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>
23 #include <linux/err.h>
24 #include <linux/types.h>
26 #define IOMMU_READ (1)
27 #define IOMMU_WRITE (2)
28 #define IOMMU_CACHE (4) /* DMA cache coherency */
35 struct notifier_block;
37 /* iommu fault flags */
38 #define IOMMU_FAULT_READ 0x0
39 #define IOMMU_FAULT_WRITE 0x1
41 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
42 struct device *, unsigned long, int, void *);
44 struct iommu_domain_geometry {
45 dma_addr_t aperture_start; /* First address that can be mapped */
46 dma_addr_t aperture_end; /* Last address that can be mapped */
47 bool force_aperture; /* DMA only allowed in mappable range? */
51 struct iommu_ops *ops;
53 iommu_fault_handler_t handler;
55 struct iommu_domain_geometry geometry;
58 #define IOMMU_CAP_CACHE_COHERENCY 0x1
59 #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
68 #ifdef CONFIG_IOMMU_API
71 * struct iommu_ops - iommu ops and capabilities
72 * @domain_init: init iommu domain
73 * @domain_destroy: destroy iommu domain
74 * @attach_dev: attach device to an iommu domain
75 * @detach_dev: detach device from an iommu domain
76 * @map: map a physically contiguous memory region to an iommu domain
77 * @unmap: unmap a physically contiguous memory region from an iommu domain
78 * @iova_to_phys: translate iova to physical address
79 * @domain_has_cap: domain capabilities query
80 * @add_device: add device to iommu grouping
81 * @remove_device: remove device from iommu grouping
82 * @domain_get_attr: Query domain attributes
83 * @domain_set_attr: Change domain attributes
84 * @pgsize_bitmap: bitmap of supported page sizes
87 int (*domain_init)(struct iommu_domain *domain);
88 void (*domain_destroy)(struct iommu_domain *domain);
89 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
90 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
91 int (*map)(struct iommu_domain *domain, unsigned long iova,
92 phys_addr_t paddr, size_t size, int prot);
93 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
95 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
96 int (*domain_has_cap)(struct iommu_domain *domain,
98 int (*add_device)(struct device *dev);
99 void (*remove_device)(struct device *dev);
100 int (*device_group)(struct device *dev, unsigned int *groupid);
101 int (*domain_get_attr)(struct iommu_domain *domain,
102 enum iommu_attr attr, void *data);
103 int (*domain_set_attr)(struct iommu_domain *domain,
104 enum iommu_attr attr, void *data);
106 /* Window handling functions */
107 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
108 phys_addr_t paddr, u64 size, int prot);
109 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
110 /* Set the numer of window per domain */
111 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
112 /* Get the numer of window per domain */
113 u32 (*domain_get_windows)(struct iommu_domain *domain);
115 unsigned long pgsize_bitmap;
118 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
119 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
120 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
121 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
122 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
123 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
125 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
126 extern bool iommu_present(struct bus_type *bus);
127 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
128 extern struct iommu_group *iommu_group_get_by_id(int id);
129 extern void iommu_domain_free(struct iommu_domain *domain);
130 extern int iommu_attach_device(struct iommu_domain *domain,
132 extern void iommu_detach_device(struct iommu_domain *domain,
134 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
135 phys_addr_t paddr, size_t size, int prot);
136 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
138 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
139 extern int iommu_domain_has_cap(struct iommu_domain *domain,
141 extern void iommu_set_fault_handler(struct iommu_domain *domain,
142 iommu_fault_handler_t handler, void *token);
144 extern int iommu_attach_group(struct iommu_domain *domain,
145 struct iommu_group *group);
146 extern void iommu_detach_group(struct iommu_domain *domain,
147 struct iommu_group *group);
148 extern struct iommu_group *iommu_group_alloc(void);
149 extern void *iommu_group_get_iommudata(struct iommu_group *group);
150 extern void iommu_group_set_iommudata(struct iommu_group *group,
152 void (*release)(void *iommu_data));
153 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
154 extern int iommu_group_add_device(struct iommu_group *group,
156 extern void iommu_group_remove_device(struct device *dev);
157 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
158 int (*fn)(struct device *, void *));
159 extern struct iommu_group *iommu_group_get(struct device *dev);
160 extern void iommu_group_put(struct iommu_group *group);
161 extern int iommu_group_register_notifier(struct iommu_group *group,
162 struct notifier_block *nb);
163 extern int iommu_group_unregister_notifier(struct iommu_group *group,
164 struct notifier_block *nb);
165 extern int iommu_group_id(struct iommu_group *group);
167 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
169 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
172 /* Window handling function prototypes */
173 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
174 phys_addr_t offset, u64 size,
176 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
178 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
179 * @domain: the iommu domain where the fault has happened
180 * @dev: the device where the fault has happened
181 * @iova: the faulting address
182 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
184 * This function should be called by the low-level IOMMU implementations
185 * whenever IOMMU faults happen, to allow high-level users, that are
186 * interested in such events, to know about them.
188 * This event may be useful for several possible use cases:
189 * - mere logging of the event
190 * - dynamic TLB/PTE loading
191 * - if restarting of the faulting device is required
193 * Returns 0 on success and an appropriate error code otherwise (if dynamic
194 * PTE/TLB loading will one day be supported, implementations will be able
195 * to tell whether it succeeded or not according to this return value).
197 * Specifically, -ENOSYS is returned if a fault handler isn't installed
198 * (though fault handlers can also return -ENOSYS, in case they want to
199 * elicit the default behavior of the IOMMU drivers).
201 static inline int report_iommu_fault(struct iommu_domain *domain,
202 struct device *dev, unsigned long iova, int flags)
207 * if upper layers showed interest and installed a fault handler,
211 ret = domain->handler(domain, dev, iova, flags,
212 domain->handler_token);
217 #else /* CONFIG_IOMMU_API */
220 struct iommu_group {};
222 static inline bool iommu_present(struct bus_type *bus)
227 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
232 static inline void iommu_domain_free(struct iommu_domain *domain)
236 static inline int iommu_attach_device(struct iommu_domain *domain,
242 static inline void iommu_detach_device(struct iommu_domain *domain,
247 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
248 phys_addr_t paddr, int gfp_order, int prot)
253 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
259 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
260 u32 wnd_nr, phys_addr_t paddr,
266 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
271 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
276 static inline int domain_has_cap(struct iommu_domain *domain,
282 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
283 iommu_fault_handler_t handler, void *token)
287 static inline int iommu_attach_group(struct iommu_domain *domain,
288 struct iommu_group *group)
293 static inline void iommu_detach_group(struct iommu_domain *domain,
294 struct iommu_group *group)
298 static inline struct iommu_group *iommu_group_alloc(void)
300 return ERR_PTR(-ENODEV);
303 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
308 static inline void iommu_group_set_iommudata(struct iommu_group *group,
310 void (*release)(void *iommu_data))
314 static inline int iommu_group_set_name(struct iommu_group *group,
320 static inline int iommu_group_add_device(struct iommu_group *group,
326 static inline void iommu_group_remove_device(struct device *dev)
330 static inline int iommu_group_for_each_dev(struct iommu_group *group,
332 int (*fn)(struct device *, void *))
337 static inline struct iommu_group *iommu_group_get(struct device *dev)
342 static inline void iommu_group_put(struct iommu_group *group)
346 static inline int iommu_group_register_notifier(struct iommu_group *group,
347 struct notifier_block *nb)
352 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
353 struct notifier_block *nb)
358 static inline int iommu_group_id(struct iommu_group *group)
363 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
364 enum iommu_attr attr, void *data)
369 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
370 enum iommu_attr attr, void *data)
375 #endif /* CONFIG_IOMMU_API */
377 #endif /* __LINUX_IOMMU_H */