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genode/repos/os/src/drivers/pci/pci_session_component.h

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/*
* \brief PCI-session component
* \author Norman Feske
* \date 2008-01-28
*/
/*
* Copyright (C) 2008-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _PCI_SESSION_COMPONENT_H_
#define _PCI_SESSION_COMPONENT_H_
#include <base/rpc_server.h>
#include <pci_session/pci_session.h>
#include <root/component.h>
#include <io_mem_session/connection.h>
#include <os/config.h>
#include "pci_device_component.h"
#include "pci_config_access.h"
#include "pci_device_pd_ipc.h"
namespace Pci {
/**
* Check if given PCI bus was found on initial scan
*
* This tremendously speeds up further scans by other drivers.
*/
bool bus_valid(int bus = 0)
{
struct Valid_buses
{
bool valid[Device_config::MAX_BUSES];
void scan_bus(Config_access &config_access, int bus = 0)
{
for (int dev = 0; dev < Device_config::MAX_DEVICES; ++dev) {
for (int fun = 0; fun < Device_config::MAX_FUNCTIONS; ++fun) {
/* read config space */
Device_config config(bus, dev, fun, &config_access);
if (!config.valid())
continue;
/*
* There is at least one device on the current bus, so
* we mark it as valid.
*/
valid[bus] = true;
/* scan behind bridge */
if (config.is_pci_bridge()) {
int sub_bus = config.read(&config_access,
0x19, Device::ACCESS_8BIT);
scan_bus(config_access, sub_bus);
}
}
}
}
Valid_buses() { Config_access c; scan_bus(c); }
};
static Valid_buses buses;
return buses.valid[bus];
}
class Session_component : public Genode::Rpc_object<Session>
{
private:
Genode::Rpc_entrypoint *_ep;
Genode::Allocator *_md_alloc;
Genode::List<Device_component> _device_list;
Device_pd_client *_child;
Genode::Ram_connection *_ram;
/**
* Scan PCI buses for a device
*
* \param bus start scanning at bus number
* \param device start scanning at device number
* \param function start scanning at function number
* \param out_device_config device config information of the
* found device
* \param config_access interface for accessing the PCI
* configuration
* space
*
* \retval true device was found
* \retval false no device was found
*/
bool _find_next(int bus, int device, int function,
Device_config *out_device_config,
Config_access *config_access)
{
for (; bus < Device_config::MAX_BUSES; bus++) {
if (!bus_valid(bus))
continue;
for (; device < Device_config::MAX_DEVICES; device++) {
for (; function < Device_config::MAX_FUNCTIONS; function++) {
/* read config space */
Device_config config(bus, device, function, config_access);
if (config.valid()) {
*out_device_config = config;
return true;
}
}
function = 0; /* init value for next device */
}
device = 0; /* init value for next bus */
}
return false;
}
/**
* List containing extended PCI config space information
*/
static Genode::List<Config_space> &config_space_list() {
static Genode::List<Config_space> config_space;
return config_space;
}
/**
* Find for a given PCI device described by the bus:dev:func triple
* the corresponding extended 4K PCI config space address.
* A io mem dataspace is created and returned.
*/
Genode::addr_t
lookup_config_space(Genode::uint8_t bus, Genode::uint8_t dev,
Genode::uint8_t func)
{
using namespace Genode;
uint32_t bdf = (bus << 8) | ((dev & 0x1f) << 3) | (func & 0x7);
addr_t config_space = ~0UL; /* invalid */
Config_space *e = config_space_list().first();
for (; e && (config_space == ~0UL); e = e->next())
config_space = e->lookup_config_space(bdf);
return config_space;
}
public:
/**
* Constructor
*/
Session_component(Genode::Rpc_entrypoint *ep,
Genode::Allocator *md_alloc,
Device_pd_client *child,
Genode::Ram_connection *ram)
:
_ep(ep), _md_alloc(md_alloc), _child(child), _ram(ram) { }
/**
* Destructor
*/
~Session_component()
{
/* release all elements of the session's device list */
while (_device_list.first())
release_device(_device_list.first()->cap());
}
static void add_config_space(Genode::uint32_t bdf_start,
Genode::uint32_t func_count,
Genode::addr_t base)
{
using namespace Genode;
Config_space * space =
new (env()->heap()) Config_space(bdf_start, func_count,
base);
config_space_list().insert(space);
}
/***************************
** PCI session interface **
***************************/
Device_capability first_device(unsigned device_class,
unsigned class_mask) {
return next_device(Device_capability(), device_class, class_mask); }
Device_capability next_device(Device_capability prev_device,
unsigned device_class,
unsigned class_mask)
{
/*
* Create the interface to the PCI config space.
* This involves the creation of I/O port sessions.
*/
Config_access config_access;
/* lookup device component for previous device */
Genode::Object_pool<Device_component>::Guard
prev(_ep->lookup_and_lock(prev_device));
/*
* Start bus scanning after the previous device's location.
* If no valid device was specified for 'prev_device', start at
* the beginning.
*/
int bus = 0, device = 0, function = -1;
if (prev) {
Device_config config = prev->config();
bus = config.bus_number();
device = config.device_number();
function = config.function_number();
}
/*
* Scan buses for devices.
* If no device is found, return an invalid capability.
*/
Device_config config;
do
{
function += 1;
if (!_find_next(bus, device, function, &config, &config_access))
return Device_capability();
/* get new bdf values */
bus = config.bus_number();
device = config.device_number();
function = config.function_number();
} while ((config.class_code() ^ device_class) & class_mask);
/* lookup if we have a extended pci config space */
Genode::addr_t config_space = lookup_config_space(bus, device,
function);
/*
* A device was found. Create a new device component for the
* device and return its capability.
*
* FIXME: check and adjust session quota
*/
Device_component *device_component =
new (_md_alloc) Device_component(config, config_space, _ep);
if (!device_component)
return Device_capability();
_device_list.insert(device_component);
return _ep->manage(device_component);
}
void release_device(Device_capability device_cap)
{
/* lookup device component for previous device */
Device_component *device = dynamic_cast<Device_component *>
(_ep->lookup_and_lock(device_cap));
if (!device)
return;
_device_list.remove(device);
_ep->dissolve(device);
/* FIXME: adjust quota */
Genode::Io_mem_connection * io_mem = device->get_config_space();
if (io_mem)
destroy(_md_alloc, io_mem);
destroy(_md_alloc, device);
}
Genode::Io_mem_dataspace_capability config_extended(Device_capability device_cap)
{
using namespace Genode;
Object_pool<Device_component>::Guard
device(_ep->lookup_and_lock(device_cap));
if (!device || device->config_space() == ~0UL)
return Io_mem_dataspace_capability();
Io_mem_connection * io_mem = device->get_config_space();
if (io_mem)
return io_mem->dataspace();
try {
io_mem = new (_md_alloc) Io_mem_connection(device->config_space(),
0x1000);
} catch (Parent::Service_denied) {
return Io_mem_dataspace_capability();
}
device->set_config_space(io_mem);
if (_child)
_child->assign_pci(io_mem->dataspace());
return io_mem->dataspace();
}
/**
* De-/Allocation of dma capable dataspaces
*/
typedef Genode::Ram_dataspace_capability Ram_capability;
Ram_capability alloc_dma_buffer(Device_capability device_cap,
Genode::size_t size)
{
if (Genode::env()->ram_session()->transfer_quota(_ram->cap(),
size))
return Ram_capability();
Ram_capability ram = _ram->alloc(size, Genode::UNCACHED);
if (!ram.valid() || !_child)
return ram;
_child->attach_dma_mem(ram);
return ram;
}
void free_dma_buffer(Device_capability, Ram_capability ram)
{
if (ram.valid())
_ram->free(ram);
}
};
class Root : public Genode::Root_component<Session_component>
{
private:
/* for now we have only one device pd for all pci devices */
Device_pd_client *_pd_device_client;
/* Ram_session for allocation of dma capable dataspaces */
Genode::Ram_connection _ram;
void _parse_config()
{
using namespace Genode;
/* check for config file first */
try { config(); } catch (...) { return; }
try {
unsigned i;
for (i = 0; i < config()->xml_node().num_sub_nodes(); i++)
{
Xml_node node = config()->xml_node().sub_node(i);
uint32_t bdf_start = 0;
uint32_t func_count = 0;
addr_t base = 0;
node.sub_node("start").value(&bdf_start);
node.sub_node("count").value(&func_count);
node.sub_node("base").value(&base);
PINF("%2u BDF start %x, functions: 0x%x, physical base "
"0x%lx", i, bdf_start, func_count, base);
Session_component::add_config_space(bdf_start,
func_count, base);
}
} catch (...) {
PERR("PCI config space data could not be parsed.");
}
}
protected:
Session_component *_create_session(const char *args)
{
/* FIXME: extract quota from args */
/* FIXME: pass quota to session-component constructor */
return new (md_alloc()) Session_component(ep(), md_alloc(),
_pd_device_client,
&_ram);
}
public:
/**
* Constructor
*
* \param ep entry point to be used for serving the PCI session and
* PCI device interface
* \param md_alloc meta-data allocator for allocating PCI-session
* components and PCI-device components
*/
Root(Genode::Rpc_entrypoint *ep, Genode::Allocator *md_alloc,
Genode::size_t pci_device_pd_ram_quota,
Genode::Capability <Device_pd> pci_device_pd)
:
Genode::Root_component<Session_component>(ep, md_alloc),
_pd_device_client(0),
/* restrict physical address to 4G on 32/64bit in general XXX */
/* restrict physical address to 3G on 32bit with device_pd */
_ram("dma", 0, (pci_device_pd.valid() && sizeof(void *) == 4) ?
0xc0000000UL : 0x100000000ULL)
{
_parse_config();
if (pci_device_pd.valid())
_pd_device_client = new (md_alloc) Device_pd_client(pci_device_pd);
/* associate _ram session with ram_session of process */
_ram.ref_account(Genode::env()->ram_session_cap());
Genode::env()->ram_session()->transfer_quota(_ram.cap(), 0x1000);
/* enforce initial bus scan */
bus_valid();
}
};
}
#endif /* _PCI_SESSION_COMPONENT_H_ */
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