diff options
| author | Iwona Winiarska <iwona.winiarska@intel.com> | 2022-02-08 16:36:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-09 08:04:44 +0100 |
| commit | 42bed52b2e9cda0d5e2de50f10478c0bcedcdb95 (patch) | |
| tree | 760f1e4540b51352365516cbba1909a44885c73b /Documentation | |
| parent | 52857e6828e260b16ac569578705f83cf2a71ac1 (diff) | |
| download | linux-42bed52b2e9cda0d5e2de50f10478c0bcedcdb95.tar.bz2 | |
peci: Add sysfs interface for PECI bus
PECI devices may not be discoverable at the time when PECI controller is
being added (e.g. BMC can boot up when the Host system is still in S5).
Since we currently don't have the capabilities to figure out the Host
system state inside the PECI subsystem itself, we have to rely on
userspace to do it for us.
In the future, PECI subsystem may be expanded with mechanisms that allow
us to avoid depending on userspace interaction (e.g. CPU presence could
be detected using GPIO, and the information on whether it's discoverable
could be obtained over IPMI).
Unfortunately, those methods may ultimately not be available (support
will vary from platform to platform), which means that we still need
platform independent method triggered by userspace.
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com>
Link: https://lore.kernel.org/r/20220208153639.255278-8-iwona.winiarska@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-peci | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-peci b/Documentation/ABI/testing/sysfs-bus-peci new file mode 100644 index 000000000000..87454ec5d981 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-peci @@ -0,0 +1,16 @@ +What: /sys/bus/peci/rescan +Date: July 2021 +KernelVersion: 5.18 +Contact: Iwona Winiarska <iwona.winiarska@intel.com> +Description: + Writing a non-zero value to this attribute will + initiate scan for PECI devices on all PECI controllers + in the system. + +What: /sys/bus/peci/devices/<controller_id>-<device_addr>/remove +Date: July 2021 +KernelVersion: 5.18 +Contact: Iwona Winiarska <iwona.winiarska@intel.com> +Description: + Writing a non-zero value to this attribute will + remove the PECI device and any of its children. |