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Linux/arch/powerpc/platforms/cell/smp.c

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  1 /*
  2  * SMP support for BPA machines.
  3  *
  4  * Dave Engebretsen, Peter Bergner, and
  5  * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
  6  *
  7  * Plus various changes from other IBM teams...
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 #undef DEBUG
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/sched.h>
 20 #include <linux/smp.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/delay.h>
 23 #include <linux/init.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/cache.h>
 26 #include <linux/err.h>
 27 #include <linux/sysdev.h>
 28 #include <linux/cpu.h>
 29 
 30 #include <asm/ptrace.h>
 31 #include <asm/atomic.h>
 32 #include <asm/irq.h>
 33 #include <asm/page.h>
 34 #include <asm/pgtable.h>
 35 #include <asm/io.h>
 36 #include <asm/prom.h>
 37 #include <asm/smp.h>
 38 #include <asm/paca.h>
 39 #include <asm/machdep.h>
 40 #include <asm/cputable.h>
 41 #include <asm/firmware.h>
 42 #include <asm/system.h>
 43 #include <asm/rtas.h>
 44 #include <asm/cputhreads.h>
 45 
 46 #include "interrupt.h"
 47 #include <asm/udbg.h>
 48 
 49 #ifdef DEBUG
 50 #define DBG(fmt...) udbg_printf(fmt)
 51 #else
 52 #define DBG(fmt...)
 53 #endif
 54 
 55 /*
 56  * The Primary thread of each non-boot processor was started from the OF client
 57  * interface by prom_hold_cpus and is spinning on secondary_hold_spinloop.
 58  */
 59 static cpumask_t of_spin_map;
 60 
 61 /**
 62  * smp_startup_cpu() - start the given cpu
 63  *
 64  * At boot time, there is nothing to do for primary threads which were
 65  * started from Open Firmware.  For anything else, call RTAS with the
 66  * appropriate start location.
 67  *
 68  * Returns:
 69  *      0       - failure
 70  *      1       - success
 71  */
 72 static inline int __devinit smp_startup_cpu(unsigned int lcpu)
 73 {
 74         int status;
 75         unsigned long start_here = __pa((u32)*((unsigned long *)
 76                                                generic_secondary_smp_init));
 77         unsigned int pcpu;
 78         int start_cpu;
 79 
 80         if (cpumask_test_cpu(lcpu, &of_spin_map))
 81                 /* Already started by OF and sitting in spin loop */
 82                 return 1;
 83 
 84         pcpu = get_hard_smp_processor_id(lcpu);
 85 
 86         /* Fixup atomic count: it exited inside IRQ handler. */
 87         task_thread_info(paca[lcpu].__current)->preempt_count   = 0;
 88 
 89         /*
 90          * If the RTAS start-cpu token does not exist then presume the
 91          * cpu is already spinning.
 92          */
 93         start_cpu = rtas_token("start-cpu");
 94         if (start_cpu == RTAS_UNKNOWN_SERVICE)
 95                 return 1;
 96 
 97         status = rtas_call(start_cpu, 3, 1, NULL, pcpu, start_here, lcpu);
 98         if (status != 0) {
 99                 printk(KERN_ERR "start-cpu failed: %i\n", status);
100                 return 0;
101         }
102 
103         return 1;
104 }
105 
106 static int __init smp_iic_probe(void)
107 {
108         iic_request_IPIs();
109 
110         return cpumask_weight(cpu_possible_mask);
111 }
112 
113 static void __devinit smp_cell_setup_cpu(int cpu)
114 {
115         if (cpu != boot_cpuid)
116                 iic_setup_cpu();
117 
118         /*
119          * change default DABRX to allow user watchpoints
120          */
121         mtspr(SPRN_DABRX, DABRX_KERNEL | DABRX_USER);
122 }
123 
124 static int __devinit smp_cell_kick_cpu(int nr)
125 {
126         BUG_ON(nr < 0 || nr >= NR_CPUS);
127 
128         if (!smp_startup_cpu(nr))
129                 return -ENOENT;
130 
131         /*
132          * The processor is currently spinning, waiting for the
133          * cpu_start field to become non-zero After we set cpu_start,
134          * the processor will continue on to secondary_start
135          */
136         paca[nr].cpu_start = 1;
137 
138         return 0;
139 }
140 
141 static int smp_cell_cpu_bootable(unsigned int nr)
142 {
143         /* Special case - we inhibit secondary thread startup
144          * during boot if the user requests it.  Odd-numbered
145          * cpus are assumed to be secondary threads.
146          */
147         if (system_state < SYSTEM_RUNNING &&
148             cpu_has_feature(CPU_FTR_SMT) &&
149             !smt_enabled_at_boot && cpu_thread_in_core(nr) != 0)
150                 return 0;
151 
152         return 1;
153 }
154 static struct smp_ops_t bpa_iic_smp_ops = {
155         .message_pass   = iic_message_pass,
156         .probe          = smp_iic_probe,
157         .kick_cpu       = smp_cell_kick_cpu,
158         .setup_cpu      = smp_cell_setup_cpu,
159         .cpu_bootable   = smp_cell_cpu_bootable,
160 };
161 
162 /* This is called very early */
163 void __init smp_init_cell(void)
164 {
165         int i;
166 
167         DBG(" -> smp_init_cell()\n");
168 
169         smp_ops = &bpa_iic_smp_ops;
170 
171         /* Mark threads which are still spinning in hold loops. */
172         if (cpu_has_feature(CPU_FTR_SMT)) {
173                 for_each_present_cpu(i) {
174                         if (cpu_thread_in_core(i) == 0)
175                                 cpumask_set_cpu(i, &of_spin_map);
176                 }
177         } else
178                 cpumask_copy(&of_spin_map, cpu_present_mask);
179 
180         cpumask_clear_cpu(boot_cpuid, &of_spin_map);
181 
182         /* Non-lpar has additional take/give timebase */
183         if (rtas_token("freeze-time-base") != RTAS_UNKNOWN_SERVICE) {
184                 smp_ops->give_timebase = rtas_give_timebase;
185                 smp_ops->take_timebase = rtas_take_timebase;
186         }
187 
188         DBG(" <- smp_init_cell()\n");
189 }
190 

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