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powerpc/iommu: Add it_page_shift field to determine iommu page size
[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / include / asm / iommu.h
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9b6b563c
PM		 1/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
3 * Rewrite, cleanup:
91f14480 4 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
9b6b563c
PM		 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
88ced031 23#ifdef __KERNEL__
9b6b563c 24
5d2efba6 25#include <linux/compiler.h>
9b6b563c
PM		 26#include <linux/spinlock.h>
27#include <linux/device.h>
28#include <linux/dma-mapping.h>
1977f032 29#include <linux/bitops.h>
7e11580b 30#include <asm/machdep.h>
5d2efba6 31#include <asm/types.h>
5d2efba6 32
e589a440
AP		 33#define IOMMU_PAGE_SHIFT_4K 12
34#define IOMMU_PAGE_SIZE_4K (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K)
35#define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
36#define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
5d2efba6 37
165785e5
JK		 38/* Boot time flags */
39extern int iommu_is_off;
40extern int iommu_force_on;
5d2efba6
LV		 41
42/* Pure 2^n version of get_order */
43static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
44{
e589a440 45 return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT_4K) + 1;
5d2efba6
LV		 46}
47
9b6b563c
PM		 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 */
5d2efba6 54#define IOMAP_MAX_ORDER 13
9b6b563c 55
b4c3a872
AB		 56#define IOMMU_POOL_HASHBITS 2
57#define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
58
59struct iommu_pool {
60 unsigned long start;
61 unsigned long end;
62 unsigned long hint;
63 spinlock_t lock;
64} ____cacheline_aligned_in_smp;
65
9b6b563c
PM		 66struct 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) */
b4c3a872
AB		 74 unsigned long poolsize;
75 unsigned long nr_pools;
76 struct iommu_pool large_pool;
77 struct iommu_pool pools[IOMMU_NR_POOLS];
9b6b563c 78 unsigned long *it_map; /* A simple allocation bitmap for now */
3a553170 79 unsigned long it_page_shift;/* table iommu page size */
4e13c1ac
AK		 80#ifdef CONFIG_IOMMU_API
81 struct iommu_group *it_group;
82#endif
9b6b563c
PM		 83};
84
85struct scatterlist;
9b6b563c 86
738ef42e
BB		 87static inline void set_iommu_table_base(struct device *dev, void *base)
88{
89 dev->archdata.dma_data.iommu_table_base = base;
90}
91
92static inline void *get_iommu_table_base(struct device *dev)
93{
94 return dev->archdata.dma_data.iommu_table_base;
95}
96
9b6b563c 97/* Frees table for an individual device node */
68d315f5 98extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
9b6b563c 99
9b6b563c
PM		 100/* Initializes an iommu_table based in values set in the passed-in
101 * structure
102 */
ca1588e7
AB		 103extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
104 int nid);
d905c5df 105#ifdef CONFIG_IOMMU_API
4e13c1ac
AK		 106extern void iommu_register_group(struct iommu_table *tbl,
107 int pci_domain_number, unsigned long pe_num);
d905c5df
AK		 108extern int iommu_add_device(struct device *dev);
109extern void iommu_del_device(struct device *dev);
110#else
111static inline void iommu_register_group(struct iommu_table *tbl,
112 int pci_domain_number,
113 unsigned long pe_num)
114{
115}
116
117static inline int iommu_add_device(struct device *dev)
118{
119 return 0;
120}
121
122static inline void iommu_del_device(struct device *dev)
123{
124}
125#endif /* !CONFIG_IOMMU_API */
126
127static inline void set_iommu_table_base_and_group(struct device *dev,
128 void *base)
129{
130 set_iommu_table_base(dev, base);
131 iommu_add_device(dev);
132}
9b6b563c 133
c8692362
MN		 134extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
135 struct scatterlist *sglist, int nelems,
3affedc4
MN		 136 unsigned long mask, enum dma_data_direction direction,
137 struct dma_attrs *attrs);
9b6b563c 138extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
3affedc4
MN		 139 int nelems, enum dma_data_direction direction,
140 struct dma_attrs *attrs);
9b6b563c 141
fb3475e9
FT		 142extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
143 size_t size, dma_addr_t *dma_handle,
144 unsigned long mask, gfp_t flag, int node);
9b6b563c 145extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
12d04eef 146 void *vaddr, dma_addr_t dma_handle);
f9226d57
MN		 147extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
148 struct page *page, unsigned long offset,
149 size_t size, unsigned long mask,
150 enum dma_data_direction direction,
151 struct dma_attrs *attrs);
152extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
153 size_t size, enum dma_data_direction direction,
154 struct dma_attrs *attrs);
9b6b563c
PM		 155
156extern void iommu_init_early_pSeries(void);
1beb6a7d 157extern void iommu_init_early_dart(void);
31c56d82 158extern void iommu_init_early_pasemi(void);
9b6b563c 159
1beb6a7d 160extern void alloc_dart_table(void);
7e11580b
JB		 161#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
162static inline void iommu_save(void)
163{
164 if (ppc_md.iommu_save)
165 ppc_md.iommu_save();
166}
167
168static inline void iommu_restore(void)
169{
170 if (ppc_md.iommu_restore)
171 ppc_md.iommu_restore();
172}
173#endif
9b6b563c 174
4e13c1ac
AK		 175/* The API to support IOMMU operations for VFIO */
176extern int iommu_tce_clear_param_check(struct iommu_table *tbl,
177 unsigned long ioba, unsigned long tce_value,
178 unsigned long npages);
179extern int iommu_tce_put_param_check(struct iommu_table *tbl,
180 unsigned long ioba, unsigned long tce);
181extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
182 unsigned long hwaddr, enum dma_data_direction direction);
183extern unsigned long iommu_clear_tce(struct iommu_table *tbl,
184 unsigned long entry);
185extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl,
186 unsigned long entry, unsigned long pages);
187extern int iommu_put_tce_user_mode(struct iommu_table *tbl,
188 unsigned long entry, unsigned long tce);
189
190extern void iommu_flush_tce(struct iommu_table *tbl);
191extern int iommu_take_ownership(struct iommu_table *tbl);
192extern void iommu_release_ownership(struct iommu_table *tbl);
193
194extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
195
88ced031 196#endif /* __KERNEL__ */
9b6b563c 197#endif /* _ASM_IOMMU_H */
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