429 lines
9.5 KiB
C
429 lines
9.5 KiB
C
/* smp.c: Sparc SMP support.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
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*/
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#include <asm/head.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/threads.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/cache.h>
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#include <linux/delay.h>
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#include <asm/ptrace.h>
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#include <asm/atomic.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/oplib.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/cpudata.h>
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int smp_num_cpus = 1;
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volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
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unsigned char boot_cpu_id = 0;
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unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
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int smp_activated = 0;
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volatile int __cpu_number_map[NR_CPUS];
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volatile int __cpu_logical_map[NR_CPUS];
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cpumask_t cpu_online_map = CPU_MASK_NONE;
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cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
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cpumask_t smp_commenced_mask = CPU_MASK_NONE;
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/* The only guaranteed locking primitive available on all Sparc
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* processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
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* places the current byte at the effective address into dest_reg and
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* places 0xff there afterwards. Pretty lame locking primitive
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* compared to the Alpha and the Intel no? Most Sparcs have 'swap'
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* instruction which is much better...
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*/
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/* Used to make bitops atomic */
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unsigned char bitops_spinlock = 0;
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void __cpuinit smp_store_cpu_info(int id)
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{
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int cpu_node;
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cpu_data(id).udelay_val = loops_per_jiffy;
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cpu_find_by_mid(id, &cpu_node);
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cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
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"clock-frequency", 0);
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cpu_data(id).prom_node = cpu_node;
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cpu_data(id).mid = cpu_get_hwmid(cpu_node);
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if (cpu_data(id).mid < 0)
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panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
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}
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void __init smp_cpus_done(unsigned int max_cpus)
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{
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extern void smp4m_smp_done(void);
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extern void smp4d_smp_done(void);
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unsigned long bogosum = 0;
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int cpu, num;
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for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
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if (cpu_online(cpu)) {
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num++;
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bogosum += cpu_data(cpu).udelay_val;
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}
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printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
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num, bogosum/(500000/HZ),
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(bogosum/(5000/HZ))%100);
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switch(sparc_cpu_model) {
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case sun4:
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printk("SUN4\n");
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BUG();
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break;
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case sun4c:
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printk("SUN4C\n");
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BUG();
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break;
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case sun4m:
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smp4m_smp_done();
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break;
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case sun4d:
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smp4d_smp_done();
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break;
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case sun4e:
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printk("SUN4E\n");
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BUG();
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break;
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case sun4u:
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printk("SUN4U\n");
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BUG();
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break;
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default:
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printk("UNKNOWN!\n");
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BUG();
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break;
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};
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}
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void cpu_panic(void)
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{
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printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
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panic("SMP bolixed\n");
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}
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struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
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void smp_send_reschedule(int cpu)
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{
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/* See sparc64 */
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}
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void smp_send_stop(void)
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{
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}
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void smp_flush_cache_all(void)
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{
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xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
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local_flush_cache_all();
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}
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void smp_flush_tlb_all(void)
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{
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xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
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local_flush_tlb_all();
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}
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void smp_flush_cache_mm(struct mm_struct *mm)
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{
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if(mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
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local_flush_cache_mm(mm);
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}
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}
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void smp_flush_tlb_mm(struct mm_struct *mm)
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{
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if(mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask)) {
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xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
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if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
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mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
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}
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local_flush_tlb_mm(mm);
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}
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}
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void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
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local_flush_cache_range(vma, start, end);
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}
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}
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void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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if (mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
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local_flush_tlb_range(vma, start, end);
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}
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}
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void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
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{
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struct mm_struct *mm = vma->vm_mm;
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if(mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
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local_flush_cache_page(vma, page);
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}
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}
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void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
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{
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struct mm_struct *mm = vma->vm_mm;
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if(mm->context != NO_CONTEXT) {
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
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local_flush_tlb_page(vma, page);
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}
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}
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void smp_reschedule_irq(void)
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{
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set_need_resched();
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}
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void smp_flush_page_to_ram(unsigned long page)
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{
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/* Current theory is that those who call this are the one's
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* who have just dirtied their cache with the pages contents
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* in kernel space, therefore we only run this on local cpu.
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*
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* XXX This experiment failed, research further... -DaveM
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*/
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#if 1
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xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
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#endif
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local_flush_page_to_ram(page);
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}
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void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
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{
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cpumask_t cpu_mask = mm->cpu_vm_mask;
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cpu_clear(smp_processor_id(), cpu_mask);
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if (!cpus_empty(cpu_mask))
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xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
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local_flush_sig_insns(mm, insn_addr);
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}
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extern unsigned int lvl14_resolution;
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/* /proc/profile writes can call this, don't __init it please. */
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static DEFINE_SPINLOCK(prof_setup_lock);
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int setup_profiling_timer(unsigned int multiplier)
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{
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int i;
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unsigned long flags;
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/* Prevent level14 ticker IRQ flooding. */
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if((!multiplier) || (lvl14_resolution / multiplier) < 500)
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return -EINVAL;
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spin_lock_irqsave(&prof_setup_lock, flags);
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for_each_possible_cpu(i) {
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load_profile_irq(i, lvl14_resolution / multiplier);
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prof_multiplier(i) = multiplier;
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}
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spin_unlock_irqrestore(&prof_setup_lock, flags);
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return 0;
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}
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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extern void __init smp4m_boot_cpus(void);
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extern void __init smp4d_boot_cpus(void);
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int i, cpuid, extra;
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printk("Entering SMP Mode...\n");
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extra = 0;
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for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
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if (cpuid >= NR_CPUS)
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extra++;
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}
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/* i = number of cpus */
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if (extra && max_cpus > i - extra)
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printk("Warning: NR_CPUS is too low to start all cpus\n");
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smp_store_cpu_info(boot_cpu_id);
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switch(sparc_cpu_model) {
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case sun4:
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printk("SUN4\n");
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BUG();
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break;
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case sun4c:
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printk("SUN4C\n");
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BUG();
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break;
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case sun4m:
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smp4m_boot_cpus();
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break;
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case sun4d:
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smp4d_boot_cpus();
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break;
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case sun4e:
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printk("SUN4E\n");
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BUG();
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break;
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case sun4u:
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printk("SUN4U\n");
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BUG();
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break;
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default:
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printk("UNKNOWN!\n");
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BUG();
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break;
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};
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}
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/* Set this up early so that things like the scheduler can init
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* properly. We use the same cpu mask for both the present and
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* possible cpu map.
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*/
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void __init smp_setup_cpu_possible_map(void)
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{
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int instance, mid;
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instance = 0;
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while (!cpu_find_by_instance(instance, NULL, &mid)) {
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if (mid < NR_CPUS) {
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cpu_set(mid, phys_cpu_present_map);
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cpu_set(mid, cpu_present_map);
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}
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instance++;
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}
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}
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void __init smp_prepare_boot_cpu(void)
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{
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int cpuid = hard_smp_processor_id();
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if (cpuid >= NR_CPUS) {
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prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
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prom_halt();
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}
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if (cpuid != 0)
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printk("boot cpu id != 0, this could work but is untested\n");
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current_thread_info()->cpu = cpuid;
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cpu_set(cpuid, cpu_online_map);
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cpu_set(cpuid, phys_cpu_present_map);
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}
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int __cpuinit __cpu_up(unsigned int cpu)
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{
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extern int __cpuinit smp4m_boot_one_cpu(int);
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extern int __cpuinit smp4d_boot_one_cpu(int);
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int ret=0;
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switch(sparc_cpu_model) {
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case sun4:
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printk("SUN4\n");
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BUG();
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break;
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case sun4c:
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printk("SUN4C\n");
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BUG();
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break;
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case sun4m:
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ret = smp4m_boot_one_cpu(cpu);
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break;
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case sun4d:
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ret = smp4d_boot_one_cpu(cpu);
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break;
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case sun4e:
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printk("SUN4E\n");
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BUG();
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break;
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case sun4u:
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printk("SUN4U\n");
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BUG();
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break;
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default:
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printk("UNKNOWN!\n");
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BUG();
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break;
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};
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if (!ret) {
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cpu_set(cpu, smp_commenced_mask);
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while (!cpu_online(cpu))
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mb();
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}
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return ret;
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}
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void smp_bogo(struct seq_file *m)
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{
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int i;
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for_each_online_cpu(i) {
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seq_printf(m,
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"Cpu%dBogo\t: %lu.%02lu\n",
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i,
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cpu_data(i).udelay_val/(500000/HZ),
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(cpu_data(i).udelay_val/(5000/HZ))%100);
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}
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}
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void smp_info(struct seq_file *m)
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{
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int i;
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seq_printf(m, "State:\n");
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for_each_online_cpu(i)
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seq_printf(m, "CPU%d\t\t: online\n", i);
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}
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