* Rusty Russell : Hacked into shape for new "hotplug" boot process. */
#include <linux/module.h>
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/smp_lock.h>
-#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <asm/tlbflush.h>
#include <asm/desc.h>
#include <asm/arch_hooks.h>
+#include <asm/nmi.h>
#include <mach_apic.h>
#include <mach_wakecpu.h>
#include <smpboot_hooks.h>
/* Set if we find a B stepping CPU */
-static int __initdata smp_b_stepping;
+static int __devinitdata smp_b_stepping;
/* Number of siblings per CPU package */
int smp_num_siblings = 1;
#ifdef CONFIG_X86_HT
EXPORT_SYMBOL(smp_num_siblings);
#endif
-int phys_proc_id[NR_CPUS]; /* Package ID of each logical CPU */
-EXPORT_SYMBOL(phys_proc_id);
-int cpu_core_id[NR_CPUS]; /* Core ID of each logical CPU */
-EXPORT_SYMBOL(cpu_core_id);
+
+/* Last level cache ID of each logical CPU */
+int cpu_llc_id[NR_CPUS] __cpuinitdata = {[0 ... NR_CPUS-1] = BAD_APICID};
+
+/* representing HT siblings of each logical CPU */
+cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(cpu_sibling_map);
+
+/* representing HT and core siblings of each logical CPU */
+cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(cpu_core_map);
/* bitmap of online cpus */
-cpumask_t cpu_online_map;
+cpumask_t cpu_online_map __read_mostly;
EXPORT_SYMBOL(cpu_online_map);
cpumask_t cpu_callin_map;
cpumask_t cpu_callout_map;
EXPORT_SYMBOL(cpu_callout_map);
+cpumask_t cpu_possible_map;
+EXPORT_SYMBOL(cpu_possible_map);
static cpumask_t smp_commenced_mask;
+/* TSC's upper 32 bits can't be written in eariler CPU (before prescott), there
+ * is no way to resync one AP against BP. TBD: for prescott and above, we
+ * should use IA64's algorithm
+ */
+static int __devinitdata tsc_sync_disabled;
+
/* Per CPU bogomips and other parameters */
struct cpuinfo_x86 cpu_data[NR_CPUS] __cacheline_aligned;
EXPORT_SYMBOL(cpu_data);
-u8 x86_cpu_to_apicid[NR_CPUS] =
+u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly =
{ [0 ... NR_CPUS-1] = 0xff };
EXPORT_SYMBOL(x86_cpu_to_apicid);
+u8 apicid_2_node[MAX_APICID];
+
/*
* Trampoline 80x86 program as an array.
*/
* has made sure it's suitably aligned.
*/
-static unsigned long __init setup_trampoline(void)
+static unsigned long __devinit setup_trampoline(void)
{
memcpy(trampoline_base, trampoline_data, trampoline_end - trampoline_data);
return virt_to_phys(trampoline_base);
* a given CPU
*/
-static void __init smp_store_cpu_info(int id)
+static void __devinit smp_store_cpu_info(int id)
{
struct cpuinfo_x86 *c = cpu_data + id;
*/
if ((c->x86_vendor == X86_VENDOR_AMD) && (c->x86 == 6)) {
+ if (num_possible_cpus() == 1)
+ goto valid_k7;
+
/* Athlon 660/661 is valid. */
if ((c->x86_model==6) && ((c->x86_mask==0) || (c->x86_mask==1)))
goto valid_k7;
goto valid_k7;
/* If we get here, it's not a certified SMP capable AMD system. */
- tainted |= TAINT_UNSAFE_SMP;
+ add_taint(TAINT_UNSAFE_SMP);
}
valid_k7:
* then we print a warning if not, and always resync.
*/
-static atomic_t tsc_start_flag = ATOMIC_INIT(0);
-static atomic_t tsc_count_start = ATOMIC_INIT(0);
-static atomic_t tsc_count_stop = ATOMIC_INIT(0);
-static unsigned long long tsc_values[NR_CPUS];
+static struct {
+ atomic_t start_flag;
+ atomic_t count_start;
+ atomic_t count_stop;
+ unsigned long long values[NR_CPUS];
+} tsc __initdata = {
+ .start_flag = ATOMIC_INIT(0),
+ .count_start = ATOMIC_INIT(0),
+ .count_stop = ATOMIC_INIT(0),
+};
#define NR_LOOPS 5
-static void __init synchronize_tsc_bp (void)
+static void __init synchronize_tsc_bp(void)
{
int i;
unsigned long long t0;
/* convert from kcyc/sec to cyc/usec */
one_usec = cpu_khz / 1000;
- atomic_set(&tsc_start_flag, 1);
+ atomic_set(&tsc.start_flag, 1);
wmb();
/*
/*
* all APs synchronize but they loop on '== num_cpus'
*/
- while (atomic_read(&tsc_count_start) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_stop, 0);
+ while (atomic_read(&tsc.count_start) != num_booting_cpus()-1)
+ cpu_relax();
+ atomic_set(&tsc.count_stop, 0);
wmb();
/*
* this lets the APs save their current TSC:
*/
- atomic_inc(&tsc_count_start);
+ atomic_inc(&tsc.count_start);
- rdtscll(tsc_values[smp_processor_id()]);
+ rdtscll(tsc.values[smp_processor_id()]);
/*
* We clear the TSC in the last loop:
*/
/*
* Wait for all APs to leave the synchronization point:
*/
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_start, 0);
+ while (atomic_read(&tsc.count_stop) != num_booting_cpus()-1)
+ cpu_relax();
+ atomic_set(&tsc.count_start, 0);
wmb();
- atomic_inc(&tsc_count_stop);
+ atomic_inc(&tsc.count_stop);
}
sum = 0;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_isset(i, cpu_callout_map)) {
- t0 = tsc_values[i];
+ t0 = tsc.values[i];
sum += t0;
}
}
avg = sum;
do_div(avg, num_booting_cpus());
- sum = 0;
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_isset(i, cpu_callout_map))
continue;
- delta = tsc_values[i] - avg;
+ delta = tsc.values[i] - avg;
if (delta < 0)
delta = -delta;
/*
* We report bigger than 2 microseconds clock differences.
*/
if (delta > 2*one_usec) {
- long realdelta;
+ long long realdelta;
+
if (!buggy) {
buggy = 1;
printk("\n");
}
realdelta = delta;
do_div(realdelta, one_usec);
- if (tsc_values[i] < avg)
+ if (tsc.values[i] < avg)
realdelta = -realdelta;
- printk(KERN_INFO "CPU#%d had %ld usecs TSC skew, fixed it up.\n", i, realdelta);
+ if (realdelta)
+ printk(KERN_INFO "CPU#%d had %Ld usecs TSC "
+ "skew, fixed it up.\n", i, realdelta);
}
-
- sum += delta;
}
if (!buggy)
printk("passed.\n");
}
-static void __init synchronize_tsc_ap (void)
+static void __init synchronize_tsc_ap(void)
{
int i;
* this gets called, so we first wait for the BP to
* finish SMP initialization:
*/
- while (!atomic_read(&tsc_start_flag)) mb();
+ while (!atomic_read(&tsc.start_flag))
+ cpu_relax();
for (i = 0; i < NR_LOOPS; i++) {
- atomic_inc(&tsc_count_start);
- while (atomic_read(&tsc_count_start) != num_booting_cpus())
- mb();
+ atomic_inc(&tsc.count_start);
+ while (atomic_read(&tsc.count_start) != num_booting_cpus())
+ cpu_relax();
- rdtscll(tsc_values[smp_processor_id()]);
+ rdtscll(tsc.values[smp_processor_id()]);
if (i == NR_LOOPS-1)
write_tsc(0, 0);
- atomic_inc(&tsc_count_stop);
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()) mb();
+ atomic_inc(&tsc.count_stop);
+ while (atomic_read(&tsc.count_stop) != num_booting_cpus())
+ cpu_relax();
}
}
#undef NR_LOOPS
static atomic_t init_deasserted;
-static void __init smp_callin(void)
+static void __devinit smp_callin(void)
{
int cpuid, phys_id;
unsigned long timeout;
/*
* Synchronize the TSC with the BP
*/
- if (cpu_has_tsc && cpu_khz)
+ if (cpu_has_tsc && cpu_khz && !tsc_sync_disabled)
synchronize_tsc_ap();
}
static int cpucount;
+/* maps the cpu to the sched domain representing multi-core */
+cpumask_t cpu_coregroup_map(int cpu)
+{
+ struct cpuinfo_x86 *c = cpu_data + cpu;
+ /*
+ * For perf, we return last level cache shared map.
+ * And for power savings, we return cpu_core_map
+ */
+ if (sched_mc_power_savings || sched_smt_power_savings)
+ return cpu_core_map[cpu];
+ else
+ return c->llc_shared_map;
+}
+
+/* representing cpus for which sibling maps can be computed */
+static cpumask_t cpu_sibling_setup_map;
+
+static inline void
+set_cpu_sibling_map(int cpu)
+{
+ int i;
+ struct cpuinfo_x86 *c = cpu_data;
+
+ cpu_set(cpu, cpu_sibling_setup_map);
+
+ if (smp_num_siblings > 1) {
+ for_each_cpu_mask(i, cpu_sibling_setup_map) {
+ if (c[cpu].phys_proc_id == c[i].phys_proc_id &&
+ c[cpu].cpu_core_id == c[i].cpu_core_id) {
+ cpu_set(i, cpu_sibling_map[cpu]);
+ cpu_set(cpu, cpu_sibling_map[i]);
+ cpu_set(i, cpu_core_map[cpu]);
+ cpu_set(cpu, cpu_core_map[i]);
+ cpu_set(i, c[cpu].llc_shared_map);
+ cpu_set(cpu, c[i].llc_shared_map);
+ }
+ }
+ } else {
+ cpu_set(cpu, cpu_sibling_map[cpu]);
+ }
+
+ cpu_set(cpu, c[cpu].llc_shared_map);
+
+ if (current_cpu_data.x86_max_cores == 1) {
+ cpu_core_map[cpu] = cpu_sibling_map[cpu];
+ c[cpu].booted_cores = 1;
+ return;
+ }
+
+ for_each_cpu_mask(i, cpu_sibling_setup_map) {
+ if (cpu_llc_id[cpu] != BAD_APICID &&
+ cpu_llc_id[cpu] == cpu_llc_id[i]) {
+ cpu_set(i, c[cpu].llc_shared_map);
+ cpu_set(cpu, c[i].llc_shared_map);
+ }
+ if (c[cpu].phys_proc_id == c[i].phys_proc_id) {
+ cpu_set(i, cpu_core_map[cpu]);
+ cpu_set(cpu, cpu_core_map[i]);
+ /*
+ * Does this new cpu bringup a new core?
+ */
+ if (cpus_weight(cpu_sibling_map[cpu]) == 1) {
+ /*
+ * for each core in package, increment
+ * the booted_cores for this new cpu
+ */
+ if (first_cpu(cpu_sibling_map[i]) == i)
+ c[cpu].booted_cores++;
+ /*
+ * increment the core count for all
+ * the other cpus in this package
+ */
+ if (i != cpu)
+ c[i].booted_cores++;
+ } else if (i != cpu && !c[cpu].booted_cores)
+ c[cpu].booted_cores = c[i].booted_cores;
+ }
+ }
+}
+
/*
* Activate a secondary processor.
*/
-static void __init start_secondary(void *unused)
+static void __devinit start_secondary(void *unused)
{
/*
* Dont put anything before smp_callin(), SMP
* things done here to the most necessary things.
*/
cpu_init();
+ preempt_disable();
smp_callin();
while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
rep_nop();
*/
local_flush_tlb();
+ /* This must be done before setting cpu_online_map */
+ set_cpu_sibling_map(raw_smp_processor_id());
+ wmb();
+
/*
* We need to hold call_lock, so there is no inconsistency
* between the time smp_call_function() determines number of
lock_ipi_call_lock();
cpu_set(smp_processor_id(), cpu_online_map);
unlock_ipi_call_lock();
+ per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
/* We can take interrupts now: we're officially "up". */
local_irq_enable();
* from the task structure
* This function must not return.
*/
-void __init initialize_secondary(void)
+void __devinit initialize_secondary(void)
{
/*
* We don't actually need to load the full TSS,
#ifdef CONFIG_NUMA
/* which logical CPUs are on which nodes */
-cpumask_t node_2_cpu_mask[MAX_NUMNODES] =
+cpumask_t node_2_cpu_mask[MAX_NUMNODES] __read_mostly =
{ [0 ... MAX_NUMNODES-1] = CPU_MASK_NONE };
+EXPORT_SYMBOL(node_2_cpu_mask);
/* which node each logical CPU is on */
-int cpu_2_node[NR_CPUS] = { [0 ... NR_CPUS-1] = 0 };
+int cpu_2_node[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
EXPORT_SYMBOL(cpu_2_node);
/* set up a mapping between cpu and node. */
#endif /* CONFIG_NUMA */
-u8 cpu_2_logical_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
+u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
static void map_cpu_to_logical_apicid(void)
{
int cpu = smp_processor_id();
int apicid = logical_smp_processor_id();
+ int node = apicid_to_node(apicid);
+
+ if (!node_online(node))
+ node = first_online_node;
cpu_2_logical_apicid[cpu] = apicid;
- map_cpu_to_node(cpu, apicid_to_node(apicid));
+ map_cpu_to_node(cpu, node);
}
static void unmap_cpu_to_logical_apicid(int cpu)
printk("Inquiring remote APIC #%d...\n", apicid);
- for (i = 0; i < sizeof(regs) / sizeof(*regs); i++) {
+ for (i = 0; i < ARRAY_SIZE(regs); i++) {
printk("... APIC #%d %s: ", apicid, names[i]);
/*
* 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 __init
+static int __devinit
wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip)
{
unsigned long send_status = 0, accept_status = 0;
#endif /* WAKE_SECONDARY_VIA_NMI */
#ifdef WAKE_SECONDARY_VIA_INIT
-static int __init
+static int __devinit
wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
{
unsigned long send_status = 0, accept_status = 0;
#endif /* WAKE_SECONDARY_VIA_INIT */
extern cpumask_t cpu_initialized;
+static inline int alloc_cpu_id(void)
+{
+ cpumask_t tmp_map;
+ int cpu;
+ cpus_complement(tmp_map, cpu_present_map);
+ cpu = first_cpu(tmp_map);
+ if (cpu >= NR_CPUS)
+ return -ENODEV;
+ return cpu;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static struct task_struct * __devinitdata cpu_idle_tasks[NR_CPUS];
+static inline struct task_struct * alloc_idle_task(int cpu)
+{
+ struct task_struct *idle;
+
+ if ((idle = cpu_idle_tasks[cpu]) != NULL) {
+ /* initialize thread_struct. we really want to avoid destroy
+ * idle tread
+ */
+ idle->thread.esp = (unsigned long)task_pt_regs(idle);
+ init_idle(idle, cpu);
+ return idle;
+ }
+ idle = fork_idle(cpu);
-static int __init do_boot_cpu(int apicid)
+ if (!IS_ERR(idle))
+ cpu_idle_tasks[cpu] = idle;
+ return idle;
+}
+#else
+#define alloc_idle_task(cpu) fork_idle(cpu)
+#endif
+
+static int __devinit 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.
{
struct task_struct *idle;
unsigned long boot_error;
- int timeout, cpu;
+ int timeout;
unsigned long start_eip;
unsigned short nmi_high = 0, nmi_low = 0;
- cpu = ++cpucount;
+ ++cpucount;
+ alternatives_smp_switch(1);
+
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
*/
- idle = fork_idle(cpu);
+ idle = alloc_idle_task(cpu);
if (IS_ERR(idle))
panic("failed fork for CPU %d", cpu);
idle->thread.eip = (unsigned long) start_secondary;
irq_ctx_init(cpu);
+ x86_cpu_to_apicid[cpu] = apicid;
/*
* This grunge runs the startup process for
* the targeted processor.
inquire_remote_apic(apicid);
}
}
- x86_cpu_to_apicid[cpu] = 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() */
cpucount--;
+ } else {
+ x86_cpu_to_apicid[cpu] = apicid;
+ cpu_set(cpu, cpu_present_map);
}
/* mark "stuck" area as not stuck */
return boot_error;
}
+#ifdef CONFIG_HOTPLUG_CPU
+void cpu_exit_clear(void)
+{
+ int cpu = raw_smp_processor_id();
+
+ idle_task_exit();
+
+ cpucount --;
+ cpu_uninit();
+ irq_ctx_exit(cpu);
+
+ cpu_clear(cpu, cpu_callout_map);
+ cpu_clear(cpu, cpu_callin_map);
+
+ cpu_clear(cpu, smp_commenced_mask);
+ unmap_cpu_to_logical_apicid(cpu);
+}
+
+struct warm_boot_cpu_info {
+ struct completion *complete;
+ struct work_struct task;
+ int apicid;
+ int cpu;
+};
+
+static void __cpuinit do_warm_boot_cpu(struct work_struct *work)
+{
+ struct warm_boot_cpu_info *info =
+ container_of(work, struct warm_boot_cpu_info, task);
+ do_boot_cpu(info->apicid, info->cpu);
+ complete(info->complete);
+}
+
+static int __cpuinit __smp_prepare_cpu(int cpu)
+{
+ DECLARE_COMPLETION_ONSTACK(done);
+ struct warm_boot_cpu_info info;
+ int apicid, ret;
+ struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
+
+ apicid = x86_cpu_to_apicid[cpu];
+ if (apicid == BAD_APICID) {
+ ret = -ENODEV;
+ goto exit;
+ }
+
+ /*
+ * the CPU isn't initialized at boot time, allocate gdt table here.
+ * cpu_init will initialize it
+ */
+ if (!cpu_gdt_descr->address) {
+ cpu_gdt_descr->address = get_zeroed_page(GFP_KERNEL);
+ if (!cpu_gdt_descr->address)
+ printk(KERN_CRIT "CPU%d failed to allocate GDT\n", cpu);
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ info.complete = &done;
+ info.apicid = apicid;
+ info.cpu = cpu;
+ INIT_WORK(&info.task, do_warm_boot_cpu);
+
+ tsc_sync_disabled = 1;
+
+ /* init low mem mapping */
+ clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
+ KERNEL_PGD_PTRS);
+ flush_tlb_all();
+ schedule_work(&info.task);
+ wait_for_completion(&done);
+
+ tsc_sync_disabled = 0;
+ zap_low_mappings();
+ ret = 0;
+exit:
+ return ret;
+}
+#endif
+
static void smp_tune_scheduling (void)
{
unsigned long cachesize; /* kB */
cachesize = 16; /* Pentiums, 2x8kB cache */
bandwidth = 100;
}
+ max_cache_size = cachesize * 1024;
}
}
EXPORT_SYMBOL(xquad_portio);
#endif
-cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
-#ifdef CONFIG_X86_HT
-EXPORT_SYMBOL(cpu_sibling_map);
-#endif
-cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
-EXPORT_SYMBOL(cpu_core_map);
-
static void __init smp_boot_cpus(unsigned int max_cpus)
{
int apicid, cpu, bit, kicked;
current_thread_info()->cpu = 0;
smp_tune_scheduling();
- cpus_clear(cpu_sibling_map[0]);
- cpu_set(0, cpu_sibling_map[0]);
- cpus_clear(cpu_core_map[0]);
- cpu_set(0, cpu_core_map[0]);
+ set_cpu_sibling_map(0);
/*
* If we couldn't find an SMP configuration at boot time,
if (max_cpus <= cpucount+1)
continue;
- if (do_boot_cpu(apicid))
+ if (((cpu = alloc_cpu_id()) <= 0) || do_boot_cpu(apicid, cpu))
printk("CPU #%d not responding - cannot use it.\n",
apicid);
else
cpus_clear(cpu_core_map[cpu]);
}
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
- struct cpuinfo_x86 *c = cpu_data + 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 (cpu_core_id[cpu] == cpu_core_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;
- }
-
- if (c->x86_num_cores > 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]) {
- cpu_set(i, cpu_core_map[cpu]);
- }
- }
- } else {
- cpu_core_map[cpu] = cpu_sibling_map[cpu];
- }
- }
+ cpu_set(0, cpu_sibling_map[0]);
+ cpu_set(0, cpu_core_map[0]);
smpboot_setup_io_apic();
{
cpu_set(smp_processor_id(), cpu_online_map);
cpu_set(smp_processor_id(), cpu_callout_map);
+ cpu_set(smp_processor_id(), cpu_present_map);
+ cpu_set(smp_processor_id(), cpu_possible_map);
+ per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
}
#ifdef CONFIG_HOTPLUG_CPU
-
-/* must be called with the cpucontrol mutex held */
-static int __devinit cpu_enable(unsigned int cpu)
+static void
+remove_siblinginfo(int cpu)
{
- /* get the target out of its holding state */
- per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
- wmb();
+ int sibling;
+ struct cpuinfo_x86 *c = cpu_data;
- /* wait for the processor to ack it. timeout? */
- while (!cpu_online(cpu))
- cpu_relax();
-
- fixup_irqs(cpu_online_map);
- /* counter the disable in fixup_irqs() */
- local_irq_enable();
- return 0;
+ for_each_cpu_mask(sibling, cpu_core_map[cpu]) {
+ cpu_clear(cpu, cpu_core_map[sibling]);
+ /*
+ * last thread sibling in this cpu core going down
+ */
+ if (cpus_weight(cpu_sibling_map[cpu]) == 1)
+ c[sibling].booted_cores--;
+ }
+
+ for_each_cpu_mask(sibling, cpu_sibling_map[cpu])
+ cpu_clear(cpu, cpu_sibling_map[sibling]);
+ cpus_clear(cpu_sibling_map[cpu]);
+ cpus_clear(cpu_core_map[cpu]);
+ c[cpu].phys_proc_id = 0;
+ c[cpu].cpu_core_id = 0;
+ cpu_clear(cpu, cpu_sibling_setup_map);
}
int __cpu_disable(void)
*/
if (cpu == 0)
return -EBUSY;
-
- /* We enable the timer again on the exit path of the death loop */
- disable_APIC_timer();
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ stop_apic_nmi_watchdog(NULL);
+ clear_local_APIC();
/* Allow any queued timer interrupts to get serviced */
local_irq_enable();
mdelay(1);
local_irq_disable();
+ remove_siblinginfo(cpu);
+
cpu_clear(cpu, map);
fixup_irqs(map);
/* It's now safe to remove this processor from the online map */
for (i = 0; i < 10; i++) {
/* They ack this in play_dead by setting CPU_DEAD */
- if (per_cpu(cpu_state, cpu) == CPU_DEAD)
+ if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
+ printk ("CPU %d is now offline\n", cpu);
+ if (1 == num_online_cpus())
+ alternatives_smp_switch(0);
return;
- current->state = TASK_UNINTERRUPTIBLE;
- schedule_timeout(HZ/10);
+ }
+ msleep(100);
}
printk(KERN_ERR "CPU %u didn't die...\n", cpu);
}
int __devinit __cpu_up(unsigned int cpu)
{
+#ifdef CONFIG_HOTPLUG_CPU
+ int ret=0;
+
+ /*
+ * We do warm boot only on cpus that had booted earlier
+ * Otherwise cold boot is all handled from smp_boot_cpus().
+ * cpu_callin_map is set during AP kickstart process. Its reset
+ * when a cpu is taken offline from cpu_exit_clear().
+ */
+ if (!cpu_isset(cpu, cpu_callin_map))
+ ret = __smp_prepare_cpu(cpu);
+
+ if (ret)
+ return -EIO;
+#endif
+
/* In case one didn't come up */
if (!cpu_isset(cpu, cpu_callin_map)) {
printk(KERN_DEBUG "skipping cpu%d, didn't come online\n", cpu);
return -EIO;
}
-#ifdef CONFIG_HOTPLUG_CPU
- /* Already up, and in cpu_quiescent now? */
- if (cpu_isset(cpu, smp_commenced_mask)) {
- cpu_enable(cpu);
- return 0;
- }
-#endif
-
local_irq_enable();
+ per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
/* Unleash the CPU! */
cpu_set(cpu, smp_commenced_mask);
while (!cpu_isset(cpu, cpu_online_map))
- mb();
+ cpu_relax();
return 0;
}
setup_ioapic_dest();
#endif
zap_low_mappings();
+#ifndef CONFIG_HOTPLUG_CPU
/*
* Disable executability of the SMP trampoline:
*/
set_kernel_exec((unsigned long)trampoline_base, trampoline_exec);
+#endif
}
void __init smp_intr_init(void)
/* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
}
+
+/*
+ * If the BIOS enumerates physical processors before logical,
+ * maxcpus=N at enumeration-time can be used to disable HT.
+ */
+static int __init parse_maxcpus(char *arg)
+{
+ extern unsigned int maxcpus;
+
+ maxcpus = simple_strtoul(arg, NULL, 0);
+ return 0;
+}
+early_param("maxcpus", parse_maxcpus);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff