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kms: New backend

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New backend utilizing a thread per surface for precise frame
scheduling.
This commit is contained in:
Victoria Brekenfeld 2024-06-07 20:04:39 +02:00 • committed by Victoria Brekenfeld
parent 3b7bba3add
commit 469a366207
24 changed files with 3219 additions and 1958 deletions
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20
src/backend/kms/drm_helpers.rs
View file

@ -14,12 +14,13 @@ use std::{collections::HashMap, ops::Range};
pub fn display_configuration(
device: &mut impl ControlDevice,
supports_atomic: bool,
) -> Result<HashMap<connector::Handle, crtc::Handle>> {
) -> Result<HashMap<connector::Handle, Option<crtc::Handle>>> {
let res_handles = device.resource_handles()?;
let connectors = res_handles.connectors();
let mut map = HashMap::new();
let mut cleanup = Vec::new();
// We expect the previous running drm master (likely the login mananger)
// to leave the drm device in a sensible state.
// That means, to reduce flickering, we try to keep an established mapping.
@ -31,7 +32,7 @@ pub fn display_configuration(
if let Some(crtc) = device.get_encoder(enc)?.crtc() {
// If is is connected we found a mapping
if conn.state() == ConnectorState::Connected {
map.insert(conn.handle(), crtc);
map.insert(conn.handle(), Some(crtc));
// If not, the user just unplugged something,
// or the drm master did not cleanup?
// Well, I guess we cleanup after them.
@ -41,6 +42,7 @@ pub fn display_configuration(
}
}
}
// But just in case we try to match all remaining connectors.
for conn in connectors
.iter()
@ -56,12 +58,16 @@ pub fn display_configuration(
.flat_map(|encoder_handle| device.get_encoder(*encoder_handle))
{
for crtc in res_handles.filter_crtcs(encoder_info.possible_crtcs()) {
if !map.values().any(|v| *v == crtc) {
map.insert(conn.handle(), crtc);
if !map.values().any(|v| *v == Some(crtc)) {
map.insert(conn.handle(), Some(crtc));
break 'outer;
}
}
}
if !map.contains_key(&conn.handle()) {
map.insert(conn.handle(), None);
}
}
// And then cleanup
@ -119,9 +125,11 @@ pub fn display_configuration(
device.atomic_commit(AtomicCommitFlags::ALLOW_MODESET, req)?;
} else {
for crtc in cleanup {
for crtc in res_handles.crtcs() {
#[allow(deprecated)]
let _ = device.set_cursor(crtc, Option::<&DumbBuffer>::None);
let _ = device.set_cursor(*crtc, Option::<&DumbBuffer>::None);
}
for crtc in cleanup {
// null commit (necessary to trigger removal on the kernel side with the legacy api.)
let _ = device.set_crtc(crtc, None, (0, 0), &[], None);
}