[SPARC64]: Report proper system soft state to the hypervisor.

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

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 \

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

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:

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) {

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)

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);
+}

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

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)
 {

include/asm-sparc64/bugs.h

@@ -1,9 +1,8 @@
-/*  $Id: bugs.h,v 1.1 1996/12/26 13:25:20 davem Exp $
- *  include/asm-sparc64/bugs.h:  Sparc probes for various bugs.
+/* bugs.h: Sparc64 probes for various bugs.
  *
- *  Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996, 2007 David S. Miller (davem@davemloft.net)
  */
-
+#include <asm/sstate.h>
 
 extern unsigned long loops_per_jiffy;
 
@@ -12,4 +11,5 @@ static void __init check_bugs(void)
 #ifndef CONFIG_SMP
 	cpu_data(0).udelay_val = loops_per_jiffy;
 #endif
+	sstate_running();
 }

include/asm-sparc64/hypervisor.h

@@ -162,10 +162,15 @@
  * terminated 7-bit ASCII string of up to 31 characters not including the
  * NULL termination.
  */
-#define HV_FAST_MACH_SET_SOFT_STATE	0x03
+#define HV_FAST_MACH_SET_SOFT_STATE	0x70
 #define  HV_SOFT_STATE_NORMAL		 0x01
 #define  HV_SOFT_STATE_TRANSITION	 0x02
 
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_mach_set_soft_state(unsigned long soft_state,
+					       unsigned long msg_string_ra);
+#endif
+
 /* mach_get_soft_state()
  * TRAP:	HV_FAST_TRAP
  * FUNCTION:	HV_FAST_MACH_GET_SOFT_STATE
@@ -181,7 +186,7 @@
  * for the software state pointer are the same as for mach_set_soft_state()
  * above.
  */
-#define HV_FAST_MACH_GET_SOFT_STATE	0x04
+#define HV_FAST_MACH_GET_SOFT_STATE	0x71
 
 /* CPU services.
  *
@@ -2204,6 +2209,7 @@ extern void sun4v_hvapi_unregister(unsigned long group);
 extern int sun4v_hvapi_get(unsigned long group,
 			   unsigned long *major,
 			   unsigned long *minor);
+extern void sun4v_hvapi_init(void);
 #endif
 
 #endif /* !(_SPARC64_HYPERVISOR_H) */

include/asm-sparc64/oplib.h

@@ -316,6 +316,8 @@ extern int prom_setprop(int node, const char *prop_name, char *prop_value,
 
 extern int prom_pathtoinode(const char *path);
 extern int prom_inst2pkg(int);
+extern int prom_service_exists(const char *service_name);
+extern void prom_sun4v_guest_soft_state(void);
 
 /* CPU probing helpers.  */
 struct device_node;

include/asm-sparc64/sstate.h

@@ -0,0 +1,13 @@
+#ifndef _SPARC64_SSTATE_H
+#define _SPARC64_SSTATE_H
+
+extern void sstate_booting(void);
+extern void sstate_running(void);
+extern void sstate_halt(void);
+extern void sstate_poweroff(void);
+extern void sstate_panic(void);
+extern void sstate_reboot(void);
+
+extern void sun4v_sstate_init(void);
+
+#endif /* _SPARC64_SSTATE_H */