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Kernel: Don't reset AHCI ports during boot unless requested

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Instead of blindly resetting every AHCI port, let's just reset only the
controller by default. The user can still request to reset everything
with a new kernel boot argument called ahci_reset_mode which is set
by default to "controller", so the code will only invoke an HBA reset.

This kernel boot argument can be set to 3 different values:
1. "controller" - reset the HBA and skip resetting AHCI ports
2. "none" - don't reset anything, so we rely on the firmware to
initialize the AHCI HBA and ports for us.
3. "complete" - reset the AHCI HBA and ports.
This commit is contained in:
Liav A 2021-03-12 18:35:16 +02:00 • committed by Andreas Kling
parent a93dc8c8c9
commit 793d315994
6 changed files with 58 additions and 5 deletions
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13
Kernel/CommandLine.cpp
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@ -148,6 +148,19 @@ UNMAP_AFTER_INIT HPETMode CommandLine::hpet_mode() const
PANIC("Unknown HPETMode: {}", hpet_mode);
}
UNMAP_AFTER_INIT AHCIResetMode CommandLine::ahci_reset_mode() const
{
const auto ahci_reset_mode = lookup("ahci_reset_mode").value_or("controller");
if (ahci_reset_mode == "controller") {
return AHCIResetMode::ControllerOnly;
} else if (ahci_reset_mode == "none") {
return AHCIResetMode::None;
} else if (ahci_reset_mode == "complete") {
return AHCIResetMode::Complete;
}
PANIC("Unknown AHCIResetMode: {}", ahci_reset_mode);
}
UNMAP_AFTER_INIT BootMode CommandLine::boot_mode() const
{
const auto boot_mode = lookup("boot_mode").value_or("graphical");