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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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12
Kernel/Storage/AHCIPortHandler.cpp
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@ -24,6 +24,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/CommandLine.h>
#include <Kernel/Storage/AHCIPortHandler.h>
namespace Kernel {
@ -46,10 +47,19 @@ AHCIPortHandler::AHCIPortHandler(AHCIController& controller, u8 irq, AHCI::Maske
// Clear pending interrupts, if there are any!
m_pending_ports_interrupts.set_all();
enable_irq();
if (kernel_command_line().ahci_reset_mode() == AHCIResetMode::Complete) {
for (auto index : taken_ports.to_vector()) {
auto port = AHCIPort::create(*this, static_cast<volatile AHCI::PortRegisters&>(controller.hba().port_regs[index]), index);
m_handled_ports.set(index, port);
port->reset();
}
return;
}
for (auto index : taken_ports.to_vector()) {
auto port = AHCIPort::create(*this, static_cast<volatile AHCI::PortRegisters&>(controller.hba().port_regs[index]), index);
m_handled_ports.set(index, port);
port->reset();
port->initialize_without_reset();
}
}