drm: include st_rdev in Drm object

src/backends/metal/monitor.rs

@@ -236,7 +236,13 @@ impl MetalBackend {
                     return;
                 }
             };
-            let master = Rc::new(DrmMaster::new(&slf.state.ring, res.fd.clone()));
+            let master = match DrmMaster::new(&slf.state.ring, res.fd.clone()) {
+                Ok(m) => Rc::new(m),
+                Err(e) => {
+                    log::error!("Could not open the drm device: {}", ErrorFmt(e));
+                    return;
+                }
+            };
             let dev = match slf.create_drm_device(dev, &master) {
                 Ok(d) => d,
                 Err(e) => {

src/backends/x.rs

@@ -59,7 +59,7 @@ use {
         rc::Rc,
     },
     thiserror::Error,
-    uapi::{c::dev_t, Errno},
+    uapi::c::dev_t,
 };
 
 #[derive(Debug, Error)]
@@ -114,8 +114,6 @@ pub enum XBackendError {
     MapWindow(#[source] XconError),
     #[error("Could not query device")]
     QueryDevice(#[source] XconError),
-    #[error("Could not fstat the drm device")]
-    DrmDeviceFstat(#[source] Errno),
     #[error("Render device does not support XRGB8888 format")]
     XRGB8888,
 }
@@ -174,10 +172,7 @@ pub async fn create(state: &Rc<State>) -> Result<Rc<XBackend>, XBackendError> {
             Err(e) => return Err(XBackendError::DriOpen(e)),
         }
     };
-    let drm_dev = match uapi::fstat(drm.raw()) {
-        Ok(s) => s.st_rdev,
-        Err(e) => return Err(XBackendError::DrmDeviceFstat(e)),
-    };
+    let drm_dev = drm.dev();
     let gbm = GbmDevice::new(&drm)?;
     let ctx = match state.create_gfx_context(&drm, None) {
         Ok(r) => r,

src/drm_feedback.rs

@@ -36,11 +36,10 @@ impl DrmFeedback {
         ids: &DrmFeedbackIds,
         render_ctx: &dyn GfxContext,
     ) -> Result<Self, DrmFeedbackError> {
-        let drm = match render_ctx.allocator().drm() {
-            Some(drm) => drm.raw(),
+        let main_device = match render_ctx.allocator().drm() {
+            Some(drm) => drm.dev(),
             _ => return Err(DrmFeedbackError::NoDrmDevice),
         };
-        let main_device = uapi::fstat(drm).map_err(OsError::from)?.st_rdev;
         let (data, index_map) = create_fd_data(render_ctx);
         let mut memfd =
             uapi::memfd_create("drm_feedback", c::MFD_CLOEXEC | c::MFD_ALLOW_SEALING).unwrap();

src/gfx_apis/vulkan.rs

@@ -91,8 +91,6 @@ pub enum VulkanError {
     CreateInstance(#[source] vk::Result),
     #[error("Could not create a debug-utils messenger")]
     Messenger(#[source] vk::Result),
-    #[error("Could not fstat the DRM FD")]
-    Fstat(#[source] OsError),
     #[error("Could not enumerate the physical devices")]
     EnumeratePhysicalDevices(#[source] vk::Result),
     #[error("Could not find a vulkan device that matches dev_t {0}")]

src/gfx_apis/vulkan/device.rs

@@ -104,11 +104,7 @@ impl VulkanInstance {
     }
 
     fn find_dev(&self, drm: &Drm) -> Result<PhysicalDevice, VulkanError> {
-        let stat = match uapi::fstat(drm.raw()) {
-            Ok(s) => s,
-            Err(e) => return Err(VulkanError::Fstat(e.into())),
-        };
-        let dev = stat.st_rdev;
+        let dev = drm.dev();
         log::log!(
             self.log_level,
             "Searching for vulkan device with devnum {}:{}",

src/ifs/wp_drm_lease_device_v1.rs

@@ -210,6 +210,8 @@ efrom!(WpDrmLeaseDeviceV1Error, ClientError);
 enum ReopenError {
     #[error("Could not open the dev node")]
     OpenNode(#[source] OsError),
+    #[error("Could not create the DRM device")]
+    CreateDrm(#[source] DrmError),
     #[error("Could not drop DRM master")]
     DropMaster(#[source] DrmError),
 }
@@ -218,7 +220,7 @@ fn reopen_card(devnode: &str) -> Result<Rc<OwnedFd>, ReopenError> {
     let fd = uapi::open(devnode, c::O_RDWR | c::O_CLOEXEC, 0)
         .map_err(|e| ReopenError::OpenNode(e.into()))?;
     let fd = Rc::new(fd);
-    let drm = Drm::open_existing(fd.clone());
+    let drm = Drm::open_existing(fd.clone()).map_err(ReopenError::CreateDrm)?;
     if drm.is_master() {
         drm.drop_master().map_err(ReopenError::DropMaster)?;
     }

src/it/test_backend.rs

@@ -24,7 +24,7 @@ use {
             on_change::OnChange, oserror::OsError, syncqueue::SyncQueue,
         },
         video::{
-            drm::{ConnectorType, Drm},
+            drm::{ConnectorType, Drm, DrmError},
             gbm::{GbmDevice, GbmError},
         },
     },
@@ -42,6 +42,8 @@ pub enum TestBackendError {
     NoDrmNode,
     #[error("Could not open drm node {0}")]
     OpenDrmNode(String, #[source] OsError),
+    #[error("Could not open the drm device")]
+    OpenDrmDevice(#[source] DrmError),
     #[error("Could not create a render context")]
     RenderContext(#[source] GfxError),
     #[error("Could not create a gbm device")]
@@ -264,7 +266,7 @@ where
             ))
         }
     };
-    let drm = Drm::open_existing(file);
+    let drm = Drm::open_existing(file).map_err(TestBackendError::OpenDrmDevice)?;
     f(drm)
 }
 

src/portal/ptl_display.rs

@@ -162,13 +162,14 @@ impl UsrJayRenderCtxOwner for PortalDisplay {
 
     fn device(&self, fd: Rc<OwnedFd>, server_formats: Option<AHashMap<u32, GfxFormat>>) {
         self.render_ctx.take();
-        let dev_id = match uapi::fstat(fd.raw()) {
-            Ok(s) => s.st_rdev,
+        let drm = match Drm::open_existing(fd) {
+            Ok(d) => d,
             Err(e) => {
-                log::error!("Could not fstat display device: {}", ErrorFmt(e));
+                log::error!("Could not open the drm device: {}", ErrorFmt(e));
                 return;
             }
         };
+        let dev_id = drm.dev();
         let mut render_ctx = None;
         if let Some(ctx) = self.state.render_ctxs.get(&dev_id) {
             if let Some(ctx) = ctx.upgrade() {
@@ -176,7 +177,6 @@ impl UsrJayRenderCtxOwner for PortalDisplay {
             }
         }
         if render_ctx.is_none() {
-            let drm = Drm::open_existing(fd);
             let ctx =
                 match create_gfx_context(&self.state.eng, &self.state.ring, &drm, GfxApi::OpenGl) {
                     Ok(c) => c,

src/video/drm.rs

@@ -144,6 +144,8 @@ pub enum DrmError {
     DropMaster(#[source] OsError),
     #[error("Could not queue a CRTC sequence")]
     QueueSequence(#[source] OsError),
+    #[error("Could not stat the DRM fd")]
+    Stat(#[source] OsError),
 }
 
 fn render_node_name(fd: c::c_int) -> Result<Ustring, DrmError> {
@@ -177,17 +179,24 @@ fn reopen(fd: c::c_int, need_primary: bool) -> Result<Rc<OwnedFd>, DrmError> {
 
 pub struct Drm {
     fd: Rc<OwnedFd>,
+    dev: c::dev_t,
 }
 
 impl Drm {
-    pub fn open_existing(fd: Rc<OwnedFd>) -> Self {
-        Self { fd }
+    pub fn open_existing(fd: Rc<OwnedFd>) -> Result<Self, DrmError> {
+        let stat = uapi::fstat(fd.raw()).map_err(|e| DrmError::Stat(e.into()))?;
+        Ok(Self {
+            fd,
+            dev: stat.st_rdev,
+        })
     }
 
     pub fn reopen(fd: c::c_int, need_primary: bool) -> Result<Self, DrmError> {
-        Ok(Self {
-            fd: reopen(fd, need_primary)?,
-        })
+        Self::open_existing(reopen(fd, need_primary)?)
+    }
+
+    pub fn dev(&self) -> c::dev_t {
+        self.dev
     }
 
     pub fn fd(&self) -> &Rc<OwnedFd> {
@@ -291,16 +300,16 @@ impl DrmLease {
 }
 
 impl DrmMaster {
-    pub fn new(ring: &Rc<IoUring>, fd: Rc<OwnedFd>) -> Self {
-        Self {
-            drm: Drm { fd },
+    pub fn new(ring: &Rc<IoUring>, fd: Rc<OwnedFd>) -> Result<Self, DrmError> {
+        Ok(Self {
+            drm: Drm::open_existing(fd)?,
             u32_bufs: Default::default(),
             u64_bufs: Default::default(),
             gem_handles: Default::default(),
             events: Default::default(),
             ring: ring.clone(),
             buf: RefCell::new(Buf::new(1024)),
-        }
+        })
     }
 
     pub fn raw(&self) -> c::c_int {