[PATCH RFC v1 4/4] libxc for 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   |   81 +++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h |    7 +++++
 3 files changed, 89 insertions(+)
 create mode 100644 tools/libxc/xc_rt.c

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index f77677c..7ad6dea 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..a3e76a1
--- /dev/null
+++ b/tools/libxc/xc_rt.c
@@ -0,0 +1,81 @@
+/****************************************************************************
+ *
+ *        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;
+    DECLARE_HYPERCALL_BOUNCE(sdom, 
+        sizeof(*sdom), 
+        XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+    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;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_putinfo;
+    set_xen_guest_handle(domctl.u.scheduler_op.u.rt.schedule, sdom);
+
+    rc = do_domctl(xch, &domctl);
+
+    xc_hypercall_bounce_post(xch, sdom);
+
+    return rc;
+}
+
+int
+xc_sched_rt_domain_get(
+    xc_interface *xch,
+    uint32_t domid,
+    struct xen_domctl_sched_rt_params *sdom)
+{
+    int rc;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(sdom, 
+        sizeof(*sdom), 
+        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;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getinfo;
+    set_xen_guest_handle(domctl.u.scheduler_op.u.rt.schedule, sdom);
+
+    rc = do_domctl(xch, &domctl);
+
+    xc_hypercall_bounce_post(xch, sdom);
+
+    return rc;
+}
+
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 3578b09..b7b0c04 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -865,6 +865,13 @@ 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);
+
 int
 xc_sched_arinc653_schedule_set(
     xc_interface *xch,
-- 
1.7.9.5