aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/cio/cmf.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/cio/cmf.c')
-rw-r--r--drivers/s390/cio/cmf.c242
1 files changed, 155 insertions, 87 deletions
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 02fd00b55e1..b960f66843e 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -45,7 +45,8 @@
#include "ioasm.h"
#include "chsc.h"
-/* parameter to enable cmf during boot, possible uses are:
+/*
+ * 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
@@ -73,18 +74,20 @@ enum cmb_index {
* enum cmb_format - types of supported measurement block formats
*
* @CMF_BASIC: traditional channel measurement blocks supported
- * by all machines that we run on
+ * 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
- **/
+ * machine
+ * @CMF_AUTODETECT: default: use extended format when running on a machine
+ * supporting extended format, 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)
@@ -105,20 +108,21 @@ module_param(format, bool, 0444);
* either with the help of a special pool or with kmalloc
* @free: free memory allocated with @alloc
* @set: enable or disable measurement
+ * @read: read a measurement entry at an index
* @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*);
- 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*);
- void * (*align) (void *);
-
+ 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 *);
+ void *(*align) (void *);
+/* private: */
struct attribute_group *attr_group;
};
static struct cmb_operations *cmbops;
@@ -130,9 +134,11 @@ struct cmb_data {
unsigned long long last_update; /* when last_block was updated */
};
-/* our user interface is designed in terms of nanoseconds,
+/*
+ * Our user interface is designed in terms of nanoseconds,
* while the hardware measures total times in its own
- * unit.*/
+ * unit.
+ */
static inline u64 time_to_nsec(u32 value)
{
return ((u64)value) * 128000ull;
@@ -159,12 +165,13 @@ static inline u64 time_to_avg_nsec(u32 value, u32 count)
return ret;
}
-/* activate or deactivate the channel monitor. When area is NULL,
+/*
+ * 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)
+ * to be enabled.
+ */
+static inline void cmf_activate(void *area, unsigned int onoff)
{
register void * __gpr2 asm("2");
register long __gpr1 asm("1");
@@ -175,8 +182,8 @@ cmf_activate(void *area, unsigned int onoff)
asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
}
-static int
-set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
+static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
+ unsigned long address)
{
int ret;
int retry;
@@ -466,6 +473,7 @@ static void cmf_generic_reset(struct ccw_device *cdev)
*
* @mem: pointer to CMBs (only in basic measurement mode)
* @list: contains a linked list of all subchannels
+ * @num_channels: number of channels to be measured
* @lock: protect concurrent access to @mem and @list
*/
struct cmb_area {
@@ -481,28 +489,36 @@ static struct cmb_area cmb_area = {
.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
+ * maximum is 4096.
*/
module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
/**
* struct cmb - basic channel measurement block
+ * @ssch_rsch_count: number of ssch and rsch
+ * @sample_count: number of samples
+ * @device_connect_time: time of device connect
+ * @function_pending_time: time of function pending
+ * @device_disconnect_time: time of device disconnect
+ * @control_unit_queuing_time: time of control unit queuing
+ * @device_active_only_time: time of device active only
+ * @reserved: unused in basic measurement mode
*
- * 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.
+ * The measurement block as used by the hardware. The fields are described
+ * further in z/Architecture Principles of Operation, chapter 17.
+ *
+ * The cmb area made up from these blocks must be a contiguous array and may
+ * not be reallocated or freed.
* Only one cmb area can be present in the system.
*/
struct cmb {
@@ -516,8 +532,9 @@ struct cmb {
u32 reserved[2];
};
-/* insert a single device into the cmb_area list
- * called with cmb_area.lock held from alloc_cmb
+/*
+ * Insert a single device into the cmb_area list.
+ * Called with cmb_area.lock held from alloc_cmb.
*/
static int alloc_cmb_single(struct ccw_device *cdev,
struct cmb_data *cmb_data)
@@ -532,9 +549,11 @@ static int alloc_cmb_single(struct ccw_device *cdev,
goto out;
}
- /* find first unused cmb in cmb_area.mem.
- * this is a little tricky: cmb_area.list
- * remains sorted by ->cmb->hw_data pointers */
+ /*
+ * Find first unused cmb in cmb_area.mem.
+ * This is a little tricky: cmb_area.list
+ * remains sorted by ->cmb->hw_data pointers.
+ */
cmb = cmb_area.mem;
list_for_each_entry(node, &cmb_area.list, cmb_list) {
struct cmb_data *data;
@@ -558,8 +577,7 @@ out:
return ret;
}
-static int
-alloc_cmb (struct ccw_device *cdev)
+static int alloc_cmb(struct ccw_device *cdev)
{
int ret;
struct cmb *mem;
@@ -594,6 +612,9 @@ alloc_cmb (struct ccw_device *cdev)
free_pages((unsigned long)mem, get_order(size));
} else if (!mem) {
/* no luck */
+ printk(KERN_WARNING "cio: failed to allocate area "
+ "for measuring %d subchannels\n",
+ cmb_area.num_channels);
ret = -ENOMEM;
goto out;
} else {
@@ -667,7 +688,7 @@ static int set_cmb(struct ccw_device *cdev, u32 mme)
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)
{
struct cmb *cmb;
u32 val;
@@ -717,7 +738,7 @@ out:
return ret;
}
-static int readall_cmb (struct ccw_device *cdev, struct cmbdata *data)
+static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data)
{
struct cmb *cmb;
struct cmb_data *cmb_data;
@@ -790,14 +811,25 @@ static struct cmb_operations cmbops_basic = {
.align = align_cmb,
.attr_group = &cmf_attr_group,
};
-
+
/* ******** extended cmb handling ********/
/**
* struct cmbe - extended channel measurement block
+ * @ssch_rsch_count: number of ssch and rsch
+ * @sample_count: number of samples
+ * @device_connect_time: time of device connect
+ * @function_pending_time: time of function pending
+ * @device_disconnect_time: time of device disconnect
+ * @control_unit_queuing_time: time of control unit queuing
+ * @device_active_only_time: time of device active only
+ * @device_busy_time: time of device busy
+ * @initial_command_response_time: initial command response time
+ * @reserved: unused
*
- * cmb as used by the hardware, may be in any 64 bit physical location,
- * the fields are described in z/Architecture Principles of Operation,
+ * The measurement block as used by the hardware. May be in any 64 bit physical
+ * location.
+ * The fields are described further in z/Architecture Principles of Operation,
* third edition, chapter 17.
*/
struct cmbe {
@@ -813,10 +845,12 @@ struct cmbe {
u32 reserved[7];
};
-/* kmalloc only guarantees 8 byte alignment, but we need cmbe
+/*
+ * 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)
+ * 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)) &
@@ -824,7 +858,7 @@ 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;
struct cmb_data *cmb_data;
@@ -870,7 +904,7 @@ out_free:
return ret;
}
-static void free_cmbe (struct ccw_device *cdev)
+static void free_cmbe(struct ccw_device *cdev)
{
struct cmb_data *cmb_data;
@@ -909,7 +943,7 @@ static int set_cmbe(struct ccw_device *cdev, u32 mme)
}
-static u64 read_cmbe (struct ccw_device *cdev, int index)
+static u64 read_cmbe(struct ccw_device *cdev, int index)
{
struct cmbe *cmb;
struct cmb_data *cmb_data;
@@ -967,7 +1001,7 @@ out:
return ret;
}
-static int readall_cmbe (struct ccw_device *cdev, struct cmbdata *data)
+static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data)
{
struct cmbe *cmb;
struct cmb_data *cmb_data;
@@ -1044,17 +1078,16 @@ static struct cmb_operations cmbops_extended = {
.align = align_cmbe,
.attr_group = &cmf_attr_group_ext,
};
-
-static ssize_t
-cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
+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)
+static ssize_t cmb_show_avg_sample_interval(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
struct ccw_device *cdev;
long interval;
@@ -1076,8 +1109,9 @@ cmb_show_avg_sample_interval(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "%ld\n", interval);
}
-static ssize_t
-cmb_show_avg_utilization(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t cmb_show_avg_utilization(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
struct cmbdata data;
u64 utilization;
@@ -1109,14 +1143,16 @@ cmb_show_avg_utilization(struct device *dev, struct device_attribute *attr, char
}
#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);
+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);
+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);
@@ -1128,7 +1164,8 @@ 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_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[] = {
@@ -1169,12 +1206,16 @@ static struct attribute_group cmf_attr_group_ext = {
.attrs = cmf_attributes_ext,
};
-static ssize_t cmb_enable_show(struct device *dev, struct device_attribute *attr, char *buf)
+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)
+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;
@@ -1199,9 +1240,16 @@ static ssize_t cmb_enable_store(struct device *dev, struct device_attribute *att
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)
+/**
+ * enable_cmf() - switch on the channel measurement for a specific device
+ * @cdev: The ccw device to be enabled
+ *
+ * Returns %0 for success or a negative error value.
+ *
+ * Context:
+ * non-atomic
+ */
+int enable_cmf(struct ccw_device *cdev)
{
int ret;
@@ -1222,8 +1270,16 @@ enable_cmf(struct ccw_device *cdev)
return ret;
}
-int
-disable_cmf(struct ccw_device *cdev)
+/**
+ * disable_cmf() - switch off the channel measurement for a specific device
+ * @cdev: The ccw device to be disabled
+ *
+ * Returns %0 for success or a negative error value.
+ *
+ * Context:
+ * non-atomic
+ */
+int disable_cmf(struct ccw_device *cdev)
{
int ret;
@@ -1235,14 +1291,32 @@ disable_cmf(struct ccw_device *cdev)
return ret;
}
-u64
-cmf_read(struct ccw_device *cdev, int index)
+/**
+ * cmf_read() - read one value from the current channel measurement block
+ * @cdev: the channel to be read
+ * @index: the index of the value to be read
+ *
+ * Returns the value read or %0 if the value cannot be read.
+ *
+ * Context:
+ * any
+ */
+u64 cmf_read(struct ccw_device *cdev, int index)
{
return cmbops->read(cdev, index);
}
-int
-cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
+/**
+ * cmf_readall() - read the current channel measurement block
+ * @cdev: the channel to be read
+ * @data: a pointer to a data block that will be filled
+ *
+ * Returns %0 on success, a negative error value otherwise.
+ *
+ * Context:
+ * any
+ */
+int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
{
return cmbops->readall(cdev, data);
}
@@ -1254,15 +1328,16 @@ int cmf_reenable(struct ccw_device *cdev)
return cmbops->set(cdev, 2);
}
-static int __init
-init_cmf(void)
+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 the user did not give a parameter, see if we are running on a
+ * machine supporting extended measurement blocks, otherwise fall back
+ * to basic mode.
+ */
if (format == CMF_AUTODETECT) {
if (!css_characteristics_avail ||
!css_general_characteristics.ext_mb) {
@@ -1279,16 +1354,9 @@ init_cmf(void)
case CMF_BASIC:
format_string = "basic";
cmbops = &cmbops_basic;
- if (cmb_area.num_channels > 4096 || cmb_area.num_channels < 1) {
- printk(KERN_ERR "cio: 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";
+ format_string = "extended";
cmbops = &cmbops_extended;
break;
default:
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 10:27:45 +0000