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| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-intel_sdsi | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-intel_sdsi b/Documentation/ABI/testing/sysfs-driver-intel_sdsi new file mode 100644 index 000000000..96b92c105 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel_sdsi @@ -0,0 +1,79 @@ +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + This directory contains interface files for accessing Intel + Software Defined Silicon (SDSi) features on a CPU. X + represents the socket instance (though not the socket ID). + The socket ID is determined by reading the registers file + and decoding it per the specification. + + Some files communicate with SDSi hardware through a mailbox. + Should the operation fail, one of the following error codes + may be returned: + + ========== ===== + Error Code Cause + ========== ===== + EIO General mailbox failure. Log may indicate cause. + EBUSY Mailbox is owned by another agent. + EPERM SDSI capability is not enabled in hardware. + EPROTO Failure in mailbox protocol detected by driver. + See log for details. + EOVERFLOW For provision commands, the size of the data + exceeds what may be written. + ESPIPE Seeking is not allowed. + ETIMEDOUT Failure to complete mailbox transaction in time. + ========== ===== + +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/guid +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + (RO) The GUID for the registers file. The GUID identifies + the layout of the registers file in this directory. + Information about the register layouts for a particular GUID + is available at http://github.com/intel/intel-sdsi + +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/registers +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + (RO) Contains information needed by applications to provision + a CPU and monitor status information. The layout of this file + is determined by the GUID in this directory. Information about + the layout for a particular GUID is available at + http://github.com/intel/intel-sdsi + +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_akc +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + (WO) Used to write an Authentication Key Certificate (AKC) to + the SDSi NVRAM for the CPU. The AKC is used to authenticate a + Capability Activation Payload. Mailbox command. + +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_cap +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + (WO) Used to write a Capability Activation Payload (CAP) to the + SDSi NVRAM for the CPU. CAPs are used to activate a given CPU + feature. A CAP is validated by SDSi hardware using a previously + provisioned AKC file. Upon successful authentication, the CPU + configuration is updated. A cold reboot is required to fully + activate the feature. Mailbox command. + +What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/state_certificate +Date: Feb 2022 +KernelVersion: 5.18 +Contact: "David E. Box" <david.e.box@linux.intel.com> +Description: + (RO) Used to read back the current State Certificate for the CPU + from SDSi hardware. The State Certificate contains information + about the current licenses on the CPU. Mailbox command. |