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 extern int iommu_merge; 12 extern int panic_on_overflow; 13 14 #ifdef CONFIG_SWIOTLB 15 extern bool x86_swiotlb_enable; 16 #else 17 #define x86_swiotlb_enable false 18 #endif 19 20 /* 10 seconds */ 21 #define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) 22 23 static inline int __init 24 arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr) 25 { 26 u64 start = rmrr->base_address; 27 u64 end = rmrr->end_address + 1; 28 29 if (e820__mapped_all(start, end, E820_TYPE_RESERVED)) 30 return 0; 31 32 pr_err(FW_BUG "No firmware reserved region can cover this RMRR [%#018Lx-%#018Lx], contact BIOS vendor for fixes\n", 33 start, end - 1); 34 return -EINVAL; 35 } 36 37 #endif /* _ASM_X86_IOMMU_H */ 38