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