194 lines
4.1 KiB
C++
194 lines
4.1 KiB
C++
/*
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* \brief Signal context for IRQ's
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* \author Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
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* \date 2012-05-23
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*/
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/*
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* Copyright (C) 2012-2013 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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#include <signal.h>
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#include <irq_session/client.h>
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#include <extern_c_begin.h>
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#include <lx_emul.h>
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#include <extern_c_end.h>
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#include <platform.h>
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/* our local incarnation of sender and receiver */
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static Signal_helper *_signal = 0;
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/**
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* This contains the Linux-driver handlers
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*/
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struct Irq_handler : Genode::List<Irq_handler>::Element
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{
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void *dev; /* Linux device */
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irq_handler_t handler; /* Linux handler */
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Irq_handler(void *dev, irq_handler_t handler)
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: dev(dev), handler(handler) { }
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};
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/**
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* Signal context for IRQs
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*/
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class Irq_context : public Genode::List<Irq_context>::Element
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{
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private:
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typedef Genode::List<Irq_context>::Element LE;
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unsigned int _irq; /* IRQ number */
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Genode::List<Irq_handler> _handler_list; /* List of registered handlers */
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Genode::Signal_rpc_member<Irq_context> _dispatcher;
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Genode::Irq_session_capability _irq_cap;
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Genode::Irq_session_client _irq_client;
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static Genode::List<Irq_context> *_list()
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{
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static Genode::List<Irq_context> _l;
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return &_l;
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}
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/**
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* Find context for given IRQ number
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*/
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static Irq_context *_find_ctx(unsigned int irq)
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{
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for (Irq_context *i = _list()->first(); i; i = i->LE::next())
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if (i->_irq == irq)
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return i;
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return 0;
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}
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/**
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* Call one IRQ handler
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*/
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inline bool _handle_one(Irq_handler *h)
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{
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bool handled = false;
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/*
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* It might be that the next interrupt triggers right after the
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* device has acknowledged the IRQ. To reduce per-IRQ context
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* switches, we merge up to 'MAX_MERGED_IRQS' calls to the
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* interrupt handler.
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*/
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enum { MAX_MERGED_IRQS = 8 };
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for (unsigned i = 0; i < MAX_MERGED_IRQS; i++) {
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if (h->handler(_irq, h->dev) != IRQ_HANDLED)
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break;
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handled = true;
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}
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return handled;
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}
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/**
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* Call all handlers registered for this context
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*/
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bool _handle()
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{
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bool handled = false;
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/* report IRQ to all clients */
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for (Irq_handler *h = _handler_list.first(); h; h = h->next())
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if ((handled = _handle_one(h))) {
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dde_kit_log(DEBUG_IRQ, "IRQ: %u ret: %u h: %p dev: %p", _irq, handled, h->handler, h->dev);
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break;
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}
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/* ack interrupt */
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_irq_client.ack_irq();
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if (handled)
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Routine::schedule_all();
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return handled;
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}
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void _handle(unsigned) { _handle(); }
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public:
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Irq_context(unsigned int irq)
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: _irq(irq),
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_dispatcher(_signal->ep(), *this, &Irq_context::_handle),
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_irq_cap(platform_irq_activate(_irq)),
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_irq_client(_irq_cap)
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{
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if (!_irq_cap.valid()) {
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PERR("Interrupt %d attach failed", irq);
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return;
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}
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_irq_client.sigh(_dispatcher);
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_irq_client.ack_irq();
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_list()->insert(this);
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}
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const char *debug() { return "Irq_context"; }
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/**
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* Request an IRQ
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*/
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static void request_irq(unsigned int irq, irq_handler_t handler, void *dev)
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{
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Irq_handler *h = new(Genode::env()->heap()) Irq_handler(dev, handler);
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Irq_context *ctx = _find_ctx(irq);
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/* if this IRQ is not registered */
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if (!ctx)
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ctx = new (Genode::env()->heap()) Irq_context(irq);
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/* register Linux handler */
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ctx->_handler_list.insert(h);
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}
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static bool check_irq()
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{
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bool handled = false;
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for (Irq_context *i = _list()->first(); i; i = i->LE::next())
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handled |= i->_handle();
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return handled;
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}
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};
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void Irq::init(Server::Entrypoint &ep) {
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_signal = new (Genode::env()->heap()) Signal_helper(ep); }
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void Irq::check_irq()
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{
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Irq_context::check_irq();
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}
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/***********************
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** linux/interrupt.h **
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***********************/
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int request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
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const char *name, void *dev)
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{
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dde_kit_log(DEBUG_IRQ, "Request irq %u handler %p", irq, handler);
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Irq_context::request_irq(irq, handler, dev);
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return 0;
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}
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