arch/mips/sgi-ip27/ip27-smp.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General
   3  * Public License.  See the file "COPYING" in the main directory of this
   4  * archive for more details.
   5  *
   6  * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
   7  * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
   8  */
   9 #include <linux/init.h>
  10 #include <linux/sched.h>
  11 #include <linux/topology.h>
  12 #include <linux/nodemask.h>
  13 #include <asm/page.h>
  14 #include <asm/processor.h>
  15 #include <asm/sn/arch.h>
  16 #include <asm/sn/gda.h>
  17 #include <asm/sn/intr.h>
  18 #include <asm/sn/klconfig.h>
  19 #include <asm/sn/launch.h>
  20 #include <asm/sn/mapped_kernel.h>
  21 #include <asm/sn/sn_private.h>
  22 #include <asm/sn/types.h>
  23 #include <asm/sn/sn0/hubpi.h>
  24 #include <asm/sn/sn0/hubio.h>
  25 #include <asm/sn/sn0/ip27.h>
  26
  27 /*
  28  * Takes as first input the PROM assigned cpu id, and the kernel
  29  * assigned cpu id as the second.
  30  */
  31 static void alloc_cpupda(cpuid_t cpu, int cpunum)
  32 {
  33         cnodeid_t node = get_cpu_cnode(cpu);
  34         nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
  35
  36         cputonasid(cpunum) = nasid;
  37         sn_cpu_info[cpunum].p_nodeid = node;
  38         cputoslice(cpunum) = get_cpu_slice(cpu);
  39 }
  40
  41 static nasid_t get_actual_nasid(lboard_t *brd)
  42 {
  43         klhub_t *hub;
  44
  45         if (!brd)
  46                 return INVALID_NASID;
  47
  48         /* find out if we are a completely disabled brd. */
  49         hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
  50         if (!hub)
  51                 return INVALID_NASID;
  52         if (!(hub->hub_info.flags & KLINFO_ENABLE))     /* disabled node brd */
  53                 return hub->hub_info.physid;
  54         else
  55                 return brd->brd_nasid;
  56 }
  57
  58 static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
  59 {
  60         static int tot_cpus_found = 0;
  61         lboard_t *brd;
  62         klcpu_t *acpu;
  63         int cpus_found = 0;
  64         cpuid_t cpuid;
  65
  66         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
  67
  68         do {
  69                 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
  70                 while (acpu) {
  71                         cpuid = acpu->cpu_info.virtid;
  72                         /* cnode is not valid for completely disabled brds */
  73                         if (get_actual_nasid(brd) == brd->brd_nasid)
  74                                 cpuid_to_compact_node[cpuid] = cnode;
  75                         if (cpuid > highest)
  76                                 highest = cpuid;
  77                         /* Only let it join in if it's marked enabled */
  78                         if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
  79                             (tot_cpus_found != NR_CPUS)) {
  80                                 set_cpu_possible(cpuid, true);
  81                                 alloc_cpupda(cpuid, tot_cpus_found);
  82                                 cpus_found++;
  83                                 tot_cpus_found++;
  84                         }
  85                         acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
  86                                                                 KLSTRUCT_CPU);
  87                 }
  88                 brd = KLCF_NEXT(brd);
  89                 if (!brd)
  90                         break;
  91
  92                 brd = find_lboard(brd, KLTYPE_IP27);
  93         } while (brd);
  94
  95         return highest;
  96 }
  97
  98 void cpu_node_probe(void)
  99 {
 100         int i, highest = 0;
 101         gda_t *gdap = GDA;
 102
 103         /*
 104          * Initialize the arrays to invalid nodeid (-1)
 105          */
 106         for (i = 0; i < MAX_COMPACT_NODES; i++)
 107                 compact_to_nasid_node[i] = INVALID_NASID;
 108         for (i = 0; i < MAX_NASIDS; i++)
 109                 nasid_to_compact_node[i] = INVALID_CNODEID;
 110         for (i = 0; i < MAXCPUS; i++)
 111                 cpuid_to_compact_node[i] = INVALID_CNODEID;
 112
 113         /*
 114          * MCD - this whole "compact node" stuff can probably be dropped,
 115          * as we can handle sparse numbering now
 116          */
 117         nodes_clear(node_online_map);
 118         for (i = 0; i < MAX_COMPACT_NODES; i++) {
 119                 nasid_t nasid = gdap->g_nasidtable[i];
 120                 if (nasid == INVALID_NASID)
 121                         break;
 122                 compact_to_nasid_node[i] = nasid;
 123                 nasid_to_compact_node[nasid] = i;
 124                 node_set_online(num_online_nodes());
 125                 highest = do_cpumask(i, nasid, highest);
 126         }
 127
 128         printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
 129 }
 130
 131 static __init void intr_clear_all(nasid_t nasid)
 132 {
 133         int i;
 134
 135         REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
 136         REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
 137         REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
 138         REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
 139
 140         for (i = 0; i < 128; i++)
 141                 REMOTE_HUB_CLR_INTR(nasid, i);
 142 }
 143
 144 static void ip27_send_ipi_single(int destid, unsigned int action)
 145 {
 146         int irq;
 147
 148         switch (action) {
 149         case SMP_RESCHEDULE_YOURSELF:
 150                 irq = CPU_RESCHED_A_IRQ;
 151                 break;
 152         case SMP_CALL_FUNCTION:
 153                 irq = CPU_CALL_A_IRQ;
 154                 break;
 155         default:
 156                 panic("sendintr");
 157         }
 158
 159         irq += cputoslice(destid);
 160
 161         /*
 162          * Convert the compact hub number to the NASID to get the correct
 163          * part of the address space.  Then set the interrupt bit associated
 164          * with the CPU we want to send the interrupt to.
 165          */
 166         REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
 167 }
 168
 169 static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 170 {
 171         unsigned int i;
 172
 173         for_each_cpu(i, mask)
 174                 ip27_send_ipi_single(i, action);
 175 }
 176
 177 static void ip27_init_secondary(void)
 178 {
 179         per_cpu_init();
 180 }
 181
 182 static void ip27_smp_finish(void)
 183 {
 184         extern void hub_rt_clock_event_init(void);
 185
 186         hub_rt_clock_event_init();
 187         local_irq_enable();
 188 }
 189
 190 /*
 191  * Launch a slave into smp_bootstrap().  It doesn't take an argument, and we
 192  * set sp to the kernel stack of the newly created idle process, gp to the proc
 193  * struct so that current_thread_info() will work.
 194  */
 195 static void ip27_boot_secondary(int cpu, struct task_struct *idle)
 196 {
 197         unsigned long gp = (unsigned long)task_thread_info(idle);
 198         unsigned long sp = __KSTK_TOS(idle);
 199
 200         LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
 201                 (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
 202                 0, (void *) sp, (void *) gp);
 203 }
 204
 205 static void __init ip27_smp_setup(void)
 206 {
 207         cnodeid_t       cnode;
 208
 209         for_each_online_node(cnode) {
 210                 if (cnode == 0)
 211                         continue;
 212                 intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
 213         }
 214
 215         replicate_kernel_text();
 216
 217         /*
 218          * Assumption to be fixed: we're always booted on logical / physical
 219          * processor 0.  While we're always running on logical processor 0
 220          * this still means this is physical processor zero; it might for
 221          * example be disabled in the firmware.
 222          */
 223         alloc_cpupda(0, 0);
 224 }
 225
 226 static void __init ip27_prepare_cpus(unsigned int max_cpus)
 227 {
 228         /* We already did everything necessary earlier */
 229 }
 230
 231 struct plat_smp_ops ip27_smp_ops = {
 232         .send_ipi_single        = ip27_send_ipi_single,
 233         .send_ipi_mask          = ip27_send_ipi_mask,
 234         .init_secondary         = ip27_init_secondary,
 235         .smp_finish             = ip27_smp_finish,
 236         .boot_secondary         = ip27_boot_secondary,
 237         .smp_setup              = ip27_smp_setup,
 238         .prepare_cpus           = ip27_prepare_cpus,
 239 };