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 */ 140