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/******************************************************************************
* include/asm-x86/mem_event.h
*
* Common interface for memory event support.
*
* Copyright (c) 2009 Citrix Systems, Inc. (Patrick Colp)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __MEM_EVENT_H__
#define __MEM_EVENT_H__
/* Returns whether a ring has been set up */
bool_t mem_event_check_ring(struct mem_event_domain *med);
/* Returns 0 on success, -ENOSYS if there is no ring, -EBUSY if there is no
* available space and the caller is a foreign domain. If the guest itself
* is the caller, -EBUSY is avoided by sleeping on a wait queue to ensure
* that the ring does not lose future events.
*
* However, the allow_sleep flag can be set to false in cases in which it is ok
* to lose future events, and thus -EBUSY can be returned to guest vcpus
* (handle with care!).
*
* In general, you must follow a claim_slot() call with either put_request() or
* cancel_slot(), both of which are guaranteed to
* succeed.
*/
int __mem_event_claim_slot(struct domain *d, struct mem_event_domain *med,
bool_t allow_sleep);
static inline int mem_event_claim_slot(struct domain *d,
struct mem_event_domain *med)
{
return __mem_event_claim_slot(d, med, 1);
}
static inline int mem_event_claim_slot_nosleep(struct domain *d,
struct mem_event_domain *med)
{
return __mem_event_claim_slot(d, med, 0);
}
void mem_event_cancel_slot(struct domain *d, struct mem_event_domain *med);
void mem_event_put_request(struct domain *d, struct mem_event_domain *med,
mem_event_request_t *req);
int mem_event_get_response(struct domain *d, struct mem_event_domain *med,
mem_event_response_t *rsp);
int do_mem_event_op(int op, uint32_t domain, void *arg);
int mem_event_domctl(struct domain *d, xen_domctl_mem_event_op_t *mec,
XEN_GUEST_HANDLE_PARAM(void) u_domctl);
#endif /* __MEM_EVENT_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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