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feat: smp_call: added signaling call_req
This patch introduces `rt_smp_call_request` API to handle queued requests across cores with user provided data buffer, which provides a way to request IPI through a non-blocking pattern. It also resolved several issues in the old implementation: - Multiple requests from different cores can not be queued in the work object of the target core. - Data racing on `rt_smp_work` of same core. If multiple requests came in turns, or if the call is used by the target cpu, while a new request is coming, the value will be overwrite. - Memory vulnerability. The rt_smp_event is allocated on stack, though the caller may not wait until the call is done. - API naming problem. Actually we don't provide a way to issue an IPI to ANY core in mask. What the API do is aligned to MANY pattern. - FUNC_IPI registering to PIC. Changes: - Declared and configured the new `RT_SMP_CALL_IPI` to support functional IPIs for task requests across cores. - Replaced the single `rt_smp_work` array with `call_req_cores` to manage per-core call requests safely. - Added `_call_req_take` and `_call_req_release` functions for atomic handling of request lifetimes, preventing data race conditions. - Replaced single event handling with a queue-based approach (`call_queue`) for efficient multi-request processing per core. - Introduced `rt_smp_call_ipi_handler` to process queued requests, reducing IPI contention by only sending new requests when needed. - Implemented `_smp_call_remote_request` to handle remote requests with specific flags, enabling more flexible core-to-core task signaling. - Refined `rt_smp_call_req_init` to initialize and track requests with atomic usage flags, mitigating potential memory vulnerabilities. Signed-off-by: Shell <smokewood@qq.com>
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@@ -71,8 +71,9 @@ void gic_common_sgi_config(void *base, void *data, int irq_base)
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pirq = rt_pic_find_ipi(data, ipi); \
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pirq->mode = RT_IRQ_MODE_EDGE_RISING; \
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DECLARE_GIC_IPI(RT_SCHEDULE_IPI, 0);
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DECLARE_GIC_IPI(RT_STOP_IPI, 1);
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DECLARE_GIC_IPI(RT_SCHEDULE_IPI, RT_SCHEDULE_IPI);
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DECLARE_GIC_IPI(RT_STOP_IPI, RT_STOP_IPI);
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DECLARE_GIC_IPI(RT_SMP_CALL_IPI, RT_SMP_CALL_IPI);
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#undef DECLARE_GIC_IPI
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}
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@@ -31,6 +31,7 @@ static int _ipi_hash[] =
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#ifdef RT_USING_SMP
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[RT_SCHEDULE_IPI] = RT_SCHEDULE_IPI,
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[RT_STOP_IPI] = RT_STOP_IPI,
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[RT_SMP_CALL_IPI] = RT_SMP_CALL_IPI,
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#endif
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};
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