58 lines
1.7 KiB
Rust
58 lines
1.7 KiB
Rust
use {
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crate::{gfx_api::GfxContext, utils::oserror::OsError},
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byteorder::{NativeEndian, WriteBytesExt},
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std::{io::Write, rc::Rc},
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thiserror::Error,
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uapi::{c, OwnedFd},
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};
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pub struct DrmFeedback {
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pub fd: Rc<OwnedFd>,
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pub size: usize,
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pub indices: Vec<u16>,
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pub main_device: c::dev_t,
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}
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impl DrmFeedback {
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pub fn new(ctx: &dyn GfxContext) -> Result<Self, DrmFeedbackError> {
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let dev_t = uapi::fstat(ctx.gbm().drm.raw())
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.map_err(OsError::from)?
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.st_rdev;
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let data = create_fd_data(ctx);
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let mut memfd =
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uapi::memfd_create("drm_feedback", c::MFD_CLOEXEC | c::MFD_ALLOW_SEALING).unwrap();
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memfd.write_all(&data).unwrap();
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uapi::lseek(memfd.raw(), 0, c::SEEK_SET).unwrap();
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uapi::fcntl_add_seals(
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memfd.raw(),
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c::F_SEAL_SEAL | c::F_SEAL_GROW | c::F_SEAL_SHRINK | c::F_SEAL_WRITE,
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)
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.unwrap();
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let num_indices = data.len() / 16;
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let indices = (0..num_indices).map(|v| v as u16).collect();
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Ok(Self {
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fd: Rc::new(memfd),
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size: data.len(),
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indices,
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main_device: dev_t,
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})
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}
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}
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fn create_fd_data(ctx: &dyn GfxContext) -> Vec<u8> {
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let mut vec = vec![];
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for (format, info) in &*ctx.formats() {
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for modifier in info.modifiers.keys() {
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vec.write_u32::<NativeEndian>(*format).unwrap();
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vec.write_u32::<NativeEndian>(0).unwrap();
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vec.write_u64::<NativeEndian>(*modifier).unwrap();
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}
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}
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vec
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}
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#[derive(Debug, Error)]
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pub enum DrmFeedbackError {
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#[error("Could not stat drm device")]
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Stat(#[from] OsError),
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}
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