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/nodemask.h>
  12 #include <asm/page.h>
  13 #include <asm/processor.h>
  14 #include <asm/sn/arch.h>
  15 #include <asm/sn/gda.h>
  16 #include <asm/sn/intr.h>
  17 #include <asm/sn/klconfig.h>
  18 #include <asm/sn/launch.h>
  19 #include <asm/sn/mapped_kernel.h>
  20 #include <asm/sn/sn_private.h>
  21 #include <asm/sn/types.h>
  22 #include <asm/sn/sn0/hubpi.h>
  23 #include <asm/sn/sn0/hubio.h>
  24 #include <asm/sn/sn0/ip27.h>
  25
  26 /*
  27  * Takes as first input the PROM assigned cpu id, and the kernel
  28  * assigned cpu id as the second.
  29  */
  30 static void alloc_cpupda(cpuid_t cpu, int cpunum)
  31 {
  32         cnodeid_t node = get_cpu_cnode(cpu);
  33         nasid_t nasid = COMPACT_TO_NASID_NODEID(node);
  34
  35         cputonasid(cpunum) = nasid;
  36         sn_cpu_info[cpunum].p_nodeid = node;
  37         cputoslice(cpunum) = get_cpu_slice(cpu);
  38 }
  39
  40 static nasid_t get_actual_nasid(lboard_t *brd)
  41 {
  42         klhub_t *hub;
  43
  44         if (!brd)
  45                 return INVALID_NASID;
  46
  47         /* find out if we are a completely disabled brd. */
  48         hub  = (klhub_t *)find_first_component(brd, KLSTRUCT_HUB);
  49         if (!hub)
  50                 return INVALID_NASID;
  51         if (!(hub->hub_info.flags & KLINFO_ENABLE))     /* disabled node brd */
  52                 return hub->hub_info.physid;
  53         else
  54                 return brd->brd_nasid;
  55 }
  56
  57 static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
  58 {
  59         static int tot_cpus_found = 0;
  60         lboard_t *brd;
  61         klcpu_t *acpu;
  62         int cpus_found = 0;
  63         cpuid_t cpuid;
  64
  65         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
  66
  67         do {
  68                 acpu = (klcpu_t *)find_first_component(brd, KLSTRUCT_CPU);
  69                 while (acpu) {
  70                         cpuid = acpu->cpu_info.virtid;
  71                         /* cnode is not valid for completely disabled brds */
  72                         if (get_actual_nasid(brd) == brd->brd_nasid)
  73                                 cpuid_to_compact_node[cpuid] = cnode;
  74                         if (cpuid > highest)
  75                                 highest = cpuid;
  76                         /* Only let it join in if it's marked enabled */
  77                         if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
  78                             (tot_cpus_found != NR_CPUS)) {
  79                                 set_cpu_possible(cpuid, true);
  80                                 alloc_cpupda(cpuid, tot_cpus_found);
  81                                 cpus_found++;
  82                                 tot_cpus_found++;
  83                         }
  84                         acpu = (klcpu_t *)find_component(brd, (klinfo_t *)acpu,
  85                                                                 KLSTRUCT_CPU);
  86                 }
  87                 brd = KLCF_NEXT(brd);
  88                 if (!brd)
  89                         break;
  90
  91                 brd = find_lboard(brd, KLTYPE_IP27);
  92         } while (brd);
  93
  94         return highest;
  95 }
  96
  97 void cpu_node_probe(void)
  98 {
  99         int i, highest = 0;
 100         gda_t *gdap = GDA;
 101
 102         /*
 103          * Initialize the arrays to invalid nodeid (-1)
 104          */
 105         for (i = 0; i < MAX_COMPACT_NODES; i++)
 106                 compact_to_nasid_node[i] = INVALID_NASID;
 107         for (i = 0; i < MAX_NASIDS; i++)
 108                 nasid_to_compact_node[i] = INVALID_CNODEID;
 109         for (i = 0; i < MAXCPUS; i++)
 110                 cpuid_to_compact_node[i] = INVALID_CNODEID;
 111
 112         /*
 113          * MCD - this whole "compact node" stuff can probably be dropped,
 114          * as we can handle sparse numbering now
 115          */
 116         nodes_clear(node_online_map);
 117         for (i = 0; i < MAX_COMPACT_NODES; i++) {
 118                 nasid_t nasid = gdap->g_nasidtable[i];
 119                 if (nasid == INVALID_NASID)
 120                         break;
 121                 compact_to_nasid_node[i] = nasid;
 122                 nasid_to_compact_node[nasid] = i;
 123                 node_set_online(num_online_nodes());
 124                 highest = do_cpumask(i, nasid, highest);
 125         }
 126
 127         printk("Discovered %d cpus on %d nodes\n", highest + 1, num_online_nodes());
 128 }
 129
 130 static __init void intr_clear_all(nasid_t nasid)
 131 {
 132         int i;
 133
 134         REMOTE_HUB_S(nasid, PI_INT_MASK0_A, 0);
 135         REMOTE_HUB_S(nasid, PI_INT_MASK0_B, 0);
 136         REMOTE_HUB_S(nasid, PI_INT_MASK1_A, 0);
 137         REMOTE_HUB_S(nasid, PI_INT_MASK1_B, 0);
 138
 139         for (i = 0; i < 128; i++)
 140                 REMOTE_HUB_CLR_INTR(nasid, i);
 141 }
 142
 143 static void ip27_send_ipi_single(int destid, unsigned int action)
 144 {
 145         int irq;
 146
 147         switch (action) {
 148         case SMP_RESCHEDULE_YOURSELF:
 149                 irq = CPU_RESCHED_A_IRQ;
 150                 break;
 151         case SMP_CALL_FUNCTION:
 152                 irq = CPU_CALL_A_IRQ;
 153                 break;
 154         default:
 155                 panic("sendintr");
 156         }
 157
 158         irq += cputoslice(destid);
 159
 160         /*
 161          * Convert the compact hub number to the NASID to get the correct
 162          * part of the address space.  Then set the interrupt bit associated
 163          * with the CPU we want to send the interrupt to.
 164          */
 165         REMOTE_HUB_SEND_INTR(COMPACT_TO_NASID_NODEID(cpu_to_node(destid)), irq);
 166 }
 167
 168 static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 169 {
 170         unsigned int i;
 171
 172         for_each_cpu(i, mask)
 173                 ip27_send_ipi_single(i, action);
 174 }
 175
 176 static void __cpuinit ip27_init_secondary(void)
 177 {
 178         per_cpu_init();
 179 }
 180
 181 static void __cpuinit ip27_smp_finish(void)
 182 {
 183         extern void hub_rt_clock_event_init(void);
 184
 185         hub_rt_clock_event_init();
 186         local_irq_enable();
 187 }
 188
 189 static void __init ip27_cpus_done(void)
 190 {
 191 }
 192
 193 /*
 194  * Launch a slave into smp_bootstrap().  It doesn't take an argument, and we
 195  * set sp to the kernel stack of the newly created idle process, gp to the proc
 196  * struct so that current_thread_info() will work.
 197  */
 198 static void __cpuinit ip27_boot_secondary(int cpu, struct task_struct *idle)
 199 {
 200         unsigned long gp = (unsigned long)task_thread_info(idle);
 201         unsigned long sp = __KSTK_TOS(idle);
 202
 203         LAUNCH_SLAVE(cputonasid(cpu), cputoslice(cpu),
 204                 (launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
 205                 0, (void *) sp, (void *) gp);
 206 }
 207
 208 static void __init ip27_smp_setup(void)
 209 {
 210         cnodeid_t       cnode;
 211
 212         for_each_online_node(cnode) {
 213                 if (cnode == 0)
 214                         continue;
 215                 intr_clear_all(COMPACT_TO_NASID_NODEID(cnode));
 216         }
 217
 218         replicate_kernel_text();
 219
 220         /*
 221          * Assumption to be fixed: we're always booted on logical / physical
 222          * processor 0.  While we're always running on logical processor 0
 223          * this still means this is physical processor zero; it might for
 224          * example be disabled in the firmware.
 225          */
 226         alloc_cpupda(0, 0);
 227 }
 228
 229 static void __init ip27_prepare_cpus(unsigned int max_cpus)
 230 {
 231         /* We already did everything necessary earlier */
 232 }
 233
 234 struct plat_smp_ops ip27_smp_ops = {
 235         .send_ipi_single        = ip27_send_ipi_single,
 236         .send_ipi_mask          = ip27_send_ipi_mask,
 237         .init_secondary         = ip27_init_secondary,
 238         .smp_finish             = ip27_smp_finish,
 239         .cpus_done              = ip27_cpus_done,
 240         .boot_secondary         = ip27_boot_secondary,
 241         .smp_setup              = ip27_smp_setup,
 242         .prepare_cpus           = ip27_prepare_cpus,
 243 };