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 struct iommu_ops *ops;
55 iommu_fault_handler_t handler;
57 struct iommu_domain_geometry geometry;
60 #define IOMMU_CAP_CACHE_COHERENCY 0x1
61 #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
64 * Following constraints are specifc to FSL_PAMUV1:
65 * -aperture must be power of 2, and naturally aligned
66 * -number of windows must be power of 2, and address space size
67 * of each window is determined by aperture size / # of windows
68 * -the actual size of the mapped region of a window must be power
69 * of 2 starting with 4KB and physical address must be naturally
71 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
72 * The caller can invoke iommu_domain_get_attr to check if the underlying
73 * iommu implementation supports these constraints.
80 DOMAIN_ATTR_FSL_PAMU_STASH,
81 DOMAIN_ATTR_FSL_PAMU_ENABLE,
82 DOMAIN_ATTR_FSL_PAMUV1,
86 #ifdef CONFIG_IOMMU_API
89 * struct iommu_ops - iommu ops and capabilities
90 * @domain_init: init iommu domain
91 * @domain_destroy: destroy iommu domain
92 * @attach_dev: attach device to an iommu domain
93 * @detach_dev: detach device from an iommu domain
94 * @map: map a physically contiguous memory region to an iommu domain
95 * @unmap: unmap a physically contiguous memory region from an iommu domain
96 * @iova_to_phys: translate iova to physical address
97 * @domain_has_cap: domain capabilities query
98 * @add_device: add device to iommu grouping
99 * @remove_device: remove device from iommu grouping
100 * @domain_get_attr: Query domain attributes
101 * @domain_set_attr: Change domain attributes
102 * @pgsize_bitmap: bitmap of supported page sizes
105 int (*domain_init)(struct iommu_domain *domain);
106 void (*domain_destroy)(struct iommu_domain *domain);
107 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
108 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
109 int (*map)(struct iommu_domain *domain, unsigned long iova,
110 phys_addr_t paddr, size_t size, int prot);
111 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
113 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
114 int (*domain_has_cap)(struct iommu_domain *domain,
116 int (*add_device)(struct device *dev);
117 void (*remove_device)(struct device *dev);
118 int (*device_group)(struct device *dev, unsigned int *groupid);
119 int (*domain_get_attr)(struct iommu_domain *domain,
120 enum iommu_attr attr, void *data);
121 int (*domain_set_attr)(struct iommu_domain *domain,
122 enum iommu_attr attr, void *data);
124 /* Window handling functions */
125 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
126 phys_addr_t paddr, u64 size, int prot);
127 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
128 /* Set the numer of window per domain */
129 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
130 /* Get the numer of window per domain */
131 u32 (*domain_get_windows)(struct iommu_domain *domain);
133 unsigned long pgsize_bitmap;
136 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
137 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
138 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
139 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
140 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
141 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
143 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
144 extern bool iommu_present(struct bus_type *bus);
145 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
146 extern struct iommu_group *iommu_group_get_by_id(int id);
147 extern void iommu_domain_free(struct iommu_domain *domain);
148 extern int iommu_attach_device(struct iommu_domain *domain,
150 extern void iommu_detach_device(struct iommu_domain *domain,
152 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
153 phys_addr_t paddr, size_t size, int prot);
154 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
156 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
157 extern int iommu_domain_has_cap(struct iommu_domain *domain,
159 extern void iommu_set_fault_handler(struct iommu_domain *domain,
160 iommu_fault_handler_t handler, void *token);
162 extern int iommu_attach_group(struct iommu_domain *domain,
163 struct iommu_group *group);
164 extern void iommu_detach_group(struct iommu_domain *domain,
165 struct iommu_group *group);
166 extern struct iommu_group *iommu_group_alloc(void);
167 extern void *iommu_group_get_iommudata(struct iommu_group *group);
168 extern void iommu_group_set_iommudata(struct iommu_group *group,
170 void (*release)(void *iommu_data));
171 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
172 extern int iommu_group_add_device(struct iommu_group *group,
174 extern void iommu_group_remove_device(struct device *dev);
175 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
176 int (*fn)(struct device *, void *));
177 extern struct iommu_group *iommu_group_get(struct device *dev);
178 extern void iommu_group_put(struct iommu_group *group);
179 extern int iommu_group_register_notifier(struct iommu_group *group,
180 struct notifier_block *nb);
181 extern int iommu_group_unregister_notifier(struct iommu_group *group,
182 struct notifier_block *nb);
183 extern int iommu_group_id(struct iommu_group *group);
185 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
187 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
190 /* Window handling function prototypes */
191 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
192 phys_addr_t offset, u64 size,
194 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
196 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
197 * @domain: the iommu domain where the fault has happened
198 * @dev: the device where the fault has happened
199 * @iova: the faulting address
200 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
202 * This function should be called by the low-level IOMMU implementations
203 * whenever IOMMU faults happen, to allow high-level users, that are
204 * interested in such events, to know about them.
206 * This event may be useful for several possible use cases:
207 * - mere logging of the event
208 * - dynamic TLB/PTE loading
209 * - if restarting of the faulting device is required
211 * Returns 0 on success and an appropriate error code otherwise (if dynamic
212 * PTE/TLB loading will one day be supported, implementations will be able
213 * to tell whether it succeeded or not according to this return value).
215 * Specifically, -ENOSYS is returned if a fault handler isn't installed
216 * (though fault handlers can also return -ENOSYS, in case they want to
217 * elicit the default behavior of the IOMMU drivers).
219 static inline int report_iommu_fault(struct iommu_domain *domain,
220 struct device *dev, unsigned long iova, int flags)
225 * if upper layers showed interest and installed a fault handler,
229 ret = domain->handler(domain, dev, iova, flags,
230 domain->handler_token);
232 trace_io_page_fault(dev, iova, flags);
236 #else /* CONFIG_IOMMU_API */
239 struct iommu_group {};
241 static inline bool iommu_present(struct bus_type *bus)
246 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
251 static inline struct iommu_group *iommu_group_get_by_id(int id)
256 static inline void iommu_domain_free(struct iommu_domain *domain)
260 static inline int iommu_attach_device(struct iommu_domain *domain,
266 static inline void iommu_detach_device(struct iommu_domain *domain,
271 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
272 phys_addr_t paddr, int gfp_order, int prot)
277 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
283 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
284 u32 wnd_nr, phys_addr_t paddr,
290 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
295 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
300 static inline int iommu_domain_has_cap(struct iommu_domain *domain,
306 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
307 iommu_fault_handler_t handler, void *token)
311 static inline int iommu_attach_group(struct iommu_domain *domain,
312 struct iommu_group *group)
317 static inline void iommu_detach_group(struct iommu_domain *domain,
318 struct iommu_group *group)
322 static inline struct iommu_group *iommu_group_alloc(void)
324 return ERR_PTR(-ENODEV);
327 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
332 static inline void iommu_group_set_iommudata(struct iommu_group *group,
334 void (*release)(void *iommu_data))
338 static inline int iommu_group_set_name(struct iommu_group *group,
344 static inline int iommu_group_add_device(struct iommu_group *group,
350 static inline void iommu_group_remove_device(struct device *dev)
354 static inline int iommu_group_for_each_dev(struct iommu_group *group,
356 int (*fn)(struct device *, void *))
361 static inline struct iommu_group *iommu_group_get(struct device *dev)
366 static inline void iommu_group_put(struct iommu_group *group)
370 static inline int iommu_group_register_notifier(struct iommu_group *group,
371 struct notifier_block *nb)
376 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
377 struct notifier_block *nb)
382 static inline int iommu_group_id(struct iommu_group *group)
387 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
388 enum iommu_attr attr, void *data)
393 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
394 enum iommu_attr attr, void *data)
399 #endif /* CONFIG_IOMMU_API */
401 #endif /* __LINUX_IOMMU_H */