Re: [PATCH v3] UefiPayloadPkg/UefiPayloadEntry: Improve bootloader memrange parsing


Guo Dong
 

Reviewed-by: Guo Dong <guo.dong@intel.com>

-----Original Message-----
From: Patrick Rudolph <patrick.rudolph@9elements.com>
Sent: Monday, June 21, 2021 1:10 AM
To: devel@edk2.groups.io
Cc: Ma, Maurice <maurice.ma@intel.com>; Dong, Guo
<guo.dong@intel.com>; You, Benjamin <benjamin.you@intel.com>
Subject: [PATCH v3] UefiPayloadPkg/UefiPayloadEntry: Improve bootloader
memrange parsing

Currently several DXE crash due to invalid memory resource settings.
The PciHostBridgeDxe which expects the MMCONF and PCI Aperature
to be EfiMemoryMappedIO, but currently those regions are (partly)
mapped as EfiReservedMemoryType.

coreboot and slimbootloader provide an e820 compatible memory map,
which doesn't work well with EDK2 as the e820 spec is missing MMIO regions.
In e820 'reserved' could either mean "DRAM used by boot firmware" or
"MMIO
in use and not detectable by OS".

Guess Top of lower usable DRAM (TOLUD) by walking the bootloader
provided
memory ranges. Memory types of RAM, ACPI and ACPI NVS below 4 GiB are
used
to increment TOLUD and reserved memory ranges touching TOLUD at the
base
are also assumed to be reserved DRAM, which increment TOLUD.

Then mark everything reserved below TOLUD as EfiReservedMemoryType
and
everything reserved above TOLUD as EfiMemoryMappedIO.

This fixes assertions seen in PciHostBridgeDxe.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
---
.../UefiPayloadEntry/UefiPayloadEntry.c | 190 +++++++++++++++++-
.../UefiPayloadEntry/UefiPayloadEntry.h | 10 +
2 files changed, 197 insertions(+), 3 deletions(-)

diff --git a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
index 805f5448d9..04c58f776c 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
+++ b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
@@ -7,10 +7,159 @@


#include "UefiPayloadEntry.h"



+STATIC UINT32 mTopOfLowerUsableDram = 0;

+

/**

Callback function to build resource descriptor HOB



This function build a HOB based on the memory map entry info.

+ It creates only EFI_RESOURCE_MEMORY_MAPPED_IO and
EFI_RESOURCE_MEMORY_RESERVED

+ resources.

+

+ @param MemoryMapEntry Memory map entry info got from
bootloader.

+ @param Params A pointer to ACPI_BOARD_INFO.

+

+ @retval EFI_SUCCESS Successfully build a HOB.

+ @retval EFI_INVALID_PARAMETER Invalid parameter provided.

+**/

+EFI_STATUS

+MemInfoCallbackMmio (

+ IN MEMROY_MAP_ENTRY *MemoryMapEntry,

+ IN VOID *Params

+ )

+{

+ EFI_PHYSICAL_ADDRESS Base;

+ EFI_RESOURCE_TYPE Type;

+ UINT64 Size;

+ EFI_RESOURCE_ATTRIBUTE_TYPE Attribue;

+ ACPI_BOARD_INFO *AcpiBoardInfo;

+

+ AcpiBoardInfo = (ACPI_BOARD_INFO *)Params;

+ if (AcpiBoardInfo == NULL) {

+ return EFI_INVALID_PARAMETER;

+ }

+

+ //

+ // Skip types already handled in MemInfoCallback

+ //

+ if (MemoryMapEntry->Type == E820_RAM || MemoryMapEntry->Type ==
E820_ACPI) {

+ return EFI_SUCCESS;

+ }

+

+ if (MemoryMapEntry->Base == AcpiBoardInfo->PcieBaseAddress) {

+ //

+ // MMCONF is always MMIO

+ //

+ Type = EFI_RESOURCE_MEMORY_MAPPED_IO;

+ } else if (MemoryMapEntry->Base < mTopOfLowerUsableDram) {

+ //

+ // It's in DRAM and thus must be reserved

+ //

+ Type = EFI_RESOURCE_MEMORY_RESERVED;

+ } else if ((MemoryMapEntry->Base < 0x100000000ULL) &&
(MemoryMapEntry->Base >= mTopOfLowerUsableDram)) {

+ //

+ // It's not in DRAM, must be MMIO

+ //

+ Type = EFI_RESOURCE_MEMORY_MAPPED_IO;

+ } else {

+ Type = EFI_RESOURCE_MEMORY_RESERVED;

+ }

+

+ Base = MemoryMapEntry->Base;

+ Size = MemoryMapEntry->Size;

+

+ Attribue = EFI_RESOURCE_ATTRIBUTE_PRESENT |

+ EFI_RESOURCE_ATTRIBUTE_INITIALIZED |

+ EFI_RESOURCE_ATTRIBUTE_TESTED |

+ EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |

+ EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |

+ EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |

+ EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE;

+

+ BuildResourceDescriptorHob (Type, Attribue,
(EFI_PHYSICAL_ADDRESS)Base, Size);

+ DEBUG ((DEBUG_INFO , "buildhob: base = 0x%lx, size = 0x%lx, type =
0x%x\n", Base, Size, Type));

+

+ if (MemoryMapEntry->Type == E820_UNUSABLE ||

+ MemoryMapEntry->Type == E820_DISABLED) {

+ BuildMemoryAllocationHob (Base, Size, EfiUnusableMemory);

+ } else if (MemoryMapEntry->Type == E820_PMEM) {

+ BuildMemoryAllocationHob (Base, Size, EfiPersistentMemory);

+ }

+

+ return EFI_SUCCESS;

+}

+

+

+/**

+ Callback function to find TOLUD (Top of Lower Usable DRAM)

+

+ Estimate where TOLUD (Top of Lower Usable DRAM) resides. The exact
position

+ would require platform specific code.

+

+ @param MemoryMapEntry Memory map entry info got from
bootloader.

+ @param Params Not used for now.

+

+ @retval EFI_SUCCESS Successfully updated
mTopOfLowerUsableDram.

+**/

+EFI_STATUS

+FindToludCallback (

+ IN MEMROY_MAP_ENTRY *MemoryMapEntry,

+ IN VOID *Params

+ )

+{

+ //

+ // This code assumes that the memory map on this x86 machine below
4GiB is continous

+ // until TOLUD. In addition it assumes that the bootloader provided
memory tables have

+ // no "holes" and thus the first memory range not covered by e820 marks
the end of

+ // usable DRAM. In addition it's assumed that every reserved memory
region touching

+ // usable RAM is also covering DRAM, everything else that is marked
reserved thus must be

+ // MMIO not detectable by bootloader/OS

+ //

+

+ //

+ // Skip memory types not RAM or reserved

+ //

+ if ((MemoryMapEntry->Type == E820_UNUSABLE) || (MemoryMapEntry-
Type == E820_DISABLED) ||
+ (MemoryMapEntry->Type == E820_PMEM)) {

+ return EFI_SUCCESS;

+ }

+

+ //

+ // Skip resources above 4GiB

+ //

+ if ((MemoryMapEntry->Base + MemoryMapEntry->Size) >
0x100000000ULL) {

+ return EFI_SUCCESS;

+ }

+

+ if ((MemoryMapEntry->Type == E820_RAM) || (MemoryMapEntry->Type
== E820_ACPI) ||

+ (MemoryMapEntry->Type == E820_NVS)) {

+ //

+ // It's usable DRAM. Update TOLUD.

+ //

+ if (mTopOfLowerUsableDram < (MemoryMapEntry->Base +
MemoryMapEntry->Size)) {

+ mTopOfLowerUsableDram = (UINT32)(MemoryMapEntry->Base +
MemoryMapEntry->Size);

+ }

+ } else {

+ //

+ // It might be 'reserved DRAM' or 'MMIO'.

+ //

+ // If it touches usable DRAM at Base assume it's DRAM as well,

+ // as it could be bootloader installed tables, TSEG, GTT, ...

+ //

+ if (mTopOfLowerUsableDram == MemoryMapEntry->Base) {

+ mTopOfLowerUsableDram = (UINT32)(MemoryMapEntry->Base +
MemoryMapEntry->Size);

+ }

+ }

+

+ return EFI_SUCCESS;

+}

+

+

+/**

+ Callback function to build resource descriptor HOB

+

+ This function build a HOB based on the memory map entry info.

+ Only add EFI_RESOURCE_SYSTEM_MEMORY.



@param MemoryMapEntry Memory map entry info got from
bootloader.

@param Params Not used for now.

@@ -28,7 +177,16 @@ MemInfoCallback (
UINT64 Size;

EFI_RESOURCE_ATTRIBUTE_TYPE Attribue;



- Type = (MemoryMapEntry->Type == 1) ?
EFI_RESOURCE_SYSTEM_MEMORY : EFI_RESOURCE_MEMORY_RESERVED;

+ //

+ // Skip everything not known to be usable DRAM.

+ // It will be added later.

+ //

+ if ((MemoryMapEntry->Type != E820_RAM) && (MemoryMapEntry-
Type != E820_ACPI) &&
+ (MemoryMapEntry->Type != E820_NVS)) {

+ return RETURN_SUCCESS;

+ }

+

+ Type = EFI_RESOURCE_SYSTEM_MEMORY;

Base = MemoryMapEntry->Base;

Size = MemoryMapEntry->Size;



@@ -40,7 +198,7 @@ MemInfoCallback (
EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |

EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE;



- if (Base >= BASE_4GB ) {

+ if (Base >= BASE_4GB) {

// Remove tested attribute to avoid DXE core to dispatch driver to memory
above 4GB

Attribue &= ~EFI_RESOURCE_ATTRIBUTE_TESTED;

}

@@ -48,6 +206,12 @@ MemInfoCallback (
BuildResourceDescriptorHob (Type, Attribue,
(EFI_PHYSICAL_ADDRESS)Base, Size);

DEBUG ((DEBUG_INFO , "buildhob: base = 0x%lx, size = 0x%lx, type =
0x%x\n", Base, Size, Type));



+ if (MemoryMapEntry->Type == E820_ACPI) {

+ BuildMemoryAllocationHob (Base, Size, EfiACPIReclaimMemory);

+ } else if (MemoryMapEntry->Type == E820_NVS) {

+ BuildMemoryAllocationHob (Base, Size, EfiACPIMemoryNVS);

+ }

+

return RETURN_SUCCESS;

}



@@ -236,8 +400,19 @@ BuildHobFromBl (
EFI_PEI_GRAPHICS_DEVICE_INFO_HOB *NewGfxDeviceInfo;



//

- // Parse memory info and build memory HOBs

+ // First find TOLUD

+ //

+ DEBUG ((DEBUG_INFO , "Guessing Top of Lower Usable DRAM:\n"));

+ Status = ParseMemoryInfo (FindToludCallback, NULL);

+ if (EFI_ERROR(Status)) {

+ return Status;

+ }

+ DEBUG ((DEBUG_INFO , "Assuming TOLUD = 0x%x\n",
mTopOfLowerUsableDram));

+

+ //

+ // Parse memory info and build memory HOBs for Usable RAM

//

+ DEBUG ((DEBUG_INFO , "Building ResourceDescriptorHobs for usable
memory:\n"));

Status = ParseMemoryInfo (MemInfoCallback, NULL);

if (EFI_ERROR(Status)) {

return Status;

@@ -289,6 +464,15 @@ BuildHobFromBl (
DEBUG ((DEBUG_INFO, "Create acpi board info guid hob\n"));

}



+ //

+ // Parse memory info and build memory HOBs for reserved DRAM and
MMIO

+ //

+ DEBUG ((DEBUG_INFO , "Building ResourceDescriptorHobs for reserved
memory:\n"));

+ Status = ParseMemoryInfo (MemInfoCallbackMmio, &AcpiBoardInfo);

+ if (EFI_ERROR(Status)) {

+ return Status;

+ }

+

//

// Parse platform specific information.

//

diff --git a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
index 2c84d6ed53..4fd50e47cd 100644
--- a/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
+++ b/UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.h
@@ -38,6 +38,16 @@
#define GET_OCCUPIED_SIZE(ActualSize, Alignment) \

((ActualSize) + (((Alignment) - ((ActualSize) & ((Alignment) - 1))) &
((Alignment) - 1)))



+

+#define E820_RAM 1

+#define E820_RESERVED 2

+#define E820_ACPI 3

+#define E820_NVS 4

+#define E820_UNUSABLE 5

+#define E820_DISABLED 6

+#define E820_PMEM 7

+#define E820_UNDEFINED 8

+

/**

Auto-generated function that calls the library constructors for all of the
module's

dependent libraries.

--
2.30.2

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