324 lines
6.1 KiB
C
324 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/percpu.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/irq_work.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/seq_file.h>
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#include <linux/sched/task_stack.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/hotplug.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include <asm/sections.h>
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#include <asm/mmu_context.h>
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#ifdef CONFIG_CPU_HAS_FPU
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#include <abi/fpu.h>
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#endif
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enum ipi_message_type {
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IPI_EMPTY,
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IPI_RESCHEDULE,
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IPI_CALL_FUNC,
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IPI_IRQ_WORK,
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IPI_MAX
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};
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struct ipi_data_struct {
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unsigned long bits ____cacheline_aligned;
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unsigned long stats[IPI_MAX] ____cacheline_aligned;
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};
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static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);
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static irqreturn_t handle_ipi(int irq, void *dev)
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{
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unsigned long *stats = this_cpu_ptr(&ipi_data)->stats;
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while (true) {
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unsigned long ops;
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ops = xchg(&this_cpu_ptr(&ipi_data)->bits, 0);
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if (ops == 0)
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return IRQ_HANDLED;
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if (ops & (1 << IPI_RESCHEDULE)) {
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stats[IPI_RESCHEDULE]++;
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scheduler_ipi();
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}
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if (ops & (1 << IPI_CALL_FUNC)) {
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stats[IPI_CALL_FUNC]++;
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generic_smp_call_function_interrupt();
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}
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if (ops & (1 << IPI_IRQ_WORK)) {
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stats[IPI_IRQ_WORK]++;
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irq_work_run();
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}
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BUG_ON((ops >> IPI_MAX) != 0);
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}
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return IRQ_HANDLED;
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}
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static void (*send_arch_ipi)(const struct cpumask *mask);
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static int ipi_irq;
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void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq)
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{
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if (send_arch_ipi)
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return;
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send_arch_ipi = func;
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ipi_irq = irq;
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}
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static void
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send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
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{
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int i;
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for_each_cpu(i, to_whom)
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set_bit(operation, &per_cpu_ptr(&ipi_data, i)->bits);
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smp_mb();
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send_arch_ipi(to_whom);
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}
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static const char * const ipi_names[] = {
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[IPI_EMPTY] = "Empty interrupts",
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[IPI_RESCHEDULE] = "Rescheduling interrupts",
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[IPI_CALL_FUNC] = "Function call interrupts",
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[IPI_IRQ_WORK] = "Irq work interrupts",
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};
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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unsigned int cpu, i;
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for (i = 0; i < IPI_MAX; i++) {
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seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
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prec >= 4 ? " " : "");
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for_each_online_cpu(cpu)
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seq_printf(p, "%10lu ",
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per_cpu_ptr(&ipi_data, cpu)->stats[i]);
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seq_printf(p, " %s\n", ipi_names[i]);
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}
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return 0;
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}
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void arch_send_call_function_ipi_mask(struct cpumask *mask)
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{
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send_ipi_message(mask, IPI_CALL_FUNC);
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}
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void arch_send_call_function_single_ipi(int cpu)
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{
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send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
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}
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static void ipi_stop(void *unused)
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{
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while (1);
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}
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void smp_send_stop(void)
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{
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on_each_cpu(ipi_stop, NULL, 1);
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}
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void arch_smp_send_reschedule(int cpu)
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{
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send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
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}
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#ifdef CONFIG_IRQ_WORK
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void arch_irq_work_raise(void)
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{
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send_ipi_message(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
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}
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#endif
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void __init smp_prepare_boot_cpu(void)
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{
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}
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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}
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static int ipi_dummy_dev;
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void __init setup_smp_ipi(void)
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{
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int rc;
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if (ipi_irq == 0)
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return;
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rc = request_percpu_irq(ipi_irq, handle_ipi, "IPI Interrupt",
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&ipi_dummy_dev);
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if (rc)
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panic("%s IRQ request failed\n", __func__);
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enable_percpu_irq(ipi_irq, 0);
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}
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void __init setup_smp(void)
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{
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struct device_node *node = NULL;
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unsigned int cpu;
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for_each_of_cpu_node(node) {
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if (!of_device_is_available(node))
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continue;
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cpu = of_get_cpu_hwid(node, 0);
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if (cpu >= NR_CPUS)
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continue;
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set_cpu_possible(cpu, true);
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set_cpu_present(cpu, true);
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}
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}
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extern void _start_smp_secondary(void);
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volatile unsigned int secondary_hint;
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volatile unsigned int secondary_hint2;
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volatile unsigned int secondary_ccr;
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volatile unsigned int secondary_stack;
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volatile unsigned int secondary_msa1;
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volatile unsigned int secondary_pgd;
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int __cpu_up(unsigned int cpu, struct task_struct *tidle)
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{
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unsigned long mask = 1 << cpu;
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secondary_stack =
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(unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
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secondary_hint = mfcr("cr31");
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secondary_hint2 = mfcr("cr<21, 1>");
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secondary_ccr = mfcr("cr18");
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secondary_msa1 = read_mmu_msa1();
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secondary_pgd = mfcr("cr<29, 15>");
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/*
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* Because other CPUs are in reset status, we must flush data
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* from cache to out and secondary CPUs use them in
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* csky_start_secondary(void)
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*/
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mtcr("cr17", 0x22);
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if (mask & mfcr("cr<29, 0>")) {
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send_arch_ipi(cpumask_of(cpu));
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} else {
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/* Enable cpu in SMP reset ctrl reg */
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mask |= mfcr("cr<29, 0>");
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mtcr("cr<29, 0>", mask);
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}
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/* Wait for the cpu online */
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while (!cpu_online(cpu));
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secondary_stack = 0;
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return 0;
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}
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void __init smp_cpus_done(unsigned int max_cpus)
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{
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}
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void csky_start_secondary(void)
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{
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struct mm_struct *mm = &init_mm;
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unsigned int cpu = smp_processor_id();
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mtcr("cr31", secondary_hint);
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mtcr("cr<21, 1>", secondary_hint2);
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mtcr("cr18", secondary_ccr);
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mtcr("vbr", vec_base);
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flush_tlb_all();
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write_mmu_pagemask(0);
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#ifdef CONFIG_CPU_HAS_FPU
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init_fpu();
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#endif
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enable_percpu_irq(ipi_irq, 0);
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mmget(mm);
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mmgrab(mm);
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current->active_mm = mm;
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cpumask_set_cpu(cpu, mm_cpumask(mm));
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notify_cpu_starting(cpu);
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set_cpu_online(cpu, true);
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pr_info("CPU%u Online: %s...\n", cpu, __func__);
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local_irq_enable();
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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int __cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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set_cpu_online(cpu, false);
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irq_migrate_all_off_this_cpu();
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clear_tasks_mm_cpumask(cpu);
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return 0;
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}
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void __cpu_die(unsigned int cpu)
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{
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if (!cpu_wait_death(cpu, 5)) {
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pr_crit("CPU%u: shutdown failed\n", cpu);
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return;
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}
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pr_notice("CPU%u: shutdown\n", cpu);
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}
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void __noreturn arch_cpu_idle_dead(void)
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{
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idle_task_exit();
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cpu_report_death();
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while (!secondary_stack)
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arch_cpu_idle();
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raw_local_irq_disable();
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asm volatile(
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"mov sp, %0\n"
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"mov r8, %0\n"
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"jmpi csky_start_secondary"
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:
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: "r" (secondary_stack));
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BUG();
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}
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#endif
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