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Kernel/AHCI: Simplify wait and timeout pattern significantly

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Instead of repeating ourselves with the pattern of waiting for some
condition to be met, we can have a general method for this task,
and then we can provide the retry count, the required delay and a lambda
function for the checked condition.
This commit is contained in:
Liav A 2021-11-13 14:20:48 +02:00 committed by Andreas Kling
parent 557351724a
commit 0e5983e603
Notes: sideshowbarker 2024-07-18 01:10:34 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/0e5983e6033
Pull-request: https://github.com/SerenityOS/serenity/pull/10902
2 changed files with 26 additions and 22 deletions
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46
Kernel/Storage/ATA/AHCIPort.cpp
View File

@ -405,14 +405,11 @@ void AHCIPort::rebase()
stop_command_list_processing();
stop_fis_receiving();
full_memory_barrier();
size_t retry = 0;
// Try to wait 1 second for HBA to clear Command List Running and FIS Receive Running
while (retry < 1000) {
if (!(m_port_registers.cmd & (1 << 15)) && !(m_port_registers.cmd & (1 << 14)))
break;
IO::delay(1000);
retry++;
}
wait_until_condition_met_or_timeout(1000, 1000, [this]() -> bool {
return !(m_port_registers.cmd & (1 << 15)) && !(m_port_registers.cmd & (1 << 14));
});
full_memory_barrier();
m_port_registers.clbu = 0;
m_port_registers.clb = m_command_list_page->paddr().get();
@ -690,6 +687,17 @@ bool AHCIPort::identify_device()
return success;
}
void AHCIPort::wait_until_condition_met_or_timeout(size_t delay_in_microseconds, size_t retries, Function<bool(void)> condition_being_met) const
{
size_t retry = 0;
while (retry < retries) {
if (condition_being_met())
break;
IO::delay(delay_in_microseconds);
retry++;
}
}
bool AHCIPort::shutdown()
{
MutexLocker locker(m_lock);
@ -786,15 +794,13 @@ bool AHCIPort::initiate_sata_reset()
dbgln_if(AHCI_DEBUG, "AHCI Port {}: Initiate SATA reset", representative_port_index());
stop_command_list_processing();
full_memory_barrier();
size_t retry = 0;
// Note: The AHCI specification says to wait now a 500 milliseconds
// Try to wait 1 second for HBA to clear Command List Running
while (retry < 5000) {
if (!(m_port_registers.cmd & (1 << 15)))
break;
// The AHCI specification says to wait now a 500 milliseconds
IO::delay(100);
retry++;
}
wait_until_condition_met_or_timeout(100, 5000, [this]() -> bool {
return !(m_port_registers.cmd & (1 << 15));
});
full_memory_barrier();
spin_up();
full_memory_barrier();
@ -804,14 +810,10 @@ bool AHCIPort::initiate_sata_reset()
full_memory_barrier();
set_interface_state(AHCI::DeviceDetectionInitialization::NoActionRequested);
full_memory_barrier();
retry = 0;
while (retry < 1000) {
if (is_phy_enabled())
break;
IO::delay(10);
retry++;
}
wait_until_condition_met_or_timeout(10, 1000, [this]() -> bool {
return is_phy_enabled();
});
dmesgln("AHCI Port {}: {}", representative_port_index(), try_disambiguate_sata_status());

2
Kernel/Storage/ATA/AHCIPort.h
View File

@ -99,6 +99,8 @@ private:
ALWAYS_INLINE bool is_interface_disabled() const { return (m_port_registers.ssts & 0xf) == 4; };
ALWAYS_INLINE void wait_until_condition_met_or_timeout(size_t delay_in_microseconds, size_t retries, Function<bool(void)> condition_being_met) const;
// Data members
EntropySource m_entropy_source;