WebSVN – HelenOS – Diff – //branches/rcu/kernel/generic/src/ddi/irq.c

 /*
  * Copyright (c) 2006 Jakub Jermar
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup genericddi
  * @{
  */
 /**
  * @file
  * @brief   IRQ dispatcher.
  *
  * This file provides means of connecting IRQs with particular
  * devices and logic for dispatching interrupts to IRQ handlers
  * defined by those devices.
  *
  * This code is designed to support:
  * - multiple devices sharing single IRQ
  * - multiple IRQs per signle device
  *
  *
  * Note about architectures.
  *
  * Some architectures has the term IRQ well defined. Examples
  * of such architectures include amd64, ia32 and mips32. Some
  * other architectures, such as sparc64, don't use the term
  * at all. In those cases, we boldly step forward and define what
  * an IRQ is.
  *
  * The implementation is generic enough and still allows the
  * architectures to use the hardware layout effectively.
  * For instance, on amd64 and ia32, where there is only 16
  * IRQs, the irq_hash_table can be optimized to a one-dimensional
  * array. Next, when it is known that the IRQ numbers (aka INR's)
  * are unique, the claim functions can always return IRQ_ACCEPT.
  *
  *
  * Note about the irq_hash_table.
  *
  * The hash table is configured to use two keys: inr and devno.
  * However, the hash index is computed only from inr. Moreover,
  * if devno is -1, the match is based on the return value of
  * the claim() function instead of on devno.
  */
 #include <ddi/irq.h>
 #include <adt/hash_table.h>
 #include <arch/types.h>
 #include <synch/spinlock.h>
 #include <arch.h>
 #define KEY_INR     0
 #define KEY_DEVNO   1
 /**
  * Spinlock protecting the hash table.
  * This lock must be taken only when interrupts are disabled.
  */
 SPINLOCK_INITIALIZE(irq_hash_table_lock);
 static hash_table_t irq_hash_table;
 /**
  * Hash table operations for cases when we know that
  * there will be collisions between different keys.
  */
 static index_t irq_ht_hash(unative_t *key);
 static bool irq_ht_compare(unative_t *key, count_t keys, link_t *item);
 static hash_table_operations_t irq_ht_ops = {
     .hash = irq_ht_hash,
     .compare = irq_ht_compare,
     .remove_callback = NULL     /* not used */
 };
 /**
  * Hash table operations for cases when we know that
  * there will be no collisions between different keys.
  * However, there might be still collisions among
  * elements with single key (sharing of one IRQ).
  */
 static index_t irq_lin_hash(unative_t *key);
 static bool irq_lin_compare(unative_t *key, count_t keys, link_t *item);
 static hash_table_operations_t irq_lin_ops = {
     .hash = irq_lin_hash,
     .compare = irq_lin_compare,
     .remove_callback = NULL     /* not used */
 };
 /** Initialize IRQ subsystem.
  *
  * @param inrs Numbers of unique IRQ numbers or INRs.
  * @param chains Number of chains in the hash table.
  */
 void irq_init(count_t inrs, count_t chains)
 {
     /*
      * Be smart about the choice of the hash table operations.
      * In cases in which inrs equals the requested number of
      * chains (i.e. where there is no collision between
      * different keys), we can use optimized set of operations.
      */
     if (inrs == chains)
         hash_table_create(&irq_hash_table, chains, 2, &irq_lin_ops);
     else
         hash_table_create(&irq_hash_table, chains, 2, &irq_ht_ops);
 }
 /** Initialize one IRQ structure.
  *
  * @param irq Pointer to the IRQ structure to be initialized.
  *
  */
 void irq_initialize(irq_t *irq)
 {
     link_initialize(&irq->link);
     spinlock_initialize(&irq->lock, "irq.lock");
-    irq->preack = false;
+    irq->inr = -1;
-    irq->inr = -1;
+    irq->devno = -1;
-    irq->devno = -1;
+    irq->trigger = (irq_trigger_t) 0;
-    irq->trigger = (irq_trigger_t) 0;
+    irq->claim = NULL;
-    irq->claim = NULL;
+    irq->handler = NULL;
-    irq->handler = NULL;
+    irq->arg = NULL;
-    irq->arg = NULL;
+    irq->notif_cfg.notify = false;
-    irq->notif_cfg.notify = false;
+    irq->notif_cfg.answerbox = NULL;
-    irq->notif_cfg.answerbox = NULL;
+    irq->notif_cfg.code = NULL;
-    irq->notif_cfg.code = NULL;
+    irq->notif_cfg.method = 0;
-    irq->notif_cfg.method = 0;
+    irq->notif_cfg.counter = 0;
-    irq->notif_cfg.counter = 0;
+    link_initialize(&irq->notif_cfg.link);
-    link_initialize(&irq->notif_cfg.link);
+}
-}
+/** Register IRQ for device.
-/** Register IRQ for device.
+ *
- *
+ * The irq structure must be filled with information
- * The irq structure must be filled with information
+ * about the interrupt source and with the claim()
- * about the interrupt source and with the claim()
+ * function pointer and irq_handler() function pointer.
- * function pointer and irq_handler() function pointer.
+ *
- *
+ * @param irq IRQ structure belonging to a device.
- * @param irq IRQ structure belonging to a device.
+ */
- */
+void irq_register(irq_t *irq)
-void irq_register(irq_t *irq)
+{
-{
+    ipl_t ipl;
-    ipl_t ipl;
+    unative_t key[] = {
-    unative_t key[] = {
+        (unative_t) irq->inr,
-        (unative_t) irq->inr,
+        (unative_t) irq->devno
-        (unative_t) irq->devno
+    };
-    };
+    ipl = interrupts_disable();
-    ipl = interrupts_disable();
+    spinlock_lock(&irq_hash_table_lock);
-    spinlock_lock(&irq_hash_table_lock);
+    hash_table_insert(&irq_hash_table, key, &irq->link);
-    hash_table_insert(&irq_hash_table, key, &irq->link);
+    spinlock_unlock(&irq_hash_table_lock);
-    spinlock_unlock(&irq_hash_table_lock);
+    interrupts_restore(ipl);
-    interrupts_restore(ipl);
+}
-}
+/** Dispatch the IRQ.
-/** Dispatch the IRQ.
+ *
- *
+ * We assume this function is only called from interrupt
- * We assume this function is only called from interrupt
+ * context (i.e. that interrupts are disabled prior to
- * context (i.e. that interrupts are disabled prior to
+ * this call).
- * this call).
+ *
- *
+ * This function attempts to lookup a fitting IRQ
- * This function attempts to lookup a fitting IRQ
+ * structure. In case of success, return with interrupts
- * structure. In case of success, return with interrupts
+ * disabled and holding the respective structure.
- * disabled and holding the respective structure.
+ *
- *
+ * @param inr Interrupt number (aka inr or irq).
- * @param inr Interrupt number (aka inr or irq).
+ *
- *
+ * @return IRQ structure of the respective device or NULL.
- * @return IRQ structure of the respective device or NULL.
+ */
- */
+irq_t *irq_dispatch_and_lock(inr_t inr)
-irq_t *irq_dispatch_and_lock(inr_t inr)
+{
-{
+    link_t *lnk;
-    link_t *lnk;
+    unative_t key[] = {
-    unative_t key[] = {
+        (unative_t) inr,
-        (unative_t) inr,
+        (unative_t) -1      /* search will use claim() instead of devno */
-        (unative_t) -1      /* search will use claim() instead of devno */
+    };
-    };
+    spinlock_lock(&irq_hash_table_lock);
-    spinlock_lock(&irq_hash_table_lock);
+    lnk = hash_table_find(&irq_hash_table, key);
-    lnk = hash_table_find(&irq_hash_table, key);
+    if (lnk) {
-    if (lnk) {
+        irq_t *irq;
-        irq_t *irq;
+        irq = hash_table_get_instance(lnk, irq_t, link);
-        irq = hash_table_get_instance(lnk, irq_t, link);
+        spinlock_unlock(&irq_hash_table_lock);
-        spinlock_unlock(&irq_hash_table_lock);
+        return irq;
-        return irq;
+    }
-    }
+    spinlock_unlock(&irq_hash_table_lock);
-    spinlock_unlock(&irq_hash_table_lock);
+    return NULL;
-    return NULL;
+}
-}
+/** Find the IRQ structure corresponding to inr and devno.
-/** Find the IRQ structure corresponding to inr and devno.
+ *
- *
+ * This functions attempts to lookup the IRQ structure
- * This functions attempts to lookup the IRQ structure
+ * corresponding to its arguments. On success, this
- * corresponding to its arguments. On success, this
+ * function returns with interrups disabled, holding
- * function returns with interrups disabled, holding
+ * the lock of the respective IRQ structure.
- * the lock of the respective IRQ structure.
+ *
- *
+ * This function assumes interrupts are already disabled.
- * This function assumes interrupts are already disabled.
+ *
- *
+ * @param inr INR being looked up.
- * @param inr INR being looked up.
+ * @param devno Devno being looked up.
- * @param devno Devno being looked up.
+ *
- *
+ * @return Locked IRQ structure on success or NULL on failure.
- * @return Locked IRQ structure on success or NULL on failure.
+ */
- */
+irq_t *irq_find_and_lock(inr_t inr, devno_t devno)
-irq_t *irq_find_and_lock(inr_t inr, devno_t devno)
+{
-{
+    link_t *lnk;
-    link_t *lnk;
+    unative_t keys[] = {
-    unative_t keys[] = {
+        (unative_t) inr,
-        (unative_t) inr,
+        (unative_t) devno
-        (unative_t) devno
+    };
-    };
+    spinlock_lock(&irq_hash_table_lock);
-    spinlock_lock(&irq_hash_table_lock);
+    lnk = hash_table_find(&irq_hash_table, keys);
-    lnk = hash_table_find(&irq_hash_table, keys);
+    if (lnk) {
-    if (lnk) {
+        irq_t *irq;
-        irq_t *irq;
+        irq = hash_table_get_instance(lnk, irq_t, link);
-        irq = hash_table_get_instance(lnk, irq_t, link);
+        spinlock_unlock(&irq_hash_table_lock);
-        spinlock_unlock(&irq_hash_table_lock);
+        return irq;
-        return irq;
+    }
-    }
+    spinlock_unlock(&irq_hash_table_lock);
-    spinlock_unlock(&irq_hash_table_lock);
+    return NULL;
-    return NULL;
+}
-}
+/** Compute hash index for the key.
-/** Compute hash index for the key.
+ *
- *
+ * This function computes hash index into
- * This function computes hash index into
+ * the IRQ hash table for which there
- * the IRQ hash table for which there
+ * can be collisions between different
- * can be collisions between different
+ * INRs.
- * INRs.
+ *
- *
+ * The devno is not used to compute the hash.
- * The devno is not used to compute the hash.
+ *
- *
+ * @param key The first of the keys is inr and the second is devno or -1.
- * @param key The first of the keys is inr and the second is devno or -1.
+ *
- *
+ * @return Index into the hash table.
- * @return Index into the hash table.
+ */
- */
+index_t irq_ht_hash(unative_t key[])
-index_t irq_ht_hash(unative_t key[])
+{
-{
+    inr_t inr = (inr_t) key[KEY_INR];
-    inr_t inr = (inr_t) key[KEY_INR];
+    return inr % irq_hash_table.entries;
-    return inr % irq_hash_table.entries;
+}
-}
+/** Compare hash table element with a key.
-/** Compare hash table element with a key.
+ *
- *
+ * There are two things to note about this function.
- * There are two things to note about this function.
+ * First, it is used for the more complex architecture setup
- * First, it is used for the more complex architecture setup
+ * in which there are way too many interrupt numbers (i.e. inr's)
- * in which there are way too many interrupt numbers (i.e. inr's)
+ * to arrange the hash table so that collisions occur only
- * to arrange the hash table so that collisions occur only
+ * among same inrs of different devnos. So the explicit check
- * among same inrs of different devnos. So the explicit check
+ * for inr match must be done.
- * for inr match must be done.
+ * Second, if devno is -1, the second key (i.e. devno) is not
- * Second, if devno is -1, the second key (i.e. devno) is not
+ * used for the match and the result of the claim() function
- * used for the match and the result of the claim() function
+ * is used instead.
- * is used instead.
+ *
- *
+ * This function assumes interrupts are already disabled.
- * This function assumes interrupts are already disabled.
+ *
- *
+ * @param key Keys (i.e. inr and devno).
- * @param key Keys (i.e. inr and devno).
+ * @param keys This is 2.
- * @param keys This is 2.
+ * @param item The item to compare the key with.
- * @param item The item to compare the key with.
+ *
- *
+ * @return True on match or false otherwise.
- * @return True on match or false otherwise.
+ */
- */
+bool irq_ht_compare(unative_t key[], count_t keys, link_t *item)
-bool irq_ht_compare(unative_t key[], count_t keys, link_t *item)
+{
-{
+    irq_t *irq = hash_table_get_instance(item, irq_t, link);
-    irq_t *irq = hash_table_get_instance(item, irq_t, link);
+    inr_t inr = (inr_t) key[KEY_INR];
-    inr_t inr = (inr_t) key[KEY_INR];
+    devno_t devno = (devno_t) key[KEY_DEVNO];
-    devno_t devno = (devno_t) key[KEY_DEVNO];
+    bool rv;
-    bool rv;
+    spinlock_lock(&irq->lock);
-    spinlock_lock(&irq->lock);
+    if (devno == -1) {
-    if (devno == -1) {
+        /* Invoked by irq_dispatch_and_lock(). */
-        /* Invoked by irq_dispatch_and_lock(). */
+        rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
-        rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
+    } else {
-    } else {
+        /* Invoked by irq_find_and_lock(). */
-        /* Invoked by irq_find_and_lock(). */
+        rv = ((irq->inr == inr) && (irq->devno == devno));
-        rv = ((irq->inr == inr) && (irq->devno == devno));
+    }
-    }
+    /* unlock only on non-match */
-    /* unlock only on non-match */
+    if (!rv)
-    if (!rv)
+        spinlock_unlock(&irq->lock);
-        spinlock_unlock(&irq->lock);
+    return rv;
-    return rv;
+}
-}
+/** Compute hash index for the key.
-/** Compute hash index for the key.
+ *
- *
+ * This function computes hash index into
- * This function computes hash index into
+ * the IRQ hash table for which there
- * the IRQ hash table for which there
+ * are no collisions between different
- * are no collisions between different
+ * INRs.
- * INRs.
+ *
- *
+ * @param key The first of the keys is inr and the second is devno or -1.
- * @param key The first of the keys is inr and the second is devno or -1.
+ *
- *
+ * @return Index into the hash table.
- * @return Index into the hash table.
+ */
- */
+index_t irq_lin_hash(unative_t key[])
-index_t irq_lin_hash(unative_t key[])
+{
-{
+    inr_t inr = (inr_t) key[KEY_INR];
-    inr_t inr = (inr_t) key[KEY_INR];
+    return inr;
-    return inr;
+}
-}
+/** Compare hash table element with a key.
-/** Compare hash table element with a key.
+ *
- *
+ * There are two things to note about this function.
- * There are two things to note about this function.
+ * First, it is used for the less complex architecture setup
- * First, it is used for the less complex architecture setup
+ * in which there are not too many interrupt numbers (i.e. inr's)
- * in which there are not too many interrupt numbers (i.e. inr's)
+ * to arrange the hash table so that collisions occur only
- * to arrange the hash table so that collisions occur only
+ * among same inrs of different devnos. So the explicit check
- * among same inrs of different devnos. So the explicit check
+ * for inr match is not done.
- * for inr match is not done.
+ * Second, if devno is -1, the second key (i.e. devno) is not
- * Second, if devno is -1, the second key (i.e. devno) is not
+ * used for the match and the result of the claim() function
- * used for the match and the result of the claim() function
+ * is used instead.
- * is used instead.
+ *
- *
+ * This function assumes interrupts are already disabled.
- * This function assumes interrupts are already disabled.
+ *
- *
+ * @param key Keys (i.e. inr and devno).
- * @param key Keys (i.e. inr and devno).
+ * @param keys This is 2.
- * @param keys This is 2.
+ * @param item The item to compare the key with.
- * @param item The item to compare the key with.
+ *
- *
+ * @return True on match or false otherwise.
- * @return True on match or false otherwise.
+ */
- */
+bool irq_lin_compare(unative_t key[], count_t keys, link_t *item)
-bool irq_lin_compare(unative_t key[], count_t keys, link_t *item)
+{
-{
+    irq_t *irq = list_get_instance(item, irq_t, link);
-    irq_t *irq = list_get_instance(item, irq_t, link);
+    devno_t devno = (devno_t) key[KEY_DEVNO];
-    devno_t devno = (devno_t) key[KEY_DEVNO];
+    bool rv;
-    bool rv;
+    spinlock_lock(&irq->lock);
-    spinlock_lock(&irq->lock);
+    if (devno == -1) {
-    if (devno == -1) {
+        /* Invoked by irq_dispatch_and_lock() */
-        /* Invoked by irq_dispatch_and_lock() */
+        rv = (irq->claim() == IRQ_ACCEPT);
-        rv = (irq->claim() == IRQ_ACCEPT);
+    } else {
-    } else {
+        /* Invoked by irq_find_and_lock() */
-        /* Invoked by irq_find_and_lock() */
+        rv = (irq->devno == devno);
-        rv = (irq->devno == devno);
+    }
-    }
+    /* unlock only on non-match */
-    /* unlock only on non-match */
+    if (!rv)
-    if (!rv)
+        spinlock_unlock(&irq->lock);
-        spinlock_unlock(&irq->lock);
+    return rv;
-    return rv;
+}
-}
+/** @}
-/** @}
+ */
- */

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(root)//branches/rcu/kernel/generic/src/ddi/irq.c – Rev 2265 → 2292