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Kernel: Move VirtIO code away from using a scatter gather list
Currently, when passing buffers into VirtIOQueues, we use scatter-gather lists, which contain an internal vector of buffers. This vector is allocated, filled and the destroy whenever we try to provide buffers into a virtqueue, which would happen a lot in performance cricital code (the main transport mechanism for certain paravirtualized devices). This commit moves it over to using VirtIOQueueChains and building the chain in place in the VirtIOQueue. Also included are a bunch of fixups for the VirtIO Console device, making it use an internal VM::RingBuffer instead.
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13d5cdcd08
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11 changed files with 312 additions and 159 deletions
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@ -7,6 +7,7 @@
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#pragma once
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/VM/RingBuffer.h>
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#include <Kernel/VirtIO/VirtIO.h>
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namespace Kernel {
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@ -25,6 +26,7 @@ public:
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virtual ~VirtIOConsole() override;
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private:
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constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
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virtual const char* class_name() const override { return m_class_name.characters(); }
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virtual bool can_read(const FileDescription&, size_t) const override;
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@ -38,8 +40,8 @@ private:
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virtual String device_name() const override { return String::formatted("hvc{}", minor()); }
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virtual void handle_queue_update(u16 queue_index) override;
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OwnPtr<Region> m_receive_region;
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OwnPtr<Region> m_transmit_region;
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OwnPtr<RingBuffer> m_receive_buffer;
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OwnPtr<RingBuffer> m_transmit_buffer;
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static unsigned next_device_id;
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};
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