arch/sparc/kernel/sun4d_smp.c - linux - Git at Google

 /* 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 <linux/interrupt.h>
 #include <linux/profile.h>
 #include <linux/delay.h>
 #include <linux/cpu.h>

 #include <asm/sbi.h>
 #include <asm/mmu.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>

 #include "kernel.h"
 #include "irq.h"

 #define IRQ_CROSS_CALL		15

 static volatile int smp_processors_ready;
 static int smp_highest_cpu;

 static inline unsigned long sun4d_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);

 static unsigned char cpu_leds[32];

 static inline void show_leds(int cpuid)
 {
 	cpuid &= 0x1e;
 	__asm__ __volatile__ ("stba %0, [%1] %2" : :
 			      "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]),
 			      "r" (ECSR_BASE(cpuid) | BB_LEDS),
 			      "i" (ASI_M_CTL));
 }

 void __cpuinit smp4d_callin(void)
 {
 	int cpuid = hard_smp4d_processor_id();
 	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();

 	notify_cpu_starting(cpuid);
 	/*
 	 * 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.
 	 */
 	/* 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. */
 	sun4d_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]->cpu != cpuid)
 		barrier();

 	/* Fix idle thread fields. */
 	__asm__ __volatile__("ld [%0], %%g6\n\t"
 			     : : "r" (&current_set[cpuid])
 			     : "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();

 	local_irq_enable();	/* We don't allow PIL 14 yet */

 	while (!cpu_isset(cpuid, smp_commenced_mask))
 		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);
 	set_cpu_online(cpuid, true);

 }

 /*
  *	Cycle through the processors asking the PROM to start each one.
  */
 void __init smp4d_boot_cpus(void)
 {
 	if (boot_cpu_id)
 		current_set[0] = NULL;
 	smp_setup_percpu_timer();
 	local_flush_cache_all();
 }

 int __cpuinit smp4d_boot_one_cpu(int i)
 {
 	unsigned long *entry = &sun4d_cpu_startup;
 	struct task_struct *p;
 	int timeout;
 	int cpu_node;

 	cpu_find_by_instance(i, &cpu_node, NULL);
 	/* Cook up an idler for this guy. */
 	p = fork_idle(i);
 	current_set[i] = task_thread_info(p);

 	/*
 	 * 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... */
 	printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
 	local_flush_cache_all();
 	prom_startcpu(cpu_node,
 		      &smp_penguin_ctable, 0, (char *)entry);

 	printk(KERN_INFO "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])) {
 		printk(KERN_ERR "Processor %d is stuck.\n", i);
 		return -ENODEV;

 	}
 	local_flush_cache_all();
 	return 0;
 }

 void __init smp4d_smp_done(void)
 {
 	int i, first;
 	int *prev;

 	/* setup cpu list for irq rotation */
 	first = 0;
 	prev = &first;
 	for_each_online_cpu(i) {
 		*prev = i;
 		prev = &cpu_data(i).next;
 	}
 	*prev = first;
 	local_flush_cache_all();

 	/* 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 DEFINE_SPINLOCK(cross_call_lock);

 /* Cross calls must be serialized, at least currently. */
 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 			     unsigned long arg2, unsigned long arg3,
 			     unsigned long arg4)
 {
 	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...
 			 */
 			register smpfunc_t f asm("i0") = func;
 			register unsigned long a1 asm("i1") = arg1;
 			register unsigned long a2 asm("i2") = arg2;
 			register unsigned long a3 asm("i3") = arg3;
 			register unsigned long a4 asm("i4") = arg4;
 			register unsigned long a5 asm("i5") = 0;

 			__asm__ __volatile__(
 				"std %0, [%6]\n\t"
 				"std %2, [%6 + 8]\n\t"
 				"std %4, [%6 + 16]\n\t" : :
 				"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 int i;

 			cpu_clear(smp_processor_id(), mask);
 			cpus_and(mask, cpu_online_map, mask);
 			for (i = 0; i <= high; i++) {
 				if (cpu_isset(i, mask)) {
 					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 {
 				if (!cpu_isset(i, mask))
 					continue;
 				while (!ccall_info.processors_in[i])
 					barrier();
 			} while (++i <= high);

 			i = 0;
 			do {
 				if (!cpu_isset(i, mask))
 					continue;
 				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;
 }

 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
 	int cpu = hard_smp4d_processor_id();
 	static int cpu_tick[NR_CPUS];
 	static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };

 	old_regs = set_irq_regs(regs);
 	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);
 	}

 	profile_tick(CPU_PROFILING);

 	if (!--prof_counter(cpu)) {
 		int user = user_mode(regs);

 		irq_enter();
 		update_process_times(user);
 		irq_exit();

 		prof_counter(cpu) = prof_multiplier(cpu);
 	}
 	set_irq_regs(old_regs);
 }

 static void __cpuinit 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)
 {
 	int rd = *addr & 0x3e000000;

 	addr[0] = 0xc0800800 | rd;		/* lda [%g0] ASI_M_VIKING_TMP1, reg */
 	addr[2] = 0x81282002 | rd | (rd >> 11);	/* sll reg, 2, reg */
 	addr[4] = 0x01000000;			/* nop */
 }

 void __init sun4d_init_smp(void)
 {
 	int i;

 	/* Patch ipi15 trap table */
 	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);

 	/* And set btfixup... */
 	BTFIXUPSET_BLACKBOX(hard_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(__hard_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;
 	}
 }
	/* 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 <linux/interrupt.h>
	#include <linux/profile.h>
	#include <linux/delay.h>
	#include <linux/cpu.h>

	#include <asm/sbi.h>
	#include <asm/mmu.h>
	#include <asm/tlbflush.h>
	#include <asm/cacheflush.h>

	#include "kernel.h"
	#include "irq.h"

	#define IRQ_CROSS_CALL 15

	static volatile int smp_processors_ready;
	static int smp_highest_cpu;

	static inline unsigned long sun4d_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);

	static unsigned char cpu_leds[32];

	static inline void show_leds(int cpuid)
	{
	cpuid &= 0x1e;
	__asm__ __volatile__ ("stba %0, [%1] %2" : :
	"r" ((cpu_leds[cpuid] << 4) \| cpu_leds[cpuid+1]),
	"r" (ECSR_BASE(cpuid) \| BB_LEDS),
	"i" (ASI_M_CTL));
	}

	void __cpuinit smp4d_callin(void)
	{
	int cpuid = hard_smp4d_processor_id();
	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();

	notify_cpu_starting(cpuid);
	/*
	* 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.
	*/
	/* 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. */
	sun4d_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]->cpu != cpuid)
	barrier();

	/* Fix idle thread fields. */
	__asm__ __volatile__("ld [%0], %%g6\n\t"
	: : "r" (&current_set[cpuid])
	: "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();

	local_irq_enable(); /* We don't allow PIL 14 yet */

	while (!cpu_isset(cpuid, smp_commenced_mask))
	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);
	set_cpu_online(cpuid, true);

	}

	/*
	* Cycle through the processors asking the PROM to start each one.
	*/
	void __init smp4d_boot_cpus(void)
	{
	if (boot_cpu_id)
	current_set[0] = NULL;
	smp_setup_percpu_timer();
	local_flush_cache_all();
	}

	int __cpuinit smp4d_boot_one_cpu(int i)
	{
	unsigned long *entry = &sun4d_cpu_startup;
	struct task_struct *p;
	int timeout;
	int cpu_node;

	cpu_find_by_instance(i, &cpu_node, NULL);
	/* Cook up an idler for this guy. */
	p = fork_idle(i);
	current_set[i] = task_thread_info(p);

	/*
	* 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... */
	printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
	local_flush_cache_all();
	prom_startcpu(cpu_node,
	&smp_penguin_ctable, 0, (char *)entry);

	printk(KERN_INFO "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])) {
	printk(KERN_ERR "Processor %d is stuck.\n", i);
	return -ENODEV;

	}
	local_flush_cache_all();
	return 0;
	}

	void __init smp4d_smp_done(void)
	{
	int i, first;
	int *prev;

	/* setup cpu list for irq rotation */
	first = 0;
	prev = &first;
	for_each_online_cpu(i) {
	*prev = i;
	prev = &cpu_data(i).next;
	}
	*prev = first;
	local_flush_cache_all();

	/* 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 DEFINE_SPINLOCK(cross_call_lock);

	/* Cross calls must be serialized, at least currently. */
	static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	unsigned long arg2, unsigned long arg3,
	unsigned long arg4)
	{
	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...
	*/
	register smpfunc_t f asm("i0") = func;
	register unsigned long a1 asm("i1") = arg1;
	register unsigned long a2 asm("i2") = arg2;
	register unsigned long a3 asm("i3") = arg3;
	register unsigned long a4 asm("i4") = arg4;
	register unsigned long a5 asm("i5") = 0;

	__asm__ __volatile__(
	"std %0, [%6]\n\t"
	"std %2, [%6 + 8]\n\t"
	"std %4, [%6 + 16]\n\t" : :
	"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 int i;

	cpu_clear(smp_processor_id(), mask);
	cpus_and(mask, cpu_online_map, mask);
	for (i = 0; i <= high; i++) {
	if (cpu_isset(i, mask)) {
	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 {
	if (!cpu_isset(i, mask))
	continue;
	while (!ccall_info.processors_in[i])
	barrier();
	} while (++i <= high);

	i = 0;
	do {
	if (!cpu_isset(i, mask))
	continue;
	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;
	}

	void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
	{
	struct pt_regs *old_regs;
	int cpu = hard_smp4d_processor_id();
	static int cpu_tick[NR_CPUS];
	static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };

	old_regs = set_irq_regs(regs);
	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);
	}

	profile_tick(CPU_PROFILING);

	if (!--prof_counter(cpu)) {
	int user = user_mode(regs);

	irq_enter();
	update_process_times(user);
	irq_exit();

	prof_counter(cpu) = prof_multiplier(cpu);
	}
	set_irq_regs(old_regs);
	}

	static void __cpuinit 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)
	{
	int rd = *addr & 0x3e000000;

	addr[0] = 0xc0800800 \| rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
	addr[2] = 0x81282002 \| rd \| (rd >> 11); /* sll reg, 2, reg */
	addr[4] = 0x01000000; /* nop */
	}

	void __init sun4d_init_smp(void)
	{
	int i;

	/* Patch ipi15 trap table */
	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);

	/* And set btfixup... */
	BTFIXUPSET_BLACKBOX(hard_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(__hard_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;
	}
	}