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platform: be robust on IRQ creation failure

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In case invalid IRQ numbers are used (255 on x86), the IRQ session creation
request may be denied and the platform driver is killed because of the
uncatched exception, which must be avoided.

Issue #5406
This commit is contained in:
Alexander Boettcher 2025-01-15 11:16:55 +01:00 committed by Christian Helmuth
parent 91a58d3e98
commit 9239b36f05
1 changed files with 53 additions and 51 deletions
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104
repos/os/src/driver/platform/device_component.cc
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@ -152,64 +152,66 @@ Genode::Irq_session_capability Device_component::irq(unsigned idx)
return remapped_irq;
};
_irq_registry.for_each([&] (Irq & irq)
{
if (irq.idx != idx)
return;
try {
_irq_registry.for_each([&] (Irq & irq)
{
if (irq.idx != idx)
return;
if (!irq.shared && !irq.irq.constructed()) {
addr_t pci_cfg_addr = 0;
Pci::Bdf bdf { 0, 0, 0 };
if (irq.type != Irq_session::TYPE_LEGACY) {
if (_pci_config.constructed()) {
pci_cfg_addr = _pci_config->addr;
bdf = _pci_config->bdf;
if (!irq.shared && !irq.irq.constructed()) {
addr_t pci_cfg_addr = 0;
Pci::Bdf bdf { 0, 0, 0 };
if (irq.type != Irq_session::TYPE_LEGACY) {
if (_pci_config.constructed()) {
pci_cfg_addr = _pci_config->addr;
bdf = _pci_config->bdf;
} else
error("MSI(-x) detected for device without pci-config!");
irq.irq.construct(_env, irq.number, pci_cfg_addr, irq.type);
} else
error("MSI(-x) detected for device without pci-config!");
irq.irq.construct(_env, irq.number, irq.mode, irq.polarity);
irq.irq.construct(_env, irq.number, pci_cfg_addr, irq.type);
} else
irq.irq.construct(_env, irq.number, irq.mode, irq.polarity);
/**
* Core/Kernel is and remains in control of the IRQ controller. When
* IRQ remapping is enabled, however, we need to modify the upper 32bit
* of the corresponding redirection table entry. This is save for
* base-hw as it never touches the upper 32bit after the initial setup.
*/
Irq_session::Info info = irq.irq->info();
if (pci_cfg_addr && info.type == Irq_session::Info::MSI)
pci_msi_enable(_env, *this, pci_cfg_addr,
remapped_irq("", bdf, irq, info, Irq_config::Invalid()).session_info,
irq.type);
else
_session.irq_controller_registry().for_each([&] (Irq_controller & controller) {
if (!controller.handles_irq(irq.number)) return;
/**
* Core/Kernel is and remains in control of the IRQ controller. When
* IRQ remapping is enabled, however, we need to modify the upper 32bit
* of the corresponding redirection table entry. This is save for
* base-hw as it never touches the upper 32bit after the initial setup.
*/
Irq_session::Info info = irq.irq->info();
if (pci_cfg_addr && info.type == Irq_session::Info::MSI)
pci_msi_enable(_env, *this, pci_cfg_addr,
remapped_irq("", bdf, irq, info, Irq_config::Invalid()).session_info,
irq.type);
else
_session.irq_controller_registry().for_each([&] (Irq_controller & controller) {
if (!controller.handles_irq(irq.number)) return;
remapped_irq(controller.iommu(), controller.bdf(), irq, info,
controller.irq_config(irq.number));
controller.remap_irq(irq.number, irq.remapped_nbr);
});
}
remapped_irq(controller.iommu(), controller.bdf(), irq, info,
controller.irq_config(irq.number));
controller.remap_irq(irq.number, irq.remapped_nbr);
if (irq.shared && !irq.sirq.constructed())
_device_model.with_shared_irq(irq.number,
[&] (Shared_interrupt & sirq) {
irq.sirq.construct(_env.ep().rpc_ep(), sirq,
irq.mode, irq.polarity);
_session.irq_controller_registry().for_each([&] (Irq_controller & controller) {
if (!controller.handles_irq(irq.number)) return;
remapped_irq(controller.iommu(), controller.bdf(), irq,
{ Irq_session::Info::INVALID, 0, 0 },
controller.irq_config(irq.number));
controller.remap_irq(irq.number, irq.remapped_nbr);
});
});
}
if (irq.shared && !irq.sirq.constructed())
_device_model.with_shared_irq(irq.number,
[&] (Shared_interrupt & sirq) {
irq.sirq.construct(_env.ep().rpc_ep(), sirq,
irq.mode, irq.polarity);
_session.irq_controller_registry().for_each([&] (Irq_controller & controller) {
if (!controller.handles_irq(irq.number)) return;
remapped_irq(controller.iommu(), controller.bdf(), irq,
{ Irq_session::Info::INVALID, 0, 0 },
controller.irq_config(irq.number));
controller.remap_irq(irq.number, irq.remapped_nbr);
});
});
cap = irq.shared ? irq.sirq->cap() : irq.irq->cap();
});
cap = irq.shared ? irq.sirq->cap() : irq.irq->cap();
});
} catch (Service_denied) { error("irq could not be setup ", _device); }
return cap;
}