Release 4.11 drivers/scsi/arm/queue.c
/*
* linux/drivers/acorn/scsi/queue.c: queue handling primitives
*
* Copyright (C) 1997-2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Changelog:
* 15-Sep-1997 RMK Created.
* 11-Oct-1997 RMK Corrected problem with queue_remove_exclude
* not updating internal linked list properly
* (was causing commands to go missing).
* 30-Aug-2000 RMK Use Linux list handling and spinlocks
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/init.h>
#include "../scsi.h"
#define DEBUG
typedef struct queue_entry {
struct list_head list;
struct scsi_cmnd *SCpnt;
#ifdef DEBUG
unsigned long magic;
#endif
}
QE_t;
#ifdef DEBUG
#define QUEUE_MAGIC_FREE 0xf7e1c9a3
#define QUEUE_MAGIC_USED 0xf7e1cc33
#define SET_MAGIC(q,m) ((q)->magic = (m))
#define BAD_MAGIC(q,m) ((q)->magic != (m))
#else
#define SET_MAGIC(q,m) do { } while (0)
#define BAD_MAGIC(q,m) (0)
#endif
#include "queue.h"
#define NR_QE 32
/*
* Function: void queue_initialise (Queue_t *queue)
* Purpose : initialise a queue
* Params : queue - queue to initialise
*/
int queue_initialise (Queue_t *queue)
{
unsigned int nqueues = NR_QE;
QE_t *q;
spin_lock_init(&queue->queue_lock);
INIT_LIST_HEAD(&queue->head);
INIT_LIST_HEAD(&queue->free);
/*
* If life was easier, then SCpnt would have a
* host-available list head, and we wouldn't
* need to keep free lists or allocate this
* memory.
*/
queue->alloc = q = kmalloc(sizeof(QE_t) * nqueues, GFP_KERNEL);
if (q) {
for (; nqueues; q++, nqueues--) {
SET_MAGIC(q, QUEUE_MAGIC_FREE);
q->SCpnt = NULL;
list_add(&q->list, &queue->free);
}
}
return queue->alloc != NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 114 | 100.00% | 3 | 100.00% |
| Total | 114 | 100.00% | 3 | 100.00% |
/*
* Function: void queue_free (Queue_t *queue)
* Purpose : free a queue
* Params : queue - queue to free
*/
void queue_free (Queue_t *queue)
{
if (!list_empty(&queue->head))
printk(KERN_WARNING "freeing non-empty queue %p\n", queue);
kfree(queue->alloc);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 35 | 100.00% | 2 | 100.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
/*
* Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
* Purpose : Add a new command onto a queue, adding REQUEST_SENSE to head.
* Params : queue - destination queue
* SCpnt - command to add
* head - add command to head of queue
* Returns : 0 on error, !0 on success
*/
int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
{
unsigned long flags;
struct list_head *l;
QE_t *q;
int ret = 0;
spin_lock_irqsave(&queue->queue_lock, flags);
if (list_empty(&queue->free))
goto empty;
l = queue->free.next;
list_del(l);
q = list_entry(l, QE_t, list);
BUG_ON(BAD_MAGIC(q, QUEUE_MAGIC_FREE));
SET_MAGIC(q, QUEUE_MAGIC_USED);
q->SCpnt = SCpnt;
if (head)
list_add(l, &queue->head);
else
list_add_tail(l, &queue->head);
ret = 1;
empty:
spin_unlock_irqrestore(&queue->queue_lock, flags);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 144 | 96.64% | 2 | 50.00% |
| Eric Sesterhenn / Snakebyte | 3 | 2.01% | 1 | 25.00% |
| Henrik Kretzschmar | 2 | 1.34% | 1 | 25.00% |
| Total | 149 | 100.00% | 4 | 100.00% |
static struct scsi_cmnd *__queue_remove(Queue_t *queue, struct list_head *ent)
{
QE_t *q;
/*
* Move the entry from the "used" list onto the "free" list
*/
list_del(ent);
q = list_entry(ent, QE_t, list);
BUG_ON(BAD_MAGIC(q, QUEUE_MAGIC_USED));
SET_MAGIC(q, QUEUE_MAGIC_FREE);
list_add(ent, &queue->free);
return q->SCpnt;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 65 | 92.86% | 2 | 50.00% |
| Eric Sesterhenn / Snakebyte | 3 | 4.29% | 1 | 25.00% |
| Henrik Kretzschmar | 2 | 2.86% | 1 | 25.00% |
| Total | 70 | 100.00% | 4 | 100.00% |
/*
* Function: struct scsi_cmnd *queue_remove_exclude (queue, exclude)
* Purpose : remove a SCSI command from a queue
* Params : queue - queue to remove command from
* exclude - bit array of target&lun which is busy
* Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
*/
struct scsi_cmnd *queue_remove_exclude(Queue_t *queue, unsigned long *exclude)
{
unsigned long flags;
struct list_head *l;
struct scsi_cmnd *SCpnt = NULL;
spin_lock_irqsave(&queue->queue_lock, flags);
list_for_each(l, &queue->head) {
QE_t *q = list_entry(l, QE_t, list);
if (!test_bit(q->SCpnt->device->id * 8 +
(u8)(q->SCpnt->device->lun & 0x7), exclude)) {
SCpnt = __queue_remove(queue, l);
break;
}
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
return SCpnt;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 103 | 85.12% | 2 | 33.33% |
| Russell King | 7 | 5.79% | 2 | 33.33% |
| Hannes Reinecke | 7 | 5.79% | 1 | 16.67% |
| Henrik Kretzschmar | 4 | 3.31% | 1 | 16.67% |
| Total | 121 | 100.00% | 6 | 100.00% |
/*
* Function: struct scsi_cmnd *queue_remove (queue)
* Purpose : removes first SCSI command from a queue
* Params : queue - queue to remove command from
* Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
*/
struct scsi_cmnd *queue_remove(Queue_t *queue)
{
unsigned long flags;
struct scsi_cmnd *SCpnt = NULL;
spin_lock_irqsave(&queue->queue_lock, flags);
if (!list_empty(&queue->head))
SCpnt = __queue_remove(queue, queue->head.next);
spin_unlock_irqrestore(&queue->queue_lock, flags);
return SCpnt;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 65 | 94.20% | 2 | 66.67% |
| Henrik Kretzschmar | 4 | 5.80% | 1 | 33.33% |
| Total | 69 | 100.00% | 3 | 100.00% |
/*
* Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
* Purpose : remove a SCSI command from the queue for a specified target/lun/tag
* Params : queue - queue to remove command from
* target - target that we want
* lun - lun on device
* tag - tag on device
* Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
*/
struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target, int lun,
int tag)
{
unsigned long flags;
struct list_head *l;
struct scsi_cmnd *SCpnt = NULL;
spin_lock_irqsave(&queue->queue_lock, flags);
list_for_each(l, &queue->head) {
QE_t *q = list_entry(l, QE_t, list);
if (q->SCpnt->device->id == target && q->SCpnt->device->lun == lun &&
q->SCpnt->tag == tag) {
SCpnt = __queue_remove(queue, l);
break;
}
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
return SCpnt;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 113 | 92.62% | 2 | 50.00% |
| Russell King | 5 | 4.10% | 1 | 25.00% |
| Henrik Kretzschmar | 4 | 3.28% | 1 | 25.00% |
| Total | 122 | 100.00% | 4 | 100.00% |
/*
* Function: queue_remove_all_target(queue, target)
* Purpose : remove all SCSI commands from the queue for a specified target
* Params : queue - queue to remove command from
* target - target device id
* Returns : nothing
*/
void queue_remove_all_target(Queue_t *queue, int target)
{
unsigned long flags;
struct list_head *l;
spin_lock_irqsave(&queue->queue_lock, flags);
list_for_each(l, &queue->head) {
QE_t *q = list_entry(l, QE_t, list);
if (q->SCpnt->device->id == target)
__queue_remove(queue, l);
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 81 | 100.00% | 2 | 100.00% |
| Total | 81 | 100.00% | 2 | 100.00% |
/*
* Function: int queue_probetgtlun (queue, target, lun)
* Purpose : check to see if we have a command in the queue for the specified
* target/lun.
* Params : queue - queue to look in
* target - target we want to probe
* lun - lun on target
* Returns : 0 if not found, != 0 if found
*/
int queue_probetgtlun (Queue_t *queue, int target, int lun)
{
unsigned long flags;
struct list_head *l;
int found = 0;
spin_lock_irqsave(&queue->queue_lock, flags);
list_for_each(l, &queue->head) {
QE_t *q = list_entry(l, QE_t, list);
if (q->SCpnt->device->id == target && q->SCpnt->device->lun == lun) {
found = 1;
break;
}
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
return found;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 97 | 95.10% | 2 | 66.67% |
| Russell King | 5 | 4.90% | 1 | 33.33% |
| Total | 102 | 100.00% | 3 | 100.00% |
/*
* Function: int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
* Purpose : remove a specific command from the queues
* Params : queue - queue to look in
* SCpnt - command to find
* Returns : 0 if not found
*/
int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
{
unsigned long flags;
struct list_head *l;
int found = 0;
spin_lock_irqsave(&queue->queue_lock, flags);
list_for_each(l, &queue->head) {
QE_t *q = list_entry(l, QE_t, list);
if (q->SCpnt == SCpnt) {
__queue_remove(queue, l);
found = 1;
break;
}
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
return found;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 92 | 97.87% | 2 | 66.67% |
| Henrik Kretzschmar | 2 | 2.13% | 1 | 33.33% |
| Total | 94 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(queue_initialise);
EXPORT_SYMBOL(queue_free);
EXPORT_SYMBOL(__queue_add);
EXPORT_SYMBOL(queue_remove);
EXPORT_SYMBOL(queue_remove_exclude);
EXPORT_SYMBOL(queue_remove_tgtluntag);
EXPORT_SYMBOL(queue_remove_cmd);
EXPORT_SYMBOL(queue_remove_all_target);
EXPORT_SYMBOL(queue_probetgtlun);
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("SCSI command queueing");
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 977 | 85.70% | 3 | 21.43% |
| Russell King | 105 | 9.21% | 4 | 28.57% |
| Henrik Kretzschmar | 25 | 2.19% | 1 | 7.14% |
| Linus Torvalds | 19 | 1.67% | 3 | 21.43% |
| Hannes Reinecke | 7 | 0.61% | 1 | 7.14% |
| Eric Sesterhenn / Snakebyte | 6 | 0.53% | 1 | 7.14% |
| Adrian Bunk | 1 | 0.09% | 1 | 7.14% |
| Total | 1140 | 100.00% | 14 | 100.00% |
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