Linux-2.6.33.2/arch/m32r/kernel/smpboot.c
/*
* 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/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 */
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
void smp_prepare_boot_cpu(void);
void smp_prepare_cpus(unsigned int);
static void init_ipi_lock(void);
static void do_boot_cpu(int);
int __cpu_up(unsigned int);
void smp_cpus_done(unsigned 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 __devinit smp_prepare_boot_cpu(void)
{
bsp_phys_id = hard_smp_processor_id();
physid_set(bsp_phys_id, phys_cpu_present_map);
cpu_set(0, cpu_online_map); /* BSP's cpu_id == 0 */
cpu_set(0, cpu_callout_map);
cpu_set(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_map);
#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;
cpu_set(phys_id, cpu_bootout_map);
/* Send Startup IPI */
send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
Dprintk("Waiting for send to finish...\n");
timeout = 0;
/* Wait 100[ms] */
do {
Dprintk("+");
udelay(1000);
send_status = !cpu_isset(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);
cpu_set(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 (cpu_isset(cpu_id, cpu_callin_map))
break; /* It has booted */
udelay(1000);
}
if (cpu_isset(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);
cpu_clear(cpu_id, cpu_callout_map);
cpu_clear(cpu_id, cpu_callin_map);
cpu_clear(cpu_id, cpu_initialized);
cpucount--;
}
}
int __cpuinit __cpu_up(unsigned int cpu_id)
{
int timeout;
cpu_set(cpu_id, smp_commenced_mask);
/*
* Wait 5s total for a response
*/
for (timeout = 0; timeout < 5000; timeout++) {
if (cpu_isset(cpu_id, cpu_online_map))
break;
udelay(1000);
}
if (!cpu_isset(cpu_id, cpu_online_map))
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 (cpus_equal(cpu_callin_map, cpu_online_map))
break;
udelay(1000);
}
if (!cpus_equal(cpu_callin_map, cpu_online_map))
BUG();
for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
show_cpu_info(cpu_id);
/*
* Allow the user to impress friends.
*/
Dprintk("Before bogomips.\n");
if (cpucount) {
for_each_cpu_mask(cpu_id, cpu_online_map)
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 (!cpu_isset(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_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 (cpu_isset(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 (cpu_isset(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. */
cpu_set(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);
cpu_set(cpu_id, cpu_online_map);
}
/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
/* 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;
}