intel_reg - Man Page

intel_reg [Options] COMMAND

Intel graphics register multitool. Read, write, dump, and decode Intel graphics MMIO and sideband registers, and more.

Some options are global, and some specific to commands.

--verbose

Increase verbosity.

--quiet

Decrease verbosity.

--count=N

Read N registers.

--binary

Output binary values.

--all

Decode registers for all known platforms.

--mmio=FILE

Use MMIO bar from FILE.

--devid=DEVID

Pretend to be PCI ID DEVID. Useful with MMIO bar snapshots from other machines.

--spec=PATH

Read register spec from directory or file specified by PATH; see Register Spec Definitions below for details.

--help

Show brief help.

See Register References below on how to describe registers for the commands.

Registers are defined as [(PORTNAME|PORTNUM|ENGINE|MMIO-OFFSET):](REGNAME|REGADDR).

PORTNAME

The register access method, most often MMIO, which is the default. The methods supported on all platforms are "mmio", "portio-vga", and "mmio-vga".

On BYT and CHV, the sideband ports "bunit", "punit", "nc", "dpio", "gpio-nc", "cck", "ccu", "dpio2", and "flisdsi" are also supported.

PORTNUM

Port number for the sideband ports supported on BYT and CHV. Only numbers mapped to the supported ports are allowed, arbitrary numbers are not accepted.

Numbers above 0xff are automatically interpreted as MMIO offsets, not port numbers.

ENGINE

Instead of cpu based MMIO, specified engine can be used for access method. Batchbuffer will be targeted for the engine to do read/write. The list of available engines is architecture specific and can be found with "intel_reg help". Prefixing engine name with '-' uses non-privileged batchbuffer for access.

MMIO-OFFSET

Use MMIO, and add this offset to the register address.

Numbers equal to or below 0xff are automatically interpreted as port numbers, not MMIO offsets.

REGNAME

Name of the register as defined in the register spec.

If MMIO offset is not specified, it is picked up from the register spec. However, ports are not; the port is a namespace for the register names.

REGADDR

Register address. The corresponding register name need not be specified in the register spec.

INTEL_REG_SPEC

Path to a directory or a file containing register spec definitions.

A register spec associates register names with addresses. The spec is searched for in this order:

1. Directory or file specified by the --spec option.
2. Directory or file specified by the INTEL_REG_SPEC environment variable.
3. Builtin register spec. Also used as fallback with a warning if the above are used but fail.

If a directory is specified using --spec option or INTEL_REG_SPEC environment variable, the directory is scanned for a spec file in this order:

1. File named after the PCI device id. For example, "0412".
2. File named after the code name in lowercase, without punctuation. For example, "valleyview".
3. File named after generation. For example, "gen7" (note that this matches valleyview, ivybridge and haswell!).

Reading some registers may hang the GPU or the machine.

Report bugs on fd.o GitLab: https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/issues

Jani Nikula <jani.nikula@intel.com>

2015-2016 Intel Corporation