NAME

       intel_reg - Intel graphics register multitool

SYNOPSIS

       intel_reg [OPTIONS] COMMAND

DESCRIPTION

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

OPTIONS

       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.

COMMANDS

       See REGISTER REFERENCES below on how to describe registers for the commands.

   read [--count=N] REGISTER [...]
       Dump each specified REGISTER, or N registers starting from each REGISTER.

   write REGISTER VALUE [REGISTER VALUE ...]
       Write each VALUE to corresponding REGISTER.

   dump [--mmio=FILE --devid=DEVID]
       Dump all registers specified in the register spec.

   decode REGISTER VALUE
       Decode REGISTER VALUE.

   snapshot
       Output  the  MMIO  bar to stdout. The output can be used for a later invocation of dump or
       read with the --mmio=FILE and --devid=DEVID parameters.

   list
       List the known registers.

   help
       Display brief help.

REGISTER REFERENCES

       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.

ENVIRONMENT

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

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!).

   Register Spec File Format
       The register spec format is briefly described below:

       • Empty lines and lines beginning with "#", ";", or "//" are ignored.

       • Lines not beginning with "(" are interpreted as file names, absolute or relative, to  be
         included.

       • Lines beginning with "(" are interpreted as register definitions.

       Registers are defined as tuples ('REGNAME', 'REGADDR', 'PORTNAME|PORTNUM|MMIO-OFFSET'), as
       in REGISTER REFERENCES above. The port description may also be an empty string  to  denote
       MMIO.

       Examples:

       • # this is a comment, below is an include

       • vlv_pipe_a.txt

       • ('GEN6_PMINTRMSK', '0x0000a168', '')

       • ('MIPIA_PORT_CTRL', '0x61190', '0x180000')

       • ('PLL1_DW0', '0x8000', 'DPIO')

BUGS

       Reading some registers may hang the GPU or the machine.

REPORTING BUGS

       Report bugs to https://bugs.freedesktop.org.

AUTHOR

       Jani Nikula <jani.nikula@intel.com>

COPYRIGHT

       2015-2016 Intel Corporation