LXR linux/arch/mips/netlogic/common/smp.c

   1/*
   2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3 * reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the NetLogic
   9 * license below:
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 *
  15 * 1. Redistributions of source code must retain the above copyright
  16 *    notice, this list of conditions and the following disclaimer.
  17 * 2. Redistributions in binary form must reproduce the above copyright
  18 *    notice, this list of conditions and the following disclaimer in
  19 *    the documentation and/or other materials provided with the
  20 *    distribution.
  21 *
  22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35#include <linux/kernel.h>
  36#include <linux/delay.h>
  37#include <linux/init.h>
  38#include <linux/smp.h>
  39#include <linux/irq.h>
  40
  41#include <asm/mmu_context.h>
  42
  43#include <asm/netlogic/interrupt.h>
  44#include <asm/netlogic/mips-extns.h>
  45#include <asm/netlogic/haldefs.h>
  46#include <asm/netlogic/common.h>
  47
  48#if defined(CONFIG_CPU_XLP)
  49#include <asm/netlogic/xlp-hal/iomap.h>
  50#include <asm/netlogic/xlp-hal/xlp.h>
  51#include <asm/netlogic/xlp-hal/pic.h>
  52#elif defined(CONFIG_CPU_XLR)
  53#include <asm/netlogic/xlr/iomap.h>
  54#include <asm/netlogic/xlr/pic.h>
  55#include <asm/netlogic/xlr/xlr.h>
  56#else
  57#error "Unknown CPU"
  58#endif
  59
  60void nlm_send_ipi_single(int logical_cpu, unsigned int action)
  61{
  62        int cpu, node;
  63        uint64_t picbase;
  64
  65        cpu = cpu_logical_map(logical_cpu);
  66        node = cpu / NLM_CPUS_PER_NODE;
  67        picbase = nlm_get_node(node)->picbase;
  68
  69        if (action & SMP_CALL_FUNCTION)
  70                nlm_pic_send_ipi(picbase, cpu, IRQ_IPI_SMP_FUNCTION, 0);
  71        if (action & SMP_RESCHEDULE_YOURSELF)
  72                nlm_pic_send_ipi(picbase, cpu, IRQ_IPI_SMP_RESCHEDULE, 0);
  73}
  74
  75void nlm_send_ipi_mask(const struct cpumask *mask, unsigned int action)
  76{
  77        int cpu;
  78
  79        for_each_cpu(cpu, mask) {
  80                nlm_send_ipi_single(cpu, action);
  81        }
  82}
  83
  84/* IRQ_IPI_SMP_FUNCTION Handler */
  85void nlm_smp_function_ipi_handler(unsigned int irq, struct irq_desc *desc)
  86{
  87        clear_c0_eimr(irq);
  88        ack_c0_eirr(irq);
  89        smp_call_function_interrupt();
  90        set_c0_eimr(irq);
  91}
  92
  93/* IRQ_IPI_SMP_RESCHEDULE  handler */
  94void nlm_smp_resched_ipi_handler(unsigned int irq, struct irq_desc *desc)
  95{
  96        clear_c0_eimr(irq);
  97        ack_c0_eirr(irq);
  98        scheduler_ipi();
  99        set_c0_eimr(irq);
 100}
 101
 102/*
 103 * Called before going into mips code, early cpu init
 104 */
 105void nlm_early_init_secondary(int cpu)
 106{
 107        change_c0_config(CONF_CM_CMASK, 0x3);
 108#ifdef CONFIG_CPU_XLP
 109        /* mmu init, once per core */
 110        if (cpu % NLM_THREADS_PER_CORE == 0)
 111                xlp_mmu_init();
 112#endif
 113        write_c0_ebase(nlm_current_node()->ebase);
 114}
 115
 116/*
 117 * Code to run on secondary just after probing the CPU
 118 */
 119static void __cpuinit nlm_init_secondary(void)
 120{
 121        int hwtid;
 122
 123        hwtid = hard_smp_processor_id();
 124        current_cpu_data.core = hwtid / NLM_THREADS_PER_CORE;
 125        nlm_percpu_init(hwtid);
 126        nlm_smp_irq_init(hwtid);
 127}
 128
 129void nlm_prepare_cpus(unsigned int max_cpus)
 130{
 131        /* declare we are SMT capable */
 132        smp_num_siblings = nlm_threads_per_core;
 133}
 134
 135void nlm_smp_finish(void)
 136{
 137        local_irq_enable();
 138}
 139
 140void nlm_cpus_done(void)
 141{
 142}
 143
 144/*
 145 * Boot all other cpus in the system, initialize them, and bring them into
 146 * the boot function
 147 */
 148int nlm_cpu_ready[NR_CPUS];
 149unsigned long nlm_next_gp;
 150unsigned long nlm_next_sp;
 151static cpumask_t phys_cpu_present_mask;
 152
 153void nlm_boot_secondary(int logical_cpu, struct task_struct *idle)
 154{
 155        int cpu, node;
 156
 157        cpu = cpu_logical_map(logical_cpu);
 158        node = cpu / NLM_CPUS_PER_NODE;
 159        nlm_next_sp = (unsigned long)__KSTK_TOS(idle);
 160        nlm_next_gp = (unsigned long)task_thread_info(idle);
 161
 162        /* barrier for sp/gp store above */
 163        __sync();
 164        nlm_pic_send_ipi(nlm_get_node(node)->picbase, cpu, 1, 1);  /* NMI */
 165}
 166
 167void __init nlm_smp_setup(void)
 168{
 169        unsigned int boot_cpu;
 170        int num_cpus, i, ncore;
 171        char buf[64];
 172
 173        boot_cpu = hard_smp_processor_id();
 174        cpumask_clear(&phys_cpu_present_mask);
 175
 176        cpumask_set_cpu(boot_cpu, &phys_cpu_present_mask);
 177        __cpu_number_map[boot_cpu] = 0;
 178        __cpu_logical_map[0] = boot_cpu;
 179        set_cpu_possible(0, true);
 180
 181        num_cpus = 1;
 182        for (i = 0; i < NR_CPUS; i++) {
 183                /*
 184                 * nlm_cpu_ready array is not set for the boot_cpu,
 185                 * it is only set for ASPs (see smpboot.S)
 186                 */
 187                if (nlm_cpu_ready[i]) {
 188                        cpumask_set_cpu(i, &phys_cpu_present_mask);
 189                        __cpu_number_map[i] = num_cpus;
 190                        __cpu_logical_map[num_cpus] = i;
 191                        set_cpu_possible(num_cpus, true);
 192                        ++num_cpus;
 193                }
 194        }
 195
 196        cpumask_scnprintf(buf, ARRAY_SIZE(buf), &phys_cpu_present_mask);
 197        pr_info("Physical CPU mask: %s\n", buf);
 198        cpumask_scnprintf(buf, ARRAY_SIZE(buf), cpu_possible_mask);
 199        pr_info("Possible CPU mask: %s\n", buf);
 200
 201        /* check with the cores we have worken up */
 202        for (ncore = 0, i = 0; i < NLM_NR_NODES; i++)
 203                ncore += hweight32(nlm_get_node(i)->coremask);
 204
 205        pr_info("Detected (%dc%dt) %d Slave CPU(s)\n", ncore,
 206                nlm_threads_per_core, num_cpus);
 207
 208        /* switch NMI handler to boot CPUs */
 209        nlm_set_nmi_handler(nlm_boot_secondary_cpus);
 210}
 211
 212static int nlm_parse_cpumask(cpumask_t *wakeup_mask)
 213{
 214        uint32_t core0_thr_mask, core_thr_mask;
 215        int threadmode, i, j;
 216
 217        core0_thr_mask = 0;
 218        for (i = 0; i < NLM_THREADS_PER_CORE; i++)
 219                if (cpumask_test_cpu(i, wakeup_mask))
 220                        core0_thr_mask |= (1 << i);
 221        switch (core0_thr_mask) {
 222        case 1:
 223                nlm_threads_per_core = 1;
 224                threadmode = 0;
 225                break;
 226        case 3:
 227                nlm_threads_per_core = 2;
 228                threadmode = 2;
 229                break;
 230        case 0xf:
 231                nlm_threads_per_core = 4;
 232                threadmode = 3;
 233                break;
 234        default:
 235                goto unsupp;
 236        }
 237
 238        /* Verify other cores CPU masks */
 239        for (i = 0; i < NR_CPUS; i += NLM_THREADS_PER_CORE) {
 240                core_thr_mask = 0;
 241                for (j = 0; j < NLM_THREADS_PER_CORE; j++)
 242                        if (cpumask_test_cpu(i + j, wakeup_mask))
 243                                core_thr_mask |= (1 << j);
 244                if (core_thr_mask != 0 && core_thr_mask != core0_thr_mask)
 245                                goto unsupp;
 246        }
 247        return threadmode;
 248
 249unsupp:
 250        panic("Unsupported CPU mask %lx\n",
 251                (unsigned long)cpumask_bits(wakeup_mask)[0]);
 252        return 0;
 253}
 254
 255int __cpuinit nlm_wakeup_secondary_cpus(void)
 256{
 257        unsigned long reset_vec;
 258        char *reset_data;
 259        int threadmode;
 260
 261        /* Update reset entry point with CPU init code */
 262        reset_vec = CKSEG1ADDR(RESET_VEC_PHYS);
 263        memcpy((void *)reset_vec, (void *)nlm_reset_entry,
 264                        (nlm_reset_entry_end - nlm_reset_entry));
 265
 266        /* verify the mask and setup core config variables */
 267        threadmode = nlm_parse_cpumask(&nlm_cpumask);
 268
 269        /* Setup CPU init parameters */
 270        reset_data = (char *)CKSEG1ADDR(RESET_DATA_PHYS);
 271        *(int *)(reset_data + BOOT_THREAD_MODE) = threadmode;
 272
 273#ifdef CONFIG_CPU_XLP
 274        xlp_wakeup_secondary_cpus();
 275#else
 276        xlr_wakeup_secondary_cpus();
 277#endif
 278        return 0;
 279}
 280
 281struct plat_smp_ops nlm_smp_ops = {
 282        .send_ipi_single        = nlm_send_ipi_single,
 283        .send_ipi_mask          = nlm_send_ipi_mask,
 284        .init_secondary         = nlm_init_secondary,
 285        .smp_finish             = nlm_smp_finish,
 286        .cpus_done              = nlm_cpus_done,
 287        .boot_secondary         = nlm_boot_secondary,
 288        .smp_setup              = nlm_smp_setup,
 289        .prepare_cpus           = nlm_prepare_cpus,
 290};
 291