Viewing file:  smp.c (7.32 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* 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)
*/
#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 <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/hardirq.h>
#include <asm/softirq.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
#define IRQ_RESCHEDULE 13
#define IRQ_STOP_CPU 14
#define IRQ_CROSS_CALL 15
volatile int smp_processors_ready = 0;
unsigned long cpu_present_map = 0;
int smp_num_cpus = 1;
int smp_threads_ready=0;
unsigned char mid_xlate[NR_CPUS] = { 0, 0, 0, 0, };
volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
#ifdef NOTUSED
volatile unsigned long smp_spinning[NR_CPUS] = { 0, };
#endif
unsigned long smp_proc_in_lock[NR_CPUS] = { 0, };
struct cpuinfo_sparc cpu_data[NR_CPUS];
unsigned long cpu_offset[NR_CPUS];
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];
cycles_t cacheflush_time = 0; /* XXX */
/* 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...
*/
/* Kernel spinlock */
spinlock_t kernel_flag __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED;
/* Used to make bitops atomic */
unsigned char bitops_spinlock = 0;
volatile unsigned long ipi_count;
volatile int smp_process_available=0;
volatile int smp_commenced = 0;
/* Not supported on Sparc yet. */
void __init smp_setup(char *str, int *ints)
{
}
/*
* The bootstrap kernel entry code has set these up. Save them for
* a given CPU
*/
void __init smp_store_cpu_info(int id)
{
cpu_data[id].udelay_val = loops_per_jiffy; /* this is it on sparc. */
}
void __init smp_commence(void)
{
/*
* Lets the callin's below out of their loop.
*/
local_flush_cache_all();
local_flush_tlb_all();
smp_commenced = 1;
local_flush_cache_all();
local_flush_tlb_all();
}
/* Only broken Intel needs this, thus it should not even be referenced
* globally...
*/
void __init initialize_secondary(void)
{
}
extern int cpu_idle(void);
/* Activate a secondary processor. */
int start_secondary(void *unused)
{
prom_printf("Start secondary called. Should not happen\n");
return cpu_idle();
}
void cpu_panic(void)
{
printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
panic("SMP bolixed\n");
}
/*
* Cycle through the processors asking the PROM to start each one.
*/
extern struct prom_cpuinfo linux_cpus[NR_CPUS];
struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
void __init smp_boot_cpus(void)
{
extern void smp4m_boot_cpus(void);
extern void smp4d_boot_cpus(void);
if (sparc_cpu_model == sun4m)
smp4m_boot_cpus();
else
smp4d_boot_cpus();
}
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) {
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
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) {
if(mm->cpu_vm_mask != (1 << smp_processor_id())) {
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 = (1 << smp_processor_id());
}
local_flush_tlb_mm(mm);
}
}
void smp_flush_cache_range(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
if(mm->context != NO_CONTEXT) {
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) mm, start, end);
local_flush_cache_range(mm, start, end);
}
}
void smp_flush_tlb_range(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
if(mm->context != NO_CONTEXT) {
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) mm, start, end);
local_flush_tlb_range(mm, 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) {
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
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) {
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
local_flush_tlb_page(vma, page);
}
}
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)
{
if(mm->cpu_vm_mask != (1 << smp_processor_id()))
xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
local_flush_sig_insns(mm, insn_addr);
}
/* Reschedule call back. */
void smp_reschedule_irq(void)
{
current->need_resched = 1;
}
/* Stopping processors. */
void smp_stop_cpu_irq(void)
{
__sti();
while(1)
barrier();
}
unsigned int prof_multiplier[NR_CPUS];
unsigned int prof_counter[NR_CPUS];
extern unsigned int lvl14_resolution;
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;
save_and_cli(flags);
for(i = 0; i < NR_CPUS; i++) {
if(cpu_present_map & (1 << i)) {
load_profile_irq(mid_xlate[i], lvl14_resolution / multiplier);
prof_multiplier[i] = multiplier;
}
}
restore_flags(flags);
return 0;
}
void smp_bogo_info(struct seq_file *m)
{
int i;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_present_map & (1 << 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;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_present_map & (1 << i))
seq_printf(m, "CPU%d\t\t: online\n", i);
}
}
|