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TOMOYO Linux Cross Reference
Linux/include/linux/iommu.h

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  1 /*
  2  * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
  3  * Author: Joerg Roedel <joerg.roedel@amd.com>
  4  *
  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.
  8  *
  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.
 13  *
 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
 17  */
 18 
 19 #ifndef __LINUX_IOMMU_H
 20 #define __LINUX_IOMMU_H
 21 
 22 #include <linux/errno.h>
 23 
 24 #define IOMMU_READ      (1)
 25 #define IOMMU_WRITE     (2)
 26 #define IOMMU_CACHE     (4) /* DMA cache coherency */
 27 
 28 struct iommu_ops;
 29 struct bus_type;
 30 struct device;
 31 struct iommu_domain;
 32 
 33 /* iommu fault flags */
 34 #define IOMMU_FAULT_READ        0x0
 35 #define IOMMU_FAULT_WRITE       0x1
 36 
 37 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
 38                                 struct device *, unsigned long, int);
 39 
 40 struct iommu_domain {
 41         struct iommu_ops *ops;
 42         void *priv;
 43         iommu_fault_handler_t handler;
 44 };
 45 
 46 #define IOMMU_CAP_CACHE_COHERENCY       0x1
 47 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
 48 
 49 #ifdef CONFIG_IOMMU_API
 50 
 51 /**
 52  * struct iommu_ops - iommu ops and capabilities
 53  * @domain_init: init iommu domain
 54  * @domain_destroy: destroy iommu domain
 55  * @attach_dev: attach device to an iommu domain
 56  * @detach_dev: detach device from an iommu domain
 57  * @map: map a physically contiguous memory region to an iommu domain
 58  * @unmap: unmap a physically contiguous memory region from an iommu domain
 59  * @iova_to_phys: translate iova to physical address
 60  * @domain_has_cap: domain capabilities query
 61  * @commit: commit iommu domain
 62  * @pgsize_bitmap: bitmap of supported page sizes
 63  */
 64 struct iommu_ops {
 65         int (*domain_init)(struct iommu_domain *domain);
 66         void (*domain_destroy)(struct iommu_domain *domain);
 67         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 68         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 69         int (*map)(struct iommu_domain *domain, unsigned long iova,
 70                    phys_addr_t paddr, size_t size, int prot);
 71         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
 72                      size_t size);
 73         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
 74                                     unsigned long iova);
 75         int (*domain_has_cap)(struct iommu_domain *domain,
 76                               unsigned long cap);
 77         int (*device_group)(struct device *dev, unsigned int *groupid);
 78         unsigned long pgsize_bitmap;
 79 };
 80 
 81 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
 82 extern bool iommu_present(struct bus_type *bus);
 83 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 84 extern void iommu_domain_free(struct iommu_domain *domain);
 85 extern int iommu_attach_device(struct iommu_domain *domain,
 86                                struct device *dev);
 87 extern void iommu_detach_device(struct iommu_domain *domain,
 88                                 struct device *dev);
 89 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 90                      phys_addr_t paddr, size_t size, int prot);
 91 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 92                        size_t size);
 93 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 94                                       unsigned long iova);
 95 extern int iommu_domain_has_cap(struct iommu_domain *domain,
 96                                 unsigned long cap);
 97 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 98                                         iommu_fault_handler_t handler);
 99 extern int iommu_device_group(struct device *dev, unsigned int *groupid);
100 
101 /**
102  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
103  * @domain: the iommu domain where the fault has happened
104  * @dev: the device where the fault has happened
105  * @iova: the faulting address
106  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
107  *
108  * This function should be called by the low-level IOMMU implementations
109  * whenever IOMMU faults happen, to allow high-level users, that are
110  * interested in such events, to know about them.
111  *
112  * This event may be useful for several possible use cases:
113  * - mere logging of the event
114  * - dynamic TLB/PTE loading
115  * - if restarting of the faulting device is required
116  *
117  * Returns 0 on success and an appropriate error code otherwise (if dynamic
118  * PTE/TLB loading will one day be supported, implementations will be able
119  * to tell whether it succeeded or not according to this return value).
120  *
121  * Specifically, -ENOSYS is returned if a fault handler isn't installed
122  * (though fault handlers can also return -ENOSYS, in case they want to
123  * elicit the default behavior of the IOMMU drivers).
124  */
125 static inline int report_iommu_fault(struct iommu_domain *domain,
126                 struct device *dev, unsigned long iova, int flags)
127 {
128         int ret = -ENOSYS;
129 
130         /*
131          * if upper layers showed interest and installed a fault handler,
132          * invoke it.
133          */
134         if (domain->handler)
135                 ret = domain->handler(domain, dev, iova, flags);
136 
137         return ret;
138 }
139 
140 #else /* CONFIG_IOMMU_API */
141 
142 struct iommu_ops {};
143 
144 static inline bool iommu_present(struct bus_type *bus)
145 {
146         return false;
147 }
148 
149 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
150 {
151         return NULL;
152 }
153 
154 static inline void iommu_domain_free(struct iommu_domain *domain)
155 {
156 }
157 
158 static inline int iommu_attach_device(struct iommu_domain *domain,
159                                       struct device *dev)
160 {
161         return -ENODEV;
162 }
163 
164 static inline void iommu_detach_device(struct iommu_domain *domain,
165                                        struct device *dev)
166 {
167 }
168 
169 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
170                             phys_addr_t paddr, int gfp_order, int prot)
171 {
172         return -ENODEV;
173 }
174 
175 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
176                               int gfp_order)
177 {
178         return -ENODEV;
179 }
180 
181 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
182                                              unsigned long iova)
183 {
184         return 0;
185 }
186 
187 static inline int domain_has_cap(struct iommu_domain *domain,
188                                  unsigned long cap)
189 {
190         return 0;
191 }
192 
193 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
194                                         iommu_fault_handler_t handler)
195 {
196 }
197 
198 static inline int iommu_device_group(struct device *dev, unsigned int *groupid)
199 {
200         return -ENODEV;
201 }
202 
203 #endif /* CONFIG_IOMMU_API */
204 
205 #endif /* __LINUX_IOMMU_H */
206 

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