black_hole: provide Gpu service

Ref #4419

repos/os/recipes/pkg/black_hole/runtime

@@ -8,6 +8,7 @@
 		<nic/>
 		<uplink/>
 		<rom/>
+		<gpu/>
 	</provides>
 
 	<config>
@@ -18,6 +19,7 @@
 		<nic/>
 		<uplink/>
 		<rom/>
+		<gpu/>
 	</config>
 
 	<content>

repos/os/recipes/pkg/test-black_hole/hash

@@ -1 +1 @@
-2022-02-27 fe6aa1093a593ebb302573fcb11dab869c1acb0f
+2022-03-14-a 6724cbbd02509f6ad5090732cbd0603996a364f6

repos/os/recipes/pkg/test-black_hole/runtime

@@ -30,6 +30,7 @@
 		<start name="black_hole" caps="100">
 			<resource name="RAM" quantum="1M"/>
 			<provides>
+				<service name="Gpu"/>
 				<service name="ROM"/>
 				<service name="Uplink"/>
 				<service name="Nic"/>
@@ -39,6 +40,7 @@
 				<service name="Audio_out"/>
 			</provides>
 			<config>
+				<gpu/>
 				<rom/>
 				<uplink/>
 				<nic/>
@@ -56,9 +58,10 @@
 			</route>
 		</start>
 
-		<start name="test-black_hole" caps="100">
+		<start name="test-black_hole" caps="200">
 			<resource name="RAM" quantum="10M"/>
 			<route>
+				<service name="Gpu">                   <child name="black_hole"/> </service>
 				<service name="ROM" label="any_label"> <child name="black_hole"/> </service>
 				<service name="Uplink">                <child name="black_hole"/> </service>
 				<service name="Nic">                   <child name="black_hole"/> </service>

repos/os/recipes/src/black_hole/hash

@@ -1 +1 @@
-2022-02-27 cc6e9715322ae66af7bb35c04f219ababd98c093
+2022-03-14-a 3803170cb66f1d232ca2b73416503d11d691568b

repos/os/recipes/src/black_hole/used_apis

@@ -5,4 +5,5 @@ capture_session
 event_session
 nic_session
 uplink_session
+gpu_session
 os

repos/os/recipes/src/test-black_hole/used_apis

@@ -7,3 +7,4 @@ event_session
 capture_session
 nic_session
 uplink_session
+gpu_session

repos/os/src/server/black_hole/README

@@ -11,6 +11,7 @@ in the configuration of the component:
 * Nic
 * Uplink
 * ROM
+* Gpu
 
 <config>
 	<audio_in/>
@@ -20,4 +21,5 @@ in the configuration of the component:
 	<nic/>
 	<uplink/>
 	<rom/>
+	<gpu/>
 </config>

repos/os/src/server/black_hole/config.xsd

@@ -4,6 +4,7 @@
 	<xs:element name="config">
 		<xs:complexType>
 			<xs:choice minOccurs="0" maxOccurs="unbounded">
+				<xs:element name="gpu"/>
 				<xs:element name="rom"/>
 				<xs:element name="uplink"/>
 				<xs:element name="nic"/>

repos/os/src/server/black_hole/gpu.h

@@ -0,0 +1,171 @@
+/*
+ * \brief  Gpu session component and root
+ * \author Martin Stein
+ * \date   2022-02-12
+ */
+
+/*
+ * Copyright (C) 2022 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU Affero General Public License version 3.
+ */
+
+#ifndef _GPU_H_
+#define _GPU_H_
+
+/* Genode includes */
+#include <base/attached_ram_dataspace.h>
+#include <base/rpc_server.h>
+#include <base/session_object.h>
+#include <dataspace/client.h>
+#include <gpu_session/gpu_session.h>
+#include <root/component.h>
+
+namespace Black_hole {
+
+	using namespace Genode;
+	using namespace Gpu;
+
+	class Gpu_session;
+	class Gpu_root;
+
+	using Gpu_root_component = Root_component<Gpu_session, Multiple_clients>;
+}
+
+
+class Black_hole::Gpu_session : public Session_object<Gpu::Session>
+{
+	private:
+
+		Env                    &_env;
+		Attached_ram_dataspace  _info_dataspace { _env.ram(), _env.rm(), 1 };
+
+	public:
+
+		Gpu_session(Env         &env,
+		            Resources    resources,
+		            Label const &label,
+		            Diag         diag)
+		:
+			Session_object { env.ep(), resources, label, diag },
+			_env           { env }
+		{ }
+
+
+		/***************************
+		 ** Gpu session interface **
+		 ***************************/
+
+		Dataspace_capability info_dataspace() const override
+		{
+			return _info_dataspace.cap();
+		}
+
+		Sequence_number exec_buffer(Buffer_id /* id */,
+		                            size_t    /* size */) override
+		{
+			throw Gpu::Session::Invalid_state();
+		}
+
+		bool complete(Sequence_number /* seqno */) override
+		{
+			return false;
+		}
+
+		void completion_sigh(Signal_context_capability /* sigh */) override
+		{ }
+
+		Dataspace_capability alloc_buffer(Buffer_id /* id */,
+		                                  size_t    /* size */) override
+		{
+			return Dataspace_capability { };
+		}
+
+		void free_buffer(Buffer_id /* id */) override { }
+
+		Buffer_capability export_buffer(Buffer_id /* id */) override
+		{
+			return Buffer_capability { };
+		}
+
+		void import_buffer(Buffer_capability /* cap */,
+		                   Buffer_id         /* id */) override
+		{ }
+
+		Dataspace_capability
+		map_buffer(Buffer_id          /* id */,
+		           bool               /* aperture */,
+		           Mapping_attributes /* attrs */) override
+		{
+			return Dataspace_capability { };
+		}
+
+		void unmap_buffer(Buffer_id /* id */) override { }
+
+		bool map_buffer_ppgtt(Buffer_id   /* id */,
+		                      Gpu::addr_t /* va */) override
+		{
+			return false;
+		}
+
+		void unmap_buffer_ppgtt(Buffer_id   /* id */,
+		                        Gpu::addr_t /* va */) override
+		{ }
+
+		bool set_tiling(Buffer_id      /* id */,
+		                uint32_t const /* mode */) override
+		{
+			return false;
+		}
+};
+
+
+class Black_hole::Gpu_root : public Gpu_root_component
+{
+	private:
+
+		Env &_env;
+
+		size_t _ram_quota(char const *args)
+		{
+			return Arg_string::find_arg(args, "ram_quota").ulong_value(0);
+		}
+
+	protected:
+
+		Gpu_session *_create_session(char const *args) override
+		{
+			/* at the moment we just need about ~160KiB for initial RCS bring-up */
+			size_t const required_quota { Gpu::Session::REQUIRED_QUOTA / 2 };
+			size_t const ram_quota      { _ram_quota(args) };
+
+			if (ram_quota < required_quota) {
+
+				Session_label const label { label_from_args(args) };
+				warning("insufficient dontated ram_quota (", ram_quota,
+				        " bytes), require ", required_quota, " bytes ",
+				        " by '", label, "'");
+
+				throw Gpu::Session::Out_of_ram();
+			}
+			Genode::Session::Resources const resources {
+				session_resources_from_args(args) };
+
+			return new (md_alloc())
+				Gpu_session {
+					_env, resources, session_label_from_args(args),
+					session_diag_from_args(args) };
+		}
+
+	public:
+
+		Gpu_root(Env       &env,
+		         Allocator &alloc)
+		:
+			Root_component { env.ep(), alloc },
+			_env           { env }
+		{ }
+};
+
+#endif /* _GPU_H_ */

repos/os/src/server/black_hole/main.cc

@@ -28,6 +28,7 @@
 #include "nic.h"
 #include "uplink.h"
 #include "rom.h"
+#include "gpu.h"
 
 
 /***************
@@ -49,6 +50,7 @@ struct Black_hole::Main
 	Genode::Constructible<Nic_root>        nic_root       { };
 	Genode::Constructible<Uplink_root>     uplink_root    { };
 	Genode::Constructible<Rom_root>        rom_root       { };
+	Genode::Constructible<Gpu_root>        gpu_root       { };
 
 	Main(Genode::Env &env) : env(env)
 	{
@@ -82,6 +84,10 @@ struct Black_hole::Main
 			rom_root.construct(env, heap);
 			env.parent().announce(env.ep().manage(*rom_root));
 		}
+		if (_config_rom.xml().has_sub_node("gpu")) {
+			gpu_root.construct(env, heap);
+			env.parent().announce(env.ep().manage(*gpu_root));
+		}
 	}
 };
 

repos/os/src/test/black_hole/main.cc

@@ -23,6 +23,7 @@
 #include <base/attached_rom_dataspace.h>
 
 /* os includes */
+#include <gpu_session/connection.h>
 #include <event_session/connection.h>
 #include <capture_session/connection.h>
 #include <audio_in_session/connection.h>
@@ -336,6 +337,7 @@ class Black_hole_test::Main
 		Signal_handler<Main>   _signal_handler { _env.ep(), *this, &Main::_handle_signal };
 		Audio_in::Connection   _audio_in       { _env, "left" };
 		Audio_out::Connection  _audio_out      { _env, "left" };
+		Gpu::Connection        _gpu            { _env };
 		Nic_test               _nic_test       { _env, _heap, _signal_handler };
 		Uplink_test            _uplink_test    { _env, _heap, _signal_handler };
 		Capture_test           _capture_test   { _env };