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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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@ -23,7 +23,7 @@ class StorageManagement {
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public:
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StorageManagement();
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static bool initialized();
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void initialize(StringView boot_argument, bool force_pio);
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void initialize(StringView boot_argument, bool force_pio, bool nvme_poll);
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static StorageManagement& the();
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NonnullRefPtr<FileSystem> root_filesystem() const;
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@ -36,7 +36,7 @@ public:
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private:
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bool boot_argument_contains_partition_uuid();
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void enumerate_controllers(bool force_pio);
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void enumerate_controllers(bool force_pio, bool nvme_poll);
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void enumerate_storage_devices();
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void enumerate_disk_partitions();
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