1 files changed, 38 insertions, 2 deletions
diff --git a/notcuda/src/impl/function.rs b/notcuda/src/impl/function.rs
index 394f806..27bf9b6 100644
--- a/notcuda/src/impl/function.rs
+++ b/notcuda/src/impl/function.rs
@@ -1,7 +1,9 @@
 use ::std::os::raw::{c_uint, c_void};
-use std::ptr;
+use std::{hint, ptr};
 
-use super::{CUresult, GlobalState, HasLivenessCookie, LiveCheck, stream::Stream};
+use crate::cuda::CUfunction_attribute;
+
+use super::{stream::Stream, CUresult, GlobalState, HasLivenessCookie, LiveCheck};
 
 pub type Function = LiveCheck<FunctionData>;
 
@@ -23,6 +25,19 @@ pub struct FunctionData {
     pub base: l0::Kernel<'static>,
     pub arg_size: Vec<usize>,
     pub use_shared_mem: bool,
+    pub properties: Option<Box<l0::sys::ze_kernel_properties_t>>,
+}
+
+impl FunctionData {
+    fn get_properties(&mut self) -> Result<&l0::sys::ze_kernel_properties_t, l0::sys::ze_result_t> {
+        if let None = self.properties {
+            self.properties = Some(self.base.get_properties()?)
+        }
+        match self.properties {
+            Some(ref props) => Ok(props.as_ref()),
+            None => unsafe { hint::unreachable_unchecked() },
+        }
+    }
 }
 
 pub fn launch_kernel(
@@ -74,3 +89,24 @@ pub fn launch_kernel(
         Ok(())
     })?
 }
+
+pub(crate) fn get_attribute(
+    pi: *mut i32,
+    attrib: CUfunction_attribute,
+    func: *mut Function,
+) -> Result<(), CUresult> {
+    if pi == ptr::null_mut() || func == ptr::null_mut() {
+        return Err(CUresult::CUDA_ERROR_INVALID_VALUE);
+    }
+    match attrib {
+        CUfunction_attribute::CU_FUNC_ATTRIBUTE_MAX_THREADS_PER_BLOCK => {
+            let max_threads = GlobalState::lock_function(func, |func| {
+                let props = func.get_properties()?;
+                Ok::<_, CUresult>(props.maxSubgroupSize * props.maxNumSubgroups)
+            })??;
+            unsafe { *pi = max_threads as i32 };
+            Ok(())
+        }
+        _ => Err(CUresult::CUDA_ERROR_NOT_SUPPORTED),
+    }
+}