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// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "core/core_timing.h"
#include "core/hle/kernel/k_resource_limit.h"
#include "core/hle/kernel/svc_results.h"
namespace Kernel {
constexpr s64 DefaultTimeout = 10000000000; // 10 seconds
KResourceLimit::KResourceLimit(KernelCore& kernel_)
: KAutoObjectWithSlabHeapAndContainer{kernel_}, lock{kernel_}, cond_var{kernel_} {}
KResourceLimit::~KResourceLimit() = default;
void KResourceLimit::Initialize(const Core::Timing::CoreTiming* core_timing_) {
core_timing = core_timing_;
}
void KResourceLimit::Finalize() {}
s64 KResourceLimit::GetLimitValue(LimitableResource which) const {
const auto index = static_cast<std::size_t>(which);
s64 value{};
{
KScopedLightLock lk{lock};
value = limit_values[index];
ASSERT(value >= 0);
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
}
return value;
}
s64 KResourceLimit::GetCurrentValue(LimitableResource which) const {
const auto index = static_cast<std::size_t>(which);
s64 value{};
{
KScopedLightLock lk{lock};
value = current_values[index];
ASSERT(value >= 0);
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
}
return value;
}
s64 KResourceLimit::GetPeakValue(LimitableResource which) const {
const auto index = static_cast<std::size_t>(which);
s64 value{};
{
KScopedLightLock lk{lock};
value = peak_values[index];
ASSERT(value >= 0);
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
}
return value;
}
s64 KResourceLimit::GetFreeValue(LimitableResource which) const {
const auto index = static_cast<std::size_t>(which);
s64 value{};
{
KScopedLightLock lk(lock);
ASSERT(current_values[index] >= 0);
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
value = limit_values[index] - current_values[index];
}
return value;
}
ResultCode KResourceLimit::SetLimitValue(LimitableResource which, s64 value) {
const auto index = static_cast<std::size_t>(which);
KScopedLightLock lk(lock);
R_UNLESS(current_values[index] <= value, ResultInvalidState);
limit_values[index] = value;
return ResultSuccess;
}
bool KResourceLimit::Reserve(LimitableResource which, s64 value) {
return Reserve(which, value, core_timing->GetGlobalTimeNs().count() + DefaultTimeout);
}
bool KResourceLimit::Reserve(LimitableResource which, s64 value, s64 timeout) {
ASSERT(value >= 0);
const auto index = static_cast<std::size_t>(which);
KScopedLightLock lk(lock);
ASSERT(current_hints[index] <= current_values[index]);
if (current_hints[index] >= limit_values[index]) {
return false;
}
// Loop until we reserve or run out of time.
while (true) {
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
// If we would overflow, don't allow to succeed.
if (current_values[index] + value <= current_values[index]) {
break;
}
if (current_values[index] + value <= limit_values[index]) {
current_values[index] += value;
current_hints[index] += value;
peak_values[index] = std::max(peak_values[index], current_values[index]);
return true;
}
if (current_hints[index] + value <= limit_values[index] &&
(timeout < 0 || core_timing->GetGlobalTimeNs().count() < timeout)) {
waiter_count++;
cond_var.Wait(&lock, timeout);
waiter_count--;
} else {
break;
}
}
return false;
}
void KResourceLimit::Release(LimitableResource which, s64 value) {
Release(which, value, value);
}
void KResourceLimit::Release(LimitableResource which, s64 value, s64 hint) {
ASSERT(value >= 0);
ASSERT(hint >= 0);
const auto index = static_cast<std::size_t>(which);
KScopedLightLock lk(lock);
ASSERT(current_values[index] <= limit_values[index]);
ASSERT(current_hints[index] <= current_values[index]);
ASSERT(value <= current_values[index]);
ASSERT(hint <= current_hints[index]);
current_values[index] -= value;
current_hints[index] -= hint;
if (waiter_count != 0) {
cond_var.Broadcast();
}
}
} // namespace Kernel
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