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,
86 DOMAIN_ATTR_NESTING, /* two stages of translation */
90 #ifdef CONFIG_IOMMU_API
93 * struct iommu_ops - iommu ops and capabilities
94 * @domain_init: init iommu domain
95 * @domain_destroy: destroy iommu domain
96 * @attach_dev: attach device to an iommu domain
97 * @detach_dev: detach device from an iommu domain
98 * @map: map a physically contiguous memory region to an iommu domain
99 * @unmap: unmap a physically contiguous memory region from an iommu domain
100 * @iova_to_phys: translate iova to physical address
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
106 * @priv: per-instance data private to the iommu driver
109 bool (*capable)(enum iommu_cap);
110 int (*domain_init)(struct iommu_domain *domain);
111 void (*domain_destroy)(struct iommu_domain *domain);
112 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
113 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
114 int (*map)(struct iommu_domain *domain, unsigned long iova,
115 phys_addr_t paddr, size_t size, int prot);
116 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
118 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
119 int (*add_device)(struct device *dev);
120 void (*remove_device)(struct device *dev);
121 int (*device_group)(struct device *dev, unsigned int *groupid);
122 int (*domain_get_attr)(struct iommu_domain *domain,
123 enum iommu_attr attr, void *data);
124 int (*domain_set_attr)(struct iommu_domain *domain,
125 enum iommu_attr attr, void *data);
127 /* Window handling functions */
128 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
129 phys_addr_t paddr, u64 size, int prot);
130 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
131 /* Set the numer of window per domain */
132 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
133 /* Get the numer of window per domain */
134 u32 (*domain_get_windows)(struct iommu_domain *domain);
136 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 void iommu_set_fault_handler(struct iommu_domain *domain,
163 iommu_fault_handler_t handler, void *token);
165 extern int iommu_attach_group(struct iommu_domain *domain,
166 struct iommu_group *group);
167 extern void iommu_detach_group(struct iommu_domain *domain,
168 struct iommu_group *group);
169 extern struct iommu_group *iommu_group_alloc(void);
170 extern void *iommu_group_get_iommudata(struct iommu_group *group);
171 extern void iommu_group_set_iommudata(struct iommu_group *group,
173 void (*release)(void *iommu_data));
174 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
175 extern int iommu_group_add_device(struct iommu_group *group,
177 extern void iommu_group_remove_device(struct device *dev);
178 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
179 int (*fn)(struct device *, void *));
180 extern struct iommu_group *iommu_group_get(struct device *dev);
181 extern void iommu_group_put(struct iommu_group *group);
182 extern int iommu_group_register_notifier(struct iommu_group *group,
183 struct notifier_block *nb);
184 extern int iommu_group_unregister_notifier(struct iommu_group *group,
185 struct notifier_block *nb);
186 extern int iommu_group_id(struct iommu_group *group);
187 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
189 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
191 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
193 struct device *iommu_device_create(struct device *parent, void *drvdata,
194 const struct attribute_group **groups,
195 const char *fmt, ...);
196 void iommu_device_destroy(struct device *dev);
197 int iommu_device_link(struct device *dev, struct device *link);
198 void iommu_device_unlink(struct device *dev, struct device *link);
200 /* Window handling function prototypes */
201 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
202 phys_addr_t offset, u64 size,
204 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
206 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
207 * @domain: the iommu domain where the fault has happened
208 * @dev: the device where the fault has happened
209 * @iova: the faulting address
210 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
212 * This function should be called by the low-level IOMMU implementations
213 * whenever IOMMU faults happen, to allow high-level users, that are
214 * interested in such events, to know about them.
216 * This event may be useful for several possible use cases:
217 * - mere logging of the event
218 * - dynamic TLB/PTE loading
219 * - if restarting of the faulting device is required
221 * Returns 0 on success and an appropriate error code otherwise (if dynamic
222 * PTE/TLB loading will one day be supported, implementations will be able
223 * to tell whether it succeeded or not according to this return value).
225 * Specifically, -ENOSYS is returned if a fault handler isn't installed
226 * (though fault handlers can also return -ENOSYS, in case they want to
227 * elicit the default behavior of the IOMMU drivers).
229 static inline int report_iommu_fault(struct iommu_domain *domain,
230 struct device *dev, unsigned long iova, int flags)
235 * if upper layers showed interest and installed a fault handler,
239 ret = domain->handler(domain, dev, iova, flags,
240 domain->handler_token);
242 trace_io_page_fault(dev, iova, flags);
246 #else /* CONFIG_IOMMU_API */
249 struct iommu_group {};
251 static inline bool iommu_present(struct bus_type *bus)
256 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
261 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
266 static inline struct iommu_group *iommu_group_get_by_id(int id)
271 static inline void iommu_domain_free(struct iommu_domain *domain)
275 static inline int iommu_attach_device(struct iommu_domain *domain,
281 static inline void iommu_detach_device(struct iommu_domain *domain,
286 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
287 phys_addr_t paddr, int gfp_order, int prot)
292 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
298 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
299 u32 wnd_nr, phys_addr_t paddr,
305 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
310 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
315 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
316 iommu_fault_handler_t handler, void *token)
320 static inline int iommu_attach_group(struct iommu_domain *domain,
321 struct iommu_group *group)
326 static inline void iommu_detach_group(struct iommu_domain *domain,
327 struct iommu_group *group)
331 static inline struct iommu_group *iommu_group_alloc(void)
333 return ERR_PTR(-ENODEV);
336 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
341 static inline void iommu_group_set_iommudata(struct iommu_group *group,
343 void (*release)(void *iommu_data))
347 static inline int iommu_group_set_name(struct iommu_group *group,
353 static inline int iommu_group_add_device(struct iommu_group *group,
359 static inline void iommu_group_remove_device(struct device *dev)
363 static inline int iommu_group_for_each_dev(struct iommu_group *group,
365 int (*fn)(struct device *, void *))
370 static inline struct iommu_group *iommu_group_get(struct device *dev)
375 static inline void iommu_group_put(struct iommu_group *group)
379 static inline int iommu_group_register_notifier(struct iommu_group *group,
380 struct notifier_block *nb)
385 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
386 struct notifier_block *nb)
391 static inline int iommu_group_id(struct iommu_group *group)
396 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
397 enum iommu_attr attr, void *data)
402 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
403 enum iommu_attr attr, void *data)
408 static inline struct device *iommu_device_create(struct device *parent,
410 const struct attribute_group **groups,
411 const char *fmt, ...)
413 return ERR_PTR(-ENODEV);
416 static inline void iommu_device_destroy(struct device *dev)
420 static inline int iommu_device_link(struct device *dev, struct device *link)
425 static inline void iommu_device_unlink(struct device *dev, struct device *link)
429 #endif /* CONFIG_IOMMU_API */
431 #endif /* __LINUX_IOMMU_H */