98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* Copyright (c) 2021 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <ipi.h>
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#include <ksched.h>
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#include <zephyr/kernel.h>
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#define MSIP_BASE 0x2000000UL
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#define MSIP(hartid) ((volatile uint32_t *)MSIP_BASE)[hartid]
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static atomic_val_t cpu_pending_ipi[CONFIG_MP_MAX_NUM_CPUS];
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#define IPI_SCHED 0
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#define IPI_FPU_FLUSH 1
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void arch_sched_directed_ipi(uint32_t cpu_bitmap)
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{
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unsigned int key = arch_irq_lock();
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unsigned int id = _current_cpu->id;
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unsigned int num_cpus = arch_num_cpus();
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for (unsigned int i = 0; i < num_cpus; i++) {
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if ((i != id) && _kernel.cpus[i].arch.online && ((cpu_bitmap & BIT(i)) != 0)) {
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atomic_set_bit(&cpu_pending_ipi[i], IPI_SCHED);
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MSIP(_kernel.cpus[i].arch.hartid) = 1;
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}
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}
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arch_irq_unlock(key);
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}
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#ifdef CONFIG_FPU_SHARING
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void arch_flush_fpu_ipi(unsigned int cpu)
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{
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atomic_set_bit(&cpu_pending_ipi[cpu], IPI_FPU_FLUSH);
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MSIP(_kernel.cpus[cpu].arch.hartid) = 1;
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}
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#endif /* CONFIG_FPU_SHARING */
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static void sched_ipi_handler(const void *unused)
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{
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ARG_UNUSED(unused);
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MSIP(csr_read(mhartid)) = 0;
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atomic_val_t pending_ipi = atomic_clear(&cpu_pending_ipi[_current_cpu->id]);
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if (pending_ipi & ATOMIC_MASK(IPI_SCHED)) {
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z_sched_ipi();
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}
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#ifdef CONFIG_FPU_SHARING
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if (pending_ipi & ATOMIC_MASK(IPI_FPU_FLUSH)) {
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/* disable IRQs */
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csr_clear(mstatus, MSTATUS_IEN);
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/* perform the flush */
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arch_flush_local_fpu();
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/*
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* No need to re-enable IRQs here as long as
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* this remains the last case.
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*/
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}
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#endif /* CONFIG_FPU_SHARING */
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}
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#ifdef CONFIG_FPU_SHARING
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/*
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* Make sure there is no pending FPU flush request for this CPU while
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* waiting for a contended spinlock to become available. This prevents
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* a deadlock when the lock we need is already taken by another CPU
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* that also wants its FPU content to be reinstated while such content
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* is still live in this CPU's FPU.
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*/
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void arch_spin_relax(void)
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{
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atomic_val_t *pending_ipi = &cpu_pending_ipi[_current_cpu->id];
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if (atomic_test_and_clear_bit(pending_ipi, IPI_FPU_FLUSH)) {
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/*
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* We may not be in IRQ context here hence cannot use
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* arch_flush_local_fpu() directly.
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*/
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arch_float_disable(_current_cpu->arch.fpu_owner);
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}
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}
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#endif /* CONFIG_FPU_SHARING */
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int arch_smp_init(void)
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{
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IRQ_CONNECT(RISCV_IRQ_MSOFT, 0, sched_ipi_handler, NULL, 0);
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irq_enable(RISCV_IRQ_MSOFT);
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return 0;
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}
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