[POWERPC] Cleanup pseries kexec code

Move all the pseries kexec code into one file, platforms/pseries/kexec.c
Provide helpers for setting up ppc_md.kexec_cpu_down, so that we don't
have to have #ifdef CONFIG_KEXEC in setup.c

Move the initialisation of the ppc_md kexec callbacks into an init routine.
This is well and truly early enough to cause no change in behaviour, we
can't kexec until userspace has given us a kernel to kexec into.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 83 insertions, 48 deletions

diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 69590fbf83d..dc0583bdbc6 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_XICS)      += xics.o
 obj-$(CONFIG_SCANLOG)   += scanlog.o
 obj-$(CONFIG_EEH)       += eeh.o eeh_cache.o eeh_driver.o eeh_event.o
+obj-$(CONFIG_KEXEC)     += kexec.o
 
 obj-$(CONFIG_HOTPLUG_CPU)       += hotplug-cpu.o
 
diff --git a/arch/powerpc/platforms/pseries/kexec.c b/arch/powerpc/platforms/pseries/kexec.c
new file mode 100644
index 00000000000..af268560745
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/kexec.c
@@ -0,0 +1,72 @@
+/*
+ *  Copyright 2006 Michael Ellerman, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/machdep.h>
+#include <asm/page.h>
+#include <asm/firmware.h>
+#include <asm/kexec.h>
+#include <asm/mpic.h>
+
+#include "pseries.h"
+#include "xics.h"
+#include "plpar_wrappers.h"
+
+static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
+{
+        /* Don't risk a hypervisor call if we're crashing */
+        if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
+                unsigned long addr;
+
+                addr = __pa(get_slb_shadow());
+                if (unregister_slb_shadow(hard_smp_processor_id(), addr))
+                        printk("SLB shadow buffer deregistration of "
+                               "cpu %u (hw_cpu_id %d) failed\n",
+                               smp_processor_id(),
+                               hard_smp_processor_id());
+
+                addr = __pa(get_lppaca());
+                if (unregister_vpa(hard_smp_processor_id(), addr)) {
+                        printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
+                                        "failed\n", smp_processor_id(),
+                                        hard_smp_processor_id());
+                }
+        }
+}
+
+static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
+{
+        pseries_kexec_cpu_down(crash_shutdown, secondary);
+        mpic_teardown_this_cpu(secondary);
+}
+
+void __init setup_kexec_cpu_down_mpic(void)
+{
+        ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
+}
+
+static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
+{
+        pseries_kexec_cpu_down(crash_shutdown, secondary);
+        xics_teardown_cpu(secondary);
+}
+
+void __init setup_kexec_cpu_down_xics(void)
+{
+        ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
+}
+
+static int __init pseries_kexec_setup(void)
+{
+        ppc_md.machine_kexec = default_machine_kexec;
+        ppc_md.machine_kexec_prepare = default_machine_kexec_prepare;
+        ppc_md.machine_crash_shutdown = default_machine_crash_shutdown;
+
+        return 0;
+}
+__initcall(pseries_kexec_setup);
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 36c79157268..b43f1397a5b 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -25,4 +25,12 @@ static inline smp_init_pseries_mpic(void) { };
 static inline smp_init_pseries_xics(void) { };
 #endif
 
+#ifdef CONFIG_KEXEC
+extern void setup_kexec_cpu_down_xics(void);
+extern void setup_kexec_cpu_down_mpic(void);
+#else
+static inline setup_kexec_cpu_down_xics(void) { };
+static inline setup_kexec_cpu_down_mpic(void) { };
+#endif
+
 #endif /* _PSERIES_PSERIES_H */
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 769815680be..435a0459652 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -55,7 +55,6 @@
 #include <asm/dma.h>
 #include <asm/machdep.h>
 #include <asm/irq.h>
-#include <asm/kexec.h>
 #include <asm/time.h>
 #include <asm/nvram.h>
 #include "xics.h"
@@ -219,42 +218,6 @@ static void pseries_lpar_enable_pmcs(void)
                 get_lppaca()->pmcregs_in_use = 1;
 }
 
-#ifdef CONFIG_KEXEC
-static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
-{
-        /* Don't risk a hypervisor call if we're crashing */
-        if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
-                unsigned long addr;
-
-                addr = __pa(get_slb_shadow());
-                if (unregister_slb_shadow(hard_smp_processor_id(), addr))
-                        printk("SLB shadow buffer deregistration of "
-                               "cpu %u (hw_cpu_id %d) failed\n",
-                               smp_processor_id(),
-                               hard_smp_processor_id());
-
-                addr = __pa(get_lppaca());
-                if (unregister_vpa(hard_smp_processor_id(), addr)) {
-                        printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
-                                        "failed\n", smp_processor_id(),
-                                        hard_smp_processor_id());
-                }
-        }
-}
-
-static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
-{
-        pseries_kexec_cpu_down(crash_shutdown, secondary);
-        mpic_teardown_this_cpu(secondary);
-}
-
-static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
-{
-        pseries_kexec_cpu_down(crash_shutdown, secondary);
-        xics_teardown_cpu(secondary);
-}
-#endif /* CONFIG_KEXEC */
-
 static void __init pseries_discover_pic(void)
 {
         struct device_node *np;
@@ -267,16 +230,12 @@ static void __init pseries_discover_pic(void)
                         pSeries_mpic_node = of_node_get(np);
                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
                         ppc_md.get_irq        = mpic_get_irq;
-#ifdef CONFIG_KEXEC
-                        ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
-#endif
+                        setup_kexec_cpu_down_mpic();
                         smp_init_pseries_mpic();
                         return;
                 } else if (strstr(typep, "ppc-xicp")) {
                         ppc_md.init_IRQ       = xics_init_IRQ;
-#ifdef CONFIG_KEXEC
-                        ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
-#endif
+                        setup_kexec_cpu_down_xics();
                         smp_init_pseries_xics();
                         return;
                 }
@@ -548,9 +507,4 @@ define_machine(pseries) {
         .check_legacy_ioport    = pSeries_check_legacy_ioport,
         .system_reset_exception = pSeries_system_reset_exception,
         .machine_check_exception = pSeries_machine_check_exception,
-#ifdef CONFIG_KEXEC
-        .machine_kexec          = default_machine_kexec,
-        .machine_kexec_prepare  = default_machine_kexec_prepare,
-        .machine_crash_shutdown = default_machine_crash_shutdown,
-#endif
 };