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