szafonimateusz-mi opened a new pull request, #13391:
URL: https://github.com/apache/nuttx/pull/13391
## Summary
- drivers/pci: add MSI/MSI-X support
Add support for MSI and MSI-X in PCI framework
- arch/x86_64/intel64: add MSI/MSI-X support
Add MSI and MSI-X support for intel64
- drivers/pci_qemu_edu: add MSI test
Add simple MSI test for QEMU PCI EDU device so we can verify if MSI
works correctly
## Impact
## Testing
Tested with QEMU and PCI EDU device:
```
qemu-system-x86_64 -m 2048M -cpu host -enable-kvm -kernel nuttx.elf
-nographic -serial mon:stdio -device edu -device pci-testdev
```
QEMU EDU device MSI test fragment:
```
pci_qemu_edu_probe: MSI TEST
pci_qemu_edu_probe: MSI TEST: Attaching MSI 64 to 0x100917277
pci_qemu_edu_test_intx: Identification: 0x010000edu
pci_qemu_edu_test_intx: Triggering interrupt with value 0xdeadbeef
pci_qemu_edu_interrupt: Received value: 0xdeadbeef
pci_qemu_edu_test_intx: TEST PASS
pci_qemu_edu_test_intx: Computing factorial of 5
pci_qemu_edu_interrupt: Computed factorial: 120
pci_qemu_edu_test_intx: TEST PASS
pci_qemu_edu_interrupt: Received value: 0x00000005
pci_qemu_edu_test_intx: TEST PASS
pci_qemu_edu_test_dma: Identification: 0x010000edu
pci_qemu_edu_test_dma: Test block checksum 0xb4908b8a
EDU: clamping DMA 0x00000001015648d0 to 0x00000000015648d0!
pci_qemu_edu_interrupt: DMA transfer complete
pci_qemu_edu_test_dma: DMA transfer to device complete.
EDU: clamping DMA 0x00000001015648d0 to 0x00000000015648d0!
pci_qemu_edu_interrupt: DMA transfer complete
pci_qemu_edu_test_dma: DMA transfer from device complete.
pci_qemu_edu_test_dma: Received block checksum 0xb4908b8a
pci_qemu_edu_test_dma: TEST PASS
```
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