a96f1b9c48
Add support for reading the meter certificate from Intel On Demand hardware. The meter certificate [1] is used to access the utilization metrics of enabled features in support of the Intel On Demand consumption model. Similar to the state certificate, the meter certificate is read by mailbox command. While making similar changes also use the BIN_ATTR_ADMIN_RO helper to create the 'registers' sysfs file. Link: https://github.com/intel-sandbox/debox1.intel_sdsi/blob/gnr-review/meter-certificate.rst [1] Signed-off-by: David E. Box <david.e.box@linux.intel.com> Link: https://lore.kernel.org/r/20221119002343.1281885-5-david.e.box@linux.intel.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
3.5 KiB
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 On Demand (formerly Software Defined Silicon or 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 On Demand 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 On Demand 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 On Demand 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 On Demand NVRAM for the CPU. CAPs are used to activate a given CPU feature. A CAP is validated by On Demand 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/meter_certificate Date: Nov 2022 KernelVersion: 6.2 Contact: "David E. Box" david.e.box@linux.intel.com Description: (RO) Used to read back the current meter certificate for the CPU from Intel On Demand hardware. The meter certificate contains utilization metrics of On Demand enabled features. 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 On Demand hardware. The state certificate contains information about the current licenses on the CPU. Mailbox command.