The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/gnttab.h

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    1 /******************************************************************************
    2  * gnttab.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 
   39 #include <xen/interface/grant_table.h>
   40 
   41 #include <xen/hypervisor.h>
   42 #include <xen/interface/grant_table.h>
   43 #include <machine/xen/xen-os.h>
   44 #include <xen/features.h>
   45 
   46 #define GNTTAB_LIST_END GRANT_REF_INVALID
   47 
   48 struct gnttab_free_callback {
   49         struct gnttab_free_callback *next;
   50         void (*fn)(void *);
   51         void *arg;
   52         uint16_t count;
   53 };
   54 
   55 int gnttab_init(void);
   56 
   57 /*
   58  * Allocate a grant table reference and return it in *result. Returns
   59  * zero on success or errno on error.
   60  */
   61 int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
   62     int flags, grant_ref_t *result);
   63 
   64 /*
   65  * End access through the given grant reference, iff the grant entry is no
   66  * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
   67  * use.
   68  */
   69 int gnttab_end_foreign_access_ref(grant_ref_t ref);
   70 
   71 /*
   72  * Eventually end access through the given grant reference, and once that
   73  * access has been ended, free the given page too.  Access will be ended
   74  * immediately iff the grant entry is not in use, otherwise it will happen
   75  * some time later.  page may be 0, in which case no freeing will occur.
   76  */
   77 void gnttab_end_foreign_access(grant_ref_t ref, void *page);
   78 
   79 /*
   80  * Eventually end access through the given array of grant references.
   81  * Access will be ended immediately iff the grant entry is not in use,
   82  * otherwise it will happen some time later
   83  */
   84 void gnttab_end_foreign_access_references(u_int count, grant_ref_t *refs);
   85 
   86 int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn, grant_ref_t *result);
   87 
   88 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
   89 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
   90 
   91 int gnttab_query_foreign_access(grant_ref_t ref);
   92 
   93 /*
   94  * operations on reserved batches of grant references
   95  */
   96 int gnttab_alloc_grant_references(uint16_t count, grant_ref_t *pprivate_head);
   97 
   98 void gnttab_free_grant_reference(grant_ref_t ref);
   99 
  100 void gnttab_free_grant_references(grant_ref_t head);
  101 
  102 int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
  103 
  104 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
  105 
  106 void gnttab_release_grant_reference(grant_ref_t *private_head,
  107                                     grant_ref_t release);
  108 
  109 void gnttab_request_free_callback(struct gnttab_free_callback *callback,
  110                                   void (*fn)(void *), void *arg, uint16_t count);
  111 void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
  112 
  113 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
  114                                      unsigned long frame, int flags);
  115 
  116 void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
  117                                        unsigned long pfn);
  118 
  119 int gnttab_suspend(void);
  120 int gnttab_resume(void);
  121 
  122 #if 0
  123 
  124 #include <xen/features.h>
  125 
  126 static inline void
  127 gnttab_set_map_op(struct gnttab_map_grant_ref *map, vm_paddr_t addr,
  128                   uint32_t flags, grant_ref_t ref, domid_t domid)
  129 {
  130         if (flags & GNTMAP_contains_pte)
  131                 map->host_addr = addr;
  132         else if (xen_feature(XENFEAT_auto_translated_physmap))
  133                 map->host_addr = vtophys(addr);
  134         else
  135                 map->host_addr = addr;
  136 
  137         map->flags = flags;
  138         map->ref = ref;
  139         map->dom = domid;
  140 }
  141 
  142 static inline void
  143 gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, vm_paddr_t addr,
  144                     uint32_t flags, grant_handle_t handle)
  145 {
  146         if (flags & GNTMAP_contains_pte)
  147                 unmap->host_addr = addr;
  148         else if (xen_feature(XENFEAT_auto_translated_physmap))
  149                 unmap->host_addr = vtophys(addr);
  150         else
  151                 unmap->host_addr = addr;
  152 
  153         unmap->handle = handle;
  154         unmap->dev_bus_addr = 0;
  155 }
  156 
  157 static inline void
  158 gnttab_set_replace_op(struct gnttab_unmap_and_replace *unmap, vm_paddr_t addr,
  159                       vm_paddr_t new_addr, grant_handle_t handle)
  160 {
  161         if (xen_feature(XENFEAT_auto_translated_physmap)) {
  162                 unmap->host_addr = vtophys(addr);
  163                 unmap->new_addr = vtophys(new_addr);
  164         } else {
  165                 unmap->host_addr = addr;
  166                 unmap->new_addr = new_addr;
  167         }
  168 
  169         unmap->handle = handle;
  170 }
  171 #endif
  172 
  173 #endif /* __ASM_GNTTAB_H__ */

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