sparc64: Implement SSTATE purely using notifiers and initcalls.

Don't clutter up the tree with sstate_blah() scattered all over the
place.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 45 insertions, 29 deletions

diff --git a/arch/sparc64/kernel/hvapi.c b/arch/sparc64/kernel/hvapi.c
index 691760b5b012..1d272c3b5740 100644
--- a/arch/sparc64/kernel/hvapi.c
+++ b/arch/sparc64/kernel/hvapi.c
@@ -9,7 +9,6 @@
 
 #include <asm/hypervisor.h>
 #include <asm/oplib.h>
-#include <asm/sstate.h>
 
 /* If the hypervisor indicates that the API setting
  * calls are unsupported, by returning HV_EBADTRAP or
@@ -184,8 +183,6 @@ void __init sun4v_hvapi_init(void)
         if (sun4v_hvapi_register(group, major, &minor))
                 goto bad;
 
-        sun4v_sstate_init();
-
         return;
 
 bad:
diff --git a/arch/sparc64/kernel/reboot.c b/arch/sparc64/kernel/reboot.c
index 04dd34cbb872..11f249660630 100644
--- a/arch/sparc64/kernel/reboot.c
+++ b/arch/sparc64/kernel/reboot.c
@@ -7,7 +7,6 @@
 #include <linux/module.h>
 #include <linux/pm.h>
 
-#include <asm/sstate.h>
 #include <asm/oplib.h>
 #include <asm/prom.h>
 
@@ -24,7 +23,6 @@ EXPORT_SYMBOL(pm_power_off);
 
 void machine_power_off(void)
 {
-        sstate_poweroff();
         if (strcmp(of_console_device->type, "serial") || scons_pwroff)
                 prom_halt_power_off();
 
@@ -33,7 +31,6 @@ void machine_power_off(void)
 
 void machine_halt(void)
 {
-        sstate_halt();
         prom_halt();
         panic("Halt failed!");
 }
@@ -42,7 +39,6 @@ void machine_restart(char *cmd)
 {
         char *p;
 
-        sstate_reboot();
         p = strchr(reboot_command, '\n');
         if (p)
                 *p = 0;
diff --git a/arch/sparc64/kernel/sstate.c b/arch/sparc64/kernel/sstate.c
index 5b6e75b7f052..8cdbe5946b43 100644
--- a/arch/sparc64/kernel/sstate.c
+++ b/arch/sparc64/kernel/sstate.c
@@ -1,14 +1,15 @@
 /* sstate.c: System soft state support.
  *
- * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  */
 
 #include <linux/kernel.h>
 #include <linux/notifier.h>
+#include <linux/reboot.h>
 #include <linux/init.h>
 
 #include <asm/hypervisor.h>
-#include <asm/sstate.h>
+#include <asm/spitfire.h>
 #include <asm/oplib.h>
 #include <asm/head.h>
 #include <asm/io.h>
@@ -50,31 +51,34 @@ static const char rebooting_msg[32] __attribute__((aligned(32))) =
 static const char panicing_msg[32] __attribute__((aligned(32))) =
         "Linux panicing";
 
-void sstate_booting(void)
+static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused)
 {
-        do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
-}
+        const char *msg;
 
-void sstate_running(void)
-{
-        do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
-}
+        switch (type) {
+        case SYS_DOWN:
+        default:
+                msg = rebooting_msg;
+                break;
 
-void sstate_halt(void)
-{
-        do_set_sstate(HV_SOFT_STATE_TRANSITION, halting_msg);
-}
+        case SYS_HALT:
+                msg = halting_msg;
+                break;
 
-void sstate_poweroff(void)
-{
-        do_set_sstate(HV_SOFT_STATE_TRANSITION, poweroff_msg);
-}
+        case SYS_POWER_OFF:
+                msg = poweroff_msg;
+                break;
+        }
 
-void sstate_reboot(void)
-{
-        do_set_sstate(HV_SOFT_STATE_TRANSITION, rebooting_msg);
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, msg);
+
+        return NOTIFY_OK;
 }
 
+static struct notifier_block sstate_reboot_notifier = {
+        .notifier_call = sstate_reboot_call,
+};
+
 static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)
 {
         do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg);
@@ -87,18 +91,37 @@ static struct notifier_block sstate_panic_block = {
         .priority       =       INT_MAX,
 };
 
-void __init sun4v_sstate_init(void)
+static int __init sstate_init(void)
 {
         unsigned long major, minor;
 
+        if (tlb_type != hypervisor)
+                return 0;
+
         major = 1;
         minor = 0;
         if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
-                return;
+                return 0;
 
         hv_supports_soft_state = 1;
 
         prom_sun4v_guest_soft_state();
+
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
+
         atomic_notifier_chain_register(&panic_notifier_list,
                                        &sstate_panic_block);
+        register_reboot_notifier(&sstate_reboot_notifier);
+
+        return 0;
 }
+
+core_initcall(sstate_init);
+
+static int __init sstate_running(void)
+{
+        do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
+        return 0;
+}
+
+late_initcall(sstate_running);