[Xen-devel] [PATCH V3 2/2] xen/arm: Use PSCI-0.2 for machine_halt/restart by default

[<suravee.suthikulpanit@xxxxxxx>]

From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>

"machine_halt()" and "machine_restart()" are modified to use PSCI interface
by default if PSCI-0.2 is supported. The "raw_machine_reset()" is also removed
since this is unnecessary.

Also, machine_halt() is modified to add 10ms delay to make sure all auxiliary 
CPUs
are offlined before calling the shutdown.

For non-PSCI, platform_poweroff() and platform_reset() are used instead.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
---
 xen/arch/arm/shutdown.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/xen/arch/arm/shutdown.c b/xen/arch/arm/shutdown.c
index adc0529..4988b03 100644
--- a/xen/arch/arm/shutdown.c
+++ b/xen/arch/arm/shutdown.c
@@ -5,11 +5,7 @@
 #include <xen/lib.h>
 #include <xen/smp.h>
 #include <asm/platform.h>
-
-static void raw_machine_reset(void)
-{
-    platform_reset();
-}
+#include <asm/psci.h>
 
 static void noreturn halt_this_cpu(void *arg)
 {
@@ -18,10 +14,23 @@ static void noreturn halt_this_cpu(void *arg)
 
 void machine_halt(void)
 {
+    int timeout = 10;
+
     watchdog_disable();
     console_start_sync();
     local_irq_enable();
     smp_call_function(halt_this_cpu, NULL, 0);
+    local_irq_disable();
+
+    /* Wait at most another 10ms for all other CPUs to go offline. */
+    while ( (num_online_cpus() > 1) && (timeout-- > 0) )
+        mdelay(1);
+
+    /* This is mainly for PSCI-0.2, which does not return if success. */
+    call_psci_system_off();
+
+    /* Alternative halt procedure */
+    platform_poweroff();
     halt_this_cpu(NULL);
 }
 
@@ -39,9 +48,13 @@ void machine_restart(unsigned int delay_millisecs)
     while ( (num_online_cpus() > 1) && (timeout-- > 0) )
         mdelay(1);
 
+    /* This is mainly for PSCI-0.2, which does not return if success. */
+    call_psci_system_reset();
+
+    /* Alternative reset procedure */
     while ( 1 )
     {
-        raw_machine_reset();
+        platform_reset();
         mdelay(100);
     }
 }
-- 
1.9.3


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