Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 721 insertions, 0 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
new file mode 100644
index 000000000..14db66dbc
--- /dev/null
+++ b/arch/mips/kernel/smp.c
@@ -0,0 +1,721 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) 2000, 2001 Kanoj Sarcar
+ * Copyright (C) 2000, 2001 Ralf Baechle
+ * Copyright (C) 2000, 2001 Silicon Graphics, Inc.
+ * Copyright (C) 2000, 2001, 2003 Broadcom Corporation
+ */
+#include <linux/cache.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/threads.h>
+#include <linux/export.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/sched/mm.h>
+#include <linux/cpumask.h>
+#include <linux/cpu.h>
+#include <linux/err.h>
+#include <linux/ftrace.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+
+#include <linux/atomic.h>
+#include <asm/cpu.h>
+#include <asm/ginvt.h>
+#include <asm/processor.h>
+#include <asm/idle.h>
+#include <asm/r4k-timer.h>
+#include <asm/mips-cps.h>
+#include <asm/mmu_context.h>
+#include <asm/time.h>
+#include <asm/setup.h>
+#include <asm/maar.h>
+
+int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];   /* Map physical to logical */
+EXPORT_SYMBOL(__cpu_number_map);
+
+int __cpu_logical_map[NR_CPUS];         /* Map logical to physical */
+EXPORT_SYMBOL(__cpu_logical_map);
+
+/* Number of TCs (or siblings in Intel speak) per CPU core */
+int smp_num_siblings = 1;
+EXPORT_SYMBOL(smp_num_siblings);
+
+/* representing the TCs (or siblings in Intel speak) of each logical CPU */
+cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(cpu_sibling_map);
+
+/* representing the core map of multi-core chips of each logical CPU */
+cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(cpu_core_map);
+
+static DECLARE_COMPLETION(cpu_starting);
+static DECLARE_COMPLETION(cpu_running);
+
+/*
+ * A logcal cpu mask containing only one VPE per core to
+ * reduce the number of IPIs on large MT systems.
+ */
+cpumask_t cpu_foreign_map[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(cpu_foreign_map);
+
+/* representing cpus for which sibling maps can be computed */
+static cpumask_t cpu_sibling_setup_map;
+
+/* representing cpus for which core maps can be computed */
+static cpumask_t cpu_core_setup_map;
+
+cpumask_t cpu_coherent_mask;
+
+#ifdef CONFIG_GENERIC_IRQ_IPI
+static struct irq_desc *call_desc;
+static struct irq_desc *sched_desc;
+#endif
+
+static inline void set_cpu_sibling_map(int cpu)
+{
+        int i;
+
+        cpumask_set_cpu(cpu, &cpu_sibling_setup_map);
+
+        if (smp_num_siblings > 1) {
+                for_each_cpu(i, &cpu_sibling_setup_map) {
+                        if (cpus_are_siblings(cpu, i)) {
+                                cpumask_set_cpu(i, &cpu_sibling_map[cpu]);
+                                cpumask_set_cpu(cpu, &cpu_sibling_map[i]);
+                        }
+                }
+        } else
+                cpumask_set_cpu(cpu, &cpu_sibling_map[cpu]);
+}
+
+static inline void set_cpu_core_map(int cpu)
+{
+        int i;
+
+        cpumask_set_cpu(cpu, &cpu_core_setup_map);
+
+        for_each_cpu(i, &cpu_core_setup_map) {
+                if (cpu_data[cpu].package == cpu_data[i].package) {
+                        cpumask_set_cpu(i, &cpu_core_map[cpu]);
+                        cpumask_set_cpu(cpu, &cpu_core_map[i]);
+                }
+        }
+}
+
+/*
+ * Calculate a new cpu_foreign_map mask whenever a
+ * new cpu appears or disappears.
+ */
+void calculate_cpu_foreign_map(void)
+{
+        int i, k, core_present;
+        cpumask_t temp_foreign_map;
+
+        /* Re-calculate the mask */
+        cpumask_clear(&temp_foreign_map);
+        for_each_online_cpu(i) {
+                core_present = 0;
+                for_each_cpu(k, &temp_foreign_map)
+                        if (cpus_are_siblings(i, k))
+                                core_present = 1;
+                if (!core_present)
+                        cpumask_set_cpu(i, &temp_foreign_map);
+        }
+
+        for_each_online_cpu(i)
+                cpumask_andnot(&cpu_foreign_map[i],
+                               &temp_foreign_map, &cpu_sibling_map[i]);
+}
+
+const struct plat_smp_ops *mp_ops;
+EXPORT_SYMBOL(mp_ops);
+
+void register_smp_ops(const struct plat_smp_ops *ops)
+{
+        if (mp_ops)
+                printk(KERN_WARNING "Overriding previously set SMP ops\n");
+
+        mp_ops = ops;
+}
+
+#ifdef CONFIG_GENERIC_IRQ_IPI
+void mips_smp_send_ipi_single(int cpu, unsigned int action)
+{
+        mips_smp_send_ipi_mask(cpumask_of(cpu), action);
+}
+
+void mips_smp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
+{
+        unsigned long flags;
+        unsigned int core;
+        int cpu;
+
+        local_irq_save(flags);
+
+        switch (action) {
+        case SMP_CALL_FUNCTION:
+                __ipi_send_mask(call_desc, mask);
+                break;
+
+        case SMP_RESCHEDULE_YOURSELF:
+                __ipi_send_mask(sched_desc, mask);
+                break;
+
+        default:
+                BUG();
+        }
+
+        if (mips_cpc_present()) {
+                for_each_cpu(cpu, mask) {
+                        if (cpus_are_siblings(cpu, smp_processor_id()))
+                                continue;
+
+                        core = cpu_core(&cpu_data[cpu]);
+
+                        while (!cpumask_test_cpu(cpu, &cpu_coherent_mask)) {
+                                mips_cm_lock_other_cpu(cpu, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+                                mips_cpc_lock_other(core);
+                                write_cpc_co_cmd(CPC_Cx_CMD_PWRUP);
+                                mips_cpc_unlock_other();
+                                mips_cm_unlock_other();
+                        }
+                }
+        }
+
+        local_irq_restore(flags);
+}
+
+
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
+{
+        scheduler_ipi();
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
+{
+        generic_smp_call_function_interrupt();
+
+        return IRQ_HANDLED;
+}
+
+static void smp_ipi_init_one(unsigned int virq, const char *name,
+                             irq_handler_t handler)
+{
+        int ret;
+
+        irq_set_handler(virq, handle_percpu_irq);
+        ret = request_irq(virq, handler, IRQF_PERCPU, name, NULL);
+        BUG_ON(ret);
+}
+
+static unsigned int call_virq, sched_virq;
+
+int mips_smp_ipi_allocate(const struct cpumask *mask)
+{
+        int virq;
+        struct irq_domain *ipidomain;
+        struct device_node *node;
+
+        node = of_irq_find_parent(of_root);
+        ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);
+
+        /*
+         * Some platforms have half DT setup. So if we found irq node but
+         * didn't find an ipidomain, try to search for one that is not in the
+         * DT.
+         */
+        if (node && !ipidomain)
+                ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI);
+
+        /*
+         * There are systems which use IPI IRQ domains, but only have one
+         * registered when some runtime condition is met. For example a Malta
+         * kernel may include support for GIC & CPU interrupt controller IPI
+         * IRQ domains, but if run on a system with no GIC & no MT ASE then
+         * neither will be supported or registered.
+         *
+         * We only have a problem if we're actually using multiple CPUs so fail
+         * loudly if that is the case. Otherwise simply return, skipping IPI
+         * setup, if we're running with only a single CPU.
+         */
+        if (!ipidomain) {
+                BUG_ON(num_present_cpus() > 1);
+                return 0;
+        }
+
+        virq = irq_reserve_ipi(ipidomain, mask);
+        BUG_ON(!virq);
+        if (!call_virq)
+                call_virq = virq;
+
+        virq = irq_reserve_ipi(ipidomain, mask);
+        BUG_ON(!virq);
+        if (!sched_virq)
+                sched_virq = virq;
+
+        if (irq_domain_is_ipi_per_cpu(ipidomain)) {
+                int cpu;
+
+                for_each_cpu(cpu, mask) {
+                        smp_ipi_init_one(call_virq + cpu, "IPI call",
+                                         ipi_call_interrupt);
+                        smp_ipi_init_one(sched_virq + cpu, "IPI resched",
+                                         ipi_resched_interrupt);
+                }
+        } else {
+                smp_ipi_init_one(call_virq, "IPI call", ipi_call_interrupt);
+                smp_ipi_init_one(sched_virq, "IPI resched",
+                                 ipi_resched_interrupt);
+        }
+
+        return 0;
+}
+
+int mips_smp_ipi_free(const struct cpumask *mask)
+{
+        struct irq_domain *ipidomain;
+        struct device_node *node;
+
+        node = of_irq_find_parent(of_root);
+        ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);
+
+        /*
+         * Some platforms have half DT setup. So if we found irq node but
+         * didn't find an ipidomain, try to search for one that is not in the
+         * DT.
+         */
+        if (node && !ipidomain)
+                ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI);
+
+        BUG_ON(!ipidomain);
+
+        if (irq_domain_is_ipi_per_cpu(ipidomain)) {
+                int cpu;
+
+                for_each_cpu(cpu, mask) {
+                        free_irq(call_virq + cpu, NULL);
+                        free_irq(sched_virq + cpu, NULL);
+                }
+        }
+        irq_destroy_ipi(call_virq, mask);
+        irq_destroy_ipi(sched_virq, mask);
+        return 0;
+}
+
+
+static int __init mips_smp_ipi_init(void)
+{
+        if (num_possible_cpus() == 1)
+                return 0;
+
+        mips_smp_ipi_allocate(cpu_possible_mask);
+
+        call_desc = irq_to_desc(call_virq);
+        sched_desc = irq_to_desc(sched_virq);
+
+        return 0;
+}
+early_initcall(mips_smp_ipi_init);
+#endif
+
+/*
+ * First C code run on the secondary CPUs after being started up by
+ * the master.
+ */
+asmlinkage void start_secondary(void)
+{
+        unsigned int cpu;
+
+        cpu_probe();
+        per_cpu_trap_init(false);
+        mips_clockevent_init();
+        mp_ops->init_secondary();
+        cpu_report();
+        maar_init();
+
+        /*
+         * XXX parity protection should be folded in here when it's converted
+         * to an option instead of something based on .cputype
+         */
+
+        calibrate_delay();
+        cpu = smp_processor_id();
+        cpu_data[cpu].udelay_val = loops_per_jiffy;
+
+        set_cpu_sibling_map(cpu);
+        set_cpu_core_map(cpu);
+
+        cpumask_set_cpu(cpu, &cpu_coherent_mask);
+        notify_cpu_starting(cpu);
+
+        /* Notify boot CPU that we're starting & ready to sync counters */
+        complete(&cpu_starting);
+
+        synchronise_count_slave(cpu);
+
+        /* The CPU is running and counters synchronised, now mark it online */
+        set_cpu_online(cpu, true);
+
+        calculate_cpu_foreign_map();
+
+        /*
+         * Notify boot CPU that we're up & online and it can safely return
+         * from __cpu_up
+         */
+        complete(&cpu_running);
+
+        /*
+         * irq will be enabled in ->smp_finish(), enabling it too early
+         * is dangerous.
+         */
+        WARN_ON_ONCE(!irqs_disabled());
+        mp_ops->smp_finish();
+
+        cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
+
+static void stop_this_cpu(void *dummy)
+{
+        /*
+         * Remove this CPU:
+         */
+
+        set_cpu_online(smp_processor_id(), false);
+        calculate_cpu_foreign_map();
+        local_irq_disable();
+        while (1);
+}
+
+void smp_send_stop(void)
+{
+        smp_call_function(stop_this_cpu, NULL, 0);
+}
+
+void __init smp_cpus_done(unsigned int max_cpus)
+{
+}
+
+/* called from main before smp_init() */
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+        init_new_context(current, &init_mm);
+        current_thread_info()->cpu = 0;
+        mp_ops->prepare_cpus(max_cpus);
+        set_cpu_sibling_map(0);
+        set_cpu_core_map(0);
+        calculate_cpu_foreign_map();
+#ifndef CONFIG_HOTPLUG_CPU
+        init_cpu_present(cpu_possible_mask);
+#endif
+        cpumask_copy(&cpu_coherent_mask, cpu_possible_mask);
+}
+
+/* preload SMP state for boot cpu */
+void smp_prepare_boot_cpu(void)
+{
+        if (mp_ops->prepare_boot_cpu)
+                mp_ops->prepare_boot_cpu();
+        set_cpu_possible(0, true);
+        set_cpu_online(0, true);
+}
+
+int __cpu_up(unsigned int cpu, struct task_struct *tidle)
+{
+        int err;
+
+        err = mp_ops->boot_secondary(cpu, tidle);
+        if (err)
+                return err;
+
+        /* Wait for CPU to start and be ready to sync counters */
+        if (!wait_for_completion_timeout(&cpu_starting,
+                                         msecs_to_jiffies(1000))) {
+                pr_crit("CPU%u: failed to start\n", cpu);
+                return -EIO;
+        }
+
+        synchronise_count_master(cpu);
+
+        /* Wait for CPU to finish startup & mark itself online before return */
+        wait_for_completion(&cpu_running);
+        return 0;
+}
+
+/* Not really SMP stuff ... */
+int setup_profiling_timer(unsigned int multiplier)
+{
+        return 0;
+}
+
+static void flush_tlb_all_ipi(void *info)
+{
+        local_flush_tlb_all();
+}
+
+void flush_tlb_all(void)
+{
+        if (cpu_has_mmid) {
+                htw_stop();
+                ginvt_full();
+                sync_ginv();
+                instruction_hazard();
+                htw_start();
+                return;
+        }
+
+        on_each_cpu(flush_tlb_all_ipi, NULL, 1);
+}
+
+static void flush_tlb_mm_ipi(void *mm)
+{
+        drop_mmu_context((struct mm_struct *)mm);
+}
+
+/*
+ * Special Variant of smp_call_function for use by TLB functions:
+ *
+ *  o No return value
+ *  o collapses to normal function call on UP kernels
+ *  o collapses to normal function call on systems with a single shared
+ *    primary cache.
+ */
+static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
+{
+        smp_call_function(func, info, 1);
+}
+
+static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
+{
+        preempt_disable();
+
+        smp_on_other_tlbs(func, info);
+        func(info);
+
+        preempt_enable();
+}
+
+/*
+ * The following tlb flush calls are invoked when old translations are
+ * being torn down, or pte attributes are changing. For single threaded
+ * address spaces, a new context is obtained on the current cpu, and tlb
+ * context on other cpus are invalidated to force a new context allocation
+ * at switch_mm time, should the mm ever be used on other cpus. For
+ * multithreaded address spaces, intercpu interrupts have to be sent.
+ * Another case where intercpu interrupts are required is when the target
+ * mm might be active on another cpu (eg debuggers doing the flushes on
+ * behalf of debugees, kswapd stealing pages from another process etc).
+ * Kanoj 07/00.
+ */
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+        preempt_disable();
+
+        if (cpu_has_mmid) {
+                /*
+                 * No need to worry about other CPUs - the ginvt in
+                 * drop_mmu_context() will be globalized.
+                 */
+        } else if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
+                smp_on_other_tlbs(flush_tlb_mm_ipi, mm);
+        } else {
+                unsigned int cpu;
+
+                for_each_online_cpu(cpu) {
+                        if (cpu != smp_processor_id() && cpu_context(cpu, mm))
+                                set_cpu_context(cpu, mm, 0);
+                }
+        }
+        drop_mmu_context(mm);
+
+        preempt_enable();
+}
+
+struct flush_tlb_data {
+        struct vm_area_struct *vma;
+        unsigned long addr1;
+        unsigned long addr2;
+};
+
+static void flush_tlb_range_ipi(void *info)
+{
+        struct flush_tlb_data *fd = info;
+
+        local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
+{
+        struct mm_struct *mm = vma->vm_mm;
+        unsigned long addr;
+        u32 old_mmid;
+
+        preempt_disable();
+        if (cpu_has_mmid) {
+                htw_stop();
+                old_mmid = read_c0_memorymapid();
+                write_c0_memorymapid(cpu_asid(0, mm));
+                mtc0_tlbw_hazard();
+                addr = round_down(start, PAGE_SIZE * 2);
+                end = round_up(end, PAGE_SIZE * 2);
+                do {
+                        ginvt_va_mmid(addr);
+                        sync_ginv();
+                        addr += PAGE_SIZE * 2;
+                } while (addr < end);
+                write_c0_memorymapid(old_mmid);
+                instruction_hazard();
+                htw_start();
+        } else if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
+                struct flush_tlb_data fd = {
+                        .vma = vma,
+                        .addr1 = start,
+                        .addr2 = end,
+                };
+
+                smp_on_other_tlbs(flush_tlb_range_ipi, &fd);
+                local_flush_tlb_range(vma, start, end);
+        } else {
+                unsigned int cpu;
+                int exec = vma->vm_flags & VM_EXEC;
+
+                for_each_online_cpu(cpu) {
+                        /*
+                         * flush_cache_range() will only fully flush icache if
+                         * the VMA is executable, otherwise we must invalidate
+                         * ASID without it appearing to has_valid_asid() as if
+                         * mm has been completely unused by that CPU.
+                         */
+                        if (cpu != smp_processor_id() && cpu_context(cpu, mm))
+                                set_cpu_context(cpu, mm, !exec);
+                }
+                local_flush_tlb_range(vma, start, end);
+        }
+        preempt_enable();
+}
+
+static void flush_tlb_kernel_range_ipi(void *info)
+{
+        struct flush_tlb_data *fd = info;
+
+        local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        struct flush_tlb_data fd = {
+                .addr1 = start,
+                .addr2 = end,
+        };
+
+        on_each_cpu(flush_tlb_kernel_range_ipi, &fd, 1);
+}
+
+static void flush_tlb_page_ipi(void *info)
+{
+        struct flush_tlb_data *fd = info;
+
+        local_flush_tlb_page(fd->vma, fd->addr1);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+        u32 old_mmid;
+
+        preempt_disable();
+        if (cpu_has_mmid) {
+                htw_stop();
+                old_mmid = read_c0_memorymapid();
+                write_c0_memorymapid(cpu_asid(0, vma->vm_mm));
+                mtc0_tlbw_hazard();
+                ginvt_va_mmid(page);
+                sync_ginv();
+                write_c0_memorymapid(old_mmid);
+                instruction_hazard();
+                htw_start();
+        } else if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
+                   (current->mm != vma->vm_mm)) {
+                struct flush_tlb_data fd = {
+                        .vma = vma,
+                        .addr1 = page,
+                };
+
+                smp_on_other_tlbs(flush_tlb_page_ipi, &fd);
+                local_flush_tlb_page(vma, page);
+        } else {
+                unsigned int cpu;
+
+                for_each_online_cpu(cpu) {
+                        /*
+                         * flush_cache_page() only does partial flushes, so
+                         * invalidate ASID without it appearing to
+                         * has_valid_asid() as if mm has been completely unused
+                         * by that CPU.
+                         */
+                        if (cpu != smp_processor_id() && cpu_context(cpu, vma->vm_mm))
+                                set_cpu_context(cpu, vma->vm_mm, 1);
+                }
+                local_flush_tlb_page(vma, page);
+        }
+        preempt_enable();
+}
+
+static void flush_tlb_one_ipi(void *info)
+{
+        unsigned long vaddr = (unsigned long) info;
+
+        local_flush_tlb_one(vaddr);
+}
+
+void flush_tlb_one(unsigned long vaddr)
+{
+        smp_on_each_tlb(flush_tlb_one_ipi, (void *) vaddr);
+}
+
+EXPORT_SYMBOL(flush_tlb_page);
+EXPORT_SYMBOL(flush_tlb_one);
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+
+static DEFINE_PER_CPU(call_single_data_t, tick_broadcast_csd);
+
+void tick_broadcast(const struct cpumask *mask)
+{
+        call_single_data_t *csd;
+        int cpu;
+
+        for_each_cpu(cpu, mask) {
+                csd = &per_cpu(tick_broadcast_csd, cpu);
+                smp_call_function_single_async(cpu, csd);
+        }
+}
+
+static void tick_broadcast_callee(void *info)
+{
+        tick_receive_broadcast();
+}
+
+static int __init tick_broadcast_init(void)
+{
+        call_single_data_t *csd;
+        int cpu;
+
+        for (cpu = 0; cpu < NR_CPUS; cpu++) {
+                csd = &per_cpu(tick_broadcast_csd, cpu);
+                csd->func = tick_broadcast_callee;
+        }
+
+        return 0;
+}
+early_initcall(tick_broadcast_init);
+
+#endif /* CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */