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Kernel/Storage: Implement basic AHCI hotplug support

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This is really a basic support for AHCI hotplug events, so we know how
to add a node representing the device in /sys/dev/block and removing it
according to the event type (insertion/removal).

This change doesn't take into account what happens if the device was
mounted or a read/write operation is being handled.

For this to work correctly, StorageManagement now uses the Singleton
container, as it might be accessed simultaneously from many CPUs
for hotplug events. DiskPartition holds a WeakPtr instead of a RefPtr,
to allow removal of a StorageDevice object from the heap.
StorageDevices are now stored and being referenced to via an
IntrusiveList to make it easier to remove them on hotplug event.

In future changes, all of the stated above might change, but for now,
this commit represents the least amount of changes to make everything
to work correctly.
This commit is contained in:
Liav A 2021-08-27 08:08:43 +03:00 • committed by Andreas Kling
parent 74c4c864bd
commit fb7b4caa57
11 changed files with 96 additions and 61 deletions
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7
Kernel/Storage/StorageDevice.h
View file

@ -6,6 +6,7 @@
#pragma once
#include <AK/IntrusiveList.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Locking/Mutex.h>
@ -16,7 +17,6 @@ namespace Kernel {
class StorageDevice : public BlockDevice {
friend class StorageManagement;
AK_MAKE_ETERNAL
public:
virtual u64 max_addressable_block() const { return m_max_addressable_block; }
@ -32,6 +32,10 @@ public:
// FIXME: This is being used only during early boot, find a better way to find devices...
virtual String storage_name() const = 0;
virtual void prepare_for_unplug() { m_partitions.clear(); }
NonnullRefPtrVector<DiskPartition> partitions() const { return m_partitions; }
protected:
StorageDevice(const StorageController&, size_t, u64);
StorageDevice(const StorageController&, int, int, size_t, u64);
@ -39,6 +43,7 @@ protected:
virtual StringView class_name() const override;
private:
mutable IntrusiveListNode<StorageDevice, RefPtr<StorageDevice>> m_list_node;
NonnullRefPtr<StorageController> m_storage_controller;
NonnullRefPtrVector<DiskPartition> m_partitions;
u64 m_max_addressable_block;