/proc/litmus: Export info. on CPU <-> cluster

This patch adds a framework by which plugins can
export information about CPU <-> cluster (aka
scheduling domain) per cluster.

/proc/litmus/domains/<domain#>: This file contains a CPU
mask describing the CPUs scheduled/managed by that domain.
Files are named by index. For example, the first scheduling
domain would be '0'.

/proc/litmus/cpus/<cpus#>: This file contains a domain
mask describing which domains manage this CPU. Normally,
only one bit will be set in this mask, but overlapping clusters
can also be expressed by setting multiple bits.

1 files changed, 38 insertions, 0 deletions

diff --git a/include/litmus/litmus_proc.h b/include/litmus/litmus_proc.h
index 6800e725d48c..a5db24c03ec0 100644
--- a/include/litmus/litmus_proc.h
+++ b/include/litmus/litmus_proc.h
@@ -4,6 +4,22 @@
 int __init init_litmus_proc(void);
 void exit_litmus_proc(void);
 
+struct cd_mapping
+{
+        int id;
+        cpumask_var_t mask;
+        struct proc_dir_entry *proc_file;
+};
+
+struct domain_proc_info
+{
+        int num_cpus;
+        int num_domains;
+
+        struct cd_mapping *cpu_to_domains;
+        struct cd_mapping *domain_to_cpus;
+};
+
 /*
  * On success, returns 0 and sets the pointer to the location of the new
  * proc dir entry, otherwise returns an error code and sets pde to NULL.
@@ -17,6 +33,28 @@ long make_plugin_proc_dir(struct sched_plugin* plugin,
  */
 void remove_plugin_proc_dir(struct sched_plugin* plugin);
 
+/*
+ * Setup the CPU <-> sched domain mappings in proc
+ */
+long activate_domain_proc(struct domain_proc_info* map);
+
+/*
+ * Remove the CPU <-> sched domain mappings from proc
+ */
+long deactivate_domain_proc(void);
+
+/*
+ * Alloc memory for the mapping
+ * Note: Does not set up proc files. Use make_sched_domain_maps for that.
+ */
+long init_domain_proc_info(struct domain_proc_info* map,
+        int num_cpus, int num_domains);
+
+/*
+ * Free memory of the mapping
+ * Note: Does not clean up proc files. Use deactivate_domain_proc for that.
+ */
+void destroy_domain_proc_info(struct domain_proc_info* map);
 
 /* Copy at most size-1 bytes from ubuf into kbuf, null-terminate buf, and
  * remove a '\n' if present. Returns the number of bytes that were read or