1 /* smp.c: Sparc SMP support.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
4 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/threads.h>
13 #include <linux/smp.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/init.h>
17 #include <linux/spinlock.h>
20 #include <linux/seq_file.h>
21 #include <linux/cache.h>
22 #include <linux/delay.h>
24 #include <asm/ptrace.h>
25 #include <linux/atomic.h>
29 #include <asm/pgalloc.h>
30 #include <asm/pgtable.h>
31 #include <asm/oplib.h>
32 #include <asm/cacheflush.h>
33 #include <asm/tlbflush.h>
34 #include <asm/cpudata.h>
39 volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,};
41 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
43 const struct sparc32_ipi_ops *sparc32_ipi_ops;
45 /* The only guaranteed locking primitive available on all Sparc
46 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
47 * places the current byte at the effective address into dest_reg and
48 * places 0xff there afterwards. Pretty lame locking primitive
49 * compared to the Alpha and the Intel no? Most Sparcs have 'swap'
50 * instruction which is much better...
53 void __cpuinit smp_store_cpu_info(int id)
58 cpu_data(id).udelay_val = loops_per_jiffy;
60 cpu_find_by_mid(id, &cpu_node);
61 cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
62 "clock-frequency", 0);
63 cpu_data(id).prom_node = cpu_node;
64 mid = cpu_get_hwmid(cpu_node);
67 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08d", id, cpu_node);
70 cpu_data(id).mid = mid;
73 void __init smp_cpus_done(unsigned int max_cpus)
75 extern void smp4m_smp_done(void);
76 extern void smp4d_smp_done(void);
77 unsigned long bogosum = 0;
80 for_each_online_cpu(cpu) {
82 bogosum += cpu_data(cpu).udelay_val;
85 printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
86 num, bogosum/(500000/HZ),
87 (bogosum/(5000/HZ))%100);
89 switch(sparc_cpu_model) {
108 printk("UNKNOWN!\n");
116 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
117 panic("SMP bolixed\n");
120 struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 };
122 void smp_send_reschedule(int cpu)
125 * CPU model dependent way of implementing IPI generation targeting
126 * a single CPU. The trap handler needs only to do trap entry/return
129 sparc32_ipi_ops->resched(cpu);
132 void smp_send_stop(void)
136 void arch_send_call_function_single_ipi(int cpu)
138 /* trigger one IPI single call on one CPU */
139 sparc32_ipi_ops->single(cpu);
142 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
146 /* trigger IPI mask call on each CPU */
147 for_each_cpu(cpu, mask)
148 sparc32_ipi_ops->mask_one(cpu);
151 void smp_resched_interrupt(void)
155 local_cpu_data().irq_resched_count++;
157 /* re-schedule routine called by interrupt return code. */
160 void smp_call_function_single_interrupt(void)
163 generic_smp_call_function_single_interrupt();
164 local_cpu_data().irq_call_count++;
168 void smp_call_function_interrupt(void)
171 generic_smp_call_function_interrupt();
172 local_cpu_data().irq_call_count++;
176 int setup_profiling_timer(unsigned int multiplier)
181 void __init smp_prepare_cpus(unsigned int max_cpus)
183 extern void __init smp4m_boot_cpus(void);
184 extern void __init smp4d_boot_cpus(void);
187 printk("Entering SMP Mode...\n");
190 for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
191 if (cpuid >= NR_CPUS)
194 /* i = number of cpus */
195 if (extra && max_cpus > i - extra)
196 printk("Warning: NR_CPUS is too low to start all cpus\n");
198 smp_store_cpu_info(boot_cpu_id);
200 switch(sparc_cpu_model) {
219 printk("UNKNOWN!\n");
225 /* Set this up early so that things like the scheduler can init
226 * properly. We use the same cpu mask for both the present and
229 void __init smp_setup_cpu_possible_map(void)
234 while (!cpu_find_by_instance(instance, NULL, &mid)) {
236 set_cpu_possible(mid, true);
237 set_cpu_present(mid, true);
243 void __init smp_prepare_boot_cpu(void)
245 int cpuid = hard_smp_processor_id();
247 if (cpuid >= NR_CPUS) {
248 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
252 printk("boot cpu id != 0, this could work but is untested\n");
254 current_thread_info()->cpu = cpuid;
255 set_cpu_online(cpuid, true);
256 set_cpu_possible(cpuid, true);
259 int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
261 extern int __cpuinit smp4m_boot_one_cpu(int, struct task_struct *);
262 extern int __cpuinit smp4d_boot_one_cpu(int, struct task_struct *);
265 switch(sparc_cpu_model) {
267 ret = smp4m_boot_one_cpu(cpu, tidle);
270 ret = smp4d_boot_one_cpu(cpu, tidle);
273 ret = leon_boot_one_cpu(cpu, tidle);
284 printk("UNKNOWN!\n");
290 cpumask_set_cpu(cpu, &smp_commenced_mask);
291 while (!cpu_online(cpu))
297 void smp_bogo(struct seq_file *m)
301 for_each_online_cpu(i) {
303 "Cpu%dBogo\t: %lu.%02lu\n",
305 cpu_data(i).udelay_val/(500000/HZ),
306 (cpu_data(i).udelay_val/(5000/HZ))%100);
310 void smp_info(struct seq_file *m)
314 seq_printf(m, "State:\n");
315 for_each_online_cpu(i)
316 seq_printf(m, "CPU%d\t\t: online\n", i);