#![cfg(feature = "minigbm")]
use std::ffi::CString;
use std::fs::File;
use std::fs::OpenOptions;
use std::os::raw::c_char;
use std::os::raw::c_int;
use std::os::raw::c_uint;
#[cfg(target_pointer_width = "64")]
use std::os::raw::c_ulong;
use std::path::Path;
use std::ptr::null_mut;
use base::ioctl_iowr_nr;
use base::ioctl_with_mut_ref;
use crate::rutabaga_utils::RutabagaError;
use crate::rutabaga_utils::RutabagaResult;
#[cfg(not(target_pointer_width = "64"))]
#[allow(non_camel_case_types)]
type __kernel_size_t = c_uint;
#[cfg(target_pointer_width = "64")]
#[allow(non_camel_case_types)]
type __kernel_size_t = c_ulong;
const DRM_IOCTL_BASE: c_uint = 0x64;
#[repr(C)]
#[derive(Copy, Clone)]
struct drm_version {
version_major: c_int,
version_minor: c_int,
version_patchlevel: c_int,
name_len: __kernel_size_t,
name: *mut c_char,
date_len: __kernel_size_t,
date: *mut c_char,
desc_len: __kernel_size_t,
desc: *mut c_char,
}
ioctl_iowr_nr!(DRM_IOCTL_VERSION, DRM_IOCTL_BASE, 0x0, drm_version);
fn get_drm_device_name(fd: &File) -> Result<String, ()> {
let mut version = drm_version {
version_major: 0,
version_minor: 0,
version_patchlevel: 0,
name_len: 0,
name: null_mut(),
date_len: 0,
date: null_mut(),
desc_len: 0,
desc: null_mut(),
};
if unsafe { ioctl_with_mut_ref(fd, DRM_IOCTL_VERSION(), &mut version) } < 0 {
return Err(());
}
let mut name_bytes: Vec<u8> = vec![0; (version.name_len + 1) as usize];
let mut version = drm_version {
version_major: 0,
version_minor: 0,
version_patchlevel: 0,
name_len: name_bytes.len() as __kernel_size_t,
name: name_bytes.as_mut_ptr() as *mut c_char,
date_len: 0,
date: null_mut(),
desc_len: 0,
desc: null_mut(),
};
if unsafe { ioctl_with_mut_ref(fd, DRM_IOCTL_VERSION(), &mut version) } < 0 {
return Err(());
}
CString::new(&name_bytes[..(version.name_len as usize)])
.map_err(|_| ())?
.into_string()
.map_err(|_| ())
}
pub fn open_device(undesired: &[&str]) -> RutabagaResult<File> {
const DRM_DIR_NAME: &str = "/dev/dri";
const DRM_MAX_MINOR: u32 = 15;
const RENDER_NODE_START: u32 = 128;
for n in RENDER_NODE_START..=RENDER_NODE_START + DRM_MAX_MINOR {
let path = Path::new(DRM_DIR_NAME).join(format!("renderD{}", n));
if let Ok(fd) = OpenOptions::new().read(true).write(true).open(path) {
if let Ok(name) = get_drm_device_name(&fd) {
if !undesired.iter().any(|item| *item == name) {
return Ok(fd);
}
}
}
}
Err(RutabagaError::SpecViolation("no DRM rendernode opened"))
}