Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 000000000..5d2652a1d
--- /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,
+};