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Kernel/NVMeQueue: Use waitqueue in submit_sync_sqe

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The current way we handle sync commands is very ugly and depends on lot
of preconditions. Now that we have an end_io handler for a request, we
can use WaitQueue to do sync commands more elegantly.

This does depend on block layer sending one request at a time but this
change is a step forward towards better IO handling.
This commit is contained in:
Pankaj Raghav 2023-03-27 15:18:08 +02:00 • committed by Jelle Raaijmakers
parent 0096eadf40
commit a65b0cbe4a
2 changed files with 7 additions and 16 deletions
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22
Kernel/Storage/NVMe/NVMeQueue.cpp
View file

@ -105,7 +105,7 @@ void NVMeQueue::submit_sqe(NVMeSubmission& sub)
u16 NVMeQueue::submit_sync_sqe(NVMeSubmission& sub)
{
// For now let's use sq tail as a unique command id.
u16 cqe_cid;
u16 cmd_status;
u16 cid = get_request_cid();
sub.cmdid = cid;
@ -114,24 +114,14 @@ u16 NVMeQueue::submit_sync_sqe(NVMeSubmission& sub)
if (m_requests.contains(sub.cmdid) && m_requests.get(sub.cmdid).release_value().used)
VERIFY_NOT_REACHED();
m_requests.set(sub.cmdid, { nullptr, true, nullptr });
m_requests.set(sub.cmdid, { nullptr, true, [this, &cmd_status](u16 status) mutable { cmd_status = status; m_sync_wait_queue.wake_all(); } });
}
submit_sqe(sub);
do {
int index;
{
SpinlockLocker lock(m_cq_lock);
index = m_cq_head - 1;
if (index < 0)
index = m_qdepth - 1;
}
cqe_cid = m_cqe_array[index].command_id;
microseconds_delay(1);
} while (cid != cqe_cid);
auto status = CQ_STATUS_FIELD(m_cqe_array[m_cq_head].status);
return status;
// FIXME: Only sync submissions (usually used for admin commands) use a WaitQueue based IO. Eventually we need to
// move this logic into the block layer instead of sprinkling them in the driver code.
m_sync_wait_queue.wait_forever("NVMe sync submit"sv);
return cmd_status;
}
void NVMeQueue::read(AsyncBlockDeviceRequest& request, u16 nsid, u64 index, u32 count)

1
Kernel/Storage/NVMe/NVMeQueue.h
View file

@ -95,6 +95,7 @@ private:
OwnPtr<Memory::Region> m_sq_dma_region;
Vector<NonnullRefPtr<Memory::PhysicalPage>> m_sq_dma_page;
Span<NVMeCompletion> m_cqe_array;
WaitQueue m_sync_wait_queue;
Memory::TypedMapping<DoorbellRegister volatile> m_db_regs;
NonnullRefPtr<Memory::PhysicalPage const> m_rw_dma_page;
};