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/** @file
The NvmExpressPei driver is used to manage non-volatile memory subsystem
which follows NVM Express specification at PEI phase.
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "NvmExpressPei.h"
#include <Guid/S3StorageDeviceInitList.h>
#include <Library/LockBoxLib.h>
/**
Determine if a specific NVM Express controller can be skipped for S3 phase.
@param[in] HcDevicePath Device path of the controller.
@param[in] HcDevicePathLength Length of the device path specified by
HcDevicePath.
@retval The number of ports that need to be enumerated.
**/
BOOLEAN
NvmeS3SkipThisController (
IN EFI_DEVICE_PATH_PROTOCOL *HcDevicePath,
IN UINTN HcDevicePathLength
)
{
EFI_STATUS Status;
UINT8 DummyData;
UINTN S3InitDevicesLength;
EFI_DEVICE_PATH_PROTOCOL *S3InitDevices;
EFI_DEVICE_PATH_PROTOCOL *DevicePathInst;
UINTN DevicePathInstLength;
BOOLEAN EntireEnd;
BOOLEAN Skip;
//
// From the LockBox, get the list of device paths for devices need to be
// initialized in S3.
//
S3InitDevices = NULL;
S3InitDevicesLength = sizeof (DummyData);
EntireEnd = FALSE;
Skip = TRUE;
Status = RestoreLockBox (&gS3StorageDeviceInitListGuid, &DummyData, &S3InitDevicesLength);
if (Status != EFI_BUFFER_TOO_SMALL) {
return Skip;
} else {
S3InitDevices = AllocatePool (S3InitDevicesLength);
if (S3InitDevices == NULL) {
return Skip;
}
Status = RestoreLockBox (&gS3StorageDeviceInitListGuid, S3InitDevices, &S3InitDevicesLength);
if (EFI_ERROR (Status)) {
return Skip;
}
}
if (S3InitDevices == NULL) {
return Skip;
}
//
// Only need to initialize the controllers that exist in the device list.
//
do {
//
// Fetch the size of current device path instance.
//
Status = GetDevicePathInstanceSize (
S3InitDevices,
&DevicePathInstLength,
&EntireEnd
);
if (EFI_ERROR (Status)) {
break;
}
DevicePathInst = S3InitDevices;
S3InitDevices = (EFI_DEVICE_PATH_PROTOCOL *)((UINTN)S3InitDevices + DevicePathInstLength);
if (HcDevicePathLength >= DevicePathInstLength) {
continue;
}
//
// Compare the device paths to determine if the device is managed by this
// controller.
//
if (CompareMem (
DevicePathInst,
HcDevicePath,
HcDevicePathLength - sizeof (EFI_DEVICE_PATH_PROTOCOL)
) == 0)
{
Skip = FALSE;
break;
}
} while (!EntireEnd);
return Skip;
}
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