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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.