New SMP IPI interface function called on_selected_cpus(), currently implemented

only for x86. The x86 implementation of smp_call_function has been simplified 
and is now based on on_slected_cpus().

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 31 insertions, 17 deletions

diff --git a/xen/include/xen/smp.h b/xen/include/xen/smp.h
index f64c5b056d..cefce3ff3f 100644
--- a/xen/include/xen/smp.h
+++ b/xen/include/xen/smp.h
@@ -45,33 +45,35 @@ extern void smp_cpus_done(unsigned int max_cpus);
  * Call a function on all other processors
  */
 extern int smp_call_function(
-    void (*func) (void *info), void *info, int retry, int wait);
+    void (*func) (void *info),
+    void *info,
+    int retry,
+    int wait);
+
+/* 
+ * Call a function on a selection of processors
+ */
+extern int on_selected_cpus(
+    cpumask_t selected,
+    void (*func) (void *info),
+    void *info,
+    int retry,
+    int wait);
 
 /*
  * Call a function on all processors
  */
-static inline int on_each_cpu(void (*func) (void *info), void *info,
-                              int retry, int wait)
+static inline int on_each_cpu(
+    void (*func) (void *info),
+    void *info,
+    int retry,
+    int wait)
 {
     int ret = smp_call_function(func, info, retry, wait);
     func(info);
     return ret;
 }
 
-extern volatile unsigned long smp_msg_data;
-extern volatile int smp_src_cpu;
-extern volatile int smp_msg_id;
-
-#define MSG_ALL_BUT_SELF	0x8000	/* Assume <32768 CPU's */
-#define MSG_ALL			0x8001
-
-#define MSG_INVALIDATE_TLB	0x0001	/* Remote processor TLB invalidate */
-#define MSG_STOP_CPU		0x0002	/* Sent to shut down slave CPU's
-					 * when rebooting
-					 */
-#define MSG_RESCHEDULE		0x0003	/* Reschedule request from master CPU*/
-#define MSG_CALL_FUNCTION       0x0004  /* Call function on all other CPUs */
-
 /*
  * Mark the boot cpu "online" so that it can call console drivers in
  * printk() and can access its per-cpu storage.
@@ -93,6 +95,18 @@ void smp_prepare_boot_cpu(void);
 #define num_booting_cpus()			1
 #define smp_prepare_boot_cpu()			do {} while (0)
 
+static inline int on_selected_cpus(
+    cpumask_t selected,
+    void (*func) (void *info),
+    void *info,
+    int retry,
+    int wait)
+{
+    if ( cpu_isset(0, selected) )
+        func(info);
+    return 0;
+}
+
 #endif
 
 #define smp_processor_id() raw_smp_processor_id()