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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * SMP support for ppc.
- *
- * Written by Cort Dougan ([email protected]) borrowing a great
- * deal of code from the sparc and intel versions.
- *
- * Copyright (C) 1999 Cort Dougan <[email protected]>
- *
- * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and
- * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
- */
- #undef DEBUG
- #include <linux/kernel.h>
- #include <linux/export.h>
- #include <linux/sched/mm.h>
- #include <linux/sched/task_stack.h>
- #include <linux/sched/topology.h>
- #include <linux/smp.h>
- #include <linux/interrupt.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/spinlock.h>
- #include <linux/cache.h>
- #include <linux/err.h>
- #include <linux/device.h>
- #include <linux/cpu.h>
- #include <linux/notifier.h>
- #include <linux/topology.h>
- #include <linux/profile.h>
- #include <linux/processor.h>
- #include <linux/random.h>
- #include <linux/stackprotector.h>
- #include <linux/pgtable.h>
- #include <linux/clockchips.h>
- #include <linux/kexec.h>
- #include <asm/ptrace.h>
- #include <linux/atomic.h>
- #include <asm/irq.h>
- #include <asm/hw_irq.h>
- #include <asm/kvm_ppc.h>
- #include <asm/dbell.h>
- #include <asm/page.h>
- #include <asm/smp.h>
- #include <asm/time.h>
- #include <asm/machdep.h>
- #include <asm/cputhreads.h>
- #include <asm/cputable.h>
- #include <asm/mpic.h>
- #include <asm/vdso_datapage.h>
- #ifdef CONFIG_PPC64
- #include <asm/paca.h>
- #endif
- #include <asm/vdso.h>
- #include <asm/debug.h>
- #include <asm/cpu_has_feature.h>
- #include <asm/ftrace.h>
- #include <asm/kup.h>
- #include <asm/fadump.h>
- #ifdef DEBUG
- #include <asm/udbg.h>
- #define DBG(fmt...) udbg_printf(fmt)
- #else
- #define DBG(fmt...)
- #endif
- #ifdef CONFIG_HOTPLUG_CPU
- /* State of each CPU during hotplug phases */
- static DEFINE_PER_CPU(int, cpu_state) = { 0 };
- #endif
- struct task_struct *secondary_current;
- bool has_big_cores;
- bool coregroup_enabled;
- bool thread_group_shares_l2;
- bool thread_group_shares_l3;
- DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
- DEFINE_PER_CPU(cpumask_var_t, cpu_smallcore_map);
- DEFINE_PER_CPU(cpumask_var_t, cpu_l2_cache_map);
- DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
- static DEFINE_PER_CPU(cpumask_var_t, cpu_coregroup_map);
- EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
- EXPORT_PER_CPU_SYMBOL(cpu_l2_cache_map);
- EXPORT_PER_CPU_SYMBOL(cpu_core_map);
- EXPORT_SYMBOL_GPL(has_big_cores);
- enum {
- #ifdef CONFIG_SCHED_SMT
- smt_idx,
- #endif
- cache_idx,
- mc_idx,
- die_idx,
- };
- #define MAX_THREAD_LIST_SIZE 8
- #define THREAD_GROUP_SHARE_L1 1
- #define THREAD_GROUP_SHARE_L2_L3 2
- struct thread_groups {
- unsigned int property;
- unsigned int nr_groups;
- unsigned int threads_per_group;
- unsigned int thread_list[MAX_THREAD_LIST_SIZE];
- };
- /* Maximum number of properties that groups of threads within a core can share */
- #define MAX_THREAD_GROUP_PROPERTIES 2
- struct thread_groups_list {
- unsigned int nr_properties;
- struct thread_groups property_tgs[MAX_THREAD_GROUP_PROPERTIES];
- };
- static struct thread_groups_list tgl[NR_CPUS] __initdata;
- /*
- * On big-cores system, thread_group_l1_cache_map for each CPU corresponds to
- * the set its siblings that share the L1-cache.
- */
- DEFINE_PER_CPU(cpumask_var_t, thread_group_l1_cache_map);
- /*
- * On some big-cores system, thread_group_l2_cache_map for each CPU
- * corresponds to the set its siblings within the core that share the
- * L2-cache.
- */
- DEFINE_PER_CPU(cpumask_var_t, thread_group_l2_cache_map);
- /*
- * On P10, thread_group_l3_cache_map for each CPU is equal to the
- * thread_group_l2_cache_map
- */
- DEFINE_PER_CPU(cpumask_var_t, thread_group_l3_cache_map);
- /* SMP operations for this machine */
- struct smp_ops_t *smp_ops;
- /* Can't be static due to PowerMac hackery */
- volatile unsigned int cpu_callin_map[NR_CPUS];
- int smt_enabled_at_boot = 1;
- /*
- * Returns 1 if the specified cpu should be brought up during boot.
- * Used to inhibit booting threads if they've been disabled or
- * limited on the command line
- */
- int smp_generic_cpu_bootable(unsigned int nr)
- {
- /* Special case - we inhibit secondary thread startup
- * during boot if the user requests it.
- */
- if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT)) {
- if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0)
- return 0;
- if (smt_enabled_at_boot
- && cpu_thread_in_core(nr) >= smt_enabled_at_boot)
- return 0;
- }
- return 1;
- }
- #ifdef CONFIG_PPC64
- int smp_generic_kick_cpu(int nr)
- {
- if (nr < 0 || nr >= nr_cpu_ids)
- return -EINVAL;
- /*
- * The processor is currently spinning, waiting for the
- * cpu_start field to become non-zero After we set cpu_start,
- * the processor will continue on to secondary_start
- */
- if (!paca_ptrs[nr]->cpu_start) {
- paca_ptrs[nr]->cpu_start = 1;
- smp_mb();
- return 0;
- }
- #ifdef CONFIG_HOTPLUG_CPU
- /*
- * Ok it's not there, so it might be soft-unplugged, let's
- * try to bring it back
- */
- generic_set_cpu_up(nr);
- smp_wmb();
- smp_send_reschedule(nr);
- #endif /* CONFIG_HOTPLUG_CPU */
- return 0;
- }
- #endif /* CONFIG_PPC64 */
- static irqreturn_t call_function_action(int irq, void *data)
- {
- generic_smp_call_function_interrupt();
- return IRQ_HANDLED;
- }
- static irqreturn_t reschedule_action(int irq, void *data)
- {
- scheduler_ipi();
- return IRQ_HANDLED;
- }
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- static irqreturn_t tick_broadcast_ipi_action(int irq, void *data)
- {
- timer_broadcast_interrupt();
- return IRQ_HANDLED;
- }
- #endif
- #ifdef CONFIG_NMI_IPI
- static irqreturn_t nmi_ipi_action(int irq, void *data)
- {
- smp_handle_nmi_ipi(get_irq_regs());
- return IRQ_HANDLED;
- }
- #endif
- static irq_handler_t smp_ipi_action[] = {
- [PPC_MSG_CALL_FUNCTION] = call_function_action,
- [PPC_MSG_RESCHEDULE] = reschedule_action,
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- [PPC_MSG_TICK_BROADCAST] = tick_broadcast_ipi_action,
- #endif
- #ifdef CONFIG_NMI_IPI
- [PPC_MSG_NMI_IPI] = nmi_ipi_action,
- #endif
- };
- /*
- * The NMI IPI is a fallback and not truly non-maskable. It is simpler
- * than going through the call function infrastructure, and strongly
- * serialized, so it is more appropriate for debugging.
- */
- const char *smp_ipi_name[] = {
- [PPC_MSG_CALL_FUNCTION] = "ipi call function",
- [PPC_MSG_RESCHEDULE] = "ipi reschedule",
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- [PPC_MSG_TICK_BROADCAST] = "ipi tick-broadcast",
- #endif
- #ifdef CONFIG_NMI_IPI
- [PPC_MSG_NMI_IPI] = "nmi ipi",
- #endif
- };
- /* optional function to request ipi, for controllers with >= 4 ipis */
- int smp_request_message_ipi(int virq, int msg)
- {
- int err;
- if (msg < 0 || msg > PPC_MSG_NMI_IPI)
- return -EINVAL;
- #ifndef CONFIG_NMI_IPI
- if (msg == PPC_MSG_NMI_IPI)
- return 1;
- #endif
- err = request_irq(virq, smp_ipi_action[msg],
- IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND,
- smp_ipi_name[msg], NULL);
- WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
- virq, smp_ipi_name[msg], err);
- return err;
- }
- #ifdef CONFIG_PPC_SMP_MUXED_IPI
- struct cpu_messages {
- long messages; /* current messages */
- };
- static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message);
- void smp_muxed_ipi_set_message(int cpu, int msg)
- {
- struct cpu_messages *info = &per_cpu(ipi_message, cpu);
- char *message = (char *)&info->messages;
- /*
- * Order previous accesses before accesses in the IPI handler.
- */
- smp_mb();
- message[msg] = 1;
- }
- void smp_muxed_ipi_message_pass(int cpu, int msg)
- {
- smp_muxed_ipi_set_message(cpu, msg);
- /*
- * cause_ipi functions are required to include a full barrier
- * before doing whatever causes the IPI.
- */
- smp_ops->cause_ipi(cpu);
- }
- #ifdef __BIG_ENDIAN__
- #define IPI_MESSAGE(A) (1uL << ((BITS_PER_LONG - 8) - 8 * (A)))
- #else
- #define IPI_MESSAGE(A) (1uL << (8 * (A)))
- #endif
- irqreturn_t smp_ipi_demux(void)
- {
- mb(); /* order any irq clear */
- return smp_ipi_demux_relaxed();
- }
- /* sync-free variant. Callers should ensure synchronization */
- irqreturn_t smp_ipi_demux_relaxed(void)
- {
- struct cpu_messages *info;
- unsigned long all;
- info = this_cpu_ptr(&ipi_message);
- do {
- all = xchg(&info->messages, 0);
- #if defined(CONFIG_KVM_XICS) && defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE)
- /*
- * Must check for PPC_MSG_RM_HOST_ACTION messages
- * before PPC_MSG_CALL_FUNCTION messages because when
- * a VM is destroyed, we call kick_all_cpus_sync()
- * to ensure that any pending PPC_MSG_RM_HOST_ACTION
- * messages have completed before we free any VCPUs.
- */
- if (all & IPI_MESSAGE(PPC_MSG_RM_HOST_ACTION))
- kvmppc_xics_ipi_action();
- #endif
- if (all & IPI_MESSAGE(PPC_MSG_CALL_FUNCTION))
- generic_smp_call_function_interrupt();
- if (all & IPI_MESSAGE(PPC_MSG_RESCHEDULE))
- scheduler_ipi();
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- if (all & IPI_MESSAGE(PPC_MSG_TICK_BROADCAST))
- timer_broadcast_interrupt();
- #endif
- #ifdef CONFIG_NMI_IPI
- if (all & IPI_MESSAGE(PPC_MSG_NMI_IPI))
- nmi_ipi_action(0, NULL);
- #endif
- } while (info->messages);
- return IRQ_HANDLED;
- }
- #endif /* CONFIG_PPC_SMP_MUXED_IPI */
- static inline void do_message_pass(int cpu, int msg)
- {
- if (smp_ops->message_pass)
- smp_ops->message_pass(cpu, msg);
- #ifdef CONFIG_PPC_SMP_MUXED_IPI
- else
- smp_muxed_ipi_message_pass(cpu, msg);
- #endif
- }
- void smp_send_reschedule(int cpu)
- {
- if (likely(smp_ops))
- do_message_pass(cpu, PPC_MSG_RESCHEDULE);
- }
- EXPORT_SYMBOL_GPL(smp_send_reschedule);
- void arch_send_call_function_single_ipi(int cpu)
- {
- do_message_pass(cpu, PPC_MSG_CALL_FUNCTION);
- }
- void arch_send_call_function_ipi_mask(const struct cpumask *mask)
- {
- unsigned int cpu;
- for_each_cpu(cpu, mask)
- do_message_pass(cpu, PPC_MSG_CALL_FUNCTION);
- }
- #ifdef CONFIG_NMI_IPI
- /*
- * "NMI IPI" system.
- *
- * NMI IPIs may not be recoverable, so should not be used as ongoing part of
- * a running system. They can be used for crash, debug, halt/reboot, etc.
- *
- * The IPI call waits with interrupts disabled until all targets enter the
- * NMI handler, then returns. Subsequent IPIs can be issued before targets
- * have returned from their handlers, so there is no guarantee about
- * concurrency or re-entrancy.
- *
- * A new NMI can be issued before all targets exit the handler.
- *
- * The IPI call may time out without all targets entering the NMI handler.
- * In that case, there is some logic to recover (and ignore subsequent
- * NMI interrupts that may eventually be raised), but the platform interrupt
- * handler may not be able to distinguish this from other exception causes,
- * which may cause a crash.
- */
- static atomic_t __nmi_ipi_lock = ATOMIC_INIT(0);
- static struct cpumask nmi_ipi_pending_mask;
- static bool nmi_ipi_busy = false;
- static void (*nmi_ipi_function)(struct pt_regs *) = NULL;
- noinstr static void nmi_ipi_lock_start(unsigned long *flags)
- {
- raw_local_irq_save(*flags);
- hard_irq_disable();
- while (arch_atomic_cmpxchg(&__nmi_ipi_lock, 0, 1) == 1) {
- raw_local_irq_restore(*flags);
- spin_until_cond(arch_atomic_read(&__nmi_ipi_lock) == 0);
- raw_local_irq_save(*flags);
- hard_irq_disable();
- }
- }
- noinstr static void nmi_ipi_lock(void)
- {
- while (arch_atomic_cmpxchg(&__nmi_ipi_lock, 0, 1) == 1)
- spin_until_cond(arch_atomic_read(&__nmi_ipi_lock) == 0);
- }
- noinstr static void nmi_ipi_unlock(void)
- {
- smp_mb();
- WARN_ON(arch_atomic_read(&__nmi_ipi_lock) != 1);
- arch_atomic_set(&__nmi_ipi_lock, 0);
- }
- noinstr static void nmi_ipi_unlock_end(unsigned long *flags)
- {
- nmi_ipi_unlock();
- raw_local_irq_restore(*flags);
- }
- /*
- * Platform NMI handler calls this to ack
- */
- noinstr int smp_handle_nmi_ipi(struct pt_regs *regs)
- {
- void (*fn)(struct pt_regs *) = NULL;
- unsigned long flags;
- int me = raw_smp_processor_id();
- int ret = 0;
- /*
- * Unexpected NMIs are possible here because the interrupt may not
- * be able to distinguish NMI IPIs from other types of NMIs, or
- * because the caller may have timed out.
- */
- nmi_ipi_lock_start(&flags);
- if (cpumask_test_cpu(me, &nmi_ipi_pending_mask)) {
- cpumask_clear_cpu(me, &nmi_ipi_pending_mask);
- fn = READ_ONCE(nmi_ipi_function);
- WARN_ON_ONCE(!fn);
- ret = 1;
- }
- nmi_ipi_unlock_end(&flags);
- if (fn)
- fn(regs);
- return ret;
- }
- static void do_smp_send_nmi_ipi(int cpu, bool safe)
- {
- if (!safe && smp_ops->cause_nmi_ipi && smp_ops->cause_nmi_ipi(cpu))
- return;
- if (cpu >= 0) {
- do_message_pass(cpu, PPC_MSG_NMI_IPI);
- } else {
- int c;
- for_each_online_cpu(c) {
- if (c == raw_smp_processor_id())
- continue;
- do_message_pass(c, PPC_MSG_NMI_IPI);
- }
- }
- }
- /*
- * - cpu is the target CPU (must not be this CPU), or NMI_IPI_ALL_OTHERS.
- * - fn is the target callback function.
- * - delay_us > 0 is the delay before giving up waiting for targets to
- * begin executing the handler, == 0 specifies indefinite delay.
- */
- static int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *),
- u64 delay_us, bool safe)
- {
- unsigned long flags;
- int me = raw_smp_processor_id();
- int ret = 1;
- BUG_ON(cpu == me);
- BUG_ON(cpu < 0 && cpu != NMI_IPI_ALL_OTHERS);
- if (unlikely(!smp_ops))
- return 0;
- nmi_ipi_lock_start(&flags);
- while (nmi_ipi_busy) {
- nmi_ipi_unlock_end(&flags);
- spin_until_cond(!nmi_ipi_busy);
- nmi_ipi_lock_start(&flags);
- }
- nmi_ipi_busy = true;
- nmi_ipi_function = fn;
- WARN_ON_ONCE(!cpumask_empty(&nmi_ipi_pending_mask));
- if (cpu < 0) {
- /* ALL_OTHERS */
- cpumask_copy(&nmi_ipi_pending_mask, cpu_online_mask);
- cpumask_clear_cpu(me, &nmi_ipi_pending_mask);
- } else {
- cpumask_set_cpu(cpu, &nmi_ipi_pending_mask);
- }
- nmi_ipi_unlock();
- /* Interrupts remain hard disabled */
- do_smp_send_nmi_ipi(cpu, safe);
- nmi_ipi_lock();
- /* nmi_ipi_busy is set here, so unlock/lock is okay */
- while (!cpumask_empty(&nmi_ipi_pending_mask)) {
- nmi_ipi_unlock();
- udelay(1);
- nmi_ipi_lock();
- if (delay_us) {
- delay_us--;
- if (!delay_us)
- break;
- }
- }
- if (!cpumask_empty(&nmi_ipi_pending_mask)) {
- /* Timeout waiting for CPUs to call smp_handle_nmi_ipi */
- ret = 0;
- cpumask_clear(&nmi_ipi_pending_mask);
- }
- nmi_ipi_function = NULL;
- nmi_ipi_busy = false;
- nmi_ipi_unlock_end(&flags);
- return ret;
- }
- int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
- {
- return __smp_send_nmi_ipi(cpu, fn, delay_us, false);
- }
- int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
- {
- return __smp_send_nmi_ipi(cpu, fn, delay_us, true);
- }
- #endif /* CONFIG_NMI_IPI */
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- void tick_broadcast(const struct cpumask *mask)
- {
- unsigned int cpu;
- for_each_cpu(cpu, mask)
- do_message_pass(cpu, PPC_MSG_TICK_BROADCAST);
- }
- #endif
- #ifdef CONFIG_DEBUGGER
- static void debugger_ipi_callback(struct pt_regs *regs)
- {
- debugger_ipi(regs);
- }
- void smp_send_debugger_break(void)
- {
- smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, debugger_ipi_callback, 1000000);
- }
- #endif
- #ifdef CONFIG_KEXEC_CORE
- void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
- {
- int cpu;
- smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, crash_ipi_callback, 1000000);
- if (kdump_in_progress() && crash_wake_offline) {
- for_each_present_cpu(cpu) {
- if (cpu_online(cpu))
- continue;
- /*
- * crash_ipi_callback will wait for
- * all cpus, including offline CPUs.
- * We don't care about nmi_ipi_function.
- * Offline cpus will jump straight into
- * crash_ipi_callback, we can skip the
- * entire NMI dance and waiting for
- * cpus to clear pending mask, etc.
- */
- do_smp_send_nmi_ipi(cpu, false);
- }
- }
- }
- #endif
- void crash_smp_send_stop(void)
- {
- static bool stopped = false;
- /*
- * In case of fadump, register data for all CPUs is captured by f/w
- * on ibm,os-term rtas call. Skip IPI callbacks to other CPUs before
- * this rtas call to avoid tricky post processing of those CPUs'
- * backtraces.
- */
- if (should_fadump_crash())
- return;
- if (stopped)
- return;
- stopped = true;
- #ifdef CONFIG_KEXEC_CORE
- if (kexec_crash_image) {
- crash_kexec_prepare();
- return;
- }
- #endif
- smp_send_stop();
- }
- #ifdef CONFIG_NMI_IPI
- static void nmi_stop_this_cpu(struct pt_regs *regs)
- {
- /*
- * IRQs are already hard disabled by the smp_handle_nmi_ipi.
- */
- set_cpu_online(smp_processor_id(), false);
- spin_begin();
- while (1)
- spin_cpu_relax();
- }
- void smp_send_stop(void)
- {
- smp_send_nmi_ipi(NMI_IPI_ALL_OTHERS, nmi_stop_this_cpu, 1000000);
- }
- #else /* CONFIG_NMI_IPI */
- static void stop_this_cpu(void *dummy)
- {
- hard_irq_disable();
- /*
- * Offlining CPUs in stop_this_cpu can result in scheduler warnings,
- * (see commit de6e5d38417e), but printk_safe_flush_on_panic() wants
- * to know other CPUs are offline before it breaks locks to flush
- * printk buffers, in case we panic()ed while holding the lock.
- */
- set_cpu_online(smp_processor_id(), false);
- spin_begin();
- while (1)
- spin_cpu_relax();
- }
- void smp_send_stop(void)
- {
- static bool stopped = false;
- /*
- * Prevent waiting on csd lock from a previous smp_send_stop.
- * This is racy, but in general callers try to do the right
- * thing and only fire off one smp_send_stop (e.g., see
- * kernel/panic.c)
- */
- if (stopped)
- return;
- stopped = true;
- smp_call_function(stop_this_cpu, NULL, 0);
- }
- #endif /* CONFIG_NMI_IPI */
- static struct task_struct *current_set[NR_CPUS];
- static void smp_store_cpu_info(int id)
- {
- per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
- #ifdef CONFIG_PPC_E500
- per_cpu(next_tlbcam_idx, id)
- = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
- #endif
- }
- /*
- * Relationships between CPUs are maintained in a set of per-cpu cpumasks so
- * rather than just passing around the cpumask we pass around a function that
- * returns the that cpumask for the given CPU.
- */
- static void set_cpus_related(int i, int j, struct cpumask *(*get_cpumask)(int))
- {
- cpumask_set_cpu(i, get_cpumask(j));
- cpumask_set_cpu(j, get_cpumask(i));
- }
- #ifdef CONFIG_HOTPLUG_CPU
- static void set_cpus_unrelated(int i, int j,
- struct cpumask *(*get_cpumask)(int))
- {
- cpumask_clear_cpu(i, get_cpumask(j));
- cpumask_clear_cpu(j, get_cpumask(i));
- }
- #endif
- /*
- * Extends set_cpus_related. Instead of setting one CPU at a time in
- * dstmask, set srcmask at oneshot. dstmask should be super set of srcmask.
- */
- static void or_cpumasks_related(int i, int j, struct cpumask *(*srcmask)(int),
- struct cpumask *(*dstmask)(int))
- {
- struct cpumask *mask;
- int k;
- mask = srcmask(j);
- for_each_cpu(k, srcmask(i))
- cpumask_or(dstmask(k), dstmask(k), mask);
- if (i == j)
- return;
- mask = srcmask(i);
- for_each_cpu(k, srcmask(j))
- cpumask_or(dstmask(k), dstmask(k), mask);
- }
- /*
- * parse_thread_groups: Parses the "ibm,thread-groups" device tree
- * property for the CPU device node @dn and stores
- * the parsed output in the thread_groups_list
- * structure @tglp.
- *
- * @dn: The device node of the CPU device.
- * @tglp: Pointer to a thread group list structure into which the parsed
- * output of "ibm,thread-groups" is stored.
- *
- * ibm,thread-groups[0..N-1] array defines which group of threads in
- * the CPU-device node can be grouped together based on the property.
- *
- * This array can represent thread groupings for multiple properties.
- *
- * ibm,thread-groups[i + 0] tells us the property based on which the
- * threads are being grouped together. If this value is 1, it implies
- * that the threads in the same group share L1, translation cache. If
- * the value is 2, it implies that the threads in the same group share
- * the same L2 cache.
- *
- * ibm,thread-groups[i+1] tells us how many such thread groups exist for the
- * property ibm,thread-groups[i]
- *
- * ibm,thread-groups[i+2] tells us the number of threads in each such
- * group.
- * Suppose k = (ibm,thread-groups[i+1] * ibm,thread-groups[i+2]), then,
- *
- * ibm,thread-groups[i+3..i+k+2] (is the list of threads identified by
- * "ibm,ppc-interrupt-server#s" arranged as per their membership in
- * the grouping.
- *
- * Example:
- * If "ibm,thread-groups" = [1,2,4,8,10,12,14,9,11,13,15,2,2,4,8,10,12,14,9,11,13,15]
- * This can be decomposed up into two consecutive arrays:
- * a) [1,2,4,8,10,12,14,9,11,13,15]
- * b) [2,2,4,8,10,12,14,9,11,13,15]
- *
- * where in,
- *
- * a) provides information of Property "1" being shared by "2" groups,
- * each with "4" threads each. The "ibm,ppc-interrupt-server#s" of
- * the first group is {8,10,12,14} and the
- * "ibm,ppc-interrupt-server#s" of the second group is
- * {9,11,13,15}. Property "1" is indicative of the thread in the
- * group sharing L1 cache, translation cache and Instruction Data
- * flow.
- *
- * b) provides information of Property "2" being shared by "2" groups,
- * each group with "4" threads. The "ibm,ppc-interrupt-server#s" of
- * the first group is {8,10,12,14} and the
- * "ibm,ppc-interrupt-server#s" of the second group is
- * {9,11,13,15}. Property "2" indicates that the threads in each
- * group share the L2-cache.
- *
- * Returns 0 on success, -EINVAL if the property does not exist,
- * -ENODATA if property does not have a value, and -EOVERFLOW if the
- * property data isn't large enough.
- */
- static int parse_thread_groups(struct device_node *dn,
- struct thread_groups_list *tglp)
- {
- unsigned int property_idx = 0;
- u32 *thread_group_array;
- size_t total_threads;
- int ret = 0, count;
- u32 *thread_list;
- int i = 0;
- count = of_property_count_u32_elems(dn, "ibm,thread-groups");
- thread_group_array = kcalloc(count, sizeof(u32), GFP_KERNEL);
- ret = of_property_read_u32_array(dn, "ibm,thread-groups",
- thread_group_array, count);
- if (ret)
- goto out_free;
- while (i < count && property_idx < MAX_THREAD_GROUP_PROPERTIES) {
- int j;
- struct thread_groups *tg = &tglp->property_tgs[property_idx++];
- tg->property = thread_group_array[i];
- tg->nr_groups = thread_group_array[i + 1];
- tg->threads_per_group = thread_group_array[i + 2];
- total_threads = tg->nr_groups * tg->threads_per_group;
- thread_list = &thread_group_array[i + 3];
- for (j = 0; j < total_threads; j++)
- tg->thread_list[j] = thread_list[j];
- i = i + 3 + total_threads;
- }
- tglp->nr_properties = property_idx;
- out_free:
- kfree(thread_group_array);
- return ret;
- }
- /*
- * get_cpu_thread_group_start : Searches the thread group in tg->thread_list
- * that @cpu belongs to.
- *
- * @cpu : The logical CPU whose thread group is being searched.
- * @tg : The thread-group structure of the CPU node which @cpu belongs
- * to.
- *
- * Returns the index to tg->thread_list that points to the start
- * of the thread_group that @cpu belongs to.
- *
- * Returns -1 if cpu doesn't belong to any of the groups pointed to by
- * tg->thread_list.
- */
- static int get_cpu_thread_group_start(int cpu, struct thread_groups *tg)
- {
- int hw_cpu_id = get_hard_smp_processor_id(cpu);
- int i, j;
- for (i = 0; i < tg->nr_groups; i++) {
- int group_start = i * tg->threads_per_group;
- for (j = 0; j < tg->threads_per_group; j++) {
- int idx = group_start + j;
- if (tg->thread_list[idx] == hw_cpu_id)
- return group_start;
- }
- }
- return -1;
- }
- static struct thread_groups *__init get_thread_groups(int cpu,
- int group_property,
- int *err)
- {
- struct device_node *dn = of_get_cpu_node(cpu, NULL);
- struct thread_groups_list *cpu_tgl = &tgl[cpu];
- struct thread_groups *tg = NULL;
- int i;
- *err = 0;
- if (!dn) {
- *err = -ENODATA;
- return NULL;
- }
- if (!cpu_tgl->nr_properties) {
- *err = parse_thread_groups(dn, cpu_tgl);
- if (*err)
- goto out;
- }
- for (i = 0; i < cpu_tgl->nr_properties; i++) {
- if (cpu_tgl->property_tgs[i].property == group_property) {
- tg = &cpu_tgl->property_tgs[i];
- break;
- }
- }
- if (!tg)
- *err = -EINVAL;
- out:
- of_node_put(dn);
- return tg;
- }
- static int __init update_mask_from_threadgroup(cpumask_var_t *mask, struct thread_groups *tg,
- int cpu, int cpu_group_start)
- {
- int first_thread = cpu_first_thread_sibling(cpu);
- int i;
- zalloc_cpumask_var_node(mask, GFP_KERNEL, cpu_to_node(cpu));
- for (i = first_thread; i < first_thread + threads_per_core; i++) {
- int i_group_start = get_cpu_thread_group_start(i, tg);
- if (unlikely(i_group_start == -1)) {
- WARN_ON_ONCE(1);
- return -ENODATA;
- }
- if (i_group_start == cpu_group_start)
- cpumask_set_cpu(i, *mask);
- }
- return 0;
- }
- static int __init init_thread_group_cache_map(int cpu, int cache_property)
- {
- int cpu_group_start = -1, err = 0;
- struct thread_groups *tg = NULL;
- cpumask_var_t *mask = NULL;
- if (cache_property != THREAD_GROUP_SHARE_L1 &&
- cache_property != THREAD_GROUP_SHARE_L2_L3)
- return -EINVAL;
- tg = get_thread_groups(cpu, cache_property, &err);
- if (!tg)
- return err;
- cpu_group_start = get_cpu_thread_group_start(cpu, tg);
- if (unlikely(cpu_group_start == -1)) {
- WARN_ON_ONCE(1);
- return -ENODATA;
- }
- if (cache_property == THREAD_GROUP_SHARE_L1) {
- mask = &per_cpu(thread_group_l1_cache_map, cpu);
- update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start);
- }
- else if (cache_property == THREAD_GROUP_SHARE_L2_L3) {
- mask = &per_cpu(thread_group_l2_cache_map, cpu);
- update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start);
- mask = &per_cpu(thread_group_l3_cache_map, cpu);
- update_mask_from_threadgroup(mask, tg, cpu, cpu_group_start);
- }
- return 0;
- }
- static bool shared_caches;
- #ifdef CONFIG_SCHED_SMT
- /* cpumask of CPUs with asymmetric SMT dependency */
- static int powerpc_smt_flags(void)
- {
- int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
- if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
- printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
- flags |= SD_ASYM_PACKING;
- }
- return flags;
- }
- #endif
- /*
- * P9 has a slightly odd architecture where pairs of cores share an L2 cache.
- * This topology makes it *much* cheaper to migrate tasks between adjacent cores
- * since the migrated task remains cache hot. We want to take advantage of this
- * at the scheduler level so an extra topology level is required.
- */
- static int powerpc_shared_cache_flags(void)
- {
- return SD_SHARE_PKG_RESOURCES;
- }
- /*
- * We can't just pass cpu_l2_cache_mask() directly because
- * returns a non-const pointer and the compiler barfs on that.
- */
- static const struct cpumask *shared_cache_mask(int cpu)
- {
- return per_cpu(cpu_l2_cache_map, cpu);
- }
- #ifdef CONFIG_SCHED_SMT
- static const struct cpumask *smallcore_smt_mask(int cpu)
- {
- return cpu_smallcore_mask(cpu);
- }
- #endif
- static struct cpumask *cpu_coregroup_mask(int cpu)
- {
- return per_cpu(cpu_coregroup_map, cpu);
- }
- static bool has_coregroup_support(void)
- {
- return coregroup_enabled;
- }
- static const struct cpumask *cpu_mc_mask(int cpu)
- {
- return cpu_coregroup_mask(cpu);
- }
- static struct sched_domain_topology_level powerpc_topology[] = {
- #ifdef CONFIG_SCHED_SMT
- { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
- #endif
- { shared_cache_mask, powerpc_shared_cache_flags, SD_INIT_NAME(CACHE) },
- { cpu_mc_mask, SD_INIT_NAME(MC) },
- { cpu_cpu_mask, SD_INIT_NAME(DIE) },
- { NULL, },
- };
- static int __init init_big_cores(void)
- {
- int cpu;
- for_each_possible_cpu(cpu) {
- int err = init_thread_group_cache_map(cpu, THREAD_GROUP_SHARE_L1);
- if (err)
- return err;
- zalloc_cpumask_var_node(&per_cpu(cpu_smallcore_map, cpu),
- GFP_KERNEL,
- cpu_to_node(cpu));
- }
- has_big_cores = true;
- for_each_possible_cpu(cpu) {
- int err = init_thread_group_cache_map(cpu, THREAD_GROUP_SHARE_L2_L3);
- if (err)
- return err;
- }
- thread_group_shares_l2 = true;
- thread_group_shares_l3 = true;
- pr_debug("L2/L3 cache only shared by the threads in the small core\n");
- return 0;
- }
- void __init smp_prepare_cpus(unsigned int max_cpus)
- {
- unsigned int cpu;
- DBG("smp_prepare_cpus\n");
- /*
- * setup_cpu may need to be called on the boot cpu. We haven't
- * spun any cpus up but lets be paranoid.
- */
- BUG_ON(boot_cpuid != smp_processor_id());
- /* Fixup boot cpu */
- smp_store_cpu_info(boot_cpuid);
- cpu_callin_map[boot_cpuid] = 1;
- for_each_possible_cpu(cpu) {
- zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu),
- GFP_KERNEL, cpu_to_node(cpu));
- zalloc_cpumask_var_node(&per_cpu(cpu_l2_cache_map, cpu),
- GFP_KERNEL, cpu_to_node(cpu));
- zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu),
- GFP_KERNEL, cpu_to_node(cpu));
- if (has_coregroup_support())
- zalloc_cpumask_var_node(&per_cpu(cpu_coregroup_map, cpu),
- GFP_KERNEL, cpu_to_node(cpu));
- #ifdef CONFIG_NUMA
- /*
- * numa_node_id() works after this.
- */
- if (cpu_present(cpu)) {
- set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]);
- set_cpu_numa_mem(cpu,
- local_memory_node(numa_cpu_lookup_table[cpu]));
- }
- #endif
- }
- /* Init the cpumasks so the boot CPU is related to itself */
- cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
- cpumask_set_cpu(boot_cpuid, cpu_l2_cache_mask(boot_cpuid));
- cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));
- if (has_coregroup_support())
- cpumask_set_cpu(boot_cpuid, cpu_coregroup_mask(boot_cpuid));
- init_big_cores();
- if (has_big_cores) {
- cpumask_set_cpu(boot_cpuid,
- cpu_smallcore_mask(boot_cpuid));
- }
- if (cpu_to_chip_id(boot_cpuid) != -1) {
- int idx = DIV_ROUND_UP(num_possible_cpus(), threads_per_core);
- /*
- * All threads of a core will all belong to the same core,
- * chip_id_lookup_table will have one entry per core.
- * Assumption: if boot_cpuid doesn't have a chip-id, then no
- * other CPUs, will also not have chip-id.
- */
- chip_id_lookup_table = kcalloc(idx, sizeof(int), GFP_KERNEL);
- if (chip_id_lookup_table)
- memset(chip_id_lookup_table, -1, sizeof(int) * idx);
- }
- if (smp_ops && smp_ops->probe)
- smp_ops->probe();
- }
- void smp_prepare_boot_cpu(void)
- {
- BUG_ON(smp_processor_id() != boot_cpuid);
- #ifdef CONFIG_PPC64
- paca_ptrs[boot_cpuid]->__current = current;
- #endif
- set_numa_node(numa_cpu_lookup_table[boot_cpuid]);
- current_set[boot_cpuid] = current;
- }
- #ifdef CONFIG_HOTPLUG_CPU
- int generic_cpu_disable(void)
- {
- unsigned int cpu = smp_processor_id();
- if (cpu == boot_cpuid)
- return -EBUSY;
- set_cpu_online(cpu, false);
- #ifdef CONFIG_PPC64
- vdso_data->processorCount--;
- #endif
- /* Update affinity of all IRQs previously aimed at this CPU */
- irq_migrate_all_off_this_cpu();
- /*
- * Depending on the details of the interrupt controller, it's possible
- * that one of the interrupts we just migrated away from this CPU is
- * actually already pending on this CPU. If we leave it in that state
- * the interrupt will never be EOI'ed, and will never fire again. So
- * temporarily enable interrupts here, to allow any pending interrupt to
- * be received (and EOI'ed), before we take this CPU offline.
- */
- local_irq_enable();
- mdelay(1);
- local_irq_disable();
- return 0;
- }
- void generic_cpu_die(unsigned int cpu)
- {
- int i;
- for (i = 0; i < 100; i++) {
- smp_rmb();
- if (is_cpu_dead(cpu))
- return;
- msleep(100);
- }
- printk(KERN_ERR "CPU%d didn't die...\n", cpu);
- }
- void generic_set_cpu_dead(unsigned int cpu)
- {
- per_cpu(cpu_state, cpu) = CPU_DEAD;
- }
- /*
- * The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise
- * the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(),
- * which makes the delay in generic_cpu_die() not happen.
- */
- void generic_set_cpu_up(unsigned int cpu)
- {
- per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
- }
- int generic_check_cpu_restart(unsigned int cpu)
- {
- return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
- }
- int is_cpu_dead(unsigned int cpu)
- {
- return per_cpu(cpu_state, cpu) == CPU_DEAD;
- }
- static bool secondaries_inhibited(void)
- {
- return kvm_hv_mode_active();
- }
- #else /* HOTPLUG_CPU */
- #define secondaries_inhibited() 0
- #endif
- static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
- {
- #ifdef CONFIG_PPC64
- paca_ptrs[cpu]->__current = idle;
- paca_ptrs[cpu]->kstack = (unsigned long)task_stack_page(idle) +
- THREAD_SIZE - STACK_FRAME_OVERHEAD;
- #endif
- task_thread_info(idle)->cpu = cpu;
- secondary_current = current_set[cpu] = idle;
- }
- int __cpu_up(unsigned int cpu, struct task_struct *tidle)
- {
- const unsigned long boot_spin_ms = 5 * MSEC_PER_SEC;
- const bool booting = system_state < SYSTEM_RUNNING;
- const unsigned long hp_spin_ms = 1;
- unsigned long deadline;
- int rc;
- const unsigned long spin_wait_ms = booting ? boot_spin_ms : hp_spin_ms;
- /*
- * Don't allow secondary threads to come online if inhibited
- */
- if (threads_per_core > 1 && secondaries_inhibited() &&
- cpu_thread_in_subcore(cpu))
- return -EBUSY;
- if (smp_ops == NULL ||
- (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
- return -EINVAL;
- cpu_idle_thread_init(cpu, tidle);
- /*
- * The platform might need to allocate resources prior to bringing
- * up the CPU
- */
- if (smp_ops->prepare_cpu) {
- rc = smp_ops->prepare_cpu(cpu);
- if (rc)
- return rc;
- }
- /* Make sure callin-map entry is 0 (can be leftover a CPU
- * hotplug
- */
- cpu_callin_map[cpu] = 0;
- /* The information for processor bringup must
- * be written out to main store before we release
- * the processor.
- */
- smp_mb();
- /* wake up cpus */
- DBG("smp: kicking cpu %d\n", cpu);
- rc = smp_ops->kick_cpu(cpu);
- if (rc) {
- pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
- return rc;
- }
- /*
- * At boot time, simply spin on the callin word until the
- * deadline passes.
- *
- * At run time, spin for an optimistic amount of time to avoid
- * sleeping in the common case.
- */
- deadline = jiffies + msecs_to_jiffies(spin_wait_ms);
- spin_until_cond(cpu_callin_map[cpu] || time_is_before_jiffies(deadline));
- if (!cpu_callin_map[cpu] && system_state >= SYSTEM_RUNNING) {
- const unsigned long sleep_interval_us = 10 * USEC_PER_MSEC;
- const unsigned long sleep_wait_ms = 100 * MSEC_PER_SEC;
- deadline = jiffies + msecs_to_jiffies(sleep_wait_ms);
- while (!cpu_callin_map[cpu] && time_is_after_jiffies(deadline))
- fsleep(sleep_interval_us);
- }
- if (!cpu_callin_map[cpu]) {
- printk(KERN_ERR "Processor %u is stuck.\n", cpu);
- return -ENOENT;
- }
- DBG("Processor %u found.\n", cpu);
- if (smp_ops->give_timebase)
- smp_ops->give_timebase();
- /* Wait until cpu puts itself in the online & active maps */
- spin_until_cond(cpu_online(cpu));
- return 0;
- }
- /* Return the value of the reg property corresponding to the given
- * logical cpu.
- */
- int cpu_to_core_id(int cpu)
- {
- struct device_node *np;
- int id = -1;
- np = of_get_cpu_node(cpu, NULL);
- if (!np)
- goto out;
- id = of_get_cpu_hwid(np, 0);
- out:
- of_node_put(np);
- return id;
- }
- EXPORT_SYMBOL_GPL(cpu_to_core_id);
- /* Helper routines for cpu to core mapping */
- int cpu_core_index_of_thread(int cpu)
- {
- return cpu >> threads_shift;
- }
- EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);
- int cpu_first_thread_of_core(int core)
- {
- return core << threads_shift;
- }
- EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);
- /* Must be called when no change can occur to cpu_present_mask,
- * i.e. during cpu online or offline.
- */
- static struct device_node *cpu_to_l2cache(int cpu)
- {
- struct device_node *np;
- struct device_node *cache;
- if (!cpu_present(cpu))
- return NULL;
- np = of_get_cpu_node(cpu, NULL);
- if (np == NULL)
- return NULL;
- cache = of_find_next_cache_node(np);
- of_node_put(np);
- return cache;
- }
- static bool update_mask_by_l2(int cpu, cpumask_var_t *mask)
- {
- struct cpumask *(*submask_fn)(int) = cpu_sibling_mask;
- struct device_node *l2_cache, *np;
- int i;
- if (has_big_cores)
- submask_fn = cpu_smallcore_mask;
- /*
- * If the threads in a thread-group share L2 cache, then the
- * L2-mask can be obtained from thread_group_l2_cache_map.
- */
- if (thread_group_shares_l2) {
- cpumask_set_cpu(cpu, cpu_l2_cache_mask(cpu));
- for_each_cpu(i, per_cpu(thread_group_l2_cache_map, cpu)) {
- if (cpu_online(i))
- set_cpus_related(i, cpu, cpu_l2_cache_mask);
- }
- /* Verify that L1-cache siblings are a subset of L2 cache-siblings */
- if (!cpumask_equal(submask_fn(cpu), cpu_l2_cache_mask(cpu)) &&
- !cpumask_subset(submask_fn(cpu), cpu_l2_cache_mask(cpu))) {
- pr_warn_once("CPU %d : Inconsistent L1 and L2 cache siblings\n",
- cpu);
- }
- return true;
- }
- l2_cache = cpu_to_l2cache(cpu);
- if (!l2_cache || !*mask) {
- /* Assume only core siblings share cache with this CPU */
- for_each_cpu(i, cpu_sibling_mask(cpu))
- set_cpus_related(cpu, i, cpu_l2_cache_mask);
- return false;
- }
- cpumask_and(*mask, cpu_online_mask, cpu_cpu_mask(cpu));
- /* Update l2-cache mask with all the CPUs that are part of submask */
- or_cpumasks_related(cpu, cpu, submask_fn, cpu_l2_cache_mask);
- /* Skip all CPUs already part of current CPU l2-cache mask */
- cpumask_andnot(*mask, *mask, cpu_l2_cache_mask(cpu));
- for_each_cpu(i, *mask) {
- /*
- * when updating the marks the current CPU has not been marked
- * online, but we need to update the cache masks
- */
- np = cpu_to_l2cache(i);
- /* Skip all CPUs already part of current CPU l2-cache */
- if (np == l2_cache) {
- or_cpumasks_related(cpu, i, submask_fn, cpu_l2_cache_mask);
- cpumask_andnot(*mask, *mask, submask_fn(i));
- } else {
- cpumask_andnot(*mask, *mask, cpu_l2_cache_mask(i));
- }
- of_node_put(np);
- }
- of_node_put(l2_cache);
- return true;
- }
- #ifdef CONFIG_HOTPLUG_CPU
- static void remove_cpu_from_masks(int cpu)
- {
- struct cpumask *(*mask_fn)(int) = cpu_sibling_mask;
- int i;
- unmap_cpu_from_node(cpu);
- if (shared_caches)
- mask_fn = cpu_l2_cache_mask;
- for_each_cpu(i, mask_fn(cpu)) {
- set_cpus_unrelated(cpu, i, cpu_l2_cache_mask);
- set_cpus_unrelated(cpu, i, cpu_sibling_mask);
- if (has_big_cores)
- set_cpus_unrelated(cpu, i, cpu_smallcore_mask);
- }
- for_each_cpu(i, cpu_core_mask(cpu))
- set_cpus_unrelated(cpu, i, cpu_core_mask);
- if (has_coregroup_support()) {
- for_each_cpu(i, cpu_coregroup_mask(cpu))
- set_cpus_unrelated(cpu, i, cpu_coregroup_mask);
- }
- }
- #endif
- static inline void add_cpu_to_smallcore_masks(int cpu)
- {
- int i;
- if (!has_big_cores)
- return;
- cpumask_set_cpu(cpu, cpu_smallcore_mask(cpu));
- for_each_cpu(i, per_cpu(thread_group_l1_cache_map, cpu)) {
- if (cpu_online(i))
- set_cpus_related(i, cpu, cpu_smallcore_mask);
- }
- }
- static void update_coregroup_mask(int cpu, cpumask_var_t *mask)
- {
- struct cpumask *(*submask_fn)(int) = cpu_sibling_mask;
- int coregroup_id = cpu_to_coregroup_id(cpu);
- int i;
- if (shared_caches)
- submask_fn = cpu_l2_cache_mask;
- if (!*mask) {
- /* Assume only siblings are part of this CPU's coregroup */
- for_each_cpu(i, submask_fn(cpu))
- set_cpus_related(cpu, i, cpu_coregroup_mask);
- return;
- }
- cpumask_and(*mask, cpu_online_mask, cpu_cpu_mask(cpu));
- /* Update coregroup mask with all the CPUs that are part of submask */
- or_cpumasks_related(cpu, cpu, submask_fn, cpu_coregroup_mask);
- /* Skip all CPUs already part of coregroup mask */
- cpumask_andnot(*mask, *mask, cpu_coregroup_mask(cpu));
- for_each_cpu(i, *mask) {
- /* Skip all CPUs not part of this coregroup */
- if (coregroup_id == cpu_to_coregroup_id(i)) {
- or_cpumasks_related(cpu, i, submask_fn, cpu_coregroup_mask);
- cpumask_andnot(*mask, *mask, submask_fn(i));
- } else {
- cpumask_andnot(*mask, *mask, cpu_coregroup_mask(i));
- }
- }
- }
- static void add_cpu_to_masks(int cpu)
- {
- struct cpumask *(*submask_fn)(int) = cpu_sibling_mask;
- int first_thread = cpu_first_thread_sibling(cpu);
- cpumask_var_t mask;
- int chip_id = -1;
- bool ret;
- int i;
- /*
- * This CPU will not be in the online mask yet so we need to manually
- * add it to it's own thread sibling mask.
- */
- map_cpu_to_node(cpu, cpu_to_node(cpu));
- cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
- cpumask_set_cpu(cpu, cpu_core_mask(cpu));
- for (i = first_thread; i < first_thread + threads_per_core; i++)
- if (cpu_online(i))
- set_cpus_related(i, cpu, cpu_sibling_mask);
- add_cpu_to_smallcore_masks(cpu);
- /* In CPU-hotplug path, hence use GFP_ATOMIC */
- ret = alloc_cpumask_var_node(&mask, GFP_ATOMIC, cpu_to_node(cpu));
- update_mask_by_l2(cpu, &mask);
- if (has_coregroup_support())
- update_coregroup_mask(cpu, &mask);
- if (chip_id_lookup_table && ret)
- chip_id = cpu_to_chip_id(cpu);
- if (shared_caches)
- submask_fn = cpu_l2_cache_mask;
- /* Update core_mask with all the CPUs that are part of submask */
- or_cpumasks_related(cpu, cpu, submask_fn, cpu_core_mask);
- /* Skip all CPUs already part of current CPU core mask */
- cpumask_andnot(mask, cpu_online_mask, cpu_core_mask(cpu));
- /* If chip_id is -1; limit the cpu_core_mask to within DIE*/
- if (chip_id == -1)
- cpumask_and(mask, mask, cpu_cpu_mask(cpu));
- for_each_cpu(i, mask) {
- if (chip_id == cpu_to_chip_id(i)) {
- or_cpumasks_related(cpu, i, submask_fn, cpu_core_mask);
- cpumask_andnot(mask, mask, submask_fn(i));
- } else {
- cpumask_andnot(mask, mask, cpu_core_mask(i));
- }
- }
- free_cpumask_var(mask);
- }
- /* Activate a secondary processor. */
- void start_secondary(void *unused)
- {
- unsigned int cpu = raw_smp_processor_id();
- /* PPC64 calls setup_kup() in early_setup_secondary() */
- if (IS_ENABLED(CONFIG_PPC32))
- setup_kup();
- mmgrab(&init_mm);
- current->active_mm = &init_mm;
- smp_store_cpu_info(cpu);
- set_dec(tb_ticks_per_jiffy);
- rcu_cpu_starting(cpu);
- cpu_callin_map[cpu] = 1;
- if (smp_ops->setup_cpu)
- smp_ops->setup_cpu(cpu);
- if (smp_ops->take_timebase)
- smp_ops->take_timebase();
- secondary_cpu_time_init();
- #ifdef CONFIG_PPC64
- if (system_state == SYSTEM_RUNNING)
- vdso_data->processorCount++;
- vdso_getcpu_init();
- #endif
- set_numa_node(numa_cpu_lookup_table[cpu]);
- set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu]));
- /* Update topology CPU masks */
- add_cpu_to_masks(cpu);
- /*
- * Check for any shared caches. Note that this must be done on a
- * per-core basis because one core in the pair might be disabled.
- */
- if (!shared_caches) {
- struct cpumask *(*sibling_mask)(int) = cpu_sibling_mask;
- struct cpumask *mask = cpu_l2_cache_mask(cpu);
- if (has_big_cores)
- sibling_mask = cpu_smallcore_mask;
- if (cpumask_weight(mask) > cpumask_weight(sibling_mask(cpu)))
- shared_caches = true;
- }
- smp_wmb();
- notify_cpu_starting(cpu);
- set_cpu_online(cpu, true);
- boot_init_stack_canary();
- local_irq_enable();
- /* We can enable ftrace for secondary cpus now */
- this_cpu_enable_ftrace();
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
- BUG();
- }
- static void __init fixup_topology(void)
- {
- int i;
- #ifdef CONFIG_SCHED_SMT
- if (has_big_cores) {
- pr_info("Big cores detected but using small core scheduling\n");
- powerpc_topology[smt_idx].mask = smallcore_smt_mask;
- }
- #endif
- if (!has_coregroup_support())
- powerpc_topology[mc_idx].mask = powerpc_topology[cache_idx].mask;
- /*
- * Try to consolidate topology levels here instead of
- * allowing scheduler to degenerate.
- * - Dont consolidate if masks are different.
- * - Dont consolidate if sd_flags exists and are different.
- */
- for (i = 1; i <= die_idx; i++) {
- if (powerpc_topology[i].mask != powerpc_topology[i - 1].mask)
- continue;
- if (powerpc_topology[i].sd_flags && powerpc_topology[i - 1].sd_flags &&
- powerpc_topology[i].sd_flags != powerpc_topology[i - 1].sd_flags)
- continue;
- if (!powerpc_topology[i - 1].sd_flags)
- powerpc_topology[i - 1].sd_flags = powerpc_topology[i].sd_flags;
- powerpc_topology[i].mask = powerpc_topology[i + 1].mask;
- powerpc_topology[i].sd_flags = powerpc_topology[i + 1].sd_flags;
- #ifdef CONFIG_SCHED_DEBUG
- powerpc_topology[i].name = powerpc_topology[i + 1].name;
- #endif
- }
- }
- void __init smp_cpus_done(unsigned int max_cpus)
- {
- /*
- * We are running pinned to the boot CPU, see rest_init().
- */
- if (smp_ops && smp_ops->setup_cpu)
- smp_ops->setup_cpu(boot_cpuid);
- if (smp_ops && smp_ops->bringup_done)
- smp_ops->bringup_done();
- dump_numa_cpu_topology();
- fixup_topology();
- set_sched_topology(powerpc_topology);
- }
- #ifdef CONFIG_HOTPLUG_CPU
- int __cpu_disable(void)
- {
- int cpu = smp_processor_id();
- int err;
- if (!smp_ops->cpu_disable)
- return -ENOSYS;
- this_cpu_disable_ftrace();
- err = smp_ops->cpu_disable();
- if (err)
- return err;
- /* Update sibling maps */
- remove_cpu_from_masks(cpu);
- return 0;
- }
- void __cpu_die(unsigned int cpu)
- {
- if (smp_ops->cpu_die)
- smp_ops->cpu_die(cpu);
- }
- void arch_cpu_idle_dead(void)
- {
- /*
- * Disable on the down path. This will be re-enabled by
- * start_secondary() via start_secondary_resume() below
- */
- this_cpu_disable_ftrace();
- if (smp_ops->cpu_offline_self)
- smp_ops->cpu_offline_self();
- /* If we return, we re-enter start_secondary */
- start_secondary_resume();
- }
- #endif
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