[linux-block.git] / arch / ia64 / include / asm / smp.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * SMP Support
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 */
#ifndef _ASM_IA64_SMP_H
#define _ASM_IA64_SMP_H

#include <linux/init.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/irqreturn.h>

#include <asm/io.h>
#include <asm/param.h>
#include <asm/processor.h>
#include <asm/ptrace.h>

static inline unsigned int
ia64_get_lid (void)
{
	union {
		struct {
			unsigned long reserved : 16;
			unsigned long eid : 8;
			unsigned long id : 8;
			unsigned long ignored : 32;
		} f;
		unsigned long bits;
	} lid;

	lid.bits = ia64_getreg(_IA64_REG_CR_LID);
	return lid.f.id << 8 | lid.f.eid;
}

#define hard_smp_processor_id()		ia64_get_lid()

#ifdef CONFIG_SMP

#define XTP_OFFSET		0x1e0008

#define SMP_IRQ_REDIRECTION	(1 << 0)
#define SMP_IPI_REDIRECTION	(1 << 1)

#define raw_smp_processor_id() (current_thread_info()->cpu)

extern struct smp_boot_data {
	int cpu_count;
	int cpu_phys_id[NR_CPUS];
} smp_boot_data __initdata;

extern char no_int_routing;

extern cpumask_t cpu_core_map[NR_CPUS];
DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
extern int smp_num_siblings;
extern void __iomem *ipi_base_addr;
extern unsigned char smp_int_redirect;

extern volatile int ia64_cpu_to_sapicid[];
#define cpu_physical_id(i)	ia64_cpu_to_sapicid[i]

extern unsigned long ap_wakeup_vector;

/*
 * Function to map hard smp processor id to logical id.  Slow, so don't use this in
 * performance-critical code.
 */
static inline int
cpu_logical_id (int cpuid)
{
	int i;

	for (i = 0; i < NR_CPUS; ++i)
		if (cpu_physical_id(i) == cpuid)
			break;
	return i;
}

/*
 * XTP control functions:
 *	min_xtp   : route all interrupts to this CPU
 *	normal_xtp: nominal XTP value
 *	max_xtp   : never deliver interrupts to this CPU.
 */

static inline void
min_xtp (void)
{
	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
		writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
}

static inline void
normal_xtp (void)
{
	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
		writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
}

static inline void
max_xtp (void)
{
	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
		writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
}

/* Upping and downing of CPUs */
extern int __cpu_disable (void);
extern void __cpu_die (unsigned int cpu);
extern void cpu_die (void) __attribute__ ((noreturn));
extern void __init smp_build_cpu_map(void);

extern void __init init_smp_config (void);
extern void smp_do_timer (struct pt_regs *regs);

extern irqreturn_t handle_IPI(int irq, void *dev_id);
extern void smp_send_reschedule (int cpu);
extern void identify_siblings (struct cpuinfo_ia64 *);
extern int is_multithreading_enabled(void);

extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);

#else /* CONFIG_SMP */

#define cpu_logical_id(i)		0
#define cpu_physical_id(i)		ia64_get_lid()

#endif /* CONFIG_SMP */
#endif /* _ASM_IA64_SMP_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* SMP Support
	4	*
	5	* Copyright (C) 1999 VA Linux Systems
	6	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	7	* (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
	8	* David Mosberger-Tang <davidm@hpl.hp.com>
	9	* Bjorn Helgaas <bjorn.helgaas@hp.com>
	10	*/
	11	#ifndef _ASM_IA64_SMP_H
	12	#define _ASM_IA64_SMP_H
	13
1da177e4 LT	14	#include <linux/init.h>
	15	#include <linux/threads.h>
	16	#include <linux/kernel.h>
	17	#include <linux/cpumask.h>
1977f032	18	#include <linux/bitops.h>
444933c6	19	#include <linux/irqreturn.h>
1da177e4	20
1da177e4 LT	21	#include <asm/io.h>
	22	#include <asm/param.h>
	23	#include <asm/processor.h>
	24	#include <asm/ptrace.h>
	25
	26	static inline unsigned int
	27	ia64_get_lid (void)
	28	{
	29	union {
	30	struct {
	31	unsigned long reserved : 16;
	32	unsigned long eid : 8;
	33	unsigned long id : 8;
	34	unsigned long ignored : 32;
	35	} f;
	36	unsigned long bits;
	37	} lid;
	38
	39	lid.bits = ia64_getreg(_IA64_REG_CR_LID);
	40	return lid.f.id << 8 \| lid.f.eid;
	41	}
	42
818563dc FLVC	43	#define hard_smp_processor_id() ia64_get_lid()
818563dc FLVC	44
1da177e4 LT	45	#ifdef CONFIG_SMP
	46
	47	#define XTP_OFFSET 0x1e0008
	48
	49	#define SMP_IRQ_REDIRECTION (1 << 0)
	50	#define SMP_IPI_REDIRECTION (1 << 1)
	51
39c715b7	52	#define raw_smp_processor_id() (current_thread_info()->cpu)
1da177e4 LT	53
	54	extern struct smp_boot_data {
	55	int cpu_count;
	56	int cpu_phys_id[NR_CPUS];
	57	} smp_boot_data __initdata;
	58
5b5e76e9	59	extern char no_int_routing;
1da177e4	60
e927ecb0	61	extern cpumask_t cpu_core_map[NR_CPUS];
9b8de747	62	DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
e927ecb0	63	extern int smp_num_siblings;
1da177e4 LT	64	extern void __iomem *ipi_base_addr;
	65	extern unsigned char smp_int_redirect;
	66
	67	extern volatile int ia64_cpu_to_sapicid[];
	68	#define cpu_physical_id(i) ia64_cpu_to_sapicid[i]
	69
	70	extern unsigned long ap_wakeup_vector;
	71
	72	/*
	73	* Function to map hard smp processor id to logical id. Slow, so don't use this in
	74	* performance-critical code.
	75	*/
	76	static inline int
	77	cpu_logical_id (int cpuid)
	78	{
	79	int i;
	80
	81	for (i = 0; i < NR_CPUS; ++i)
	82	if (cpu_physical_id(i) == cpuid)
	83	break;
	84	return i;
	85	}
	86
	87	/*
	88	* XTP control functions:
	89	* min_xtp : route all interrupts to this CPU
	90	* normal_xtp: nominal XTP value
	91	* max_xtp : never deliver interrupts to this CPU.
	92	*/
	93
	94	static inline void
	95	min_xtp (void)
	96	{
	97	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
	98	writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
	99	}
	100
	101	static inline void
	102	normal_xtp (void)
	103	{
	104	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
	105	writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
	106	}
	107
	108	static inline void
	109	max_xtp (void)
	110	{
	111	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
	112	writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
	113	}
	114
1da177e4 LT	115	/* Upping and downing of CPUs */
	116	extern int __cpu_disable (void);
	117	extern void __cpu_die (unsigned int cpu);
	118	extern void cpu_die (void) __attribute__ ((noreturn));
1da177e4 LT	119	extern void __init smp_build_cpu_map(void);
	120
	121	extern void __init init_smp_config (void);
	122	extern void smp_do_timer (struct pt_regs *regs);
	123
444933c6	124	extern irqreturn_t handle_IPI(int irq, void *dev_id);
1da177e4	125	extern void smp_send_reschedule (int cpu);
e927ecb0	126	extern void identify_siblings (struct cpuinfo_ia64 *);
dd562c05	127	extern int is_multithreading_enabled(void);
1da177e4	128
f27b433e	129	extern void arch_send_call_function_single_ipi(int cpu);
40fe697a	130	extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
f27b433e	131
2f4dfe20	132	#else /* CONFIG_SMP */
1da177e4 LT	133
	134	#define cpu_logical_id(i) 0
	135	#define cpu_physical_id(i) ia64_get_lid()
	136
	137	#endif /* CONFIG_SMP */
	138	#endif /* _ASM_IA64_SMP_H */