[S390] cpu shutdown rework
Let one master cpu kill all other cpus instead of sending an external
interrupt to all other cpus so they can kill themselves.
Simplifies reipl/shutdown functions a lot.
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/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 202bf1f..def5caf 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -1,15 +1,10 @@
/*
* arch/s390/kernel/machine_kexec.c
*
- * (C) Copyright IBM Corp. 2005
+ * Copyright IBM Corp. 2005,2006
*
- * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
- *
- */
-
-/*
- * s390_machine_kexec.c - handle the transition of Linux booting another kernel
- * on the S390 architecture.
+ * Author(s): Rolf Adelsberger,
+ * Heiko Carstens <heiko.carstens@de.ibm.com>
*/
#include <linux/device.h>
@@ -24,81 +19,53 @@
#include <asm/smp.h>
#include <asm/reset.h>
-static void kexec_halt_all_cpus(void *);
-
-typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long);
+typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
extern const unsigned char relocate_kernel[];
extern const unsigned long long relocate_kernel_len;
-int
-machine_kexec_prepare(struct kimage *image)
+int machine_kexec_prepare(struct kimage *image)
{
- unsigned long reboot_code_buffer;
+ void *reboot_code_buffer;
/* We don't support anything but the default image type for now. */
if (image->type != KEXEC_TYPE_DEFAULT)
return -EINVAL;
/* Get the destination where the assembler code should be copied to.*/
- reboot_code_buffer = page_to_pfn(image->control_code_page)<<PAGE_SHIFT;
+ reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
/* Then copy it */
- memcpy((void *) reboot_code_buffer, relocate_kernel,
- relocate_kernel_len);
+ memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
return 0;
}
-void
-machine_kexec_cleanup(struct kimage *image)
+void machine_kexec_cleanup(struct kimage *image)
{
}
-void
-machine_shutdown(void)
+void machine_shutdown(void)
{
printk(KERN_INFO "kexec: machine_shutdown called\n");
}
-NORET_TYPE void
-machine_kexec(struct kimage *image)
-{
- on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
- for (;;);
-}
-
extern void pfault_fini(void);
-static void
-kexec_halt_all_cpus(void *kernel_image)
+void machine_kexec(struct kimage *image)
{
- static atomic_t cpuid = ATOMIC_INIT(-1);
- int cpu;
- struct kimage *image;
relocate_kernel_t data_mover;
+ preempt_disable();
#ifdef CONFIG_PFAULT
if (MACHINE_IS_VM)
pfault_fini();
#endif
-
- if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
- signal_processor(smp_processor_id(), sigp_stop);
-
- /* Wait for all other cpus to enter stopped state */
- for_each_online_cpu(cpu) {
- if (cpu == smp_processor_id())
- continue;
- while (!smp_cpu_not_running(cpu))
- cpu_relax();
- }
-
+ smp_send_stop();
s390_reset_system();
- image = (struct kimage *) kernel_image;
- data_mover = (relocate_kernel_t)
- (page_to_pfn(image->control_code_page) << PAGE_SHIFT);
+ data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
/* Call the moving routine */
- (*data_mover) (&image->head, image->start);
+ (*data_mover)(&image->head, image->start);
+ for (;;);
}