HelenOSHelenOS-docHelenOS-historic

Català-Valencià – Catalan中文 – Chinese (Simplified)中文 – Chinese (Traditional)Česky – CzechDansk – DanishNederlands – DutchEnglish – EnglishSuomi – FinnishFrançais – FrenchDeutsch – Germanעברית – Hebrewहिंदी – HindiMagyar – HungarianBahasa Indonesia – IndonesianItaliano – Italian日本語 – Japanese한국어 – KoreanМакедонски – Macedonianमराठी – MarathiNorsk – NorwegianPolski – PolishPortuguês – PortuguesePortuguês – Portuguese (Brazil)Русский – RussianSlovenčina – SlovakSlovenščina – SlovenianEspañol – SpanishSvenska – SwedishTürkçe – TurkishУкраїнська – UkrainianOëzbekcha – Uzbek

Compare Revisions

• This comparison shows the changes necessary to convert path

  → /branches/rcu/kernel/generic/ @ 2264

  → /branches/rcu/kernel/generic/ @ 2265

  ↔ Reverse comparison

• Compare Path:	Rev

  With Path:	Rev

Ignore whitespace Rev 2264 → Rev 2265

/branches/rcu/kernel/generic/include/synch/rcu.h
36,7 → 36,7
#define KERN_RCU_H_
#include <arch/types.h>
#include <ddi/tasklet.h>
#include <proc/tasklet.h>
#include <arch/barrier.h>
#include <preemption.h>

/branches/rcu/kernel/generic/include/ddi/tasklet.h
File deleted

/branches/rcu/kernel/generic/include/ddi/irq.h
1,154 → 1,162
/*
* 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
*/
#ifndef KERN_IRQ_H_
#define KERN_IRQ_H_
typedef enum {
CMD_MEM_READ_1 = 0,
CMD_MEM_READ_2,
CMD_MEM_READ_4,
CMD_MEM_READ_8,
CMD_MEM_WRITE_1,
CMD_MEM_WRITE_2,
CMD_MEM_WRITE_4,
CMD_MEM_WRITE_8,
CMD_PORT_READ_1,
CMD_PORT_WRITE_1,
CMD_IA64_GETCHAR,
CMD_PPC32_GETCHAR,
CMD_LAST
} irq_cmd_type;
typedef struct {
irq_cmd_type cmd;
void *addr;
unsigned long long value;
int dstarg;
} irq_cmd_t;
typedef struct {
unsigned int cmdcount;
irq_cmd_t *cmds;
} irq_code_t;
#ifdef KERNEL
#include <arch/types.h>
#include <adt/list.h>
#include <synch/spinlock.h>
#include <proc/task.h>
typedef enum {
IRQ_DECLINE, /**< Decline to service. */
IRQ_ACCEPT /**< Accept to service. */
} irq_ownership_t;
typedef enum {
IRQ_TRIGGER_LEVEL = 1,
IRQ_TRIGGER_EDGE
} irq_trigger_t;
struct irq;
typedef void (* irq_handler_t)(struct irq *irq, void *arg, ...);
/** IPC notification config structure.
*
* Primarily, this structure is encapsulated in the irq_t structure.
* It is protected by irq_t::lock.
*/
typedef struct {
/** When false, notifications are not sent. */
bool notify;
/** Answerbox for notifications. */
answerbox_t *answerbox;
/** Method to be used for the notification. */
unative_t method;
/** Top-half pseudocode. */
irq_code_t *code;
/** Counter. */
count_t counter;
/**
* Link between IRQs that are notifying the same answerbox. The list is
* protected by the answerbox irq_lock.
*/
link_t link;
} ipc_notif_cfg_t;
/** Structure representing one device IRQ.
*
* If one device has multiple interrupts, there will be multiple irq_t
* instantions with the same devno.
*/
typedef struct irq {
/** Hash table link. */
link_t link;
/** Lock protecting everything in this structure
* except the link member. When both the IRQ
* hash table lock and this lock are to be acquired,
* this lock must not be taken first.
*/
SPINLOCK_DECLARE(lock);
/** Unique device number. -1 if not yet assigned. */
devno_t devno;
/** Actual IRQ number. -1 if not yet assigned. */
inr_t inr;
/** Trigger level of the IRQ.*/
irq_trigger_t trigger;
/** Claim ownership of the IRQ. */
irq_ownership_t (* claim)(void);
/** Handler for this IRQ and device. */
irq_handler_t handler;
/** Argument for the handler. */
void *arg;
/** Notification configuration structure. */
ipc_notif_cfg_t notif_cfg;
} irq_t;
extern void irq_init(count_t inrs, count_t chains);
extern void irq_initialize(irq_t *irq);
extern void irq_register(irq_t *irq);
extern irq_t *irq_dispatch_and_lock(inr_t inr);
extern irq_t *irq_find_and_lock(inr_t inr, devno_t devno);
#endif
#endif
/** @}
*/
/*
* 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
*/
#ifndef KERN_IRQ_H_
#define KERN_IRQ_H_
typedef enum {
CMD_MEM_READ_1 = 0,
CMD_MEM_READ_2,
CMD_MEM_READ_4,
CMD_MEM_READ_8,
CMD_MEM_WRITE_1,
CMD_MEM_WRITE_2,
CMD_MEM_WRITE_4,
CMD_MEM_WRITE_8,
CMD_PORT_READ_1,
CMD_PORT_WRITE_1,
CMD_IA64_GETCHAR,
CMD_PPC32_GETCHAR,
CMD_LAST
} irq_cmd_type;
typedef struct {
irq_cmd_type cmd;
void *addr;
unsigned long long value;
int dstarg;
} irq_cmd_t;
typedef struct {
unsigned int cmdcount;
irq_cmd_t *cmds;
} irq_code_t;
#ifdef KERNEL
#include <arch/types.h>
#include <adt/list.h>
#include <synch/spinlock.h>
#include <proc/task.h>
typedef enum {
IRQ_DECLINE, /**< Decline to service. */
IRQ_ACCEPT /**< Accept to service. */
} irq_ownership_t;
typedef enum {
IRQ_TRIGGER_LEVEL = 1,
IRQ_TRIGGER_EDGE
} irq_trigger_t;
struct irq;
typedef void (* irq_handler_t)(struct irq *irq, void *arg, ...);
/** IPC notification config structure.
*
* Primarily, this structure is encapsulated in the irq_t structure.
* It is protected by irq_t::lock.
*/
typedef struct {
/** When false, notifications are not sent. */
bool notify;
/** Answerbox for notifications. */
answerbox_t *answerbox;
/** Method to be used for the notification. */
unative_t method;
/** Top-half pseudocode. */
irq_code_t *code;
/** Counter. */
count_t counter;
/**
* Link between IRQs that are notifying the same answerbox. The list is
* protected by the answerbox irq_lock.
*/
link_t link;
} ipc_notif_cfg_t;
/** Structure representing one device IRQ.
*
* If one device has multiple interrupts, there will be multiple irq_t
* instantions with the same devno.
*/
typedef struct irq {
/** Hash table link. */
link_t link;
/** Lock protecting everything in this structure
* except the link member. When both the IRQ
* hash table lock and this lock are to be acquired,
* this lock must not be taken first.
*/
SPINLOCK_DECLARE(lock);
/** Send EOI before processing the interrupt.
* This is essential for timer interrupt which
* has to be acknowledged before doing preemption
* to make sure another timer interrupt will
* be eventually generated.
*/
bool preack;
/** Unique device number. -1 if not yet assigned. */
devno_t devno;
/** Actual IRQ number. -1 if not yet assigned. */
inr_t inr;
/** Trigger level of the IRQ. */
irq_trigger_t trigger;
/** Claim ownership of the IRQ. */
irq_ownership_t (* claim)(void);
/** Handler for this IRQ and device. */
irq_handler_t handler;
/** Argument for the handler. */
void *arg;
/** Notification configuration structure. */
ipc_notif_cfg_t notif_cfg;
} irq_t;
extern void irq_init(count_t inrs, count_t chains);
extern void irq_initialize(irq_t *irq);
extern void irq_register(irq_t *irq);
extern irq_t *irq_dispatch_and_lock(inr_t inr);
extern irq_t *irq_find_and_lock(inr_t inr, devno_t devno);
#endif
#endif
/** @}
*/

/branches/rcu/kernel/generic/src/synch/rcu.c
37,47 → 37,42
#include <arch.h>
#include <config.h>
#include <arch/types.h>
#include <ddi/tasklet.h>
#include <proc/tasklet.h>
#include <synch/spinlock.h>
#include <time/delay.h>
#include <panic.h>
#include <print.h>
typedef struct rcu_global
{
typedef struct {
uint32_t current_batch;
uint32_t completed_batch;
bool next_batch_waiting;
} rcu_global_t;
typedef struct rcu_callback_list
{
struct rcu_callback_list* next;
void (*func)(void*);
void* data;
bool* cpu_mask;
typedef struct rcu_callback_list {
struct rcu_callback_list* next;
void (*func)(void*);
void* data;
bool* cpu_mask;
} rcu_callback_list_t;
typedef struct rcu_percpu
{
typedef struct {
uint32_t current_batch_number;
uint32_t QS_passed;
bool QS_pending;
rcu_callback_list_t* next_batch, *current_batch, *done_batch;
rcu_callback_list_t* next_batch, *current_batch, *done_batch;
} rcu_percpu_t;
rcu_global_t _rcu_global;
rcu_percpu_t* _rcu_cpu_lists;
void rcu_init(void)
void rcu_init(void)
{
_rcu_cpu_lists = malloc(sizeof(rcu_percpu_t)*config.cpu_count,0);
_rcu_global.completed_batch = -1;
_rcu_global.current_batch = -1;
_rcu_global.next_batch_waiting = -1;
}
void rcu_synchronize(void)
97,7 → 92,7
{
int i;
rcu_callback_list_t *rd;
rd = malloc(sizeof(rcu_desc), 0);
rd = malloc(sizeof(rcu_callback_list_t), 0);
rd->func = func;
rd->data = data;
rd->next = NULL;
110,11 → 105,9
_rcu_global.next_batch_waiting = true;
rd->next = _rcu_cpu_lists[0].next_batch;
for (i=0;i<config.cpu_count;i++)
{
for (i=0;i<config.cpu_count;i++) {
_rcu_cpu_lists[i].next_batch = rd;
_rcu_cpu_lists[i].QS_pending = true;
}
//TODO:tasklet, after_thread_ran, polishing

/branches/rcu/kernel/generic/src/main/main.c
81,7 → 81,7
#include <console/klog.h>
#include <smp/smp.h>
#include <ddi/ddi.h>
#include <ddi/tasklet.h>
#include <proc/tasklet.h>
/** Global configuration structure. */
config_t config;
220,7 → 220,6
tlb_init();
ddi_init();
tasklet_init();
// tasklet_do();
arch_post_mm_init();
version_print();
242,7 → 241,6
calibrate_delay_loop();
clock_counter_init();
// tasklet_do();
timeout_init();
scheduler_init();
task_init();
259,9 → 257,7
init.tasks[i].size);
} else
printf("No init binaries found\n");
ipc_init();
//tasklet_do();
/*
* Create kernel task.
278,7 → 274,8
panic("can't create kinit thread\n");
thread_ready(t);
tasklet_run_tasklet_thread(k);
//tasklets disabled for debugging purposes
//tasklet_run_tasklet_thread(k);
/*
* This call to scheduler() will return to kinit,

/branches/rcu/kernel/generic/src/ddi/tasklet.c
File deleted

/branches/rcu/kernel/generic/src/ddi/irq.c
1,379 → 1,380
/*
* 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->inr = -1;
irq->devno = -1;
irq->trigger = (irq_trigger_t) 0;
irq->claim = NULL;
irq->handler = NULL;
irq->arg = NULL;
irq->notif_cfg.notify = false;
irq->notif_cfg.answerbox = NULL;
irq->notif_cfg.code = NULL;
irq->notif_cfg.method = 0;
irq->notif_cfg.counter = 0;
link_initialize(&irq->notif_cfg.link);
}
/** Register IRQ for device.
*
* The irq structure must be filled with information
* about the interrupt source and with the claim()
* function pointer and irq_handler() function pointer.
*
* @param irq IRQ structure belonging to a device.
*/
void irq_register(irq_t *irq)
{
ipl_t ipl;
unative_t key[] = {
(unative_t) irq->inr,
(unative_t) irq->devno
};
ipl = interrupts_disable();
spinlock_lock(&irq_hash_table_lock);
hash_table_insert(&irq_hash_table, key, &irq->link);
spinlock_unlock(&irq_hash_table_lock);
interrupts_restore(ipl);
}
/** Dispatch the IRQ.
*
* We assume this function is only called from interrupt
* context (i.e. that interrupts are disabled prior to
* this call).
*
* This function attempts to lookup a fitting IRQ
* structure. In case of success, return with interrupts
* disabled and holding the respective structure.
*
* @param inr Interrupt number (aka inr or irq).
*
* @return IRQ structure of the respective device or NULL.
*/
irq_t *irq_dispatch_and_lock(inr_t inr)
{
link_t *lnk;
unative_t key[] = {
(unative_t) inr,
(unative_t) -1 /* search will use claim() instead of devno */
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, key);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Find the IRQ structure corresponding to inr and devno.
*
* This functions attempts to lookup the IRQ structure
* corresponding to its arguments. On success, this
* function returns with interrups disabled, holding
* the lock of the respective IRQ structure.
*
* This function assumes interrupts are already disabled.
*
* @param inr INR being looked up.
* @param devno Devno being looked up.
*
* @return Locked IRQ structure on success or NULL on failure.
*/
irq_t *irq_find_and_lock(inr_t inr, devno_t devno)
{
link_t *lnk;
unative_t keys[] = {
(unative_t) inr,
(unative_t) devno
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, keys);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* can be collisions between different
* INRs.
*
* 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.
*
* @return Index into the hash table.
*/
index_t irq_ht_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr % irq_hash_table.entries;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the more complex architecture setup
* in which there are way too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match must be done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_ht_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = hash_table_get_instance(item, irq_t, link);
inr_t inr = (inr_t) key[KEY_INR];
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock(). */
rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
} else {
/* Invoked by irq_find_and_lock(). */
rv = ((irq->inr == inr) && (irq->devno == devno));
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* are no collisions between different
* INRs.
*
* @param key The first of the keys is inr and the second is devno or -1.
*
* @return Index into the hash table.
*/
index_t irq_lin_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the less complex architecture setup
* in which there are not too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match is not done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_lin_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = list_get_instance(item, irq_t, link);
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock() */
rv = (irq->claim() == IRQ_ACCEPT);
} else {
/* Invoked by irq_find_and_lock() */
rv = (irq->devno == devno);
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** @}
*/
/*
* 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->devno = -1;
irq->trigger = (irq_trigger_t) 0;
irq->claim = NULL;
irq->handler = NULL;
irq->arg = NULL;
irq->notif_cfg.notify = false;
irq->notif_cfg.answerbox = NULL;
irq->notif_cfg.code = NULL;
irq->notif_cfg.method = 0;
irq->notif_cfg.counter = 0;
link_initialize(&irq->notif_cfg.link);
}
/** Register IRQ for device.
*
* The irq structure must be filled with information
* about the interrupt source and with the claim()
* function pointer and irq_handler() function pointer.
*
* @param irq IRQ structure belonging to a device.
*/
void irq_register(irq_t *irq)
{
ipl_t ipl;
unative_t key[] = {
(unative_t) irq->inr,
(unative_t) irq->devno
};
ipl = interrupts_disable();
spinlock_lock(&irq_hash_table_lock);
hash_table_insert(&irq_hash_table, key, &irq->link);
spinlock_unlock(&irq_hash_table_lock);
interrupts_restore(ipl);
}
/** Dispatch the IRQ.
*
* We assume this function is only called from interrupt
* context (i.e. that interrupts are disabled prior to
* this call).
*
* This function attempts to lookup a fitting IRQ
* structure. In case of success, return with interrupts
* disabled and holding the respective structure.
*
* @param inr Interrupt number (aka inr or irq).
*
* @return IRQ structure of the respective device or NULL.
*/
irq_t *irq_dispatch_and_lock(inr_t inr)
{
link_t *lnk;
unative_t key[] = {
(unative_t) inr,
(unative_t) -1 /* search will use claim() instead of devno */
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, key);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Find the IRQ structure corresponding to inr and devno.
*
* This functions attempts to lookup the IRQ structure
* corresponding to its arguments. On success, this
* function returns with interrups disabled, holding
* the lock of the respective IRQ structure.
*
* This function assumes interrupts are already disabled.
*
* @param inr INR being looked up.
* @param devno Devno being looked up.
*
* @return Locked IRQ structure on success or NULL on failure.
*/
irq_t *irq_find_and_lock(inr_t inr, devno_t devno)
{
link_t *lnk;
unative_t keys[] = {
(unative_t) inr,
(unative_t) devno
};
spinlock_lock(&irq_hash_table_lock);
lnk = hash_table_find(&irq_hash_table, keys);
if (lnk) {
irq_t *irq;
irq = hash_table_get_instance(lnk, irq_t, link);
spinlock_unlock(&irq_hash_table_lock);
return irq;
}
spinlock_unlock(&irq_hash_table_lock);
return NULL;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* can be collisions between different
* INRs.
*
* 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.
*
* @return Index into the hash table.
*/
index_t irq_ht_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr % irq_hash_table.entries;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the more complex architecture setup
* in which there are way too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match must be done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_ht_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = hash_table_get_instance(item, irq_t, link);
inr_t inr = (inr_t) key[KEY_INR];
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock(). */
rv = ((irq->inr == inr) && (irq->claim() == IRQ_ACCEPT));
} else {
/* Invoked by irq_find_and_lock(). */
rv = ((irq->inr == inr) && (irq->devno == devno));
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** Compute hash index for the key.
*
* This function computes hash index into
* the IRQ hash table for which there
* are no collisions between different
* INRs.
*
* @param key The first of the keys is inr and the second is devno or -1.
*
* @return Index into the hash table.
*/
index_t irq_lin_hash(unative_t key[])
{
inr_t inr = (inr_t) key[KEY_INR];
return inr;
}
/** Compare hash table element with a key.
*
* There are two things to note about this function.
* First, it is used for the less complex architecture setup
* in which there are not too many interrupt numbers (i.e. inr's)
* to arrange the hash table so that collisions occur only
* among same inrs of different devnos. So the explicit check
* for inr match is not done.
* Second, if devno is -1, the second key (i.e. devno) is not
* used for the match and the result of the claim() function
* is used instead.
*
* This function assumes interrupts are already disabled.
*
* @param key Keys (i.e. inr and devno).
* @param keys This is 2.
* @param item The item to compare the key with.
*
* @return True on match or false otherwise.
*/
bool irq_lin_compare(unative_t key[], count_t keys, link_t *item)
{
irq_t *irq = list_get_instance(item, irq_t, link);
devno_t devno = (devno_t) key[KEY_DEVNO];
bool rv;
spinlock_lock(&irq->lock);
if (devno == -1) {
/* Invoked by irq_dispatch_and_lock() */
rv = (irq->claim() == IRQ_ACCEPT);
} else {
/* Invoked by irq_find_and_lock() */
rv = (irq->devno == devno);
}
/* unlock only on non-match */
if (!rv)
spinlock_unlock(&irq->lock);
return rv;
}
/** @}
*/