ip27-smp.c

  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/sched/task_stack.h>
 12#include <linux/topology.h>
 13#include <linux/nodemask.h>
 14
 15#include <asm/page.h>
 16#include <asm/processor.h>
 17#include <asm/ptrace.h>
 18#include <asm/sn/agent.h>
 19#include <asm/sn/arch.h>
 20#include <asm/sn/gda.h>
 21#include <asm/sn/intr.h>
 22#include <asm/sn/klconfig.h>
 23#include <asm/sn/launch.h>
 24#include <asm/sn/mapped_kernel.h>
 25#include <asm/sn/types.h>
 26
 27#include "ip27-common.h"
 28
 29static int node_scan_cpus(nasid_t nasid, int highest)
 30{
 31	static int cpus_found;
 32	lboard_t *brd;
 33	klcpu_t *acpu;
 34	cpuid_t cpuid;
 35
 36	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
 37
 38	do {
 39		acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
 40		while (acpu) {
 41			cpuid = acpu->cpu_info.virtid;
 42			/* Only let it join in if it's marked enabled */
 43			if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
 44			    (cpus_found != NR_CPUS)) {
 45				if (cpuid > highest)
 46					highest = cpuid;
 47				set_cpu_possible(cpuid, true);
 48				cputonasid(cpus_found) = nasid;
 49				cputoslice(cpus_found) = acpu->cpu_info.physid;
 50				sn_cpu_info[cpus_found].p_speed =
 51							acpu->cpu_speed;
 52				cpus_found++;
 53			}
 54			acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
 55								KLSTRUCT_CPU);
 56		}
 57		brd = KLCF_NEXT(brd);
 58		if (!brd)
 59			break;
 60
 61		brd = find_lboard(brd, KLTYPE_IP27);
 62	} while (brd);
 63
 64	return highest;
 65}
 66
 67void cpu_node_probe(void)
 68{
 69	int i, highest = 0;
 70	gda_t *gdap = GDA;
 71
 72	nodes_clear(node_online_map);
 73	nodes_clear(node_possible_map);
 74	for (i = 0; i < MAX_NUMNODES; i++) {
 75		nasid_t nasid = gdap->g_nasidtable[i];
 76		if (nasid == INVALID_NASID)
 77			break;
 78		node_set_online(nasid);
 79		node_set(nasid, node_possible_map);
 80		highest = node_scan_cpus(nasid, highest);
 81	}
 82
 83	printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
 84}
 85
 86static __init void intr_clear_all(nasid_t nasid)
 87{
 88	int i;
 89
 90	REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
 91	REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
 92	REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
 93	REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
 94
 95	for (i = 0; i < 128; i++)
 96		REMOTE_HUB_CLR_INTR(nasid, i);
 97}
 98
 99static void ip27_send_ipi_single(int destid, unsigned int action)
100{
101	int irq;
102
103	switch (action) {
104	case SMP_RESCHEDULE_YOURSELF:
105		irq = CPU_RESCHED_A_IRQ;
106		break;
107	case SMP_CALL_FUNCTION:
108		irq = CPU_CALL_A_IRQ;
109		break;
110	default:
111		panic("sendintr");
112	}
113
114	irq += cputoslice(destid);
115
116	/*
117	 * Set the interrupt bit associated with the CPU we want to
118	 * send the interrupt to.
119	 */
120	REMOTE_HUB_SEND_INTR(cpu_to_node(destid), irq);
121}
122
123static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
124{
125	unsigned int i;
126
127	for_each_cpu(i, mask)
128		ip27_send_ipi_single(i, action);
129}
130
131static void ip27_init_cpu(void)
132{
133	per_cpu_init();
134}
135
136static void ip27_smp_finish(void)
137{
138	hub_rt_clock_event_init();
139	local_irq_enable();
140}
141
142/*
143 * Launch a slave into smp_bootstrap().	 It doesn't take an argument, and we
144 * set sp to the kernel stack of the newly created idle process, gp to the proc
145 * struct so that current_thread_info() will work.
146 */
147static int ip27_boot_secondary(int cpu, struct task_struct *idle)
148{
149	unsigned long gp = (unsigned long)task_thread_info(idle);
150	unsigned long sp = __KSTK_TOS(idle);
151
152	LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
153		(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
154		0, (void *) sp, (void *) gp);
155	return 0;
156}
157
158static void __init ip27_smp_setup(void)
159{
160	nasid_t nasid;
161
162	for_each_online_node(nasid) {
163		if (nasid == 0)
164			continue;
165		intr_clear_all(nasid);
166	}
167
168	replicate_kernel_text();
169
170	/*
171	 * PROM sets up system, that boot cpu is always first CPU on nasid 0
172	 */
173	cputonasid(0) = 0;
174	cputoslice(0) = LOCAL_HUB_L(PI_CPU_NUM);
175}
176
177static void __init ip27_prepare_cpus(unsigned int max_cpus)
178{
179	/* We already did everything necessary earlier */
180}
181
182const struct plat_smp_ops ip27_smp_ops = {
183	.send_ipi_single	= ip27_send_ipi_single,
184	.send_ipi_mask		= ip27_send_ipi_mask,
185	.init_secondary		= ip27_init_cpu,
186	.smp_finish		= ip27_smp_finish,
187	.boot_secondary		= ip27_boot_secondary,
188	.smp_setup		= ip27_smp_setup,
189	.prepare_cpus		= ip27_prepare_cpus,
190	.prepare_boot_cpu	= ip27_init_cpu,
191};