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.
6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
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>
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>
30 #include "ip27-common.h"
33 * Takes as first input the PROM assigned cpu id, and the kernel
34 * assigned cpu id as the second.
36 static void alloc_cpupda(nasid_t nasid, cpuid_t cpu, int cpunum)
38 cputonasid(cpunum) = nasid;
39 cputoslice(cpunum) = get_cpu_slice(cpu);
42 static int do_cpumask(nasid_t nasid, int highest)
44 static int tot_cpus_found = 0;
50 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
53 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
55 cpuid = acpu->cpu_info.virtid;
56 /* Only let it join in if it's marked enabled */
57 if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
58 (tot_cpus_found != NR_CPUS)) {
61 set_cpu_possible(cpuid, true);
62 alloc_cpupda(nasid, cpuid, tot_cpus_found);
66 acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
73 brd = find_lboard(brd, KLTYPE_IP27);
79 void cpu_node_probe(void)
85 * MCD - this whole "compact node" stuff can probably be dropped,
86 * as we can handle sparse numbering now
88 nodes_clear(node_online_map);
89 for (i = 0; i < MAX_COMPACT_NODES; i++) {
90 nasid_t nasid = gdap->g_nasidtable[i];
91 if (nasid == INVALID_NASID)
93 node_set_online(nasid);
94 highest = do_cpumask(nasid, highest);
97 printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
100 static __init void intr_clear_all(nasid_t nasid)
104 REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
105 REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
106 REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
107 REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
109 for (i = 0; i < 128; i++)
110 REMOTE_HUB_CLR_INTR(nasid, i);
113 static void ip27_send_ipi_single(int destid, unsigned int action)
118 case SMP_RESCHEDULE_YOURSELF:
119 irq = CPU_RESCHED_A_IRQ;
121 case SMP_CALL_FUNCTION:
122 irq = CPU_CALL_A_IRQ;
128 irq += cputoslice(destid);
131 * Set the interrupt bit associated with the CPU we want to
132 * send the interrupt to.
134 REMOTE_HUB_SEND_INTR(cpu_to_node(destid), irq);
137 static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
141 for_each_cpu(i, mask)
142 ip27_send_ipi_single(i, action);
145 static void ip27_init_cpu(void)
150 static void ip27_smp_finish(void)
152 hub_rt_clock_event_init();
157 * Launch a slave into smp_bootstrap(). It doesn't take an argument, and we
158 * set sp to the kernel stack of the newly created idle process, gp to the proc
159 * struct so that current_thread_info() will work.
161 static int ip27_boot_secondary(int cpu, struct task_struct *idle)
163 unsigned long gp = (unsigned long)task_thread_info(idle);
164 unsigned long sp = __KSTK_TOS(idle);
166 LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
167 (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
168 0, (void *) sp, (void *) gp);
172 static void __init ip27_smp_setup(void)
176 for_each_online_node(nasid) {
179 intr_clear_all(nasid);
182 replicate_kernel_text();
185 * PROM sets up system, that boot cpu is always first CPU on nasid 0
187 alloc_cpupda(0, 0, 0);
190 static void __init ip27_prepare_cpus(unsigned int max_cpus)
192 /* We already did everything necessary earlier */
195 const struct plat_smp_ops ip27_smp_ops = {
196 .send_ipi_single = ip27_send_ipi_single,
197 .send_ipi_mask = ip27_send_ipi_mask,
198 .init_secondary = ip27_init_cpu,
199 .smp_finish = ip27_smp_finish,
200 .boot_secondary = ip27_boot_secondary,
201 .smp_setup = ip27_smp_setup,
202 .prepare_cpus = ip27_prepare_cpus,
203 .prepare_boot_cpu = ip27_init_cpu,