Handle zeInit returning like other GPU packages (#549)

Author: michel2323

Project.toml

@@ -1,7 +1,7 @@
 name = "oneAPI"
 uuid = "8f75cd03-7ff8-4ecb-9b8f-daf728133b1b"
-version = "2.5.0"
-authors = ["Tim Besard <tim.besard@gmail.com>"]
+version = "2.5.1"
+authors = ["Tim Besard <tim.besard@gmail.com>", "Alexis Montoison",  "Michel Schanen <michel.schanen@gmail.com>"]
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"

lib/level-zero/oneL0.jl

@@ -162,13 +162,35 @@ function __init__()
 
     try
         zeInit(0)
-        functional[] = true
     catch err
+        # Handle the specific case where no oneAPI device is available
+        if err isa ZeError && err.code == RESULT_ERROR_UNINITIALIZED
+            functional[] = false
+            return
+        end
+        # For other errors, still report them as errors
         @error "Failed to initialize oneAPI" exception=(err,catch_backtrace())
         functional[] = false
         return
     end
 
+    # Check if there are actually any drivers/devices available
+    try
+        drv_count = Ref{UInt32}(0)
+        zeDriverGet(drv_count, C_NULL)
+        if drv_count[] == 0
+            @info "oneAPI initialized but no drivers found. oneAPI.jl will not be functional."
+            functional[] = false
+            return
+        end
+    catch err
+        @error "Failed to enumerate oneAPI drivers" exception = (err, catch_backtrace())
+        functional[] = false
+        return
+    end
+
+    functional[] = true
+
     validation_layer[] = parse(Bool, get(ENV, "ZE_ENABLE_VALIDATION_LAYER", "false"))
     parameter_validation[] = parse(Bool, get(ENV, "ZE_ENABLE_PARAMETER_VALIDATION", "false"))
 end