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The CONFIG_IPI_OPTIMIZE configuration option allows for the flagging and subsequent signaling of IPIs to be optimized. It does this by making each bit in the kernel's pending_ipi field a flag that indicates whether the corresponding CPU might need an IPI to trigger the scheduling of a new thread on that CPU. When a new thread is made ready, we compare that thread against each of the threads currently executing on the other CPUs. If there is a chance that that thread should preempt the thread on the other CPU then we flag that an IPI is needed for that CPU. That is, a clear bit indicates that the CPU absolutely will not need to reschedule, while a set bit indicates that the target CPU must make that determination for itself. Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
32 lines
761 B
C
32 lines
761 B
C
/*
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* Copyright (c) 2024 Intel Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_KERNEL_INCLUDE_IPI_H_
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#define ZEPHYR_KERNEL_INCLUDE_IPI_H_
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#include <zephyr/kernel.h>
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#include <stdint.h>
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#include <zephyr/sys/atomic.h>
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#define IPI_ALL_CPUS_MASK ((1 << CONFIG_MP_MAX_NUM_CPUS) - 1)
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#define IPI_CPU_MASK(cpu_id) \
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(IS_ENABLED(CONFIG_IPI_OPTIMIZE) ? BIT(cpu_id) : IPI_ALL_CPUS_MASK)
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/* defined in ipi.c when CONFIG_SMP=y */
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#ifdef CONFIG_SMP
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void flag_ipi(uint32_t ipi_mask);
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void signal_pending_ipi(void);
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atomic_val_t ipi_mask_create(struct k_thread *thread);
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#else
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#define flag_ipi(ipi_mask) do { } while (false)
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#define signal_pending_ipi() do { } while (false)
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#endif /* CONFIG_SMP */
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#endif /* ZEPHYR_KERNEL_INCLUDE_IPI_H_ */
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