arch/x86/include/asm/iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_IOMMU_H
   3 #define _ASM_X86_IOMMU_H
   4
   5 #include <linux/acpi.h>
   6
   7 #include <asm/e820/api.h>
   8
   9 extern int force_iommu, no_iommu;
  10 extern int iommu_detected;
  11
  12 /* 10 seconds */
  13 #define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
  14
  15 static inline int __init
  16 arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
  17 {
  18         u64 start = rmrr->base_address;
  19         u64 end = rmrr->end_address + 1;
  20
  21         if (e820__mapped_all(start, end, E820_TYPE_RESERVED))
  22                 return 0;
  23
  24         pr_err(FW_BUG "No firmware reserved region can cover this RMRR [%#018Lx-%#018Lx], contact BIOS vendor for fixes\n",
  25                start, end - 1);
  26         return -EINVAL;
  27 }
  28
  29 #endif /* _ASM_X86_IOMMU_H */