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authorCornelia Huck <cohuck@de.ibm.com>2005-05-01 08:59:00 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:59:00 -0700
commit9fc1427a01a9df3605e219c6de0c59c4639209a1 (patch)
tree1b8b5f3644bd5e2288bc35df1b83e9b1904cd945 /Documentation/s390
parentaf6c8eed14a0c14791e2fbb4c7726755c1a637ca (diff)
[PATCH] s390: cio documentation
Synchronize documentation with current interface. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/s390')
-rw-r--r--Documentation/s390/cds.txt45
1 files changed, 41 insertions, 4 deletions
diff --git a/Documentation/s390/cds.txt b/Documentation/s390/cds.txt
index d9397170fb36..f0be389c7116 100644
--- a/Documentation/s390/cds.txt
+++ b/Documentation/s390/cds.txt
@@ -56,12 +56,16 @@ read_dev_chars()
read device characteristics
read_conf_data()
+read_conf_data_lpm()
read configuration data.
ccw_device_get_ciw()
get commands from extended sense data.
ccw_device_start()
+ccw_device_start_timeout()
+ccw_device_start_key()
+ccw_device_start_key_timeout()
initiate an I/O request.
ccw_device_resume()
@@ -197,19 +201,21 @@ The read_dev_chars() function returns :
operational.
-read_conf_data() - Read Configuration Data
+read_conf_data(), read_conf_data_lpm() - Read Configuration Data
Retrieve the device dependent configuration data. Please have a look at your
device dependent I/O commands for the device specific layout of the node
-descriptor elements.
+descriptor elements. read_conf_data_lpm() will retrieve the configuration data
+for a specific path.
-The function is meant to be called with an irq handler in place; that is,
+The function is meant to be called with the device already enabled; that is,
at earliest during set_online() processing.
The function may be called enabled or disabled, but the device must not be
locked
-int read_conf_data(struct ccw_device, void **buffer, int *length, __u8 lpm);
+int read_conf_data(struct ccw_device, void **buffer, int *length);
+int read_conf_data_lpm(struct ccw_device, void **buffer, int *length, __u8 lpm);
cdev - the ccw_device the data is requested for.
buffer - Pointer to a buffer pointer. The read_conf_data() routine
@@ -263,6 +269,25 @@ int ccw_device_start(struct ccw_device *cdev,
unsigned long intparm,
__u8 lpm,
unsigned long flags);
+int ccw_device_start_timeout(struct ccw_device *cdev,
+ struct ccw1 *cpa,
+ unsigned long intparm,
+ __u8 lpm,
+ unsigned long flags,
+ int expires);
+int ccw_device_start_key(struct ccw_device *cdev,
+ struct ccw1 *cpa,
+ unsigned long intparm,
+ __u8 lpm,
+ __u8 key,
+ unsigned long flags);
+int ccw_device_start_key_timeout(struct ccw_device *cdev,
+ struct ccw1 *cpa,
+ unsigned long intparm,
+ __u8 lpm,
+ __u8 key,
+ unsigned long flags,
+ int expires);
cdev : ccw_device the I/O is destined for
cpa : logical start address of channel program
@@ -272,7 +297,12 @@ user_intparm : user specific interrupt information; will be presented
particular I/O request.
lpm : defines the channel path to be used for a specific I/O
request. A value of 0 will make cio use the opm.
+key : the storage key to use for the I/O (useful for operating on a
+ storage with a storage key != default key)
flag : defines the action to be performed for I/O processing
+expires : timeout value in jiffies. The common I/O layer will terminate
+ the running program after this and call the interrupt handler
+ with ERR_PTR(-ETIMEDOUT) as irb.
Possible flag values are :
@@ -327,6 +357,13 @@ current (last) I/O request. In case of a delayed status notification no special
interrupt will be presented to indicate I/O completion as the I/O request was
never started, even though ccw_device_start() returned with successful completion.
+The irb may contain an error value, and the device driver should check for this
+first:
+
+-ETIMEDOUT: the common I/O layer terminated the request after the specified
+ timeout value
+-EIO: the common I/O layer terminated the request due to an error state
+
If the concurrent sense flag in the extended status word in the irb is set, the
field irb->scsw.count describes the numer of device specific sense bytes
available in the extended control word irb->scsw.ecw[0]. No device sensing by

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