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[S390] rework of channel measurement facility.

Browse source 
Fixes for several channel measurement facility bugs:
* Blocks copied from the hardware might not be consistent. Solve this
  by moving the copying into idle state and repeating the copying.
* avg_sample_interval changed with every read, even though no new block
  was available. Solve this by storing a timestamp when the last new
  block was received.
* Several locking issues.
* Measurements were not reenabled after a disconnected device became
  available again.
* Remove #defines for ioctls that were never implemented.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2006-06-29 15:08:41 +02:00 committed by Martin Schwidefsky
parent 5b5dd21a8e
commit 94bb063312
4 changed files with 469 additions and 182 deletions
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625
drivers/s390/cio/cmf.c
View file

@ -3,9 +3,10 @@
*
* Linux on zSeries Channel Measurement Facility support
*
* Copyright 2000,2003 IBM Corporation
* Copyright 2000,2006 IBM Corporation
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
* Authors: Arnd Bergmann <arndb@de.ibm.com>
* Cornelia Huck <cornelia.huck@de.ibm.com>
*
* original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
*
@ -96,9 +97,9 @@ module_param(format, bool, 0444);
/**
* struct cmb_operations - functions to use depending on cmb_format
*
* all these functions operate on a struct cmf_device. There is only
* one instance of struct cmb_operations because all cmf_device
* objects are guaranteed to be of the same type.
* Most of these functions operate on a struct ccw_device. There is only
* one instance of struct cmb_operations because the format of the measurement
* data is guaranteed to be the same for every ccw_device.
*
* @alloc: allocate memory for a channel measurement block,
* either with the help of a special pool or with kmalloc
@ -107,6 +108,7 @@ module_param(format, bool, 0444);
* @readall: read a measurement block in a common format
* @reset: clear the data in the associated measurement block and
* reset its time stamp
* @align: align an allocated block so that the hardware can use it
*/
struct cmb_operations {
int (*alloc) (struct ccw_device*);
@ -115,11 +117,19 @@ struct cmb_operations {
u64 (*read) (struct ccw_device*, int);
int (*readall)(struct ccw_device*, struct cmbdata *);
void (*reset) (struct ccw_device*);
void * (*align) (void *);
struct attribute_group *attr_group;
};
static struct cmb_operations *cmbops;
struct cmb_data {
void *hw_block; /* Pointer to block updated by hardware */
void *last_block; /* Last changed block copied from hardware block */
int size; /* Size of hw_block and last_block */
unsigned long long last_update; /* when last_block was updated */
};
/* our user interface is designed in terms of nanoseconds,
* while the hardware measures total times in its own
* unit.*/
@ -226,63 +236,229 @@ struct set_schib_struct {
unsigned long address;
wait_queue_head_t wait;
int ret;
struct kref kref;
};
static void cmf_set_schib_release(struct kref *kref)
{
struct set_schib_struct *set_data;
set_data = container_of(kref, struct set_schib_struct, kref);
kfree(set_data);
}
#define CMF_PENDING 1
static int set_schib_wait(struct ccw_device *cdev, u32 mme,
int mbfc, unsigned long address)
{
struct set_schib_struct s = {
.mme = mme,
.mbfc = mbfc,
.address = address,
.wait = __WAIT_QUEUE_HEAD_INITIALIZER(s.wait),
};
struct set_schib_struct *set_data;
int ret;
spin_lock_irq(cdev->ccwlock);
s.ret = set_schib(cdev, mme, mbfc, address);
if (s.ret != -EBUSY) {
goto out_nowait;
if (!cdev->private->cmb) {
ret = -ENODEV;
goto out;
}
set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC);
if (!set_data) {
ret = -ENOMEM;
goto out;
}
init_waitqueue_head(&set_data->wait);
kref_init(&set_data->kref);
set_data->mme = mme;
set_data->mbfc = mbfc;
set_data->address = address;
ret = set_schib(cdev, mme, mbfc, address);
if (ret != -EBUSY)
goto out_put;
if (cdev->private->state != DEV_STATE_ONLINE) {
s.ret = -EBUSY;
/* if the device is not online, don't even try again */
goto out_nowait;
ret = -EBUSY;
goto out_put;
}
cdev->private->state = DEV_STATE_CMFCHANGE;
cdev->private->cmb_wait = &s;
s.ret = 1;
set_data->ret = CMF_PENDING;
cdev->private->cmb_wait = set_data;
spin_unlock_irq(cdev->ccwlock);
if (wait_event_interruptible(s.wait, s.ret != 1)) {
if (wait_event_interruptible(set_data->wait,
set_data->ret != CMF_PENDING)) {
spin_lock_irq(cdev->ccwlock);
if (s.ret == 1) {
s.ret = -ERESTARTSYS;
cdev->private->cmb_wait = 0;
if (set_data->ret == CMF_PENDING) {
set_data->ret = -ERESTARTSYS;
if (cdev->private->state == DEV_STATE_CMFCHANGE)
cdev->private->state = DEV_STATE_ONLINE;
}
spin_unlock_irq(cdev->ccwlock);
}
return s.ret;
out_nowait:
spin_lock_irq(cdev->ccwlock);
cdev->private->cmb_wait = NULL;
ret = set_data->ret;
out_put:
kref_put(&set_data->kref, cmf_set_schib_release);
out:
spin_unlock_irq(cdev->ccwlock);
return s.ret;
return ret;
}
void retry_set_schib(struct ccw_device *cdev)
{
struct set_schib_struct *s;
struct set_schib_struct *set_data;
s = cdev->private->cmb_wait;
cdev->private->cmb_wait = 0;
if (!s) {
set_data = cdev->private->cmb_wait;
if (!set_data) {
WARN_ON(1);
return;
}
s->ret = set_schib(cdev, s->mme, s->mbfc, s->address);
wake_up(&s->wait);
kref_get(&set_data->kref);
set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc,
set_data->address);
wake_up(&set_data->wait);
kref_put(&set_data->kref, cmf_set_schib_release);
}
static int cmf_copy_block(struct ccw_device *cdev)
{
struct subchannel *sch;
void *reference_buf;
void *hw_block;
struct cmb_data *cmb_data;
sch = to_subchannel(cdev->dev.parent);
if (stsch(sch->schid, &sch->schib))
return -ENODEV;
if (sch->schib.scsw.fctl & SCSW_FCTL_START_FUNC) {
/* Don't copy if a start function is in progress. */
if ((!sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED) &&
(sch->schib.scsw.actl &
(SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
(!sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS))
return -EBUSY;
}
cmb_data = cdev->private->cmb;
hw_block = cmbops->align(cmb_data->hw_block);
if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size))
/* No need to copy. */
return 0;
reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC);
if (!reference_buf)
return -ENOMEM;
/* Ensure consistency of block copied from hardware. */
do {
memcpy(cmb_data->last_block, hw_block, cmb_data->size);
memcpy(reference_buf, hw_block, cmb_data->size);
} while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size));
cmb_data->last_update = get_clock();
kfree(reference_buf);
return 0;
}
struct copy_block_struct {
wait_queue_head_t wait;
int ret;
struct kref kref;
};
static void cmf_copy_block_release(struct kref *kref)
{
struct copy_block_struct *copy_block;
copy_block = container_of(kref, struct copy_block_struct, kref);
kfree(copy_block);
}
static int cmf_cmb_copy_wait(struct ccw_device *cdev)
{
struct copy_block_struct *copy_block;
int ret;
unsigned long flags;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
ret = -ENODEV;
goto out;
}
copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC);
if (!copy_block) {
ret = -ENOMEM;
goto out;
}
init_waitqueue_head(&copy_block->wait);
kref_init(&copy_block->kref);
ret = cmf_copy_block(cdev);
if (ret != -EBUSY)
goto out_put;
if (cdev->private->state != DEV_STATE_ONLINE) {
ret = -EBUSY;
goto out_put;
}
cdev->private->state = DEV_STATE_CMFUPDATE;
copy_block->ret = CMF_PENDING;
cdev->private->cmb_wait = copy_block;
spin_unlock_irqrestore(cdev->ccwlock, flags);
if (wait_event_interruptible(copy_block->wait,
copy_block->ret != CMF_PENDING)) {
spin_lock_irqsave(cdev->ccwlock, flags);
if (copy_block->ret == CMF_PENDING) {
copy_block->ret = -ERESTARTSYS;
if (cdev->private->state == DEV_STATE_CMFUPDATE)
cdev->private->state = DEV_STATE_ONLINE;
}
spin_unlock_irqrestore(cdev->ccwlock, flags);
}
spin_lock_irqsave(cdev->ccwlock, flags);
cdev->private->cmb_wait = NULL;
ret = copy_block->ret;
out_put:
kref_put(&copy_block->kref, cmf_copy_block_release);
out:
spin_unlock_irqrestore(cdev->ccwlock, flags);
return ret;
}
void cmf_retry_copy_block(struct ccw_device *cdev)
{
struct copy_block_struct *copy_block;
copy_block = cdev->private->cmb_wait;
if (!copy_block) {
WARN_ON(1);
return;
}
kref_get(&copy_block->kref);
copy_block->ret = cmf_copy_block(cdev);
wake_up(&copy_block->wait);
kref_put(&copy_block->kref, cmf_copy_block_release);
}
static void cmf_generic_reset(struct ccw_device *cdev)
{
struct cmb_data *cmb_data;
spin_lock_irq(cdev->ccwlock);
cmb_data = cdev->private->cmb;
if (cmb_data) {
memset(cmb_data->last_block, 0, cmb_data->size);
/*
* Need to reset hw block as well to make the hardware start
* from 0 again.
*/
memset(cmbops->align(cmb_data->hw_block), 0, cmb_data->size);
cmb_data->last_update = 0;
}
cdev->private->cmb_start_time = get_clock();
spin_unlock_irq(cdev->ccwlock);
}
/**
@ -343,8 +519,8 @@ struct cmb {
/* insert a single device into the cmb_area list
* called with cmb_area.lock held from alloc_cmb
*/
static inline int
alloc_cmb_single (struct ccw_device *cdev)
static inline int alloc_cmb_single (struct ccw_device *cdev,
struct cmb_data *cmb_data)
{
struct cmb *cmb;
struct ccw_device_private *node;
@ -358,10 +534,12 @@ alloc_cmb_single (struct ccw_device *cdev)
/* find first unused cmb in cmb_area.mem.
* this is a little tricky: cmb_area.list
* remains sorted by ->cmb pointers */
* remains sorted by ->cmb->hw_data pointers */
cmb = cmb_area.mem;
list_for_each_entry(node, &cmb_area.list, cmb_list) {
if ((struct cmb*)node->cmb > cmb)
struct cmb_data *data;
data = node->cmb;
if ((struct cmb*)data->hw_block > cmb)
break;
cmb++;
}
@ -372,7 +550,8 @@ alloc_cmb_single (struct ccw_device *cdev)
/* insert new cmb */
list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
cdev->private->cmb = cmb;
cmb_data->hw_block = cmb;
cdev->private->cmb = cmb_data;
ret = 0;
out:
spin_unlock_irq(cdev->ccwlock);
@ -385,7 +564,19 @@ alloc_cmb (struct ccw_device *cdev)
int ret;
struct cmb *mem;
ssize_t size;
struct cmb_data *cmb_data;
/* Allocate private cmb_data. */
cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
if (!cmb_data)
return -ENOMEM;
cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
if (!cmb_data->last_block) {
kfree(cmb_data);
return -ENOMEM;
}
cmb_data->size = sizeof(struct cmb);
spin_lock(&cmb_area.lock);
if (!cmb_area.mem) {
@ -414,29 +605,36 @@ alloc_cmb (struct ccw_device *cdev)
}
/* do the actual allocation */
ret = alloc_cmb_single(cdev);
ret = alloc_cmb_single(cdev, cmb_data);
out:
spin_unlock(&cmb_area.lock);
if (ret) {
kfree(cmb_data->last_block);
kfree(cmb_data);
}
return ret;
}
static void
free_cmb(struct ccw_device *cdev)
static void free_cmb(struct ccw_device *cdev)
{
struct ccw_device_private *priv;
priv = cdev->private;
struct cmb_data *cmb_data;
spin_lock(&cmb_area.lock);
spin_lock_irq(cdev->ccwlock);
priv = cdev->private;
if (list_empty(&priv->cmb_list)) {
/* already freed */
goto out;
}
cmb_data = priv->cmb;
priv->cmb = NULL;
if (cmb_data)
kfree(cmb_data->last_block);
kfree(cmb_data);
list_del_init(&priv->cmb_list);
if (list_empty(&cmb_area.list)) {
@ -451,83 +649,97 @@ out:
spin_unlock(&cmb_area.lock);
}
static int
set_cmb(struct ccw_device *cdev, u32 mme)
static int set_cmb(struct ccw_device *cdev, u32 mme)
{
u16 offset;
struct cmb_data *cmb_data;
unsigned long flags;
if (!cdev->private->cmb)
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -EINVAL;
offset = mme ? (struct cmb *)cdev->private->cmb - cmb_area.mem : 0;
}
cmb_data = cdev->private->cmb;
offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0;
spin_unlock_irqrestore(cdev->ccwlock, flags);
return set_schib_wait(cdev, mme, 0, offset);
}
static u64
read_cmb (struct ccw_device *cdev, int index)
static u64 read_cmb (struct ccw_device *cdev, int index)
{
/* yes, we have to put it on the stack
* because the cmb must only be accessed
* atomically, e.g. with mvc */
struct cmb cmb;
unsigned long flags;
struct cmb *cmb;
u32 val;
int ret;
unsigned long flags;
ret = cmf_cmb_copy_wait(cdev);
if (ret < 0)
return 0;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return 0;
ret = 0;
goto out;
}
cmb = *(struct cmb*)cdev->private->cmb;
spin_unlock_irqrestore(cdev->ccwlock, flags);
cmb = ((struct cmb_data *)cdev->private->cmb)->last_block;
switch (index) {
case cmb_ssch_rsch_count:
return cmb.ssch_rsch_count;
ret = cmb->ssch_rsch_count;
goto out;
case cmb_sample_count:
return cmb.sample_count;
ret = cmb->sample_count;
goto out;
case cmb_device_connect_time:
val = cmb.device_connect_time;
val = cmb->device_connect_time;
break;
case cmb_function_pending_time:
val = cmb.function_pending_time;
val = cmb->function_pending_time;
break;
case cmb_device_disconnect_time:
val = cmb.device_disconnect_time;
val = cmb->device_disconnect_time;
break;
case cmb_control_unit_queuing_time:
val = cmb.control_unit_queuing_time;
val = cmb->control_unit_queuing_time;
break;
case cmb_device_active_only_time:
val = cmb.device_active_only_time;
val = cmb->device_active_only_time;
break;
default:
return 0;
ret = 0;
goto out;
}
return time_to_avg_nsec(val, cmb.sample_count);
ret = time_to_avg_nsec(val, cmb->sample_count);
out:
spin_unlock_irqrestore(cdev->ccwlock, flags);
return ret;
}
static int
readall_cmb (struct ccw_device *cdev, struct cmbdata *data)
static int readall_cmb (struct ccw_device *cdev, struct cmbdata *data)
{
/* yes, we have to put it on the stack
* because the cmb must only be accessed
* atomically, e.g. with mvc */
struct cmb cmb;
unsigned long flags;
struct cmb *cmb;
struct cmb_data *cmb_data;
u64 time;
unsigned long flags;
int ret;
ret = cmf_cmb_copy_wait(cdev);
if (ret < 0)
return ret;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -ENODEV;
cmb_data = cdev->private->cmb;
if (!cmb_data) {
ret = -ENODEV;
goto out;
}
cmb = *(struct cmb*)cdev->private->cmb;
time = get_clock() - cdev->private->cmb_start_time;
spin_unlock_irqrestore(cdev->ccwlock, flags);
if (cmb_data->last_update == 0) {
ret = -EAGAIN;
goto out;
}
cmb = cmb_data->last_block;
time = cmb_data->last_update - cdev->private->cmb_start_time;
memset(data, 0, sizeof(struct cmbdata));
@ -538,31 +750,32 @@ readall_cmb (struct ccw_device *cdev, struct cmbdata *data)
data->elapsed_time = (time * 1000) >> 12;
/* copy data to new structure */
data->ssch_rsch_count = cmb.ssch_rsch_count;
data->sample_count = cmb.sample_count;
data->ssch_rsch_count = cmb->ssch_rsch_count;
data->sample_count = cmb->sample_count;
/* time fields are converted to nanoseconds while copying */
data->device_connect_time = time_to_nsec(cmb.device_connect_time);
data->function_pending_time = time_to_nsec(cmb.function_pending_time);
data->device_disconnect_time = time_to_nsec(cmb.device_disconnect_time);
data->device_connect_time = time_to_nsec(cmb->device_connect_time);
data->function_pending_time = time_to_nsec(cmb->function_pending_time);
data->device_disconnect_time =
time_to_nsec(cmb->device_disconnect_time);
data->control_unit_queuing_time
= time_to_nsec(cmb.control_unit_queuing_time);
= time_to_nsec(cmb->control_unit_queuing_time);
data->device_active_only_time
= time_to_nsec(cmb.device_active_only_time);
return 0;
= time_to_nsec(cmb->device_active_only_time);
ret = 0;
out:
spin_unlock_irqrestore(cdev->ccwlock, flags);
return ret;
}
static void
reset_cmb(struct ccw_device *cdev)
static void reset_cmb(struct ccw_device *cdev)
{
struct cmb *cmb;
spin_lock_irq(cdev->ccwlock);
cmb = cdev->private->cmb;
if (cmb)
memset (cmb, 0, sizeof (*cmb));
cdev->private->cmb_start_time = get_clock();
spin_unlock_irq(cdev->ccwlock);
cmf_generic_reset(cdev);
}
static void * align_cmb(void *area)
{
return area;
}
static struct attribute_group cmf_attr_group;
@ -574,6 +787,7 @@ static struct cmb_operations cmbops_basic = {
.read = read_cmb,
.readall = readall_cmb,
.reset = reset_cmb,
.align = align_cmb,
.attr_group = &cmf_attr_group,
};
@ -610,22 +824,34 @@ static inline struct cmbe* cmbe_align(struct cmbe *c)
return (struct cmbe*)addr;
}
static int
alloc_cmbe (struct ccw_device *cdev)
static int alloc_cmbe (struct ccw_device *cdev)
{
struct cmbe *cmbe;
cmbe = kmalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
struct cmb_data *cmb_data;
int ret;
cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
if (!cmbe)
return -ENOMEM;
cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
if (!cmb_data) {
ret = -ENOMEM;
goto out_free;
}
cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
if (!cmb_data->last_block) {
ret = -ENOMEM;
goto out_free;
}
cmb_data->size = sizeof(struct cmbe);
spin_lock_irq(cdev->ccwlock);
if (cdev->private->cmb) {
kfree(cmbe);
spin_unlock_irq(cdev->ccwlock);
return -EBUSY;
ret = -EBUSY;
goto out_free;
}
cdev->private->cmb = cmbe;
cmb_data->hw_block = cmbe;
cdev->private->cmb = cmb_data;
spin_unlock_irq(cdev->ccwlock);
/* activate global measurement if this is the first channel */
@ -636,14 +862,24 @@ alloc_cmbe (struct ccw_device *cdev)
spin_unlock(&cmb_area.lock);
return 0;
out_free:
if (cmb_data)
kfree(cmb_data->last_block);
kfree(cmb_data);
kfree(cmbe);
return ret;
}
static void
free_cmbe (struct ccw_device *cdev)
static void free_cmbe (struct ccw_device *cdev)
{
struct cmb_data *cmb_data;
spin_lock_irq(cdev->ccwlock);
kfree(cdev->private->cmb);
cmb_data = cdev->private->cmb;
cdev->private->cmb = NULL;
if (cmb_data)
kfree(cmb_data->last_block);
kfree(cmb_data);
spin_unlock_irq(cdev->ccwlock);
/* deactivate global measurement if this is the last channel */
@ -654,89 +890,105 @@ free_cmbe (struct ccw_device *cdev)
spin_unlock(&cmb_area.lock);
}
static int
set_cmbe(struct ccw_device *cdev, u32 mme)
static int set_cmbe(struct ccw_device *cdev, u32 mme)
{
unsigned long mba;
struct cmb_data *cmb_data;
unsigned long flags;
if (!cdev->private->cmb)
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -EINVAL;
mba = mme ? (unsigned long) cmbe_align(cdev->private->cmb) : 0;
}
cmb_data = cdev->private->cmb;
mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0;
spin_unlock_irqrestore(cdev->ccwlock, flags);
return set_schib_wait(cdev, mme, 1, mba);
}
u64
read_cmbe (struct ccw_device *cdev, int index)
static u64 read_cmbe (struct ccw_device *cdev, int index)
{
/* yes, we have to put it on the stack
* because the cmb must only be accessed
* atomically, e.g. with mvc */
struct cmbe cmb;
unsigned long flags;
struct cmbe *cmb;
struct cmb_data *cmb_data;
u32 val;
int ret;
unsigned long flags;
ret = cmf_cmb_copy_wait(cdev);
if (ret < 0)
return 0;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return 0;
cmb_data = cdev->private->cmb;
if (!cmb_data) {
ret = 0;
goto out;
}
cmb = *cmbe_align(cdev->private->cmb);
spin_unlock_irqrestore(cdev->ccwlock, flags);
cmb = cmb_data->last_block;
switch (index) {
case cmb_ssch_rsch_count:
return cmb.ssch_rsch_count;
ret = cmb->ssch_rsch_count;
goto out;
case cmb_sample_count:
return cmb.sample_count;
ret = cmb->sample_count;
goto out;
case cmb_device_connect_time:
val = cmb.device_connect_time;
val = cmb->device_connect_time;
break;
case cmb_function_pending_time:
val = cmb.function_pending_time;
val = cmb->function_pending_time;
break;
case cmb_device_disconnect_time:
val = cmb.device_disconnect_time;
val = cmb->device_disconnect_time;
break;
case cmb_control_unit_queuing_time:
val = cmb.control_unit_queuing_time;
val = cmb->control_unit_queuing_time;
break;
case cmb_device_active_only_time:
val = cmb.device_active_only_time;
val = cmb->device_active_only_time;
break;
case cmb_device_busy_time:
val = cmb.device_busy_time;
val = cmb->device_busy_time;
break;
case cmb_initial_command_response_time:
val = cmb.initial_command_response_time;
val = cmb->initial_command_response_time;
break;
default:
return 0;
ret = 0;
goto out;
}
return time_to_avg_nsec(val, cmb.sample_count);
ret = time_to_avg_nsec(val, cmb->sample_count);
out:
spin_unlock_irqrestore(cdev->ccwlock, flags);
return ret;
}
static int
readall_cmbe (struct ccw_device *cdev, struct cmbdata *data)
static int readall_cmbe (struct ccw_device *cdev, struct cmbdata *data)
{
/* yes, we have to put it on the stack
* because the cmb must only be accessed
* atomically, e.g. with mvc */
struct cmbe cmb;
unsigned long flags;
struct cmbe *cmb;
struct cmb_data *cmb_data;
u64 time;
unsigned long flags;
int ret;
ret = cmf_cmb_copy_wait(cdev);
if (ret < 0)
return ret;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -ENODEV;
cmb_data = cdev->private->cmb;
if (!cmb_data) {
ret = -ENODEV;
goto out;
}
cmb = *cmbe_align(cdev->private->cmb);
time = get_clock() - cdev->private->cmb_start_time;
spin_unlock_irqrestore(cdev->ccwlock, flags);
if (cmb_data->last_update == 0) {
ret = -EAGAIN;
goto out;
}
time = cmb_data->last_update - cdev->private->cmb_start_time;
memset (data, 0, sizeof(struct cmbdata));
@ -746,35 +998,38 @@ readall_cmbe (struct ccw_device *cdev, struct cmbdata *data)
/* conver to nanoseconds */
data->elapsed_time = (time * 1000) >> 12;
cmb = cmb_data->last_block;
/* copy data to new structure */
data->ssch_rsch_count = cmb.ssch_rsch_count;
data->sample_count = cmb.sample_count;
data->ssch_rsch_count = cmb->ssch_rsch_count;
data->sample_count = cmb->sample_count;
/* time fields are converted to nanoseconds while copying */
data->device_connect_time = time_to_nsec(cmb.device_connect_time);
data->function_pending_time = time_to_nsec(cmb.function_pending_time);
data->device_disconnect_time = time_to_nsec(cmb.device_disconnect_time);
data->device_connect_time = time_to_nsec(cmb->device_connect_time);
data->function_pending_time = time_to_nsec(cmb->function_pending_time);
data->device_disconnect_time =
time_to_nsec(cmb->device_disconnect_time);
data->control_unit_queuing_time
= time_to_nsec(cmb.control_unit_queuing_time);
= time_to_nsec(cmb->control_unit_queuing_time);
data->device_active_only_time
= time_to_nsec(cmb.device_active_only_time);
data->device_busy_time = time_to_nsec(cmb.device_busy_time);
= time_to_nsec(cmb->device_active_only_time);
data->device_busy_time = time_to_nsec(cmb->device_busy_time);
data->initial_command_response_time
= time_to_nsec(cmb.initial_command_response_time);
= time_to_nsec(cmb->initial_command_response_time);
return 0;
ret = 0;
out:
spin_unlock_irqrestore(cdev->ccwlock, flags);
return ret;
}
static void
reset_cmbe(struct ccw_device *cdev)
static void reset_cmbe(struct ccw_device *cdev)
{
struct cmbe *cmb;
spin_lock_irq(cdev->ccwlock);
cmb = cmbe_align(cdev->private->cmb);
if (cmb)
memset (cmb, 0, sizeof (*cmb));
cdev->private->cmb_start_time = get_clock();
spin_unlock_irq(cdev->ccwlock);
cmf_generic_reset(cdev);
}
static void * align_cmbe(void *area)
{
return cmbe_align(area);
}
static struct attribute_group cmf_attr_group_ext;
@ -786,6 +1041,7 @@ static struct cmb_operations cmbops_extended = {
.read = read_cmbe,
.readall = readall_cmbe,
.reset = reset_cmbe,
.align = align_cmbe,
.attr_group = &cmf_attr_group_ext,
};
@ -803,14 +1059,19 @@ cmb_show_avg_sample_interval(struct device *dev, struct device_attribute *attr,
struct ccw_device *cdev;
long interval;
unsigned long count;
struct cmb_data *cmb_data;
cdev = to_ccwdev(dev);
interval = get_clock() - cdev->private->cmb_start_time;
count = cmf_read(cdev, cmb_sample_count);
if (count)
spin_lock_irq(cdev->ccwlock);
cmb_data = cdev->private->cmb;
if (count) {
interval = cmb_data->last_update -
cdev->private->cmb_start_time;
interval /= count;
else
} else
interval = -1;
spin_unlock_irq(cdev->ccwlock);
return sprintf(buf, "%ld\n", interval);
}
@ -823,7 +1084,10 @@ cmb_show_avg_utilization(struct device *dev, struct device_attribute *attr, char
int ret;
ret = cmf_readall(to_ccwdev(dev), &data);
if (ret)
if (ret == -EAGAIN || ret == -ENODEV)
/* No data (yet/currently) available to use for calculation. */
return sprintf(buf, "n/a\n");
else if (ret)
return ret;
utilization = data.device_connect_time +
@ -982,6 +1246,13 @@ cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
return cmbops->readall(cdev, data);
}
/* Reenable cmf when a disconnected device becomes available again. */
int cmf_reenable(struct ccw_device *cdev)
{
cmbops->reset(cdev);
return cmbops->set(cdev, 2);
}
static int __init
init_cmf(void)
{

4
drivers/s390/cio/device.h
View file

@ -27,6 +27,7 @@ enum dev_state {
DEV_STATE_DISCONNECTED,
DEV_STATE_DISCONNECTED_SENSE_ID,
DEV_STATE_CMFCHANGE,
DEV_STATE_CMFUPDATE,
/* last element! */
NR_DEV_STATES
};
@ -118,5 +119,8 @@ int ccw_device_stlck(struct ccw_device *);
void ccw_device_set_timeout(struct ccw_device *, int);
extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
/* Channel measurement facility related */
void retry_set_schib(struct ccw_device *cdev);
void cmf_retry_copy_block(struct ccw_device *);
int cmf_reenable(struct ccw_device *);
#endif

18
drivers/s390/cio/device_fsm.c
View file

@ -336,8 +336,11 @@ ccw_device_oper_notify(void *data)
if (!ret)
/* Driver doesn't want device back. */
ccw_device_do_unreg_rereg((void *)cdev);
else
else {
/* Reenable channel measurements, if needed. */
cmf_reenable(cdev);
wake_up(&cdev->private->wait_q);
}
}
/*
@ -1095,6 +1098,13 @@ ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
dev_fsm_event(cdev, dev_event);
}
static void ccw_device_update_cmfblock(struct ccw_device *cdev,
enum dev_event dev_event)
{
cmf_retry_copy_block(cdev);
cdev->private->state = DEV_STATE_ONLINE;
dev_fsm_event(cdev, dev_event);
}
static void
ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
@ -1249,6 +1259,12 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
[DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
},
[DEV_STATE_CMFUPDATE] = {
[DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
[DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
[DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
[DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
},
};
/*

4
include/asm-s390/cmb.h
View file

@ -44,10 +44,6 @@ struct cmbdata {
#define BIODASDCMFENABLE _IO(DASD_IOCTL_LETTER,32)
/* enable channel measurement */
#define BIODASDCMFDISABLE _IO(DASD_IOCTL_LETTER,33)
/* reset channel measurement block */
#define BIODASDRESETCMB _IO(DASD_IOCTL_LETTER,34)
/* read channel measurement data */
#define BIODASDREADCMB _IOWR(DASD_IOCTL_LETTER,32,__u64)
/* read channel measurement data */
#define BIODASDREADALLCMB _IOWR(DASD_IOCTL_LETTER,33,struct cmbdata)