asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
{
int cpu;
int sender;
union smp_flush_state *f;
cpu = smp_processor_id();
/*
* orig_rax contains the interrupt vector - 256.
* Use that to determine where the sender put the data.
*/
sender = regs->orig_rax + 256 - INVALIDATE_TLB_VECTOR_START;
f = &per_cpu(flush_state, sender);
if (!cpu_isset(cpu, f->flush_cpumask))
goto out;
/*
* This was a BUG() but until someone can quote me the
* line from the intel manual that guarantees an IPI to
* multiple CPUs is retried _only_ on the erroring CPUs
* its staying as a return
*
* BUG();
*/
if (f->flush_mm == read_pda(active_mm)) {
if (read_pda(mmu_state) == TLBSTATE_OK) {
if (f->flush_va == FLUSH_ALL)
local_flush_tlb();
else
__flush_tlb_one(f->flush_va);
} else
leave_mm(cpu);
}
out:
ack_APIC_irq();
cpu_clear(cpu, f->flush_cpumask);
}
/*
* acpi_create_identity_pmd
*
* Create a new, identity mapped pmd.
*
* Do this by creating new page directory, and marking all the pages as R/W
* Then set it as the new Page Middle Directory.
* And, of course, flush the TLB so it takes effect.
*
* We save the address of the old one, for later restoration.
*/
static void acpi_create_identity_pmd (void)
{
pgd_t *pgd;
int i;
ptep = (pte_t*)__get_free_page(GFP_KERNEL);
/* fill page with low mapping */
for (i = 0; i < PTRS_PER_PTE; i++)
set_pte(ptep + i, mk_pte_phys(i << PAGE_SHIFT, PAGE_SHARED));
pgd = pgd_offset(current->active_mm, 0);
pmd = pmd_alloc(current->mm,pgd, 0);
/* save the old pmd */
saved_pmd = *pmd;
/* set the new one */
set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(ptep)));
/* flush the TLB */
local_flush_tlb();
}
irqreturn_t smp_invalidate_interrupt(int irq, void *dev_id,
struct pt_regs *regs)
{
unsigned long cpu;
cpu = get_cpu();
if (current->active_mm)
load_user_cs_desc(cpu, current->active_mm);
if (!cpu_isset(cpu, flush_cpumask))
goto out;
/*
* This was a BUG() but until someone can quote me the
* line from the intel manual that guarantees an IPI to
* multiple CPUs is retried _only_ on the erroring CPUs
* its staying as a return
*
* BUG();
*/
if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) {
if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) {
if (flush_va == FLUSH_ALL)
local_flush_tlb();
else
__flush_tlb_one(flush_va);
} else
leave_mm(cpu);
}
smp_mb__before_clear_bit();
cpu_clear(cpu, flush_cpumask);
smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
return IRQ_HANDLED;
}
/*
* Bring a secondary processor online.
*/
void __cpuinit online_secondary(void)
{
/*
* low-memory mappings have been cleared, flush them from
* the local TLBs too.
*/
local_flush_tlb();
BUG_ON(in_interrupt());
/* This must be done before setting cpu_online_mask */
wmb();
/*
* We need to hold call_lock, so there is no inconsistency
* between the time smp_call_function() determines number of
* IPI recipients, and the time when the determination is made
* for which cpus receive the IPI. Holding this
* lock helps us to not include this cpu in a currently in progress
* smp_call_function().
*/
ipi_call_lock();
set_cpu_online(smp_processor_id(), 1);
ipi_call_unlock();
__get_cpu_var(cpu_state) = CPU_ONLINE;
/* Set up tile-specific state for this cpu. */
setup_cpu(0);
/* Set up tile-timer clock-event device on this cpu */
setup_tile_timer();
preempt_enable();
cpu_idle();
}
/*
* acpi_restore_pmd
*
* Restore the old pmd saved by acpi_create_identity_pmd and
* free the page that said function alloc'd
*/
static void acpi_restore_pmd (void)
{
set_pmd(pmd, saved_pmd);
local_flush_tlb();
free_page((unsigned long)ptep);
}
static void __init smp_boot_cpus(unsigned int max_cpus)
{
unsigned apicid, cpu, bit, kicked;
nmi_watchdog_default();
/*
* Setup boot CPU information
*/
smp_store_cpu_info(0); /* Final full version of the data */
printk(KERN_INFO "CPU%d: ", 0);
print_cpu_info(&cpu_data[0]);
current_thread_info()->cpu = 0;
smp_tune_scheduling();
if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
hard_smp_processor_id());
physid_set(hard_smp_processor_id(), phys_cpu_present_map);
}
/*
* If we couldn't find an SMP configuration at boot time,
* get out of here now!
*/
if (!smp_found_config) {
printk(KERN_NOTICE "SMP motherboard not detected.\n");
io_apic_irqs = 0;
cpu_online_map = cpumask_of_cpu(0);
cpu_set(0, cpu_sibling_map[0]);
phys_cpu_present_map = physid_mask_of_physid(0);
if (APIC_init_uniprocessor())
printk(KERN_NOTICE "Local APIC not detected."
" Using dummy APIC emulation.\n");
goto smp_done;
}
/*
* Should not be necessary because the MP table should list the boot
* CPU too, but we do it for the sake of robustness anyway.
*/
if (!physid_isset(boot_cpu_id, phys_cpu_present_map)) {
printk(KERN_NOTICE "weird, boot CPU (#%d) not listed by the BIOS.\n",
boot_cpu_id);
physid_set(hard_smp_processor_id(), phys_cpu_present_map);
}
/*
* If we couldn't find a local APIC, then get out of here now!
*/
if (APIC_INTEGRATED(apic_version[boot_cpu_id]) && !cpu_has_apic) {
printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
boot_cpu_id);
printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
io_apic_irqs = 0;
cpu_online_map = cpumask_of_cpu(0);
cpu_set(0, cpu_sibling_map[0]);
phys_cpu_present_map = physid_mask_of_physid(0);
disable_apic = 1;
goto smp_done;
}
verify_local_APIC();
/*
* If SMP should be disabled, then really disable it!
*/
if (!max_cpus) {
smp_found_config = 0;
printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
io_apic_irqs = 0;
cpu_online_map = cpumask_of_cpu(0);
cpu_set(0, cpu_sibling_map[0]);
phys_cpu_present_map = physid_mask_of_physid(0);
disable_apic = 1;
goto smp_done;
}
connect_bsp_APIC();
setup_local_APIC();
if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_id)
BUG();
x86_cpu_to_apicid[0] = boot_cpu_id;
/*
* Now scan the CPU present map and fire up the other CPUs.
*/
Dprintk("CPU present map: %lx\n", physids_coerce(phys_cpu_present_map));
kicked = 1;
for (bit = 0; kicked < NR_CPUS && bit < MAX_APICS; bit++) {
apicid = cpu_present_to_apicid(bit);
/*
* Don't even attempt to start the boot CPU!
*/
if (apicid == boot_cpu_id || (apicid == BAD_APICID))
continue;
if (!physid_isset(apicid, phys_cpu_present_map))
continue;
if ((max_cpus >= 0) && (max_cpus <= cpucount+1))
continue;
do_boot_cpu(apicid);
++kicked;
}
/*
* Cleanup possible dangling ends...
*/
{
/*
* Install writable page 0 entry to set BIOS data area.
*/
local_flush_tlb();
/*
* Paranoid: Set warm reset code and vector here back
* to default values.
*/
CMOS_WRITE(0, 0xf);
*((volatile int *) phys_to_virt(0x467)) = 0;
}
/*
* Allow the user to impress friends.
*/
Dprintk("Before bogomips.\n");
if (!cpucount) {
printk(KERN_INFO "Only one processor found.\n");
} else {
unsigned long bogosum = 0;
for (cpu = 0; cpu < NR_CPUS; cpu++)
if (cpu_isset(cpu, cpu_callout_map))
bogosum += cpu_data[cpu].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");
}
/*
* Construct cpu_sibling_map[], so that we can tell the
* sibling CPU efficiently.
*/
for (cpu = 0; cpu < NR_CPUS; cpu++)
cpus_clear(cpu_sibling_map[cpu]);
for (cpu = 0; cpu < NR_CPUS; cpu++) {
int siblings = 0;
int i;
if (!cpu_isset(cpu, cpu_callout_map))
continue;
if (smp_num_siblings > 1) {
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_isset(i, cpu_callout_map))
continue;
if (phys_proc_id[cpu] == phys_proc_id[i]) {
siblings++;
cpu_set(i, cpu_sibling_map[cpu]);
}
}
} else {
siblings++;
cpu_set(cpu, cpu_sibling_map[cpu]);
}
if (siblings != smp_num_siblings) {
printk(KERN_WARNING
"WARNING: %d siblings found for CPU%d, should be %d\n",
siblings, cpu, smp_num_siblings);
smp_num_siblings = siblings;
}
}
Dprintk("Boot done.\n");
/*
* Here we can be sure that there is an IO-APIC in the system. Let's
* go and set it up:
*/
if (!skip_ioapic_setup && nr_ioapics)
setup_IO_APIC();
else
nr_ioapics = 0;
setup_boot_APIC_clock();
/*
* Synchronize the TSC with the AP
*/
if (cpu_has_tsc && cpucount)
synchronize_tsc_bp();
smp_done:
time_init_smp();
}
static void __init do_boot_cpu (int apicid)
{
struct task_struct *idle;
unsigned long boot_error;
int timeout, cpu;
unsigned long start_rip;
cpu = ++cpucount;
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
*/
idle = fork_idle(cpu);
if (IS_ERR(idle))
panic("failed fork for CPU %d", cpu);
x86_cpu_to_apicid[cpu] = apicid;
cpu_pda[cpu].pcurrent = idle;
start_rip = setup_trampoline();
init_rsp = idle->thread.rsp;
per_cpu(init_tss,cpu).rsp0 = init_rsp;
initial_code = start_secondary;
clear_ti_thread_flag(idle->thread_info, TIF_FORK);
printk(KERN_INFO "Booting processor %d/%d rip %lx rsp %lx\n", cpu, apicid,
start_rip, init_rsp);
/*
* This grunge runs the startup process for
* the targeted processor.
*/
atomic_set(&init_deasserted, 0);
Dprintk("Setting warm reset code and vector.\n");
CMOS_WRITE(0xa, 0xf);
local_flush_tlb();
Dprintk("1.\n");
*((volatile unsigned short *) phys_to_virt(0x469)) = start_rip >> 4;
Dprintk("2.\n");
*((volatile unsigned short *) phys_to_virt(0x467)) = start_rip & 0xf;
Dprintk("3.\n");
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[apicid])) {
apic_read_around(APIC_SPIV);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
/*
* Status is now clean
*/
boot_error = 0;
/*
* Starting actual IPI sequence...
*/
boot_error = wakeup_secondary_via_INIT(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("OK.\n");
print_cpu_info(&cpu_data[cpu]);
Dprintk("CPU has booted.\n");
} else {
boot_error = 1;
if (*((volatile unsigned char *)phys_to_virt(SMP_TRAMPOLINE_BASE))
== 0xA5)
/* trampoline started but...? */
printk("Stuck ??\n");
else
/* trampoline code not run */
printk("Not responding.\n");
#if 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, &cpu_initialized); /* was set by cpu_init() */
cpucount--;
x86_cpu_to_apicid[cpu] = BAD_APICID;
x86_cpu_to_log_apicid[cpu] = BAD_APICID;
}
}