arch/powerpc/include/asm/iommu.h

   1 /*
   2  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
   3  * Rewrite, cleanup:
   4  * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #ifndef _ASM_IOMMU_H
  22 #define _ASM_IOMMU_H
  23 #ifdef __KERNEL__
  24
  25 #include <linux/compiler.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/device.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/bitops.h>
  30 #include <asm/machdep.h>
  31 #include <asm/types.h>
  32 #include <asm/pci-bridge.h>
  33
  34 #define IOMMU_PAGE_SHIFT_4K      12
  35 #define IOMMU_PAGE_SIZE_4K       (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K)
  36 #define IOMMU_PAGE_MASK_4K       (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
  37 #define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
  38
  39 #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift)
  40 #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1))
  41 #define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
  42
  43 /* Boot time flags */
  44 extern int iommu_is_off;
  45 extern int iommu_force_on;
  46
  47 /*
  48  * IOMAP_MAX_ORDER defines the largest contiguous block
  49  * of dma space we can get.  IOMAP_MAX_ORDER = 13
  50  * allows up to 2**12 pages (4096 * 4096) = 16 MB
  51  */
  52 #define IOMAP_MAX_ORDER         13
  53
  54 #define IOMMU_POOL_HASHBITS     2
  55 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
  56
  57 struct iommu_pool {
  58         unsigned long start;
  59         unsigned long end;
  60         unsigned long hint;
  61         spinlock_t lock;
  62 } ____cacheline_aligned_in_smp;
  63
  64 struct iommu_table {
  65         unsigned long  it_busno;     /* Bus number this table belongs to */
  66         unsigned long  it_size;      /* Size of iommu table in entries */
  67         unsigned long  it_offset;    /* Offset into global table */
  68         unsigned long  it_base;      /* mapped address of tce table */
  69         unsigned long  it_index;     /* which iommu table this is */
  70         unsigned long  it_type;      /* type: PCI or Virtual Bus */
  71         unsigned long  it_blocksize; /* Entries in each block (cacheline) */
  72         unsigned long  poolsize;
  73         unsigned long  nr_pools;
  74         struct iommu_pool large_pool;
  75         struct iommu_pool pools[IOMMU_NR_POOLS];
  76         unsigned long *it_map;       /* A simple allocation bitmap for now */
  77         unsigned long  it_page_shift;/* table iommu page size */
  78 #ifdef CONFIG_IOMMU_API
  79         struct iommu_group *it_group;
  80 #endif
  81         void (*set_bypass)(struct iommu_table *tbl, bool enable);
  82 };
  83
  84 /* Pure 2^n version of get_order */
  85 static inline __attribute_const__
  86 int get_iommu_order(unsigned long size, struct iommu_table *tbl)
  87 {
  88         return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
  89 }
  90
  91
  92 struct scatterlist;
  93
  94 static inline void set_iommu_table_base(struct device *dev, void *base)
  95 {
  96         dev->archdata.dma_data.iommu_table_base = base;
  97 }
  98
  99 static inline void *get_iommu_table_base(struct device *dev)
 100 {
 101         return dev->archdata.dma_data.iommu_table_base;
 102 }
 103
 104 /* Frees table for an individual device node */
 105 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
 106
 107 /* Initializes an iommu_table based in values set in the passed-in
 108  * structure
 109  */
 110 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
 111                                             int nid);
 112 #ifdef CONFIG_IOMMU_API
 113 extern void iommu_register_group(struct iommu_table *tbl,
 114                                  int pci_domain_number, unsigned long pe_num);
 115 extern int iommu_add_device(struct device *dev);
 116 extern void iommu_del_device(struct device *dev);
 117 extern int __init tce_iommu_bus_notifier_init(void);
 118 #else
 119 static inline void iommu_register_group(struct iommu_table *tbl,
 120                                         int pci_domain_number,
 121                                         unsigned long pe_num)
 122 {
 123 }
 124
 125 static inline int iommu_add_device(struct device *dev)
 126 {
 127         return 0;
 128 }
 129
 130 static inline void iommu_del_device(struct device *dev)
 131 {
 132 }
 133
 134 static inline int __init tce_iommu_bus_notifier_init(void)
 135 {
 136         return 0;
 137 }
 138 #endif /* !CONFIG_IOMMU_API */
 139
 140 static inline void set_iommu_table_base_and_group(struct device *dev,
 141                                                   void *base)
 142 {
 143         set_iommu_table_base(dev, base);
 144         iommu_add_device(dev);
 145 }
 146
 147 extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 148                             struct scatterlist *sglist, int nelems,
 149                             unsigned long mask,
 150                             enum dma_data_direction direction,
 151                             struct dma_attrs *attrs);
 152 extern void ppc_iommu_unmap_sg(struct iommu_table *tbl,
 153                                struct scatterlist *sglist,
 154                                int nelems,
 155                                enum dma_data_direction direction,
 156                                struct dma_attrs *attrs);
 157
 158 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
 159                                   size_t size, dma_addr_t *dma_handle,
 160                                   unsigned long mask, gfp_t flag, int node);
 161 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
 162                                 void *vaddr, dma_addr_t dma_handle);
 163 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
 164                                  struct page *page, unsigned long offset,
 165                                  size_t size, unsigned long mask,
 166                                  enum dma_data_direction direction,
 167                                  struct dma_attrs *attrs);
 168 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
 169                              size_t size, enum dma_data_direction direction,
 170                              struct dma_attrs *attrs);
 171
 172 extern void iommu_init_early_pSeries(void);
 173 extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops);
 174 extern void iommu_init_early_pasemi(void);
 175
 176 extern void alloc_dart_table(void);
 177 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
 178 static inline void iommu_save(void)
 179 {
 180         if (ppc_md.iommu_save)
 181                 ppc_md.iommu_save();
 182 }
 183
 184 static inline void iommu_restore(void)
 185 {
 186         if (ppc_md.iommu_restore)
 187                 ppc_md.iommu_restore();
 188 }
 189 #endif
 190
 191 /* The API to support IOMMU operations for VFIO */
 192 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
 193                 unsigned long ioba, unsigned long tce_value,
 194                 unsigned long npages);
 195 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
 196                 unsigned long ioba, unsigned long tce);
 197 extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
 198                 unsigned long hwaddr, enum dma_data_direction direction);
 199 extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
 200                 unsigned long entry);
 201 extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl,
 202                 unsigned long entry, unsigned long pages);
 203 extern int iommu_put_tce_user_mode(struct iommu_table *tbl,
 204                 unsigned long entry, unsigned long tce);
 205
 206 extern void iommu_flush_tce(struct iommu_table *tbl);
 207 extern int iommu_take_ownership(struct iommu_table *tbl);
 208 extern void iommu_release_ownership(struct iommu_table *tbl);
 209
 210 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
 211
 212 #endif /* __KERNEL__ */
 213 #endif /* _ASM_IOMMU_H */