/root/src/xen/xen/include/public/sched.h

Source (jump to first uncovered line)
/******************************************************************************
 * sched.h
 *
 * Scheduler state interactions
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (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.
 *
 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
 */

#ifndef __XEN_PUBLIC_SCHED_H__
#define __XEN_PUBLIC_SCHED_H__

#include "event_channel.h"

/*
 * `incontents 150 sched Guest Scheduler Operations
 *
 * The SCHEDOP interface provides mechanisms for a guest to interact
 * with the scheduler, including yield, blocking and shutting itself
 * down.
 */

/*
 * The prototype for this hypercall is:
 * ` long HYPERVISOR_sched_op(enum sched_op cmd, void *arg, ...)
 *
 * @cmd == SCHEDOP_??? (scheduler operation).
 * @arg == Operation-specific extra argument(s), as described below.
 * ...  == Additional Operation-specific extra arguments, described below.
 *
 * Versions of Xen prior to 3.0.2 provided only the following legacy version
 * of this hypercall, supporting only the commands yield, block and shutdown:
 *  long sched_op(int cmd, unsigned long arg)
 * @cmd == SCHEDOP_??? (scheduler operation).
 * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
 *      == SHUTDOWN_* code (SCHEDOP_shutdown)
 *
 * This legacy version is available to new guests as:
 * ` long HYPERVISOR_sched_op_compat(enum sched_op cmd, unsigned long arg)
 */

/* ` enum sched_op { // SCHEDOP_* => struct sched_* */
/*
 * Voluntarily yield the CPU.
 * @arg == NULL.
 */
#define SCHEDOP_yield       0

/*
 * Block execution of this VCPU until an event is received for processing.
 * If called with event upcalls masked, this operation will atomically
 * reenable event delivery and check for pending events before blocking the
 * VCPU. This avoids a "wakeup waiting" race.
 * @arg == NULL.
 */
#define SCHEDOP_block       1

/*
 * Halt execution of this domain (all VCPUs) and notify the system controller.
 * @arg == pointer to sched_shutdown_t structure.
 *
 * If the sched_shutdown_t reason is SHUTDOWN_suspend then
 * x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
 * of the guest's start info page.  RDX/EDX is the third hypercall
 * argument.
 *
 * In addition, which reason is SHUTDOWN_suspend this hypercall
 * returns 1 if suspend was cancelled or the domain was merely
 * checkpointed, and 0 if it is resuming in a new domain.
 */
#define SCHEDOP_shutdown    2

/*
 * Poll a set of event-channel ports. Return when one or more are pending. An
 * optional timeout may be specified.
 * @arg == pointer to sched_poll_t structure.
 */
#define SCHEDOP_poll        3

/*
 * Declare a shutdown for another domain. The main use of this function is
 * in interpreting shutdown requests and reasons for fully-virtualized
 * domains.  A para-virtualized domain may use SCHEDOP_shutdown directly.
 * @arg == pointer to sched_remote_shutdown_t structure.
 */
#define SCHEDOP_remote_shutdown        4

/*
 * Latch a shutdown code, so that when the domain later shuts down it
 * reports this code to the control tools.
 * @arg == sched_shutdown_t, as for SCHEDOP_shutdown.
 */
#define SCHEDOP_shutdown_code 5

/*
 * Setup, poke and destroy a domain watchdog timer.
 * @arg == pointer to sched_watchdog_t structure.
 * With id == 0, setup a domain watchdog timer to cause domain shutdown
 *               after timeout, returns watchdog id.
 * With id != 0 and timeout == 0, destroy domain watchdog timer.
 * With id != 0 and timeout != 0, poke watchdog timer and set new timeout.
 */
#define SCHEDOP_watchdog    6

/*
 * Override the current vcpu affinity by pinning it to one physical cpu or
 * undo this override restoring the previous affinity.
 * @arg == pointer to sched_pin_override_t structure.
 *
 * A negative pcpu value will undo a previous pin override and restore the
 * previous cpu affinity.
 * This call is allowed for the hardware domain only and requires the cpu
 * to be part of the domain's cpupool.
 */
#define SCHEDOP_pin_override 7
/* ` } */

struct sched_shutdown {
    unsigned int reason; /* SHUTDOWN_* => enum sched_shutdown_reason */
};
typedef struct sched_shutdown sched_shutdown_t;
DEFINE_XEN_GUEST_HANDLE(sched_shutdown_t);

struct sched_poll {
    XEN_GUEST_HANDLE(evtchn_port_t) ports;
    unsigned int nr_ports;
    uint64_t timeout;
};
typedef struct sched_poll sched_poll_t;
DEFINE_XEN_GUEST_HANDLE(sched_poll_t);

struct sched_remote_shutdown {
    domid_t domain_id;         /* Remote domain ID */
    unsigned int reason;       /* SHUTDOWN_* => enum sched_shutdown_reason */
};
typedef struct sched_remote_shutdown sched_remote_shutdown_t;
DEFINE_XEN_GUEST_HANDLE(sched_remote_shutdown_t);

struct sched_watchdog {
    uint32_t id;                /* watchdog ID */
    uint32_t timeout;           /* timeout */
};
typedef struct sched_watchdog sched_watchdog_t;
DEFINE_XEN_GUEST_HANDLE(sched_watchdog_t);

struct sched_pin_override {
    int32_t pcpu;
};
typedef struct sched_pin_override sched_pin_override_t;
DEFINE_XEN_GUEST_HANDLE(sched_pin_override_t);

/*
 * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
 * software to determine the appropriate action. For the most part, Xen does
 * not care about the shutdown code.
 */
/* ` enum sched_shutdown_reason { */
#define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
#define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
#define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
#define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
#define SHUTDOWN_watchdog   4  /* Restart because watchdog time expired.     */

/*
 * Domain asked to perform 'soft reset' for it. The expected behavior is to
 * reset internal Xen state for the domain returning it to the point where it
 * was created but leaving the domain's memory contents and vCPU contexts
 * intact. This will allow the domain to start over and set up all Xen specific
 * interfaces again.
 */
#define SHUTDOWN_soft_reset 5
#define SHUTDOWN_MAX        5  /* Maximum valid shutdown reason.             */
/* ` } */

#endif /* __XEN_PUBLIC_SCHED_H__ */

/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */

Coverage Report

Created: 2017-10-25 09:10

Line	Count	Source (jump to first uncovered line)
1		/******************************************************************************
2		* sched.h
3		*
4		* Scheduler state interactions
5		*
6		* Permission is hereby granted, free of charge, to any person obtaining a copy
7		* of this software and associated documentation files (the "Software"), to
8		* deal in the Software without restriction, including without limitation the
9		* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10		* sell copies of the Software, and to permit persons to whom the Software is
11		* furnished to do so, subject to the following conditions:
12		*
13		* The above copyright notice and this permission notice shall be included in
14		* all copies or substantial portions of the Software.
15		*
16		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19		* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20		* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21		* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22		* DEALINGS IN THE SOFTWARE.
23		*
24		* Copyright (c) 2005, Keir Fraser <keir@xensource.com>
25		*/
26
27		#ifndef __XEN_PUBLIC_SCHED_H__
28		#define __XEN_PUBLIC_SCHED_H__
29
30		#include "event_channel.h"
31
32		/*
33		* `incontents 150 sched Guest Scheduler Operations
34		*
35		* The SCHEDOP interface provides mechanisms for a guest to interact
36		* with the scheduler, including yield, blocking and shutting itself
37		* down.
38		*/
39
40		/*
41		* The prototype for this hypercall is:
42		* ` long HYPERVISOR_sched_op(enum sched_op cmd, void *arg, ...)
43		*
44		* @cmd == SCHEDOP_??? (scheduler operation).
45		* @arg == Operation-specific extra argument(s), as described below.
46		* ... == Additional Operation-specific extra arguments, described below.
47		*
48		* Versions of Xen prior to 3.0.2 provided only the following legacy version
49		* of this hypercall, supporting only the commands yield, block and shutdown:
50		* long sched_op(int cmd, unsigned long arg)
51		* @cmd == SCHEDOP_??? (scheduler operation).
52		* @arg == 0 (SCHEDOP_yield and SCHEDOP_block)
53		* == SHUTDOWN_* code (SCHEDOP_shutdown)
54		*
55		* This legacy version is available to new guests as:
56		* ` long HYPERVISOR_sched_op_compat(enum sched_op cmd, unsigned long arg)
57		*/
58
59		/* ` enum sched_op { // SCHEDOP_* => struct sched_* */
60		/*
61		* Voluntarily yield the CPU.
62		* @arg == NULL.
63		*/
64	9.05M	#define SCHEDOP_yield 0
65
66		/*
67		* Block execution of this VCPU until an event is received for processing.
68		* If called with event upcalls masked, this operation will atomically
69		* reenable event delivery and check for pending events before blocking the
70		* VCPU. This avoids a "wakeup waiting" race.
71		* @arg == NULL.
72		*/
73	131k	#define SCHEDOP_block 1
74
75		/*
76		* Halt execution of this domain (all VCPUs) and notify the system controller.
77		* @arg == pointer to sched_shutdown_t structure.
78		*
79		* If the sched_shutdown_t reason is SHUTDOWN_suspend then
80		* x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
81		* of the guest's start info page. RDX/EDX is the third hypercall
82		* argument.
83		*
84		* In addition, which reason is SHUTDOWN_suspend this hypercall
85		* returns 1 if suspend was cancelled or the domain was merely
86		* checkpointed, and 0 if it is resuming in a new domain.
87		*/
88	0	#define SCHEDOP_shutdown 2
89
90		/*
91		* Poll a set of event-channel ports. Return when one or more are pending. An
92		* optional timeout may be specified.
93		* @arg == pointer to sched_poll_t structure.
94		*/
95	0	#define SCHEDOP_poll 3
96
97		/*
98		* Declare a shutdown for another domain. The main use of this function is
99		* in interpreting shutdown requests and reasons for fully-virtualized
100		* domains. A para-virtualized domain may use SCHEDOP_shutdown directly.
101		* @arg == pointer to sched_remote_shutdown_t structure.
102		*/
103	0	#define SCHEDOP_remote_shutdown 4
104
105		/*
106		* Latch a shutdown code, so that when the domain later shuts down it
107		* reports this code to the control tools.
108		* @arg == sched_shutdown_t, as for SCHEDOP_shutdown.
109		*/
110	0	#define SCHEDOP_shutdown_code 5
111
112		/*
113		* Setup, poke and destroy a domain watchdog timer.
114		* @arg == pointer to sched_watchdog_t structure.
115		* With id == 0, setup a domain watchdog timer to cause domain shutdown
116		* after timeout, returns watchdog id.
117		* With id != 0 and timeout == 0, destroy domain watchdog timer.
118		* With id != 0 and timeout != 0, poke watchdog timer and set new timeout.
119		*/
120	0	#define SCHEDOP_watchdog 6
121
122		/*
123		* Override the current vcpu affinity by pinning it to one physical cpu or
124		* undo this override restoring the previous affinity.
125		* @arg == pointer to sched_pin_override_t structure.
126		*
127		* A negative pcpu value will undo a previous pin override and restore the
128		* previous cpu affinity.
129		* This call is allowed for the hardware domain only and requires the cpu
130		* to be part of the domain's cpupool.
131		*/
132	0	#define SCHEDOP_pin_override 7
133		/* ` } */
134
135		struct sched_shutdown {
136		unsigned int reason; /* SHUTDOWN_* => enum sched_shutdown_reason */
137		};
138		typedef struct sched_shutdown sched_shutdown_t;
139		DEFINE_XEN_GUEST_HANDLE(sched_shutdown_t);
140
141		struct sched_poll {
142		XEN_GUEST_HANDLE(evtchn_port_t) ports;
143		unsigned int nr_ports;
144		uint64_t timeout;
145		};
146		typedef struct sched_poll sched_poll_t;
147		DEFINE_XEN_GUEST_HANDLE(sched_poll_t);
148
149		struct sched_remote_shutdown {
150		domid_t domain_id; /* Remote domain ID */
151		unsigned int reason; /* SHUTDOWN_* => enum sched_shutdown_reason */
152		};
153		typedef struct sched_remote_shutdown sched_remote_shutdown_t;
154		DEFINE_XEN_GUEST_HANDLE(sched_remote_shutdown_t);
155
156		struct sched_watchdog {
157		uint32_t id; /* watchdog ID */
158		uint32_t timeout; /* timeout */
159		};
160		typedef struct sched_watchdog sched_watchdog_t;
161		DEFINE_XEN_GUEST_HANDLE(sched_watchdog_t);
162
163		struct sched_pin_override {
164		int32_t pcpu;
165		};
166		typedef struct sched_pin_override sched_pin_override_t;
167		DEFINE_XEN_GUEST_HANDLE(sched_pin_override_t);
168
169		/*
170		* Reason codes for SCHEDOP_shutdown. These may be interpreted by control
171		* software to determine the appropriate action. For the most part, Xen does
172		* not care about the shutdown code.
173		*/
174		/* ` enum sched_shutdown_reason { */
175	0	#define SHUTDOWN_poweroff 0 /* Domain exited normally. Clean up and kill. */
176	1	#define SHUTDOWN_reboot 1 /* Clean up, kill, and then restart. */
177	0	#define SHUTDOWN_suspend 2 /* Clean up, save suspend info, kill. */
178	0	#define SHUTDOWN_crash 3 /* Tell controller we've crashed. */
179	0	#define SHUTDOWN_watchdog 4 /* Restart because watchdog time expired. */
180
181		/*
182		* Domain asked to perform 'soft reset' for it. The expected behavior is to
183		* reset internal Xen state for the domain returning it to the point where it
184		* was created but leaving the domain's memory contents and vCPU contexts
185		* intact. This will allow the domain to start over and set up all Xen specific
186		* interfaces again.
187		*/
188	0	#define SHUTDOWN_soft_reset 5
189	0	#define SHUTDOWN_MAX 5 /* Maximum valid shutdown reason. */
190		/* ` } */
191
192		#endif /* __XEN_PUBLIC_SCHED_H__ */
193
194		/*
195		* Local variables:
196		* mode: C
197		* c-file-style: "BSD"
198		* c-basic-offset: 4
199		* tab-width: 4
200		* indent-tabs-mode: nil
201		* End:
202		*/