1/*
  2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3 *
  4 *   This program is free software; you can redistribute it and/or
  5 *   modify it under the terms of the GNU General Public License
  6 *   as published by the Free Software Foundation, version 2.
  7 *
  8 *   This program is distributed in the hope that it will be useful, but
  9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11 *   NON INFRINGEMENT.  See the GNU General Public License for
 12 *   more details.
 13 */
 14
 15#ifndef _ASM_TILE_SMP_H
 16#define _ASM_TILE_SMP_H
 17
 18#ifdef CONFIG_SMP
 19
 20#include <asm/processor.h>
 21#include <linux/cpumask.h>
 22#include <linux/irqreturn.h>
 23#include <hv/hypervisor.h>
 24
 25/* Set up this tile to support receiving hypervisor messages */
 26void init_messaging(void);
 27
 28/* Set up this tile to support receiving device interrupts and IPIs. */
 29void init_per_tile_IRQs(void);
 30
 31/* Send a message to processors specified in mask */
 32void send_IPI_many(const struct cpumask *mask, int tag);
 33
 34/* Send a message to all but the sending processor */
 35void send_IPI_allbutself(int tag);
 36
 37/* Send a message to a specific processor */
 38void send_IPI_single(int dest, int tag);
 39
 40/* Process an IPI message */
 41void evaluate_message(int tag);
 42
 43/* Boot a secondary cpu */
 44void online_secondary(void);
 45
 46/* Topology of the supervisor tile grid, and coordinates of boot processor */
 47extern HV_Topology smp_topology;
 48
 49/* Accessors for grid size */
 50#define smp_height		(smp_topology.height)
 51#define smp_width		(smp_topology.width)
 52
 53/* Convenience functions for converting cpu <-> coords. */
 54static inline int cpu_x(int cpu)
 55{
 56	return cpu % smp_width;
 57}
 58static inline int cpu_y(int cpu)
 59{
 60	return cpu / smp_width;
 61}
 62static inline int xy_to_cpu(int x, int y)
 63{
 64	return y * smp_width + x;
 65}
 66
 67/* Hypervisor message tags sent via the tile send_IPI*() routines. */
 68#define MSG_TAG_START_CPU		1
 69#define MSG_TAG_STOP_CPU		2
 70#define MSG_TAG_CALL_FUNCTION_MANY	3
 71#define MSG_TAG_CALL_FUNCTION_SINGLE	4
 72#define MSG_TAG_IRQ_WORK		5
 73
 74/* Hook for the generic smp_call_function_many() routine. */
 75static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
 76{
 77	send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
 78}
 79
 80/* Hook for the generic smp_call_function_single() routine. */
 81static inline void arch_send_call_function_single_ipi(int cpu)
 82{
 83	send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
 84}
 85
 86/* Print out the boot string describing which cpus were disabled. */
 87void print_disabled_cpus(void);
 88
 89#else /* !CONFIG_SMP */
 90
 91#define smp_master_cpu		0
 92#define smp_height		1
 93#define smp_width		1
 94#define cpu_x(cpu)		0
 95#define cpu_y(cpu)		0
 96#define xy_to_cpu(x, y)		0
 97
 98#endif /* !CONFIG_SMP */
 99
100
101/* Which cpus may be used as the lotar in a page table entry. */
102extern struct cpumask cpu_lotar_map;
103#define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
104
105/* Which processors are used for hash-for-home mapping */
106extern struct cpumask hash_for_home_map;
107
108/* Which cpus can have their cache flushed by hv_flush_remote(). */
109extern struct cpumask cpu_cacheable_map;
110#define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
111
112/* Convert an HV_LOTAR value into a cpu. */
113static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
114{
115	return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
116}
117
118/*
119 * Extension of <linux/cpumask.h> functionality when you just want
120 * to express a mask or suppression or inclusion region without
121 * being too concerned about exactly which cpus are valid in that region.
122 */
123int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
124
125#define cpulist_parse_crop(buf, dst) \
126			__cpulist_parse_crop((buf), (dst), NR_CPUS)
127static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
128					int nbits)
129{
130	return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
131}
132
133/* Initialize the IPI subsystem. */
134void ipi_init(void);
135
136/* Function for start-cpu message to cause us to jump to. */
137extern unsigned long start_cpu_function_addr;
138
139#endif /* _ASM_TILE_SMP_H */