G-EDF: Export cluster configuration to /proc

This patch updates G-EDF to support get_domain_proc_info().

1 files changed, 52 insertions, 0 deletions

diff --git a/litmus/sched_gsn_edf.c b/litmus/sched_gsn_edf.c
index 66ffa3e7a7bd..34e6cff9753e 100644
--- a/litmus/sched_gsn_edf.c
+++ b/litmus/sched_gsn_edf.c
@@ -29,6 +29,9 @@
 #include <litmus/affinity.h>
 #endif
 
+/* to set up domain/cpu mappings */
+#include <litmus/litmus_proc.h>
+
 #include <linux/module.h>
 
 /* Overview of GSN-EDF operations.
@@ -964,6 +967,44 @@ static long gsnedf_allocate_lock(struct litmus_lock **lock, int type,
 
 #endif
 
+static struct domain_proc_info gsnedf_domain_proc_info;
+static long gsnedf_get_domain_proc_info(struct domain_proc_info **ret)
+{
+        *ret = &gsnedf_domain_proc_info;
+        return 0;
+}
+
+static void gsnedf_setup_domain_proc(void)
+{
+        int i, cpu;
+        int release_master =
+#ifdef CONFIG_RELEASE_MASTER
+                        atomic_read(&release_master_cpu);
+#else
+                NO_CPU;
+#endif
+        int num_rt_cpus = num_online_cpus() - (release_master != NO_CPU);
+        struct cd_mapping *map;
+
+        memset(&gsnedf_domain_proc_info, sizeof(gsnedf_domain_proc_info), 0);
+        init_domain_proc_info(&gsnedf_domain_proc_info, num_rt_cpus, 1);
+        gsnedf_domain_proc_info.num_cpus = num_rt_cpus;
+        gsnedf_domain_proc_info.num_domains = 1;
+
+        gsnedf_domain_proc_info.domain_to_cpus[0].id = 0;
+        for (cpu = 0, i = 0; cpu < num_online_cpus(); ++cpu) {
+                if (cpu == release_master)
+                        continue;
+                map = &gsnedf_domain_proc_info.cpu_to_domains[i];
+                map->id = cpu;
+                cpumask_set_cpu(0, map->mask);
+                ++i;
+
+                /* add cpu to the domain */
+                cpumask_set_cpu(cpu,
+                        gsnedf_domain_proc_info.domain_to_cpus[0].mask);
+        }
+}
 
 static long gsnedf_activate_plugin(void)
 {
@@ -991,6 +1032,15 @@ static long gsnedf_activate_plugin(void)
                 }
 #endif
         }
+
+        gsnedf_setup_domain_proc();
+
+        return 0;
+}
+
+static long gsnedf_deactivate_plugin(void)
+{
+        destroy_domain_proc_info(&gsnedf_domain_proc_info);
         return 0;
 }
 
@@ -1007,6 +1057,8 @@ static struct sched_plugin gsn_edf_plugin __cacheline_aligned_in_smp = {
         .task_block             = gsnedf_task_block,
         .admit_task             = gsnedf_admit_task,
         .activate_plugin        = gsnedf_activate_plugin,
+        .deactivate_plugin      = gsnedf_deactivate_plugin,
+        .get_domain_proc_info   = gsnedf_get_domain_proc_info,
 #ifdef CONFIG_LITMUS_LOCKING
         .allocate_lock          = gsnedf_allocate_lock,
 #endif