2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
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.
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.
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
19 #ifndef __LINUX_IOMMU_H
20 #define __LINUX_IOMMU_H
22 #include <linux/errno.h>
24 #define IOMMU_READ (1)
25 #define IOMMU_WRITE (2)
26 #define IOMMU_CACHE (4) /* DMA cache coherency */
34 /* iommu fault flags */
35 #define IOMMU_FAULT_READ 0x0
36 #define IOMMU_FAULT_WRITE 0x1
38 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
39 struct device *, unsigned long, int, void *);
42 struct iommu_ops *ops;
44 iommu_fault_handler_t handler;
48 #define IOMMU_CAP_CACHE_COHERENCY 0x1
49 #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
51 #ifdef CONFIG_IOMMU_API
54 * struct iommu_ops - iommu ops and capabilities
55 * @domain_init: init iommu domain
56 * @domain_destroy: destroy iommu domain
57 * @attach_dev: attach device to an iommu domain
58 * @detach_dev: detach device from an iommu domain
59 * @map: map a physically contiguous memory region to an iommu domain
60 * @unmap: unmap a physically contiguous memory region from an iommu domain
61 * @iova_to_phys: translate iova to physical address
62 * @domain_has_cap: domain capabilities query
63 * @commit: commit iommu domain
64 * @add_device: add device to iommu grouping
65 * @remove_device: remove device from iommu grouping
66 * @pgsize_bitmap: bitmap of supported page sizes
69 int (*domain_init)(struct iommu_domain *domain);
70 void (*domain_destroy)(struct iommu_domain *domain);
71 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
72 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
73 int (*map)(struct iommu_domain *domain, unsigned long iova,
74 phys_addr_t paddr, size_t size, int prot);
75 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
77 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
79 int (*domain_has_cap)(struct iommu_domain *domain,
81 int (*add_device)(struct device *dev);
82 void (*remove_device)(struct device *dev);
83 unsigned long pgsize_bitmap;
86 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
87 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
88 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
89 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
90 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
91 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
93 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
94 extern bool iommu_present(struct bus_type *bus);
95 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
96 extern void iommu_domain_free(struct iommu_domain *domain);
97 extern int iommu_attach_device(struct iommu_domain *domain,
99 extern void iommu_detach_device(struct iommu_domain *domain,
101 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
102 phys_addr_t paddr, size_t size, int prot);
103 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
105 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
107 extern int iommu_domain_has_cap(struct iommu_domain *domain,
109 extern void iommu_set_fault_handler(struct iommu_domain *domain,
110 iommu_fault_handler_t handler, void *token);
112 extern int iommu_attach_group(struct iommu_domain *domain,
113 struct iommu_group *group);
114 extern void iommu_detach_group(struct iommu_domain *domain,
115 struct iommu_group *group);
116 extern struct iommu_group *iommu_group_alloc(void);
117 extern void *iommu_group_get_iommudata(struct iommu_group *group);
118 extern void iommu_group_set_iommudata(struct iommu_group *group,
120 void (*release)(void *iommu_data));
121 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
122 extern int iommu_group_add_device(struct iommu_group *group,
124 extern void iommu_group_remove_device(struct device *dev);
125 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
126 int (*fn)(struct device *, void *));
127 extern struct iommu_group *iommu_group_get(struct device *dev);
128 extern void iommu_group_put(struct iommu_group *group);
129 extern int iommu_group_register_notifier(struct iommu_group *group,
130 struct notifier_block *nb);
131 extern int iommu_group_unregister_notifier(struct iommu_group *group,
132 struct notifier_block *nb);
133 extern int iommu_group_id(struct iommu_group *group);
136 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
137 * @domain: the iommu domain where the fault has happened
138 * @dev: the device where the fault has happened
139 * @iova: the faulting address
140 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
142 * This function should be called by the low-level IOMMU implementations
143 * whenever IOMMU faults happen, to allow high-level users, that are
144 * interested in such events, to know about them.
146 * This event may be useful for several possible use cases:
147 * - mere logging of the event
148 * - dynamic TLB/PTE loading
149 * - if restarting of the faulting device is required
151 * Returns 0 on success and an appropriate error code otherwise (if dynamic
152 * PTE/TLB loading will one day be supported, implementations will be able
153 * to tell whether it succeeded or not according to this return value).
155 * Specifically, -ENOSYS is returned if a fault handler isn't installed
156 * (though fault handlers can also return -ENOSYS, in case they want to
157 * elicit the default behavior of the IOMMU drivers).
159 static inline int report_iommu_fault(struct iommu_domain *domain,
160 struct device *dev, unsigned long iova, int flags)
165 * if upper layers showed interest and installed a fault handler,
169 ret = domain->handler(domain, dev, iova, flags,
170 domain->handler_token);
175 #else /* CONFIG_IOMMU_API */
178 struct iommu_group {};
180 static inline bool iommu_present(struct bus_type *bus)
185 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
190 static inline void iommu_domain_free(struct iommu_domain *domain)
194 static inline int iommu_attach_device(struct iommu_domain *domain,
200 static inline void iommu_detach_device(struct iommu_domain *domain,
205 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
206 phys_addr_t paddr, int gfp_order, int prot)
211 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
217 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
223 static inline int domain_has_cap(struct iommu_domain *domain,
229 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
230 iommu_fault_handler_t handler, void *token)
234 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
239 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
243 struct iommu_group *iommu_group_alloc(void)
245 return ERR_PTR(-ENODEV);
248 void *iommu_group_get_iommudata(struct iommu_group *group)
253 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
254 void (*release)(void *iommu_data))
258 int iommu_group_set_name(struct iommu_group *group, const char *name)
263 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
268 void iommu_group_remove_device(struct device *dev)
272 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
273 int (*fn)(struct device *, void *))
278 struct iommu_group *iommu_group_get(struct device *dev)
283 void iommu_group_put(struct iommu_group *group)
287 int iommu_group_register_notifier(struct iommu_group *group,
288 struct notifier_block *nb)
293 int iommu_group_unregister_notifier(struct iommu_group *group,
294 struct notifier_block *nb)
299 int iommu_group_id(struct iommu_group *group)
303 #endif /* CONFIG_IOMMU_API */
305 #endif /* __LINUX_IOMMU_H */