[S390] Get rid of additional_cpus kernel parameter.
It caused only a lot of confusion. From now on cpu hotplug of up to
NR_CPUS will work by default. If somebody wants to limit that then
the possible_cpus parameter can be used.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 66fe289..320e4e9 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -54,7 +54,7 @@
cpumask_t cpu_online_map = CPU_MASK_NONE;
EXPORT_SYMBOL(cpu_online_map);
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
+cpumask_t cpu_possible_map = CPU_MASK_ALL;
EXPORT_SYMBOL(cpu_possible_map);
static struct task_struct *current_set[NR_CPUS];
@@ -399,7 +399,7 @@
"kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS);
return;
}
- zfcpdump_save_areas[cpu] = alloc_bootmem(sizeof(union save_area));
+ zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL);
__cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu;
while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) ==
sigp_busy)
@@ -435,67 +435,6 @@
return 0;
}
-/*
- * Lets check how many CPUs we have.
- */
-static void __init smp_count_cpus(unsigned int *configured_cpus,
- unsigned int *standby_cpus)
-{
- unsigned int cpu;
- struct sclp_cpu_info *info;
- u16 boot_cpu_addr, cpu_addr;
-
- boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
- current_thread_info()->cpu = 0;
- *configured_cpus = 1;
- *standby_cpus = 0;
-
- info = alloc_bootmem_pages(sizeof(*info));
- if (!info)
- disabled_wait((unsigned long) __builtin_return_address(0));
-
- /* Use sigp detection algorithm if sclp doesn't work. */
- if (sclp_get_cpu_info(info)) {
- smp_use_sigp_detection = 1;
- for (cpu = 0; cpu <= 65535; cpu++) {
- if (cpu == boot_cpu_addr)
- continue;
- __cpu_logical_map[CPU_INIT_NO] = cpu;
- if (cpu_stopped(CPU_INIT_NO))
- (*configured_cpus)++;
- }
- goto out;
- }
-
- if (info->has_cpu_type) {
- for (cpu = 0; cpu < info->combined; cpu++) {
- if (info->cpu[cpu].address == boot_cpu_addr) {
- smp_cpu_type = info->cpu[cpu].type;
- break;
- }
- }
- }
- /* Count cpus. */
- for (cpu = 0; cpu < info->combined; cpu++) {
- if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
- continue;
- cpu_addr = info->cpu[cpu].address;
- if (cpu_addr == boot_cpu_addr)
- continue;
- __cpu_logical_map[CPU_INIT_NO] = cpu_addr;
- if (!cpu_stopped(CPU_INIT_NO)) {
- (*standby_cpus)++;
- continue;
- }
- smp_get_save_area(*configured_cpus, cpu_addr);
- (*configured_cpus)++;
- }
-out:
- printk(KERN_INFO "CPUs: %d configured, %d standby\n",
- *configured_cpus, *standby_cpus);
- free_bootmem((unsigned long) info, sizeof(*info));
-}
-
static int cpu_known(int cpu_id)
{
int cpu;
@@ -529,7 +468,7 @@
return 0;
}
-static int __init_refok smp_rescan_cpus_sclp(cpumask_t avail)
+static int smp_rescan_cpus_sclp(cpumask_t avail)
{
struct sclp_cpu_info *info;
int cpu_id, logical_cpu, cpu;
@@ -538,10 +477,7 @@
logical_cpu = first_cpu(avail);
if (logical_cpu == NR_CPUS)
return 0;
- if (slab_is_available())
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- else
- info = alloc_bootmem(sizeof(*info));
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
rc = sclp_get_cpu_info(info);
@@ -564,10 +500,7 @@
break;
}
out:
- if (slab_is_available())
- kfree(info);
- else
- free_bootmem((unsigned long) info, sizeof(*info));
+ kfree(info);
return rc;
}
@@ -575,15 +508,71 @@
{
cpumask_t avail;
- cpus_setall(avail);
- cpus_and(avail, avail, cpu_possible_map);
- cpus_andnot(avail, avail, cpu_present_map);
+ cpus_xor(avail, cpu_possible_map, cpu_present_map);
if (smp_use_sigp_detection)
return smp_rescan_cpus_sigp(avail);
else
return smp_rescan_cpus_sclp(avail);
}
+static void __init smp_detect_cpus(void)
+{
+ unsigned int cpu, c_cpus, s_cpus;
+ struct sclp_cpu_info *info;
+ u16 boot_cpu_addr, cpu_addr;
+
+ c_cpus = 1;
+ s_cpus = 0;
+ boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ panic("smp_detect_cpus failed to allocate memory\n");
+ /* Use sigp detection algorithm if sclp doesn't work. */
+ if (sclp_get_cpu_info(info)) {
+ smp_use_sigp_detection = 1;
+ for (cpu = 0; cpu <= 65535; cpu++) {
+ if (cpu == boot_cpu_addr)
+ continue;
+ __cpu_logical_map[CPU_INIT_NO] = cpu;
+ if (!cpu_stopped(CPU_INIT_NO))
+ continue;
+ smp_get_save_area(c_cpus, cpu);
+ c_cpus++;
+ }
+ goto out;
+ }
+
+ if (info->has_cpu_type) {
+ for (cpu = 0; cpu < info->combined; cpu++) {
+ if (info->cpu[cpu].address == boot_cpu_addr) {
+ smp_cpu_type = info->cpu[cpu].type;
+ break;
+ }
+ }
+ }
+
+ for (cpu = 0; cpu < info->combined; cpu++) {
+ if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
+ continue;
+ cpu_addr = info->cpu[cpu].address;
+ if (cpu_addr == boot_cpu_addr)
+ continue;
+ __cpu_logical_map[CPU_INIT_NO] = cpu_addr;
+ if (!cpu_stopped(CPU_INIT_NO)) {
+ s_cpus++;
+ continue;
+ }
+ smp_get_save_area(c_cpus, cpu_addr);
+ c_cpus++;
+ }
+out:
+ kfree(info);
+ printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
+ lock_cpu_hotplug();
+ smp_rescan_cpus();
+ unlock_cpu_hotplug();
+}
+
/*
* Activate a secondary processor.
*/
@@ -674,41 +663,20 @@
return 0;
}
-static unsigned int __initdata additional_cpus;
-static unsigned int __initdata possible_cpus;
-
-void __init smp_setup_cpu_possible_map(void)
-{
- unsigned int pos_cpus, cpu;
- unsigned int configured_cpus, standby_cpus;
-
- smp_count_cpus(&configured_cpus, &standby_cpus);
- pos_cpus = min(configured_cpus + standby_cpus + additional_cpus,
- (unsigned int) NR_CPUS);
- if (possible_cpus)
- pos_cpus = min(possible_cpus, (unsigned int) NR_CPUS);
- for (cpu = 0; cpu < pos_cpus; cpu++)
- cpu_set(cpu, cpu_possible_map);
- cpu_present_map = cpumask_of_cpu(0);
- smp_rescan_cpus();
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-
-static int __init setup_additional_cpus(char *s)
-{
- additional_cpus = simple_strtoul(s, NULL, 0);
- return 0;
-}
-early_param("additional_cpus", setup_additional_cpus);
-
static int __init setup_possible_cpus(char *s)
{
- possible_cpus = simple_strtoul(s, NULL, 0);
+ int pcpus, cpu;
+
+ pcpus = simple_strtoul(s, NULL, 0);
+ cpu_possible_map = cpumask_of_cpu(0);
+ for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++)
+ cpu_set(cpu, cpu_possible_map);
return 0;
}
early_param("possible_cpus", setup_possible_cpus);
+#ifdef CONFIG_HOTPLUG_CPU
+
int __cpu_disable(void)
{
struct ec_creg_mask_parms cr_parms;
@@ -768,6 +736,8 @@
unsigned int cpu;
int i;
+ smp_detect_cpus();
+
/* request the 0x1201 emergency signal external interrupt */
if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
panic("Couldn't request external interrupt 0x1201");
@@ -816,6 +786,8 @@
{
BUG_ON(smp_processor_id() != 0);
+ current_thread_info()->cpu = 0;
+ cpu_set(0, cpu_present_map);
cpu_set(0, cpu_online_map);
S390_lowcore.percpu_offset = __per_cpu_offset[0];
current_set[0] = current;