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-rw-r--r--Documentation/s390/driver-model.txt21
1 files changed, 12 insertions, 9 deletions
diff --git a/Documentation/s390/driver-model.txt b/Documentation/s390/driver-model.txt
index 19461958e2bd..df09758bf3fe 100644
--- a/Documentation/s390/driver-model.txt
+++ b/Documentation/s390/driver-model.txt
@@ -8,11 +8,10 @@ All devices which can be addressed by means of ccws are called 'CCW devices' -
8even if they aren't actually driven by ccws. 8even if they aren't actually driven by ccws.
9 9
10All ccw devices are accessed via a subchannel, this is reflected in the 10All ccw devices are accessed via a subchannel, this is reflected in the
11structures under root/: 11structures under devices/:
12 12
13root/ 13devices/
14 - sys 14 - system/
15 - legacy
16 - css0/ 15 - css0/
17 - 0.0.0000/0.0.0815/ 16 - 0.0.0000/0.0.0815/
18 - 0.0.0001/0.0.4711/ 17 - 0.0.0001/0.0.4711/
@@ -36,7 +35,7 @@ availability: Can be 'good' or 'boxed'; 'no path' or 'no device' for
36 35
37online: An interface to set the device online and offline. 36online: An interface to set the device online and offline.
38 In the special case of the device being disconnected (see the 37 In the special case of the device being disconnected (see the
39 notify function under 1.2), piping 0 to online will focibly delete 38 notify function under 1.2), piping 0 to online will forcibly delete
40 the device. 39 the device.
41 40
42The device drivers can add entries to export per-device data and interfaces. 41The device drivers can add entries to export per-device data and interfaces.
@@ -222,7 +221,7 @@ and are called 'chp0.<chpid>'. They have no driver and do not belong to any bus.
222Please note, that unlike /proc/chpids in 2.4, the channel path objects reflect 221Please note, that unlike /proc/chpids in 2.4, the channel path objects reflect
223only the logical state and not the physical state, since we cannot track the 222only the logical state and not the physical state, since we cannot track the
224latter consistently due to lacking machine support (we don't need to be aware 223latter consistently due to lacking machine support (we don't need to be aware
225of anyway). 224of it anyway).
226 225
227status - Can be 'online' or 'offline'. 226status - Can be 'online' or 'offline'.
228 Piping 'on' or 'off' sets the chpid logically online/offline. 227 Piping 'on' or 'off' sets the chpid logically online/offline.
@@ -235,12 +234,16 @@ status - Can be 'online' or 'offline'.
2353. System devices 2343. System devices
236----------------- 235-----------------
237 236
238Note: cpus may yet be added here.
239
2403.1 xpram 2373.1 xpram
241--------- 238---------
242 239
243xpram shows up under sys/ as 'xpram'. 240xpram shows up under devices/system/ as 'xpram'.
241
2423.2 cpus
243--------
244
245For each cpu, a directory is created under devices/system/cpu/. Each cpu has an
246attribute 'online' which can be 0 or 1.
244 247
245 248
2464. Other devices 2494. Other devices