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PcAtChipsetPkg/PciHostBridgeDxe: Improve KVM FIFO I/O read/write performance

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KVM can substantially boost the speed of the rep insb/insw/insl
and rep outsb/outsw/outsl instructions by transferring up to
a page of data per VM trap.

This change adds assembly handling of the PCI Host Bridge
I/O FIFO Reads and Writes.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13424 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten
2012-06-01 17:07:00 +00:00
parent 2ea3b92055
commit 1fd376d979
7 changed files with 747 additions and 0 deletions
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46
PcAtChipsetPkg/PciHostBridgeDxe/PciRootBridgeIo.c
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@@ -13,6 +13,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PciHostBridge.h"
#include "IoFifo.h"
typedef struct {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR SpaceDesp[TypeMax];
@@ -994,6 +995,51 @@ RootBridgeIoIoRW (
InStride = mInStride[Width];
OutStride = mOutStride[Width];
OperationWidth = (EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH) (Width & 0x03);
#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
if (InStride == 0) {
if (Write) {
switch (OperationWidth) {
case EfiPciWidthUint8:
IoWriteFifo8 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
case EfiPciWidthUint16:
IoWriteFifo16 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
case EfiPciWidthUint32:
IoWriteFifo32 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
default:
//
// The RootBridgeIoCheckParameter call above will ensure that this
// path is not taken.
//
ASSERT (FALSE);
break;
}
} else {
switch (OperationWidth) {
case EfiPciWidthUint8:
IoReadFifo8 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
case EfiPciWidthUint16:
IoReadFifo16 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
case EfiPciWidthUint32:
IoReadFifo32 ((UINTN) Address, Count, Buffer);
return EFI_SUCCESS;
default:
//
// The RootBridgeIoCheckParameter call above will ensure that this
// path is not taken.
//
ASSERT (FALSE);
break;
}
}
}
#endif
for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
if (Write) {
switch (OperationWidth) {