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Diffstat (limited to 'usr/src/uts/i86xpv/sys/gnttab.h')
| -rw-r--r-- | usr/src/uts/i86xpv/sys/gnttab.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/usr/src/uts/i86xpv/sys/gnttab.h b/usr/src/uts/i86xpv/sys/gnttab.h new file mode 100644 index 0000000000..7066ae3243 --- /dev/null +++ b/usr/src/uts/i86xpv/sys/gnttab.h @@ -0,0 +1,152 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_GNTTAB_H +#define _SYS_GNTTAB_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +/* + * gnttab.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 file may be 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. + */ + +#include <sys/hypervisor.h> +#include <xen/public/grant_table.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */ +#ifdef __ia64__ +#define NR_GRANT_FRAMES 1 +#else +#define NR_GRANT_FRAMES 4 +#endif + +struct gnttab_free_callback { + struct gnttab_free_callback *next; + void (*fn)(void *); + void *arg; + uint16_t count; +}; + +/* + * For i86xpv the "frames" in grant table terminology are really MFNs. + */ +typedef mfn_t gnttab_frame_t; +#define FRAME_TO_MA(f) ((maddr_t)(f) << PAGESHIFT) + +int gnttab_grant_foreign_access(domid_t, gnttab_frame_t, 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, + gnttab_frame_t page); + +int gnttab_grant_foreign_transfer(domid_t domid); + +gnttab_frame_t gnttab_end_foreign_transfer_ref(grant_ref_t ref); +gnttab_frame_t 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(uint16_t 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_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, uint16_t count); + +void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, + gnttab_frame_t frame, int readonly); + +void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid); + +#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) + +/* + * framework + */ +void gnttab_init(void); +void gnttab_suspend(void); +void gnttab_resume(void); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_GNTTAB_H */ |