162 lines
3.5 KiB
C++
162 lines
3.5 KiB
C++
/*
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* \brief Backend allocator for DMA-capable memory
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* \author Sebastian Sumpf
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* \author Josef Soentgen
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* \author Norman Feske
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* \date 2014-10-10
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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/* Genode includes */
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#include <base/object_pool.h>
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#include <base/env.h>
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/* XXX only because of struct pci_dev */
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#include <lx_emul.h>
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/* Linux emulation environment includes */
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#include <lx_kit/backend_alloc.h>
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#include <lx_kit/pci_dev_registry.h>
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namespace Lx_kit {
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struct Memory_object_base;
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struct Ram_object;
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struct Dma_object;
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Genode::Object_pool<Memory_object_base> memory_pool;
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};
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struct Lx_kit::Memory_object_base : Genode::Object_pool<Memory_object_base>::Entry
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{
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Memory_object_base(Genode::Ram_dataspace_capability cap)
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: Genode::Object_pool<Memory_object_base>::Entry(cap) {}
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virtual ~Memory_object_base() {};
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virtual void free() = 0;
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Genode::Ram_dataspace_capability ram_cap()
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{
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using namespace Genode;
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return reinterpret_cap_cast<Ram_dataspace>(cap());
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}
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};
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struct Lx_kit::Ram_object : Memory_object_base
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{
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Genode::Ram_allocator &_ram;
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Ram_object(Genode::Ram_allocator &ram,
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Genode::Ram_dataspace_capability cap)
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: Memory_object_base(cap), _ram(ram) {}
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void free() { _ram.free(ram_cap()); }
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};
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struct Lx_kit::Dma_object : Memory_object_base
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{
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Platform::Connection &_pci;
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Dma_object(Platform::Connection &pci,
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Genode::Ram_dataspace_capability cap)
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: Memory_object_base(cap), _pci(pci) {}
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void free() { _pci.free_dma_buffer(ram_cap()); }
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};
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/********************
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** Pci singletons **
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********************/
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static Genode::Constructible<Platform::Connection> _global_pci;
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static Genode::Allocator *_global_md_alloc;
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static Genode::Ram_allocator *_global_ram;
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void Lx::pci_init(Genode::Env &env, Genode::Ram_allocator &ram,
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Genode::Allocator &md_alloc)
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{
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_global_pci.construct(env);
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_global_ram = &ram;
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_global_md_alloc = &md_alloc;
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Lx::pci_dev_registry(&env);
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}
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Platform::Connection *Lx::pci()
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{
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return &*_global_pci;
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}
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Lx::Pci_dev_registry *Lx::pci_dev_registry(Genode::Env *env)
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{
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static Lx::Pci_dev_registry _pci_dev_registry(*env);
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return &_pci_dev_registry;
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}
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/*********************************
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** Lx::Backend_alloc interface **
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*********************************/
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Genode::Ram_dataspace_capability
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Lx::backend_alloc(Genode::addr_t size, Genode::Cache_attribute cached)
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{
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using namespace Genode;
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using namespace Lx_kit;
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Memory_object_base *obj;
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Genode::Ram_dataspace_capability cap;
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if (cached == CACHED) {
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cap = _global_ram->alloc(size);
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obj = new (_global_md_alloc) Ram_object(*_global_ram, cap);
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} else {
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Genode::size_t donate = size;
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cap = retry<Genode::Out_of_ram>(
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[&] () {
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return retry<Genode::Out_of_caps>(
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[&] () { return _global_pci->alloc_dma_buffer(size); },
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[&] () { _global_pci->upgrade_caps(2); });
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},
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[&] () {
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_global_pci->upgrade_ram(donate);
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donate = donate * 2 > size ? 4096 : donate * 2;
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});
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obj = new (_global_md_alloc) Dma_object(*_global_pci, cap);
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}
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memory_pool.insert(obj);
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return cap;
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}
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void Lx::backend_free(Genode::Ram_dataspace_capability cap)
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{
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using namespace Genode;
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using namespace Lx_kit;
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Memory_object_base *object;
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memory_pool.apply(cap, [&] (Memory_object_base *obj) {
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object = obj;
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if (!object) { return; }
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object->free();
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memory_pool.remove(object);
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});
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destroy(_global_md_alloc, object);
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}
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