[edk2-devel] [PATCH v5 07/12] OvmfPkg/MptScsiDxe: Build and decode DevicePath
Nikita Leshenko
nikita.leshchenko at oracle.com
Fri Apr 24 17:59:22 UTC 2020
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 at oracle.com>
Reviewed-by: Liran Alon <liran.alon at oracle.com>
Reviewed-by: Laszlo Ersek <lersek at redhat.com>
---
OvmfPkg/MptScsiDxe/MptScsi.c | 61 ++++++++++++++++++++++++++++++++++--
1 file changed, 59 insertions(+), 2 deletions(-)
diff --git a/OvmfPkg/MptScsiDxe/MptScsi.c b/OvmfPkg/MptScsiDxe/MptScsi.c
index 5e0544c8d9d2..dc4b854659f9 100644
--- a/OvmfPkg/MptScsiDxe/MptScsi.c
+++ b/OvmfPkg/MptScsiDxe/MptScsi.c
@@ -146,7 +146,36 @@ 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
@@ -159,7 +188,35 @@ 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
--
2.20.1
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