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Note: Attributes that are shared between devices are stored in the directory
pointed to by the symlink device/.
Example: The real path of the attribute /sys/class/cxl/afu0.0s/irqs_max is
/sys/class/cxl/afu0.0s/device/irqs_max, i.e. /sys/class/cxl/afu0.0/irqs_max.
Slave contexts (eg. /sys/class/cxl/afu0.0s):
What: /sys/class/cxl/<afu>/afu_err_buf
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
AFU Error Buffer contents. The contents of this file are
application specific and depends on the AFU being used.
Applications interacting with the AFU can use this attribute
to know about the current error condition and take appropriate
action like logging the event etc.
What: /sys/class/cxl/<afu>/irqs_max
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
Decimal value of maximum number of interrupts that can be
requested by userspace. The default on probe is the maximum
that hardware can support (eg. 2037). Write values will limit
userspace applications to that many userspace interrupts. Must
be >= irqs_min.
What: /sys/class/cxl/<afu>/irqs_min
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the minimum number of interrupts that
userspace must request on a CXL_START_WORK ioctl. Userspace may
omit the num_interrupts field in the START_WORK IOCTL to get
this minimum automatically.
What: /sys/class/cxl/<afu>/mmio_size
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the size of the MMIO space that may be mmaped
by userspace.
What: /sys/class/cxl/<afu>/modes_supported
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
List of the modes this AFU supports. One per line.
Valid entries are: "dedicated_process" and "afu_directed"
What: /sys/class/cxl/<afu>/mode
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
The current mode the AFU is using. Will be one of the modes
given in modes_supported. Writing will change the mode
provided that no user contexts are attached.
What: /sys/class/cxl/<afu>/prefault_mode
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
Set the mode for prefaulting in segments into the segment table
when performing the START_WORK ioctl. Possible values:
none: No prefaulting (default)
work_element_descriptor: Treat the work element
descriptor as an effective address and
prefault what it points to.
all: all segments process calling START_WORK maps.
What: /sys/class/cxl/<afu>/reset
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: write only
Writing 1 here will reset the AFU provided there are not
contexts active on the AFU.
What: /sys/class/cxl/<afu>/api_version
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the current version of the kernel/user API.
What: /sys/class/cxl/<afu>/api_version_compatible
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the the lowest version of the userspace API
this this kernel supports.
AFU configuration records (eg. /sys/class/cxl/afu0.0/cr0):
An AFU may optionally export one or more PCIe like configuration records, known
as AFU configuration records, which will show up here (if present).
What: /sys/class/cxl/<afu>/cr<config num>/vendor
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the vendor ID found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/device
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the device ID found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/class
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the class code found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/config
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
This binary file provides raw access to the AFU configuration
record. The format is expected to match the either the standard
or extended configuration space defined by the PCIe
specification.
Master contexts (eg. /sys/class/cxl/afu0.0m)
What: /sys/class/cxl/<afu>m/mmio_size
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the size of the MMIO space that may be mmaped
by userspace. This includes all slave contexts space also.
What: /sys/class/cxl/<afu>m/pp_mmio_len
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the Per Process MMIO space length.
What: /sys/class/cxl/<afu>m/pp_mmio_off
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Decimal value of the Per Process MMIO space offset.
Card info (eg. /sys/class/cxl/card0)
What: /sys/class/cxl/<card>/caia_version
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Identifies the CAIA Version the card implements.
What: /sys/class/cxl/<card>/psl_revision
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Identifies the revision level of the PSL.
What: /sys/class/cxl/<card>/base_image
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Identifies the revision level of the base image for devices
that support loadable PSLs. For FPGAs this field identifies
the image contained in the on-adapter flash which is loaded
during the initial program load.
What: /sys/class/cxl/<card>/image_loaded
Date: September 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Will return "user" or "factory" depending on the image loaded
onto the card.
What: /sys/class/cxl/<card>/load_image_on_perst
Date: December 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: read/write
Valid entries are "none", "user", and "factory".
"none" means PERST will not cause image to be loaded to the
card. A power cycle is required to load the image.
"none" could be useful for debugging because the trace arrays
are preserved.
"user" and "factory" means PERST will cause either the user or
user or factory image to be loaded.
Default is to reload on PERST whichever image the card has
loaded.
What: /sys/class/cxl/<card>/reset
Date: October 2014
Contact: linuxppc-dev@lists.ozlabs.org
Description: write only
Writing 1 will issue a PERST to card which may cause the card
to reload the FPGA depending on load_image_on_perst.
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