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>
25 #include <trace/events/iommu.h>
27 #define IOMMU_READ (1 << 0)
28 #define IOMMU_WRITE (1 << 1)
29 #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
30 #define IOMMU_EXEC (1 << 3)
37 struct notifier_block;
39 /* iommu fault flags */
40 #define IOMMU_FAULT_READ 0x0
41 #define IOMMU_FAULT_WRITE 0x1
43 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
44 struct device *, unsigned long, int, void *);
46 struct iommu_domain_geometry {
47 dma_addr_t aperture_start; /* First address that can be mapped */
48 dma_addr_t aperture_end; /* Last address that can be mapped */
49 bool force_aperture; /* DMA only allowed in mappable range? */
53 const struct iommu_ops *ops;
55 iommu_fault_handler_t handler;
57 struct iommu_domain_geometry geometry;
61 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
63 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
67 * Following constraints are specifc to FSL_PAMUV1:
68 * -aperture must be power of 2, and naturally aligned
69 * -number of windows must be power of 2, and address space size
70 * of each window is determined by aperture size / # of windows
71 * -the actual size of the mapped region of a window must be power
72 * of 2 starting with 4KB and physical address must be naturally
74 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
75 * The caller can invoke iommu_domain_get_attr to check if the underlying
76 * iommu implementation supports these constraints.
83 DOMAIN_ATTR_FSL_PAMU_STASH,
84 DOMAIN_ATTR_FSL_PAMU_ENABLE,
85 DOMAIN_ATTR_FSL_PAMUV1,
89 #ifdef CONFIG_IOMMU_API
92 * struct iommu_ops - iommu ops and capabilities
93 * @domain_init: init iommu domain
94 * @domain_destroy: destroy iommu domain
95 * @attach_dev: attach device to an iommu domain
96 * @detach_dev: detach device from an iommu domain
97 * @map: map a physically contiguous memory region to an iommu domain
98 * @unmap: unmap a physically contiguous memory region from an iommu domain
99 * @iova_to_phys: translate iova to physical address
100 * @domain_has_cap: domain capabilities query
101 * @add_device: add device to iommu grouping
102 * @remove_device: remove device from iommu grouping
103 * @domain_get_attr: Query domain attributes
104 * @domain_set_attr: Change domain attributes
105 * @pgsize_bitmap: bitmap of supported page sizes
108 bool (*capable)(enum iommu_cap);
109 int (*domain_init)(struct iommu_domain *domain);
110 void (*domain_destroy)(struct iommu_domain *domain);
111 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
112 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
113 int (*map)(struct iommu_domain *domain, unsigned long iova,
114 phys_addr_t paddr, size_t size, int prot);
115 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
117 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
118 int (*domain_has_cap)(struct iommu_domain *domain,
120 int (*add_device)(struct device *dev);
121 void (*remove_device)(struct device *dev);
122 int (*device_group)(struct device *dev, unsigned int *groupid);
123 int (*domain_get_attr)(struct iommu_domain *domain,
124 enum iommu_attr attr, void *data);
125 int (*domain_set_attr)(struct iommu_domain *domain,
126 enum iommu_attr attr, void *data);
128 /* Window handling functions */
129 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
130 phys_addr_t paddr, u64 size, int prot);
131 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
132 /* Set the numer of window per domain */
133 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
134 /* Get the numer of window per domain */
135 u32 (*domain_get_windows)(struct iommu_domain *domain);
137 unsigned long pgsize_bitmap;
140 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
141 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
142 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
143 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
144 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
145 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
147 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
148 extern bool iommu_present(struct bus_type *bus);
149 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
150 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
151 extern struct iommu_group *iommu_group_get_by_id(int id);
152 extern void iommu_domain_free(struct iommu_domain *domain);
153 extern int iommu_attach_device(struct iommu_domain *domain,
155 extern void iommu_detach_device(struct iommu_domain *domain,
157 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
158 phys_addr_t paddr, size_t size, int prot);
159 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
161 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
162 extern int iommu_domain_has_cap(struct iommu_domain *domain,
164 extern void iommu_set_fault_handler(struct iommu_domain *domain,
165 iommu_fault_handler_t handler, void *token);
167 extern int iommu_attach_group(struct iommu_domain *domain,
168 struct iommu_group *group);
169 extern void iommu_detach_group(struct iommu_domain *domain,
170 struct iommu_group *group);
171 extern struct iommu_group *iommu_group_alloc(void);
172 extern void *iommu_group_get_iommudata(struct iommu_group *group);
173 extern void iommu_group_set_iommudata(struct iommu_group *group,
175 void (*release)(void *iommu_data));
176 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
177 extern int iommu_group_add_device(struct iommu_group *group,
179 extern void iommu_group_remove_device(struct device *dev);
180 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
181 int (*fn)(struct device *, void *));
182 extern struct iommu_group *iommu_group_get(struct device *dev);
183 extern void iommu_group_put(struct iommu_group *group);
184 extern int iommu_group_register_notifier(struct iommu_group *group,
185 struct notifier_block *nb);
186 extern int iommu_group_unregister_notifier(struct iommu_group *group,
187 struct notifier_block *nb);
188 extern int iommu_group_id(struct iommu_group *group);
189 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
191 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
193 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
195 struct device *iommu_device_create(struct device *parent, void *drvdata,
196 const struct attribute_group **groups,
197 const char *fmt, ...);
198 void iommu_device_destroy(struct device *dev);
199 int iommu_device_link(struct device *dev, struct device *link);
200 void iommu_device_unlink(struct device *dev, struct device *link);
202 /* Window handling function prototypes */
203 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
204 phys_addr_t offset, u64 size,
206 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
208 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
209 * @domain: the iommu domain where the fault has happened
210 * @dev: the device where the fault has happened
211 * @iova: the faulting address
212 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
214 * This function should be called by the low-level IOMMU implementations
215 * whenever IOMMU faults happen, to allow high-level users, that are
216 * interested in such events, to know about them.
218 * This event may be useful for several possible use cases:
219 * - mere logging of the event
220 * - dynamic TLB/PTE loading
221 * - if restarting of the faulting device is required
223 * Returns 0 on success and an appropriate error code otherwise (if dynamic
224 * PTE/TLB loading will one day be supported, implementations will be able
225 * to tell whether it succeeded or not according to this return value).
227 * Specifically, -ENOSYS is returned if a fault handler isn't installed
228 * (though fault handlers can also return -ENOSYS, in case they want to
229 * elicit the default behavior of the IOMMU drivers).
231 static inline int report_iommu_fault(struct iommu_domain *domain,
232 struct device *dev, unsigned long iova, int flags)
237 * if upper layers showed interest and installed a fault handler,
241 ret = domain->handler(domain, dev, iova, flags,
242 domain->handler_token);
244 trace_io_page_fault(dev, iova, flags);
248 #else /* CONFIG_IOMMU_API */
251 struct iommu_group {};
253 static inline bool iommu_present(struct bus_type *bus)
258 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
263 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
268 static inline struct iommu_group *iommu_group_get_by_id(int id)
273 static inline void iommu_domain_free(struct iommu_domain *domain)
277 static inline int iommu_attach_device(struct iommu_domain *domain,
283 static inline void iommu_detach_device(struct iommu_domain *domain,
288 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
289 phys_addr_t paddr, int gfp_order, int prot)
294 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
300 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
301 u32 wnd_nr, phys_addr_t paddr,
307 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
312 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
317 static inline int iommu_domain_has_cap(struct iommu_domain *domain,
323 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
324 iommu_fault_handler_t handler, void *token)
328 static inline int iommu_attach_group(struct iommu_domain *domain,
329 struct iommu_group *group)
334 static inline void iommu_detach_group(struct iommu_domain *domain,
335 struct iommu_group *group)
339 static inline struct iommu_group *iommu_group_alloc(void)
341 return ERR_PTR(-ENODEV);
344 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
349 static inline void iommu_group_set_iommudata(struct iommu_group *group,
351 void (*release)(void *iommu_data))
355 static inline int iommu_group_set_name(struct iommu_group *group,
361 static inline int iommu_group_add_device(struct iommu_group *group,
367 static inline void iommu_group_remove_device(struct device *dev)
371 static inline int iommu_group_for_each_dev(struct iommu_group *group,
373 int (*fn)(struct device *, void *))
378 static inline struct iommu_group *iommu_group_get(struct device *dev)
383 static inline void iommu_group_put(struct iommu_group *group)
387 static inline int iommu_group_register_notifier(struct iommu_group *group,
388 struct notifier_block *nb)
393 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
394 struct notifier_block *nb)
399 static inline int iommu_group_id(struct iommu_group *group)
404 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
405 enum iommu_attr attr, void *data)
410 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
411 enum iommu_attr attr, void *data)
416 static inline struct device *iommu_device_create(struct device *parent,
418 const struct attribute_group **groups,
419 const char *fmt, ...)
421 return ERR_PTR(-ENODEV);
424 static inline void iommu_device_destroy(struct device *dev)
428 static inline int iommu_device_link(struct device *dev, struct device *link)
433 static inline void iommu_device_unlink(struct device *dev, struct device *link)
437 #endif /* CONFIG_IOMMU_API */
439 #endif /* __LINUX_IOMMU_H */