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
arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)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 	int entry_type;
21 
22 	entry_type = e820__get_entry_type(start, end);
23 	if (entry_type == E820_TYPE_RESERVED || entry_type == E820_TYPE_NVS)
24 		return 0;
25 
26 	pr_err(FW_BUG "No firmware reserved region can cover this RMRR [%#018Lx-%#018Lx], contact BIOS vendor for fixes\n",
27 	       start, end - 1);
28 	return -EINVAL;
29 }
30 
31 #endif /* _ASM_X86_IOMMU_H */
32