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authorLaszlo Ersek <lersek@redhat.com>2015-07-26 08:02:13 +0000
committerjljusten <jljusten@Edk2>2015-07-26 08:02:13 +0000
commit896352e5f2049ee70492e8dbf24db6baf128f94e (patch)
tree085c49369f215a4554e5168ca63d453365cf20f5 /OvmfPkg/Library/PlatformBdsLib
parentb88ac532a6ba69aaa84427d319f498372ad3abd8 (diff)
downloadedk2-platforms-896352e5f2049ee70492e8dbf24db6baf128f94e.tar.xz
OvmfPkg: PlatformBdsLib: signal End-of-Dxe event group
(Paraphrasing git commit 9cd7d3c5 / SVN r17713:) Currently, OvmfPkg fails to signal the End-of-Dxe event group when entering the BDS phase, which results in some loss of functionality, eg. variable reclaim in the variable driver, and the memory region splitting in the DXE core that belongs to the properties table feature specified in UEFI-2.5. As discussed on the edk2-devel mailing list here: http://thread.gmane.org/gmane.comp.bios.tianocore.devel/16088/focus=16109 it is up to the platform BDS to signal End-of-Dxe, since there may be platform specific ordering constraints with respect to the signalling of the event that are difficult to honor at the generic level. (OvmfPkg specifics:) (1) In OvmfPkg, we can't signal End-of-Dxe before PCI enumeration completes. According to the previous patch, that would trigger OvmfPkg/AcpiS3SaveDxe to save S3 state *before* the following chain of action happened: - PCI enumeration completes - ACPI tables are installed by OvmfPkg/AcpiPlatformDxe - the FACS table becomes available Since OvmfPkg/AcpiS3SaveDxe can only save S3 state once the FACS table is available, we must delay the End-of-Dxe signal until after PCI enumeration completes (ie. root bridges are connected). (2) Pre-patch, S3Ready() in OvmfPkg/AcpiS3SaveDxe is entered from BdsLibBootViaBootOption() [IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c]. After the patch, we enter S3Ready() earlier than that, by signaling End-of-Dxe in PlatformBdsPolicyBehavior(). The timing / location of this new call is correct as well, and the original call (that now becomes the chronologically second call) becomes a no-op: S3Ready() is protected against 2nd and later entries. Cc: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18035 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'OvmfPkg/Library/PlatformBdsLib')
-rw-r--r--OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c37
-rw-r--r--OvmfPkg/Library/PlatformBdsLib/BdsPlatform.h1
-rw-r--r--OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf3
3 files changed, 41 insertions, 0 deletions
diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
index de13c6b5c3..ce299875cd 100644
--- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
@@ -1163,6 +1163,27 @@ Returns:
}
+/**
+ Empty callback function executed when the EndOfDxe event group is signaled.
+
+ We only need this function because we'd like to signal EndOfDxe, and for that
+ we need to create an event, with a callback function.
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context The pointer to the notification function's context, which
+ is implementation-dependent.
+**/
+STATIC
+VOID
+EFIAPI
+OnEndOfDxe (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+}
+
+
VOID
EFIAPI
PlatformBdsPolicyBehavior (
@@ -1197,12 +1218,28 @@ Returns:
{
EFI_STATUS Status;
EFI_BOOT_MODE BootMode;
+ EFI_EVENT EndOfDxeEvent;
DEBUG ((EFI_D_INFO, "PlatformBdsPolicyBehavior\n"));
VisitAllInstancesOfProtocol (&gEfiPciRootBridgeIoProtocolGuid,
ConnectRootBridge, NULL);
+ //
+ // We can't signal End-of-Dxe earlier than this. Namely, End-of-Dxe triggers
+ // the preparation of S3 system information. That logic has a hard dependency
+ // on the presence of the FACS ACPI table. Since our ACPI tables are only
+ // installed after PCI enumeration completes, we must not trigger the S3 save
+ // earlier, hence we can't signal End-of-Dxe earlier.
+ //
+ Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK, OnEndOfDxe,
+ NULL /* NotifyContext */, &gEfiEndOfDxeEventGroupGuid,
+ &EndOfDxeEvent);
+ if (!EFI_ERROR (Status)) {
+ gBS->SignalEvent (EndOfDxeEvent);
+ gBS->CloseEvent (EndOfDxeEvent);
+ }
+
if (PcdGetBool (PcdOvmfFlashVariablesEnable)) {
DEBUG ((EFI_D_INFO, "PlatformBdsPolicyBehavior: not restoring NvVars "
"from disk since flash variables appear to be supported.\n"));
diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.h b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.h
index e3e950e4ae..b510178668 100644
--- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.h
+++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.h
@@ -59,6 +59,7 @@ Abstract:
#include <Guid/Mps.h>
#include <Guid/HobList.h>
#include <Guid/GlobalVariable.h>
+#include <Guid/EventGroup.h>
#include <OvmfPlatforms.h>
diff --git a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
index ce2972013d..c40871b673 100644
--- a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
+++ b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
@@ -65,3 +65,6 @@
[Protocols]
gEfiDecompressProtocolGuid
gEfiPciRootBridgeIoProtocolGuid
+
+[Guids]
+ gEfiEndOfDxeEventGroupGuid