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[S390] Clean up smp code in preparation for some larger changes.

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Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens
2007-04-27 16:02:00 +02:00
committed by Martin Schwidefsky
parent 9ff6f4577e
commit 39ce010d38
2 changed files with 99 additions and 165 deletions
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121
arch/s390/kernel/smp.c
View File

@@ -1,7 +1,7 @@
/*
* arch/s390/kernel/smp.c
*
* Copyright (C) IBM Corp. 1999,2006
* Copyright IBM Corp. 1999,2007
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
* Heiko Carstens (heiko.carstens@de.ibm.com)
@@ -43,16 +43,17 @@
#include <asm/timer.h>
#include <asm/lowcore.h>
extern volatile int __cpu_logical_map[];
/*
* An array with a pointer the lowcore of every CPU.
*/
struct _lowcore *lowcore_ptr[NR_CPUS];
EXPORT_SYMBOL(lowcore_ptr);
cpumask_t cpu_online_map = CPU_MASK_NONE;
EXPORT_SYMBOL(cpu_online_map);
cpumask_t cpu_possible_map = CPU_MASK_NONE;
EXPORT_SYMBOL(cpu_possible_map);
static struct task_struct *current_set[NR_CPUS];
@@ -152,8 +153,8 @@ out:
*
* Run a function on all other CPUs.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler. You may call it from a bottom half.
* You must not call this function with disabled interrupts, from a
* hardware interrupt handler or from a bottom half.
*/
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
int wait)
@@ -179,8 +180,8 @@ EXPORT_SYMBOL(smp_call_function);
*
* Run a function on one processor.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler. You may call it from a bottom half.
* You must not call this function with disabled interrupts, from a
* hardware interrupt handler or from a bottom half.
*/
int smp_call_function_on(void (*func) (void *info), void *info, int nonatomic,
int wait, int cpu)
@@ -263,7 +264,6 @@ void smp_send_stop(void)
/*
* Reboot, halt and power_off routines for SMP.
*/
void machine_restart_smp(char *__unused)
{
smp_send_stop();
@@ -360,7 +360,8 @@ struct ec_creg_mask_parms {
/*
* callback for setting/clearing control bits
*/
static void smp_ctl_bit_callback(void *info) {
static void smp_ctl_bit_callback(void *info)
{
struct ec_creg_mask_parms *pp = info;
unsigned long cregs[16];
int i;
@@ -383,6 +384,7 @@ void smp_ctl_set_bit(int cr, int bit)
parms.orvals[cr] = 1 << bit;
on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
}
EXPORT_SYMBOL(smp_ctl_set_bit);
/*
* Clear a bit in a control register of all cpus
@@ -396,6 +398,7 @@ void smp_ctl_clear_bit(int cr, int bit)
parms.andvals[cr] = ~(1L << bit);
on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
}
EXPORT_SYMBOL(smp_ctl_clear_bit);
#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
@@ -460,8 +463,7 @@ EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
* Lets check how many CPUs we have.
*/
static unsigned int
__init smp_count_cpus(void)
static unsigned int __init smp_count_cpus(void)
{
unsigned int cpu, num_cpus;
__u16 boot_cpu_addr;
@@ -477,8 +479,7 @@ __init smp_count_cpus(void)
if ((__u16) cpu == boot_cpu_addr)
continue;
__cpu_logical_map[1] = (__u16) cpu;
if (signal_processor(1, sigp_sense) ==
sigp_not_operational)
if (signal_processor(1, sigp_sense) == sigp_not_operational)
continue;
num_cpus++;
}
@@ -531,56 +532,13 @@ static void __init smp_create_idle(unsigned int cpu)
current_set[cpu] = p;
}
/* Reserving and releasing of CPUs */
static DEFINE_SPINLOCK(smp_reserve_lock);
static int smp_cpu_reserved[NR_CPUS];
int
smp_get_cpu(cpumask_t cpu_mask)
{
unsigned long flags;
int cpu;
spin_lock_irqsave(&smp_reserve_lock, flags);
/* Try to find an already reserved cpu. */
for_each_cpu_mask(cpu, cpu_mask) {
if (smp_cpu_reserved[cpu] != 0) {
smp_cpu_reserved[cpu]++;
/* Found one. */
goto out;
}
}
/* Reserve a new cpu from cpu_mask. */
for_each_cpu_mask(cpu, cpu_mask) {
if (cpu_online(cpu)) {
smp_cpu_reserved[cpu]++;
goto out;
}
}
cpu = -ENODEV;
out:
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return cpu;
}
void
smp_put_cpu(int cpu)
{
unsigned long flags;
spin_lock_irqsave(&smp_reserve_lock, flags);
smp_cpu_reserved[cpu]--;
spin_unlock_irqrestore(&smp_reserve_lock, flags);
}
static int
cpu_stopped(int cpu)
static int cpu_stopped(int cpu)
{
__u32 status;
/* Check for stopped state */
if (signal_processor_ps(&status, 0, cpu, sigp_sense) == sigp_status_stored) {
if (signal_processor_ps(&status, 0, cpu, sigp_sense) ==
sigp_status_stored) {
if (status & 0x40)
return 1;
}
@@ -589,8 +547,7 @@ cpu_stopped(int cpu)
/* Upping and downing of CPUs */
int
__cpu_up(unsigned int cpu)
int __cpu_up(unsigned int cpu)
{
struct task_struct *idle;
struct _lowcore *cpu_lowcore;
@@ -619,7 +576,7 @@ __cpu_up(unsigned int cpu)
idle = current_set[cpu];
cpu_lowcore = lowcore_ptr[cpu];
cpu_lowcore->kernel_stack = (unsigned long)
task_stack_page(idle) + (THREAD_SIZE);
task_stack_page(idle) + THREAD_SIZE;
sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
- sizeof(struct pt_regs)
- sizeof(struct stack_frame));
@@ -682,18 +639,11 @@ static int __init setup_possible_cpus(char *s)
}
early_param("possible_cpus", setup_possible_cpus);
int
__cpu_disable(void)
int __cpu_disable(void)
{
unsigned long flags;
struct ec_creg_mask_parms cr_parms;
int cpu = smp_processor_id();
spin_lock_irqsave(&smp_reserve_lock, flags);
if (smp_cpu_reserved[cpu] != 0) {
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return -EBUSY;
}
cpu_clear(cpu, cpu_online_map);
/* Disable pfault pseudo page faults on this cpu. */
@@ -712,16 +662,15 @@ __cpu_disable(void)
1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
/* disable most machine checks */
cr_parms.orvals[14] = 0;
cr_parms.andvals[14] = ~(1<<28 | 1<<27 | 1<<26 | 1<<25 | 1<<24);
cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
1 << 25 | 1 << 24);
smp_ctl_bit_callback(&cr_parms);
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return 0;
}
void
__cpu_die(unsigned int cpu)
void __cpu_die(unsigned int cpu)
{
/* Wait until target cpu is down */
while (!smp_cpu_not_running(cpu))
@@ -729,8 +678,7 @@ __cpu_die(unsigned int cpu)
printk("Processor %d spun down\n", cpu);
}
void
cpu_die(void)
void cpu_die(void)
{
idle_task_exit();
signal_processor(smp_processor_id(), sigp_stop);
@@ -764,20 +712,20 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
__get_free_pages(GFP_KERNEL | GFP_DMA,
sizeof(void*) == 8 ? 1 : 0);
stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
if (lowcore_ptr[i] == NULL || stack == 0ULL)
if (!lowcore_ptr[i] || !stack)
panic("smp_boot_cpus failed to allocate memory\n");
*(lowcore_ptr[i]) = S390_lowcore;
lowcore_ptr[i]->async_stack = stack + (ASYNC_SIZE);
lowcore_ptr[i]->async_stack = stack + ASYNC_SIZE;
stack = __get_free_pages(GFP_KERNEL, 0);
if (stack == 0ULL)
if (!stack)
panic("smp_boot_cpus failed to allocate memory\n");
lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE);
lowcore_ptr[i]->panic_stack = stack + PAGE_SIZE;
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lowcore_ptr[i]->extended_save_area_addr =
(__u32) __get_free_pages(GFP_KERNEL, 0);
if (lowcore_ptr[i]->extended_save_area_addr == 0)
if (!lowcore_ptr[i]->extended_save_area_addr)
panic("smp_boot_cpus failed to "
"allocate memory\n");
}
@@ -875,13 +823,4 @@ static int __init topology_init(void)
}
return 0;
}
subsys_initcall(topology_init);
EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_possible_map);
EXPORT_SYMBOL(lowcore_ptr);
EXPORT_SYMBOL(smp_ctl_set_bit);
EXPORT_SYMBOL(smp_ctl_clear_bit);
EXPORT_SYMBOL(smp_get_cpu);
EXPORT_SYMBOL(smp_put_cpu);

5
include/asm-s390/smp.h
View File

@@ -54,9 +54,6 @@ extern int smp_call_function_on(void (*func) (void *info), void *info,
#define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr)
extern int smp_get_cpu(cpumask_t cpu_map);
extern void smp_put_cpu(int cpu);
static inline __u16 hard_smp_processor_id(void)
{
__u16 cpu_address;
@@ -114,8 +111,6 @@ static inline void smp_send_stop(void)
}
#define smp_cpu_not_running(cpu) 1
#define smp_get_cpu(cpu) ({ 0; })
#define smp_put_cpu(cpu) ({ 0; })
#define smp_setup_cpu_possible_map() do { } while (0)
#endif