From 19210277a25d681552b45e6a8900b9a42efdf620 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 5 May 2022 16:24:01 -0700
Subject: [PATCH] ircd::cl::data: Add master() method for associated memobject.

---
 include/ircd/cl/data.h |  1 +
 ircd/cl.cc             | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/ircd/cl/data.h b/include/ircd/cl/data.h
index 63ad9e59e..614201fe5 100644
--- a/include/ircd/cl/data.h
+++ b/include/ircd/cl/data.h
@@ -22,6 +22,7 @@ struct ircd::cl::data
   public:
 	explicit operator bool() const;
 
+	void *master() const;
 	uint flags() const;
 	size_t size() const;
 	off_t offset() const;
diff --git a/ircd/cl.cc b/ircd/cl.cc
index 05643e3aa..5a1266352 100644
--- a/ircd/cl.cc
+++ b/ircd/cl.cc
@@ -2166,6 +2166,17 @@ const
 	return info<uint>(clGetMemObjectInfo, cl_mem(mutable_cast(handle)), CL_MEM_FLAGS, buf);
 }
 
+void *
+ircd::cl::data::master()
+const
+{
+	assert(handle);
+
+	char buf[sizeof(void *)] {0};
+	constexpr auto qtype(CL_MEM_ASSOCIATED_MEMOBJECT);
+	return info<cl_mem>(clGetMemObjectInfo, cl_mem(mutable_cast(handle)), qtype, buf);
+}
+
 //
 // cl::work (event)
 //