xref: /kernel/linux/linux-5.10/Documentation/ABI/testing/sysfs-class-mic (revision 8c2ecf20)

What:		/sys/class/mic/
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		The mic class directory belongs to Intel MIC devices and
		provides information per MIC device. An Intel MIC device is a
		PCIe form factor add-in Coprocessor card based on the Intel Many
		Integrated Core (MIC) architecture that runs a Linux OS.

What:		/sys/class/mic/mic(x)
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		The directories /sys/class/mic/mic0, /sys/class/mic/mic1 etc.,
		represent MIC devices (0,1,..etc). Each directory has
		information specific to that MIC device.

What:		/sys/class/mic/mic(x)/family
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		Provides information about the Coprocessor family for an Intel
		MIC device. For example - "x100"

What:		/sys/class/mic/mic(x)/stepping
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		Provides information about the silicon stepping for an Intel
		MIC device. For example - "A0" or "B0"

What:		/sys/class/mic/mic(x)/state
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		When read, this entry provides the current state of an Intel
		MIC device in the context of the card OS. Possible values that
		will be read are:


		===============  ===============================================
		"ready"		 The MIC device is ready to boot the card OS.
				 On reading this entry after an OSPM resume,
				 a "boot" has to be written to this entry if
				 the card was previously shutdown during OSPM
				 suspend.
		"booting"	 The MIC device has initiated booting a card OS.
		"online"	 The MIC device has completed boot and is online
		"shutting_down"	 The card OS is shutting down.
		"resetting"	 A reset has been initiated for the MIC device
		"reset_failed"	 The MIC device has failed to reset.
		===============  ===============================================

		When written, this sysfs entry triggers different state change
		operations depending upon the current state of the card OS.
		Acceptable values are:


		==========  ===================================================
		"boot"      Boot the card OS image specified by the combination
			    of firmware, ramdisk, cmdline and bootmode
			    sysfs entries.
		"reset"     Initiates device reset.
		"shutdown"  Initiates card OS shutdown.
		==========  ===================================================

What:		/sys/class/mic/mic(x)/shutdown_status
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		An Intel MIC device runs a Linux OS during its operation. This
		OS can shutdown because of various reasons. When read, this
		entry provides the status on why the card OS was shutdown.
		Possible values are:

		==========  ===================================================
		"nop"       shutdown status is not applicable, when the card OS
			    is "online"
		"crashed"   Shutdown because of a HW or SW crash.
		"halted"    Shutdown because of a halt command.
		"poweroff"  Shutdown because of a poweroff command.
		"restart"   Shutdown because of a restart command.
		==========  ===================================================

What:		/sys/class/mic/mic(x)/cmdline
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		An Intel MIC device runs a Linux OS during its operation. Before
		booting this card OS, it is possible to pass kernel command line
		options to configure various features in it, similar to
		self-bootable machines. When read, this entry provides
		information about the current kernel command line options set to
		boot the card OS. This entry can be written to change the
		existing kernel command line options. Typically, the user would
		want to read the current command line options, append new ones
		or modify existing ones and then write the whole kernel command
		line back to this entry.

What:		/sys/class/mic/mic(x)/firmware
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		When read, this sysfs entry provides the path name under
		/lib/firmware/ where the firmware image to be booted on the
		card can be found. The entry can be written to change the
		firmware image location under /lib/firmware/.

What:		/sys/class/mic/mic(x)/ramdisk
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		When read, this sysfs entry provides the path name under
		/lib/firmware/ where the ramdisk image to be used during card
		OS boot can be found. The entry can be written to change
		the ramdisk image location under /lib/firmware/.

What:		/sys/class/mic/mic(x)/bootmode
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		When read, this sysfs entry provides the current bootmode for
		the card. This sysfs entry can be written with the following
		valid strings:
		a) linux - Boot a Linux image.
		b) flash - Boot an image for flash updates.

What:		/sys/class/mic/mic(x)/log_buf_addr
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		An Intel MIC device runs a Linux OS during its operation. For
		debugging purpose and early kernel boot messages, the user can
		access the card OS log buffer via debugfs. When read, this entry
		provides the kernel virtual address of the buffer where the card
		OS log buffer can be read. This entry is written by the host
		configuration daemon to set the log buffer address. The correct
		log buffer address to be written can be found in the System.map
		file of the card OS.

What:		/sys/class/mic/mic(x)/log_buf_len
Date:		October 2013
KernelVersion:	3.13
Contact:	Sudeep Dutt <sudeep.dutt@intel.com>
Description:
		An Intel MIC device runs a Linux OS during its operation. For
		debugging purpose and early kernel boot messages, the user can
		access the card OS log buffer via debugfs. When read, this entry
		provides the kernel virtual address where the card OS log buffer
		length can be read. This entry is written by host configuration
		daemon to set the log buffer length address. The correct log
		buffer length address to be written can be found in the
		System.map file of the card OS.

What:		/sys/class/mic/mic(x)/heartbeat_enable
Date:		March 2015
KernelVersion:	4.4
Contact:	Ashutosh Dixit <ashutosh.dixit@intel.com>
Description:
		The MIC drivers detect and inform user space about card crashes
		via a heartbeat mechanism (see the description of
		shutdown_status above). User space can turn off this
		notification by setting heartbeat_enable to 0 and enable it by
		setting this entry to 1. If this notification is disabled it is
		the responsibility of user space to detect card crashes via
		alternative means such as a network ping. This setting is
		enabled by default.