powerpc/kexec: make masking/disabling interrupts generic

Right now just the kexec crash pathway turns turns off the interrupts.
Pull that out and make a generic version for use elsewhere

Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

4 files changed, 30 insertions, 12 deletions

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 076327f2eff7..f54408d995b5 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -91,6 +91,7 @@ extern void machine_kexec_simple(struct kimage *image);
 extern void crash_kexec_secondary(struct pt_regs *regs);
 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
 extern void reserve_crashkernel(void);
+extern void machine_kexec_mask_interrupts(void);
 
 #else /* !CONFIG_KEXEC */
 static inline int kexec_sr_activated(int cpu) { return 0; }
diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index 4457382f8667..832c8c4db254 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -414,18 +414,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
         crash_kexec_wait_realmode(crashing_cpu);
 #endif
 
-        for_each_irq(i) {
-                struct irq_desc *desc = irq_to_desc(i);
-
-                if (!desc || !desc->chip || !desc->chip->eoi)
-                        continue;
-
-                if (desc->status & IRQ_INPROGRESS)
-                        desc->chip->eoi(i);
-
-                if (!(desc->status & IRQ_DISABLED))
-                        desc->chip->shutdown(i);
-        }
+        machine_kexec_mask_interrupts();
 
         /*
          * Call registered shutdown routines savely.  Swap out
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index dd6c141f1662..df7e20c191cd 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -14,10 +14,34 @@
 #include <linux/threads.h>
 #include <linux/memblock.h>
 #include <linux/of.h>
+#include <linux/irq.h>
+
 #include <asm/machdep.h>
 #include <asm/prom.h>
 #include <asm/sections.h>
 
+void machine_kexec_mask_interrupts(void) {
+        unsigned int i;
+
+        for_each_irq(i) {
+                struct irq_desc *desc = irq_to_desc(i);
+
+                if (!desc || !desc->chip)
+                        continue;
+
+                if (desc->chip->eoi &&
+                    desc->status & IRQ_INPROGRESS)
+                        desc->chip->eoi(i);
+
+                if (desc->chip->mask)
+                        desc->chip->mask(i);
+
+                if (desc->chip->disable &&
+                    !(desc->status & IRQ_DISABLED))
+                        desc->chip->disable(i);
+        }
+}
+
 void machine_crash_shutdown(struct pt_regs *regs)
 {
         if (ppc_md.machine_crash_shutdown)
diff --git a/arch/powerpc/kernel/machine_kexec_32.c b/arch/powerpc/kernel/machine_kexec_32.c
index ae63a964b858..e63f2e7d2efb 100644
--- a/arch/powerpc/kernel/machine_kexec_32.c
+++ b/arch/powerpc/kernel/machine_kexec_32.c
@@ -39,6 +39,10 @@ void default_machine_kexec(struct kimage *image)
         /* Interrupts aren't acceptable while we reboot */
         local_irq_disable();
 
+        /* mask each interrupt so we are in a more sane state for the
+         * kexec kernel */
+        machine_kexec_mask_interrupts();
+
         page_list = image->head;
 
         /* we need both effective and real address here */