[Xen-devel] [PATCH 3/6] xen: add new cpu notifier action CPU_RESUME_FAILED

[Juergen Gross <jgross@xxxxxxxx>]

Add a new cpu notifier action CPU_RESUME_FAILED which is called for all
cpus which failed to come up at resume. The calls will be done after
all other cpus are already up.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/common/cpu.c      |  5 +++++
 xen/include/xen/cpu.h | 20 +++++++++++---------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/xen/common/cpu.c b/xen/common/cpu.c
index c436c0de7f..f3cf9463b4 100644
--- a/xen/common/cpu.c
+++ b/xen/common/cpu.c
@@ -214,7 +214,12 @@ void enable_nonboot_cpus(void)
             printk("Error bringing CPU%d up: %d\n", cpu, error);
             BUG_ON(error == -EBUSY);
         }
+        else
+            __cpumask_clear_cpu(cpu, &frozen_cpus);
     }
 
+    for_each_cpu ( cpu, &frozen_cpus )
+        BUG_ON(cpu_notifier_call_chain(cpu, CPU_RESUME_FAILED, NULL));
+
     cpumask_clear(&frozen_cpus);
 }
diff --git a/xen/include/xen/cpu.h b/xen/include/xen/cpu.h
index 2fe3ec05d8..2fc0cb1bb5 100644
--- a/xen/include/xen/cpu.h
+++ b/xen/include/xen/cpu.h
@@ -32,23 +32,25 @@ void register_cpu_notifier(struct notifier_block *nb);
  *  (a) A CPU is going down; or (b) CPU_UP_CANCELED
  */
 /* CPU_UP_PREPARE: Preparing to bring CPU online. */
-#define CPU_UP_PREPARE   (0x0001 | NOTIFY_FORWARD)
+#define CPU_UP_PREPARE    (0x0001 | NOTIFY_FORWARD)
 /* CPU_UP_CANCELED: CPU is no longer being brought online. */
-#define CPU_UP_CANCELED  (0x0002 | NOTIFY_REVERSE)
+#define CPU_UP_CANCELED   (0x0002 | NOTIFY_REVERSE)
 /* CPU_STARTING: CPU nearly online. Runs on new CPU, irqs still disabled. */
-#define CPU_STARTING     (0x0003 | NOTIFY_FORWARD)
+#define CPU_STARTING      (0x0003 | NOTIFY_FORWARD)
 /* CPU_ONLINE: CPU is up. */
-#define CPU_ONLINE       (0x0004 | NOTIFY_FORWARD)
+#define CPU_ONLINE        (0x0004 | NOTIFY_FORWARD)
 /* CPU_DOWN_PREPARE: CPU is going down. */
-#define CPU_DOWN_PREPARE (0x0005 | NOTIFY_REVERSE)
+#define CPU_DOWN_PREPARE  (0x0005 | NOTIFY_REVERSE)
 /* CPU_DOWN_FAILED: CPU is no longer going down. */
-#define CPU_DOWN_FAILED  (0x0006 | NOTIFY_FORWARD)
+#define CPU_DOWN_FAILED   (0x0006 | NOTIFY_FORWARD)
 /* CPU_DYING: CPU is nearly dead (in stop_machine context). */
-#define CPU_DYING        (0x0007 | NOTIFY_REVERSE)
+#define CPU_DYING         (0x0007 | NOTIFY_REVERSE)
 /* CPU_DEAD: CPU is dead. */
-#define CPU_DEAD         (0x0008 | NOTIFY_REVERSE)
+#define CPU_DEAD          (0x0008 | NOTIFY_REVERSE)
 /* CPU_REMOVE: CPU was removed. */
-#define CPU_REMOVE       (0x0009 | NOTIFY_REVERSE)
+#define CPU_REMOVE        (0x0009 | NOTIFY_REVERSE)
+/* CPU_RESUME_FAILED: CPU failed to come up in resume, all other CPUs up. */
+#define CPU_RESUME_FAILED (0x000a | NOTIFY_REVERSE)
 
 /* Perform CPU hotplug. May return -EAGAIN. */
 int cpu_down(unsigned int cpu);
-- 
2.16.4


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