1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * intel-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 PDE_PFN_MASK PAGE_MASK
19 #define PASID_PDE_SHIFT 6
20 #define MAX_NR_PASID_BITS 20
21 #define PASID_TBL_ENTRIES BIT(PASID_PDE_SHIFT)
22
23 #define is_pasid_enabled(entry) (((entry)->lo >> 3) & 0x1)
24 #define get_pasid_dir_size(entry) (1 << ((((entry)->lo >> 9) & 0x7) + 7))
25
26 /*
27 * Domain ID reserved for pasid entries programmed for first-level
28 * only and pass-through transfer modes.
29 */
30 #define FLPT_DEFAULT_DID 1
31
32 /*
33 * The SUPERVISOR_MODE flag indicates a first level translation which
34 * can be used for access to kernel addresses. It is valid only for
35 * access to the kernel's static 1:1 mapping of physical memory — not
36 * to vmalloc or even module mappings.
37 */
38 #define PASID_FLAG_SUPERVISOR_MODE BIT(0)
39
40 struct pasid_dir_entry {
41 u64 val;
42 };
43
44 struct pasid_entry {
45 u64 val[8];
46 };
47
48 /* The representative of a PASID table */
49 struct pasid_table {
50 void *table; /* pasid table pointer */
51 int order; /* page order of pasid table */
52 int max_pasid; /* max pasid */
53 struct list_head dev; /* device list */
54 };
55
56 /* Get PRESENT bit of a PASID directory entry. */
pasid_pde_is_present(struct pasid_dir_entry * pde)57 static inline bool pasid_pde_is_present(struct pasid_dir_entry *pde)
58 {
59 return READ_ONCE(pde->val) & PASID_PTE_PRESENT;
60 }
61
62 /* Get PASID table from a PASID directory entry. */
63 static inline struct pasid_entry *
get_pasid_table_from_pde(struct pasid_dir_entry * pde)64 get_pasid_table_from_pde(struct pasid_dir_entry *pde)
65 {
66 if (!pasid_pde_is_present(pde))
67 return NULL;
68
69 return phys_to_virt(READ_ONCE(pde->val) & PDE_PFN_MASK);
70 }
71
72 /* Get PRESENT bit of a PASID table entry. */
pasid_pte_is_present(struct pasid_entry * pte)73 static inline bool pasid_pte_is_present(struct pasid_entry *pte)
74 {
75 return READ_ONCE(pte->val[0]) & PASID_PTE_PRESENT;
76 }
77
78 extern u32 intel_pasid_max_id;
79 int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
80 void intel_pasid_free_id(int pasid);
81 void *intel_pasid_lookup_id(int pasid);
82 int intel_pasid_alloc_table(struct device *dev);
83 void intel_pasid_free_table(struct device *dev);
84 struct pasid_table *intel_pasid_get_table(struct device *dev);
85 int intel_pasid_get_dev_max_id(struct device *dev);
86 struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
87 int intel_pasid_setup_first_level(struct intel_iommu *iommu,
88 struct device *dev, pgd_t *pgd,
89 int pasid, u16 did, int flags);
90 int intel_pasid_setup_second_level(struct intel_iommu *iommu,
91 struct dmar_domain *domain,
92 struct device *dev, int pasid);
93 int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
94 struct dmar_domain *domain,
95 struct device *dev, int pasid);
96 void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
97 struct device *dev, int pasid);
98
99 #endif /* __INTEL_PASID_H */
100