arch/powerpc/include/asm/iommu.h

   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                         bool realmode);
  56
  57         void (*tce_kill)(struct iommu_table *tbl,
  58                         unsigned long index,
  59                         unsigned long pages,
  60                         bool realmode);
  61
  62         __be64 *(*useraddrptr)(struct iommu_table *tbl, long index, bool alloc);
  63 #endif
  64         void (*clear)(struct iommu_table *tbl,
  65                         long index, long npages);
  66         /* get() returns a physical address */
  67         unsigned long (*get)(struct iommu_table *tbl, long index);
  68         void (*flush)(struct iommu_table *tbl);
  69         void (*free)(struct iommu_table *tbl);
  70 };
  71
  72 /* These are used by VIO */
  73 extern struct iommu_table_ops iommu_table_lpar_multi_ops;
  74 extern struct iommu_table_ops iommu_table_pseries_ops;
  75
  76 /*
  77  * IOMAP_MAX_ORDER defines the largest contiguous block
  78  * of dma space we can get.  IOMAP_MAX_ORDER = 13
  79  * allows up to 2**12 pages (4096 * 4096) = 16 MB
  80  */
  81 #define IOMAP_MAX_ORDER         13
  82
  83 #define IOMMU_POOL_HASHBITS     2
  84 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
  85
  86 struct iommu_pool {
  87         unsigned long start;
  88         unsigned long end;
  89         unsigned long hint;
  90         spinlock_t lock;
  91 } ____cacheline_aligned_in_smp;
  92
  93 struct iommu_table {
  94         unsigned long  it_busno;     /* Bus number this table belongs to */
  95         unsigned long  it_size;      /* Size of iommu table in entries */
  96         unsigned long  it_indirect_levels;
  97         unsigned long  it_level_size;
  98         unsigned long  it_allocated_size;
  99         unsigned long  it_offset;    /* Offset into global table */
 100         unsigned long  it_base;      /* mapped address of tce table */
 101         unsigned long  it_index;     /* which iommu table this is */
 102         unsigned long  it_type;      /* type: PCI or Virtual Bus */
 103         unsigned long  it_blocksize; /* Entries in each block (cacheline) */
 104         unsigned long  poolsize;
 105         unsigned long  nr_pools;
 106         struct iommu_pool large_pool;
 107         struct iommu_pool pools[IOMMU_NR_POOLS];
 108         unsigned long *it_map;       /* A simple allocation bitmap for now */
 109         unsigned long  it_page_shift;/* table iommu page size */
 110         struct list_head it_group_list;/* List of iommu_table_group_link */
 111         __be64 *it_userspace; /* userspace view of the table */
 112         struct iommu_table_ops *it_ops;
 113         struct kref    it_kref;
 114         int it_nid;
 115         unsigned long it_reserved_start; /* Start of not-DMA-able (MMIO) area */
 116         unsigned long it_reserved_end;
 117 };
 118
 119 #define IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry) \
 120                 ((tbl)->it_ops->useraddrptr((tbl), (entry), false))
 121 #define IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry) \
 122                 ((tbl)->it_ops->useraddrptr((tbl), (entry), true))
 123
 124 /* Pure 2^n version of get_order */
 125 static inline __attribute_const__
 126 int get_iommu_order(unsigned long size, struct iommu_table *tbl)
 127 {
 128         return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
 129 }
 130
 131
 132 struct scatterlist;
 133
 134 #ifdef CONFIG_PPC64
 135
 136 static inline void set_iommu_table_base(struct device *dev,
 137                                         struct iommu_table *base)
 138 {
 139         dev->archdata.iommu_table_base = base;
 140 }
 141
 142 static inline void *get_iommu_table_base(struct device *dev)
 143 {
 144         return dev->archdata.iommu_table_base;
 145 }
 146
 147 extern int dma_iommu_dma_supported(struct device *dev, u64 mask);
 148
 149 extern struct iommu_table *iommu_tce_table_get(struct iommu_table *tbl);
 150 extern int iommu_tce_table_put(struct iommu_table *tbl);
 151
 152 /* Initializes an iommu_table based in values set in the passed-in
 153  * structure
 154  */
 155 extern struct iommu_table *iommu_init_table(struct iommu_table *tbl,
 156                 int nid, unsigned long res_start, unsigned long res_end);
 157
 158 #define IOMMU_TABLE_GROUP_MAX_TABLES    2
 159
 160 struct iommu_table_group;
 161
 162 struct iommu_table_group_ops {
 163         unsigned long (*get_table_size)(
 164                         __u32 page_shift,
 165                         __u64 window_size,
 166                         __u32 levels);
 167         long (*create_table)(struct iommu_table_group *table_group,
 168                         int num,
 169                         __u32 page_shift,
 170                         __u64 window_size,
 171                         __u32 levels,
 172                         struct iommu_table **ptbl);
 173         long (*set_window)(struct iommu_table_group *table_group,
 174                         int num,
 175                         struct iommu_table *tblnew);
 176         long (*unset_window)(struct iommu_table_group *table_group,
 177                         int num);
 178         /* Switch ownership from platform code to external user (e.g. VFIO) */
 179         void (*take_ownership)(struct iommu_table_group *table_group);
 180         /* Switch ownership from external user (e.g. VFIO) back to core */
 181         void (*release_ownership)(struct iommu_table_group *table_group);
 182 };
 183
 184 struct iommu_table_group_link {
 185         struct list_head next;
 186         struct rcu_head rcu;
 187         struct iommu_table_group *table_group;
 188 };
 189
 190 struct iommu_table_group {
 191         /* IOMMU properties */
 192         __u32 tce32_start;
 193         __u32 tce32_size;
 194         __u64 pgsizes; /* Bitmap of supported page sizes */
 195         __u32 max_dynamic_windows_supported;
 196         __u32 max_levels;
 197
 198         struct iommu_group *group;
 199         struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
 200         struct iommu_table_group_ops *ops;
 201 };
 202
 203 #ifdef CONFIG_IOMMU_API
 204
 205 extern void iommu_register_group(struct iommu_table_group *table_group,
 206                                  int pci_domain_number, unsigned long pe_num);
 207 extern int iommu_add_device(struct iommu_table_group *table_group,
 208                 struct device *dev);
 209 extern void iommu_del_device(struct device *dev);
 210 extern long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl,
 211                 unsigned long entry, unsigned long *hpa,
 212                 enum dma_data_direction *direction);
 213 extern long iommu_tce_xchg_no_kill(struct mm_struct *mm,
 214                 struct iommu_table *tbl,
 215                 unsigned long entry, unsigned long *hpa,
 216                 enum dma_data_direction *direction);
 217 extern void iommu_tce_kill(struct iommu_table *tbl,
 218                 unsigned long entry, unsigned long pages);
 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
 232 static inline void iommu_del_device(struct device *dev)
 233 {
 234 }
 235 #endif /* !CONFIG_IOMMU_API */
 236
 237 u64 dma_iommu_get_required_mask(struct device *dev);
 238 #else
 239
 240 static inline void *get_iommu_table_base(struct device *dev)
 241 {
 242         return NULL;
 243 }
 244
 245 static inline int dma_iommu_dma_supported(struct device *dev, u64 mask)
 246 {
 247         return 0;
 248 }
 249
 250 #endif /* CONFIG_PPC64 */
 251
 252 extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 253                             struct scatterlist *sglist, int nelems,
 254                             unsigned long mask,
 255                             enum dma_data_direction direction,
 256                             unsigned long attrs);
 257 extern void ppc_iommu_unmap_sg(struct iommu_table *tbl,
 258                                struct scatterlist *sglist,
 259                                int nelems,
 260                                enum dma_data_direction direction,
 261                                unsigned long attrs);
 262
 263 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
 264                                   size_t size, dma_addr_t *dma_handle,
 265                                   unsigned long mask, gfp_t flag, int node);
 266 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
 267                                 void *vaddr, dma_addr_t dma_handle);
 268 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
 269                                  struct page *page, unsigned long offset,
 270                                  size_t size, unsigned long mask,
 271                                  enum dma_data_direction direction,
 272                                  unsigned long attrs);
 273 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
 274                              size_t size, enum dma_data_direction direction,
 275                              unsigned long attrs);
 276
 277 extern void iommu_init_early_pSeries(void);
 278 extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops);
 279 extern void iommu_init_early_pasemi(void);
 280
 281 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
 282 static inline void iommu_save(void)
 283 {
 284         if (ppc_md.iommu_save)
 285                 ppc_md.iommu_save();
 286 }
 287
 288 static inline void iommu_restore(void)
 289 {
 290         if (ppc_md.iommu_restore)
 291                 ppc_md.iommu_restore();
 292 }
 293 #endif
 294
 295 /* The API to support IOMMU operations for VFIO */
 296 extern int iommu_tce_check_ioba(unsigned long page_shift,
 297                 unsigned long offset, unsigned long size,
 298                 unsigned long ioba, unsigned long npages);
 299 extern int iommu_tce_check_gpa(unsigned long page_shift,
 300                 unsigned long gpa);
 301
 302 #define iommu_tce_clear_param_check(tbl, ioba, tce_value, npages) \
 303                 (iommu_tce_check_ioba((tbl)->it_page_shift,       \
 304                                 (tbl)->it_offset, (tbl)->it_size, \
 305                                 (ioba), (npages)) || (tce_value))
 306 #define iommu_tce_put_param_check(tbl, ioba, gpa)                 \
 307                 (iommu_tce_check_ioba((tbl)->it_page_shift,       \
 308                                 (tbl)->it_offset, (tbl)->it_size, \
 309                                 (ioba), 1) ||                     \
 310                 iommu_tce_check_gpa((tbl)->it_page_shift, (gpa)))
 311
 312 extern void iommu_flush_tce(struct iommu_table *tbl);
 313 extern int iommu_take_ownership(struct iommu_table *tbl);
 314 extern void iommu_release_ownership(struct iommu_table *tbl);
 315
 316 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
 317 extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir);
 318
 319 #ifdef CONFIG_PPC_CELL_NATIVE
 320 extern bool iommu_fixed_is_weak;
 321 #else
 322 #define iommu_fixed_is_weak false
 323 #endif
 324
 325 extern const struct dma_map_ops dma_iommu_ops;
 326
 327 #endif /* __KERNEL__ */
 328 #endif /* _ASM_IOMMU_H */