summaryrefslogtreecommitdiffstats
path: root/arch/mips/sgi-ip27/ip27-smp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/sgi-ip27/ip27-smp.c')
-rw-r--r--arch/mips/sgi-ip27/ip27-smp.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip27/ip27-smp.c b/arch/mips/sgi-ip27/ip27-smp.c
new file mode 100644
index 0000000000..5d2652a1d3
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-smp.c
@@ -0,0 +1,189 @@
+/*
+ * 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,
+};