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https://github.com/projectacrn/acrn-hypervisor.git
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e591315a65
The current implementation of per_cpu relies on several non-c99 features, and in additional involves arbitrary pointer arithmetic which is not MIS- RA C friendly. This patch introduces struct per_cpu_region which holds all the per_cpu variables. Allocation of per_cpu data regions and access to per_cpu vari- ables are greatly simplified, at the cost of making all per_cpu varaibl- es accessible in files. Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>
89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <hypervisor.h>
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void disable_softirq(int cpu_id)
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{
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bitmap_clear(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, cpu_id));
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}
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void enable_softirq(int cpu_id)
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{
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bitmap_set(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, cpu_id));
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}
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void init_softirq(void)
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{
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int cpu_id;
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for (cpu_id = 0; cpu_id < phy_cpu_num; cpu_id++) {
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per_cpu(softirq_pending, cpu_id) = 0;
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bitmap_set(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, cpu_id));
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}
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}
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void raise_softirq(int softirq_id)
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{
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int cpu_id = get_cpu_id();
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uint64_t *bitmap = &per_cpu(softirq_pending, cpu_id);
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if (cpu_id >= phy_cpu_num)
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return;
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bitmap_set(softirq_id, bitmap);
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}
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void exec_softirq(void)
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{
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int cpu_id = get_cpu_id();
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uint64_t *bitmap = &per_cpu(softirq_pending, cpu_id);
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uint64_t rflag;
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int softirq_id;
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if (cpu_id >= phy_cpu_num)
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return;
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/* Disable softirq
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* SOFTIRQ_ATOMIC bit = 0 means softirq already in execution
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*/
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if (!bitmap_test_and_clear(SOFTIRQ_ATOMIC, bitmap))
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return;
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if (((*bitmap) & SOFTIRQ_MASK) == 0UL)
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goto ENABLE_AND_EXIT;
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/* check if we are in interrupt context */
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CPU_RFLAGS_SAVE(&rflag);
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if (!(rflag & (1<<9)))
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goto ENABLE_AND_EXIT;
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while (1) {
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softirq_id = ffs64(*bitmap);
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if ((softirq_id < 0) || (softirq_id >= SOFTIRQ_MAX))
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break;
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bitmap_clear(softirq_id, bitmap);
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switch (softirq_id) {
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case SOFTIRQ_TIMER:
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timer_softirq(cpu_id);
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break;
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case SOFTIRQ_DEV_ASSIGN:
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ptdev_softirq(cpu_id);
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break;
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default:
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break;
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}
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}
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ENABLE_AND_EXIT:
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enable_softirq(cpu_id);
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}
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