2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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/scatterlist.h>
23 #include <linux/device.h>
24 #include <linux/types.h>
25 #include <linux/errno.h>
26 #include <linux/err.h>
29 #define IOMMU_READ (1 << 0)
30 #define IOMMU_WRITE (1 << 1)
31 #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
32 #define IOMMU_NOEXEC (1 << 3)
33 #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
35 * Where the bus hardware includes a privilege level as part of its access type
36 * markings, and certain devices are capable of issuing transactions marked as
37 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
38 * given permission flags only apply to accesses at the higher privilege level,
39 * and that unprivileged transactions should have as little access as possible.
40 * This would usually imply the same permissions as kernel mappings on the CPU,
41 * if the IOMMU page table format is equivalent.
43 #define IOMMU_PRIV (1 << 5)
50 struct notifier_block;
52 /* iommu fault flags */
53 #define IOMMU_FAULT_READ 0x0
54 #define IOMMU_FAULT_WRITE 0x1
56 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
57 struct device *, unsigned long, int, void *);
59 struct iommu_domain_geometry {
60 dma_addr_t aperture_start; /* First address that can be mapped */
61 dma_addr_t aperture_end; /* Last address that can be mapped */
62 bool force_aperture; /* DMA only allowed in mappable range? */
65 /* Domain feature flags */
66 #define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
67 #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
69 #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
72 * This are the possible domain-types
74 * IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
76 * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
77 * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
79 * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
80 * This flag allows IOMMU drivers to implement
81 * certain optimizations for these domains
83 #define IOMMU_DOMAIN_BLOCKED (0U)
84 #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
85 #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
86 #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
87 __IOMMU_DOMAIN_DMA_API)
91 const struct iommu_ops *ops;
92 unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */
93 iommu_fault_handler_t handler;
95 struct iommu_domain_geometry geometry;
100 IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
102 IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
103 IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
107 * Following constraints are specifc to FSL_PAMUV1:
108 * -aperture must be power of 2, and naturally aligned
109 * -number of windows must be power of 2, and address space size
110 * of each window is determined by aperture size / # of windows
111 * -the actual size of the mapped region of a window must be power
112 * of 2 starting with 4KB and physical address must be naturally
114 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
115 * The caller can invoke iommu_domain_get_attr to check if the underlying
116 * iommu implementation supports these constraints.
120 DOMAIN_ATTR_GEOMETRY,
123 DOMAIN_ATTR_FSL_PAMU_STASH,
124 DOMAIN_ATTR_FSL_PAMU_ENABLE,
125 DOMAIN_ATTR_FSL_PAMUV1,
126 DOMAIN_ATTR_NESTING, /* two stages of translation */
130 /* These are the possible reserved region types */
131 enum iommu_resv_type {
132 /* Memory regions which must be mapped 1:1 at all times */
134 /* Arbitrary "never map this or give it to a device" address ranges */
136 /* Hardware MSI region (untranslated) */
138 /* Software-managed MSI translation window */
143 * struct iommu_resv_region - descriptor for a reserved memory region
144 * @list: Linked list pointers
145 * @start: System physical start address of the region
146 * @length: Length of the region in bytes
147 * @prot: IOMMU Protection flags (READ/WRITE/...)
148 * @type: Type of the reserved region
150 struct iommu_resv_region {
151 struct list_head list;
155 enum iommu_resv_type type;
158 #ifdef CONFIG_IOMMU_API
161 * struct iommu_ops - iommu ops and capabilities
162 * @capable: check capability
163 * @domain_alloc: allocate iommu domain
164 * @domain_free: free iommu domain
165 * @attach_dev: attach device to an iommu domain
166 * @detach_dev: detach device from an iommu domain
167 * @map: map a physically contiguous memory region to an iommu domain
168 * @unmap: unmap a physically contiguous memory region from an iommu domain
169 * @map_sg: map a scatter-gather list of physically contiguous memory chunks
171 * @iova_to_phys: translate iova to physical address
172 * @add_device: add device to iommu grouping
173 * @remove_device: remove device from iommu grouping
174 * @device_group: find iommu group for a particular device
175 * @domain_get_attr: Query domain attributes
176 * @domain_set_attr: Change domain attributes
177 * @get_resv_regions: Request list of reserved regions for a device
178 * @put_resv_regions: Free list of reserved regions for a device
179 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
180 * @domain_window_enable: Configure and enable a particular window for a domain
181 * @domain_window_disable: Disable a particular window for a domain
182 * @domain_set_windows: Set the number of windows for a domain
183 * @domain_get_windows: Return the number of windows for a domain
184 * @of_xlate: add OF master IDs to iommu grouping
185 * @pgsize_bitmap: bitmap of all possible supported page sizes
188 bool (*capable)(enum iommu_cap);
190 /* Domain allocation and freeing by the iommu driver */
191 struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
192 void (*domain_free)(struct iommu_domain *);
194 int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
195 void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
196 int (*map)(struct iommu_domain *domain, unsigned long iova,
197 phys_addr_t paddr, size_t size, int prot);
198 size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
200 size_t (*map_sg)(struct iommu_domain *domain, unsigned long iova,
201 struct scatterlist *sg, unsigned int nents, int prot);
202 phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
203 int (*add_device)(struct device *dev);
204 void (*remove_device)(struct device *dev);
205 struct iommu_group *(*device_group)(struct device *dev);
206 int (*domain_get_attr)(struct iommu_domain *domain,
207 enum iommu_attr attr, void *data);
208 int (*domain_set_attr)(struct iommu_domain *domain,
209 enum iommu_attr attr, void *data);
211 /* Request/Free a list of reserved regions for a device */
212 void (*get_resv_regions)(struct device *dev, struct list_head *list);
213 void (*put_resv_regions)(struct device *dev, struct list_head *list);
214 void (*apply_resv_region)(struct device *dev,
215 struct iommu_domain *domain,
216 struct iommu_resv_region *region);
218 /* Window handling functions */
219 int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
220 phys_addr_t paddr, u64 size, int prot);
221 void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
222 /* Set the number of windows per domain */
223 int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
224 /* Get the number of windows per domain */
225 u32 (*domain_get_windows)(struct iommu_domain *domain);
227 int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
229 unsigned long pgsize_bitmap;
233 * struct iommu_device - IOMMU core representation of one IOMMU hardware
235 * @list: Used by the iommu-core to keep a list of registered iommus
236 * @ops: iommu-ops for talking to this iommu
237 * @dev: struct device for sysfs handling
239 struct iommu_device {
240 struct list_head list;
241 const struct iommu_ops *ops;
242 struct fwnode_handle *fwnode;
246 int iommu_device_register(struct iommu_device *iommu);
247 void iommu_device_unregister(struct iommu_device *iommu);
248 int iommu_device_sysfs_add(struct iommu_device *iommu,
249 struct device *parent,
250 const struct attribute_group **groups,
251 const char *fmt, ...) __printf(4, 5);
252 void iommu_device_sysfs_remove(struct iommu_device *iommu);
253 int iommu_device_link(struct iommu_device *iommu, struct device *link);
254 void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
256 static inline void iommu_device_set_ops(struct iommu_device *iommu,
257 const struct iommu_ops *ops)
262 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
263 struct fwnode_handle *fwnode)
265 iommu->fwnode = fwnode;
268 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
270 return (struct iommu_device *)dev_get_drvdata(dev);
273 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
274 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
275 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
276 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
277 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
278 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
280 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
281 extern bool iommu_present(struct bus_type *bus);
282 extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
283 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
284 extern struct iommu_group *iommu_group_get_by_id(int id);
285 extern void iommu_domain_free(struct iommu_domain *domain);
286 extern int iommu_attach_device(struct iommu_domain *domain,
288 extern void iommu_detach_device(struct iommu_domain *domain,
290 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
291 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
292 phys_addr_t paddr, size_t size, int prot);
293 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
295 extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
296 struct scatterlist *sg,unsigned int nents,
298 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
299 extern void iommu_set_fault_handler(struct iommu_domain *domain,
300 iommu_fault_handler_t handler, void *token);
302 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
303 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
304 extern int iommu_request_dm_for_dev(struct device *dev);
305 extern struct iommu_resv_region *
306 iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
307 enum iommu_resv_type type);
308 extern int iommu_get_group_resv_regions(struct iommu_group *group,
309 struct list_head *head);
311 extern int iommu_attach_group(struct iommu_domain *domain,
312 struct iommu_group *group);
313 extern void iommu_detach_group(struct iommu_domain *domain,
314 struct iommu_group *group);
315 extern struct iommu_group *iommu_group_alloc(void);
316 extern void *iommu_group_get_iommudata(struct iommu_group *group);
317 extern void iommu_group_set_iommudata(struct iommu_group *group,
319 void (*release)(void *iommu_data));
320 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
321 extern int iommu_group_add_device(struct iommu_group *group,
323 extern void iommu_group_remove_device(struct device *dev);
324 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
325 int (*fn)(struct device *, void *));
326 extern struct iommu_group *iommu_group_get(struct device *dev);
327 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
328 extern void iommu_group_put(struct iommu_group *group);
329 extern int iommu_group_register_notifier(struct iommu_group *group,
330 struct notifier_block *nb);
331 extern int iommu_group_unregister_notifier(struct iommu_group *group,
332 struct notifier_block *nb);
333 extern int iommu_group_id(struct iommu_group *group);
334 extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
335 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
337 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
339 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
342 /* Window handling function prototypes */
343 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
344 phys_addr_t offset, u64 size,
346 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
348 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
349 unsigned long iova, int flags);
351 static inline size_t iommu_map_sg(struct iommu_domain *domain,
352 unsigned long iova, struct scatterlist *sg,
353 unsigned int nents, int prot)
355 return domain->ops->map_sg(domain, iova, sg, nents, prot);
358 /* PCI device grouping function */
359 extern struct iommu_group *pci_device_group(struct device *dev);
360 /* Generic device grouping function */
361 extern struct iommu_group *generic_device_group(struct device *dev);
364 * struct iommu_fwspec - per-device IOMMU instance data
365 * @ops: ops for this device's IOMMU
366 * @iommu_fwnode: firmware handle for this device's IOMMU
367 * @iommu_priv: IOMMU driver private data for this device
368 * @num_ids: number of associated device IDs
369 * @ids: IDs which this device may present to the IOMMU
371 struct iommu_fwspec {
372 const struct iommu_ops *ops;
373 struct fwnode_handle *iommu_fwnode;
375 unsigned int num_ids;
379 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
380 const struct iommu_ops *ops);
381 void iommu_fwspec_free(struct device *dev);
382 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
383 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
385 #else /* CONFIG_IOMMU_API */
388 struct iommu_group {};
389 struct iommu_fwspec {};
390 struct iommu_device {};
392 static inline bool iommu_present(struct bus_type *bus)
397 static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
402 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
407 static inline struct iommu_group *iommu_group_get_by_id(int id)
412 static inline void iommu_domain_free(struct iommu_domain *domain)
416 static inline int iommu_attach_device(struct iommu_domain *domain,
422 static inline void iommu_detach_device(struct iommu_domain *domain,
427 static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
432 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
433 phys_addr_t paddr, int gfp_order, int prot)
438 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
444 static inline size_t iommu_map_sg(struct iommu_domain *domain,
445 unsigned long iova, struct scatterlist *sg,
446 unsigned int nents, int prot)
451 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
452 u32 wnd_nr, phys_addr_t paddr,
458 static inline void iommu_domain_window_disable(struct iommu_domain *domain,
463 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
468 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
469 iommu_fault_handler_t handler, void *token)
473 static inline void iommu_get_resv_regions(struct device *dev,
474 struct list_head *list)
478 static inline void iommu_put_resv_regions(struct device *dev,
479 struct list_head *list)
483 static inline int iommu_get_group_resv_regions(struct iommu_group *group,
484 struct list_head *head)
489 static inline int iommu_request_dm_for_dev(struct device *dev)
494 static inline int iommu_attach_group(struct iommu_domain *domain,
495 struct iommu_group *group)
500 static inline void iommu_detach_group(struct iommu_domain *domain,
501 struct iommu_group *group)
505 static inline struct iommu_group *iommu_group_alloc(void)
507 return ERR_PTR(-ENODEV);
510 static inline void *iommu_group_get_iommudata(struct iommu_group *group)
515 static inline void iommu_group_set_iommudata(struct iommu_group *group,
517 void (*release)(void *iommu_data))
521 static inline int iommu_group_set_name(struct iommu_group *group,
527 static inline int iommu_group_add_device(struct iommu_group *group,
533 static inline void iommu_group_remove_device(struct device *dev)
537 static inline int iommu_group_for_each_dev(struct iommu_group *group,
539 int (*fn)(struct device *, void *))
544 static inline struct iommu_group *iommu_group_get(struct device *dev)
549 static inline void iommu_group_put(struct iommu_group *group)
553 static inline int iommu_group_register_notifier(struct iommu_group *group,
554 struct notifier_block *nb)
559 static inline int iommu_group_unregister_notifier(struct iommu_group *group,
560 struct notifier_block *nb)
565 static inline int iommu_group_id(struct iommu_group *group)
570 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
571 enum iommu_attr attr, void *data)
576 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
577 enum iommu_attr attr, void *data)
582 static inline int iommu_device_register(struct iommu_device *iommu)
587 static inline void iommu_device_set_ops(struct iommu_device *iommu,
588 const struct iommu_ops *ops)
592 static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
593 struct fwnode_handle *fwnode)
597 static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
602 static inline void iommu_device_unregister(struct iommu_device *iommu)
606 static inline int iommu_device_sysfs_add(struct iommu_device *iommu,
607 struct device *parent,
608 const struct attribute_group **groups,
609 const char *fmt, ...)
614 static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
618 static inline int iommu_device_link(struct device *dev, struct device *link)
623 static inline void iommu_device_unlink(struct device *dev, struct device *link)
627 static inline int iommu_fwspec_init(struct device *dev,
628 struct fwnode_handle *iommu_fwnode,
629 const struct iommu_ops *ops)
634 static inline void iommu_fwspec_free(struct device *dev)
638 static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
645 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
650 #endif /* CONFIG_IOMMU_API */
652 #endif /* __LINUX_IOMMU_H */