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>
31 * Takes as first input the PROM assigned cpu id, and the kernel
32 * assigned cpu id as the second.
34 static void alloc_cpupda(cpuid_t cpu, int cpunum)
36 cnodeid_t node = get_cpu_cnode(cpu);
37 nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
39 cputonasid(cpunum) = nasid;
40 sn_cpu_info[cpunum].p_nodeid = node;
41 cputoslice(cpunum) = get_cpu_slice(cpu);
44 static nasid_t get_actual_nasid(lboard_t *brd)
51 /* find out if we are a completely disabled brd. */
52 hub = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
55 if (!(hub->hub_info.flags & KLINFO_ENABLE)) /* disabled node brd */
56 return hub->hub_info.physid;
58 return brd->brd_nasid;
61 static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
63 static int tot_cpus_found = 0;
69 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
72 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
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;
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);
88 acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
95 brd = find_lboard(brd, KLTYPE_IP27);
101 void cpu_node_probe(void)
107 * Initialize the arrays to invalid nodeid (-1)
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;
117 * MCD - this whole "compact node" stuff can probably be dropped,
118 * as we can handle sparse numbering now
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)
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);
131 printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
134 static __init void intr_clear_all(nasid_t nasid)
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);
143 for (i = 0; i < 128; i++)
144 REMOTE_HUB_CLR_INTR(nasid, i);
147 static void ip27_send_ipi_single(int destid, unsigned int action)
152 case SMP_RESCHEDULE_YOURSELF:
153 irq = CPU_RESCHED_A_IRQ;
155 case SMP_CALL_FUNCTION:
156 irq = CPU_CALL_A_IRQ;
162 irq += cputoslice(destid);
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.
169 REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
172 static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
176 for_each_cpu(i, mask)
177 ip27_send_ipi_single(i, action);
180 static void ip27_init_secondary(void)
185 static void ip27_smp_finish(void)
187 extern void hub_rt_clock_event_init(void);
189 hub_rt_clock_event_init();
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.
198 static int ip27_boot_secondary(int cpu, struct task_struct *idle)
200 unsigned long gp = (unsigned long)task_thread_info(idle);
201 unsigned long sp = __KSTK_TOS(idle);
203 LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
204 (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
205 0, (void *) sp, (void *) gp);
209 static void __init ip27_smp_setup(void)
213 for_each_online_node(cnode) {
216 intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
219 replicate_kernel_text();
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.
230 static void __init ip27_prepare_cpus(unsigned int max_cpus)
232 /* We already did everything necessary earlier */
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,