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5f0ababbf4
Don't use alloc_vm_area()/free_vm_area() directly, instead define xen_alloc_vm_area()/xen_free_vm_area() and use them. alloc_vm_area()/free_vm_area() are used to allocate/free area which are for grant table mapping. Xen/x86 grant table is based on virtual address so that alloc_vm_area()/free_vm_area() are suitable. On the other hand Xen/ia64 (and Xen/powerpc) grant table is based on pseudo physical address (guest physical address) so that allocation should be done differently. The original version of xenified Linux/IA64 have its own allocate_vm_area()/free_vm_area() definitions which don't allocate vm area contradictory to those names. Now vanilla Linux already has its definitions so that it's impossible to have IA64 definitions of allocate_vm_area()/free_vm_area(). Instead introduce xen_allocate_vm_area()/xen_free_vm_area() and use them. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
108 lines
4 KiB
C
108 lines
4 KiB
C
/******************************************************************************
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* grant_table.h
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*
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* Two sets of functionality:
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* 1. Granting foreign access to our memory reservation.
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* 2. Accessing others' memory reservations via grant references.
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* (i.e., mechanisms for both sender and recipient of grant references)
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*
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* Copyright (c) 2004-2005, K A Fraser
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* Copyright (c) 2005, Christopher Clark
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __ASM_GNTTAB_H__
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#define __ASM_GNTTAB_H__
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#include <asm/xen/hypervisor.h>
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#include <xen/interface/grant_table.h>
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#include <asm/xen/grant_table.h>
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/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
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#define NR_GRANT_FRAMES 4
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struct gnttab_free_callback {
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struct gnttab_free_callback *next;
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void (*fn)(void *);
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void *arg;
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u16 count;
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};
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int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
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int readonly);
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/*
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* End access through the given grant reference, iff the grant entry is no
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* longer in use. Return 1 if the grant entry was freed, 0 if it is still in
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* use.
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*/
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int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
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/*
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* Eventually end access through the given grant reference, and once that
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* access has been ended, free the given page too. Access will be ended
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* immediately iff the grant entry is not in use, otherwise it will happen
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* some time later. page may be 0, in which case no freeing will occur.
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*/
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void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
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unsigned long page);
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int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
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unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
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unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
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int gnttab_query_foreign_access(grant_ref_t ref);
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/*
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* operations on reserved batches of grant references
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*/
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int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
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void gnttab_free_grant_reference(grant_ref_t ref);
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void gnttab_free_grant_references(grant_ref_t head);
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int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
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int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
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void gnttab_release_grant_reference(grant_ref_t *private_head,
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grant_ref_t release);
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void gnttab_request_free_callback(struct gnttab_free_callback *callback,
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void (*fn)(void *), void *arg, u16 count);
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void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
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void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
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unsigned long frame, int readonly);
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void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
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unsigned long pfn);
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#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
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#endif /* __ASM_GNTTAB_H__ */
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