8 files changed, 148 insertions, 1 deletions

diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile
index c749dccacc32..18e31a8db017 100644
--- a/arch/sparc64/kernel/Makefile
+++ b/arch/sparc64/kernel/Makefile
@@ -12,7 +12,7 @@ obj-y		:= process.o setup.o cpu.o idprom.o \
                    irq.o ptrace.o time.o sys_sparc.o signal.o \
                    unaligned.o central.o pci.o starfire.o semaphore.o \
                    power.o sbus.o iommu_common.o sparc64_ksyms.o chmc.o \
-                   visemul.o prom.o of_device.o hvapi.o
+                   visemul.o prom.o of_device.o hvapi.o sstate.o
 
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
 obj-$(CONFIG_PCI)        += ebus.o isa.o pci_common.o pci_iommu.o \
diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index 732b77cb71f8..b5dbd5709155 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -1937,3 +1937,15 @@ sun4v_con_write:
         stx     %o1, [%o4]
         retl
          nop
+
+        /* %o0: soft state
+         * %o1: address of description string
+         *
+         * returns %o0: status
+         */
+        .globl  sun4v_mach_set_soft_state
+sun4v_mach_set_soft_state:
+        mov     HV_FAST_MACH_SET_SOFT_STATE, %o5
+        ta      HV_FAST_TRAP
+        retl
+         nop
diff --git a/arch/sparc64/kernel/hvapi.c b/arch/sparc64/kernel/hvapi.c
index f54b3ed3b09e..f34f5d6181ef 100644
--- a/arch/sparc64/kernel/hvapi.c
+++ b/arch/sparc64/kernel/hvapi.c
@@ -9,6 +9,7 @@
 
 #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
@@ -179,6 +180,8 @@ 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/power.c b/arch/sparc64/kernel/power.c
index 699b24b890df..5d6adea3967f 100644
--- a/arch/sparc64/kernel/power.c
+++ b/arch/sparc64/kernel/power.c
@@ -19,6 +19,7 @@
 #include <asm/prom.h>
 #include <asm/of_device.h>
 #include <asm/io.h>
+#include <asm/sstate.h>
 
 #include <linux/unistd.h>
 
@@ -53,6 +54,7 @@ static void (*poweroff_method)(void) = machine_alt_power_off;
 
 void machine_power_off(void)
 {
+        sstate_poweroff();
         if (!serial_console || scons_pwroff) {
 #ifdef CONFIG_PCI
                 if (power_reg) {
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 952762bfb4c0..f5f97e2c669c 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -45,6 +45,7 @@
 #include <asm/mmu_context.h>
 #include <asm/unistd.h>
 #include <asm/hypervisor.h>
+#include <asm/sstate.h>
 
 /* #define VERBOSE_SHOWREGS */
 
@@ -106,6 +107,7 @@ extern void (*prom_keyboard)(void);
 
 void machine_halt(void)
 {
+        sstate_halt();
         if (!serial_console && prom_palette)
                 prom_palette (1);
         if (prom_keyboard)
@@ -116,6 +118,7 @@ void machine_halt(void)
 
 void machine_alt_power_off(void)
 {
+        sstate_poweroff();
         if (!serial_console && prom_palette)
                 prom_palette(1);
         if (prom_keyboard)
@@ -128,6 +131,7 @@ void machine_restart(char * cmd)
 {
         char *p;
         
+        sstate_reboot();
         p = strchr (reboot_command, '\n');
         if (p) *p = 0;
         if (!serial_console && prom_palette)
diff --git a/arch/sparc64/kernel/sstate.c b/arch/sparc64/kernel/sstate.c
new file mode 100644
index 000000000000..5b6e75b7f052
--- /dev/null
+++ b/arch/sparc64/kernel/sstate.c
@@ -0,0 +1,104 @@
+/* sstate.c: System soft state support.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+
+#include <asm/hypervisor.h>
+#include <asm/sstate.h>
+#include <asm/oplib.h>
+#include <asm/head.h>
+#include <asm/io.h>
+
+static int hv_supports_soft_state;
+
+static unsigned long kimage_addr_to_ra(const char *p)
+{
+        unsigned long val = (unsigned long) p;
+
+        return kern_base + (val - KERNBASE);
+}
+
+static void do_set_sstate(unsigned long state, const char *msg)
+{
+        unsigned long err;
+
+        if (!hv_supports_soft_state)
+                return;
+
+        err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg));
+        if (err) {
+                printk(KERN_WARNING "SSTATE: Failed to set soft-state to "
+                       "state[%lx] msg[%s], err=%lu\n",
+                       state, msg, err);
+        }
+}
+
+static const char booting_msg[32] __attribute__((aligned(32))) =
+        "Linux booting";
+static const char running_msg[32] __attribute__((aligned(32))) =
+        "Linux running";
+static const char halting_msg[32] __attribute__((aligned(32))) =
+        "Linux halting";
+static const char poweroff_msg[32] __attribute__((aligned(32))) =
+        "Linux powering off";
+static const char rebooting_msg[32] __attribute__((aligned(32))) =
+        "Linux rebooting";
+static const char panicing_msg[32] __attribute__((aligned(32))) =
+        "Linux panicing";
+
+void sstate_booting(void)
+{
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg);
+}
+
+void sstate_running(void)
+{
+        do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg);
+}
+
+void sstate_halt(void)
+{
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, halting_msg);
+}
+
+void sstate_poweroff(void)
+{
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, poweroff_msg);
+}
+
+void sstate_reboot(void)
+{
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, rebooting_msg);
+}
+
+static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)
+{
+        do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg);
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block sstate_panic_block = {
+        .notifier_call  =       sstate_panic_event,
+        .priority       =       INT_MAX,
+};
+
+void __init sun4v_sstate_init(void)
+{
+        unsigned long major, minor;
+
+        major = 1;
+        minor = 0;
+        if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor))
+                return;
+
+        hv_supports_soft_state = 1;
+
+        prom_sun4v_guest_soft_state();
+        atomic_notifier_chain_register(&panic_notifier_list,
+                                       &sstate_panic_block);
+}
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 6e5b01d779d2..0c9995c3b8ed 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -43,6 +43,7 @@
 #include <asm/tsb.h>
 #include <asm/hypervisor.h>
 #include <asm/prom.h>
+#include <asm/sstate.h>
 
 extern void device_scan(void);
 
@@ -1348,6 +1349,8 @@ void __init paging_init(void)
         kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
         kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
 
+        sstate_booting();
+
         /* Invalidate both kernel TSBs.  */
         memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
 #ifndef CONFIG_DEBUG_PAGEALLOC
diff --git a/arch/sparc64/prom/misc.c b/arch/sparc64/prom/misc.c
index 0b4213720d43..f3e0c14e9eef 100644
--- a/arch/sparc64/prom/misc.c
+++ b/arch/sparc64/prom/misc.c
@@ -15,6 +15,25 @@
 #include <asm/oplib.h>
 #include <asm/system.h>
 
+int prom_service_exists(const char *service_name)
+{
+        int err = p1275_cmd("test", P1275_ARG(0, P1275_ARG_IN_STRING) |
+                            P1275_INOUT(1, 1), service_name);
+
+        if (err)
+                return 0;
+        return 1;
+}
+
+void prom_sun4v_guest_soft_state(void)
+{
+        const char *svc = "SUNW,soft-state-supported";
+
+        if (!prom_service_exists(svc))
+                return;
+        p1275_cmd(svc, P1275_INOUT(0, 0));
+}
+
 /* Reset and reboot the machine with the command 'bcommand'. */
 void prom_reboot(const char *bcommand)
 {