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authorSven Schnelle <svens@stackframe.org>2019-09-08 11:33:03 +0200
committerHelge Deller <deller@gmx.de>2019-09-08 15:19:58 +0200
commit507efd63d98c4437d62bbfa932b322e72723e1fc (patch)
tree6c9d7283f37f68b9153e0025b1703fa01b69d820 /arch/parisc
parent08e697808f6823fa5dc833a344700f60b25a59d4 (diff)
downloadlinux-507efd63d98c4437d62bbfa932b322e72723e1fc.tar.bz2
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>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/include/asm/pdc.h1
-rw-r--r--arch/parisc/kernel/firmware.c13
-rw-r--r--arch/parisc/kernel/smp.c1
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h
index 19bb2e46cd36..b388d8176588 100644
--- 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 58cc08e7fd12..1d976f2ebff0 100644
--- 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 cbd074ba22da..e202c37e56af 100644
--- 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 (;;)
;
}