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Kernel: Add polling support to NVMe

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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`.
This commit is contained in:
Pankaj Raghav 2022-01-27 16:44:58 +05:30 • committed by Andreas Kling
parent aa832ee251
commit d234e6b801
13 changed files with 211 additions and 83 deletions
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1
Kernel/Storage/NVMe/NVMeDefinitions.h
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@ -125,6 +125,7 @@ enum IOCommandOpcode {
// FLAGS
static constexpr u8 QUEUE_PHY_CONTIGUOUS = (1 << 0);
static constexpr u8 QUEUE_IRQ_ENABLED = (1 << 1);
static constexpr u8 QUEUE_IRQ_DISABLED = (0 << 1);
struct [[gnu::packed]] NVMeCompletion {
LittleEndian<u32> cmd_spec;