/* State of each CPU. */
DEFINE_PER_CPU(int, cpu_state) = { 0 };
-/* 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;
-
-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);
-}
+extern void smp_callin(void);
/*
* 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
:"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
void cpu_exit_clear(void)
{
__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 smp_checks(void);
git.samba.org / sfrench / cifs-2.6.git / blobdiff