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/* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
*
* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*
* Based on sun4m's smp.c, which is:
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#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 <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>
#include <asm/sbus.h>
#include <asm/sbi.h>
#define __KERNEL_SYSCALLS__
#include <linux/unistd.h>
#define IRQ_CROSS_CALL 15
extern ctxd_t *srmmu_ctx_table_phys;
extern int linux_num_cpus;
extern void calibrate_delay(void);
extern struct task_struct *current_set[NR_CPUS];
extern volatile int smp_processors_ready;
extern unsigned long cpu_present_map;
extern int smp_num_cpus;
static int smp_highest_cpu = 0;
extern int smp_threads_ready;
extern unsigned char mid_xlate[NR_CPUS];
extern volatile unsigned long cpu_callin_map[NR_CPUS];
extern unsigned long smp_proc_in_lock[NR_CPUS];
extern struct cpuinfo_sparc cpu_data[NR_CPUS];
extern unsigned long cpu_offset[NR_CPUS];
extern unsigned char boot_cpu_id;
extern int smp_activated;
extern volatile int __cpu_number_map[NR_CPUS];
extern volatile int __cpu_logical_map[NR_CPUS];
extern volatile unsigned long ipi_count;
extern volatile int smp_process_available;
extern volatile int smp_commenced;
extern int __smp4d_processor_id(void);
extern unsigned long totalram_pages;
/* #define SMP_DEBUG */
#ifdef SMP_DEBUG
#define SMP_PRINTK(x) printk x
#else
#define SMP_PRINTK(x)
#endif
static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
{
__asm__ __volatile__("swap [%1], %0\n\t" :
"=&r" (val), "=&r" (ptr) :
"0" (val), "1" (ptr));
return val;
}
static void smp_setup_percpu_timer(void);
extern void cpu_probe(void);
extern void sun4d_distribute_irqs(void);
void __init smp4d_callin(void)
{
int cpuid = hard_smp4d_processor_id();
extern spinlock_t sun4d_imsk_lock;
unsigned long flags;
/* Show we are alive */
cpu_leds[cpuid] = 0x6;
show_leds(cpuid);
/* Enable level15 interrupt, disable level14 interrupt for now */
cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
local_flush_cache_all();
local_flush_tlb_all();
/*
* Unblock the master CPU _only_ when the scheduler state
* of all secondary CPUs will be up-to-date, so after
* the SMP initialization the master will be just allowed
* to call the scheduler code.
*/
init_idle();
/* Get our local ticker going. */
smp_setup_percpu_timer();
calibrate_delay();
smp_store_cpu_info(cpuid);
local_flush_cache_all();
local_flush_tlb_all();
/* Allow master to continue. */
swap((unsigned long *)&cpu_callin_map[cpuid], 1);
local_flush_cache_all();
local_flush_tlb_all();
cpu_probe();
while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
barrier();
while(current_set[cpuid]->processor != cpuid)
barrier();
/* Fix idle thread fields. */
__asm__ __volatile__("ld [%0], %%g6\n\t"
"sta %%g6, [%%g0] %1\n\t"
: : "r" (¤t_set[cpuid]), "i" (ASI_M_VIKING_TMP2)
: "memory" /* paranoid */);
cpu_leds[cpuid] = 0x9;
show_leds(cpuid);
/* Attach to the address space of init_task. */
atomic_inc(&init_mm.mm_count);
current->active_mm = &init_mm;
local_flush_cache_all();
local_flush_tlb_all();
__sti(); /* We don't allow PIL 14 yet */
while(!smp_commenced)
barrier();
spin_lock_irqsave(&sun4d_imsk_lock, flags);
cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
}
extern int cpu_idle(void *unused);
extern void init_IRQ(void);
extern void cpu_panic(void);
extern int start_secondary(void *unused);
/*
* Cycle through the processors asking the PROM to start each one.
*/
extern struct prom_cpuinfo linux_cpus[NR_CPUS];
extern struct linux_prom_registers smp_penguin_ctable;
extern unsigned long trapbase_cpu1[];
extern unsigned long trapbase_cpu2[];
extern unsigned long trapbase_cpu3[];
void __init smp4d_boot_cpus(void)
{
int cpucount = 0;
int i = 0;
printk("Entering SMP Mode...\n");
for (i = 0; i < NR_CPUS; i++)
cpu_offset[i] = (char *)&cpu_data[i] - (char *)&cpu_data;
if (boot_cpu_id)
current_set[0] = NULL;
__sti();
cpu_present_map = 0;
for(i=0; i < linux_num_cpus; i++)
cpu_present_map |= (1<<linux_cpus[i].mid);
SMP_PRINTK(("cpu_present_map %08lx\n", cpu_present_map));
for(i=0; i < NR_CPUS; i++)
__cpu_number_map[i] = -1;
for(i=0; i < NR_CPUS; i++)
__cpu_logical_map[i] = -1;
for(i=0; i < NR_CPUS; i++)
mid_xlate[i] = i;
__cpu_number_map[boot_cpu_id] = 0;
__cpu_logical_map[0] = boot_cpu_id;
current->processor = boot_cpu_id;
smp_store_cpu_info(boot_cpu_id);
smp_setup_percpu_timer();
init_idle();
local_flush_cache_all();
if(linux_num_cpus == 1)
return; /* Not an MP box. */
SMP_PRINTK(("Iterating over CPUs\n"));
for(i = 0; i < NR_CPUS; i++) {
if(i == boot_cpu_id)
continue;
if(cpu_present_map & (1 << i)) {
extern unsigned long sun4d_cpu_startup;
unsigned long *entry = &sun4d_cpu_startup;
struct task_struct *p;
int timeout;
int no;
/* Cook up an idler for this guy. */
kernel_thread(start_secondary, NULL, CLONE_PID);
cpucount++;
p = init_task.prev_task;
init_tasks[i] = p;
p->processor = i;
p->cpus_runnable = 1 << i; /* we schedule the first task manually */
current_set[i] = p;
del_from_runqueue(p);
unhash_process(p);
for (no = 0; no < linux_num_cpus; no++)
if (linux_cpus[no].mid == i)
break;
/*
* Initialize the contexts table
* Since the call to prom_startcpu() trashes the structure,
* we need to re-initialize it for each cpu
*/
smp_penguin_ctable.which_io = 0;
smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
smp_penguin_ctable.reg_size = 0;
/* whirrr, whirrr, whirrrrrrrrr... */
SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", i, entry, cpucount, linux_cpus[no].prom_node));
local_flush_cache_all();
prom_startcpu(linux_cpus[no].prom_node,
&smp_penguin_ctable, 0, (char *)entry);
SMP_PRINTK(("prom_startcpu returned :)\n"));
/* wheee... it's going... */
for(timeout = 0; timeout < 10000; timeout++) {
if(cpu_callin_map[i])
break;
udelay(200);
}
if(cpu_callin_map[i]) {
/* Another "Red Snapper". */
__cpu_number_map[i] = cpucount;
__cpu_logical_map[cpucount] = i;
} else {
cpucount--;
printk("Processor %d is stuck.\n", i);
}
}
if(!(cpu_callin_map[i])) {
cpu_present_map &= ~(1 << i);
__cpu_number_map[i] = -1;
}
}
local_flush_cache_all();
if(cpucount == 0) {
printk("Error: only one Processor found.\n");
cpu_present_map = (1 << hard_smp4d_processor_id());
} else {
unsigned long bogosum = 0;
for(i = 0; i < NR_CPUS; i++) {
if(cpu_present_map & (1 << i)) {
bogosum += cpu_data[i].udelay_val;
smp_highest_cpu = i;
}
}
SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
cpucount + 1,
bogosum/(500000/HZ),
(bogosum/(5000/HZ))%100);
smp_activated = 1;
smp_num_cpus = cpucount + 1;
}
/* Free unneeded trap tables */
ClearPageReserved(virt_to_page(trapbase_cpu1));
set_page_count(virt_to_page(trapbase_cpu1), 1);
free_page((unsigned long)trapbase_cpu1);
totalram_pages++;
num_physpages++;
ClearPageReserved(virt_to_page(trapbase_cpu2));
set_page_count(virt_to_page(trapbase_cpu2), 1);
free_page((unsigned long)trapbase_cpu2);
totalram_pages++;
num_physpages++;
ClearPageReserved(virt_to_page(trapbase_cpu3));
set_page_count(virt_to_page(trapbase_cpu3), 1);
free_page((unsigned long)trapbase_cpu3);
totalram_pages++;
num_physpages++;
/* Ok, they are spinning and ready to go. */
smp_processors_ready = 1;
sun4d_distribute_irqs();
}
static struct smp_funcall {
smpfunc_t func;
unsigned long arg1;
unsigned long arg2;
unsigned long arg3;
unsigned long arg4;
unsigned long arg5;
unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */
unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
} ccall_info __attribute__((aligned(8)));
static spinlock_t cross_call_lock = SPIN_LOCK_UNLOCKED;
/* Cross calls must be serialized, at least currently. */
void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
unsigned long arg3, unsigned long arg4, unsigned long arg5)
{
if(smp_processors_ready) {
register int high = smp_highest_cpu;
unsigned long flags;
spin_lock_irqsave(&cross_call_lock, flags);
{
/* If you make changes here, make sure gcc generates proper code... */
smpfunc_t f asm("i0") = func;
unsigned long a1 asm("i1") = arg1;
unsigned long a2 asm("i2") = arg2;
unsigned long a3 asm("i3") = arg3;
unsigned long a4 asm("i4") = arg4;
unsigned long a5 asm("i5") = arg5;
__asm__ __volatile__("
std %0, [%6]
std %2, [%6 + 8]
std %4, [%6 + 16]" : :
"r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
"r" (&ccall_info.func));
}
/* Init receive/complete mapping, plus fire the IPI's off. */
{
register unsigned long mask;
register int i;
mask = (cpu_present_map & ~(1 << hard_smp4d_processor_id()));
for(i = 0; i <= high; i++) {
if(mask & (1 << i)) {
ccall_info.processors_in[i] = 0;
ccall_info.processors_out[i] = 0;
sun4d_send_ipi(i, IRQ_CROSS_CALL);
}
}
}
{
register int i;
i = 0;
do {
while(!ccall_info.processors_in[i])
barrier();
} while(++i <= high);
i = 0;
do {
while(!ccall_info.processors_out[i])
barrier();
} while(++i <= high);
}
spin_unlock_irqrestore(&cross_call_lock, flags);
}
}
/* Running cross calls. */
void smp4d_cross_call_irq(void)
{
int i = hard_smp4d_processor_id();
ccall_info.processors_in[i] = 1;
ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
ccall_info.arg4, ccall_info.arg5);
ccall_info.processors_out[i] = 1;
}
static int smp4d_stop_cpu_sender;
static void smp4d_stop_cpu(void)
{
int me = hard_smp4d_processor_id();
if (me != smp4d_stop_cpu_sender)
while(1) barrier();
}
/* Cross calls, in order to work efficiently and atomically do all
* the message passing work themselves, only stopcpu and reschedule
* messages come through here.
*/
void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
{
int me = hard_smp4d_processor_id();
SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
unsigned long flags;
static spinlock_t stop_cpu_lock = SPIN_LOCK_UNLOCKED;
spin_lock_irqsave(&stop_cpu_lock, flags);
smp4d_stop_cpu_sender = me;
smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
spin_unlock_irqrestore(&stop_cpu_lock, flags);
}
printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
panic("Bogon SMP message pass.");
}
extern unsigned int prof_multiplier[NR_CPUS];
extern unsigned int prof_counter[NR_CPUS];
extern void sparc_do_profile(unsigned long pc, unsigned long o7);
void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
{
int cpu = hard_smp4d_processor_id();
static int cpu_tick[NR_CPUS];
static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
bw_get_prof_limit(cpu);
bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
cpu_tick[cpu]++;
if (!(cpu_tick[cpu] & 15)) {
if (cpu_tick[cpu] == 0x60)
cpu_tick[cpu] = 0;
cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
show_leds(cpu);
}
if(!user_mode(regs))
sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
if(!--prof_counter[cpu]) {
int user = user_mode(regs);
irq_enter(cpu, 0);
update_process_times(user);
irq_exit(cpu, 0);
prof_counter[cpu] = prof_multiplier[cpu];
}
}
extern unsigned int lvl14_resolution;
static void __init smp_setup_percpu_timer(void)
{
int cpu = hard_smp4d_processor_id();
prof_counter[cpu] = prof_multiplier[cpu] = 1;
load_profile_irq(cpu, lvl14_resolution);
}
void __init smp4d_blackbox_id(unsigned *addr)
{
int rd = *addr & 0x3e000000;
addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
addr[1] = 0x01000000; /* nop */
addr[2] = 0x01000000; /* nop */
}
void __init smp4d_blackbox_current(unsigned *addr)
{
/* We have a nice Linux current register :) */
int rd = addr[1] & 0x3e000000;
addr[0] = 0x10800006; /* b .+24 */
addr[1] = 0xc0800820 | rd; /* lda [%g0] ASI_M_VIKING_TMP2, reg */
}
void __init sun4d_init_smp(void)
{
int i;
extern unsigned int patchme_store_new_current[];
extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
/* Store current into Linux current register :) */
__asm__ __volatile__("sta %%g6, [%%g0] %0" : : "i"(ASI_M_VIKING_TMP2));
/* Patch switch_to */
patchme_store_new_current[0] = (patchme_store_new_current[0] & 0x3e000000) | 0xc0a00820;
/* Patch ipi15 trap table */
t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
/* And set btfixup... */
BTFIXUPSET_BLACKBOX(smp_processor_id, smp4d_blackbox_id);
BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(__smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
for (i = 0; i < NR_CPUS; i++) {
ccall_info.processors_in[i] = 1;
ccall_info.processors_out[i] = 1;
}
}
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