[net-next-2.6.git] / arch / parisc / kernel / smp.c

/*
** SMP Support
**
** Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org>
** 
** Lots of stuff stolen from arch/alpha/kernel/smp.c
** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^)
**
** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work.
** -grant (1/12/2001)
**
**	This program is free software; you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**      the Free Software Foundation; either version 2 of the License, or
**      (at your option) any later version.
*/
#undef ENTRY_SYS_CPUS	/* syscall support for iCOD-like functionality */

#include <linux/config.h>

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/kernel_stat.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/atomic.h>
#include <asm/current.h>
#include <asm/delay.h>
#include <asm/pgalloc.h>	/* for flush_tlb_all() proto/macro */

#include <asm/io.h>
#include <asm/irq.h>		/* for CPU_IRQ_REGION and friends */
#include <asm/mmu_context.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
#include <asm/cacheflush.h>

#define kDEBUG 0

DEFINE_SPINLOCK(smp_lock);

volatile struct task_struct *smp_init_current_idle_task;

static volatile int cpu_now_booting = 0;	/* track which CPU is booting */

static int parisc_max_cpus = 1;

/* online cpus are ones that we've managed to bring up completely
 * possible cpus are all valid cpu 
 * present cpus are all detected cpu
 *
 * On startup we bring up the "possible" cpus. Since we discover
 * CPUs later, we add them as hotplug, so the possible cpu mask is
 * empty in the beginning.
 */

cpumask_t cpu_online_map = CPU_MASK_NONE;	/* Bitmap of online CPUs */
cpumask_t cpu_possible_map = CPU_MASK_ALL;	/* Bitmap of Present CPUs */

EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_possible_map);


struct smp_call_struct {
	void (*func) (void *info);
	void *info;
	long wait;
	atomic_t unstarted_count;
	atomic_t unfinished_count;
};
static volatile struct smp_call_struct *smp_call_function_data;

enum ipi_message_type {
	IPI_NOP=0,
	IPI_RESCHEDULE=1,
	IPI_CALL_FUNC,
	IPI_CPU_START,
	IPI_CPU_STOP,
	IPI_CPU_TEST
};


/********** SMP inter processor interrupt and communication routines */

#undef PER_CPU_IRQ_REGION
#ifdef PER_CPU_IRQ_REGION
/* XXX REVISIT Ignore for now.
**    *May* need this "hook" to register IPI handler
**    once we have perCPU ExtIntr switch tables.
*/
static void
ipi_init(int cpuid)
{

	/* If CPU is present ... */
#ifdef ENTRY_SYS_CPUS
	/* *and* running (not stopped) ... */
#error iCOD support wants state checked here.
#endif

#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region

	if(cpu_online(cpuid) )
	{
		switch_to_idle_task(current);
	}

	return;
}
#endif


/*
** Yoink this CPU from the runnable list... 
**
*/
static void
halt_processor(void) 
{
#ifdef ENTRY_SYS_CPUS
#error halt_processor() needs rework
/*
** o migrate I/O interrupts off this CPU.
** o leave IPI enabled - __cli() will disable IPI.
** o leave CPU in online map - just change the state
*/
	cpu_data[this_cpu].state = STATE_STOPPED;
	mark_bh(IPI_BH);
#else
	/* REVISIT : redirect I/O Interrupts to another CPU? */
	/* REVISIT : does PM *know* this CPU isn't available? */
	cpu_clear(smp_processor_id(), cpu_online_map);
	local_irq_disable();
	for (;;)
		;
#endif
}


irqreturn_t
ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs) 
{
	int this_cpu = smp_processor_id();
	struct cpuinfo_parisc *p = &cpu_data[this_cpu];
	unsigned long ops;
	unsigned long flags;

	/* Count this now; we may make a call that never returns. */
	p->ipi_count++;

	mb();	/* Order interrupt and bit testing. */

	for (;;) {
		spin_lock_irqsave(&(p->lock),flags);
		ops = p->pending_ipi;
		p->pending_ipi = 0;
		spin_unlock_irqrestore(&(p->lock),flags);

		mb(); /* Order bit clearing and data access. */

		if (!ops)
		    break;

		while (ops) {
			unsigned long which = ffz(~ops);

			switch (which) {
			case IPI_RESCHEDULE:
#if (kDEBUG>=100)
				printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
#endif /* kDEBUG */
				ops &= ~(1 << IPI_RESCHEDULE);
				/*
				 * Reschedule callback.  Everything to be
				 * done is done by the interrupt return path.
				 */
				break;

			case IPI_CALL_FUNC:
#if (kDEBUG>=100)
				printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
#endif /* kDEBUG */
				ops &= ~(1 << IPI_CALL_FUNC);
				{
					volatile struct smp_call_struct *data;
					void (*func)(void *info);
					void *info;
					int wait;

					data = smp_call_function_data;
					func = data->func;
					info = data->info;
					wait = data->wait;

					mb();
					atomic_dec ((atomic_t *)&data->unstarted_count);

					/* At this point, *data can't
					 * be relied upon.
					 */

					(*func)(info);

					/* Notify the sending CPU that the
					 * task is done.
					 */
					mb();
					if (wait)
						atomic_dec ((atomic_t *)&data->unfinished_count);
				}
				break;

			case IPI_CPU_START:
#if (kDEBUG>=100)
				printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
#endif /* kDEBUG */
				ops &= ~(1 << IPI_CPU_START);
#ifdef ENTRY_SYS_CPUS
				p->state = STATE_RUNNING;
#endif
				break;

			case IPI_CPU_STOP:
#if (kDEBUG>=100)
				printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
#endif /* kDEBUG */
				ops &= ~(1 << IPI_CPU_STOP);
#ifdef ENTRY_SYS_CPUS
#else
				halt_processor();
#endif
				break;

			case IPI_CPU_TEST:
#if (kDEBUG>=100)
				printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
#endif /* kDEBUG */
				ops &= ~(1 << IPI_CPU_TEST);
				break;

			default:
				printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
					this_cpu, which);
				ops &= ~(1 << which);
				return IRQ_NONE;
			} /* Switch */
		} /* while (ops) */
	}
	return IRQ_HANDLED;
}


static inline void
ipi_send(int cpu, enum ipi_message_type op)
{
	struct cpuinfo_parisc *p = &cpu_data[cpu];
	unsigned long flags;

	spin_lock_irqsave(&(p->lock),flags);
	p->pending_ipi |= 1 << op;
	gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
	spin_unlock_irqrestore(&(p->lock),flags);
}


static inline void
send_IPI_single(int dest_cpu, enum ipi_message_type op)
{
	if (dest_cpu == NO_PROC_ID) {
		BUG();
		return;
	}

	ipi_send(dest_cpu, op);
}

static inline void
send_IPI_allbutself(enum ipi_message_type op)
{
	int i;
	
	for (i = 0; i < NR_CPUS; i++) {
		if (cpu_online(i) && i != smp_processor_id())
			send_IPI_single(i, op);
	}
}


inline void 
smp_send_stop(void)	{ send_IPI_allbutself(IPI_CPU_STOP); }

static inline void
smp_send_start(void)	{ send_IPI_allbutself(IPI_CPU_START); }

void 
smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }


/**
 * Run a function on all other CPUs.
 *  <func>	The function to run. This must be fast and non-blocking.
 *  <info>	An arbitrary pointer to pass to the function.
 *  <retry>	If true, keep retrying until ready.
 *  <wait>	If true, wait until function has completed on other CPUs.
 *  [RETURNS]   0 on success, else a negative status code.
 *
 * Does not return until remote CPUs are nearly ready to execute <func>
 * or have executed.
 */

int
smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
{
	struct smp_call_struct data;
	unsigned long timeout;
	static DEFINE_SPINLOCK(lock);
	int retries = 0;

	if (num_online_cpus() < 2)
		return 0;

	/* Can deadlock when called with interrupts disabled */
	WARN_ON(irqs_disabled());
	
	data.func = func;
	data.info = info;
	data.wait = wait;
	atomic_set(&data.unstarted_count, num_online_cpus() - 1);
	atomic_set(&data.unfinished_count, num_online_cpus() - 1);

	if (retry) {
		spin_lock (&lock);
		while (smp_call_function_data != 0)
			barrier();
	}
	else {
		spin_lock (&lock);
		if (smp_call_function_data) {
			spin_unlock (&lock);
			return -EBUSY;
		}
	}

	smp_call_function_data = &data;
	spin_unlock (&lock);
	
	/*  Send a message to all other CPUs and wait for them to respond  */
	send_IPI_allbutself(IPI_CALL_FUNC);

 retry:
	/*  Wait for response  */
	timeout = jiffies + HZ;
	while ( (atomic_read (&data.unstarted_count) > 0) &&
		time_before (jiffies, timeout) )
		barrier ();

	if (atomic_read (&data.unstarted_count) > 0) {
		printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n",
		      smp_processor_id(), ++retries);
		goto retry;
	}
	/* We either got one or timed out. Release the lock */

	mb();
	smp_call_function_data = NULL;

	while (wait && atomic_read (&data.unfinished_count) > 0)
			barrier ();

	return 0;
}

EXPORT_SYMBOL(smp_call_function);

/*
 * Flush all other CPU's tlb and then mine.  Do this with on_each_cpu()
 * as we want to ensure all TLB's flushed before proceeding.
 */

extern void flush_tlb_all_local(void);

void
smp_flush_tlb_all(void)
{
	on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
}


void 
smp_do_timer(struct pt_regs *regs)
{
	int cpu = smp_processor_id();
	struct cpuinfo_parisc *data = &cpu_data[cpu];

        if (!--data->prof_counter) {
		data->prof_counter = data->prof_multiplier;
		update_process_times(user_mode(regs));
	}
}

/*
 * Called by secondaries to update state and initialize CPU registers.
 */
static void __init
smp_cpu_init(int cpunum)
{
	extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
	extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */

	/* Set modes and Enable floating point coprocessor */
	(void) init_per_cpu(cpunum);

	disable_sr_hashing();

	mb();

	/* Well, support 2.4 linux scheme as well. */
	if (cpu_test_and_set(cpunum, cpu_online_map))
	{
		extern void machine_halt(void); /* arch/parisc.../process.c */

		printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
		machine_halt();
	}  

	/* Initialise the idle task for this CPU */
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;
	if(current->mm)
		BUG();
	enter_lazy_tlb(&init_mm, current);

	init_IRQ();   /* make sure no IRQ's are enabled or pending */
}


/*
 * Slaves start using C here. Indirectly called from smp_slave_stext.
 * Do what start_kernel() and main() do for boot strap processor (aka monarch)
 */
void __init smp_callin(void)
{
	int slave_id = cpu_now_booting;
#if 0
	void *istack;
#endif

	smp_cpu_init(slave_id);
	preempt_disable();

#if 0	/* NOT WORKING YET - see entry.S */
	istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
	if (istack == NULL) {
	    printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
	    BUG();
	}
	mtctl(istack,31);
#endif

	flush_cache_all_local(); /* start with known state */
	flush_tlb_all_local();

	local_irq_enable();  /* Interrupts have been off until now */

	cpu_idle();      /* Wait for timer to schedule some work */

	/* NOTREACHED */
	panic("smp_callin() AAAAaaaaahhhh....\n");
}

/*
 * Bring one cpu online.
 */
int __init smp_boot_one_cpu(int cpuid)
{
	struct task_struct *idle;
	long timeout;

	/* 
	 * Create an idle task for this CPU.  Note the address wed* give 
	 * to kernel_thread is irrelevant -- it's going to start
	 * where OS_BOOT_RENDEVZ vector in SAL says to start.  But
	 * this gets all the other task-y sort of data structures set
	 * up like we wish.   We need to pull the just created idle task 
	 * off the run queue and stuff it into the init_tasks[] array.  
	 * Sheesh . . .
	 */

	idle = fork_idle(cpuid);
	if (IS_ERR(idle))
		panic("SMP: fork failed for CPU:%d", cpuid);

	idle->thread_info->cpu = cpuid;

	/* Let _start know what logical CPU we're booting
	** (offset into init_tasks[],cpu_data[])
	*/
	cpu_now_booting = cpuid;

	/* 
	** boot strap code needs to know the task address since
	** it also contains the process stack.
	*/
	smp_init_current_idle_task = idle ;
	mb();

	printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa);

	/*
	** This gets PDC to release the CPU from a very tight loop.
	**
	** From the PA-RISC 2.0 Firmware Architecture Reference Specification:
	** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which 
	** is executed after receiving the rendezvous signal (an interrupt to 
	** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the 
	** contents of memory are valid."
	*/
	gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa);
	mb();

	/* 
	 * OK, wait a bit for that CPU to finish staggering about. 
	 * Slave will set a bit when it reaches smp_cpu_init().
	 * Once the "monarch CPU" sees the bit change, it can move on.
	 */
	for (timeout = 0; timeout < 10000; timeout++) {
		if(cpu_online(cpuid)) {
			/* Which implies Slave has started up */
			cpu_now_booting = 0;
			smp_init_current_idle_task = NULL;
			goto alive ;
		}
		udelay(100);
		barrier();
	}

	put_task_struct(idle);
	idle = NULL;

	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
	return -1;

alive:
	/* Remember the Slave data */
#if (kDEBUG>=100)
	printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
		cpuid, timeout * 100);
#endif /* kDEBUG */
#ifdef ENTRY_SYS_CPUS
	cpu_data[cpuid].state = STATE_RUNNING;
#endif
	return 0;
}

void __devinit smp_prepare_boot_cpu(void)
{
	int bootstrap_processor=cpu_data[0].cpuid;	/* CPU ID of BSP */

#ifdef ENTRY_SYS_CPUS
	cpu_data[0].state = STATE_RUNNING;
#endif

	/* Setup BSP mappings */
	printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);

	cpu_set(bootstrap_processor, cpu_online_map);
	cpu_set(bootstrap_processor, cpu_present_map);
}


/*
** inventory.c:do_inventory() hasn't yet been run and thus we
** don't 'discover' the additional CPU's until later.
*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
	cpus_clear(cpu_present_map);
	cpu_set(0, cpu_present_map);

	parisc_max_cpus = max_cpus;
	if (!max_cpus)
		printk(KERN_INFO "SMP mode deactivated.\n");
}


void smp_cpus_done(unsigned int cpu_max)
{
	return;
}


int __devinit __cpu_up(unsigned int cpu)
{
	if (cpu != 0 && cpu < parisc_max_cpus)
		smp_boot_one_cpu(cpu);

	return cpu_online(cpu) ? 0 : -ENOSYS;
}


#ifdef ENTRY_SYS_CPUS
/* Code goes along with:
**    entry.s:        ENTRY_NAME(sys_cpus)   / * 215, for cpu stat * /
*/
int sys_cpus(int argc, char **argv)
{
	int i,j=0;
	extern int current_pid(int cpu);

	if( argc > 2 ) {
		printk("sys_cpus:Only one argument supported\n");
		return (-1);
	}
	if ( argc == 1 ){
	
#ifdef DUMP_MORE_STATE
		for(i=0; i<NR_CPUS; i++) {
			int cpus_per_line = 4;
			if(cpu_online(i)) {
				if (j++ % cpus_per_line)
					printk(" %3d",i);
				else
					printk("\n %3d",i);
			}
		}
		printk("\n"); 
#else
	    	printk("\n 0\n"); 
#endif
	} else if((argc==2) && !(strcmp(argv[1],"-l"))) {
		printk("\nCPUSTATE  TASK CPUNUM CPUID HARDCPU(HPA)\n");
#ifdef DUMP_MORE_STATE
		for(i=0;i<NR_CPUS;i++) {
			if (!cpu_online(i))
				continue;
			if (cpu_data[i].cpuid != NO_PROC_ID) {
				switch(cpu_data[i].state) {
					case STATE_RENDEZVOUS:
						printk("RENDEZVS ");
						break;
					case STATE_RUNNING:
						printk((current_pid(i)!=0) ? "RUNNING  " : "IDLING   ");
						break;
					case STATE_STOPPED:
						printk("STOPPED  ");
						break;
					case STATE_HALTED:
						printk("HALTED   ");
						break;
					default:
						printk("%08x?", cpu_data[i].state);
						break;
				}
				if(cpu_online(i)) {
					printk(" %4d",current_pid(i));
				}	
				printk(" %6d",cpu_number_map(i));
				printk(" %5d",i);
				printk(" 0x%lx\n",cpu_data[i].hpa);
			}	
		}
#else
		printk("\n%s  %4d      0     0 --------",
			(current->pid)?"RUNNING ": "IDLING  ",current->pid); 
#endif
	} else if ((argc==2) && !(strcmp(argv[1],"-s"))) { 
#ifdef DUMP_MORE_STATE
     		printk("\nCPUSTATE   CPUID\n");
		for (i=0;i<NR_CPUS;i++) {
			if (!cpu_online(i))
				continue;
			if (cpu_data[i].cpuid != NO_PROC_ID) {
				switch(cpu_data[i].state) {
					case STATE_RENDEZVOUS:
						printk("RENDEZVS");break;
					case STATE_RUNNING:
						printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
						break;
					case STATE_STOPPED:
						printk("STOPPED ");break;
					case STATE_HALTED:
						printk("HALTED  ");break;
					default:
				}
				printk("  %5d\n",i);
			}	
		}
#else
		printk("\n%s    CPU0",(current->pid==0)?"RUNNING ":"IDLING  "); 
#endif
	} else {
		printk("sys_cpus:Unknown request\n");
		return (-1);
	}
	return 0;
}
#endif /* ENTRY_SYS_CPUS */

#ifdef CONFIG_PROC_FS
int __init
setup_profiling_timer(unsigned int multiplier)
{
	return -EINVAL;
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	** SMP Support
	3	**
	4	** Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	5	** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
	6	** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org>
	7	**
	8	** Lots of stuff stolen from arch/alpha/kernel/smp.c
	9	** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^)
	10	**
	11	** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work.
	12	** -grant (1/12/2001)
	13	**
	14	** This program is free software; you can redistribute it and/or modify
	15	** it under the terms of the GNU General Public License as published by
	16	** the Free Software Foundation; either version 2 of the License, or
	17	** (at your option) any later version.
	18	*/
	19	#undef ENTRY_SYS_CPUS /* syscall support for iCOD-like functionality */
	20
413059f2	21	#include <linux/config.h>
1da177e4 LT	22
	23	#include <linux/types.h>
	24	#include <linux/spinlock.h>
	25	#include <linux/slab.h>
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/sched.h>
	30	#include <linux/init.h>
	31	#include <linux/interrupt.h>
	32	#include <linux/smp.h>
	33	#include <linux/kernel_stat.h>
	34	#include <linux/mm.h>
	35	#include <linux/delay.h>
	36	#include <linux/bitops.h>
	37
	38	#include <asm/system.h>
	39	#include <asm/atomic.h>
	40	#include <asm/current.h>
	41	#include <asm/delay.h>
	42	#include <asm/pgalloc.h> /* for flush_tlb_all() proto/macro */
	43
	44	#include <asm/io.h>
	45	#include <asm/irq.h> /* for CPU_IRQ_REGION and friends */
	46	#include <asm/mmu_context.h>
	47	#include <asm/page.h>
	48	#include <asm/pgtable.h>
	49	#include <asm/pgalloc.h>
	50	#include <asm/processor.h>
	51	#include <asm/ptrace.h>
	52	#include <asm/unistd.h>
	53	#include <asm/cacheflush.h>
	54
	55	#define kDEBUG 0
	56
	57	DEFINE_SPINLOCK(smp_lock);
	58
	59	volatile struct task_struct *smp_init_current_idle_task;
	60
	61	static volatile int cpu_now_booting = 0; /* track which CPU is booting */
	62
	63	static int parisc_max_cpus = 1;
	64
	65	/* online cpus are ones that we've managed to bring up completely
	66	* possible cpus are all valid cpu
	67	* present cpus are all detected cpu
	68	*
	69	* On startup we bring up the "possible" cpus. Since we discover
	70	* CPUs later, we add them as hotplug, so the possible cpu mask is
	71	* empty in the beginning.
	72	*/
	73
	74	cpumask_t cpu_online_map = CPU_MASK_NONE; /* Bitmap of online CPUs */
	75	cpumask_t cpu_possible_map = CPU_MASK_ALL; /* Bitmap of Present CPUs */
	76
	77	EXPORT_SYMBOL(cpu_online_map);
	78	EXPORT_SYMBOL(cpu_possible_map);
	79
	80
	81	struct smp_call_struct {
	82	void (func) (void info);
	83	void *info;
	84	long wait;
	85	atomic_t unstarted_count;
86	atomic_t unfinished_count;
87	};
88	static volatile struct smp_call_struct *smp_call_function_data;
89
90	enum ipi_message_type {
91	IPI_NOP=0,
92	IPI_RESCHEDULE=1,
93	IPI_CALL_FUNC,
94	IPI_CPU_START,
95	IPI_CPU_STOP,
96	IPI_CPU_TEST
97	};
98
99
100	/********** SMP inter processor interrupt and communication routines */
101
102	#undef PER_CPU_IRQ_REGION
103	#ifdef PER_CPU_IRQ_REGION
104	/* XXX REVISIT Ignore for now.
105	** May need this "hook" to register IPI handler
106	** once we have perCPU ExtIntr switch tables.
107	*/
108	static void
109	ipi_init(int cpuid)
110	{
111
112	/* If CPU is present ... */
113	#ifdef ENTRY_SYS_CPUS
114	/* and running (not stopped) ... */
115	#error iCOD support wants state checked here.
116	#endif
117
118	#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
119
120	if(cpu_online(cpuid) )
121	{
122	switch_to_idle_task(current);
123	}
124
125	return;
126	}
127	#endif
128
129
130	/*
131	** Yoink this CPU from the runnable list...
132	**
133	*/
134	static void
135	halt_processor(void)
136	{
137	#ifdef ENTRY_SYS_CPUS
138	#error halt_processor() needs rework
139	/*
140	** o migrate I/O interrupts off this CPU.
141	** o leave IPI enabled - __cli() will disable IPI.
142	** o leave CPU in online map - just change the state
143	*/
144	cpu_data[this_cpu].state = STATE_STOPPED;
145	mark_bh(IPI_BH);
146	#else
147	/* REVISIT : redirect I/O Interrupts to another CPU? */
148	/* REVISIT : does PM know this CPU isn't available? */
149	cpu_clear(smp_processor_id(), cpu_online_map);
150	local_irq_disable();
151	for (;;)
152	;
153	#endif
154	}
155
156
157	irqreturn_t
158	ipi_interrupt(int irq, void dev_id, struct pt_regs regs)
159	{
160	int this_cpu = smp_processor_id();
161	struct cpuinfo_parisc *p = &cpu_data[this_cpu];
162	unsigned long ops;
163	unsigned long flags;
164
165	/* Count this now; we may make a call that never returns. */
166	p->ipi_count++;
167
168	mb(); /* Order interrupt and bit testing. */
169
170	for (;;) {
171	spin_lock_irqsave(&(p->lock),flags);
172	ops = p->pending_ipi;
173	p->pending_ipi = 0;
174	spin_unlock_irqrestore(&(p->lock),flags);
175
176	mb(); /* Order bit clearing and data access. */
177
178	if (!ops)
179	break;
180
181	while (ops) {
182	unsigned long which = ffz(~ops);
183
184	switch (which) {
185	case IPI_RESCHEDULE:
186	#if (kDEBUG>=100)
187	printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
188	#endif /* kDEBUG */
189	ops &= ~(1 << IPI_RESCHEDULE);
190	/*
191	* Reschedule callback. Everything to be
192	* done is done by the interrupt return path.
193	*/
194	break;
195
196	case IPI_CALL_FUNC:
197	#if (kDEBUG>=100)
198	printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
199	#endif /* kDEBUG */
200	ops &= ~(1 << IPI_CALL_FUNC);
201	{
202	volatile struct smp_call_struct *data;
203	void (func)(void info);
204	void *info;
205	int wait;
206
207	data = smp_call_function_data;
208	func = data->func;
209	info = data->info;
210	wait = data->wait;
211
212	mb();
213	atomic_dec ((atomic_t *)&data->unstarted_count);
214
215	/* At this point, *data can't
216	* be relied upon.
217	*/
218
219	(*func)(info);
220
221	/* Notify the sending CPU that the
222	* task is done.
223	*/
224	mb();
225	if (wait)
226	atomic_dec ((atomic_t *)&data->unfinished_count);
227	}
228	break;
229
230	case IPI_CPU_START:
231	#if (kDEBUG>=100)
232	printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
233	#endif /* kDEBUG */
234	ops &= ~(1 << IPI_CPU_START);
235	#ifdef ENTRY_SYS_CPUS
236	p->state = STATE_RUNNING;
237	#endif
238	break;
239
240	case IPI_CPU_STOP:
241	#if (kDEBUG>=100)
242	printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
243	#endif /* kDEBUG */
244	ops &= ~(1 << IPI_CPU_STOP);
245	#ifdef ENTRY_SYS_CPUS
246	#else
247	halt_processor();
248	#endif
249	break;
250
251	case IPI_CPU_TEST:
252	#if (kDEBUG>=100)
253	printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
254	#endif /* kDEBUG */
255	ops &= ~(1 << IPI_CPU_TEST);
256	break;
257
258	default:
259	printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
260	this_cpu, which);
261	ops &= ~(1 << which);
262	return IRQ_NONE;
263	} /* Switch */
264	} /* while (ops) */
265	}
266	return IRQ_HANDLED;
267	}
268
269
270	static inline void
271	ipi_send(int cpu, enum ipi_message_type op)
272	{
273	struct cpuinfo_parisc *p = &cpu_data[cpu];
274	unsigned long flags;
275
276	spin_lock_irqsave(&(p->lock),flags);
277	p->pending_ipi \|= 1 << op;
278	gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
279	spin_unlock_irqrestore(&(p->lock),flags);
280	}
281
282
283	static inline void
284	send_IPI_single(int dest_cpu, enum ipi_message_type op)
285	{
286	if (dest_cpu == NO_PROC_ID) {
287	BUG();
288	return;
289	}
290
291	ipi_send(dest_cpu, op);
292	}
293
294	static inline void
295	send_IPI_allbutself(enum ipi_message_type op)
296	{
297	int i;
298
299	for (i = 0; i < NR_CPUS; i++) {
300	if (cpu_online(i) && i != smp_processor_id())
301	send_IPI_single(i, op);
302	}
303	}
304
305
306	inline void
307	smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); }
308
309	static inline void
310	smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); }
311
312	void
313	smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
314
315
316	/**
317	* Run a function on all other CPUs.
318	* <func> The function to run. This must be fast and non-blocking.
319	* <info> An arbitrary pointer to pass to the function.
320	* <retry> If true, keep retrying until ready.
321	* <wait> If true, wait until function has completed on other CPUs.
322	* [RETURNS] 0 on success, else a negative status code.
323	*
324	* Does not return until remote CPUs are nearly ready to execute <func>
325	* or have executed.
326	*/
327
328	int
329	smp_call_function (void (func) (void info), void *info, int retry, int wait)
330	{
331	struct smp_call_struct data;
332	unsigned long timeout;
333	static DEFINE_SPINLOCK(lock);
334	int retries = 0;
335
336	if (num_online_cpus() < 2)
337	return 0;
338
339	/* Can deadlock when called with interrupts disabled */
340	WARN_ON(irqs_disabled());
341
342	data.func = func;
343	data.info = info;
344	data.wait = wait;
345	atomic_set(&data.unstarted_count, num_online_cpus() - 1);
346	atomic_set(&data.unfinished_count, num_online_cpus() - 1);
347
348	if (retry) {
349	spin_lock (&lock);
350	while (smp_call_function_data != 0)
351	barrier();
352	}
353	else {
354	spin_lock (&lock);
355	if (smp_call_function_data) {
356	spin_unlock (&lock);
357	return -EBUSY;
358	}
359	}
360
361	smp_call_function_data = &data;
362	spin_unlock (&lock);
363
364	/* Send a message to all other CPUs and wait for them to respond */
365	send_IPI_allbutself(IPI_CALL_FUNC);
366
367	retry:
368	/* Wait for response */
369	timeout = jiffies + HZ;
370	while ( (atomic_read (&data.unstarted_count) > 0) &&
371	time_before (jiffies, timeout) )
372	barrier ();
373
374	if (atomic_read (&data.unstarted_count) > 0) {
375	printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n",
376	smp_processor_id(), ++retries);
377	goto retry;
378	}
379	/* We either got one or timed out. Release the lock */
380
381	mb();
382	smp_call_function_data = NULL;
383
384	while (wait && atomic_read (&data.unfinished_count) > 0)
385	barrier ();
386
387	return 0;
388	}
389
390	EXPORT_SYMBOL(smp_call_function);
391
392	/*
393	* Flush all other CPU's tlb and then mine. Do this with on_each_cpu()
394	* as we want to ensure all TLB's flushed before proceeding.
395	*/
396
397	extern void flush_tlb_all_local(void);
398
399	void
400	smp_flush_tlb_all(void)
401	{
402	on_each_cpu((void ()(void ))flush_tlb_all_local, NULL, 1, 1);
403	}
404
405
406	void
407	smp_do_timer(struct pt_regs *regs)
408	{
409	int cpu = smp_processor_id();
410	struct cpuinfo_parisc *data = &cpu_data[cpu];
411
412	if (!--data->prof_counter) {
413	data->prof_counter = data->prof_multiplier;
414	update_process_times(user_mode(regs));
415	}
416	}
417
418	/*
419	* Called by secondaries to update state and initialize CPU registers.
420	*/
421	static void __init
422	smp_cpu_init(int cpunum)
423	{
424	extern int init_per_cpu(int); /* arch/parisc/kernel/setup.c */
425	extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */
426
427	/* Set modes and Enable floating point coprocessor */
428	(void) init_per_cpu(cpunum);
429
430	disable_sr_hashing();
431
432	mb();
433
434	/* Well, support 2.4 linux scheme as well. */
435	if (cpu_test_and_set(cpunum, cpu_online_map))
436	{
437	extern void machine_halt(void); /* arch/parisc.../process.c */
438
439	printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
440	machine_halt();
441	}
442
443	/* Initialise the idle task for this CPU */
444	atomic_inc(&init_mm.mm_count);
445	current->active_mm = &init_mm;
446	if(current->mm)
447	BUG();
448	enter_lazy_tlb(&init_mm, current);
449
450	init_IRQ(); /* make sure no IRQ's are enabled or pending */
451	}
452
453
454	/*
455	* Slaves start using C here. Indirectly called from smp_slave_stext.
456	* Do what start_kernel() and main() do for boot strap processor (aka monarch)
457	*/
458	void __init smp_callin(void)
459	{
460	int slave_id = cpu_now_booting;
461	#if 0
462	void *istack;
463	#endif
464
465	smp_cpu_init(slave_id);
5bfb5d69	466	preempt_disable();
1da177e4 LT	467
	468	#if 0 /* NOT WORKING YET - see entry.S */
	469	istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
	470	if (istack == NULL) {
	471	printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
	472	BUG();
	473	}
	474	mtctl(istack,31);
	475	#endif
	476
	477	flush_cache_all_local(); /* start with known state */
	478	flush_tlb_all_local();
	479
	480	local_irq_enable(); /* Interrupts have been off until now */
	481
	482	cpu_idle(); /* Wait for timer to schedule some work */
	483
	484	/* NOTREACHED */
	485	panic("smp_callin() AAAAaaaaahhhh....\n");
	486	}
	487
	488	/*
	489	* Bring one cpu online.
	490	*/
	491	int __init smp_boot_one_cpu(int cpuid)
	492	{
	493	struct task_struct *idle;
	494	long timeout;
	495
	496	/*
	497	* Create an idle task for this CPU. Note the address wed* give
	498	* to kernel_thread is irrelevant -- it's going to start
	499	* where OS_BOOT_RENDEVZ vector in SAL says to start. But
	500	* this gets all the other task-y sort of data structures set
	501	* up like we wish. We need to pull the just created idle task
	502	* off the run queue and stuff it into the init_tasks[] array.
	503	* Sheesh . . .
	504	*/
	505
	506	idle = fork_idle(cpuid);
	507	if (IS_ERR(idle))
	508	panic("SMP: fork failed for CPU:%d", cpuid);
	509
	510	idle->thread_info->cpu = cpuid;
	511
	512	/* Let _start know what logical CPU we're booting
	513	** (offset into init_tasks[],cpu_data[])
	514	*/
	515	cpu_now_booting = cpuid;
	516
	517	/*
	518	** boot strap code needs to know the task address since
	519	** it also contains the process stack.
	520	*/
	521	smp_init_current_idle_task = idle ;
	522	mb();
	523
	524	printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa);
	525
	526	/*
	527	** This gets PDC to release the CPU from a very tight loop.
	528	**
	529	** From the PA-RISC 2.0 Firmware Architecture Reference Specification:
	530	** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which
531	** is executed after receiving the rendezvous signal (an interrupt to
532	** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the
533	** contents of memory are valid."
534	*/
535	gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa);
536	mb();
537
538	/*
539	* OK, wait a bit for that CPU to finish staggering about.
540	* Slave will set a bit when it reaches smp_cpu_init().
541	* Once the "monarch CPU" sees the bit change, it can move on.
542	*/
543	for (timeout = 0; timeout < 10000; timeout++) {
544	if(cpu_online(cpuid)) {
545	/* Which implies Slave has started up */
546	cpu_now_booting = 0;
547	smp_init_current_idle_task = NULL;
548	goto alive ;
549	}
550	udelay(100);
551	barrier();
552	}
553
554	put_task_struct(idle);
555	idle = NULL;
556
557	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
558	return -1;
559
560	alive:
561	/* Remember the Slave data */
562	#if (kDEBUG>=100)
563	printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
564	cpuid, timeout * 100);
565	#endif /* kDEBUG */
566	#ifdef ENTRY_SYS_CPUS
567	cpu_data[cpuid].state = STATE_RUNNING;
568	#endif
569	return 0;
570	}
571
572	void __devinit smp_prepare_boot_cpu(void)
573	{
574	int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */
575
576	#ifdef ENTRY_SYS_CPUS
577	cpu_data[0].state = STATE_RUNNING;
578	#endif
579
580	/* Setup BSP mappings */
581	printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
582
583	cpu_set(bootstrap_processor, cpu_online_map);
584	cpu_set(bootstrap_processor, cpu_present_map);
585	}
586
587
588
589	/*
590	** inventory.c:do_inventory() hasn't yet been run and thus we
591	** don't 'discover' the additional CPU's until later.
592	*/
593	void __init smp_prepare_cpus(unsigned int max_cpus)
594	{
595	cpus_clear(cpu_present_map);
596	cpu_set(0, cpu_present_map);
597
598	parisc_max_cpus = max_cpus;
599	if (!max_cpus)
600	printk(KERN_INFO "SMP mode deactivated.\n");
601	}
602
603
604	void smp_cpus_done(unsigned int cpu_max)
605	{
606	return;
607	}
608
609
610	int __devinit __cpu_up(unsigned int cpu)
611	{
612	if (cpu != 0 && cpu < parisc_max_cpus)
613	smp_boot_one_cpu(cpu);
614
615	return cpu_online(cpu) ? 0 : -ENOSYS;
616	}
617
618
619
620	#ifdef ENTRY_SYS_CPUS
621	/* Code goes along with:
622	** entry.s: ENTRY_NAME(sys_cpus) / * 215, for cpu stat * /
623	*/
624	int sys_cpus(int argc, char **argv)
625	{
626	int i,j=0;
627	extern int current_pid(int cpu);
628
629	if( argc > 2 ) {
630	printk("sys_cpus:Only one argument supported\n");
631	return (-1);
632	}
633	if ( argc == 1 ){
634
635	#ifdef DUMP_MORE_STATE
636	for(i=0; i<NR_CPUS; i++) {
637	int cpus_per_line = 4;
638	if(cpu_online(i)) {
639	if (j++ % cpus_per_line)
640	printk(" %3d",i);
641	else
642	printk("\n %3d",i);
643	}
644	}
645	printk("\n");
646	#else
647	printk("\n 0\n");
648	#endif
649	} else if((argc==2) && !(strcmp(argv[1],"-l"))) {
650	printk("\nCPUSTATE TASK CPUNUM CPUID HARDCPU(HPA)\n");
651	#ifdef DUMP_MORE_STATE
652	for(i=0;i<NR_CPUS;i++) {
653	if (!cpu_online(i))
654	continue;
655	if (cpu_data[i].cpuid != NO_PROC_ID) {
656	switch(cpu_data[i].state) {
657	case STATE_RENDEZVOUS:
658	printk("RENDEZVS ");
659	break;
660	case STATE_RUNNING:
661	printk((current_pid(i)!=0) ? "RUNNING " : "IDLING ");
662	break;
663	case STATE_STOPPED:
664	printk("STOPPED ");
665	break;
666	case STATE_HALTED:
667	printk("HALTED ");
668	break;
669	default:
670	printk("%08x?", cpu_data[i].state);
671	break;
672	}
673	if(cpu_online(i)) {
674	printk(" %4d",current_pid(i));
675	}
676	printk(" %6d",cpu_number_map(i));
677	printk(" %5d",i);
678	printk(" 0x%lx\n",cpu_data[i].hpa);
679	}
680	}
681	#else
682	printk("\n%s %4d 0 0 --------",
683	(current->pid)?"RUNNING ": "IDLING ",current->pid);
684	#endif
685	} else if ((argc==2) && !(strcmp(argv[1],"-s"))) {
686	#ifdef DUMP_MORE_STATE
687	printk("\nCPUSTATE CPUID\n");
688	for (i=0;i<NR_CPUS;i++) {
689	if (!cpu_online(i))
690	continue;
691	if (cpu_data[i].cpuid != NO_PROC_ID) {
692	switch(cpu_data[i].state) {
693	case STATE_RENDEZVOUS:
694	printk("RENDEZVS");break;
695	case STATE_RUNNING:
696	printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
697	break;
698	case STATE_STOPPED:
699	printk("STOPPED ");break;
700	case STATE_HALTED:
701	printk("HALTED ");break;
702	default:
703	}
704	printk(" %5d\n",i);
705	}
706	}
707	#else
708	printk("\n%s CPU0",(current->pid==0)?"RUNNING ":"IDLING ");
709	#endif
710	} else {
711	printk("sys_cpus:Unknown request\n");
712	return (-1);
713	}
714	return 0;
715	}
716	#endif /* ENTRY_SYS_CPUS */
717
718	#ifdef CONFIG_PROC_FS
719	int __init
720	setup_profiling_timer(unsigned int multiplier)
721	{
722	return -EINVAL;
723	}
724	#endif