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OvmfPkg/MptScsiDxe: Build and decode DevicePath 

Used to identify the individual disks in the hardware tree.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2390
Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200504210607.144434-8-nikita.leshchenko@oracle.com>
This commit is contained in:
Nikita Leshenko 2020-05-05 00:06:02 +03:00 committed by mergify[bot]
parent 093cceaf79
commit f9941d31dd
1 changed files with 59 additions and 2 deletions
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61
OvmfPkg/MptScsiDxe/MptScsi.c
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@ -147,7 +147,36 @@ MptScsiBuildDevicePath (
IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath
)
{
return EFI_UNSUPPORTED;
MPT_SCSI_DEV *Dev;
SCSI_DEVICE_PATH *ScsiDevicePath;
if (DevicePath == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// This device support 256 targets only, so it's enough to dereference
// the LSB of Target.
//
Dev = MPT_SCSI_FROM_PASS_THRU (This);
if (*Target > Dev->MaxTarget || Lun > 0) {
return EFI_NOT_FOUND;
}
ScsiDevicePath = AllocateZeroPool (sizeof (*ScsiDevicePath));
if (ScsiDevicePath == NULL) {
return EFI_OUT_OF_RESOURCES;
}
ScsiDevicePath->Header.Type = MESSAGING_DEVICE_PATH;
ScsiDevicePath->Header.SubType = MSG_SCSI_DP;
ScsiDevicePath->Header.Length[0] = (UINT8)sizeof (*ScsiDevicePath);
ScsiDevicePath->Header.Length[1] = (UINT8)(sizeof (*ScsiDevicePath) >> 8);
ScsiDevicePath->Pun = *Target;
ScsiDevicePath->Lun = (UINT16)Lun;
*DevicePath = &ScsiDevicePath->Header;
return EFI_SUCCESS;
}
STATIC
@ -160,7 +189,35 @@ MptScsiGetTargetLun (
OUT UINT64 *Lun
)
{
return EFI_UNSUPPORTED;
MPT_SCSI_DEV *Dev;
SCSI_DEVICE_PATH *ScsiDevicePath;
if (DevicePath == NULL ||
Target == NULL || *Target == NULL || Lun == NULL) {
return EFI_INVALID_PARAMETER;
}
if (DevicePath->Type != MESSAGING_DEVICE_PATH ||
DevicePath->SubType != MSG_SCSI_DP) {
return EFI_UNSUPPORTED;
}
Dev = MPT_SCSI_FROM_PASS_THRU (This);
ScsiDevicePath = (SCSI_DEVICE_PATH *)DevicePath;
if (ScsiDevicePath->Pun > Dev->MaxTarget ||
ScsiDevicePath->Lun > 0) {
return EFI_NOT_FOUND;
}
ZeroMem (*Target, TARGET_MAX_BYTES);
//
// This device support 256 targets only, so it's enough to set the LSB
// of Target.
//
**Target = (UINT8)ScsiDevicePath->Pun;
*Lun = ScsiDevicePath->Lun;
return EFI_SUCCESS;
}
STATIC