gem.rs

 1// SPDX-License-Identifier: GPL-2.0
 2
 3use kernel::{
 4    drm,
 5    drm::{gem, gem::BaseObject},
 6    prelude::*,
 7    sync::aref::ARef,
 8};
 9
10use crate::{
11    driver::{NovaDevice, NovaDriver},
12    file::File,
13};
14
15/// GEM Object inner driver data
16#[pin_data]
17pub(crate) struct NovaObject {}
18
19impl gem::DriverObject for NovaObject {
20    type Driver = NovaDriver;
21
22    fn new(_dev: &NovaDevice, _size: usize) -> impl PinInit<Self, Error> {
23        try_pin_init!(NovaObject {})
24    }
25}
26
27impl NovaObject {
28    /// Create a new DRM GEM object.
29    pub(crate) fn new(dev: &NovaDevice, size: usize) -> Result<ARef<gem::Object<Self>>> {
30        let aligned_size = size.next_multiple_of(1 << 12);
31
32        if size == 0 || size > aligned_size {
33            return Err(EINVAL);
34        }
35
36        gem::Object::new(dev, aligned_size)
37    }
38
39    /// Look up a GEM object handle for a `File` and return an `ObjectRef` for it.
40    #[inline]
41    pub(crate) fn lookup_handle(
42        file: &drm::File<File>,
43        handle: u32,
44    ) -> Result<ARef<gem::Object<Self>>> {
45        gem::Object::lookup_handle(file, handle)
46    }
47}