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use std::collections::HashMap;
use std::sync::{
atomic::{AtomicBool, Ordering},
Arc,
};
use drm::control::{connector, crtc, Device as ControlDevice};
use super::DrmDeviceFd;
use crate::backend::drm::error::{AccessError, Error};
use crate::utils::DevPath;
use tracing::{debug, error, info_span, trace};
#[derive(Debug)]
pub struct LegacyDrmDevice {
pub(crate) fd: DrmDeviceFd,
pub(crate) active: Arc<AtomicBool>,
old_state: HashMap<crtc::Handle, (crtc::Info, Vec<connector::Handle>)>,
pub(super) span: tracing::Span,
}
impl LegacyDrmDevice {
pub fn new(fd: DrmDeviceFd, active: Arc<AtomicBool>, disable_connectors: bool) -> Result<Self, Error> {
let span = info_span!("drm_legacy");
let mut dev = LegacyDrmDevice {
fd,
active,
old_state: HashMap::new(),
span,
};
let _guard = dev.span.enter();
// Enumerate (and save) the current device state.
// We need to keep the previous device configuration to restore the state later,
// so we query everything, that we can set.
let res_handles = dev.fd.resource_handles().map_err(|source| {
Error::Access(AccessError {
errmsg: "Error loading drm resources",
dev: dev.fd.dev_path(),
source,
})
})?;
for &con in res_handles.connectors() {
let con_info = dev.fd.get_connector(con, false).map_err(|source| {
Error::Access(AccessError {
errmsg: "Error loading connector info",
dev: dev.fd.dev_path(),
source,
})
})?;
if let Some(enc) = con_info.current_encoder() {
let enc_info = dev.fd.get_encoder(enc).map_err(|source| {
Error::Access(AccessError {
errmsg: "Error loading encoder info",
dev: dev.fd.dev_path(),
source,
})
})?;
if let Some(crtc) = enc_info.crtc() {
let info = dev.fd.get_crtc(crtc).map_err(|source| {
Error::Access(AccessError {
errmsg: "Error loading crtc info",
dev: dev.fd.dev_path(),
source,
})
})?;
dev.old_state
.entry(crtc)
.or_insert((info, Vec::new()))
.1
.push(con);
}
}
}
// If the user does not explicitly requests us to skip this,
// we clear out the complete connector<->crtc mapping on device creation.
//
// The reason is, that certain operations may be racy otherwise, as surfaces can
// exist on different threads. As a result, we cannot enumerate the current state
// on surface creation (it might be changed on another thread during the enumeration).
// An easy workaround is to set a known state on device creation.
if disable_connectors {
debug!("Resetting drm device to known state");
dev.reset_state()?;
}
drop(_guard);
Ok(dev)
}
pub(super) fn reset_state(&self) -> Result<(), Error> {
let res_handles = self.fd.resource_handles().map_err(|source| {
Error::Access(AccessError {
errmsg: "Failed to query resource handles",
dev: self.fd.dev_path(),
source,
})
})?;
set_connector_state(&self.fd, res_handles.connectors().iter().copied(), false)?;
for crtc in res_handles.crtcs() {
#[allow(deprecated)]
let _ = self
.fd
.set_cursor(*crtc, Option::<&drm::control::dumbbuffer::DumbBuffer>::None);
// null commit (necessary to trigger removal on the kernel side with the legacy api.)
self.fd
.set_crtc(*crtc, None, (0, 0), &[], None)
.map_err(|source| {
Error::Access(AccessError {
errmsg: "Error setting crtc",
dev: self.fd.dev_path(),
source,
})
})?;
}
Ok(())
}
}
impl Drop for LegacyDrmDevice {
fn drop(&mut self) {
if self.active.load(Ordering::SeqCst) {
let _guard = self.span.enter();
// Here we restore the tty to it's previous state.
// In case e.g. getty was running on the tty sets the correct framebuffer again,
// so that getty will be visible.
// We do exit correctly, if this fails, but the user will be presented with
// a black screen, if no display handler takes control again.
debug!("Device still active, trying to restore previous state");
for (handle, (info, connectors)) in self.old_state.drain() {
trace!(
framebuffer = ?info.framebuffer(),
offset = ?info.position(),
?connectors,
mode = ?info.mode(),
"Resetting crtc {:?}",
handle,
);
if let Err(err) = self.fd.set_crtc(
handle,
info.framebuffer(),
info.position(),
&connectors,
info.mode(),
) {
error!("Failed to reset crtc ({:?}). Error: {}", handle, err);
}
}
}
}
}
pub fn set_connector_state<D>(
dev: &D,
connectors: impl Iterator<Item = connector::Handle>,
enabled: bool,
) -> Result<(), Error>
where
D: DevPath + ControlDevice,
{
// for every connector...
for conn in connectors {
let info = dev.get_connector(conn, false).map_err(|source| {
Error::Access(AccessError {
errmsg: "Failed to get connector infos",
dev: dev.dev_path(),
source,
})
})?;
// that is currently connected ...
if info.state() == connector::State::Connected {
// get a list of it's properties.
let props = dev.get_properties(conn).map_err(|source| {
Error::Access(AccessError {
errmsg: "Failed to get properties for connector",
dev: dev.dev_path(),
source,
})
})?;
let (handles, _) = props.as_props_and_values();
// for every handle ...
for handle in handles {
// get information of that property
let info = dev.get_property(*handle).map_err(|source| {
Error::Access(AccessError {
errmsg: "Failed to get property of connector",
dev: dev.dev_path(),
source,
})
})?;
// to find out, if we got the handle of the "DPMS" property ...
if info.name().to_str().map(|x| x == "DPMS").unwrap_or(false) {
// so we can use that to turn on / off the connector
trace!(connector = ?conn, "Setting DPMS {}", enabled);
dev.set_property(
conn,
*handle,
if enabled {
drm_ffi::DRM_MODE_DPMS_ON.into()
} else {
drm_ffi::DRM_MODE_DPMS_OFF.into()
},
)
.map_err(|source| {
Error::Access(AccessError {
errmsg: "Failed to set property of connector",
dev: dev.dev_path(),
source,
})
})?;
}
}
}
}
Ok(())
}