arch/sparc/kernel/sun4m_smp.c - maze/linux - Git at Google

 /*
  *  sun4m SMP support.
  *
  * 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/cacheflush.h>
 #include <asm/switch_to.h>
 #include <asm/tlbflush.h>

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

 #define IRQ_IPI_SINGLE		12
 #define IRQ_IPI_MASK		13
 #define IRQ_IPI_RESCHED		14
 #define IRQ_CROSS_CALL		15

 static inline unsigned long
 swap_ulong(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 smp4m_ipi_init(void);
 static void smp_setup_percpu_timer(void);

 void __cpuinit smp4m_callin(void)
 {
 	int cpuid = hard_smp_processor_id();

 	local_flush_cache_all();
 	local_flush_tlb_all();

 	notify_cpu_starting(cpuid);

 	/* Get our local ticker going. */
 	smp_setup_percpu_timer();

 	calibrate_delay();
 	smp_store_cpu_info(cpuid);

 	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.
 	 */
 	/* Allow master to continue. */
 	swap_ulong(&cpu_callin_map[cpuid], 1);

 	/* XXX: What's up with all the flushes? */
 	local_flush_cache_all();
 	local_flush_tlb_all();

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

 	/* Attach to the address space of init_task. */
 	atomic_inc(&init_mm.mm_count);
 	current->active_mm = &init_mm;

 	while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
 		mb();

 	local_irq_enable();

 	set_cpu_online(cpuid, true);
 }

 /*
  *	Cycle through the processors asking the PROM to start each one.
  */
 void __init smp4m_boot_cpus(void)
 {
 	smp4m_ipi_init();
 	smp_setup_percpu_timer();
 	local_flush_cache_all();
 }

 int __cpuinit smp4m_boot_one_cpu(int i)
 {
 	unsigned long *entry = &sun4m_cpu_startup;
 	struct task_struct *p;
 	int timeout;
 	int cpu_node;

 	cpu_find_by_mid(i, &cpu_node);

 	/* Cook up an idler for this guy. */
 	p = fork_idle(i);
 	current_set[i] = task_thread_info(p);
 	/* See trampoline.S for details... */
 	entry += ((i - 1) * 3);

 	/*
 	 * 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);

 	/* 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 smp4m_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. */
 }


 /* Initialize IPIs on the SUN4M SMP machine */
 static void __init smp4m_ipi_init(void)
 {
 }

 static void smp4m_ipi_resched(int cpu)
 {
 	set_cpu_int(cpu, IRQ_IPI_RESCHED);
 }

 static void smp4m_ipi_single(int cpu)
 {
 	set_cpu_int(cpu, IRQ_IPI_SINGLE);
 }

 static void smp4m_ipi_mask_one(int cpu)
 {
 	set_cpu_int(cpu, IRQ_IPI_MASK);
 }

 static struct smp_funcall {
 	smpfunc_t func;
 	unsigned long arg1;
 	unsigned long arg2;
 	unsigned long arg3;
 	unsigned long arg4;
 	unsigned long arg5;
 	unsigned long processors_in[SUN4M_NCPUS];  /* Set when ipi entered. */
 	unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
 } ccall_info;

 static DEFINE_SPINLOCK(cross_call_lock);

 /* Cross calls must be serialized, at least currently. */
 static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 			     unsigned long arg2, unsigned long arg3,
 			     unsigned long arg4)
 {
 		register int ncpus = SUN4M_NCPUS;
 		unsigned long flags;

 		spin_lock_irqsave(&cross_call_lock, flags);

 		/* Init function glue. */
 		ccall_info.func = func;
 		ccall_info.arg1 = arg1;
 		ccall_info.arg2 = arg2;
 		ccall_info.arg3 = arg3;
 		ccall_info.arg4 = arg4;
 		ccall_info.arg5 = 0;

 		/* Init receive/complete mapping, plus fire the IPI's off. */
 		{
 			register int i;

 			cpumask_clear_cpu(smp_processor_id(), &mask);
 			cpumask_and(&mask, cpu_online_mask, &mask);
 			for (i = 0; i < ncpus; i++) {
 				if (cpumask_test_cpu(i, &mask)) {
 					ccall_info.processors_in[i] = 0;
 					ccall_info.processors_out[i] = 0;
 					set_cpu_int(i, IRQ_CROSS_CALL);
 				} else {
 					ccall_info.processors_in[i] = 1;
 					ccall_info.processors_out[i] = 1;
 				}
 			}
 		}

 		{
 			register int i;

 			i = 0;
 			do {
 				if (!cpumask_test_cpu(i, &mask))
 					continue;
 				while (!ccall_info.processors_in[i])
 					barrier();
 			} while (++i < ncpus);

 			i = 0;
 			do {
 				if (!cpumask_test_cpu(i, &mask))
 					continue;
 				while (!ccall_info.processors_out[i])
 					barrier();
 			} while (++i < ncpus);
 		}
 		spin_unlock_irqrestore(&cross_call_lock, flags);
 }

 /* Running cross calls. */
 void smp4m_cross_call_irq(void)
 {
 	int i = smp_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 smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
 	int cpu = smp_processor_id();

 	old_regs = set_irq_regs(regs);

 	sun4m_clear_profile_irq(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 = smp_processor_id();

 	prof_counter(cpu) = prof_multiplier(cpu) = 1;
 	load_profile_irq(cpu, lvl14_resolution);

 	if (cpu == boot_cpu_id)
 		sun4m_unmask_profile_irq();
 }

 static void __init smp4m_blackbox_id(unsigned *addr)
 {
 	int rd = *addr & 0x3e000000;
 	int rs1 = rd >> 11;

 	addr[0] = 0x81580000 | rd;		/* rd %tbr, reg */
 	addr[1] = 0x8130200c | rd | rs1;	/* srl reg, 0xc, reg */
 	addr[2] = 0x80082003 | rd | rs1;	/* and reg, 3, reg */
 }

 static void __init smp4m_blackbox_current(unsigned *addr)
 {
 	int rd = *addr & 0x3e000000;
 	int rs1 = rd >> 11;

 	addr[0] = 0x81580000 | rd;		/* rd %tbr, reg */
 	addr[2] = 0x8130200a | rd | rs1;	/* srl reg, 0xa, reg */
 	addr[4] = 0x8008200c | rd | rs1;	/* and reg, 0xc, reg */
 }

 void __init sun4m_init_smp(void)
 {
 	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
 	BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 	BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(smp_ipi_resched, smp4m_ipi_resched, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(smp_ipi_single, smp4m_ipi_single, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(smp_ipi_mask_one, smp4m_ipi_mask_one, BTFIXUPCALL_NORM);
 }
	/*
	* sun4m SMP support.
	*
	* 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/cacheflush.h>
	#include <asm/switch_to.h>
	#include <asm/tlbflush.h>

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

	#define IRQ_IPI_SINGLE 12
	#define IRQ_IPI_MASK 13
	#define IRQ_IPI_RESCHED 14
	#define IRQ_CROSS_CALL 15

	static inline unsigned long
	swap_ulong(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 smp4m_ipi_init(void);
	static void smp_setup_percpu_timer(void);

	void __cpuinit smp4m_callin(void)
	{
	int cpuid = hard_smp_processor_id();

	local_flush_cache_all();
	local_flush_tlb_all();

	notify_cpu_starting(cpuid);

	/* Get our local ticker going. */
	smp_setup_percpu_timer();

	calibrate_delay();
	smp_store_cpu_info(cpuid);

	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.
	*/
	/* Allow master to continue. */
	swap_ulong(&cpu_callin_map[cpuid], 1);

	/* XXX: What's up with all the flushes? */
	local_flush_cache_all();
	local_flush_tlb_all();

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

	/* Attach to the address space of init_task. */
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;

	while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
	mb();

	local_irq_enable();

	set_cpu_online(cpuid, true);
	}

	/*
	* Cycle through the processors asking the PROM to start each one.
	*/
	void __init smp4m_boot_cpus(void)
	{
	smp4m_ipi_init();
	smp_setup_percpu_timer();
	local_flush_cache_all();
	}

	int __cpuinit smp4m_boot_one_cpu(int i)
	{
	unsigned long *entry = &sun4m_cpu_startup;
	struct task_struct *p;
	int timeout;
	int cpu_node;

	cpu_find_by_mid(i, &cpu_node);

	/* Cook up an idler for this guy. */
	p = fork_idle(i);
	current_set[i] = task_thread_info(p);
	/* See trampoline.S for details... */
	entry += ((i - 1) * 3);

	/*
	* 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);

	/* 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 smp4m_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. */
	}


	/* Initialize IPIs on the SUN4M SMP machine */
	static void __init smp4m_ipi_init(void)
	{
	}

	static void smp4m_ipi_resched(int cpu)
	{
	set_cpu_int(cpu, IRQ_IPI_RESCHED);
	}

	static void smp4m_ipi_single(int cpu)
	{
	set_cpu_int(cpu, IRQ_IPI_SINGLE);
	}

	static void smp4m_ipi_mask_one(int cpu)
	{
	set_cpu_int(cpu, IRQ_IPI_MASK);
	}

	static struct smp_funcall {
	smpfunc_t func;
	unsigned long arg1;
	unsigned long arg2;
	unsigned long arg3;
	unsigned long arg4;
	unsigned long arg5;
	unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */
	unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
	} ccall_info;

	static DEFINE_SPINLOCK(cross_call_lock);

	/* Cross calls must be serialized, at least currently. */
	static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	unsigned long arg2, unsigned long arg3,
	unsigned long arg4)
	{
	register int ncpus = SUN4M_NCPUS;
	unsigned long flags;

	spin_lock_irqsave(&cross_call_lock, flags);

	/* Init function glue. */
	ccall_info.func = func;
	ccall_info.arg1 = arg1;
	ccall_info.arg2 = arg2;
	ccall_info.arg3 = arg3;
	ccall_info.arg4 = arg4;
	ccall_info.arg5 = 0;

	/* Init receive/complete mapping, plus fire the IPI's off. */
	{
	register int i;

	cpumask_clear_cpu(smp_processor_id(), &mask);
	cpumask_and(&mask, cpu_online_mask, &mask);
	for (i = 0; i < ncpus; i++) {
	if (cpumask_test_cpu(i, &mask)) {
	ccall_info.processors_in[i] = 0;
	ccall_info.processors_out[i] = 0;
	set_cpu_int(i, IRQ_CROSS_CALL);
	} else {
	ccall_info.processors_in[i] = 1;
	ccall_info.processors_out[i] = 1;
	}
	}
	}

	{
	register int i;

	i = 0;
	do {
	if (!cpumask_test_cpu(i, &mask))
	continue;
	while (!ccall_info.processors_in[i])
	barrier();
	} while (++i < ncpus);

	i = 0;
	do {
	if (!cpumask_test_cpu(i, &mask))
	continue;
	while (!ccall_info.processors_out[i])
	barrier();
	} while (++i < ncpus);
	}
	spin_unlock_irqrestore(&cross_call_lock, flags);
	}

	/* Running cross calls. */
	void smp4m_cross_call_irq(void)
	{
	int i = smp_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 smp4m_percpu_timer_interrupt(struct pt_regs *regs)
	{
	struct pt_regs *old_regs;
	int cpu = smp_processor_id();

	old_regs = set_irq_regs(regs);

	sun4m_clear_profile_irq(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 = smp_processor_id();

	prof_counter(cpu) = prof_multiplier(cpu) = 1;
	load_profile_irq(cpu, lvl14_resolution);

	if (cpu == boot_cpu_id)
	sun4m_unmask_profile_irq();
	}

	static void __init smp4m_blackbox_id(unsigned *addr)
	{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	addr[0] = 0x81580000 \| rd; /* rd %tbr, reg */
	addr[1] = 0x8130200c \| rd \| rs1; /* srl reg, 0xc, reg */
	addr[2] = 0x80082003 \| rd \| rs1; /* and reg, 3, reg */
	}

	static void __init smp4m_blackbox_current(unsigned *addr)
	{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	addr[0] = 0x81580000 \| rd; /* rd %tbr, reg */
	addr[2] = 0x8130200a \| rd \| rs1; /* srl reg, 0xa, reg */
	addr[4] = 0x8008200c \| rd \| rs1; /* and reg, 0xc, reg */
	}

	void __init sun4m_init_smp(void)
	{
	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
	BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
	BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_resched, smp4m_ipi_resched, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_single, smp4m_ipi_single, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_mask_one, smp4m_ipi_mask_one, BTFIXUPCALL_NORM);
	}