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| author | Sam bobroff <sam.bobroff@au1.ibm.com> | 2014-05-21 08:32:39 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-28 05:35:40 +0200 |
| commit | 26c88f930141f0d9e7673af2332ada67b7e8865a (patch) | |
| tree | b4493946d83798a9fccabca88fdadedb6b7864b7 /Documentation/ABI | |
| parent | powerpc: Fix regression of per-CPU DSCR setting (diff) | |
| download | linux-26c88f930141f0d9e7673af2332ada67b7e8865a.tar.xz linux-26c88f930141f0d9e7673af2332ada67b7e8865a.zip | |
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>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-devices-system-cpu | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-devices-system-cpu b/Documentation/ABI/stable/sysfs-devices-system-cpu new file mode 100644 index 000000000000..33c133e2a631 --- /dev/null +++ b/Documentation/ABI/stable/sysfs-devices-system-cpu @@ -0,0 +1,25 @@ +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) |