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Kernel/VirtIO: Remove lazy allocation of VirtIO::Device BAR regions

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This fixes a Kernel Panic where the lazy allocation triggers inside an
ISR and grabs a mutex, which isn't allowed when interrupts are
disabled. This also fixes a bug where the mapping for VirtIO device
BARs is never allocated. #9876
This commit is contained in:
Sahan Fernando 2021-09-18 18:54:31 +10:00 committed by Idan Horowitz
parent 6b03d18d95
commit 2e079c6d69
Notes: sideshowbarker 2024-07-18 03:41:18 +09:00 
Author: https://github.com/ccapitalK
Commit: https://github.com/SerenityOS/serenity/commit/2e079c6d69c
Pull-request: https://github.com/SerenityOS/serenity/pull/10117
Issue: https://github.com/SerenityOS/serenity/issues/9876
Reviewed-by: https://github.com/IdanHo ✅
Reviewed-by: https://github.com/alimpfard
1 changed files with 13 additions and 11 deletions
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24
Kernel/Bus/VirtIO/Device.cpp
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@ -125,6 +125,18 @@ UNMAP_AFTER_INIT void Device::initialize()
}
if (m_use_mmio) {
for (auto& cfg : m_configs) {
auto& mapping = m_mmio[cfg.bar];
mapping.size = PCI::get_BAR_space_size(pci_address(), cfg.bar);
if (!mapping.base && mapping.size) {
auto region_or_error = MM.allocate_kernel_region(PhysicalAddress(page_base_of(PCI::get_BAR(pci_address(), cfg.bar))), Memory::page_round_up(mapping.size), "VirtIO MMIO", Memory::Region::Access::ReadWrite, Memory::Region::Cacheable::No);
if (region_or_error.is_error()) {
dbgln_if(VIRTIO_DEBUG, "{}: Failed to map bar {} - (size={}) {}", VirtIO::determine_device_class(pci_address()), cfg.bar, mapping.size, region_or_error.error());
} else {
mapping.base = region_or_error.release_value();
}
}
}
m_common_cfg = get_config(ConfigurationType::Common, 0);
m_notify_cfg = get_config(ConfigurationType::Notify, 0);
m_isr_cfg = get_config(ConfigurationType::ISR, 0);
@ -147,17 +159,7 @@ UNMAP_AFTER_INIT VirtIO::Device::Device(PCI::Address address)
auto Device::mapping_for_bar(u8 bar) -> MappedMMIO&
{
VERIFY(m_use_mmio);
auto& mapping = m_mmio[bar];
if (!mapping.base && mapping.size) {
auto region_or_error = MM.allocate_kernel_region(PhysicalAddress(page_base_of(PCI::get_BAR(pci_address(), bar))), Memory::page_round_up(mapping.size), "VirtIO MMIO", Memory::Region::Access::ReadWrite, Memory::Region::Cacheable::No);
if (region_or_error.is_error()) {
dbgln("{}: Failed to map bar {} - (size={}) {}", VirtIO::determine_device_class(pci_address()), bar, mapping.size, region_or_error.error());
} else {
mapping.size = PCI::get_BAR_space_size(pci_address(), bar);
mapping.base = region_or_error.release_value();
}
}
return mapping;
return m_mmio[bar];
}
void Device::notify_queue(u16 queue_index)