1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation 4 * Rewrite, cleanup: 5 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation 6 */ 7 8 #ifndef _ASM_IOMMU_H 9 #define _ASM_IOMMU_H 10 #ifdef __KERNEL__ 11 12 #include <linux/compiler.h> 13 #include <linux/spinlock.h> 14 #include <linux/device.h> 15 #include <linux/dma-map-ops.h> 16 #include <linux/bitops.h> 17 #include <asm/machdep.h> 18 #include <asm/types.h> 19 #include <asm/pci-bridge.h> 20 #include <asm/asm-const.h> 21 22 #define IOMMU_PAGE_SHIFT_4K 12 23 #define IOMMU_PAGE_SIZE_4K (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K) 24 #define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1)) 25 #define IOMMU_PAGE_ALIGN_4K(addr) ALIGN(addr, IOMMU_PAGE_SIZE_4K) 26 27 #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift) 28 #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1)) 29 #define IOMMU_PAGE_ALIGN(addr, tblptr) ALIGN(addr, IOMMU_PAGE_SIZE(tblptr)) 30 31 /* Boot time flags */ 32 extern int iommu_is_off; 33 extern int iommu_force_on; 34 35 struct iommu_table_ops { 36 /* 37 * When called with direction==DMA_NONE, it is equal to clear(). 38 * uaddr is a linear map address. 39 */ 40 int (*set)(struct iommu_table *tbl, 41 long index, long npages, 42 unsigned long uaddr, 43 enum dma_data_direction direction, 44 unsigned long attrs); 45 #ifdef CONFIG_IOMMU_API 46 /* 47 * Exchanges existing TCE with new TCE plus direction bits; 48 * returns old TCE and DMA direction mask. 49 * @tce is a physical address. 50 */ 51 int (*xchg_no_kill)(struct iommu_table *tbl, 52 long index, 53 unsigned long *hpa, 54 enum dma_data_direction *direction); 55 56 void (*tce_kill)(struct iommu_table *tbl, 57 unsigned long index, 58 unsigned long pages); 59 60 __be64 *(*useraddrptr)(struct iommu_table *tbl, long index, bool alloc); 61 #endif 62 void (*clear)(struct iommu_table *tbl, 63 long index, long npages); 64 /* get() returns a physical address */ 65 unsigned long (*get)(struct iommu_table *tbl, long index); 66 void (*flush)(struct iommu_table *tbl); 67 void (*free)(struct iommu_table *tbl); 68 }; 69 70 /* These are used by VIO */ 71 extern struct iommu_table_ops iommu_table_lpar_multi_ops; 72 extern struct iommu_table_ops iommu_table_pseries_ops; 73 74 /* 75 * IOMAP_MAX_ORDER defines the largest contiguous block 76 * of dma space we can get. IOMAP_MAX_ORDER = 13 77 * allows up to 2**12 pages (4096 * 4096) = 16 MB 78 */ 79 #define IOMAP_MAX_ORDER 13 80 81 #define IOMMU_POOL_HASHBITS 2 82 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS) 83 84 struct iommu_pool { 85 unsigned long start; 86 unsigned long end; 87 unsigned long hint; 88 spinlock_t lock; 89 } ____cacheline_aligned_in_smp; 90 91 struct iommu_table { 92 unsigned long it_busno; /* Bus number this table belongs to */ 93 unsigned long it_size; /* Size of iommu table in entries */ 94 unsigned long it_indirect_levels; 95 unsigned long it_level_size; 96 unsigned long it_allocated_size; 97 unsigned long it_offset; /* Offset into global table */ 98 unsigned long it_base; /* mapped address of tce table */ 99 unsigned long it_index; /* which iommu table this is */ 100 unsigned long it_type; /* type: PCI or Virtual Bus */ 101 unsigned long it_blocksize; /* Entries in each block (cacheline) */ 102 unsigned long poolsize; 103 unsigned long nr_pools; 104 struct iommu_pool large_pool; 105 struct iommu_pool pools[IOMMU_NR_POOLS]; 106 unsigned long *it_map; /* A simple allocation bitmap for now */ 107 unsigned long it_page_shift;/* table iommu page size */ 108 struct list_head it_group_list;/* List of iommu_table_group_link */ 109 __be64 *it_userspace; /* userspace view of the table */ 110 struct iommu_table_ops *it_ops; 111 struct kref it_kref; 112 int it_nid; 113 unsigned long it_reserved_start; /* Start of not-DMA-able (MMIO) area */ 114 unsigned long it_reserved_end; 115 }; 116 117 #define IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry) \ 118 ((tbl)->it_ops->useraddrptr((tbl), (entry), false)) 119 #define IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry) \ 120 ((tbl)->it_ops->useraddrptr((tbl), (entry), true)) 121 122 /* Pure 2^n version of get_order */ 123 static inline __attribute_const__ 124 int get_iommu_order(unsigned long size, struct iommu_table *tbl) 125 { 126 return __ilog2((size - 1) >> tbl->it_page_shift) + 1; 127 } 128 129 130 struct scatterlist; 131 132 #ifdef CONFIG_PPC64 133 134 static inline void set_iommu_table_base(struct device *dev, 135 struct iommu_table *base) 136 { 137 dev->archdata.iommu_table_base = base; 138 } 139 140 static inline void *get_iommu_table_base(struct device *dev) 141 { 142 return dev->archdata.iommu_table_base; 143 } 144 145 extern int dma_iommu_dma_supported(struct device *dev, u64 mask); 146 147 extern struct iommu_table *iommu_tce_table_get(struct iommu_table *tbl); 148 extern int iommu_tce_table_put(struct iommu_table *tbl); 149 150 /* Initializes an iommu_table based in values set in the passed-in 151 * structure 152 */ 153 extern struct iommu_table *iommu_init_table(struct iommu_table *tbl, 154 int nid, unsigned long res_start, unsigned long res_end); 155 bool iommu_table_in_use(struct iommu_table *tbl); 156 157 #define IOMMU_TABLE_GROUP_MAX_TABLES 2 158 159 struct iommu_table_group; 160 161 struct iommu_table_group_ops { 162 unsigned long (*get_table_size)( 163 __u32 page_shift, 164 __u64 window_size, 165 __u32 levels); 166 long (*create_table)(struct iommu_table_group *table_group, 167 int num, 168 __u32 page_shift, 169 __u64 window_size, 170 __u32 levels, 171 struct iommu_table **ptbl); 172 long (*set_window)(struct iommu_table_group *table_group, 173 int num, 174 struct iommu_table *tblnew); 175 long (*unset_window)(struct iommu_table_group *table_group, 176 int num); 177 /* Switch ownership from platform code to external user (e.g. VFIO) */ 178 long (*take_ownership)(struct iommu_table_group *table_group); 179 /* Switch ownership from external user (e.g. VFIO) back to core */ 180 void (*release_ownership)(struct iommu_table_group *table_group); 181 }; 182 183 struct iommu_table_group_link { 184 struct list_head next; 185 struct rcu_head rcu; 186 struct iommu_table_group *table_group; 187 }; 188 189 struct iommu_table_group { 190 /* IOMMU properties */ 191 __u32 tce32_start; 192 __u32 tce32_size; 193 __u64 pgsizes; /* Bitmap of supported page sizes */ 194 __u32 max_dynamic_windows_supported; 195 __u32 max_levels; 196 197 struct iommu_group *group; 198 struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES]; 199 struct iommu_table_group_ops *ops; 200 }; 201 202 #ifdef CONFIG_IOMMU_API 203 204 extern void iommu_register_group(struct iommu_table_group *table_group, 205 int pci_domain_number, unsigned long pe_num); 206 extern int iommu_add_device(struct iommu_table_group *table_group, 207 struct device *dev); 208 extern long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl, 209 unsigned long entry, unsigned long *hpa, 210 enum dma_data_direction *direction); 211 extern long iommu_tce_xchg_no_kill(struct mm_struct *mm, 212 struct iommu_table *tbl, 213 unsigned long entry, unsigned long *hpa, 214 enum dma_data_direction *direction); 215 extern void iommu_tce_kill(struct iommu_table *tbl, 216 unsigned long entry, unsigned long pages); 217 218 extern struct iommu_table_group_ops spapr_tce_table_group_ops; 219 #else 220 static inline void iommu_register_group(struct iommu_table_group *table_group, 221 int pci_domain_number, 222 unsigned long pe_num) 223 { 224 } 225 226 static inline int iommu_add_device(struct iommu_table_group *table_group, 227 struct device *dev) 228 { 229 return 0; 230 } 231 #endif /* !CONFIG_IOMMU_API */ 232 233 u64 dma_iommu_get_required_mask(struct device *dev); 234 #else 235 236 static inline void *get_iommu_table_base(struct device *dev) 237 { 238 return NULL; 239 } 240 241 static inline int dma_iommu_dma_supported(struct device *dev, u64 mask) 242 { 243 return 0; 244 } 245 246 #endif /* CONFIG_PPC64 */ 247 248 extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl, 249 struct scatterlist *sglist, int nelems, 250 unsigned long mask, 251 enum dma_data_direction direction, 252 unsigned long attrs); 253 extern void ppc_iommu_unmap_sg(struct iommu_table *tbl, 254 struct scatterlist *sglist, 255 int nelems, 256 enum dma_data_direction direction, 257 unsigned long attrs); 258 259 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, 260 size_t size, dma_addr_t *dma_handle, 261 unsigned long mask, gfp_t flag, int node); 262 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, 263 void *vaddr, dma_addr_t dma_handle); 264 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, 265 struct page *page, unsigned long offset, 266 size_t size, unsigned long mask, 267 enum dma_data_direction direction, 268 unsigned long attrs); 269 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle, 270 size_t size, enum dma_data_direction direction, 271 unsigned long attrs); 272 273 void __init iommu_init_early_pSeries(void); 274 extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops); 275 extern void iommu_init_early_pasemi(void); 276 277 #if defined(CONFIG_PPC64) && defined(CONFIG_PM) 278 static inline void iommu_restore(void) 279 { 280 if (ppc_md.iommu_restore) 281 ppc_md.iommu_restore(); 282 } 283 #endif 284 285 /* The API to support IOMMU operations for VFIO */ 286 extern int iommu_tce_check_ioba(unsigned long page_shift, 287 unsigned long offset, unsigned long size, 288 unsigned long ioba, unsigned long npages); 289 extern int iommu_tce_check_gpa(unsigned long page_shift, 290 unsigned long gpa); 291 292 #define iommu_tce_clear_param_check(tbl, ioba, tce_value, npages) \ 293 (iommu_tce_check_ioba((tbl)->it_page_shift, \ 294 (tbl)->it_offset, (tbl)->it_size, \ 295 (ioba), (npages)) || (tce_value)) 296 #define iommu_tce_put_param_check(tbl, ioba, gpa) \ 297 (iommu_tce_check_ioba((tbl)->it_page_shift, \ 298 (tbl)->it_offset, (tbl)->it_size, \ 299 (ioba), 1) || \ 300 iommu_tce_check_gpa((tbl)->it_page_shift, (gpa))) 301 302 extern void iommu_flush_tce(struct iommu_table *tbl); 303 304 extern enum dma_data_direction iommu_tce_direction(unsigned long tce); 305 extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir); 306 307 #ifdef CONFIG_PPC_CELL_NATIVE 308 extern bool iommu_fixed_is_weak; 309 #else 310 #define iommu_fixed_is_weak false 311 #endif 312 313 extern const struct dma_map_ops dma_iommu_ops; 314 315 #endif /* __KERNEL__ */ 316 #endif /* _ASM_IOMMU_H */ 317