1 files changed, 87 insertions, 0 deletions
diff --git a/arch/parisc/kernel/topology.c b/arch/parisc/kernel/topology.c
new file mode 100644
index 000000000..b9d845e31
--- /dev/null
+++ b/arch/parisc/kernel/topology.c
@@ -0,0 +1,87 @@
+/*
+ * arch/parisc/kernel/topology.c
+ *
+ * Copyright (C) 2017 Helge Deller <deller@gmx.de>
+ *
+ * based on arch/arm/kernel/topology.c
+ *
+ * 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.
+ */
+
+#include <linux/percpu.h>
+#include <linux/sched.h>
+#include <linux/sched/topology.h>
+#include <linux/cpu.h>
+
+#include <asm/topology.h>
+#include <asm/sections.h>
+
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+/*
+ * store_cpu_topology is called at boot when only one cpu is running
+ * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
+ * which prevents simultaneous write access to cpu_topology array
+ */
+void store_cpu_topology(unsigned int cpuid)
+{
+	struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
+	struct cpuinfo_parisc *p;
+	int max_socket = -1;
+	unsigned long cpu;
+
+	/* If the cpu topology has been already set, just return */
+	if (cpuid_topo->core_id != -1)
+		return;
+
+#ifdef CONFIG_HOTPLUG_CPU
+	per_cpu(cpu_devices, cpuid).hotpluggable = 1;
+#endif
+	if (register_cpu(&per_cpu(cpu_devices, cpuid), cpuid))
+		pr_warn("Failed to register CPU%d device", cpuid);
+
+	/* create cpu topology mapping */
+	cpuid_topo->thread_id = -1;
+	cpuid_topo->core_id = 0;
+
+	p = &per_cpu(cpu_data, cpuid);
+	for_each_online_cpu(cpu) {
+		const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
+
+		if (cpu == cpuid) /* ignore current cpu */
+			continue;
+
+		if (cpuinfo->cpu_loc == p->cpu_loc) {
+			cpuid_topo->core_id = cpu_topology[cpu].core_id;
+			if (p->cpu_loc) {
+				cpuid_topo->core_id++;
+				cpuid_topo->package_id = cpu_topology[cpu].package_id;
+				continue;
+			}
+		}
+
+		if (cpuid_topo->package_id == -1)
+			max_socket = max(max_socket, cpu_topology[cpu].package_id);
+	}
+
+	if (cpuid_topo->package_id == -1)
+		cpuid_topo->package_id = max_socket + 1;
+
+	update_siblings_masks(cpuid);
+
+	pr_info("CPU%u: cpu core %d of socket %d\n",
+		cpuid,
+		cpu_topology[cpuid].core_id,
+		cpu_topology[cpuid].package_id);
+}
+
+/*
+ * init_cpu_topology is called at boot when only one cpu is running
+ * which prevent simultaneous write access to cpu_topology array
+ */
+void __init init_cpu_topology(void)
+{
+	reset_cpu_topology();
+}