X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsparc%2Fkernel%2Fsmp.c;h=40b42c88e6a7876c09598e93d30df54def747338;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=c6e721d8f4772850652034d9a97ad136fe830f38;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c
index c6e721d8f..40b42c88e 100644
--- a/arch/sparc/kernel/smp.c
+++ b/arch/sparc/kernel/smp.c
@@ -45,6 +45,7 @@ volatile int __cpu_logical_map[NR_CPUS];
 
 cpumask_t cpu_online_map = CPU_MASK_NONE;
 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 
 /* The only guaranteed locking primitive available on all Sparc
  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
@@ -57,11 +58,6 @@ cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
 /* Used to make bitops atomic */
 unsigned char bitops_spinlock = 0;
 
-volatile unsigned long ipi_count;
-
-volatile int smp_process_available=0;
-volatile int smp_commenced = 0;
-
 void __init smp_store_cpu_info(int id)
 {
 	int cpu_node;
@@ -73,12 +69,39 @@ void __init smp_store_cpu_info(int id)
 						     "clock-frequency", 0);
 	cpu_data(id).prom_node = cpu_node;
 	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
+
+	/* this is required to tune the scheduler correctly */
+	/* is it possible to have CPUs with different cache sizes? */
+	if (id == boot_cpu_id) {
+		int cache_line,cache_nlines;
+		cache_line = 0x20;
+		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
+		cache_nlines = 0x8000;
+		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
+		max_cache_size = cache_line * cache_nlines;
+	}
 	if (cpu_data(id).mid < 0)
 		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
 }
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
+	extern void smp4m_smp_done(void);
+	unsigned long bogosum = 0;
+	int cpu, num;
+
+	for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
+		if (cpu_online(cpu)) {
+			num++;
+			bogosum += cpu_data(cpu).udelay_val;
+		}
+
+	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
+		num, bogosum/(500000/HZ),
+		(bogosum/(5000/HZ))%100);
+
+	BUG_ON(sparc_cpu_model != sun4m);
+	smp4m_smp_done();
 }
 
 void cpu_panic(void)
@@ -89,17 +112,6 @@ void cpu_panic(void)
 
 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
 
-void __init smp_boot_cpus(void)
-{
-	extern void smp4m_boot_cpus(void);
-	extern void smp4d_boot_cpus(void);
-	
-	if (sparc_cpu_model == sun4m)
-		smp4m_boot_cpus();
-	else
-		smp4d_boot_cpus();
-}
-
 void smp_send_reschedule(int cpu)
 {
 	/* See sparc64 */
@@ -243,9 +255,8 @@ int setup_profiling_timer(unsigned int multiplier)
 		return -EINVAL;
 
 	spin_lock_irqsave(&prof_setup_lock, flags);
-	for(i = 0; i < NR_CPUS; i++) {
-		if (cpu_possible(i))
-			load_profile_irq(i, lvl14_resolution / multiplier);
+	for_each_possible_cpu(i) {
+		load_profile_irq(i, lvl14_resolution / multiplier);
 		prof_multiplier(i) = multiplier;
 	}
 	spin_unlock_irqrestore(&prof_setup_lock, flags);
@@ -253,33 +264,73 @@ int setup_profiling_timer(unsigned int multiplier)
 	return 0;
 }
 
-void __init smp_prepare_cpus(unsigned int maxcpus)
+void __init smp_prepare_cpus(unsigned int max_cpus)
 {
+	extern void smp4m_boot_cpus(void);
+	int i, cpuid, ncpus, extra;
+
+	BUG_ON(sparc_cpu_model != sun4m);
+	printk("Entering SMP Mode...\n");
+
+	ncpus = 1;
+	extra = 0;
+	for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
+		if (cpuid == boot_cpu_id)
+			continue;
+		if (cpuid < NR_CPUS && ncpus++ < max_cpus)
+			cpu_set(cpuid, phys_cpu_present_map);
+		else
+			extra++;
+	}
+	if (max_cpus >= NR_CPUS && extra)
+		printk("Warning: NR_CPUS is too low to start all cpus\n");
+
+	smp_store_cpu_info(boot_cpu_id);
+
+	smp4m_boot_cpus();
 }
 
 void __devinit smp_prepare_boot_cpu(void)
 {
-	current_thread_info()->cpu = hard_smp_processor_id();
-	cpu_set(smp_processor_id(), cpu_online_map);
-	cpu_set(smp_processor_id(), phys_cpu_present_map);
+	int cpuid = hard_smp_processor_id();
+
+	if (cpuid >= NR_CPUS) {
+		prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
+		prom_halt();
+	}
+	if (cpuid != 0)
+		printk("boot cpu id != 0, this could work but is untested\n");
+
+	current_thread_info()->cpu = cpuid;
+	cpu_set(cpuid, cpu_online_map);
+	cpu_set(cpuid, phys_cpu_present_map);
 }
 
 int __devinit __cpu_up(unsigned int cpu)
 {
-	panic("smp doesn't work\n");
+	extern int smp4m_boot_one_cpu(int);
+	int ret;
+
+	ret = smp4m_boot_one_cpu(cpu);
+
+	if (!ret) {
+		cpu_set(cpu, smp_commenced_mask);
+		while (!cpu_online(cpu))
+			mb();
+	}
+	return ret;
 }
 
 void smp_bogo(struct seq_file *m)
 {
 	int i;
 	
-	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_online(i))
-			seq_printf(m,
-				   "Cpu%dBogo\t: %lu.%02lu\n", 
-				   i,
-				   cpu_data(i).udelay_val/(500000/HZ),
-				   (cpu_data(i).udelay_val/(5000/HZ))%100);
+	for_each_online_cpu(i) {
+		seq_printf(m,
+			   "Cpu%dBogo\t: %lu.%02lu\n",
+			   i,
+			   cpu_data(i).udelay_val/(500000/HZ),
+			   (cpu_data(i).udelay_val/(5000/HZ))%100);
 	}
 }
 
@@ -288,8 +339,6 @@ void smp_info(struct seq_file *m)
 	int i;
 
 	seq_printf(m, "State:\n");
-	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_online(i))
-			seq_printf(m, "CPU%d\t\t: online\n", i);
-	}
+	for_each_online_cpu(i)
+		seq_printf(m, "CPU%d\t\t: online\n", i);
 }