parisc: add __pdc_cpu_rendezvous()

When stopping SMP cpus send them into rendezvous, so we can
start them again later (when kexec'ing a new kernel).

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h
index 19bb2e4..b388d81 100644 (file)
--- a/arch/parisc/include/asm/pdc.h
+++ b/arch/parisc/include/asm/pdc.h
@@ -91,6 +91,7 @@ int pdc_sti_call(unsigned long func, unsigned long flags,
                  unsigned long inptr, unsigned long outputr,
                  unsigned long glob_cfg);
 
+int __pdc_cpu_rendezvous(void);
 static inline char * os_id_to_string(u16 os_id) {
        switch(os_id) {
        case OS_ID_NONE:        return "No OS";

diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index 58cc08e..1d976f2 100644 (file)
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -312,6 +312,19 @@ int pdc_chassis_disp(unsigned long disp)
 }
 
 /**
+ * pdc_cpu_rendenzvous - Stop currently executing CPU
+ * @retval: -1 on error, 0 on success
+ */
+int __pdc_cpu_rendezvous(void)
+{
+       if (is_pdc_pat())
+               return mem_pdc_call(PDC_PAT_CPU, PDC_PAT_CPU_RENDEZVOUS);
+       else
+               return mem_pdc_call(PDC_PROC, 1, 0);
+}
+
+
+/**
  * pdc_chassis_warn - Fetches chassis warnings
  * @retval: -1 on error, 0 on success
  */

diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index cbd074b..e202c37 100644 (file)
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -109,6 +109,7 @@ halt_processor(void)
        /* REVISIT : does PM *know* this CPU isn't available? */
        set_cpu_online(smp_processor_id(), false);
        local_irq_disable();
+       __pdc_cpu_rendezvous();
        for (;;)
                ;
 }