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OvmfPkg: PciHostBridgeDxe: use private buffer in RootBridgeIoConfiguration() 

On output, the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Configuration() function
produces a pointer to a buffer of ACPI 2.0 resource descriptors:

  Resources  A pointer to the ACPI 2.0 resource descriptors that describe
             the current configuration of this PCI root bridge. The
             storage for the ACPI 2.0 resource descriptors is allocated by
             this function. The caller must treat the return buffer as
             read-only data, and the buffer must not be freed by the
             caller.

PciHostBridgeDxe currently provides this buffer in a structure with static
storage duration. If multiple root bridges existed in parallel, the
pointers returned by their Configuration() methods would point to the same
static storage. A later Configuration() call would overwrite the storage
pointed out by an earlier Configuration() call (which was possibly made
for a different, but still alive, root bridge.)

Fix this problem by embedding the configuration buffer in
PCI_ROOT_BRIDGE_INSTANCE.

While we're at it, correct some typos (Desp -> Desc), spell out a missing
pack(1) pragma, and improve formatting.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17960 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek 2015-07-14 12:02:20 +00:00 committed by lersek
parent 7ee9dc2321
commit 20f7840e3f
2 changed files with 25 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
OvmfPkg/PciHostBridgeDxe/PciHostBridge.h
View File

@ -581,6 +581,13 @@ typedef struct {
RES_STATUS Status;
} PCI_RES_NODE;
#pragma pack(1)
typedef struct {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR SpaceDesc[TypeMax];
EFI_ACPI_END_TAG_DESCRIPTOR EndDesc;
} RESOURCE_CONFIGURATION;
#pragma pack()
#define PCI_ROOT_BRIDGE_SIGNATURE SIGNATURE_32('e', '2', 'p', 'b')
typedef struct {
@ -609,6 +616,7 @@ typedef struct {
EFI_PCI_ROOT_BRIDGE_DEVICE_PATH DevicePath;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL Io;
RESOURCE_CONFIGURATION ConfigBuffer;
} PCI_ROOT_BRIDGE_INSTANCE;

32
OvmfPkg/PciHostBridgeDxe/PciRootBridgeIo.c
View File

@ -1,6 +1,7 @@
/** @file
PCI Root Bridge Io Protocol implementation
Copyright (C) 2015, Red Hat, Inc.
Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
@ -15,19 +16,18 @@
#include "PciHostBridge.h"
#include "IoFifo.h"
typedef struct {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR SpaceDesp[TypeMax];
EFI_ACPI_END_TAG_DESCRIPTOR EndDesp;
} RESOURCE_CONFIGURATION;
RESOURCE_CONFIGURATION Configuration = {
{{0x8A, 0x2B, 1, 0, 0, 0, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 0, 32, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 6, 32, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 0, 64, 0, 0, 0, 0},
{0x8A, 0x2B, 0, 0, 6, 64, 0, 0, 0, 0},
{0x8A, 0x2B, 2, 0, 0, 0, 0, 0, 0, 0}},
{0x79, 0}
STATIC
CONST
RESOURCE_CONFIGURATION mConfigurationTemplate = {
{
{ 0x8A, 0x2B, 1, 0, 0, 0, 0, 0, 0, 0 }, // SpaceDesc[TypeIo]
{ 0x8A, 0x2B, 0, 0, 0, 32, 0, 0, 0, 0 }, // SpaceDesc[TypeMem32]
{ 0x8A, 0x2B, 0, 0, 6, 32, 0, 0, 0, 0 }, // SpaceDesc[TypePMem32]
{ 0x8A, 0x2B, 0, 0, 0, 64, 0, 0, 0, 0 }, // SpaceDesc[TypeMem64]
{ 0x8A, 0x2B, 0, 0, 6, 64, 0, 0, 0, 0 }, // SpaceDesc[TypePMem64]
{ 0x8A, 0x2B, 2, 0, 0, 0, 0, 0, 0, 0 } // SpaceDesc[TypeBus]
},
{ 0x79, 0 } // EndDesc
};
//
@ -2607,12 +2607,14 @@ RootBridgeIoConfiguration (
UINTN Index;
PrivateData = DRIVER_INSTANCE_FROM_PCI_ROOT_BRIDGE_IO_THIS (This);
CopyMem (&PrivateData->ConfigBuffer, &mConfigurationTemplate,
sizeof mConfigurationTemplate);
for (Index = 0; Index < TypeMax; Index++) {
if (PrivateData->ResAllocNode[Index].Status == ResAllocated) {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Desc;
Desc = &Configuration.SpaceDesp[Index];
Desc = &PrivateData->ConfigBuffer.SpaceDesc[Index];
Desc->AddrRangeMin = PrivateData->ResAllocNode[Index].Base;
Desc->AddrRangeMax = PrivateData->ResAllocNode[Index].Base +
PrivateData->ResAllocNode[Index].Length - 1;
@ -2620,7 +2622,7 @@ RootBridgeIoConfiguration (
}
}
*Resources = &Configuration;
*Resources = &PrivateData->ConfigBuffer;
return EFI_SUCCESS;
}