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/* Call a function on a specified set of CPUs (may include this one). */
 47extern void on_each_cpu_mask(const struct cpumask *mask,
 48			     void (*func)(void *), void *info, bool wait);
 49
 50/* Topology of the supervisor tile grid, and coordinates of boot processor */
 51extern HV_Topology smp_topology;
 52
 53/* Accessors for grid size */
 54#define smp_height		(smp_topology.height)
 55#define smp_width		(smp_topology.width)
 56
 57/* Convenience functions for converting cpu <-> coords. */
 58static inline int cpu_x(int cpu)
 59{
 60	return cpu % smp_width;
 61}
 62static inline int cpu_y(int cpu)
 63{
 64	return cpu / smp_width;
 65}
 66static inline int xy_to_cpu(int x, int y)
 67{
 68	return y * smp_width + x;
 69}
 70
 71/* Hypervisor message tags sent via the tile send_IPI*() routines. */
 72#define MSG_TAG_START_CPU		1
 73#define MSG_TAG_STOP_CPU		2
 74#define MSG_TAG_CALL_FUNCTION_MANY	3
 75#define MSG_TAG_CALL_FUNCTION_SINGLE	4
 76
 77/* Hook for the generic smp_call_function_many() routine. */
 78static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
 79{
 80	send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
 81}
 82
 83/* Hook for the generic smp_call_function_single() routine. */
 84static inline void arch_send_call_function_single_ipi(int cpu)
 85{
 86	send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
 87}
 88
 89/* Print out the boot string describing which cpus were disabled. */
 90void print_disabled_cpus(void);
 91
 92#else /* !CONFIG_SMP */
 93
 94#define on_each_cpu_mask(mask, func, info, wait)		\
 95  do { if (cpumask_test_cpu(0, (mask))) func(info); } while (0)
 96
 97#define smp_master_cpu		0
 98#define smp_height		1
 99#define smp_width		1
100#define cpu_x(cpu)		0
101#define cpu_y(cpu)		0
102#define xy_to_cpu(x, y)		0
103
104#endif /* !CONFIG_SMP */
105
106
107/* Which cpus may be used as the lotar in a page table entry. */
108extern struct cpumask cpu_lotar_map;
109#define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
110
111#if CHIP_HAS_CBOX_HOME_MAP()
112/* Which processors are used for hash-for-home mapping */
113extern struct cpumask hash_for_home_map;
114#endif
115
116/* Which cpus can have their cache flushed by hv_flush_remote(). */
117extern struct cpumask cpu_cacheable_map;
118#define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
119
120/* Convert an HV_LOTAR value into a cpu. */
121static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
122{
123	return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
124}
125
126/*
127 * Extension of <linux/cpumask.h> functionality when you just want
128 * to express a mask or suppression or inclusion region without
129 * being too concerned about exactly which cpus are valid in that region.
130 */
131int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
132
133#define cpulist_parse_crop(buf, dst) \
134			__cpulist_parse_crop((buf), (dst), NR_CPUS)
135static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
136					int nbits)
137{
138	return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
139}
140
141/* Initialize the IPI subsystem. */
142void ipi_init(void);
143
144/* Function for start-cpu message to cause us to jump to. */
145extern unsigned long start_cpu_function_addr;
146
147#endif /* _ASM_TILE_SMP_H */