# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1291238414 0
# Node ID c443d02158542a9509f2521089ad6f29e290e6df
# Parent c2cb776a5365bd3891174e7375d9079a76b37008
ARINC 653 scheduler
From: Josh Holtrop <Josh.Holtrop@xxxxxxxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
tools/libxc/Makefile | 1
tools/libxc/xc_arinc653.c | 85 +++++
tools/libxc/xenctrl.h | 10
xen/common/Makefile | 1
xen/common/sched_arinc653.c | 698 ++++++++++++++++++++++++++++++++++++++++++++
xen/common/schedule.c | 2
xen/include/public/domctl.h | 1
xen/include/public/sysctl.h | 31 +
8 files changed, 829 insertions(+)
diff -r c2cb776a5365 -r c443d0215854 tools/libxc/Makefile
--- a/tools/libxc/Makefile Wed Dec 01 20:12:12 2010 +0000
+++ b/tools/libxc/Makefile Wed Dec 01 21:20:14 2010 +0000
@@ -19,6 +19,7 @@ CTRL_SRCS-y += xc_sedf.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 -r c2cb776a5365 -r c443d0215854 tools/libxc/xc_arinc653.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/libxc/xc_arinc653.c Wed Dec 01 21:20:14 2010 +0000
@@ -0,0 +1,85 @@
+/******************************************************************************
+ * xc_arinc653.c
+ *
+ * XC interface to the ARINC653 scheduler
+ *
+ * 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) 2010 DornerWorks, Ltd. <DornerWorks.com>
+ */
+
+#include "xc_private.h"
+
+int
+xc_sched_arinc653_schedule_set(
+ xc_interface *xch,
+ struct xen_sysctl_arinc653_schedule *schedule)
+{
+ int rc;
+ DECLARE_SYSCTL;
+ DECLARE_HYPERCALL_BOUNCE(
+ schedule,
+ sizeof(*schedule),
+ XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+ if ( xc_hypercall_bounce_pre(xch, schedule) )
+ return -1;
+
+ sysctl.cmd = XEN_SYSCTL_scheduler_op;
+ sysctl.u.scheduler_op.cpupool_id = 0;
+ 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.sched_arinc653.schedule,
+ schedule);
+
+ rc = do_sysctl(xch, &sysctl);
+
+ xc_hypercall_bounce_post(xch, schedule);
+
+ return rc;
+}
+
+int
+xc_sched_arinc653_schedule_get(
+ xc_interface *xch,
+ struct xen_sysctl_arinc653_schedule *schedule)
+{
+ int rc;
+ DECLARE_SYSCTL;
+ DECLARE_HYPERCALL_BOUNCE(
+ schedule,
+ sizeof(*schedule),
+ XC_HYPERCALL_BUFFER_BOUNCE_OUT);
+
+ if ( xc_hypercall_bounce_pre(xch, schedule) )
+ return -1;
+
+ sysctl.cmd = XEN_SYSCTL_scheduler_op;
+ sysctl.u.scheduler_op.cpupool_id = 0;
+ sysctl.u.scheduler_op.sched_id = XEN_SCHEDULER_ARINC653;
+ sysctl.u.scheduler_op.cmd = XEN_SYSCTL_SCHEDOP_getinfo;
+ set_xen_guest_handle(sysctl.u.scheduler_op.u.sched_arinc653.schedule,
+ schedule);
+
+ rc = do_sysctl(xch, &sysctl);
+
+ xc_hypercall_bounce_post(xch, schedule);
+
+ return rc;
+}
diff -r c2cb776a5365 -r c443d0215854 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Wed Dec 01 20:12:12 2010 +0000
+++ b/tools/libxc/xenctrl.h Wed Dec 01 21:20:14 2010 +0000
@@ -644,6 +644,16 @@ int xc_sched_credit2_domain_get(xc_inter
int xc_sched_credit2_domain_get(xc_interface *xch,
uint32_t domid,
struct xen_domctl_sched_credit2 *sdom);
+
+int
+xc_sched_arinc653_schedule_set(
+ xc_interface *xch,
+ struct xen_sysctl_arinc653_schedule *schedule);
+
+int
+xc_sched_arinc653_schedule_get(
+ xc_interface *xch,
+ struct xen_sysctl_arinc653_schedule *schedule);
/**
* This function sends a trigger to a domain.
diff -r c2cb776a5365 -r c443d0215854 xen/common/Makefile
--- a/xen/common/Makefile Wed Dec 01 20:12:12 2010 +0000
+++ b/xen/common/Makefile Wed Dec 01 21:20:14 2010 +0000
@@ -18,6 +18,7 @@ obj-y += sched_credit.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 -r c2cb776a5365 -r c443d0215854 xen/common/sched_arinc653.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/common/sched_arinc653.c Wed Dec 01 21:20:14 2010 +0000
@@ -0,0 +1,698 @@
+/******************************************************************************
+ * sched_arinc653.c
+ *
+ * An ARINC653-compatible scheduling algorithm for use in Xen.
+ *
+ * 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) 2010, DornerWorks, Ltd. <DornerWorks.com>
+ */
+
+#include <xen/config.h>
+#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 <xen/guest_access.h>
+#include <public/sysctl.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)
+
+/**
+ * Return the global scheduler private data given the scheduler ops pointer
+ */
+#define SCHED_PRIV(s) ((a653sched_priv_t *)((s)->sched_data))
+
+/**************************************************************************
+ * Private Type Definitions *
+ **************************************************************************/
+
+/**
+ * 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;
+
+/**
+ * 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;
+
+/**
+ * This structure defines data that is global to an instance of the scheduler
+ */
+typedef struct a653sched_priv_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 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.
+ */
+ int num_schedule_entries;
+
+ /**
+ * the major frame time for the ARINC 653 schedule.
+ */
+ s_time_t major_frame;
+
+ /**
+ * the time that the next major frame starts
+ */
+ s_time_t next_major_frame;
+
+ /**
+ * pointers to all Xen VCPU structures for iterating through
+ */
+ struct list_head vcpu_list;
+} a653sched_priv_t;
+
+/**************************************************************************
+ * Helper 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));
+}
+
+/**
+ * This function searches the vcpu list to find a VCPU that matches
+ * the domain handle and VCPU ID specified.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param handle Pointer to handler
+ * @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_vcpu_t *avcpu;
+
+ /* loop through the vcpu_list looking for the specified VCPU */
+ list_for_each_entry ( avcpu, &SCHED_PRIV(ops)->vcpu_list, list )
+ if ( (dom_handle_cmp(avcpu->vc->domain->handle, handle) == 0)
+ && (vcpu_id == avcpu->vc->vcpu_id) )
+ return avcpu->vc;
+
+ return NULL;
+}
+
+/**
+ * This function updates the pointer to the Xen VCPU structure for each entry
+ * in the ARINC 653 schedule.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @return <None>
+ */
+static void update_schedule_vcpus(const struct scheduler *ops)
+{
+ unsigned int i, n_entries = SCHED_PRIV(ops)->num_schedule_entries;
+
+ for ( i = 0; i < n_entries; i++ )
+ SCHED_PRIV(ops)->schedule[i].vc =
+ find_vcpu(ops,
+ SCHED_PRIV(ops)->schedule[i].dom_handle,
+ SCHED_PRIV(ops)->schedule[i].vcpu_id);
+}
+
+/**
+ * This function is called by the adjust_global scheduler hook to put
+ * in place a new ARINC653 schedule.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ *
+ * @return <ul>
+ * <li> 0 = success
+ * <li> !0 = error
+ * </ul>
+ */
+static int
+arinc653_sched_set(
+ const struct scheduler *ops,
+ struct xen_sysctl_arinc653_schedule *schedule)
+{
+ a653sched_priv_t *sched_priv = SCHED_PRIV(ops);
+ s_time_t total_runtime = 0;
+ bool_t found_dom0 = 0;
+ const static xen_domain_handle_t dom0_handle = {0};
+ unsigned int i;
+
+ /* 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) )
+ goto fail;
+
+ for ( i = 0; i < schedule->num_sched_entries; i++ )
+ {
+ 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) )
+ goto fail;
+
+ /* Add this entry's run time to total run time. */
+ total_runtime += schedule->sched_entries[i].runtime;
+ }
+
+ /* Error if the schedule doesn't contain a slot for domain 0. */
+ if ( !found_dom0 )
+ goto fail;
+
+ /*
+ * 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 )
+ goto fail;
+
+ /* Copy the new schedule into place. */
+ sched_priv->num_schedule_entries = schedule->num_sched_entries;
+ sched_priv->major_frame = schedule->major_frame;
+ for ( i = 0; i < schedule->num_sched_entries; i++ )
+ {
+ memcpy(sched_priv->schedule[i].dom_handle,
+ schedule->sched_entries[i].dom_handle,
+ sizeof(sched_priv->schedule[i].dom_handle));
+ sched_priv->schedule[i].vcpu_id =
+ schedule->sched_entries[i].vcpu_id;
+ sched_priv->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.
+ */
+ sched_priv->next_major_frame = NOW();
+
+ return 0;
+
+ fail:
+ return -EINVAL;
+}
+
+/**
+ * This function is called by the adjust_global scheduler hook to read the
+ * current ARINC 653 schedule
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @return <ul>
+ * <li> 0 = success
+ * <li> !0 = error
+ * </ul>
+ */
+static int
+arinc653_sched_get(
+ const struct scheduler *ops,
+ struct xen_sysctl_arinc653_schedule *schedule)
+{
+ a653sched_priv_t *sched_priv = SCHED_PRIV(ops);
+ unsigned int i;
+
+ schedule->num_sched_entries = sched_priv->num_schedule_entries;
+ schedule->major_frame = sched_priv->major_frame;
+ for ( i = 0; i < sched_priv->num_schedule_entries; i++ )
+ {
+ memcpy(schedule->sched_entries[i].dom_handle,
+ sched_priv->schedule[i].dom_handle,
+ sizeof(sched_priv->schedule[i].dom_handle));
+ schedule->sched_entries[i].vcpu_id = sched_priv->schedule[i].vcpu_id;
+ schedule->sched_entries[i].runtime = sched_priv->schedule[i].runtime;
+ }
+
+ return 0;
+}
+
+/**************************************************************************
+ * Scheduler callback functions *
+ **************************************************************************/
+
+/**
+ * This function performs initialization for an instance of the scheduler.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ *
+ * @return <ul>
+ * <li> 0 = success
+ * <li> !0 = error
+ * </ul>
+ */
+static int
+a653sched_init(struct scheduler *ops)
+{
+ a653sched_priv_t *prv;
+
+ prv = xmalloc(a653sched_priv_t);
+ if ( prv == NULL )
+ return -ENOMEM;
+
+ memset(prv, 0, sizeof(*prv));
+ ops->sched_data = prv;
+
+ prv->schedule[0].dom_handle[0] = '\0';
+ prv->schedule[0].vcpu_id = 0;
+ prv->schedule[0].runtime = MILLISECS(10);
+ prv->schedule[0].vc = NULL;
+ prv->num_schedule_entries = 1;
+ prv->major_frame = MILLISECS(10);
+ prv->next_major_frame = 0;
+ INIT_LIST_HEAD(&prv->vcpu_list);
+
+ return 0;
+}
+
+/**
+ * This function performs deinitialization for an instance of the scheduler
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ */
+static void
+a653sched_deinit(const struct scheduler *ops)
+{
+ xfree(SCHED_PRIV(ops));
+}
+
+/**
+ * This function allocates scheduler-specific data for a VCPU
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ *
+ * @return Pointer to the allocated data
+ */
+static void *
+a653sched_alloc_vdata(const struct scheduler *ops, struct vcpu *vc, void *dd)
+{
+ /*
+ * Allocate memory for the ARINC 653-specific scheduler data information
+ * associated with the given VCPU (vc).
+ */
+ if ( (vc->sched_priv = xmalloc(arinc653_vcpu_t)) == NULL )
+ return 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.
+ */
+ AVCPU(vc)->vc = vc;
+ AVCPU(vc)->awake = 0;
+ if ( !is_idle_vcpu(vc) )
+ list_add(&AVCPU(vc)->list, &SCHED_PRIV(ops)->vcpu_list);
+ update_schedule_vcpus(ops);
+
+ return AVCPU(vc);
+}
+
+/**
+ * This function frees scheduler-specific VCPU data
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ */
+static void
+a653sched_free_vdata(const struct scheduler *ops, void *priv)
+{
+ arinc653_vcpu_t *av = priv;
+
+ if (av == NULL)
+ return;
+
+ list_del(&av->list);
+ xfree(av);
+ update_schedule_vcpus(ops);
+}
+
+/**
+ * This function allocates scheduler-specific data for a physical CPU
+ *
+ * We do not actually make use of any per-CPU data but the hypervisor expects
+ * a non-NULL return value
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ *
+ * @return Pointer to the allocated data
+ */
+static void *
+a653sched_alloc_pdata(const struct scheduler *ops, int cpu)
+{
+ /* return a non-NULL value to keep schedule.c happy */
+ return SCHED_PRIV(ops);
+}
+
+/**
+ * This function frees scheduler-specific data for a physical CPU
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ */
+static void
+a653sched_free_pdata(const struct scheduler *ops, void *pcpu, int cpu)
+{
+ /* nop */
+}
+
+/**
+ * This function allocates scheduler-specific data for a domain
+ *
+ * We do not actually make use of any per-domain data but the hypervisor
+ * expects a non-NULL return value
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ *
+ * @return Pointer to the allocated data
+ */
+static void *
+a653sched_alloc_domdata(const struct scheduler *ops, struct domain *dom)
+{
+ /* return a non-NULL value to keep schedule.c happy */
+ return SCHED_PRIV(ops);
+}
+
+/**
+ * This function frees scheduler-specific data for a domain
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ */
+static void
+a653sched_free_domdata(const struct scheduler *ops, void *data)
+{
+ /* nop */
+}
+
+/**
+ * Xen scheduler callback function to sleep a VCPU
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param vc Pointer to the VCPU structure for the current domain
+ */
+static void
+a653sched_vcpu_sleep(const struct scheduler *ops, struct vcpu *vc)
+{
+ if ( AVCPU(vc) != NULL )
+ 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);
+}
+
+/**
+ * Xen scheduler callback function to wake up a VCPU
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param vc Pointer to the VCPU structure for the current domain
+ */
+static void
+a653sched_vcpu_wake(const struct scheduler *ops, struct vcpu *vc)
+{
+ if ( AVCPU(vc) != NULL )
+ AVCPU(vc)->awake = 1;
+
+ cpu_raise_softirq(vc->processor, SCHEDULE_SOFTIRQ);
+}
+
+/**
+ * Xen scheduler callback function to select a VCPU to run.
+ * This is the main scheduler routine.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param now Current time
+ *
+ * @return Address of the VCPU structure scheduled to be run next
+ * Amount of time to execute the returned VCPU
+ * Flag for whether the VCPU was migrated
+ */
+static struct task_slice
+a653sched_do_schedule(
+ const struct scheduler *ops,
+ s_time_t now,
+ bool_t tasklet_work_scheduled)
+{
+ struct task_slice ret; /* hold the chosen domain */
+ struct vcpu * new_task = NULL;
+ static int sched_index = 0;
+ static s_time_t next_switch_time;
+ a653sched_priv_t *sched_priv = SCHED_PRIV(ops);
+
+ if ( now >= sched_priv->next_major_frame )
+ {
+ /* time to enter a new major frame
+ * the first time this function is called, this will be true */
+ /* start with the first domain in the schedule */
+ sched_index = 0;
+ sched_priv->next_major_frame = now + sched_priv->major_frame;
+ next_switch_time = now + sched_priv->schedule[0].runtime;
+ }
+ else
+ {
+ while ( (now >= next_switch_time)
+ && (sched_index < sched_priv->num_schedule_entries) )
+ {
+ /* time to switch to the next domain in this major frame */
+ sched_index++;
+ next_switch_time += sched_priv->schedule[sched_index].runtime;
+ }
+ }
+
+ /*
+ * If we exhausted the domains in the schedule and still have time left
+ * in the major frame then switch next at the next major frame.
+ */
+ if ( sched_index >= sched_priv->num_schedule_entries )
+ next_switch_time = sched_priv->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 < sched_priv->num_schedule_entries)
+ ? sched_priv->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) != 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(now >= sched_priv->next_major_frame);
+
+ /* Tasklet work (which runs in idle VCPU context) overrides all else. */
+ if ( tasklet_work_scheduled )
+ new_task = IDLETASK(0);
+
+ /*
+ * 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 - now;
+ ret.task = new_task;
+ ret.migrated = 0; /* we do not support migration */
+
+ BUG_ON(ret.time <= 0);
+
+ return ret;
+}
+
+/**
+ * Xen scheduler callback function to select a CPU for the VCPU to run on
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param v Pointer to the VCPU structure for the current domain
+ *
+ * @return Number of selected physical CPU
+ */
+static int
+a653sched_pick_cpu(const struct scheduler *ops, struct vcpu *vc)
+{
+ /* this implementation only supports one physical CPU */
+ return 0;
+}
+
+/**
+ * Xen scheduler callback function to perform a global (not domain-specific)
+ * adjustment. It is used by the ARINC 653 scheduler to put in place a new
+ * ARINC 653 schedule or to retrieve the schedule currently in place.
+ *
+ * @param ops Pointer to this instance of the scheduler structure
+ * @param sc Pointer to the scheduler operation specified by Domain 0
+ */
+static int
+a653sched_adjust_global(const struct scheduler *ops,
+ struct xen_sysctl_scheduler_op *sc)
+{
+ xen_sysctl_arinc653_schedule_t local_sched;
+ int rc = -EINVAL;
+
+ switch ( sc->cmd )
+ {
+ case XEN_SYSCTL_SCHEDOP_putinfo:
+ copy_from_guest(&local_sched, sc->u.sched_arinc653.schedule, 1);
+ rc = arinc653_sched_set(ops, &local_sched);
+ break;
+ case XEN_SYSCTL_SCHEDOP_getinfo:
+ rc = arinc653_sched_get(ops, &local_sched);
+ copy_to_guest(sc->u.sched_arinc653.schedule, &local_sched, 1);
+ break;
+ }
+
+ return rc;
+}
+
+/**
+ * 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 = NULL,
+
+ .init = a653sched_init,
+ .deinit = a653sched_deinit,
+
+ .free_vdata = a653sched_free_vdata,
+ .alloc_vdata = a653sched_alloc_vdata,
+
+ .free_pdata = a653sched_free_pdata,
+ .alloc_pdata = a653sched_alloc_pdata,
+
+ .free_domdata = a653sched_free_domdata,
+ .alloc_domdata = a653sched_alloc_domdata,
+
+ .init_domain = NULL,
+ .destroy_domain = NULL,
+
+ .insert_vcpu = NULL,
+ .remove_vcpu = NULL,
+
+ .sleep = a653sched_vcpu_sleep,
+ .wake = a653sched_vcpu_wake,
+ .yield = NULL,
+ .context_saved = NULL,
+
+ .do_schedule = a653sched_do_schedule,
+
+ .pick_cpu = a653sched_pick_cpu,
+
+ .adjust = NULL,
+ .adjust_global = a653sched_adjust_global,
+
+ .dump_settings = NULL,
+ .dump_cpu_state = NULL,
+
+ .tick_suspend = NULL,
+ .tick_resume = NULL,
+};
diff -r c2cb776a5365 -r c443d0215854 xen/common/schedule.c
--- a/xen/common/schedule.c Wed Dec 01 20:12:12 2010 +0000
+++ b/xen/common/schedule.c Wed Dec 01 21:20:14 2010 +0000
@@ -60,10 +60,12 @@ extern const struct scheduler sched_sedf
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 -r c2cb776a5365 -r c443d0215854 xen/include/public/domctl.h
--- a/xen/include/public/domctl.h Wed Dec 01 20:12:12 2010 +0000
+++ b/xen/include/public/domctl.h Wed Dec 01 21:20:14 2010 +0000
@@ -300,6 +300,7 @@ 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 -r c2cb776a5365 -r c443d0215854 xen/include/public/sysctl.h
--- a/xen/include/public/sysctl.h Wed Dec 01 20:12:12 2010 +0000
+++ b/xen/include/public/sysctl.h Wed Dec 01 21:20:14 2010 +0000
@@ -542,6 +542,34 @@ typedef struct xen_sysctl_cpupool_op xen
typedef struct xen_sysctl_cpupool_op xen_sysctl_cpupool_op_t;
DEFINE_XEN_GUEST_HANDLE(xen_sysctl_cpupool_op_t);
+#define ARINC653_MAX_DOMAINS_PER_SCHEDULE 64
+/*
+ * This structure is used to pass a new ARINC653 schedule from a
+ * privileged domain (ie dom0) to Xen.
+ */
+struct xen_sysctl_arinc653_schedule {
+ /* major_frame holds the time for the new schedule's major frame
+ * in nanoseconds. */
+ uint64_aligned_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. */
+ unsigned int vcpu_id;
+ /* runtime specifies the amount of time that should be allocated
+ * to this VCPU per major frame. It is specified in nanoseconds */
+ uint64_aligned_t runtime;
+ } sched_entries[ARINC653_MAX_DOMAINS_PER_SCHEDULE];
+};
+typedef struct xen_sysctl_arinc653_schedule xen_sysctl_arinc653_schedule_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_arinc653_schedule_t);
+
/* XEN_SYSCTL_scheduler_op */
/* Set or get info? */
#define XEN_SYSCTL_SCHEDOP_putinfo 0
@@ -551,6 +579,9 @@ 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_64(xen_sysctl_arinc653_schedule_t) schedule;
+ } sched_arinc653;
} u;
};
typedef struct xen_sysctl_scheduler_op xen_sysctl_scheduler_op_t;
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