fix: stop redox-drm on terminal scheme EBADF

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/gpu/redox-drm/P8-terminal-scheme-ebadf.patch

@@ -0,0 +1,49 @@
+--- a/src/main.rs
++++ b/src/main.rs
+@@ -24,6 +24,7 @@ use redox_driver_sys::pcid_client::PcidClient;
+ use redox_driver_sys::quirks::PciQuirkFlags;
+ use redox_scheme::{SignalBehavior, Socket};
++use syscall04::error::EBADF;
+ 
+ use crate::driver::{DriverError, DriverEvent, GpuDriver, Result};
+ use crate::drivers::DriverRegistry;
+@@ -102,10 +103,13 @@ fn run() -> Result<()> {
+     let event_scheme = drm_scheme.clone();
+ 
+     std::thread::spawn(move || loop {
+-        if let Ok(event) = event_rx.recv() {
+-            if let Ok(mut scheme) = event_scheme.lock() {
+-                scheme.handle_driver_event(event);
+-            }
++        let Ok(event) = event_rx.recv() else {
++            info!("redox-drm: event producer dropped, stopping driver event thread");
++            break;
++        };
++
++        if let Ok(mut scheme) = event_scheme.lock() {
++            scheme.handle_driver_event(event);
+         }
+     });
+ 
+@@ -118,6 +122,10 @@ fn run() -> Result<()> {
+                 break;
+             }
+             Err(e) => {
++                if e.errno == EBADF {
++                    info!("redox-drm: scheme fd closed, exiting");
++                    break;
++                }
+                 error!("redox-drm: failed to receive scheme request: {}", e);
+                 continue;
+             }
+@@ -145,6 +153,10 @@ fn run() -> Result<()> {
+         };
+ 
+         if let Err(e) = socket.write_response(response, SignalBehavior::Restart) {
++            if e.errno == EBADF {
++                info!("redox-drm: scheme fd closed while writing response, exiting");
++                break;
++            }
+             error!("redox-drm: failed to write scheme response: {}", e);
+         }
+     }

local/recipes/gpu/redox-drm/source/src/main.rs

@@ -20,8 +20,10 @@ use redox_driver_sys::pci::{
     enumerate_pci_class, PciDevice, PciDeviceInfo, PciLocation, PCI_CLASS_DISPLAY,
     PCI_VENDOR_ID_AMD, PCI_VENDOR_ID_INTEL,
 };
+use redox_driver_sys::pcid_client::PcidClient;
 use redox_driver_sys::quirks::PciQuirkFlags;
 use redox_scheme::{SignalBehavior, Socket};
+use syscall04::error::EBADF;
 
 use crate::driver::{DriverError, DriverEvent, GpuDriver, Result};
 use crate::drivers::DriverRegistry;
@@ -111,6 +113,10 @@ fn run() -> Result<()> {
                 break;
             }
             Err(e) => {
+                if e.errno == EBADF {
+                    info!("redox-drm: scheme fd closed, exiting");
+                    break;
+                }
                 error!("redox-drm: failed to receive scheme request: {}", e);
                 continue;
             }
@@ -139,6 +145,10 @@ fn run() -> Result<()> {
         };
 
         if let Err(e) = socket.write_response(response, SignalBehavior::Restart) {
+            if e.errno == EBADF {
+                info!("redox-drm: scheme fd closed while writing response, exiting");
+                break;
+            }
             error!("redox-drm: failed to write scheme response: {}", e);
         }
     }
@@ -164,6 +174,18 @@ fn select_gpu_from_args() -> Result<PciDeviceInfo> {
         });
     }
 
+    if let Some(mut pcid) = PcidClient::connect_default() {
+        let function = pcid.request_config().map_err(|e| {
+            DriverError::Pci(format!("failed to read pcid-spawner handoff config: {e}"))
+        })?;
+        let info = function.device_info();
+        info!(
+            "redox-drm: selected GPU from pcid-spawner handoff at {}",
+            info.location
+        );
+        return Ok(info);
+    }
+
     let devices = enumerate_pci_class(PCI_CLASS_DISPLAY)
         .map_err(|e| DriverError::Pci(format!("PCI scan failed: {e}")))?;
     let first = devices
@@ -241,8 +263,6 @@ const INTEL_CNL_DMC_KEYS: &[&str] = &["i915/cnl_dmc_ver1_07.bin", "i915/cnl_dmc_
 const INTEL_ICL_DMC_KEYS: &[&str] = &["i915/icl_dmc_ver1_09.bin", "i915/icl_dmc_ver1_07.bin"];
 const INTEL_GLK_DMC_KEYS: &[&str] = &["i915/glk_dmc_ver1_04.bin"];
 const INTEL_RKL_DMC_KEYS: &[&str] = &["i915/rkl_dmc_ver2_03.bin", "i915/rkl_dmc_ver2_02.bin"];
-const INTEL_DG1_DMC_KEYS: &[&str] = &["i915/dg1_dmc_ver2_02.bin"];
-
 fn intel_display_firmware_keys(device_id: u16) -> Option<&'static [&'static str]> {
     match device_id {
         // Gen12+ (Tiger Lake and newer)
@@ -271,8 +291,6 @@ fn intel_display_firmware_keys(device_id: u16) -> Option<&'static [&'static str]
         | 0x9BAA | 0x9BAC | 0x9BC2 | 0x9BC4 | 0x9BC5 | 0x9BC6 | 0x9BC8 | 0x9BCA
         | 0x9BCC | 0x9BE6 | 0x9BF6 => Some(INTEL_KBL_DMC_KEYS),
         0x0A84 | 0x1A84 | 0x1A85 | 0x5A84 | 0x5A85 => Some(INTEL_GLK_DMC_KEYS),
-        // DG1 (Gen12)
-        0x4905 | 0x4906 | 0x4907 | 0x4908 | 0x4909 => Some(INTEL_DG1_DMC_KEYS),
         _ => None,
     }
 }