1 files changed, 243 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 00000000..735b43bf
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-smp.c
@@ -0,0 +1,243 @@
+/*
+ * 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/nodemask.h>
+#include <asm/page.h>
+#include <asm/processor.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/sn_private.h>
+#include <asm/sn/types.h>
+#include <asm/sn/sn0/hubpi.h>
+#include <asm/sn/sn0/hubio.h>
+#include <asm/sn/sn0/ip27.h>
+
+/*
+ * Takes as first input the PROM assigned cpu id, and the kernel
+ * assigned cpu id as the second.
+ */
+static void alloc_cpupda(cpuid_t cpu, int cpunum)
+{
+	cnodeid_t node = get_cpu_cnode(cpu);
+	nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
+
+	cputonasid(cpunum) = nasid;
+	sn_cpu_info[cpunum].p_nodeid = node;
+	cputoslice(cpunum) = get_cpu_slice(cpu);
+}
+
+static nasid_t get_actual_nasid(lboard_t *brd)
+{
+	klhub_t *hub;
+
+	if (!brd)
+		return INVALID_NASID;
+
+	/* find out if we are a completely disabled brd. */
+	hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
+	if (!hub)
+		return INVALID_NASID;
+	if (!(hub->hub_info.flags & KLINFO_ENABLE))	/* disabled node brd */
+		return hub->hub_info.physid;
+	else
+		return brd->brd_nasid;
+}
+
+static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
+{
+	static int tot_cpus_found = 0;
+	lboard_t *brd;
+	klcpu_t *acpu;
+	int cpus_found = 0;
+	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;
+			/* cnode is not valid for completely disabled brds */
+			if (get_actual_nasid(brd) == brd->brd_nasid)
+				cpuid_to_compact_node[cpuid] = cnode;
+			if (cpuid > highest)
+				highest = cpuid;
+			/* Only let it join in if it's marked enabled */
+			if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
+			    (tot_cpus_found != NR_CPUS)) {
+				set_cpu_possible(cpuid, true);
+				alloc_cpupda(cpuid, tot_cpus_found);
+				cpus_found++;
+				tot_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;
+
+	/*
+	 * Initialize the arrays to invalid nodeid (-1)
+	 */
+	for (i = 0; i < MAX_COMPACT_NODES; i++)
+		compact_to_nasid_node[i] = INVALID_NASID;
+	for (i = 0; i < MAX_NASIDS; i++)
+		nasid_to_compact_node[i] = INVALID_CNODEID;
+	for (i = 0; i < MAXCPUS; i++)
+		cpuid_to_compact_node[i] = INVALID_CNODEID;
+
+	/*
+	 * MCD - this whole "compact node" stuff can probably be dropped,
+	 * as we can handle sparse numbering now
+	 */
+	nodes_clear(node_online_map);
+	for (i = 0; i < MAX_COMPACT_NODES; i++) {
+		nasid_t nasid = gdap->g_nasidtable[i];
+		if (nasid == INVALID_NASID)
+			break;
+		compact_to_nasid_node[i] = nasid;
+		nasid_to_compact_node[nasid] = i;
+		node_set_online(num_online_nodes());
+		highest = do_cpumask(i, 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);
+
+	/*
+	 * Convert the compact hub number to the NASID to get the correct
+	 * part of the address space.  Then set the interrupt bit associated
+	 * with the CPU we want to send the interrupt to.
+	 */
+	REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(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 __cpuinit ip27_init_secondary(void)
+{
+	per_cpu_init();
+}
+
+static void __cpuinit ip27_smp_finish(void)
+{
+	extern void hub_rt_clock_event_init(void);
+
+	hub_rt_clock_event_init();
+	local_irq_enable();
+}
+
+static void __init ip27_cpus_done(void)
+{
+}
+
+/*
+ * 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 void __cpuinit 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);
+}
+
+static void __init ip27_smp_setup(void)
+{
+	cnodeid_t	cnode;
+
+	for_each_online_node(cnode) {
+		if (cnode == 0)
+			continue;
+		intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
+	}
+
+	replicate_kernel_text();
+
+	/*
+	 * Assumption to be fixed: we're always booted on logical / physical
+	 * processor 0.  While we're always running on logical processor 0
+	 * this still means this is physical processor zero; it might for
+	 * example be disabled in the firmware.
+	 */
+	alloc_cpupda(0, 0);
+}
+
+static void __init ip27_prepare_cpus(unsigned int max_cpus)
+{
+	/* We already did everything necessary earlier */
+}
+
+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_secondary,
+	.smp_finish		= ip27_smp_finish,
+	.cpus_done		= ip27_cpus_done,
+	.boot_secondary		= ip27_boot_secondary,
+	.smp_setup		= ip27_smp_setup,
+	.prepare_cpus		= ip27_prepare_cpus,
+};