[linux-2.6-block.git] / arch / parisc / kernel / smp.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
** 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 a lot from their work.
** -grant (1/12/2001)
**
*/
#include <linux/types.h>
#include <linux/spinlock.h>

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

#include <linux/atomic.h>
#include <asm/current.h>
#include <asm/delay.h>
#include <asm/tlbflush.h>

#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>

#undef DEBUG_SMP
#ifdef DEBUG_SMP
static int smp_debug_lvl = 0;
#define smp_debug(lvl, printargs...)		\
		if (lvl >= smp_debug_lvl)	\
			printk(printargs);
#else
#define smp_debug(lvl, ...)	do { } while(0)
#endif /* DEBUG_SMP */

volatile struct task_struct *smp_init_current_idle_task;

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

static int parisc_max_cpus = 1;

static DEFINE_PER_CPU(spinlock_t, ipi_lock);

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)
{
#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) 
{
	/* REVISIT : redirect I/O Interrupts to another CPU? */
	/* REVISIT : does PM *know* this CPU isn't available? */
	set_cpu_online(smp_processor_id(), false);
	local_irq_disable();
	for (;;)
		;
}


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

	for (;;) {
		spinlock_t *lock = &per_cpu(ipi_lock, this_cpu);
		spin_lock_irqsave(lock, flags);
		ops = p->pending_ipi;
		p->pending_ipi = 0;
		spin_unlock_irqrestore(lock, flags);

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

		if (!ops)
		    break;

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

			ops &= ~(1 << which);

			switch (which) {
			case IPI_NOP:
				smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu);
				break;
				
			case IPI_RESCHEDULE:
				smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
				inc_irq_stat(irq_resched_count);
				scheduler_ipi();
				break;

			case IPI_CALL_FUNC:
				smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
				inc_irq_stat(irq_call_count);
				generic_smp_call_function_interrupt();
				break;

			case IPI_CPU_START:
				smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu);
				break;

			case IPI_CPU_STOP:
				smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu);
				halt_processor();
				break;

			case IPI_CPU_TEST:
				smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
				break;

			default:
				printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
					this_cpu, which);
				return IRQ_NONE;
			} /* Switch */
		/* let in any pending interrupts */
		local_irq_enable();
		local_irq_disable();
		} /* while (ops) */
	}
	return IRQ_HANDLED;
}


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

	spin_lock_irqsave(lock, flags);
	p->pending_ipi |= 1 << op;
	gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa);
	spin_unlock_irqrestore(lock, flags);
}

static void
send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op)
{
	int cpu;

	for_each_cpu(cpu, mask)
		ipi_send(cpu, op);
}

static inline void
send_IPI_single(int dest_cpu, enum ipi_message_type op)
{
	BUG_ON(dest_cpu == NO_PROC_ID);

	ipi_send(dest_cpu, op);
}

static inline void
send_IPI_allbutself(enum ipi_message_type op)
{
	int i;
	
	for_each_online_cpu(i) {
		if (i != smp_processor_id())
			send_IPI_single(i, op);
	}
}


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

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

void
smp_send_all_nop(void)
{
	send_IPI_allbutself(IPI_NOP);
}

void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
	send_IPI_mask(mask, IPI_CALL_FUNC);
}

void arch_send_call_function_single_ipi(int cpu)
{
	send_IPI_single(cpu, IPI_CALL_FUNC);
}

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

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

	disable_sr_hashing();

	mb();

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

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

	notify_cpu_starting(cpunum);

	set_cpu_online(cpunum, true);

	/* Initialise the idle task for this CPU */
	mmgrab(&init_mm);
	current->active_mm = &init_mm;
	BUG_ON(current->mm);
	enter_lazy_tlb(&init_mm, current);

	init_IRQ();   /* make sure no IRQs are enabled or pending */
	start_cpu_itimer();
}


/*
 * 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(unsigned long pdce_proc)
{
	int slave_id = cpu_now_booting;

#ifdef CONFIG_64BIT
	WARN_ON(((unsigned long)(PAGE0->mem_pdc_hi) << 32
			| PAGE0->mem_pdc) != pdce_proc);
#endif

	smp_cpu_init(slave_id);
	preempt_disable();

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

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

	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);

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

/*
 * Bring one cpu online.
 */
int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
{
	const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
	long timeout;

	task_thread_info(idle)->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(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->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, p->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();
	}
	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
	return -1;

alive:
	/* Remember the Slave data */
	smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
		cpuid, timeout * 100);
	return 0;
}

void __init smp_prepare_boot_cpu(void)
{
	int bootstrap_processor = per_cpu(cpu_data, 0).cpuid;

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

	set_cpu_online(bootstrap_processor, true);
	set_cpu_present(bootstrap_processor, true);
}


/*
** inventory.c:do_inventory() hasn't yet been run and thus we
** don't 'discover' the additional CPUs until later.
*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
	int cpu;

	for_each_possible_cpu(cpu)
		spin_lock_init(&per_cpu(ipi_lock, cpu));

	init_cpu_present(cpumask_of(0));

	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 __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
	if (cpu != 0 && cpu < parisc_max_cpus && smp_boot_one_cpu(cpu, tidle))
		return -ENOSYS;

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

#ifdef CONFIG_PROC_FS
int setup_profiling_timer(unsigned int multiplier)
{
	return -EINVAL;
}
#endif
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	** SMP Support
	4	**
	5	** Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	6	** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
	7	** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org>
	8	**
	9	** Lots of stuff stolen from arch/alpha/kernel/smp.c
	10	** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^)
	11	**
7022672e	12	** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work.
1da177e4 LT	13	** -grant (1/12/2001)
1da177e4 LT	14	**
1da177e4	15	*/
1da177e4 LT	16	#include <linux/types.h>
1da177e4 LT	17	#include <linux/spinlock.h>
1da177e4 LT	18
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
68e21be2	21	#include <linux/sched/mm.h>
1da177e4 LT	22	#include <linux/init.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/smp.h>
	25	#include <linux/kernel_stat.h>
	26	#include <linux/mm.h>
4e950f6f	27	#include <linux/err.h>
1da177e4 LT	28	#include <linux/delay.h>
1da177e4 LT	29	#include <linux/bitops.h>
d75f054a	30	#include <linux/ftrace.h>
ec2e0f98	31	#include <linux/cpu.h>
1da177e4	32
60063497	33	#include <linux/atomic.h>
1da177e4 LT	34	#include <asm/current.h>
1da177e4 LT	35	#include <asm/delay.h>
1b2425e3	36	#include <asm/tlbflush.h>
1da177e4 LT	37
	38	#include <asm/io.h>
	39	#include <asm/irq.h> /* for CPU_IRQ_REGION and friends */
	40	#include <asm/mmu_context.h>
	41	#include <asm/page.h>
	42	#include <asm/pgtable.h>
	43	#include <asm/pgalloc.h>
	44	#include <asm/processor.h>
	45	#include <asm/ptrace.h>
	46	#include <asm/unistd.h>
	47	#include <asm/cacheflush.h>
	48
5492a0f0 KM	49	#undef DEBUG_SMP
	50	#ifdef DEBUG_SMP
	51	static int smp_debug_lvl = 0;
	52	#define smp_debug(lvl, printargs...) \
	53	if (lvl >= smp_debug_lvl) \
	54	printk(printargs);
	55	#else
ef017beb	56	#define smp_debug(lvl, ...) do { } while(0)
5492a0f0	57	#endif /* DEBUG_SMP */
1da177e4	58
1da177e4 LT	59	volatile struct task_struct *smp_init_current_idle_task;
1da177e4 LT	60
ef017beb	61	/* track which CPU is booting */
60ffef06	62	static volatile int cpu_now_booting;
1da177e4	63
60ffef06	64	static int parisc_max_cpus = 1;
1da177e4	65
6ad6c424	66	static DEFINE_PER_CPU(spinlock_t, ipi_lock);
1da177e4	67
1da177e4 LT	68	enum ipi_message_type {
	69	IPI_NOP=0,
	70	IPI_RESCHEDULE=1,
	71	IPI_CALL_FUNC,
	72	IPI_CPU_START,
	73	IPI_CPU_STOP,
	74	IPI_CPU_TEST
	75	};
	76
	77
	78	/********** SMP inter processor interrupt and communication routines */
	79
	80	#undef PER_CPU_IRQ_REGION
	81	#ifdef PER_CPU_IRQ_REGION
	82	/* XXX REVISIT Ignore for now.
	83	** May need this "hook" to register IPI handler
	84	** once we have perCPU ExtIntr switch tables.
	85	*/
	86	static void
	87	ipi_init(int cpuid)
	88	{
1da177e4 LT	89	#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
	90
	91	if(cpu_online(cpuid) )
	92	{
	93	switch_to_idle_task(current);
	94	}
	95
	96	return;
	97	}
	98	#endif
	99
	100
	101	/*
	102	** Yoink this CPU from the runnable list...
	103	**
	104	*/
	105	static void
	106	halt_processor(void)
	107	{
1da177e4 LT	108	/* REVISIT : redirect I/O Interrupts to another CPU? */
1da177e4 LT	109	/* REVISIT : does PM know this CPU isn't available? */
9bc181d8	110	set_cpu_online(smp_processor_id(), false);
1da177e4 LT	111	local_irq_disable();
	112	for (;;)
	113	;
1da177e4 LT	114	}
	115
	116
d75f054a	117	irqreturn_t __irq_entry
c7753f18	118	ipi_interrupt(int irq, void *dev_id)
1da177e4 LT	119	{
1da177e4 LT	120	int this_cpu = smp_processor_id();
ef017beb	121	struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu);
1da177e4 LT	122	unsigned long ops;
	123	unsigned long flags;
	124
1da177e4	125	for (;;) {
3c97b5e9 KM	126	spinlock_t *lock = &per_cpu(ipi_lock, this_cpu);
3c97b5e9 KM	127	spin_lock_irqsave(lock, flags);
1da177e4 LT	128	ops = p->pending_ipi;
1da177e4 LT	129	p->pending_ipi = 0;
3c97b5e9	130	spin_unlock_irqrestore(lock, flags);
1da177e4 LT	131
	132	mb(); /* Order bit clearing and data access. */
	133
	134	if (!ops)
	135	break;
	136
	137	while (ops) {
	138	unsigned long which = ffz(~ops);
	139
d911aed8 JB	140	ops &= ~(1 << which);
d911aed8 JB	141
1da177e4	142	switch (which) {
d911aed8	143	case IPI_NOP:
5492a0f0	144	smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu);
d911aed8 JB	145	break;
d911aed8 JB	146
1da177e4	147	case IPI_RESCHEDULE:
5492a0f0	148	smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
cd85d551	149	inc_irq_stat(irq_resched_count);
184748cc	150	scheduler_ipi();
1da177e4 LT	151	break;
	152
	153	case IPI_CALL_FUNC:
5492a0f0	154	smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
b102f29b	155	inc_irq_stat(irq_call_count);
dbcf4787 JA	156	generic_smp_call_function_interrupt();
	157	break;
	158
1da177e4	159	case IPI_CPU_START:
5492a0f0	160	smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu);
1da177e4 LT	161	break;
	162
	163	case IPI_CPU_STOP:
5492a0f0	164	smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu);
1da177e4	165	halt_processor();
1da177e4 LT	166	break;
	167
	168	case IPI_CPU_TEST:
5492a0f0	169	smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
1da177e4 LT	170	break;
	171
	172	default:
	173	printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
	174	this_cpu, which);
1da177e4 LT	175	return IRQ_NONE;
1da177e4 LT	176	} /* Switch */
7085689e JB	177	/* let in any pending interrupts */
	178	local_irq_enable();
	179	local_irq_disable();
1da177e4 LT	180	} /* while (ops) */
	181	}
	182	return IRQ_HANDLED;
	183	}
	184
	185
	186	static inline void
	187	ipi_send(int cpu, enum ipi_message_type op)
	188	{
ef017beb	189	struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu);
3c97b5e9	190	spinlock_t *lock = &per_cpu(ipi_lock, cpu);
1da177e4 LT	191	unsigned long flags;
1da177e4 LT	192
3c97b5e9	193	spin_lock_irqsave(lock, flags);
1da177e4	194	p->pending_ipi \|= 1 << op;
ef017beb	195	gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa);
3c97b5e9	196	spin_unlock_irqrestore(lock, flags);
1da177e4 LT	197	}
1da177e4 LT	198
dbcf4787	199	static void
91887a36	200	send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op)
dbcf4787 JA	201	{
	202	int cpu;
	203
91887a36	204	for_each_cpu(cpu, mask)
dbcf4787 JA	205	ipi_send(cpu, op);
dbcf4787 JA	206	}
1da177e4 LT	207
	208	static inline void
	209	send_IPI_single(int dest_cpu, enum ipi_message_type op)
	210	{
7f2347a4	211	BUG_ON(dest_cpu == NO_PROC_ID);
1da177e4 LT	212
	213	ipi_send(dest_cpu, op);
	214	}
	215
	216	static inline void
	217	send_IPI_allbutself(enum ipi_message_type op)
	218	{
	219	int i;
	220
394e3902 AM	221	for_each_online_cpu(i) {
394e3902 AM	222	if (i != smp_processor_id())
1da177e4 LT	223	send_IPI_single(i, op);
	224	}
	225	}
	226
	227
	228	inline void
	229	smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); }
	230
1da177e4 LT	231	void
	232	smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
	233
d911aed8 JB	234	void
	235	smp_send_all_nop(void)
	236	{
	237	send_IPI_allbutself(IPI_NOP);
	238	}
	239
91887a36	240	void arch_send_call_function_ipi_mask(const struct cpumask *mask)
1da177e4	241	{
dbcf4787	242	send_IPI_mask(mask, IPI_CALL_FUNC);
1da177e4 LT	243	}
1da177e4 LT	244
dbcf4787 JA	245	void arch_send_call_function_single_ipi(int cpu)
dbcf4787 JA	246	{
528d8eb2	247	send_IPI_single(cpu, IPI_CALL_FUNC);
dbcf4787	248	}
1da177e4	249
1da177e4 LT	250	/*
	251	* Called by secondaries to update state and initialize CPU registers.
	252	*/
	253	static void __init
	254	smp_cpu_init(int cpunum)
	255	{
1da177e4	256	extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */
56f335c8	257	extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */
1da177e4 LT	258
1da177e4 LT	259	/* Set modes and Enable floating point coprocessor */
a7e6601f	260	init_per_cpu(cpunum);
1da177e4 LT	261
	262	disable_sr_hashing();
	263
	264	mb();
	265
	266	/* Well, support 2.4 linux scheme as well. */
7ec6118c	267	if (cpu_online(cpunum)) {
1da177e4 LT	268	extern void machine_halt(void); /* arch/parisc.../process.c */
	269
	270	printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
	271	machine_halt();
ec2e0f98 SB	272	}
	273
	274	notify_cpu_starting(cpunum);
	275
9bc181d8	276	set_cpu_online(cpunum, true);
1da177e4 LT	277
1da177e4 LT	278	/* Initialise the idle task for this CPU */
f1f10076	279	mmgrab(&init_mm);
1da177e4	280	current->active_mm = &init_mm;
7f2347a4	281	BUG_ON(current->mm);
1da177e4 LT	282	enter_lazy_tlb(&init_mm, current);
1da177e4 LT	283
7022672e	284	init_IRQ(); /* make sure no IRQs are enabled or pending */
56f335c8	285	start_cpu_itimer();
1da177e4 LT	286	}
	287
	288
	289	/*
	290	* Slaves start using C here. Indirectly called from smp_slave_stext.
	291	* Do what start_kernel() and main() do for boot strap processor (aka monarch)
	292	*/
0ed1fe4a	293	void __init smp_callin(unsigned long pdce_proc)
1da177e4 LT	294	{
1da177e4 LT	295	int slave_id = cpu_now_booting;
1da177e4	296
0ed1fe4a HD	297	#ifdef CONFIG_64BIT
	298	WARN_ON(((unsigned long)(PAGE0->mem_pdc_hi) << 32
	299	\| PAGE0->mem_pdc) != pdce_proc);
	300	#endif
	301
1da177e4	302	smp_cpu_init(slave_id);
5bfb5d69	303	preempt_disable();
1da177e4	304
1da177e4	305	flush_cache_all_local(); /* start with known state */
1b2425e3	306	flush_tlb_all_local(NULL);
1da177e4 LT	307
	308	local_irq_enable(); /* Interrupts have been off until now */
	309
fc6d73d6	310	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
1da177e4 LT	311
	312	/* NOTREACHED */
	313	panic("smp_callin() AAAAaaaaahhhh....\n");
	314	}
	315
	316	/*
	317	* Bring one cpu online.
	318	*/
60ffef06	319	int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
1da177e4	320	{
ef017beb	321	const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
1da177e4 LT	322	long timeout;
1da177e4 LT	323
40f1f0de	324	task_thread_info(idle)->cpu = cpuid;
1da177e4 LT	325
	326	/* Let _start know what logical CPU we're booting
	327	** (offset into init_tasks[],cpu_data[])
	328	*/
	329	cpu_now_booting = cpuid;
	330
	331	/*
	332	** boot strap code needs to know the task address since
	333	** it also contains the process stack.
	334	*/
	335	smp_init_current_idle_task = idle ;
	336	mb();
	337
ef017beb	338	printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa);
1da177e4 LT	339
	340	/*
	341	** This gets PDC to release the CPU from a very tight loop.
	342	**
	343	** From the PA-RISC 2.0 Firmware Architecture Reference Specification:
	344	** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which
	345	** is executed after receiving the rendezvous signal (an interrupt to
	346	** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the
	347	** contents of memory are valid."
	348	*/
ef017beb	349	gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa);
1da177e4 LT	350	mb();
	351
	352	/*
	353	* OK, wait a bit for that CPU to finish staggering about.
	354	* Slave will set a bit when it reaches smp_cpu_init().
	355	* Once the "monarch CPU" sees the bit change, it can move on.
	356	*/
	357	for (timeout = 0; timeout < 10000; timeout++) {
	358	if(cpu_online(cpuid)) {
	359	/* Which implies Slave has started up */
	360	cpu_now_booting = 0;
	361	smp_init_current_idle_task = NULL;
	362	goto alive ;
	363	}
	364	udelay(100);
	365	barrier();
	366	}
1da177e4 LT	367	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
	368	return -1;
	369
	370	alive:
	371	/* Remember the Slave data */
5492a0f0	372	smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
1da177e4	373	cpuid, timeout * 100);
1da177e4 LT	374	return 0;
	375	}
	376
ef017beb	377	void __init smp_prepare_boot_cpu(void)
1da177e4	378	{
ef017beb	379	int bootstrap_processor = per_cpu(cpu_data, 0).cpuid;
1da177e4	380
1da177e4	381	/* Setup BSP mappings */
ef017beb	382	printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor);
1da177e4	383
9bc181d8 RR	384	set_cpu_online(bootstrap_processor, true);
9bc181d8 RR	385	set_cpu_present(bootstrap_processor, true);
1da177e4 LT	386	}
	387
	388
	389
	390	/*
	391	** inventory.c:do_inventory() hasn't yet been run and thus we
7022672e	392	** don't 'discover' the additional CPUs until later.
1da177e4 LT	393	*/
	394	void __init smp_prepare_cpus(unsigned int max_cpus)
	395	{
6ad6c424 TG	396	int cpu;
	397
	398	for_each_possible_cpu(cpu)
	399	spin_lock_init(&per_cpu(ipi_lock, cpu));
	400
9bc181d8	401	init_cpu_present(cpumask_of(0));
1da177e4 LT	402
	403	parisc_max_cpus = max_cpus;
	404	if (!max_cpus)
	405	printk(KERN_INFO "SMP mode deactivated.\n");
	406	}
	407
	408
	409	void smp_cpus_done(unsigned int cpu_max)
	410	{
	411	return;
	412	}
	413
	414
60ffef06	415	int __cpu_up(unsigned int cpu, struct task_struct *tidle)
1da177e4	416	{
5baf919d HD	417	if (cpu != 0 && cpu < parisc_max_cpus && smp_boot_one_cpu(cpu, tidle))
5baf919d HD	418	return -ENOSYS;
1da177e4 LT	419
	420	return cpu_online(cpu) ? 0 : -ENOSYS;
	421	}
	422
1da177e4	423	#ifdef CONFIG_PROC_FS
01f56832	424	int setup_profiling_timer(unsigned int multiplier)
1da177e4 LT	425	{
	426	return -EINVAL;
	427	}
	428	#endif