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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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4
Kernel/Storage/AHCIPort.h
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@ -78,9 +78,13 @@ public:
RefPtr<StorageDevice> connected_device() const { return m_connected_device; }
bool reset();
UNMAP_AFTER_INIT bool initialize_without_reset();
void handle_interrupt();
private:
bool is_phy_enabled() const { return (m_port_registers.ssts & 0xf) == 3; }
bool initialize();
UNMAP_AFTER_INIT AHCIPort(const AHCIPortHandler&, volatile AHCI::PortRegisters&, u32 port_index);
ALWAYS_INLINE void clear_sata_error_register() const;