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Subject[PATCH] 2.5.25: s390 drivers.
Date
Hi Linus,
improvements for the s/390 drivers:
* use list_move_tail instead of list_del/list_add_tail in dasd driver
* dynamically allocate dasd_info in dasd_ioctl_information since its big
* replace immediate bottom half with tasklet in 3215, 3270, tape, ctc and iucv driver

blue skies,
Martin.

diff -urN linux-2.5.25/drivers/s390/block/dasd.c linux-2.5.25-s390/drivers/s390/block/dasd.c
--- linux-2.5.25/drivers/s390/block/dasd.c Sat Jul 6 01:42:23 2002
+++ linux-2.5.25-s390/drivers/s390/block/dasd.c Mon Jul 8 15:08:28 2002
@@ -1547,11 +1547,9 @@
goto restart;
}

- /* Dechain request from device request queue ... */
+ /* Rechain request on device device request queue */
cqr->endclk = get_clock();
- list_del(&cqr->list);
- /* ... and add it to list of final requests. */
- list_add_tail(&cqr->list, final_queue);
+ list_move_tail(&cqr->list, final_queue);
}
}

@@ -1715,11 +1713,9 @@
__dasd_process_erp(device, cqr);
continue;
}
- /* Dechain request from device request queue ... */
+ /* Rechain request on device request queue */
cqr->endclk = get_clock();
- list_del(&cqr->list);
- /* ... and add it to list of flushed requests. */
- list_add_tail(&cqr->list, &flush_queue);
+ list_move_tail(&cqr->list, &flush_queue);
}
spin_unlock_irq(get_irq_lock(device->devinfo.irq));
/* Now call the callback function of flushed requests */
diff -urN linux-2.5.25/drivers/s390/block/dasd_ioctl.c linux-2.5.25-s390/drivers/s390/block/dasd_ioctl.c
--- linux-2.5.25/drivers/s390/block/dasd_ioctl.c Sat Jul 6 01:42:02 2002
+++ linux-2.5.25-s390/drivers/s390/block/dasd_ioctl.c Mon Jul 8 15:08:28 2002
@@ -340,7 +340,7 @@
{
dasd_devmap_t *devmap;
dasd_device_t *device;
- dasd_information2_t dasd_info;
+ dasd_information2_t *dasd_info;
unsigned long flags;
int rc;

@@ -354,20 +354,24 @@
return -EINVAL;
}

- rc = device->discipline->fill_info(device, &dasd_info);
+ dasd_info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
+ if (dasd_info == NULL)
+ return -ENOMEM;
+ rc = device->discipline->fill_info(device, dasd_info);
if (rc) {
dasd_put_device(devmap);
+ kfree(dasd_info);
return rc;
}

- dasd_info.devno = device->devinfo.devno;
- dasd_info.schid = device->devinfo.irq;
- dasd_info.cu_type = device->devinfo.sid_data.cu_type;
- dasd_info.cu_model = device->devinfo.sid_data.cu_model;
- dasd_info.dev_type = device->devinfo.sid_data.dev_type;
- dasd_info.dev_model = device->devinfo.sid_data.dev_model;
- dasd_info.open_count = atomic_read(&device->open_count);
- dasd_info.status = device->state;
+ dasd_info->devno = device->devinfo.devno;
+ dasd_info->schid = device->devinfo.irq;
+ dasd_info->cu_type = device->devinfo.sid_data.cu_type;
+ dasd_info->cu_model = device->devinfo.sid_data.cu_model;
+ dasd_info->dev_type = device->devinfo.sid_data.dev_type;
+ dasd_info->dev_model = device->devinfo.sid_data.dev_model;
+ dasd_info->open_count = atomic_read(&device->open_count);
+ dasd_info->status = device->state;

/*
* check if device is really formatted
@@ -375,16 +379,16 @@
*/
if ((device->state < DASD_STATE_READY) ||
(dasd_check_blocksize(device->bp_block)))
- dasd_info.format = DASD_FORMAT_NONE;
+ dasd_info->format = DASD_FORMAT_NONE;

- dasd_info.features = devmap->features;
+ dasd_info->features = devmap->features;

if (device->discipline)
- memcpy(dasd_info.type, device->discipline->name, 4);
+ memcpy(dasd_info->type, device->discipline->name, 4);
else
- memcpy(dasd_info.type, "none", 4);
- dasd_info.req_queue_len = 0;
- dasd_info.chanq_len = 0;
+ memcpy(dasd_info->type, "none", 4);
+ dasd_info->req_queue_len = 0;
+ dasd_info->chanq_len = 0;
if (device->request_queue->request_fn) {
struct list_head *l;
#ifdef DASD_EXTENDED_PROFILING
@@ -392,24 +396,25 @@
struct list_head *l;
spin_lock_irqsave(&device->lock, flags);
list_for_each(l, &device->request_queue->queue_head)
- dasd_info.req_queue_len++;
+ dasd_info->req_queue_len++;
spin_unlock_irqrestore(&device->lock, flags);
}
#endif /* DASD_EXTENDED_PROFILING */
spin_lock_irqsave(get_irq_lock(device->devinfo.irq), flags);
list_for_each(l, &device->ccw_queue)
- dasd_info.chanq_len++;
+ dasd_info->chanq_len++;
spin_unlock_irqrestore(get_irq_lock(device->devinfo.irq),
flags);
}

rc = 0;
- if (copy_to_user((long *) args, (long *) &dasd_info,
+ if (copy_to_user((long *) args, (long *) dasd_info,
((no == (unsigned int) BIODASDINFO2) ?
sizeof (dasd_information2_t) :
sizeof (dasd_information_t))))
rc = -EFAULT;
dasd_put_device(devmap);
+ kfree(dasd_info);
return rc;
}

diff -urN linux-2.5.25/drivers/s390/char/con3215.c linux-2.5.25-s390/drivers/s390/char/con3215.c
--- linux-2.5.25/drivers/s390/char/con3215.c Sat Jul 6 01:42:05 2002
+++ linux-2.5.25-s390/drivers/s390/char/con3215.c Mon Jul 8 15:08:28 2002
@@ -89,7 +89,7 @@
int written; /* number of bytes in write requests */
devstat_t devstat; /* device status structure for do_IO */
struct tty_struct *tty; /* pointer to tty structure if present */
- struct tq_struct tqueue; /* task queue to bottom half */
+ struct tasklet_struct tasklet;
raw3215_req *queued_read; /* pointer to queued read requests */
raw3215_req *queued_write; /* pointer to queued write requests */
wait_queue_head_t empty_wait; /* wait queue for flushing */
@@ -341,7 +341,7 @@
* The bottom half handler routine for 3215 devices. It tries to start
* the next IO and wakes up processes waiting on the tty.
*/
-static void raw3215_softint(void *data)
+static void raw3215_tasklet(void *data)
{
raw3215_info *raw;
struct tty_struct *tty;
@@ -377,12 +377,7 @@
if (raw->flags & RAW3215_BH_PENDING)
return; /* already pending */
raw->flags |= RAW3215_BH_PENDING;
- INIT_LIST_HEAD(&raw->tqueue.list);
- raw->tqueue.sync = 0;
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
- queue_task(&raw->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_hi_schedule(&raw->tasklet);
}

/*
@@ -867,8 +862,9 @@
kfree(raw);
return -ENOMEM;
}
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
+ tasklet_init(&raw->tasklet,
+ (void (*)(unsigned long)) raw3215_tasklet,
+ (unsigned long) raw);
init_waitqueue_head(&raw->empty_wait);
raw3215[line] = raw;
}
@@ -1097,8 +1093,9 @@
/* Find the first console */
raw->irq = raw3215_find_dev(0);
raw->flags |= RAW3215_FIXED;
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
+ tasklet_init(&raw->tasklet,
+ (void (*)(unsigned long)) raw3215_tasklet,
+ (unsigned long) raw);
init_waitqueue_head(&raw->empty_wait);

/* Request the console irq */
diff -urN linux-2.5.25/drivers/s390/char/tape.h linux-2.5.25-s390/drivers/s390/char/tape.h
--- linux-2.5.25/drivers/s390/char/tape.h Sat Jul 6 01:42:32 2002
+++ linux-2.5.25-s390/drivers/s390/char/tape.h Mon Jul 8 15:08:28 2002
@@ -197,8 +197,8 @@
struct request* current_request;
int blk_retries;
long position;
- atomic_t bh_scheduled;
- struct tq_struct bh_tq;
+ atomic_t tasklet_scheduled;
+ struct tasklet_struct tasklet;
#ifdef CONFIG_DEVFS_FS
devfs_handle_t devfs_block_dir; /* tape/DEVNO/block dir */
devfs_handle_t devfs_disc; /* tape/DEVNO/block/disc */
diff -urN linux-2.5.25/drivers/s390/char/tapeblock.c linux-2.5.25-s390/drivers/s390/char/tapeblock.c
--- linux-2.5.25/drivers/s390/char/tapeblock.c Sat Jul 6 01:42:21 2002
+++ linux-2.5.25-s390/drivers/s390/char/tapeblock.c Mon Jul 8 15:08:28 2002
@@ -79,6 +79,8 @@
}
#endif

+static void run_tapeblock_exec_IO (tape_dev_t* td);
+
void
tapeblock_setup(tape_dev_t* td) {
blk_size[tapeblock_major][td->first_minor]=0; // this will be detected
@@ -88,6 +90,9 @@
tapeblock_mkdevfstree(td);
#endif
set_device_ro (MKDEV(tapeblock_major, td->first_minor), 1);
+ tasklet_init(&td->blk_data.tasklet,
+ (void (*)(unsigned long)) run_tapeblock_exec_IO,
+ (unsinged long) td);
}

int
@@ -408,15 +413,7 @@
if (atomic_compare_and_swap(0,1,&td->blk_data.bh_scheduled)) {
return;
}
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,3,98))
- INIT_LIST_HEAD(&td->blk_data.bh_tq.list);
-#endif
- td->blk_data.bh_tq.sync = 0;
- td->blk_data.bh_tq.routine = (void *) (void *) run_tapeblock_exec_IO;
- td->blk_data.bh_tq.data = td;
-
- queue_task (&td->blk_data.bh_tq, &tq_immediate);
- mark_bh (IMMEDIATE_BH);
+ tasklet_hi_schedule(&td->blk_data.tasklet);
return;
}

diff -urN linux-2.5.25/drivers/s390/char/tuball.c linux-2.5.25-s390/drivers/s390/char/tuball.c
--- linux-2.5.25/drivers/s390/char/tuball.c Sat Jul 6 01:42:19 2002
+++ linux-2.5.25-s390/drivers/s390/char/tuball.c Mon Jul 8 15:08:28 2002
@@ -444,6 +444,13 @@
tubp->tty_bcb.bc_rd = 0;
(*tubminors)[minor] = tubp;

+ tasklet_init(&tubp->fs_tasklet,
+ (void (*)(unsigned long)) fs3270_bh,
+ (unsigned long) tubp);
+ tasklet_init(&tubp->tty_tasklet,
+ (void (*)(unsigned long)) tty3270_bh,
+ (unsigned long) tubp);
+
#ifdef CONFIG_TN3270_CONSOLE
if (CONSOLE_IS_3270) {
if (tub3270_con_tubp == NULL &&
diff -urN linux-2.5.25/drivers/s390/char/tubfs.c linux-2.5.25-s390/drivers/s390/char/tubfs.c
--- linux-2.5.25/drivers/s390/char/tubfs.c Sat Jul 6 01:42:31 2002
+++ linux-2.5.25-s390/drivers/s390/char/tubfs.c Mon Jul 8 15:08:28 2002
@@ -238,7 +238,7 @@
/*
* fs3270_bh(tubp) -- Perform back-half processing
*/
-static void
+void
fs3270_bh(void *data)
{
long flags;
@@ -275,10 +275,7 @@
if (tubp->flags & TUB_BHPENDING)
return;
tubp->flags |= TUB_BHPENDING;
- tubp->tqueue.routine = fs3270_bh;
- tubp->tqueue.data = tubp;
- queue_task(&tubp->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_hi_schedule(&tubp->fs_tasklet);
}

/*
diff -urN linux-2.5.25/drivers/s390/char/tubio.h linux-2.5.25-s390/drivers/s390/char/tubio.h
--- linux-2.5.25/drivers/s390/char/tubio.h Sat Jul 6 01:42:00 2002
+++ linux-2.5.25-s390/drivers/s390/char/tubio.h Mon Jul 8 15:08:28 2002
@@ -234,7 +234,8 @@
enum tubstat stat;
enum tubcmd cmd;
int flags; /* See below for values */
- struct tq_struct tqueue;
+ struct tasklet_struct fs_tasklet;
+ struct tasklet_struct tty_tasklet;

/* Stuff for fs-driver support */
pid_t fs_pid; /* Pid if TBM_FS */
@@ -328,6 +329,8 @@
extern int tty3270_proc_misc;
extern enum tubwhat tty3270_proc_what;
extern struct tty_driver tty3270_driver;
+extern void fs3270_bh(void *data);
+extern void tty3270_bh(void *data);
#ifdef CONFIG_DEVFS_FS
extern devfs_handle_t fs3270_devfs_dir;
extern void fs3270_devfs_register(tub_t *);
diff -urN linux-2.5.25/drivers/s390/char/tubtty.c linux-2.5.25-s390/drivers/s390/char/tubtty.c
--- linux-2.5.25/drivers/s390/char/tubtty.c Sat Jul 6 01:42:33 2002
+++ linux-2.5.25-s390/drivers/s390/char/tubtty.c Mon Jul 8 15:08:48 2002
@@ -35,8 +35,6 @@
unsigned long, void *);

/* tty3270 utility functions */
-static void tty3270_bh(void *);
- void tty3270_sched_bh(tub_t *);
static int tty3270_wait(tub_t *, long *);
void tty3270_int(tub_t *, devstat_t *);
static int tty3270_try_logging(tub_t *);
@@ -600,7 +598,7 @@
/*
* tty3270_bh(tubp) -- Perform back-half processing
*/
-static void
+void
tty3270_bh(void *data)
{
tub_t *tubp;
@@ -663,10 +661,7 @@
if (tubp->flags & TUB_BHPENDING)
return;
tubp->flags |= TUB_BHPENDING;
- tubp->tqueue.routine = tty3270_bh;
- tubp->tqueue.data = tubp;
- queue_task(&tubp->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_hi_schedule(&tubp->tty_tasklet);
}

/*
diff -urN linux-2.5.25/drivers/s390/net/ctctty.c linux-2.5.25-s390/drivers/s390/net/ctctty.c
--- linux-2.5.25/drivers/s390/net/ctctty.c Sat Jul 6 01:42:28 2002
+++ linux-2.5.25-s390/drivers/s390/net/ctctty.c Mon Jul 8 15:08:28 2002
@@ -86,7 +86,7 @@
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
struct semaphore write_sem;
- struct tq_struct tq;
+ struct tasklet_struct tasklet;
struct timer_list stoptimer;
} ctc_tty_info;

@@ -272,8 +272,7 @@
*/
skb_queue_tail(&info->rx_queue, skb);
/* Schedule dequeuing */
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}

static int
@@ -390,8 +389,7 @@
skb_reserve(skb, skb_res);
*(skb_put(skb, 1)) = c;
skb_queue_head(&info->tx_queue, skb);
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}

static void
@@ -400,8 +398,7 @@
if (ctc_tty_shuttingdown)
return;
info->flags |= CTC_ASYNC_TX_LINESTAT;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}

static void
@@ -562,8 +559,7 @@
}
if (skb_queue_len(&info->tx_queue)) {
info->lsr &= ~UART_LSR_TEMT;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}
if (from_user)
up(&info->write_sem);
@@ -628,8 +624,7 @@
return;
if (tty->stopped || tty->hw_stopped || (!skb_queue_len(&info->tx_queue)))
return;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}

/*
@@ -1170,8 +1165,9 @@
* the lower levels.
*/
static void
-ctc_tty_task(ctc_tty_info *info)
+ctc_tty_task(unsigned long arg)
{
+ ctc_tty_info *info = (void *)arg;
unsigned long saveflags;
int again;

@@ -1182,8 +1178,7 @@
info->lsr |= UART_LSR_TEMT;
again |= ctc_tty_readmodem(info);
if (again) {
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
}
}
spin_unlock_irqrestore(&ctc_tty_lock, saveflags);
@@ -1243,14 +1238,8 @@
for (i = 0; i < CTC_TTY_MAX_DEVICES; i++) {
info = &driver->info[i];
init_MUTEX(&info->write_sem);
-#if LINUX_VERSION_CODE >= 0x020400
- INIT_LIST_HEAD(&info->tq.list);
-#else
- info->tq.next = NULL;
-#endif
- info->tq.sync = 0;
- info->tq.routine = (void *)(void *)ctc_tty_task;
- info->tq.data = info;
+ tasklet_init(&info->tasklet, ctc_tty_task,
+ (unsigned long) info);
info->magic = CTC_ASYNC_MAGIC;
info->line = i;
info->tty = 0;
@@ -1331,10 +1320,6 @@
kfree(driver);
driver = NULL;
} else {
- int i;
-
- for (i = 0; i < CTC_TTY_MAX_DEVICES; i++)
- driver->info[i].tq.routine = NULL;
tty_unregister_driver(&driver->ctc_tty_device);
}
spin_unlock_irqrestore(&ctc_tty_lock, saveflags);
diff -urN linux-2.5.25/drivers/s390/net/iucv.c linux-2.5.25-s390/drivers/s390/net/iucv.c
--- linux-2.5.25/drivers/s390/net/iucv.c Sat Jul 6 01:42:04 2002
+++ linux-2.5.25-s390/drivers/s390/net/iucv.c Mon Jul 8 15:08:28 2002
@@ -41,9 +41,9 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
-#include <linux/tqueue.h>
#include <linux/interrupt.h>
#include <linux/list.h>
+#include <linux/errno.h>
#include <asm/atomic.h>
#include "iucv.h"
#include <asm/io.h>
@@ -99,16 +99,14 @@
static struct list_head iucv_irq_queue;
static spinlock_t iucv_irq_queue_lock = SPIN_LOCK_UNLOCKED;

-static struct tq_struct iucv_tq;
-
-static atomic_t iucv_bh_scheduled = ATOMIC_INIT (0);
-
/*
*Internal function prototypes
*/
-static void iucv_bh_handler(void);
+static void iucv_tasklet_handler(unsigned long);
static void iucv_irq_handler(struct pt_regs *, __u16);

+static DECLARE_TASKLET(iucv_tasklet,iucv_tasklet_handler,0);
+
/************ FUNCTION ID'S ****************************/

#define ACCEPT 10
@@ -302,7 +300,7 @@
if (debuglevel < 3)
return;

- printk(KERN_DEBUG __FUNCTION__ ": %s\n", title);
+ printk(KERN_DEBUG "%s\n", title);
printk(" ");
for (i = 0; i < len; i++) {
if (!(i % 16) && i != 0)
@@ -318,7 +316,7 @@
#define iucv_debug(lvl, fmt, args...) \
do { \
if (debuglevel >= lvl) \
- printk(KERN_DEBUG __FUNCTION__ ": " fmt "\n" , ## args); \
+ printk(KERN_DEBUG "%s: " fmt "\n", __FUNCTION__ , ## args); \
} while (0)

#else
@@ -385,11 +383,6 @@
}
memset(iucv_param_pool, 0, sizeof(iucv_param) * PARAM_POOL_SIZE);

- /* Initialize task queue */
- INIT_LIST_HEAD(&iucv_tq.list);
- iucv_tq.sync = 0;
- iucv_tq.routine = (void *)iucv_bh_handler;
-
/* Initialize irq queue */
INIT_LIST_HEAD(&iucv_irq_queue);

@@ -2177,7 +2170,7 @@
* @code: irq code
*
* Handles external interrupts coming in from CP.
- * Places the interrupt buffer on a queue and schedules iucv_bh_handler().
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
*/
static void
iucv_irq_handler(struct pt_regs *regs, __u16 code)
@@ -2201,10 +2194,7 @@
list_add_tail(&irqdata->queue, &iucv_irq_queue);
spin_unlock(&iucv_irq_queue_lock);

- if (atomic_compare_and_swap (0, 1, &iucv_bh_scheduled) == 0) {
- queue_task (&iucv_tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- }
+ tasklet_schedule(&iucv_tasklet);

irq_exit(cpu, 0x4000);
return;
@@ -2215,7 +2205,7 @@
* @int_buf: Pointer to copy of external interrupt buffer
*
* The workhorse for handling interrupts queued by iucv_irq_handler().
- * This function is called from the bottom half iucv_bh_handler().
+ * This function is called from the bottom half iucv_tasklet_handler().
*/
static void
iucv_do_int(iucv_GeneralInterrupt * int_buf)
@@ -2385,19 +2375,17 @@
}

/**
- * iucv_bh_handler:
+ * iucv_tasklet_handler:
*
* This function loops over the queue of irq buffers and runs iucv_do_int()
* on every queue element.
*/
static void
-iucv_bh_handler(void)
+iucv_tasklet_handler(unsigned long ignored)
{
struct list_head head;
struct list_head *next;
ulong flags;
-
- atomic_set(&iucv_bh_scheduled, 0);

spin_lock_irqsave(&iucv_irq_queue_lock, flags);
list_add(&head, &iucv_irq_queue);
-
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