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/nodemask.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>
27 * Takes as first input the PROM assigned cpu id, and the kernel
28 * assigned cpu id as the second.
30 static void alloc_cpupda(cpuid_t cpu, int cpunum)
32 cnodeid_t node = get_cpu_cnode(cpu);
33 nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
35 cputonasid(cpunum) = nasid;
36 sn_cpu_info[cpunum].p_nodeid = node;
37 cputoslice(cpunum) = get_cpu_slice(cpu);
40 static nasid_t get_actual_nasid(lboard_t *brd)
47 /* find out if we are a completely disabled brd. */
48 hub = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
51 if (!(hub->hub_info.flags & KLINFO_ENABLE)) /* disabled node brd */
52 return hub->hub_info.physid;
54 return brd->brd_nasid;
57 static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
59 static int tot_cpus_found = 0;
65 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
68 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
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;
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 cpu_set(cpuid, cpu_possible_map);
80 alloc_cpupda(cpuid, tot_cpus_found);
84 acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
91 brd = find_lboard(brd, KLTYPE_IP27);
97 void cpu_node_probe(void)
103 * Initialize the arrays to invalid nodeid (-1)
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;
113 * MCD - this whole "compact node" stuff can probably be dropped,
114 * as we can handle sparse numbering now
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)
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);
127 printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
130 static __init void intr_clear_all(nasid_t nasid)
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);
139 for (i = 0; i < 128; i++)
140 REMOTE_HUB_CLR_INTR(nasid, i);
143 static void ip27_send_ipi_single(int destid, unsigned int action)
148 case SMP_RESCHEDULE_YOURSELF:
149 irq = CPU_RESCHED_A_IRQ;
151 case SMP_CALL_FUNCTION:
152 irq = CPU_CALL_A_IRQ;
158 irq += cputoslice(destid);
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.
165 REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
168 static void ip27_send_ipi_mask(cpumask_t mask, unsigned int action)
172 for_each_cpu_mask(i, mask)
173 ip27_send_ipi_single(i, action);
176 static void __cpuinit ip27_init_secondary(void)
181 static void __cpuinit ip27_smp_finish(void)
183 extern void hub_rt_clock_event_init(void);
185 hub_rt_clock_event_init();
189 static void __init ip27_cpus_done(void)
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 void __cpuinit 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);
208 static void __init ip27_smp_setup(void)
212 for_each_online_node(cnode) {
215 intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
218 replicate_kernel_text();
221 * Assumption to be fixed: we're always booted on logical / physical
222 * processor 0. While we're always running on logical processor 0
223 * this still means this is physical processor zero; it might for
224 * example be disabled in the firmware.
229 static void __init ip27_prepare_cpus(unsigned int max_cpus)
231 /* We already did everything necessary earlier */
234 struct plat_smp_ops ip27_smp_ops = {
235 .send_ipi_single = ip27_send_ipi_single,
236 .send_ipi_mask = ip27_send_ipi_mask,
237 .init_secondary = ip27_init_secondary,
238 .smp_finish = ip27_smp_finish,
239 .cpus_done = ip27_cpus_done,
240 .boot_secondary = ip27_boot_secondary,
241 .smp_setup = ip27_smp_setup,
242 .prepare_cpus = ip27_prepare_cpus,