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Kernel: Add polling support to NVMe
Add polling support to NVMe so that it does not use interrupt to complete a IO but instead actively polls for completion. This probably is not very efficient in terms of CPU usage but it does not use interrupts to complete a IO which is beneficial at the moment as there is no MSI(X) support and it can reduce the latency of an IO in a very fast NVMe device. The NVMeQueue class has been made the base class for NVMeInterruptQueue and NVMePollQueue. The factory function `NVMeQueue::try_create` will return the appropriate queue to the controller based on the polling boot parameter. The polling mode can be enabled by adding an extra boot parameter: `nvme_poll`.
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13 changed files with 211 additions and 83 deletions
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@ -103,6 +103,8 @@ set(KERNEL_SOURCES
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Storage/Partition/PartitionTable.cpp
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Storage/NVMe/NVMeController.cpp
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Storage/NVMe/NVMeNameSpace.cpp
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Storage/NVMe/NVMeInterruptQueue.cpp
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Storage/NVMe/NVMePollQueue.cpp
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Storage/NVMe/NVMeQueue.cpp
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Storage/StorageDevice.cpp
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Storage/RamdiskController.cpp
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