[PATCH RFC v2 2/4] libxc: add rt scheduler

[Meng Xu <mengxu@cis.upenn.edu>]

Add xc_sched_rt_* functions to interact with Xen to set/get domain's
parameters for rt scheduler.

Signed-off-by: Sisu Xi <xisisu@gmail.com>
Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
---
 tools/libxc/Makefile  |    1 +
 tools/libxc/xc_rt.c   |   89 +++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h |   12 +++++++
 3 files changed, 102 insertions(+)
 create mode 100644 tools/libxc/xc_rt.c

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 22eef8e..c2b02a4 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -20,6 +20,7 @@ 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_rt.c
 CTRL_SRCS-y       += xc_tbuf.c
 CTRL_SRCS-y       += xc_pm.c
 CTRL_SRCS-y       += xc_cpu_hotplug.c
diff --git a/tools/libxc/xc_rt.c b/tools/libxc/xc_rt.c
new file mode 100644
index 0000000..74a1c3e
--- /dev/null
+++ b/tools/libxc/xc_rt.c
@@ -0,0 +1,89 @@
+/****************************************************************************
+ *
+ *        File: xc_rt.c
+ *      Author: Sisu Xi 
+ *              Meng Xu
+ *
+ * Description: XC Interface to the rt scheduler
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "xc_private.h"
+
+int xc_sched_rt_domain_set(xc_interface *xch,
+                           uint32_t domid,
+                           struct xen_domctl_sched_rt_params *sdom)
+{
+    int rc;
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_scheduler_op;
+    domctl.domain = (domid_t) domid;
+    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RT_DS;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_putinfo;
+    domctl.u.scheduler_op.u.rt.vcpu_index = sdom->index;
+    domctl.u.scheduler_op.u.rt.period = sdom->period;
+    domctl.u.scheduler_op.u.rt.budget = sdom->budget;
+
+    rc = do_domctl(xch, &domctl);
+
+    return rc;
+}
+
+int xc_sched_rt_domain_get(xc_interface *xch,
+                           uint32_t domid,
+                           struct xen_domctl_sched_rt_params *sdom,
+                           uint16_t num_vcpus)
+{
+    int rc;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(sdom, 
+        sizeof(*sdom) * num_vcpus, 
+        XC_HYPERCALL_BUFFER_BOUNCE_OUT);
+
+    if ( xc_hypercall_bounce_pre(xch, sdom) )
+        return -1;
+
+    domctl.cmd = XEN_DOMCTL_scheduler_op;
+    domctl.domain = (domid_t) domid;
+    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RT_DS;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getinfo;
+    set_xen_guest_handle(domctl.u.scheduler_op.u.rt.vcpu, sdom);
+
+    rc = do_domctl(xch, &domctl);
+
+    xc_hypercall_bounce_post(xch, sdom);
+
+    return rc;
+}
+
+int xc_sched_rt_domain_get_num_vcpus(xc_interface *xch,
+                                     uint32_t domid,
+                                     uint16_t *num_vcpus)
+{
+    int rc;
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_scheduler_op;
+    domctl.domain = (domid_t) domid;
+    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RT_DS;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getnumvcpus;
+
+    rc = do_domctl(xch, &domctl);
+
+    *num_vcpus = domctl.u.scheduler_op.u.rt.nr_vcpus;
+    return rc;
+}
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 5beb846..ca38a4f 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -875,6 +875,18 @@ int xc_sched_credit2_domain_get(xc_interface *xch,
                                uint32_t domid,
                                struct xen_domctl_sched_credit2 *sdom);
 
+int xc_sched_rt_domain_set(xc_interface *xch,
+                          uint32_t domid,
+                          struct xen_domctl_sched_rt_params *sdom);
+int xc_sched_rt_domain_get(xc_interface *xch,
+                          uint32_t domid,
+                          struct xen_domctl_sched_rt_params *sdom,
+                          uint16_t num_vcpus);
+
+int xc_sched_rt_domain_get_num_vcpus(xc_interface *xch,
+                                    uint32_t domid,
+                                    uint16_t *num_vcpus);
+
 int
 xc_sched_arinc653_schedule_set(
     xc_interface *xch,
-- 
1.7.9.5