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TOMOYO Linux Cross Reference
Linux/include/xen/grant_table.h

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  1 /******************************************************************************
  2  * grant_table.h
  3  *
  4  * Two sets of functionality:
  5  * 1. Granting foreign access to our memory reservation.
  6  * 2. Accessing others' memory reservations via grant references.
  7  * (i.e., mechanisms for both sender and recipient of grant references)
  8  *
  9  * Copyright (c) 2004-2005, K A Fraser
 10  * Copyright (c) 2005, Christopher Clark
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public License version 2
 14  * as published by the Free Software Foundation; or, when distributed
 15  * separately from the Linux kernel or incorporated into other
 16  * software packages, subject to the following license:
 17  *
 18  * Permission is hereby granted, free of charge, to any person obtaining a copy
 19  * of this source file (the "Software"), to deal in the Software without
 20  * restriction, including without limitation the rights to use, copy, modify,
 21  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 22  * and to permit persons to whom the Software is furnished to do so, subject to
 23  * the following conditions:
 24  *
 25  * The above copyright notice and this permission notice shall be included in
 26  * all copies or substantial portions of the Software.
 27  *
 28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 29  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 30  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 31  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 32  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 33  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 34  * IN THE SOFTWARE.
 35  */
 36 
 37 #ifndef __ASM_GNTTAB_H__
 38 #define __ASM_GNTTAB_H__
 39 
 40 #include <asm/page.h>
 41 
 42 #include <xen/interface/xen.h>
 43 #include <xen/interface/grant_table.h>
 44 
 45 #include <asm/xen/hypervisor.h>
 46 
 47 #include <xen/features.h>
 48 #include <linux/mm_types.h>
 49 #include <linux/page-flags.h>
 50 
 51 #define GNTTAB_RESERVED_XENSTORE 1
 52 
 53 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
 54 #define NR_GRANT_FRAMES 4
 55 
 56 struct gnttab_free_callback {
 57         struct gnttab_free_callback *next;
 58         void (*fn)(void *);
 59         void *arg;
 60         u16 count;
 61 };
 62 
 63 struct gntab_unmap_queue_data;
 64 
 65 typedef void (*gnttab_unmap_refs_done)(int result, struct gntab_unmap_queue_data *data);
 66 
 67 struct gntab_unmap_queue_data
 68 {
 69         struct delayed_work     gnttab_work;
 70         void *data;
 71         gnttab_unmap_refs_done  done;
 72         struct gnttab_unmap_grant_ref *unmap_ops;
 73         struct gnttab_unmap_grant_ref *kunmap_ops;
 74         struct page **pages;
 75         unsigned int count;
 76         unsigned int age;
 77 };
 78 
 79 int gnttab_init(void);
 80 int gnttab_suspend(void);
 81 int gnttab_resume(void);
 82 
 83 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
 84                                 int readonly);
 85 
 86 /*
 87  * End access through the given grant reference, iff the grant entry is no
 88  * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
 89  * use.
 90  */
 91 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
 92 
 93 /*
 94  * Eventually end access through the given grant reference, and once that
 95  * access has been ended, free the given page too.  Access will be ended
 96  * immediately iff the grant entry is not in use, otherwise it will happen
 97  * some time later.  page may be 0, in which case no freeing will occur.
 98  */
 99 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
100                                unsigned long page);
101 
102 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
103 
104 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
105 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
106 
107 int gnttab_query_foreign_access(grant_ref_t ref);
108 
109 /*
110  * operations on reserved batches of grant references
111  */
112 int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
113 
114 void gnttab_free_grant_reference(grant_ref_t ref);
115 
116 void gnttab_free_grant_references(grant_ref_t head);
117 
118 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
119 
120 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
121 
122 void gnttab_release_grant_reference(grant_ref_t *private_head,
123                                     grant_ref_t release);
124 
125 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
126                                   void (*fn)(void *), void *arg, u16 count);
127 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
128 
129 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
130                                      unsigned long frame, int readonly);
131 
132 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
133                                        unsigned long pfn);
134 
135 static inline void
136 gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
137                   uint32_t flags, grant_ref_t ref, domid_t domid)
138 {
139         if (flags & GNTMAP_contains_pte)
140                 map->host_addr = addr;
141         else if (xen_feature(XENFEAT_auto_translated_physmap))
142                 map->host_addr = __pa(addr);
143         else
144                 map->host_addr = addr;
145 
146         map->flags = flags;
147         map->ref = ref;
148         map->dom = domid;
149 }
150 
151 static inline void
152 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
153                     uint32_t flags, grant_handle_t handle)
154 {
155         if (flags & GNTMAP_contains_pte)
156                 unmap->host_addr = addr;
157         else if (xen_feature(XENFEAT_auto_translated_physmap))
158                 unmap->host_addr = __pa(addr);
159         else
160                 unmap->host_addr = addr;
161 
162         unmap->handle = handle;
163         unmap->dev_bus_addr = 0;
164 }
165 
166 int arch_gnttab_init(unsigned long nr_shared);
167 int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes,
168                            unsigned long max_nr_gframes,
169                            void **__shared);
170 void arch_gnttab_unmap(void *shared, unsigned long nr_gframes);
171 
172 struct grant_frames {
173         xen_pfn_t *pfn;
174         unsigned int count;
175         void *vaddr;
176 };
177 extern struct grant_frames xen_auto_xlat_grant_frames;
178 unsigned int gnttab_max_grant_frames(void);
179 int gnttab_setup_auto_xlat_frames(phys_addr_t addr);
180 void gnttab_free_auto_xlat_frames(void);
181 
182 #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
183 
184 int gnttab_alloc_pages(int nr_pages, struct page **pages);
185 void gnttab_free_pages(int nr_pages, struct page **pages);
186 
187 int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
188                     struct gnttab_map_grant_ref *kmap_ops,
189                     struct page **pages, unsigned int count);
190 int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
191                       struct gnttab_unmap_grant_ref *kunmap_ops,
192                       struct page **pages, unsigned int count);
193 void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item);
194 
195 
196 /* Perform a batch of grant map/copy operations. Retry every batch slot
197  * for which the hypervisor returns GNTST_eagain. This is typically due
198  * to paged out target frames.
199  *
200  * Will retry for 1, 2, ... 255 ms, i.e. 256 times during 32 seconds.
201  *
202  * Return value in each iand every status field of the batch guaranteed
203  * to not be GNTST_eagain.
204  */
205 void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count);
206 void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count);
207 
208 
209 struct xen_page_foreign {
210         domid_t domid;
211         grant_ref_t gref;
212 };
213 
214 static inline struct xen_page_foreign *xen_page_foreign(struct page *page)
215 {
216         if (!PageForeign(page))
217                 return NULL;
218 #if BITS_PER_LONG < 64
219         return (struct xen_page_foreign *)page->private;
220 #else
221         BUILD_BUG_ON(sizeof(struct xen_page_foreign) > BITS_PER_LONG);
222         return (struct xen_page_foreign *)&page->private;
223 #endif
224 }
225 
226 #endif /* __ASM_GNTTAB_H__ */
227 

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