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-rw-r--r--device/intr.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/device/intr.c b/device/intr.c
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index 0000000..9035c03
--- /dev/null
+++ b/device/intr.c
@@ -0,0 +1,372 @@
+/*
+ * Copyright (c) 2010, 2011, 2016, 2019 Free Software Foundation, Inc.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * THE FREE SOFTWARE FOUNDATIONALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. THE FREE SOFTWARE FOUNDATION DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ */
+
+#include <kern/assert.h>
+#include <device/intr.h>
+#include <device/device_types.h>
+#include <device/device_port.h>
+#include <device/notify.h>
+#include <kern/printf.h>
+#include <machine/spl.h>
+#include <machine/irq.h>
+#include <ipc/ipc_space.h>
+
+#ifndef MACH_XEN
+
+queue_head_t main_intr_queue;
+static boolean_t deliver_intr (int id, ipc_port_t dst_port);
+
+#ifndef LINUX_DEV
+#define SA_SHIRQ 0x04000000
+
+struct intr_list {
+ user_intr_t *user_intr;
+ unsigned long flags;
+ struct intr_list *next;
+};
+static struct intr_list *user_intr_handlers[NINTR];
+#endif
+
+static user_intr_t *
+search_intr (struct irqdev *dev, ipc_port_t dst_port)
+{
+ user_intr_t *e;
+ queue_iterate (dev->intr_queue, e, user_intr_t *, chain)
+ {
+ if (e->dst_port == dst_port)
+ return e;
+ }
+ return NULL;
+}
+
+
+/*
+ * Interrupt handling logic:
+ *
+ * interrupt.S raises spl (thus IF cleared)
+ * interrupt.S EOI
+ * interrupt.S calls the handler
+ * - for pure in-kernel handlers, they do whatever they want with IF cleared.
+ * - when a userland handler is registered, queue_intr masks the irq.
+ * interrupt.S lowers spl with splx_cli, thus IF still cleared
+ * iret, that also sets IF
+ *
+ * later on, (irq_acknowledge), userland acks the IRQ, that unmasks the irq
+ */
+kern_return_t
+irq_acknowledge (ipc_port_t receive_port)
+{
+ user_intr_t *e;
+ kern_return_t ret = 0;
+
+ spl_t s = splhigh ();
+ e = search_intr (&irqtab, receive_port);
+
+ if (!e)
+ {
+ printf("didn't find user intr for interrupt !?\n");
+ ret = KERN_INVALID_ARGUMENT;
+ }
+ else
+ {
+ if (!e->n_unacked)
+ ret = D_INVALID_OPERATION;
+ else
+ e->n_unacked--;
+ }
+ splx (s);
+
+ if (ret)
+ return ret;
+
+ __enable_irq (irqtab.irq[e->id]);
+
+ return D_SUCCESS;
+}
+
+/* This function can only be used in the interrupt handler. */
+static void
+queue_intr (struct irqdev *dev, int id, user_intr_t *e)
+{
+ /* Until userland has handled the IRQ in the driver, we have to keep it
+ * disabled. Level-triggered interrupts would keep raising otherwise. */
+ __disable_irq (dev->irq[id]);
+
+ spl_t s = splhigh ();
+ e->n_unacked++;
+ e->interrupts++;
+ dev->tot_num_intr++;
+ splx (s);
+
+ thread_wakeup ((event_t) &intr_thread);
+}
+
+int
+deliver_user_intr (struct irqdev *dev, int id, user_intr_t *e)
+{
+ /* The reference of the port was increased
+ * when the port was installed. If the reference is 1, it means
+ * the port was deallocated and we should clean after it. */
+ if (!e->dst_port || e->dst_port->ip_references == 1)
+ {
+ thread_wakeup ((event_t) &intr_thread);
+ return 0;
+ }
+ else
+ {
+ queue_intr (dev, id, e);
+ return 1;
+ }
+}
+
+/* insert an interrupt entry in the queue.
+ * This entry exists in the queue until
+ * the corresponding interrupt port is removed.*/
+user_intr_t *
+insert_intr_entry (struct irqdev *dev, int id, ipc_port_t dst_port)
+{
+ user_intr_t *e, *new, *ret;
+ int free = 0;
+
+ new = (user_intr_t *) kalloc (sizeof (*new));
+ if (new == NULL)
+ return NULL;
+
+ /* check whether the intr entry has been in the queue. */
+ spl_t s = splhigh ();
+ e = search_intr (dev, dst_port);
+ if (e)
+ {
+ printf ("the interrupt entry for irq[%d] and port %p has already been inserted\n", id, dst_port);
+ free = 1;
+ ret = NULL;
+ goto out;
+ }
+ printf("irq handler [%d]: new delivery port %p entry %p\n", id, dst_port, new);
+ ret = new;
+ new->id = id;
+ new->dst_port = dst_port;
+ new->interrupts = 0;
+ new->n_unacked = 0;
+
+ queue_enter (dev->intr_queue, new, user_intr_t *, chain);
+out:
+ splx (s);
+ if (free)
+ kfree ((vm_offset_t) new, sizeof (*new));
+ return ret;
+}
+
+#ifndef LINUX_DEV
+
+static void
+user_irq_handler (int id)
+{
+ struct intr_list *handler;
+ struct intr_list **prev = &user_intr_handlers[id];
+ user_intr_t *e;
+ spl_t s;
+
+ s = splhigh();
+
+ for (handler = *prev; handler; handler = handler->next)
+ {
+ e = handler->user_intr;
+ if (!deliver_user_intr(&irqtab, id, e))
+ {
+ /* We failed to deliver this interrupt, remove handler from list */
+ *prev = handler->next;
+ }
+ prev = &handler->next;
+ }
+ splx(s);
+}
+
+int
+install_user_intr_handler (struct irqdev *dev, int id, unsigned long flags,
+ user_intr_t *user_intr)
+{
+ unsigned int irq = dev->irq[id];
+ struct intr_list **head = &user_intr_handlers[id];
+ struct intr_list *new, *old = *head;
+ spl_t s;
+
+ flags |= SA_SHIRQ;
+
+ assert (irq < NINTR);
+
+ /* Don't allow overriding hardclock/kdintr etc */
+ if ((ivect[irq] != user_irq_handler) && (ivect[irq] != intnull))
+ {
+ printf("You can't have this interrupt\n");
+ return D_ALREADY_OPEN;
+ }
+
+ if (old)
+ {
+ if (!(old->flags & flags & SA_SHIRQ))
+ {
+ printf ("Cannot share irq\n");
+ return D_ALREADY_OPEN;
+ }
+ }
+
+ new = (struct intr_list *)kalloc (sizeof (struct intr_list));
+ new->user_intr = user_intr;
+ new->flags = flags;
+
+ s = splhigh();
+ new->next = *head;
+ *head = new;
+ ivect[irq] = user_irq_handler;
+ iunit[irq] = (int)irq;
+ unmask_irq (irq);
+ splx(s);
+
+ return D_SUCCESS;
+}
+#endif
+
+void
+intr_thread (void)
+{
+ user_intr_t *e;
+ int id;
+ ipc_port_t dst_port;
+ queue_init (&main_intr_queue);
+
+ for (;;)
+ {
+ assert_wait ((event_t) &intr_thread, FALSE);
+ /* Make sure we wake up from times to times to check for aborted processes */
+ thread_set_timeout (hz);
+ spl_t s = splhigh ();
+
+ /* Now check for interrupts */
+ int del;
+ do
+ {
+ del = 0;
+
+ queue_iterate (&main_intr_queue, e, user_intr_t *, chain)
+ {
+ /* The reference of the port was increased
+ * when the port was installed. If the reference is 1, it means
+ * the port was deallocated and we should clean after it. */
+ if (e->dst_port->ip_references == 1)
+ {
+ clear_wait (current_thread (), 0, 0);
+ del = 1;
+ break;
+ }
+
+ if (e->interrupts)
+ {
+ clear_wait (current_thread (), 0, 0);
+ id = e->id;
+ dst_port = e->dst_port;
+ e->interrupts--;
+ irqtab.tot_num_intr--;
+
+ splx (s);
+ deliver_intr (id, dst_port);
+ s = splhigh ();
+ }
+ }
+
+ /* remove the entry without dest port from the queue and free it. */
+ if (del)
+ {
+ /*
+ * We clear unacked irqs now, so the Linux handling can trigger,
+ * and we will cleanup later after the Linux handler is cleared.
+ */
+ assert (!queue_empty (&main_intr_queue));
+ queue_remove (&main_intr_queue, e, user_intr_t *, chain);
+
+ printf ("irq handler [%d]: release a dead delivery port %p entry %p\n", e->id, e->dst_port, e);
+ ipc_port_release (e->dst_port);
+ e->dst_port = MACH_PORT_NULL;
+
+ if (e->n_unacked)
+ printf("irq handler [%d]: still %d unacked irqs in entry %p\n", e->id, e->n_unacked, e);
+ while (e->n_unacked)
+ {
+ __enable_irq (irqtab.irq[e->id]);
+ e->n_unacked--;
+ }
+
+#if 0
+#ifndef LINUX_DEV
+ // TODO: remove from the action list
+#else
+ // FIXME: with the Linux irq handler we don't actually control the action list
+#endif
+ splx (s);
+ kfree ((vm_offset_t) e, sizeof (*e));
+ s = splhigh ();
+#endif
+ }
+ }
+ while (del || irqtab.tot_num_intr);
+ splx (s);
+ thread_block (NULL);
+ }
+}
+
+static boolean_t
+deliver_intr (int id, ipc_port_t dst_port)
+{
+ ipc_kmsg_t kmsg;
+ device_intr_notification_t *n;
+ mach_port_t dest = (mach_port_t) dst_port;
+
+ if (dest == MACH_PORT_NULL)
+ return FALSE;
+
+ kmsg = ikm_alloc(sizeof *n);
+ if (kmsg == IKM_NULL)
+ return FALSE;
+
+ ikm_init(kmsg, sizeof *n);
+ n = (device_intr_notification_t *) &kmsg->ikm_header;
+
+ mach_msg_header_t *m = &n->intr_header;
+ mach_msg_type_t *t = &n->intr_type;
+
+ m->msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_PORT_SEND, 0);
+ m->msgh_size = sizeof *n;
+ m->msgh_seqno = DEVICE_NOTIFY_MSGH_SEQNO;
+ m->msgh_local_port = MACH_PORT_NULL;
+ m->msgh_remote_port = MACH_PORT_NULL;
+ m->msgh_id = DEVICE_INTR_NOTIFY;
+
+ t->msgt_name = MACH_MSG_TYPE_INTEGER_32;
+ t->msgt_size = 32;
+ t->msgt_number = 1;
+ t->msgt_inline = TRUE;
+ t->msgt_longform = FALSE;
+ t->msgt_deallocate = FALSE;
+ t->msgt_unused = 0;
+
+ n->intr_header.msgh_remote_port = dest;
+ n->id = id;
+
+ ipc_port_copy_send (dst_port);
+ ipc_mqueue_send_always(kmsg);
+
+ return TRUE;
+}
+
+#endif /* MACH_XEN */
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