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ArmPkg/ArmDmaLib: Fix coherency issues in DmaLib 

Some coherencies issues were existing in the former version of DmaLib.
These issues could have for consequences to not make the MdeModulePkg/Bus/Usb
software stack not work.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12137 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin 2011-08-15 16:55:05 +00:00
parent 9201b04422
commit e6d572ba03
1 changed files with 42 additions and 32 deletions
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50
ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
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@ -13,9 +13,10 @@
**/
#include <Base.h>
#include <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/DmaLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UncachedMemoryAllocationLib.h>
@ -38,9 +39,6 @@ typedef struct {
EFI_CPU_ARCH_PROTOCOL *gCpu;
UINTN gCacheAlignment = 0;
/**
Provides the DMA controller-specific addresses needed to access system memory.
@ -74,13 +72,12 @@ DmaMap (
EFI_STATUS Status;
MAP_INFO_INSTANCE *Map;
VOID *Buffer;
EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
if ( HostAddress == NULL || NumberOfBytes == NULL ||
DeviceAddress == NULL || Mapping == NULL ) {
if (HostAddress == NULL || NumberOfBytes == NULL || DeviceAddress == NULL || Mapping == NULL ) {
return EFI_INVALID_PARAMETER;
}
if (Operation >= MapOperationMaximum) {
return EFI_INVALID_PARAMETER;
}
@ -97,6 +94,15 @@ DmaMap (
if ((((UINTN)HostAddress & (gCacheAlignment - 1)) != 0) ||
((*NumberOfBytes % gCacheAlignment) != 0)) {
// Get the cacheability of the region
Status = gDS->GetMemorySpaceDescriptor (HostAddress, &GcdDescriptor);
if (EFI_ERROR(Status)) {
return Status;
}
// If the mapped buffer is not an uncached buffer
if (GcdDescriptor.Attributes != EFI_MEMORY_UC) {
//
// If the buffer does not fill entire cache lines we must double buffer into
// uncached memory. Device (PCI) address becomes uncached page.
@ -107,28 +113,32 @@ DmaMap (
return Status;
}
*DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;
if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
CopyMem (Buffer, HostAddress, *NumberOfBytes);
}
*DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)Buffer;
} else {
Map->DoubleBuffer = FALSE;
}
} else {
Map->DoubleBuffer = FALSE;
// Flush the Data Cache (should not have any effect if the memory region is uncached)
gCpu->FlushDataCache (gCpu, *DeviceAddress, *NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);
if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
// In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached
Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_UC);
ASSERT_EFI_ERROR (Status);
}
}
Map->HostAddress = (UINTN)HostAddress;
Map->DeviceAddress = *DeviceAddress;
Map->NumberOfBytes = *NumberOfBytes;
Map->Operation = Operation;
if (Map->DoubleBuffer) {
if (Map->Operation == MapOperationBusMasterWrite) {
CopyMem ((VOID *)(UINTN)Map->DeviceAddress, (VOID *)(UINTN)Map->HostAddress, Map->NumberOfBytes);
}
} else {
// EfiCpuFlushTypeWriteBack, EfiCpuFlushTypeInvalidate
if (Map->Operation == MapOperationBusMasterWrite || Map->Operation == MapOperationBusMasterRead) {
gCpu->FlushDataCache (gCpu, (EFI_PHYSICAL_ADDRESS)(UINTN)HostAddress, Map->NumberOfBytes, EfiCpuFlushTypeWriteBackInvalidate);
}
}
return EFI_SUCCESS;
}
@ -159,7 +169,7 @@ DmaUnmap (
Map = (MAP_INFO_INSTANCE *)Mapping;
if (Map->DoubleBuffer) {
if (Map->Operation == MapOperationBusMasterRead) {
if ((Map->Operation == MapOperationBusMasterWrite) || (Map->Operation == MapOperationBusMasterCommonBuffer)) {
CopyMem ((VOID *)(UINTN)Map->HostAddress, (VOID *)(UINTN)Map->DeviceAddress, Map->NumberOfBytes);
}