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7f8f0f50ea
Ref #1987 Fix #2058
192 lines
4.6 KiB
C++
192 lines
4.6 KiB
C++
/**
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* \brief Block driver session creation
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* \author Sebastian Sumpf
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* \date 2015-09-29
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*/
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/*
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* Copyright (C) 2016 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 General Public License version 2.
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*/
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/* Genode includes */
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#include <base/attached_rom_dataspace.h>
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#include <base/component.h>
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#include <base/log.h>
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#include <block/component.h>
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#include <os/session_policy.h>
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#include <util/xml_node.h>
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/* local includes */
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#include <ahci.h>
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namespace Block {
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class Factory;
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class Root_multiple_clients;
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class Main;
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}
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struct Block::Factory : Driver_factory
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{
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long device_num;
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Block::Driver *create()
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{
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return Ahci_driver::claim_port(device_num);
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}
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void destroy(Block::Driver *driver)
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{
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Ahci_driver::free_port(device_num);
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}
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Factory(long device_num) : device_num(device_num) { }
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};
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class Session_component : public Block::Session_component
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{
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public:
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Session_component(Block::Driver_factory &driver_factory,
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Genode::Entrypoint &ep,
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Genode::size_t buf_size)
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: Block::Session_component(driver_factory, ep, buf_size) { }
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Block::Driver_factory &factory() { return _driver_factory; }
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};
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class Block::Root_multiple_clients : public Root_component< ::Session_component>,
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public Ahci_root
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{
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private:
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Genode::Env &_env;
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Genode::Allocator &_alloc;
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Genode::Xml_node _config;
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long _device_num(Session_label const &label, char *model, char *sn, size_t bufs_len)
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{
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long num = -1;
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try {
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Session_policy policy(label, _config);
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/* try read device port number attribute */
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try { policy.attribute("device").value(&num); }
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catch (...) { }
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/* try read device model and serial number attributes */
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model[0] = sn[0] = 0;
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policy.attribute("model").value(model, bufs_len);
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policy.attribute("serial").value(sn, bufs_len);
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} catch (...) { }
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return num;
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}
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protected:
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::Session_component *_create_session(const char *args)
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{
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Session_label const label = label_from_args(args);
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size_t ram_quota =
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Arg_string::find_arg(args, "ram_quota").ulong_value(0);
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size_t tx_buf_size =
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Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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if (!tx_buf_size)
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throw Invalid_args();
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size_t session_size = sizeof(::Session_component)
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+ sizeof(Factory) + tx_buf_size;
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if (max((size_t)4096, session_size) > ram_quota) {
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error("insufficient 'ram_quota' from '", label, "',"
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" got ", ram_quota, ", need ", session_size);
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throw Root::Quota_exceeded();
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}
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/* Search for configured device */
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char model_buf[64], sn_buf[64];
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long num = _device_num(label, model_buf, sn_buf, sizeof(model_buf));
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/* prefer model/serial routing */
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if ((model_buf[0] != 0) && (sn_buf[0] != 0))
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num = Ahci_driver::device_number(model_buf, sn_buf);
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if (num < 0) {
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error("rejecting session request, no matching policy for '", label, "'",
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model_buf[0] == 0 ? ""
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: " (model=", (char const *)model_buf, " serial=", (char const *)sn_buf, ")");
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throw Root::Invalid_args();
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}
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if (!Ahci_driver::avail(num)) {
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error("Device ", num, " not available");
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throw Root::Unavailable();
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}
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Factory *factory = new (&_alloc) Factory(num);
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::Session_component *session = new (&_alloc)
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::Session_component(*factory, _env.ep(), tx_buf_size);
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log("session opened at device ", num, " for '", label, "'");
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return session;
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}
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void _destroy_session(::Session_component *session)
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{
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Driver_factory &factory = session->factory();
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destroy(&_alloc, session);
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destroy(&_alloc, &factory);
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}
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public:
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Root_multiple_clients(Genode::Env &env, Genode::Allocator &alloc,
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Genode::Xml_node config)
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:
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Root_component(&env.ep().rpc_ep(), &alloc),
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_env(env), _alloc(alloc), _config(config)
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{ }
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Genode::Entrypoint &entrypoint() override { return _env.ep(); }
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void announce() override
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{
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_env.parent().announce(_env.ep().manage(*this));
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}
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};
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struct Block::Main
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{
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Genode::Env &env;
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Genode::Heap heap { env.ram(), env.rm() };
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Genode::Attached_rom_dataspace config { env, "config" };
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Block::Root_multiple_clients root;
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Main(Genode::Env &env)
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: env(env), root(env, heap, config.xml())
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{
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Genode::log("--- Starting AHCI driver ---");
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bool support_atapi = config.xml().attribute_value("atapi", false);
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Ahci_driver::init(env, heap, root, support_atapi);
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}
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};
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namespace Component {
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Genode::size_t stack_size() { return 2 * 1024 * sizeof(long); }
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void construct(Genode::Env &env) { static Block::Main server(env); }
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}
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