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This patch enhances the PD-session interface with the support needed for user-level device drivers performing DMA. Both RPC functions are intended for the direct use by the platform driver only. If invoked for PDs that lack the managing-system role, the operations have no effect. The 'dma_addr()' RPC function allows the platform driver to request the DMA address of a given RAM dataspace. It is meant to replace the 'Dataspace::phys_addr' RPC function. The 'attach_dma' RPC function adds the given dataspace to the device PD's I/O page table. It replaces the former heuristics of marking DMA buffers as uncached RAM on x86. With this patch, the UNCACHED attribute of RAM dataspaces is no longer used to distinguish DMA buffers from regular RAM dataspaces. Issue #2243
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/*
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* \brief Client-side pd session interface
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* \author Christian Helmuth
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* \date 2006-07-12
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*/
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/*
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* Copyright (C) 2006-2017 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__PD_SESSION__CLIENT_H_
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#define _INCLUDE__PD_SESSION__CLIENT_H_
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#include <pd_session/capability.h>
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#include <dataspace/client.h>
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namespace Genode { struct Pd_session_client; }
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struct Genode::Pd_session_client : Rpc_client<Pd_session>
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{
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explicit Pd_session_client(Pd_session_capability session)
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: Rpc_client<Pd_session>(session) { }
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void assign_parent(Capability<Parent> parent) override {
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call<Rpc_assign_parent>(parent); }
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bool assign_pci(addr_t pci_config_memory_address, uint16_t bdf) override {
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return call<Rpc_assign_pci>(pci_config_memory_address, bdf); }
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void map(addr_t virt, addr_t size) override { call<Rpc_map>(virt, size); }
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Signal_source_capability alloc_signal_source() override {
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return call<Rpc_alloc_signal_source>(); }
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void free_signal_source(Signal_source_capability cap) override {
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call<Rpc_free_signal_source>(cap); }
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Signal_context_capability alloc_context(Signal_source_capability source,
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unsigned long imprint) override {
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return call<Rpc_alloc_context>(source, imprint); }
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void free_context(Signal_context_capability cap) override {
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call<Rpc_free_context>(cap); }
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void submit(Signal_context_capability receiver, unsigned cnt = 1) override {
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call<Rpc_submit>(receiver, cnt); }
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Native_capability alloc_rpc_cap(Native_capability ep) override {
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return call<Rpc_alloc_rpc_cap>(ep); }
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void free_rpc_cap(Native_capability cap) override {
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call<Rpc_free_rpc_cap>(cap); }
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Capability<Region_map> address_space() override {
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return call<Rpc_address_space>(); }
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Capability<Region_map> stack_area() override {
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return call<Rpc_stack_area>(); }
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Capability<Region_map> linker_area() override {
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return call<Rpc_linker_area>(); }
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void ref_account(Capability<Pd_session> pd) override {
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call<Rpc_ref_account>(pd); }
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void transfer_quota(Capability<Pd_session> pd, Cap_quota amount) override {
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call<Rpc_transfer_cap_quota>(pd, amount); }
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Cap_quota cap_quota() const override { return call<Rpc_cap_quota>(); }
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Cap_quota used_caps() const override { return call<Rpc_used_caps>(); }
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Alloc_result try_alloc(size_t size, Cache cache = CACHED) override
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{
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return call<Rpc_try_alloc>(size, cache);
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}
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void free(Ram_dataspace_capability ds) override { call<Rpc_free>(ds); }
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size_t dataspace_size(Ram_dataspace_capability ds) const override
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{
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return ds.valid() ? Dataspace_client(ds).size() : 0;
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}
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void transfer_quota(Pd_session_capability pd_session, Ram_quota amount) override {
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call<Rpc_transfer_ram_quota>(pd_session, amount); }
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Ram_quota ram_quota() const override { return call<Rpc_ram_quota>(); }
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Ram_quota used_ram() const override { return call<Rpc_used_ram>(); }
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Capability<Native_pd> native_pd() override { return call<Rpc_native_pd>(); }
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Managing_system_state managing_system(Managing_system_state const & state) override {
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return call<Rpc_managing_system>(state); }
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addr_t dma_addr(Ram_dataspace_capability ds) override { return call<Rpc_dma_addr>(ds); }
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Attach_dma_result attach_dma(Dataspace_capability ds, addr_t at) override {
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return call<Rpc_attach_dma>(ds, at); }
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};
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#endif /* _INCLUDE__PD_SESSION__CLIENT_H_ */
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