mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
af190494f9
This patch enables support for OSPM suspend and resume in the MIC driver. During a host suspend event, the driver performs an orderly shutdown of the cards if they are online. Upon resume, any cards that were previously online before suspend are rebooted. The driver performs an orderly shutdown of the card primarily to ensure that applications in the card are terminated and mounted devices are safely un-mounted before the card is powered down in the event of an OSPM suspend. The driver makes use of the MIC daemon to accomplish OSPM suspend and resume. The driver registers a PM notifier per MIC device. The devices get notified synchronously during PM_SUSPEND_PREPARE and PM_POST_SUSPEND phases. During the PM_SUSPEND_PREPARE phase, the driver performs one of the following three tasks. 1) If the card is 'offline', the driver sets the card to a 'suspended' state and returns. 2) If the card is 'online', the driver initiates card shutdown by setting the card state to suspending. This notifies the MIC daemon which invokes shutdown and sets card state to 'suspended'. The driver returns after the shutdown is complete. 3) If the card is already being shutdown, possibly by a host user space application, the driver sets the card state to 'suspended' and returns after the shutdown is complete. During the PM_POST_SUSPEND phase, the driver simply notifies the daemon and returns. The daemon boots those cards that were previously online during the suspend phase. Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
6.1 KiB
Plaintext
158 lines
6.1 KiB
Plaintext
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:
|
|
"offline" - 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.
|
|
"online" - The MIC device has initiated booting a card OS.
|
|
"shutting_down" - The card OS is shutting down.
|
|
"reset_failed" - The MIC device has failed to reset.
|
|
"suspending" - The MIC device is currently being prepared for
|
|
suspend. On reading this entry, a "suspend" has to be written
|
|
to the state sysfs entry to ensure the card is shutdown during
|
|
OSPM suspend.
|
|
"suspended" - The MIC device has been suspended.
|
|
|
|
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.
|
|
"suspend" - Initiates card OS shutdown and also marks the card
|
|
as suspended.
|
|
|
|
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) elf - Boot an elf 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.
|