* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/bootmem.h>
#include <linux/device.h>
#include <linux/init.h>
* 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)
* 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
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;
if (count == 0)
return 0;
- /* value comes in units of 128 µsec */
+ /* value comes in units of 128 µsec */
ret = time_to_nsec(value);
do_div(ret, count);
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->schid, 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->schid, 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- case 3: /* subchannel is no longer valid */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->schid, schib); /* restore the schib */
- if (ret)
- break;
+ sch->config.mme = mme;
+ sch->config.mbfc = mbfc;
+ /* address can be either a block address or a block index */
+ if (mbfc)
+ sch->config.mba = address;
+ else
+ sch->config.mbi = address;
- /* 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;
+ return cio_commit_config(sch);
}
struct set_schib_struct {
sch = to_subchannel(cdev->dev.parent);
- if (stsch(sch->schid, &sch->schib))
+ if (cio_update_schib(sch))
return -ENODEV;
- if (sch->schib.scsw.fctl & SCSW_FCTL_START_FUNC) {
+ if (scsw_fctl(&sch->schib.scsw) & 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 &
+ if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) &&
+ (scsw_actl(&sch->schib.scsw) &
(SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
- (!sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS))
+ (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS)))
return -EBUSY;
}
cmb_data = cdev->private->cmb;
*
* @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 {
.num_channels = 1024,
};
-\f
/* ****** old style CMB handling ********/
/*
* 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.
+ * a reasonable value of 1024, or 32 kb of memory.
* Current kernels don't allow kmalloc with more than 128kb, so the
* maximum is 4096.
*/
/**
* 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
+ *
+ * The measurement block as used by the hardware. The fields are described
+ * further in z/Architecture Principles of Operation, chapter 17.
*
- * 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 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 {
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 {
.align = align_cmb,
.attr_group = &cmf_attr_group,
};
-\f
+
/* ******** 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 {
.align = align_cmbe,
.attr_group = &cmf_attr_group_ext,
};
-\f
static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
{
{
struct ccw_device *cdev;
int ret;
+ unsigned long val;
+
+ ret = strict_strtoul(buf, 16, &val);
+ if (ret)
+ return ret;
cdev = to_ccwdev(dev);
- switch (buf[0]) {
- case '0':
+ switch (val) {
+ case 0:
ret = disable_cmf(cdev);
- if (ret)
- dev_info(&cdev->dev, "disable_cmf failed (%d)\n", ret);
break;
- case '1':
+ case 1:
ret = enable_cmf(cdev);
- if (ret && ret != -EBUSY)
- dev_info(&cdev->dev, "enable_cmf failed (%d)\n", ret);
break;
}
DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
-/* enable_cmf/disable_cmf: module interface for cmf (de)activation */
+int ccw_set_cmf(struct ccw_device *cdev, int enable)
+{
+ return cmbops->set(cdev, enable ? 2 : 0);
+}
+
+/**
+ * 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;
return ret;
}
+/**
+ * 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;
return ret;
}
+/**
+ * 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);
}
+/**
+ * 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);
* to basic mode.
*/
if (format == CMF_AUTODETECT) {
- if (!css_characteristics_avail ||
- !css_general_characteristics.ext_mb) {
+ if (!css_general_characteristics.ext_mb) {
format = CMF_BASIC;
} else {
format = CMF_EXTENDED;
cmbops = &cmbops_extended;
break;
default:
- printk(KERN_ERR "cio: Invalid format %d for channel "
- "measurement facility\n", format);
return 1;
}
-
- printk(KERN_INFO "cio: Channel measurement facility using %s "
- "format (%s)\n", format_string, detect_string);
+ pr_info("Channel measurement facility initialized using format "
+ "%s (mode %s)\n", format_string, detect_string);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff