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0096eadf40
There was a private variable named m_current_request which was used to track a single request at a time. This guarantee is given by the block layer where we wait on each IO. This design will break down in the driver once the block layer removes that constraint. Redesign the IO handling in a completely asynchronous way by maintaining requests up to queue depth. NVMeIO struct is introduced to track an IO submitted along with other information such whether the IO is still being processed and an endio callback which will be called during the end of a request. A hashmap private variable is created which will key based on the command id of a request with a value of NVMeIO. endio handler will come in handy if we are doing a sync request and we want to wake up the wait queue during the end. This change also simplified the code by removing some special condition in submit_sqe function, etc that were marked as FIXME for a long time.
22 lines
797 B
C++
22 lines
797 B
C++
/*
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* Copyright (c) 2022, Pankaj R <pankydev8@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Storage/NVMe/NVMeQueue.h>
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namespace Kernel {
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class NVMePollQueue : public NVMeQueue {
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public:
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NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, Vector<NonnullRefPtr<Memory::PhysicalPage>> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, Vector<NonnullRefPtr<Memory::PhysicalPage>> sq_dma_page, Memory::TypedMapping<DoorbellRegister volatile> db_regs);
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void submit_sqe(NVMeSubmission& submission) override;
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virtual ~NVMePollQueue() override {};
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private:
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virtual void complete_current_request(u16 cmdid, u16 status) override;
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};
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}
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