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328 lines
6.1 KiB
328 lines
6.1 KiB
// 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 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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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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if (of_property_read_u32(node, "reg", &cpu)) |
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continue; |
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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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int setup_profiling_timer(unsigned int multiplier) |
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{ |
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return -EINVAL; |
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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 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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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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} |
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#endif
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