[SPARC64]: Export basic cpu properties via sysfs.

Cache sizes, udelay_val, and clock_tick.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/sysfs.c

@@ -10,14 +10,100 @@
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
+#define SHOW_ULONG_NAME(NAME, MEMBER) \
+static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
+{ \
+	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
+	cpuinfo_sparc *c = &cpu_data(cpu->sysdev.id); \
+	return sprintf(buf, "%lu\n", c->MEMBER); \
+}
+
+#define SHOW_UINT_NAME(NAME, MEMBER) \
+static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
+{ \
+	struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
+	cpuinfo_sparc *c = &cpu_data(cpu->sysdev.id); \
+	return sprintf(buf, "%u\n", c->MEMBER); \
+}
+
+SHOW_ULONG_NAME(clock_tick, clock_tick);
+SHOW_ULONG_NAME(udelay_val, udelay_val);
+SHOW_UINT_NAME(l1_dcache_size, dcache_size);
+SHOW_UINT_NAME(l1_dcache_line_size, dcache_line_size);
+SHOW_UINT_NAME(l1_icache_size, icache_size);
+SHOW_UINT_NAME(l1_icache_line_size, icache_line_size);
+SHOW_UINT_NAME(l2_cache_size, ecache_size);
+SHOW_UINT_NAME(l2_cache_line_size, ecache_line_size);
+
+static struct sysdev_attribute cpu_core_attrs[] = {
+	_SYSDEV_ATTR(clock_tick,          0444, show_clock_tick, NULL),
+	_SYSDEV_ATTR(udelay_val,          0444, show_udelay_val, NULL),
+	_SYSDEV_ATTR(l1_dcache_size,      0444, show_l1_dcache_size, NULL),
+	_SYSDEV_ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
+	_SYSDEV_ATTR(l1_icache_size,      0444, show_l1_icache_size, NULL),
+	_SYSDEV_ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
+	_SYSDEV_ATTR(l2_cache_size,       0444, show_l2_cache_size, NULL),
+	_SYSDEV_ATTR(l2_cache_line_size,  0444, show_l2_cache_line_size, NULL),
+};
+
+static void register_cpu_online(unsigned int cpu)
+{
+	struct cpu *c = &per_cpu(cpu_devices, cpu);
+	struct sys_device *s = &c->sysdev;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
+		sysdev_create_file(s, &cpu_core_attrs[i]);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void unregister_cpu_online(unsigned int cpu)
+{
+	struct cpu *c = &per_cpu(cpu_devices, cpu);
+	struct sys_device *s = &c->sysdev;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
+		sysdev_remove_file(s, &cpu_core_attrs[i]);
+}
+#endif
+
+static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
+				      unsigned long action, void *hcpu)
+{
+	unsigned int cpu = (unsigned int)(long)hcpu;
+
+	switch (action) {
+	case CPU_ONLINE:
+	case CPU_ONLINE_FROZEN:
+		register_cpu_online(cpu);
+		break;
+#ifdef CONFIG_HOTPLUG_CPU
+	case CPU_DEAD:
+	case CPU_DEAD_FROZEN:
+		unregister_cpu_online(cpu);
+		break;
+#endif
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
+	.notifier_call	= sysfs_cpu_notify,
+};
+
 static int __init topology_init(void)
 {
 	int cpu;
 
+	register_cpu_notifier(&sysfs_cpu_nb);
+
 	for_each_possible_cpu(cpu) {
 		struct cpu *c = &per_cpu(cpu_devices, cpu);
 
 		register_cpu(c, cpu);
+		if (cpu_online(cpu))
+			register_cpu_online(cpu);
 	}
 
 	return 0;