1#include <linux/kernel.h> 2#include <linux/mmzone.h> 3#include <linux/spinlock.h> 4#include <linux/smp.h> 5#include <asm/atomic.h> 6#include <asm/sn/types.h> 7#include <asm/sn/addrs.h> 8#include <asm/sn/nmi.h> 9#include <asm/sn/arch.h> 10#include <asm/sn/sn0/hub.h> 11 12#define NODE_NUM_CPUS(n) CPUS_PER_NODE 13 14#define CNODEID_NONE (cnodeid_t)-1 15#define enter_panic_mode() spin_lock(&nmi_lock) 16 17typedef unsigned long machreg_t; 18 19spinlock_t nmi_lock = SPIN_LOCK_UNLOCKED; 20 21/* 22 * Lets see what else we need to do here. Set up sp, gp? 23 */ 24void nmi_dump(void) 25{ 26 void cont_nmi_dump(void); 27 28 cont_nmi_dump(); 29} 30 31void install_cpu_nmi_handler(int slice) 32{ 33 nmi_t *nmi_addr; 34 35 nmi_addr = (nmi_t *)NMI_ADDR(get_nasid(), slice); 36 if (nmi_addr->call_addr) 37 return; 38 nmi_addr->magic = NMI_MAGIC; 39 nmi_addr->call_addr = (void *)nmi_dump; 40 nmi_addr->call_addr_c = 41 (void *)(~((unsigned long)(nmi_addr->call_addr))); 42 nmi_addr->call_parm = 0; 43} 44 45/* 46 * Copy the cpu registers which have been saved in the IP27prom format 47 * into the eframe format for the node under consideration. 48 */ 49 50void 51nmi_cpu_eframe_save(nasid_t nasid, 52 int slice) 53{ 54 int i, numberof_nmi_cpu_regs; 55 machreg_t *prom_format; 56 57 /* Get the total number of registers being saved by the prom */ 58 numberof_nmi_cpu_regs = sizeof(struct reg_struct) / sizeof(machreg_t); 59 60 /* Get the pointer to the current cpu's register set. */ 61 prom_format = 62 (machreg_t *)(TO_UNCAC(TO_NODE(nasid, IP27_NMI_KREGS_OFFSET)) + 63 slice * IP27_NMI_KREGS_CPU_SIZE); 64 65 printk("NMI nasid %d: slice %d\n", nasid, slice); 66 for (i = 0; i < numberof_nmi_cpu_regs; i++) 67 printk("0x%lx ", prom_format[i]); 68 printk("\n\n"); 69} 70 71/* 72 * Copy the cpu registers which have been saved in the IP27prom format 73 * into the eframe format for the node under consideration. 74 */ 75void 76nmi_node_eframe_save(cnodeid_t cnode) 77{ 78 int cpu; 79 nasid_t nasid; 80 81 /* Make sure that we have a valid node */ 82 if (cnode == CNODEID_NONE) 83 return; 84 85 nasid = COMPACT_TO_NASID_NODEID(cnode); 86 if (nasid == INVALID_NASID) 87 return; 88 89 /* Save the registers into eframe for each cpu */ 90 for(cpu = 0; cpu < NODE_NUM_CPUS(cnode); cpu++) 91 nmi_cpu_eframe_save(nasid, cpu); 92} 93 94/* 95 * Save the nmi cpu registers for all cpus in the system. 96 */ 97void 98nmi_eframes_save(void) 99{ 100 cnodeid_t cnode; 101 102 for(cnode = 0 ; cnode < numnodes; cnode++) 103 nmi_node_eframe_save(cnode); 104} 105 106void 107cont_nmi_dump(void) 108{ 109#ifndef REAL_NMI_SIGNAL 110 static atomic_t nmied_cpus = ATOMIC_INIT(0); 111 112 atomic_inc(&nmied_cpus); 113#endif 114 /* 115 * Use enter_panic_mode to allow only 1 cpu to proceed 116 */ 117 enter_panic_mode(); 118 119#ifdef REAL_NMI_SIGNAL 120 /* 121 * Wait up to 15 seconds for the other cpus to respond to the NMI. 122 * If a cpu has not responded after 10 sec, send it 1 additional NMI. 123 * This is for 2 reasons: 124 * - sometimes a MMSC fail to NMI all cpus. 125 * - on 512p SN0 system, the MMSC will only send NMIs to 126 * half the cpus. Unfortunately, we dont know which cpus may be 127 * NMIed - it depends on how the site chooses to configure. 128 * 129 * Note: it has been measure that it takes the MMSC up to 2.3 secs to 130 * send NMIs to all cpus on a 256p system. 131 */ 132 for (i=0; i < 1500; i++) { 133 for (node=0; node < numnodes; node++) 134 if (NODEPDA(node)->dump_count == 0) 135 break; 136 if (node == numnodes) 137 break; 138 if (i == 1000) { 139 for (node=0; node < numnodes; node++) 140 if (NODEPDA(node)->dump_count == 0) { 141 cpu = CNODE_TO_CPU_BASE(node); 142 for (n=0; n < CNODE_NUM_CPUS(node); cpu++, n++) { 143 CPUMASK_SETB(nmied_cpus, cpu); 144 /* 145 * cputonasid, cputoslice 146 * needs kernel cpuid 147 */ 148 SEND_NMI((cputonasid(cpu)), (cputoslice(cpu))); 149 } 150 } 151 152 } 153 udelay(10000); 154 } 155#else 156 while (atomic_read(&nmied_cpus) != smp_num_cpus); 157#endif 158 159 /* 160 * Save the nmi cpu registers for all cpu in the eframe format. 161 */ 162 nmi_eframes_save(); 163 LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET); 164} 165