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