This patch adds an ARINC 653 scheduler to Xen. This is
a modification of an earlier patch (submitted Friday, April 16). In particular,
it has been modified to use the new .adjust_global callback function (added by
Keir Fraser in c/s 21282) and to support CPU pools (per feedback received from
George Dunlap on Tuesday, May 4).
Thanks and regards,
Kathy Hadley
DornerWorks, Ltd.
diff -rupN
a/tools/libxc/Makefile b/tools/libxc/Makefile
---
a/tools/libxc/Makefile 2010-05-26 17:01:34.000000000 -0400
+++
b/tools/libxc/Makefile 2010-06-01 12:30:45.000000000 -0400
@@ -19,6 +19,7 @@
CTRL_SRCS-y += xc_private.c
CTRL_SRCS-y
+= xc_sedf.c
CTRL_SRCS-y
+= xc_csched.c
CTRL_SRCS-y
+= xc_csched2.c
+CTRL_SRCS-y
+= xc_arinc653.c
CTRL_SRCS-y
+= xc_tbuf.c
CTRL_SRCS-y
+= xc_pm.c
CTRL_SRCS-y
+= xc_cpu_hotplug.c
diff -rupN
a/tools/libxc/xc_arinc653.c b/tools/libxc/xc_arinc653.c
---
a/tools/libxc/xc_arinc653.c 1969-12-31 19:00:00.000000000 -0500
+++
b/tools/libxc/xc_arinc653.c 2010-06-14 10:50:57.000000000 -0400
@@ -0,0 +1,27 @@
+/****************************************************************************
+ * (C) 2010 -
DornerWorks, Ltd <DornerWorks.com>
+
****************************************************************************
+ *
+
* File: xc_arinc653.c
+
* Author: Josh Holtrop <DornerWorks.com>
+ *
+ * Description: XC
Interface to the ARINC 653 scheduler
+ *
+ */
+
+#include
"xc_private.h"
+
+int
+xc_sched_arinc653_sched_set(
+
int xc_handle,
+
xen_sysctl_sched_arinc653_schedule_t * sched)
+{
+
DECLARE_SYSCTL;
+
+
sysctl.cmd = XEN_SYSCTL_scheduler_op;
+
sysctl.u.scheduler_op.sched_id = XEN_SCHEDULER_ARINC653;
+
sysctl.u.scheduler_op.cmd = XEN_SYSCTL_SCHEDOP_putinfo;
+
set_xen_guest_handle(sysctl.u.scheduler_op.u.arinc653.schedule, sched);
+
+
return do_sysctl(xc_handle, &sysctl);
+}
diff -rupN
a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
---
a/tools/libxc/xenctrl.h 2010-05-26 17:01:34.000000000
-0400
+++
b/tools/libxc/xenctrl.h 2010-06-01 12:30:45.000000000
-0400
@@ -485,6 +485,16 @@
int xc_sched_credit2_domain_get(int xc_h
struct
xen_domctl_sched_credit2 *sdom);
/**
+ * This function
sets the global ARINC 653 schedule.
+ *
+ * @parm xc_handle
a handle to an open hypervisor interface
+ * @parm sched a
pointer to the new ARINC 653 schedule
+ * return 0 on
success
+ */
+int
xc_sched_arinc653_sched_set(int xc_handle,
+
xen_sysctl_sched_arinc653_schedule_t * sched);
+
+/**
* This
function sends a trigger to a domain.
*
* @parm
xc_handle a handle to an open hypervisor interface
diff -rupN
a/xen/common/Makefile b/xen/common/Makefile
---
a/xen/common/Makefile 2010-05-26 17:01:34.000000000 -0400
+++
b/xen/common/Makefile 2010-06-01 12:30:45.000000000 -0400
@@ -17,6 +17,7 @@
obj-y += rangeset.o
obj-y +=
sched_credit.o
obj-y +=
sched_credit2.o
obj-y +=
sched_sedf.o
+obj-y +=
sched_arinc653.o
obj-y +=
schedule.o
obj-y +=
shutdown.o
obj-y +=
softirq.o
diff -rupN
a/xen/common/sched_arinc653.c b/xen/common/sched_arinc653.c
---
a/xen/common/sched_arinc653.c 1969-12-31 19:00:00.000000000
-0500
+++
b/xen/common/sched_arinc653.c 2010-06-16 09:05:24.000000000
-0400
@@ -0,0 +1,806 @@
+/*
+ * File:
sched_arinc653.c
+ * Copyright (c)
2010, DornerWorks, Ltd. <DornerWorks.com>
+ *
+ * Description:
+ * This
file provides an ARINC 653-compatible scheduling algorithm
+ * for
use in Xen.
+ *
+ * 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.
+ */
+
+
+/**************************************************************************
+ *
Includes
*
+
*************************************************************************/
+#include
<xen/lib.h>
+#include
<xen/sched.h>
+#include
<xen/sched-if.h>
+#include
<xen/timer.h>
+#include
<xen/softirq.h>
+#include
<xen/time.h>
+#include
<xen/errno.h>
+#include
<xen/list.h>
+#include
<public/sysctl.h>
/* ARINC653_MAX_DOMAINS_PER_SCHEDULE */
+#include
<xen/guest_access.h>
+
+
+/**************************************************************************
+ * Private
Macros
*
+
**************************************************************************/
+
+/**
+ * Retrieve the
idle VCPU for a given physical CPU
+ */
+#define
IDLETASK(cpu) (idle_vcpu[cpu])
+
+/**
+ * Return a pointer
to the ARINC 653-specific scheduler data information
+ * associated with
the given VCPU (vc)
+ */
+#define AVCPU(vc)
((arinc653_vcpu_t *)(vc)->sched_priv)
+
+
+/**************************************************************************
+ * Private Type
Definitions
*
+
**************************************************************************/
+
+/**
+ * The
sched_entry_t structure holds a single entry of the
+ * ARINC 653
schedule.
+ */
+typedef struct
sched_entry_s
+{
+
/* dom_handle holds the handle ("UUID") for the domain that this
+
* schedule entry refers to. */
+
xen_domain_handle_t dom_handle;
+
/* vcpu_id holds the VCPU number for the VCPU that this schedule
+
* entry refers to. */
+
int
vcpu_id;
+
/* runtime holds the number of nanoseconds that the VCPU for this
+
* schedule entry should be allowed to run per major frame. */
+
s_time_t
runtime;
+
/* vc holds a pointer to the Xen VCPU structure */
+
struct vcpu * vc;
+} sched_entry_t;
+
+/**
+ * The
arinc653_vcpu_t structure holds ARINC 653-scheduler-specific
+ * information for
all non-idle VCPUs
+ */
+typedef struct
arinc653_vcpu_s
+{
+
/* vc points to Xen's struct vcpu so we can get to it from an
+
* arinc653_vcpu_t pointer. */
+
struct vcpu * vc;
+
/* awake holds whether the VCPU has been woken with vcpu_wake() */
+
bool_t
awake;
+
/* list holds the linked list information for the list this VCPU
+
* is stored in */
+
struct list_head list;
+} arinc653_vcpu_t;
+
+/**
+ * Data structure
containing domain-specific information.
+ */
+struct
arinc653_dom_info {
+
struct domain *domain;
+};
+
+/**
+ * Data structure
containing all the "global" data items used by the scheduler.
+ */
+typedef struct
arinc653_sched_private_s
+{
+
/*
+
* This array holds the active ARINC 653 schedule.
+
*
+
* When the system tries to start a new VCPU, this schedule is scanned
+
* to look for a matching (handle, VCPU #) pair. If both the handle
("UUID")
+
* and VCPU number match, then the VCPU is allowed to run. Its run time
+
* (per major frame) is given in the third entry of the schedule.
+
*/
+
sched_entry_t arinc653_schedule[ARINC653_MAX_DOMAINS_PER_SCHEDULE];
+
/*
+
* This variable holds the number of entries that are valid in
+
* the arinc653_schedule table.
+
*
+
* This is not necessarily the same as the number of domains in the
+
* schedule. A domain could be listed multiple times within the schedule,
+
* or a domain with multiple VCPUs could have a different
+
* schedule entry for each VCPU.
+
*
+
* A value of 1 means that only 1 domain (Dom0) will initially be started.
+
*/
+
int num_schedule_entries;
+
/*
+
* arinc653_major_frame holds the major frame time for the ARINC 653
+
* schedule.
+
*/
+ s_time_t
arinc653_major_frame;
+
/*
+
* next_major_frame holds the time that the next major frame starts
+
*/
+
s_time_t next_major_frame;
+
/*
+
* vcpu_list holds pointers to all Xen VCPU structures for iterating through
+
*/
+
struct list_head vcpu_list;
+}
arinc653_sched_private_t;
+
+
+/**************************************************************************
+ * Global
data
*
+
**************************************************************************/
+static
arinc653_sched_private_t arinc653_schedule;
+
+
+/**************************************************************************
+ * Scheduler
functions
*
+ **************************************************************************/
+
+/**
+ * This function
compares two domain handles.
+ *
+ * @param
h1 Pointer to handle 1
+ * @param
h2 Pointer to handle 2
+ *
+ *
@return <ul>
+
* <li>
<0: handle 1 is less than handle 2
+
*
<li> 0: handle 1 is equal to handle 2
+
*
<li> >0: handle 1 is greater than handle 2
+
*
</ul>
+ */
+static int
dom_handle_cmp(const xen_domain_handle_t h1,
+
const xen_domain_handle_t h2)
+{
+
return memcmp(h1, h2, sizeof(xen_domain_handle_t));
+} /* end
dom_handle_cmp */
+
+/**
+ * This function
searches the vcpu list to find a VCPU that matches
+ * the domain
handle and VCPU ID specified.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
handle Pointer to handle
+ * @param
vcpu_id VCPU ID
+ *
+ *
@return <ul>
+
*
<li> Pointer to the matching VCPU if one is found
+
*
<li> NULL otherwise
+
*
</ul>
+ */
+static struct vcpu
* find_vcpu(const struct scheduler *ops,
+
xen_domain_handle_t handle,
+
int vcpu_id)
+{
+
arinc653_sched_private_t *prv = ops->sched_data;
+
arinc653_vcpu_t * avcpu; /* loop index variable */
+
struct vcpu * vc = NULL;
+
+
/* loop through the vcpu_list looking for the specified VCPU */
+
list_for_each_entry(avcpu, &prv->vcpu_list, list)
+
{
+
/* If the handles & VCPU IDs match, we've found a matching VCPU */
+
if ((dom_handle_cmp(avcpu->vc->domain->handle, handle) == 0)
+
&& (vcpu_id == avcpu->vc->vcpu_id))
+
{
+
vc = avcpu->vc;
+
/*
+
* "break" statement used instead of loop control variable because
+
* the macro used for this loop does not support using loop control
+
* variables
+
*/
+
break;
+
}
+
}
+
+
return vc;
+} /* end find_vcpu
*/
+
+/**
+ * This function
updates the pointer to the Xen VCPU structure for each entry in
+ * the ARINC 653
schedule.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ *
+ * @return
<None>
+ */
+static void
update_schedule_vcpus(const struct scheduler *ops)
+{
+
arinc653_sched_private_t *prv = ops->sched_data;
+
+
/* Loop through the number of entries in the schedule */
+
for (int i = 0; i < prv->num_schedule_entries; i++)
+
{
+
/* Update the pointer to the Xen VCPU structure for the current entry */
+
prv->arinc653_schedule[i].vc =
+
find_vcpu(ops,
+
prv->arinc653_schedule[i].dom_handle,
+
prv->arinc653_schedule[i].vcpu_id);
+
}
+} /* end
update_schedule_vcpus */
+
+/**
+ * This function is
called by the arinc653_adjust_global scheduler
+ * callback
function in response to a domain control hypercall with
+ * a scheduler
operation.
+ *
+ * The parameter
schedule is set to be the address of a local variable from
+ * within
arinc653_adjust_global(), so it is guaranteed to not be NULL.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
schedule Pointer to the new ARINC 653 schedule.
+ *
+ *
@return <ul>
+ *
<li> 0 = success
+
*
<li> !0 = error
+
*
</ul>
+ */
+static int
arinc653_sched_set(const struct scheduler *ops,
+
xen_sysctl_sched_arinc653_schedule_t * schedule)
+{
+
arinc653_sched_private_t *prv = ops->sched_data;
+
+
int ret = 0;
+
s_time_t total_runtime = 0;
+
bool_t found_dom0 = 0;
+
const static xen_domain_handle_t dom0_handle = {0};
+
+
/* check for valid major frame and number of schedule entries */
+
if ( (schedule->major_frame <= 0)
+
|| (schedule->num_sched_entries < 1)
+
|| (schedule->num_sched_entries > ARINC653_MAX_DOMAINS_PER_SCHEDULE) )
+
{
+
ret = -EINVAL;
+
}
+
+
if (ret == 0)
+
{
+
for (int i = 0; i < schedule->num_sched_entries; i++)
+
{
+
/*
+
* look for domain 0 handle - every schedule must contain
+
* some time for domain 0 to run
+
*/
+
if (dom_handle_cmp(schedule->sched_entries[i].dom_handle,
+
dom0_handle) == 0)
+
{
+
found_dom0 = 1;
+
}
+
+
/* check for a valid VCPU ID and run time */
+
if ( (schedule->sched_entries[i].vcpu_id < 0)
+
|| (schedule->sched_entries[i].runtime <= 0) )
+
{
+
ret = -EINVAL;
+
}
+
else
+
{
+
/* Add this entry's run time to total run time */
+
total_runtime += schedule->sched_entries[i].runtime;
+
}
+
} /* end loop through schedule entries */
+
}
+
+
if (ret == 0)
+
{
+
/* error if the schedule doesn't contain a slot for domain 0 */
+
if (found_dom0 == 0)
+
{
+ ret
= -EINVAL;
+
}
+
}
+
+
if (ret == 0)
+
{
+
/*
+
* error if the major frame is not large enough to run all entries
+
* as indicated by comparing the total run time to the major frame
+
* length
+
*/
+
if (total_runtime > schedule->major_frame)
+
{
+
ret = -EINVAL;
+
}
+
}
+
+
if (ret == 0)
+
{
+
/* copy the new schedule into place */
+
prv->num_schedule_entries = schedule->num_sched_entries;
+
prv->arinc653_major_frame = schedule->major_frame;
+
for (int i = 0; i < prv->num_schedule_entries; i++)
+
{
+
memcpy(prv->arinc653_schedule[i].dom_handle,
+
schedule->sched_entries[i].dom_handle,
+
sizeof(prv->arinc653_schedule[i].dom_handle));
+
prv->arinc653_schedule[i].vcpu_id =
+
schedule->sched_entries[i].vcpu_id;
+
prv->arinc653_schedule[i].runtime =
+
schedule->sched_entries[i].runtime;
+
}
+
update_schedule_vcpus(ops);
+
+
/*
+
* The newly-installed schedule takes effect immediately.
+
* We do not even wait for the current major frame to expire.
+
*
+
* Signal a new major frame to begin. The next major frame
+
* is set up by the do_schedule callback function when it
+
* is next invoked.
+
*/
+
prv->next_major_frame = NOW();
+
}
+
+
return ret;
+} /* end arinc653_sched_set
*/
+
+/**
+ * Xen scheduler
callback function to adjust global scheduling parameters
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
op Pointer to the system control
scheduler operation structure
+ *
+ *
@return <ul>
+
*
<li> 0 = success
+
*
<li> !0 = error
+
*
</ul>
+ */
+static int
arinc653_adjust_global(const struct scheduler *ops,
+
struct
xen_sysctl_scheduler_op * op)
+{
+
int ret = -1;
+
xen_sysctl_sched_arinc653_schedule_t new_sched;
+
+
if (op->cmd == XEN_SYSCTL_SCHEDOP_putinfo)
+
{
+
if (copy_from_guest(&new_sched, op->u.arinc653.schedule, 1) != 0)
+
{
+
ret = -EFAULT;
+
}
+
else
+
{
+
ret = arinc653_sched_set(ops, &new_sched);
+
}
+
}
+
+
return ret;
+} /* end arinc653_adjust_global
*/
+
+/**
+ * Xen scheduler
callback function to allocate and initialize the ARINC 653
+ * scheduler data
structure.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
pool0 Flag indicating whether pool 0 or other being
allocated
+
*
[Not Used]
+ *
+ *
@return <ul>
+
*
<li> 0 = success
+
*
<li> !0 = error
+
*
</ul>
+ */
+static int
arinc653_init(struct scheduler *ops)
+{
+
arinc653_sched_private_t *prv;
+
int i;
+
+
/* Initial value for the ARINC 653 scheduler data.*/
+
const sched_entry_t init_sched_element = { "", 0, MILLISECS(10), NULL
};
+
+
/* Allocate memory for ARINC 653 scheduler data structure */
+
prv = &arinc653_schedule;
+
if ( prv == NULL )
+
{
+
return -ENOMEM;
+
}
+
+
/* Initialize the ARINC 653 scheduler data structure*/
+
memset(prv, 0, sizeof(*prv));
+
+
/* Set the "scheduler" structure to point to the ARINC 653 scheduler
data */
+
ops->sched_data = prv;
+
+
/*
+
* Initialize the ARINC 653 scheduler data. In particular:
+
* All domains execute for 10 ms.
+
* Only one domain is enabled (domain 0).
+
* Major frame = 10 ms (time required for domain 0).
+
*/
+
for (i=0; i<(sizeof(prv->arinc653_schedule)/sizeof(sched_entry_t)); i++)
+
{
+
prv->arinc653_schedule[i] = init_sched_element;
+
}
+
prv->num_schedule_entries = 1;
+
prv->arinc653_major_frame = MILLISECS(10);
+
prv->next_major_frame = 0;
+
INIT_LIST_HEAD(&prv->vcpu_list);
+
+
return 0;
+} /* end
arinc653_init */
+
+/**
+ * Xen scheduler
callback function to allocate and initialize a data structure
+ * containing
information for a VCPU.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
v Pointer to the VCPU structure
+ * @param
dd Domain data [Not Used]
+ *
+ *
@return <ul>
+
*
<li> address of the allocated data structure
+
*
<li> NULL if error
+
*
</ul>
+ */
+static void
*arinc653_alloc_vdata(const struct scheduler *ops,
+
struct vcpu *v,
+
void *dd)
+{
+
arinc653_sched_private_t *prv = ops->sched_data;
+
arinc653_vcpu_t *inf;
+
+
/*
+
* Allocate memory for the ARINC 653-specific scheduler data information
+
* associated with the given VCPU (vc).
+
*/
+
inf = xmalloc(arinc653_vcpu_t);
+
if (inf != NULL)
+
{
+
/*
+
* Initialize our ARINC 653 scheduler-specific information
+
* for the VCPU.
+
* The VCPU starts "asleep."
+
* When Xen is ready for the VCPU to run, it will call
+
* the vcpu_wake scheduler callback function and our
+
* scheduler will mark the VCPU awake.
+
*/
+
inf->vc = v;
+
inf->awake = 0;
+
list_add(&inf->list, &prv->vcpu_list);
+
update_schedule_vcpus(ops);
+
}
+
+
return inf;
+} /* end
arinc653_alloc_vdata */
+
+/**
+ * Xen scheduler
callback function to free up VCPU data.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
priv Pointer to the VCPU structure
+ *
+ *
@return <None>
+ */
+static void
arinc653_free_vdata(const struct scheduler *ops, void *priv)
+{
+
/* Free the arinc653_vcpu structure */
+
xfree(AVCPU((struct vcpu *)priv));
+} /* end
arinc653_free_vdata */
+
+/**
+ * Xen scheduler
callback function to allocate and initialize a data structure
+ * containing
domain-specific data.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
dom Pointer to data structure with data for
the current domain
+
*
[Not Used]
+ *
+ * @return
void* <ul>
+
*
<li> address of the allocated data structure
+
*
</ul>
+ */
+static void *
+arinc653_alloc_domdata(const
struct scheduler *ops, struct domain *dom)
+{
+
void *mem;
+
+
/* Allocate memory for the domain-specific data structure */
+
mem = xmalloc(struct arinc653_dom_info);
+
if ( mem == NULL )
+
{
+
return NULL;
+
}
+
+
/* Initialize the allocated memory */
+
memset(mem, 0, sizeof(struct arinc653_dom_info));
+
+
return mem;
+} /* end
arinc653_alloc_domdata */
+
+/**
+ * Xen scheduler
callback function to free up domain-specific data.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
data Pointer to the domain-specific data
structure
+ *
+ *
@return <None>
+ */
+static void
arinc653_free_domdata(const struct scheduler *ops, void *data)
+{
+
/* free the domain-specific data structure */
+
xfree(data);
+} /* end
arinc653_free_domdata */
+
+/**
+ * Xen scheduler
callback function to initialize a domain.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
dom Pointer to domain-specific data
structure
+ *
+ * @return
int <ul>
+
*
<li> 0 for success
+
*
<li> -ENOMEM if out of memory
+
*
</ul>
+ */
+static int
arinc653_init_domain(const struct scheduler *ops,
+
struct domain *dom)
+{
+
/* Don't allocate a data structure for an idle domain */
+
if ( is_idle_domain(dom) )
+
{
+
return 0;
+
}
+
+
/* Allocate memory for the domain. */
+
dom->sched_priv = arinc653_alloc_domdata(ops, dom);
+
if ( dom->sched_priv == NULL )
+
{
+
return -ENOMEM;
+
}
+
+
return 0;
+} /* end
arinc653_init_domain */
+
+/**
+ * Xen scheduler
callback function to destroy a domain.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
dom Pointer to domain-specific data
structure
+ */
+static void
arinc653_destroy_domain(const struct scheduler *ops,
+
struct domain *dom)
+{
+
arinc653_free_domdata(ops, dom->sched_priv);
+} /* end
arinc653_destroy_domain */
+
+/**
+ * Xen scheduler
callback function to remove a VCPU.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
v Pointer to the VCPU structure
to remove
+ *
+ *
@return <None>
+ */
+static void
arinc653_destroy_vcpu(const struct scheduler *ops, struct vcpu * v)
+{
+
if (AVCPU(v) != NULL)
+
{
+
/* remove the VCPU from whichever list it is on */
+
list_del(&AVCPU(v)->list);
+
/* free the arinc653_vcpu structure */
+
arinc653_free_vdata(ops, v);
+
update_schedule_vcpus(ops);
+
}
+} /* end
arinc653_destroy_vcpu */
+
+/**
+ * Xen scheduler
callback function to select a VCPU to run.
+ * This is the main
scheduler routine.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
t Current time
+ * @param
tasklet_work_scheduled
+
*
[Not Used]
+ *
+ *
@return Time slice and
address of the VCPU structure for the chosen
+
*
domain
+ */
+static struct
task_slice arinc653_do_schedule(const struct scheduler *ops,
+
s_time_t t,
+
bool_t tasklet_work_scheduled)
+{
+
arinc653_sched_private_t *prv = ops->sched_data;
+
+
struct task_slice
ret;
/* hold the chosen domain */
+
struct vcpu * new_task = NULL;
+
static int sched_index = 0;
+
static s_time_t last_major_frame;
+
static s_time_t last_switch_time;
+
static s_time_t next_switch_time;
+
+
if (t >= prv->next_major_frame)
+
{
+
/* time to enter a new major frame
+
* the first time this function is called, this will be true */
+
sched_index = 0;
+
last_major_frame = last_switch_time = t;
+
prv->next_major_frame = t + prv->arinc653_major_frame;
+
}
+
else if (t >= next_switch_time)
+
{
+
/* time to switch to the next domain in this major frame */
+
sched_index++;
+
last_switch_time = next_switch_time;
+
}
+
+
/*
+
* If there are more domains to run in the current major frame, set
+
* next_switch_time equal to the last switch time + this domain's run time.
+
* Otherwise, set next_switch_time equal to the start of the next major
+
* frame.
+
*/
+
next_switch_time = (sched_index < prv->num_schedule_entries)
+
? last_switch_time + prv->arinc653_schedule[sched_index].runtime
+
: prv->next_major_frame;
+
+
/*
+
* If there are more domains to run in the current major frame, set
+
* new_task equal to the address of next domain's VCPU structure.
+
* Otherwise, set new_task equal to the address of the idle task's VCPU
+
* structure.
+
*/
+
new_task = (sched_index < prv->num_schedule_entries)
+
? prv->arinc653_schedule[sched_index].vc
+
: IDLETASK(0);
+
+
/* Check to see if the new task can be run (awake & runnable). */
+
if (!((new_task != NULL)
+
&& AVCPU(new_task)->awake
+
&& vcpu_runnable(new_task)) )
+
{
+
new_task = IDLETASK(0);
+
}
+
BUG_ON(new_task == NULL);
+
+
/*
+
* Check to make sure we did not miss a major frame.
+
* This is a good test for robust partitioning.
+
*/
+
BUG_ON(t >= prv->next_major_frame);
+
+
/*
+
* Return the amount of time the next domain has to run and the address
+
* of the selected task's VCPU structure.
+
*/
+
ret.time = next_switch_time - t;
+
ret.task = new_task;
+
+
BUG_ON(ret.time <= 0);
+
+
return ret;
+} /* end
arinc653_do_schedule */
+
+/**
+ * Xen scheduler
callback function to select a CPU for the VCPU to run on.
+ * Currently only
one CPU is supported.
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler
+ * @param
v Pointer to the VCPU structure
for the current domain
+ *
+ *
@return Number of
selected physical CPU
+ */
+static int
arinc653_pick_cpu(const struct scheduler *ops, struct vcpu *v)
+{
+
/* this implementation only supports one physical CPU */
+
return 0;
+} /* end
arinc653_pick_cpu */
+
+/**
+ * Xen scheduler
callback function to wake up a VCPU
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
vc Pointer to the VCPU structure for
the current domain
+ *
+ *
@return <None>
+ */
+static void
arinc653_vcpu_wake(const struct scheduler *ops, struct vcpu *vc)
+{
+
/* boolean flag to indicate first run */
+
static bool_t dont_raise_softirq = 0;
+
+
if (AVCPU(vc) != NULL) /* check that this is a VCPU we are tracking */
+
{
+
AVCPU(vc)->awake = 1;
+
}
+
+
/* the first time the vcpu_wake function is called, we should raise
+
* a softirq to invoke the do_scheduler callback */
+
if (!dont_raise_softirq)
+
{
+
cpu_raise_softirq(vc->processor, SCHEDULE_SOFTIRQ);
+
dont_raise_softirq = 1;
+
}
+} /* end
arinc653_vcpu_wake */
+
+/**
+ * Xen scheduler
callback function to sleep a VCPU
+ *
+ * @param
ops Pointer to data structure with data
& functions for the
+
*
current scheduler [Not Used]
+ * @param
vc Pointer to the VCPU structure for
the current domain
+ *
+ *
@return <None>
+ */
+static void
arinc653_vcpu_sleep(const struct scheduler *ops, struct vcpu *vc)
+{
+
if (AVCPU(vc) != NULL) /* check that this is a VCPU we are tracking */
+
{
+
AVCPU(vc)->awake = 0;
+
}
+
+
/* if the VCPU being put to sleep is the same one that is currently
+
* running, raise a softirq to invoke the scheduler to switch domains */
+
if (per_cpu(schedule_data, vc->processor).curr == vc)
+
{
+
cpu_raise_softirq(vc->processor, SCHEDULE_SOFTIRQ);
+
}
+} /* end
arinc653_vcpu_sleep */
+
+/**
+ * This structure
defines our scheduler for Xen.
+ * The entries tell
Xen where to find our scheduler-specific
+ * callback
functions.
+ * The symbol must
be visible to the rest of Xen at link time.
+ */
+struct scheduler
sched_arinc653_def = {
+
.name = "ARINC
653 Scheduler",
+
.opt_name = "arinc653",
+
.sched_id = XEN_SCHEDULER_ARINC653,
+
.sched_data = &arinc653_schedule,
+
+
.init =
arinc653_init,
+/*
.deinit = NULL, */
+
+
.free_vdata = arinc653_free_vdata,
+
.alloc_vdata = arinc653_alloc_vdata,
+
+/*
.free_pdata = NULL, */
+/*
.alloc_pdata = NULL, */
+
.free_domdata = arinc653_free_domdata,
+
.alloc_domdata = arinc653_alloc_domdata,
+
+
.init_domain = arinc653_init_domain,
+ .destroy_domain
= arinc653_destroy_domain,
+
+/*
.insert_vcpu = NULL, */
+
.destroy_vcpu = arinc653_destroy_vcpu,
+
+
.sleep =
arinc653_vcpu_sleep,
+
.wake =
arinc653_vcpu_wake,
+/*
.context_saved = NULL, */
+
+
.do_schedule = arinc653_do_schedule,
+
+
.pick_cpu = arinc653_pick_cpu,
+/*
.adjust = NULL, */
+
.adjust_global = arinc653_adjust_global,
+/*
.dump_settings = NULL, */
+/*
.dump_cpu_state = NULL, */
+
+/*
.tick_suspend = NULL, */
+/*
.tick_resume = NULL, */
+};
diff -rupN
a/xen/common/schedule.c b/xen/common/schedule.c
---
a/xen/common/schedule.c 2010-05-26 17:01:34.000000000
-0400
+++
b/xen/common/schedule.c 2010-06-01 12:30:45.000000000
-0400
@@ -8,6 +8,8 @@
* Author: Rolf Neugebauer & Keir Fraser
*
Updated for generic API by Mark Williamson
*
+
*
ARINC 653 scheduler added by DornerWorks <DornerWorks.com>
+ *
*
Description: Generic CPU scheduling code
*
implements support functionality for the Xen scheduler API.
*
@@ -59,10 +61,12 @@
DEFINE_PER_CPU(struct scheduler *, sched
extern const
struct scheduler sched_sedf_def;
extern const
struct scheduler sched_credit_def;
extern const
struct scheduler sched_credit2_def;
+extern const struct
scheduler sched_arinc653_def;
static const
struct scheduler *schedulers[] = {
&sched_sedf_def,
&sched_credit_def,
&sched_credit2_def,
+
&sched_arinc653_def,
NULL
};
diff -rupN
a/xen/include/public/domctl.h b/xen/include/public/domctl.h
---
a/xen/include/public/domctl.h 2010-05-26 17:01:34.000000000
-0400
+++
b/xen/include/public/domctl.h 2010-06-01 12:30:45.000000000
-0400
@@ -305,6 +305,7 @@
DEFINE_XEN_GUEST_HANDLE(xen_domctl_max_v
#define
XEN_SCHEDULER_SEDF 4
#define
XEN_SCHEDULER_CREDIT 5
#define
XEN_SCHEDULER_CREDIT2 6
+#define
XEN_SCHEDULER_ARINC653 7
/* Set or get
info? */
#define
XEN_DOMCTL_SCHEDOP_putinfo 0
#define
XEN_DOMCTL_SCHEDOP_getinfo 1
diff -rupN
a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
---
a/xen/include/public/sysctl.h 2010-05-26 17:01:34.000000000
-0400
+++
b/xen/include/public/sysctl.h 2010-06-01 12:30:45.000000000
-0400
@@ -22,6 +22,8 @@
* DEALINGS IN
THE SOFTWARE.
*
* Copyright
(c) 2002-2006, K Fraser
+ *
+ * ARINC 653
Scheduler type added by DornerWorks <DornerWorks.com>.
*/
#ifndef
__XEN_PUBLIC_SYSCTL_H__
@@ -539,10 +541,43
@@ DEFINE_XEN_GUEST_HANDLE(xen_sysctl_cpupo
/* Set or get
info? */
#define XEN_SYSCTL_SCHEDOP_putinfo
0
#define
XEN_SYSCTL_SCHEDOP_getinfo 1
+
+/*
+ * This structure
is used to pass a new ARINC 653 schedule from a
+ * privileged
domain (i.e. Dom0) to Xen.
+ */
+#define
ARINC653_MAX_DOMAINS_PER_SCHEDULE 64
+struct
xen_sysctl_sched_arinc653_schedule {
+
/* major_frame holds the time for the new schedule's major frame
+
* in nanoseconds. */
+
int64_t major_frame;
+
/* num_sched_entries holds how many of the entries in the
+
* sched_entries[] array are valid. */
+
uint8_t num_sched_entries;
+
/* The sched_entries array holds the actual schedule entries. */
+
struct {
+
/* dom_handle must match a domain's UUID */
+
xen_domain_handle_t dom_handle;
+
/* If a domain has multiple VCPUs, vcpu_id specifies which one
+
* this schedule entry applies to. It should be set to 0 if
+
* there is only one VCPU for the domain. */
+
int
vcpu_id;
+
/* runtime specifies the amount of time that should be allocated
+
* to this VCPU per major frame. It is specified in nanoseconds */
+
int64_t
runtime;
+
} sched_entries[ARINC653_MAX_DOMAINS_PER_SCHEDULE];
+};
+typedef struct
xen_sysctl_sched_arinc653_schedule
+
xen_sysctl_sched_arinc653_schedule_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_sched_arinc653_schedule_t);
+
struct
xen_sysctl_scheduler_op {
uint32_t sched_id; /* XEN_SCHEDULER_* (domctl.h) */
uint32_t cmd; /* XEN_SYSCTL_SCHEDOP_* */
union {
+
struct xen_sysctl_sched_arinc653 {
+
XEN_GUEST_HANDLE(xen_sysctl_sched_arinc653_schedule_t) schedule;
+
} arinc653;
} u;
};
typedef struct
xen_sysctl_scheduler_op xen_sysctl_scheduler_op_t;
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