mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-30 18:47:01 +00:00
90a6f55f88
The new 'Dma_buffer' utility simplifies the allocation of DMA-capable RAM by device drivers. Issue #4401
136 lines
3.2 KiB
C++
136 lines
3.2 KiB
C++
/*
|
|
* \brief Connection to Platform service
|
|
* \author Stefan Kalkowski
|
|
* \date 2020-05-13
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2020 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 _INCLUDE__PLATFORM_SESSION__CONNECTION_H_
|
|
#define _INCLUDE__PLATFORM_SESSION__CONNECTION_H_
|
|
|
|
#include <base/attached_dataspace.h>
|
|
#include <base/connection.h>
|
|
#include <base/env.h>
|
|
#include <platform_session/client.h>
|
|
#include <rom_session/client.h>
|
|
#include <util/xml_node.h>
|
|
|
|
namespace Platform {
|
|
|
|
struct Device;
|
|
struct Dma_buffer;
|
|
struct Connection;
|
|
}
|
|
|
|
|
|
class Platform::Connection : public Genode::Connection<Session>,
|
|
public Client
|
|
{
|
|
private:
|
|
|
|
/* 'Device' and 'Dma_buffer' access the '_rm' member */
|
|
friend class Device;
|
|
friend class Dma_buffer;
|
|
|
|
Region_map &_rm;
|
|
Rom_session_client _rom {devices_rom()};
|
|
Constructible<Attached_dataspace> _ds {};
|
|
|
|
void _try_attach()
|
|
{
|
|
_ds.destruct();
|
|
try { _ds.construct(_rm, _rom.dataspace()); }
|
|
catch (Attached_dataspace::Invalid_dataspace) {
|
|
warning("Invalid devices rom dataspace returned!");}
|
|
}
|
|
|
|
public:
|
|
|
|
Connection(Env &env)
|
|
:
|
|
Genode::Connection<Session>(env, session(env.parent(),
|
|
"ram_quota=%u, cap_quota=%u",
|
|
RAM_QUOTA, CAP_QUOTA)),
|
|
Client(cap()),
|
|
_rm(env.rm())
|
|
{
|
|
_try_attach();
|
|
}
|
|
|
|
void update()
|
|
{
|
|
if (_ds.constructed() && _rom.update() == true)
|
|
return;
|
|
|
|
_try_attach();
|
|
}
|
|
|
|
void sigh(Signal_context_capability sigh) { _rom.sigh(sigh); }
|
|
|
|
Capability<Device_interface> acquire_device(Device_name const &name) override
|
|
{
|
|
return retry_with_upgrade(Ram_quota{6*1024}, Cap_quota{6}, [&] () {
|
|
return Client::acquire_device(name); });
|
|
}
|
|
|
|
Capability<Device_interface> acquire_device()
|
|
{
|
|
return retry_with_upgrade(Ram_quota{6*1024}, Cap_quota{6}, [&] () {
|
|
return Client::acquire_single_device(); });
|
|
}
|
|
|
|
Ram_dataspace_capability alloc_dma_buffer(size_t size, Cache cache) override
|
|
{
|
|
return retry_with_upgrade(Ram_quota{size}, Cap_quota{2}, [&] () {
|
|
return Client::alloc_dma_buffer(size, cache); });
|
|
}
|
|
|
|
template <typename FN>
|
|
void with_xml(FN const & fn)
|
|
{
|
|
try {
|
|
if (_ds.constructed() && _ds->local_addr<void const>()) {
|
|
Xml_node xml(_ds->local_addr<char>(), _ds->size());
|
|
fn(xml);
|
|
}
|
|
} catch (Xml_node::Invalid_syntax) {
|
|
warning("Devices rom has invalid XML syntax"); }
|
|
}
|
|
|
|
Capability<Device_interface> device_by_type(char const * type)
|
|
{
|
|
using String = Genode::String<64>;
|
|
|
|
Capability<Device_interface> cap;
|
|
|
|
with_xml([&] (Xml_node & xml) {
|
|
xml.for_each_sub_node("device", [&] (Xml_node node) {
|
|
|
|
/* already found a device? */
|
|
if (cap.valid())
|
|
return;
|
|
|
|
if (node.attribute_value("type", String()) != type)
|
|
return;
|
|
|
|
Device_name name = node.attribute_value("name", Device_name());
|
|
cap = acquire_device(name);
|
|
});
|
|
if (!cap.valid()) {
|
|
error(__func__, ": type=", type, " not found!");
|
|
error("device ROM content: ", xml);
|
|
}
|
|
});
|
|
|
|
return cap;
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__PLATFORM_SESSION__CONNECTION_H_ */
|