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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>
alistair/sunxi64-5.4-dsi
Sven Schnelle 2019-09-08 11:33:03 +02:00 committed by Helge Deller
parent 08e697808f
commit 507efd63d9
3 changed files with 15 additions and 0 deletions
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1
arch/parisc/include/asm/pdc.h
View File

@ -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";

13
arch/parisc/kernel/firmware.c
View File

@ -311,6 +311,19 @@ int pdc_chassis_disp(unsigned long disp)
return retval;
}
/**
* 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

1
arch/parisc/kernel/smp.c
View File

@ -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 (;;)
;
}