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Diffstat (limited to 'arch/x86/kernel/smpboot.c')
-rw-r--r--arch/x86/kernel/smpboot.c199
1 files changed, 123 insertions, 76 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index febc6aabc72e..b1f3ed9c7a9e 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -68,8 +68,7 @@
#include <asm/mwait.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
-#include <asm/i387.h>
-#include <asm/fpu-internal.h>
+#include <asm/fpu/internal.h>
#include <asm/setup.h>
#include <asm/uv/uv.h>
#include <linux/mc146818rtc.h>
@@ -77,9 +76,6 @@
#include <asm/realmode.h>
#include <asm/misc.h>
-/* State of each CPU */
-DEFINE_PER_CPU(int, cpu_state) = { 0 };
-
/* Number of siblings per CPU package */
int smp_num_siblings = 1;
EXPORT_SYMBOL(smp_num_siblings);
@@ -175,11 +171,6 @@ static void smp_callin(void)
apic_ap_setup();
/*
- * Need to setup vector mappings before we enable interrupts.
- */
- setup_vector_irq(smp_processor_id());
-
- /*
* Save our processor parameters. Note: this information
* is needed for clock calibration.
*/
@@ -243,21 +234,16 @@ static void notrace start_secondary(void *unused)
check_tsc_sync_target();
/*
- * Enable the espfix hack for this CPU
- */
-#ifdef CONFIG_X86_ESPFIX64
- init_espfix_ap();
-#endif
-
- /*
- * We need to hold vector_lock so there the set of online cpus
- * does not change while we are assigning vectors to cpus. Holding
- * this lock ensures we don't half assign or remove an irq from a cpu.
+ * Lock vector_lock and initialize the vectors on this cpu
+ * before setting the cpu online. We must set it online with
+ * vector_lock held to prevent a concurrent setup/teardown
+ * from seeing a half valid vector space.
*/
lock_vector_lock();
+ setup_vector_irq(smp_processor_id());
set_cpu_online(smp_processor_id(), true);
unlock_vector_lock();
- per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
+ cpu_set_state_online(smp_processor_id());
x86_platform.nmi_init();
/* enable local interrupts */
@@ -317,10 +303,10 @@ topology_sane(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o, const char *name)
cpu1, name, cpu2, cpu_to_node(cpu1), cpu_to_node(cpu2));
}
-#define link_mask(_m, c1, c2) \
+#define link_mask(mfunc, c1, c2) \
do { \
- cpumask_set_cpu((c1), cpu_##_m##_mask(c2)); \
- cpumask_set_cpu((c2), cpu_##_m##_mask(c1)); \
+ cpumask_set_cpu((c1), mfunc(c2)); \
+ cpumask_set_cpu((c2), mfunc(c1)); \
} while (0)
static bool match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
@@ -401,9 +387,9 @@ void set_cpu_sibling_map(int cpu)
cpumask_set_cpu(cpu, cpu_sibling_setup_mask);
if (!has_mp) {
- cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
+ cpumask_set_cpu(cpu, topology_sibling_cpumask(cpu));
cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
- cpumask_set_cpu(cpu, cpu_core_mask(cpu));
+ cpumask_set_cpu(cpu, topology_core_cpumask(cpu));
c->booted_cores = 1;
return;
}
@@ -412,32 +398,34 @@ void set_cpu_sibling_map(int cpu)
o = &cpu_data(i);
if ((i == cpu) || (has_smt && match_smt(c, o)))
- link_mask(sibling, cpu, i);
+ link_mask(topology_sibling_cpumask, cpu, i);
if ((i == cpu) || (has_mp && match_llc(c, o)))
- link_mask(llc_shared, cpu, i);
+ link_mask(cpu_llc_shared_mask, cpu, i);
}
/*
* This needs a separate iteration over the cpus because we rely on all
- * cpu_sibling_mask links to be set-up.
+ * topology_sibling_cpumask links to be set-up.
*/
for_each_cpu(i, cpu_sibling_setup_mask) {
o = &cpu_data(i);
if ((i == cpu) || (has_mp && match_die(c, o))) {
- link_mask(core, cpu, i);
+ link_mask(topology_core_cpumask, cpu, i);
/*
* Does this new cpu bringup a new core?
*/
- if (cpumask_weight(cpu_sibling_mask(cpu)) == 1) {
+ if (cpumask_weight(
+ topology_sibling_cpumask(cpu)) == 1) {
/*
* for each core in package, increment
* the booted_cores for this new cpu
*/
- if (cpumask_first(cpu_sibling_mask(i)) == i)
+ if (cpumask_first(
+ topology_sibling_cpumask(i)) == i)
c->booted_cores++;
/*
* increment the core count for all
@@ -517,6 +505,40 @@ void __inquire_remote_apic(int apicid)
}
/*
+ * The Multiprocessor Specification 1.4 (1997) example code suggests
+ * that there should be a 10ms delay between the BSP asserting INIT
+ * and de-asserting INIT, when starting a remote processor.
+ * But that slows boot and resume on modern processors, which include
+ * many cores and don't require that delay.
+ *
+ * Cmdline "init_cpu_udelay=" is available to over-ride this delay.
+ * Modern processor families are quirked to remove the delay entirely.
+ */
+#define UDELAY_10MS_DEFAULT 10000
+
+static unsigned int init_udelay = UDELAY_10MS_DEFAULT;
+
+static int __init cpu_init_udelay(char *str)
+{
+ get_option(&str, &init_udelay);
+
+ return 0;
+}
+early_param("cpu_init_udelay", cpu_init_udelay);
+
+static void __init smp_quirk_init_udelay(void)
+{
+ /* if cmdline changed it from default, leave it alone */
+ if (init_udelay != UDELAY_10MS_DEFAULT)
+ return;
+
+ /* if modern processor, use no delay */
+ if (((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 == 6)) ||
+ ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && (boot_cpu_data.x86 >= 0xF)))
+ init_udelay = 0;
+}
+
+/*
* 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.
@@ -558,7 +580,7 @@ wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip)
static int
wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
{
- unsigned long send_status, accept_status = 0;
+ unsigned long send_status = 0, accept_status = 0;
int maxlvt, num_starts, j;
maxlvt = lapic_get_maxlvt();
@@ -586,7 +608,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
pr_debug("Waiting for send to finish...\n");
send_status = safe_apic_wait_icr_idle();
- mdelay(10);
+ udelay(init_udelay);
pr_debug("Deasserting INIT\n");
@@ -654,6 +676,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
+
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
apic_write(APIC_ESR, 0);
accept_status = (apic_read(APIC_ESR) & 0xEF);
@@ -779,6 +802,24 @@ out:
return boot_error;
}
+void common_cpu_up(unsigned int cpu, struct task_struct *idle)
+{
+ /* Just in case we booted with a single CPU. */
+ alternatives_enable_smp();
+
+ per_cpu(current_task, cpu) = idle;
+
+#ifdef CONFIG_X86_32
+ /* Stack for startup_32 can be just as for start_secondary onwards */
+ irq_ctx_init(cpu);
+ per_cpu(cpu_current_top_of_stack, cpu) =
+ (unsigned long)task_stack_page(idle) + THREAD_SIZE;
+#else
+ clear_tsk_thread_flag(idle, TIF_FORK);
+ initial_gs = per_cpu_offset(cpu);
+#endif
+}
+
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
* (ie clustered apic addressing mode), this is a LOGICAL apic ID.
@@ -796,27 +837,20 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
int cpu0_nmi_registered = 0;
unsigned long timeout;
- /* Just in case we booted with a single CPU. */
- alternatives_enable_smp();
-
idle->thread.sp = (unsigned long) (((struct pt_regs *)
(THREAD_SIZE + task_stack_page(idle))) - 1);
- per_cpu(current_task, cpu) = idle;
-#ifdef CONFIG_X86_32
- /* Stack for startup_32 can be just as for start_secondary onwards */
- irq_ctx_init(cpu);
-#else
- clear_tsk_thread_flag(idle, TIF_FORK);
- initial_gs = per_cpu_offset(cpu);
-#endif
- per_cpu(kernel_stack, cpu) =
- (unsigned long)task_stack_page(idle) -
- KERNEL_STACK_OFFSET + THREAD_SIZE;
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
initial_code = (unsigned long)start_secondary;
stack_start = idle->thread.sp;
+ /*
+ * Enable the espfix hack for this CPU
+ */
+#ifdef CONFIG_X86_ESPFIX64
+ init_espfix_ap(cpu);
+#endif
+
/* So we see what's up */
announce_cpu(cpu, apicid);
@@ -948,13 +982,27 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
*/
mtrr_save_state();
- per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
+ /* x86 CPUs take themselves offline, so delayed offline is OK. */
+ err = cpu_check_up_prepare(cpu);
+ if (err && err != -EBUSY)
+ return err;
/* the FPU context is blank, nobody can own it */
__cpu_disable_lazy_restore(cpu);
+ common_cpu_up(cpu, tidle);
+
+ /*
+ * We have to walk the irq descriptors to setup the vector
+ * space for the cpu which comes online. Prevent irq
+ * alloc/free across the bringup.
+ */
+ irq_lock_sparse();
+
err = do_boot_cpu(apicid, cpu, tidle);
+
if (err) {
+ irq_unlock_sparse();
pr_err("do_boot_cpu failed(%d) to wakeup CPU#%u\n", err, cpu);
return -EIO;
}
@@ -972,6 +1020,8 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
touch_nmi_watchdog();
}
+ irq_unlock_sparse();
+
return 0;
}
@@ -1001,8 +1051,8 @@ static __init void disable_smp(void)
physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
else
physid_set_mask_of_physid(0, &phys_cpu_present_map);
- cpumask_set_cpu(0, cpu_sibling_mask(0));
- cpumask_set_cpu(0, cpu_core_mask(0));
+ cpumask_set_cpu(0, topology_sibling_cpumask(0));
+ cpumask_set_cpu(0, topology_core_cpumask(0));
}
enum {
@@ -1086,8 +1136,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
return SMP_NO_APIC;
}
- verify_local_APIC();
-
/*
* If SMP should be disabled, then really disable it!
*/
@@ -1170,6 +1218,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
uv_system_init();
set_mtrr_aps_delayed_init();
+
+ smp_quirk_init_udelay();
}
void arch_enable_nonboot_cpus_begin(void)
@@ -1191,7 +1241,7 @@ void __init native_smp_prepare_boot_cpu(void)
switch_to_new_gdt(me);
/* already set me in cpu_online_mask in boot_cpu_init() */
cpumask_set_cpu(me, cpu_callout_mask);
- per_cpu(cpu_state, me) = CPU_ONLINE;
+ cpu_set_state_online(me);
}
void __init native_smp_cpus_done(unsigned int max_cpus)
@@ -1287,22 +1337,22 @@ static void remove_siblinginfo(int cpu)
int sibling;
struct cpuinfo_x86 *c = &cpu_data(cpu);
- for_each_cpu(sibling, cpu_core_mask(cpu)) {
- cpumask_clear_cpu(cpu, cpu_core_mask(sibling));
+ for_each_cpu(sibling, topology_core_cpumask(cpu)) {
+ cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
/*/
* last thread sibling in this cpu core going down
*/
- if (cpumask_weight(cpu_sibling_mask(cpu)) == 1)
+ if (cpumask_weight(topology_sibling_cpumask(cpu)) == 1)
cpu_data(sibling).booted_cores--;
}
- for_each_cpu(sibling, cpu_sibling_mask(cpu))
- cpumask_clear_cpu(cpu, cpu_sibling_mask(sibling));
+ for_each_cpu(sibling, topology_sibling_cpumask(cpu))
+ cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
for_each_cpu(sibling, cpu_llc_shared_mask(cpu))
cpumask_clear_cpu(cpu, cpu_llc_shared_mask(sibling));
cpumask_clear(cpu_llc_shared_mask(cpu));
- cpumask_clear(cpu_sibling_mask(cpu));
- cpumask_clear(cpu_core_mask(cpu));
+ cpumask_clear(topology_sibling_cpumask(cpu));
+ cpumask_clear(topology_core_cpumask(cpu));
c->phys_proc_id = 0;
c->cpu_core_id = 0;
cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
@@ -1318,14 +1368,10 @@ static void __ref remove_cpu_from_maps(int cpu)
numa_remove_cpu(cpu);
}
-static DEFINE_PER_CPU(struct completion, die_complete);
-
void cpu_disable_common(void)
{
int cpu = smp_processor_id();
- init_completion(&per_cpu(die_complete, smp_processor_id()));
-
remove_siblinginfo(cpu);
/* It's now safe to remove this processor from the online map */
@@ -1349,24 +1395,27 @@ int native_cpu_disable(void)
return 0;
}
-void cpu_die_common(unsigned int cpu)
+int common_cpu_die(unsigned int cpu)
{
- wait_for_completion_timeout(&per_cpu(die_complete, cpu), HZ);
-}
+ int ret = 0;
-void native_cpu_die(unsigned int cpu)
-{
/* We don't do anything here: idle task is faking death itself. */
- cpu_die_common(cpu);
-
/* They ack this in play_dead() by setting CPU_DEAD */
- if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
+ if (cpu_wait_death(cpu, 5)) {
if (system_state == SYSTEM_RUNNING)
pr_info("CPU %u is now offline\n", cpu);
} else {
pr_err("CPU %u didn't die...\n", cpu);
+ ret = -1;
}
+
+ return ret;
+}
+
+void native_cpu_die(unsigned int cpu)
+{
+ common_cpu_die(cpu);
}
void play_dead_common(void)
@@ -1375,10 +1424,8 @@ void play_dead_common(void)
reset_lazy_tlbstate();
amd_e400_remove_cpu(raw_smp_processor_id());
- mb();
/* Ack it */
- __this_cpu_write(cpu_state, CPU_DEAD);
- complete(&per_cpu(die_complete, smp_processor_id()));
+ (void)cpu_report_death();
/*
* With physical CPU hotplug, we should halt the cpu
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-03 21:36:05 +0000