@@ -48,8 +48,6 @@ struct smp_ops {
};
/* Globals due to paravirt */
-extern void set_cpu_sibling_map(int cpu);
-
#ifdef CONFIG_SMP
extern struct smp_ops smp_ops;
@@ -137,7 +135,7 @@ void native_send_call_func_single_ipi(int cpu);
void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
void smp_store_boot_cpu_info(void);
-void smp_store_cpu_info(int id);
+void smp_store_cpu_info(int id, bool force_single_core);
asmlinkage __visible void smp_reboot_interrupt(void);
__visible void smp_reschedule_interrupt(struct pt_regs *regs);
@@ -136,8 +136,6 @@ static inline int topology_max_smt_threads(void)
return __max_smt_threads;
}
-int topology_update_package_map(unsigned int apicid, unsigned int cpu);
-int topology_update_die_map(unsigned int dieid, unsigned int cpu);
int topology_phys_to_logical_pkg(unsigned int pkg);
int topology_phys_to_logical_die(unsigned int die, unsigned int cpu);
bool topology_is_primary_thread(unsigned int cpu);
@@ -1766,7 +1766,7 @@ static void generic_identify(struct cpuinfo_x86 *c)
* Validate that ACPI/mptables have the same information about the
* effective APIC id and update the package map.
*/
-static void validate_apic_and_package_id(struct cpuinfo_x86 *c)
+static void validate_apic_id(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
unsigned int apicid, cpu = smp_processor_id();
@@ -1777,8 +1777,6 @@ static void validate_apic_and_package_id(struct cpuinfo_x86 *c)
pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x APIC: %x\n",
cpu, apicid, c->initial_apicid);
}
- BUG_ON(topology_update_package_map(c->phys_proc_id, cpu));
- BUG_ON(topology_update_die_map(c->cpu_die_id, cpu));
#else
c->logical_proc_id = 0;
#endif
@@ -1969,7 +1967,7 @@ void identify_secondary_cpu(struct cpuinfo_x86 *c)
#ifdef CONFIG_X86_32
enable_sep_cpu();
#endif
- validate_apic_and_package_id(c);
+ validate_apic_id(c);
x86_spec_ctrl_setup_ap();
update_srbds_msr();
@@ -182,16 +182,12 @@ static void smp_callin(void)
apic_ap_setup();
/*
- * Save our processor parameters. Note: this information
- * is needed for clock calibration.
- */
- smp_store_cpu_info(cpuid);
-
- /*
+ * Save our processor parameters and update topology.
+ * Note: this information is needed for clock calibration.
* The topology information must be up to date before
* calibrate_delay() and notify_cpu_starting().
*/
- set_cpu_sibling_map(raw_smp_processor_id());
+ smp_store_cpu_info(cpuid, false);
ap_init_aperfmperf();
@@ -246,6 +242,12 @@ static void notrace start_secondary(void *unused)
* smp_callout_mask to release them.
*/
cpu_init_secondary();
+
+ /*
+ * Even though notify_cpu_starting() will do this, it does so too late
+ * as the AP may already have triggered lockdep splats by then. See
+ * commit 29368e093 ("x86/smpboot: Move rcu_cpu_starting() earlier").
+ */
rcu_cpu_starting(raw_smp_processor_id());
x86_cpuinit.early_percpu_clock_init();
@@ -354,7 +356,7 @@ EXPORT_SYMBOL(topology_phys_to_logical_die);
* @pkg: The physical package id as retrieved via CPUID
* @cpu: The cpu for which this is updated
*/
-int topology_update_package_map(unsigned int pkg, unsigned int cpu)
+static int topology_update_package_map(unsigned int pkg, unsigned int cpu)
{
int new;
@@ -377,7 +379,7 @@ int topology_update_package_map(unsigned int pkg, unsigned int cpu)
* @die: The die id as retrieved via CPUID
* @cpu: The cpu for which this is updated
*/
-int topology_update_die_map(unsigned int die, unsigned int cpu)
+static int topology_update_die_map(unsigned int die, unsigned int cpu)
{
int new;
@@ -408,25 +410,7 @@ void __init smp_store_boot_cpu_info(void)
c->initialized = true;
}
-/*
- * The bootstrap kernel entry code has set these up. Save them for
- * a given CPU
- */
-void smp_store_cpu_info(int id)
-{
- struct cpuinfo_x86 *c = &cpu_data(id);
-
- /* Copy boot_cpu_data only on the first bringup */
- if (!c->initialized)
- *c = boot_cpu_data;
- c->cpu_index = id;
- /*
- * During boot time, CPU0 has this setup already. Save the info when
- * bringing up AP or offlined CPU0.
- */
- identify_secondary_cpu(c);
- c->initialized = true;
-}
+static arch_spinlock_t topology_lock = __ARCH_SPIN_LOCK_UNLOCKED;
static bool
topology_same_node(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
@@ -632,7 +616,7 @@ static struct sched_domain_topology_level x86_topology[] = {
*/
static bool x86_has_numa_in_package;
-void set_cpu_sibling_map(int cpu)
+static void set_cpu_sibling_map(int cpu)
{
bool has_smt = smp_num_siblings > 1;
bool has_mp = has_smt || boot_cpu_data.x86_max_cores > 1;
@@ -711,6 +695,37 @@ void set_cpu_sibling_map(int cpu)
}
}
+/*
+ * The bootstrap kernel entry code has set these up. Save them for
+ * a given CPU
+ */
+void smp_store_cpu_info(int id, bool force_single_core)
+{
+ struct cpuinfo_x86 *c = &cpu_data(id);
+
+ /* Copy boot_cpu_data only on the first bringup */
+ if (!c->initialized)
+ *c = boot_cpu_data;
+ c->cpu_index = id;
+ /*
+ * During boot time, CPU0 has this setup already. Save the info when
+ * bringing up AP or offlined CPU0.
+ */
+ identify_secondary_cpu(c);
+
+ arch_spin_lock(&topology_lock);
+ BUG_ON(topology_update_package_map(c->phys_proc_id, id));
+ BUG_ON(topology_update_die_map(c->cpu_die_id, id));
+ c->initialized = true;
+
+ /* For Xen PV */
+ if (force_single_core)
+ c->x86_max_cores = 1;
+
+ set_cpu_sibling_map(id);
+ arch_spin_unlock(&topology_lock);
+}
+
/* maps the cpu to the sched domain representing multi-core */
const struct cpumask *cpu_coregroup_mask(int cpu)
{
@@ -71,9 +71,7 @@ static void cpu_bringup(void)
xen_enable_syscall();
}
cpu = smp_processor_id();
- smp_store_cpu_info(cpu);
- cpu_data(cpu).x86_max_cores = 1;
- set_cpu_sibling_map(cpu);
+ smp_store_cpu_info(cpu, true);
speculative_store_bypass_ht_init();