+++ /dev/null
-/*
- * linux/arch/m32r/kernel/smpboot.c
- * orig : i386 2.4.10
- *
- * M32R SMP booting functions
- *
- * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
- *
- * Taken from i386 version.
- * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
- * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
- *
- * Much of the core SMP work is based on previous work by Thomas Radke, to
- * whom a great many thanks are extended.
- *
- * Thanks to Intel for making available several different Pentium,
- * Pentium Pro and Pentium-II/Xeon MP machines.
- * Original development of Linux SMP code supported by Caldera.
- *
- * This code is released under the GNU General Public License version 2 or
- * later.
- *
- * Fixes
- * Felix Koop : NR_CPUS used properly
- * Jose Renau : Handle single CPU case.
- * Alan Cox : By repeated request
- * 8) - Total BogoMIP report.
- * Greg Wright : Fix for kernel stacks panic.
- * Erich Boleyn : MP v1.4 and additional changes.
- * Matthias Sattler : Changes for 2.1 kernel map.
- * Michel Lespinasse : Changes for 2.1 kernel map.
- * Michael Chastain : Change trampoline.S to gnu as.
- * Alan Cox : Dumb bug: 'B' step PPro's are fine
- * Ingo Molnar : Added APIC timers, based on code
- * from Jose Renau
- * Ingo Molnar : various cleanups and rewrites
- * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
- * Maciej W. Rozycki : Bits for genuine 82489DX APICs
- * Martin J. Bligh : Added support for multi-quad systems
- */
-
-#include <linux/module.h>
-#include <linux/cpu.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/sched/task.h>
-#include <linux/err.h>
-#include <linux/irq.h>
-#include <linux/bootmem.h>
-#include <linux/delay.h>
-
-#include <asm/io.h>
-#include <asm/pgalloc.h>
-#include <asm/tlbflush.h>
-
-#define DEBUG_SMP
-#ifdef DEBUG_SMP
-#define Dprintk(x...) printk(x)
-#else
-#define Dprintk(x...)
-#endif
-
-extern cpumask_t cpu_initialized;
-
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-/* Data structures and variables */
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-
-/* Processor that is doing the boot up */
-static unsigned int bsp_phys_id = -1;
-
-/* Bitmask of physically existing CPUs */
-physid_mask_t phys_cpu_present_map;
-
-cpumask_t cpu_bootout_map;
-cpumask_t cpu_bootin_map;
-static cpumask_t cpu_callin_map;
-cpumask_t cpu_callout_map;
-EXPORT_SYMBOL(cpu_callout_map);
-
-/* Per CPU bogomips and other parameters */
-struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
-
-static int cpucount;
-static cpumask_t smp_commenced_mask;
-
-extern struct {
- void * spi;
- unsigned short ss;
-} stack_start;
-
-/* which physical physical ID maps to which logical CPU number */
-static volatile int physid_2_cpu[NR_CPUS];
-#define physid_to_cpu(physid) physid_2_cpu[physid]
-
-/* which logical CPU number maps to which physical ID */
-volatile int cpu_2_physid[NR_CPUS];
-
-DEFINE_PER_CPU(int, prof_multiplier) = 1;
-DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
-DEFINE_PER_CPU(int, prof_counter) = 1;
-
-spinlock_t ipi_lock[NR_IPIS];
-
-static unsigned int calibration_result;
-
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-/* Function Prototypes */
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-
-static void init_ipi_lock(void);
-static void do_boot_cpu(int);
-
-int start_secondary(void *);
-static void smp_callin(void);
-static void smp_online(void);
-
-static void show_mp_info(int);
-static void smp_store_cpu_info(int);
-static void show_cpu_info(int);
-int setup_profiling_timer(unsigned int);
-static void init_cpu_to_physid(void);
-static void map_cpu_to_physid(int, int);
-static void unmap_cpu_to_physid(int, int);
-
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-/* Boot up APs Routines : BSP */
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-void smp_prepare_boot_cpu(void)
-{
- bsp_phys_id = hard_smp_processor_id();
- physid_set(bsp_phys_id, phys_cpu_present_map);
- set_cpu_online(0, true); /* BSP's cpu_id == 0 */
- cpumask_set_cpu(0, &cpu_callout_map);
- cpumask_set_cpu(0, &cpu_callin_map);
-
- /*
- * Initialize the logical to physical CPU number mapping
- */
- init_cpu_to_physid();
- map_cpu_to_physid(0, bsp_phys_id);
- current_thread_info()->cpu = 0;
-}
-
-/*==========================================================================*
- * Name: smp_prepare_cpus (old smp_boot_cpus)
- *
- * Description: This routine boot up APs.
- *
- * Born on Date: 2002.02.05
- *
- * Arguments: NONE
- *
- * Returns: void (cannot fail)
- *
- * Modification log:
- * Date Who Description
- * ---------- --- --------------------------------------------------------
- * 2003-06-24 hy modify for linux-2.5.69
- *
- *==========================================================================*/
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
- int phys_id;
- unsigned long nr_cpu;
-
- nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
- if (nr_cpu > NR_CPUS) {
- printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
- nr_cpu, NR_CPUS);
- goto smp_done;
- }
- for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
- physid_set(phys_id, phys_cpu_present_map);
-#ifndef CONFIG_HOTPLUG_CPU
- init_cpu_present(cpu_possible_mask);
-#endif
-
- show_mp_info(nr_cpu);
-
- init_ipi_lock();
-
- /*
- * Setup boot CPU information
- */
- smp_store_cpu_info(0); /* Final full version of the data */
-
- /*
- * If SMP should be disabled, then really disable it!
- */
- if (!max_cpus) {
- printk(KERN_INFO "SMP mode deactivated by commandline.\n");
- goto smp_done;
- }
-
- /*
- * Now scan the CPU present map and fire up the other CPUs.
- */
- Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
-
- for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
- /*
- * Don't even attempt to start the boot CPU!
- */
- if (phys_id == bsp_phys_id)
- continue;
-
- if (!physid_isset(phys_id, phys_cpu_present_map))
- continue;
-
- if (max_cpus <= cpucount + 1)
- continue;
-
- do_boot_cpu(phys_id);
-
- /*
- * Make sure we unmap all failed CPUs
- */
- if (physid_to_cpu(phys_id) == -1) {
- physid_clear(phys_id, phys_cpu_present_map);
- printk("phys CPU#%d not responding - " \
- "cannot use it.\n", phys_id);
- }
- }
-
-smp_done:
- Dprintk("Boot done.\n");
-}
-
-/*
- * init_ipi_lock : Initialize IPI locks.
- */
-static void __init init_ipi_lock(void)
-{
- int ipi;
-
- for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
- spin_lock_init(&ipi_lock[ipi]);
-}
-
-/*==========================================================================*
- * Name: do_boot_cpu
- *
- * Description: This routine boot up one AP.
- *
- * Born on Date: 2002.02.05
- *
- * Arguments: phys_id - Target CPU physical ID
- *
- * Returns: void (cannot fail)
- *
- * Modification log:
- * Date Who Description
- * ---------- --- --------------------------------------------------------
- * 2003-06-24 hy modify for linux-2.5.69
- *
- *==========================================================================*/
-static void __init do_boot_cpu(int phys_id)
-{
- struct task_struct *idle;
- unsigned long send_status, boot_status;
- int timeout, cpu_id;
-
- cpu_id = ++cpucount;
-
- /*
- * We can't use kernel_thread since we must avoid to
- * reschedule the child.
- */
- idle = fork_idle(cpu_id);
- if (IS_ERR(idle))
- panic("failed fork for CPU#%d.", cpu_id);
-
- idle->thread.lr = (unsigned long)start_secondary;
-
- map_cpu_to_physid(cpu_id, phys_id);
-
- /* So we see what's up */
- printk("Booting processor %d/%d\n", phys_id, cpu_id);
- stack_start.spi = (void *)idle->thread.sp;
- task_thread_info(idle)->cpu = cpu_id;
-
- /*
- * Send Startup IPI
- * 1.IPI received by CPU#(phys_id).
- * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
- * 3.CPU#(phys_id) enter start_secondary()
- */
- send_status = 0;
- boot_status = 0;
-
- cpumask_set_cpu(phys_id, &cpu_bootout_map);
-
- /* Send Startup IPI */
- send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
-
- Dprintk("Waiting for send to finish...\n");
- timeout = 0;
-
- /* Wait 100[ms] */
- do {
- Dprintk("+");
- udelay(1000);
- send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
- } while (send_status && (timeout++ < 100));
-
- Dprintk("After Startup.\n");
-
- if (!send_status) {
- /*
- * allow APs to start initializing.
- */
- Dprintk("Before Callout %d.\n", cpu_id);
- cpumask_set_cpu(cpu_id, &cpu_callout_map);
- Dprintk("After Callout %d.\n", cpu_id);
-
- /*
- * Wait 5s total for a response
- */
- for (timeout = 0; timeout < 5000; timeout++) {
- if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
- break; /* It has booted */
- udelay(1000);
- }
-
- if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
- /* number CPUs logically, starting from 1 (BSP is 0) */
- Dprintk("OK.\n");
- } else {
- boot_status = 1;
- printk("Not responding.\n");
- }
- } else
- printk("IPI never delivered???\n");
-
- if (send_status || boot_status) {
- unmap_cpu_to_physid(cpu_id, phys_id);
- cpumask_clear_cpu(cpu_id, &cpu_callout_map);
- cpumask_clear_cpu(cpu_id, &cpu_callin_map);
- cpumask_clear_cpu(cpu_id, &cpu_initialized);
- cpucount--;
- }
-}
-
-int __cpu_up(unsigned int cpu_id, struct task_struct *tidle)
-{
- int timeout;
-
- cpumask_set_cpu(cpu_id, &smp_commenced_mask);
-
- /*
- * Wait 5s total for a response
- */
- for (timeout = 0; timeout < 5000; timeout++) {
- if (cpu_online(cpu_id))
- break;
- udelay(1000);
- }
- if (!cpu_online(cpu_id))
- BUG();
-
- return 0;
-}
-
-void __init smp_cpus_done(unsigned int max_cpus)
-{
- int cpu_id, timeout;
- unsigned long bogosum = 0;
-
- for (timeout = 0; timeout < 5000; timeout++) {
- if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
- break;
- udelay(1000);
- }
- if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
- BUG();
-
- for_each_online_cpu(cpu_id)
- show_cpu_info(cpu_id);
-
- /*
- * Allow the user to impress friends.
- */
- Dprintk("Before bogomips.\n");
- if (cpucount) {
- for_each_cpu(cpu_id,cpu_online_mask)
- bogosum += cpu_data[cpu_id].loops_per_jiffy;
-
- printk(KERN_INFO "Total of %d processors activated " \
- "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
- bogosum / (500000 / HZ),
- (bogosum / (5000 / HZ)) % 100);
- Dprintk("Before bogocount - setting activated=1.\n");
- }
-}
-
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-/* Activate a secondary processor Routines */
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-
-/*==========================================================================*
- * Name: start_secondary
- *
- * Description: This routine activate a secondary processor.
- *
- * Born on Date: 2002.02.05
- *
- * Arguments: *unused - currently unused.
- *
- * Returns: void (cannot fail)
- *
- * Modification log:
- * Date Who Description
- * ---------- --- --------------------------------------------------------
- * 2003-06-24 hy modify for linux-2.5.69
- *
- *==========================================================================*/
-int __init start_secondary(void *unused)
-{
- cpu_init();
- preempt_disable();
- smp_callin();
- while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
- cpu_relax();
-
- smp_online();
-
- /*
- * low-memory mappings have been cleared, flush them from
- * the local TLBs too.
- */
- local_flush_tlb_all();
-
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
- return 0;
-}
-
-/*==========================================================================*
- * Name: smp_callin
- *
- * Description: This routine activate a secondary processor.
- *
- * Born on Date: 2002.02.05
- *
- * Arguments: NONE
- *
- * Returns: void (cannot fail)
- *
- * Modification log:
- * Date Who Description
- * ---------- --- --------------------------------------------------------
- * 2003-06-24 hy modify for linux-2.5.69
- *
- *==========================================================================*/
-static void __init smp_callin(void)
-{
- int phys_id = hard_smp_processor_id();
- int cpu_id = smp_processor_id();
- unsigned long timeout;
-
- if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
- printk("huh, phys CPU#%d, CPU#%d already present??\n",
- phys_id, cpu_id);
- BUG();
- }
- Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
-
- /* Waiting 2s total for startup (udelay is not yet working) */
- timeout = jiffies + (2 * HZ);
- while (time_before(jiffies, timeout)) {
- /* Has the boot CPU finished it's STARTUP sequence ? */
- if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
- break;
- cpu_relax();
- }
-
- if (!time_before(jiffies, timeout)) {
- printk("BUG: CPU#%d started up but did not get a callout!\n",
- cpu_id);
- BUG();
- }
-
- /* Allow the master to continue. */
- cpumask_set_cpu(cpu_id, &cpu_callin_map);
-}
-
-static void __init smp_online(void)
-{
- int cpu_id = smp_processor_id();
-
- notify_cpu_starting(cpu_id);
-
- local_irq_enable();
-
- /* Get our bogomips. */
- calibrate_delay();
-
- /* Save our processor parameters */
- smp_store_cpu_info(cpu_id);
-
- set_cpu_online(cpu_id, true);
-}
-
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-/* Boot up CPUs common Routines */
-/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
-static void __init show_mp_info(int nr_cpu)
-{
- int i;
- char cpu_model0[17], cpu_model1[17], cpu_ver[9];
-
- strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
- strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
- strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
-
- cpu_model0[16] = '\0';
- for (i = 15 ; i >= 0 ; i--) {
- if (cpu_model0[i] != ' ')
- break;
- cpu_model0[i] = '\0';
- }
- cpu_model1[16] = '\0';
- for (i = 15 ; i >= 0 ; i--) {
- if (cpu_model1[i] != ' ')
- break;
- cpu_model1[i] = '\0';
- }
- cpu_ver[8] = '\0';
- for (i = 7 ; i >= 0 ; i--) {
- if (cpu_ver[i] != ' ')
- break;
- cpu_ver[i] = '\0';
- }
-
- printk(KERN_INFO "M32R-mp information\n");
- printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu);
- printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0,
- cpu_model1, cpu_ver);
-}
-
-/*
- * The bootstrap kernel entry code has set these up. Save them for
- * a given CPU
- */
-static void __init smp_store_cpu_info(int cpu_id)
-{
- struct cpuinfo_m32r *ci = cpu_data + cpu_id;
-
- *ci = boot_cpu_data;
- ci->loops_per_jiffy = loops_per_jiffy;
-}
-
-static void __init show_cpu_info(int cpu_id)
-{
- struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
-
- printk("CPU#%d : ", cpu_id);
-
-#define PRINT_CLOCK(name, value) \
- printk(name " clock %d.%02dMHz", \
- ((value) / 1000000), ((value) % 1000000) / 10000)
-
- PRINT_CLOCK("CPU", (int)ci->cpu_clock);
- PRINT_CLOCK(", Bus", (int)ci->bus_clock);
- printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
-}
-
-/*
- * the frequency of the profiling timer can be changed
- * by writing a multiplier value into /proc/profile.
- */
-int setup_profiling_timer(unsigned int multiplier)
-{
- int i;
-
- /*
- * Sanity check. [at least 500 APIC cycles should be
- * between APIC interrupts as a rule of thumb, to avoid
- * irqs flooding us]
- */
- if ( (!multiplier) || (calibration_result / multiplier < 500))
- return -EINVAL;
-
- /*
- * Set the new multiplier for each CPU. CPUs don't start using the
- * new values until the next timer interrupt in which they do process
- * accounting. At that time they also adjust their APIC timers
- * accordingly.
- */
- for_each_possible_cpu(i)
- per_cpu(prof_multiplier, i) = multiplier;
-
- return 0;
-}
-
-/* Initialize all maps between cpu number and apicids */
-static void __init init_cpu_to_physid(void)
-{
- int i;
-
- for (i = 0 ; i < NR_CPUS ; i++) {
- cpu_2_physid[i] = -1;
- physid_2_cpu[i] = -1;
- }
-}
-
-/*
- * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
- * else physical apic ids
- */
-static void __init map_cpu_to_physid(int cpu_id, int phys_id)
-{
- physid_2_cpu[phys_id] = cpu_id;
- cpu_2_physid[cpu_id] = phys_id;
-}
-
-/*
- * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
- * else physical apic ids
- */
-static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
-{
- physid_2_cpu[phys_id] = -1;
- cpu_2_physid[cpu_id] = -1;
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff