forked from Bananymous/banan-os
83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
#include <kernel/LockGuard.h>
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#include <kernel/Scheduler.h>
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#include <kernel/Storage/NVMe/Queue.h>
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#include <kernel/Timer/Timer.h>
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namespace Kernel
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{
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static constexpr uint64_t s_nvme_command_timeout_ms = 1000;
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static constexpr uint64_t s_nvme_command_poll_timeout_ms = 20;
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NVMeQueue::NVMeQueue(BAN::UniqPtr<Kernel::DMARegion>&& cq, BAN::UniqPtr<Kernel::DMARegion>&& sq, volatile NVMe::DoorbellRegisters& db, uint32_t qdepth, uint8_t irq)
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: m_completion_queue(BAN::move(cq))
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, m_submission_queue(BAN::move(sq))
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, m_doorbell(db)
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, m_qdepth(qdepth)
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{
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set_irq(irq);
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enable_interrupt();
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}
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void NVMeQueue::handle_irq()
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{
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auto* cq_ptr = reinterpret_cast<NVMe::CompletionQueueEntry*>(m_completion_queue->vaddr());
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while ((cq_ptr[m_cq_head].sts & 1) == m_cq_valid_phase)
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{
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uint16_t sts = cq_ptr[m_cq_head].sts >> 1;
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uint16_t cid = cq_ptr[m_cq_head].cid;
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ASSERT(cid == 0);
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ASSERT(!m_done);
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m_status = sts;
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m_done = true;
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m_semaphore.unblock();
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m_cq_head = (m_cq_head + 1) % m_qdepth;
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if (m_cq_head == 0)
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m_cq_valid_phase ^= 1;
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}
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m_doorbell.cq_head = m_cq_head;
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}
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uint16_t NVMeQueue::submit_command(NVMe::SubmissionQueueEntry& sqe)
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{
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LockGuard _(m_lock);
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ASSERT(m_done == false);
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m_status = 0;
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sqe.cid = 0;
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auto* sqe_ptr = reinterpret_cast<NVMe::SubmissionQueueEntry*>(m_submission_queue->vaddr());
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memcpy(&sqe_ptr[m_sq_tail], &sqe, sizeof(NVMe::SubmissionQueueEntry));
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m_sq_tail = (m_sq_tail + 1) % m_qdepth;
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m_doorbell.sq_tail = m_sq_tail;
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const uint64_t start_time = SystemTimer::get().ms_since_boot();
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while (SystemTimer::get().ms_since_boot() < start_time + s_nvme_command_poll_timeout_ms)
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{
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if (!m_done)
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continue;
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m_done = false;
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return m_status;
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}
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while (SystemTimer::get().ms_since_boot() < start_time + s_nvme_command_timeout_ms)
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{
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if (!m_done)
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{
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m_semaphore.block();
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continue;
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}
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m_done = false;
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return m_status;
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}
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return 0xFFFF;
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}
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}
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