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 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 */ 41 struct 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 */ 64 struct 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 */ 160 struct 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 }; 170 171 /** 172 * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU. 173 * 174 * @fmt: The page table format. 175 * @cfg: The page table configuration. This will be modified to represent 176 * the configuration actually provided by the allocator (e.g. the 177 * pgsize_bitmap may be restricted). 178 * @cookie: An opaque token provided by the IOMMU driver and passed back to 179 * the callback routines in cfg->tlb. 180 */ 181 struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, 182 struct io_pgtable_cfg *cfg, 183 void *cookie); 184 185 /** 186 * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller 187 * *must* ensure that the page table is no longer 188 * live, but the TLB can be dirty. 189 * 190 * @ops: The ops returned from alloc_io_pgtable_ops. 191 */ 192 void free_io_pgtable_ops(struct io_pgtable_ops *ops); 193 194 195 /* 196 * Internal structures for page table allocator implementations. 197 */ 198 199 /** 200 * struct io_pgtable - Internal structure describing a set of page tables. 201 * 202 * @fmt: The page table format. 203 * @cookie: An opaque token provided by the IOMMU driver and passed back to 204 * any callback routines. 205 * @cfg: A copy of the page table configuration. 206 * @ops: The page table operations in use for this set of page tables. 207 */ 208 struct io_pgtable { 209 enum io_pgtable_fmt fmt; 210 void *cookie; 211 struct io_pgtable_cfg cfg; 212 struct io_pgtable_ops ops; 213 }; 214 215 #define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops) 216 217 static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop) 218 { 219 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all) 220 iop->cfg.tlb->tlb_flush_all(iop->cookie); 221 } 222 223 static inline void 224 io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova, 225 size_t size, size_t granule) 226 { 227 if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk) 228 iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie); 229 } 230 231 static inline void 232 io_pgtable_tlb_add_page(struct io_pgtable *iop, 233 struct iommu_iotlb_gather * gather, unsigned long iova, 234 size_t granule) 235 { 236 if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page) 237 iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie); 238 } 239 240 /** 241 * struct io_pgtable_init_fns - Alloc/free a set of page tables for a 242 * particular format. 243 * 244 * @alloc: Allocate a set of page tables described by cfg. 245 * @free: Free the page tables associated with iop. 246 */ 247 struct io_pgtable_init_fns { 248 struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie); 249 void (*free)(struct io_pgtable *iop); 250 }; 251 252 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns; 253 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns; 254 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns; 255 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns; 256 extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns; 257 extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns; 258 extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns; 259 extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v2_init_fns; 260 extern struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns; 261 262 #endif /* __IO_PGTABLE_H */ 263