1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// SPDX-License-Identifier: GPL-2.0 OR MIT
//! DRM device.
//!
//! C header: [`include/linux/drm/drm_device.h`](srctree/include/linux/drm/drm_device.h)
use crate::{
bindings, device, drm,
drm::drv::AllocImpl,
error::code::*,
error::from_err_ptr,
error::Result,
types::{ARef, AlwaysRefCounted, ForeignOwnable, Opaque},
};
use core::{ffi::c_void, marker::PhantomData, ptr::NonNull};
#[cfg(CONFIG_DRM_LEGACY)]
macro_rules! drm_legacy_fields {
( $($field:ident: $val:expr),* $(,)? ) => {
bindings::drm_driver {
$( $field: $val ),*,
firstopen: None,
preclose: None,
dma_ioctl: None,
dma_quiescent: None,
context_dtor: None,
irq_handler: None,
irq_preinstall: None,
irq_postinstall: None,
irq_uninstall: None,
get_vblank_counter: None,
enable_vblank: None,
disable_vblank: None,
dev_priv_size: 0,
}
}
}
#[cfg(not(CONFIG_DRM_LEGACY))]
macro_rules! drm_legacy_fields {
( $($field:ident: $val:expr),* $(,)? ) => {
bindings::drm_driver {
$( $field: $val ),*
}
}
}
/// A typed DRM device with a specific `drm::drv::Driver` implementation. The device is always
/// reference-counted.
///
/// # Invariants
///
/// `drm_dev_release()` can be called from any non-atomic context.
#[repr(transparent)]
pub struct Device<T: drm::drv::Driver>(Opaque<bindings::drm_device>, PhantomData<T>);
impl<T: drm::drv::Driver> Device<T> {
const VTABLE: bindings::drm_driver = drm_legacy_fields! {
load: None,
open: Some(drm::file::open_callback::<T::File>),
postclose: Some(drm::file::postclose_callback::<T::File>),
unload: None,
release: Some(Self::release),
master_set: None,
master_drop: None,
debugfs_init: None,
gem_create_object: T::Object::ALLOC_OPS.gem_create_object,
prime_handle_to_fd: T::Object::ALLOC_OPS.prime_handle_to_fd,
prime_fd_to_handle: T::Object::ALLOC_OPS.prime_fd_to_handle,
gem_prime_import: T::Object::ALLOC_OPS.gem_prime_import,
gem_prime_import_sg_table: T::Object::ALLOC_OPS.gem_prime_import_sg_table,
dumb_create: T::Object::ALLOC_OPS.dumb_create,
dumb_map_offset: T::Object::ALLOC_OPS.dumb_map_offset,
show_fdinfo: None,
major: T::INFO.major,
minor: T::INFO.minor,
patchlevel: T::INFO.patchlevel,
name: T::INFO.name.as_char_ptr() as *mut _,
desc: T::INFO.desc.as_char_ptr() as *mut _,
date: T::INFO.date.as_char_ptr() as *mut _,
driver_features: T::FEATURES,
ioctls: T::IOCTLS.as_ptr(),
num_ioctls: T::IOCTLS.len() as i32,
fops: core::ptr::null_mut() as _,
};
/// Create a new `drm::device::Device` for a `drm::drv::Driver`.
pub fn new(dev: &device::Device, data: T::Data) -> Result<ARef<Self>> {
// SAFETY: `dev` is valid by its type invarants; `VTABLE`, as a `const` is pinned to the
// read-only section of the compilation.
let raw_drm = unsafe { bindings::drm_dev_alloc(&Self::VTABLE, dev.as_raw()) };
let raw_drm = NonNull::new(from_err_ptr(raw_drm)? as *mut _).ok_or(ENOMEM)?;
let data_ptr = <T::Data as ForeignOwnable>::into_foreign(data);
// SAFETY: The reference count is one, and now we take ownership of that reference as a
// drm::device::Device.
let drm = unsafe { ARef::<Self>::from_raw(raw_drm) };
// SAFETY: Safe as we set `dev_private` once at device creation.
unsafe { drm.set_raw_data(data_ptr) };
Ok(drm)
}
pub(crate) fn as_raw(&self) -> *mut bindings::drm_device {
self.0.get()
}
/// Not intended to be called externally, except via declare_drm_ioctls!()
///
/// # Safety
///
/// Callers must ensure that `ptr` is valid, non-null, and has a non-zero reference count,
/// i.e. it must be ensured that the reference count of the C `struct drm_device` `ptr` points
/// to can't drop to zero, for the duration of this function call and the entire duration when
/// the returned reference exists.
#[doc(hidden)]
pub unsafe fn borrow<'a>(ptr: *const bindings::drm_device) -> &'a Self {
// SAFETY: Safe by the safety requirements of this function.
unsafe { &*ptr.cast() }
}
pub(crate) fn raw_data(&self) -> *const c_void {
// SAFETY: `self` is guaranteed to hold a valid `bindings::drm_device` pointer.
unsafe { *self.as_raw() }.dev_private
}
/// # Safety
///
/// Must be called only once after device creation.
unsafe fn set_raw_data(&self, ptr: *const c_void) {
// SAFETY: Safe as by the safety precondition.
unsafe { &mut *self.as_raw() }.dev_private = ptr as _;
}
/// Returns a borrowed reference to the user data associated with this Device.
pub fn data(&self) -> <T::Data as ForeignOwnable>::Borrowed<'_> {
// SAFETY: `dev_private` is always set at device creation.
unsafe { T::Data::borrow(self.raw_data()) }
}
#[allow(clippy::missing_safety_doc)]
unsafe extern "C" fn release(drm: *mut bindings::drm_device) {
// SAFETY: Guaranteed to be a valid pointer to a `struct drm_device`.
let drm = unsafe { Self::borrow(drm) };
// SAFETY: `Self::data` is always converted and set on device creation.
unsafe { <T::Data as ForeignOwnable>::from_foreign(drm.raw_data()) };
}
}
// SAFETY: DRM device objects are always reference counted and the get/put functions
// satisfy the requirements.
unsafe impl<T: drm::drv::Driver> AlwaysRefCounted for Device<T> {
fn inc_ref(&self) {
// SAFETY: The existence of a shared reference guarantees that the refcount is non-zero.
unsafe { bindings::drm_dev_get(self.as_raw()) };
}
unsafe fn dec_ref(obj: NonNull<Self>) {
// SAFETY: The safety requirements guarantee that the refcount is non-zero.
unsafe { bindings::drm_dev_put(obj.cast().as_ptr()) };
}
}
impl<T: drm::drv::Driver> AsRef<device::Device> for Device<T> {
fn as_ref(&self) -> &device::Device {
// SAFETY: `bindings::drm_device::dev` is valid as long as the DRM device itself is valid,
// which is guaranteed by the type invariant.
unsafe { device::Device::as_ref((*self.as_raw()).dev) }
}
}
// SAFETY: As by the type invariant `Device` can be sent to any thread.
unsafe impl<T: drm::drv::Driver> Send for Device<T> {}
// SAFETY: `Device` can be shared among threads because all immutable methods are protected by the
// synchronization in `struct drm_device`.
unsafe impl<T: drm::drv::Driver> Sync for Device<T> {}
|
