Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

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,
+};