OvmfPkg/LsiScsiDxe: Probe PCI devices and look for LsiScsi

Implement LsiScsiControllerSupported() to probe the PCI ID and look for
LSI 53C895A.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200717061130.8881-5-glin@suse.com>

OvmfPkg/Include/IndustryStandard/LsiScsi.h

@@ -0,0 +1,20 @@
+/** @file
+
+  Macros and type definitions for LSI 53C895A SCSI devices.
+
+  Copyright (C) 2020, SUSE LLC.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _LSI_SCSI_H_
+#define _LSI_SCSI_H_
+
+//
+// Device ID
+//
+#define LSI_LOGIC_PCI_VENDOR_ID   0x1000
+#define LSI_53C895A_PCI_DEVICE_ID 0x0012
+
+#endif // _LSI_SCSI_H_

OvmfPkg/LsiScsiDxe/LsiScsi.c

@@ -9,7 +9,12 @@
 
 **/
 
+#include <IndustryStandard/LsiScsi.h>
+#include <IndustryStandard/Pci.h>
+#include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiLib.h>
+#include <Protocol/PciIo.h>
+#include <Protocol/PciRootBridgeIo.h>
 #include <Uefi/UefiSpec.h>
 
 #include "LsiScsi.h"
@@ -31,7 +36,48 @@ LsiScsiControllerSupported (
   IN EFI_DEVICE_PATH_PROTOCOL    *RemainingDevicePath OPTIONAL
   )
 {
-  return EFI_UNSUPPORTED;
+  EFI_STATUS          Status;
+  EFI_PCI_IO_PROTOCOL *PciIo;
+  PCI_TYPE00          Pci;
+
+  Status = gBS->OpenProtocol (
+                  ControllerHandle,
+                  &gEfiPciIoProtocolGuid,
+                  (VOID **)&PciIo,
+                  This->DriverBindingHandle,
+                  ControllerHandle,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = PciIo->Pci.Read (
+                        PciIo,
+                        EfiPciIoWidthUint32,
+                        0,
+                        sizeof (Pci) / sizeof (UINT32),
+                        &Pci
+                        );
+  if (EFI_ERROR (Status)) {
+    goto Done;
+  }
+
+  if (Pci.Hdr.VendorId == LSI_LOGIC_PCI_VENDOR_ID &&
+      Pci.Hdr.DeviceId == LSI_53C895A_PCI_DEVICE_ID) {
+    Status = EFI_SUCCESS;
+  } else {
+    Status = EFI_UNSUPPORTED;
+  }
+
+Done:
+  gBS->CloseProtocol (
+         ControllerHandle,
+         &gEfiPciIoProtocolGuid,
+         This->DriverBindingHandle,
+         ControllerHandle
+         );
+  return Status;
 }
 
 EFI_STATUS

OvmfPkg/LsiScsiDxe/LsiScsiDxe.inf

@@ -22,7 +22,13 @@
 
 [Packages]
   MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
 
 [LibraryClasses]
+  BaseLib
+  UefiBootServicesTableLib
   UefiDriverEntryPoint
   UefiLib
+
+[Protocols]
+  gEfiPciIoProtocolGuid                  ## TO_START