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If the platform driver lacks the 'managing_system="yes"' attribute, requests for DMA addresses return 0. This patch is meant to help diagnosing such configuration issues. Issue #2243
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/*
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* \brief Client-side Platform-session interface
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* \author Stefan Kalkowski
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* \date 2020-04-28
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*/
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/*
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* Copyright (C) 2020 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__PLATFORM_SESSION__CLIENT_H_
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#define _INCLUDE__PLATFORM_SESSION__CLIENT_H_
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#include <base/rpc_client.h>
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#include <base/log.h>
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#include <platform_session/capability.h>
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namespace Platform { struct Client; }
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struct Platform::Client : Genode::Rpc_client<Session>
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{
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Client(Session_capability session)
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: Rpc_client<Session>(session) { }
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Rom_session_capability devices_rom() override {
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return call<Rpc_devices_rom>(); }
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Capability<Device_interface> acquire_device(Device_name const &name) override {
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return call<Rpc_acquire_device>(name); }
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Capability<Device_interface> acquire_single_device() override {
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return call<Rpc_acquire_single_device>(); }
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void release_device(Capability<Device_interface> device) override {
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call<Rpc_release_device>(device); }
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Ram_dataspace_capability alloc_dma_buffer(size_t size, Cache cache) override {
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return call<Rpc_alloc_dma_buffer>(size, cache); }
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void free_dma_buffer(Ram_dataspace_capability cap) override {
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call<Rpc_free_dma_buffer>(cap); }
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addr_t dma_addr(Ram_dataspace_capability cap) override
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{
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addr_t const result = call<Rpc_dma_addr>(cap);
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/* the platform driver may lack the 'managing_system' role */
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if (!result)
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warning("unable to obtain DMA address from platform driver");
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return result;
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}
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};
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#endif /* _INCLUDE__PLATFORM_SESSION__CLIENT_H_ */
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