1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __IO_PGTABLE_H
3#define __IO_PGTABLE_H
4
5#include <linux/bitops.h>
6#include <linux/iommu.h>
7
8/*
9 * Public API for use by IOMMU drivers
10 */
11enum io_pgtable_fmt {
12 ARM_32_LPAE_S1,
13 ARM_32_LPAE_S2,
14 ARM_64_LPAE_S1,
15 ARM_64_LPAE_S2,
16 ARM_V7S,
17 ARM_MALI_LPAE,
18 AMD_IOMMU_V1,
19 AMD_IOMMU_V2,
20 APPLE_DART,
21 APPLE_DART2,
22 IO_PGTABLE_NUM_FMTS,
23};
24
25/**
26 * struct iommu_flush_ops - IOMMU callbacks for TLB and page table management.
27 *
28 * @tlb_flush_all: Synchronously invalidate the entire TLB context.
29 * @tlb_flush_walk: Synchronously invalidate all intermediate TLB state
30 * (sometimes referred to as the "walk cache") for a virtual
31 * address range.
32 * @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a
33 * single page. IOMMUs that cannot batch TLB invalidation
34 * operations efficiently will typically issue them here, but
35 * others may decide to update the iommu_iotlb_gather structure
36 * and defer the invalidation until iommu_iotlb_sync() instead.
37 *
38 * Note that these can all be called in atomic context and must therefore
39 * not block.
40 */
41struct iommu_flush_ops {
42 void (*tlb_flush_all)(void *cookie);
43 void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule,
44 void *cookie);
45 void (*tlb_add_page)(struct iommu_iotlb_gather *gather,
46 unsigned long iova, size_t granule, void *cookie);
47};
48
49/**
50 * struct io_pgtable_cfg - Configuration data for a set of page tables.
51 *
52 * @quirks: A bitmap of hardware quirks that require some special
53 * action by the low-level page table allocator.
54 * @pgsize_bitmap: A bitmap of page sizes supported by this set of page
55 * tables.
56 * @ias: Input address (iova) size, in bits.
57 * @oas: Output address (paddr) size, in bits.
58 * @coherent_walk A flag to indicate whether or not page table walks made
59 * by the IOMMU are coherent with the CPU caches.
60 * @tlb: TLB management callbacks for this set of tables.
61 * @iommu_dev: The device representing the DMA configuration for the
62 * page table walker.
63 */
64struct io_pgtable_cfg {
65 /*
66 * IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in
67 * stage 1 PTEs, for hardware which insists on validating them
68 * even in non-secure state where they should normally be ignored.
69 *
70 * IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and
71 * IOMMU_NOEXEC flags and map everything with full access, for
72 * hardware which does not implement the permissions of a given
73 * format, and/or requires some format-specific default value.
74 *
75 * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
76 * to support up to 35 bits PA where the bit32, bit33 and bit34 are
77 * encoded in the bit9, bit4 and bit5 of the PTE respectively.
78 *
79 * IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT: (ARM v7s format) MediaTek IOMMUs
80 * extend the translation table base support up to 35 bits PA, the
81 * encoding format is same with IO_PGTABLE_QUIRK_ARM_MTK_EXT.
82 *
83 * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
84 * for use in the upper half of a split address space.
85 *
86 * IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability
87 * attributes set in the TCR for a non-coherent page-table walker.
88 */
89 #define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
90 #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
91 #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
92 #define IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT BIT(4)
93 #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
94 #define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6)
95 unsigned long quirks;
96 unsigned long pgsize_bitmap;
97 unsigned int ias;
98 unsigned int oas;
99 bool coherent_walk;
100 const struct iommu_flush_ops *tlb;
101 struct device *iommu_dev;
102
103 /* Low-level data specific to the table format */
104 union {
105 struct {
106 u64 ttbr;
107 struct {
108 u32 ips:3;
109 u32 tg:2;
110 u32 sh:2;
111 u32 orgn:2;
112 u32 irgn:2;
113 u32 tsz:6;
114 } tcr;
115 u64 mair;
116 } arm_lpae_s1_cfg;
117
118 struct {
119 u64 vttbr;
120 struct {
121 u32 ps:3;
122 u32 tg:2;
123 u32 sh:2;
124 u32 orgn:2;
125 u32 irgn:2;
126 u32 sl:2;
127 u32 tsz:6;
128 } vtcr;
129 } arm_lpae_s2_cfg;
130
131 struct {
132 u32 ttbr;
133 u32 tcr;
134 u32 nmrr;
135 u32 prrr;
136 } arm_v7s_cfg;
137
138 struct {
139 u64 transtab;
140 u64 memattr;
141 } arm_mali_lpae_cfg;
142
143 struct {
144 u64 ttbr[4];
145 u32 n_ttbrs;
146 } apple_dart_cfg;
147 };
148};
149
150/**
151 * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
152 *
153 * @map_pages: Map a physically contiguous range of pages of the same size.
154 * @unmap_pages: Unmap a range of virtually contiguous pages of the same size.
155 * @iova_to_phys: Translate iova to physical address.
156 *
157 * These functions map directly onto the iommu_ops member functions with
158 * the same names.
159 */
160struct io_pgtable_ops {
161 int (*map_pages)(struct io_pgtable_ops *ops, unsigned long iova,
162 phys_addr_t paddr, size_t pgsize, size_t pgcount,
163 int prot, gfp_t gfp, size_t *mapped);
164 size_t (*unmap_pages)(struct io_pgtable_ops *ops, unsigned long iova,
165 size_t pgsize, size_t pgcount,
166 struct iommu_iotlb_gather *gather);
167 phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
168 unsigned long iova);
169 int (*read_and_clear_dirty)(struct io_pgtable_ops *ops,
170 unsigned long iova, size_t size,
171 unsigned long flags,
172 struct iommu_dirty_bitmap *dirty);
173};
174
175/**
176 * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
177 *
178 * @fmt: The page table format.
179 * @cfg: The page table configuration. This will be modified to represent
180 * the configuration actually provided by the allocator (e.g. the
181 * pgsize_bitmap may be restricted).
182 * @cookie: An opaque token provided by the IOMMU driver and passed back to
183 * the callback routines in cfg->tlb.
184 */
185struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
186 struct io_pgtable_cfg *cfg,
187 void *cookie);
188
189/**
190 * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
191 * *must* ensure that the page table is no longer
192 * live, but the TLB can be dirty.
193 *
194 * @ops: The ops returned from alloc_io_pgtable_ops.
195 */
196void free_io_pgtable_ops(struct io_pgtable_ops *ops);
197
198
199/*
200 * Internal structures for page table allocator implementations.
201 */
202
203/**
204 * struct io_pgtable - Internal structure describing a set of page tables.
205 *
206 * @fmt: The page table format.
207 * @cookie: An opaque token provided by the IOMMU driver and passed back to
208 * any callback routines.
209 * @cfg: A copy of the page table configuration.
210 * @ops: The page table operations in use for this set of page tables.
211 */
212struct io_pgtable {
213 enum io_pgtable_fmt fmt;
214 void *cookie;
215 struct io_pgtable_cfg cfg;
216 struct io_pgtable_ops ops;
217};
218
219#define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
220
221static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
222{
223 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all)
224 iop->cfg.tlb->tlb_flush_all(iop->cookie);
225}
226
227static inline void
228io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova,
229 size_t size, size_t granule)
230{
231 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk)
232 iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie);
233}
234
235static inline void
236io_pgtable_tlb_add_page(struct io_pgtable *iop,
237 struct iommu_iotlb_gather * gather, unsigned long iova,
238 size_t granule)
239{
240 if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page)
241 iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie);
242}
243
244/**
245 * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
246 * particular format.
247 *
248 * @alloc: Allocate a set of page tables described by cfg.
249 * @free: Free the page tables associated with iop.
250 */
251struct io_pgtable_init_fns {
252 struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
253 void (*free)(struct io_pgtable *iop);
254};
255
256extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
257extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
258extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
259extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
260extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
261extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
262extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns;
263extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v2_init_fns;
264extern struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns;
265
266#endif /* __IO_PGTABLE_H */
267

source code of linux/include/linux/io-pgtable.h