vserver 2.0 rc7

[linux-2.6.git] / Documentation / s390 / cds.txt

diff --git a/Documentation/s390/cds.txt b/Documentation/s390/cds.txt
index d939717..f0be389 100644 (file)
--- 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