2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
4 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
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.
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.
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
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>
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)
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))
44 extern int iommu_is_off;
45 extern int iommu_force_on;
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
52 #define IOMAP_MAX_ORDER 13
54 #define IOMMU_POOL_HASHBITS 2
55 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
62 } ____cacheline_aligned_in_smp;
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;
81 void (*set_bypass)(struct iommu_table *tbl, bool enable);
82 #ifdef CONFIG_PPC_POWERNV
87 /* Pure 2^n version of get_order */
88 static inline __attribute_const__
89 int get_iommu_order(unsigned long size, struct iommu_table *tbl)
91 return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
97 static inline void set_iommu_table_base(struct device *dev, void *base)
99 dev->archdata.dma_data.iommu_table_base = base;
102 static inline void *get_iommu_table_base(struct device *dev)
104 return dev->archdata.dma_data.iommu_table_base;
107 /* Frees table for an individual device node */
108 extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
110 /* Initializes an iommu_table based in values set in the passed-in
113 extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
115 #ifdef CONFIG_IOMMU_API
116 extern void iommu_register_group(struct iommu_table *tbl,
117 int pci_domain_number, unsigned long pe_num);
118 extern int iommu_add_device(struct device *dev);
119 extern void iommu_del_device(struct device *dev);
120 extern int __init tce_iommu_bus_notifier_init(void);
122 static inline void iommu_register_group(struct iommu_table *tbl,
123 int pci_domain_number,
124 unsigned long pe_num)
128 static inline int iommu_add_device(struct device *dev)
133 static inline void iommu_del_device(struct device *dev)
137 static inline int __init tce_iommu_bus_notifier_init(void)
141 #endif /* !CONFIG_IOMMU_API */
143 static inline void set_iommu_table_base_and_group(struct device *dev,
146 set_iommu_table_base(dev, base);
147 iommu_add_device(dev);
150 extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
151 struct scatterlist *sglist, int nelems,
153 enum dma_data_direction direction,
154 struct dma_attrs *attrs);
155 extern void ppc_iommu_unmap_sg(struct iommu_table *tbl,
156 struct scatterlist *sglist,
158 enum dma_data_direction direction,
159 struct dma_attrs *attrs);
161 extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
162 size_t size, dma_addr_t *dma_handle,
163 unsigned long mask, gfp_t flag, int node);
164 extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
165 void *vaddr, dma_addr_t dma_handle);
166 extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
167 struct page *page, unsigned long offset,
168 size_t size, unsigned long mask,
169 enum dma_data_direction direction,
170 struct dma_attrs *attrs);
171 extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
172 size_t size, enum dma_data_direction direction,
173 struct dma_attrs *attrs);
175 extern void iommu_init_early_pSeries(void);
176 extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops);
177 extern void iommu_init_early_pasemi(void);
179 extern void alloc_dart_table(void);
180 #if defined(CONFIG_PPC64) && defined(CONFIG_PM)
181 static inline void iommu_save(void)
183 if (ppc_md.iommu_save)
187 static inline void iommu_restore(void)
189 if (ppc_md.iommu_restore)
190 ppc_md.iommu_restore();
194 /* The API to support IOMMU operations for VFIO */
195 extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
196 unsigned long ioba, unsigned long tce_value,
197 unsigned long npages);
198 extern int iommu_tce_put_param_check(struct iommu_table *tbl,
199 unsigned long ioba, unsigned long tce);
200 extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
201 unsigned long hwaddr, enum dma_data_direction direction);
202 extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
203 unsigned long entry);
204 extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl,
205 unsigned long entry, unsigned long pages);
206 extern int iommu_put_tce_user_mode(struct iommu_table *tbl,
207 unsigned long entry, unsigned long tce);
209 extern void iommu_flush_tce(struct iommu_table *tbl);
210 extern int iommu_take_ownership(struct iommu_table *tbl);
211 extern void iommu_release_ownership(struct iommu_table *tbl);
213 extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
215 #endif /* __KERNEL__ */
216 #endif /* _ASM_IOMMU_H */