/*
* linux/drivers/s390/cio/cmf.c ($Revision: 1.16 $)
*
* Linux on zSeries Channel Measurement Facility support
*
* Copyright 2000,2003 IBM Corporation
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/bootmem.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/timex.h> /* get_clock() */
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/cmb.h>
#include <asm/div64.h>
#include "cio.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
#include "chsc.h"
/* parameter to enable cmf during boot, possible uses are:
* "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be
* used on any subchannel
* "s390cmf=<num>" -- enable cmf and allocate enough memory to measure
* <num> subchannel, where <num> is an integer
* between 1 and 65535, default is 1024
*/
#define ARGSTRING "s390cmf"
/* indices for READCMB */
enum cmb_index {
/* basic and exended format: */
cmb_ssch_rsch_count,
cmb_sample_count,
cmb_device_connect_time,
cmb_function_pending_time,
cmb_device_disconnect_time,
cmb_control_unit_queuing_time,
cmb_device_active_only_time,
/* extended format only: */
cmb_device_busy_time,
cmb_initial_command_response_time,
};
/**
* enum cmb_format - types of supported measurement block formats
*
* @CMF_BASIC: traditional channel measurement blocks supported
* by all machines that we run on
* @CMF_EXTENDED: improved format that was introduced with the z990
* machine
* @CMF_AUTODETECT: default: use extended format when running on a z990
* or later machine, otherwise fall back to basic format
**/
enum cmb_format {
CMF_BASIC,
CMF_EXTENDED,
CMF_AUTODETECT = -1,
};
/**
* format - actual format for all measurement blocks
*
* The format module parameter can be set to a value of 0 (zero)
* or 1, indicating basic or extended format as described for
* enum cmb_format.
*/
static int format = CMF_AUTODETECT;
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.
*
* @alloc: allocate memory for a channel measurement block,
* either with the help of a special pool or with kmalloc
* @free: free memory allocated with @alloc
* @set: enable or disable measurement
* @readall: read a measurement block in a common format
* @reset: clear the data in the associated measurement block and
* reset its time stamp
*/
struct cmb_operations {
int (*alloc) (struct ccw_device*);
void(*free) (struct ccw_device*);
int (*set) (struct ccw_device*, u32);
u64 (*read) (struct ccw_device*, int);
int (*readall)(struct ccw_device*, struct cmbdata *);
void (*reset) (struct ccw_device*);
struct attribute_group *attr_group;
};
static struct cmb_operations *cmbops;
/* our user interface is designed in terms of nanoseconds,
* while the hardware measures total times in its own
* unit.*/
static inline u64 time_to_nsec(u32 value)
{
return ((u64)value) * 128000ull;
}
/*
* Users are usually interested in average times,
* not accumulated time.
* This also helps us with atomicity problems
* when reading sinlge values.
*/
static inline u64 time_to_avg_nsec(u32 value, u32 count)
{
u64 ret;
/* no samples yet, avoid division by 0 */
if (count == 0)
return 0;
/* value comes in units of 128 µsec */
ret = time_to_nsec(value);
do_div(ret, count);
return ret;
}
/* activate or deactivate the channel monitor. When area is NULL,
* the monitor is deactivated. The channel monitor needs to
* be active in order to measure subchannels, which also need
* to be enabled. */
static inline void
cmf_activate(void *area, unsigned int onoff)
{
register void * __gpr2 asm("2");
register long __gpr1 asm("1");
__gpr2 = area;
__gpr1 = onoff ? 2 : 0;
/* activate channel measurement */
asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
}
static int
set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
{
int ret;
int retry;
struct subchannel *sch;
struct schib *schib;
sch = to_subchannel(cdev->dev.parent);
schib = &sch->schib;
/* msch can silently fail, so do it again if necessary */
for (retry = 0; retry < 3; retry++) {
/* prepare schib */
stsch(sch->irq, schib);
schib->pmcw.mme = mme;
schib->pmcw.mbfc = mbfc;
/* address can be either a block address or a block index */
if (mbfc)
schib->mba = address;
else
schib->pmcw.mbi = address;
/* try to submit it */
switch(ret = msch_err(sch->irq, schib)) {
case 0:
break;
case 1:
case 2: /* in I/O or status pending */
ret = -EBUSY;
break;
case 3: /* subchannel is no longer valid */
ret = -ENODEV;
break;
default: /* msch caught an exception */
ret = -EINVAL;
break;
}
stsch(sch->irq, schib); /* restore the schib */
if (ret)
break;
/* check if it worked */
if (schib->pmcw.mme == mme &&
schib->pmcw.mbfc == mbfc &&
(mbfc ? (schib->mba == address)
: (schib->pmcw.mbi == address)))
return 0;
ret = -EINVAL;
}
return ret;
}
struct set_schib_struct {
u32 mme;
int mbfc;
unsigned long address;
wait_queue_head_t wait;
int ret;
};
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),
};
spin_lock_irq(cdev->ccwlock);
s.ret = set_schib(cdev, mme, mbfc, address);
if (s.ret != -EBUSY) {
goto out_nowait;
}
if (cdev->private->state != DEV_STATE_ONLINE) {
s.ret = -EBUSY;
/* if the device is not online, don't even try again */
goto out_nowait;
}
cdev->private->state = DEV_STATE_CMFCHANGE;
cdev->private->cmb_wait = &s;
s.ret = 1;
spin_unlock_irq(cdev->ccwlock);
if (wait_event_interruptible(s.wait, s.ret != 1)) {
spin_lock_irq(cdev->ccwlock);
if (s.ret == 1) {
s.ret = -ERESTARTSYS;
cdev->private->cmb_wait = 0;
if (cdev->private->state == DEV_STATE_CMFCHANGE)
cdev->private->state = DEV_STATE_ONLINE;
}
spin_unlock_irq(cdev->ccwlock);
}
return s.ret;
out_nowait:
spin_unlock_irq(cdev->ccwlock);
return s.ret;
}
void retry_set_schib(struct ccw_device *cdev)
{
struct set_schib_struct *s;
s = cdev->private->cmb_wait;
cdev->private->cmb_wait = 0;
if (!s) {
WARN_ON(1);
return;
}
s->ret = set_schib(cdev, s->mme, s->mbfc, s->address);
wake_up(&s->wait);
}
/**
* struct cmb_area - container for global cmb data
*
* @mem: pointer to CMBs (only in basic measurement mode)
* @list: contains a linked list of all subchannels
* @lock: protect concurrent access to @mem and @list
*/
struct cmb_area {
struct cmb *mem;
struct list_head list;
int num_channels;
spinlock_t lock;
};
static struct cmb_area cmb_area = {
.lock = SPIN_LOCK_UNLOCKED,
.list = LIST_HEAD_INIT(cmb_area.list),
.num_channels = 1024,
};
/* ****** old style CMB handling ********/
/** int maxchannels
*
* Basic channel measurement blocks are allocated in one contiguous
* block of memory, which can not be moved as long as any channel
* is active. Therefore, a maximum number of subchannels needs to
* be defined somewhere. This is a module parameter, defaulting to
* a resonable value of 1024, or 32 kb of memory.
* Current kernels don't allow kmalloc with more than 128kb, so the
* maximum is 4096
*/
module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
/**
* struct cmb - basic channel measurement block
*
* cmb as used by the hardware the fields are described in z/Architecture
* Principles of Operation, chapter 17.
* The area to be a contiguous array and may not be reallocated or freed.
* Only one cmb area can be present in the system.
*/
struct cmb {
u16 ssch_rsch_count;
u16 sample_count;
u32 device_connect_time;
u32 function_pending_time;
u32 device_disconnect_time;
u32 control_unit_queuing_time;
u32 device_active_only_time;
u32 reserved[2];
};
/* 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)
{
struct cmb *cmb;
struct ccw_device_private *node;
int ret;
spin_lock_irq(cdev->ccwlock);
if (!list_empty(&cdev->private->cmb_list)) {
ret = -EBUSY;
goto out;
}
/* find first unused cmb in cmb_area.mem.
* this is a little tricky: cmb_area.list
* remains sorted by ->cmb pointers */
cmb = cmb_area.mem;
list_for_each_entry(node, &cmb_area.list, cmb_list) {
if ((struct cmb*)node->cmb > cmb)
break;
cmb++;
}
if (cmb - cmb_area.mem >= cmb_area.num_channels) {
ret = -ENOMEM;
goto out;
}
/* insert new cmb */
list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
cdev->private->cmb = cmb;
ret = 0;
out:
spin_unlock_irq(cdev->ccwlock);
return ret;
}
static int
alloc_cmb (struct ccw_device *cdev)
{
int ret;
struct cmb *mem;
ssize_t size;
spin_lock(&cmb_area.lock);
if (!cmb_area.mem) {
/* there is no user yet, so we need a new area */
size = sizeof(struct cmb) * cmb_area.num_channels;
WARN_ON(!list_empty(&cmb_area.list));
spin_unlock(&cmb_area.lock);
mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
get_order(size));
spin_lock(&cmb_area.lock);
if (cmb_area.mem) {
/* ok, another thread was faster */
free_pages((unsigned long)mem, get_order(size));
} else if (!mem) {
/* no luck */
ret = -ENOMEM;
goto out;
} else {
/* everything ok */
memset(mem, 0, size);
cmb_area.mem = mem;
cmf_activate(cmb_area.mem, 1);
}
}
/* do the actual allocation */
ret = alloc_cmb_single(cdev);
out:
spin_unlock(&cmb_area.lock);
return ret;
}
static void
free_cmb(struct ccw_device *cdev)
{
struct ccw_device_private *priv;
priv = cdev->private;
spin_lock(&cmb_area.lock);
spin_lock_irq(cdev->ccwlock);
if (list_empty(&priv->cmb_list)) {
/* already freed */
goto out;
}
priv->cmb = NULL;
list_del_init(&priv->cmb_list);
if (list_empty(&cmb_area.list)) {
ssize_t size;
size = sizeof(struct cmb) * cmb_area.num_channels;
cmf_activate(NULL, 0);
free_pages((unsigned long)cmb_area.mem, get_order(size));
cmb_area.mem = NULL;
}
out:
spin_unlock_irq(cdev->ccwlock);
spin_unlock(&cmb_area.lock);
}
static int
set_cmb(struct ccw_device *cdev, u32 mme)
{
u16 offset;
if (!cdev->private->cmb)
return -EINVAL;
offset = mme ? (struct cmb *)cdev->private->cmb - cmb_area.mem : 0;
return set_schib_wait(cdev, mme, 0, offset);
}
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;
u32 val;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return 0;
}
cmb = *(struct cmb*)cdev->private->cmb;
spin_unlock_irqrestore(cdev->ccwlock, flags);
switch (index) {
case cmb_ssch_rsch_count:
return cmb.ssch_rsch_count;
case cmb_sample_count:
return cmb.sample_count;
case cmb_device_connect_time:
val = cmb.device_connect_time;
break;
case cmb_function_pending_time:
val = cmb.function_pending_time;
break;
case cmb_device_disconnect_time:
val = cmb.device_disconnect_time;
break;
case cmb_control_unit_queuing_time:
val = cmb.control_unit_queuing_time;
break;
case cmb_device_active_only_time:
val = cmb.device_active_only_time;
break;
default:
return 0;
}
return time_to_avg_nsec(val, cmb.sample_count);
}
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;
u64 time;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -ENODEV;
}
cmb = *(struct cmb*)cdev->private->cmb;
time = get_clock() - cdev->private->cmb_start_time;
spin_unlock_irqrestore(cdev->ccwlock, flags);
memset(data, 0, sizeof(struct cmbdata));
/* we only know values before device_busy_time */
data->size = offsetof(struct cmbdata, device_busy_time);
/* convert to nanoseconds */
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;
/* 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->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;
}
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);
}
static struct attribute_group cmf_attr_group;
static struct cmb_operations cmbops_basic = {
.alloc = alloc_cmb,
.free = free_cmb,
.set = set_cmb,
.read = read_cmb,
.readall = readall_cmb,
.reset = reset_cmb,
.attr_group = &cmf_attr_group,
};
/* ******** extended cmb handling ********/
/**
* struct cmbe - extended channel measurement block
*
* cmb as used by the hardware, may be in any 64 bit physical location,
* the fields are described in z/Architecture Principles of Operation,
* third edition, chapter 17.
*/
struct cmbe {
u32 ssch_rsch_count;
u32 sample_count;
u32 device_connect_time;
u32 function_pending_time;
u32 device_disconnect_time;
u32 control_unit_queuing_time;
u32 device_active_only_time;
u32 device_busy_time;
u32 initial_command_response_time;
u32 reserved[7];
};
/* kmalloc only guarantees 8 byte alignment, but we need cmbe
* pointers to be naturally aligned. Make sure to allocate
* enough space for two cmbes */
static inline struct cmbe* cmbe_align(struct cmbe *c)
{
unsigned long addr;
addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) &
~(sizeof (struct cmbe) - sizeof(long));
return (struct cmbe*)addr;
}
static int
alloc_cmbe (struct ccw_device *cdev)
{
struct cmbe *cmbe;
cmbe = kmalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
if (!cmbe)
return -ENOMEM;
spin_lock_irq(cdev->ccwlock);
if (cdev->private->cmb) {
kfree(cmbe);
spin_unlock_irq(cdev->ccwlock);
return -EBUSY;
}
cdev->private->cmb = cmbe;
spin_unlock_irq(cdev->ccwlock);
/* activate global measurement if this is the first channel */
spin_lock(&cmb_area.lock);
if (list_empty(&cmb_area.list))
cmf_activate(NULL, 1);
list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
spin_unlock(&cmb_area.lock);
return 0;
}
static void
free_cmbe (struct ccw_device *cdev)
{
spin_lock_irq(cdev->ccwlock);
if (cdev->private->cmb)
kfree(cdev->private->cmb);
cdev->private->cmb = NULL;
spin_unlock_irq(cdev->ccwlock);
/* deactivate global measurement if this is the last channel */
spin_lock(&cmb_area.lock);
list_del_init(&cdev->private->cmb_list);
if (list_empty(&cmb_area.list))
cmf_activate(NULL, 0);
spin_unlock(&cmb_area.lock);
}
static int
set_cmbe(struct ccw_device *cdev, u32 mme)
{
unsigned long mba;
if (!cdev->private->cmb)
return -EINVAL;
mba = mme ? (unsigned long) cmbe_align(cdev->private->cmb) : 0;
return set_schib_wait(cdev, mme, 1, mba);
}
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;
u32 val;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return 0;
}
cmb = *cmbe_align(cdev->private->cmb);
spin_unlock_irqrestore(cdev->ccwlock, flags);
switch (index) {
case cmb_ssch_rsch_count:
return cmb.ssch_rsch_count;
case cmb_sample_count:
return cmb.sample_count;
case cmb_device_connect_time:
val = cmb.device_connect_time;
break;
case cmb_function_pending_time:
val = cmb.function_pending_time;
break;
case cmb_device_disconnect_time:
val = cmb.device_disconnect_time;
break;
case cmb_control_unit_queuing_time:
val = cmb.control_unit_queuing_time;
break;
case cmb_device_active_only_time:
val = cmb.device_active_only_time;
break;
case cmb_device_busy_time:
val = cmb.device_busy_time;
break;
case cmb_initial_command_response_time:
val = cmb.initial_command_response_time;
break;
default:
return 0;
}
return time_to_avg_nsec(val, cmb.sample_count);
}
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;
u64 time;
spin_lock_irqsave(cdev->ccwlock, flags);
if (!cdev->private->cmb) {
spin_unlock_irqrestore(cdev->ccwlock, flags);
return -ENODEV;
}
cmb = *cmbe_align(cdev->private->cmb);
time = get_clock() - cdev->private->cmb_start_time;
spin_unlock_irqrestore(cdev->ccwlock, flags);
memset (data, 0, sizeof(struct cmbdata));
/* we only know values before device_busy_time */
data->size = offsetof(struct cmbdata, device_busy_time);
/* conver to nanoseconds */
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;
/* 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->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);
data->initial_command_response_time
= time_to_nsec(cmb.initial_command_response_time);
return 0;
}
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);
}
static struct attribute_group cmf_attr_group_ext;
static struct cmb_operations cmbops_extended = {
.alloc = alloc_cmbe,
.free = free_cmbe,
.set = set_cmbe,
.read = read_cmbe,
.readall = readall_cmbe,
.reset = reset_cmbe,
.attr_group = &cmf_attr_group_ext,
};
static ssize_t
cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
{
return sprintf(buf, "%lld\n",
(unsigned long long) cmf_read(to_ccwdev(dev), idx));
}
static ssize_t
cmb_show_avg_sample_interval(struct device *dev, struct device_attribute *attr, char *buf)
{
struct ccw_device *cdev;
long interval;
unsigned long count;
cdev = to_ccwdev(dev);
interval = get_clock() - cdev->private->cmb_start_time;
count = cmf_read(cdev, cmb_sample_count);
if (count)
interval /= count;
else
interval = -1;
return sprintf(buf, "%ld\n", interval);
}
static ssize_t
cmb_show_avg_utilization(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cmbdata data;
u64 utilization;
unsigned long t, u;
int ret;
ret = cmf_readall(to_ccwdev(dev), &data);
if (ret)
return ret;
utilization = data.device_connect_time +
data.function_pending_time +
data.device_disconnect_time;
/* shift to avoid long long division */
while (-1ul < (data.elapsed_time | utilization)) {
utilization >>= 8;
data.elapsed_time >>= 8;
}
/* calculate value in 0.1 percent units */
t = (unsigned long) data.elapsed_time / 1000;
u = (unsigned long) utilization / t;
return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10);
}
#define cmf_attr(name) \
static ssize_t show_ ## name (struct device * dev, struct device_attribute *attr, char * buf) \
{ return cmb_show_attr((dev), buf, cmb_ ## name); } \
static DEVICE_ATTR(name, 0444, show_ ## name, NULL);
#define cmf_attr_avg(name) \
static ssize_t show_avg_ ## name (struct device * dev, struct device_attribute *attr, char * buf) \
{ return cmb_show_attr((dev), buf, cmb_ ## name); } \
static DEVICE_ATTR(avg_ ## name, 0444, show_avg_ ## name, NULL);
cmf_attr(ssch_rsch_count);
cmf_attr(sample_count);
cmf_attr_avg(device_connect_time);
cmf_attr_avg(function_pending_time);
cmf_attr_avg(device_disconnect_time);
cmf_attr_avg(control_unit_queuing_time);
cmf_attr_avg(device_active_only_time);
cmf_attr_avg(device_busy_time);
cmf_attr_avg(initial_command_response_time);
static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval, NULL);
static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
static struct attribute *cmf_attributes[] = {
&dev_attr_avg_sample_interval.attr,
&dev_attr_avg_utilization.attr,
&dev_attr_ssch_rsch_count.attr,
&dev_attr_sample_count.attr,
&dev_attr_avg_device_connect_time.attr,
&dev_attr_avg_function_pending_time.attr,
&dev_attr_avg_device_disconnect_time.attr,
&dev_attr_avg_control_unit_queuing_time.attr,
&dev_attr_avg_device_active_only_time.attr,
0,
};
static struct attribute_group cmf_attr_group = {
.name = "cmf",
.attrs = cmf_attributes,
};
static struct attribute *cmf_attributes_ext[] = {
&dev_attr_avg_sample_interval.attr,
&dev_attr_avg_utilization.attr,
&dev_attr_ssch_rsch_count.attr,
&dev_attr_sample_count.attr,
&dev_attr_avg_device_connect_time.attr,
&dev_attr_avg_function_pending_time.attr,
&dev_attr_avg_device_disconnect_time.attr,
&dev_attr_avg_control_unit_queuing_time.attr,
&dev_attr_avg_device_active_only_time.attr,
&dev_attr_avg_device_busy_time.attr,
&dev_attr_avg_initial_command_response_time.attr,
0,
};
static struct attribute_group cmf_attr_group_ext = {
.name = "cmf",
.attrs = cmf_attributes_ext,
};
static ssize_t cmb_enable_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0);
}
static ssize_t cmb_enable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t c)
{
struct ccw_device *cdev;
int ret;
cdev = to_ccwdev(dev);
switch (buf[0]) {
case '0':
ret = disable_cmf(cdev);
if (ret)
printk(KERN_INFO "disable_cmf failed (%d)\n", ret);
break;
case '1':
ret = enable_cmf(cdev);
if (ret && ret != -EBUSY)
printk(KERN_INFO "enable_cmf failed (%d)\n", ret);
break;
}
return c;
}
DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
/* enable_cmf/disable_cmf: module interface for cmf (de)activation */
int
enable_cmf(struct ccw_device *cdev)
{
int ret;
ret = cmbops->alloc(cdev);
cmbops->reset(cdev);
if (ret)
return ret;
ret = cmbops->set(cdev, 2);
if (ret) {
cmbops->free(cdev);
return ret;
}
ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
if (!ret)
return 0;
cmbops->set(cdev, 0); //FIXME: this can fail
cmbops->free(cdev);
return ret;
}
int
disable_cmf(struct ccw_device *cdev)
{
int ret;
ret = cmbops->set(cdev, 0);
if (ret)
return ret;
cmbops->free(cdev);
sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
return ret;
}
u64
cmf_read(struct ccw_device *cdev, int index)
{
return cmbops->read(cdev, index);
}
int
cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
{
return cmbops->readall(cdev, data);
}
static int __init
init_cmf(void)
{
char *format_string;
char *detect_string = "parameter";
/* We cannot really autoprobe this. If the user did not give a parameter,
see if we are running on z990 or up, otherwise fall back to basic mode. */
if (format == CMF_AUTODETECT) {
if (!css_characteristics_avail ||
!css_general_characteristics.ext_mb) {
format = CMF_BASIC;
} else {
format = CMF_EXTENDED;
}
detect_string = "autodetected";
} else {
detect_string = "parameter";
}
switch (format) {
case CMF_BASIC:
format_string = "basic";
cmbops = &cmbops_basic;
if (cmb_area.num_channels > 4096 || cmb_area.num_channels < 1) {
printk(KERN_ERR "Basic channel measurement facility"
" can only use 1 to 4096 devices\n"
KERN_ERR "when the cmf driver is built"
" as a loadable module\n");
return 1;
}
break;
case CMF_EXTENDED:
format_string = "extended";
cmbops = &cmbops_extended;
break;
default:
printk(KERN_ERR "Invalid format %d for channel "
"measurement facility\n", format);
return 1;
}
printk(KERN_INFO "Channel measurement facility using %s format (%s)\n",
format_string, detect_string);
return 0;
}
module_init(init_cmf);
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("channel measurement facility base driver\n"
"Copyright 2003 IBM Corporation\n");
EXPORT_SYMBOL_GPL(enable_cmf);
EXPORT_SYMBOL_GPL(disable_cmf);
EXPORT_SYMBOL_GPL(cmf_read);
EXPORT_SYMBOL_GPL(cmf_readall);
