8902 Panic with debug kernel on AMD Ryzen hardware

*** 17,26 ****
--- 17,27 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2017 Gary Mills
   * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  
  #ifndef _AMD_IOMMU_ACPI_H
  #define _AMD_IOMMU_ACPI_H
*** 38,54 ****
  #ifdef _KERNEL
  
  #define IVRS_SIG        "IVRS"
  
  /*
!  * IVINFO settings
   */
  #define AMD_IOMMU_ACPI_IVINFO_RSV1      (31 << 16 | 23)
  #define AMD_IOMMU_ACPI_HT_ATSRSV        (22 << 16 | 22)
  #define AMD_IOMMU_ACPI_VA_SIZE          (21 << 16 | 15)
  #define AMD_IOMMU_ACPI_PA_SIZE          (14 << 16 | 8)
! #define AMD_IOMMU_ACPI_IVINFO_RSV2      (7 << 16 | 0)
  
  /*
   * IVHD Device entry len field
   */
  #define AMD_IOMMU_ACPI_DEVENTRY_LEN     (7 << 16 | 6)
--- 39,58 ----
  #ifdef _KERNEL
  
  #define IVRS_SIG        "IVRS"
  
  /*
!  * IVINFO bit fields
!  * Documented at: http://support.amd.com/TechDocs/48882_IOMMU.pdf
   */
  #define AMD_IOMMU_ACPI_IVINFO_RSV1      (31 << 16 | 23)
  #define AMD_IOMMU_ACPI_HT_ATSRSV        (22 << 16 | 22)
  #define AMD_IOMMU_ACPI_VA_SIZE          (21 << 16 | 15)
  #define AMD_IOMMU_ACPI_PA_SIZE          (14 << 16 | 8)
! #define AMD_IOMMU_ACPI_GVA_SIZE         (7 << 16 | 5)
! #define AMD_IOMMU_ACPI_IVINFO_RSV2      (4 << 16 | 1)
! #define AMD_IOMMU_ACPI_IVINFO_EFRSUP    (0 << 16 | 0)
  
  /*
   * IVHD Device entry len field
   */
  #define AMD_IOMMU_ACPI_DEVENTRY_LEN     (7 << 16 | 6)