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An AFU may optionally contain one or more PCIe like configuration records, which can be used to identify the AFU. This patch adds support for exposing the raw config space and the vendor, device and class code under sysfs. These will appear in a subdirectory of the AFU device corresponding with the configuration record number, e.g. cat /sys/class/cxl/afu0.0/cr0/vendor 0x1014 cat /sys/class/cxl/afu0.0/cr0/device 0x4350 cat /sys/class/cxl/afu0.0/cr0/class 0x120000 hexdump -C /sys/class/cxl/afu0.0/cr0/config 00000000 14 10 50 43 00 00 00 00 06 00 00 12 00 00 00 00 |..PC............| 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000100 These files behave in much the same way as the equivalent files for PCI devices, with one exception being that the config file is currently read-only and restricted to the root user. It is not necessarily required to be this strict, but we currently do not have a compelling use-case to make it writable and/or world-readable, so I erred on the side of being restrictive. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
193 lines
7.6 KiB
Plaintext
193 lines
7.6 KiB
Plaintext
Note: Attributes that are shared between devices are stored in the directory
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pointed to by the symlink device/.
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Example: The real path of the attribute /sys/class/cxl/afu0.0s/irqs_max is
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/sys/class/cxl/afu0.0s/device/irqs_max, i.e. /sys/class/cxl/afu0.0/irqs_max.
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Slave contexts (eg. /sys/class/cxl/afu0.0s):
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What: /sys/class/cxl/<afu>/irqs_max
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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Decimal value of maximum number of interrupts that can be
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requested by userspace. The default on probe is the maximum
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that hardware can support (eg. 2037). Write values will limit
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userspace applications to that many userspace interrupts. Must
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be >= irqs_min.
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What: /sys/class/cxl/<afu>/irqs_min
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the minimum number of interrupts that
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userspace must request on a CXL_START_WORK ioctl. Userspace may
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omit the num_interrupts field in the START_WORK IOCTL to get
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this minimum automatically.
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What: /sys/class/cxl/<afu>/mmio_size
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the size of the MMIO space that may be mmaped
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by userspace.
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What: /sys/class/cxl/<afu>/modes_supported
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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List of the modes this AFU supports. One per line.
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Valid entries are: "dedicated_process" and "afu_directed"
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What: /sys/class/cxl/<afu>/mode
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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The current mode the AFU is using. Will be one of the modes
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given in modes_supported. Writing will change the mode
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provided that no user contexts are attached.
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What: /sys/class/cxl/<afu>/prefault_mode
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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Set the mode for prefaulting in segments into the segment table
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when performing the START_WORK ioctl. Possible values:
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none: No prefaulting (default)
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work_element_descriptor: Treat the work element
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descriptor as an effective address and
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prefault what it points to.
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all: all segments process calling START_WORK maps.
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What: /sys/class/cxl/<afu>/reset
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: write only
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Writing 1 here will reset the AFU provided there are not
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contexts active on the AFU.
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What: /sys/class/cxl/<afu>/api_version
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the current version of the kernel/user API.
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What: /sys/class/cxl/<afu>/api_version_compatible
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the the lowest version of the userspace API
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this this kernel supports.
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AFU configuration records (eg. /sys/class/cxl/afu0.0/cr0):
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An AFU may optionally export one or more PCIe like configuration records, known
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as AFU configuration records, which will show up here (if present).
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What: /sys/class/cxl/<afu>/cr<config num>/vendor
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Date: February 2015
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Hexadecimal value of the vendor ID found in this AFU
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configuration record.
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What: /sys/class/cxl/<afu>/cr<config num>/device
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Date: February 2015
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Hexadecimal value of the device ID found in this AFU
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configuration record.
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What: /sys/class/cxl/<afu>/cr<config num>/vendor
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Date: February 2015
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Hexadecimal value of the class code found in this AFU
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configuration record.
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What: /sys/class/cxl/<afu>/cr<config num>/config
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Date: February 2015
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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This binary file provides raw access to the AFU configuration
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record. The format is expected to match the either the standard
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or extended configuration space defined by the PCIe
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specification.
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Master contexts (eg. /sys/class/cxl/afu0.0m)
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What: /sys/class/cxl/<afu>m/mmio_size
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the size of the MMIO space that may be mmaped
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by userspace. This includes all slave contexts space also.
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What: /sys/class/cxl/<afu>m/pp_mmio_len
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the Per Process MMIO space length.
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What: /sys/class/cxl/<afu>m/pp_mmio_off
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Decimal value of the Per Process MMIO space offset.
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Card info (eg. /sys/class/cxl/card0)
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What: /sys/class/cxl/<card>/caia_version
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Identifies the CAIA Version the card implements.
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What: /sys/class/cxl/<card>/psl_revision
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Identifies the revision level of the PSL.
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What: /sys/class/cxl/<card>/base_image
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Identifies the revision level of the base image for devices
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that support loadable PSLs. For FPGAs this field identifies
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the image contained in the on-adapter flash which is loaded
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during the initial program load.
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What: /sys/class/cxl/<card>/image_loaded
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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Will return "user" or "factory" depending on the image loaded
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onto the card.
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What: /sys/class/cxl/<card>/load_image_on_perst
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Date: December 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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Valid entries are "none", "user", and "factory".
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"none" means PERST will not cause image to be loaded to the
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card. A power cycle is required to load the image.
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"none" could be useful for debugging because the trace arrays
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are preserved.
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"user" and "factory" means PERST will cause either the user or
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user or factory image to be loaded.
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Default is to reload on PERST whichever image the card has
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loaded.
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What: /sys/class/cxl/<card>/reset
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Date: October 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: write only
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Writing 1 will issue a PERST to card which may cause the card
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to reload the FPGA depending on load_image_on_perst.
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