---

yaml --- r: 3230 b: refs/heads/master c: 67664c8 h: refs/heads/master v: v3
git-mirror · Jun 25, 2005 · 7cb0fa9 · 7cb0fa9
1 parent ec18be7
commit 7cb0fa9
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Showing 3 changed files with 53 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f370513640492641b4046bfd9a6e4714f6ae530d
+refs/heads/master: 67664c8f7e74def5adf66298a1245d82af72db2c
diff --git a/trunk/arch/i386/mach-default/setup.c b/trunk/arch/i386/mach-default/setup.c
@@ -10,6 +10,14 @@
 #include <asm/acpi.h>
 #include <asm/arch_hooks.h>
 
+#ifdef CONFIG_HOTPLUG_CPU
+#define DEFAULT_SEND_IPI	(1)
+#else
+#define DEFAULT_SEND_IPI	(0)
+#endif
+
+int no_broadcast=DEFAULT_SEND_IPI;
+
 /**
  * pre_intr_init_hook - initialisation prior to setting up interrupt vectors
  *
@@ -104,3 +112,22 @@ void __init mca_nmi_hook(void)
 	printk("NMI generated from unknown source!\n");
 }
 #endif
+
+static __init int no_ipi_broadcast(char *str)
+{
+	get_option(&str, &no_broadcast);
+	printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
+											"IPI Broadcast");
+	return 1;
+}
+
+__setup("no_ipi_broadcast", no_ipi_broadcast);
+
+static int __init print_ipi_mode(void)
+{
+	printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
+											"Shortcut");
+	return 0;
+}
+
+late_initcall(print_ipi_mode);
diff --git a/trunk/include/asm-i386/mach-default/mach_ipi.h b/trunk/include/asm-i386/mach-default/mach_ipi.h
@@ -4,11 +4,34 @@
 void send_IPI_mask_bitmask(cpumask_t mask, int vector);
 void __send_IPI_shortcut(unsigned int shortcut, int vector);
 
+extern int no_broadcast;
+
 static inline void send_IPI_mask(cpumask_t mask, int vector)
 {
 	send_IPI_mask_bitmask(mask, vector);
 }
 
+static inline void __local_send_IPI_allbutself(int vector)
+{
+	if (no_broadcast) {
+		cpumask_t mask = cpu_online_map;
+		int this_cpu = get_cpu();
+
+		cpu_clear(this_cpu, mask);
+		send_IPI_mask(mask, vector);
+		put_cpu();
+	} else
+		__send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
+}
+
+static inline void __local_send_IPI_all(int vector)
+{
+	if (no_broadcast)
+		send_IPI_mask(cpu_online_map, vector);
+	else
+		__send_IPI_shortcut(APIC_DEST_ALLINC, vector);
+}
+
 static inline void send_IPI_allbutself(int vector)
 {
 	/*
@@ -18,13 +41,13 @@ static inline void send_IPI_allbutself(int vector)
 	if (!(num_online_cpus() > 1))
 		return;
 
-	__send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
+	__local_send_IPI_allbutself(vector);
 	return;
 }
 
 static inline void send_IPI_all(int vector)
 {
-	__send_IPI_shortcut(APIC_DEST_ALLINC, vector);
+	__local_send_IPI_all(vector);
 }
 
 #endif /* __ASM_MACH_IPI_H */