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 ps3_smp_message_pass(int cpu, 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, cpu)[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__, cpu, msg, result);
  58 }
  59
  60 static int ps3_smp_probe(void)
  61 {
  62         int cpu;
  63
  64         for (cpu = 0; cpu < 2; cpu++) {
  65                 int result;
  66                 unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
  67                 int i;
  68
  69                 DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
  70
  71                 /*
  72                 * Check assumptions on ps3_ipi_virqs[] indexing. If this
  73                 * check fails, then a different mapping of PPC_MSG_
  74                 * to index needs to be setup.
  75                 */
  76
  77                 BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION    != 0);
  78                 BUILD_BUG_ON(PPC_MSG_RESCHEDULE       != 1);
  79                 BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
  80                 BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK   != 3);
  81
  82                 for (i = 0; i < MSG_COUNT; i++) {
  83                         result = ps3_event_receive_port_setup(cpu, &virqs[i]);
  84
  85                         if (result)
  86                                 continue;
  87
  88                         DBG("%s:%d: (%d, %d) => virq %u\n",
  89                                 __func__, __LINE__, cpu, i, virqs[i]);
  90
  91                         result = smp_request_message_ipi(virqs[i], i);
  92
  93                         if (result)
  94                                 virqs[i] = NO_IRQ;
  95                         else
  96                                 ps3_register_ipi_irq(cpu, virqs[i]);
  97                 }
  98
  99                 ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
 100
 101                 DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
 102         }
 103
 104         return 2;
 105 }
 106
 107 void ps3_smp_cleanup_cpu(int cpu)
 108 {
 109         unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
 110         int i;
 111
 112         DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
 113
 114         for (i = 0; i < MSG_COUNT; i++) {
 115                 /* Can't call free_irq from interrupt context. */
 116                 ps3_event_receive_port_destroy(virqs[i]);
 117                 virqs[i] = NO_IRQ;
 118         }
 119
 120         DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
 121 }
 122
 123 static struct smp_ops_t ps3_smp_ops = {
 124         .probe          = ps3_smp_probe,
 125         .message_pass   = ps3_smp_message_pass,
 126         .kick_cpu       = smp_generic_kick_cpu,
 127 };
 128
 129 void smp_init_ps3(void)
 130 {
 131         DBG(" -> %s\n", __func__);
 132         smp_ops = &ps3_smp_ops;
 133         DBG(" <- %s\n", __func__);
 134 }