes PciBusDriverBindingStart() in "MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c" to set gFullEnumeration to FALSE, which in turn makes PciEnumerator() in "MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c" branch to PciEnumeratorLight(). The installation of EFI_PCI_ENUMERATION_COMPLETE_PROTOCOL at the end of PciEnumerator() is not reached. Which means that starting with SVN r16411, AcpiPlatformDxe is never dispatched on Xen. Hence, when PcdPciDisableBusEnumeration is TRUE, we invalidate the dependency by not registering the callback and installing the ACPI tables right away. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> [jordan.l.justen@intel.com: Removed PcdOvmfPciEnabled] Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16887 6f19259b-4bc3-4df7-8a09-765794883524 |
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| .. | ||
| AcpiPlatform.c | ||
| AcpiPlatform.h | ||
| AcpiPlatformDxe.inf | ||
| EntryPoint.c | ||
| Qemu.c | ||
| QemuFwCfgAcpi.c | ||
| QemuFwCfgAcpiPlatform.c | ||
| QemuFwCfgAcpiPlatformDxe.inf | ||
| QemuLoader.h | ||
| Xen.c | ||