[Xen-devel] [PATCH for 4.5 v4 3/4] libxl: add rtds scheduler

[Meng Xu <mengxu@xxxxxxxxxxxxx>]

Add libxl functions to set/get domain's parameters for rtds scheduler
Note: VCPU's information (period, budget) is in microsecond (us).

Signed-off-by: Meng Xu <mengxu@xxxxxxxxxxxxx>
Signed-off-by: Sisu Xi <xisisu@xxxxxxxxx>
Reviewed-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
 tools/libxl/libxl.c         |   72 +++++++++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl.h         |    7 +++++
 tools/libxl/libxl_types.idl |    2 ++
 3 files changed, 81 insertions(+)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index f796da8..233496e 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -5443,6 +5443,72 @@ static int sched_sedf_domain_set(libxl__gc *gc, uint32_t 
domid,
     return 0;
 }
 
+static int sched_rtds_domain_get(libxl__gc *gc, uint32_t domid,
+                               libxl_domain_sched_params *scinfo)
+{
+    struct xen_domctl_sched_rtds sdom;
+    int rc;
+
+    rc = xc_sched_rtds_domain_get(CTX->xch, domid, &sdom);
+    if (rc != 0) {
+        LOGE(ERROR, "getting domain sched rtds");
+        return ERROR_FAIL;
+    }
+
+    libxl_domain_sched_params_init(scinfo);
+
+    scinfo->sched = LIBXL_SCHEDULER_RTDS;
+    scinfo->period = sdom.period;
+    scinfo->budget = sdom.budget;
+
+    return 0;
+}
+
+static int sched_rtds_domain_set(libxl__gc *gc, uint32_t domid,
+                               const libxl_domain_sched_params *scinfo)
+{
+    struct xen_domctl_sched_rtds sdom;
+    int rc;
+
+    rc = xc_sched_rtds_domain_get(CTX->xch, domid, &sdom);
+    if (rc != 0) {
+        LOGE(ERROR, "getting domain sched rtds");
+        return ERROR_FAIL;
+    }
+
+    if (scinfo->period != LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT) {
+        if (scinfo->period < 1) {
+            LOG(ERROR, "VCPU period is not set or out of range, "
+                       "valid values are larger than 1");
+            return ERROR_INVAL;
+        }
+        sdom.period = scinfo->period;
+    }
+
+    if (scinfo->budget != LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT) {
+        if (scinfo->budget < 1) {
+            LOG(ERROR, "VCPU budget is not set or out of range, "
+                       "valid values are larger than 1");
+            return ERROR_INVAL;
+        }
+        sdom.budget = scinfo->budget;
+    }
+
+    if (sdom.budget > sdom.period) {
+        LOG(ERROR, "VCPU budget is larger than VCPU period, "
+                   "VCPU budget should be no larger than VCPU period");
+        return ERROR_INVAL;
+    }
+
+    rc = xc_sched_rtds_domain_set(CTX->xch, domid, &sdom);
+    if (rc < 0) {
+        LOGE(ERROR, "setting domain sched rtds");
+        return ERROR_FAIL;
+    }
+
+    return 0;
+}
+
 int libxl_domain_sched_params_set(libxl_ctx *ctx, uint32_t domid,
                                   const libxl_domain_sched_params *scinfo)
 {
@@ -5466,6 +5532,9 @@ int libxl_domain_sched_params_set(libxl_ctx *ctx, 
uint32_t domid,
     case LIBXL_SCHEDULER_ARINC653:
         ret=sched_arinc653_domain_set(gc, domid, scinfo);
         break;
+    case LIBXL_SCHEDULER_RTDS:
+        ret=sched_rtds_domain_set(gc, domid, scinfo);
+        break;
     default:
         LOG(ERROR, "Unknown scheduler");
         ret=ERROR_INVAL;
@@ -5496,6 +5565,9 @@ int libxl_domain_sched_params_get(libxl_ctx *ctx, 
uint32_t domid,
     case LIBXL_SCHEDULER_CREDIT2:
         ret=sched_credit2_domain_get(gc, domid, scinfo);
         break;
+    case LIBXL_SCHEDULER_RTDS:
+        ret=sched_rtds_domain_get(gc, domid, scinfo);
+        break;
     default:
         LOG(ERROR, "Unknown scheduler");
         ret=ERROR_INVAL;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index bc68cac..b7f4f39 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -145,6 +145,12 @@
 #define LIBXL_HAVE_BUILDINFO_IOMEM_START_GFN 1
 
 /*
+ * LIBXL_HAVE_SCHED_RTDS indicates that the RTDS real time scheduler
+ * is available. A 'budget' field added in libxl_domain_sched_params.
+ */
+#define LIBXL_HAVE_SCHED_RTDS 1
+
+/*
  * libxl ABI compatibility
  *
  * The only guarantee which libxl makes regarding ABI compatibility
@@ -1319,6 +1325,7 @@ int libxl_sched_credit_params_set(libxl_ctx *ctx, 
uint32_t poolid,
 #define LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT     -1
 #define LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT   -1
 #define LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT -1
+#define LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT    -1
 
 int libxl_domain_sched_params_get(libxl_ctx *ctx, uint32_t domid,
                                   libxl_domain_sched_params *params);
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index f1fcbc3..15234d6 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -156,6 +156,7 @@ libxl_scheduler = Enumeration("scheduler", [
     (5, "credit"),
     (6, "credit2"),
     (7, "arinc653"),
+    (8, "rtds"),
     ])
 
 # Consistent with SHUTDOWN_* in sched.h (apart from UNKNOWN)
@@ -318,6 +319,7 @@ libxl_domain_sched_params = Struct("domain_sched_params",[
     ("slice",        integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT'}),
     ("latency",      integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT'}),
     ("extratime",    integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT'}),
+    ("budget",       integer, {'init_val': 
'LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT'}),
     ])
 
 libxl_domain_build_info = Struct("domain_build_info",[
-- 
1.7.9.5


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