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PrmPkg: Add ALLOCATE_CONTEXT_BUFFER_IN_FW build option

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There's currently two approaches being considered for how to allocate the
context buffer passed to PRM handlers:

1. The context buffer is allocated and populated in firmware. As such, the
   FW converts all pointers internal to the buffer to virtual memory
   addresses at the virtual address change event. A single context buffer
   pointer is given to the OS via the PRM ACPI table and the OS converts
   this single physical address to a virtual address when it passes the
   context buffer as a pointer to PRM handlers.

2. The context buffer is allocated and populated in the OS. The OS gets
   all the information needed to populate the context buffer from other
   pre-existing resources (mainly physical addresses in the PRM ACPI
   table). The OS converts all the physical addresses to virtual addresses,
   allocates the context buffer instances, and fills in the information.
   The OS passes the context buffer virtual address to PRM handlers.

The prior behavior was (1). The current POR behavior has moved to (2).
Until (2) is used more widely, it can be kept around with fairly minimal
overhead via a build flag in a few places.

So the default behavior is now (2) (the expected permanent behavior) with
(1) easily enabled by defining "ALLOCATE_CONTEXT_BUFFER_IN_FW" in the
compiler defined macros. A DSC define was added in PrmPkg.dsc to set this
compiler macro in the package  build.

At some point in the future, all code (and some peripheral code)
surrounded with this build flag can be removed if (2) is fully
decided upon.

Cc: Andrew Fish <afish@apple.com>
Cc: Kang Gao <kang.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>
This commit is contained in:
Michael Kubacki
2020-04-13 16:38:19 -07:00
committed by mergify[bot]
parent d2cb6e67a4
commit e846797662
6 changed files with 76 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
PrmPkg/PrmConfigDxe/PrmConfigDxe.c
View File

@@ -28,8 +28,8 @@
STATIC UINTN mMaxRuntimeMmioRangeCount;
STATIC UINTN mMaxStaticDataBufferCount;
STATIC PRM_RUNTIME_MMIO_RANGES **mRuntimeMmioRanges;
STATIC PRM_DATA_BUFFER ***mStaticDataBuffers;
GLOBAL_REMOVE_IF_UNREFERENCED STATIC PRM_RUNTIME_MMIO_RANGES **mRuntimeMmioRanges;
GLOBAL_REMOVE_IF_UNREFERENCED STATIC PRM_DATA_BUFFER ***mStaticDataBuffers;
/**
Converts the runtime memory range physical addresses to virtual addresses.
@@ -178,32 +178,23 @@ StoreVirtualMemoryAddressChangePointers (
)
{
EFI_STATUS Status;
UINTN BufferIndex;
UINTN HandleCount;
UINTN HandleIndex;
UINTN RangeIndex;
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
UINTN BufferIndex;
UINTN StaticDataBufferIndex;
PRM_CONTEXT_BUFFER *CurrentContextBuffer;
#endif
EFI_HANDLE *HandleBuffer;
PRM_CONFIG_PROTOCOL *PrmConfigProtocol;
PRM_CONTEXT_BUFFER *CurrentContextBuffer;
DEBUG ((DEBUG_INFO, "%a %a - Entry.\n", _DBGMSGID_, __FUNCTION__));
RangeIndex = 0;
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
StaticDataBufferIndex = 0;
mRuntimeMmioRanges = AllocateRuntimeZeroPool (sizeof (*mRuntimeMmioRanges) * mMaxRuntimeMmioRangeCount);
if (mRuntimeMmioRanges == NULL && mMaxRuntimeMmioRangeCount > 0) {
DEBUG ((
DEBUG_ERROR,
" %a %a: Memory allocation for runtime MMIO pointer array failed.\n",
_DBGMSGID_,
__FUNCTION__
));
ASSERT (FALSE);
return;
}
mStaticDataBuffers = AllocateRuntimeZeroPool (sizeof (*mStaticDataBuffers) * mMaxStaticDataBufferCount);
if (mStaticDataBuffers == NULL && mMaxStaticDataBufferCount > 0) {
DEBUG ((
@@ -215,6 +206,19 @@ StoreVirtualMemoryAddressChangePointers (
ASSERT (FALSE);
return;
}
#endif
mRuntimeMmioRanges = AllocateRuntimeZeroPool (sizeof (*mRuntimeMmioRanges) * mMaxRuntimeMmioRangeCount);
if (mRuntimeMmioRanges == NULL && mMaxRuntimeMmioRangeCount > 0) {
DEBUG ((
DEBUG_ERROR,
" %a %a: Memory allocation for runtime MMIO pointer array failed.\n",
_DBGMSGID_,
__FUNCTION__
));
ASSERT (FALSE);
return;
}
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
@@ -236,6 +240,7 @@ StoreVirtualMemoryAddressChangePointers (
continue;
}
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
for (BufferIndex = 0; BufferIndex < PrmConfigProtocol->ModuleContextBuffers.BufferCount; BufferIndex++) {
CurrentContextBuffer = &(PrmConfigProtocol->ModuleContextBuffers.Buffer[BufferIndex]);
@@ -256,6 +261,7 @@ StoreVirtualMemoryAddressChangePointers (
mStaticDataBuffers[StaticDataBufferIndex++] = &CurrentContextBuffer->StaticDataBuffer;
}
}
#endif
if (PrmConfigProtocol->ModuleContextBuffers.RuntimeMmioRanges != NULL) {
if (RangeIndex >= mMaxRuntimeMmioRangeCount) {
Status = EFI_BUFFER_TOO_SMALL;
@@ -280,6 +286,7 @@ StoreVirtualMemoryAddressChangePointers (
__FUNCTION__,
RangeIndex
));
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
DEBUG ((
DEBUG_INFO,
" %a %a: %d static buffers saved for future virtual memory conversion.\n",
@@ -287,6 +294,7 @@ StoreVirtualMemoryAddressChangePointers (
__FUNCTION__,
StaticDataBufferIndex
));
#endif
}
}
@@ -388,12 +396,14 @@ PrmConfigVirtualAddressChangeEvent (
{
UINTN Index;
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
//
// Convert static data buffer pointers
//
for (Index = 0; Index < mMaxStaticDataBufferCount; Index++) {
gRT->ConvertPointer (0x0, (VOID **) mStaticDataBuffers[Index]);
}
#endif
//
// Convert runtime MMIO ranges
@@ -484,7 +494,7 @@ PrmConfigEndOfDxeNotification (
if (PrmConfigProtocol->ModuleContextBuffers.RuntimeMmioRanges != NULL) {
DEBUG ((
DEBUG_INFO,
" %a %a: Found %d PRM runtime MMIO ranges to convert.\n",
" %a %a: Found %d PRM runtime MMIO ranges.\n",
_DBGMSGID_,
__FUNCTION__,
PrmConfigProtocol->ModuleContextBuffers.RuntimeMmioRanges->Count
@@ -541,6 +551,13 @@ PrmConfigEntryPoint (
);
ASSERT_EFI_ERROR (Status);
DEBUG ((DEBUG_INFO, " %a %a: Context buffers will be allocated in ", _DBGMSGID_, __FUNCTION__));
#ifdef ALLOCATE_CONTEXT_BUFFER_IN_FW
DEBUG ((DEBUG_INFO, "firmware.\n"));
#else
DEBUG ((DEBUG_INFO, "the operating system.\n"));
#endif
//
// Register a notification function for virtual address change
//