[net-next-2.6.git] / include / xen / grant_table.h

/******************************************************************************
 * grant_table.h
 *
 * Two sets of functionality:
 * 1. Granting foreign access to our memory reservation.
 * 2. Accessing others' memory reservations via grant references.
 * (i.e., mechanisms for both sender and recipient of grant references)
 *
 * Copyright (c) 2004-2005, K A Fraser
 * Copyright (c) 2005, Christopher Clark
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef __ASM_GNTTAB_H__
#define __ASM_GNTTAB_H__

#include <asm/xen/hypervisor.h>
#include <xen/interface/grant_table.h>
#include <asm/xen/grant_table.h>

/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
#define NR_GRANT_FRAMES 4

struct gnttab_free_callback {
	struct gnttab_free_callback *next;
	void (*fn)(void *);
	void *arg;
	u16 count;
};

int gnttab_init(void);
int gnttab_suspend(void);
int gnttab_resume(void);

int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
				int readonly);

/*
 * End access through the given grant reference, iff the grant entry is no
 * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
 * use.
 */
int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);

/*
 * Eventually end access through the given grant reference, and once that
 * access has been ended, free the given page too.  Access will be ended
 * immediately iff the grant entry is not in use, otherwise it will happen
 * some time later.  page may be 0, in which case no freeing will occur.
 */
void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
			       unsigned long page);

int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);

unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);

int gnttab_query_foreign_access(grant_ref_t ref);

/*
 * operations on reserved batches of grant references
 */
int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);

void gnttab_free_grant_reference(grant_ref_t ref);

void gnttab_free_grant_references(grant_ref_t head);

int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);

int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);

void gnttab_release_grant_reference(grant_ref_t *private_head,
				    grant_ref_t release);

void gnttab_request_free_callback(struct gnttab_free_callback *callback,
				  void (*fn)(void *), void *arg, u16 count);
void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);

void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
				     unsigned long frame, int readonly);

void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
				       unsigned long pfn);

int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
			   unsigned long max_nr_gframes,
			   struct grant_entry **__shared);
void arch_gnttab_unmap_shared(struct grant_entry *shared,
			      unsigned long nr_gframes);

extern unsigned long xen_hvm_resume_frames;
unsigned int gnttab_max_grant_frames(void);

#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))

#endif /* __ASM_GNTTAB_H__ */
Commit	Line	Data
ad9a8612 JF	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/xen/hypervisor.h>
	41	#include <xen/interface/grant_table.h>
5f0ababb	42	#include <asm/xen/grant_table.h>
ad9a8612 JF	43
	44	/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
	45	#define NR_GRANT_FRAMES 4
	46
	47	struct gnttab_free_callback {
	48	struct gnttab_free_callback *next;
	49	void (fn)(void );
	50	void *arg;
	51	u16 count;
	52	};
	53
183d03cc	54	int gnttab_init(void);
0e91398f JF	55	int gnttab_suspend(void);
	56	int gnttab_resume(void);
	57
ad9a8612 JF	58	int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
	59	int readonly);
	60
	61	/*
	62	* End access through the given grant reference, iff the grant entry is no
	63	* longer in use. Return 1 if the grant entry was freed, 0 if it is still in
	64	* use.
	65	*/
	66	int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly);
	67
	68	/*
	69	* Eventually end access through the given grant reference, and once that
	70	* access has been ended, free the given page too. Access will be ended
	71	* immediately iff the grant entry is not in use, otherwise it will happen
	72	* some time later. page may be 0, in which case no freeing will occur.
	73	*/
	74	void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
	75	unsigned long page);
	76
	77	int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
	78
	79	unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
	80	unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
	81
	82	int gnttab_query_foreign_access(grant_ref_t ref);
	83
	84	/*
	85	* operations on reserved batches of grant references
	86	*/
	87	int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head);
	88
	89	void gnttab_free_grant_reference(grant_ref_t ref);
	90
	91	void gnttab_free_grant_references(grant_ref_t head);
	92
	93	int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
	94
	95	int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
	96
	97	void gnttab_release_grant_reference(grant_ref_t *private_head,
	98	grant_ref_t release);
	99
	100	void gnttab_request_free_callback(struct gnttab_free_callback *callback,
	101	void (fn)(void ), void *arg, u16 count);
	102	void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
	103
	104	void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
	105	unsigned long frame, int readonly);
	106
	107	void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
	108	unsigned long pfn);
	109
8d3d2106 IY	110	int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
	111	unsigned long max_nr_gframes,
	112	struct grant_entry **__shared);
	113	void arch_gnttab_unmap_shared(struct grant_entry *shared,
	114	unsigned long nr_gframes);
	115
183d03cc SS	116	extern unsigned long xen_hvm_resume_frames;
	117	unsigned int gnttab_max_grant_frames(void);
	118
ad9a8612 JF	119	#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
	120
	121	#endif /* __ASM_GNTTAB_H__ */