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
  33 #define IOMMU_PAGE_SHIFT      12
  34 #define IOMMU_PAGE_SIZE       (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
  35 #define IOMMU_PAGE_MASK       (~((1 << IOMMU_PAGE_SHIFT) - 1))
  36 #define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
  37
  38 /* Boot time flags */
  39 extern int iommu_is_off;
  40 extern int iommu_force_on;
  41
  42 /* Pure 2^n version of get_order */
  43 static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
  44 {
  45         return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
  46 }
  47
  48
  49 /*
  50  * IOMAP_MAX_ORDER defines the largest contiguous block
  51  * of dma space we can get.  IOMAP_MAX_ORDER = 13
  52  * allows up to 2**12 pages (4096 * 4096) = 16 MB
  53  */
  54 #define IOMAP_MAX_ORDER         13
  55
  56 #define IOMMU_POOL_HASHBITS     2
  57 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
  58
  59 struct iommu_pool {
  60         unsigned long start;
  61         unsigned long end;
  62         unsigned long hint;
  63         spinlock_t lock;
  64 } ____cacheline_aligned_in_smp;
  65
  66 struct iommu_table {
  67         unsigned long  it_busno;     /* Bus number this table belongs to */
  68         unsigned long  it_size;      /* Size of iommu table in entries */
  69         unsigned long  it_offset;    /* Offset into global table */
  70         unsigned long  it_base;      /* mapped address of tce table */
  71         unsigned long  it_index;     /* which iommu table this is */
  72         unsigned long  it_type;      /* type: PCI or Virtual Bus */
  73         unsigned long  it_blocksize; /* Entries in each block (cacheline) */
  74         unsigned long  poolsize;
  75         unsigned long  nr_pools;
  76         struct iommu_pool large_pool;
  77         struct iommu_pool pools[IOMMU_NR_POOLS];
  78         unsigned long *it_map;       /* A simple allocation bitmap for now */
  79 #ifdef CONFIG_IOMMU_API
  80         struct iommu_group *it_group;
  81 #endif
  82 };
  83
  84 struct scatterlist;
  85
  86 static inline void set_iommu_table_base(struct device *dev, void *base)
  87 {
  88         dev->archdata.dma_data.iommu_table_base = base;
  89 }
  90
  91 static inline void *get_iommu_table_base(struct device *dev)
  92 {
  93         return dev->archdata.dma_data.iommu_table_base;
  94 }
  95
  96 /* Frees table for an individual device node */
  97 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
  98
  99 /* Initializes an iommu_table based in values set in the passed-in
 100  * structure
 101  */
 102 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
 103                                             int nid);
 104 extern void iommu_register_group(struct iommu_table *tbl,
 105                                  int pci_domain_number, unsigned long pe_num);
 106
 107 extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 108                         struct scatterlist *sglist, int nelems,
 109                         unsigned long mask, enum dma_data_direction direction,
 110                         struct dma_attrs *attrs);
 111 extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
 112                            int nelems, enum dma_data_direction direction,
 113                            struct dma_attrs *attrs);
 114
 115 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
 116                                   size_t size, dma_addr_t *dma_handle,
 117                                   unsigned long mask, gfp_t flag, int node);
 118 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
 119                                 void *vaddr, dma_addr_t dma_handle);
 120 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
 121                                  struct page *page, unsigned long offset,
 122                                  size_t size, unsigned long mask,
 123                                  enum dma_data_direction direction,
 124                                  struct dma_attrs *attrs);
 125 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
 126                              size_t size, enum dma_data_direction direction,
 127                              struct dma_attrs *attrs);
 128
 129 extern void iommu_init_early_pSeries(void);
 130 extern void iommu_init_early_dart(void);
 131 extern void iommu_init_early_pasemi(void);
 132
 133 extern void alloc_dart_table(void);
 134 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
 135 static inline void iommu_save(void)
 136 {
 137         if (ppc_md.iommu_save)
 138                 ppc_md.iommu_save();
 139 }
 140
 141 static inline void iommu_restore(void)
 142 {
 143         if (ppc_md.iommu_restore)
 144                 ppc_md.iommu_restore();
 145 }
 146 #endif
 147
 148 /* The API to support IOMMU operations for VFIO */
 149 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
 150                 unsigned long ioba, unsigned long tce_value,
 151                 unsigned long npages);
 152 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
 153                 unsigned long ioba, unsigned long tce);
 154 extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
 155                 unsigned long hwaddr, enum dma_data_direction direction);
 156 extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
 157                 unsigned long entry);
 158 extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl,
 159                 unsigned long entry, unsigned long pages);
 160 extern int iommu_put_tce_user_mode(struct iommu_table *tbl,
 161                 unsigned long entry, unsigned long tce);
 162
 163 extern void iommu_flush_tce(struct iommu_table *tbl);
 164 extern int iommu_take_ownership(struct iommu_table *tbl);
 165 extern void iommu_release_ownership(struct iommu_table *tbl);
 166
 167 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
 168
 169 #endif /* __KERNEL__ */
 170 #endif /* _ASM_IOMMU_H */