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ip27-smp.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.
 *
 * 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)) {
                        cpu_set(cpuid, phys_cpu_present_map);
                        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(cpumask_t mask, unsigned int action)
{
      unsigned int i;

      for_each_cpu_mask(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 firwware.
       */
      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,
};

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