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 APPLE_DART, 20 IO_PGTABLE_NUM_FMTS, 21 }; 22 23 /** 24 * struct iommu_flush_ops - IOMMU callbacks for TLB and page table management. 25 * 26 * @tlb_flush_all: Synchronously invalidate the entire TLB context. 27 * @tlb_flush_walk: Synchronously invalidate all intermediate TLB state 28 * (sometimes referred to as the "walk cache") for a virtual 29 * address range. 30 * @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a 31 * single page. IOMMUs that cannot batch TLB invalidation 32 * operations efficiently will typically issue them here, but 33 * others may decide to update the iommu_iotlb_gather structure 34 * and defer the invalidation until iommu_iotlb_sync() instead. 35 * 36 * Note that these can all be called in atomic context and must therefore 37 * not block. 38 */ 39 struct iommu_flush_ops { 40 void (*tlb_flush_all)(void *cookie); 41 void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule, 42 void *cookie); 43 void (*tlb_add_page)(struct iommu_iotlb_gather *gather, 44 unsigned long iova, size_t granule, void *cookie); 45 }; 46 47 /** 48 * struct io_pgtable_cfg - Configuration data for a set of page tables. 49 * 50 * @quirks: A bitmap of hardware quirks that require some special 51 * action by the low-level page table allocator. 52 * @pgsize_bitmap: A bitmap of page sizes supported by this set of page 53 * tables. 54 * @ias: Input address (iova) size, in bits. 55 * @oas: Output address (paddr) size, in bits. 56 * @coherent_walk A flag to indicate whether or not page table walks made 57 * by the IOMMU are coherent with the CPU caches. 58 * @tlb: TLB management callbacks for this set of tables. 59 * @iommu_dev: The device representing the DMA configuration for the 60 * page table walker. 61 */ 62 struct io_pgtable_cfg { 63 /* 64 * IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in 65 * stage 1 PTEs, for hardware which insists on validating them 66 * even in non-secure state where they should normally be ignored. 67 * 68 * IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and 69 * IOMMU_NOEXEC flags and map everything with full access, for 70 * hardware which does not implement the permissions of a given 71 * format, and/or requires some format-specific default value. 72 * 73 * IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend 74 * to support up to 35 bits PA where the bit32, bit33 and bit34 are 75 * encoded in the bit9, bit4 and bit5 of the PTE respectively. 76 * 77 * IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT: (ARM v7s format) MediaTek IOMMUs 78 * extend the translation table base support up to 35 bits PA, the 79 * encoding format is same with IO_PGTABLE_QUIRK_ARM_MTK_EXT. 80 * 81 * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table 82 * for use in the upper half of a split address space. 83 * 84 * IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability 85 * attributes set in the TCR for a non-coherent page-table walker. 86 */ 87 #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) 88 #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) 89 #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3) 90 #define IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT BIT(4) 91 #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5) 92 #define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6) 93 unsigned long quirks; 94 unsigned long pgsize_bitmap; 95 unsigned int ias; 96 unsigned int oas; 97 bool coherent_walk; 98 const struct iommu_flush_ops *tlb; 99 struct device *iommu_dev; 100 101 /* Low-level data specific to the table format */ 102 union { 103 struct { 104 u64 ttbr; 105 struct { 106 u32 ips:3; 107 u32 tg:2; 108 u32 sh:2; 109 u32 orgn:2; 110 u32 irgn:2; 111 u32 tsz:6; 112 } tcr; 113 u64 mair; 114 } arm_lpae_s1_cfg; 115 116 struct { 117 u64 vttbr; 118 struct { 119 u32 ps:3; 120 u32 tg:2; 121 u32 sh:2; 122 u32 orgn:2; 123 u32 irgn:2; 124 u32 sl:2; 125 u32 tsz:6; 126 } vtcr; 127 } arm_lpae_s2_cfg; 128 129 struct { 130 u32 ttbr; 131 u32 tcr; 132 u32 nmrr; 133 u32 prrr; 134 } arm_v7s_cfg; 135 136 struct { 137 u64 transtab; 138 u64 memattr; 139 } arm_mali_lpae_cfg; 140 141 struct { 142 u64 ttbr[4]; 143 u32 n_ttbrs; 144 } apple_dart_cfg; 145 }; 146 }; 147 148 /** 149 * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers. 150 * 151 * @map: Map a physically contiguous memory region. 152 * @map_pages: Map a physically contiguous range of pages of the same size. 153 * @unmap: Unmap a physically contiguous memory region. 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)(struct io_pgtable_ops *ops, unsigned long iova, 162 phys_addr_t paddr, size_t size, int prot, gfp_t gfp); 163 int (*map_pages)(struct io_pgtable_ops *ops, unsigned long iova, 164 phys_addr_t paddr, size_t pgsize, size_t pgcount, 165 int prot, gfp_t gfp, size_t *mapped); 166 size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova, 167 size_t size, struct iommu_iotlb_gather *gather); 168 size_t (*unmap_pages)(struct io_pgtable_ops *ops, unsigned long iova, 169 size_t pgsize, size_t pgcount, 170 struct iommu_iotlb_gather *gather); 171 phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops, 172 unsigned long iova); 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 */ 185 struct 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 */ 196 void 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 */ 212 struct 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) 220 221 static 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 } 226 227 static inline void 228 io_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 } 234 235 static inline void 236 io_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 */ 251 struct io_pgtable_init_fns { 252 struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie); 253 void (*free)(struct io_pgtable *iop); 254 }; 255 256 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns; 257 extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns; 258 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns; 259 extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns; 260 extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns; 261 extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns; 262 extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns; 263 extern struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns; 264 265 #endif /* __IO_PGTABLE_H */ 266