1 /*
2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include <linux/bug.h>
20 #include <linux/types.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/iommu.h>
25
26 static struct iommu_ops *iommu_ops;
27
register_iommu(struct iommu_ops * ops)28 void register_iommu(struct iommu_ops *ops)
29 {
30 if (iommu_ops)
31 BUG();
32
33 iommu_ops = ops;
34 }
35
iommu_found(void)36 bool iommu_found(void)
37 {
38 return iommu_ops != NULL;
39 }
40 EXPORT_SYMBOL_GPL(iommu_found);
41
iommu_domain_alloc(void)42 struct iommu_domain *iommu_domain_alloc(void)
43 {
44 struct iommu_domain *domain;
45 int ret;
46
47 domain = kmalloc(sizeof(*domain), GFP_KERNEL);
48 if (!domain)
49 return NULL;
50
51 ret = iommu_ops->domain_init(domain);
52 if (ret)
53 goto out_free;
54
55 return domain;
56
57 out_free:
58 kfree(domain);
59
60 return NULL;
61 }
62 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
63
iommu_domain_free(struct iommu_domain * domain)64 void iommu_domain_free(struct iommu_domain *domain)
65 {
66 iommu_ops->domain_destroy(domain);
67 kfree(domain);
68 }
69 EXPORT_SYMBOL_GPL(iommu_domain_free);
70
iommu_attach_device(struct iommu_domain * domain,struct device * dev)71 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
72 {
73 return iommu_ops->attach_dev(domain, dev);
74 }
75 EXPORT_SYMBOL_GPL(iommu_attach_device);
76
iommu_detach_device(struct iommu_domain * domain,struct device * dev)77 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
78 {
79 iommu_ops->detach_dev(domain, dev);
80 }
81 EXPORT_SYMBOL_GPL(iommu_detach_device);
82
iommu_iova_to_phys(struct iommu_domain * domain,unsigned long iova)83 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
84 unsigned long iova)
85 {
86 return iommu_ops->iova_to_phys(domain, iova);
87 }
88 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
89
iommu_domain_has_cap(struct iommu_domain * domain,unsigned long cap)90 int iommu_domain_has_cap(struct iommu_domain *domain,
91 unsigned long cap)
92 {
93 return iommu_ops->domain_has_cap(domain, cap);
94 }
95 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
96
iommu_map(struct iommu_domain * domain,unsigned long iova,phys_addr_t paddr,int gfp_order,int prot)97 int iommu_map(struct iommu_domain *domain, unsigned long iova,
98 phys_addr_t paddr, int gfp_order, int prot)
99 {
100 unsigned long invalid_mask;
101 size_t size;
102
103 size = 0x1000UL << gfp_order;
104 invalid_mask = size - 1;
105
106 BUG_ON((iova | paddr) & invalid_mask);
107
108 return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
109 }
110 EXPORT_SYMBOL_GPL(iommu_map);
111
iommu_unmap(struct iommu_domain * domain,unsigned long iova,int gfp_order)112 int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
113 {
114 unsigned long invalid_mask;
115 size_t size;
116
117 size = 0x1000UL << gfp_order;
118 invalid_mask = size - 1;
119
120 BUG_ON(iova & invalid_mask);
121
122 return iommu_ops->unmap(domain, iova, gfp_order);
123 }
124 EXPORT_SYMBOL_GPL(iommu_unmap);
125