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authorSam bobroff <sam.bobroff@au1.ibm.com>2014-05-21 10:32:39 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-05-28 07:35:40 +0400
commit26c88f930141f0d9e7673af2332ada67b7e8865a (patch)
treeb4493946d83798a9fccabca88fdadedb6b7864b7 /Documentation/ABI/stable/sysfs-devices-system-cpu
parent1739ea9e13e636590dd56c2f4ca85e783da512e7 (diff)
downloadlinux-26c88f930141f0d9e7673af2332ada67b7e8865a.tar.xz
powerpc: Document sysfs DSCR interface
Add some documentation about ... /sys/devices/system/cpu/dscr_default /sys/devices/system/cpu/cpuN/dscr ... to Documentation/ABI/stable. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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+What: /sys/devices/system/cpu/dscr_default
+Date: 13-May-2014
+KernelVersion: v3.15.0
+Contact:
+Description: Writes are equivalent to writing to
+ /sys/devices/system/cpu/cpuN/dscr on all CPUs.
+ Reads return the last written value or 0.
+ This value is not a global default: it is a way to set
+ all per-CPU defaults at the same time.
+Values: 64 bit unsigned integer (bit field)
+
+What: /sys/devices/system/cpu/cpu[0-9]+/dscr
+Date: 13-May-2014
+KernelVersion: v3.15.0
+Contact:
+Description: Default value for the Data Stream Control Register (DSCR) on
+ a CPU.
+ This default value is used when the kernel is executing and
+ for any process that has not set the DSCR itself.
+ If a process ever sets the DSCR (via direct access to the
+ SPR) that value will be persisted for that process and used
+ on any CPU where it executes (overriding the value described
+ here).
+ If set by a process it will be inherited by child processes.
+Values: 64 bit unsigned integer (bit field)