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 */ 148