1/* sstate.c: System soft state support. 2 * 3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net> 4 */ 5 6#include <linux/kernel.h> 7#include <linux/notifier.h> 8#include <linux/init.h> 9 10#include <asm/hypervisor.h> 11#include <asm/sstate.h> 12#include <asm/oplib.h> 13#include <asm/head.h> 14#include <asm/io.h> 15 16static int hv_supports_soft_state; 17 18static unsigned long kimage_addr_to_ra(const char *p) 19{ 20 unsigned long val = (unsigned long) p; 21 22 return kern_base + (val - KERNBASE); 23} 24 25static void do_set_sstate(unsigned long state, const char *msg) 26{ 27 unsigned long err; 28 29 if (!hv_supports_soft_state) 30 return; 31 32 err = sun4v_mach_set_soft_state(state, kimage_addr_to_ra(msg)); 33 if (err) { 34 printk(KERN_WARNING "SSTATE: Failed to set soft-state to " 35 "state[%lx] msg[%s], err=%lu\n", 36 state, msg, err); 37 } 38} 39 40static const char booting_msg[32] __attribute__((aligned(32))) = 41 "Linux booting"; 42static const char running_msg[32] __attribute__((aligned(32))) = 43 "Linux running"; 44static const char halting_msg[32] __attribute__((aligned(32))) = 45 "Linux halting"; 46static const char poweroff_msg[32] __attribute__((aligned(32))) = 47 "Linux powering off"; 48static const char rebooting_msg[32] __attribute__((aligned(32))) = 49 "Linux rebooting"; 50static const char panicing_msg[32] __attribute__((aligned(32))) = 51 "Linux panicing"; 52 53void sstate_booting(void) 54{ 55 do_set_sstate(HV_SOFT_STATE_TRANSITION, booting_msg); 56} 57 58void sstate_running(void) 59{ 60 do_set_sstate(HV_SOFT_STATE_NORMAL, running_msg); 61} 62 63void sstate_halt(void) 64{ 65 do_set_sstate(HV_SOFT_STATE_TRANSITION, halting_msg); 66} 67 68void sstate_poweroff(void) 69{ 70 do_set_sstate(HV_SOFT_STATE_TRANSITION, poweroff_msg); 71} 72 73void sstate_reboot(void) 74{ 75 do_set_sstate(HV_SOFT_STATE_TRANSITION, rebooting_msg); 76} 77 78static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr) 79{ 80 do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg); 81 82 return NOTIFY_DONE; 83} 84 85static struct notifier_block sstate_panic_block = { 86 .notifier_call = sstate_panic_event, 87 .priority = INT_MAX, 88}; 89 90void __init sun4v_sstate_init(void) 91{ 92 unsigned long major, minor; 93 94 major = 1; 95 minor = 0; 96 if (sun4v_hvapi_register(HV_GRP_SOFT_STATE, major, &minor)) 97 return; 98 99 hv_supports_soft_state = 1; 100 101 prom_sun4v_guest_soft_state(); 102 atomic_notifier_chain_register(&panic_notifier_list, 103 &sstate_panic_block); 104} 105