release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/platforms/ps3/smp.c

   1 /*
   2  *  PS3 SMP routines.
   3  *
   4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   5  *  Copyright 2006 Sony Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/smp.h>
  23
  24 #include <asm/machdep.h>
  25 #include <asm/udbg.h>
  26
  27 #include "platform.h"
  28
  29 #if defined(DEBUG)
  30 #define DBG udbg_printf
  31 #else
  32 #define DBG pr_debug
  33 #endif
  34
  35 /**
  36   * ps3_ipi_virqs - a per cpu array of virqs for ipi use
  37   */
  38
  39 #define MSG_COUNT 4
  40 static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs);
  41
  42 static void do_message_pass(int target, int msg)
  43 {
  44         int result;
  45         unsigned int virq;
  46
  47         if (msg >= MSG_COUNT) {
  48                 DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
  49                 return;
  50         }
  51
  52         virq = per_cpu(ps3_ipi_virqs, target)[msg];
  53         result = ps3_send_event_locally(virq);
  54
  55         if (result)
  56                 DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
  57                         " (%d)\n", __func__, __LINE__, target, msg, result);
  58 }
  59
  60 static void ps3_smp_message_pass(int target, int msg)
  61 {
  62         int cpu;
  63
  64         if (target < NR_CPUS)
  65                 do_message_pass(target, msg);
  66         else if (target == MSG_ALL_BUT_SELF) {
  67                 for_each_online_cpu(cpu)
  68                         if (cpu != smp_processor_id())
  69                                 do_message_pass(cpu, msg);
  70         } else {
  71                 for_each_online_cpu(cpu)
  72                         do_message_pass(cpu, msg);
  73         }
  74 }
  75
  76 static int ps3_smp_probe(void)
  77 {
  78         return 2;
  79 }
  80
  81 static void __init ps3_smp_setup_cpu(int cpu)
  82 {
  83         int result;
  84         unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
  85         int i;
  86
  87         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
  88
  89         /*
  90          * Check assumptions on ps3_ipi_virqs[] indexing. If this
  91          * check fails, then a different mapping of PPC_MSG_
  92          * to index needs to be setup.
  93          */
  94
  95         BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION    != 0);
  96         BUILD_BUG_ON(PPC_MSG_RESCHEDULE       != 1);
  97         BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
  98         BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK   != 3);
  99
 100         for (i = 0; i < MSG_COUNT; i++) {
 101                 result = ps3_event_receive_port_setup(cpu, &virqs[i]);
 102
 103                 if (result)
 104                         continue;
 105
 106                 DBG("%s:%d: (%d, %d) => virq %u\n",
 107                         __func__, __LINE__, cpu, i, virqs[i]);
 108
 109                 result = smp_request_message_ipi(virqs[i], i);
 110
 111                 if (result)
 112                         virqs[i] = NO_IRQ;
 113         }
 114
 115         ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
 116
 117         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
 118 }
 119
 120 void ps3_smp_cleanup_cpu(int cpu)
 121 {
 122         unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
 123         int i;
 124
 125         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
 126
 127         for (i = 0; i < MSG_COUNT; i++) {
 128                 /* Can't call free_irq from interrupt context. */
 129                 ps3_event_receive_port_destroy(virqs[i]);
 130                 virqs[i] = NO_IRQ;
 131         }
 132
 133         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
 134 }
 135
 136 static struct smp_ops_t ps3_smp_ops = {
 137         .probe          = ps3_smp_probe,
 138         .message_pass   = ps3_smp_message_pass,
 139         .kick_cpu       = smp_generic_kick_cpu,
 140         .setup_cpu      = ps3_smp_setup_cpu,
 141 };
 142
 143 void smp_init_ps3(void)
 144 {
 145         DBG(" -> %s\n", __func__);
 146         smp_ops = &ps3_smp_ops;
 147         DBG(" <- %s\n", __func__);
 148 }