1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * pasid.h - PASID idr, table and entry header 4 * 5 * Copyright (C) 2018 Intel Corporation 6 * 7 * Author: Lu Baolu <baolu.lu@linux.intel.com> 8 */ 9 10 #ifndef __INTEL_PASID_H 11 #define __INTEL_PASID_H 12 13 #define PASID_RID2PASID 0x0 14 #define PASID_MIN 0x1 15 #define PASID_MAX 0x100000 16 #define PASID_PTE_MASK 0x3F 17 #define PASID_PTE_PRESENT 1 18 #define PASID_PTE_FPD 2 19 #define PDE_PFN_MASK PAGE_MASK 20 #define PASID_PDE_SHIFT 6 21 #define MAX_NR_PASID_BITS 20 22 #define PASID_TBL_ENTRIES BIT(PASID_PDE_SHIFT) 23 24 #define is_pasid_enabled(entry) (((entry)->lo >> 3) & 0x1) 25 #define get_pasid_dir_size(entry) (1 << ((((entry)->lo >> 9) & 0x7) + 7)) 26 27 /* Virtual command interface for enlightened pasid management. */ 28 #define VCMD_CMD_ALLOC 0x1 29 #define VCMD_CMD_FREE 0x2 30 #define VCMD_VRSP_IP 0x1 31 #define VCMD_VRSP_SC(e) (((e) >> 1) & 0x3) 32 #define VCMD_VRSP_SC_SUCCESS 0 33 #define VCMD_VRSP_SC_NO_PASID_AVAIL 1 34 #define VCMD_VRSP_SC_INVALID_PASID 1 35 #define VCMD_VRSP_RESULT_PASID(e) (((e) >> 8) & 0xfffff) 36 #define VCMD_CMD_OPERAND(e) ((e) << 8) 37 /* 38 * Domain ID reserved for pasid entries programmed for first-level 39 * only and pass-through transfer modes. 40 */ 41 #define FLPT_DEFAULT_DID 1 42 43 /* 44 * The SUPERVISOR_MODE flag indicates a first level translation which 45 * can be used for access to kernel addresses. It is valid only for 46 * access to the kernel's static 1:1 mapping of physical memory — not 47 * to vmalloc or even module mappings. 48 */ 49 #define PASID_FLAG_SUPERVISOR_MODE BIT(0) 50 #define PASID_FLAG_NESTED BIT(1) 51 52 /* 53 * The PASID_FLAG_FL5LP flag Indicates using 5-level paging for first- 54 * level translation, otherwise, 4-level paging will be used. 55 */ 56 #define PASID_FLAG_FL5LP BIT(1) 57 58 struct pasid_dir_entry { 59 u64 val; 60 }; 61 62 struct pasid_entry { 63 u64 val[8]; 64 }; 65 66 #define PASID_ENTRY_PGTT_FL_ONLY (1) 67 #define PASID_ENTRY_PGTT_SL_ONLY (2) 68 #define PASID_ENTRY_PGTT_NESTED (3) 69 #define PASID_ENTRY_PGTT_PT (4) 70 71 /* The representative of a PASID table */ 72 struct pasid_table { 73 void *table; /* pasid table pointer */ 74 int order; /* page order of pasid table */ 75 int max_pasid; /* max pasid */ 76 struct list_head dev; /* device list */ 77 }; 78 79 /* Get PRESENT bit of a PASID directory entry. */ 80 static inline bool pasid_pde_is_present(struct pasid_dir_entry *pde) 81 { 82 return READ_ONCE(pde->val) & PASID_PTE_PRESENT; 83 } 84 85 /* Get PASID table from a PASID directory entry. */ 86 static inline struct pasid_entry * 87 get_pasid_table_from_pde(struct pasid_dir_entry *pde) 88 { 89 if (!pasid_pde_is_present(pde)) 90 return NULL; 91 92 return phys_to_virt(READ_ONCE(pde->val) & PDE_PFN_MASK); 93 } 94 95 /* Get PRESENT bit of a PASID table entry. */ 96 static inline bool pasid_pte_is_present(struct pasid_entry *pte) 97 { 98 return READ_ONCE(pte->val[0]) & PASID_PTE_PRESENT; 99 } 100 101 extern u32 intel_pasid_max_id; 102 int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp); 103 void intel_pasid_free_id(int pasid); 104 void *intel_pasid_lookup_id(int pasid); 105 int intel_pasid_alloc_table(struct device *dev); 106 void intel_pasid_free_table(struct device *dev); 107 struct pasid_table *intel_pasid_get_table(struct device *dev); 108 int intel_pasid_get_dev_max_id(struct device *dev); 109 struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid); 110 int intel_pasid_setup_first_level(struct intel_iommu *iommu, 111 struct device *dev, pgd_t *pgd, 112 int pasid, u16 did, int flags); 113 int intel_pasid_setup_second_level(struct intel_iommu *iommu, 114 struct dmar_domain *domain, 115 struct device *dev, int pasid); 116 int intel_pasid_setup_pass_through(struct intel_iommu *iommu, 117 struct dmar_domain *domain, 118 struct device *dev, int pasid); 119 int intel_pasid_setup_nested(struct intel_iommu *iommu, 120 struct device *dev, pgd_t *pgd, int pasid, 121 struct iommu_gpasid_bind_data_vtd *pasid_data, 122 struct dmar_domain *domain, int addr_width); 123 void intel_pasid_tear_down_entry(struct intel_iommu *iommu, 124 struct device *dev, int pasid, 125 bool fault_ignore); 126 int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid); 127 void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid); 128 #endif /* __INTEL_PASID_H */ 129