1 /* 2 * This file is subject to the terms and conditions of the GNU General 3 * Public License. See the file "COPYING" in the main directory of this 4 * archive for more details. 5 * 6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com) 7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc. 8 */ 9 #include <linux/init.h> 10 #include <linux/sched.h> 11 #include <linux/sched/task_stack.h> 12 #include <linux/topology.h> 13 #include <linux/nodemask.h> 14 15 #include <asm/page.h> 16 #include <asm/processor.h> 17 #include <asm/ptrace.h> 18 #include <asm/sn/arch.h> 19 #include <asm/sn/gda.h> 20 #include <asm/sn/intr.h> 21 #include <asm/sn/klconfig.h> 22 #include <asm/sn/launch.h> 23 #include <asm/sn/mapped_kernel.h> 24 #include <asm/sn/sn_private.h> 25 #include <asm/sn/types.h> 26 #include <asm/sn/sn0/hubpi.h> 27 #include <asm/sn/sn0/hubio.h> 28 #include <asm/sn/sn0/ip27.h> 29 30 /* 31 * Takes as first input the PROM assigned cpu id, and the kernel 32 * assigned cpu id as the second. 33 */ 34 static void alloc_cpupda(cpuid_t cpu, int cpunum) 35 { 36 cnodeid_t node = get_cpu_cnode(cpu); 37 nasid_t nasid = COMPACT_TO_NASID_NODEID(node); 38 39 cputonasid(cpunum) = nasid; 40 sn_cpu_info[cpunum].p_nodeid = node; 41 cputoslice(cpunum) = get_cpu_slice(cpu); 42 } 43 44 static nasid_t get_actual_nasid(lboard_t *brd) 45 { 46 klhub_t *hub; 47 48 if (!brd) 49 return INVALID_NASID; 50 51 /* find out if we are a completely disabled brd. */ 52 hub = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB); 53 if (!hub) 54 return INVALID_NASID; 55 if (!(hub->hub_info.flags & KLINFO_ENABLE)) /* disabled node brd */ 56 return hub->hub_info.physid; 57 else 58 return brd->brd_nasid; 59 } 60 61 static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest) 62 { 63 static int tot_cpus_found = 0; 64 lboard_t *brd; 65 klcpu_t *acpu; 66 int cpus_found = 0; 67 cpuid_t cpuid; 68 69 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27); 70 71 do { 72 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU); 73 while (acpu) { 74 cpuid = acpu->cpu_info.virtid; 75 /* cnode is not valid for completely disabled brds */ 76 if (get_actual_nasid(brd) == brd->brd_nasid) 77 cpuid_to_compact_node[cpuid] = cnode; 78 if (cpuid > highest) 79 highest = cpuid; 80 /* Only let it join in if it's marked enabled */ 81 if ((acpu->cpu_info.flags & KLINFO_ENABLE) && 82 (tot_cpus_found != NR_CPUS)) { 83 set_cpu_possible(cpuid, true); 84 alloc_cpupda(cpuid, tot_cpus_found); 85 cpus_found++; 86 tot_cpus_found++; 87 } 88 acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu, 89 KLSTRUCT_CPU); 90 } 91 brd = KLCF_NEXT(brd); 92 if (!brd) 93 break; 94 95 brd = find_lboard(brd, KLTYPE_IP27); 96 } while (brd); 97 98 return highest; 99 } 100 101 void cpu_node_probe(void) 102 { 103 int i, highest = 0; 104 gda_t *gdap = GDA; 105 106 /* 107 * Initialize the arrays to invalid nodeid (-1) 108 */ 109 for (i = 0; i < MAX_COMPACT_NODES; i++) 110 compact_to_nasid_node[i] = INVALID_NASID; 111 for (i = 0; i < MAX_NASIDS; i++) 112 nasid_to_compact_node[i] = INVALID_CNODEID; 113 for (i = 0; i < MAXCPUS; i++) 114 cpuid_to_compact_node[i] = INVALID_CNODEID; 115 116 /* 117 * MCD - this whole "compact node" stuff can probably be dropped, 118 * as we can handle sparse numbering now 119 */ 120 nodes_clear(node_online_map); 121 for (i = 0; i < MAX_COMPACT_NODES; i++) { 122 nasid_t nasid = gdap->g_nasidtable[i]; 123 if (nasid == INVALID_NASID) 124 break; 125 compact_to_nasid_node[i] = nasid; 126 nasid_to_compact_node[nasid] = i; 127 node_set_online(num_online_nodes()); 128 highest = do_cpumask(i, nasid, highest); 129 } 130 131 printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes()); 132 } 133 134 static __init void intr_clear_all(nasid_t nasid) 135 { 136 int i; 137 138 REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0); 139 REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0); 140 REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0); 141 REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0); 142 143 for (i = 0; i < 128; i++) 144 REMOTE_HUB_CLR_INTR(nasid, i); 145 } 146 147 static void ip27_send_ipi_single(int destid, unsigned int action) 148 { 149 int irq; 150 151 switch (action) { 152 case SMP_RESCHEDULE_YOURSELF: 153 irq = CPU_RESCHED_A_IRQ; 154 break; 155 case SMP_CALL_FUNCTION: 156 irq = CPU_CALL_A_IRQ; 157 break; 158 default: 159 panic("sendintr"); 160 } 161 162 irq += cputoslice(destid); 163 164 /* 165 * Convert the compact hub number to the NASID to get the correct 166 * part of the address space. Then set the interrupt bit associated 167 * with the CPU we want to send the interrupt to. 168 */ 169 REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq); 170 } 171 172 static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action) 173 { 174 unsigned int i; 175 176 for_each_cpu(i, mask) 177 ip27_send_ipi_single(i, action); 178 } 179 180 static void ip27_init_secondary(void) 181 { 182 per_cpu_init(); 183 } 184 185 static void ip27_smp_finish(void) 186 { 187 extern void hub_rt_clock_event_init(void); 188 189 hub_rt_clock_event_init(); 190 local_irq_enable(); 191 } 192 193 /* 194 * Launch a slave into smp_bootstrap(). It doesn't take an argument, and we 195 * set sp to the kernel stack of the newly created idle process, gp to the proc 196 * struct so that current_thread_info() will work. 197 */ 198 static int ip27_boot_secondary(int cpu, struct task_struct *idle) 199 { 200 unsigned long gp = (unsigned long)task_thread_info(idle); 201 unsigned long sp = __KSTK_TOS(idle); 202 203 LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu), 204 (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap), 205 0, (void *) sp, (void *) gp); 206 return 0; 207 } 208 209 static void __init ip27_smp_setup(void) 210 { 211 cnodeid_t cnode; 212 213 for_each_online_node(cnode) { 214 if (cnode == 0) 215 continue; 216 intr_clear_all(COMPACT_TO_NASID_NODEID(cnode)); 217 } 218 219 replicate_kernel_text(); 220 221 /* 222 * Assumption to be fixed: we're always booted on logical / physical 223 * processor 0. While we're always running on logical processor 0 224 * this still means this is physical processor zero; it might for 225 * example be disabled in the firmware. 226 */ 227 alloc_cpupda(0, 0); 228 } 229 230 static void __init ip27_prepare_cpus(unsigned int max_cpus) 231 { 232 /* We already did everything necessary earlier */ 233 } 234 235 const struct plat_smp_ops ip27_smp_ops = { 236 .send_ipi_single = ip27_send_ipi_single, 237 .send_ipi_mask = ip27_send_ipi_mask, 238 .init_secondary = ip27_init_secondary, 239 .smp_finish = ip27_smp_finish, 240 .boot_secondary = ip27_boot_secondary, 241 .smp_setup = ip27_smp_setup, 242 .prepare_cpus = ip27_prepare_cpus, 243 }; 244