drm: Add functions to query device state

src/backend/drm/egl/mod.rs

@@ -1,4 +1,5 @@
-use drm::control::{crtc, Mode};
+use drm::control::{connector, crtc, Mode, ResourceHandles, ResourceInfo};
+use nix::libc::dev_t;
 use std::cell::RefCell;
 use std::iter::FromIterator;
 use std::os::unix::io::{AsRawFd, RawFd};
@@ -123,6 +124,10 @@ where
 {
     type Surface = EglSurface<B, D>;
 
+    fn device_id(&self) -> dev_t {
+        self.dev.borrow().device_id()
+    }
+
     fn set_handler(&mut self, handler: impl DeviceHandler<Device = Self> + 'static) {
         self.dev.borrow_mut().set_handler(InternalDeviceHandler {
             handler: Box::new(handler),
@@ -155,6 +160,20 @@ where
     fn process_events(&mut self) {
         self.dev.borrow_mut().process_events()
     }
+
+    fn resource_info<T: ResourceInfo>(&self, handle: T::Handle) -> Result<T> {
+        self.dev
+            .borrow()
+            .resource_info(handle)
+            .chain_err(|| ErrorKind::UnderlyingBackendError)
+    }
+
+    fn resource_handles(&self) -> Result<ResourceHandles> {
+        self.dev
+            .borrow()
+            .resource_handles()
+            .chain_err(|| ErrorKind::UnderlyingBackendError)
+    }
 }
 
 impl<B: Backend<Surface = <D as Device>::Surface> + 'static, D: Device + NativeDisplay<B> + 'static>

src/backend/drm/gbm/mod.rs

@@ -1,7 +1,8 @@
-use super::{Device, DeviceHandler, RawDevice, Surface};
+use super::{Device, DeviceHandler, RawDevice, ResourceHandles, ResourceInfo, Surface};
 
 use drm::control::{connector, crtc, framebuffer, Device as ControlDevice, Mode};
 use gbm::{self, BufferObjectFlags, Format as GbmFormat};
+use nix::libc::dev_t;
 
 use std::cell::{Cell, RefCell};
 use std::collections::HashMap;
@@ -101,6 +102,10 @@ impl<D: RawDevice + ControlDevice + 'static> DeviceHandler for InternalDeviceHan
 impl<D: RawDevice + ControlDevice + 'static> Device for GbmDevice<D> {
     type Surface = GbmSurface<D>;
 
+    fn device_id(&self) -> dev_t {
+        self.dev.borrow().device_id()
+    }
+
     fn set_handler(&mut self, handler: impl DeviceHandler<Device = Self> + 'static) {
         self.dev.borrow_mut().set_handler(InternalDeviceHandler {
             handler: Box::new(handler),
@@ -175,6 +180,20 @@ impl<D: RawDevice + ControlDevice + 'static> Device for GbmDevice<D> {
     fn process_events(&mut self) {
         self.dev.borrow_mut().process_events()
     }
+
+    fn resource_info<T: ResourceInfo>(&self, handle: T::Handle) -> Result<T> {
+        self.dev
+            .borrow()
+            .resource_info(handle)
+            .chain_err(|| ErrorKind::UnderlyingBackendError)
+    }
+
+    fn resource_handles(&self) -> Result<ResourceHandles> {
+        self.dev
+            .borrow()
+            .resource_handles()
+            .chain_err(|| ErrorKind::UnderlyingBackendError)
+    }
 }
 
 impl<D: RawDevice + ControlDevice + 'static> AsRawFd for GbmDevice<D> {

src/backend/drm/legacy/mod.rs

@@ -1,6 +1,6 @@
 use super::{DevPath, Device, DeviceHandler, RawDevice, Surface};
 
-use drm::control::{connector, crtc, encoder, Device as ControlDevice, Mode, ResourceInfo};
+use drm::control::{connector, crtc, encoder, Device as ControlDevice, Mode, ResourceHandles, ResourceInfo};
 use drm::Device as BasicDevice;
 use nix::libc::dev_t;
 use nix::sys::stat::fstat;
@@ -78,7 +78,7 @@ impl<A: AsRawFd + 'static> LegacyDrmDevice<A> {
             drm.priviledged = false;
         };
 
-        let res_handles = drm.resource_handles().chain_err(|| {
+        let res_handles = ControlDevice::resource_handles(&drm).chain_err(|| {
             ErrorKind::DrmDev(format!("Error loading drm resources on {:?}", drm.dev_path()))
         })?;
         for &con in res_handles.connectors() {
@@ -104,10 +104,6 @@ impl<A: AsRawFd + 'static> LegacyDrmDevice<A> {
 
         Ok(drm)
     }
-
-    pub fn dev_id(&self) -> dev_t {
-        self.dev_id
-    }
 }
 
 impl<A: AsRawFd + 'static> AsRawFd for LegacyDrmDevice<A> {
@@ -122,6 +118,10 @@ impl<A: AsRawFd + 'static> ControlDevice for LegacyDrmDevice<A> {}
 impl<A: AsRawFd + 'static> Device for LegacyDrmDevice<A> {
     type Surface = LegacyDrmSurface<A>;
 
+    fn device_id(&self) -> dev_t {
+        self.dev_id
+    }
+
     fn set_handler(&mut self, handler: impl DeviceHandler<Device = Self> + 'static) {
         self.handler = Some(RefCell::new(Box::new(handler)));
     }
@@ -167,7 +167,7 @@ impl<A: AsRawFd + 'static> Device for LegacyDrmDevice<A> {
                 }).collect::<Result<Vec<encoder::Info>>>()?;
 
             // and if any encoder supports the selected crtc
-            let resource_handles = self.resource_handles().chain_err(|| {
+            let resource_handles = ControlDevice::resource_handles(self).chain_err(|| {
                 ErrorKind::DrmDev(format!("Error loading drm resources on {:?}", self.dev_path()))
             })?;
             if !encoders
@@ -229,6 +229,16 @@ impl<A: AsRawFd + 'static> Device for LegacyDrmDevice<A> {
             },
         }
     }
+
+    fn resource_info<T: ResourceInfo>(&self, handle: T::Handle) -> Result<T> {
+        T::load_from_device(self, handle)
+            .chain_err(|| ErrorKind::DrmDev(format!("Error loading resource info on {:?}", self.dev_path())))
+    }
+
+    fn resource_handles(&self) -> Result<ResourceHandles> {
+        ControlDevice::resource_handles(self)
+            .chain_err(|| ErrorKind::DrmDev(format!("Error loading resource info on {:?}", self.dev_path())))
+    }
 }
 
 impl<A: AsRawFd + 'static> RawDevice for LegacyDrmDevice<A> {

src/backend/drm/mod.rs

@@ -1,11 +1,9 @@
-pub use drm::control::connector;
-pub use drm::control::crtc;
-pub use drm::control::framebuffer;
-use drm::control::Device as ControlDevice;
-pub use drm::control::Mode;
-use drm::Device as BasicDevice;
+pub use drm::{
+    control::{connector, crtc, framebuffer, Device as ControlDevice, Mode, ResourceHandles, ResourceInfo},
+    Device as BasicDevice,
+};
+pub use nix::libc::dev_t;
 
-use std::borrow::Borrow;
 use std::error::Error;
 use std::iter::IntoIterator;
 use std::os::unix::io::AsRawFd;
@@ -34,6 +32,7 @@ pub trait DeviceHandler {
 pub trait Device: AsRawFd + DevPath {
     type Surface: Surface;
 
+    fn device_id(&self) -> dev_t;
     fn set_handler(&mut self, handler: impl DeviceHandler<Device = Self> + 'static);
     fn clear_handler(&mut self);
     fn create_surface(
@@ -43,6 +42,11 @@ pub trait Device: AsRawFd + DevPath {
         connectors: impl IntoIterator<Item = connector::Handle>,
     ) -> Result<Self::Surface, <Self::Surface as Surface>::Error>;
     fn process_events(&mut self);
+    fn resource_info<T: ResourceInfo>(
+        &self,
+        handle: T::Handle,
+    ) -> Result<T, <Self::Surface as Surface>::Error>;
+    fn resource_handles(&self) -> Result<ResourceHandles, <Self::Surface as Surface>::Error>;
 }
 
 pub trait RawDevice: Device<Surface = <Self as RawDevice>::Surface> {