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vfio_user: Make GPIO device more interesting

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Every third read on the GPIO pin will return 1 and also trigger an
interrupt in the guest.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2023-02-15 17:52:11 +00:00 committed by Bo Chen
parent c8967fcc37
commit 1181fd21fd
1 changed files with 29 additions and 5 deletions
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34
vfio_user/examples/gpio/main.rs
View File

@ -6,11 +6,12 @@
use argh::FromArgs;
use log::info;
use pci::PciBarConfiguration;
use std::{fs::File, mem::size_of, path::PathBuf};
use std::{fs::File, io::Write, mem::size_of, num::Wrapping, path::PathBuf};
use vfio_bindings::bindings::vfio::{
vfio_region_info, VFIO_IRQ_INFO_EVENTFD, VFIO_PCI_BAR2_REGION_INDEX,
VFIO_PCI_CONFIG_REGION_INDEX, VFIO_PCI_INTX_IRQ_INDEX, VFIO_PCI_NUM_IRQS, VFIO_PCI_NUM_REGIONS,
VFIO_REGION_INFO_FLAG_READ, VFIO_REGION_INFO_FLAG_WRITE,
vfio_region_info, VFIO_IRQ_INFO_EVENTFD, VFIO_IRQ_SET_ACTION_TRIGGER,
VFIO_IRQ_SET_DATA_EVENTFD, VFIO_PCI_BAR2_REGION_INDEX, VFIO_PCI_CONFIG_REGION_INDEX,
VFIO_PCI_INTX_IRQ_INDEX, VFIO_PCI_NUM_IRQS, VFIO_PCI_NUM_REGIONS, VFIO_REGION_INFO_FLAG_READ,
VFIO_REGION_INFO_FLAG_WRITE,
};
use vfio_user::{IrqInfo, Server, ServerBackend};
@ -35,6 +36,8 @@ struct Args {
struct TestBackend {
configuration: pci::PciConfiguration,
irq: Option<File>,
count: Wrapping<u8>,
}
impl TestBackend {
@ -65,7 +68,11 @@ impl TestBackend {
.unwrap();
configuration.set_irq(1, pci::PciInterruptPin::IntA);
TestBackend { configuration }
TestBackend {
configuration,
irq: None,
count: Wrapping(0),
}
}
}
@ -83,6 +90,16 @@ impl ServerBackend for TestBackend {
let v = self.configuration.read_config_register(reg_idx);
let reg_offset = offset as usize % 4;
data.copy_from_slice(&v.to_le_bytes()[reg_offset..reg_offset + data.len()]);
} else if region == VFIO_PCI_BAR2_REGION_INDEX && offset == 0 {
info!("gpio value read: count = {}", self.count);
self.count += 1;
if self.count.0 % 3 == 0 {
data[0] = 1;
if let Some(irq) = &mut self.irq {
info!("Triggering interrupt for count = {}", self.count);
irq.write_all(&1u64.to_le_bytes()).unwrap();
}
}
}
Ok(())
@ -139,6 +156,13 @@ impl ServerBackend for TestBackend {
fds: Vec<File>,
) -> Result<(), std::io::Error> {
info!("set_irqs index = {index} flags = {flags} start = {start} count = {count} fds = {fds:?}");
if flags & (VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER) > 0 {
if count == 1 {
self.irq = Some(fds[0].try_clone().unwrap());
} else {
self.irq = None;
}
}
Ok(())
}
}