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Kernel/AHCI: Dont assume ports start at 0

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This fixes a bug that occurs when the controller's ports are not
(internally) numbered sequentially.
This is done by checking the bits set in PI.
This bug was found on bare-metal, on a laptop with 1 Port that
was reported as port 4.
This commit is contained in:
Alexander 2021-06-25 15:49:33 +02:00 committed by Andreas Kling
parent e9b7d58d10
commit 2b4cab284c
Notes: sideshowbarker 2024-07-18 11:32:55 +09:00 
Author: https://github.com/ElectrodeYT
Commit: https://github.com/SerenityOS/serenity/commit/2b4cab284c1
Pull-request: https://github.com/SerenityOS/serenity/pull/8244
Reviewed-by: https://github.com/IdanHo
1 changed files with 8 additions and 2 deletions
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10
Kernel/Storage/AHCIController.cpp
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@ -181,12 +181,18 @@ RefPtr<StorageDevice> AHCIController::device_by_port(u32 port_index) const
RefPtr<StorageDevice> AHCIController::device(u32 index) const
{
NonnullRefPtrVector<StorageDevice> connected_devices;
for (size_t index = 0; index < capabilities().ports_count; index++) {
auto checked_device = device_by_port(index);
u32 pi = hba().control_regs.pi;
u32 bit = __builtin_ffsl(pi);
while (bit) {
dbgln_if(AHCI_DEBUG, "Checking implemented port {}, pi {:b}", bit - 1, pi);
pi &= ~(1u << (bit - 1));
auto checked_device = device_by_port(bit - 1);
bit = __builtin_ffsl(pi);
if (checked_device.is_null())
continue;
connected_devices.append(checked_device.release_nonnull());
}
dbgln_if(AHCI_DEBUG, "Connected device count: {}, Index: {}", connected_devices.size(), index);
if (index >= connected_devices.size())
return nullptr;
return connected_devices[index];