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x86: integrate do_boot_cpu

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This is a very large patch, because it depends on a lot
of auxiliary static functions. But they all have been modified
to the point that they're sufficiently close now. So they're just
merged in smpboot.c

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber de Oliveira Costa 2008-03-19 14:25:59 -03:00 committed by Ingo Molnar
parent c70dcb7430
commit cb3c8b9003
4 changed files with 594 additions and 1044 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

588
arch/x86/kernel/smpboot.c
View File

@ -4,14 +4,42 @@
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#include <linux/bootmem.h> #include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/nmi.h>
#include <asm/desc.h>
#include <asm/nmi.h> #include <asm/nmi.h>
#include <asm/irq.h> #include <asm/irq.h>
#include <asm/smp.h> #include <asm/smp.h>
#include <asm/cpu.h> #include <asm/cpu.h>
#include <asm/numa.h> #include <asm/numa.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mtrr.h>
#include <asm/nmi.h>
#include <linux/mc146818rtc.h>
#include <mach_apic.h> #include <mach_apic.h>
#include <mach_wakecpu.h>
#include <smpboot_hooks.h>
/* Store all idle threads, this can be reused instead of creating
* a new thread. Also avoids complicated thread destroy functionality
* for idle threads.
*/
#ifdef CONFIG_HOTPLUG_CPU
/*
* Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
* removed after init for !CONFIG_HOTPLUG_CPU.
*/
static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
#else
struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
#define get_idle_for_cpu(x) (idle_thread_array[(x)])
#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
#endif
/* Number of siblings per CPU package */ /* Number of siblings per CPU package */
int smp_num_siblings = 1; int smp_num_siblings = 1;
@ -41,6 +69,8 @@ EXPORT_PER_CPU_SYMBOL(cpu_core_map);
DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info); EXPORT_PER_CPU_SYMBOL(cpu_info);
static atomic_t init_deasserted;
/* ready for x86_64, no harm for x86, since it will overwrite after alloc */ /* ready for x86_64, no harm for x86, since it will overwrite after alloc */
unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE); unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE);
@ -110,6 +140,96 @@ void unmap_cpu_to_logical_apicid(int cpu)
#define map_cpu_to_logical_apicid() do {} while (0) #define map_cpu_to_logical_apicid() do {} while (0)
#endif #endif
/*
* Report back to the Boot Processor.
* Running on AP.
*/
void __cpuinit smp_callin(void)
{
int cpuid, phys_id;
unsigned long timeout;
/*
* If waken up by an INIT in an 82489DX configuration
* we may get here before an INIT-deassert IPI reaches
* our local APIC. We have to wait for the IPI or we'll
* lock up on an APIC access.
*/
wait_for_init_deassert(&init_deasserted);
/*
* (This works even if the APIC is not enabled.)
*/
phys_id = GET_APIC_ID(apic_read(APIC_ID));
cpuid = smp_processor_id();
if (cpu_isset(cpuid, cpu_callin_map)) {
panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__,
phys_id, cpuid);
}
Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
/*
* STARTUP IPIs are fragile beasts as they might sometimes
* trigger some glue motherboard logic. Complete APIC bus
* silence for 1 second, this overestimates the time the
* boot CPU is spending to send the up to 2 STARTUP IPIs
* by a factor of two. This should be enough.
*/
/*
* 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(cpuid, cpu_callout_map))
break;
cpu_relax();
}
if (!time_before(jiffies, timeout)) {
panic("%s: CPU%d started up but did not get a callout!\n",
__func__, cpuid);
}
/*
* the boot CPU has finished the init stage and is spinning
* on callin_map until we finish. We are free to set up this
* CPU, first the APIC. (this is probably redundant on most
* boards)
*/
Dprintk("CALLIN, before setup_local_APIC().\n");
smp_callin_clear_local_apic();
setup_local_APIC();
end_local_APIC_setup();
map_cpu_to_logical_apicid();
/*
* Get our bogomips.
*
* Need to enable IRQs because it can take longer and then
* the NMI watchdog might kill us.
*/
local_irq_enable();
calibrate_delay();
local_irq_disable();
Dprintk("Stack at about %p\n", &cpuid);
/*
* Save our processor parameters
*/
smp_store_cpu_info(cpuid);
/*
* Allow the master to continue.
*/
cpu_set(cpuid, cpu_callin_map);
}
static void __cpuinit smp_apply_quirks(struct cpuinfo_x86 *c) static void __cpuinit smp_apply_quirks(struct cpuinfo_x86 *c)
{ {
#ifdef CONFIG_X86_32 #ifdef CONFIG_X86_32
@ -327,6 +447,474 @@ void impress_friends(void)
Dprintk("Before bogocount - setting activated=1.\n"); Dprintk("Before bogocount - setting activated=1.\n");
} }
static inline void __inquire_remote_apic(int apicid)
{
unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
char *names[] = { "ID", "VERSION", "SPIV" };
int timeout;
u32 status;
printk(KERN_INFO "Inquiring remote APIC #%d...\n", apicid);
for (i = 0; i < ARRAY_SIZE(regs); i++) {
printk(KERN_INFO "... APIC #%d %s: ", apicid, names[i]);
/*
* Wait for idle.
*/
status = safe_apic_wait_icr_idle();
if (status)
printk(KERN_CONT
"a previous APIC delivery may have failed\n");
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
apic_write_around(APIC_ICR, APIC_DM_REMRD | regs[i]);
timeout = 0;
do {
udelay(100);
status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK;
} while (status == APIC_ICR_RR_INPROG && timeout++ < 1000);
switch (status) {
case APIC_ICR_RR_VALID:
status = apic_read(APIC_RRR);
printk(KERN_CONT "%08x\n", status);
break;
default:
printk(KERN_CONT "failed\n");
}
}
}
#ifdef WAKE_SECONDARY_VIA_NMI
/*
* Poke the other CPU in the eye via NMI to wake it up. Remember that the normal
* INIT, INIT, STARTUP sequence will reset the chip hard for us, and this
* won't ... remember to clear down the APIC, etc later.
*/
static int __devinit
wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip)
{
unsigned long send_status, accept_status = 0;
int maxlvt;
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(logical_apicid));
/* Boot on the stack */
/* Kick the second */
apic_write_around(APIC_ICR, APIC_DM_NMI | APIC_DEST_LOGICAL);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
/*
* Due to the Pentium erratum 3AP.
*/
maxlvt = lapic_get_maxlvt();
if (maxlvt > 3) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
}
accept_status = (apic_read(APIC_ESR) & 0xEF);
Dprintk("NMI sent.\n");
if (send_status)
printk(KERN_ERR "APIC never delivered???\n");
if (accept_status)
printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status);
return (send_status | accept_status);
}
#endif /* WAKE_SECONDARY_VIA_NMI */
extern void start_secondary(void *unused);
#ifdef WAKE_SECONDARY_VIA_INIT
static int __devinit
wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
{
unsigned long send_status, accept_status = 0;
int maxlvt, num_starts, j;
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid])) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
Dprintk("Asserting INIT.\n");
/*
* Turn INIT on target chip
*/
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/*
* Send IPI
*/
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_INT_ASSERT
| APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mdelay(10);
Dprintk("Deasserting INIT.\n");
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Send IPI */
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mb();
atomic_set(&init_deasserted, 1);
/*
* Should we send STARTUP IPIs ?
*
* Determine this based on the APIC version.
* If we don't have an integrated APIC, don't send the STARTUP IPIs.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid]))
num_starts = 2;
else
num_starts = 0;
/*
* Paravirt / VMI wants a startup IPI hook here to set up the
* target processor state.
*/
startup_ipi_hook(phys_apicid, (unsigned long) start_secondary,
#ifdef CONFIG_X86_64
(unsigned long)init_rsp);
#else
(unsigned long)stack_start.sp);
#endif
/*
* Run STARTUP IPI loop.
*/
Dprintk("#startup loops: %d.\n", num_starts);
maxlvt = lapic_get_maxlvt();
for (j = 1; j <= num_starts; j++) {
Dprintk("Sending STARTUP #%d.\n", j);
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
Dprintk("After apic_write.\n");
/*
* STARTUP IPI
*/
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Boot on the stack */
/* Kick the second */
apic_write_around(APIC_ICR, APIC_DM_STARTUP
| (start_eip >> 12));
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(300);
Dprintk("Startup point 1.\n");
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
/*
* Due to the Pentium erratum 3AP.
*/
if (maxlvt > 3) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
}
accept_status = (apic_read(APIC_ESR) & 0xEF);
if (send_status || accept_status)
break;
}
Dprintk("After Startup.\n");
if (send_status)
printk(KERN_ERR "APIC never delivered???\n");
if (accept_status)
printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status);
return (send_status | accept_status);
}
#endif /* WAKE_SECONDARY_VIA_INIT */
struct create_idle {
struct work_struct work;
struct task_struct *idle;
struct completion done;
int cpu;
};
static void __cpuinit do_fork_idle(struct work_struct *work)
{
struct create_idle *c_idle =
container_of(work, struct create_idle, work);
c_idle->idle = fork_idle(c_idle->cpu);
complete(&c_idle->done);
}
static int __cpuinit do_boot_cpu(int apicid, int cpu)
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
* (ie clustered apic addressing mode), this is a LOGICAL apic ID.
* Returns zero if CPU booted OK, else error code from wakeup_secondary_cpu.
*/
{
unsigned long boot_error = 0;
int timeout;
unsigned long start_ip;
unsigned short nmi_high = 0, nmi_low = 0;
struct create_idle c_idle = {
.cpu = cpu,
.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
};
INIT_WORK(&c_idle.work, do_fork_idle);
#ifdef CONFIG_X86_64
/* allocate memory for gdts of secondary cpus. Hotplug is considered */
if (!cpu_gdt_descr[cpu].address &&
!(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) {
printk(KERN_ERR "Failed to allocate GDT for CPU %d\n", cpu);
return -1;
}
/* Allocate node local memory for AP pdas */
if (cpu_pda(cpu) == &boot_cpu_pda[cpu]) {
struct x8664_pda *newpda, *pda;
int node = cpu_to_node(cpu);
pda = cpu_pda(cpu);
newpda = kmalloc_node(sizeof(struct x8664_pda), GFP_ATOMIC,
node);
if (newpda) {
memcpy(newpda, pda, sizeof(struct x8664_pda));
cpu_pda(cpu) = newpda;
} else
printk(KERN_ERR
"Could not allocate node local PDA for CPU %d on node %d\n",
cpu, node);
}
#endif
alternatives_smp_switch(1);
c_idle.idle = get_idle_for_cpu(cpu);
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
*/
if (c_idle.idle) {
c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *)
(THREAD_SIZE + task_stack_page(c_idle.idle))) - 1);
init_idle(c_idle.idle, cpu);
goto do_rest;
}
if (!keventd_up() || current_is_keventd())
c_idle.work.func(&c_idle.work);
else {
schedule_work(&c_idle.work);
wait_for_completion(&c_idle.done);
}
if (IS_ERR(c_idle.idle)) {
printk("failed fork for CPU %d\n", cpu);
return PTR_ERR(c_idle.idle);
}
set_idle_for_cpu(cpu, c_idle.idle);
do_rest:
#ifdef CONFIG_X86_32
per_cpu(current_task, cpu) = c_idle.idle;
init_gdt(cpu);
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
c_idle.idle->thread.ip = (unsigned long) start_secondary;
/* Stack for startup_32 can be just as for start_secondary onwards */
stack_start.sp = (void *) c_idle.idle->thread.sp;
irq_ctx_init(cpu);
#else
cpu_pda(cpu)->pcurrent = c_idle.idle;
init_rsp = c_idle.idle->thread.sp;
load_sp0(&per_cpu(init_tss, cpu), &c_idle.idle->thread);
initial_code = (unsigned long)start_secondary;
clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
#endif
/* start_ip had better be page-aligned! */
start_ip = setup_trampoline();
/* So we see what's up */
printk(KERN_INFO "Booting processor %d/%d ip %lx\n",
cpu, apicid, start_ip);
/*
* This grunge runs the startup process for
* the targeted processor.
*/
atomic_set(&init_deasserted, 0);
Dprintk("Setting warm reset code and vector.\n");
store_NMI_vector(&nmi_high, &nmi_low);
smpboot_setup_warm_reset_vector(start_ip);
/*
* Be paranoid about clearing APIC errors.
*/
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
/*
* Starting actual IPI sequence...
*/
boot_error = wakeup_secondary_cpu(apicid, start_ip);
if (!boot_error) {
/*
* allow APs to start initializing.
*/
Dprintk("Before Callout %d.\n", cpu);
cpu_set(cpu, cpu_callout_map);
Dprintk("After Callout %d.\n", cpu);
/*
* Wait 5s total for a response
*/
for (timeout = 0; timeout < 50000; timeout++) {
if (cpu_isset(cpu, cpu_callin_map))
break; /* It has booted */
udelay(100);
}
if (cpu_isset(cpu, cpu_callin_map)) {
/* number CPUs logically, starting from 1 (BSP is 0) */
Dprintk("OK.\n");
printk(KERN_INFO "CPU%d: ", cpu);
print_cpu_info(&cpu_data(cpu));
Dprintk("CPU has booted.\n");
} else {
boot_error = 1;
if (*((volatile unsigned char *)trampoline_base)
== 0xA5)
/* trampoline started but...? */
printk(KERN_ERR "Stuck ??\n");
else
/* trampoline code not run */
printk(KERN_ERR "Not responding.\n");
inquire_remote_apic(apicid);
}
}
if (boot_error) {
/* Try to put things back the way they were before ... */
unmap_cpu_to_logical_apicid(cpu);
#ifdef CONFIG_X86_64
clear_node_cpumask(cpu); /* was set by numa_add_cpu */
#endif
cpu_clear(cpu, cpu_callout_map); /* was set by do_boot_cpu() */
cpu_clear(cpu, cpu_initialized); /* was set by cpu_init() */
cpu_clear(cpu, cpu_possible_map);
cpu_clear(cpu, cpu_present_map);
per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
}
/* mark "stuck" area as not stuck */
*((volatile unsigned long *)trampoline_base) = 0;
return boot_error;
}
int __cpuinit native_cpu_up(unsigned int cpu)
{
int apicid = cpu_present_to_apicid(cpu);
unsigned long flags;
int err;
WARN_ON(irqs_disabled());
Dprintk("++++++++++++++++++++=_---CPU UP %u\n", cpu);
if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
!physid_isset(apicid, phys_cpu_present_map)) {
printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
return -EINVAL;
}
/*
* Already booted CPU?
*/
if (cpu_isset(cpu, cpu_callin_map)) {
Dprintk("do_boot_cpu %d Already started\n", cpu);
return -ENOSYS;
}
/*
* Save current MTRR state in case it was changed since early boot
* (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
*/
mtrr_save_state();
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
#ifdef CONFIG_X86_32
/* init low mem mapping */
clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
flush_tlb_all();
#endif
err = do_boot_cpu(apicid, cpu);
if (err < 0) {
Dprintk("do_boot_cpu failed %d\n", err);
return err;
}
/*
* Check TSC synchronization with the AP (keep irqs disabled
* while doing so):
*/
local_irq_save(flags);
check_tsc_sync_source(cpu);
local_irq_restore(flags);
while (!cpu_isset(cpu, cpu_online_map)) {
cpu_relax();
touch_nmi_watchdog();
}
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
void remove_siblinginfo(int cpu) void remove_siblinginfo(int cpu)
{ {

532
arch/x86/kernel/smpboot_32.c
View File

@ -80,114 +80,12 @@ extern void unmap_cpu_to_logical_apicid(int cpu);
/* State of each CPU. */ /* State of each CPU. */
DEFINE_PER_CPU(int, cpu_state) = { 0 }; DEFINE_PER_CPU(int, cpu_state) = { 0 };
/* Store all idle threads, this can be reused instead of creating extern void smp_callin(void);
* a new thread. Also avoids complicated thread destroy functionality
* for idle threads.
*/
#ifdef CONFIG_HOTPLUG_CPU
/*
* Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
* removed after init for !CONFIG_HOTPLUG_CPU.
*/
static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
#else
struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
#define get_idle_for_cpu(x) (idle_thread_array[(x)])
#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
#endif
static atomic_t init_deasserted;
static void __cpuinit smp_callin(void)
{
int cpuid, phys_id;
unsigned long timeout;
/*
* If waken up by an INIT in an 82489DX configuration
* we may get here before an INIT-deassert IPI reaches
* our local APIC. We have to wait for the IPI or we'll
* lock up on an APIC access.
*/
wait_for_init_deassert(&init_deasserted);
/*
* (This works even if the APIC is not enabled.)
*/
phys_id = GET_APIC_ID(apic_read(APIC_ID));
cpuid = smp_processor_id();
if (cpu_isset(cpuid, cpu_callin_map)) {
printk("huh, phys CPU#%d, CPU#%d already present??\n",
phys_id, cpuid);
BUG();
}
Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
/*
* STARTUP IPIs are fragile beasts as they might sometimes
* trigger some glue motherboard logic. Complete APIC bus
* silence for 1 second, this overestimates the time the
* boot CPU is spending to send the up to 2 STARTUP IPIs
* by a factor of two. This should be enough.
*/
/*
* 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(cpuid, cpu_callout_map))
break;
cpu_relax();
}
if (!time_before(jiffies, timeout)) {
printk("BUG: CPU%d started up but did not get a callout!\n",
cpuid);
BUG();
}
/*
* the boot CPU has finished the init stage and is spinning
* on callin_map until we finish. We are free to set up this
* CPU, first the APIC. (this is probably redundant on most
* boards)
*/
Dprintk("CALLIN, before setup_local_APIC().\n");
smp_callin_clear_local_apic();
setup_local_APIC();
end_local_APIC_setup();
map_cpu_to_logical_apicid();
/*
* Get our bogomips.
*/
local_irq_enable();
calibrate_delay();
local_irq_disable();
Dprintk("Stack at about %p\n",&cpuid);
/*
* Save our processor parameters
*/
smp_store_cpu_info(cpuid);
/*
* Allow the master to continue.
*/
cpu_set(cpuid, cpu_callin_map);
}
/* /*
* Activate a secondary processor. * Activate a secondary processor.
*/ */
static void __cpuinit start_secondary(void *unused) void __cpuinit start_secondary(void *unused)
{ {
/* /*
* Don't put *anything* before cpu_init(), SMP booting is too * Don't put *anything* before cpu_init(), SMP booting is too
@ -257,373 +155,6 @@ void __devinit initialize_secondary(void)
:"m" (current->thread.sp),"m" (current->thread.ip)); :"m" (current->thread.sp),"m" (current->thread.ip));
} }
static inline void __inquire_remote_apic(int apicid)
{
unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
char *names[] = { "ID", "VERSION", "SPIV" };
int timeout;
u32 status;
printk(KERN_INFO "Inquiring remote APIC #%d...\n", apicid);
for (i = 0; i < ARRAY_SIZE(regs); i++) {
printk(KERN_INFO "... APIC #%d %s: ", apicid, names[i]);
/*
* Wait for idle.
*/
status = safe_apic_wait_icr_idle();
if (status)
printk(KERN_CONT
"a previous APIC delivery may have failed\n");
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
apic_write_around(APIC_ICR, APIC_DM_REMRD | regs[i]);
timeout = 0;
do {
udelay(100);
status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK;
} while (status == APIC_ICR_RR_INPROG && timeout++ < 1000);
switch (status) {
case APIC_ICR_RR_VALID:
status = apic_read(APIC_RRR);
printk(KERN_CONT "%08x\n", status);
break;
default:
printk(KERN_CONT "failed\n");
}
}
}
#ifdef WAKE_SECONDARY_VIA_NMI
/*
* Poke the other CPU in the eye via NMI to wake it up. Remember that the normal
* INIT, INIT, STARTUP sequence will reset the chip hard for us, and this
* won't ... remember to clear down the APIC, etc later.
*/
static int __devinit
wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip)
{
unsigned long send_status, accept_status = 0;
int maxlvt;
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(logical_apicid));
/* Boot on the stack */
/* Kick the second */
apic_write_around(APIC_ICR, APIC_DM_NMI | APIC_DEST_LOGICAL);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
/*
* Due to the Pentium erratum 3AP.
*/
maxlvt = lapic_get_maxlvt();
if (maxlvt > 3) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
}
accept_status = (apic_read(APIC_ESR) & 0xEF);
Dprintk("NMI sent.\n");
if (send_status)
printk("APIC never delivered???\n");
if (accept_status)
printk("APIC delivery error (%lx).\n", accept_status);
return (send_status | accept_status);
}
#endif /* WAKE_SECONDARY_VIA_NMI */
#ifdef WAKE_SECONDARY_VIA_INIT
static int __devinit
wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
{
unsigned long send_status, accept_status = 0;
int maxlvt, num_starts, j;
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid])) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
Dprintk("Asserting INIT.\n");
/*
* Turn INIT on target chip
*/
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/*
* Send IPI
*/
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_INT_ASSERT
| APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mdelay(10);
Dprintk("Deasserting INIT.\n");
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Send IPI */
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mb();
atomic_set(&init_deasserted, 1);
/*
* Should we send STARTUP IPIs ?
*
* Determine this based on the APIC version.
* If we don't have an integrated APIC, don't send the STARTUP IPIs.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid]))
num_starts = 2;
else
num_starts = 0;
/*
* Paravirt / VMI wants a startup IPI hook here to set up the
* target processor state.
*/
startup_ipi_hook(phys_apicid, (unsigned long) start_secondary,
(unsigned long) stack_start.sp);
/*
* Run STARTUP IPI loop.
*/
Dprintk("#startup loops: %d.\n", num_starts);
maxlvt = lapic_get_maxlvt();
for (j = 1; j <= num_starts; j++) {
Dprintk("Sending STARTUP #%d.\n",j);
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
Dprintk("After apic_write.\n");
/*
* STARTUP IPI
*/
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Boot on the stack */
/* Kick the second */
apic_write_around(APIC_ICR, APIC_DM_STARTUP
| (start_eip >> 12));
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(300);
Dprintk("Startup point 1.\n");
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
/*
* Due to the Pentium erratum 3AP.
*/
if (maxlvt > 3) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
}
accept_status = (apic_read(APIC_ESR) & 0xEF);
if (send_status || accept_status)
break;
}
Dprintk("After Startup.\n");
if (send_status)
printk("APIC never delivered???\n");
if (accept_status)
printk("APIC delivery error (%lx).\n", accept_status);
return (send_status | accept_status);
}
#endif /* WAKE_SECONDARY_VIA_INIT */
extern cpumask_t cpu_initialized;
struct create_idle {
struct work_struct work;
struct task_struct *idle;
struct completion done;
int cpu;
};
static void __cpuinit do_fork_idle(struct work_struct *work)
{
struct create_idle *c_idle =
container_of(work, struct create_idle, work);
c_idle->idle = fork_idle(c_idle->cpu);
complete(&c_idle->done);
}
static int __cpuinit do_boot_cpu(int apicid, int cpu)
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
* (ie clustered apic addressing mode), this is a LOGICAL apic ID.
* Returns zero if CPU booted OK, else error code from wakeup_secondary_cpu.
*/
{
unsigned long boot_error = 0;
int timeout;
unsigned long start_eip;
unsigned short nmi_high = 0, nmi_low = 0;
struct create_idle c_idle = {
.cpu = cpu,
.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
};
INIT_WORK(&c_idle.work, do_fork_idle);
alternatives_smp_switch(1);
c_idle.idle = get_idle_for_cpu(cpu);
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
*/
if (c_idle.idle) {
c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *)
(THREAD_SIZE + task_stack_page(c_idle.idle))) - 1);
init_idle(c_idle.idle, cpu);
goto do_rest;
}
if (!keventd_up() || current_is_keventd())
c_idle.work.func(&c_idle.work);
else {
schedule_work(&c_idle.work);
wait_for_completion(&c_idle.done);
}
if (IS_ERR(c_idle.idle)) {
printk(KERN_ERR "failed fork for CPU %d\n", cpu);
return PTR_ERR(c_idle.idle);
}
set_idle_for_cpu(cpu, c_idle.idle);
do_rest:
per_cpu(current_task, cpu) = c_idle.idle;
init_gdt(cpu);
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
c_idle.idle->thread.ip = (unsigned long) start_secondary;
/* start_eip had better be page-aligned! */
start_eip = setup_trampoline();
/* So we see what's up */
printk("Booting processor %d/%d ip %lx\n", cpu, apicid, start_eip);
/* Stack for startup_32 can be just as for start_secondary onwards */
stack_start.sp = (void *) c_idle.idle->thread.sp;
irq_ctx_init(cpu);
/*
* This grunge runs the startup process for
* the targeted processor.
*/
atomic_set(&init_deasserted, 0);
Dprintk("Setting warm reset code and vector.\n");
store_NMI_vector(&nmi_high, &nmi_low);
smpboot_setup_warm_reset_vector(start_eip);
/*
* Be paranoid about clearing APIC errors.
*/
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
/*
* Starting actual IPI sequence...
*/
boot_error = wakeup_secondary_cpu(apicid, start_eip);
if (!boot_error) {
/*
* allow APs to start initializing.
*/
Dprintk("Before Callout %d.\n", cpu);
cpu_set(cpu, cpu_callout_map);
Dprintk("After Callout %d.\n", cpu);
/*
* Wait 5s total for a response
*/
for (timeout = 0; timeout < 50000; timeout++) {
if (cpu_isset(cpu, cpu_callin_map))
break; /* It has booted */
udelay(100);
}
if (cpu_isset(cpu, cpu_callin_map)) {
/* number CPUs logically, starting from 1 (BSP is 0) */
Dprintk("OK.\n");
printk("CPU%d: ", cpu);
print_cpu_info(&cpu_data(cpu));
Dprintk("CPU has booted.\n");
} else {
boot_error= 1;
if (*((volatile unsigned char *)trampoline_base)
== 0xA5)
/* trampoline started but...? */
printk("Stuck ??\n");
else
/* trampoline code not run */
printk("Not responding.\n");
inquire_remote_apic(apicid);
}
}
if (boot_error) {
/* Try to put things back the way they were before ... */
unmap_cpu_to_logical_apicid(cpu);
cpu_clear(cpu, cpu_callout_map); /* was set here (do_boot_cpu()) */
cpu_clear(cpu, cpu_initialized); /* was set by cpu_init() */
cpu_clear(cpu, cpu_possible_map);
per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
}
/* mark "stuck" area as not stuck */
*((volatile unsigned long *)trampoline_base) = 0;
return boot_error;
}
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
void cpu_exit_clear(void) void cpu_exit_clear(void)
{ {
@ -774,65 +305,6 @@ void __init native_smp_prepare_boot_cpu(void)
__get_cpu_var(cpu_state) = CPU_ONLINE; __get_cpu_var(cpu_state) = CPU_ONLINE;
} }
int __cpuinit native_cpu_up(unsigned int cpu)
{
int apicid = cpu_present_to_apicid(cpu);
unsigned long flags;
int err;
WARN_ON(irqs_disabled());
Dprintk("++++++++++++++++++++=_---CPU UP %u\n", cpu);
if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
!physid_isset(apicid, phys_cpu_present_map)) {
printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
return -EINVAL;
}
/*
* Already booted CPU?
*/
if (cpu_isset(cpu, cpu_callin_map)) {
Dprintk("do_boot_cpu %d Already started\n", cpu);
return -ENOSYS;
}
/*
* Save current MTRR state in case it was changed since early boot
* (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
*/
mtrr_save_state();
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
/* init low mem mapping */
clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
flush_tlb_all();
err = do_boot_cpu(apicid, cpu);
if (err < 0) {
Dprintk("do_boot_cpu failed %d\n", err);
return err;
}
/*
* Check TSC synchronization with the AP (keep irqs disabled
* while doing so):
*/
local_irq_save(flags);
check_tsc_sync_source(cpu);
local_irq_restore(flags);
while (!cpu_isset(cpu, cpu_online_map)) {
cpu_relax();
touch_nmi_watchdog();
}
return 0;
}
extern void impress_friends(void); extern void impress_friends(void);
extern void smp_checks(void); extern void smp_checks(void);

515
arch/x86/kernel/smpboot_64.c
View File

@ -71,119 +71,7 @@ int smp_threads_ready;
/* State of each CPU */ /* State of each CPU */
DEFINE_PER_CPU(int, cpu_state) = { 0 }; DEFINE_PER_CPU(int, cpu_state) = { 0 };
/* extern void smp_callin(void);
* Store all idle threads, this can be reused instead of creating
* a new thread. Also avoids complicated thread destroy functionality
* for idle threads.
*/
#ifdef CONFIG_HOTPLUG_CPU
/*
* Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
* removed after init for !CONFIG_HOTPLUG_CPU.
*/
static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
#define set_idle_for_cpu(x,p) (per_cpu(idle_thread_array, x) = (p))
#else
struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
#define get_idle_for_cpu(x) (idle_thread_array[(x)])
#define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p))
#endif
static atomic_t init_deasserted __cpuinitdata;
#define smp_callin_clear_local_apic() do {} while (0)
#define map_cpu_to_logical_apicid() do {} while (0)
/*
* Report back to the Boot Processor.
* Running on AP.
*/
void __cpuinit smp_callin(void)
{
int cpuid, phys_id;
unsigned long timeout;
/*
* If waken up by an INIT in an 82489DX configuration
* we may get here before an INIT-deassert IPI reaches
* our local APIC. We have to wait for the IPI or we'll
* lock up on an APIC access.
*/
wait_for_init_deassert(&init_deasserted);
/*
* (This works even if the APIC is not enabled.)
*/
phys_id = GET_APIC_ID(apic_read(APIC_ID));
cpuid = smp_processor_id();
if (cpu_isset(cpuid, cpu_callin_map)) {
panic("smp_callin: phys CPU#%d, CPU#%d already present??\n",
phys_id, cpuid);
}
Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
/*
* STARTUP IPIs are fragile beasts as they might sometimes
* trigger some glue motherboard logic. Complete APIC bus
* silence for 1 second, this overestimates the time the
* boot CPU is spending to send the up to 2 STARTUP IPIs
* by a factor of two. This should be enough.
*/
/*
* 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(cpuid, cpu_callout_map))
break;
cpu_relax();
}
if (!time_before(jiffies, timeout)) {
panic("smp_callin: CPU%d started up but did not get a callout!\n",
cpuid);
}
/*
* the boot CPU has finished the init stage and is spinning
* on callin_map until we finish. We are free to set up this
* CPU, first the APIC. (this is probably redundant on most
* boards)
*/
Dprintk("CALLIN, before setup_local_APIC().\n");
smp_callin_clear_local_apic();
setup_local_APIC();
end_local_APIC_setup();
map_cpu_to_logical_apicid();
/*
* Get our bogomips.
*
* Need to enable IRQs because it can take longer and then
* the NMI watchdog might kill us.
*/
local_irq_enable();
calibrate_delay();
local_irq_disable();
Dprintk("Stack at about %p\n",&cpuid);
/*
* Save our processor parameters
*/
smp_store_cpu_info(cpuid);
/*
* Allow the master to continue.
*/
cpu_set(cpuid, cpu_callin_map);
}
/* /*
* Setup code on secondary processor (after comming out of the trampoline) * Setup code on secondary processor (after comming out of the trampoline)
*/ */
@ -246,349 +134,6 @@ void __cpuinit start_secondary(void)
cpu_idle(); cpu_idle();
} }
extern volatile unsigned long init_rsp;
extern void (*initial_code)(void);
#ifdef APIC_DEBUG
static void __inquire_remote_apic(int apicid)
{
unsigned i, regs[] = { APIC_ID >> 4, APIC_LVR >> 4, APIC_SPIV >> 4 };
char *names[] = { "ID", "VERSION", "SPIV" };
int timeout;
u32 status;
printk(KERN_INFO "Inquiring remote APIC #%d...\n", apicid);
for (i = 0; i < ARRAY_SIZE(regs); i++) {
printk(KERN_INFO "... APIC #%d %s: ", apicid, names[i]);
/*
* Wait for idle.
*/
status = safe_apic_wait_icr_idle();
if (status)
printk(KERN_CONT
"a previous APIC delivery may have failed\n");
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
apic_write_around(APIC_ICR, APIC_DM_REMRD | regs[i]);
timeout = 0;
do {
udelay(100);
status = apic_read(APIC_ICR) & APIC_ICR_RR_MASK;
} while (status == APIC_ICR_RR_INPROG && timeout++ < 1000);
switch (status) {
case APIC_ICR_RR_VALID:
status = apic_read(APIC_RRR);
printk(KERN_CONT "%08x\n", status);
break;
default:
printk(KERN_CONT "failed\n");
}
}
}
#endif
/*
* Kick the secondary to wake up.
*/
static int __cpuinit wakeup_secondary_cpu(int phys_apicid,
unsigned int start_rip)
{
unsigned long send_status, accept_status = 0;
int maxlvt, num_starts, j;
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid])) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
Dprintk("Asserting INIT.\n");
/*
* Turn INIT on target chip
*/
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/*
* Send IPI
*/
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_INT_ASSERT
| APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mdelay(10);
Dprintk("Deasserting INIT.\n");
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Send IPI */
apic_write_around(APIC_ICR, APIC_INT_LEVELTRIG | APIC_DM_INIT);
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
mb();
atomic_set(&init_deasserted, 1);
if (APIC_INTEGRATED(apic_version[phys_apicid]))
num_starts = 2;
else
num_starts = 0;
/*
* Paravirt / VMI wants a startup IPI hook here to set up the
* target processor state.
*/
startup_ipi_hook(phys_apicid, (unsigned long) start_secondary,
(unsigned long) init_rsp);
/*
* Run STARTUP IPI loop.
*/
Dprintk("#startup loops: %d.\n", num_starts);
maxlvt = lapic_get_maxlvt();
for (j = 1; j <= num_starts; j++) {
Dprintk("Sending STARTUP #%d.\n",j);
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
Dprintk("After apic_write.\n");
/*
* STARTUP IPI
*/
/* Target chip */
apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
/* Boot on the stack */
/* Kick the second */
apic_write_around(APIC_ICR, APIC_DM_STARTUP | (start_rip>>12));
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(300);
Dprintk("Startup point 1.\n");
Dprintk("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
/*
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
/*
* Due to the Pentium erratum 3AP.
*/
if (maxlvt > 3) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
}
accept_status = (apic_read(APIC_ESR) & 0xEF);
if (send_status || accept_status)
break;
}
Dprintk("After Startup.\n");
if (send_status)
printk(KERN_ERR "APIC never delivered???\n");
if (accept_status)
printk(KERN_ERR "APIC delivery error (%lx).\n", accept_status);
return (send_status | accept_status);
}
struct create_idle {
struct work_struct work;
struct task_struct *idle;
struct completion done;
int cpu;
};
static void __cpuinit do_fork_idle(struct work_struct *work)
{
struct create_idle *c_idle =
container_of(work, struct create_idle, work);
c_idle->idle = fork_idle(c_idle->cpu);
complete(&c_idle->done);
}
/*
* Boot one CPU.
*/
static int __cpuinit do_boot_cpu(int cpu, int apicid)
{
unsigned long boot_error = 0;
int timeout;
unsigned long start_rip;
struct create_idle c_idle = {
.cpu = cpu,
.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
};
INIT_WORK(&c_idle.work, do_fork_idle);
/* allocate memory for gdts of secondary cpus. Hotplug is considered */
if (!cpu_gdt_descr[cpu].address &&
!(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) {
printk(KERN_ERR "Failed to allocate GDT for CPU %d\n", cpu);
return -1;
}
/* Allocate node local memory for AP pdas */
if (cpu_pda(cpu) == &boot_cpu_pda[cpu]) {
struct x8664_pda *newpda, *pda;
int node = cpu_to_node(cpu);
pda = cpu_pda(cpu);
newpda = kmalloc_node(sizeof (struct x8664_pda), GFP_ATOMIC,
node);
if (newpda) {
memcpy(newpda, pda, sizeof (struct x8664_pda));
cpu_pda(cpu) = newpda;
} else
printk(KERN_ERR
"Could not allocate node local PDA for CPU %d on node %d\n",
cpu, node);
}
alternatives_smp_switch(1);
c_idle.idle = get_idle_for_cpu(cpu);
if (c_idle.idle) {
c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *)
(THREAD_SIZE + task_stack_page(c_idle.idle))) - 1);
init_idle(c_idle.idle, cpu);
goto do_rest;
}
/*
* During cold boot process, keventd thread is not spun up yet.
* When we do cpu hot-add, we create idle threads on the fly, we should
* not acquire any attributes from the calling context. Hence the clean
* way to create kernel_threads() is to do that from keventd().
* We do the current_is_keventd() due to the fact that ACPI notifier
* was also queuing to keventd() and when the caller is already running
* in context of keventd(), we would end up with locking up the keventd
* thread.
*/
if (!keventd_up() || current_is_keventd())
c_idle.work.func(&c_idle.work);
else {
schedule_work(&c_idle.work);
wait_for_completion(&c_idle.done);
}
if (IS_ERR(c_idle.idle)) {
printk("failed fork for CPU %d\n", cpu);
return PTR_ERR(c_idle.idle);
}
set_idle_for_cpu(cpu, c_idle.idle);
do_rest:
cpu_pda(cpu)->pcurrent = c_idle.idle;
start_rip = setup_trampoline();
init_rsp = c_idle.idle->thread.sp;
load_sp0(&per_cpu(init_tss, cpu), &c_idle.idle->thread);
initial_code = start_secondary;
clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
printk(KERN_INFO "Booting processor %d/%d APIC 0x%x\n", cpu,
cpus_weight(cpu_present_map),
apicid);
/*
* This grunge runs the startup process for
* the targeted processor.
*/
atomic_set(&init_deasserted, 0);
Dprintk("Setting warm reset code and vector.\n");
smpboot_setup_warm_reset_vector(start_rip);
/*
* Be paranoid about clearing APIC errors.
*/
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
/*
* Starting actual IPI sequence...
*/
boot_error = wakeup_secondary_cpu(apicid, start_rip);
if (!boot_error) {
/*
* allow APs to start initializing.
*/
Dprintk("Before Callout %d.\n", cpu);
cpu_set(cpu, cpu_callout_map);
Dprintk("After Callout %d.\n", cpu);
/*
* Wait 5s total for a response
*/
for (timeout = 0; timeout < 50000; timeout++) {
if (cpu_isset(cpu, cpu_callin_map))
break; /* It has booted */
udelay(100);
}
if (cpu_isset(cpu, cpu_callin_map)) {
/* number CPUs logically, starting from 1 (BSP is 0) */
Dprintk("CPU has booted.\n");
printk(KERN_INFO "CPU%d: ", cpu);
print_cpu_info(&cpu_data(cpu));
} else {
boot_error = 1;
if (*((volatile unsigned char *)trampoline_base)
== 0xA5)
/* trampoline started but...? */
printk("Stuck ??\n");
else
/* trampoline code not run */
printk("Not responding.\n");
#ifdef APIC_DEBUG
inquire_remote_apic(apicid);
#endif
}
}
if (boot_error) {
cpu_clear(cpu, cpu_callout_map); /* was set here (do_boot_cpu()) */
clear_bit(cpu, (unsigned long *)&cpu_initialized); /* was set by cpu_init() */
clear_node_cpumask(cpu); /* was set by numa_add_cpu */
cpu_clear(cpu, cpu_present_map);
cpu_clear(cpu, cpu_possible_map);
per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
}
/* mark "stuck" area as not stuck */
*((volatile unsigned long *)trampoline_base) = 0;
return boot_error;
}
cycles_t cacheflush_time; cycles_t cacheflush_time;
unsigned long cache_decay_ticks; unsigned long cache_decay_ticks;
@ -745,64 +290,6 @@ void __init native_smp_prepare_boot_cpu(void)
per_cpu(cpu_state, me) = CPU_ONLINE; per_cpu(cpu_state, me) = CPU_ONLINE;
} }
/*
* Entry point to boot a CPU.
*/
int __cpuinit native_cpu_up(unsigned int cpu)
{
int apicid = cpu_present_to_apicid(cpu);
unsigned long flags;
int err;
WARN_ON(irqs_disabled());
Dprintk("++++++++++++++++++++=_---CPU UP %u\n", cpu);
if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
!physid_isset(apicid, phys_cpu_present_map)) {
printk("__cpu_up: bad cpu %d\n", cpu);
return -EINVAL;
}
/*
* Already booted CPU?
*/
if (cpu_isset(cpu, cpu_callin_map)) {
Dprintk("do_boot_cpu %d Already started\n", cpu);
return -ENOSYS;
}
/*
* Save current MTRR state in case it was changed since early boot
* (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
*/
mtrr_save_state();
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
/* Boot it! */
err = do_boot_cpu(cpu, apicid);
if (err < 0) {
Dprintk("do_boot_cpu failed %d\n", err);
return err;
}
/* Unleash the CPU! */
Dprintk("waiting for cpu %d\n", cpu);
/*
* Make sure and check TSC sync:
*/
local_irq_save(flags);
check_tsc_sync_source(cpu);
local_irq_restore(flags);
while (!cpu_isset(cpu, cpu_online_map))
cpu_relax();
err = 0;
return err;
}
extern void impress_friends(void); extern void impress_friends(void);
extern void smp_checks(void); extern void smp_checks(void);

3
include/asm-x86/smp.h
View File

@ -9,6 +9,7 @@ extern cpumask_t cpu_callout_map;
extern int smp_num_siblings; extern int smp_num_siblings;
extern unsigned int num_processors; extern unsigned int num_processors;
extern cpumask_t cpu_initialized;
extern u16 x86_cpu_to_apicid_init[]; extern u16 x86_cpu_to_apicid_init[];
extern u16 x86_bios_cpu_apicid_init[]; extern u16 x86_bios_cpu_apicid_init[];
@ -34,6 +35,8 @@ extern struct {
unsigned short ss; unsigned short ss;
} stack_start; } stack_start;
extern unsigned long init_rsp;
extern unsigned long initial_code;
struct smp_ops { struct smp_ops {
void (*smp_prepare_boot_cpu)(void); void (*smp_prepare_boot_cpu)(void);