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kern: support dynamic resource expansion for system heaps/events/sessions.

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Michael Scire 2021-09-17 22:01:58 -07:00 • committed by SciresM
parent 2b91956051
commit 2c4bd44d7e
37 changed files with 856 additions and 328 deletions
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22
libraries/libmesosphere/source/svc/kern_svc_event.cpp
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@ -60,12 +60,28 @@ namespace ams::kern::svc {
auto &process = GetCurrentProcess();
auto &handle_table = process.GetHandleTable();
/* Declare the event we're going to allocate. */
KEvent *event;
/* Reserve a new event from the process resource limit. */
KScopedResourceReservation event_reservation(std::addressof(process), ams::svc::LimitableResource_EventCountMax);
R_UNLESS(event_reservation.Succeeded(), svc::ResultLimitReached());
if (event_reservation.Succeeded()) {
/* Allocate an event normally. */
event = KEvent::Create();
} else {
/* We couldn't reserve an event. Check that we support dynamically expanding the resource limit. */
R_UNLESS(process.GetResourceLimit() == std::addressof(Kernel::GetSystemResourceLimit()), svc::ResultLimitReached());
R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), svc::ResultLimitReached());
/* Create a new event. */
KEvent *event = KEvent::Create();
/* Try to allocate an event from unused slab memory. */
event = KEvent::CreateFromUnusedSlabMemory();
R_UNLESS(event != nullptr, svc::ResultLimitReached());
/* We successfully allocated an event, so add the object we allocated to the resource limit. */
Kernel::GetSystemResourceLimit().Add(ams::svc::LimitableResource_EventCountMax, 1);
}
/* Check that we successfully created an event. */
R_UNLESS(event != nullptr, svc::ResultOutOfResource());
/* Initialize the event. */