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add platform interrupt

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This commit is contained in:
Pascal Bauer 2024-08-26 13:02:45 +02:00
parent a95dbea997
commit b38096e707
2 changed files with 47 additions and 0 deletions
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2
common/include/villas/kernel/vfio_device.hpp
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@ -49,6 +49,8 @@ public:
// Get the size of a device memory region
size_t regionGetSize(size_t index);
int platformInterruptInit(int efds[32]);
// Enable memory accesses and bus mastering for PCI device
bool pciEnable();

45
common/lib/kernel/vfio_device.cpp
View file

@ -247,6 +247,51 @@ bool Device::pciEnable() {
return true;
}
int Device::platformInterruptInit(int efds[]){
size_t efd_cnt = 0; // FIXME: efds currently has a fixed size of 32. But we don't check that and there may be more efds.
for (auto irq : irqs) {
const size_t irqCount = irq.count;
const size_t irqSetSize =
sizeof(struct vfio_irq_set) + sizeof(int) * irqCount;
auto *irqSetBuf = new char[irqSetSize];
if (!irqSetBuf)
throw MemoryAllocationError();
auto *irqSet = reinterpret_cast<struct vfio_irq_set *>(irqSetBuf);
irqSet->argsz = irqSetSize;
// DATA_EVENTFD binds the interrupt to the provided eventfd.
// SET_ACTION_TRIGGER enables kernel->userspace signalling.
irqSet->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
irqSet->index = irq.index;
irqSet->start = 0;
irqSet->count = irqCount;
// Now set the new eventfds
for (size_t i = 0; i < irqCount; i++) {
efds[efd_cnt+i] = eventfd(0, 0);
if (efds[efd_cnt+i] < 0) {
delete[] irqSetBuf;
return -1;
}
eventfdList.push_back(efds[efd_cnt+i]);
}
memcpy(irqSet->data, efds+efd_cnt, sizeof(int) * irqCount);
if (ioctl(fd, VFIO_DEVICE_SET_IRQS, irqSet) != 0) {
delete[] irqSetBuf;
return -1;
}
delete[] irqSetBuf;
efd_cnt += irqCount;
}
return efd_cnt;
}
int Device::pciMsiInit(int efds[]) {
// Check if this is really a vfio-pci device
if (not isVfioPciDevice())