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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | /* * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com) * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc. */ #include <linux/init.h> #include <linux/sched.h> #include <linux/sched/task_stack.h> #include <linux/topology.h> #include <linux/nodemask.h> #include <asm/page.h> #include <asm/processor.h> #include <asm/ptrace.h> #include <asm/sn/agent.h> #include <asm/sn/arch.h> #include <asm/sn/gda.h> #include <asm/sn/intr.h> #include <asm/sn/klconfig.h> #include <asm/sn/launch.h> #include <asm/sn/mapped_kernel.h> #include <asm/sn/types.h> #include "ip27-common.h" static int node_scan_cpus(nasid_t nasid, int highest) { static int cpus_found; lboard_t *brd; klcpu_t *acpu; cpuid_t cpuid; brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27); do { acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU); while (acpu) { cpuid = acpu->cpu_info.virtid; /* Only let it join in if it's marked enabled */ if ((acpu->cpu_info.flags & KLINFO_ENABLE) && (cpus_found != NR_CPUS)) { if (cpuid > highest) highest = cpuid; set_cpu_possible(cpuid, true); cputonasid(cpus_found) = nasid; cputoslice(cpus_found) = acpu->cpu_info.physid; sn_cpu_info[cpus_found].p_speed = acpu->cpu_speed; cpus_found++; } acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu, KLSTRUCT_CPU); } brd = KLCF_NEXT(brd); if (!brd) break; brd = find_lboard(brd, KLTYPE_IP27); } while (brd); return highest; } void cpu_node_probe(void) { int i, highest = 0; gda_t *gdap = GDA; nodes_clear(node_online_map); for (i = 0; i < MAX_NUMNODES; i++) { nasid_t nasid = gdap->g_nasidtable[i]; if (nasid == INVALID_NASID) break; node_set_online(nasid); highest = node_scan_cpus(nasid, highest); } printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes()); } static __init void intr_clear_all(nasid_t nasid) { int i; REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0); REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0); REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0); REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0); for (i = 0; i < 128; i++) REMOTE_HUB_CLR_INTR(nasid, i); } static void ip27_send_ipi_single(int destid, unsigned int action) { int irq; switch (action) { case SMP_RESCHEDULE_YOURSELF: irq = CPU_RESCHED_A_IRQ; break; case SMP_CALL_FUNCTION: irq = CPU_CALL_A_IRQ; break; default: panic("sendintr"); } irq += cputoslice(destid); /* * Set the interrupt bit associated with the CPU we want to * send the interrupt to. */ REMOTE_HUB_SEND_INTR(cpu_to_node(destid), irq); } static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action) { unsigned int i; for_each_cpu(i, mask) ip27_send_ipi_single(i, action); } static void ip27_init_cpu(void) { per_cpu_init(); } static void ip27_smp_finish(void) { hub_rt_clock_event_init(); local_irq_enable(); } /* * Launch a slave into smp_bootstrap(). It doesn't take an argument, and we * set sp to the kernel stack of the newly created idle process, gp to the proc * struct so that current_thread_info() will work. */ static int ip27_boot_secondary(int cpu, struct task_struct *idle) { unsigned long gp = (unsigned long)task_thread_info(idle); unsigned long sp = __KSTK_TOS(idle); LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu), (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap), 0, (void *) sp, (void *) gp); return 0; } static void __init ip27_smp_setup(void) { nasid_t nasid; for_each_online_node(nasid) { if (nasid == 0) continue; intr_clear_all(nasid); } replicate_kernel_text(); /* * PROM sets up system, that boot cpu is always first CPU on nasid 0 */ cputonasid(0) = 0; cputoslice(0) = LOCAL_HUB_L(PI_CPU_NUM); } static void __init ip27_prepare_cpus(unsigned int max_cpus) { /* We already did everything necessary earlier */ } const struct plat_smp_ops ip27_smp_ops = { .send_ipi_single = ip27_send_ipi_single, .send_ipi_mask = ip27_send_ipi_mask, .init_secondary = ip27_init_cpu, .smp_finish = ip27_smp_finish, .boot_secondary = ip27_boot_secondary, .smp_setup = ip27_smp_setup, .prepare_cpus = ip27_prepare_cpus, .prepare_boot_cpu = ip27_init_cpu, }; |